US20100026662A1 - Liquid Crystal Display - Google Patents

Liquid Crystal Display Download PDF

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Publication number
US20100026662A1
US20100026662A1 US12/511,151 US51115109A US2010026662A1 US 20100026662 A1 US20100026662 A1 US 20100026662A1 US 51115109 A US51115109 A US 51115109A US 2010026662 A1 US2010026662 A1 US 2010026662A1
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US
United States
Prior art keywords
liquid crystal
substrate
touch panel
adhered
crystal display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/511,151
Inventor
Eiji Oohira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Liquid Crystal Display Co Ltd
Japan Display Inc
Original Assignee
Hitachi Displays Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Displays Ltd filed Critical Hitachi Displays Ltd
Assigned to HITACHI DISPLAYS, LTD. reassignment HITACHI DISPLAYS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Oohira, Eiji
Publication of US20100026662A1 publication Critical patent/US20100026662A1/en
Assigned to PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. reassignment PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: IPS ALPHA SUPPORT CO., LTD.
Assigned to IPS ALPHA SUPPORT CO., LTD. reassignment IPS ALPHA SUPPORT CO., LTD. COMPANY SPLIT PLAN TRANSFERRING FIFTY (50) PERCENT SHARE IN PATENT APPLICATIONS Assignors: HITACHI DISPLAYS, LTD.
Priority to US13/603,847 priority Critical patent/US9035893B2/en
Priority to US14/687,719 priority patent/US9423904B2/en
Assigned to JAPAN DISPLAY INC. reassignment JAPAN DISPLAY INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: JAPAN DISPLAY EAST INC.
Assigned to JAPAN DISPLAY EAST INC. reassignment JAPAN DISPLAY EAST INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI DISPLAYS, LTD.
Priority to US15/212,395 priority patent/US9606391B2/en
Priority to US15/428,546 priority patent/US9921424B2/en
Priority to US15/879,550 priority patent/US10228581B2/en
Priority to US16/255,969 priority patent/US10459274B2/en
Priority to US16/574,228 priority patent/US10788698B2/en
Priority to US17/001,748 priority patent/US11143899B2/en
Priority to US17/467,599 priority patent/US11422399B2/en
Abandoned legal-status Critical Current

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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G—PHYSICS
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    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
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    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
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    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/13332—Front frames
    • G—PHYSICS
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
    • G—PHYSICS
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
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    • G—PHYSICS
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    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
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    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor

Definitions

  • the present invention relates to a liquid crystal display.
  • a portable device which adopts a liquid crystal display formed by stacking a liquid crystal panel, a touch panel and a front window.
  • a liquid crystal display has the structure in which the liquid crystal panel and the touch panel are adhered to each other using an adhesive material, and the touch panel and the front window are adhered to each other using an adhesive material (hereinafter referred to as three-layered hybrid structure)
  • three-layered hybrid structure the constitution of a mobile-phone-use liquid crystal display module which constitutes one example of a liquid crystal display of the related art having the three-layered hybrid structure is explained in conjunction with FIG. 5 to FIG. 12 .
  • FIG. 5 is a view showing a mobile-phone-use liquid crystal display module of the related art in a state where a polarizer 1 is exposed (a state before a touch panel 7 and a front window 9 are adhered to each other).
  • FIG. 6 is a view showing a state in which the touch panel 7 is adhered to the polarizer 1 shown in FIG. 5 (a state before the front window 9 is adhered).
  • FIG. 7 is a top plan view of the mobile-phone-use liquid crystal display module shown in FIG. 6 which has the three-layered hybrid structure in which the front window 9 is further adhered to the touch panel 7 .
  • FIG. 8 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line VIII-VIII.
  • FIG. 9 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line IX-IX.
  • the mobile-phone-use liquid crystal display module of the related art includes a liquid crystal panel 20 which is constituted of glass substrates 2 , 3 with a liquid crystal layer not shown in the drawing sandwiched therebetween and the polarizer 1 arranged on the glass substrate 2 , a semiconductor chip 4 which is mounted on the glass substrate 3 , a liquid-crystal-panel-use FPC (Flexible Printed Circuit) 5 which is electrically connected to the semiconductor chip 4 , a resin mold 6 which supports the liquid crystal panel 20 , a reflection sheet 10 , the electrostatic-capacitance-type touch panel 7 which is adhered to the polarizer 1 by way of an adhesive layer (ultraviolet-curing adhesive material) 11 and is larger than the polarizer 1 in size, a touch-panel-use FPC 8 , and the front window 9 which is adhered to the touch panel 7 by way of an adhesive layer (ultraviolet-curing adhesive material) 12 and is larger than the touch panel 7 in
  • FIG. 10 is a top plan view of another mobile-phone-use liquid crystal display module of the related art having the three-layered hybrid structure.
  • FIG. 11 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XI-XI.
  • FIG. 12 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XII-XII.
  • the mobile-phone-use liquid crystal display module shown in FIG. 10 to FIG. 12 has the same constitution as the mobile-phone-use liquid crystal display module shown in FIG. 7 to FIG. 9 except for that the mobile-phone-use liquid crystal display module shown in FIG. 10 to FIG. 12 includes a front window 13 having a size substantially equal to a size of the polarizer 1 .
  • the rigid liquid crystal panel 20 and the rigid touch panel 7 are adhered to each other using the ultraviolet-curing adhesive material 11
  • the rigid touch panel 7 and the rigid front window 13 are adhered to each other using the ultraviolet-curing adhesive material 12 .
  • the ultraviolet-curing adhesive materials 11 , 12 do not have a sufficient adhesive strength for adhering an elastic layer to the rigid layer before the radiation of ultraviolet rays while straightening the elastic layer having a warp. Accordingly, as shown in FIG.
  • the semiconductor chip 4 is liable to be easily cracked or broken due to an impact generated when a mobile phone falls or the like. To prevent the occurrence of such cracks or breaking, a thickness of the semiconductor chip 4 may be increased as much as possible. However, to consider a case where the thickness of the semiconductor chip 4 is excessively large, when the touch panel 7 projects or overhangs above the semiconductor chip 4 (see FIG. 11 ), there exists a possibility that the touch panel 7 which is adhered to the liquid crystal panel 20 in an inclined manner with respect to the liquid crystal panel 20 and the semiconductor chip 4 are brought into contact with each other as shown in FIG. 14 .
  • irregularities of a resistance value is large with respect to the conductive resin 14 , and a DC resistance component of the conductive resin 14 may exceed several M ⁇ .
  • the touch panel 7 is an electrostatic-capacitance-type touch panel, there exists a possibility that charges on a surface of the glass substrate 2 cannot be efficiently discharged.
  • the present invention has been made to overcome the above-mentioned drawbacks, and it is a first object of the present invention to provide a liquid crystal display which can reliably adhere an elastic layer which is liable to warp easily to a rigid layer.
  • the liquid crystal display according to the present invention includes an elastic layer, a rigid layer and an adhesive sheet for adhering the elastic layer to the rigid layer.
  • the elastic layer which is liable to warp easily can be adhered to the rigid layer.
  • the elastic layer is formed of an elastic front window
  • the rigid layer is formed of a rigid touch panel. According to this mode, it is possible to adhere the elastic front window to the rigid touch panel.
  • the elastic layer is formed of an elastic touch panel
  • the rigid layer is formed of a rigid liquid crystal panel. According to this mode, it is possible to adhere the elastic touch panel to the rigid liquid crystal panel.
  • the liquid crystal display may further include an elastic front window and another adhesive sheet which adheres the elastic front window to the elastic touch panel adhered to the rigid liquid crystal panel by way of the adhesive sheet. Further, the liquid crystal display may further include the rigid front window and an ultraviolet-curing adhesive material which adheres the rigid front window to the elastic touch panel adhered to the rigid liquid crystal panel by way of the adhesive sheet.
  • the elastic layer is formed of an elastic touch panel
  • the rigid layer is formed of a rigid front window. According to this mode, it is possible to adhere the elastic touch panel to the rigid front window.
  • the liquid crystal display may further include the rigid liquid crystal panel and an ultraviolet-curing adhesive material which adheres the rigid liquid crystal panel to the elastic touch panel adhered to the rigid front window by way of the adhesive sheet.
  • a liquid crystal display which includes: a first substrate; a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate; a semiconductor element which is mounted on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate; a polarizer which is arranged on the second substrate; a touch panel which is adhered to the polarizer by way of a first adhesive layer, and allows one edge thereof to face at least a portion of the region where the semiconductor element is mounted; and a front window which is adhered to the touch panel by way of a second adhesive layer, wherein a thickness of the semiconductor element is smaller than a sum of a thickness of the polarizer and a thickness of the second substrate.
  • the thickness of the semiconductor element may be smaller than a sum of one half of the thickness of the polarizer and the thickness of the second substrate.
  • the thickness of the semiconductor element is larger than the thickness of the second substrate. According to this mode, it is possible to prevent the touch panel and the semiconductor element from coming into contact with each other while ensuring a strength (for example, crack resistance) of the semiconductor element in the thickness direction.
  • a liquid crystal display which includes: a first substrate; a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate; a semiconductor element which is mounted on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate; a polarizer which is arranged on the second substrate; a touch panel which is adhered to the polarizer by way of a first adhesive layer; and a front window which is adhered to the touch panel by way of a second adhesive layer, wherein one edge of the touch panel projects or overhangs from a region which faces the semiconductor element in an opposed manner so as to prevent the one edge of the touch panel from coming into contact with an upper surface of the semiconductor element when the one edge of the touch panel is displaced in the first substrate direction.
  • a liquid crystal display which includes: an IPS type liquid crystal panel which includes a first substrate on which a plurality of pairs of electrodes each of which consists of a pixel electrode and a counter electrode are formed, a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate, and a polarizer which is arranged on the second substrate; a touch panel which is adhered to the polarizer by way of an adhesive layer; and a conductive tape which electrically connects a ground electrode which is formed on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate and a conductive film formed on the second substrate with each other.
  • a thickness of the conductive tape is smaller than a thickness of the polarizer. According to this mode, it is possible to reduce a thickness of the liquid crystal display.
  • the conductive tape is adhered to the ground electrode and the conductive film respectively by thermocompression bonding.
  • the touch panel is an electrostatic-capacitance-type touch panel.
  • FIG. 1A to FIG. 1D are four schematic cross-sectional views showing representative examples of a mobile-phone-use liquid crystal display module according to an embodiment 1 of the present invention
  • FIG. 2 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 2 of the present invention
  • FIG. 3 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 3 of the present invention
  • FIG. 4 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 4 of the present invention.
  • FIG. 5 is a view showing a mobile-phone-use liquid crystal display module of the related art in a state where a polarizer is exposed (a state before a touch panel and a front window are adhered to each other);
  • FIG. 6 is a view showing a state in which the touch panel is adhered to the polarizer shown in FIG. 5 (a state before the front window is adhered);
  • FIG. 7 is a top plan view of the mobile-phone-use liquid crystal display module shown in FIG. 6 which has the three-layered hybrid structure in which the front window is further adhered to the touch panel;
  • FIG. 8 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line VIII-VIII;
  • FIG. 9 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line IX-IX;
  • FIG. 10 is a top plan view of another mobile-phone-use liquid crystal display module of the related art having the three-layered hybrid structure;
  • FIG. 11 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XI-XI;
  • FIG. 12 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XII-XII;
  • FIG. 13A and FIG. 13B are views for explaining a problem of the mobile-phone-use liquid crystal display module of the related art
  • FIG. 14 is a view for explaining a problem of the mobile-phone-use liquid crystal display module of the related art
  • FIG. 15 is a view for explaining a problem of the mobile-phone-use liquid crystal display module of the related art.
  • FIG. 16 is a view for explaining a problem of the mobile-phone-use liquid crystal display module of the related art.
  • FIG. 1A to FIG. 1D are four schematic cross-sectional views showing representative examples of a mobile-phone-use liquid crystal display module according to an embodiment 1 of the present invention.
  • the mobile-phone-use liquid crystal display module shown in FIG. 1A is formed of a liquid crystal display which is constituted by stacking a liquid crystal panel (rigid layer) 20 which is formed of two glass substrates with a liquid crystal layer sandwiched therebetween, an electrostatic-capacitance-type touch panel (rigid layer) 7 which is formed of a glass substrate, for example, and a front window (elastic layer) 23 made of an acrylic resin, for example, in this order.
  • a liquid crystal display which is constituted by stacking a liquid crystal panel (rigid layer) 20 which is formed of two glass substrates with a liquid crystal layer sandwiched therebetween, an electrostatic-capacitance-type touch panel (rigid layer) 7 which is formed of a glass substrate, for example, and a front window (elastic layer) 23 made of an acrylic resin, for example, in this order.
  • the rigid touch panel 7 is adhered to the rigid liquid crystal panel 20 by way of an ultraviolet-curing adhesive material 11 .
  • the elastic front window 23 is adhered to the rigid touch panel 7 by way of an adhesive sheet 30 formed of a transparent sheet member which has both surfaces thereof covered with a transparent adhesive material by coating.
  • the adhesive sheet 30 Different from an ultraviolet-curing adhesive material which exhibits a different adhesive strength between before and after the radiation of ultraviolet rays, the adhesive sheet 30 originally possesses an adhesive strength sufficient to adhere an elastic layer to a rigid layer while straightening the elastic layer having a warp. Accordingly, the elastic front window 23 which is liable to warp easily can be adhered to the rigid touch panel 7 .
  • the mobile-phone-use liquid crystal display module shown in FIG. 1B is formed of a liquid crystal display which is constituted by stacking a liquid crystal panel (rigid layer) 20 which is formed of two glass substrates with a liquid crystal layer sandwiched therebetween, a touch panel (elastic layer) which is made of a resin material, for example, and a front window (elastic layer) 23 made of an acrylic resin, for example, in this order.
  • a liquid crystal display which is constituted by stacking a liquid crystal panel (rigid layer) 20 which is formed of two glass substrates with a liquid crystal layer sandwiched therebetween, a touch panel (elastic layer) which is made of a resin material, for example, and a front window (elastic layer) 23 made of an acrylic resin, for example, in this order.
  • the elastic touch panel 17 is adhered to the rigid liquid crystal panel 20 by way of an adhesive sheet 30 and, then, the elastic front window 23 is also adhered to the elastic touch panel 17 which is adhered to the rigid liquid crystal panel 20 by way of the adhesive sheet 30 .
  • the elastic touch panel 17 which is liable to warp easily can be adhered to the rigid liquid crystal panel 20 and, at the same time, the elastic front window 23 which is liable to warp easily can be adhered to the elastic touch panel 17 which is adhered to the rigid liquid crystal panel 20 .
  • the elastic touch panel 17 is adhered to the rigid liquid crystal panel 20 by way of an adhesive sheet 30 and, thereafter, the rigid front window 13 is adhered to the elastic touch panel 17 which is adhered to the rigid liquid crystal panel 20 by way of an ultraviolet-curing adhesive material 12 . Due to such a constitution, the elastic touch panel 17 also becomes a rigid layer due to the adhesion of the elastic touch panel 17 to the rigid liquid crystal panel 20 . Accordingly, it is possible to use the ultraviolet-curing adhesive material 12 for adhering the touch panel 17 which becomes the rigid layer and the rigid front window 13 to each other.
  • the touch panel 17 which is liable to warp easily can be adhered to the rigid liquid crystal panel 20 and the rigid front window 13 respectively.
  • FIG. 2 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 2 of the present invention.
  • the glass substrate 2 is arranged to face the glass substrate 3 in an opposed manner with the liquid crystal layer sandwiched therebetween.
  • Pixel electrodes for applying an electric field to the liquid crystal layer are formed on a liquid-crystal-layer-side surface of the glass substrate 2 or the glass substrate 3
  • counter electrodes which face the pixel electrodes are formed on a liquid-crystal-layer-side surface of the glass substrate 3 .
  • a distance D 1 between one edge of the touch panel 7 and an upper surface of the semiconductor chip 4 is set larger than 0 and hence, it is possible to prevent the touch panel 7 and the semiconductor chip 4 from coming into contact with each other.
  • the thickness of the semiconductor chip 4 may be decided based on a distance D 2 between the adhesive layer 11 and the semiconductor chip 4 in the lateral direction (generally, being set to approximately 2.5 mm), a longitudinal length and an elastic modulus of the touch panel 7 , a thickness of the adhesive layer 11 and the like.
  • the mobile-phone-use liquid crystal display module is formed of a liquid crystal display having the “three-layered hybrid structure”.
  • the liquid crystal display includes a liquid crystal panel 20 which is constituted of glass substrates 2 , 3 with a liquid crystal layer not shown in the drawing sandwiched therebetween and a polarizer 1 arranged on the glass substrate 2 , a semiconductor chip 4 which is mounted on the glass substrate 3 , a liquid-crystal-panel-use FPC 5 which is electrically connected to the semiconductor chip 4 , a resin mold 6 which supports the liquid crystal panel 20 , a reflection sheet 10 , a touch panel 7 which is adhered to the polarizer 1 by way of an adhesive layer (ultraviolet-curing adhesive material) 11 and is larger than the polarizer 1 in size, a touch-panel-use FPC 8 not shown in the drawing, and a front window 9 which is adhered to the touch panel 7 by way of an adhesive layer (ultraviolet-curing adhesive material) 12 and is
  • the semiconductor chip 4 is mounted on a region of the liquid-crystal-layer-side surface of the glass substrate 3 excluding a region of the surface which faces the glass substrate 2 in an opposed manner, and drives the liquid crystal panel 20 by controlling potentials which are applied to the pixel electrodes and the counter electrodes respectively.
  • a thickness of the semiconductor chip 4 is set smaller than a sum of a thickness of the polarizer 1 and a thickness of the glass substrate 2 .
  • the touch panel 7 is adhered to the polarizer 1 by way of the adhesive layer 11 .
  • FIG. 4 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 4 of the present invention.
  • the mobile-phone-use liquid crystal display module is formed of a liquid crystal display having the “three-layered hybrid structure”.
  • the liquid crystal display includes an IPS-type liquid crystal panel 20 which is constituted of glass substrates 2 , 3 with a liquid crystal layer not shown in the drawing sandwiched therebetween and a polarizer 1 arranged on the glass substrate 2 , a semiconductor chip 4 which is mounted on the glass substrate 3 , a liquid-crystal-panel-use FPC 5 which is electrically connected to the semiconductor chip 4 , a resin mold 6 which supports the liquid crystal panel 20 , a reflection sheet 10 , an electrostatic-capacitance-type touch panel 7 which is adhered to the polarizer 1 by way of an adhesive layer (ultraviolet-curing adhesive material) 11 , a touch-panel-use FPC 8 not shown in the drawing, a front window which is adhered to the touch panel 7 by way of an adhesive layer (ultraviolet-curing adhesive material) 12 , and
  • the semiconductor chip 4 is mounted on the region of the liquid-crystal-layer-side surface of the glass substrate 3 excluding the region of the surface which faces the glass substrate 2 in an opposed manner, and the semiconductor chip 4 drives the liquid crystal panel 20 by controlling potentials applied to the pixel electrodes and the counter electrodes formed on the glass substrate 3 respectively.
  • one end of the conductive tape 15 is adhered to the ground electrode formed on the glass substrate by thermocompression bonding, and the other end of the conductive tape 15 is adhered to the ITO film formed on the upper surface of the glass substrate 2 by thermocompression bonding.
  • the conductive tape 15 has a thickness smaller than a thickness of a conductive resin film which has been conventionally used as a discharge path and hence, there is no possibility that the touch panel 7 is brought into contact with the conductive tape 15 .
  • a thickness of the conductive tape 15 may be set smaller than a thickness of the polarizer 1 . Due to such a constitution, it is possible to reduce a thickness of the mobile-phone-use liquid crystal display module as a whole.
  • the mobile-phone-use liquid crystal display module of the embodiment 4 it is possible to efficiently discharge the charges on the IPS-type liquid crystal panel 20 and, at the same time, the thickness of the module can be decreased as a whole.
  • the present invention is not limited to the above-mentioned embodiments 1 to 4.
  • the present invention is not limited to the mobile-phone-use liquid crystal display module and is widely applicable to a liquid crystal display which is mounted on a portable gaming machine, a digital camera, a PDA or the like.

Abstract

A liquid crystal display which can reliably adhere an elastic layer which is liable to warp easily to a rigid layer is provided. (a) An elastic front window is adhered to a rigid touch panel by way of an adhesive sheet. (b) An elastic touch panel is adhered to a rigid liquid crystal panel by way of an adhesive sheet, and an elastic front window is adhered to the elastic touch panel byway of an adhesive sheet. (c) An elastic touch panel is adhered to a rigid liquid crystal panel by way of an adhesive sheet and, thereafter, a rigid front window is adhered to the elastic touch panel by way of an ultraviolet-curing adhesive material. (d) An elastic touch panel is adhered to a rigid front window by way of an adhesive sheet and, thereafter, a rigid liquid crystal panel is adhered to the elastic touch panel by way of an ultraviolet-curing adhesive material.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • The disclosure of Japanese Patent Application No. 2008-197213 filed on Jul. 31, 2008 including the specification, drawings, and abstract is incorporated herein by reference in its entirety.
    • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates to a liquid crystal display.
  • 2. Related Art
  • With respect to portable devices such as a mobile phone, a portable gaming machine, a digital camera and a PDA (Personal Digital Assistant), there has been known a portable device which adopts a liquid crystal display formed by stacking a liquid crystal panel, a touch panel and a front window. Such a liquid crystal display has the structure in which the liquid crystal panel and the touch panel are adhered to each other using an adhesive material, and the touch panel and the front window are adhered to each other using an adhesive material (hereinafter referred to as three-layered hybrid structure) Here, the constitution of a mobile-phone-use liquid crystal display module which constitutes one example of a liquid crystal display of the related art having the three-layered hybrid structure is explained in conjunction with FIG. 5 to FIG. 12.
  • FIG. 5 is a view showing a mobile-phone-use liquid crystal display module of the related art in a state where a polarizer 1 is exposed (a state before a touch panel 7 and a front window 9 are adhered to each other). FIG. 6 is a view showing a state in which the touch panel 7 is adhered to the polarizer 1 shown in FIG. 5 (a state before the front window 9 is adhered). FIG. 7 is a top plan view of the mobile-phone-use liquid crystal display module shown in FIG. 6 which has the three-layered hybrid structure in which the front window 9 is further adhered to the touch panel 7. FIG. 8 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line VIII-VIII. FIG. 9 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line IX-IX.
  • As shown in FIG. 5 to FIG. 9, the mobile-phone-use liquid crystal display module of the related art includes a liquid crystal panel 20 which is constituted of glass substrates 2, 3 with a liquid crystal layer not shown in the drawing sandwiched therebetween and the polarizer 1 arranged on the glass substrate 2, a semiconductor chip 4 which is mounted on the glass substrate 3, a liquid-crystal-panel-use FPC (Flexible Printed Circuit) 5 which is electrically connected to the semiconductor chip 4, a resin mold 6 which supports the liquid crystal panel 20, a reflection sheet 10, the electrostatic-capacitance-type touch panel 7 which is adhered to the polarizer 1 by way of an adhesive layer (ultraviolet-curing adhesive material) 11 and is larger than the polarizer 1 in size, a touch-panel-use FPC 8, and the front window 9 which is adhered to the touch panel 7 by way of an adhesive layer (ultraviolet-curing adhesive material) 12 and is larger than the touch panel 7 in size.
  • FIG. 10 is a top plan view of another mobile-phone-use liquid crystal display module of the related art having the three-layered hybrid structure. FIG. 11 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XI-XI. FIG. 12 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XII-XII. The mobile-phone-use liquid crystal display module shown in FIG. 10 to FIG. 12 has the same constitution as the mobile-phone-use liquid crystal display module shown in FIG. 7 to FIG. 9 except for that the mobile-phone-use liquid crystal display module shown in FIG. 10 to FIG. 12 includes a front window 13 having a size substantially equal to a size of the polarizer 1.
    • SUMMARY OF THE INVENTION
  • However, the above-mentioned liquid crystal displays of the related art have a plurality of following drawbacks. Here, such drawbacks of the related art are explained by taking the mobile-phone-use liquid crystal display module shown in FIG. 10 to FIG. 12 as an example.
  • (1) In the mobile-phone use liquid crystal display module of the related art, as shown in FIG. 13A, the rigid liquid crystal panel 20 and the rigid touch panel 7 are adhered to each other using the ultraviolet-curing adhesive material 11, and the rigid touch panel 7 and the rigid front window 13 are adhered to each other using the ultraviolet-curing adhesive material 12. However, the ultraviolet-curing adhesive materials 11, 12 do not have a sufficient adhesive strength for adhering an elastic layer to the rigid layer before the radiation of ultraviolet rays while straightening the elastic layer having a warp. Accordingly, as shown in FIG. 13B, when the ultraviolet-curing adhesive materials 11, 12 are used as a material for adhering a front window 23 made of an elastic material such as an acrylic resin which is liable to easily warp and the rigid touch panel 7, there exists a possibility that the front window 23 is not reliably adhered to the touch panel 7.
  • (2) The semiconductor chip 4 is liable to be easily cracked or broken due to an impact generated when a mobile phone falls or the like. To prevent the occurrence of such cracks or breaking, a thickness of the semiconductor chip 4 may be increased as much as possible. However, to consider a case where the thickness of the semiconductor chip 4 is excessively large, when the touch panel 7 projects or overhangs above the semiconductor chip 4 (see FIG. 11), there exists a possibility that the touch panel 7 which is adhered to the liquid crystal panel 20 in an inclined manner with respect to the liquid crystal panel 20 and the semiconductor chip 4 are brought into contact with each other as shown in FIG. 14.
  • (3) Further, when the touch panel 7 projects or overhangs above the semiconductor chip 4 (see FIG. 11), due to the application of pressure to an edge portion of the front window 9, the generation of the instantaneous deflection of the front window 9 or the like, as shown in FIG. 15, there exists a possibility that one edge of the touch panel 7 (semiconductor-chip-4-side edge) bumps into an upper surface of the semiconductor chip 4 so that the semiconductor chip 4 is broken.
  • (4) when the liquid crystal panel 20 is of an IPS (In Plane Switching: lateral electric field switching) type, to discharge charges on a surface of the touch-panel-7-side glass substrate 2, there has been generally adopted a method in which a conductive film (ITO (Indium Tin Oxide) film) formed on an upper surface of the glass substrate 2 and a ground electrode formed on an upper surface of the glass substrate 3 are directly connected with each other using a conductive resin 14 such as an epoxy resin in which silver powder is impregnated. However, the formation of the thin film made of the conductive resin 14 on the glass substrate 2 by coating is not easy and hence, there exists a possibility that the touch panel 7 is brought into contact with the conductive resin 14 as shown in FIG. 16. Further, irregularities of a resistance value is large with respect to the conductive resin 14, and a DC resistance component of the conductive resin 14 may exceed several MΩ. Particularly when the touch panel 7 is an electrostatic-capacitance-type touch panel, there exists a possibility that charges on a surface of the glass substrate 2 cannot be efficiently discharged.
  • The present invention has been made to overcome the above-mentioned drawbacks, and it is a first object of the present invention to provide a liquid crystal display which can reliably adhere an elastic layer which is liable to warp easily to a rigid layer.
  • It is a second object of the present invention to provide a liquid crystal display which prevents a touch panel adhered to a liquid crystal panel by way of an adhesive layer and a semiconductor element mounted on the liquid crystal panel from coming into contact with each other.
  • It is a third object of the present invention to provide a liquid crystal display which can prevent breaking of a semiconductor element due to bumping of one edge of the touch panel adhered to the liquid crystal panel by way of the adhesive layer into an upper surface of a semiconductor element mounted on the liquid crystal panel by an external force.
  • It is a fourth object of the present invention to provide a liquid crystal display which can efficiently discharge charges on an IPS-type liquid crystal panel.
  • (1) According to one aspect of the present invention, the liquid crystal display according to the present invention includes an elastic layer, a rigid layer and an adhesive sheet for adhering the elastic layer to the rigid layer.
  • According to one aspect of the present invention described above, the elastic layer which is liable to warp easily can be adhered to the rigid layer.
  • According to one mode of the present invention, the elastic layer is formed of an elastic front window, and the rigid layer is formed of a rigid touch panel. According to this mode, it is possible to adhere the elastic front window to the rigid touch panel.
  • According to one mode of the present invention, the elastic layer is formed of an elastic touch panel, and the rigid layer is formed of a rigid liquid crystal panel. According to this mode, it is possible to adhere the elastic touch panel to the rigid liquid crystal panel.
  • In this mode, the liquid crystal display may further include an elastic front window and another adhesive sheet which adheres the elastic front window to the elastic touch panel adhered to the rigid liquid crystal panel by way of the adhesive sheet. Further, the liquid crystal display may further include the rigid front window and an ultraviolet-curing adhesive material which adheres the rigid front window to the elastic touch panel adhered to the rigid liquid crystal panel by way of the adhesive sheet.
  • According to one mode of the present invention, the elastic layer is formed of an elastic touch panel, and the rigid layer is formed of a rigid front window. According to this mode, it is possible to adhere the elastic touch panel to the rigid front window.
  • In this mode, the liquid crystal display may further include the rigid liquid crystal panel and an ultraviolet-curing adhesive material which adheres the rigid liquid crystal panel to the elastic touch panel adhered to the rigid front window by way of the adhesive sheet.
  • Further, according to one mode of the present invention, the adhesive sheet is a transparent sheet member, and a transparent adhesive material is applied to both surfaces of the sheet member by coating.
  • (2) According to another aspect of the present invention, there is provided a liquid crystal display which includes: a first substrate; a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate; a semiconductor element which is mounted on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate; a polarizer which is arranged on the second substrate; a touch panel which is adhered to the polarizer by way of a first adhesive layer, and allows one edge thereof to face at least a portion of the region where the semiconductor element is mounted; and a front window which is adhered to the touch panel by way of a second adhesive layer, wherein a thickness of the semiconductor element is smaller than a sum of a thickness of the polarizer and a thickness of the second substrate.
  • According to another aspect of the present invention, it is possible to prevent the touch panel which is adhered to the liquid crystal panel including the first substrate and the second substrate which sandwich the liquid crystal layer therebetween and the polarizer by way of the adhesive layer from coming into contact with the semiconductor element which is mounted on the liquid crystal panel. Here, the thickness of the semiconductor element may be smaller than a sum of one half of the thickness of the polarizer and the thickness of the second substrate.
  • According to one mode of the present invention, the thickness of the semiconductor element is larger than the thickness of the second substrate. According to this mode, it is possible to prevent the touch panel and the semiconductor element from coming into contact with each other while ensuring a strength (for example, crack resistance) of the semiconductor element in the thickness direction.
  • (3) According to still another aspect of the present invention, there is provided a liquid crystal display which includes: a first substrate; a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate; a semiconductor element which is mounted on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate; a polarizer which is arranged on the second substrate; a touch panel which is adhered to the polarizer by way of a first adhesive layer; and a front window which is adhered to the touch panel by way of a second adhesive layer, wherein one edge of the touch panel projects or overhangs from a region which faces the semiconductor element in an opposed manner so as to prevent the one edge of the touch panel from coming into contact with an upper surface of the semiconductor element when the one edge of the touch panel is displaced in the first substrate direction.
  • According to still another aspect of the present invention, it is possible to prevent one edge of the touch panel which is adhered to the liquid crystal panel including the first substrate and the second substrate which sandwich the liquid crystal layer therebetween and the polarizer by way of the adhesive layer from bumping into the upper surface of the semiconductor element mounted on the liquid crystal panel by an external force and breaking the semiconductor element.
  • (4) According to a further aspect of the present invention, there is provided a liquid crystal display which includes: an IPS type liquid crystal panel which includes a first substrate on which a plurality of pairs of electrodes each of which consists of a pixel electrode and a counter electrode are formed, a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate, and a polarizer which is arranged on the second substrate; a touch panel which is adhered to the polarizer by way of an adhesive layer; and a conductive tape which electrically connects a ground electrode which is formed on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate and a conductive film formed on the second substrate with each other.
  • According to the further aspect of the present invention, it is possible to efficiently discharge charges in the IPS-type liquid crystal panel.
  • According to one mode of the present invention, a thickness of the conductive tape is smaller than a thickness of the polarizer. According to this mode, it is possible to reduce a thickness of the liquid crystal display.
  • According to one mode of the present invention, the conductive tape is adhered to the ground electrode and the conductive film respectively by thermocompression bonding.
  • According to one mode of the present invention, the touch panel is an electrostatic-capacitance-type touch panel.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1A to FIG. 1D are four schematic cross-sectional views showing representative examples of a mobile-phone-use liquid crystal display module according to an embodiment 1 of the present invention;
  • FIG. 2 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 2 of the present invention;
  • FIG. 3 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 3 of the present invention;
  • FIG. 4 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 4 of the present invention;
  • FIG. 5 is a view showing a mobile-phone-use liquid crystal display module of the related art in a state where a polarizer is exposed (a state before a touch panel and a front window are adhered to each other);
  • FIG. 6 is a view showing a state in which the touch panel is adhered to the polarizer shown in FIG. 5 (a state before the front window is adhered);
  • FIG. 7 is a top plan view of the mobile-phone-use liquid crystal display module shown in FIG. 6 which has the three-layered hybrid structure in which the front window is further adhered to the touch panel;
  • FIG. 8 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line VIII-VIII;
  • FIG. 9 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 6 taken along a line IX-IX;
  • FIG. 10 is a top plan view of another mobile-phone-use liquid crystal display module of the related art having the three-layered hybrid structure;
  • FIG. 11 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XI-XI;
  • FIG. 12 is a cross-sectional view of the mobile-phone-use liquid crystal display module shown in FIG. 10 taken along a line XII-XII;
  • FIG. 13A and FIG. 13B are views for explaining a problem of the mobile-phone-use liquid crystal display module of the related art;
  • FIG. 14 is a view for explaining a problem of the mobile-phone-use liquid crystal display module of the related art;
  • FIG. 15 is a view for explaining a problem of the mobile-phone-use liquid crystal display module of the related art; and
  • FIG. 16 is a view for explaining a problem of the mobile-phone-use liquid crystal display module of the related art.
    •  DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Hereinafter, embodiments of the present invention are explained in detail in conjunction with drawings. Here, in the drawings, identical constitutional elements are given same numerals or symbols and their repeated explanation is omitted.
    • Embodiment 1
  • FIG. 1A to FIG. 1D are four schematic cross-sectional views showing representative examples of a mobile-phone-use liquid crystal display module according to an embodiment 1 of the present invention.
  • The mobile-phone-use liquid crystal display module shown in FIG. 1A is formed of a liquid crystal display which is constituted by stacking a liquid crystal panel (rigid layer) 20 which is formed of two glass substrates with a liquid crystal layer sandwiched therebetween, an electrostatic-capacitance-type touch panel (rigid layer) 7 which is formed of a glass substrate, for example, and a front window (elastic layer) 23 made of an acrylic resin, for example, in this order.
  • Here, in the same manner as a technique adopted by the related art, the rigid touch panel 7 is adhered to the rigid liquid crystal panel 20 by way of an ultraviolet-curing adhesive material 11. Further, the elastic front window 23 is adhered to the rigid touch panel 7 by way of an adhesive sheet 30 formed of a transparent sheet member which has both surfaces thereof covered with a transparent adhesive material by coating.
  • Different from an ultraviolet-curing adhesive material which exhibits a different adhesive strength between before and after the radiation of ultraviolet rays, the adhesive sheet 30 originally possesses an adhesive strength sufficient to adhere an elastic layer to a rigid layer while straightening the elastic layer having a warp. Accordingly, the elastic front window 23 which is liable to warp easily can be adhered to the rigid touch panel 7.
  • The mobile-phone-use liquid crystal display module shown in FIG. 1B is formed of a liquid crystal display which is constituted by stacking a liquid crystal panel (rigid layer) 20 which is formed of two glass substrates with a liquid crystal layer sandwiched therebetween, a touch panel (elastic layer) which is made of a resin material, for example, and a front window (elastic layer) 23 made of an acrylic resin, for example, in this order.
  • Here, the elastic touch panel 17 is adhered to the rigid liquid crystal panel 20 by way of an adhesive sheet 30 and, then, the elastic front window 23 is also adhered to the elastic touch panel 17 which is adhered to the rigid liquid crystal panel 20 by way of the adhesive sheet 30.
  • Due to such a constitution, the elastic touch panel 17 which is liable to warp easily can be adhered to the rigid liquid crystal panel 20 and, at the same time, the elastic front window 23 which is liable to warp easily can be adhered to the elastic touch panel 17 which is adhered to the rigid liquid crystal panel 20.
  • Mobile-phone-use liquid crystal display modules respectively shown in FIG. 1C and FIG. 1D are formed of a liquid crystal display. The liquid crystal display is constituted by stacking a liquid crystal panel (rigid layer) 20 which is formed of two glass substrates with a liquid crystal layer sandwiched therebetween, a touch panel (elastic layer) 17 which is made of a resin material, for example, and a front window (rigid layer) 13 which is made of reinforced glass, for example, in this order.
  • With respect to the mobile-phone-use liquid crystal display module shown in FIG. 1C, the elastic touch panel 17 is adhered to the rigid liquid crystal panel 20 by way of an adhesive sheet 30 and, thereafter, the rigid front window 13 is adhered to the elastic touch panel 17 which is adhered to the rigid liquid crystal panel 20 by way of an ultraviolet-curing adhesive material 12. Due to such a constitution, the elastic touch panel 17 also becomes a rigid layer due to the adhesion of the elastic touch panel 17 to the rigid liquid crystal panel 20. Accordingly, it is possible to use the ultraviolet-curing adhesive material 12 for adhering the touch panel 17 which becomes the rigid layer and the rigid front window 13 to each other.
  • On the other hand, in the mobile-phone-use liquid crystal display module shown in FIG. 1D, the elastic touch panel 17 is adhered to the rigid front window 13 by way of an adhesive sheet 30 and, thereafter, the rigid liquid crystal panel 20 is adhered to the elastic touch panel 17 which is adhered to the rigid front window 13 by way of an ultraviolet-curing adhesive material 11. Due to such a constitution, the elastic touch panel 17 also becomes a rigid layer due to the adhesion of the elastic touch panel 17 to the rigid front window 13. Accordingly, it is possible to use the ultraviolet-curing adhesive material 11 for adhering the touch panel 17 which becomes the rigid layer and the rigid liquid crystal panel 20 to each other.
  • Due to the above-mentioned constitution, the touch panel 17 which is liable to warp easily can be adhered to the rigid liquid crystal panel 20 and the rigid front window 13 respectively.
  • That is, according to the respective mobile-phone-use liquid crystal display modules of the embodiment 1, the elastic layer which is liable to warp easily can be reliably adhered to the rigid layer using the adhesive sheet 30.
  • The present invention is not limited to the mobile-phone-use liquid crystal display modules shown in FIG. 1A to FIG. 1D having the “three-layered hybrid structure”. That is, the present invention is widely applicable to almost all types of liquid crystal displays provided that the display device includes the rigid layer and the elastic layer adhered to the rigid layer.
    • Embodiment 2
  • FIG. 2 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 2 of the present invention.
  • As shown in FIG. 2, the mobile-phone-use liquid crystal display module according to the embodiment 2 is formed of a liquid crystal display having the “three-layered hybrid structure”. The liquid crystal display includes a liquid crystal panel 20 which is constituted of glass substrates 2, 3 with a liquid crystal layer not shown in the drawing sandwiched therebetween and a polarizer 1 (thickness being set to approximately 0.1 mm to 0.14 mm) arranged on the glass substrate 2, a semiconductor chip 4 which is mounted on the glass substrate 3, a liquid-crystal-panel-use FPC 5 which is electrically connected to the semiconductor chip 4, a resin mold 6 which supports the liquid crystal panel 20, a reflection sheet 10, a touch panel 7 which is adhered to the polarizer 1 by way of an adhesive layer (ultraviolet-curing adhesive material) 11 and is larger than the polarizer 1 in size, a touch-panel-use FPC 8 not shown in the drawing, and a front window 9 not shown in the drawing which is adhered to the touch panel 7 by way of an adhesive layer (ultraviolet-curing adhesive material) 12 not shown in the drawing.
  • The glass substrate 2 is arranged to face the glass substrate 3 in an opposed manner with the liquid crystal layer sandwiched therebetween. Pixel electrodes for applying an electric field to the liquid crystal layer are formed on a liquid-crystal-layer-side surface of the glass substrate 2 or the glass substrate 3, and counter electrodes which face the pixel electrodes are formed on a liquid-crystal-layer-side surface of the glass substrate 3.
  • The semiconductor chip 4 is mounted on a region of the liquid-crystal-layer-side surface of the glass substrate 3 excluding a region of the surface which faces the glass substrate 2 in an opposed manner, and drives the liquid crystal panel 20 by controlling potentials which are applied to the pixel electrode and the counter electrode respectively.
  • The touch panel 7 is adhered to the polarizer 1 by way of the adhesive layer 11, and one edge (semiconductor-chip-4-side edge) of the touch panel 7 faces at least a portion of a region formed on the glass substrate 3 on which the semiconductor chip 4 is mounted.
  • In this embodiment, a thickness of the semiconductor chip 4 is set smaller than a sum of a thickness of the polarizer and a thickness of the glass substrate 2. Particularly, it is preferable that the thickness of the semiconductor chip 4 is set smaller than a sum of one half of thickness of the polarizer 1 and a thickness of the glass substrate 2. To be more specific, when the thickness of the polarizer 1 is 0.12 mm and the thickness of the glass substrate 2 is 0.2 mm, the thickness of the semiconductor chip 4 is less than 0.26 mm. Further, when the thickness of the polarizer 1 is 0.12 mm and the thickness of the glass substrate 2 is 0.25 mm, the thickness of the semiconductor chip 4 is less than 0.31 mm.
  • Accordingly, as shown in FIG. 2, even when the touch panel 7 is adhered to the liquid crystal panel 20 in an inclined manner by way of the adhesive layer 11, a distance D1 between one edge of the touch panel 7 and an upper surface of the semiconductor chip 4 is set larger than 0 and hence, it is possible to prevent the touch panel 7 and the semiconductor chip 4 from coming into contact with each other.
  • Further, the thickness of the semiconductor chip 4 may be set larger than the thickness of the glass substrate 2. Due to such a constitution, it is possible to prevent the touch panel 7 and the semiconductor chip 4 from coming into contact with each other while ensuring a strength (for example, crack resistance) of the semiconductor chip 4 in the thickness direction.
  • Here, the thickness of the semiconductor chip 4 may be decided based on a distance D2 between the adhesive layer 11 and the semiconductor chip 4 in the lateral direction (generally, being set to approximately 2.5 mm), a longitudinal length and an elastic modulus of the touch panel 7, a thickness of the adhesive layer 11 and the like.
  • That is, according to the mobile-phone-use liquid crystal display module of the embodiment 2, it is possible to prevent the touch panel 7 which is adhered to the liquid crystal panel 20 by way of the adhesive layer 11 and the semiconductor chip 4 which is mounted on the glass substrate 3 of the liquid crystal panel 20 from coming into contact with each other.
    • Embodiment 3
  • FIG. 3 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 3 of the present invention.
  • As shown in FIG. 3, the mobile-phone-use liquid crystal display module according to the embodiment 3 is formed of a liquid crystal display having the “three-layered hybrid structure”. The liquid crystal display includes a liquid crystal panel 20 which is constituted of glass substrates 2, 3 with a liquid crystal layer not shown in the drawing sandwiched therebetween and a polarizer 1 arranged on the glass substrate 2, a semiconductor chip 4 which is mounted on the glass substrate 3, a liquid-crystal-panel-use FPC 5 which is electrically connected to the semiconductor chip 4, a resin mold 6 which supports the liquid crystal panel 20, a reflection sheet 10, a touch panel 7 which is adhered to the polarizer 1 by way of an adhesive layer (ultraviolet-curing adhesive material) 11 and is larger than the polarizer 1 in size, a touch-panel-use FPC 8 not shown in the drawing, and a front window 9 which is adhered to the touch panel 7 by way of an adhesive layer (ultraviolet-curing adhesive material) 12 and is larger than the touch panel 7 in size.
  • The glass substrate 2 is arranged to face the glass substrate 3 in an opposed manner with the liquid crystal layer sandwiched therebetween. Pixel electrodes for applying an electric field to the liquid crystal layer are formed on a liquid-crystal-layer-side surface of the glass substrate 2 or the glass substrate 3, and counter electrodes which face the pixel electrodes are formed on a liquid-crystal-layer-side surface of the glass substrate 3.
  • The semiconductor chip 4 is mounted on a region of the liquid-crystal-layer-side surface of the glass substrate 3 excluding a region of the surface which faces the glass substrate 2 in an opposed manner, and drives the liquid crystal panel 20 by controlling potentials which are applied to the pixel electrodes and the counter electrodes respectively. A thickness of the semiconductor chip 4 is set smaller than a sum of a thickness of the polarizer 1 and a thickness of the glass substrate 2.
  • The touch panel 7 is adhered to the polarizer 1 by way of the adhesive layer 11.
  • In this embodiment, for preventing one edge (semiconductor-chip-4-side edge) of the touch panel 7 from being brought into contact with an upper surface of the semiconductor chip 4 when the one edge of the touch panel 7 is displaced in the direction toward the glass substrate 3, the one edge of the touch panel 7 projects or overhangs from a region which faces the semiconductor chip 4 in an opposed manner by a length of D3 (D3>0).
  • Due to such a constitution, even when one edge of the touch panel 7 is largely displaced in the direction toward the glass substrate 3 due to the application of pressure to an edge portion of the front window 9, the generation of the instantaneous deflection of the front window 9 or the like, the touch panel 7 is brought into surface contact with the upper surface of the semiconductor chip 4.
  • That is, according to the mobile-phone-use liquid crystal display module of the embodiment 3, it is possible to prevent the semiconductor chip 4 from being broken due to bumping of one edge of the touch panel 7 which is adhered to the liquid crystal panel 20 by way of the adhesive layer 11 into an upper surface of the semiconductor chip 4 which is mounted on the glass substrate 3 of the liquid crystal panel 20 by an external force.
    • Embodiment 4
  • FIG. 4 is a partially cross-sectional view of a mobile-phone-use liquid crystal display module according to an embodiment 4 of the present invention.
  • As shown in FIG. 4, the mobile-phone-use liquid crystal display module according to the embodiment 4 is formed of a liquid crystal display having the “three-layered hybrid structure”. The liquid crystal display includes an IPS-type liquid crystal panel 20 which is constituted of glass substrates 2, 3 with a liquid crystal layer not shown in the drawing sandwiched therebetween and a polarizer 1 arranged on the glass substrate 2, a semiconductor chip 4 which is mounted on the glass substrate 3, a liquid-crystal-panel-use FPC 5 which is electrically connected to the semiconductor chip 4, a resin mold 6 which supports the liquid crystal panel 20, a reflection sheet 10, an electrostatic-capacitance-type touch panel 7 which is adhered to the polarizer 1 by way of an adhesive layer (ultraviolet-curing adhesive material) 11, a touch-panel-use FPC 8 not shown in the drawing, a front window which is adhered to the touch panel 7 by way of an adhesive layer (ultraviolet-curing adhesive material) 12, and a thermocompression bonding type conductive tape 15 (for example, having a thickness of 80 μm or less) which has both edges thereof connected to the glass substrates 2, 3 respectively. The glass substrate 2 is arranged to face the glass substrate 3 in an opposed manner with the liquid crystal layer sandwiched therebetween. An ITO film which is connected to a ground potential is formed on an upper surface of the glass substrate 2.
  • On a liquid-crystal-layer-side surface of the glass substrate 3, a transparent conductive film which includes a plurality of pairs of pixel electrodes and counter electrodes is formed. A lateral electric field with respect to the glass substrate 3 is applied to the liquid crystal layer via the transparent conductive film. Further, on a region of the liquid-crystal-layer-side surface of the glass substrate 3 excluding a region of the surface which faces the glass substrate 2 in an opposed manner, a pad-shaped ground electrode which is connected to a ground line of the liquid-crystal-panel-use FPC 5 is formed.
  • The semiconductor chip 4 is mounted on the region of the liquid-crystal-layer-side surface of the glass substrate 3 excluding the region of the surface which faces the glass substrate 2 in an opposed manner, and the semiconductor chip 4 drives the liquid crystal panel 20 by controlling potentials applied to the pixel electrodes and the counter electrodes formed on the glass substrate 3 respectively.
  • The touch panel 7 is adhered to the polarizer 1 by way of the adhesive layer 11.
  • In this embodiment, one end of the conductive tape 15 is adhered to the ground electrode formed on the glass substrate by thermocompression bonding, and the other end of the conductive tape 15 is adhered to the ITO film formed on the upper surface of the glass substrate 2 by thermocompression bonding. The conductive tape 15 has a thickness smaller than a thickness of a conductive resin film which has been conventionally used as a discharge path and hence, there is no possibility that the touch panel 7 is brought into contact with the conductive tape 15. Here, a thickness of the conductive tape 15 may be set smaller than a thickness of the polarizer 1. Due to such a constitution, it is possible to reduce a thickness of the mobile-phone-use liquid crystal display module as a whole.
  • The thermocompression-bonding-type conductive tape 15 exhibits small resistance irregularities, and a DC resistance component of the resistance is approximately several kΩ. Accordingly, compared to the conductive resin film which has been conventionally used as the discharge path, the discharge efficiency of charges on the surface of the glass substrate 2 can be enhanced.
  • That is, according to the mobile-phone-use liquid crystal display module of the embodiment 4, it is possible to efficiently discharge the charges on the IPS-type liquid crystal panel 20 and, at the same time, the thickness of the module can be decreased as a whole.
  • According to the above-mentioned embodiments 1 to 4, it is possible to overcome the plurality of drawbacks which the mobile-phone-use liquid crystal display module of the related art has.
  • The present invention is not limited to the above-mentioned embodiments 1 to 4. For example, the present invention is not limited to the mobile-phone-use liquid crystal display module and is widely applicable to a liquid crystal display which is mounted on a portable gaming machine, a digital camera, a PDA or the like.

Claims (8)

1. A liquid crystal display comprising:
a first substrate;
a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate;
a semiconductor element which is mounted on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate;
a polarizer which is arranged on the second substrate;
a touch panel which is adhered to the polarizer by way of a first adhesive layer, and allows one edge thereof to face at least a portion of the region where the semiconductor element is mounted; and
a front window which is adhered to the touch panel by way of a second adhesive layer, wherein
a thickness of the semiconductor element is smaller than a sum of a thickness of the polarizer and a thickness of the second substrate.
2. A liquid crystal display according to claim 1, wherein the thickness of the semiconductor element is smaller than a sum of one half of the thickness of the polarizer and the thickness of the second substrate.
3. A liquid crystal display according to claim 1, wherein the thickness of the semiconductor element is larger than the thickness of the second substrate.
4. A liquid crystal display comprising:
a first substrate;
a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate;
a semiconductor element which is mounted on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate;
a polarizer which is arranged on the second substrate;
a touch panel which is adhered to the polarizer by way of a first adhesive layer; and
a front window which is adhered to the touch panel by way of a second adhesive layer, wherein
one edge of the touch panel projects from a region which faces the semiconductor element in an opposed manner so as to prevent the one edge of the touch panel from coming into contact with an upper surface of the semiconductor element when the one edge of the touch panel is displaced in the first substrate direction.
5. A liquid crystal display comprising:
an IPS type liquid crystal panel which includes a first substrate on which a plurality of pairs of electrodes each of which has a pixel electrode and a counter electrode are formed, a second substrate which is arranged to face the first substrate in an opposed manner such that a liquid crystal layer is sandwiched between the first substrate and the second substrate, and a polarizer which is arranged on the second substrate;
a touch panel which is adhered to the polarizer by way of an adhesive layer; and
a conductive tape which electrically connects a ground electrode which is formed on a region of a liquid-crystal-layer-side surface of the first substrate excluding a region where the first substrate faces the second substrate and a conductive film formed on the second substrate with each other.
6. A liquid crystal display according to claim 5, wherein a thickness of the conductive tape is smaller than a thickness of the polarizer.
7. A liquid crystal display according to claim 5, wherein the conductive tape is adhered to the ground electrode and the conductive film respectively by thermocompression bonding.
8. A liquid crystal display according to claim 5, wherein the touch panel is an electrostatic-capacitance-type touch panel.
US12/511,151 2008-07-31 2009-07-29 Liquid Crystal Display Abandoned US20100026662A1 (en)

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US13/603,847 US9035893B2 (en) 2008-07-31 2012-09-05 Portable device and method of manufacturing a display device
US14/687,719 US9423904B2 (en) 2008-07-31 2015-04-15 Portable device and method of manufacturing a display device
US15/212,395 US9606391B2 (en) 2008-07-31 2016-07-18 Portable device and method of manufacturing a display device
US15/428,546 US9921424B2 (en) 2008-07-31 2017-02-09 Portable device and method of manufacturing a display device
US15/879,550 US10228581B2 (en) 2008-07-31 2018-01-25 Portable device and method of manufacturing a display device
US16/255,969 US10459274B2 (en) 2008-07-31 2019-01-24 Portable device and method of manufacturing a display device
US16/574,228 US10788698B2 (en) 2008-07-31 2019-09-18 Portable device and method of manufacturing a display device
US17/001,748 US11143899B2 (en) 2008-07-31 2020-08-25 Portable device and method of manufacturing a display device
US17/467,599 US11422399B2 (en) 2008-07-31 2021-09-07 Portable device and method of manufacturing a display device

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JP2008197213A JP2010032938A (en) 2008-07-31 2008-07-31 Liquid crystal display

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US12/511,151 Abandoned US20100026662A1 (en) 2008-07-31 2009-07-29 Liquid Crystal Display
US13/603,847 Active US9035893B2 (en) 2008-07-31 2012-09-05 Portable device and method of manufacturing a display device
US14/687,719 Active US9423904B2 (en) 2008-07-31 2015-04-15 Portable device and method of manufacturing a display device
US15/212,395 Active US9606391B2 (en) 2008-07-31 2016-07-18 Portable device and method of manufacturing a display device
US15/428,546 Active US9921424B2 (en) 2008-07-31 2017-02-09 Portable device and method of manufacturing a display device
US15/879,550 Active US10228581B2 (en) 2008-07-31 2018-01-25 Portable device and method of manufacturing a display device
US16/255,969 Active US10459274B2 (en) 2008-07-31 2019-01-24 Portable device and method of manufacturing a display device
US16/574,228 Active US10788698B2 (en) 2008-07-31 2019-09-18 Portable device and method of manufacturing a display device
US17/001,748 Active US11143899B2 (en) 2008-07-31 2020-08-25 Portable device and method of manufacturing a display device
US17/467,599 Active US11422399B2 (en) 2008-07-31 2021-09-07 Portable device and method of manufacturing a display device

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US15/212,395 Active US9606391B2 (en) 2008-07-31 2016-07-18 Portable device and method of manufacturing a display device
US15/428,546 Active US9921424B2 (en) 2008-07-31 2017-02-09 Portable device and method of manufacturing a display device
US15/879,550 Active US10228581B2 (en) 2008-07-31 2018-01-25 Portable device and method of manufacturing a display device
US16/255,969 Active US10459274B2 (en) 2008-07-31 2019-01-24 Portable device and method of manufacturing a display device
US16/574,228 Active US10788698B2 (en) 2008-07-31 2019-09-18 Portable device and method of manufacturing a display device
US17/001,748 Active US11143899B2 (en) 2008-07-31 2020-08-25 Portable device and method of manufacturing a display device
US17/467,599 Active US11422399B2 (en) 2008-07-31 2021-09-07 Portable device and method of manufacturing a display device

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US9423904B2 (en) 2016-08-23
US9606391B2 (en) 2017-03-28
US20190155081A1 (en) 2019-05-23
US11143899B2 (en) 2021-10-12
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US20210397030A1 (en) 2021-12-23
US20200012136A1 (en) 2020-01-09
US20160327821A1 (en) 2016-11-10
US11422399B2 (en) 2022-08-23
US10459274B2 (en) 2019-10-29
US9035893B2 (en) 2015-05-19
US10228581B2 (en) 2019-03-12
US9921424B2 (en) 2018-03-20
US20180149899A1 (en) 2018-05-31
US20200387020A1 (en) 2020-12-10
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US20170153476A1 (en) 2017-06-01
US20120327007A1 (en) 2012-12-27

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