US20100033654A1 - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- US20100033654A1 US20100033654A1 US12/534,219 US53421909A US2010033654A1 US 20100033654 A1 US20100033654 A1 US 20100033654A1 US 53421909 A US53421909 A US 53421909A US 2010033654 A1 US2010033654 A1 US 2010033654A1
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- Prior art keywords
- liquid crystal
- heating member
- substrate
- crystal display
- temperature
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- 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
- G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/008—Mountings, adjusting means, or light-tight connections, for optical elements with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
-
- 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
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A liquid crystal display device includes a panel, a heater, and a temperature detector. The panel includes substrates electrodes and liquid crystal. The electrodes and the liquid crystal are disposed between the substrates. The heater has a transparent heating member, and the heating member emits heat by being supplied with electricity. At least a part of the heating member of the heater is located to overlap with a display area of the panel in a thickness direction of the substrates. A temperature detecting portion of the temperature detector and the heating member of the heater are located adjacent to each other.
Description
- This application is based on Japanese Patent Application No. 2008-204727 filed on Aug. 7, 2008, the disclosure of which is incorporated herein by reference in its entirety.
- 1. Field of the Invention
- The present invention relates to a liquid crystal display device.
- 2. Description of Related Art
- JP-A-2004-037535 or JP-U-56-128618 discloses a liquid crystal display device having a panel heater located on a back side of a liquid crystal display panel. Liquid crystal sealed in the liquid crystal display panel is conditioned by being heated through the panel heater.
- JP-U-56-128618 further discloses a temperature detector located adjacent to the liquid crystal display panel. The temperature detector detects ambient temperature of the liquid crystal display panel. When the temperature detector detects the ambient temperature to be low, the panel heater is activated.
- However, in a case that the temperature detector is located adjacent to the liquid crystal display panel, the temperature detector is disposed on a substrate of the liquid crystal display panel, for example. Thus, when the heater is activated, heat is transmitted from the heater to the temperature detector through the substrate of the liquid crystal display panel. Because the substrate is typically made of transparent glass or resin having relatively large thermal capacity, it takes certain time to transmit heat from the heater to the temperature detector. Therefore, when liquid crystal is heated by the heater, heat transmission from the heater to the temperature detector is delayed. Thus, detection accuracy may become low, because it is difficult for the temperature detector to immediately detect temperature increasing when the heater is activated.
- When the detection accuracy is lowered, liquid crystal may be overheated, because a controllability of the heater is lowered. When liquid crystal is overheated, a contrast of the liquid crystal display panel may be lowered, and a control circuit located adjacent to the overheated liquid crystal may be affected. Thus, a display quality of the liquid crystal display panel may be lowered.
- In view of the foregoing and other problems, it is an object of the present invention to provide a liquid crystal display device.
- According to an example of the present invention, a liquid crystal display device includes a liquid crystal display panel, a heater, and a temperature detector. The liquid crystal display panel includes a first substrate, a second substrate opposing to the first substrate, a plurality of electrodes disposed between the first substrate and the second substrate, and liquid crystal sealed between the first substrate and the second substrate. The heater has a transparent heating member disposed opposite from the electrodes through the first substrate, and the heating member emits heat by being supplied with electricity. At least a part of the heating member is located to overlap with a display area of the liquid crystal display panel in a thickness direction of the substrates. The temperature detector has a temperature detecting portion. The temperature detecting portion of the temperature detector and the heating member of the heater are located adjacent to each other.
- Accordingly, a display quality of the liquid crystal display device can be improved.
- The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:
-
FIG. 1 is a schematic view illustrating a display device according to a first embodiment; -
FIG. 2 is an exploded perspective view illustrating a part of an annunciator of the display device; -
FIG. 3 is an exploded side view illustrating a part of the annunciator of the display device; -
FIG. 4 is a front view illustrating a liquid crystal panel of the annunciator; -
FIG. 5 is a back view illustrating the liquid crystal panel; -
FIG. 6 is a side view illustrating the liquid crystal panel; -
FIG. 7 is an enlarged cross-sectional view illustrating the liquid crystal panel ofFIG. 6 ; -
FIG. 8 is a circuit diagram illustrating a controlling of the display device; -
FIG. 9 is a flowchart illustrating a controlling of a heater of the liquid crystal panel; -
FIG. 10 is a flowchart illustrating an updating of an image displayed by the display device; -
FIG. 11 is a time chart illustrating the updating of the image; -
FIG. 12 is a time chart illustrating a response time period of liquid crystal of the liquid crystal panel; -
FIG. 13 is a graph illustrating a relationship between a liquid crystal temperature and the response time period, and a relationship between the liquid crystal temperature and an updating time period; -
FIG. 14A is an example of the image before updating,FIG. 14B is an example of the image during the updating, andFIG. 14C is an example of the image after the updating; -
FIG. 15 is a schematic view illustrating a first example arrangement of a resistance adjusting portion of a heating member of a display device according to a second embodiment; -
FIG. 16 is a schematic view illustrating a second example arrangement of a resistance adjusting portion of a heating member of a display device according to a second embodiment; -
FIG. 17 is an enlarged cross-sectional view illustrating a liquid crystal panel of a display device according to a third embodiment; -
FIG. 18 is an enlarged cross-sectional view illustrating a first example of a liquid crystal panel of a display device according to a fourth embodiment; and -
FIG. 19 is an enlarged cross-sectional view illustrating a second example of a liquid crystal panel of a display device according to a fourth embodiment. - A head-up display device (HUD) 1 according to a first embodiment is shown in
FIG. 1 . - The
HUD 1 is mounted on avehicle 2, and is located in aninstrument panel 4 disposed in a front area of apassenger compartment 3. Ameter 5 displays vehicle information, and theHUD 1 is disposed on a front side of themeter 5 in a front-and-rear direction of thevehicle 2. - The
HUD 1 includes anannunciator 10, areflecting mirror 11, and adustproof cover 12, for example. Theannunciator 10 forms an image of vehicle information. Themirror 11 introduces light of the image to a windshield 6 of thevehicle 2 through thecover 12. The windshield 6 is located on a frond side of thepassenger compartment 3. Thus, the light of the image incident on the windshield 6 forms an image on an inner surface of the windshield 6, and the formed image is displayed as a virtual image. -
FIG. 2 is an exploded perspective view illustrating a part of theannunciator 10 shown inFIG. 1 , andFIG. 3 is an exploded side view illustrating a part of theannunciator 10 shown inFIG. 1 . - The
annunciator 10 includes abacklight 20, aprojection lens 26, and aliquid crystal panel 30. - The
backlight 20 includes alight source 21, alight gathering lens 22, and adiffusion board 23, which are arranged in acasing 24. - The
light source 21 is a light-emitting diode, for example. Alternatively, thelight source 21 may be a xenon lamp, a fluorescent display tube, or a cold-cathode tube. Thelight source 21 is mounted on aprint board 25 provided for thelight source 21, and is electrically connected to acontroller 90 mounted on aprint board 80. As shown inFIG. 3 , thelight gathering lens 22 is a convex lens having a convex cross-section. Thelight source 21 emits light in a wide area, and thelight gathering lens 22 gathers the light so as to output the gathered light toward thediffusion board 23. Thediffusion board 23 has a light emitting face opposite from thelight gathering lens 22. Thediffusion board 23 diffuses the light output from thelight gathering lens 22, and outputs the diffused light toward theprojection lens 26 through the light emitting face. The light emitting face has a flat shape, and is able to emit uniform light having less luminance variation. - The
projection lens 26 is made of a material having high refractive index, such as resin. Theprojection lens 26 is located between thebacklight 20 and theliquid crystal panel 30. Light output from thediffusion board 23 is incident on theprojection lens 26 opposing to thebacklight 20. Theprojection lens 26 gathers light output from thebacklight 20, and projects the gathered light toward theliquid crystal panel 30. - The
liquid crystal panel 30 has ascreen 31 opposite from theprojection lens 26, and thescreen 31 forms an image corresponding to a signal output from outside. Theliquid crystal panel 30 is electrically connected to thecontroller 90 through theprint board 80 and aflexible print board 81. Thecontroller 90 forms a display signal, and sends the display signal toward theliquid crystal panel 30. Theliquid crystal panel 30 is a transmission-type panel, and is illuminated by transmitting light projected by theprojection lens 26. The transmitted light forms a display image on thescreen 31, and theliquid crystal panel 30 outputs the display image to themirror 11 shown inFIG. 1 . - The
liquid crystal panel 30 will be described with reference toFIGS. 4-7 .FIG. 4 is a front view of theliquid crystal panel 30 opposite from theprojection lens 26, andFIG. 5 is a back view of theliquid crystal panel 30 opposing to theprojection lens 26.FIG. 6 is a side view of theliquid crystal panel 30, andFIG. 7 is an enlarged cross-sectional view of theliquid crystal panel 30 shown in FIG. 6. - The
liquid crystal panel 30 is a double cell super twisted nematic (DSTN) type liquid crystal panel, for example. As shown inFIG. 6 , theliquid crystal panel 30 includes a liquidcrystal display panel 40, a compensatingpanel 60, and aheater 70. The liquidcrystal display panel 40 and the compensatingpanel 60 are connected to each other through an adhesive agent or an adhesive tape, for example. Theliquid crystal panel 30 is disposed such that the compensatingpanel 60 opposes to theprojection lens 26. - The liquid
crystal display panel 40 includes a firsttranslucent substrate 41, a secondtranslucent substrate 42, aspacer 45, andliquid crystal 46. Thefirst substrate 41 and thesecond substrate 42 oppose to each other. As shown inFIG. 4 , thetranslucent substrate FIG. 6 , thefirst substrate 41 opposes to the compensatingpanel 60, and an up-and-down dimension of thefirst substrate 41 is longer than that of thesecond substrate 42. - As shown in
FIG. 7 , thefirst substrate 41 has aprotrusion 43 protruding from a lower end of thesecond substrate 42. Thesecond substrate 42 has a first face opposing to thefirst substrate 41, and transparent electrodes are disposed between thefirst substrate 41 and thesecond substrate 42. Thesecond substrate 42 has a second face opposite from the first face, and apolarizing board 44 is disposed on the second face of thesecond substrate 42. That is, thepolarizing board 44 is disposed on a face of thescreen 31 of theliquid crystal panel 30. - As shown in
FIG. 7 , thespacer 45 is disposed between thetranslucent substrates second substrate 42. Theliquid crystal 46 is sealed in a space defined among thetranslucent substrates spacer 45. - The
translucent substrates first substrate 41 opposing to thesecond substrate 42 has thetransparent electrode 47, and a face of thesecond substrate 42 opposing to thefirst substrate 41 has thetransparent electrode 48. Theelectrode electrodes translucent substrate - The
protrusion 43 has a first terminal (not shown) connected to thetransparent electrodes protrusion 43 has a second terminal (not shown) connected to a center part of theflexible print board 81. A drivingcircuit 49 is mounted on theprotrusion 43. The drivingcircuit 49 receives a display signal generated in thecontroller 90 through theflexible print board 81 and the second terminal, and sends a driving signal corresponding to the display signal to thetransparent electrodes - The compensating
panel 60 includes a firsttranslucent substrate 61, a secondtranslucent substrate 62, aspacer 67, andliquid crystal 68. As shown inFIG. 5 , thetranslucent substrate first substrate 61 opposing to the liquidcrystal display panel 40 is longer than that of thesecond substrate 62. A left-and-right dimension of thefirst substrate 61 is longer than that of thesecond substrate 62. - As shown in
FIG. 5 , thefirst substrate 61 has afirst protrusion 63 protruding from a lower end of thesecond substrate 62. Thesecond substrate 62 further has asecond protrusion second substrate 62. Thesecond substrate 62 of the compensatingpanel 60 has approximately the same size as thesecond substrate 42 of the liquidcrystal display panel 40. Thetranslucent substrates polarizing board 66 is disposed on a face of thesecond substrate 62 opposite from thefirst substrate 61. - As shown in
FIG. 7 , thespacer 67 is disposed between thetranslucent substrates second substrate 62. Theliquid crystal 68 is sealed in a space defined among thetranslucent substrates spacer 67. - A
heating member 71 is disposed on a face of thefirst substrate 61 opposing to thesecond substrate 62, and is made of the same material as thetransparent electrode heating member 71 may be made of ITO, for example. Theheating member 71 is arranged all of the face of thefirst substrate 61 opposing to thesecond substrate 62. When electricity is supplied, theheating member 71 emits heat. Theliquid crystal 46 located in adisplay area 50 of the liquidcrystal display panel 40 shown inFIG. 4 can be approximately uniformly heated by theheating member 71. - The
heater 70 is constructed of the firsttranslucent substrate 61 and theheating member 71. Thefirst substrate 61 of the compensatingpanel 60 may be a supporting board for supporting theheating member 71. Because the firsttranslucent substrate 61 of the compensatingpanel 60 constructs a part of theheater 70 as the supporting board, a thickness of theliquid crystal panel 30 can be made thinner. Further, theheater 70 can be used for a different type liquid crystal display panel, in a case that theheater 70 is not integrated with the liquidcrystal display panel 40. However, theheater 70 may be integrated with the liquidcrystal display panel 40. - As shown in
FIG. 5 , aheater connector heating member 71 formed on thesecond protrusion heater connector heating member 71. Theheater connector heating member 71 through a conductive adhesive. - As shown in
FIG. 5 , theflexible print board 81 has acenter end portion 82, aright end portion 83, and aleft end portion 84, which are connected to theliquid crystal panel 30. Thecenter end portion 82 is connected to the drivingcircuit 49 shown inFIG. 4 . Theright end portion 83 is connected to theheater connector 73 through solder, and theleft end portion 84 is connected to theheater connector 74 through solder. - As shown in
FIG. 7 , theleft end portion 84 of theflexible print board 81 is disposed on theheating member 71 formed on thefirst protrusion 63. Athermistor 75 is connected to a face of theleft end portion 84 through an adhesive, for example. Thethermistor 75 may correspond to a temperature detector. Atemperature detecting portion 76 of thethermistor 75 opposes to theheating member 71, and is located adjacent to theheating member 71. Thethermistor 75 has a relatively small thermal capacity, and is used as a detector for measuring temperature. - Due to the location of the
thermistor 75, heat emitted from theheating member 71 can be immediately detected by thethermistor 75, compared with a case in which a thermistor is located on a translucent substrate of a liquid crystal panel. Theflexible print board 81 is thinner than a translucent substrate, and a thermal capacity of theflexible print board 81 is relatively smaller than that of a translucent substrate. - The
thermistor 75 is located adjacent to theheating member 71 arranged outside of thedisplay area 50 of the liquidcrystal display panel 40. Therefore, if theliquid crystal panel 30 is a transmission type panel, temperature can be detected without affecting an image displayed on theliquid crystal panel 30. - An end portion of the
heater connector 73 to be connected to theright end portion 83 of theflexible print board 81 is also disposed on theheating member 71 formed on thefirst protrusion 63. As shown inFIG. 5 , atemperature fuse 77 is arranged on a face of the end portion of theheater connector 73. Thetemperature fuse 77 and theheating member 71 are connected in series through theheater connector 73. In a case that a malfunction is generated in theheater 70 or thecontroller 90 controlling theheater 70, when theheating member 71 is overheated, thetemperature fuse 77 detects the overheat of theheating member 71. Thus, electricity supplied to theheating member 71 can be forcibly stopped. - As shown in
FIG. 8 , thecontroller 90 has amicrocomputer 91 for driving and controlling theHUD 1. Themicrocomputer 91 has a CPU, a RAM, and a ROM, for example. The CPU performs calculations so as to control theliquid crystal panel 30, thelight source 21, and theheater 70. The RAM temporally stores calculation results, temperature data output from thethermistor 75, switching instructions for turning on/off theHUD 1 input from outside, and a variety of vehicle information such as a vehicle velocity. Control programs necessary for controlling theHUD 1 is memorized in the ROM, and the CPU performs calculations based on the control programs. - A variety of sensors for obtaining vehicle information are connected to an input side of the
microcomputer 91 through an interface (not shown). The sensors output the vehicle information about thethermistor 75, the switching instructions of theHUD 1, and the vehicle velocity, for example. Thelight source 21 is connected to an output side of themicrocomputer 91. The liquidcrystal display panel 40 is connected to the output side of themicrocomputer 91 through the drivingcircuit 49. Theheater 70 is connected to the output side of themicrocomputer 91 through thetemperature fuse 77. - The
microcomputer 91 generates a display signal of a display image for theannunciator 10, and outputs the display signal into the drivingcircuit 49. When the drivingcircuit 49 receives the display signal, the drivingcircuit 49 controls electricity supply for thetransparent electrode translucent substrate microcomputer 91 generates a driving signal, and outputs the driving signal into a driving circuit (not shown) so as to make thelight source 21 to emit light. The driving circuit controls electricity supply for thelight source 21 based on the driving signal. Further, themicrocomputer 91 generates a driving signal for controlling theheater 70, and outputs the driving signal into a driving circuit (not shown). The driving circuit controls electricity supply for theheating member 71 of theheater 70 based on the driving signal. - A controlling of the
heater 70 of theHUD 1 will be described with reference toFIG. 9 . - When a switch of the
HUD 1 is turned on, thecontroller 90 starts a control flow shown inFIG. 9 , and performs a predetermined initialization at S10. - A liquid crystal temperature T is measured at S20. Specifically, the liquid crystal temperature T is measured based on temperature data input into the
controller 90 from thethermistor 75. Because the liquid crystal temperature T cannot directly be measured, the liquid crystal temperature T is estimated based on the temperature data input from thethermistor 75. - For example, a map or a calculation formula is prepared by performing experiments so as to define a relationship between the temperature data input from the
thermistor 75 and the liquid crystal temperature T. The prepared map or calculation formula is stored in the ROM of thecontroller 90. The estimation of the liquid crystal temperature T may be performed by using the map or the calculation formula. The liquid crystal temperature T may be measured by a single data input from thethermistor 75. Alternatively, an averaging process may be performed relative to multiple data. Accuracy for measuring the liquid crystal temperature T may be improved by multiple sampling of temperature data. - The measured liquid crystal temperature T is determined to be lower than a predetermined value such as 30° C. or not, at S30. The
annunciator 10 of theHUD 1 receives a variety of influences from the liquid crystal temperature T. For example, when the liquid crystal temperature T becomes low, response time period needed for displaying a display image on theannunciator 10 becomes long. If the display image is changed from a first image to a second image, the first image and the second image may overlap with each other during the response time period. For example, if information changing from moment to moment such as vehicle velocity is displayed as the display image, a vehicle driver may not be able to recognize the display image. - In contrast, when the liquid crystal temperature T becomes high, a contrast of the display image is lowered. Further, peripheral devices such as the
controller 90 may be affected. When the predetermined value is defined to be 30° C., a display quality can be maintained to be high relative to theliquid crystal 46. However, the predetermined value is not limited to 30° C., The predetermined value may be changed in consideration of temperature characteristics of liquid crystal. - When the liquid crystal temperature T is determined to be lower than the predetermined value (YES at S30), the
controller 90 outputs a driving signal for activating theheater 70 into the driving circuit of theheater 70, at S40. The driving circuit supplies electricity corresponding to the driving signal to theheating member 71. Thus, theheating member 71 emits heat corresponding to the supplied electricity so as to heat theliquid crystal 46. - When the liquid crystal temperature T is determined to be equal to or higher than the predetermined value (NO at S30), the
controller 90 stops outputting the driving signal so as to stop theheater 70, at S50. When thecontroller 90 stops outputting the driving signal into the driving circuit, the electricity supplied to theheating member 71 is stopped by the driving circuit. - When S40 or S50 is ended, a liquid crystal temperature T is again measured at S20. The control flow shown in
FIG. 9 is repeatedly performed until the switch of theHUD 1 is turned off. - The
thermistor 75 is located adjacent to theheating member 71 of theheater 70, not adjacent to the firsttranslucent substrate 41 of the liquidcrystal display panel 40. Thus, thethermistor 75 can immediately detect temperature increasing after theheating member 71 starts heating. Therefore, a response time period needed for thethermistor 75 to respond to the temperature increasing can be shortened, compared with a case in which the firsttranslucent substrate 41 having a relatively large thermal capacity is disposed between thethermistor 75 and theheating member 70. - Further, because the
temperature detecting portion 76 of thethermistor 75 is located adjacent to theheating member 71, thetemperature detecting portion 76 is difficult to be affected by outside air temperature. Thus, disturbance for thethermistor 75 can be reduced. Accordingly, detection accuracy of the liquid crystal temperature T can be improved. - Therefore, overheat of the
liquid crystal 46 can be restricted, because controllability of theheater 70 can be improved. Further, because the response time period of thethermistor 75 is shortened, when a heating amount of theheating member 71 is increased, theheater 70 can be controlled without overheating theliquid crystal 46. Thus, the liquid crystal temperature T can be rapidly increased to a proper range in accordance with the increased heating amount. Accordingly, a display quality of the liquidcrystal display panel 40 can be much improved. - Updating of an image displayed by the
HUD 1 will be described with reference toFIGS. 10-14 . -
FIG. 10 is a flowchart illustrating an updating of an image displayed by theHUD 1.FIG. 11 is a time chart illustrating the updating of the image.FIG. 12 is a time chart illustrating a display response time period RE0.FIG. 13 is a graph illustrating a relationship between the liquid crystal temperature T and the display response time period RE0, and a relationship between the liquid crystal temperature T and a display updating time period RN.FIG. 14A is an example of the image before updating,FIG. 14B is an example of the image during the updating, andFIG. 14C is an example of the image after the updating. - When a switch of the
HUD 1 is turned on, thecontroller 90 starts a control flow shown inFIG. 10 at an approximately the same timing as the control flow shown inFIG. 9 , and performs a predetermined initialization at s110. - The
controller 90 sends a display signal for displaying an image to the drivingcircuit 49, at S120. For example, information of a vehicle velocity V is input into theannunciator 10, and the image corresponds to the information of the vehicle velocity V. - A liquid crystal temperature T is measured at S130. Specifically, the liquid crystal temperature T is measured based on temperature data input into the
controller 90 from thethermistor 75. Because the liquid crystal temperature T cannot directly be measured, the liquid crystal temperature T is estimated based on the temperature data input from thethermistor 75. - For example, a map or a calculation formula is prepared by performing experiments so as to define a relationship between the temperature data input from the
thermistor 75 and the liquid crystal temperature T. The prepared map or calculation formula is stored in the ROM of thecontroller 90. The estimation of the liquid crystal temperature T may be performed by using the map or the calculation formula. The liquid crystal temperature T may be measured by a single data input from thethermistor 75. Alternatively, an averaging process may be performed relative to multiple data. Accuracy for measuring the liquid crystal temperature T may be improved by multiple sampling of temperature data. - The updating time period RN is determined in correspondence with the liquid crystal temperature T measured in S130, after S130 is performed. As shown in
FIG. 11 , the updating time period RN is defined as a time period started when a display of an image (n) is instructed and ended when a display of an image (n+1) is instructed. The updating time period RN is determined based on the response time period RE0. - The response time period RE0 and the updating time period RN will be specifically described.
-
FIG. 12 is a time chart representing a transmittance when the liquidcrystal display panel 40 is turned on/off. The transmittance is defined to be 100% when the liquidcrystal display panel 40 is stable after being turned on, and is defined to be 0% when the liquidcrystal display panel 40 is stable after being turned off. - As shown in a broken line of
FIG. 12 , after the liquidcrystal display panel 40 is turned off at a timing t1, the transmittance is gradually decreased to 0%. As shown in a solid line ofFIG. 12 , after the liquidcrystal display panel 40 is turned on at the timing t1, the transmittance is gradually increased to 100%. - A response time period RE1 represents a period started when the
panel 40 is turned off and ended when the transmittance is decreased to 10%, and a response time period RE2 represents a period started when thepanel 40 is turned on and ended when the transmittance is increased to 90%. When the period RE1 is longer than the period RE2, the response time period RE0 is equal to the period RE1. When the period RE2 is longer than the period RE1, the response time period RE0 is equal to the period RE2. InFIG. 12 , the response time period RE0 is equal to the period RE1, because the period RE1 is longer than the period RE2. - The response time period RE0 is changed in accordance with the liquid crystal temperature T. As shown in a broken line of
FIG. 13 , as the liquid crystal temperature T is lowered, the response time period RE0 is increased. As the liquid crystal temperature T is raised, the response time period RE0 is decreased. - As shown in
FIG. 11 , the updating time period RN is described as an example in a case that an image (n−1) is updated to an image (n). The display updating time period RN is defined to start when an erasion of the image (n−1) and a display of the image (n) are instructed. The display updating time period RN is defined to end when an erasion of the image (n) and a display of an image (n+1) are instructed. The instructions are sent by thecontroller 90 through the display signals. - The liquid crystal temperature T is determined to be lower than 7° C. or not, at S140 of
FIG. 10 . When the liquid crystal temperature T is determined to be lower than −7° C. (YES at S140), the flowchart proceeds to S150. In this case, as shown inFIG. 13 , the display response time period RE0 of theliquid crystal 46 is relatively long. - The display updating time period RN is set to be 1500 ms, at S150. After the display updating time period RN is set to be 1500 ms, a time period of 1500 ms is determined to elapse or not, at S160. If the time period of 1500 ms is determined not to elapse (NO at S160), S160 is repeatedly performed.
- If the time period of 1500 ms is determined to elapse (YES at S160), the flowchart returns to S120. The
annunciator 10 forms an image corresponding to information of a vehicle velocity V at the moment, at S120. Specifically, thecontroller 90 sends a signal instructing an erasion of the image (n−1) and a display of the image (n) into the drivingcircuit 49, such that the image (n−1) is updated to the image (n) corresponding to the vehicle velocity V at the moment, as shown inFIG. 11 . - When the liquid crystal temperature T is determined to be equal to or higher than −7° C. (NO at S140), the flowchart proceeds to S170.
- The liquid crystal temperature T is determined to be equal to or lower than 25° C. or not, at S170. When the liquid crystal temperature T is determined to be equal to or higher than −7° C. and when the liquid crystal temperature T is determined to be equal to or lower than 25° C. (YES at S170), the flowchart proceeds to S180.
- As shown in
FIG. 13 , the display updating time period RN is set to change in accordance with the liquid crystal temperature T. In a temperature range between −7° C. and 25° C., as shown inFIG. 11 , the display updating time period RN is defined by adding a predetermined extension period EXT to the response time period RE0. The updating time period RN is changed stepwise inFIG. 13 . Alternatively the updating time period RN may be changed not stepwise, if the updating time period RN is defined by adding the predetermined extension period EXT to the response time period RE0. - The display updating time period RN is stored in the ROM of the
microcomputer 91 of thecontroller 90. Alternatively, the display updating time period RN may be required by calculation. For example, in the temperature range between −7° C. and 25° C., the display response time period RE0 may be stored in the ROM, and the display updating time period RN may be defined by adding the predetermined extension period EXT to the display response time period RE0. - After the display updating time period RN is set at S180 of
FIG. 10 , the display updating time period RN is determined to elapse or not, at 5190. If the display updating time period RN is determined not to elapse (NO at S10), S190 is repeatedly performed. - If the display updating time period RN is determined to elapse (YES at S190), the flowchart returns to S120. The
annunciator 10 forms an image corresponding to information of a vehicle velocity V at the moment, at S120. - When the liquid crystal temperature T is determined to be higher than 25° C. (NO at S170), the flowchart proceeds to S200.
- The display updating time period RN is set to be 300 ms, at S200. After the updating time period RN is set to be 300 ms, a time period of 300 ms is determined to elapse or not, at S210. If the time period of 300 ms is determined not to elapse (NO at S210), S210 is repeatedly performed.
- If the time period of 300 ms is determined to elapse (YES at S210), the flowchart returns to S120. The
annunciator 10 forms an image corresponding to information of a vehicle velocity V at the moment, at S120. - Display state of the
annunciator 10 will be described in accordance with temperature ranges, when the control flow ofFIG. 10 is performed. - When the liquid crystal temperature T is equal to or higher than −7° C. and when the liquid crystal temperature T is equal to or lower than 25° C., the
liquid crystal 46 is relatively stable, and the display updating time period RN is defined by adding the predetermined extension period EXT to the display response time period RE0. - The image (n−1) and the image (n) are displayed in overlap state during the display response time period RE0 shown in
FIG. 11 , after the image (n−1) starts to be updated to the image (n). This is because the transmittance is in a range between 10% and 90% when theliquid crystal 46 is turned on/off, as shown inFIG. 12 . After the display response time period RE0 elapses, the image (n−1) is erased from theannunciator 10, such that only the image (n) is displayed in theannunciator 10 during the predetermined extension period EXT. Therefore, a vehicle driver can recognize the image (n) during the predetermined extension period EXT. - Only the image (n) is displayed during the predetermined extension period EXT, and the image (n−1) is not displayed during the predetermined extension period EXT. The predetermined extension period EXT has a length sufficient for the driver to be able to securely recognize the image (n). Specifically, when the predetermined extension period EXT is defined to be about 100 ms, for example, the driver can recognize display content displayed on the
annunciator 10. - For example, the image (n−1) before updating represents “4 km/h” shown in
FIG. 14A , and the image (n) after the updating represents “7 km/h” shown inFIG. 14C . The image (n−1) is changed to the image (n) through an overlap image shown inFIG. 14B . In the overlap image, “4 km/h” and “7 km/h” are overlap with each other on theannunciator 10. - During the display response time period RE0 shown in
FIG. 11 , theannunciator 10 displays the image shown inFIG. 14B . The vehicle driver cannot recognize the image shown inFIG. 14B . However, the image of “7 km/h” continues to be displayed during the extension period EXT after the display response time period RE0 elapses. Therefore, the vehicle driver can recognize the image of “7 km/h” during the extension period EXT. - Thus, the vehicle driver can recognize updated image without inserting a background image at the updating time. Further, because the background image is not inserted, display update interval can be made short, compared with a case in which the background image is inserted. Accordingly, vehicle information changing from moment to moment such as a vehicle velocity V can be properly displayed.
- As shown in
FIG. 13 , as the liquid crystal temperature T of theliquid crystal 46 is lowered, the response time period RE0 becomes long. As the temperature T of theliquid crystal 46 is raised, the response time period RE0 becomes short. - For example, when the liquid crystal temperature T is equal to −20° C. in
FIG. 13 , the response time period RE0 becomes equal to 3000 ms. If the display updating time period RN is defined by adding the predetermined extension period EXT to the display response time period RE0, a time period needed for updating the image (n−1) to the image (n) becomes too long. In this case, display performance may become worse for displaying information changing from moment to moment such as a vehicle velocity V. - Therefore, when the liquid crystal temperature T is in a low range, for example, when the liquid crystal temperature T is lower than −7° C., the updating time period RN is fixed to 1500 ms in spite of the response time period RE0. Even if the image (n−1) and the image (n) overlap with each other the vehicle driver can recognize the image (n), because the updating time period RN is relatively long. Thus, display quality can be improved without lowering display function, relative to information changing from moment to moment such as a vehicle velocity V, for example.
- When the liquid crystal temperature T is equal to 50° C. in
FIG. 13 , the response time period RE0 becomes smaller than 100 ms. If the display updating time period RN is defined by adding the predetermined extension period EXT to the display response time period RE0, the image (n−1) is too rapidly updated to the image (n), while an overlap time is short. In this case, it may be difficult for the vehicle driver to recognize content displayed on theannunciator 10. - Therefore, when the liquid crystal temperature T is in a high range, for example, when the liquid crystal temperature T is higher than 25° C., the updating time period RN is fixed to 300 ms in spite of the response time period RE0. Thus, the vehicle driver can properly recognize the updated image (n).
- Display quality of the updated image can be secured relative to the
annunciator 10 and theHUD 1, when the liquid crystal temperature T is in a predetermined range. Further, display quality of the updated image can be secured, if the liquid crystal temperature T is out of the predetermined range. - The
annunciator 10 of theHUD 1 is described as an example of the liquid crystal display device. Alternatively, the liquid crystal display device may be the liquidcrystal display panel 40, and the vehicle driver may directly recognize an image displayed on thepanel 40. - The
heating member 71 disposed on thetranslucent substrate 61 according to the first embodiment is modified in a second embodiment. According to the second embodiment, a part of theheating member 71 is removed, and aresistance adjusting portion 72 for limiting current passing through theheating member 71 is disposed in the removed part of theheating member 71. Thus, a heat emitting amount of theheating member 71 located adjacent to theresistance adjusting portion 72 can be controlled. -
FIG. 15 andFIG. 16 are front views illustrating thetranslucent substrate 61 having theheating member 71, which is seen from thelight source 21. - For example, as shown in
FIG. 15 , a part of theheating member 71 located adjacent to thethermistor 75, or theheating member 71 disposed on thefirst protrusion 63 is removed so as to form theresistance adjusting portion 72. When theheating member 71 corresponding to theresistance adjusting portion 72 is removed, current path located front and rear of the removed area is made narrow, such that a resistance value is made higher. - Thus, a heat emitting amount corresponding to an area of the
thermistor 75 is made smaller than a heat emitting amount corresponding to an area in which theheating member 71 is not removed. That is, a heat emitting amount of an area adjacent to thethermistor 75 is made smaller than a heat emitting amount of thedisplay area 50 shown in a chain line ofFIG. 15 . - As shown in
FIG. 16 , theheating member 71 located between thedisplay area 50 and theheater connector resistance adjusting portion 72. That is, theresistance adjusting portion 72 is located to sandwich thedisplay area 50. When theheating member 71 corresponding to theresistance adjusting portion 72 is removed, current path located front and rear of the removed area is made narrow, such that a resistance value is made higher. Thus, a heat emitting amount corresponding of thedisplay area 50 is made smaller than a heat emitting amount of an area adjacent to thethermistor 75. - As shown in
FIG. 15 andFIG. 16 , when theresistance adjusting portion 72 is formed in theheating member 71, the heat emitting amount of an area adjacent to thethermistor 75 or the heat emitting amount of thedisplay area 50 can be properly controlled. Thus, a relationship between a temperature increasing of theliquid crystal 46 and a temperature detected by thethermistor 75 can be properly controlled when electricity is supplied to theheating member 71. Therefore, the temperature detected by thethermistor 75 can correspond to the temperature of theliquid crystal 46, and accuracy for detecting the temperature of theliquid crystal 46 of the liquidcrystal display panel 40 can be improved. - A shadow may be generated by a borderline between the
heating member 71 and theresistance adjusting portion 72. However, because theresistance adjusting portion 72 is located outside of thedisplay area 50, the shadow is not generated on an image displayed on theannunciator 10 when light is illuminated from thelight source 21. - In a third embodiment, the
heater 70 and thethermistor 75 according to the first embodiment are applied to a twisted nematic (TN) type liquid crystal panel, or a thin film transistor (TFT) type liquid crystal panel.FIG. 17 is an enlarged cross-sectional view illustrating a TN type liquidcrystal display panel 40 a. - As shown in
FIG. 17 , aheater 70 is disposed on atranslucent substrate 41 a opposing to alight source 21. Atransparent electrode 47 a is disposed on a face of thetranslucent substrate 41 a, and aheating member 71 of theheater 70 is disposed on all of a face of thetranslucent substrate 41 a opposite from theelectrode 47 a. Atemperature detecting portion 76 of athermistor 75 is located adjacent to theheating member 71. Apolarization board 66 is disposed on theheating member 71 so as to oppose thelight source 21. Apolarization board 44 is disposed on atranslucent substrate 42 a opposite from thelight source 21. - The
heating member 71 of theheater 70 is disposed on thetranslucent substrate 41 a constructing the liquidcrystal display panel 40 a, thereby a thickness of theannunciator 10 can be made thinner. - In a fourth embodiment, the
heater 70 and thethermistor 75 according to the first embodiment are applied to a film super twisted nematic (FSTN) type liquid crystal panel.FIG. 18 is an enlarged cross-sectional view illustrating a FSTN type liquidcrystal display panel 40 b.FIG. 19 is an enlarged cross-sectional view illustrating an automotive super twisted nematic (ASTN) type liquidcrystal display panel 40 c, which is a kind of the FSTN type liquid crystal display panel. - As shown in
FIG. 18 , theFSTN type panel 40 b includestranslucent substrates polarization boards contrast films polarization board 66 is disposed on an outer face of thetranslucent substrate 41 b, and thepolarization board 44 is disposed on an outer face of thetranslucent substrate 42 b. The phase-contrast film 92 is arranged between thepolarization board 66 and thetranslucent substrate 41 b, and the phase-contrast film 93 is arranged between thepolarization board 44 and thetranslucent substrate 42 b. - The
heater 70 is disposed on thetranslucent substrate 41 b opposing to thelight source 21. Atransparent electrode 47 b is disposed on a face of thetranslucent substrate 41 b, and aheating member 71 of theheater 70 is disposed on all of a face of thetranslucent substrate 41 b opposite from theelectrode 47 b. Atemperature detecting portion 76 of thethermistor 75 is located adjacent to theheating member 71. - As shown in
FIG. 19 , theASTN type panel 40 c includes a compensatingfilm 94 located between atranslucent substrate 41 b and apolarization board 66. - A
heater 70 is disposed on thetranslucent substrate 41 b opposing to thelight source 21. Atransparent electrode 47 b is disposed on a face of thetranslucent substrate 41 b, and aheating member 71 of theheater 70 is disposed on all of a face of thetranslucent substrate 41 b opposite from theelectrode 47 b. Atemperature detecting portion 76 of thethermistor 75 is located adjacent to theheating member 71. - Such changes and modifications are to be understood as being within the scope of the present invention as defined by the appended claims.
Claims (11)
1. A liquid crystal display device comprising:
a liquid crystal display panel including
a first substrate and a second substrate opposing to the first substrate,
a plurality of electrodes disposed between the first substrate and the second substrate, and
liquid crystal sealed between the first substrate and the second substrate;
a heater having a transparent heating member disposed opposite to the electrodes through the first substrate, the heating member emitting heat by being supplied with electricity; and
a temperature detector having a temperature detecting portion, wherein
at least a part of the heating member is located to overlap with a display area of the liquid crystal display panel in a thickness direction of the substrates, and
the temperature detecting portion of the temperature detector and the heating member of the heater are located adjacent to each other.
2. The liquid crystal display device according to claim 1 , wherein
the heater further has a supporting board for supporting the heating member, and
the temperature detector is disposed on the heating member through the supporting board.
3. The liquid crystal display device according to claim 2 , further including
a compensating panel disposed adjacent to the first substrate of the liquid crystal display panel, wherein
the compensating panel has
a third substrate opposing to the liquid crystal display panel,
a fourth substrate located opposite to the liquid crystal display panel through the third substrate, and
liquid crystal sealed between the third substrate and the fourth substrate,
the supporting board of the heater is the third substrate of the compensating panel.
4. The liquid crystal display device according to claim 1 , wherein
the heating member is disposed on a face of the first substrate opposite from the electrodes, and
the temperature detector is disposed on the heating member opposite from the electrodes.
5. The liquid crystal display device according to claim 1 , wherein
the heating member is further located outside of the display area of the liquid crystal display panel in the thickness direction of the substrates, and
the temperature detector is disposed adjacent to the heating member located outside of the display area.
6. The liquid crystal display device according to claim 1 , wherein
the heating member covers at least entire face of the display area.
7. The liquid crystal display device according to claim 1 , wherein
the heating member has a resistance adjusting portion for limiting current flowing through the heating member corresponding to the display area or current flowing adjacent to the temperature detector.
8. The liquid crystal display device according to claim 7 , wherein
the resistance adjusting portion controls a resistance of the heating member by removing a part of the heating member.
9. The liquid crystal display device according to claim 7 , wherein
the heating member is further located outside of the display area of the liquid crystal display panel in the thickness direction of the substrates, and
the resistance adjusting portion controls a resistance of the heating member by removing a part of the heating member located outside of the display area.
10. The liquid crystal display device according to claim 1 , further comprising
a temperature fuse located adjacent to the heating member, wherein
the temperature fuse is connected to the heating member in series.
11. The liquid crystal display device according to claim 1 , wherein
the temperature detector is a thermistor.
Priority Applications (1)
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US13/422,655 US8488096B2 (en) | 2008-08-07 | 2012-03-16 | Liquid crystal display device with heater |
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JP2008204727A JP4623161B2 (en) | 2008-08-07 | 2008-08-07 | Liquid crystal display device |
JP2008-204727 | 2008-08-07 |
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US13/422,655 Division US8488096B2 (en) | 2008-08-07 | 2012-03-16 | Liquid crystal display device with heater |
Publications (1)
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US20100033654A1 true US20100033654A1 (en) | 2010-02-11 |
Family
ID=41652586
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US12/534,219 Abandoned US20100033654A1 (en) | 2008-08-07 | 2009-08-03 | Liquid crystal display device |
US13/422,655 Expired - Fee Related US8488096B2 (en) | 2008-08-07 | 2012-03-16 | Liquid crystal display device with heater |
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US13/422,655 Expired - Fee Related US8488096B2 (en) | 2008-08-07 | 2012-03-16 | Liquid crystal display device with heater |
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US10025095B2 (en) * | 2014-12-26 | 2018-07-17 | Panasonic Intellectual Property Management Co., Ltd. | Head-up display and mobile body equipped with head-up display |
CN109445153A (en) * | 2018-11-22 | 2019-03-08 | 中航华东光电有限公司 | A kind of special-shaped liquid crystal screen component for having low temperature and being evenly heated function |
Also Published As
Publication number | Publication date |
---|---|
US8488096B2 (en) | 2013-07-16 |
JP4623161B2 (en) | 2011-02-02 |
US20120176569A1 (en) | 2012-07-12 |
JP2010039386A (en) | 2010-02-18 |
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Owner name: DENSO CORPORATION,JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AOKI, NAOYUKI;REEL/FRAME:023041/0265 Effective date: 20090721 |
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