US20040228105A1 - Back light module - Google Patents
Back light module Download PDFInfo
- Publication number
- US20040228105A1 US20040228105A1 US10/249,889 US24988903A US2004228105A1 US 20040228105 A1 US20040228105 A1 US 20040228105A1 US 24988903 A US24988903 A US 24988903A US 2004228105 A1 US2004228105 A1 US 2004228105A1
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- US
- United States
- Prior art keywords
- light
- direct
- sheet
- type
- light source
- 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.)
- Granted
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
Abstract
Description
- The
light source generator 14 is utilized for providing a light source, and the reflecting sheet is utilized for upwardly reflecting the light source generated by the light source generator 1 4 and thereby increase the light use efficiency of theback light module 10. The light guide plate 1 8 is utilized for scattering the light source to thediffusing plate 16, and thediffusing plate 16 is employed for further scattering the light source to thedisplay panel 12. Thehousing 22 disposed under the reflectingsheet 20 is utilized to assemble thediffusing plate 16, thelight guide plate 18, the reflectingsheet 20 and thelight source generator 14. In addition, thediffusing plate 16 further comprises at least oneprism 24 disposed on a surface of thediffusing plate 16 to reduce the difference of the luminous intensities on thedisplay panel 12 in advance. The quantity and placing order of theprism 24 employed are defined by the specification of theback light module 10. - Generally, the
light source generator 14 is a cold cathode fluorescent lamp (CCFL), and the plurality of thelight source generator 14 is arranged in parallel. As technologies progress, the brightness of thelight source generators 14 turns to be higher and higher due to market demand. However, the improved brightness of thelight source generator 14 frequently causes light gratings appeared on thedisplay panel 12, leading to the unbalanced brightness of thedisplay panel 12, which is called a light bleed-through phenomenon. Moreover, this light bleed-through phenomenon would cause defective display function of thedisplay panel 12 under the long-time operation of theback light module 10, making the back light module 10 a less-competitive product. - It is therefore a primary object of the present invention to provide a back light module to prevent the defective function of the back light module caused by the light bleed-through phenomenon described in the prior art.
- According to the claimed invention, the back light module is disposed under a display panel and comprises a diffusing plate, at least one light source generator, a prism, a light guide plate (LGP), at least one light shading sheet, and a reflecting sheet. The light source generator is utilized for generating a light source, and the diffusing plate is disposed between the light source generator and the display panel. The prism is disposed on a surface of the diffusing plate, and the light guide plate is disposed between the light source generator and the diffusing plate. The light guide plate is utilized for scattering the light source to the diffusing plate, and the diffusing plate is utilized for scattering the light source to the display panel. The reflecting sheet is disposed under the light source generator and is utilized for upwardly reflecting the light source to the light guide plate. The light shading sheet is a semi-transparent sheet disposed between the light source generator and the light guide plate and comprises a plurality of light holes.
- It is an advantage of the present invention against the prior art that the light source in the present invention is generated by the light source generator and then scattered through a plurality of light holes of the light shading sheet to the light guide plate, assuring an uniform brightness of the scattered light source and thus preventing the light bleed-through phenomenon. Alternatively, the light holes can be neglected in case that the light shading sheet is composed of a semi-transparent sheet for the simplification of the manufacturing processes of the back light module. Consequently, the display quality of the back light module is assured by the use of the light shading sheet, making the back light module a more competitive product.
- These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment, which is illustrated in the multiple figures and drawings.
- FIG. 1 is a cross-sectional view of a back light module according to the prior art.
- FIG. 2 is the cross-sectional view of a back light module according to the present invention.
- FIG. 3 is an enlarged schematic view of the
light shading sheet 52 in FIG. 2. - Please refer to FIG. 2 of a cross-sectional view of a
back light module 40 according to the present invention. As shown in FIG. 2, theback light module 40 is disposed under adisplay panel 42 and comprises at least onelight source generator 44, adiffusing plate 46 disposed between thelight source generator 44 and thedisplay panel 42, at least oneprism 48 disposed on a surface of thediffusing plate 46, a light guide plate (LGP) 50 disposed between thelight source generator 44 and thediffusing plate 46, at least onlight shading sheet 52 disposed between thelight source generator 44 and thelight guide plate 50, a reflectingsheet 54 disposed under thelight source generator 44, and ahousing 56 disposed under the reflectingsheet 54 for surrounding the reflectingsheet 54. - As shown in FIG. 2, the
light source generators 44 are lamps utilized for providing alight source 45 and are arranged in parallel. In the preferred embodiment of the present invention, eachlight source generator 44 is a cold cathode fluorescent lamp (CCFL). The reflectingsheet 54, composed of either aluminum (Al) or metal alloy, comprises at least oneopening 58, which is capable of dissipating heat generated during the operation of theback light module 40, and is utilized for reflecting thelight source 45 to thelight shading sheet 52 and further to thelight guide plate 50. Alternatively, in another embodiment of the present invention, the reflectingsheet 54 is composed of a stacked film, comprising an upper sheet composed of either a metal sheet or other materials having a high light transmission ratio and a bottom sheet composed of either foamed polyethylene terephthalate (foamed PET) or polycarbonate (PC). - The
light guide plate 50 is utilized for scattering thelight source 45 generated by thelight source generator 44 to thediffusing plate 46, and thediffusing plate 46 is utilized for further scattering thelight source 45 to thedisplay panel 42. In the preferred embodiment of the present invention, thelight shading sheet 52 and thelight guide plate 50 are simultaneously formed by an injection molding method. Alternatively, thelight shading sheet 52 and thelight guide plate 50 are separately formed and are then combined by an adhesion glue. Theprism 48 disposed on thediffusing plate 46 is employed to reduce the difference of the luminous intensities on thedisplay panel 42 in advance, and the quantity and placing order of theprism 48 employed are defined by the specification of theback light module 40. Thehousing 56 comprises a plurality ofheat vents 60 to reinforce the heat dissipation of theback light module 40 during operation. - Please refer to FIG. 3 of an enlarged schematic view of the
light shading sheet 52 shown in FIG. 2. As shown in FIG. 3, thelight shading sheet 52 has an arc shape and is capable of covering the plurality of thelight source generators 44, and thelight guide plate 50 has a curved shape corresponding to the arc shape of thelight shading sheet 52. In addition, thelight shading sheet 52 comprises a plurality oflight holes 62 for the scattering of thelight source 45 either generated by thelight source generator 44 or reflected by the reflectingsheet 54 through the path marked by the arrows shown in FIG. 3 to thelight guide plate 50. Normally, thelight shading sheet 52 is composed of either a semi-transparent sheet or a metal sheet. In case that thelight shading sheet 52 is composed of a semi-transparent sheet, the plurality oflight holes 62 can be neglected for the transparency of the semi-transparent sheet. Alternatively, thelight shading sheet 52 is further employed as a reflecting film for reflecting thelight source 45 generated by thelight source generator 44 to the reflectingsheet 54 in case that thelight shading sheet 52 is composed of a metal sheet. Thereflected light source 45 is then further reflected by the reflectingsheet 54 upwardly through the path shown by the arrows in FIG. 2 to thelight guide plate 50. - As mentioned in preceding paragraphs in the prior art, the brightness of light source generators is much improved as technologies progress due to market demand, frequently leading to light gratings appeared on the display panel during the operation of the back light module, which is called light bleed-through phenomenon, due to the unbalanced brightness of the light source generated by the light source generators. The
light shading sheet 52 is therefore revealed in the present invention to prevent the light bleed-through phenomenon. In comparison with the light source in the prior art, thelight source 45 in the present invention is generated by thelight source generator 44 and then scattered through thelight holes 62 of thelight shading sheet 52 to thelight guide plate 50, assuring an uniform brightness of thescattered light source 45 and thus preventing the light bleed-through phenomenon. Alternatively, thelight holes 62 can be neglected in case that thelight shading sheet 52 is composed of a semi-transparent sheet for the simplification of the manufacturing processes of theback light module 40. Consequently, the display quality of theback light module 40 is assured by the use of thelight shading sheet 52, making the back light module 40 a more competitive product. - Those skilled in the art will readily observe that numerous modifications and alterations of the device may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bound of the appended claims.
Claims (14)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/249,889 US6814456B1 (en) | 2003-05-15 | 2003-05-15 | Back light module |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/249,889 US6814456B1 (en) | 2003-05-15 | 2003-05-15 | Back light module |
Publications (2)
Publication Number | Publication Date |
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US6814456B1 US6814456B1 (en) | 2004-11-09 |
US20040228105A1 true US20040228105A1 (en) | 2004-11-18 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/249,889 Expired - Fee Related US6814456B1 (en) | 2003-05-15 | 2003-05-15 | Back light module |
Country Status (1)
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US (1) | US6814456B1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060072300A1 (en) * | 2004-10-05 | 2006-04-06 | Alps Electric Co., Ltd. | Illumination device |
US20070053175A1 (en) * | 2003-09-04 | 2007-03-08 | Koninklijke Philips Electronics N.V. | Illumination system and display device |
WO2012009506A2 (en) * | 2010-07-15 | 2012-01-19 | American Panel Corporation | Shaped reflectors for enhanced optical diffusion in backlight assemblies |
KR101263502B1 (en) * | 2006-03-27 | 2013-05-13 | 엘지디스플레이 주식회사 | Light Emitting Diode Back Light Unit and Liquid Crystal Display Device having thereof |
WO2018194869A1 (en) * | 2017-04-17 | 2018-10-25 | Versalume, Llc | Apparatus and methods for lighting an ice rink using a light diffusing optical fiber |
WO2020101946A1 (en) * | 2018-11-12 | 2020-05-22 | Corning Incorporated | Backlight including patterned reflectors, diffuser plate, and method for fabricating the backlight |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI232337B (en) * | 2003-11-10 | 2005-05-11 | Au Optronics Corp | Direct type backlight module |
JP4438441B2 (en) * | 2004-02-16 | 2010-03-24 | 日本電気株式会社 | Illumination device and display device including the same |
US7077547B2 (en) * | 2004-07-29 | 2006-07-18 | Nordson Corporation | Shuttered lamp assembly and method of cooling the lamp assembly |
TWI296733B (en) * | 2005-03-03 | 2008-05-11 | Au Optronics Corp | Bottom-lighting module |
TW200638121A (en) * | 2005-04-29 | 2006-11-01 | Coretronic Corp | The backlighting module |
US7350954B2 (en) * | 2005-08-01 | 2008-04-01 | Delphi Technologies, Inc. | Display apparatus |
KR101212137B1 (en) * | 2005-08-05 | 2012-12-14 | 엘지디스플레이 주식회사 | backlight unit |
CN100432747C (en) * | 2006-02-08 | 2008-11-12 | 中华映管股份有限公司 | Back lighting module and lighting mixed module there of |
TWI334050B (en) * | 2006-07-21 | 2010-12-01 | Coretronic Corp | Backlight module |
TWM305360U (en) * | 2006-08-31 | 2007-01-21 | K Bridge Electronics Co Ltd | Improved structure of backlight module |
US8047696B2 (en) * | 2006-10-16 | 2011-11-01 | Koninklijke Philips Electronics N.V. | Luminaire arrangement with cover layer |
JP2008103150A (en) * | 2006-10-18 | 2008-05-01 | Mitsubishi Electric Corp | Surface light source device |
WO2008144650A1 (en) * | 2007-05-20 | 2008-11-27 | 3M Innovative Properties Company | Collimating light injectors for edge-lit backlights |
KR101488042B1 (en) | 2007-05-20 | 2015-01-29 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Design parameters for thin hollow cavity backlights of the light-recycling type |
TWI467283B (en) | 2007-05-20 | 2015-01-01 | 3M Innovative Properties Co | Recycling backlights with semi-specular components |
EP2535766A3 (en) | 2007-05-20 | 2013-05-01 | 3M Innovative Properties Company | Asymmetric reflective film and backlight having a hollow cavity, which recycles the light |
JP5702151B2 (en) | 2008-02-07 | 2015-04-15 | スリーエム イノベイティブ プロパティズ カンパニー | Hollow backlight with structured film |
US9541698B2 (en) | 2008-02-22 | 2017-01-10 | 3M Innovative Properties Company | Backlights having selected output light flux distributions and display systems using same |
EP2297607B1 (en) | 2008-06-04 | 2014-04-23 | 3M Innovative Properties Company | Hollow backlight with tilted light source |
JP2011060594A (en) * | 2009-09-10 | 2011-03-24 | Fujitsu Ltd | Illumination unit, device, and method of manufacturing the same |
CN103486480B (en) * | 2013-09-29 | 2016-05-11 | 青岛海信电器股份有限公司 | A kind of backlight module and display unit |
CN104089220B (en) * | 2014-06-30 | 2017-01-25 | 京东方科技集团股份有限公司 | Straight down type backlight source module |
US9715058B1 (en) * | 2016-08-30 | 2017-07-25 | Bolb Inc. | Ultraviolet light device |
CN110687710A (en) * | 2019-09-24 | 2020-01-14 | 武汉华星光电技术有限公司 | Display device |
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US4642736A (en) * | 1984-07-02 | 1987-02-10 | Mitsubishi Rayon Company, Ltd. | Light diffuser |
US4738042A (en) * | 1986-10-17 | 1988-04-19 | Specialty Equipment Co., Inc. | Integral moving message device for merchandising display case |
US4860171A (en) * | 1987-10-20 | 1989-08-22 | T. Chatani & Co., Ltd. | Surface illuminating apparatus |
US5730484A (en) * | 1996-08-30 | 1998-03-24 | Robinson; James Carl | Adjustable automobile shade |
US5961197A (en) * | 1995-12-14 | 1999-10-05 | Enplas Corporation | Surface light source device |
US6527426B2 (en) * | 2000-04-26 | 2003-03-04 | Stanley Electric Co., Ltd | Vehicle lamp |
US20030086265A1 (en) * | 2001-10-09 | 2003-05-08 | Seiko Epson Corporation | Lighting apparatus and projection type display, and driving method therefore |
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2003
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US4642736A (en) * | 1984-07-02 | 1987-02-10 | Mitsubishi Rayon Company, Ltd. | Light diffuser |
US4738042A (en) * | 1986-10-17 | 1988-04-19 | Specialty Equipment Co., Inc. | Integral moving message device for merchandising display case |
US4860171A (en) * | 1987-10-20 | 1989-08-22 | T. Chatani & Co., Ltd. | Surface illuminating apparatus |
US5961197A (en) * | 1995-12-14 | 1999-10-05 | Enplas Corporation | Surface light source device |
US5730484A (en) * | 1996-08-30 | 1998-03-24 | Robinson; James Carl | Adjustable automobile shade |
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US20030086265A1 (en) * | 2001-10-09 | 2003-05-08 | Seiko Epson Corporation | Lighting apparatus and projection type display, and driving method therefore |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070053175A1 (en) * | 2003-09-04 | 2007-03-08 | Koninklijke Philips Electronics N.V. | Illumination system and display device |
US20060072300A1 (en) * | 2004-10-05 | 2006-04-06 | Alps Electric Co., Ltd. | Illumination device |
KR101263502B1 (en) * | 2006-03-27 | 2013-05-13 | 엘지디스플레이 주식회사 | Light Emitting Diode Back Light Unit and Liquid Crystal Display Device having thereof |
WO2012009506A2 (en) * | 2010-07-15 | 2012-01-19 | American Panel Corporation | Shaped reflectors for enhanced optical diffusion in backlight assemblies |
WO2012009506A3 (en) * | 2010-07-15 | 2012-04-12 | American Panel Corporation | Shaped reflectors for enhanced optical diffusion in backlight assemblies |
WO2018194869A1 (en) * | 2017-04-17 | 2018-10-25 | Versalume, Llc | Apparatus and methods for lighting an ice rink using a light diffusing optical fiber |
WO2020101946A1 (en) * | 2018-11-12 | 2020-05-22 | Corning Incorporated | Backlight including patterned reflectors, diffuser plate, and method for fabricating the backlight |
US11709397B2 (en) * | 2018-11-12 | 2023-07-25 | Corning Incorporated | Backlight including patterned reflectors, diffuser plate, and method for fabricating the backlight |
Also Published As
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US6814456B1 (en) | 2004-11-09 |
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Owner name: TOPPOLY OPTOELECTRONICS CORP., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HUANG, HUA-NAN;MAI, CHE-KUEI;REEL/FRAME:013654/0020 Effective date: 20030505 |
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