US20040114348A1 - Backlight module with light guide plate having concave light input surface - Google Patents
Backlight module with light guide plate having concave light input surface Download PDFInfo
- Publication number
- US20040114348A1 US20040114348A1 US10/731,043 US73104303A US2004114348A1 US 20040114348 A1 US20040114348 A1 US 20040114348A1 US 73104303 A US73104303 A US 73104303A US 2004114348 A1 US2004114348 A1 US 2004114348A1
- Authority
- US
- United States
- Prior art keywords
- light
- backlight module
- input surface
- guide plate
- light guide
- 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
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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
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
-
- 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
-
- 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
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
Definitions
- the present invention relates to a backlight module, and particularly to one used in a liquid crystal display (LCD).
- LCD liquid crystal display
- a backlight type LCD In a backlight type LCD, light beams are applied to a display member from the rear of the display member. Portions of the display member selectively allow transmission of the light beams therethrough, while other portions are opaque and prevent transmission of the light beams. The transmitted light beams are seen by an observer as displayed information. Important characteristics of the LCD include its long working lifetime, low power consumption, and brightness and uniformity of the emitted light rays. High brightness and uniform illumination help an LCD provide good display performance.
- a conventional backlight module 1 comprises a light source group 11 and a light guide plate 12 .
- the light source group 11 comprises several light emitting diodes (LEDs) (not labeled).
- the light guide plate 12 has a light input surface 121 and a light output surface 122 . Because each LED emits light over a certain range of angles, a scope of illumination 13 of the light source group 11 is the sum of the contributions of each LED's output light. Nevertheless, the illumination scope generally cannot cover the whole light guide plate 12 .
- the hatched areas 14 in FIG. 6 show parts of the light guide plate 12 that are not illuminated. These parts are known as ‘dark zones.’ The existence of dark zones diminishes the performance of the backlight module 1 .
- the backlight module 2 comprises a light source group 21 and a light guide plate 22 .
- the light source group 21 comprises three light emitting diodes (LEDs, not labeled), and the light guide plate 22 has a light input surface 221 and a light output surface 222 .
- the light input surface 221 defines three U-shaped grooves, each matching with a corresponding LED.
- each LED faces a concave surface of the corresponding U-shaped groove, and light beams passing through the concave surface cover a larger area of the light guide plate 22 in comparison with the above-described backlight module 1 . Even so, the backlight module 2 still exhibits dark zones 24 .
- An object of the present invention is to provide a backlight module which enjoys full illumination of a light guide plate thereof, there being no dark zones in the light guide plate.
- a backlight module of present invention comprises a light source group and a light guide plate.
- the light source group comprises a plurality of point light sources such as LEDs.
- the light guide plate has a light input surface for receiving light, and a light output surface for emitting light.
- the light source group faces the light input surface.
- the light input surface is curved such that it matches a distribution of light of the light source group.
- the light input surface matches the light distribution of the light source group, divergent light emitted from the light source group reaches the entire light input surface.
- the light guide plate is entirely illuminated, and has no dark zones.
- FIG. 1 is a top elevation of a backlight module according to a first embodiment of the present invention
- FIG. 2 is similar to FIG. 1, but schematically shows a scope of illumination of the backlight module
- FIG. 3 is an isometric view of a backlight module according to a second embodiment of the present invention.
- FIG. 4 is an exploded, front elevation of a backlight module according to a third embodiment of the present invention.
- FIG. 5 is an exploded, isometric view of a backlight module according to a fourth embodiment of the present invention.
- FIG. 6 is a top elevation of a conventional backlight module, schematically showing a scope of illumination thereof;
- FIG. 7 is an exploded, isometric view of another conventional backlight module.
- FIG. 8 is substantially an assembled, top elevation of the backlight module of FIG. 7, schematically showing a scope of illumination thereof.
- a backlight module 3 according to the first embodiment of the present invention comprises a light source group 31 and a light guide plate 32 .
- the light source group 31 comprises three point light sources such as LEDs (not labeled).
- the light guide plate 32 is generally parallelepiped-shaped, and has a light input surface 321 for receiving light and an opposite light output surface 322 for emitting light.
- the light source group 31 faces the light input surface 321 .
- the light output surface 322 is a plane surface.
- the light input surface 321 is spherically concave. That is, a top elevation of the light guide plate 32 shows the light input surface 321 having an arcuate profile (see FIG. 1), and a side elevation of the light guide plate 32 also shows the light input surface 321 having an arcuateaccurate profile.
- the spherically concave configuration of the light input surface 321 matches an overall distribution of light emitted from the light source group 31 . That is, divergent light beams emitted from the LEDs of the light source group 31 reach every part of the light input surface 321 , and thus every region in the light guide plate 32 .
- a scope of illumination 33 as represented by overlapping ovals in FIG. 2 covers the whole light guide plate 32 , and the light guide plate 32 has no dark zones.
- a backlight module 4 uses a generally wedge-shaped light guide plate 42 .
- the backlight module 4 is similar to the backlight module 3 of the first embodiment.
- the backlight module 4 further comprises a light source group 41
- the light guide plate 42 comprises a light input surface 421 and a light output surface 422 .
- the light input surface 421 is spherically concave, so that a curvature of the light input surface 421 matches an overall distribution of light distribution emitted from the light source group 41 .
- Divergent light beams emitted from LEDs of the light source group 41 reach every region in the light guide plate 42 , so that the light guide plate 42 has no dark zones.
- a backlight module 5 comprises a diffusing plate 56 and a brightness enhancing film 57 , in addition to a light guide plate 52 and a light source group 51 .
- the diffusing plate 56 is disposed between the brightness enhancing film 57 and the light guide plate 52 , to receive and diffuse light beams emitted from a light output surface 522 of the light guide plate 52 . The diffused light beams then enter the brightness enhancing film 57 .
- the light guide plate 52 also has a light input surface 521 opposite to the light output surface 522 , to receive light emitted from the light source group 51 .
- the light source group 51 comprises four point light sources such as LEDs (not labeled).
- the light output surface 522 is opposite to the light input surface 521 .
- a backlight module 6 according to a fourth embodiment of the present invention comprises a reflecting plate 65 , a diffusing plate 66 and a brightness enhancing film 67 , in addition to a light guide plate 62 and a light source group 61 .
- the reflecting plate 65 is disposed adjacent a bottom surface 623 of the light guide plate 62 , which is opposite to a top light output surface 622 of the light guide plate 62 .
- the diffusing plate 66 is disposed between the brightness enhancing film 67 and the light guide plate 62 .
- the light source group 61 comprises three point light sources such as LEDs (not labeled).
- each backlight module 3 , 4 , 5 , 6 has a spherically concave light input surface 321 , 421 , 521 , 621 , whose curvature matches light distribution of the light source group 31 , 41 , 51 , 61 . Because the divergent light beams emitted from the light source group 31 , 41 , 51 , 61 reach every part of the light input surface 321 , 421 , 521 , 621 , the whole light guide plate 32 , 42 , 52 , 62 is illuminated and has no dark zones.
- the brightness enhancing film 57 , 67 can be replaced by a prism plate instead.
- the backlight module of the present invention may take forms other than the embodiments described above.
- a linear light source may be used instead of a light source group comprising point light sources.
- the light input surface may be configured accordingly.
- the light input surface instead of being spherically concave, the light input surface may be cylindrically concave. That is, a top elevation of the light guide plate shows the light input surface having a linear profile, and a side elevation of the light guide plate shows the light input surface having an arcuate profile. Still other types of light input surfaces may be configured according to need. Further, two or several light input surfaces may be employed instead of only one light input surface. Yet, another alternation may include to keep the light input surface straight while arranging the group of light sub-sources to disperse in a concave manner.
Abstract
A backlight module (3) includes a light source group (31) and a light guide plate (32). The light source group includes at least a light sources (not labeled), the light guide plate has a light input surface (321) for receiving light and a light output surface (322) for emitting light. The light source group faces the light input surface, which is a curved and its curvature matches with the light distribution of the light source group.
Description
- 1. Field of the Invention
- The present invention relates to a backlight module, and particularly to one used in a liquid crystal display (LCD).
- 2. Description of Prior Art
- In a backlight type LCD, light beams are applied to a display member from the rear of the display member. Portions of the display member selectively allow transmission of the light beams therethrough, while other portions are opaque and prevent transmission of the light beams. The transmitted light beams are seen by an observer as displayed information. Important characteristics of the LCD include its long working lifetime, low power consumption, and brightness and uniformity of the emitted light rays. High brightness and uniform illumination help an LCD provide good display performance.
- Referring to FIG. 6, a
conventional backlight module 1 comprises alight source group 11 and alight guide plate 12. Thelight source group 11 comprises several light emitting diodes (LEDs) (not labeled). Thelight guide plate 12 has alight input surface 121 and alight output surface 122. Because each LED emits light over a certain range of angles, a scope ofillumination 13 of thelight source group 11 is the sum of the contributions of each LED's output light. Nevertheless, the illumination scope generally cannot cover the wholelight guide plate 12. The hatchedareas 14 in FIG. 6 show parts of thelight guide plate 12 that are not illuminated. These parts are known as ‘dark zones.’ The existence of dark zones diminishes the performance of thebacklight module 1. - Referring to FIG. 7 and FIG. 8, China Patent No. 98206129 issued on Nov. 10, 1999 discloses another kind of backlight module2. The backlight module 2 comprises a
light source group 21 and alight guide plate 22. Thelight source group 21 comprises three light emitting diodes (LEDs, not labeled), and thelight guide plate 22 has alight input surface 221 and alight output surface 222. Thelight input surface 221 defines three U-shaped grooves, each matching with a corresponding LED. Thus each LED faces a concave surface of the corresponding U-shaped groove, and light beams passing through the concave surface cover a larger area of thelight guide plate 22 in comparison with the above-describedbacklight module 1. Even so, the backlight module 2 still exhibitsdark zones 24. - It is desired to provide a backlight system and a light guide plate used therein which overcome the above-described problems.
- An object of the present invention is to provide a backlight module which enjoys full illumination of a light guide plate thereof, there being no dark zones in the light guide plate.
- To achieve the above object, a backlight module of present invention comprises a light source group and a light guide plate. The light source group comprises a plurality of point light sources such as LEDs. The light guide plate has a light input surface for receiving light, and a light output surface for emitting light. The light source group faces the light input surface. The light input surface is curved such that it matches a distribution of light of the light source group.
- Because the light input surface matches the light distribution of the light source group, divergent light emitted from the light source group reaches the entire light input surface. Thus the light guide plate is entirely illuminated, and has no dark zones.
- Other objects, advantages, and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
- FIG. 1 is a top elevation of a backlight module according to a first embodiment of the present invention;
- FIG. 2 is similar to FIG. 1, but schematically shows a scope of illumination of the backlight module;
- FIG. 3 is an isometric view of a backlight module according to a second embodiment of the present invention;
- FIG. 4 is an exploded, front elevation of a backlight module according to a third embodiment of the present invention;
- FIG. 5 is an exploded, isometric view of a backlight module according to a fourth embodiment of the present invention;
- FIG. 6 is a top elevation of a conventional backlight module, schematically showing a scope of illumination thereof;
- FIG. 7 is an exploded, isometric view of another conventional backlight module; and
- FIG. 8 is substantially an assembled, top elevation of the backlight module of FIG. 7, schematically showing a scope of illumination thereof.
- Referring to FIG. 1 and FIG. 2, a
backlight module 3 according to the first embodiment of the present invention comprises alight source group 31 and alight guide plate 32. Thelight source group 31 comprises three point light sources such as LEDs (not labeled). Thelight guide plate 32 is generally parallelepiped-shaped, and has alight input surface 321 for receiving light and an oppositelight output surface 322 for emitting light. Thelight source group 31 faces thelight input surface 321. Thelight output surface 322 is a plane surface. Thelight input surface 321 is spherically concave. That is, a top elevation of thelight guide plate 32 shows thelight input surface 321 having an arcuate profile (see FIG. 1), and a side elevation of thelight guide plate 32 also shows thelight input surface 321 having an arcuateaccurate profile. - The spherically concave configuration of the
light input surface 321 matches an overall distribution of light emitted from thelight source group 31. That is, divergent light beams emitted from the LEDs of thelight source group 31 reach every part of thelight input surface 321, and thus every region in thelight guide plate 32. Thus a scope ofillumination 33 as represented by overlapping ovals in FIG. 2 covers the wholelight guide plate 32, and thelight guide plate 32 has no dark zones. - Referring to FIG. 3, a
backlight module 4 according to a second embodiment of the present invention uses a generally wedge-shapedlight guide plate 42. In other respects, thebacklight module 4 is similar to thebacklight module 3 of the first embodiment. Thebacklight module 4 further comprises alight source group 41, and thelight guide plate 42 comprises alight input surface 421 and alight output surface 422. Thelight input surface 421 is spherically concave, so that a curvature of thelight input surface 421 matches an overall distribution of light distribution emitted from thelight source group 41. Divergent light beams emitted from LEDs of thelight source group 41 reach every region in thelight guide plate 42, so that thelight guide plate 42 has no dark zones. - Referring to FIG. 4, a
backlight module 5 according to a third embodiment of the present invention comprises adiffusing plate 56 and abrightness enhancing film 57, in addition to alight guide plate 52 and alight source group 51. Thediffusing plate 56 is disposed between thebrightness enhancing film 57 and thelight guide plate 52, to receive and diffuse light beams emitted from alight output surface 522 of thelight guide plate 52. The diffused light beams then enter thebrightness enhancing film 57. Thelight guide plate 52 also has alight input surface 521 opposite to thelight output surface 522, to receive light emitted from thelight source group 51. Thelight source group 51 comprises four point light sources such as LEDs (not labeled). Unlike in thebacklight modules backlight module 5 thelight output surface 522 is opposite to thelight input surface 521. - Referring to FIG. 5, a
backlight module 6 according to a fourth embodiment of the present invention comprises a reflectingplate 65, a diffusingplate 66 and abrightness enhancing film 67, in addition to alight guide plate 62 and alight source group 61. The reflectingplate 65 is disposed adjacent abottom surface 623 of thelight guide plate 62, which is opposite to a toplight output surface 622 of thelight guide plate 62. The diffusingplate 66 is disposed between thebrightness enhancing film 67 and thelight guide plate 62. Thelight source group 61 comprises three point light sources such as LEDs (not labeled). - As described above, each
backlight module light input surface light source group light source group light input surface light guide plate - In the
backlight modules brightness enhancing film - According the requirements of particular applications, the backlight module of the present invention may take forms other than the embodiments described above. For example, a linear light source may be used instead of a light source group comprising point light sources. In such case, the light input surface may be configured accordingly. In particular, instead of being spherically concave, the light input surface may be cylindrically concave. That is, a top elevation of the light guide plate shows the light input surface having a linear profile, and a side elevation of the light guide plate shows the light input surface having an arcuate profile. Still other types of light input surfaces may be configured according to need. Further, two or several light input surfaces may be employed instead of only one light input surface. Yet, another alternation may include to keep the light input surface straight while arranging the group of light sub-sources to disperse in a concave manner.
- It is also to be generally understood that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (16)
1. A backlight module, comprising:
a light source; and
a light guide plate having a light input surface for receiving light and a light output surface for emitting light;
wherein the light source faces the light input surface; and
the light input surface is concave, and has a curvature matching a distribution of light of the light source group.
2. The backlight module as claimed in claim 1 , wherein the light guide plate is generally parallelepiped-shaped.
3. The backlight module as claimed in claim 1 , wherein the light guide plate is generally wedge-shaped.
4. The backlight module as claimed in claim 1 , wherein the light source is a group of point light sources.
5. The backlight module as claimed in claim 1 , wherein the light source is a linear light source.
6. The backlight module as claimed in claim 1 , wherein the light input surface is spherically concave.
7. The backlight module as claimed in claim 1 , wherein the light input surface is a cylindrically concave.
8. The backlight module as claimed in claim 1 , wherein the light input surface is disposed opposite the light output surface.
9. The backlight module as claimed in claim 8 , further comprising a diffusing plate and a brightness enhancing film, the diffusing plate being disposed on the light guide plate, and the brightness enhancing film being disposed on the diffusing plate.
10. The backlight module as claimed in claim 9 , wherein the brightness enhancing film is substituted by a prism plate.
11. The backlight module as claimed in claim 1 , wherein the light input surface adjoins the light output surface.
12. The backlight module as claimed in claim 11 , further comprising a diffusing plate and a brightness enhancing film, the diffusing plate being disposed on the light guide plate, and the brightness enhancing film being disposed on the diffusing plate.
13. The backlight module as claimed in claim 12 , further comprising a reflecting plate disposed under the light guide plate.
14. The backlight module as claimed in claim 13 , wherein the brightness enhancing film is substituted by a prism plate.
15. A light module comprising:
a light guide plate defining a light input surface for receiving light, said light input surface essentially extending in a direction longitudinally; and
a light source including a plurality of spaced light sub-sources generally arranged along said direction; wherein
at least one of said light input surface and a dispersion manner of said plurality of spaced light sub-sources is configured to be in a form of concave to conform with the other so as to form no dark zones in the light guide plate.
16. The light module as claimed in claim 15 , wherein said light input surface is configured to be in a form of concave.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/286,121 US7195391B2 (en) | 2002-12-06 | 2005-11-22 | Backlight module with light guide plate having concave light input surface |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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TW91219755 | 2002-12-06 | ||
TW091219755U TW558015U (en) | 2002-12-06 | 2002-12-06 | Backlight module |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/286,121 Continuation US7195391B2 (en) | 2002-12-06 | 2005-11-22 | Backlight module with light guide plate having concave light input surface |
Publications (1)
Publication Number | Publication Date |
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US20040114348A1 true US20040114348A1 (en) | 2004-06-17 |
Family
ID=32295281
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10/731,043 Abandoned US20040114348A1 (en) | 2002-12-06 | 2003-12-08 | Backlight module with light guide plate having concave light input surface |
US11/286,121 Expired - Fee Related US7195391B2 (en) | 2002-12-06 | 2005-11-22 | Backlight module with light guide plate having concave light input surface |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US11/286,121 Expired - Fee Related US7195391B2 (en) | 2002-12-06 | 2005-11-22 | Backlight module with light guide plate having concave light input surface |
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US (2) | US20040114348A1 (en) |
TW (1) | TW558015U (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050213344A1 (en) * | 2004-03-29 | 2005-09-29 | Fujinon Corporation | Light source device for illumination |
US20100214509A1 (en) * | 2008-02-07 | 2010-08-26 | Sony Corporation | Light guide plate, surface-emitting apparatus, liquid crystal display apparatus, and method of producing a light guide plate |
US20140169035A1 (en) * | 2012-12-13 | 2014-06-19 | Hon Hai Precision Industry Co., Ltd. | Light guide plate and backlight module incorporating the same |
US20140204563A1 (en) * | 2013-01-21 | 2014-07-24 | Shenzhen Coocaa Network Technology Co., Ltd | Lens, led backlight module and display device |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWM296387U (en) * | 2005-12-23 | 2006-08-21 | Coretronic Corp | Backlight module |
JP4774035B2 (en) * | 2007-12-28 | 2011-09-14 | シャープ株式会社 | Surface light source and display device |
TWI380096B (en) | 2009-05-08 | 2012-12-21 | Au Optronics Corp | Backlight unit |
CN105579768B (en) * | 2013-09-25 | 2017-10-24 | 堺显示器制品株式会社 | Lighting device and display device |
Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2646637A (en) * | 1950-01-26 | 1953-07-28 | Richard N Nierenberg | Device for trans-illuminating transparencies |
US3740540A (en) * | 1969-02-19 | 1973-06-19 | Matsushita Electric Ind Co Ltd | Dial illuminating device |
US6065845A (en) * | 1997-03-18 | 2000-05-23 | Seiko Epson Corporation | Lighting device, liquid crystal display device and electronic equipment |
US6139163A (en) * | 1998-06-05 | 2000-10-31 | Citizen Electronics Co., Ltd. | Planar light source unit |
US6191833B1 (en) * | 1998-12-24 | 2001-02-20 | Hitachi, Ltd. | Liquid crystal display device having reflection film between prism sheet and liquid crystal panel |
US6250767B1 (en) * | 1998-06-22 | 2001-06-26 | Sanyo Electric Co. Ltd. | Light guide plate, surface light source and display using the same |
US6283602B1 (en) * | 1997-03-18 | 2001-09-04 | Seiko Epson Corporation | Lighting device, liquid crystal display unit, and electronic equipment |
US20020181222A1 (en) * | 2001-04-06 | 2002-12-05 | Boyd Gary T. | Linear illumination source |
US6561660B2 (en) * | 2001-06-26 | 2003-05-13 | Wintek Corporation | Light guiding device of a liquid crystal display |
US6601962B1 (en) * | 1999-05-11 | 2003-08-05 | Nichia Corporation | Surface light emitting device |
US6669350B2 (en) * | 2000-12-14 | 2003-12-30 | Mitsubish Rayon Co., Ltd. | Planar light source system and light deflecting device therefor |
US6808279B2 (en) * | 2001-01-20 | 2004-10-26 | Koninklijke Philips Electronics N.V. | Lighting device with linear light sources |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002133932A (en) * | 2000-10-20 | 2002-05-10 | Casio Comput Co Ltd | Light source element |
-
2002
- 2002-12-06 TW TW091219755U patent/TW558015U/en not_active IP Right Cessation
-
2003
- 2003-12-08 US US10/731,043 patent/US20040114348A1/en not_active Abandoned
-
2005
- 2005-11-22 US US11/286,121 patent/US7195391B2/en not_active Expired - Fee Related
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2646637A (en) * | 1950-01-26 | 1953-07-28 | Richard N Nierenberg | Device for trans-illuminating transparencies |
US3740540A (en) * | 1969-02-19 | 1973-06-19 | Matsushita Electric Ind Co Ltd | Dial illuminating device |
US6065845A (en) * | 1997-03-18 | 2000-05-23 | Seiko Epson Corporation | Lighting device, liquid crystal display device and electronic equipment |
US6283602B1 (en) * | 1997-03-18 | 2001-09-04 | Seiko Epson Corporation | Lighting device, liquid crystal display unit, and electronic equipment |
US6139163A (en) * | 1998-06-05 | 2000-10-31 | Citizen Electronics Co., Ltd. | Planar light source unit |
US6250767B1 (en) * | 1998-06-22 | 2001-06-26 | Sanyo Electric Co. Ltd. | Light guide plate, surface light source and display using the same |
US6191833B1 (en) * | 1998-12-24 | 2001-02-20 | Hitachi, Ltd. | Liquid crystal display device having reflection film between prism sheet and liquid crystal panel |
US6601962B1 (en) * | 1999-05-11 | 2003-08-05 | Nichia Corporation | Surface light emitting device |
US6669350B2 (en) * | 2000-12-14 | 2003-12-30 | Mitsubish Rayon Co., Ltd. | Planar light source system and light deflecting device therefor |
US6808279B2 (en) * | 2001-01-20 | 2004-10-26 | Koninklijke Philips Electronics N.V. | Lighting device with linear light sources |
US20020181222A1 (en) * | 2001-04-06 | 2002-12-05 | Boyd Gary T. | Linear illumination source |
US6561660B2 (en) * | 2001-06-26 | 2003-05-13 | Wintek Corporation | Light guiding device of a liquid crystal display |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050213344A1 (en) * | 2004-03-29 | 2005-09-29 | Fujinon Corporation | Light source device for illumination |
US20100214509A1 (en) * | 2008-02-07 | 2010-08-26 | Sony Corporation | Light guide plate, surface-emitting apparatus, liquid crystal display apparatus, and method of producing a light guide plate |
US8749729B2 (en) * | 2008-02-07 | 2014-06-10 | Sony Corporation | Light guide plate, surface-emitting apparatus, liquid crystal display apparatus, and method of producing a light guide plate |
US20140169035A1 (en) * | 2012-12-13 | 2014-06-19 | Hon Hai Precision Industry Co., Ltd. | Light guide plate and backlight module incorporating the same |
US20140204563A1 (en) * | 2013-01-21 | 2014-07-24 | Shenzhen Coocaa Network Technology Co., Ltd | Lens, led backlight module and display device |
US9080743B2 (en) * | 2013-01-21 | 2015-07-14 | Shenzhen Coocaa Network Technology Co., Ltd | Lens, LED backlight module and display device |
Also Published As
Publication number | Publication date |
---|---|
US20060077689A1 (en) | 2006-04-13 |
US7195391B2 (en) | 2007-03-27 |
TW558015U (en) | 2003-10-11 |
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Owner name: HON HAI PRECISION IND. CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LIN, JYH CHAIN;REEL/FRAME:014792/0293 Effective date: 20031122 |
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