CN1227561C - Plane light source device and liquid crystal display - Google Patents

Plane light source device and liquid crystal display Download PDF

Info

Publication number
CN1227561C
CN1227561C CN 02131652 CN02131652A CN1227561C CN 1227561 C CN1227561 C CN 1227561C CN 02131652 CN02131652 CN 02131652 CN 02131652 A CN02131652 A CN 02131652A CN 1227561 C CN1227561 C CN 1227561C
Authority
CN
China
Prior art keywords
light source
guide plate
light guide
characterized
surface
Prior art date
Application number
CN 02131652
Other languages
Chinese (zh)
Other versions
CN1482497A (en
Inventor
谢志杰
Original Assignee
瀚宇彩晶股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 瀚宇彩晶股份有限公司 filed Critical 瀚宇彩晶股份有限公司
Priority to CN 02131652 priority Critical patent/CN1227561C/en
Publication of CN1482497A publication Critical patent/CN1482497A/en
Application granted granted Critical
Publication of CN1227561C publication Critical patent/CN1227561C/en

Links

Abstract

The present invention relates to a flat light source device and a liquid crystal display. The flat light source device comprises at least one linear light source or point light source, a light guide plate and a reflector, wherein the light guide plate is provided with a low and an upper surfaces, at least one groove is arranged in the lower surface to contain the light source, at least a pair of first inclined surfaces are arranged on the upper surface corresponding to the groove, and the first inclined surfaces are matched with the groove to guide the light of the light source into the light guide plate; the reflector is arranged on the lower surface of the light guide plate and covers the light source. The liquid crystal display of the present invention comprises a liquid crystal display panel and the flat light source device. The flat light source device of the present invention can avoid optical energy loss caused by mutual irradiation of lamp tubes, the brightness is increased, and the thickness of the flat light source device is reduced; because the brightness of the back light module is increased, the prismatic lenses can be reduced, the cost is lowered, and the viewing angle of the back light module is not reduced; in addition, the light source of the flat light source device is embedded in the light guide plate, and thereby, the size of the back light module is reduced.

Description

Planar light source device and LCD

Technical field

The present invention relates to technical field of liquid crystal display, especially a kind of planar light source device and LCD.

Background technology

As shown in Figure 1, the structure of LCD (LCD) device is commonly used in its demonstration.Generally speaking, this LCD device comprises a panel of LCD 10, and it comprises and is provided with below and shell 11 and 12 that liquid crystal material, a module 20 backlight are disposed at this panel of LCD 10 in the middle of the two substrates.

The light that this module 20 backlight is sent a light source is dispensed on the surface of this liquid crystal panel 10 uniformly.Being used for backlight liquid crystal display module 20 generally can be divided into: directly descend light source pattern and edge light pattern.

Please refer to Fig. 2, it shows a kind of down straight aphototropism mode set 21, along the cross section view of Fig. 1 section line 2-2.This down straight aphototropism mode set 21 comprises a shell 70, it has a reflector plate 60 and is disposed at its lower surface, and the fluorescent tube such as cold-cathode tube 50, be positioned at its bottom, a diffusion sheet 40 is positioned on this shell 70 and prismatic lens 30,35 is disposed on this diffusion sheet 40.Because these fluorescent tube 50 compartment of terrains are disposed in the viewing area of this panel of LCD 10, so the skewness of the illumination of this panel of LCD.Again, the on-off element of this liquid crystal panel 10 (switching element) also might damage because of the heat energy of this backlight.

Therefore, just need to exist a certain distance or interval in this fluorescent tube 50 and 40 of this diffusion sheets.This distance or interval generally provide by the support column 55 in this shell 20.Typically, the center of this fluorescent tube 50 to the distance of its shadow surface need be greater than half of this fluorescent tube spacing.Because these structural demands, just ten minutes is difficult to reduce the thickness of down straight aphototropism mode set 21.Moreover fluorescent tube 50 itself also can absorb the light that other fluorescent tubes radiate, and reduces the usefulness of optics.

Please refer to Fig. 3, it shows a kind of side type module 22 backlight, along the cross section view of Fig. 1 section line 2-2.This side type module 22 backlight comprises that a light guide plate 80, a fluorescent tube 50 are installed at least one side of this light guide plate 80 and a U-shaped reverberator 61 around this fluorescent tube 50.One opening portion of this reverberator 61 is fixed in the side of this light guide plate 80, and a reflector plate 60 is fixed in the bottom of this light guide plate 80, and a diffusion sheet 40 is fixed on this light guide plate 80, and prismatic lens 30 is fixed on this diffusion sheet 40.Because this fluorescent tube 50 is disposed at the edge of this light guide plate 80, so the thickness of this LCD just is minimized.

This light guide plate 80 has the point-like of a printing or the pattern 82 of v-depression, is positioned on its at least one surface, and generally with the PMMA mold forming.This diffusion sheet 40 is disposed on this light guide plate 80, usually with translucent PET or polycarbonate (polycarbonate; PC), poly terephthalic acid diethylester plastic cement (PET) manufacturing, with so that the light that penetrates by this light guide plate homogenising more.This prismatic lens 30 is disposed on this diffusion sheet 40, and the light in order to this diffusion sheet 40 is emitted accumulates in heavy straight on the direction of this prismatic lens 30.

Because the illumination of this panel of LCD 10 provides by these light guide plate 80 emitted light, so this light guide plate 80 must illuminate this panel of LCD 10 uniformly.Yet especially under the situation of large-sized monitor, light guide plate often can not provide good homogeneous illumination.Moreover, light guide plate 80 and on the manufacturing cost of pattern very expensive.

For prior art backlight liquid crystal display module, have many effort and attempt to improve the brightness of LCD, uniform illumination is provided, reduces power consumption, reduces manufacturing cost, also reduces volume simultaneously.For example, such as 12 United States Patent (USP)s the 6th, 164 of giving Lee on the 26th in 2000, No. 790, nineteen ninety-five 12 No. the 5th, 477,422, United States Patent (USP) and 1 United States Patent (USP)s the 5th of giving people such as Ciupke on the 16th in 1996 of giving people such as Hooker on the 19th, 485, No. 354.Yet aforementioned patent and the module backlight that prior art provided still can't satisfy above-mentioned requirement for module backlight.

Now again with reference to 4a and 4b figure, it discloses the module backlight 23 of a kind of light emitting diode (LED) light source of prior art, along the cross section view of Fig. 1 section line 2-2.The module backlight 23 of this light emitting diode comprises that a light guide plate 80, a plurality of light emitting diode 51 are positioned at the dual-side of this light guide plate 80, reach bottom and side that reflector plate 60,62 is disposed at this module 23 backlight respectively.This LED backlight module 23 also can't satisfy the demand, particularly for large-sized LCD, can't provide uniform light more,, and only be positioned at the side of this module 23 backlight because this light emitting diode is for being substantially a pointolite but not line source.

In view of this, just having to provide a kind of module backlight, is used for LCD, can overcome aforesaid shortcoming.

Summary of the invention

The purpose of this invention is to provide a kind of planar light source device, it has uniform illumination, exquisite more and lower manufacturing cost.

Another object of the present invention provides a kind of backlight liquid crystal display module, and it has uniform illumination, exquisite more and lower manufacturing cost.

For reaching above-mentioned purpose, the invention provides a kind of planar light source device, comprising: a light source; One light guide plate, define an a lower surface and a upper surface, and have a groove and be positioned at this lower surface, to be positioned at this upper surface corresponding with this groove in order to hold this light source and a kerf, in order to this groove acting in conjunction, the light of the light source of at least one imports in this light guide plate with this, and wherein this otch has one first inclined surface; And a reverberator, be positioned at the lower surface of this light guide plate, and cover this light source.

The present invention also proposes a kind of LCD, comprises a panel of LCD, and an above-mentioned planar light source device.

Described before combining, this planar light source device can avoid fluorescent tube to shine the optical energy of being lost mutually, and increases brightness, and reduces the thickness of this planar light source device.Because the increase of this module brightness backlight,, not only reduce cost and make unlikely the dwindling in visual angle of this module backlight so can reduce the use of prismatic lens.Moreover according to planar light source device of the present invention, light source is embedded in this light guide plate, so can will hang down the size of module backlight.

Description of drawings

In order to allow above-mentioned and other purposes of the present invention, feature and the advantage can be more obvious, preferred embodiment of the present invention cited below particularly, and cooperate appended diagram, be described in detail below.

Fig. 1 is the volume rendering expansion synoptic diagram according to the LCD of prior art;

Fig. 2 is the diagrammatic cross-section according to the down straight aphototropism mode set of prior art;

Fig. 3 is the diagrammatic cross-section according to the side type module backlight of prior art;

Fig. 4 a is the last floor map according to the LED backlight module of prior art;

Fig. 4 b is the diagrammatic cross-section of this LED backlight module among Fig. 4 a;

Fig. 5 is the diagrammatic cross-section of LCD according to an embodiment of the invention;

The local amplification profile synoptic diagram of Fig. 6 module light guide plate backlight according to another embodiment of the present invention;

Fig. 7 is the size synoptic diagram of module light guide plate backlight according to an embodiment of the invention;

Fig. 8 a is the last floor map of LED backlight module according to still another embodiment of the invention;

Fig. 8 b is the diagrammatic cross-section of this LED backlight module among Fig. 8 a.

Embodiment

Please refer to Fig. 5, it shows according to LCD 100 of the present invention.This LCD 100 comprises a panel of LCD 110 and a module 120 backlight.This panel of LCD 110 has two transparency carriers 112,114, and liquid crystal material 116 is disposed at wherein.Have on-off element (switching element) on the transparency carrier 112,114 of this panel of LCD 110, produce image in order to the arrangement that changes liquid crystal molecule.

This module 120 backlight act as a planar light source device, is used in the whole viewing area, launches light uniformly and illuminates this panel of LCD 110.This module backlight comprises a plurality of linear light sources, such as the blooming of fluorescent tube 150, a light guide plate 180 and multilayer, such as diffusion sheet 140 and prismatic lens 130.This fluorescent tube 150 can be cold cathode ray tube (cold cathode fluorescentlamp; CCFL).

This light guide plate 180 has a plurality of grooves 210 and is positioned at its bottom, and in order to holding this fluorescent tube 150, and a plurality of otch 220 is positioned at its top.The position of this otch 220 is corresponding with the position of this groove 210, and the profile of this otch 220 and 210 actings in conjunction of this groove, so make to enter the light that this fluorescent tube 150 is launched in this light guide plate 180, and by total reflection (total internalreflection) in wherein the diffusion.So, can be by the light that this fluorescent tube 150 is launched via this light guide plate 180, the upper surface (exit facet) 226 by this light guide plate 180 penetrates uniformly, and illuminates this panel of LCD 110 uniformly.This module 120 backlight comprises four offside reflection plates 182 and a bottom reflecting plate 184 in addition.This offside reflection plate 182 be disposed at this light guide plate 180 around, reflect back in this light guide plate 180 in order to the light of the sidewall that will be incident upon this light guide plate 180.This bottom reflecting plate 184 is disposed at the lower surface of this light guide plate 180, in order to this light guide plate of light reflected back of the lower surface that will be incident upon this light guide plate 180.Again, this bottom reflecting plate 184 has a plurality of convex ridges 186 in addition, and configuration corresponds to this fluorescent tube 150 belows, and the light in order to further this fluorescent tube 150 is penetrated imports in this light guide plate 180.

This light guide plate 180 is generally with material transparent, such as acryl resin (Acrylic Resin; PMMA) manufacturing.This light guide plate 180 can be integrally formed, as shown in Figure 5.Yet according to another embodiment of the present invention, as shown in Figure 6, this light guide plate 180 also can be made up by a succession of modular intermeshing light guide 180 '.This light guide 180 ' has snap openings 192, and fastening bolt 190 is in order to meshing this snap openings 192, and forms this whole light guide plate 180.

Now please refer to Fig. 7, it shows the size according to this light guide plate 180 of the first embodiment of the present invention.With reference to figure 7, under critical conditions, the light of this fluorescent tube 150 (as shown in phantom in FIG.) the vertically surface level 212 of this groove 210 goes into to inject this light guide plate 180, when shining a pair of first inclined surface 222 of this otch 220, total reflection can take place, so this angle θ 1Should be less than 2* (90-θ c), θ c is the critical angle of village's material of light guide plate, that is for acryl resin (Acrylic Resin; Refractive index (index of refraction)=1.49), critical angle θ c=42.2 degree, θ 1Should be less than 95.6 degree.The width W of the surface level 212 of this groove 210 1Should equal the width W of these two first inclined surfaces 222 of this otch 220 substantially 2

According to preferred embodiment of the present invention, this groove 210 has a pair of inclined-plane 214 in addition, and this otch 220 has a pair of second inclined surface 224 in addition.The angle theta that the inclined-plane 214 of this groove 210 and surface level are 212 3And the angle theta that this second inclined surface 224 of this otch 220 and this upper surface of this light guide plate 180 are 226 2And, less than about 90 the degree.The width W of this second inclined surface 224 of this otch 220 3, greater than the height H of 226 of the upper surfaces of this fluorescent tube 150 and this light guide plate 180 1, and preferable greater than this height H 1Twice.

The width of this groove 210 (distances that this two vertical wall is 216) W 4Be slightly larger than this fluorescent tube 150 diameters, so that provide this fluorescent tube 150 enough heat-dissipating spaces, to reduce the possibility that the direct contact heat conduction reduces the blooming piece thermal deformation, on this gap typical case is 0.5mm.So this width W 4Add 1.0mm greater than fluorescent tube 150 diameters.The angle θ of this convex ridge 186 4Less than 180 degree.Height H between the lower surface of this fluorescent tube 150 and this light guide plate 180 2Height greater than this convex ridge 186.According to geometry design of the present invention, this groove 210 can satisfy the requirement of total reflection (total internal reflection), and divergent light source, and avoids the generation of the bright band above the fluorescent tube.

Wherein, 224 of the upper surface 226 of this light guide plate 180 and this second inclined surfaces, and the joint of 222 of this second inclined surface 224 and this first inclined surfaces have fillet, form uneven illumination to avoid light in this joint.Yet 222 of this two first dip plane are sharp keen combination (not having chamfering or fillet), and the joint of 216 on the inclined-plane 214 of this groove 210 and this surface level 212 and this heavy straight wall also is sharp keen combining.

Now please refer to Fig. 8 a and 8b, it shows the module backlight 520 of a third embodiment in accordance with the invention.This module 520 backlight is similar to this module 120 backlight substantially.This module 520 backlight has a light guide plate 580 and a plurality of point source of light, such as light emitting diode (LED) light source 550, and the blooming of multilayer, such as diffusion sheet 540 and prismatic lens 530.This light guide plate 580 has a plurality of recesses 610 in order to holding this light source 550, and a plurality of recess 620 is corresponding with this recess 610.Being skillful in this skill person can understand, the profile of the section of this recess 510 and this recess 620, consistent with the profile of this groove 210 of this first embodiment and this otch 220, therefore as previously mentioned, the light that this light guide plate 580 can be launched this light source 550 imports in this light guide plate 580.Clearer and more definite, this recess 610 has the profile of truncated cone substantially, define a surface level 612, a truncated cone face 614 and a vertical wall 616, and this recess 620 defines one first circular conical surface 622 and one first circular conical surface 624, the upper surface 626 of light guide plate 580.

For this led light source 550, this light source 550 is embedded in the recess 610 of this light guide plate 580, and scatters the emitted light of this light source 550 uniformly by this light guide plate 580.Therefore, module 520 backlight according to the present invention only need increase the quantity of this led light source 550, just can provide large-area planar light source, and be applicable to large-sized purposes.

Described before combining, according to module backlight of the present invention or planar light source, has a light guide plate, its part with depression is in order to hold linear light source (fluorescent tube) or point source of light (led light source), and otch can with this sunk part acting in conjunction, and the light that this light source is launched is imported in this light guide plate.

Because this light guide plate, this module backlight or planar light source can avoid fluorescent tube to shine the optical energy of being lost mutually, and increase brightness, and reduce the thickness of this module backlight.Because the increase of this module brightness backlight,, not only reduce cost and make unlikely the dwindling in visual angle of this module backlight so can reduce the use of prismatic lens.Moreover according to module backlight of the present invention, light source is embedded in this light guide plate, so can reduce the size of module backlight.

Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those who are familiar with this art, without departing from the spirit and scope of the invention; when can doing a little change and retouching, so the present invention's protection domain is as the criterion when looking claims scope person of defining.

Claims (27)

1. a planar light source device is characterized in that, comprising:
One light source;
One light guide plate, define an a lower surface and a upper surface, and have a recess and be positioned at this lower surface, to be positioned at this upper surface corresponding with this recess in order to hold this light source and a kerf, in order to this recess acting in conjunction, the light of this light source is imported in this light guide plate, and wherein this otch has one first inclined surface; And
One reverberator is positioned at the lower surface of this light guide plate, and covers this light source.
2. planar light source device as claimed in claim 1 is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface.
3. planar light source device as claimed in claim 2 is characterized in that: this first inclined surface is being parallel to the width that width on the direction of this upper surface should equal this surface level.
4. planar light source device as claimed in claim 2 is characterized in that: this recess of this light guide plate has an inclined-plane in addition, is connected in this surface level, and the light of using further this light source imports in this light guide plate.
5. planar light source device as claimed in claim 2 is characterized in that: this light guide plate has one second inclined surface in addition, connects upper surface and this first inclined surface of this light guide plate.
6. planar light source device as claimed in claim 5 is characterized in that: the angle between the upper surface of this of this light guide plate second inclined surface and this light guide plate, and the summation of this inclined-plane of this recess and the angle between this surface level, and less than 90 degree.
7. planar light source device as claimed in claim 6 is characterized in that: this second inclined surface is being parallel to width on the direction of this upper surface greater than the distance of this light source center to the upper surface of this light guide plate.
8. planar light source device as claimed in claim 1 is characterized in that: this reverberator has a convex ridge in addition, is positioned at the below of this recess of this light guide plate, with respect to this light source, and stretches in this recess of this light guide plate.
9. planar light source device as claimed in claim 1 is characterized in that: this light source is a linear light source.
10. planar light source device as claimed in claim 1 is characterized in that: this light source is a point-like light source.
11. planar light source device as claimed in claim 1 is characterized in that: this first inclined surface is a circular conical surface.
12. planar light source device as claimed in claim 5 is characterized in that: this second inclined surface is a circular conical surface.
13. a LCD is characterized in that, comprising:
One panel of LCD; And
One module backlight in order to illuminate this panel of LCD, comprising:
A light source;
One light guide plate, define an a lower surface and a upper surface, and have a recess and be positioned at this lower surface, to be positioned at this upper surface corresponding with this recess in order to hold this light source and a kerf, in order to this recess acting in conjunction, the light of this light source is imported in this light guide plate, and wherein this otch has one first inclined surface; And
One reverberator is positioned at the lower surface of this light guide plate, and covers this fluorescent tube.
14. LCD as claimed in claim 13 is characterized in that: this light source of this module backlight is a linear light source.
15. LCD as claimed in claim 13 is characterized in that: this light source of this module backlight is a point-like light source.
16. LCD as claimed in claim 13 is characterized in that: this recess of this light guide plate defines a surface level and is parallel to this lower surface.
17. LCD as claimed in claim 16 is characterized in that: this first inclined surface is being parallel to the width that width on the direction of this upper surface should equal this surface level.
18. LCD as claimed in claim 16 is characterized in that: this recess of this light guide plate has an inclined-plane in addition, is connected in this surface level, and the light of using further this light source imports in this light guide plate.
19. LCD as claimed in claim 16 is characterized in that: this light guide plate has one second inclined surface in addition, connects upper surface and this first inclined surface of this light guide plate.
20. LCD as claimed in claim 19 is characterized in that: the angle between the upper surface of this of this light guide plate second inclined surface and this light guide plate, and the summation of this inclined-plane of this recess and the angle between this surface level, less than 90 degree.
21. LCD as claimed in claim 20 is characterized in that: this second inclined surface is being parallel to width on the direction of this upper surface greater than the distance of this light source center to the upper surface of this light guide plate.
22. LCD as claimed in claim 13 is characterized in that: this reverberator has a convex ridge in addition, is positioned at the below of this groove of this light guide plate, with respect to this light source, and stretches in this recess of this light guide plate.
23. LCD as claimed in claim 13 is characterized in that: this first inclined surface is a circular conical surface.
24. LCD as claimed in claim 19 is characterized in that: this second inclined surface is a circular conical surface.
25. LCD as claimed in claim 13 is characterized in that: the critical angle of village's material of this light guide plate is θ c, and the angle between this first inclined surface is less than 2* (90-θ c).
26. LCD as claimed in claim 13 is characterized in that: this recess of this light guide plate defines a pair of vertical wall perpendicular to this lower surface.
27. LCD as claimed in claim 26 is characterized in that: this recess of this light guide plate has a pair of inclined-plane in addition, connects this vertical wall and this surface level, and the light of using further this light source imports in this light guide plate.
CN 02131652 2002-09-12 2002-09-12 Plane light source device and liquid crystal display CN1227561C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02131652 CN1227561C (en) 2002-09-12 2002-09-12 Plane light source device and liquid crystal display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 02131652 CN1227561C (en) 2002-09-12 2002-09-12 Plane light source device and liquid crystal display

Publications (2)

Publication Number Publication Date
CN1482497A CN1482497A (en) 2004-03-17
CN1227561C true CN1227561C (en) 2005-11-16

Family

ID=34144989

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 02131652 CN1227561C (en) 2002-09-12 2002-09-12 Plane light source device and liquid crystal display

Country Status (1)

Country Link
CN (1) CN1227561C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009100610A1 (en) * 2008-01-30 2009-08-20 Dongguan Memtech Electronic Products Co., Ltd Light guiding plate for uniformly emitting light
WO2009135337A1 (en) * 2008-05-09 2009-11-12 Industrial Technology Research Institute Backlight module

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100346372C (en) * 2004-03-23 2007-10-31 北京高科能光电技术有限公司 Low-consumption luminous display plate and producing method thereof
JP4435625B2 (en) * 2004-06-07 2010-03-24 株式会社 日立ディスプレイズ Liquid crystal display
KR20060012959A (en) 2004-08-05 2006-02-09 삼성전자주식회사 Back light for display device
CN100388080C (en) * 2004-09-30 2008-05-14 晶元光电股份有限公司 Light emitting device
CN100375133C (en) * 2004-12-27 2008-03-12 北京高科能光电技术有限公司 Light emitting screen of side light source supplied by AC / DC electricity
CN100437276C (en) * 2005-08-05 2008-11-26 鸿富锦精密工业(深圳)有限公司 Straight down type back light component and liquid crystal display device
CN100422817C (en) * 2005-08-19 2008-10-01 深圳帝光电子有限公司 Full run-down type back light source
US8251562B2 (en) 2006-07-21 2012-08-28 Fujifilm Corporation Unitary light guide plate, light guide plate unit, planar lighting device and liquid crystal display device
CN101126866B (en) * 2006-08-17 2010-12-29 奇美电子股份有限公司 Direct type backlight module and liquid crystal display comprising the backlight module
KR101830718B1 (en) * 2011-07-15 2018-02-22 엘지이노텍 주식회사 display apparatus
CN102279436B (en) * 2011-09-06 2014-11-19 青岛海信电器股份有限公司 Backlight module and display device
CN102829392A (en) * 2012-07-26 2012-12-19 深圳市华星光电技术有限公司 Backlight module and display device
TW201426036A (en) * 2012-12-24 2014-07-01 Radiant Opto Electronics Corp Light guide element and light source using the same
US9575237B2 (en) 2012-12-24 2017-02-21 Radiant Opto-Electronics Corporation Light guide element and light source device using the light guide element
CN103499068B (en) * 2013-09-30 2016-03-09 京东方科技集团股份有限公司 A kind of backlight, spliced backlight and display unit
CN107065061B (en) * 2017-04-27 2020-02-14 武汉华星光电技术有限公司 Light guide plate and direct type backlight assembly
CN107315277A (en) * 2017-07-03 2017-11-03 京东方科技集团股份有限公司 Backlight module, display device
TWI662229B (en) * 2018-12-24 2019-06-11 光寶電子(廣州)有限公司 Light source module

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009100610A1 (en) * 2008-01-30 2009-08-20 Dongguan Memtech Electronic Products Co., Ltd Light guiding plate for uniformly emitting light
WO2009135337A1 (en) * 2008-05-09 2009-11-12 Industrial Technology Research Institute Backlight module

Also Published As

Publication number Publication date
CN1482497A (en) 2004-03-17

Similar Documents

Publication Publication Date Title
JP3778186B2 (en) Light guide plate
EP2397878B1 (en) The backlight unit and the display device having the same
KR100774224B1 (en) Backlight unit and liquid crystal display device using the same
CN100434988C (en) Light guide plate
KR100714209B1 (en) Surface light source device and liquid crystal display device using it
US7837360B2 (en) Optical module
JP3297846B2 (en) Transmission type surface illumination device
US7309149B2 (en) Prism sheet, backlight assembly and liquid crystal display device having the same
US7018088B2 (en) Light guide plate for liquid crystal display
JP4477600B2 (en) Backlight module
KR100883098B1 (en) Back light assembly and liquid crystal display device using the same
KR100810806B1 (en) Illumination system, light mixing chamber and display device
US7273311B2 (en) Light guide plate and backlight module using the same
US7431491B2 (en) Light guide plate and backlight module using the same
US7325958B2 (en) Light guiding plate and backlight module employing the same
KR100864321B1 (en) Diffuser prism sheet comprising amorphous light diffuser on the valley of prism and lcd back light unit thereby
US6802619B2 (en) Surface-emitting device and liquid crystal display device with enhanced utilization efficiency of light from light source
JP3012462B2 (en) Light guide plate, surface light source and non-light emitting display device using the same
US7334934B2 (en) Light guide device and a backlight module using the same
US7530725B2 (en) Light guide plate with reflective/refractive depressions, and backlight module using the same
US7470046B2 (en) Backlight module and illumination device thereof
JP4750831B2 (en) Light guide plate and backlight module
US6971782B2 (en) Illumination device and liquid crystal display device
US8300175B2 (en) Lighting device having reflecting parts and liquid crystal display device using the same
JP4992721B2 (en) Surface light emitting device and liquid crystal display device

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant