CN100363810C - Backlight module - Google Patents
Backlight module Download PDFInfo
- Publication number
- CN100363810C CN100363810C CNB031137938A CN03113793A CN100363810C CN 100363810 C CN100363810 C CN 100363810C CN B031137938 A CNB031137938 A CN B031137938A CN 03113793 A CN03113793 A CN 03113793A CN 100363810 C CN100363810 C CN 100363810C
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- Prior art keywords
- light
- guide plate
- light guide
- backlight module
- diffusion unit
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Abstract
The present invention relates to a back light module which comprises a plurality of point light sources and a light guide plate, wherein the light guide plate is provided with a first surface, a second surface which is opposite to the first surface, a plurality of side surfaces and a plurality of diffusing units, the second surface is a light emergent surface, the diffusing units are arranged on the first surface, at least one of the side surfaces is a light incident surface, and other side surfaces are light reflection side surfaces. The point light sources are arranged on a light incident surface of the light guide plate. A projected area of each diffusing unit on the first surface of the light guide plate is relative to the point light sources, projected areas of diffusing units which are adjacent to a region with poor incident light among point light sources are larger than those of diffusing units which are adjacent to a region with strong incident light near the point light sources, the nearer to the point light sources of the diffusing units in other regions are, the smaller of the projected areas are, and the nearer to the light reflection side surfaces and the farer from the light incident surface of the diffusing units are, the larger of the projected areas are. The diffusing units can enhance the uniformity of light exit of the back light module which adopts the point light sources.
Description
[technical field]
The present invention relates to a kind of backlight liquid crystal display module that is applied to.
[background technology]
Because the liquid crystal itself in the panel of LCD does not possess the characteristics of luminescence, so,, need to give the LCD panel that one planar light source device is provided for reaching display effect, as backlight module, its function is area source abundant to panel of LCD supply briliancy and that be evenly distributed.
The prior art backlight module mainly is made up of light source, light guide plate, reflecting plate, diffuser plate and prism plate.Wherein, this light source can be arranged at light guide plate one side or two opposite sides and with light emission to this light guide plate.The effect of this light guide plate is the transmission direction of direct light line, makes light by the even outgoing of the light-emitting face of light guide plate.Because the light that light source sends enters from the light guide plate side, so light guide plate is luminous brighter near the part of light source, and luminous darker away from the part of light source, therefore, for increasing the light extraction efficiency and the uniformity coefficient of light guide plate, the one side in light guide plate is provided with V-shaped groove or configuration light diffusion site usually.When light transmission during to V-shaped groove or light diffusion site, reflection and scattering will take place in light, and to each different directions transmission, finally by the light-emitting face ejaculation of light guide plate.Utilize various densitys, the V-shaped groove that varies in size or light diffusion site, can make light guide plate luminous evenly.
A kind of prior art backlight module as shown in Figure 1, it is exposed in No. the 01200808.7th, the Chinese patent of Dec 5 calendar year 2001 bulletin.This light guide plate 12 comprises two light mirrored sides 124, the bottom surface 122 that two light incident side faces 123 link to each other with light incident side face 123 and a plurality of on it of distributing are the site 16 that the ranks shape is arranged.This sidelight source 11 is arranged at light incident side face 123 central authorities.122 central authorities increase the projected area of this site 16 in this bottom surface 122 gradually to the bottom surface from light incident side face 123, the projected area maximum in 12 4 corners of light guide plate.
The disclosed technology of this patent can solve the luminous darker technical matters in light guide plate 12 opposite side corners substantially, also basic solution is luminous brighter near the part of light source 11, and away from the luminous darker technical matters of the part of light source 11, but prior art consideration pointolite quantity, distribution and its characteristics of luminescence are under-effected to the light guide plate outgoing light homogeneity.
Seeing also Fig. 2, is the light distribution synoptic diagram that adopts the prior art backlight module light-emitting face of a plurality of pointolites.When light guide plate 22 adopts a plurality of pointolites 21 (as light emitting diode), because pointolite 21 only is arranged at light incident side face 223, cause light guide plate 22 bigger near strong part (B district) luminosity of pointolite 21 place's incident lights, and it is relative less with each pointolite 21 part (C district) luminosity far away, and, pointolite 21 is if light emitting diode, then has a lighting angle because of it, its luminous light intensity is presenting the radioactivity shape with its contiguous light guide plate light-emitting face, cause between each light emitting diode, there is similar leg-of-mutton dark space (A district) in light guide plate light-emitting face incident light contiguous between light emitting diode and light guide plate flank side surface than weak part, therefore, aforesaid network point distribution is not suitable for the light guide plate of similar pointolites such as a plurality of light emitting diodes as light source.
[summary of the invention]
In order to overcome the not high defective of prior art backlight module outgoing light homogeneity, the invention provides a kind of backlight module with higher outgoing light homogeneity.
The technical scheme that technical solution problem of the present invention is adopted is: a backlight module is provided, it comprises a plurality of pointolites and a light guide plate, and this light guide plate comprises a first surface, one and this first surface opposing second surface, a plurality of flank side surface and many diffusion units.Wherein, this second surface is a light-emitting face, and this diffusion unit is arranged at this first surface, and at least one is light entrance face for these a plurality of flank side surface, and other flank side surface then is the light mirrored sides.Each diffusion unit is relevant with these a plurality of pointolites in the projected area of this light guide plate first surface, near the strong zone of the incident light of projected area ratio's pointolite of the diffusion unit in the more weak zone of incident light is big between contiguous each pointolite, the projected area of other regional diffusion unit of light guide plate is then more little the closer to pointolite, the closer to light mirrored sides and big more away from light entrance face more.
Compare with prior art, the present invention has the following advantages: because backlight module of the present invention makes full use of the bigger stronger know-why of light guide plate zone bright dipping ability of diffusion unit, cause the backlight module light guide plate light-emitting face that adopts a plurality of pointolites the technical matters of dark space to occur at the characteristics of luminescence owing to pointolite, and design the diffusion unit in the more weak zone of incident light between each pointolite of light guide plate in the backlight module bigger than near the strong zone of the incident light pointolite, in addition, the projected area of other regional diffusion unit of light guide plate is then more little the closer to pointolite, the closer to light mirrored sides and big more away from light entrance face more, thereby can improve the outgoing light homogeneity of the backlight module of pointolites such as adopting a plurality of light emitting diodes and this light guide plate.
[description of drawings]
Fig. 1 is the vertical view of prior art backlight module.
Fig. 2 is the light distribution synoptic diagram that prior art adopts the backlight module light-emitting face of a plurality of pointolites.
Fig. 3 is the bottom surface of light guide plate network point distribution synoptic diagram of first embodiment of the invention backlight module.
Fig. 4 is a light guide plate IV-IV direction view shown in Figure 3.
Fig. 5 is a light guide plate V-V direction view shown in Figure 3.
Fig. 6 is the bottom surface of light guide plate network point distribution synoptic diagram of second embodiment of the invention backlight module.
Fig. 7 is a light guide plate VII-VII direction view shown in Figure 6.
Fig. 8 is a light guide plate VIII-VIII direction view shown in Figure 6.
Fig. 9 is the side view of the light guide plate of third embodiment of the invention backlight module.
[embodiment]
Please consult Fig. 3, Fig. 4 and Fig. 5 together, wherein Fig. 3 omits processing to the bottom surface of light guide plate site.This backlight module 3 comprises a plurality of pointolites 31 and a light guide plate 32, and this light guide plate 32 comprises a light entrance face 323, a light-emitting face 321, a plurality of smooth mirrored sides 324, a bottom surface 322 and is distributed in the light diffusion site 36 of bottom surface 322.Wherein, these a plurality of pointolites 31 are arranged at the light entrance face 323 of this light guide plate 32, and this light guide plate 32 is rectangular flats, and this light-emitting face 321 and bottom surface 322 are oppositely arranged.
This light guide plate 32 is to make with transparent material such as acryl resin, polycarbonate, polyvinyl resin or glass etc.The light that this light entrance face 323 receives from pointolite 31, and it is imported in this light guide plate 32.This light-emitting face 321 is derived this light guide plate 32 with light.This light mirrored sides 324 is the light reflected back light guide plate 32 of incident on it, and via these light-emitting face 321 outgoing, causes damage from these light mirrored sides 324 outgoing to prevent light.Light mirrored sides 324 and bottom surface 322 can attach reflecting plate, also can adopt reflectance coating directly to plate thereon, so that the light of transmission fully reflects in light guide plate 32, finally through light-emitting face 321 outgoing.
This site 36 is in order to improve the outgoing light homogeneity of this light guide plate 32, and it also can be other light diffusion unit, as prism structure etc.This site 36 can be printed or the mode of ejection formation is made.This site 36 is circular for circle spherical surface body, its projection in light guide plate 32 bottom surfaces 322, and certainly, this site 36 also can be ellipsoid, polyhedron, cone or the most advanced and sophisticated taper platform etc. of pruning, and 322 projection also should be ellipse or polygon mutually in the bottom surface for it.This site 36 is a convex on this bottom surface 322.This site 36 is on the bottom surface 322 that alternating expression is distributed in this light guide plate 32, wherein, with proportional spacing multirow site 36 is set along light entrance face 323 vertical direction (being denoted as X among the figure), with proportional spacing multiple row site 36 is set along light entrance face 323 parallel directions (being denoted as Y among the figure), all the stagger row or column spacing of half correspondence of adjacent row or column.Certainly, this site 36 also can be that alternate manners such as matrix are regularly arranged.
If site 36 is not set in light guide plate 32 bottom surfaces 322 of backlight module 3 of the present invention, distribute with the bright dipping briliancy of contiguous light guide plate 32 light-emitting faces 321 of pointolite 31 and will be the radioactivity shape, cause that incident light presents the dark space than weak part between each pointolites 31 of contiguous light guide plate 32 light entrance faces 323, it is the zone between the light guide plate 32 adjacent light planes of incidence 323 each pointolite 31, there is similar leg-of-mutton dark space (A district) in the zone that reaches 324 of pointolite 31 and light guide plate 32 smooth mirrored sides, in addition, because near light mirrored sides 324 and more less, so should also have dark space (C district) in the zone away from other regional incident light of light entrance face 323.So, when the bottom surface 322 in this light guide plate 32 is provided with the site 36 that distributes according to the present invention, because it is big that the projected area of site 36 in this bottom surface 322 that will be close to light guide plate 32 light entrance faces 323 each 31 zone of pointolite designs than pointolite 31 near zones, can realize the whole evenly bright dipping of this light guide plate 32.
Backlight module second embodiment of the present invention such as Fig. 6, Fig. 7 and shown in Figure 8.This backlight module 4 comprises a plurality of pointolites 41 and a light guide plate 42, this light guide plate 42 comprises the many sites 46 on two light entrance faces 423, a light-emitting face 421, two light mirrored sides 424, a bottom surface 422 and the bottom surfaces 422, wherein, these a plurality of pointolites 41 are arranged at this light guide plate 42 light entrance faces 423, this light guide plate 42 is rectangular flats, and this light-emitting face 421 and bottom surface 422 are oppositely arranged.This embodiment is identical substantially with first embodiment, the light entrance face 423 of different is this second embodiment is two, certainly, light entrance face 423 also can be more than two, and a plurality of pointolites 41 are all arranged near this two light entrance face 423, and its number adds up to 6, certainly, also can be other numerical value, and arrange in these bottom surface 422 projected areas and depend on these a plurality of pointolite 41 numbers, distribution and its characteristics of luminescence in this site 46.
Seeing also Fig. 9, is the side view of light guide plate the 3rd embodiment of backlight module of the present invention, and this light guide plate 52 comprises the site 56 on a light entrance face 523, a light-emitting face 521, light mirrored sides 524, a bottom surface 522 and the bottom surface 522.Wherein, this light guide plate 52 is clapboards, and this light-emitting face 521 and bottom surface 522 are oppositely arranged, and this site 56 distributes similar with first embodiment of the invention in the projected area of this bottom surface 522.
Certainly, the light guide plate of backlight module of the present invention can also be other shape such as arc, bending plate etc., and this site also can be arranged at the light guide plate light-emitting face of backlight module of the present invention, and this site also can be spill on this bottom surface of light guide plate.
Claims (10)
1. a backlight module comprises a plurality of pointolites and a light guide plate, this light guide plate comprises a first surface, one and this first surface opposing second surface, a plurality of flank side surface and many diffusion units, this second surface is a light-emitting face, at least one flank side surface is a light entrance face, other flank side surface then is the light mirrored sides, these a plurality of pointolites are arranged at this light entrance face, this diffusion unit is arranged at this first surface, except that between contiguous each pointolite of this light entrance face the more weak zone of incident light, this diffusion unit is more little the closer to pointolite in other regional projected area of light guide plate, the closer to light mirrored sides and big more away from light entrance face more, it is characterized in that: each diffusion unit is relevant with these a plurality of pointolites in the projected area of this light guide plate first surface, and near the strong zone of the incident light of projected area ratio's pointolite of the diffusion unit in the more weak zone of incident light is big between contiguous each pointolite.
2. backlight module as claimed in claim 1 is characterized in that: this light guide plate is plate shaped, wedge shape, bending shape or arc.
3. backlight module as claimed in claim 1 or 2 is characterized in that: this diffusion unit is convex or spill on this light guide plate first surface.
4. backlight module as claimed in claim 1 or 2 is characterized in that: this diffusion unit is circle, ellipse or polygon in the projection of this light guide plate first surface.
5. backlight module as claimed in claim 1 or 2 is characterized in that: this diffusion unit is circle spherical surface body, ellipsoid or polyhedron.
6. backlight module as claimed in claim 2 is characterized in that: this diffusion unit shape is identical.
7. backlight module as claimed in claim 2 is characterized in that: this diffusion unit is that alternating expression is arranged.
8. backlight module as claimed in claim 1 is characterized in that: this diffusion unit is an arranged.
9. backlight module as claimed in claim 1 is characterized in that: this diffusion unit and this light guide plate are one-body molded.
10. backlight module as claimed in claim 1 is characterized in that: the bigger zone of diffusion unit projected area presents similar triangle or trapezoidal shape between each pointolite of this vicinity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031137938A CN100363810C (en) | 2003-02-20 | 2003-02-20 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031137938A CN100363810C (en) | 2003-02-20 | 2003-02-20 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1523426A CN1523426A (en) | 2004-08-25 |
| CN100363810C true CN100363810C (en) | 2008-01-23 |
Family
ID=34283812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031137938A Expired - Fee Related CN100363810C (en) | 2003-02-20 | 2003-02-20 | Backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100363810C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4238806B2 (en) * | 2004-09-21 | 2009-03-18 | セイコーエプソン株式会社 | Light guide plate, lighting device, electro-optical device, and electronic device |
| CN100445830C (en) * | 2005-06-02 | 2008-12-24 | 鸿富锦精密工业（深圳）有限公司 | Backlight module set |
| CN101025517B (en) * | 2006-02-24 | 2010-09-29 | 鸿富锦精密工业（深圳）有限公司 | Backlight module |
| CN102182964A (en) * | 2011-04-29 | 2011-09-14 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| JP5751988B2 (en) | 2011-08-26 | 2015-07-22 | 日立マクセル株式会社 | Illumination unit and display device using the same |
| CN102721995A (en) * | 2012-05-07 | 2012-10-10 | 青岛海信电器股份有限公司 | Light guide plate, backlight module and liquid crystal display device |
| CN102901055A (en) * | 2012-10-31 | 2013-01-30 | 深圳市华星光电技术有限公司 | Light guide plate and backlight module using same |
| CN113641038A (en) * | 2015-06-09 | 2021-11-12 | 瑞仪光电(苏州)有限公司 | Backlight module |
| US10705289B2 (en) * | 2018-06-14 | 2020-07-07 | Sharp Kabushiki Kaisha | Lighting device and display device |
| TWI709259B (en) * | 2019-07-10 | 2020-11-01 | 群光電能科技股份有限公司 | Light emitting device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11250714A (en) * | 1998-02-27 | 1999-09-17 | Omron Corp | Surface light source device |
| JP2000036208A (en) * | 1998-07-17 | 2000-02-02 | Nec Corp | Back lighting device |
| JP2000149635A (en) * | 1998-11-09 | 2000-05-30 | Matsushita Electric Ind Co Ltd | Surface lighting system and display device using same |
| US20020054488A1 (en) * | 2000-08-11 | 2002-05-09 | Enplas Corporation | Light guide plate, surface light source device and display |
| JP2002258022A (en) * | 2001-02-27 | 2002-09-11 | Yuka Denshi Co Ltd | Light reflection sheet and surface light source device and liquid crystal display both using the light reflection sheet |
-
2003
- 2003-02-20 CN CNB031137938A patent/CN100363810C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11250714A (en) * | 1998-02-27 | 1999-09-17 | Omron Corp | Surface light source device |
| JP2000036208A (en) * | 1998-07-17 | 2000-02-02 | Nec Corp | Back lighting device |
| JP2000149635A (en) * | 1998-11-09 | 2000-05-30 | Matsushita Electric Ind Co Ltd | Surface lighting system and display device using same |
| US20020054488A1 (en) * | 2000-08-11 | 2002-05-09 | Enplas Corporation | Light guide plate, surface light source device and display |
| JP2002258022A (en) * | 2001-02-27 | 2002-09-11 | Yuka Denshi Co Ltd | Light reflection sheet and surface light source device and liquid crystal display both using the light reflection sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1523426A (en) | 2004-08-25 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080123 Termination date: 20180220 |
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| CF01 | Termination of patent right due to non-payment of annual fee |