CN1508572A - Light board and planar light-emitting device - Google Patents
Light board and planar light-emitting device Download PDFInfo
- Publication number
- CN1508572A CN1508572A CNA021497117A CN02149711A CN1508572A CN 1508572 A CN1508572 A CN 1508572A CN A021497117 A CNA021497117 A CN A021497117A CN 02149711 A CN02149711 A CN 02149711A CN 1508572 A CN1508572 A CN 1508572A
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- China
- Prior art keywords
- guide plate
- light guide
- light
- diffusion unit
- coordinate
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- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention is a kind of light board and the flat brighten device, the light board includes the first surface, the second surface, several side faces, and several scattering units. The second surface is light exit face, the scattering unit is set on the first surface, and at least one of the several side faces at least is entrance face. The projecting area of the scattering unit on the first surface is in direction ratio to reciprocal quadratic sum of distance between the unit and each coordinate. The scattering unit can improve the evenness degree.
Description
[technical field]
The present invention relates to the planar emission apparatus of a kind of light guide plate and this light guide plate of employing, especially relate to a kind of planar emission apparatus that has the light guide plate of network point distribution and use this light guide plate.
[background technology]
Because the liquid crystal itself in the panel of LCD is not had a characteristics of luminescence, so,, need to give the LCD panel that one planar light source device is provided for reaching display effect, as planar emission apparatus, its function is area source abundant to panel of LCD supply briliancy and that be evenly distributed.
The prior art planar emission apparatus 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 exiting surface of light guide plate.Because the light that light source sends is to enter from the light guide plate side, so light guide plate is brighter near the part of light source, and 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 exiting surface 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 light guide plate with bottom surface network point distribution as depicted in figs. 1 and 2, it is exposed in No. the 5th, 363,294, the United States Patent (USP) of bulletin on November 8th, 1994.This patent discloses a planar light source device, this planar light source device comprises a light guide plate 22, a line source 21, a diffuser plate 27 and two reflecting plates 25,29, this light guide plate 22 comprises a light entrance face 223, light-emitting face 221, end face 224 and bottom surface 222, this line source 21 is positioned at this light guide plate 22 light entrance faces 223 1 sides, this reflecting plate 29 is arranged at this end face 224 1 sides, these diffuser plate 27 relative these light-emitting faces 221 are provided with, and these reflecting plate 25 relative these bottom surfaces 222 are provided with.Wherein, one reflection lampshade 28 is set around this line source 21 for the light that effectively utilizes line source 21 to be sent.These light guide plate 22 bottom surfaces are provided with many sites 26 that the ranks shape is arranged that are.
Seeing also Fig. 2, is the distribution schematic diagram of this site 26 in these light guide plate 22 bottom surfaces 222.The direction of these 26 edges, site and line source 21 axially parallels is lined up multiple row, and site 26 big or small identical in each row.Multirow is lined up with line source 21 axial vertical directions in these 26 edges, site, and the varying in size of site 26 in each row, wherein, near site 26 minimums of line source 21, along with and line source 21 between the increase of distance, this site 26 is linear to become big gradually.Owing to the increase along with transmission range of the intensity of line source 21 emitted lights reduces, and light guide plate 22 is posted reflecting plate 29 (as shown in Figure 1) away from an end face of line source 21,29 pairs of reflections that are incident upon its glazed thread of this reflecting plate, causing these light guide plate 22 interior light intensities is not to reach minimum at the end face 224 away from line source 21, and its minimum light line strength present position is between light entrance face 223 and end face 224 and near this end face 224.The minimum place of the size of this site 26 light intensity in this light guide plate 22 reaches maximum, and thereupon with constant size distribution to the end face 224 of this light guide plate 22 away from line source 21.
This light guide plate 22 can solve near the part of light source luminous brighter substantially, and away from the luminous darker technical matters of the Lights section, but, because the light that sends of line source 21 is in light guide plate 22 in the transmission course, usually repeatedly reflection between light guide plate 22 light-emitting faces 221 and bottom surface 222, its actual light line strength and nonlinear relationship in light guide plate 22 changes.This site 26 still is difficult to realize the complete uniformity of whole light guide plate 22 luminous exitances at the linear distribution of these light guide plate 22 bottom surfaces 222.
In addition, because the cold cathode fluorescent lamp (CCFL) as line source 21 has certain-length, the part near line source 21 two ends is many for the light that light guide plate 22 is accepted near the part at line source 21 centers, and, low in the middle of the brightness ratio of cold cathode fluorescent lamp two ends near the electrode part, cause light guide plate 22 lower than the luminosity of close line source 21 cores, thereby influence the optical property of this light guide plate near the luminosity of line source 21 two end portions.
Equally, adopt the luminous uniformity coefficient of planar emission apparatus of light guide plate of above-mentioned line of engagement light source also lower.
[summary of the invention]
The defective of non-uniform light the invention provides a kind of light guide plate and planar emission apparatus with higher luminous uniformity coefficient line of engagement light source when adopting line source as light source in order to overcome prior art light guide plate and planar emission apparatus.
The technical scheme that technical solution problem of the present invention is adopted is: a light guide plate is provided, and this light guide plate comprises a first surface, one and this first surface opposing second surface, a plurality of flank side surface and a plurality of diffusion unit.Wherein, this second surface is a light-emitting face, this diffusion unit is arranged on this first surface, these a plurality of flank side surface have at least one to be light entrance face, the inverse distance quadratic sum of each diffusion unit each coordinate points in the projected area of this first surface and itself and these a plurality of flank side surface or in outer at least one coordinate points set is directly proportional.
The present invention provides a kind of planar emission apparatus simultaneously, and this planar emission apparatus comprises an at least one line source and an above-mentioned light guide plate.
Compare with prior art, the present invention has the following advantages: it is proportional that intensity is derived at the light of the projected area of this bottom surface and light-emitting face corresponding region in the site of bottom surface of light guide plate of the present invention, can make the light guide plate of line sources such as this cooperations cold-cathode fluorescence lamp and adopt the planar emission apparatus of this light guide plate luminous even.
[description of drawings]
Fig. 1 is the side view of prior art planar light source device.
Fig. 2 is the network point distribution synoptic diagram of bottom surface of light guide plate shown in Figure 1.
Fig. 3 is the side view of light guide plate first embodiment of the present invention.
Fig. 4 is the network point distribution synoptic diagram of bottom surface of light guide plate shown in Figure 3.
Fig. 5 is the synoptic diagram that adopts the planar emission apparatus of light guide plate first embodiment of the present invention.
Fig. 6 is the side view of light guide plate second embodiment of the present invention.
Fig. 7 is the synoptic diagram of the network point distribution of bottom surface of light guide plate shown in Figure 6.
Fig. 8 is the side view of light guide plate the 3rd embodiment of the present invention.
[embodiment]
Please consulting Fig. 3 and Fig. 4 together, is the side view of light guide plate first embodiment of the present invention and the network point distribution synoptic diagram of bottom surface.This light guide plate 32 comprises a light entrance face 323, a light-emitting face 321, a plurality of light reflection surface 324, a bottom surface 322 and a plurality of light diffusion site 36 that is distributed in bottom surface 322.Wherein, this light guide plate 32 is rectangular flats, and this light-emitting face 321 and bottom surface 322 are to be oppositely arranged.
This light guide plate 32 is to make with transparent material such as acryl resin, polycarbonate, polyvinyl resin or glass etc.This light entrance face 323 receives from the light source light of (figure does not show), 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 reflection surface 324 will be incident upon light reflected back light guide plate 32 on it from by these light-emitting face 321 outgoing, cause damage from these light reflection surface 324 outgoing to prevent light.Light reflection surface 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 from light-emitting face 321 outgoing.
This site 36 is the outgoing light homogeneity that are used for improving this light guide plate 32, and it is other light diffusion unit also, as prism structure etc.This site 36 can make by the method for printing or ejection formation.This site 36 is circle spherical surface body, and its projection in light guide plate 32 bottom surfaces 322 is circular, and certainly, this site 36 also can be ellipsoid, polyhedron, cone or the most advanced and sophisticated taper platform etc. of pruning, its in the bottom surface 322 projection also corresponding can be ellipse or polygon.This site 36 is a convex on this bottom surface 322.This site 36 presents the ranks distribution of shapes on the bottom surface 322 of this light guide plate 32, wherein, the edge is provided with many row site 36 with light entrance face 323 parallel directions (being denoted as Y among the figure) with proportional spacing, and the edge is provided with many capable sites 36 with light entrance face 323 vertical directions (being denoted as X among the figure) with proportional spacing.In order further to strengthen the effect of the 36 pairs of light in site, also can stagger the hemistich distance respectively and present the alternating expression distribution with light entrance face 323 parallel and adjacent odd column and even column sites 36, certainly, this site 36 also can be otherwise regularly arranged.
The inverse distance that site 36 and itself and this light entrance face 323 outer at least one coordinate points are gathered each coordinate points in 37 square is directly proportional, and the radius size R of each site 36 satisfies formula:
Wherein, (xs
i, ys
i) and (X Y) belongs to a rectangular coordinate system, (xs
i, ys
i) be the coordinate of respective coordinates point set 37 initiating terminals, (X is Y) with (l
iCos θ
i+ xs
i, l
iSin θ
i+ ys
i) being respectively the coordinate of each coordinate points in this rectangular coordinate system in site 36 and the set 37 of respective coordinates point, n is the number of coordinate points set 37, for present embodiment, n is 1, L
iBe the length of respective coordinates point set 37, θ
iBe the angle of cut of set 37 of respective coordinates point and X coordinate axis, i is a natural number, r
0With k be constant, corresponding to the light guide plate of different size, different coordinate points is gathered 37 quantity has different k value and r with the position
0Value.
When light guide plate 32 of the present invention is used for planar emission apparatus, if site 36 is not set in its bottom surface 322, then in it light to derive intensity far away more weak more from light source, the light guide plate part between light source luminous relatively a little less than, the light guide plate side edge luminous intensity that does not have a light source also a little less than.And when the site 36 that distributes according to the present invention being set in the bottom surface 322 of this light guide plate 32, because it is proportional that intensity is derived at the light of the projected area of this bottom surface 322 and light-emitting face 321 corresponding regions in site 36, exactly can realize the whole uniformly light-emitting of this light guide plate 32.
Please refer to Fig. 5, is the synoptic diagram that adopts planar emission apparatus one embodiment of light guide plate of the present invention.This planar emission apparatus comprises light guide plate 32 and is arranged on the light source 31 of its side that as a plurality of cold-cathode fluorescence lamps, these light guide plate 32 bottom surfaces 322 are provided with reflecting plate or reflectance coating (figure does not show).Light penetrates from light source 31, enter a part of light in light guide plate 32 backs and on the site 36 of bottom surface 322, carry out scattering and reflection, in the reflecting plate or reflectance coating reflected back light guide plate 32 that is provided with by these light guide plate 32 bottom surfaces by the light of bottom surface 322 outgoing, thereby can realize the whole uniformly light-emitting of this planar emission apparatus.
Second embodiment of light guide plate of the present invention as shown in Figure 6 and Figure 7.This light guide plate 42 comprises the site 46 on two light entrance faces 423, a light-emitting face 421, light reflection surface 424, a bottom surface 422 and the bottom surface 422.Wherein, this light guide plate 42 is rectangular flats, and this light-emitting face 421 and bottom surface 422 are to be oppositely arranged.This embodiment and first embodiment are basic identical, and difference is that the light entrance face 423 of second embodiment is two, and certainly, light entrance face 423 also can be more than two.Coordinate points set 47 is all arranged near this two light entrance face 423, its number adds up to 6, certainly, also can be other numerical value, and arrange in the projected area of this bottom surface 422 and depend on that this coordinate points gathers the distance of 47 numbers and the set 47 of each coordinate points and this site 46 in this site 46.
When present embodiment light guide plate 42 is used for planar emission apparatus, if site 46 is not set in its bottom surface 422, then in it light to derive intensity far away more weak more from light source, light guide plate 42 be positioned at part between light source luminous relatively a little less than, the light guide plate 42 side edge luminous intensities that do not have a light source also a little less than.And when the site 46 that distributes according to the present invention is set in these light guide plate 42 bottom surfaces 422, because it is proportional that intensity is derived at the light of the projected area of this bottom surface 422 and light-emitting face 421 corresponding regions in site 46, exactly can realize this light guide plate 42 whole uniformly light-emittings.
Seeing also Fig. 8, is the side view of light guide plate the 3rd embodiment 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 reflection surface 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 to be oppositely arranged, and the projected area of this site 56 on this bottom surface 522 distributes similar with first embodiment of the invention.
Certainly, light guide plate of the present invention can also be other shape such as arc, bending plate etc., this site also can be arranged on the light-emitting face of light guide plate of the present invention, and this site also can be spill on this bottom surface of light guide plate, and this coordinate points set also can be arranged in the light entrance face of this light guide plate.
When above-mentioned light guide plate is used for planar emission apparatus, in the light guide plate flank side surface or outer coordinate points set place can place line source, as cold-cathode fluorescence lamp.
Claims (10)
1. light guide plate, it comprises: a first surface, one and this first surface opposing second surface, a plurality of flank side surface, a plurality of diffusion unit, this second surface is a light-emitting face, these a plurality of flank side surface have at least one to be light entrance face, this diffusion unit is arranged at this first surface, it is characterized in that: each diffusion unit in the projected area of this light guide plate first surface and itself and these a plurality of flank side surface or outer at least one coordinate points gather in the inverse distance quadratic sum of each coordinate points be directly proportional.
2. light guide plate as claimed in claim 1 is characterized in that: the diffusion unit on this light guide plate first surface is convex or spill.
3. light guide plate as claimed in claim 1 is characterized in that: this diffusion unit is circular in the projection of this light guide plate first surface.
4. light guide plate as claimed in claim 1 is characterized in that: this diffusion unit is ellipse or polygon in the projection of this light guide plate first surface.
5. light guide plate as claimed in claim 1 is characterized in that: this diffusion unit is circle spherical surface body, ellipsoid or a polyhedron.
6. light guide plate as claimed in claim 1 is characterized in that: this diffusion unit shape is roughly the same.
7. light guide plate as claimed in claim 1 is characterized in that: this diffusion unit is an arranged.
8. light guide plate as claimed in claim 1 is characterized in that: this first surface and this diffusion unit are one-body molded.
9. light guide plate as claimed in claim 3 is characterized in that: this diffusion unit at the circular radius R of the projection of this first surface is:
Wherein, (xs
i, ys
i) and (X Y) belongs to a rectangular coordinate system, (xs
i, ys
i) be that respective coordinates is put the coordinate at top together, (X is Y) with (l
iCos θ
i+ xs
i, l
iSin θ
i+ ys
i) being respectively the coordinate of each coordinate points in this rectangular coordinate system in diffusion unit and the set of respective coordinates point, n is the number of coordinate points set, L
iBe the length of respective coordinates point set, θ
iBe the angle of cut of set of respective coordinates point and X coordinate axis, i is a natural number, r
0With k be constant, corresponding to the light guide plate of different size, different coordinate points set quantity have different k value and r with the position
0Value.
10. a planar emission apparatus comprises a line source and a light guide plate, and this line source is arranged at this light guide plate light entrance face one side, it is characterized in that: this light guide plate is as each described light guide plate of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021497117A CN1307438C (en) | 2002-12-20 | 2002-12-20 | Light board and planar light-emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021497117A CN1307438C (en) | 2002-12-20 | 2002-12-20 | Light board and planar light-emitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508572A true CN1508572A (en) | 2004-06-30 |
| CN1307438C CN1307438C (en) | 2007-03-28 |
Family
ID=34233759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021497117A Expired - Fee Related CN1307438C (en) | 2002-12-20 | 2002-12-20 | Light board and planar light-emitting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1307438C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102681084A (en) * | 2012-05-04 | 2012-09-19 | 上海向隆电子科技有限公司 | Light guide plate and light source module thereof |
| CN103308975A (en) * | 2013-07-08 | 2013-09-18 | 苏州天华有色金属制品有限公司 | Light guide plate with light incident bilateral sides |
| CN103901522A (en) * | 2012-12-27 | 2014-07-02 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and backlight module |
| CN108627905A (en) * | 2017-03-17 | 2018-10-09 | 江苏日月照明电器有限公司 | A kind of light guide plate mesh point arrangement that outgoing light homogeneity is high |
| CN110598657A (en) * | 2019-09-18 | 2019-12-20 | Oppo广东移动通信有限公司 | Optical fingerprint identification electronic equipment under screen |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH035726A (en) * | 1989-06-02 | 1991-01-11 | Mitsubishi Petrochem Co Ltd | Backlighting device |
| US5283673A (en) * | 1989-09-30 | 1994-02-01 | Kabushiki Kaisha Meitaku Shisutemu | Surface luminous source panel with areas having different reflector speck densities |
| JP3918281B2 (en) * | 1998-02-18 | 2007-05-23 | オムロン株式会社 | Surface light source device |
| US6425673B1 (en) * | 1999-09-20 | 2002-07-30 | Mitsubisshi Chemical Corporation | Light guide pipe having elongate roughened protrusions and/or roughened concaves, planar light source unit having a broad viewing angle characteristic, and liquid crystal display device |
| CN2457630Y (en) * | 2000-08-17 | 2001-10-31 | 中强光电股份有限公司 | Back light device |
-
2002
- 2002-12-20 CN CNB021497117A patent/CN1307438C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102681084A (en) * | 2012-05-04 | 2012-09-19 | 上海向隆电子科技有限公司 | Light guide plate and light source module thereof |
| CN103901522A (en) * | 2012-12-27 | 2014-07-02 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and backlight module |
| CN103308975A (en) * | 2013-07-08 | 2013-09-18 | 苏州天华有色金属制品有限公司 | Light guide plate with light incident bilateral sides |
| CN108627905A (en) * | 2017-03-17 | 2018-10-09 | 江苏日月照明电器有限公司 | A kind of light guide plate mesh point arrangement that outgoing light homogeneity is high |
| CN110598657A (en) * | 2019-09-18 | 2019-12-20 | Oppo广东移动通信有限公司 | Optical fingerprint identification electronic equipment under screen |
| CN110598657B (en) * | 2019-09-18 | 2022-04-22 | Oppo广东移动通信有限公司 | Optical fingerprint identification electronic equipment under screen |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1307438C (en) | 2007-03-28 |
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Granted publication date: 20070328 Termination date: 20151220 |
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