CN101661130A - Light guide plate - Google Patents
Light guide plate Download PDFInfo
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- CN101661130A CN101661130A CN200810119456A CN200810119456A CN101661130A CN 101661130 A CN101661130 A CN 101661130A CN 200810119456 A CN200810119456 A CN 200810119456A CN 200810119456 A CN200810119456 A CN 200810119456A CN 101661130 A CN101661130 A CN 101661130A
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- light guide
- guide plate
- light
- prism
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Abstract
The invention discloses a light guide plate, which comprises an entrance prism and a light guide module, wherein the entrance prism is used for increasing or reducing the diffusion angle of light rayscoupled into the light guide plate; the light guide module is connected to transmit light rays fed by the entrance prism; the longitudinal section of the entrance prism is smooth curve protruding orsinking toward a light source; and the horizontal section of the entrance prism is in a saw toothed shape. In the light guide plate, the longitudinal section of the entrance prism is made into the smooth curved surface which is protruding toward the outer side of the light guide plate or sinking toward the inner side of the light guide plate so as to change the diffusion angle of the light rays, wherein the curved surface protruding toward the outer side of the light guide plate can be used for eliminating bright spots formed on the light guide plate and the curved surface sinking toward the inner side of the light guide plate can improve the utilization rate of the light rays and can be used to manufacture highlight light guide plate; and the horizontal section of the entrance prism is made in a saw toothed shape to eliminate dark spots between two adjacent light sources.
Description
Technical field
The present invention relates to a kind of light guide plate, relate in particular to the light guide plate that a kind of incidence surface has projection or sunk structure.
Background technology
Light guide plate is the critical piece that in the light source of the middle-size and small-size back side pointolite or line source is converted into area source, can be applicable in the flat-panel display devices such as LCD, notebook computer, digital camera, monitor and projector, be used to provide the area source output of uniform luminance, make normally show image of flat-panel display devices.The increasing light source of light emitting diode (Light Emitting Diode is called for short LED) as light guide plate in the light source of the back side.
Fig. 1 is that LED is as the light guide plate optical model of light source in the prior art, and Fig. 2 is the longitdinal cross-section diagram of light travel path in light guide plate in the prior art.As Fig. 1, shown in Figure 2, inject from the plane of inlet of light guide plate 4 from the light that led light source 1 sends, and along the propagation of the light ray propagation path 2 (direction of arrow) in the light guide plate 4, the light diffuse reflection takes place through the reflection-type site 3 of light guide plate 4 lower surfaces in light, thereby light is the upper surface along a plurality of propagated to light guide plate behind reflection-type site 3, refraction effect takes place through behind the upper surface of light guide plate in light, pass diffusion sheet 5 through a plurality of travel paths again with equal light action, and has the light harvesting work in order to brightness that improves light source and the brightening piece 6 of all spending together, last penetrate along direction perpendicular to display panel 7, and on display panel 7 show image.When light when a plurality of led light sources penetrate, under the constant situation of adjacent two led light source spacing distances, because light is through the reflection and the refraction action of light guide plate, in light guide plate, export along certain travel path, if when adjacent two led light sources distance was big, the blackening on the light guide plate between two led light sources was apparent in view.
But there is following defective in prior art: because very strong from the nearer light guide plate glazed thread of led light source, cause light guide plate speck to occur near the led light source side, gap location at adjacent two led light sources, because light is less, easily form blackening on light guide plate, speck and blackening make the light guide plate area source form so-called " firefly " phenomenon.Common way is to adjust the density of site, and keeps certain distance to eliminate " firefly " phenomenon between the reflection-type dot area of light guide plate lower surface and led light source, can increase the volume of backlight assembly.
Summary of the invention
The object of the present invention is to provide a kind of light guide plate, can be implemented under the situation that does not increase led light source number and change light guide plate volume, avoid the generation of speck and blackening.
For achieving the above object, the invention provides a kind of light guide plate, comprising:
The inlet prism is used to increase or reduce to be coupled into the spread angle of light guide plate light;
Light guide module is conducted with described inlet prism, is used to propagate the light that the inlet prism imports.
The longitudinal cross-section of described inlet prism is a smooth curve.Described smooth curve is the circular arc towards light guide plate outside projection.Described smooth curve is the circular arc towards the inboard depression of light guide plate.
The longitudinal cross-section of described inlet prism is a broken line.Described broken line is the broken line towards light guide plate outside projection.Described broken line is the broken line towards the inboard depression of light guide plate.
The horizontal section of described inlet prism is a serrate.
Light guide plate provided by the invention is arranged to change the spread angle of light towards light guide plate outside projection or towards the inboard smooth surface that caves in of light guide plate by the longitudinal cross-section of the prism that will enter the mouth.Curved surface towards light guide plate outside projection can be used for eliminating the speck that forms on the light guide plate, can improve the utilization factor of light towards the inboard curved surface that caves in of light guide plate, and can be used for making highlighted light guide plate; Horizontal section by the prism that will enter the mouth is arranged to serrate, can eliminate dark spots between two adjacent light sources.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 be in the prior art LED as the light guide plate optical model of light source;
Fig. 2 is the longitdinal cross-section diagram of light travel path in light guide plate in the prior art;
Fig. 3 is the longitdinal cross-section diagram of light of the present invention travel path embodiment one in light guide plate;
Fig. 4 is the longitdinal cross-section diagram of light of the present invention travel path embodiment two in light guide plate;
Fig. 5 is the longitdinal cross-section diagram of light of the present invention travel path embodiment three in light guide plate;
Fig. 6 is the longitdinal cross-section diagram of light of the present invention travel path embodiment four in light guide plate;
Fig. 7 a is the 3 D stereo synoptic diagram of light guide plate embodiment of the present invention;
Fig. 7 b is the horizon-slice map of Fig. 7 a.
Description of reference numerals:
The 1-LED light source; 2-light ray propagation path; 3-reflection-type site; The 4-light guide plate;
The 5-diffusion sheet; The 6-brightening piece; The 7-display panel; The 8-prism that enters the mouth;
The 9-light guide module.
Embodiment
Fig. 3 is the longitdinal cross-section diagram of light of the present invention travel path embodiment one in light guide plate.As shown in Figure 3, light guide plate comprises inlet prism 8, the light guide module 9 that is connected with inlet prism 8.Wherein the enter the mouth longitudinal cross-section of prism 8 is the level and smooth semi arch towards led light source 1 (be light guide plate outside the) projection, is used to reduce to be coupled into the spread angle of light guide plate light.So-called longitudinal cross-section is meant the plane cutting light guide plate formed light guide plate planar graph parallel with the side view of light guide plate.Also can the longitudinal cross-section of inlet prism 8 be arranged to the circular arc of other radian according to actual needs.
In the present embodiment one, the detailed process of light guide plate propagating light is: light from led light source 1 along the light ray propagation propagated shown in the arrow the figure, the refraction of light takes place on the surface of inlet prism 8, the prism 8 that enters the mouth this moment is the smooth surface towards light guide plate outside projection, effect with convex lens, the diffusion angle of incident ray is diminished, play light and converge effect; The refraction of light takes place in light on the surface of inlet prism 8, continue to carry out reflections propagate in the upper and lower surface of light guide module 9.Compare as can be known with the travel path of light in light guide plate in the prior art shown in Figure 2, the inlet prism 8 of present embodiment one light guide plate plays light and converges effect, the diffusion angle of light in light guide module 9 diminishes, in part near led light source 1, the light that reflexes to the reflection-type site of light guide plate lower surface reduces, thereby has eliminated the speck of close led light source 1 side on the light guide plate; Because inlet prism 8 has then reduced the dead volume between light guide plate and the light source towards the light source projection.
Fig. 4 is the longitdinal cross-section diagram of light of the present invention travel path embodiment two in light guide plate.As shown in Figure 4, different with the foregoing description one is, the longitudinal cross-section of the inlet prism 8 of present embodiment two is the broken line towards led light source 1 (being the light guide plate outside) projection, and this broken line is made up of two straight-line segments that intersect at end points.Can be according to actual needs, the longitudinal cross-section of inlet prism 8 is arranged to the broken line of forming by the straight-line segment that intersects at end points successively more than two.
In present embodiment two, the longitudinal cross-section of inlet prism 8 is two broken lines that the straight-line segment that intersects at end points is formed, and towards light guide plate outside projection, makes inlet prism 8 can play the effect identical with the foregoing description one, reaches identical effect; In addition, the longitudinal cross-section can also allow the light on the light source principal direction not cause light to penetrate from the end face away from light source through not departing from the former direction of propagation behind the light guide plate module for the inlet prism 8 towards the protruding broken line in the light guide plate outside, by changing the direction of propagation of light, light is penetrated from light guide plate is positive, thereby light is fully used.
Fig. 5 is the longitdinal cross-section diagram of light of the present invention travel path embodiment three in light guide plate.As shown in Figure 5, the longitudinal cross-section of inlet prism 8 is used to increase the spread angle that is coupled into light guide plate light for the level and smooth semi arch towards led light source 1 (being the light guide plate inboard) depression.Equally, can according to actual needs the longitudinal cross-section of inlet prism 8 be arranged to the depression circular arc towards the light guide plate inboard of other radian.
In the present embodiment three, the detailed process of light guide plate propagating light is: light is propagated along the direction of arrow in the figure from led light source 1, the refraction of light takes place on the surface of inlet prism 8, the prism 8 that enters the mouth this moment is the level and smooth semi arch towards the inboard depression of light guide plate, effect is equivalent to concavees lens, the spread angle of incident ray is become big, play the divergence of beam effect; Light continues to propagate at the upper and lower surface generation reflection of light of light guide module 9 and in light guide module 9 after the refraction of light takes place on the surface of inlet prism 8.Compare as can be known with the travel path of light in light guide plate in the prior art shown in Figure 2, the inlet prism 8 of present embodiment three plays the divergence of beam effect, the diffusion angle of light in light guide module 9 becomes big, a large amount of light concentrates on the side of light guide plate near led light source 1, reduced the propagation distance of light in light guide module 9, thereby improved the utilization factor of light, so present embodiment three can be made the highlighted light guide plate area source of small size.
Fig. 6 is the longitdinal cross-section diagram of light of the present invention travel path embodiment four in light guide plate.As shown in Figure 6, the longitudinal cross-section of inlet prism 8 is the broken line towards led light source 1 (being the light guide plate inboard) depression, and this broken line is made up of two straight-line segments that intersect at end points.Can be according to actual needs, the longitudinal cross-section of inlet prism 8 is arranged to the broken line of forming by the straight-line segment that intersects at end points successively more than two.
In the present embodiment four, inlet prism 8 can play the effect identical with the foregoing description three, reaches identical effect, does not repeat them here.
Fig. 7 a is the 3 D stereo synoptic diagram of light guide plate embodiment of the present invention, and Fig. 7 b is the horizon-slice map of Fig. 7 a.Shown in Fig. 7 a, Fig. 7 b, further understand the detailed structure of light guide plate of the present invention, inlet prism 8 towards light guide plate outside projection, is used to reduce to be coupled into the spread angle of light guide plate light in light guide plate one side; Inlet prism 8 is conducted with light guide module 9; The horizon-slice map of inlet prism 8 is a serrate.So-called horizontal section is meant the formed light guide plate planimetric map of water plane cutting light guide plate.When light when light source penetrates, the refraction of light takes place in light on the surface of inlet prism 8, inlet prism 8 diminishes the spread angle of incident ray, plays light and converges effect, has eliminated on the light guide plate speck near light source side; Zigzag inlet prism 8 plays disperse function to light in the horizontal direction, therefore the light of two adjacent light sources is in the horizontal direction through after dispersing, the brightness of two light source gap locations increases, and has eliminated the blackening that forms owing to insufficient light between the two adjacent light sources.
It is towards the circular arc of light guide plate inboard depression or towards the broken line of light guide plate outside projection or the broken line that caves in towards the light guide plate inboard that inlet prism 8 in the 3 D stereo synoptic diagram of light guide plate embodiment of the present invention also can be arranged to the longitudinal cross-section, the prism 8 that will enter the mouth simultaneously is arranged to serrate in the horizontal direction, all can be used as the 3 D stereo synoptic diagram of light guide plate embodiment of the present invention.In actual applications, can different shapes be set according to will the enter the mouth longitudinal cross-section of prism of actual needs.
Light guide plate provided by the invention, be arranged to towards the protruding smooth surface in the light guide plate outside by the longitudinal cross-section of the prism that will enter the mouth, the incident angle of light is diminished, increased the propagation distance of light in light guide plate, eliminated the speck of close light source side on the light guide plate; Be arranged to towards the inboard smooth surface that caves in of light guide plate by the longitudinal cross-section of the prism that will enter the mouth, the incident angle of light is become big, a large amount of light is concentrated on light guide plate near the light source place, improved the utilization factor of light, can make the light guide plate area source of small size high brightness; Horizontal section by the prism that will enter the mouth is arranged to serrate, can eliminate dark spots between two adjacent light sources.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1, a kind of light guide plate is characterized in that, comprising:
The inlet prism is used to increase or reduce to be coupled into the spread angle of light guide plate light;
Light guide module is conducted with described inlet prism, is used to propagate the light that the inlet prism imports.
2, light guide plate according to claim 1 is characterized in that, the longitudinal cross-section of described inlet prism is a smooth curve.
3, light guide plate according to claim 2 is characterized in that, described smooth curve is the circular arc towards light guide plate outside projection.
4, light guide plate according to claim 2 is characterized in that, described smooth curve is the circular arc towards the inboard depression of light guide plate.
5, light guide plate according to claim 1 is characterized in that, the longitudinal cross-section of described inlet prism is a broken line.
6, light guide plate according to claim 5 is characterized in that, described broken line is the broken line towards light guide plate outside projection.
7, light guide plate according to claim 5 is characterized in that, described broken line is the broken line towards the inboard depression of light guide plate.
According to the arbitrary described light guide plate of claim 1-7, it is characterized in that 8, the horizontal section of described inlet prism is a serrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810119456A CN101661130A (en) | 2008-08-29 | 2008-08-29 | Light guide plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810119456A CN101661130A (en) | 2008-08-29 | 2008-08-29 | Light guide plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101661130A true CN101661130A (en) | 2010-03-03 |
Family
ID=41789259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810119456A Pending CN101661130A (en) | 2008-08-29 | 2008-08-29 | Light guide plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101661130A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914907A (en) * | 2011-08-03 | 2013-02-06 | 株式会社日本显示器东 | Display device |
| CN104656183A (en) * | 2015-03-10 | 2015-05-27 | 京东方科技集团股份有限公司 | Light guide plate component and display device |
-
2008
- 2008-08-29 CN CN200810119456A patent/CN101661130A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914907A (en) * | 2011-08-03 | 2013-02-06 | 株式会社日本显示器东 | Display device |
| CN102914907B (en) * | 2011-08-03 | 2016-03-16 | 株式会社日本显示器 | Display device |
| CN104656183A (en) * | 2015-03-10 | 2015-05-27 | 京东方科技集团股份有限公司 | Light guide plate component and display device |
| WO2016141669A1 (en) * | 2015-03-10 | 2016-09-15 | 京东方科技集团股份有限公司 | Light guide plate assembly and display device |
| CN104656183B (en) * | 2015-03-10 | 2017-09-01 | 京东方科技集团股份有限公司 | Light guide plate assembly and display device |
| US10126483B2 (en) | 2015-03-10 | 2018-11-13 | Boe Technology Group Co., Ltd. | Light guide plate assembly and display apparatus |
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Application publication date: 20100303 |