CN101566703B - Submicron grating light guide plate and backlight module - Google Patents
Submicron grating light guide plate and backlight module Download PDFInfo
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- CN101566703B CN101566703B CN2009100862337A CN200910086233A CN101566703B CN 101566703 B CN101566703 B CN 101566703B CN 2009100862337 A CN2009100862337 A CN 2009100862337A CN 200910086233 A CN200910086233 A CN 200910086233A CN 101566703 B CN101566703 B CN 101566703B
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Abstract
The invention relates to a submicron grating light guide plate and a backlight module, belonging to the technical field of optical liquid crystal display. The invention discloses a submicron grating light guide plate suitable for realizing even backlight illumination. A light emitting surface of the light guide plate is designed into a submicron grating structure, and the grating period is in submicron dimension and distributed segmentally. Based on a principle that reflected-diffracted light exists when a grating diffracts incident light, a submicron grating selectively reflects the light energy in an area with more intense illumination on the light emitting surface of the light guide plate back into the light guide plate so as to cause the light energy to spread inside the light guide plate and to be emitted out of the light guide plate from an area with weaker illumination on the light emitting surface of the light guide plate, thereby evening the light energy distribution on the light emitting surface and realizing even illumination. The submicron grating light guide plate and the backlight module have simple structure and remarkable application effect. When being used for realizing even backlight illumination, the submicron grating light guide plate can replace scattering network nodes and a scattering plate in the prior art, thus reducing the scattering and absorption andimproving the light energy utilization rate.
Description
Technical field
The present invention relates to a kind of submicron grating light guide plate of realizing even illumination, and the module backlight that adopts this submicron grating light guide plate.
Background technology
Because liquid crystal itself is not luminous, therefore needing a module backlight is the back lighting that LCD provides enough brightness and uniform illumination.
A kind of module backlight of prior art as shown in Figure 1, this module backlight 10 is formed liquid crystal indicators 100 with liquid crystal panel 20.This module 10 backlight comprises light source 11, first reflecting plate 12, second reflecting plate 13, the 3rd reflecting plate 14, light guide plate 15, scatter plate 16, prismatic lens 17, wherein light guide plate 15 comprises leaded light matrix 151, incidence surface 152, lower surface 153, cross section 154, exiting surface 155, scattering netted dot 18 is set on the lower surface 153, is close to incidence surface 152, lower surface 153, cross section 154 first reflecting plate 12, second reflecting plate 13, the 3rd reflecting plate 14 are set respectively.The upper surface of this liquid crystal panel 20 is provided with color filter 21, upper polarizer 22, and the lower surface of liquid crystal panel 20 is provided with down polaroid 23.The incidence surface 152 of these light source 11 relative light guide plate 15 is provided with, and this light guide plate 15, scatter plate 16, prismatic lens 17 are cascading.This liquid crystal panel 20 is positioned at the top of module 10 backlight.
In existing module 10 backlight, after the light that light source 11 sends was coupled into leaded light matrix 151 from incidence surface 152, scattering can take place in the light that shines on the scattering netted dot 18, and from exiting surface 155 upwards outgoing; Be scattered that the illumination uniformity of exiting surface 154 emergent lights is improved after 18 scatterings of site, also scattering can take place behind the light transmission scatter plate 16 of exiting surface 155 outgoing, the illumination uniformity of emergent light is further enhanced; Prismatic lens 17 is used for controlling the rising angle of emergent light, and rising angle diminishes after the light transmission prismatic lens 17, has increased the light intensity on the vertical direction.Used scattering netted dot 18 and scatter plate 16 to improve illumination uniformity in the existing module backlight 10, and 16 pairs of scatterings of light of scattering netted dot 14 and scatter plate and absorption are very serious, have caused optical energy loss, have reduced the efficiency of light energy utilization.In addition, the employing of 10 pairs of scattering netted dots 18 of this module backlight and scatter plate 16 is unfavorable for the integrated demand of module backlight.
Summary of the invention
The purpose of this invention is to provide a kind of submicron grating light guide plate and module backlight, be applied in the existing LCD backlight system, realize evenly illumination, improve the efficiency of light energy utilization of LCD.
Technical scheme of the present invention is as follows:
A kind of submicron grating light guide plate, comprise leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, it is characterized in that: described exiting surface is the face of submicron grating structure, the cycle size of this submicron grating structure is along be the segmentation distribution of successively decreasing away from the incidence surface end, and the submicron grating structure in each section for etc. the cycle grating, the cycle size is a sub-micrometer scale; Described submicron grating structure is to incident light generation diffraction, and diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure.
A kind of submicron grating light guide plate, comprise leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, it is characterized in that: described exiting surface is the face of submicron grating structure, the cycle of this submicron grating structure, the cycle size was a sub-micrometer scale along with being the distribution of successively decreasing continuously away from the incidence surface end; Described submicron grating structure is to incident light generation diffraction, and diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure.
A kind of module backlight, comprise light source, light guide plate and reflecting plate, it is characterized in that: described light guide plate adopts submicron grating light guide plate, this submicron grating light guide plate comprises leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, described exiting surface is the face of submicron grating structure, the cycle size of this submicron grating structure is along be the segmentation distribution of successively decreasing away from the incidence surface end, and the submicron grating structure in each section for etc. the cycle grating, the cycle size is a sub-micrometer scale; Described submicron grating structure is to incident light generation diffraction, and diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure.
A kind of module backlight, comprise light source, light guide plate and reflecting plate, it is characterized in that: described light guide plate adopts submicron grating light guide plate, this submicron grating light guide plate comprises leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, described exiting surface is the face of submicron grating structure, the cycle of this submicron grating structure, the cycle size was a sub-micrometer scale along with being the distribution of successively decreasing continuously away from the incidence surface end; Described submicron grating structure is to incident light generation diffraction, and diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure.
In the technique scheme, the cycle size of described submicron grating structure is decremented to 0.2 μ m from 0.8 μ m.Described leaded light matrix material is a polymethylmethacrylate, and the angle of described incidence surface and lower surface is 45 °～90 °.
Submicron grating light guide plate that the present invention proposes and the module backlight that adopts this submicron grating light guide plate, have the following advantages: the exiting surface of submicron grating light guide plate is the exiting surface that is provided with the submicron grating structure, diffraction can take place when light incides submicron grating structure on the exiting surface, the submicron grating structure makes luminous energy redistribute at exiting surface to the incident diffraction of light, thereby makes that the illuminance of exiting surface outgoing is even.The module backlight of employing submicron grating light guide plate no longer needs the scattering netted dot and the scatter plate of prior art, can realize even illumination, because no scattering loss and absorption loss, the efficiency of light energy utilization is improved.In addition, owing to no longer need scattering netted dot and scatter plate, adopt the module integrated level height backlight of submicron grating light guide plate.
Description of drawings
Fig. 1 is that a kind of module backlight and liquid crystal panel of prior art formed the liquid crystal indicator floor map.
Fig. 2 is the structural representation of submicron grating light guide plate first embodiment of the present invention.
Fig. 3 is the partial schematic diagram of the submicron grating structure on the exiting surface of the described leaded light matrix of first embodiment of the invention.
Fig. 4 is the structural representation of the module backlight of the described employing submicron grating light guide plate of first embodiment of the invention.
Fig. 5 is the structural representation of the module backlight of second embodiment of the invention.
Among the figure: 10-module backlight; The 11-light source; 12-first reflecting plate; 13-second reflecting plate; 14-the 3rd reflecting plate; The 15-light guide plate; 151-leaded light matrix; The 152-incidence surface; The 153-lower surface; The 154-cross section; The 155-exiting surface; The 16-scatter plate; The 17-prismatic lens; The 18-scattering netted dot; The 20-liquid crystal panel; The 21-color filter; The 22-upper polarizer; Polaroid under the 23-; The 30-submicron grating light guide plate; 36-submicron grating structure; 361-first segmentation; 362-second segmentation; 363-the 3rd segmentation.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As Fig. 2, Figure 3 shows that the structural representation of submicron grating light guide plate 30 first embodiment of the present invention.This submicron grating light guide plate 30 comprises leaded light matrix 31, incidence surface 152, lower surface 153, cross section 154 and the exiting surface 155 that connects incidence surface 152 and cross section 154.This exiting surface 155 is faces that a design has submicron grating structure 36, the cycle size of the submicron grating structure 36 on the exiting surface 155 is along be the segmentation distribution of successively decreasing away from incidence surface 152 ends, and the submicron grating structure in each section for etc. the cycle grating, the cycle size is a sub-micrometer scale; As shown in Figure 3, wherein first segmentation 361, second segmentation 362 and the 3rd segmentation 363 separately the submicron grating in the segmentation cycle grating such as be, the cycle size is a sub-micrometer scale.In the present embodiment, the cycle size of described submicron grating structure is decremented to 0.2 μ m from 0.8 μ m; Leaded light matrix 31 materials are polymethylmethacrylate, and the angle of incidence surface and lower surface is 45 °～90 °, and the angle of incidence surface 152 and lower surface 153 is preferably 45 °.
Be illustrated in figure 4 as the structural representation of the module backlight 10 of the described employing submicron grating light guide plate 30 of first embodiment of the invention.The light that light source 11 sends is coupled into leaded light matrix 31 from the incidence surface 152 of leaded light matrix 31, part light is directly into penetrating exiting surface 155, another part light incident lower surface 153, this part light also incident exiting surface 155 upwards after first reflecting plate 12, second reflecting plate 13 and more than 14 reflection of the 3rd reflecting plate.Diffraction can take place when the submicron grating structure 36 on the light incident exiting surface 155.According to the optical grating diffraction principle, during 36 pairs of incident light diffraction of submicron grating structure, its diffraction light comprises the transmission diffraction light of upwards propagating through submicron grating structure 36 and is returned the reflection diffracting light of propagating in the leaded light matrix 31 after 36 reflections of submicron grating structure.The diffraction efficiency of reflection diffracting light is pairing cycle size decision during by light incident submicron grating structure 36.The cycle size of this submicron grating structure is along with being the segmentation distribution of successively decreasing away from the incidence surface end, and the submicron grating structure in each section for etc. the cycle grating, the cycle size is a sub-micrometer scale; The cycle size of described submicron grating structure is decremented to 0.2 μ m from 0.8 μ m; Leaded light matrix 31 materials are polymethylmethacrylate, and the angle of incidence surface and lower surface is 45 °～90 °, and the angle of incidence surface 152 and lower surface 153 is preferably 45 °.The diffraction efficiency of the reflection diffracting light of the submicron grating structure 36 on this exiting surface 155 is along with the trend that tapers off away from incidence surface 152 ends.By control to the diffraction efficiency of zones of different reflection of incident light diffraction light, making that the incident light in the strong zone of illumination has more luminous energy to be reflected back on the exiting surface 155 continues in the leaded light matrix 31 to propagate, and the more weak regional outgoing of illumination from the exiting surface 155, homogenize the luminous energy of exiting surface 155 distribute, realized even illumination.This module backlight no longer needs the scattering netted dot and the scatter plate of prior art, and the integrated level height has reduced the loss that absorption and scattering cause luminous energy, improves the efficiency of light energy utilization of LCD.
Second kind of submicron grating light guide plate provided by the invention, comprise leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, described exiting surface is the face of submicron grating structure, the cycle of this submicron grating structure, the cycle size was a sub-micrometer scale along with being the distribution of successively decreasing continuously away from the incidence surface end; Described submicron grating structure is to incident light generation diffraction, and diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure.
Be illustrated in figure 5 as the synoptic diagram of the structure embodiment of the module backlight 10 that adopts second kind of submicron grating light guide plate.This embodiment is a kind of improvement of first embodiment, and roughly the same with first embodiment on the structure, difference is: the cycle size of this submicron grating structure is along with being the distribution of successively decreasing continuously away from the incidence surface end.Its principle of work is identical with first embodiment.
Claims (4)
1. submicron grating light guide plate, comprise leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, it is characterized in that: described exiting surface is the face of submicron grating structure, the cycle size of this submicron grating structure is along be the segmentation distribution of successively decreasing away from the incidence surface end, and the submicron grating structure in each section for etc. the cycle grating, the cycle size is a sub-micrometer scale, and the cycle size of submicron grating structure is decremented to 0.2 μ m from 0.8 μ m; Described submicron grating structure makes luminous energy redistribute at exiting surface to incident light generation diffraction;
Diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and is returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure; By control to the diffraction efficiency of zones of different reflection of incident light diffraction light, making that the incident light in the strong zone of illumination has more luminous energy to be reflected back on the exiting surface continues in the leaded light matrix to propagate, and the more weak regional outgoing of illumination from the exiting surface, homogenize the luminous energy of exiting surface distribute; Described leaded light matrix material is a polymethylmethacrylate, and the angle of described incidence surface and lower surface is 45 °～90 °.
2. submicron grating light guide plate, comprise leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, it is characterized in that: described exiting surface is the face of submicron grating structure, the cycle of this submicron grating structure is along with being the distribution of successively decreasing continuously away from the incidence surface end, the cycle size is a sub-micrometer scale, and the cycle size of submicron grating structure is decremented to 0.2 μ m from 0.8 μ m; Described submicron grating structure makes luminous energy redistribute at exiting surface to incident light generation diffraction;
Diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and is returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure; By control to the diffraction efficiency of zones of different reflection of incident light diffraction light, making that the incident light in the strong zone of illumination has more luminous energy to be reflected back on the exiting surface continues in the leaded light matrix to propagate, and the more weak regional outgoing of illumination from the exiting surface, homogenize the luminous energy of exiting surface distribute; Described leaded light matrix material is a polymethylmethacrylate, and the angle of described incidence surface and lower surface is 45 °～90 °.
3. module backlight, comprise light source, light guide plate and reflecting plate, it is characterized in that: described light guide plate adopts submicron grating light guide plate, this submicron grating light guide plate comprises leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, described exiting surface is the face of submicron grating structure, the cycle of this submicron grating structure is along with being the distribution of successively decreasing continuously away from the incidence surface end, the cycle size is a sub-micrometer scale, and the cycle size of submicron grating structure is decremented to 0.2 μ m from 0.8 μ m; Described submicron grating structure makes luminous energy redistribute at exiting surface to incident light generation diffraction;
Diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and is returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure; By control to the diffraction efficiency of zones of different reflection of incident light diffraction light, making that the incident light in the strong zone of illumination has more luminous energy to be reflected back on the exiting surface continues in the leaded light matrix to propagate, and the more weak regional outgoing of illumination from the exiting surface, homogenize the luminous energy of exiting surface distribute; Described leaded light matrix material is a polymethylmethacrylate, and the angle of described incidence surface and lower surface is 45 °～90 °.
4. module backlight, comprise light source, light guide plate and reflecting plate, it is characterized in that: described light guide plate adopts submicron grating light guide plate, this submicron grating light guide plate comprises leaded light matrix, incidence surface, lower surface, cross section and the exiting surface that connects incidence surface and cross section, described exiting surface is the face of submicron grating structure, the cycle of this submicron grating structure is along with being the distribution of successively decreasing continuously away from the incidence surface end, the cycle size is a sub-micrometer scale, and the cycle size of submicron grating structure is decremented to 0.2 μ m from 0.8 μ m; Described submicron grating structure makes luminous energy redistribute at exiting surface to incident light generation diffraction;
Diffraction light comprises the transmission diffraction light of upwards propagating through the submicron grating structure and is returned the reflection diffracting light of propagating in the leaded light matrix after the reflection of submicron grating structure; By control to the diffraction efficiency of zones of different reflection of incident light diffraction light, making that the incident light in the strong zone of illumination has more luminous energy to be reflected back on the exiting surface continues in the leaded light matrix to propagate, and the more weak regional outgoing of illumination from the exiting surface, homogenize the luminous energy of exiting surface distribute; Described leaded light matrix material is a polymethylmethacrylate, and the angle of described incidence surface and lower surface is 45 °～90 °.
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| CN2009100862337A CN101566703B (en) | 2009-06-08 | 2009-06-08 | Submicron grating light guide plate and backlight module |
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| CN2009100862337A CN101566703B (en) | 2009-06-08 | 2009-06-08 | Submicron grating light guide plate and backlight module |
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| CN101566703B true CN101566703B (en) | 2011-09-14 |
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| CN106054298B (en) * | 2016-08-23 | 2019-02-26 | 京东方科技集团股份有限公司 | A kind of grating and 3D display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483150A (en) * | 2000-12-28 | 2004-03-17 | ��ʿͨ��ʽ���� | Light guiding plate and liquid crystal display device with the light guiding plate |
| CN1932602A (en) * | 2005-09-14 | 2007-03-21 | 鸿富锦精密工业（深圳）有限公司 | Light-conducting plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483150A (en) * | 2000-12-28 | 2004-03-17 | ��ʿͨ��ʽ���� | Light guiding plate and liquid crystal display device with the light guiding plate |
| CN1932602A (en) * | 2005-09-14 | 2007-03-21 | 鸿富锦精密工业（深圳）有限公司 | Light-conducting plate |
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Granted publication date: 20110914 Termination date: 20180608 |