CN109870752B - Laminated light diffusion plate capable of shortening light mixing distance and eliminating light source bright spots - Google Patents
Laminated light diffusion plate capable of shortening light mixing distance and eliminating light source bright spots Download PDFInfo
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- CN109870752B CN109870752B CN201711259297.3A CN201711259297A CN109870752B CN 109870752 B CN109870752 B CN 109870752B CN 201711259297 A CN201711259297 A CN 201711259297A CN 109870752 B CN109870752 B CN 109870752B
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- 230000003287 optical effect Effects 0.000 claims abstract description 28
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- 239000013078 crystal Substances 0.000 claims description 6
- 239000005340 laminated glass Substances 0.000 abstract description 10
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Abstract
The invention discloses a laminated light diffusion plate capable of shortening a light mixing distance and eliminating light source bright spots, which comprises two pieces of overlapped ultra-white glass, wherein the two pieces of ultra-white glass are fully adhered and fixed by optical cement to form a laminated glass group, the ultra-white glass at one side, close to a light source, in the laminated glass group is light-entering glass, the ultra-white glass at one side, away from the light source is light-emitting glass, and the surfaces of the ultra-white glass at two sides of the optical cement are respectively the light-emitting surface of the light-entering glass and the light-entering surface of the light-emitting glass; the light-in glass, the light-out glass and the light-out glass are respectively printed with a light diffusion ink layer, wherein the light diffusion ink layer is transparent resin ink doped with nanoscale light diffusion particles; wherein the sum of the thicknesses of the light-in glass and the light-out glass is 1-3 mm, the thickness of the light diffusion ink layer is 5-20 mu m, and the thickness of the optical cement is 150-1100 mu m.
Description
Technical Field
The present invention relates to the field of liquid crystal display panels, and more particularly, to a laminated light diffusion plate capable of shortening a light mixing distance and eliminating bright spots of a light source.
Background
The traditional diffusion plate generally adopts PMMA, PC, PS, PP and other base materials and adds inorganic or organic light diffusion agents as scattering particles, so that light is continuously refracted, reflected and scattered in two mediums with different refractive indexes when passing through a scattering layer, the light travelling route is changed, and the effect of fully dispersing the incident light to generate optical diffusion is realized. However, in this way, the absorption of light by the diffusion particles inevitably exists, which results in low light energy utilization rate, and on the other hand, the plastic materials such as PMMA, PC, PS, PP and the like, which have the common properties of moisture absorption expansion, bending under heating and shrinkage under cooling, are used as small-piece expansionThe plate has not changed much, but it is greatly changed and easily aged and yellow when it is used as a large-sized diffusion plate. Especially large-size expansion->When the plate is singly supported and used, the material is too soft, and the supporting force is not enough to easily generate the backward tilting of the front arch.
In order to improve the defects of low light diffusion efficiency and uneven brightness of the light emitting surface of the diffusion plate, the prior art comprises arranging an array arrangement of micro-feature structures, such as a V-shaped groove array, a U-shaped convex groove array, a pyramid array, a circular ring array, a micro-lens array and the like, on the light incident surface of the diffusion plate, and by manually adjusting light rays, the light rays are refracted, reflected and scattered in different directions, the light travelling route is changed, and the effect of fully dispersing the incident light is realized so as to generate optical diffusion. If the microstructure is changed due to the change of the light source, the metal extrusion die of the production line is opened, the cost is huge, the development time is long, and the die opening is difficult to recover once failed. On the other hand, the micro-feature structure of the regular array dots and the net blocks on the diffusion plate can reflect the brightest light rays which are directly emitted at the top of the light source so as to lead the light rays on the light emitting surface to be uniform, but the closer to the boundary shadows between the light source arrays, the more obvious the boundary shadows are, and the limited effect of actually shortening the light mixing distance is achieved.
In view of the current situation of a diffusion plate in a direct type backlight module, it is needed to develop a light diffusion plate with strong supporting force, no warp, high light transmittance, low energy consumption and good light homogenizing effect, and the light mixing distance can be timely adjusted without die opening according to the size change of a backlight source and a liquid crystal panel.
Disclosure of Invention
The invention aims to provide a laminated light diffusion plate which can shorten the light mixing distance and eliminate the bright spots of a light source.
The laminated light diffusion plate comprises two pieces of overlapped ultrawhite glass, wherein the two pieces of ultrawhite glass are bonded and fixed by optical cement to form a laminated glass group, the ultrawhite glass at one side, close to a light source, in the laminated glass group is light-entering glass, the ultrawhite glass at one side, away from the light source is light-emitting glass, and the surfaces of the ultrawhite glass at two sides of the optical cement are respectively the light-emitting surface of the light-entering glass and the light-entering surface of the light-emitting glass; the light-in glass, the light-out glass and the light-out glass are respectively printed with a light diffusion ink layer, wherein the light diffusion ink layer is transparent resin ink doped with nanoscale light diffusion particles; wherein the sum of the thicknesses of the light-in glass and the light-out glass is 1-3 mm, the thickness of the light diffusion ink layer is 5-20 mu m, and the thickness of the optical cement is 150-1100 mu m.
Further, the light incident surface of the light incident glass, the light emergent surface of the light incident glass, the light incident surface of the light emergent glass and the light emergent surface of the light emergent glass are all uneven and transparent irregular micro-nano light bead diffuse reflection surfaces. On the basis that light is diffused through the light diffusion ink aperture, the light is further expanded through the irregular micro-nano light bead diffuse reflection surface, the aperture is increased layer by layer between media with different transmittances, and the light mixing distance can be further shortened.
Further, a light diffusion ink layer is printed on the light incident surface of the light emergent glass.
Further, the optical cement is a solid ultraviolet flexible cement.
Further, the light diffusion ink layer is transparent resin ink doped with nano light diffusion particles and quantum dot crystals.
Further, the sum of the thicknesses of the light incident glass and the light emergent glass is 2+/-0.1 mm, and the thickness of the light diffusion ink layer is 1.1+/-0.1 mm.
Further, the laminated light diffusion plate comprises a plurality of pieces of super-white glass which are laminated and attached, the light incident surface and the light emergent surface of each piece of super-white glass are uneven and transparent irregular micro-nano light bead diffuse reflection surfaces and are printed with light diffusion ink layers, and the sum of the thicknesses of the super-white glass is based on a glow point which can cover a light source. When the light source is used as a lighting panel, the quantity of the ultra-white glass is correspondingly increased along with the increase of the power of the light source, so that the light mixing distance of the high-power lighting lamp is shortened and the light source bright point is eliminated.
Further, the ultrawhite glass is chemically strengthened ultrawhite glass.
The diffusion plate is made of the ultra-white glass with high light transmittance (the light transmittance is more than 91.5%), the hardness of the diffusion plate is 36 times higher than that of the plastic diffusion plate, the thermal expansion rate is reduced by 90% compared with that of the plastic diffusion plate, the wet expansion is zero, the diffusion plate is not easy to deform compared with the traditional plastic diffusion plate, the diffusion plate can be arranged close to a liquid crystal panel by being used as a part of a direct type backlight module, and only an air gap of 1-2 mm is reserved between the diffusion plate and the diffusion plate, so that the brightness is improved, the thickness of a large-size direct type backlight liquid crystal display module is further thinned, the weight of the direct type backlight liquid crystal display module is reduced, and the direct type backlight liquid crystal display module cannot age and yellow due to heating; the laminated glass group formed by two pieces of ultra-white glass is provided with a plurality of high-transmittance smooth medium layers with different refractive indexes, so that light rays are refracted, reflected and scattered layer by layer after entering a light entering surface, the aperture diameter is enlarged layer by layer to weaken the bright point of an LED lamp source, and meanwhile, a novel multilayer optical diffusion structure reduces the distance between the light entering surface of a diffusion plate and the reflecting surface of the LED lamp source, and the light mixing distance can be directly reduced from 30mm to below 20mm by taking an 86-inch direct type backlight module as an example. The light-emitting device is simple in structure, easy to process and manufacture, and capable of saving energy and improving brightness and light-emitting uniformity of the light-emitting surface.
Drawings
Fig. 1 is a schematic diagram illustrating an assembly structure of a laminated light diffusion plate according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the combined structure of FIG. 1;
FIG. 3 is a schematic view of a laminated light diffusion plate according to embodiment 2 of the present invention;
FIG. 4 is a schematic view of an incident glass structure of a laminated light diffusion plate according to embodiment 3 of the present invention;
FIG. 5 is a photograph of an irregular micro-nano bead structure with an uneven and transparent light incident surface of the light incident glass according to the embodiment 3 of the present invention after five hundred times magnification;
FIG. 6 is a schematic diagram of the structure of FIG. 5;
FIG. 7 is a schematic view showing light diffusion when the light mixing distance is 15mm in example 3 of the present invention, wherein the thick arrow "≡" represents the light incident direction, and the thin arrowRepresents the light refraction path, and D represents the aperture range reached by the light after passing through the acrylic diffusion plate;
FIG. 8 is a graph showing light diffusion at a light mixing distance of 30mm for the comparative example, wherein D' represents the aperture range reached by light passing through an acrylic diffuser plate.
Detailed Description
Preferred embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and fig. 2, a laminated light diffusion plate capable of shortening a light mixing distance and eliminating light source bright spots comprises two overlapped pieces of ultra-white glass (11, 12), wherein the two pieces of ultra-white glass (11, 12) are adhered and fixed on the whole surface of an adhesive surface by a solid ultraviolet flexible adhesive 2 to form an adhesive-coated glass group 1, the ultra-white glass 11 at one side, close to a light source 100, in the adhesive-coated glass group 1 is light-in glass, the ultra-white glass 12 at one side, away from the light source is light-out glass, and the surfaces of the ultra-white glass at two sides of the solid ultraviolet flexible adhesive 2 are light-out surfaces 112 of the light-in glass and light-in surfaces 121 of the light-out glass respectively; a light diffusion ink layer 3 is printed on the light incident surface 111 of the light incident glass, the light emergent surface 112 of the light incident glass and the light emergent surface 122 of the light emergent glass respectively; wherein the sum of the thicknesses of the light incident glass 11 and the light emergent glass 12 is 2mm, the thickness of the light diffusion ink layer is 10 mu m, and the thickness of the solid ultraviolet flexible glue is 180 mu m.
Example 2
As shown in fig. 3, unlike in example 1, a light diffusion ink layer 3 is printed on the light incident surface 111 of the light incident glass 11, the light emergent surface 112 of the light incident glass 11, the light incident surface 121 of the light emergent glass 12 and the light emergent surface 122 of the light emergent glass 12, respectively, the thickness of the light diffusion ink layer is 10 μm, and the thickness of the solid ultraviolet flexible glue is 180 μm.
Example 3
As shown in fig. 4 to 6, unlike in example 2, the light incident surface 111 and the light emergent surface 112 of the light incident glass 11, the light incident surface 121 and the light emergent surface 122 of the light emergent glass 12 are all uneven and transparent irregular micro-nano light bead diffuse reflection surfaces, the thickness of the light diffusion ink layer is 10 μm, and the thickness of the optical cement is 180 μm. The irregular micro-nano light bead diffuse reflection surface with the uneven and transparent surface is formed by carrying out transparent uneven micro-nano optical etching on the surface of ultra-white glass.
The light diffusion ink layer in the light diffusion plate structure of the embodiment of the invention is transparent resin ink doped with nano light diffusion particles and Quantum dot crystals, and nano Quantum Dots (Quantum Dots for short)QD) crystals emit very pure colored light when stimulated by light from a blue LED backlight, realizing full-color display, and truly reproducing the color of the image, so that the image of the liquid crystal display is more gorgeous. The nanoscale light diffusion particles are larger nano particles, so that light rays are continuously refracted, reflected and scattered in two media with different refractive indexes when passing through the scattering layer, and the effect of optical diffusion is generated; quantum dot crystals are smaller inorganic nanocrystals, but both possess photo-expansionThe mixed ink with the large and small particles mixed and stirred together and the quantum dot light diffusion ink layer printed on the surface of the glass by using a screen printing technology, besides exhibiting the high color gamut and the bright color, the uniformity of light diffusion is finer.
Comparative example
The comparative example is a single-layer acrylic diffuser plate 200 with a light incident surface having a micro-feature structure of a regular array type net block. The light diffusion diagram is shown in fig. 8.
The light diffusion plates of examples 1 to 3 and comparative example were respectively disposed above the LED light sources, the thicknesses of the light diffusion plates were all 2mm, the initial light mixing distances were respectively set to 30mm, and further shortened to 24.5mm and 20mm, and the brightness and the light shielding performance of each light diffusion plate were tested, and the results are shown in table 1:
TABLE 1
As can be seen from Table 1, under the same conventional thickness, the brightness values of examples 1-2 are higher than those of the acrylic plate along with the shortening of the light mixing distance, the light diffusion efficiency is high, and examples 1-3 can shorten the light mixing distance from 30mm to 20mm, so that the brightness of the light-emitting surface is higher, no obvious bright point exists on the light-emitting surface, and the brightness is uniform.
As shown in fig. 7, the light passes through the laminated glass light diffusion plate, the uneven and transparent irregular micro-nano light bead diffuse reflection surface is added, the diffusion ink diffusion layer is added, the multi-layer diffusion is amplified, the mixed light distance between the light diffusion plate and the light source is reduced to 15mm, and meanwhile, the aperture distance D similar to the aperture width distance D' formed by the original single-layer acrylic light diffusion plate at the mixed light distance of 30mm can be still achieved.
Example 4
Example 4 has the same structure as example 1 except that the sum of the thicknesses of the light incident glass 11 and the light emergent glass 12 is 1mm, the thickness of the light diffusion ink layer is 5 μm, and the thickness of the solid ultraviolet flexible glue is 150 μm.
Example 5
Example 5 has the same structure as example 1 except that the sum of the thicknesses of the light incident glass 11 and the light emergent glass 12 is 3mm, the thickness of the light diffusion ink layer is 20 μm, and the thickness of the solid ultraviolet flexible glue is 300 μm.
Example 6
Example 6 has the same structure as example 1, except that the sum of the thicknesses of the light incident glass 11 and the light emergent glass 12 is 2.1mm, the thickness of the light diffusion ink layer is 15 μm, and the thickness of the solid ultraviolet flexible glue is 200 μm.
Example 7
Example 7 has the same structure as example 2 except that the sum of the thicknesses of the light incident glass 11 and the light emergent glass 12 is 2.3mm, the thickness of the light diffusion ink layer is 15 μm, and the thickness of the solid ultraviolet flexible glue is 200 μm.
The thickness of the light diffusion ink is not limited to that of the embodiment, and the thickness of the light diffusion ink is printed according to the power of a light source in actual production, generally, the thickness of the light diffusion ink is correspondingly increased when the power is higher, so that luminous flux is ensured, and light loss is reduced; the composition of the light diffusion ink is not limited to the embodiment, but can be a transparent resin ink doped with nano light diffusion particles, but the quantum dot crystal can show a high color gamut and a bright color; under the requirement of thinning the total thickness of the backlight module, the thickness is preferably 5-20 mu m; the thickness range of the optical adhesive is 150-1100 mu m, the types of the optical adhesive are different, the thickness is correspondingly adjusted, the transmittance of light is ensured, meanwhile, the glass is ensured not to warp, when the optical adhesive is solid ultraviolet flexible adhesive, the thickness range is 150-300 mu m, when the optical adhesive is liquid uv adhesive, the transmittance of light is influenced when the thickness of the optical adhesive exceeds 300 mu m, and when the thickness of the optical adhesive is smaller than 150 mu m, the formed laminated glass group is too thin and easy to warp; the total thickness of the ultra-white glass is 1.4-3 mm, wherein the thickness is preferably 2mm, the light mixing distance can be shortened to 20mm, the light is uniform, and the light is bright; the optical adhesive adopted by the invention is not limited to the solid ultraviolet flexible adhesive in the embodiment, and can be liquid uv adhesive, OCA optical adhesive and the like, wherein the attaching yield of the solid ultraviolet flexible adhesive is higher; the number of the ultra-white glass is not limited to the embodiment, and the ultra-white glass can be three, the three ultra-white glass is fully adhered and fixed by optical cement to form a laminated glass group, light diffusion ink layers are respectively printed on the light inlet surface and the light outlet surface of the laminated glass group, at least two sides of the laminated glass are printed with the light diffusion ink layers, and the sum of the thicknesses of the three ultra-white glass is based on the bright point capable of covering the LED light source; the ultra-white glass can also be chemically strengthened ultra-white glass so as to improve the strength of the ultra-white glass.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent processes or direct or indirect applications in other related technical fields using the content of the present invention are included in the scope of the present invention.
Claims (8)
1. A laminated light diffusion plate capable of shortening light mixing distance and eliminating light source bright spots is characterized in that: the optical adhesive comprises two overlapped ultra-white glass sheets, wherein the two ultra-white glass sheets are bonded and fixed by optical adhesive to form an adhesive-coated glass group, the ultra-white glass on one side, close to a light source, in the adhesive-coated glass group is light-entering glass, the ultra-white glass on one side, away from the light source, is light-emitting glass, and the surfaces of the ultra-white glass on two sides of the optical adhesive are respectively the light-emitting surface of the light-entering glass and the light-entering surface of the light-emitting glass; the light-in glass, the light-out glass and the light-out glass are respectively printed with a light diffusion ink layer, wherein the light diffusion ink layer is transparent resin ink doped with nanoscale light diffusion particles; wherein the sum of the thicknesses of the light-in glass and the light-out glass is 1-3 mm, the thickness of the light diffusion ink layer is 5-20 mu m, and the thickness of the optical cement is 150-1100 mu m.
2. The laminated light diffusion plate capable of shortening a light mixing distance and eliminating a bright spot of a light source according to claim 1, wherein: the light incident surface of the light incident glass, the light emergent surface of the light incident glass, the light incident surface of the light emergent glass and the light emergent surface of the light emergent glass are all uneven and transparent irregular micro-nano light bead diffuse reflection surfaces.
3. The laminated light diffusion plate capable of shortening a light mixing distance and eliminating a bright point of a light source according to claim 1 or 2, wherein: and a light diffusion ink layer is printed on the light incident surface of the light emergent glass.
4. The laminated light diffusion plate capable of shortening a light mixing distance and eliminating a bright point of a light source according to claim 1 or 2, wherein: the optical adhesive is solid ultraviolet flexible adhesive, and the thickness of the optical adhesive is 150-300 mu m.
5. The laminated light diffusion plate capable of shortening a light mixing distance and eliminating a bright point of a light source according to claim 1 or 2, wherein: the light diffusion ink layer is transparent resin ink doped with nanoscale light diffusion particles and quantum dot crystals.
6. The laminated light diffusion plate capable of shortening a light mixing distance and eliminating a bright point of a light source according to claim 1 or 2, wherein: the sum of the thicknesses of the light incident glass and the light emergent glass is 2+/-0.1 mm, and the thickness of the light diffusion ink layer is 1.1+/-0.1 mm.
7. The laminated light diffusion plate capable of shortening a light mixing distance and eliminating a bright point of a light source according to claim 1 or 2, wherein: the laminated light diffusion plate comprises a plurality of pieces of laminated and laminated ultrawhite glass, the light incident surface and the light emergent surface of each piece of ultrawhite glass are uneven and transparent irregular micro-nano light bead diffuse reflection surfaces and are printed with light diffusion ink layers, and the sum of the thicknesses of the pieces of ultrawhite glass is based on a bright point capable of covering a light source.
8. The laminated light diffusion plate capable of shortening a light mixing distance and eliminating a bright point of a light source according to claim 1 or 2, wherein: the ultra-white glass is chemically strengthened ultra-white glass.
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| CN201711259297.3A CN109870752B (en) | 2017-12-04 | 2017-12-04 | Laminated light diffusion plate capable of shortening light mixing distance and eliminating light source bright spots |
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| CN201711259297.3A CN109870752B (en) | 2017-12-04 | 2017-12-04 | Laminated light diffusion plate capable of shortening light mixing distance and eliminating light source bright spots |
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| CN112859219A (en) * | 2021-03-11 | 2021-05-28 | 绵阳捷智科技股份有限公司 | Preparation method of quantum dot diffusion plate |
| CN114740650B (en) * | 2022-04-20 | 2024-01-12 | 广州思而特科技有限公司 | Glass diffusion plate, manufacturing method of glass quantum dot diffusion plate and diffusion ink |
| CN115016172A (en) * | 2022-05-19 | 2022-09-06 | 盈天实业(深圳)有限公司 | Glass backlight plate, preparation method thereof, backlight module and display device |
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| JP2010073451A (en) * | 2008-09-18 | 2010-04-02 | Oji Paper Co Ltd | Light diffusing body for backlight unit, and backlight unit |
| JP2010165547A (en) * | 2009-01-15 | 2010-07-29 | Oji Paper Co Ltd | Surface light source device |
| CN104508517A (en) * | 2012-07-27 | 2015-04-08 | 日本瑞翁株式会社 | Optical sheet and surface light source apparatus |
| CN204666842U (en) * | 2015-03-13 | 2015-09-23 | 宁波众鼎塑料有限公司 | A kind of PC diffuser plate |
| CN105700063A (en) * | 2016-04-12 | 2016-06-22 | 东莞轩朗实业有限公司 | Glass light guide plate |
| CN207488525U (en) * | 2017-12-04 | 2018-06-12 | 欧浦登（顺昌）光学有限公司 | A kind of stacked light diffusing sheet for shortening light mixing distance and eliminating light source bright spot |
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2017
- 2017-12-04 CN CN201711259297.3A patent/CN109870752B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010073451A (en) * | 2008-09-18 | 2010-04-02 | Oji Paper Co Ltd | Light diffusing body for backlight unit, and backlight unit |
| JP2010165547A (en) * | 2009-01-15 | 2010-07-29 | Oji Paper Co Ltd | Surface light source device |
| CN104508517A (en) * | 2012-07-27 | 2015-04-08 | 日本瑞翁株式会社 | Optical sheet and surface light source apparatus |
| CN204666842U (en) * | 2015-03-13 | 2015-09-23 | 宁波众鼎塑料有限公司 | A kind of PC diffuser plate |
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