CN108897091B - Compound straight following formula backlight unit - Google Patents
Compound straight following formula backlight unit Download PDFInfo
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- CN108897091B CN108897091B CN201810531011.0A CN201810531011A CN108897091B CN 108897091 B CN108897091 B CN 108897091B CN 201810531011 A CN201810531011 A CN 201810531011A CN 108897091 B CN108897091 B CN 108897091B
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- light guide
- light
- layer
- backlight module
- diffusion plate
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0073—Light emitting diode [LED]
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a composite direct type backlight module, which comprises: a direct type backlight module; one or more groups of side-in backlight module modules arranged on the side surface of the direct type backlight module; the direct type backlight module comprises: the light guide diffusion plate comprises a milky diffusion layer arranged on the upper half part of the light guide diffusion plate and a transparent light guide layer arranged on the lower half part of the light guide diffusion plate; the back plate is arranged below the light guide diffusion plate and used for installing the light guide diffusion plate and the side-in type backlight module; and the direct type LED lamp strip and the reflecting sheet are arranged on the back plate and face one surface of the light guide diffusion plate, so that the advantages of uniform image quality, high brightness and space saving of an ultrathin direct type product are achieved, the process is simplified, the development period is shortened, and meanwhile, the production cost is reduced.
Description
Technical Field
The invention relates to the field of direct type backlight, in particular to a composite direct type backlight module.
Background
The development trend of the direct-type backlight module is ultra-thin and high-brightness. As shown in fig. 1, a conventional ultra-thin direct type backlight module includes: a diffuser plate, a diaphragm 12, a reflective sheet 10, a lens 13, etc. Although the existing direct type backlight module can realize a thinner model, the model is thinner and thinner, the edge is more and more inward due to the limitation of cost, design space and lens technology, namely, the light mixing distance and the edge angle are smaller, so that the bottom surface area is smaller, the number of LEDs of the direct type backlight module is smaller and smaller, meanwhile, the light from the LEDs to the corners is lengthened, high-brightness indexes are realized on the direct type backlight module, only high-cost optical diaphragms such as prism sheets, DBEF and the like are relied on, on one hand, the diaphragm has a limited effect of improving the brightness and can not reach the standard of fixed grade, on the other hand, the light mixing effect of the optical lenses is partially failed along with the reduction of the light mixing distance and the number of the LEDs, the LED interval is increased, the optical lens can show non-uniform failure and serious dark angle, and therefore, the existing direct type backlight module has poor visual effect, low brightness, The defects of high cost and unstable quality require a better direct type backlight design scheme.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The present invention is directed to solve the above-mentioned problems of the prior art, and an embodiment of the present invention provides a composite direct-type backlight module, which has the advantages of uniform image quality, high brightness, low cost, and saving a large amount of space.
The technical scheme adopted by the invention for solving the technical problem is as follows: a kind of compound straight-down type backlight module, including: a direct type backlight module; one or more groups of side-in backlight module modules arranged on the side surface of the direct type backlight module; the direct type backlight module comprises: the light guide diffusion plate comprises a milky diffusion layer arranged on the upper half part of the light guide diffusion plate and a transparent light guide layer arranged on the lower half part of the light guide diffusion plate; the back plate is arranged below the light guide diffusion plate and used for installing the light guide diffusion plate and the side-in type backlight module; and the direct type LED lamp strip and the reflecting sheet are arranged on the back plate and face one surface of the light guide diffusion plate.
Furthermore, the side-in type backlight module comprises a side-in type LED lamp bar arranged on the side surface of the light guide diffusion plate and a cushion block arranged on the side-in type LED lamp bar.
Furthermore, the cushion block is in contact with the light incident surface of the light guide layer, and the light emitting surface of the side-entering type LED light bar faces to the light incident side end surface of the lower half part of the light guide diffusion plate.
Furthermore, the height of the cushion block is 0.2-0.5 mm higher than that of the LED.
Further, the upper surface of the diffusion layer is a rough structure surface, the lower surface of the light guide layer is a mesh point surface, hemispherical convex mesh points are arranged on the mesh point surface, and the diffusion layer is bonded with the light guide layer through a photosensitive UV adhesive layer.
Furthermore, the light incident surface of the light guide layer is opposite to the side-in type LED lamp strip, the light incident surface is set to be single-sided, double-sided or four-side incident light according to the brightness, and shading adhesive tapes are attached to other end faces of the light guide layer except the light incident surface.
Furthermore, two ends of the upper end face of the back plate extend upwards to form a folded edge perpendicular to the upper end face of the back plate and used for the side-in type LED light bar, and the light guide and diffusion plate is arranged on the top platform of the back plate and forms a cavity with the back plate.
Furthermore, a reflector plate is arranged on one surface of the back plate, which is close to the light guide diffusion plate; the bottom surface of the cavity is provided with a support column used for bearing the light guide diffusion plate, the support column is in an inverted T shape, and the column body is in a conical shape and is in contact with the mesh point surface of the light guide layer.
The utility model provides a light guide diffusion plate, light guide diffusion plate is including locating the milky diffusion layer that is of light guide diffusion plate first and locating light guide diffusion plate lower half is transparent leaded light layer, the diffusion layer with the leaded light layer passes through sensitization UV glue film and bonds.
Furthermore, the upper surface of the diffusion layer is a rough structure surface, the lower surface of the light guide layer is a mesh point surface, and convex hemispherical convex mesh points are arranged on the mesh point surface.
In summary, the composite direct type backlight module provided by the present invention has the following beneficial effects: except the general framework of the straight down type backlight module, the straight down type backlight module is compatible with the side-in type backlight module, the energy of the straight down type backlight module and the energy of the straight down type backlight module are overlapped, the ultra-high brightness index can be easily realized on the premise of not using a membrane and a lens, the lattice points on the lower surface of the light guide diffusion plate are matched with the structural surface of the upper surface, the point light sources of the LED can be converted into uniform surface light sources to be emitted, and the uniform image quality is realized.
Drawings
FIG. 1 is a schematic diagram of a conventional ultra-thin direct-type backlight module;
FIG. 2 is a schematic cross-sectional view of a composite direct-type backlight module according to the present invention;
FIG. 3 is a schematic cross-sectional view of the light guiding and diffusing plate of FIG. 2;
FIG. 4 is a schematic diagram of the light guiding diffuser plate of FIG. 3;
FIG. 5 is a schematic view showing the distribution of dots in a single-sided incident light guide layer;
FIG. 6 is a schematic view of the distribution of dots on a light guide layer with light incident on two or four sides.
Reference numerals
1. A back plate; 2. a light guide diffusion plate; 21. a diffusion layer; 22. a light guide layer; 3. a direct type LED lamp strip; 4. a side-in LED light bar; 5. a rough structural surface; 6. a mesh point surface; 7. convex net points; 8. a support pillar; 9. a UV adhesive layer; 10. a reflective sheet; 11. folding edges; 12. a membrane; 13. a lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 2 and 3, a composite direct-type backlight module includes a direct-type backlight module and one or more sets of lateral backlight module modules disposed on the lateral surface of the direct-type backlight module.
The direct type backlight module comprises a light guide diffusion plate 2, a back plate 1 arranged below the light guide diffusion plate 2, a direct type LED lamp strip 3 and a reflector plate 10, wherein the light guide diffusion plate 2 and the side type backlight module are arranged on the back plate 1, and the direct type LED lamp strip 3 and the reflector plate 10 are arranged on one surface of the back plate 1 facing the light guide diffusion plate 2; the light guide diffuser 2 is made of polystyrene, and the light guide diffuser 2 includes a milky diffuser layer 21 disposed on the upper half of the light guide diffuser 2 and a transparent light guide layer 22 disposed on the lower half of the light guide diffuser 2.
With reference to fig. 4, light from the direct type LED light bar 3 is incident to the light guide layer 22, a part of the light energy is reflected by the light guide layer 22 and returns to the light mixing cavity, and a part of the light energy passes through the light guide layer 22 and is finally emitted by diffusion of the diffusion layer 21 to form uniform light energy distribution; the light energy returning to the light mixing cavity is transmitted upwards again under the reflection action of the reflector plate 10, and the processes are circulated; because the refractive index of PS (polystyrene) is far greater than that of air, the light energy of the side-entry backlight module can be totally reflected after entering the light guide layer 22, the bottom surface of the light guide layer 22 can destroy the total reflection, so that the light energy enters the diffusion layer 21, and then the light energy is uniformly distributed through the refraction and scattering effects of the diffusion layer 21; the light energy of the direct type LED light bar 3 and the light energy of the side type backlight module are finally superposed on the diffusion layer 21 to form emergent light energy together.
The light guide layer 22 is made of pure polystyrene, and the diffusion layer 21 is uniformly doped with a diffusing agent component, so that the diffusion layer 21 has strong light diffusion.
The lateral-in type backlight module comprises a lateral-in type LED lamp strip 4 arranged on the side face of the light guide diffusion plate 2 and a cushion block arranged on the lateral-in type LED lamp strip 4, the light incoming face of the light guide layer 22 is just opposite to the lateral-in type LED lamp strip 4, the light incoming face can be set to be single-sided, double-sided or four-side incoming light according to the brightness, and other end faces of the light guide layer 22 except the light incoming face are attached with shading adhesive tapes, so that the purpose of improving the brightness by light leakage can be.
The cushion contacts in the income plain noodles of leaded light layer 22, and the light emitting area of side income formula LED lamp strip 4 is just to the income plain noodles side end face of leaded light diffuser plate 2 lower half to reach the purpose that prevents the light leak, further improved luminance.
Two ends of the upper end face of the back plate 1 extend upwards to form a folded edge 11 which is perpendicular to the upper end face of the back plate 1 and used for installing the side-in type LED light bar 4, and the light guide and diffusion plate 2 is fixed on the top platform of the back plate 1 and forms a cavity with the back plate 1.
The bottom surface of the cavity is provided with a supporting column 8 for bearing the light guide diffusion plate 2, the supporting column 8 is in an inverted T shape, and the column body is conical and is in contact with the mesh point surface 6 of the light guide layer 22, so that the stability between the light guide diffusion plate 2 and the back plate 1 is enhanced on one hand, and the interference to light reflection is reduced on the other hand.
Further, the height of the cushion block is 0.2-0.5 mm higher than that of the LED, the common thickness of the light guide diffusion plate 2 is 2mm, 1.8mm, 1.5mm, 1.2mm, 1mm and 0.8mm, but not limited to these thicknesses, for the consideration of reliability, the thickness of 1.8mm or 2mm is adopted over 58 inches (including 58 inches), the thickness of 1.2mm or 1.5mm is adopted over 43 inches-55 inches, and the thickness of 1mm is adopted over 32 inches-43 inches, generally, the thickness of the light guide layer 22 (including the convex mesh point 7) is equal to that of the diffusion layer 21, the adjustment can be flexibly made according to the actual situation, if the visual effect is uniform, the brightness needs to be increased, the diffusion layer 21 can be properly thinned and the light guide layer 22 can be thickened; if the brightness is sufficient to improve the visual effect, the light guiding layer 22 can be thinned appropriately to increase the thickness of the diffusion layer 21.
As shown in fig. 5, the graph is a schematic diagram of the distribution of the convex dots 7 of the light guide layer 22 with light entering from one side, the horizontal axis represents the relative position of the convex dots 7, the vertical axis represents the diameter of the convex dots 7, the initial convex dot 7 on the light entering side is taken as the origin, and the diameter of the convex dot 7 parallel to the incident light direction is plotted to obtain a gaussian-like smooth curve as shown in the figure, in order to obtain the optimal optical distribution, the diameter distribution of the convex dots 7 should satisfy the functional equation: phi = A X B + C, wherein X is the coordinate of the convex screen point 7, C is the diameter of the minimum convex screen point 7, A, B is a curve design parameter, the convex screen point 7 of the light guide layer 22 is formed by a mold in one step, C can take a value to about 0.1mm in the minimum, and in order to balance the energy distribution of the light incident side and the light emergent side of the light guide layer 22 and maximize the central brightness, the distribution curve of the convex screen point 7 of the light emergent side is locally finely adjusted and pulled down to form a 'spoon tail'.
As shown in fig. 6, the distribution of the convex dots 7 of the light guide layer 22 with light incident on two sides or four sides is schematically shown, the convex dots 7 with light incident on one side are used as the original points, and the diameters of the convex dots 7 parallel to the light incident direction are plotted to obtain the symmetrical smooth curve shown in fig. 5, where the single-sided curve should satisfy the function equation Φ = a × X ^ B + C, and the middle portion needs to be locally fine-tuned to ensure smooth transition.
In summary, light of the direct type LED light bar 3 is incident to the area of the convex mesh 7 of the light guide layer 22, part of the light energy returns to the light mixing cavity through the reflection of the convex mesh 7, part of the light energy passes through the light guide layer 22 and is finally emitted through the diffusion of the diffusion layer 21 to form uniform light energy distribution, the light energy returning to the light mixing cavity is transmitted upward again through the reflection of the reflector 10, and the above processes are repeated; the light energy of the side-in type LED lamp strip 4 can be totally reflected originally after entering the light guide layer 22, the bottom surface convex dots 7 can destroy the total reflection, so that the light energy enters the diffusion layer 21, and then the light energy is uniformly distributed through the refraction and scattering effects of the diffusion layer 21.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a compound straight following formula backlight unit which characterized in that includes:
a direct type backlight module;
one or more groups of side-in backlight module modules arranged on the side surface of the direct type backlight module;
the direct type backlight module comprises:
the light guide diffusion plate comprises a milky diffusion layer arranged on the upper half part of the light guide diffusion plate and a transparent light guide layer arranged on the lower half part of the light guide diffusion plate;
the back plate is arranged below the light guide diffusion plate and used for installing the light guide diffusion plate and the side-in type backlight module; and the number of the first and second groups,
the direct type LED lamp strip and the reflector plate are arranged on one surface of the back plate, which faces to one surface of the light guide diffusion plate;
the upper surface of the diffusion layer is a rough structure surface, the lower surface of the light guide layer is a mesh point surface, and hemispherical convex mesh points are arranged on the mesh point surface; the mesh surface is used for destroying the total reflection effect of light rays in the light guide layer, enabling the light rays to enter the diffusion layer, and has a refraction effect on the light rays of the direct-type LED light bar so as to scatter regularly distributed light energy;
wherein, the diameter distribution of the convex net points satisfies a function equation: phi is A X X B + C, wherein X is the coordinate of the convex screen point, C is the minimum convex screen point diameter, and A, B is a curve design parameter;
the side-in type backlight module comprises a side-in type LED lamp bar arranged on the side surface of the light guide diffusion plate and a cushion block arranged on the side-in type LED lamp bar;
the cushion block is contacted with the light incident surface of the light guide layer, and the light emitting surface of the side-entering LED light bar is right opposite to the light incident side end surface of the lower half part of the light guide diffusion plate;
the mesh surface has a refraction effect on the lateral-entering LED lamp strip so as to regularly scatter light energy;
the diffusion layer is bonded with the light guide layer through a photosensitive UV adhesive layer;
the light guide layer is characterized in that the light incident surface of the light guide layer is opposite to the side-entering LED light bar, the light incident surface is set to be incident light on one side, two sides or four sides according to the brightness, and shading adhesive tapes are attached to other end faces of the light guide layer except the light incident surface.
2. The direct type backlight module as claimed in claim 1, wherein the height of the spacers is 0.2-0.5 mm higher than that of the LEDs.
3. The backlight module of claim 1, wherein two ends of the upper surface of the back plate extend upward to form a flange perpendicular to the upper surface of the back plate for the side-in type LED light bar to be mounted thereon, and the light guiding and diffusing plate is disposed on the top platform of the back plate and forms a cavity with the back plate.
4. A compound direct type backlight module as claimed in claim 3, wherein the bottom surface of the cavity is provided with support pillars for supporting the light guiding and diffusing plate, the support pillars are inverted "T" shaped, and the pillars are tapered and contact with the dot surface of the light guiding layer.
5. A light guide diffusion plate is characterized by comprising a milky diffusion layer arranged on the upper half part of the light guide diffusion plate and a transparent light guide layer arranged on the lower half part of the light guide diffusion plate, wherein the diffusion layer is bonded with the light guide layer through a photosensitive UV adhesive layer; the upper surface of the diffusion layer is a rough structure surface, the lower surface of the light guide layer is a mesh point surface, and hemispherical convex mesh points are arranged on the mesh point surface; the mesh surface is used for destroying the total reflection effect of light rays in the light guide layer, enabling the light rays to enter the diffusion layer, and has a refraction effect on the light rays of the direct-type LED light bar so as to scatter regularly distributed light energy; the mesh surface has a refraction effect on the lateral-entering LED lamp strip so as to regularly scatter light energy;
wherein, the diameter distribution of the convex net points satisfies a function equation: phi is A X X B + C, wherein X is the coordinate of the convex screen point, C is the minimum convex screen point diameter, and A, B is a curve design parameter;
the light guide layer is arranged on the side-in type LED lamp strip, the light guide layer is arranged on the side-in type LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810531011.0A CN108897091B (en) | 2018-05-29 | 2018-05-29 | Compound straight following formula backlight unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810531011.0A CN108897091B (en) | 2018-05-29 | 2018-05-29 | Compound straight following formula backlight unit |
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| CN108897091A CN108897091A (en) | 2018-11-27 |
| CN108897091B true CN108897091B (en) | 2021-06-01 |
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| CN201810531011.0A Active CN108897091B (en) | 2018-05-29 | 2018-05-29 | Compound straight following formula backlight unit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609418A (en) * | 2019-09-24 | 2019-12-24 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
| CN110764168A (en) * | 2019-10-18 | 2020-02-07 | 深圳创维－Rgb电子有限公司 | Optical lens structure, backlight module and lens forming method |
| CN114647116B (en) * | 2022-04-26 | 2023-07-07 | 深圳创维－Rgb电子有限公司 | Diffusion plate structure and display device |
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| CN202522726U (en) * | 2012-03-07 | 2012-11-07 | 昆山翰辉电子科技有限公司 | Light guide plate possessing light diffusion function |
| CN107422531A (en) * | 2017-08-14 | 2017-12-01 | 深圳创维－Rgb电子有限公司 | Mix incident type backlight module and liquid crystal display device |
| CN107526217A (en) * | 2017-10-19 | 2017-12-29 | 京东方科技集团股份有限公司 | Side entrance back module and display device |
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| CN101630028A (en) * | 2008-07-16 | 2010-01-20 | 颖台科技股份有限公司 | Compound type diffusion plate structure, backlight module and liquid crystal display |
| KR101360893B1 (en) * | 2010-11-25 | 2014-02-19 | 케이에스씨비 주식회사 | Light Diffusive Ink Composition And Light Guide Panel Unit Using The Same |
| CN102679271A (en) * | 2012-05-17 | 2012-09-19 | 昆山市诚泰电气股份有限公司 | Light guide diffusion plate and LED (light-emitting diode) plane light source |
| CN203215568U (en) * | 2013-04-15 | 2013-09-25 | 深圳市宝得利光电科技有限公司 | Side-light-type light guide plate used for backlight module |
| CN207067439U (en) * | 2014-10-28 | 2018-03-02 | 旭硝子株式会社 | Glass light guide plate |
| CN104864311A (en) * | 2015-05-06 | 2015-08-26 | 广州创维平面显示科技有限公司 | Liquid crystal display device and downright and side entry hybrid backlight module |
| CN107728379B (en) * | 2017-11-10 | 2023-12-22 | 欧浦登（顺昌）光学有限公司 | Ultrathin direct type backlight flat-panel liquid crystal display module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202522726U (en) * | 2012-03-07 | 2012-11-07 | 昆山翰辉电子科技有限公司 | Light guide plate possessing light diffusion function |
| CN107422531A (en) * | 2017-08-14 | 2017-12-01 | 深圳创维－Rgb电子有限公司 | Mix incident type backlight module and liquid crystal display device |
| CN107526217A (en) * | 2017-10-19 | 2017-12-29 | 京东方科技集团股份有限公司 | Side entrance back module and display device |
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