CN115793133A - Side-in light guide plate with obliquely-cut cylindrical mesh points and backlight module - Google Patents
Side-in light guide plate with obliquely-cut cylindrical mesh points and backlight module Download PDFInfo
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- CN115793133A CN115793133A CN202310086059.6A CN202310086059A CN115793133A CN 115793133 A CN115793133 A CN 115793133A CN 202310086059 A CN202310086059 A CN 202310086059A CN 115793133 A CN115793133 A CN 115793133A
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- guide plate
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- 235000009537 plain noodles Nutrition 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention discloses a side-in light guide plate with obliquely-cut cylindrical mesh points, which comprises a light guide plate body, wherein the light guide plate body is provided with a light inlet surface, a first surface and a second surface, the first surface is a light outlet surface, the first surface and the second surface are oppositely arranged, the second surface is provided with a plurality of mesh points, the mesh points protrude from the second surface into the light guide plate body, the mesh points are provided with cylindrical light facing surfaces and cylindrical backlight surfaces, the cylindrical light facing surfaces are parts of cylindrical surfaces of cylinders, and the cylindrical surfaces are cut by the second surface and the backlight surfaces, and the cylinders are obliquely arranged relative to the second surface along the direction back to the light inlet surface. The invention also discloses a backlight module which consists of the light source and the side-in type light guide plate with the obliquely cut cylindrical mesh points. The invention increases the effective scattering area ratio in a limited range and can improve the light extraction efficiency.
Description
Technical Field
The present invention relates to a light guide plate and a backlight module, and more particularly, to a side-entry light guide plate and a backlight module with obliquely cut cylindrical dots.
Background
The lateral light guide plate has the working principle that a reflective dot structure is arranged on the bottom surface of the light guide plate, and light source rays which enter from the lateral direction are reflected by the reflective dot structure to be emitted from the top surface, so that a surface light source is formed. The scattering mesh points of the conventional light guide plate are simple rotation symmetrical mesh points, and because the scattering mesh points can play a role in reflection and are only the light-facing surfaces of the mesh point structures, a large part of the mesh points do not participate in the effective action of light. Some prior art dot structures are wedge-shaped, and the inclination angles of the light-facing surface and the backlight surface are set differently, that is, the inclination angle of the light-facing surface is smaller and the inclination angle of the backlight surface is larger, so as to increase the light-facing surface area, but the increased area is limited as a whole. Both the above two schemes are difficult to improve the light emitting efficiency.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the present invention provides a lateral-entrance light guide plate with obliquely cut cylindrical dots, which aims to improve the light scattering ability and light extraction efficiency of the dots. Another objective of the present invention is to provide a backlight module.
The technical scheme of the invention is as follows: the utility model provides a cloth has side income formula light guide plate of oblique cylinder site, includes the light guide plate body, the light guide plate body is equipped with income plain noodles, first face and second face, first face is the play plain noodles, first face with the second face sets up relatively, the second face is equipped with a plurality of sites, the site by the second face to this internal arch of light guide plate, the site is equipped with cylinder light facing surface and shady face, cylinder light facing surface is the cylinder of a cylinder by the second face with partly that the shady face was intercepted, the cylinder is to the dorsad the direction slope in of income plain noodles in the second face setting.
Another structure of the mesh points is as follows: the lattice point is provided with a cylindrical light-facing surface, a backlight surface, a top surface and two side wall surfaces, the top surface and the two side wall surfaces are connected between the cylindrical light-facing surface and the backlight surface, the top surface is parallel to the second surface, the two side wall surfaces are parallel to each other, the cylindrical light-facing surface is a part of a cylindrical surface of a cylinder, and the cylinder is inclined to the second surface in a direction away from the light-entering surface.
Furthermore, the inclination angle theta between the cylinder and the second surface is 10-45 degrees, and the inclination angle gamma between the backlight surface and the second surface is 90-theta-90 degrees. The inclination angle of the cylindrical light-facing surface is set to be 10-45 degrees, so that incident light can be emitted from the light-emitting surface more conveniently, the length of the cylindrical light-facing surface can be extended as far as possible to increase the area of the light-facing surface by selecting the angle between the angle perpendicular to the second surface and the angle perpendicular to the cylindrical light-facing surface, more incident light can be utilized, and the light efficiency is improved.
Further, the radius R of the bottom surface of the cylinder is determined by the following formula:
R=r/sinβ，β=arcsin（sinα/n）
whereinαThe maximum incident angle of the light source on the light incident surface is n, the refractive index of the light guide plate body is n, and the maximum design radius allowed by the single mesh point on the second surface is r. The radius size of the cylindrical light-receiving surface determined by the method can obtain the maximum light-receiving surface area in the limited screen dot projection area, so that the light-emitting efficiency is improved.
Further, the structure of the dots has a symmetry plane, the dots form a projection on the second plane, when l is not more than d/2, d =2r, where l is the length of the projection along the direction of the symmetry plane, d is the length of the projection along the direction opposite to the normal of the symmetry plane, and r is the maximum design radius allowed by a single dot on the second plane.
Furthermore, the structure of the mesh point has a symmetry plane, and the mesh point forms a projection on the second plane when l is>At the time of d/2, the ratio,
and l is the length of the projection along the direction of the symmetry plane, d is the length of the projection along the reverse direction of the normal of the symmetry plane, and r is the maximum design radius allowed by a single mesh point on the second plane.
The optimal mesh point arrangement parameters are obtained through the two schemes, and the maximum light-facing area is obtained.
Furthermore, the structure of the mesh point has a symmetry plane, and the symmetry plane is perpendicular to both the light incident surface and the second surface.
The other technical scheme of the invention is as follows: a backlight module comprises a plurality of light sources and the side-in type light guide plate with obliquely cut cylindrical mesh points, wherein the light sources are arranged on one side of the light incident surface of the side-in type light guide plate.
Compared with the prior art, the invention has the advantages that:
in the same mesh point size area, the effective scattering area proportion of the mesh points is increased, the arrangement density of the mesh points in unit area can be increased, the light-emitting efficiency of the light-emitting surface of the light guide plate can be improved, the mesh point structure is easy to manufacture, and the production cost is low.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment.
Fig. 2 is a schematic diagram of a cylinder to which the dot structure of embodiment 1 belongs.
Fig. 3 is a schematic top view of a side-entry light guide plate in the prior art.
Fig. 4 is a schematic diagram of the design size of the dot structure in embodiment 1.
FIG. 5 is a schematic top view of the dot structure of embodiment 1 when l is less than or equal to d/2.
FIG. 6 is a schematic top view of the dot structure of embodiment 1 when l > d/2.
Fig. 7 is a schematic diagram of an oblique cylinder to which the dot structure of embodiment 2 belongs.
Fig. 8 is a schematic side view of dots of example 2.
Fig. 9 is a schematic top view of the dots of embodiment 2.
Detailed description of the preferred embodiments
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto.
The overall light emitting effect (brightness, uniformity) of the light guide plate is generally improved by changing the shape and layout of the dots disposed on the second surface 13. The dot structure of the lateral-entrance light guide plate 1 with chamfered cylindrical dots according to the embodiment of the present invention is shown in fig. 2, the dot 3 is a part of an inclined cylinder a cut from a horizontal plane (which can be regarded as a second plane), and forms a shape enclosed by the cylinder surface of the cylinder a, the top surface of the cylinder a and the second plane, and the dot 3 is a concave dot formed by a second plane 13 protruding into the light guide plate body. The cylindrical surface of the cylinder A is a cylindrical light facing surface 31, the top surface of the cylinder A is a backlight surface 32, and during intercepting, the backlight surface 32 is smaller than half of the circular shape of the top surface of the cylinder A.
In order to maximize the utilization of the light-facing surface 31, the falling direction of the cylinder a is away from the light-incident surface 11, so the dots have a symmetrical structure, and the symmetrical plane is a plane perpendicular to both the light-incident surface 11 and the second surface 13. The angle of inclination of the cylinder a, i.e. the angle of inclination formed by the axis of the cylinder a and the second surface 13, is determined according to the angle of the light source after entering the light guide plate body and the angle requirement of the outgoing light on the outgoing surface 12. Generally, the inclination angle θ between the cylinder A and the second surface 13 is 10 ° to 45 °. It should be noted that the above-mentioned back light surface 32 is a specific setting of the inclination angle of the back light surface 32 on the top surface of the cylinder a, and it is easy to know that the inclination angle γ between the back light surface 32 and the second surface 13 is 90 ° - θ, and the inclination angle of the back light surface 32 can be set larger until the back light surface 32 is perpendicular to the second surface 13, and the inclination angle γ between the back light surface 32 and the second surface 13 is 90 °. The larger the inclination angle between the backlight surface 32 and the second surface 13 is, the larger the area of the cylindrical light-facing surface 31 can be obtained without changing the projection area of the mesh point on the second surface 13, and more light rays can be reflected.
The dot structure size of this embodiment can be determined by the following method, as shown in FIG. 3After the source 2 is determined, the maximum incident angle of the light source 2 on the light incident surface 11αAs is known, the refractive index of the light guide plate body is known as n, and the maximum design radius r (shown in fig. 4) allowed on the second surface 13 of each dot 3 is known. The light angle inside the light guide plate can be determined firstβ，β=arcsin（sinα/n) Radius R, R = of bottom surface of cylinder a to which cylindrical light-receiving surface 31 belongsr/sinβThe method can ensure that the effective action boundary of the net points is maximum and does not exceed the net point design area. Further, the relationship between other parameters of the mesh points can be obtained
l is the length of the dot projection along the direction of the symmetry plane (the dot bottom length), d is the length of the dot projection along the reverse direction of the normal of the symmetry plane (the dot bottom width), d is set to be the maximum size, i.e. d =2r, at this time, l is obtained by calculation, and if l is less than or equal to d/2, the obtained result is the dot size, as shown in fig. 5.
When the radius R of the bottom surface of the cylinder and the inclination angle θ between the cylinder a and the second surface 13 are both small, there is a case that the dot bottom length l is greater than d/2, as shown in fig. 6, at this time, 2R is still used as the dot bottom width d, and the finally formed dot 3 will exceed the design area. Therefore, one half of the diagonal line of the envelope rectangle formed by the length l and the width d of the bottom surface of the lattice point is taken as the radius of the design area, and d is adjusted to enable
Thereby obtaining the dot size.
A specific example of the dot structure is a structure having a maximum light-emitting angle ofαThe light source of =60 degrees enters the light guide plate body made of PMMA (n = 1.49), and the maximum angle in the light guide plate bodyβIn the range of [0 °, 35.5 ° ]]. The designed area of the screen dot is required to be in the area with the radius R less than or equal to 30 mu m, and then the radius R = 30/sin35.5 degrees and is approximately equal to 51.7 mu m. The inclination angle theta between the cylinder and the second surface is set to 45 DEG, d is 60 mu m, R d About 9.6 μm. The height of the cylinder section is selected, namely the height of the screen dot is h about 6.8 mu m, the length of the screen dot is l about 13.6 mu m < d/2, which shows that the designed screen dot meetsThe smooth arc length boundary does not exceed its design area.
In embodiment 2, please refer to fig. 7 to 9, the dots of this embodiment have a cylindrical light-facing surface 301, a backlight surface 302, a top surface 303 and two side wall surfaces 304, and the symmetry manner is the same as that of embodiment 1. The dot structure is substantially a partial structure cut out from the oblique cylinder B, the top surface 303 and the two side wall surfaces 304 are connected between the cylindrical light-facing surface 301 and the backlight surface 302, the top surface 303 is parallel to the second surface 13 (i.e., the top surface of the oblique cylinder B), the two side wall surfaces 304 are parallel to each other (i.e., the side surfaces formed by downward straight cutting with the maximum width d), and the way of tilting the generatrix of the oblique cylinder B is the same as that of embodiment 1. When the screen dot is designed with d =2r,
and then, the projection of the bottom surface of the mesh point is larger than the mesh point design area with the radius r, and the integral proportion of the mesh point is adjusted according to actual requirements.
Compared with the spherical mesh points in the prior art, please refer to fig. 2, the boundary of the main light receiving area 41 of the spherical mesh point 4 only occupies a small part of all the boundaries of the mesh point, and the rest of the main light receiving area except the symmetrical non-light receiving area 42 is a partial light receiving area, so that the ratio of light rays to effectively act on the surface of a single spherical mesh point is limited, and the length of the light receiving boundary and the light receiving area of the cylindrical mesh point are increased, and compared with the conventional conical, hemispherical and other fully symmetrical mesh points, the light extraction efficiency and the brightness of the light guide plate can be improved.
The light-emitting simulation is carried out aiming at the fully-symmetrical crater mesh points of the existing hot-pressing process and the mesh points of the invention, wherein the projection height of the crater mesh points in the light guide plate is 2.2 mu m, the height of the inner ring deposit is 1.3 mu m, the height of the outer ring deposit is 0.5 mu m, and the diameter of the mesh points is 54 mu m. The chamfered cylindrical mesh point of the invention is determined according to the mode of embodiment 1 by the design radius r =27 μm, and the light-facing surface angle of the mesh point is 32 °. The average brightness of the single points of the crater dots is about 343.1 Nit, the average brightness of the single points of the dots is about 404.6 Nit, and compared with the crater dots, the brightness of the dots is improved by 17.92 percent. The average brightness of the mesh points is about 43538 Nit, the average brightness of the mesh points is about 49103 Nit, and compared with the mesh points, the luminous brightness of the mesh points is improved by 11.95%.
Claims (9)
1. The utility model provides a cloth has side income formula light guide plate of oblique cylinder site which characterized in that, includes the light guide plate body, the light guide plate body is equipped with income plain noodles, first face and second face, first face is for going out the plain noodles, first face with the second face sets up relatively, the second face is equipped with a plurality of sites, the site by the second face by it is internal protruding to the light guide plate, the site is equipped with cylinder light facing surface and shady face, cylinder light facing surface is the cylinder by the cylinder of a cylinder the second face with partly that the shady face was intercepted, the cylinder is to the direction slope that is kept away from the income plain noodles in the setting of second face.
2. The utility model provides a cloth has side income formula light guide plate of oblique cylinder site, a serial communication port, includes the light guide plate body, the light guide plate body is equipped with income plain noodles, first face and second face, first face is for going out the plain noodles, first face with the second face sets up relatively, the second face is equipped with a plurality of site, the site is equipped with cylinder and meets plain noodles, shady face, top surface and two side wall surfaces, the top surface and two the side wall surface all connect in the cylinder meet the plain noodles with between the shady face, the top surface with the second face is parallel, two the side wall surface is parallel to each other, the cylinder is met the plain noodles and is a part of the cylinder of cylinder, the cylinder is faced away from to the side the direction slope of going in the plain noodles in the second face sets up.
3. The edge-type light guide plate with oblique-cut cylindrical dots as claimed in claim 1, wherein the angle θ between the cylinder and the second surface is 10 ° -45 °, and the angle γ between the backlight surface and the second surface is 90 ° - θ -90 °.
4. The edge-lit lightguide of claim 1 or 2, wherein the radius R of the bottom surface of the cylinder is determined by the following formula:
R= r/sinβ，β= arcsin（sinα/n）
whereinαThe maximum incident angle of the light source on the light incident surface is defined as n, the refractive index of the light guide plate body is defined as n, and r is the maximum design radius allowed by the single mesh point on the second surface.
5. The edge-type light guide plate of claim 1, wherein the structure of the dots has a symmetry plane, and the dots form a projection on the second plane, when l ≦ d/2, d =2r, where l is the length of the projection along the symmetry plane, d is the length of the projection along the normal of the symmetry plane in the reverse direction, and r is the maximum design radius allowed by a single dot on the second plane.
6. The light guide plate of claim 1, wherein the structure of the screen dots has a symmetry plane, and the screen dots form a projection on the second plane when the screen dots form a slant angle>At the time of d/2, the ratio,
and l is the length of the projection along the direction of the symmetry plane, d is the length of the projection along the reverse direction of the normal of the symmetry plane, and r is the maximum design radius allowed by a single mesh point on the second plane.
7. The edge-lit light guide plate of claim 1, wherein the screen dots have a symmetry plane perpendicular to both the incident surface and the second surface.
8. A backlight module, comprising a plurality of light sources and the lateral light guide plate with chamfered cylindrical dots as claimed in any one of claims 1 to 3 and 5 to 7, wherein the light sources are disposed on one side of the light incident surface of the lateral light guide plate with chamfered cylindrical dots.
9. A backlight module is characterized by comprising a plurality of light sources and the side-in light guide plate with the obliquely cut cylindrical mesh points as claimed in claim 4, wherein the light sources are arranged on one side of the light incident surface of the side-in light guide plate with the obliquely cut cylindrical mesh points.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310086059.6A CN115793133A (en) | 2023-02-09 | 2023-02-09 | Side-in light guide plate with obliquely-cut cylindrical mesh points and backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310086059.6A CN115793133A (en) | 2023-02-09 | 2023-02-09 | Side-in light guide plate with obliquely-cut cylindrical mesh points and backlight module |
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| Publication Number | Publication Date |
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| CN115793133A true CN115793133A (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310086059.6A Pending CN115793133A (en) | 2023-02-09 | 2023-02-09 | Side-in light guide plate with obliquely-cut cylindrical mesh points and backlight module |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407381A (en) * | 2001-09-07 | 2003-04-02 | 三星电子株式会社 | Brightness-raising optical panel and liquid crystal display device therewith |
| CN1758074A (en) * | 2005-10-28 | 2006-04-12 | 财团法人国家实验研究院国家高速网络与计算中心 | Microstructure of light conducting plate |
| JP2006185628A (en) * | 2004-12-24 | 2006-07-13 | Harison Toshiba Lighting Corp | Backlight |
| US20060198598A1 (en) * | 2005-03-01 | 2006-09-07 | Wintek Corporation | Light-guide plate |
| JP2009176563A (en) * | 2008-01-24 | 2009-08-06 | Harison Toshiba Lighting Corp | Backlight |
| CN202955650U (en) * | 2012-12-17 | 2013-05-29 | 上海冠旗电子新材料股份有限公司 | Light guide plate for backlight module |
| CN103883930A (en) * | 2012-12-21 | 2014-06-25 | 群康科技(深圳)有限公司 | Backlight module and display device |
| CN216160867U (en) * | 2021-06-07 | 2022-04-01 | 苏州天禄光科技股份有限公司 | Light guide plate |
| CN217932155U (en) * | 2022-06-27 | 2022-11-29 | 盐城维旺科技有限公司 | Backlight module |
-
2023
- 2023-02-09 CN CN202310086059.6A patent/CN115793133A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407381A (en) * | 2001-09-07 | 2003-04-02 | 三星电子株式会社 | Brightness-raising optical panel and liquid crystal display device therewith |
| JP2006185628A (en) * | 2004-12-24 | 2006-07-13 | Harison Toshiba Lighting Corp | Backlight |
| US20060198598A1 (en) * | 2005-03-01 | 2006-09-07 | Wintek Corporation | Light-guide plate |
| CN1758074A (en) * | 2005-10-28 | 2006-04-12 | 财团法人国家实验研究院国家高速网络与计算中心 | Microstructure of light conducting plate |
| JP2009176563A (en) * | 2008-01-24 | 2009-08-06 | Harison Toshiba Lighting Corp | Backlight |
| CN202955650U (en) * | 2012-12-17 | 2013-05-29 | 上海冠旗电子新材料股份有限公司 | Light guide plate for backlight module |
| CN103883930A (en) * | 2012-12-21 | 2014-06-25 | 群康科技(深圳)有限公司 | Backlight module and display device |
| CN216160867U (en) * | 2021-06-07 | 2022-04-01 | 苏州天禄光科技股份有限公司 | Light guide plate |
| CN217932155U (en) * | 2022-06-27 | 2022-11-29 | 盐城维旺科技有限公司 | Backlight module |
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Application publication date: 20230314 |
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