Light guide plate capable of improving brightness and backlight module

Abstract

The utility model belongs to the technical field of display, and mainly relates to a light guide plate capable of improving brightness and a backlight module, the light guide plate capable of improving brightness comprises a light guide plate body, and the light guide plate body comprises a light incident surface, a reflecting surface perpendicular to the light incident surface and a light emergent surface opposite to the reflecting surface; the micro-structures are formed on the reflecting surface, each micro-structure comprises a bulge and a groove surrounding the bulge, the groove comprises a first wall surface, the bulge comprises a second wall surface, the first wall surface is smoothly connected with the second wall surface, and a part of the first wall surface and a part of the second wall surface facing the light incident surface form a light adjusting surface. The inclination angle of the light adjusting surface relative to the light emitting surface of the reflecting surface ranges from 41 degrees to 47 degrees.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light guide plate and a backlight module for improving brightness. Background Art

[0002] The light guide plate has a light incident surface, a light emitting surface, and a reflective surface. The light provided by the light source enters the light guide plate from the light incident surface of the light guide plate, and then exits from the light emitting surface of the light guide plate. In order to make the light passing through the inside of the light guide plate more evenly mixed, a microstructure is usually set on the light emitting surface or the reflective surface of the light guide plate.

[0003] In the related art, the shape of the microstructure is usually designed based on the direction in which the light can be evenly mixed, but this ignores the fact that when the light can be evenly mixed, a part of the light is emitted obliquely from the light output surface, and this part of the light is not fully utilized, causing the light output brightness of the light guide plate to be affected. Utility Model Content

[0004] In order to solve the above problems, a side-entry light guide plate is implemented to guide the light emitted by the light source as far as possible toward the light output surface, thereby improving the brightness of the light guide plate. The present application provides a light guide plate with improved brightness.

[0005] First aspect

[0006] A light guide plate for improving brightness, comprising:

[0007] A light guide plate body, the light guide plate body comprising a light incident surface, a reflective surface perpendicular to the light incident surface, and a light emitting surface arranged opposite to the reflective surface; and

[0008] A plurality of microstructures are formed on the reflective surface, each of the microstructures includes a protrusion and a groove surrounding the protrusion, the groove includes a first wall surface, the protrusion includes a second wall surface, the first wall surface and the second wall surface are smoothly connected, and the portion of the first wall surface and / or the second wall surface facing the light incident surface is defined as a light-facing surface, and the inclination angle of the light-facing surface is between 41 and 47 degrees.

[0009] In one embodiment, the width of the groove is between 5-6 microns, and the width of the protrusion is between 30-35 microns.

[0010] In one embodiment, the depth of the groove is between 3 and 4 microns.

[0011] In one embodiment, both the first wall surface and the second wall surface are smooth surfaces.

[0012] In one embodiment, the density of the microstructures gradually increases from a direction close to the light incident surface to a direction away from the light incident surface.

[0013] In one embodiment, the groove is semi-elliptical or semi-circular.

[0014] In one embodiment, the light emitting surface is provided with light emitting dots.

[0015] Second aspect

[0016] A side-lit backlight module, comprising:

[0017] A light guide plate as described above;

[0018] A light source is disposed adjacent to the light incident surface of the light guide plate;

[0019] An optical film group, arranged on the light emitting surface of the light guide plate; and

[0020] The reflective sheet is arranged on a side of the light guide plate away from the optical film sheet group.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. The light guide plate capable of improving brightness provided by the present application, wherein microstructures are formed on the reflective surface, each microstructure comprises a protrusion and a groove surrounding the protrusion, the groove comprises a first wall surface, the protrusion comprises a second wall surface, the first wall surface and the second wall surface are smoothly connected, the portion of the first wall surface and / or the second wall surface facing the light incident surface is defined as a light facing surface, the inclination angle of the light facing surface is between 41 and 47 degrees, the first wall surface and / or the second wall surface can guide the emission direction of light, so that as much light incident on the reflective surface as possible is emitted from a direction perpendicular to the light emitting surface, thereby improving the brightness of the light guide plate;

[0023] 2. The light guide plate provided in the present application includes a plurality of protrusions, thereby preventing the light guide plate and the reflective layer below the light guide plate from being adsorbed together due to static electricity, thereby preventing glare caused by adsorption from affecting the quality of the display panel;

[0024] 3. The first wall surface and the second wall surface of the present application are both smooth surfaces, which can reduce the diffuse reflection and scattering of light, thereby improving the brightness of the light guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a structural schematic diagram of a backlight module provided in Example 1 of the present application;

[0026] Figure 2 yes Figure 1 A schematic diagram of the light path of a light guide plate for improving brightness included in the provided backlight module;

[0027] Figure 3 (A) is a conventional light guide plate light output brightness color block diagram;

[0028] Figure 3 (B)-3(C) are respectively the color block diagrams of the light output brightness of the light guide plate of the present application in two tests.

[0029] Description of reference numerals:

[0030] 1. Light guide plate body; 11. Light incident surface; 12. Reflection surface; 13. Light emitting surface; 2. Microstructure; 20. Protrusion; 22. Groove; 201. First wall surface; 220. Second wall surface; 330. Light-facing surface; 5. Optical film group; 4. Light source; 100. Light guide plate; 6. Reflection sheet. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] See also Figure 1 The present application provides an edge-lit backlight module, comprising: a light guide plate 100, a light source 4, and an optical film set 5. It is understood that in other embodiments, a reflective sheet 6 is also included.

[0033] The light guide plate 100 includes a light guide plate body 1 and a plurality of microstructures 2. The light guide plate body 1 includes a light incident surface 11, a reflective surface 12 perpendicular to the light incident surface 11, and a light emitting surface 13 disposed opposite to the reflective surface 12.

[0034] The microstructure 2 is formed on the reflecting surface 12, and each microstructure 2 includes a protrusion 20 and a groove 22 surrounding the protrusion 20, the groove 22 includes a first wall 201, the protrusion 20 includes a second wall 220, the first wall 201 and the second wall 220 are smoothly connected, and the portion of the first wall 201 facing the light incident surface 11 is defined as a light-facing surface 330, and the inclination angle of the light-facing surface 330 is between 41 and 47 degrees, preferably 45 degrees.

[0035] Please also read Figure 2 The microstructure 2 in the present application makes the first wall surface 201 and the second wall surface 220 smoothly connected to form the light-facing surface 330. In the related art, the crater is generally processed by laser mold, and the light guide plate is formed by the mold. Due to the serious splashing of the crater ring, the crater on the mold is relatively rough, and the finally formed point light-facing angle is generally 30-40 degrees. This causes some light to be emitted obliquely.

[0036] The present application improves the formation method of the crater on the surface of the mold and the material around the crater of the mold, and forms a groove 22 corresponding to the position of the crater on the light guide plate 100, and utilizes the preset angled light-facing surface 330 of the groove 22 to participate in the reflection of light, and makes the inclination angle of the light adjustment surface relative to the light emitting surface 13 of the reflecting surface 12 be between 40-45 degrees, so that as much light as possible is emitted from the direction perpendicular to the light emitting surface 13 of the light guide plate, thereby improving the light utilization efficiency and the brightness of the light guide plate 100.

[0037] In this embodiment, the groove 22 is semicircular. In other embodiments, the groove 22 can also be semi-elliptical.

[0038] In other embodiments, the light emitting surface 13 is provided with light emitting grid points.

[0039] In this embodiment, the width W of the groove 22 is between 5-7 microns, and the width w of the protrusion 20 is between 30-35 microns. The sum of the width w of the protrusion 20 and the width W of the groove 22 is between 40 microns and 45 microns, and the microstructure 2 is less than 50 microns, which can avoid the problem of visible dots.

[0040] In this embodiment, the depth d of the groove 22 is between 3 and 4 microns. Preferably, the depth of the groove 22 is 3.5 microns. Because the groove 22 is formed by mold forming, if the depth of the groove 22 is too deep or too shallow, it means that the height of the convex point corresponding to the groove 22 on the mold is higher or lower. The higher one puts higher requirements on the processing accuracy of the mold, and the lower one is less helpful for the reflection effect of light.

[0041] In this embodiment, the first wall surface 201 and the second wall surface 220 are both smooth surfaces. The smooth surface can reduce scattered light, thereby improving the brightness of the light guide plate 100.

[0042] The light source 4 is disposed adjacent to the light incident surface 11 of the light guide plate; in this embodiment, the light source 4 is an LED.

[0043] The optical film set 5 is disposed on the light emitting surface 13 of the light guide plate 100. The optical film set 5 generally includes a diffusion film and a brightness enhancement film.

[0044] In other embodiments, the density of the microstructures 2 gradually increases from a direction close to the light incident surface 11 to a direction away from the light incident surface 11 .

[0045] Table 1

[0046]

[0047]

[0048] See Table 1 and Figure 3(A)-3(C), Figure 3 (A) is to select 81 coordinate points on a conventional light guide plate to detect the brightness of the light emitting surface 13, Figure 3 (B) and 3(C) are respectively 81 coordinate points selected on the light guide plate of the present application to detect the brightness value. Table 1 compares the structure of the light guide plate 100 of the present application with that of a conventional light guide plate with dots. The conventional light guide plate adopts a common concave dot microstructure 2 set on the reflective surface 12. The light guide plate 100 of the present application was tested twice, and each time 81 coordinate points were selected on the light guide plate to detect the brightness value. It can be seen that the average brightness value of the 81 coordinate points of the conventional light guide plate is 6323 lumens. The average brightness value of the 81 coordinate points selected for the first time of the light guide plate 100 of the present application is 6950 lumens, and the average brightness value of the 81 coordinate points selected for the second time of the light guide plate 100 of the present application is 6980 lumens. In other words, by adopting the structure of the light guide plate 100 of the present application, the brightness can be improved by 10%.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A light guide plate for improving brightness, characterized in that: include: A light guide plate body (1), the light guide plate body (1) comprising a light incident surface (11), a reflection surface (12) perpendicular to the light incident surface (11), and a light emitting surface (13) arranged opposite to the reflection surface (12); and A plurality of microstructures (2), wherein the microstructures (2) are formed on the reflective surface (12), each of the microstructures (2) comprises a protrusion (20) and a groove (22) surrounding the protrusion (20), wherein the groove (22) comprises a first wall surface (201), and the protrusion (20) comprises a second wall surface (220), wherein the first wall surface (201) and the second wall surface (220) are smoothly connected, and a portion of the first wall surface (201) and / or the second wall surface (220) facing the light incident surface (11) is defined as a light-facing surface (330), and an inclination angle of the light-facing surface (330) is between 41 and 47 degrees.

2. The light guide plate for improving brightness according to claim 1, characterized in that: The width of the groove (22) is between 5 and 7 micrometers, and the width of the protrusion (20) is between 30 and 35 micrometers.

3. The light guide plate for improving brightness according to claim 2, characterized in that: The depth of the groove (22) is between 3 and 4 micrometers.

4. The light guide plate for improving brightness according to claim 3, characterized in that: The first wall surface (201) and the second wall surface (220) are both smooth surfaces.

5. The light guide plate for improving brightness according to any one of claims 1 to 4, characterized in that: The density of the microstructure (2) gradually increases from a direction close to the light incident surface (11) to a direction away from the light incident surface (11).

6. The light guide plate for improving brightness according to any one of claims 1 to 4, characterized in that: The groove (22) is semi-elliptical or semi-circular.

7. The light guide plate for improving brightness according to any one of claims 1 to 4, characterized in that: The light emitting surface (13) is provided with light emitting grid points.

8. A backlight module, characterized in that: include: The light guide plate according to any one of claims 1 to 7; Light source (4); Disposed adjacent to the light incident surface (11) of the light guide plate; An optical film group (5) is arranged on the light emitting surface (13) of the light guide plate; and A reflective sheet (6) is arranged on a side of the light guide plate that is away from the optical film sheet group (5).

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