Light guide plate, backlight module and display device

Abstract

The present application relates to a light guide plate, a backlight module and a display device, and to the technical field of backlight display. The light guide plate includes a light incident side of the light guide plate, each of the notches has a first light reflecting layer and a second light reflecting layer, and a first position point for accommodating a light source is provided between the first light reflecting layer and the second light reflecting layer; wherein the first light reflecting layer and the second light reflecting layer are used to guide the light emitted by the light source to the side away from the light incident side. The backlight module includes the light guide plate, a plurality of light sources and a first reflective sheet, the light source is provided at the first position point; the first reflective sheet is bonded to the bottom surface of the light guide plate. The present application has the advantages of eliminating the light and dark alternation phenomenon on the display panel of the display device, and also has the advantage of better light uniformity.

Description

Technical Field

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

[0002] A side-entry light guide plate is an optical element that converts a linear light source composed of LED lights into a surface light source. When in use, a plurality of LED lights are arranged side by side on one side of the light-incident side of the light guide plate, and the light emitted by the plurality of LED lights is incident into the light guide plate from the light-incident side.

[0003] As Figure 1 shown, affected by the actual production process, there must be a certain distance between two adjacent LED lights. At the same time, limited by the light-emitting angle of each LED light, a blind area will be generated between two adjacent LED lights. The area of this blind area is relatively dark, while the front of the LED light is the light-emitting area, and the area of this light-emitting area is relatively bright. This will cause a phenomenon of alternating light and dark on the display panel of the display device. Summary of the Invention

[0004] The present application aims to at least solve the technical problems in the prior art that cause the phenomenon of alternating light and dark on the display panel and the poor light-emitting uniformity of the light guide plate. For this purpose, the present application provides a light guide plate, a backlight module and a display device.

[0005] In a first aspect, the present application provides a light guide plate.

[0006] The light guide plate has a light-incident side and a light-emitting surface. The light-incident side is provided with gaps at intervals. Each gap is correspondingly provided with a first reflective layer and a second reflective layer. There is a first position point for accommodating a light source between the first reflective layer and the second reflective layer; wherein, the first reflective layer and the second reflective layer are used for guiding the light emitted by the light source to the light-emitting surface.

[0007] By adopting the above technical solution, the first position point is arranged in the area between the first reflective layer and the second reflective layer. When arranging the light sources at the first position points in this area, the first reflective layer or the second reflective layer separates two adjacent light sources. The light emitted by the two adjacent light sources is incident into the light guide plate after being reflected by the first reflective layer and / or the second reflective layer, so that a blind area will not be generated in the area of the light-incident side, and the phenomenon of alternating light and dark on the display panel of the display device can be eliminated.

[0008] According to an embodiment of the present application, one end of the first reflective layer facing away from the light-emitting surface of the light guide plate is located below the first position point corresponding to the first reflective layer; or one end of the second reflective layer facing away from the light-emitting surface of the light guide plate is located below the first position point corresponding to the second reflective layer.

[0009] By adopting the above technical solution, part of the light incident on the light-emitting surface of the light guide plate parallel to the light guide plate can be reflected by the first reflective layer or the second reflective layer to change its direction and improve the light utilization rate.

[0010] According to an embodiment of the present application, the line connecting one end of the first reflective layer facing away from the light-emitting surface of the light guide plate and one end of the second reflective layer facing away from the light-emitting surface of the light guide plate is perpendicular to the light-emitting surface of the light guide plate.

[0011] By adopting the above technical solution, it is possible to avoid a single notch deviating inward or outward from other notches, resulting in an over-sized light guide plate.

[0012] According to an embodiment of the present application, a plurality of the notches divide the light-incident side into a plurality of first light-incident portions. The first light-incident portions are wedge-shaped. The first light-incident portion includes a first light-incident surface perpendicular to the light-incident side and a first connection surface obliquely connected to the first light-incident side. The first reflective layer or the second reflective layer is plated on the first connection surface.

[0013] By adopting the above technical solution, the light concentration area on the light-emitting surface of the light guide plate is relatively large, the light emitted by the light source is more divergent in the light guide plate, and the light-emitting uniformity of the light guide plate is better.

[0014] According to an embodiment of the present application, a plurality of the notches further divide the light-incident side into second light-incident portions. The second light-incident portions are wedge-shaped. The second light-incident portion includes a second light-incident surface obliquely connected to the first light-incident side and a second connection surface coplanar with the light-emitting surface. The first reflective layer is plated on the second connection surface.

[0015] By adopting the above technical solution, the light concentration area on the light-emitting surface of the light guide plate is even larger, the light emitted by the light source is even more divergent in the light guide plate, and the light-emitting uniformity of the light guide plate is even better.

[0016] According to an embodiment of the present application, the light-emitting surface of the light guide plate is provided with a plurality of microstructures.

[0017] By adopting the above technical solution, the light-emitting uniformity can be further improved by providing a plurality of microstructures.

[0018] According to an embodiment of the present application, the angle between the line connecting the second position point and the first position point of the first reflective layer and the first reflective layer is within a first preset angle range. The first preset angle range is from 0° to 90°. The angle between the line connecting the third position point and the first position point of the second reflective layer and the second reflective layer is within a second preset angle range. The second preset angle range is from 0° to 90°.

[0019] By adopting the above technical solution, it is used to eliminate the situation where part of the optical path is incident away from the light guide plate, reduce the phenomenon of light and dark alternation on the display panel of the display device, and also make its light output uniformity better.

[0020] In a second aspect, the present application also provides a backlight module, including any one of the above embodiments:

[0021] A light guide plate;

[0022] A plurality of light sources, the light sources are arranged at the first position point; and

[0023] A first reflective sheet, the first reflective sheet is adhesively arranged on the bottom surface of the light guide plate.

[0024] By adopting the above technical solution, part of the light incident on the bottom surface of the light guide plate can be guided to the light output surface of the light guide plate through the reflection of the first reflective sheet.

[0025] According to an embodiment of the present application, the backlight module further includes: a second reflective sheet;

[0026] By adopting the above technical solution, part of the light incident on the side of the light guide plate away from the light incident side can be guided to the light output surface of the light guide plate through the reflection of the second reflective sheet.

[0027] In a third aspect, the present application also provides a display device, including the backlight module described in any one of the above embodiments.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The first position point is set in the area between the first reflective layer and the second reflective layer. When arranging the light sources at the first position point in this area, the first reflective layer or the second reflective layer separates two adjacent light sources. The light emitted by the two adjacent light sources is incident on the light guide plate after being reflected by the first reflective layer and / or the second reflective layer, so that no blind area will be generated in the area of the light incident side, and the phenomenon of light and dark alternation on the display panel of the display device can be eliminated.

[0030] 2. One end of the first reflective layer away from the light output surface is below the first position point corresponding to the first reflective layer; or one end of the second reflective layer away from the light output surface is below the first position point corresponding to the second reflective layer, which can make part of the light incident parallel to the light output surface of the light guide plate change its direction after being reflected by the first reflective layer or the second reflective layer, and improve the light utilization rate.

[0031] 3. Each notch is perpendicular to the light output surface of the light guide plate at the connection line between the ends of the first reflective layer and the second reflective layer, which can prevent a single notch from deviating inward or outward from other notches, resulting in an over-sized light guide plate. Brief Description of the Drawings

[0032] Figure 1 is a schematic structural view of a light guide plate provided in the related art;

[0033] Figure 2 One of the schematic structural views of the light guide plate provided in an embodiment of the present application;

[0034] Figure 3 Another schematic structural view of the light guide plate provided in an embodiment of the present application;

[0035] Figure 4 Another schematic structural view of the light guide plate provided in an embodiment of the present application;

[0036] Figure 5 Another schematic structural view of the light guide plate provided in an embodiment of the present application;

[0037] Figure 6 is Figure 5 a partial enlarged view of part A in;

[0038] Figure 7 Another schematic structural view of the light guide plate provided in an embodiment of the present application;

[0039] Figure 8 is Figure 7 a partial enlarged view of part B in;

[0040] Figure 9 Another schematic structural view of the light guide plate provided in an embodiment of the present application;

[0041] Reference Signs:

[0042] 100, light guide plate; 110, notch; 111, first reflective layer; 112, second reflective layer; 113, first light incident portion; 1131, first light incident surface; 1132, first connection surface; 114, second light incident portion; 1141, second light incident surface; 1142, second connection surface; a, first position point; b, second position point; c, third position point; 11a, light emitting surface. Detailed Description of the Embodiments

[0043] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.

[0044] The following refers to Figures 2 - 8 to describe the light guide plate according to the embodiments of the present application.

[0045] As Figure 2As shown, the light guide plate 100 has a light incident side and a light emitting surface 11a, and notches 110 are spaced apart on the light incident side.

[0046] As Figure 3 and Figure 4 shown, a first reflective layer 111 and a second reflective layer 112 are correspondingly arranged for each notch 110, and a first position point a for accommodating a light source is provided between the first reflective layer 111 and the second reflective layer 112.

[0047] It can be understood that when the light source is placed at the first position point a, the light emitted by the light source can enter the light guide plate 100 between the first reflective layer 111 and the second reflective layer 112, or can enter the light guide plate 100 after being reflected one or more times by the first reflective layer 111 and the second reflective layer 112, and then these lights are emitted from the light emitting surface 11a of the light guide plate 100.

[0048] In the related art, as Figure 1 shown, a row of light sources is arranged on one side of the light incident side of the light guide plate 100, and the row of light sources is parallel to the light incident side. In this arrangement, a blind area will be generated in the area of the light incident side between two adjacent light sources, and this area is relatively dark; while the area directly opposite to the light source is the light emitting area, and this light emitting area is relatively bright, which will cause an alternating light and dark phenomenon on the display panel of the display device.

[0049] In addition, the light emitted by each LED lamp enters the light guide plate 100 and is relatively concentrated in a certain area of the light emitting surface 11a of the light guide plate 100 (this area is the light concentration area, and this light concentration area is small), resulting in poor light emission uniformity of the light guide plate 100.

[0050] In the embodiment of the present application described above, the first position point a is arranged in the area between the first reflective layer 111 and the second reflective layer 112. When arranging the light source at the first position point a in this area, the first reflective layer 111 or the second reflective layer 112 separates two adjacent light sources, and the light emitted by the two adjacent light sources enters the light guide plate 100 after being reflected by the first reflective layer 111 and / or the second reflective layer 112, so that a blind area will not be generated in the area of the light incident side, and the alternating light and dark phenomenon appearing on the display panel of the display device can be eliminated.

[0051] At the same time, the light emitted by a single light source enters the light guide plate 100 more divergently, the light concentration area of the light emitting surface 11a is larger, and the light emission uniformity of the light guide plate 100 is better.

[0052] According to the light guide plate provided by the embodiment of the present application, by providing the first position point a for accommodating the light source between the first reflective layer 111 and the second reflective layer 112, the alternating light and dark phenomenon appearing on the display panel of the display device can be eliminated, and at the same time, it also has the advantage of better light emission uniformity.

[0053] In some embodiments, the specific arrangement positions of the first reflective layer 111 and the second reflective layer 112 shall follow the following rules:

[0054] As Figure 5 and Figure 7 shown, the angle between the line connecting the second position point b and the first position point a of the first reflective layer 111 and the first reflective layer 111 is within a first preset angle range, and the first preset angle range is from 0° to 90°.

[0055] The angle between the line connecting the third position point c and the first position point a of the second reflective layer 112 and the second reflective layer 112 is within a second preset angle range, and the second preset angle range is from 0° to 90°.

[0056] When the first reflective layer 111 and the second reflective layer 112 are arranged according to the above rules, the straight line from the first position point a to any position point on the first reflective layer 111 or the second reflective layer 112 is the transmission optical path emitted by the light source.

[0057] As Figure 6 and Figure 8 shown, the line connecting the first position point a and the second position point b of the first reflective layer 111 is the straight line a, and there is an angle α between the straight line a and the first reflective layer 111. The angle α is in the direction away from the light guide plate 100 or the angle α is 0°, and the angle α is within the first preset angle range.

[0058] At the same time, the line connecting the first position point a and the third position point c of the second reflective layer 112 is the straight line b, and there is an angle β between the straight line b and the second reflective layer 112. The angle β is in the direction away from the light guide plate 100 or the angle β is 0°, and the angle β is within the second preset angle range.

[0059] It can be understood that changes in the first preset angle and the second preset angle will cause changes in the transmission optical path of the light source. When selecting the ranges of the first preset angle and the second preset angle, the situation where part of the optical path is incident away from the light guide plate 100 should be excluded.

[0060] And the first preset angle range from 0° to 90° and the second preset angle range from 0° to 90° can ensure the maximum utilization rate of light. For example, the angle α can be 60°, and the angle β can be 30°.

[0061] In some embodiments, as Figure 4 shown, one end of the first reflective layer 111 away from the light-emitting surface 11a is below the first position point a corresponding to the first reflective layer 111; or one end of the second reflective layer 112 away from the light-emitting surface 11a is below the first position point a corresponding to the second reflective layer 112.

[0062] With such a design, for the light incident on the light-emitting surface 11a parallel to the light guide plate 100, after being reflected by the first reflective layer 111 or the second reflective layer 112, its direction can be changed, further improving the light utilization rate.

[0063] In actual implementation, the multiple notches 110 can be triangular prism-shaped notches, quadrangular prism-shaped notches or other possible notches.

[0064] Two possible structures of the light guide plate are shown below.

[0065] Example 1, as Figure 3 and Figure 9 shown, the multiple notches 110 divide the light-incident side into multiple first light-incident parts 113. The first light-incident parts 113 are wedge-shaped. The first light-incident part 113 includes a first light-incident surface 1131 perpendicular to the light-incident side and a first connection surface 1132 obliquely connected to the first light-incident side. The first reflective layer 111 or the second reflective layer 112 is plated on the first connection surface 1132.

[0066] Example 2, as Figure 4 and Figure 5 shown, the multiple notches 110 divide the light-incident side into multiple first light-incident parts 113 and a second light-incident part 114. The first light-incident parts 113 are wedge-shaped. The first light-incident part 113 includes a first light-incident surface 1131 perpendicular to the light-incident side and a first connection surface 1132 obliquely connected to the first light-incident side. The first reflective layer 111 or the second reflective layer 112 is plated on the first connection surface 1131. The second light-incident part 114 is wedge-shaped. The second light-incident part 114 includes a second light-incident surface 1141 obliquely connected to the first light-incident side and a second connection surface 1142 coplanar with the light-emitting surface 11a. The first reflective layer 111 is plated on the second connection surface 1142.

[0067] Compared with the light path shown in Example 1 (Appendix Figure 9 ), obviously for the light path shown in Example 2 (Appendix Figure 5 ), the light concentration area on the light-emitting surface 11a of the light guide plate 100 is larger, the light emitted by the light source is more divergent in the light guide plate 100, and the light emission uniformity of the light guide plate 100 is better.

[0068] In some embodiments, as Figure 4 shown, the connection line between one end of the first reflective layer 111 away from the light-emitting surface 11a and one end of the second reflective layer 112 away from the light-emitting surface 11a is perpendicular to the light-emitting surface 11a.

[0069] With such a design, it can be avoided that a single notch 110 deviates inward or outward from other notches 110, resulting in an oversize light guide plate.

[0070] Of course, the situation that the line connecting the ends of each notch 110 between the first light reflecting layer 111 and the second light reflecting layer 112 is inclined with the light emitting surface 11a of the light guide plate 100, resulting in the size of the light guide plate being too large, is also allowed. Figure 3 The structure shown may be a top view of the light guide plate 100 .

[0071] In some embodiments, the light emitting surface 11 a of the light guide plate is provided with a plurality of microstructures, and the plurality of microstructures may be dot structures, such as micro protrusions.

[0072] In this embodiment, the light output uniformity can be further improved by providing a plurality of microstructures (not shown).

[0073] The present application also provides a backlight module, comprising the light guide plate described in any of the above embodiments, a plurality of light sources and a first reflective sheet.

[0074] The light source is disposed at a first position point a, and the light source is an LED lamp, and the first reflective sheet is adhered to the bottom surface of the light guide plate 100 .

[0075] In this embodiment, part of the light incident on the bottom surface of the light guide plate 100 can be guided to the light emitting surface 11 a (not shown) of the light guide plate 100 through reflection by the first reflection sheet.

[0076] In some embodiments, the backlight module further includes: a second reflective sheet.

[0077] The second reflective sheet is laminated on a side of the light guide plate 100 away from the light incident side, and the second reflective sheet is connected to the first reflective sheet.

[0078] In this embodiment, part of the light incident on the side of the light guide plate 100 away from the light incident side can be guided to the light emitting surface 11 a (not shown) of the light guide plate 100 through reflection by the second reflective sheet.

[0079] The present application also provides a display device, comprising: a backlight module as described in any of the above embodiments.

[0080] 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, characterized in that, The light guide plate (100) has a light incident side and a light emitting surface (11a) intersecting with the light incident side. The light incident side is provided with notches (110) at intervals. The plurality of notches (110) divide the light incident side into a second light incident part (114) and a plurality of first light incident parts (113). One second light incident part (114) and the plurality of first light incident parts (113) are arranged in sequence on the light incident side. The first light incident part (113) and the second light incident part (114) are both wedge-shaped. Each first light incident part (113) includes a first light incident surface (1131) perpendicular to the light incident side and a first connection surface (1132) inclinedly connected to the first light incident surface (1131). The second light incident part (114) includes a second light incident surface (1141) inclinedly connected to the light incident side and a second connection surface (1142) coplanar with the light emitting surface (11a). Among every two adjacent first connection surfaces (1132), a first reflective layer (111) is plated on one of the first connection surfaces (1132), and a second reflective layer (112) is plated on the other first connection surface (1132). A first reflective layer (111) is plated on the second connection surface (1142). There is a first position point (a) for accommodating a light source between the first reflective layer (111) and the second reflective layer (112); wherein, the first position point (a) does not contact the light incident surface and the connection surface. The light emitted by the light source enters the light guide plate from the light incident surface. The first reflective layer (111) and the second reflective layer (112) are used to reflect the light entering from the light incident surface and then export it to the light emitting surface (11a), and the plurality of first reflective layers (111) and / or second reflective layers (112) are parallel to each other, so that the light emitted by each light source can be reflected multiple times by two parallel and opposite first reflective layers (111) or opposite first reflective layer (111) and second reflective layer (112) to pass through each corresponding light incident part multiple times.

2. The light guide plate according to claim 1, characterized in that, One end of the first reflective layer (111) facing away from the light emitting surface (11a) is below the first position point (a) corresponding to the first reflective layer (111); or one end of the second reflective layer (112) facing away from the light emitting surface (11a) is below the first position point (a) corresponding to the second reflective layer (112).

3. The light guide plate according to claim 1, characterized in that, The connection line between one end of the first reflective layer (111) facing away from the light emitting surface (11a) and one end of the second reflective layer (112) facing away from the light emitting surface (11a) is perpendicular to the light emitting surface (11a).

4. The light guide plate according to claim 1, characterized in that, The light emitting surface (11a) is provided with a plurality of microstructures.

5. The light guide plate according to any one of claims 1-4, characterized in that, The included angle between the connection line from the second position point (b) of the first reflective layer (111) to the first position point (a) and the first reflective layer (111) is α. The α included angle faces away from the light incident side, and the range of the α included angle is from 0° to 90°.

6. The light guide plate according to any one of claims 1-4, characterized in that, The included angle between the line connecting the third position point (c) of the second reflective layer (112) to the first position point (a) and the second reflective layer (112) is β. The β included angle faces away from the light incident side, and the range of the β included angle is from 0° to 90°.

7. A backlight module, characterized in that, Comprising: The light guide plate according to any one of claims 1-6; A plurality of light sources, the light sources are arranged at the first position point (a), and the light sources are not in contact with the light incident surface and the connection surface; a first reflective sheet, the first reflective sheet is adhesively arranged on the bottom surface of the light guide plate (100); A second reflective sheet, the second reflective sheet is adhesively arranged on the side of the light guide plate (100) facing away from the light incident side, the second reflective sheet is connected to the first reflective sheet, and the light emitted by each light source can be reflected multiple times by two adjacent first reflective layers (111) or an adjacent first reflective layer (111) and the second reflective layer (112).

8. A display device, characterized in that, Comprising: The backlight module according to claim 7.

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