Light guide plate, light source module and display device

Abstract

The application provides a light guide plate, which comprises a light guide layer and a first diffusion layer. The light guide layer comprises an adjacent light inlet surface and a light outlet surface; the first diffusion layer is connected to the light outlet surface, and the refractive index of the first diffusion layer is less than the refractive index of the light guide layer. The application also provides a light source module and a display device.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a light guide plate, a light source module including the light guide plate, and a display device including the light source module. Background Technology

[0002] Reflective displays (such as e-books) typically consist of a reflective layer, an e-ink layer (or liquid crystal layer), and a diffusion layer arranged sequentially. The diffusion layer has precisely designed optical dots printed on its surface; these dots are grooves or protrusions formed on the light-emitting surface of the diffusion layer. When ambient light enters the reflective display, it is reflected by the reflective layer. As the reflected light passes through the diffusion layer, it is modulated by the pre-distributed optical dots—dots of varying density and shape refract and scatter the reflected light at different locations, controlling the direction and intensity of the light before it exits the reflective display. Simultaneously, these dots, driven by pixel electrodes, form bright and dark patches on the e-ink layer (or liquid crystal layer), displaying text and images. However, this technology has a limitation: the density, shape, and distribution of the optical dots directly affect the transmittance and reflection uniformity of the light source module, leading to a decrease in display quality, such as uneven brightness or color shift. In addition, existing technologies for auxiliary lighting often employ a structure combining a side-emitting light source with a light guide plate, but this relies on the refraction and scattering of optical dots to control the light distribution, which can lead to uneven brightness distribution in the display. Summary of the Invention

[0003] In view of this, this application provides a light guide plate, a light source module, and a display device, which are beneficial to improving the uniformity of display brightness.

[0004] This application provides a light guide plate, including a light guide layer and a first diffusion layer. The light guide layer includes an adjacent light incident surface and a light emitting surface; the first diffusion layer is connected to the light emitting surface, and the refractive index of the first diffusion layer is less than the refractive index of the light guide layer.

[0005] In the light guide plate of this application, the refractive index of the first diffusion layer is less than that of the light guide layer. This helps to reduce the critical angle of total internal reflection at the incident interface when light is incident from the light guide layer to the first diffusion layer, enhances the coupling efficiency of light from the light guide layer to the diffusion layer, makes the light distribution closer to an ideal planar light source, significantly improves the brightness uniformity, effectively eliminates color shift and local overbrightness, thereby improving the uniformity of the display brightness of the display device.

[0006] In some embodiments, the first diffusion layer is formed with a plurality of first through holes spaced apart, and the light transmission of the plurality of first through holes is equal.

[0007] In some embodiments, the plurality of first through holes are of the same size and shape, and the distance between any two adjacent first through holes is equal.

[0008] In some embodiments, the light guide plate further includes a second diffusion layer connected to the side of the light guide layer away from the first diffusion layer, wherein the refractive index of the second diffusion layer is greater than the refractive index of the light guide layer.

[0009] In some embodiments, the second diffusion layer includes one or more second sub-diffusion layers. When there are multiple second sub-diffusion layers, the refractive index of the multiple second sub-diffusion layers increases sequentially in the direction away from the light guide layer in the thickness direction of the light guide plate.

[0010] In some embodiments, the light guide plate further includes a third diffusion layer connected to the side of the first diffusion layer away from the light guide layer, wherein the refractive index of the third diffusion layer is less than that of the first diffusion layer.

[0011] In some embodiments, the third diffusion layer includes one or more third sub-diffusion layers. When there are multiple third sub-diffusion layers, the refractive index of the multiple third sub-diffusion layers decreases sequentially in the direction away from the first diffusion layer in the thickness direction of the light guide plate.

[0012] In some embodiments, the first diffusion layer is provided with a plurality of second through holes at intervals. The plurality of second through holes are the same size and shape, and the distance between any two adjacent second through holes is equal. The plurality of second through holes are spaced apart from the plurality of first through holes. The third sub-diffusion layer adjacent to the first diffusion layer is provided with a plurality of third through holes at intervals. The plurality of third through holes are the same size and shape, and the distance between any two adjacent third through holes is equal. The orthographic projection of each third through hole onto the first diffusion layer completely covers one of the second through holes, and the orthographic projection of each third through hole onto the first diffusion layer is spaced apart from the first through hole.

[0013] In some embodiments, the second diffusion layer and the third diffusion layer are made of transparent optical adhesive, the first diffusion layer is made of polymethyl methacrylate, and the light guide layer is made of polycarbonate.

[0014] A second aspect of this application provides a light source module, comprising: a light guide plate and a light source as described in any of the preceding claims. The light source is located on the light incident surface of the light guide layer and is used to emit light rays onto the light incident surface, allowing the light rays to enter the light guide layer.

[0015] The light source module described above integrates the light guide plate, thus achieving all the beneficial effects of the light guide plate.

[0016] A third aspect of this application provides a display device, including a light source module and a display module as described above. The light source module is used to emit light; the display module is stacked on top of the light source module, the display module is used to receive the light and modulate the brightness of the light, and the display module is also used to reflect the modulated light back to the light source module, so that the modulated light passes through the light source module and is emitted.

[0017] The aforementioned display device integrates the aforementioned light source module, thus achieving all the beneficial effects of the aforementioned light source module. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the display device according to an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the planar structure of the light source module according to an embodiment of this application.

[0020] Figure 3 This is a cross-sectional structural diagram of a light guide plate according to an embodiment of this application.

[0021] Figure 4 This is a cross-sectional structural diagram of a light guide plate according to another embodiment of this application.

[0022] Figure 5 This is a cross-sectional structural diagram of a light guide plate according to another embodiment of this application.

[0023] Figure 6 This is a cross-sectional structural diagram of a light guide plate according to another embodiment of this application.

[0024] Figure 7 This is a partial optical path diagram when ambient light directly enters the light guide layer.

[0025] Figure 8 This is a partial optical path diagram of ambient light passing through the first diffusion layer and entering the light guide layer.

[0026] Explanation of main component symbols: display device 1, light source module 100, light guide plate 10, light-incident side 10a, light-outceasing side 10b, light guide layer 11, first groove 111, second groove 112, light-incident surface 11a, light-outceasing surface 11b, first diffusion layer 12, first through hole 121, second through hole 122, second diffusion layer 13, second sub-diffusion layer 131, third diffusion layer 14, third through hole 141, third sub-diffusion layer 142, light source 30, display module 200.

[0027] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0029] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application's specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] To further illustrate the technical means and effects adopted by this application in achieving its intended purpose, the following detailed description of this application is provided in conjunction with the accompanying drawings and preferred embodiments.

[0031] Please see Figure 1 The display device 1 of this application embodiment includes a light source module 100 and a display module 200 stacked together. The light source module 100 is used to supplement illumination when the ambient light is insufficient, thereby improving the display effect of the display device 1 in low-light environments. A display surface is formed on the side of the display module 200 near the light source module 100, and the light source module 100 is stacked on top of the display surface of the display module 200. The light source module 100 is used to emit light toward the display module 200. The display module 200 includes a reflective layer, a first transparent electrode layer, a liquid crystal layer, a second transparent electrode layer, and a polarizer stacked sequentially, with the light source module 100 disposed on the side of the polarizer away from the second transparent electrode. After receiving light emitted from the light source module 100, the display module 200 allows the light to pass sequentially through a polarizer, a second transparent electrode, a liquid crystal layer, and a first transparent electrode layer to reach the reflective layer. After being reflected by the reflective layer, the light then passes sequentially through the first transparent electrode, the liquid crystal layer, the second transparent electrode layer, and the polarizer before exiting onto the light guide plate 10 in the light source module 100, thus displaying an image. By creating a potential difference between the first and second transparent electrode layers and changing the magnitude of this potential difference, the arrangement of liquid crystal molecules within the liquid crystal layer is altered, thereby controlling the intensity of the light. The polarizer is used to filter out stray light and ensure image contrast. In other embodiments, the display module 200 includes a reflective layer, a first transparent electrode layer, an electronic ink layer, a second transparent electrode layer, and a polarizer stacked sequentially. By creating a potential difference between the first and second transparent electrode layers and changing the magnitude of the potential difference, the black and white (color) pigment particles with different charges in the microcapsules of the electronic ink layer are driven to move to a designated position, thereby achieving the control of the intensity of light and making the display device 1 display images with different brightness and darkness.

[0032] Please refer to the following: Figure 2 and Figure 3The light source module 100 of this application embodiment includes a light guide plate 10 and a light source 30. The light guide plate 10 includes a light guide layer 11 and a first diffusion layer 12 stacked sequentially. The light guide layer 11 includes an adjacent light incident surface 11a and a light emitting surface 11b. The first diffusion layer 12 is in direct contact with the light guide layer 11 and is connected to the light emitting surface 11b. The light source module 100 is a side-lit light source module, and the light guide plate 10 includes an adjacent light incident side 10a and a light emitting side 10b. The light incident surface 11a of the light guide layer 11 is located on the light incident side 10a, and the light emitting surface 11b of the light guide layer 11 is located on the light emitting side 10b. The light source 30 is located on the light incident side 10a, that is, on the light incident surface 11a of the light guide layer 11. The light source 30 is used to emit light onto the light incident surface 11a, so that the light passes through the light incident surface 11a and enters the light guide layer 11. The first diffusion layer 12 is made of a first transparent material, and the light guide layer 11 is made of a second transparent material, allowing light to pass through the light guide plate 10 and exit to the display device 1 to display an image. The first diffusion layer 12 and the light guide layer 11 are also used to receive and transmit ambient light, allowing ambient light to enter the display module 200. The refractive index of the second transparent material is lower than that of the first transparent material, making the refractive index of the first diffusion layer 12 lower than that of the light guide layer 11. This helps to reduce the critical angle of total internal reflection at the incident interface when light enters the first diffusion layer 12 from the light guide layer 11, enhances the coupling efficiency of light from the light guide layer 11 to the diffusion layer, makes the light distribution closer to an ideal planar light source, significantly improves brightness uniformity, and effectively eliminates color shift and local overbrightness.

[0033] In some embodiments, the first diffusion layer 12 is formed with a plurality of first through holes 121 at intervals, such that a portion of the light-emitting surface 11b of the light guide layer 11 corresponding to the first through holes 121 is exposed to air. A portion of the light transmitted within the light guide layer 11 can directly escape from this portion of the light guide plate 10, which helps reduce light loss. The light transmission capacity of the plurality of first through holes 121 is equal; even a 3% deviation in the light transmission capacity between two first through holes 121 is considered as equal light transmission capacity. In some embodiments, the plurality of first through holes 121 are of the same size and shape, and the distance between any two adjacent first through holes 121 is equal, allowing light to escape uniformly from the plurality of first through holes 121 from the light guide plate 10, which helps improve the brightness uniformity of the light emitted from the light guide plate 10.

[0034] In some embodiments, the light guide layer 11 is made of polycarbonate (PC). PC has a low water absorption rate, which allows the light guide plate 10 to maintain structural rigidity and flatness even when exposed to humid, high-temperature, or large temperature difference environments for a long time, without the need for additional dehumidification treatment or stress relief processes, significantly improving the service life of the light guide plate 10. The first diffusion layer 12 is made of polymethyl methacrylate (PMMA), which has high light transmittance, which is beneficial for light to pass through the first diffusion layer 12 without scattering and causing light loss.

[0035] In some embodiments, molten PC and molten PMMA are extruded into a mold for making the light guide plate 10 using two independent extruders, thereby producing a light guide plate 10 comprising a two-layer structure of a light guide layer 11 and a first diffusion layer 12. The molten PC solidifies to form the light guide layer 11, and the molten PMMA solidifies to form the first diffusion layer 12.

[0036] Please see Figure 4 In some embodiments, the light guide plate 10 further includes a second diffusion layer 13 connected to the side of the light guide layer 11 away from the first diffusion layer 12. The refractive index of the second diffusion layer 13 is greater than that of the light guide layer 11, causing an increase in the refraction angle at the interface when light enters the second diffusion layer 13 from the light guide layer 11. This allows some of the light that might have undergone total internal reflection within the light guide layer 11 to pass through the second diffusion layer 13 and exit the light guide plate 10, and then be incident on the display module 200. That is, the second diffusion layer 13 is a refractive index transition layer, which can release some of the light that would have been transmitted by total internal reflection within the light guide layer 11 and transmit it to the display module 200, thereby improving the light energy utilization rate.

[0037] Please see Figure 6 In some embodiments, the second diffusion layer 13 includes one or more second sub-diffuse layers 131. When there are multiple second sub-diffuse layers 131, the refractive index of the multiple second sub-diffuse layers 131 increases sequentially in the thickness direction of the light guide plate 10 away from the light guide layer 11. Stacking multiple layers of second sub-diffuse layers 131 on the side of the light guide layer 11 away from the first diffusion layer 12, that is, stacking multiple refractive index transition layers on the side of the light guide layer 11 away from the first diffusion layer 12, can increase the amount of light emitted by the light guide layer 11 and transmit it to the display module 200, further improving light energy utilization.

[0038] Please refer to the following: Figure 4In some embodiments, the light guide plate 10 further includes a third diffusion layer 14 connected to the side of the first diffusion layer 12 away from the light guide layer 11, and the third diffusion layer 14 fills within a plurality of first through holes 121. The refractive index of the third diffusion layer 14 is lower than that of the first diffusion layer 12. By providing a third diffusion layer 14 on the side of the first diffusion layer 12 away from the light guide layer 11, a low-refractive-index transition layer is introduced between the first diffusion layer 12 and the air. This helps reduce the possibility of total internal reflection when light exits the first diffusion layer 12, thereby enhancing the brightness of the light emitted from the light guide plate 10 without increasing power consumption.

[0039] Please refer to the following: Figure 3 and Figure 4 In some embodiments, a plurality of first grooves 111 are formed at intervals on the surface of the light guide layer 11 near the first diffusion layer 12. The orthographic projection of each first through hole 121 onto the light guide layer 11 completely covers a first groove 111. The third diffusion layer 14 fills the plurality of first grooves 111, so that ambient light can pass through the third diffusion layer 14 and directly enter the light guide layer 11, which helps to reduce ambient light loss and improve light energy utilization.

[0040] Please refer to the following: Figure 5 and Figure 6 In some embodiments, the third diffusion layer 14 includes one or more third sub-diffusion layers 142. When there are multiple third sub-diffusion layers 142, the refractive index of the multiple third sub-diffusion layers 142 decreases sequentially in the direction away from the first diffusion layer 12 in the thickness direction of the light guide plate 10.

[0041] The first diffusion layer 12 has a plurality of second through holes 122 spaced apart. The plurality of second through holes 122 are identical in size and shape, and the distance between any two adjacent second through holes 122 is equal. The plurality of second through holes 122 are spaced apart from the plurality of first through holes 121. The third sub-diffusion layer 142 adjacent to the first diffusion layer 12 has a plurality of third through holes 141 spaced apart. The plurality of third through holes 141 are identical in size and shape, and the distance between any two adjacent third through holes 141 is equal. The orthographic projection of each third through hole 141 onto the first diffusion layer 12 completely covers one of the second through holes 122, and the orthographic projection of each third through hole 141 onto the first diffusion layer 12 is spaced apart from the first through hole 121.

[0042] In the direction perpendicular to the thickness of the light guide plate 10, the shapes of the areas enclosed by the outer contours of the first through hole 121, the second through hole 122, and the third through hole 141 can be the same or different. For example, in the direction perpendicular to the thickness of the light guide plate 10, the first through hole 121, the second through hole 122, and the third through hole 141 can all be circular, or the first through hole 121 can be circular, and the second through hole 122 and the third through hole 141 can both be rectangular.

[0043] In some embodiments, the second diffusion layer 13 and the third diffusion layer 14 are both made of transparent optical adhesive. The thickness of the first diffusion layer 12, the second diffusion layer 13, and the third diffusion layer 14 all ranges from 50 μm to 100 μm, including the endpoint values.

[0044] Please refer to the following: Figure 5 and Figure 6 In some embodiments, a plurality of second grooves 112 are formed at intervals on the surface of the light guide layer 11 near the first diffusion layer 12. The orthographic projection of each second through hole 122 onto the light guide layer 11 completely covers a second groove 112. The fourth diffusion layer 15 fills the plurality of second through holes 122, the plurality of third through holes 141 and the plurality of second grooves 112, so that ambient light can pass through the fourth diffusion layer 15 and directly enter the light guide layer 11, which helps to reduce ambient light loss and improve light energy utilization.

[0045] Please see Figure 6 In some embodiments, the second diffusion layer 13 includes two second sub-diffusion layers 131. As light passes through the two second sub-diffusion layers 131 sequentially from the light guide layer 11, the light is deflected towards the direction closer to the normal, so that the light can be incident on the surface of the display module 200 at a near-vertical angle. This is beneficial to improve the brightness of the center of the screen and the consistency of the viewing angle of the display device 1, and reduce the dark area at the edge.

[0046] The third diffusion layer 14 includes two third sub-diffusive layers 142, which is equivalent to introducing two low-refractive-index transition layers between the first diffusion layer 12 and the air. This further reduces the possibility of total internal reflection when light exits the first diffusion layer 12, thereby enhancing the brightness of the light emitted from the light guide plate 10 without increasing power consumption. Furthermore, the refractive index of the fourth diffusion layer 15 is less than that of the third diffusion layer 14, and the refractive index of the third diffusion layer 14 is less than that of the first diffusion layer 12. When ambient light passes through the fourth diffusion layer 15, the third diffusion layer 14, and the first diffusion layer 12 sequentially into the light guide layer 11, the light will be deflected towards the normal direction, which helps to increase the amount of ambient light entering the light guide layer 11, that is, to improve the coupling efficiency of the light guide plate 10 to ambient light.

[0047] This application does not limit the number of the second sub-diffuse layer 131 and the third sub-diffuse layer 142. This application can stack multiple additional diffuser layers with different refractive indices on the basis of the light guide layer 11 and the first diffuser layer 12. Each additional diffuser layer is stacked according to the refractive index gradient design. For example, the refractive index of the additional diffuser layers stacked upward from the first diffuser layer 12 decreases sequentially, and the refractive index of the additional diffuser layers stacked downward from the light guide layer 11 increases sequentially.

[0048] In the light guide plate 10 of this application embodiment, the refractive index of the first diffusion layer 12 is less than that of the light guide layer 11. This is beneficial for reducing the critical angle of total internal reflection at the incident interface when light is incident from the light guide layer 11 to the first diffusion layer 12, enhancing the coupling efficiency of light from the light guide layer 11 to the diffusion layer, making the light distribution closer to an ideal planar light source, significantly improving brightness uniformity, effectively eliminating color shift and local overbrightness, thereby improving the uniformity of the display brightness of the display device 1. The first diffusion layer 12 has a plurality of first through holes 121 spaced apart, and the plurality of first through holes 121 are the same size and shape. The distance between any two adjacent first through holes 121 is equal, that is, the plurality of first through holes 121 are uniformly distributed on the first diffusion layer 12 and are the same size and shape. The light incident surface 11a of the light guide layer 11 is used to receive light, allowing the light to enter the light guide layer 11. When light entering the light guide layer 11 propagates through the light guide layer 11 and exits from the light emitting surface 11b to the outside of the light guide plate 10, the multiple first through holes 121 are evenly distributed on the first diffusion layer 12 and are of equal size and shape. This allows the light to exit the light guide plate 10 uniformly from the multiple first through holes 121, which helps to improve the brightness uniformity of the light emitted from the light guide plate 10, thereby improving the display uniformity of the display device 1 using the light guide plate 10. Furthermore, compared to the light loss caused by light passing through the first diffusion layer 12 and exiting the light guide plate 10, some of the light propagated inside the light guide plate 10 exits the light guide plate 10 directly through the multiple through holes, which helps to reduce light loss and improve light energy utilization efficiency.

[0049] Please refer to the following: Figure 7 and Figure 8 , Figure 7 This represents a local optical path diagram when ambient light directly enters the light guide layer 11. Figure 8 This represents a local optical path diagram showing how ambient light sequentially passes through the first diffusion layer 12 and enters the light guide layer 11. Combined with... Figure 7 and Figure 8As can be seen, compared to ambient light directly entering the light guide layer 11, by setting a first diffusion layer 12 on the light guide layer 11, the light entering the light guide layer 11 can be deflected towards the direction closer to the normal, thereby allowing more ambient light to enter the light guide layer 11 and improving the display brightness of the display device 1. Furthermore, the light guide plate 10 of this embodiment also sets a third diffusion layer 14 (including multiple third sub-diffusion layers 142 with successively decreasing refractive indices in the direction away from the light guide layer 11) on the side of the first diffusion layer 12 away from the light guide layer 11, and sets a second diffusion layer 13 (including multiple second sub-diffusion layers 131 with successively increasing refractive indices in the direction away from the light guide layer 11) on the side of the light guide layer 11 away from the first diffusion layer 12, so that ambient light can pass through the multiple third diffusion layers 14, the first diffusion layer 12, the light guide layer 11, and the second diffusion layer 13 in sequence and be incident on the surface of the display module 200 at a near-vertical angle, thereby improving the brightness and viewing angle consistency of the screen center of the display device 1 and reducing dark areas at the edges. Those skilled in the art should recognize that the above embodiments are only used to illustrate this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of protection claimed in this application.

Claims

1. A light guide plate, characterized in that, include: The light guide layer includes an adjacent light-incident surface and a light-outceasing surface; as well as A first diffusion layer is attached to the light-emitting surface, and the refractive index of the first diffusion layer is less than the refractive index of the light-guiding layer.

2. The light guide plate as described in claim 1, characterized in that, The first diffusion layer has a plurality of first through holes spaced apart, and the light transmission of the plurality of first through holes is equal.

3. The light guide plate as described in claim 2, characterized in that, The plurality of first through holes are the same size and shape, and the distance between any two adjacent first through holes is equal.

4. The light guide plate as described in claim 1, characterized in that, The light guide plate further includes a second diffusion layer connected to the side of the light guide layer away from the first diffusion layer, and the refractive index of the second diffusion layer is greater than the refractive index of the light guide layer.

5. The light guide plate as described in claim 4, characterized in that, The second diffusion layer includes one or more second sub-diffusion layers. When there are multiple second sub-diffusion layers, the refractive index of the multiple second sub-diffusion layers increases sequentially in the direction away from the light guide layer in the thickness direction of the light guide plate.

6. The light guide plate as described in claim 4, characterized in that, The light guide plate further includes a third diffusion layer connected to the side of the first diffusion layer away from the light guide layer, and the refractive index of the third diffusion layer is less than that of the first diffusion layer.

7. The light guide plate as described in claim 6, characterized in that, The third diffusion layer includes one or more third sub-diffusion layers. When there are multiple third sub-diffusion layers, the refractive index of the multiple third sub-diffusion layers decreases sequentially in the direction away from the first diffusion layer in the thickness direction of the light guide plate.

8. The light guide plate as described in claim 6, characterized in that, The first diffusion layer has a plurality of second through holes spaced apart. The plurality of second through holes are the same size and shape, and the distance between any two adjacent second through holes is equal. The plurality of second through holes are spaced apart from the plurality of first through holes. The third sub-diffusion layer adjacent to the first diffusion layer is formed with a plurality of third through holes at intervals. The plurality of third through holes are the same size and shape, and the distance between each pair of adjacent third through holes is equal. The orthographic projection of each third through hole onto the first diffusion layer completely covers a second through hole, and the orthographic projection of each third through hole onto the first diffusion layer is spaced apart from the first through hole.

9. The light guide plate as described in claim 6, characterized in that, The second diffusion layer and the third diffusion layer are both made of transparent optical adhesive, the first diffusion layer is made of polymethyl methacrylate, and the light guide layer is made of polycarbonate.

10. A light source module, characterized in that, include: The light guide plate as described in any one of claims 1 to 9; A light source, located on the light-incident surface of the light guide layer, is used to emit light rays onto the light-incident surface so that the light rays enter the light guide layer.

11. A display device, characterized in that, include: The light source module as described in claim 10 is used to emit light; The display module is stacked on top of the light source module. The display module is used to receive the light and reflect the light back to the light guide plate in the light source module, so that the light passes through the light guide plate and is emitted.

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