Light guide plate, backlight module and display device

Abstract

A light guide plate (400), a backlight module (200) and a display device (100) are disclosed. The light guide plate (400) comprises a body (410) and a light-acting film (420). The body (410) has a light-in surface (411), a side surface (412) and an optical surface (413). The light-in surface (411) and the side surface (412) are connected to the optical surface (413) respectively. The light-acting film (420) is arranged on the side surface (412) of the body (410). The total reflectance of the light-acting film (420) is composed of a diffusion reflectance and a parallel reflectance. The percentage value of the parallel reflectance compared to the total reflectance is greater than 25 and less than 45, and includes the end point value. The backlight module (200) and the display device (100) comprise the light guide plate (400).

Description

[0001] This application claims priority to Chinese patent application No. 202111525938.1, filed on December 14, 2021, entitled "Light Guide Plate, Backlight Module and Display Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to a light guide element and its application, and particularly to a light guide plate and a backlight module and display device using the light guide plate. Background Technology

[0003] A conventional side-lit backlight module mainly comprises a light source and a light guide plate. The light guide plate has a light-incident side, a light-reflecting side, a light-emitting side, and a reflective side. The light-incident side is opposite to the light-reflecting side, and the reflective side is opposite to the light-emitting side, connecting the light-incident side and the light-reflecting side. Therefore, light from the light source enters the interior of the light guide plate from the light-incident side and is reflected within the light guide plate, exiting from the light-emitting side.

[0004] However, when some light rays travel to the incident light surface, they will exit from the incident light surface, resulting in light leakage or bright lines. Summary of the Invention

[0005] Therefore, the purpose of this disclosure is to provide a light guide plate, a backlight module and a display device, wherein the light guide plate can make full use of light and can improve the problems of light leakage or bright lines that exist in conventional light guide plates.

[0006] In accordance with the aforementioned objectives of this disclosure, a light guide plate is proposed. The light guide plate comprises a body and a light-acting film. The body has an incident surface, a side surface, and an optical surface. The incident surface and the side surface are respectively connected to the optical surface. The light-acting film is disposed on the side surface of the body. The total reflectivity of the light-acting film is composed of diffuse reflectivity and parallel reflectivity. The percentage of parallel reflectivity to total reflectivity is defined as R, where R is greater than 25, less than 45, and includes endpoint values.

[0007] According to one embodiment of this disclosure, the aforementioned body defines a plurality of light-emitting blocks arranged in a matrix. The ratio of the average brightness of the light-emitting blocks located on the two nearest opposite sides of the body to the brightness of the light-emitting block located at the center of the body is R. L R and R L It conforms to the following relationship:

[0008] 1>R L ≥7*10 -6 R 3 -0.0012R 2 +0.0582R-0.0015.

[0009] According to one embodiment of this disclosure, the above-mentioned R L The value is greater than 0.8 and less than 1.

[0010] According to one embodiment of this disclosure, the above-mentioned R L The value is greater than 0.845 and less than 0.875.

[0011] According to one embodiment of this disclosure, the ratio of diffuse reflectance to parallel reflectance of the aforementioned light-acting film is greater than 0.12 and less than 7.33, including the endpoint values. The thickness of the body is 0.7 mm or more and 1 mm or less, including the endpoint values.

[0012] According to one embodiment of the present disclosure, the ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is less than 1.875 and includes the endpoint values.

[0013] According to one embodiment of this disclosure, the ratio of diffuse reflectance to parallel reflectance of the aforementioned light-acting film is greater than 1.21 and less than 1.875, including the endpoint values. The thickness of the body is 1 mm or less, including the endpoint values.

[0014] According to one embodiment of this disclosure, the thickness of the body is 0.35 mm or more and 0.7 mm or less, including the endpoint values. The ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 1.3, including the endpoint values.

[0015] According to one embodiment of this disclosure, the ratio of diffuse reflectance to parallel reflectance of the aforementioned light-acting film is greater than 0.12 and less than 1.27, including the endpoint values. The thickness of the body is 0.7 mm or more and 1 mm or less, including the endpoint values.

[0016] According to one embodiment of the present disclosure, the ratio of the diffuse reflectance to the parallel reflectance of the light-acting film is greater than 1.1 and less than 1.27, including the endpoint value, and the thickness of the body is 0.55 mm or more and 1 mm or less, including the endpoint value.

[0017] According to one embodiment of this disclosure, the aforementioned photosensitive film directly contacts the side of the body.

[0018] In accordance with the aforementioned objectives of this disclosure, a backlight module is further proposed. The backlight module includes the aforementioned light guide plate, light source, and optical film. The light source is disposed adjacent to the light incident surface of the light guide plate. The optical film is disposed in front of the optical surface of the light guide plate.

[0019] In accordance with the aforementioned objectives of this disclosure, a display device is further proposed. The display device includes the aforementioned light guide plate, light source, optical film, and display panel. The light source is disposed adjacent to the light incident surface of the light guide plate. The optical film is disposed in front of the optical surface of the light guide plate. The display panel is disposed in front of the optical film.

[0020] As described above, this disclosure primarily involves setting a light-acting film on the side of the light guide plate. By setting this film on the side of the light guide plate and designing the percentage values ​​of parallel reflectance and total reflectance, the amount of light passing through the side of the light guide plate can be reduced, increasing the light utilization rate of the light guide plate and achieving a good effect in improving light leakage and bright lines. This, in turn, enhances the optical quality of the overall backlight module and display device. In other words, designing the percentage values ​​of parallel reflectance and total reflectance that are lower or higher than those disclosed in this disclosure will not achieve the desired effect in improving light leakage and bright lines. The light guide plate disclosed in this disclosure can improve upon the aforementioned objectives, thus better meeting the market's demand and expectations for narrow-bezel backlight modules. Attached Figure Description

[0021] To make the above and other objects, features, advantages and embodiments of this disclosure more apparent and understandable, the accompanying drawings are described below:

[0022] Figure 1 This is a schematic diagram illustrating a display device according to one embodiment of the present disclosure;

[0023] Figure 2 This is a schematic diagram illustrating the light path of diffuse reflection and parallel reflection that occur after light strikes the photosensitive film according to an embodiment of this disclosure; and

[0024] Figure 3 This is a graph showing the relationship between the reflectance ratio and the luminance ratio according to one embodiment of the present disclosure. Detailed Implementation

[0025] Please refer to Figure 1 This is a schematic diagram illustrating a display device according to one embodiment of the present disclosure. The display device 100 of this embodiment includes a backlight module 200 and a display panel 300 disposed in front of the backlight module 200. For example... Figure 1 As shown, the backlight module 200 includes a light source 210, a light guide plate 400, at least one optical film 220, a reflective sheet 230, and a back plate 240. The light source 210, reflective sheet 230, light guide plate 400, and optical film 220 are all housed within the back plate 240. The light source 210 is adjacent to the light guide plate 400 and primarily provides light to the light guide plate 400, forming a surface light source after passing through it. The reflective sheet 230 is located at the bottom of the light guide plate 400 to reflect light emitted from the bottom of the light guide plate 400 back into the light guide plate 400. In this embodiment, a light-reflecting film 420 is provided on the side of the light guide plate 400, a design that reduces light leakage from the light guide plate 400.

[0026] Specifically, such as Figure 1As shown, the light guide plate 400 includes a body 410 and a light-acting film 420. The body 410 of the light guide plate 400 has a light-incident surface 411, a side surface 412, and an optical surface 413. The light-incident surface 411 and the side surface 412 are respectively connected to the optical surface 413. In one embodiment, the optical surface 413 may be a light-emitting surface. In this embodiment, the light-acting film 420 is disposed on the side surface 412 to reflect light passing through the body 410. In this embodiment, the side surface 412 refers to the side surface of the body 410 with thickness, which may be a light-incident surface or other side surface including a light-incident surface, and is not used as a light-incident surface. In some embodiments, the light-acting film 420 directly contacts the side surface 412. In other embodiments, the light-acting film 420 is formed on the side surface 412 by adhesive application, coating, transfer printing, or vapor deposition. In this way, when the light provided by the light source 210 enters the interior of the light guide plate 400 and travels to the side 412, the light can be reflected back into the light guide plate 400 by the light-acting film 420 disposed on the side 412, so as to achieve the purpose of further utilizing the light.

[0027] In this embodiment, the light-acting film 420, due to its material properties, possesses total reflectivity, diffuse reflectivity, and parallel reflectivity, with the total reflectivity being the sum of diffuse reflectivity and parallel reflectivity. Please refer to [the relevant documentation / reference]. Figure 2 , Figure 2 This is a schematic diagram illustrating the light path of diffuse reflection and parallel reflection that occur after light strikes the light-acting film 420 according to an embodiment of this disclosure. Figure 2 As shown, when light ray L strikes the surface of the light-acting film 420, the light ray A1' reflected by the light-acting film 420 undergoes regular reflection, and the reflected light rays A1' are parallel to each other; however, when light ray L strikes the surface of the light-acting film 420, the light rays A2' reflected by the light-acting film 420 are not necessarily parallel to each other, but undergo irregular reflection along different directions.

[0028] In one embodiment, the thickness of the body 410 of the light guide plate 400 is less than 1 mm, including the endpoint values. In other embodiments, when the ratio of the diffuse reflectivity to the parallel reflectivity of the light-acting film 420 is less than 1, the thickness of the body 410 of the light guide plate 400 is greater than 0.35 mm.

[0029] Please also refer to Table 1 below, which compares the optical simulation results of various embodiments and comparative examples of this disclosure with light-acting films 420 using different reflectivity combinations. In Table 1, "〇" indicates that the luminance and optical quality of the portion of the light guide plate 400 near the edge meet the requirements and no defects occur; "△" indicates that the luminance and optical quality of the portion of the light guide plate 400 near the edge are slightly worse, but still meet the lower standard requirements; "X" indicates that the luminance and optical quality of the portion of the light guide plate 400 near the edge do not meet the requirements, such as the appearance of bright lines and dark halos.

[0030] Table 1

[0031]

[0032] As shown in Table 1, using the light-acting films of Examples 1 to 8, and with the body 410 having a thickness of less than 1 mm (including endpoint values), the resulting optical quality can meet the requirements under certain conditions. Specifically, the light-acting film 420 of Example 3 has a parallel reflectance of 24%–27% and a diffuse reflectance of 43%–46%, with a total reflectance of 70% and an R value of 34.29–38.57. The light-acting film 420 of Example 4 has a parallel reflectance of 27%–30% and a diffuse reflectance of 39%–42%, with a total reflectance of 69% and an R value of 39.13–43.48. The light-acting film 420 of Example 5 has a parallel reflectance of 35%–38% and a diffuse reflectance of 46%–49%, with a total reflectance of 84% and an R value of 41.67–45.24. In other words, in Examples 3 to 5, when the ratio of diffuse reflectance to parallel reflectance of the light-acting film 420 is greater than 1.21 and less than 1.875, by using light guide plates 400 of different thicknesses (e.g., light guide plates 400 with a thickness of less than 1 mm for the body 410), the problem of bright lines can be avoided. Or even when the ratio of diffuse reflectance to parallel reflectance is greater than 1.3, the light-acting film 420 can be applied to thinner light guide plates 400 (e.g., light guide plates 400 with a thickness of more than 0.35 mm and less than 0.7 mm), which can all make the light guide plate 400 produce better optical quality.

[0033] Regarding Embodiments 1 and 2, the ratio of diffuse reflectance to parallel reflectance of the light-acting film 420 in both Embodiments 1 and 2 is greater than 5, and the problem of bright and dark haloing only does not occur when the thickness of the body 410 is between 0.7 mm and 1 mm. Therefore, when the ratio of diffuse reflectance to parallel reflectance of the light-acting film 420 is greater than 5, it is suitable for use in thicker light guide plates 400. When the ratio of diffuse reflectance to parallel reflectance of the light-acting film 420 is designed to be less than 5, it is suitable for use in thinner light guide plates 400 to meet the requirements of different thicknesses of light guide plates 400.

[0034] Regarding Examples 6 to 8, when the ratio of diffuse reflectance to parallel reflectance of the light-acting film 420 is greater than 0.12 and less than 1.27, including the endpoint values, a body 410 with a thickness of 0.7 mm to 1 mm can be used. This reduces the likelihood of bright / dark halos and at least meets the requirements of a lower standard. Furthermore, when the thickness of the light guide plate 400 is greater than 0.7 mm, for example, 1 mm, the optical appearance can be further optimized. If the light-acting film 420 is further applied to a thinner backlight module, as shown in Example 6, the ratio of diffuse reflectance to parallel reflectance of the light-acting film 420 is further reduced to greater than 1.1 and less than 1.27, including the endpoint values. In this case, a light guide plate 400 with a thickness of more than 0.55 mm and less than 0.7 mm is used. Although the brightness and optical quality of the edge portion of the light guide plate 400 are slightly inferior, it still meets the requirements of a lower standard.

[0035] Regarding Comparative Example 1, since the total reflectivity of the light-acting film in Comparative Example 1 is too high, approaching the optical effect of specular reflection (generally referring to a total reflectivity exceeding 100%), problems such as bright edges will occur regardless of the thickness of the light guide plate 400. In other words, in Examples 1 to 8, when the ratio of diffuse reflectivity to parallel reflectivity of the light-acting film 420 is greater than 0.12 and less than 7.33, a light guide plate 400 with a thickness of 0.7 mm or more and less than 1 mm can produce better optical quality. Furthermore, considering Examples 1 and 2, if the light guide plate 400 is thinner, for example, to 0.7 mm, the ratio of diffuse reflectivity to parallel reflectivity of the light-acting film 420 needs to be less than 1.875 to achieve a better effect.

[0036] In addition to the above implementation description, in this embodiment, the percentage of parallel reflectance to total reflectance of the light-acting film 420 can also be defined as R. The relationship between R and parallel reflectance and total reflectance is as follows:

[0037] R(%) = ((RT-RD) / RT)*100. Where RT(%) is the total reflectance and RD(%) is the diffuse reflectance. In other words, assuming that the total reflectance consists of diffuse reflectance and parallel reflectance, the percentage value of RT-RD is the percentage value of parallel reflectance.

[0038] Please refer to Figure 1 The body 410 defines multiple light-emitting blocks 410b arranged in a matrix. The ratio of the average brightness of the two nearest opposing light-emitting blocks 410b on the body 410 to the brightness of the light-emitting block 410b located at the center of the body 410 is R. L R and RL The relationship is as follows:

[0039] 1>R L ≥7*10 -6 R 3 -0.0012R 2 +0.0582R-0.0015.

[0040] Please also refer to Table 2 below, which shows the different R and R values ​​of various embodiments and comparative examples disclosed herein. L The table below compares the optical simulation results produced by the light-acting film 420. In Table 2, "〇" indicates that the luminance and optical quality of the part of the light guide plate 400 near the edge meet the requirements and no defects occur; "△" indicates that the luminance and optical quality of the part of the light guide plate 400 near the edge are slightly worse, but still meet the lower standard requirements; "X" indicates that the luminance and optical quality of the part of the light guide plate 400 near the edge do not meet the requirements, such as the appearance of bright lines and dark halos.

[0041] Table 2

[0042]

[0043] As shown in Table 2, using the light-acting film 420 of Examples C to I, combined with a body 410 thickness of less than 0.55 mm including endpoint values, the resulting optical quality can meet requirements under certain conditions. Specifically, the R value of the light-acting film 420 of Example D is 34.29. L The value is 0.87. The R value of the light-acting film 420 in Example E is 39.13. L The value is 0.86. The value of R for the light-acting film 420 in Example F is 41.67. L The value is 0.85. That is, in Examples D to F, the value of R for the light-actuated film 420 is greater than 34.28 and less than 41.67. L The value is greater than 0.845 and less than 0.875. When paired with light guide plates 400 of different thicknesses (for example, light guide plates 400 with a body thickness of less than 0.55mm), the problem of bright lines can be avoided. It can even be applied to thinner light guide plates 400 of 0.35mm, so that the light guide plate 400 produces better optical quality.

[0044] Regarding Examples A and B, the R value of the photosensitive film 420 in both Examples A and B is less than 25. LThe values ​​are all less than 0.8. Regardless of whether the body 410 thickness is 0.55mm or 0.35mm, issues such as bright edges will occur. Therefore, to achieve better optical quality with the light guide plate 400, the R value of the light-acting film 420 needs to be designed to be greater than 25, or the R value needs to be... L The numerical design is greater than 0.8.

[0045] Regarding Example J, the value of R for the photosensitive film 420 in Example J is greater than 45. L When the R value is less than 0.8, regardless of whether the body 410 thickness is 0.55mm or 0.35mm, issues such as bright edges will occur. Therefore, to achieve better optical quality in the light guide plate 400, the R value of the light-acting film 420 needs to be designed to be less than 45, or the R value needs to be... L The numerical design is greater than 0.8.

[0046] Regarding Example C, the value of R for the photosensitive film 420 in Example C is 25. L The value is 0.81, slightly greater than 0.8. Combined with the body thickness of 410 being 0.55mm, this minimizes the issue of bright / dark halos. Therefore, when the R value of the light-acting film 420 is close to 25 and R... L When the value is slightly greater than 0.8, it is suitable for use in thicker light guide plates (400) and can produce the desired optical finish. Conversely, if R... L If the value is less than 0.845 and is applied to a thinner light guide plate 400, such as a body 410 with a thickness of 0.35mm, the optical quality will not meet the requirements.

[0047] Regarding Examples G, H, and I, the value of R for the light-actuated film 420 in Example G is 42.50. L The value is 0.84. The R value of the light-actuated film 420 in Example H is 44.05. L The value is 0.83. The R value of the photosensitive film 420 in Example G is 45.00. L The value is 0.83. In Examples G, H, and I, the value of R is greater than 42.50 and less than 45.00. L With a value less than 0.84, and considering the thickness of the body 410 is 0.55mm, the problem of bright and dark haloing is less likely to occur. Therefore, when the R of the light-acting film 420 is less than 0.84, the problem of bright and dark haloing is less likely to occur. LWhen the value is less than 0.84, it is suitable for use in thicker light guide plates 400 and can produce the desired optical quality. However, if it is applied to thinner light guide plates 400, such as when the body 410 is 0.35mm thick, due to R... L If the value does not reach 0.845, the optical quality is likely to fail to meet the requirements.

[0048] Regarding Comparative Example A, the value of R for the photosensitive film of Comparative Example A is 70, which is greater than 45, and R... L The value is 0.59, which is less than 0.8. Regardless of whether it is paired with a body 410 thickness of 0.55mm or 0.35mm, problems such as bright lines at the edges will occur.

[0049] See Table 2 for reference. Figure 3 ,in Figure 3 The horizontal axis represents the percentage (R) of the parallel reflectance of the light-acting film 420 relative to the total reflectance, and the vertical axis represents the ratio (R0) of the average brightness of the two nearest opposite light-emitting blocks 410b on the body 410 to the brightness of the light-emitting block 410b located in the center of the body 410. L When the R value of the selected photosensitive film 420 is greater than 25 and less than 45 and includes the endpoint values, or when the R value of the selected photosensitive film 420 is... L When the value of R is greater than 0.8 and less than 1, the region located at the top and above of the curve at least meets the requirements of a lower standard of optical quality. Preferably, the R value of the selected optical interaction film 420 is greater than 34.29 and less than 41.67, including the endpoint values. The R value of the selected optical interaction film 420... L The value is greater than 0.845 and less than 0.875. That is, the region located at or above the top of the curve has a better optimization effect. It is not only suitable for the thicker 0.55mm light guide plate 400 to meet the requirements of better optical quality, but can even be further applied to the thinner 0.35mm light guide plate 400.

[0050] In detail, when the R value of the photosensitive film 420 increases from 25 to 39.13, as the R value increases, R... L The value also increased from 0.81 to 0.87. When the R value of the photosensitive film 420 increased from 39.13 to 45, as the R value increased, R... L The value of R decreases from 0.87 to 0.83. Therefore, as the value of R continues to increase from 45, R... L The R value will continue to decrease and fall below 0.8, thus failing to improve defects such as bright lines and dark halos, and the optical quality will not meet requirements. Therefore, a higher R value for the optically active film 420 does not necessarily produce better optical quality. Conversely, as the R value continues to decrease from 25, R...L The R value will continue to decrease and fall below 0.8, thus failing to improve defects such as bright lines and dark halos, and the optical quality will not meet the requirements. Therefore, a smaller R value for the light-acting film 420 does not necessarily produce better optical quality. Thus, an R value greater than 45 or less than 25 will adversely affect the optical quality. Therefore, only those skilled in the art, based on the disclosure of this invention, can select the most suitable R value range for the light-acting film 420 to achieve a good effect in improving light leakage and bright lines.

[0051] As can be seen from the above embodiments, the advantage of this disclosure is that a light-acting film is provided on the side of the light guide plate. By providing this light-acting film on the side of the light guide plate, and combining it with the design of the percentage values ​​of parallel reflectivity and total reflectivity, the amount of light passing through the side of the light guide plate can be reduced, and the light utilization rate of the light guide plate can be increased. This achieves a good effect in improving light leakage and bright lines, thereby enhancing the overall optical quality of the backlight module and display device. In other words, if the percentage values ​​of parallel reflectivity and total reflectivity are less than or greater than those disclosed in this disclosure, the good effect of improving light leakage and bright lines cannot be achieved. The light guide plate disclosed in this disclosure can improve the aforementioned objectives, thus better meeting the market's demand and expectations for narrow-bezel backlight modules.

[0052] Although the embodiments disclosed herein have been described above, they are not intended to limit the scope of this disclosure. Anyone skilled in the art should be able to make some modifications and refinements without departing from the spirit and scope of the embodiments disclosed herein. Therefore, the protection scope of the embodiments disclosed herein should be determined by the scope defined in the appended claims.

[0053] [List of Labels in the Attached Image]

[0054] 100: Display device

[0055] 200: Backlight Module

[0056] 210: Light source

[0057] 220: Optical film

[0058] 230: Reflective sheet

[0059] 240: Backplate

[0060] 300: Display panel

[0061] 400: Light guide plate

[0062] 410:Ontology

[0063] 410b: Emitting Block

[0064] 411: Light-receiving surface

[0065] 412: Side view

[0066] 413: Optical surface

[0067] 420: Photosensitive film

[0068] L: Light

[0069] A1': Light

[0070] A2': Light.

Claims

1. A light guide plate, comprising: The body has a light-incident surface, a side surface, and an optical surface, wherein the light-incident surface and the side surface are respectively connected to the optical surface; as well as A light-acting film is disposed on the side surface of the body, wherein the total reflectivity of the light-acting film is composed of diffuse reflectivity and parallel reflectivity, and the percentage of parallel reflectivity to the total reflectivity is defined as R, wherein the value of R is greater than 25, less than 45, and includes endpoint values. The body defines multiple light-emitting blocks arranged in a matrix. The ratio of the average brightness of the two nearest opposite sides of the body to the brightness of the light-emitting block located at the center of the body is R. L The R and the R L It conforms to the following relationship: 1>R L ≧7*10 -6 R 3 -0.0012R 2 +0.0582R-0.0015。 2. The light guide plate according to claim 1, wherein R L The value is greater than 0.8 and less than 1.

3. The light guide plate according to claim 2, wherein R L The value is greater than 0.845 and less than 0.

875.

4. The light guide plate according to claim 1, wherein the ratio of the diffuse reflectivity to the parallel reflectivity of the light-acting film is greater than 0.12 and less than 7.33 and includes the endpoint value, and the thickness of the body is more than 0.7 mm and less than 1 mm and includes the endpoint value.

5. The light guide plate according to claim 4, wherein the ratio of the diffuse reflectivity to the parallel reflectivity of the light-acting film is less than 1.875 and includes endpoint values.

6. The light guide plate according to claim 1, wherein the ratio of the diffuse reflectivity to the parallel reflectivity of the light-acting film is greater than 1.21 and less than 1.875 and includes the endpoint value, and the thickness of the body is less than 1 mm and includes the endpoint value.

7. The light guide plate according to claim 6, wherein the thickness of the body is 0.35 mm or more and 0.7 mm or less and includes the endpoint value, and the ratio of the diffuse reflectivity to the parallel reflectivity of the light-acting film is greater than 1.3 and includes the endpoint value.

8. The light guide plate according to claim 1, wherein the ratio of the diffuse reflectivity to the parallel reflectivity of the light-acting film is greater than 0.12 and less than 1.27 and includes the endpoint value, and the thickness of the body is more than 0.7 mm and less than 1 mm and includes the endpoint value.

9. The light guide plate according to claim 1, wherein the ratio of the diffuse reflectivity to the parallel reflectivity of the light-acting film is greater than 1.1 and less than 1.27 and includes the endpoint value, and the thickness of the body is more than 0.55 mm and less than 1 mm and includes the endpoint value.

10. The light guide plate according to any one of claims 1 to 8, wherein the light-acting film directly contacts the side surface.

11. A backlight module, comprising: The light guide plate according to any one of claims 1 to 10; A light source, adjacent to the light incident surface of the light guide plate; and At least one optical film is disposed in front of the optical surface of the light guide plate.

12. A display device comprising: The light guide plate according to any one of claims 1 to 10; A light source, which is disposed adjacent to the light incident surface of the light guide plate; At least one optical film is disposed in front of the optical surface of the light guide plate; and A display panel is disposed in front of the at least one optical film.

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