Light guide plate assembly, backlight module and display device

Abstract

This invention provides a light guide plate assembly, a backlight module, and a display device, relating to the field of display technology, for improving the uniformity of light emission at different locations in a backlight module. The light guide plate assembly includes a reflective portion with an opening; a transmissive portion, at least a portion of which is located within the opening; the transmissive portion includes a converging portion and a diverging portion; the converging portion is used to converge light entering the converging portion towards a side away from the center of the opening, and the diverging portion is used to diverge light entering the diverging portion towards a side away from the center of the opening; the converging portion is located on the side of the transmissive portion away from the center of the opening.

Description

[Technical Field]

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

[0002] With the development of display technology, flat panel display devices such as liquid crystal display (LCD) panels have become the mainstream display devices due to their advantages such as high quality, energy saving and wide range of applications, and are widely used in various electronic products such as mobile phones, televisions, digital cameras, and laptops.

[0003] Since LCD panels do not emit light themselves, they need to be used in conjunction with backlight modules. Current backlight modules suffer from uneven light output brightness. [Summary of the Invention]

[0004] In view of this, embodiments of the present invention provide a light guide plate assembly, a backlight module, and a display device to solve the problem of uneven brightness in the prior art.

[0005] In one aspect, embodiments of the present invention provide a light guide plate assembly, comprising:

[0006] The reflective part has an opening;

[0007] The transmissive portion, at least part of which is located within the opening, includes a converging portion and a diverging portion. The converging portion is used to converge light entering the converging portion toward a side away from the center of the opening, and the diverging portion is used to diverge light entering the diverging portion toward a side away from the center of the opening. The converging portion is located on the side of the transmissive portion away from the center of the opening.

[0008] On the other hand, embodiments of the present invention also provide a light guide plate assembly, comprising:

[0009] The reflective part has an opening;

[0010] The transmissive portion, at least a portion of which is located within the opening, includes a converging portion and a diverging portion.

[0011] The curvature of the surface of the converging part near the light-incident side of the light guide plate assembly is greater than or equal to 0;

[0012] The curvature of the surface of the diverging part near the light-incident side of the light guide plate assembly is less than or equal to 0.

[0013] In another aspect, embodiments of the present invention provide a backlight module, including a light-emitting element and the aforementioned light guide plate assembly, wherein the light guide plate assembly is located on the light-emitting side of the light-emitting element.

[0014] In another aspect, embodiments of the present invention provide a display device, including a display panel and the aforementioned backlight module, wherein the display panel is located on the light-emitting side of the backlight module.

[0015] The light guide plate assembly, backlight module, and display device provided in this invention, by configuring the light guide plate assembly to include a transmissive portion and a reflective portion, and configuring the reflective portion to include an opening, with at least a portion of the transmissive portion located within the opening, allows the light-emitting element to be disposed within the opening when the light guide plate assembly is applied to the backlight module. This configuration allows small-angle light emitted by the light-emitting element to exit through the transmissive portion corresponding to the opening, and large-angle light emitted by the light-emitting element to be reflected by the reflective portion, with the reflected light exiting through the transmissive portion corresponding to the reflective surface. This avoids large-angle light from hitting the locations of other light-emitting elements, thereby preventing crosstalk between light emitted by different light-emitting elements. Furthermore, this configuration increases the light intensity emitted from the non-opening area of ​​the reflective portion in the light guide plate assembly, which is beneficial for improving the uniformity of light intensity emitted from different areas in the light guide plate assembly.

[0016] In addition, this embodiment of the invention configures the transmissive portion to include a diverging portion and a converging portion. The diverging portion 1 can cause the light entering the diverging portion to diverge to a side away from the center of the opening H, and the converging portion can cause the light entering the converging portion to converge to a side away from the center of the opening H. Based on this configuration, when the light guide plate assembly is applied to the backlight module, the intensity of the light emitted from the area near the edge of the opening of the reflective portion in the light guide plate assembly can be further improved. This balances the intensity of the light emitted from different locations, such as the area in the opening where the light-emitting element is provided (e.g., the center of the opening) and the area where no light-emitting element is provided (e.g., the edge of the opening). This can eliminate the problem of visible mesh caused by uneven light intensity and is beneficial to improving the display effect of the display device including the light guide plate assembly.

[0017] Moreover, based on the configuration provided in the embodiments of the present invention, the problem of visible mesh can be eliminated without setting a diffuser plate in the light guide plate assembly, which is beneficial to reduce the cost of the light guide plate assembly and reduce the thickness of the light guide plate assembly. [Attached Image Description]

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A three-dimensional schematic diagram of a light guide plate assembly provided in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of a cross section along AA';

[0021] Figure 3 This is a cross-sectional schematic diagram of a backlight module provided in an embodiment of the present invention;

[0022] Figure 4 An enlarged schematic diagram of a light guide plate unit provided in an embodiment of the present invention;

[0023] Figure 5 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0024] Figure 6 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0025] Figure 7 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0026] Figure 8 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0027] Figure 9 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0028] Figure 10 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0029] Figure 11 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram of the stacking of a backlight module provided in an embodiment of the present invention;

[0031] Figure 13 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0032] Figure 14 This is a schematic diagram illustrating the principle of the position setting of the third microstructure in a light guide plate unit according to an embodiment of the present invention;

[0033] Figure 15 A cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention;

[0034] Figure 16 This is a schematic diagram of a display device provided in an embodiment of the present invention.

Detailed Implementation Methods

[0035] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0039] This invention provides a light guide plate assembly, such as... Figure 1 As shown, Figure 1 This is a three-dimensional schematic diagram of a light guide plate assembly 1 provided in an embodiment of the present invention. The light-incident side 101 and the light-exit side 102 of the light guide plate assembly 1 are arranged opposite to each other along the thickness direction h1 of the light guide plate assembly 1. The light guide plate assembly 1 can conduct the light emitted by the light-emitting element, so that the light emitted by the light-emitting element enters through the light-incident side 101 of the light guide plate assembly 1 and exits through the light-exit side 102 of the light guide plate assembly 1. Figure 1 The arrow passing through the light guide plate assembly 1 is used to indicate the direction of light propagation through the light guide plate assembly 1. When the light guide plate assembly 1 is combined with the light-emitting element to form a backlight module, the light-emitting element can be positioned close to the light-incident side 101 of the light guide plate assembly 1.

[0040] Combination Figure 1 and Figure 2 As shown, Figure 2 for Figure 1 A cross-sectional schematic diagram along AA' shows that the light guide plate assembly 1 includes multiple light guide plate units 10, which are arranged in an array in a direction parallel to the plane of the light guide plate assembly 1. For example... Figure 1 As shown, the first direction h21 and the second direction h22 intersect to define the plane where the light guide plate assembly 1 is located.

[0041] like Figure 1 and Figure 2As shown, the light guide plate unit 10 includes a light-emitting element setting area A1. The light-emitting element setting area A1 is used to set the light-emitting elements. For example, when the light guide plate assembly 1 is combined with a backlight to form a backlight module, this embodiment of the invention can arrange the light-emitting elements in the backlight and the light guide plate unit in a one-to-one correspondence. Combined with... Figure 3 As shown, Figure 3 This is a cross-sectional schematic diagram of a backlight module 100 provided in an embodiment of the present invention, wherein the light-emitting element 30 is located in the light-emitting element setting area A1.

[0042] like Figure 2 and Figure 3 As shown, the light guide plate unit 10 also includes a reflective portion 11 and a transmissive portion 12. The reflective portion 11 is used to reflect the light-emitting element (…). Figure 2 The light emitted by the light-emitting element (not shown) is reflected. The transmission section 12 is used to transmit light through the light-emitting element (…). Figure 2 The light emitted (not shown). The reflectivity of the reflective part 11 is greater than that of the transmissive part 12. The transmissivity of the transmissive part 12 is greater than that of the reflective part 11.

[0043] In embodiments of the present invention, such as Figure 2 and Figure 3 As shown, the reflective portion 11 has an opening H. At least a portion of the transmissive portion 12 is located within the opening H. The light-emitting element mounting area A1 is located within the opening H. Figure 3 As shown, when the light guide plate assembly 1 is used in the backlight module 100, the light-emitting element 30 in the backlight module 100 can be disposed in the opening H.

[0044] like Figure 2 and Figure 3 As shown, the transmission section 12 includes a diverging section 121 and a converging section 122; the diverging section 121 is used to disperse light entering the diverging section 121 towards a side away from the center of the opening H; the converging section 122 is used to converge light entering the converging section 122 towards a side away from the center of the opening H. For example, the converging section 122 can converge light entering the converging section 122 towards a side near the edge S of the opening H. Here, the edge S of the opening H refers to the edge of the opening H near the light-emitting side 102 of the light guide plate assembly 1.

[0045] When the backlight module 100 is lit, combined with Figure 3 and Figure 4 As shown, Figure 4This is an enlarged schematic diagram of a light guide plate unit provided in an embodiment of the present invention. The light emitted by the light-emitting element 30 is refracted when it passes through the converging portion 122, and the outgoing light is deflected relative to the incident light in a direction closer to the edge S of the opening H. That is, multiple beams of light passing through the converging portion 122 can converge at a position close to the edge S of the opening H. The light emitted by the light-emitting element 30 is refracted when it passes through the diverging portion 121, and the outgoing light is deflected relative to the incident light in a direction away from the center of the opening H. That is, multiple beams of light passing through the diverging portion 121 can diverge in a direction away from the center of the opening H.

[0046] The light guide plate assembly 1 provided in this embodiment of the invention includes a transmissive portion 12 and a reflective portion 11, with the reflective portion 11 including an opening H. At least a portion of the transmissive portion 12 is located within the opening H. When the light guide plate assembly 1 is applied to a backlight module, the light-emitting element can also be placed within the opening H. This arrangement allows small-angle light emitted by the light-emitting element to exit through the transmissive portion 12 corresponding to the opening H, and large-angle light emitted by the light-emitting element to be reflected by the reflective portion 11, with the reflected light exiting through the transmissive portion corresponding to the reflective surface. This prevents large-angle light from hitting the locations of other light-emitting elements, thereby avoiding crosstalk between light emitted by different light-emitting elements. Furthermore, this arrangement increases the intensity of light emitted from the non-opening area of ​​the reflective portion in the light guide plate assembly, which is beneficial for improving the uniformity of light intensity emitted from different areas in the light guide plate assembly.

[0047] In addition, in this embodiment of the invention, the transmissive portion 12 is configured to include a diverging portion 121 and a converging portion 122. The diverging portion 121 can cause the light entering the diverging portion 121 to diverge to the side away from the center of the opening H, and the converging portion 122 can cause the light entering the converging portion 122 to converge to the side away from the center of the opening H. Based on this configuration, when the light guide plate assembly 1 is applied to the backlight module, the intensity of the light emitted from the area near the edge S of the opening of the reflective portion 11 in the light guide plate assembly 1 can be further improved. This balances the intensity of the light emitted from different positions in the opening H, such as the area where the light-emitting element is provided (e.g., the center of the opening) and the area where no light-emitting element is provided (e.g., the edge of the opening). This can eliminate the problem of visible mesh caused by uneven light intensity and is beneficial to improving the display effect of the display device including the light guide plate assembly 1.

[0048] Moreover, based on the setting method provided in the embodiments of the present invention, there is no need to set a diffuser plate in the light guide plate assembly 1, which can eliminate the problem of visible mesh, which is beneficial to reduce the cost of the light guide plate assembly 1 and reduce the thickness of the light guide plate assembly 1.

[0049] When configuring the diverging portion 121 and the converging portion 122, for example, as follows: Figure 2 , Figure 3 and Figure 4 As shown, the diverging portion 121 in the light guide plate unit 10 is disposed corresponding to the light-emitting element placement area A1. That is, the orthographic projection of the diverging portion 121 onto the plane where the light guide plate assembly 1 is located is within the light-emitting element placement area A1. The converging portion 122 is disposed away from the light-emitting element placement area A1. That is, the orthographic projection of the converging portion 122 onto the plane where the light guide plate assembly is located is disposed away from the light-emitting element placement area A1.

[0050] For example, such as Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment of the invention, the converging portion 122 can be positioned close to the edge S of the opening H. When the light guide plate assembly 1 and the light-emitting element 30 are assembled to form the backlight module 100, and when the light-emitting element 30 is positioned corresponding to the center position of the opening H, as... Figure 3 and Figure 4 As shown, along the thickness direction h1 of the light guide plate assembly 1, in this embodiment of the invention, the converging portion 122 and the light-emitting element 30 can be offset from each other. This arrangement allows more large-angle light rays to be directed towards the converging portion 122. In this embodiment of the invention, the light emission angle refers to the acute angle between the propagation direction of the light emitted by the light-emitting element 30 and the thickness direction of the light guide plate assembly 1. The aforementioned large-angle light rays refer to light rays emitted by the light-emitting element 30 with a large angle between them and the thickness direction h1 of the light guide plate assembly 1. Figure 4 Taking the large-angle light rays R11, R12, and R13 as examples, these rays can converge towards the edge S near the opening H via the converging part 122 during their emission from the light guide plate assembly 1. Based on the arrangement provided in this embodiment of the invention, the light intensity at the edge S of the opening H can be increased using large-angle light rays, thereby improving the utilization rate of large-angle light rays. Furthermore, it can prevent large-angle light rays from continuing to illuminate areas where other light-emitting elements 30 are located; that is, it can prevent crosstalk between light rays emitted by different light-emitting elements 30.

[0051] For example, such as Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment of the invention, the emitting portion 121 can be positioned corresponding to the center of the opening H. When the light guide plate assembly 1 and the light-emitting element 30 are assembled to form the backlight module 100, as described above, in this embodiment of the invention, the light-emitting element 30 can be positioned corresponding to the center of the opening H. By positioning the emitting portion 121 close to the center of the opening H, this embodiment of the invention allows as many small-angle light rays as possible to be directed towards the emitting portion 121. Small-angle light rays refer to light rays emitted by the light-emitting element 30 with a small angle between them and the thickness direction h1 of the light guide plate assembly 1. Figure 4Taking the small-angle rays R21 and R22 as examples, these rays can be diffused towards a side deviating from the center of the opening H via the divergence section 121 during their emission from the light guide plate assembly 1. Compared to large-angle rays, the small-angle rays emitted by the light-emitting element 30 have a larger light intensity. In this embodiment of the invention, by having the divergence section 121 diffuse the small-angle rays emitted by the light-emitting element 30, the number of small-angle rays hitting the center of the opening H can be reduced, thereby reducing the light intensity at the center of the opening H and making the light intensity at the center of the opening H and the light intensity at the edge of the opening H more consistent.

[0052] Optional, such as Figure 2 , Figure 3 and Figure 4 As shown, the reflective portion 11 includes a reflective surface 111 and a bottom surface 112 near the light-incident side 101 of the light guide plate assembly 1. An angle α1 is formed between the reflective surface 111 and the bottom surface 112. In this embodiment of the invention, 0° < α1 < 90°. Figure 4 As shown, for a portion of the large-angle light emitted by the light-emitting element 30, such as light ray R14, the reflecting surface 111 can adjust the propagation direction of this portion of the light by reflection, preventing this portion of the light from hitting other light-emitting element locations, thus avoiding crosstalk between this portion of the large-angle light and the light emitted by the light-emitting element 30 located in other positions. For example, as... Figure 4 As shown, after the light ray R14 is reflected by the reflecting surface 111, the reflected light ray can be directed toward the converging part 122. After being acted upon by the converging part 122, it can be deflected toward the edge S of the opening H, which can further increase the brightness near the edge S of the opening H.

[0053] For example, such as Figure 2 , Figure 3 and Figure 4 As shown, the reflective surface 111 surrounds the opening H. That is, the reflective part 11 forms a reflective cup structure with a cup-like shape.

[0054] Optional, such as Figure 2 , Figure 3 and Figure 4 As shown, the reflective surface 111 surrounds the converging part 122, and the converging part 122 surrounds the diverging part 121.

[0055] For example, such as Figure 4As shown, the reflective surface 111 includes a first part 1111 and a second part 1112. The second part 1112 is located on the side of the first part 1111 near the light-emitting side 102 of the light guide plate assembly 1. The first part 1111 does not contact the converging part 122, while the second part 1112 does contact the converging part 122. This arrangement allows the second part 1112 to first reflect a portion of the large-angle light emitted by the light-emitting element 30. After the propagation direction of this portion of large-angle light is adjusted by reflection, the converging part 122 can continue to act on this portion of light to converge it towards the edge S near the opening H, which is beneficial for further increasing the light intensity near the edge of the opening H.

[0056] For example, such as Figure 2 , Figure 3 and Figure 4 As shown, along the direction perpendicular to the plane where the light guide plate assembly 1 is located, the diverging part 121 and the reflecting surface 111 do not overlap, so as to avoid small-angle light being reflected by the reflecting surface 111, thereby reducing the loss caused by the reflection of small-angle light.

[0057] For example, such as Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment of the invention, the curvature of the surface of the focusing portion 122 near the light-incident side of the light guide plate assembly 1 can be set to be greater than 0. That is, as... Figure 4 As shown, the converging portion 122 is configured to include a convex lens 1220 on the side close to the light-emitting element 30. The convex lens 1220 is located on the side of the transmission portion 12 close to the light-incident side 101 of the light guide plate assembly 1.

[0058] For example, such as Figure 4 As shown, the reflective surface 111 includes a first edge S1 near the light-emitting side 102 of the light guide plate assembly 1 and a second edge S2 near the light-incident side 101 of the light guide plate assembly 1. The first edge S1 is the edge S of the opening H near the light-emitting side 102 of the light guide plate assembly 1. Along a direction parallel to the plane of the light guide plate assembly 1, the second edge S2 is located on the side of the first edge S1 near the center of the opening H.

[0059] When setting the convex lens 1220, in this embodiment of the invention, the focal point O1 of the convex lens 1220 can be set on the first edge S1, that is, the focal point O1 coincides with the first edge S1. This setting allows light rays incident on the convex lens 1220 to converge at the edge S of the opening after passing through the convex lens 1220, thereby increasing the brightness at the edge S of the opening H.

[0060] It should be noted that in the light guide plate assembly 1, the first edge S1 can be a closed loop surrounding the opening H. Figure 4In the cross-sectional view of the light guide plate assembly 1 shown, the position of the first edge S1 is indicated by the upper end point of the reflective surface 111 near the opening H.

[0061] Alternatively, in embodiments of the present invention, the focal point O1 of the convex lens 1220 may be positioned away from the non-opening position of the reflecting portion 11. Optionally, such as... Figure 4 As shown, in this embodiment of the invention, the focal point O1 of the convex lens 1220 can be set on the side of the reflective surface 111 near the light-emitting side 102 of the light guide plate assembly 1. Figure 4 The image illustrates this by positioning the focal point O1 of the convex lens 1220 directly above the first edge S1. Figure 4 In the process, the focal point O1 of the convex lens 1220 is located on the side of the reflective part 11 near the light-emitting side 102 of the light guide plate assembly 1, and the orthographic projection of the focal point O1 of the convex lens 1220 onto the plane of the light guide plate assembly 1 is located on the first edge S1.

[0062] In this embodiment of the invention, by setting the focal point O1 of the convex lens 1220 away from the non-opening position of the reflecting portion 11, or by setting the focal point O1 of the convex lens 1220 on the first edge S1, the light rays incident on the convex lens 1220 can be prevented from converging into the reflecting portion 11. Since light is lost during reflection, this arrangement can reduce the loss of converging light rays during the process of exiting the light guide plate assembly 1, which is beneficial to improving the light intensity utilization rate of the backlight module 100 including the light guide plate assembly 1. Moreover, by adopting this arrangement, while increasing the light intensity near the edge S of the opening H, it can also ensure that the small-angle light rays emitted by the light-emitting element 30 can reach the reflecting surface 111 as little as possible after passing through the transmission portion 12, thereby reducing the loss of small-angle light rays due to reflection.

[0063] When setting the divergence section 121, options include, for example... Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment of the invention, the curvature of the surface of the diverging portion 121 near the light-incident side 101 of the light guide plate assembly 1 can be set to be less than 0. That is, as... Figure 4 As shown, the diverging section 121 is configured to include a concave lens 1210, which is located on the side of the transmission section 12 near the light incident side 101 of the light guide plate assembly 1.

[0064] Optional, such as Figure 5 As shown, Figure 5This is a cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention. The surface of the converging portion 122 near the light incident side 101 of the light guide plate assembly 1 includes a first surface P1. In this embodiment of the present invention, the curvature of the first surface P1 can be set to 0, and the direction X1 pointing from the edge of the opening H to the center of the opening H can be gradually reduced. The light emitting surface of the light guide plate assembly 1 is the surface of the light guide plate assembly 1 near the light emitting side 102. That is, the first surface P1 is inclined relative to the plane where the light guide plate assembly 1 is located, so that there is an angle between the first surface P1 and the plane where the light guide plate assembly 1 is located. Figure 5 As shown, the first surface P1 is in Figure 5 The shape shown in the cross-sectional diagram is a straight line.

[0065] For the large-angle light emitted by the light-emitting element 30 that is directed toward the first surface P1, Figure 5 Taking the light ray R15 as an example, compared with the incident light ray, the refracted light ray R15 after passing through the first surface P1 is deflected to a position closer to the edge S of the opening H, thus increasing the light intensity at the edge S of the opening H.

[0066] For the small-angle light emitted by the light-emitting element 30 that is directed toward the first surface P1, Figure 5 Taking the light ray R23 as an example, after passing through the first surface P1, the refracted light ray corresponding to R23 can bypass the reflecting surface 111 and exit directly through the transmission part 12. This arrangement can reduce the light loss caused by reflection of light rays at small angles.

[0067] For example, the first surface P1 can be the side surface of a frustum or a pyramid structure.

[0068] Optional, continue to refer to Figure 5 As shown, the surface of the diverging portion 121 near the light-incident side 101 of the light guide plate assembly 1 includes a second surface P2. In this embodiment of the invention, the curvature of the second surface P2 can be set to 0, and the distance between the second surface P2 and the light-emitting surface of the light guide plate assembly 1 can be gradually reduced along the direction X1 from the edge of the opening H to the center of the opening H. For the light emitted by the light-emitting element 30 that is directed toward the transmission portion 12, Figure 5 Taking the light ray R23 as an example, compared with the incident light ray, the refracted light ray after passing through the second surface P2 deflects to a position away from the center of the opening H. Therefore, it can reduce the light intensity at the center of the opening H, which is conducive to making the light intensity at the center of the opening H and the light intensity at the edge of the opening H more consistent.

[0069] For example, in embodiments of the present invention, the second surface P2 and the first surface P1 can be the side surfaces of the same frustum or truncated pyramid structure. That is, the first surface P1 and the second surface P2 are not connected by an inflection point to facilitate the processing of the diverging portion 121 and the converging portion 122.

[0070] For example, such as Figure 6 As shown, Figure 6 This is a cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention. The diverging portion 121 includes a third surface P3 near the light incident side 101 of the light guide plate assembly 1, extending in a direction X1 from the edge S of the opening H to the center of the opening H. The distance between the third surface P3 and the light emitting surface of the light guide plate assembly 1 first decreases and then increases, that is, the third surface P3 includes... Figure 6 The undulating structure 4 is shown. By adopting this setting, while improving the consistency of light intensity at the center and edge S of the opening H, the distance between the center of the diverging part 121 and the light-emitting surface of the light guide plate assembly 1 can be increased. This can avoid the appearance of optical bright spots at the center of the diverging part 121, which is conducive to improving the image quality of the display module including the light guide plate assembly 1.

[0071] It should be noted that between the edge and the center of the diverging portion 121, Figure 6 The case shown with one undulating structure 4 in the third surface P3 is only an illustration. While ensuring the distance between the center position of the diverging part 121 and the light emitting surface of the light guide plate assembly 1, the present invention embodiment can provide two or more undulating structures 4 in the third surface P3 between the edge and the center of the diverging part 121. The present invention embodiment does not limit the number of undulating structures 4.

[0072] For example, such as Figure 6 As shown, the third surface P3 includes a first sub-surface P31 adjacent to the first surface P1, and the first sub-surface P31 has the same curvature as the first surface P1. For example, the curvature of the first sub-surface P31 and the first surface P1 can both be 0. With this configuration, the first surface P1 and the first sub-surface P31 can be formed using the same processing technology.

[0073] Optional, such as Figure 6 As shown, the third surface P3 also includes a second sub-surface P32 near the center of the opening H, and the cross-sectional shape of the second sub-surface P32 is V-shaped.

[0074] It should be noted that, Figure 4 , Figure 5 and Figure 6 The structure is only for illustration, such as Figure 7 As shown, Figure 7This is a cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention. In this embodiment of the present invention, the converging part 122 may be configured to include a convex lens 1220, and the curvature of the second surface P2 of the diverging part 121 may be set to 0. Figure 7 This is a schematic diagram showing the shape of the diverging part 121 as an inverted V shape, or it can be set to a shape similar to M, which will not be shown in the attached diagram.

[0075] Or, such as Figure 8 As shown, Figure 8 This is a cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention. In this embodiment of the present invention, the curvature of the first surface P1 of the converging part 122 can be set to 0, and the diverging part 121 can be configured to include a concave lens 1210.

[0076] Optional, such as Figure 9 As shown, Figure 9 This is a cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention. The surface of the converging portion 122 near the light incident side 101 of the light guide plate assembly 1 includes a first microstructure 21. The arrangement of the first microstructure 21 can allow some of the large-angle light emitted by the light-emitting element 30 (such as...) Figure 9 The propagation direction of the large-angle light ray (R16) shown is adjusted multiple times within the converging portion 122. In this embodiment of the invention, by processing the surface of the converging portion 122, a first microstructure 21 is provided on the surface of the converging portion 122 near the light-incident side 101 of the light guide plate assembly 1. On one hand, this facilitates the convergence of more large-angle light rays to the vicinity of the edge of the opening H, further increasing the brightness at the edge of the opening H and making the light intensity at the edge of the opening H closer to the light intensity at the center of the opening H. On the other hand, the first microstructure 21 can also scatter the light incident on its surface, thereby improving the uniformity of the light emitted from different positions of the converging portion 122.

[0077] For example, such as Figure 9 As shown, the first microstructure 21 includes a protruding structure that protrudes from the converging portion 122 toward the light-incident side 101 of the light guide plate assembly 1. The protruding structure is equivalent to a convex lens, which enables multiple beams of light incident on its surface to converge inside. This converging effect, combined with the converging effect of the converging portion 122, can further increase the light intensity at the edge of the opening H.

[0078] Optionally, in embodiments of the present invention, the shape of the above-mentioned protrusion structure may be configured to include a cone and / or a semi-ellipsoid. Figure 9 This is a schematic diagram of a cross-section where the protruding structure is set as a semi-ellipsoid.

[0079] For example, continue to refer to Figure 9As shown, the surface of the diverging portion 121 near the light-incident side 101 of the light guide plate assembly 1 includes a second microstructure 22. The arrangement of the second microstructure 22 allows the small-angle light emitted by the light-emitting element 30 (such as...) to... Figure 9 The propagation direction of the large-angle light ray (R24) shown is adjusted multiple times within the divergence section 121. This arrangement, on the one hand, helps to deflect more small-angle light rays away from the center of the opening H, allowing the light intensity at the center of the opening H to further approach the light intensity at the edge of the opening H. On the other hand, the second microstructure 22 can also scatter the light incident on its surface, thereby improving the uniformity of the light emitted from the divergence section 121.

[0080] Optional, such as Figure 9 As shown, the second microstructure 22 includes a recessed structure, which is recessed towards the side near the light-emitting side 102 of the light guide plate assembly 1. The recessed structure is equivalent to a concave lens, which can cause multiple beams of light incident on its surface to diverge. This divergence effect, combined with the divergence effect of the diverging part 121, can further reduce the light intensity at the center position of the opening H.

[0081] For example, the shape of the recessed structure includes a cone and / or a semi-ellipsoid. Figure 9 This is a schematic diagram of a cross-section where the concave structure is designed as a semi-ellipsoid.

[0082] For example, such as Figure 10 and Figure 11 As shown, Figure 10 and Figure 11 The following are cross-sectional schematic diagrams of two other light guide plate units provided in embodiments of the present invention. The surface of the transmissive portion 12 near the light-emitting side 102 of the light guide plate assembly 1 includes a third microstructure 23. Along a direction parallel to the plane where the light guide plate assembly 1 is located, the distance L between the third microstructure 23 and the center of the opening H is greater than 0. When light is incident on the surface of the transmissive portion 12 near the light-emitting side 102 of the light guide plate assembly 1, compared to setting this surface as a plane, the arrangement of the third microstructure 23 can reduce the incident angle of the incident light, that is, reduce the angle between the incident light and the normal of the surface of the transmissive portion 12 near the light-emitting side 102 of the light guide plate assembly 1. This allows the incident angle of the incident light to be less than the critical angle for total internal reflection, ensuring that the incident light can exit the light guide plate assembly normally. This can improve the utilization rate of the light emitted by the light-emitting element 30, avoid total internal reflection during the process of light exiting the light guide plate assembly 1, and reduce losses.

[0083] For example, the third microstructure 23 includes a cone and / or a semi-ellipsoid. Figure 10 and Figure 11 A schematic diagram of a cross-section of the third microstructure 23 as a cone.

[0084] For example, in embodiments of the present invention, any one of the first microstructure 21, the second microstructure 22, and the third microstructure 23 can be processed by machining and / or etching. For instance, in embodiments of the present invention, any one of the first microstructure 21, the second microstructure 22, and the third microstructure 23 having a conical and / or semi-ellipsoidal shape can be machined on the surface of the light guide plate assembly 1 using a molding die. Optionally, when fabricating the second microstructure 22 with a recessed structure, in embodiments of the present invention, protrusions can be etched on the surface of the die using an etching process, and then, when the transmissive portion 12 is fabricated using an injection molding process, a recessed structure can be fabricated on the surface of the diverging portion 121.

[0085] For example, in an embodiment of the present invention, the reflective part 11 and the transmissive part 12 can be manufactured separately and then bonded together with an adhesive to improve the strength of the bond.

[0086] Alternatively, in embodiments of the present invention, the reflective portion 11 and the transmissive portion 12 can be integrally formed to simplify the molding process of the light guide plate assembly 1 and improve the bonding strength between the two. Furthermore, with this arrangement, there is no need for a frame for fixing the reflective portion 11 and the transmissive portion 12, allowing for a narrower bezel in the backlight module when the light guide plate assembly 1 is used. For example, the reflective portion 11 and the transmissive portion 12 can be integrally formed using injection molding.

[0087] For example, the reflective portion 11 may include a white material to improve its reflectivity. For example, the reflective portion 11 may include acrylic or polycarbonate (PC).

[0088] For example, the above-mentioned transmissive portion 12 includes a transparent material to ensure that the transmissive portion 12 has a high transmittance and ensure the transmission effect of light.

[0089] This invention also provides a backlight module, combined with Figure 3 , Figure 4 and Figure 12 As shown, Figure 12 This is a schematic diagram of the stacking of a backlight module 100 provided in an embodiment of the present invention. The backlight module 100 includes a light-emitting element 30 and the light guide plate assembly 1 described above. The light guide plate assembly 1 is located on the light-emitting side of the light-emitting element 30.

[0090] When the backlight module 100 is working, the light-emitting element 30 emits light. The light emitted by the light-emitting element 30 is guided by the light guide plate assembly 1 and then emitted to the display panel (not shown) located on the light-emitting side of the light guide plate assembly 1, so that the display device displays an image.

[0091] The backlight module 100 provided in this embodiment of the invention, by configuring the light guide plate assembly 1 to include the above-mentioned transmission part 12 and reflection part 11, and configuring the transmission part 12 to include the diverging part 121 and the converging part 122, when applied to a backlight module, can increase the intensity of light emitted from the area near the edge S of the opening of the reflection part 11 in the light guide plate assembly 1, so as to balance the intensity of light emitted from different positions such as the area in the opening H where the light-emitting element 30 is provided and the area where the light-emitting element 30 is not provided, and can eliminate the problem of visible mesh caused by uneven light intensity.

[0092] Moreover, based on the setting method provided in the embodiments of the present invention, there is no need to set a diffuser plate in the light guide plate assembly 1, which can eliminate the problem of visible mesh, which is beneficial to reduce the cost of the backlight module 100 and reduce the thickness of the backlight module 100.

[0093] For example, such as Figure 3 and Figure 12 As shown, the backlight module 100 includes a plurality of light-emitting elements 30. The plurality of light-emitting elements 30 are arranged in a planar array on which the backlight module 100 is located. For example, the light-emitting elements 30 include Mini LED chips.

[0094] For example, such as Figure 3 and Figure 12 As shown, in the backlight module 100, the reflective surface 111 of the light guide plate assembly 1 surrounds the light-emitting element 30. This arrangement allows the reflective surface 111 to reflect more large-angle light emitted by the light-emitting element 30, which helps to increase the utilization rate of the light emitted by the light-emitting element 30 and reduce the crosstalk between the light emitted by different light-emitting elements 30.

[0095] It should be noted that, Figure 12 The shape of the orthographic projection of the light-emitting element 30 onto the plane of the backlight module 100 shown is a quadrilateral, and the shape of the orthographic projection of the opening H of the reflective part 11 onto the plane of the backlight module 100 is a circle. This is only an illustration. The shapes of the orthographic projections of the light-emitting element 30 and the opening H onto the plane of the backlight module 100 can be designed according to different design requirements. This embodiment of the invention does not limit the shape of the orthographic projections of the light-emitting element 30 and the opening H onto the plane of the backlight module 100.

[0096] Optional, such as Figure 4 As shown, along a direction parallel to the plane of the light guide plate assembly 1, the reflective portion 11 and the light-emitting element 30 at least partially overlap, meaning that the light-emitting element 30 can be at least partially embedded within the light guide plate assembly 1. This arrangement facilitates a thinner design for the backlight module 100.

[0097] For example, such as Figure 4As shown, the light-emitting element 30 is located on the side of the transmission section 12 near the light-incident side 101 of the light guide plate assembly 1, and at least a portion of the light-emitting element 30 is located within the opening H to reduce the thickness of the backlight module 100.

[0098] For example, such as Figure 4 As shown, the light-emitting element 30 is located on the side of the emitting portion 121 near the light-incident side 101 of the light guide plate assembly 1.

[0099] For example, such as Figure 4 As shown, along the thickness direction of the backlight module 100, the light-emitting element 30 and the radiating portion 121 at least partially overlap. With this arrangement, the radiating portion 121 can be used to diffuse the small-angle light emitted by the light-emitting element 30, thereby balancing the brightness difference between the location where the light-emitting element 30 is located and other locations in the backlight module 100.

[0100] For example, such as Figure 4 As shown, along the thickness direction of the backlight module 100, the light-emitting element 30 and the converging part 122 do not overlap, so as to avoid the small-angle light emitted by the light-emitting element 30 being further converged by the converging part 122.

[0101] Optional, such as Figure 4 and Figure 5 As shown, the converging portion 122 includes a first end D1 located near the diverging portion 121. The angle γ between the line D1O2 connecting the first end D1 and the geometric center O2 of the light-emitting element 30 and the thickness direction h1 of the backlight module 100 is greater than or equal to 20°. This arrangement can reduce the amount of small-angle light emitted by the light-emitting element 30 received by the converging portion 122.

[0102] When the converging portion 122 is configured to include a convex lens, the position and specifications of the convex lens can be set according to the specifications of the light-emitting element 30 in this embodiment of the invention.

[0103] Optional, such as Figure 13 As shown, Figure 13 This is a cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention. The angle between the line connecting the focal point O1 of the convex lens and the center O2 of the light-emitting element 30 and the thickness direction h1 of the backlight module 100 is β. 11 In this embodiment of the invention, the critical emission angle of the light emitted by the light-emitting element 30 that satisfies the preset light intensity condition is β2. Figure 13 (Not shown), when setting the convex lens, embodiments of the present invention can make β 11 =β2.

[0104] For example, the preset light intensity condition can be set according to different optical performance requirements of the backlight module 100. For instance, in this embodiment of the invention, the preset light intensity condition can be defined as satisfying that the light intensity is greater than or equal to half of the maximum luminous intensity. The light intensity of the light-emitting element 30 is related to the light emission angle of the light emitted by the light-emitting element 30. Generally speaking, the larger the light emission angle, the smaller the light intensity. The luminous intensity is maximum when the light emission angle is 0, that is, when the light emission direction is parallel to the normal direction of the plane containing the light-emitting surface of the light-emitting element. When the preset light intensity condition is set to be greater than or equal to half of the maximum luminous intensity, the aforementioned critical light emission angle β2 refers to the luminous intensity being greater than or equal to half of the maximum luminous intensity when the light emission angle is less than or equal to β2.

[0105] The embodiments of the present invention, by letting β 11 =β2, on the one hand, it allows the light emitted by the light-emitting element 30 within the critical emission angle to exit from the side of the O1O2 connection away from the reflecting surface 111 as much as possible after passing through the convex lens. That is, it allows the light emitted by the light-emitting element 30 within the critical emission angle to hit the reflecting surface 111 as little as possible, and to exit the light guide plate assembly 1 directly from the transmission part 12 as much as possible, so as to reduce the light loss caused by reflection by the reflecting surface 111 and improve the light intensity utilization rate. On the other hand, for the light emitted by the light-emitting element that is greater than the critical emission angle, based on the above arrangement, it allows this part of the light to enter the convex lens from the side of the O1O2 connection closer to the reflecting surface 111 as much as possible for convergence, which is beneficial to further enhance the light intensity near the edge S position of the opening H.

[0106] When the converging portion 122 is configured to include a convex lens, optionally, such as Figure 13 As shown, the line connecting the focal point O1 of the convex lens and the center O2 of the light-emitting element 30 intersects the convex lens at a first intersection point B. The tangent of the convex lens at the first intersection point B is perpendicular to the line O1O2 connecting the focal point O1 of the convex lens and the center O2 of the light-emitting element 30. This arrangement allows as much of the light emitted by the light-emitting element 30, propagating along the side of the line O1O2 near the center of the opening H, to exit through the transmission section 12 as much as possible and to hit the reflecting surface 111 as little as possible, thus reducing light loss caused by reflection by the reflecting surface 111 and improving light intensity utilization. Furthermore, for light emitted by the light-emitting element 30 exceeding the critical emission angle, this arrangement allows this portion of the light to converge onto the convex lens from the side of the line O1O2 near the reflecting surface 111, further enhancing the light intensity near the edge S of the opening H.

[0107] When the curvature of the surface of the converging portion 122 near the light-incident side 101 of the light guide plate assembly 1 is set to 0, and the distance between the first surface P1 and the light-emitting surface of the light guide plate assembly 1 is gradually reduced along the direction X1 from the edge of the opening H to the center of the opening H, such that... Figure 5 As shown, the angle between the first surface P1 and the thickness direction h1 of the backlight module 100 is β. 12 The critical emission angle of the light emitted by the light-emitting element 30 that satisfies the preset light intensity condition is β2 (not shown). In this embodiment of the invention, β 12 +β2 = 90°. That is, the propagation direction of the first surface P1 and the light ray with the critical emission angle are perpendicular. This arrangement allows as much of the light emitted by the light-emitting element 30 within the critical emission angle to exit through the transmission section 12 as possible, and as little as possible to be reflected by the reflecting surface 111, thereby reducing light loss caused by reflection by the reflecting surface 111 and improving light intensity utilization. On the other hand, for the light emitted by the light-emitting element 30 with an emission angle greater than the critical emission angle, based on the above arrangement, this portion of light can be converged by the converging section 122 as much as possible, which is beneficial to further enhance the light intensity near the edge S position of the opening H.

[0108] For example, in combination Figure 10 and Figure 11 As shown, the surface of the transmissive portion 12 near the light-emitting side 102 of the light guide plate assembly 1 includes a third microstructure 23. Along a direction parallel to the plane of the light guide plate assembly 1, the distance between the third microstructure 23 and the center of the opening H is L. The distance L between the third microstructure 23 and the center of the opening H refers to the shortest distance between them. In this embodiment of the invention, L > 0.

[0109] For example, the critical light emission angle of the light emitted by the light-emitting element 30 that satisfies the preset light intensity condition is β2, the refractive index of the transmission section 12 is n1, the refractive index of the medium on the side of the light guide plate assembly 1 away from the light-emitting element 30 is n2, and the refractive index of the medium between the light-emitting element 30 and the transmission section 12 is n3. The distance between the geometric center of the light-emitting element 30 and the light-emitting surface of the light guide plate assembly 1 is H; in this embodiment of the invention, L≥H×tanθ.

[0110] Combination Figure 14 As shown, Figure 14 This is a schematic diagram illustrating the positioning principle of the third microstructure in a light guide plate unit according to an embodiment of the present invention. For the critical ray Rc emitted by the light-emitting element 30, the critical ray Rc refers to the ray emitted by the light-emitting element 30 that can undergo total internal reflection when incident on the light-emitting surface of the light guide plate assembly 1. Figure 14As shown, the angle between the propagation direction of the critical ray Rc and the thickness direction of the light guide plate assembly 1 is θ1. In this embodiment of the invention, by setting L≥H×tanθ1, the third microstructure ( Figure 14 (Not shown) can cover the distribution range of light that would otherwise undergo total internal reflection on the light-emitting surface of the light guide plate assembly 1, so that the third microstructure can reduce the incident angle of this part of the light when it shines on the light-emitting surface of the light guide plate assembly 1, so that this part of the light can smoothly exit the light guide plate assembly 1.

[0111] like Figure 14 As shown, θ1 = θ2 - θ3, where θ2 is the angle between the normal of the surface of the transmissive part 12 near the light-emitting element 30 and the thickness direction h1 of the light guide plate assembly 1; θ3 is the angle between the normal of the surface of the transmissive part 12 near the light-emitting element 30 and the critical ray Rc.

[0112] Furthermore, since n3sinθ3=n1sinθ4; where θ4 is the angle between the critical ray Rc emitted from the surface of the transmission section 12 near the light-emitting element 30 and the thickness direction h1 of the light guide plate assembly 1; and θ6=θ4+θ5, where θ5 is the angle between the propagation direction of the critical ray Rc when it strikes the light-emitting surface of the light guide plate assembly 1 and the thickness direction h1 of the light guide plate assembly 1, because the critical ray Rc undergoes total internal reflection when it exits the light guide plate assembly 1, therefore θ6 is the angle between the normal of the surface of the part of the transmissive section 12 near the light-emitting element 30 and the thickness direction h1 of the light guide plate assembly 1.

[0113] For example, when the surface of the transmissive portion 12 near the light-emitting element 30 is perpendicular to the propagation direction of the light emitted by the light-emitting element 30 having the aforementioned critical emission angle β2, θ6 = θ2 = β2. Based on the above derivation, we can conclude that:

[0114] For example, the medium on the side of the light guide plate assembly 1 away from the light-emitting element 30 and the medium between the light-emitting element 30 and the transmission part 12 can be air, i.e., n2=1, n3=1.

[0115] It should be noted that, Figure 14 The description of the position of the third microstructure only takes the example of setting the curvature of the surface of the transmissive portion 12 near the light-emitting element 30 to 0. When the curvature of the surface of the transmissive portion 12 near the light-emitting element 30 is set to be greater than or less than 0, such as... Figure 10 As shown, the same rules for setting the position of the third microstructure 23 also apply.

[0116] Optional, such as Figure 10 and Figure 11As shown, in this embodiment of the invention, the third microstructure 23 can be configured to include serrations. The serrations include an inclined surface 230, which forms an angle α2 with the thickness direction h1 of the light guide plate assembly 1, where α2 = 90° - θ1. This configuration effectively makes the propagation direction of the critical light ray emitted by the light-emitting element 30, corresponding to total internal reflection, parallel to the normal direction of the inclined surface 230, thereby increasing the brightness of the light emitted perpendicular to the light-emitting surface of the light guide plate assembly 1.

[0117] Optional, such as Figure 10 and Figure 11 As shown, in this embodiment of the invention, the saw teeth can be configured to include an inclined surface 230, that is, the cross-sectional shape of the saw teeth is as follows. Figure 10 and Figure 11 The right triangle shown has a hypotenuse 230° corresponding to the hypotenuse of the right triangle.

[0118] Or, such as Figure 15 As shown, Figure 15 This is a cross-sectional schematic diagram of another light guide plate unit provided in an embodiment of the present invention. In this embodiment, the sawtooth can also include two inclined surfaces 230, that is, the cross-sectional shape of the sawtooth is as shown below. Figure 15 The isosceles triangle shown has two inclined planes 23° corresponding to the two legs of the isosceles triangle.

[0119] This invention also provides a display device, such as... Figure 16 As shown, Figure 16 This is a schematic diagram of a display device provided in an embodiment of the present invention. The display device includes a display panel and the aforementioned backlight module 100. The display panel is located on the light-emitting side of the backlight module 100. The display panel includes a liquid crystal display panel. The specific structure of the backlight module 100 has been described in detail in the above embodiments and will not be repeated here. Figure 16 The display device shown is for illustrative purposes only. The display device can be any electronic device with display function, such as a mobile phone, tablet computer, laptop computer, e-reader or television.

[0120] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A light guide plate assembly, characterized in that, include: The reflective part has an opening; A transmissive portion, at least a portion of which is located within the opening; the transmissive portion includes a converging portion and a diverging portion; the converging portion is used to converge light entering the converging portion toward a side away from the center of the opening, and the diverging portion is used to diverge light entering the diverging portion toward a side away from the center of the opening; the converging portion is located on the side of the transmissive portion away from the center of the opening. The surface of the converging portion near the light-incident side of the light guide plate assembly includes a first microstructure.

2. The light guide plate assembly according to claim 1, characterized in that, The reflective portion includes a reflective surface and a bottom surface near the light-incident side of the light guide plate assembly, wherein the reflective surface and the bottom surface have an included angle α1, where 0° < α1 < 90°.

3. The light guide plate assembly according to claim 1, characterized in that, The surface of the diverging portion near the light-incident side of the light guide plate assembly includes a second microstructure.

4. The light guide plate assembly according to claim 1, characterized in that, The converging portion includes a convex lens, which is located on the side of the transmissive portion near the light-incident side of the light guide plate assembly.

5. The light guide plate assembly according to claim 4, characterized in that, The reflective portion includes a reflective surface surrounding the opening, and the reflective surface includes a first edge near the light-emitting side of the light guide plate assembly; The focal point of the convex lens is located at the first edge, or the focal point of the convex lens is located on the side of the reflective surface near the light-emitting side of the light guide plate assembly.

6. The light guide plate assembly according to claim 1, characterized in that, The surface of the converging portion near the light-incident side of the light guide plate assembly includes a first surface with a curvature of 0, and the distance between the first surface and the light-emitting surface of the light guide plate assembly gradually decreases along the direction from the edge of the opening to the center of the opening.

7. The light guide plate assembly according to claim 6, characterized in that, The surface of the diverging portion near the light-incident side of the light guide plate assembly includes a second surface with a curvature of 0, and the distance between the second surface and the light-emitting surface of the light guide plate assembly gradually decreases along the direction from the edge of the opening to the center of the opening.

8. The light guide plate assembly according to claim 6, characterized in that, The diverging portion includes a third surface near the light-incident side of the light guide plate assembly, pointing from the edge of the opening towards the center of the opening, and the distance between the third surface and the light-emitting surface of the light guide plate assembly first decreases and then increases.

9. The light guide plate assembly according to claim 8, characterized in that, The third surface includes a first sub-surface adjacent to the first surface, the first sub-surface having the same curvature as the first surface.

10. The light guide plate assembly according to claim 1, characterized in that, The diverging portion includes a concave lens, which is located on the side of the transmitting portion near the light-incident side of the light guide plate assembly.

11. The light guide plate assembly according to claim 1, characterized in that, The diverging portion corresponds to the center of the opening.

12. The light guide plate assembly according to claim 1, characterized in that, The surface of the transmissive portion near the light-emitting side of the light guide plate assembly includes a third microstructure, and the distance between the third microstructure and the center of the opening is greater than 0 along a direction parallel to the plane of the light guide plate assembly.

13. A light guide plate assembly, characterized in that, include: The reflective part has an opening; The transmissive portion, at least a portion of which is located within the opening, includes a converging portion and a diverging portion; the curvature of the surface of the converging portion near the light-incident side of the light guide plate assembly is greater than or equal to 0; the curvature of the surface of the diverging portion near the light-incident side of the light guide plate assembly is less than or equal to 0. The surface of the converging portion near the light-incident side of the light guide plate assembly includes a first microstructure.

14. The light guide plate assembly according to claim 13, characterized in that, The reflective portion includes a reflective surface and a bottom surface near the light-incident side of the light guide plate assembly, wherein the reflective surface and the bottom surface have an included angle α1, where 0° < α1 < 90°.

15. The light guide plate assembly according to claim 13, characterized in that, The converging portion includes a convex lens, which is located on the side of the transmissive portion near the light-incident side of the light guide plate assembly.

16. The light guide plate assembly according to claim 13, characterized in that, The reflective portion includes a reflective surface surrounding the opening, and the reflective surface includes a first edge near the light-emitting side of the light guide plate assembly; The focal point of the convex lens is located at the first edge, or the focal point of the convex lens is located on the side of the reflective surface near the light-emitting side of the light guide plate assembly.

17. The light guide plate assembly according to claim 13, characterized in that, The surface of the converging portion near the light-incident side of the light guide plate assembly includes a first surface with a curvature of 0, and the distance between the first surface and the light-emitting surface of the light guide plate assembly gradually decreases along the direction from the edge of the opening to the center of the opening.

18. The light guide plate assembly according to claim 17, characterized in that, The surface of the diverging portion near the light-incident side of the light guide plate assembly includes a second surface with a curvature of 0, and the distance between the second surface and the light-emitting surface of the light guide plate assembly gradually decreases along the direction from the edge of the opening to the center of the opening.

19. The light guide plate assembly according to claim 17, characterized in that, The diverging portion includes a third surface near the light-incident side of the light guide plate assembly, pointing from the edge of the opening towards the center of the opening, and the distance between the third surface and the light-emitting surface of the light guide plate assembly first decreases and then increases.

20. The light guide plate assembly according to claim 13, characterized in that, The diverging portion includes a concave lens, which is located on the side of the transmitting portion near the light-incident side of the light guide plate assembly.

21. A backlight module, characterized in that, It includes a light-emitting element and a light guide plate assembly as described in any one of claims 1-20, wherein the light guide plate assembly is located on the light-emitting side of the light-emitting element.

22. The backlight module according to claim 21, characterized in that, The light-emitting element is located on the side of the transmissive portion near the light-incident side of the light guide plate assembly, and at least a portion of the light-emitting element is located within the opening.

23. The backlight module according to claim 21, characterized in that, Along the thickness direction of the backlight module, the light-emitting element and the radiating portion at least partially overlap.

24. The backlight module according to claim 21, characterized in that, Along the thickness direction of the backlight module, the light-emitting element and the converging portion do not overlap.

25. The backlight module according to claim 21, characterized in that, The converging portion includes a convex lens, which is located on the side of the transmissive portion near the light-incident side of the light guide plate assembly; The angle between the line connecting the focal point of the convex lens and the center of the light-emitting element and the thickness direction of the backlight module is β. 11 The critical emission angle of the light emitted by the light-emitting element that satisfies the preset light intensity condition is β2, where β 11 =β2.

26. The backlight module according to claim 21, characterized in that, The converging portion includes a convex lens, which is located on the side of the transmissive portion near the light-incident side of the light guide plate assembly; The line connecting the focal point of the convex lens and the center of the light-emitting element intersects the convex lens at a first intersection point, and the tangent of the convex lens at the first intersection point is perpendicular to the line connecting the focal point of the convex lens and the center of the light-emitting element.

27. The backlight module according to claim 23, characterized in that, The surface of the converging portion near the light-incident side of the light guide plate assembly includes a first surface; Along the direction from the edge of the opening towards the center of the opening, the distance between the first surface and the light-emitting surface of the light guide plate assembly gradually decreases; and the angle between the first surface and the thickness direction of the backlight module is β. 12 The critical emission angle of the light emitted by the light-emitting element that satisfies the preset light intensity condition is β2, β 12 +β2=90°.

28. The backlight module according to claim 21, characterized in that, The surface of the transmissive portion near the light-emitting side of the light guide plate assembly includes a third microstructure. Along a direction parallel to the plane of the light guide plate assembly, the distance between the third microstructure and the center of the opening is L. The critical light emission angle of the light emitted by the light-emitting element that satisfies the preset light intensity condition is β2. The refractive index of the transmissive portion is n1. The refractive index of the medium on the side of the light guide plate assembly away from the light-emitting element is n2. The refractive index of the medium between the light-emitting element and the transmissive portion is n3. The distance between the geometric center of the light-emitting element and the light-emitting surface of the light guide plate assembly is H; where L≥H×tanθ1.

29. The backlight module according to claim 28, characterized in that, The third microstructure includes serrations, each serration including an inclined surface, the inclined surface having an angle α2 with the thickness direction of the light guide plate assembly, wherein α2 = 90° - θ1.

30. A display device, characterized in that, It includes a display panel and a backlight module as described in any one of claims 21-29, wherein the display panel is located on the light-emitting side of the backlight module.

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