Backlight module and display device

Abstract

This invention provides a backlight module and a display device. The backlight module includes a light source substrate, a reflective cup, a diffuser film, a beam-splitting film, and a packaging shell. The light source substrate includes multiple light-emitting elements arranged in an array. The reflective cup is located on one side of the light source substrate where the light-emitting elements are arranged. The reflective cup includes multiple interconnected reflective cups, each with an opening at its center. At least one light-emitting element is located within the opening, and the reflective walls of the reflective cups surround the light-emitting elements. The diffuser film is located on the side of the reflective cup away from the light source substrate, and at least part of the reflective cup is in contact with the diffuser film. At least two stacked beam-splitting films are located on the side of the diffuser film away from the light source substrate. This configuration can reduce the distance between the diffuser film and the light-emitting elements, thereby reducing the thickness of the backlight module. Simultaneously, by utilizing the beam-splitting film, the grid pattern is eliminated, further reducing the distance between the side area of ​​the packaging shell and the light source substrate, achieving a narrow bezel for the backlight module.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a backlight module and display device. Background Technology

[0002] With the continuous development of liquid crystal display technology, liquid crystal display devices have been widely used in all aspects of life. A liquid crystal display device consists of a backlight module and a display panel. The backlight module provides the light source for the display panel and is an indispensable part of the liquid crystal display device.

[0003] Currently, when the backlight of existing display modules is designed as a direct-lit design, there are limitations in the stacking of film layers and the design of the bezel in the display module. For example, how to achieve thinner display modules, narrower bezels, and uniform display brightness are all problems that need to be solved to improve the performance of display modules. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a backlight module and display device. By configuring at least a portion of the reflective cup to contact the diffusion film, the distance between the diffusion film and the light-emitting element can be reduced, thus decreasing the thickness of the backlight module. Simultaneously, the addition of a beam-splitting film eliminates the grid-like effect and reduces the distance between the side area of ​​the encapsulation housing and the light source substrate, which is beneficial for achieving a narrow bezel in the backlight module.

[0005] In a first aspect, embodiments of the present invention provide a backlight module, comprising:

[0006] A light source substrate, comprising multiple light-emitting elements arranged in an array;

[0007] A reflective cup is located on one side of the light source substrate where the light-emitting elements are arranged; the reflective cup includes a plurality of interconnected reflective cups, each reflective cup having an opening at its center, at least one of the light-emitting elements being located within the opening, and the reflective walls of the reflective cups surrounding the light-emitting elements;

[0008] A diffusion film is located on the side of the reflective cup away from the light source substrate, and at least part of the reflective cup is in contact with the diffusion film.

[0009] At least two stacked beam-splitting films are located on the side of the diffusion film away from the light source substrate.

[0010] The light source substrate, the reflective cup, the diffusion film, and the beam-splitting film are all located within the area defined by the encapsulation housing.

[0011] Based on the same inventive concept, in a second aspect, embodiments of the present invention provide a display device including the backlight module described in the first aspect.

[0012] In the backlight module provided in this embodiment of the invention, the diffusion film is directly disposed on the side of the reflective cup away from the light source substrate, and at least part of the reflective cup is in contact with the diffusion film, compressing the distance between the diffusion film and the light-emitting element. At the same time, a beam-splitting film is added to eliminate the grid phenomenon. This achieves a reduction in the thickness of the backlight module. In addition, the diffusion film does not need to be attached to the side frame adhesive, which can reduce the area where the frame adhesive is disposed on the side of the encapsulation housing, and reduce the distance between the side of the encapsulation housing and the light source substrate, which is beneficial to achieving a narrow bezel of the backlight module. Attached Figure Description

[0013] Figure 1 This is a cross-sectional schematic diagram of a backlight module provided by existing technology;

[0014] Figure 2 This is a top view schematic diagram of a backlight module provided in an embodiment of the present invention;

[0015] Figure 3 for Figure 2 A cross-sectional schematic diagram of a backlight module along the AA' direction;

[0016] Figure 4 for Figure 2 A cross-sectional schematic diagram of a backlight module along the AA' direction;

[0017] Figure 5 for Figure 2 A cross-sectional schematic diagram of a backlight module along the BB' direction;

[0018] Figure 6 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0019] Figure 7 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0020] Figure 8 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0021] Figure 9 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0022] Figure 10 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0023] Figure 11 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0024] Figure 12 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0025] Figure 13 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0026] Figure 14 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0027] Figure 15 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction;

[0028] Figure 16 This is a schematic diagram of a display device provided in an embodiment of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0030] Figure 1 This is a cross-sectional schematic diagram of a backlight module provided by existing technology, for reference. Figure 1 In existing direct-lit display modules, a light source substrate 11, a reflector cup 12, and a diffuser film 13 are sequentially arranged within the encapsulation housing 10. Typically, a frame adhesive 14 is provided on the sidewall of the encapsulation housing 10, and the diffuser film 13 rests against the frame adhesive 14 to maintain its stability. This arrangement, in the horizontal direction... Figure 1 The X-direction or Y-direction makes the distance L between the sidewall area of ​​the packaging shell 10 and the light source substrate 11 too large, which is not conducive to the structural design of the narrow bezel of the backlight module. In the vertical direction, that is, along Figure 1 In the Z-direction, to achieve better LED light mixing and avoid defects such as grid patterns, the distance OD1 between the reflector cup 12 and the diffuser film 13 needs to meet certain numerical requirements, which results in a relatively large thickness of the backlight module. For example, in the prior art, the thickness of OD1 ranges from 4mm to 5mm, such as OD1 = 4.6mm.

[0031] Based on one or more of the problems mentioned above, embodiments of the present invention provide a display module. Figure 2 This is a top view schematic diagram of a backlight module provided in an embodiment of the present invention. Figure 3 for Figure 2A cross-sectional schematic diagram of a backlight module along the AA' direction, for reference. Figure 2 and Figure 3 This invention provides a backlight module comprising a light source substrate 20, a reflective cup 30, a diffusion film 40, a beam splitter 80, and a packaging housing 50. The backlight module 200 can be a direct-lit backlight module, and the light source substrate 20 includes a plurality of light-emitting elements 21 arranged in an array. The light source substrate 20 serves as the carrier substrate for the light-emitting elements 21. The light-emitting elements 21 can be LEDs (Light Emitting Diodes), Micro-LEDs (Micro Light Emitting Diode Displays), or Mini-LEDs (Mini Light Emitting Diodes). This invention does not limit the type of light-emitting element.

[0032] Taking Mini-LED as an example, Mini-LED is advantageous in achieving the characteristics of LCD (Liquid Crystal Display) such as thinness, high image quality, and low power consumption, with performance levels approaching those of OLED (Organic Light Emitting Diode Display), and superior to OLED in terms of brightness and color rendering. Furthermore, Mini-LED backlighting can be combined with precise local dimming technology to control the switching and brightness adjustment of corresponding backlight areas in real time, resulting in high contrast, more vibrant colors, and achieving a high dynamic range (HDR) screen effect. A driving circuit electrically connected to the light-emitting element 21 is also provided above, below, or inside the light source substrate 20 to provide light-emitting driving signals to the light-emitting element 21. The type of driving circuit is not limited in this embodiment of the invention.

[0033] Furthermore, a reflective cup 30 is disposed on one side of the light source substrate 20 where the light-emitting elements 21 are arranged. The reflective cup 30 includes a plurality of interconnected reflective cups 31, each with an opening at its center, and at least one light-emitting element 21 is located within the opening. In this embodiment of the invention, the reflective cup 31 can be disposed between two adjacent light-emitting elements 21, with the reflective wall of the reflective cup 31 surrounding the light-emitting element 21. The light emitted from the light-emitting element 21 is reflected once or multiple times by the reflective wall of the reflective cup 31, and then mixed and emitted towards the diffusion film 40, thereby improving the brightness and display uniformity of the light emitted by the light-emitting element 21.

[0034] In other embodiments, two or more light-emitting elements 21 may be provided in the central opening of the reflector cup 31 to meet different light-emitting requirements. These will not be shown one by one in the embodiments of the present invention.

[0035] It should be noted that the reflective cups 31 can be separately arranged, that is, the reflective cups 31 are independent structures, and each reflective cup 31 is located between two adjacent light-emitting elements 21. Alternatively, the reflective cups 31 can also be an integrally arranged mesh structure, that is, the mesh structure formed by multiple reflective cups 31 surrounds the light-emitting element 21 to form a reflective cup cover 30. The present invention does not limit the preparation method of the reflective cup cover 30.

[0036] The diffuser film 40 is located on the side of the reflector cup 30 away from the light source substrate 20, and at least part of the reflector cup 30 is in contact with the diffuser film 40. The diffuser film 40 can diffuse the light emitted by the light-emitting element 21, thereby ensuring uniform light output brightness of the backlight module 200. The diffuser film 40 and the reflector cup 30 can be fixed together using transparent light guide adhesive to prevent displacement of the diffuser film 40.

[0037] Unlike existing technologies where the reflective cup 30 overlaps with the side frame, this design, referencing... Figure 3 In this embodiment of the invention, the diffusion film 40 is directly disposed on the side of the reflective cup 30 away from the light source substrate 20, and at least part of the reflective cup 30 is in contact with the diffusion film 40. On the one hand, this can compress the distance between the diffusion film 40 and the light-emitting element 21, reducing the distance OD between the diffusion film 40 and the light source substrate 20, thereby reducing the thickness of the backlight module 200. For example, compared with the prior art, the distance OD between the diffusion film 40 and the light source substrate 20 can be reduced to 2mm, and the thickness of the backlight module 200 can be reduced by at least 1.4mm. On the other hand, the diffusion film 40 does not need to be attached to the side frame adhesive, which can reduce the area where the frame adhesive is disposed on the side of the encapsulation housing 50, reducing the distance L' between the side of the encapsulation housing 50 and the light source substrate 20. Compared with the prior art... Figure 1 With L' < L, this setting is beneficial for achieving a backlight-narrow bezel structural design.

[0038] It should be noted that when the diffuser 40 is lowered, the light mixing space between the diffuser 40 and the reflective cup 30 may be reduced, potentially exacerbating the grid pattern. Therefore, in this embodiment of the invention, at least one beam-splitting film 80 is disposed on the side of the diffuser 40 away from the light source substrate 20. This beam-splitting film is an optical thin film that can better disperse light. For example, a single light spot is dispersed into multiple light spots, thereby eliminating the grid pattern and improving the display uniformity of the display module. For example, the thickness of the beam-splitting film 80 is 0.2 mm to 0.4 mm.

[0039] The light source substrate 20, reflector cup 30, beam splitter 80, and diffuser 40 are all located within the area defined by the encapsulation housing 50, which is used to encapsulate and protect the internal components. The encapsulation housing 50 can be a one-piece die-cast structure, and its material can be aluminum alloy. A certain gap is provided between the light source substrate 20, reflector cup 30, and diffuser 40 and the sidewall of the encapsulation housing 50 to provide spacing during encapsulation. After all film layers are applied, encapsulating adhesive or other materials can be filled between the diffuser 40 and the encapsulation housing 50 for fixation.

[0040] It should be noted that the backlight module provided in this embodiment of the invention also includes other film layers, such as a transparent optical film (Dual Brightness Enhancement Film, DBEF), etc., wherein the DBEF is a reflective polarizing plate, which enhances the brightness of the light emitted by the light-emitting element 21 by reflecting polarized light, thereby improving the light output effect of the backlight module 200. The various structures in the backlight module work together to realize the backlight function of the backlight module, which will not be shown one by one in this embodiment of the invention.

[0041] Figure 4 for Figure 2 A cross-sectional schematic diagram of a backlight module along the AA' direction, based on the above embodiment, with reference to... Figure 2 and Figure 4 The reflective cup 31 includes a first reflective cup 311 and a second reflective cup 312. The first reflective cup 311 surrounds the second reflective cup 312 and is located in the edge region of the reflective cup cover 30. That is, the second reflective cup 312 is located in the central region of the mesh structure reflective cup cover 30, and the first reflective cup 311 is in the peripheral region. In this embodiment of the invention, the first reflective cup 311 may simply refer to the outermost ring of reflective cups 31 of the reflective cup cover 30. The first reflective cup 311 includes a first reflective wall 311a and a second reflective wall 311b. The first reflective wall 311a is close to the edge region of the reflective cup cover 30, and the second reflective wall 311b is away from the edge region of the reflective cup cover 30. That is, the first reflective wall 311a is the outermost ring of reflective walls of the reflective cup cover 30.

[0042] In existing technologies, the outermost ring of light-emitting elements 21 typically exhibits weak light mixing, resulting in less light reaching the edge of the diffusion film 40. This easily leads to low brightness in the edge region of the diffusion film 40, causing low edge brightness in the display module and affecting the overall display uniformity. In the embodiments of the present invention, reference... Figure 4 The reflective walls of the outermost first reflective cup 311 of the reflective cup cover 30 are designed differently to improve the edge brightness of the display module. For example, along the direction perpendicular to the plane of the light source substrate 20 ( Figure 4In the Z-direction, the height d1 of the first reflective wall 311a is set to be less than the height d2 of the second reflective wall 311b, or it can be set to be less than the height d3 of the reflective wall 312a of the second reflective cup 312. Here, d2 and d3 can be equal. This setting allows a gap to exist between the first reflective wall 311a and the diffusion film 40. Part of the light emitted by the light-emitting element 21 leaks through this gap to the side area of ​​the encapsulation housing 50. The inner wall of the side area of ​​the encapsulation housing 50 can be polished or coated to increase its reflectivity. This allows the light emitted by this portion of the light to be reflected from the side area of ​​the encapsulation housing 50 and then emitted from the side area of ​​the diffusion film 40, thereby increasing the light intensity at the edge of the diffusion film 40 and improving its brightness. This also increases the light mixing of the outermost ring of light-emitting elements 21 to some extent, thus improving the brightness of the backlight module 200's edge area and achieving uniform overall brightness of the backlight module 10.

[0043] In other embodiments, reference is made to Figure 4 Alternatively, the angle a1 between the first reflective wall 311a and the light source substrate 20 can be set to be smaller than the angle a2 between the second reflective wall 311b and the light source substrate 20. Or, it can be designed such that the angle a1 between the first reflective wall 311a and the light source substrate 20 is smaller than the angle a3 between the reflective wall 312a of the second reflective cup 312 and the light source substrate 20. That is, a1 < a2, a1 < a3, where a2 and a3 can be the same or different. This arrangement helps to achieve no contact between the first reflective wall 311a and the diffusion film 40, and creates a gap. Part of the light emitted by the light-emitting element 21 inside the first reflector cup 311 is emitted from the side gap of the reflector cup cover 30, and part of the light emitted from the edge region of the diffuser film 40 is emitted, thereby increasing the brightness of the edge region of the diffuser film 40. Part of the light emitted from the diffuser film 40 is emitted after one or more reflections between the first reflector wall 311a and the encapsulation housing 50, thereby increasing the light emission brightness of the edge region of the backlight module 200 and achieving uniform light emission brightness of the backlight module 10 as a whole.

[0044] Based on the above embodiments, refer to Figure 3 and Figure 4The encapsulation housing 50 includes a side region 51, the inner surface of which is planar, and the diffusion film 40 is not in contact with the inner surface of the side region 51. In this embodiment of the invention, the side region 51 of the encapsulation housing 50 can be a right-angled structure, and the diffusion film 40 is directly attached to the reflective cup 30, with no contact between the diffusion film 40 and the inner surface of the side region 51 of the encapsulation housing 50. The reflective cup 30 can be made of a robust material, providing a certain degree of support. This allows the side region 51 of the encapsulation housing 50 to be compressed towards the center, reducing the distance L' between the side region 51 of the encapsulation housing 50 and the light source substrate 20, thereby reducing the bezel thickness of the display module and achieving an ultra-narrow bezel design.

[0045] Figure 5 for Figure 2 A cross-sectional schematic diagram of a backlight module along the BB' direction, in some embodiments, referenced Figure 5 The inner surface of the side region 51 of the package housing 50 is a stepped surface M, along the direction perpendicular to the plane of the light source substrate 20. Figure 5 (As shown in the Z-direction), the diffusion film 40 overlaps with the stepped surface M of the side region 51. In this embodiment of the invention, the side region 51 of the encapsulation housing 50 can be designed as a stepped surface M, compressed towards the center. The diffusion film 40 and the stepped surface M of the side region 51 are in direct or indirect contact. The stepped surface M can play an auxiliary supporting role, preventing the entire weight of the diffusion film 40 from being concentrated on the reflective cup 30, thereby preventing the reflective cup 30 from collapsing. In this application, compressing the side region 51 of the encapsulation housing 50 inward helps to reduce the distance between the side region 51 of the encapsulation housing 50 and the light source substrate 20, reduce the thickness of the frame of the encapsulation housing 50, and achieve an extremely narrow frame.

[0046] It should be noted that the outer surface of the side area 51 of the packaging shell 50 is recessed inward to form a stepped surface M. The packaging shell 50 can be a one-piece die-cast structure, and its material can be aluminum alloy or other materials.

[0047] Continue to refer to Figure 5 A portion of the diffuser film 40, near the light-emitting element 21, contacts the stepped surface M of the side region 51. The height h1 of the stepped surface M of the side region 51 relative to the light source substrate 20 is greater than or equal to the height d2 of the second reflective wall 311b of the first reflective cup 311 relative to the light source substrate 20. In this embodiment, by reasonably controlling the height h1 of the stepped surface M of the side region 51 relative to the light source substrate 20, h1 ≥ d2. With the diffuser film 40 in direct contact with the reflective cup 30, a portion of the diffuser film 40 is directly rested on the stepped surface M of the side region 51. The stepped surface M provides auxiliary support for the diffuser film 40, preventing the reflective cup 30 from collapsing.

[0048] Figure 6 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction. Figure 7 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction. Figure 8 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction.

[0049] Based on the above embodiments, refer to Figures 6-8 The backlight module 200 also includes a reflective sheet 60, which at least partially covers the inner surface of the side region 51 and faces the light-emitting element 21 and the diffusion film 40. In this embodiment of the invention, the reflective sheet 60 can also be provided on the inner surface of the side region 51 of the encapsulation housing 50, facing the light-emitting element 21 and the diffusion film 40. For example, a silver film can be deposited on the inner surface of the side region 51 to increase the reflectivity of the inner surface of the side region 51. Some of the light rays S emitted from the side of the light-emitting element 21 leak out above the first reflective wall 311a of the first reflective cup 311, and some of the light rays S are emitted directly from the edge region of the diffusion film 40, increasing the brightness of the edge region of the diffusion film 40. Some of the light rays S are reflected back into the first reflective cup 311 by the reflective sheet 60, forming one or more reflections before reaching the diffusion film 40 and being emitted, increasing the light mixing of the outermost ring of light-emitting elements 21, thereby improving the luminous brightness of the edge region of the backlight module 200.

[0050] For example, refer to Figure 6 and Figure 7 The diffusion film 40 is not in contact with the side region 51 of the encapsulation housing 50. The reflective sheet 60 is attached to the inner surface of the side region 51 of the encapsulation housing 50. The height of the top of the reflective sheet 60 relative to the light source substrate 20 is greater than or equal to the height of the diffusion film 40 relative to the light source substrate 20. (Reference) Figure 8 Part of the diffuser film 40 is directly attached to the stepped surface M of the side region 51, and the reflective sheet 60 is attached to the sidewall of the stepped surface M on the inner surface of the side region 51 of the encapsulation housing 50. The height of the top of the reflective sheet 60 relative to the light source substrate 20 is less than or equal to the height of the diffuser film 40 relative to the light source substrate 20. In this way, light emitted from the gap between the first reflective wall 311a and the diffuser film 40, or light leaking from the end face of the diffuser film 40, can be completely reflected back to the diffuser film 40 before being emitted, reducing light leakage and increasing light utilization.

[0051] Figure 9 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction, based on the above embodiment, with reference to... Figure 9The reflective sheet 60 is attached to the stepped surface M of the side region 51 of the encapsulation housing 50, and a portion of the surface of the diffusion film 40 near the light-emitting element 21 contacts the reflective sheet 60 on the stepped surface M of the side region 51. In an embodiment of the invention, the reflective sheet 60 can also cover the inner sidewall of the side region 51 of the encapsulation housing 50, and the diffusion film 40 overlaps the stepped surface M of the side region 51 of the encapsulation housing 50. In this way, the reflective sheet 60 reflects the light S emitted from the gap between the first reflective wall 311a and the diffusion film 40, as well as the light leaking from the side of the diffusion film 40, towards the edge region of the diffusion film 40, thereby increasing the brightness of the edge region of the diffusion film 40 and ultimately improving the luminous brightness of the edge region of the backlight module 200.

[0052] Optional, see reference Figure 9 Along the stepped surface M shape of the side region 51 of the encapsulation housing 50, the reflective sheet 60 is shaped like a Z. This arrangement can cover the stepped surface M, increase the area of ​​the reflective sheet 60 in the side region 51, increase the reflection of the light emitted laterally from the light-emitting element 21 in the side region 51, improve the brightness of the edge region of the diffusion film 40, and improve the light emission brightness of the edge region of the backlight module 200.

[0053] Figure 10 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction, for reference. Figure 10 The surface of the reflector 60 facing the light-emitting element 21 and the diffuser film 40 is inclined, and the bottom angle β is an acute angle. In other words, along... Figure 10 In the Z-direction, the reflective surface of the reflective sheet 60 can also be designed as an inclined surface, facing the light-emitting element 21 and the diffuser film 40. This surface can reflect light S towards the side area of ​​the diffuser film 40, increasing the light intensity in the side area and further enhancing its brightness. The bottom angle β can be adjusted according to the actual reflection angle. The bottom of the reflective sheet 60 can rest on the light source substrate 20 to improve its stability.

[0054] It should be noted that in other embodiments of the present invention, the surface of the reflective sheet 60 facing the light-emitting element 21 and the diffusion film 40 may be designed as an inclined surface to reflect more light toward the side area of ​​the diffusion film 40, thereby increasing the brightness of the side area of ​​the diffusion film 40. These embodiments of the present invention will not be shown one by one.

[0055] Figure 11 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction. Figure 12 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction. Figure 13 for Figure 2A cross-sectional schematic diagram of another backlight module along the BB' direction, based on the above embodiment, with reference to... Figures 11-13 The backlight module 200 also includes a light guide plate 70, which is located between the light source substrate 20 and the side region 51, and the light guide surface of the light guide plate 70 near the light-emitting element 21 is in contact with the first reflective wall 311a of the first reflective cup 311.

[0056] In this embodiment of the invention, the light guide plate 70 is disposed between the first reflective wall 311a of the first reflective cup 311 and the side region 51. Part of the light S emitted from the light-emitting element 21 is guided by the light guide plate 70 to the side region 51 of the encapsulation housing 50, and after being reflected by the side region 51 to the edge region of the diffusion film 40, it is emitted, thereby increasing the brightness of the edge region of the diffusion film 40. At the same time, it can also increase the optical path of this part of the light and improve the light mixing distance, thereby improving the luminous brightness of the edge region of the backlight module 200 and improving the brightness uniformity of the backlight module 200.

[0057] Furthermore, the light guide plate 70 can also serve to support the diffusion film 40. For example, refer to... Figure 11 The diffusion film 40 does not contact the side region 51 of the encapsulation housing 50. With the diffusion film 40 in direct contact with the reflective cup 30, the light guide plate 70 is disposed on the encapsulation housing 50, located between the first reflective wall 311a of the first reflective cup 311 and the side region 51 of the encapsulation housing 50, and in contact with the diffusion film 40. (Reference) Figure 12 The reflector 60 is attached to the inner surface of the side region 51 of the encapsulation housing 50. With the diffusion film 40 in direct contact with the reflective cup 30, the light guide plate 70 is disposed on the light source substrate 20. The light guide surface of the light guide plate 70 near the light-emitting element 21 contacts the first reflective wall 311a of the first reflective cup 311, while the light guide surface of the light guide plate 70 away from the light source substrate 20 contacts the diffusion film 40. (Reference) Figure 13 The reflective sheet 60 is attached to the inner surface of the side region 51 of the encapsulation housing 50, and part of the diffusion film 40 is directly attached to the reflective sheet 60 of the stepped surface M. The light guide plate 70 has its light guide surface near the light-emitting element 21 in contact with the first reflective wall 311a of the first reflective cup 311, and its light guide surface away from the light source substrate 20 in contact with the diffusion film 40. With this arrangement, the light guide plate 70 can help support the diffusion film 40 and prevent the reflective cup 30 from collapsing.

[0058] Figure 14 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction is shown below, based on the above embodiment, with reference to... Figure 14The inner surface of the side region 51 is a stepped surface M; the light guide plate 70 is located between the diffusion film 40 and the stepped surface M of the side region 51, and a reflective sheet 60 is disposed on the end face of the light guide plate 70 away from the reflector cup 31. In this embodiment of the invention, the light guide plate 70 is disposed on the stepped surface M of the side region 51, part of the diffusion film 40 is directly attached to the light guide plate 70, and the reflective sheet 60 is attached to part of the inner surface of the side region 51 of the encapsulation housing 50. The light guide surface of the light guide plate 70 near the light-emitting element 21 is in contact with the first reflective wall 311a of the first reflector cup 311, and the light guide surface of the light guide plate 70 away from the light source substrate 20 is in contact with the diffusion film 40. The light guide plate 70 is disposed in the gap between the first reflective wall 311a of the first reflector cup 311 and the diffusion film 40, which can improve the utilization rate of light transmitted through the light guide plate 70 and reduce light loss.

[0059] Among them, reference Figure 14 To prevent the light guide plate 70 from moving, it can also be glued and fixed to the stepped surface M to avoid it from moving or falling off.

[0060] It should be noted that the embodiments of the present invention are attached. Figures 4-14 The number of reflections and direction of the light beam S are only illustrative examples. In actual applications, since there is a gap between the first reflective wall 311a of the first reflective cup 311 and the diffusion film 4, at least part of the light emitted from the side of the light-emitting element 21 or the light reflected by the reflective wall of the first reflective cup 311 passes through the gap and is reflected by the side area 51 of the encapsulation housing 50 to the edge area of ​​the diffusion film 40 before being emitted. This increases the brightness of the edge area of ​​the diffusion film 40 and enhances the luminous brightness of the edge area of ​​the display module.

[0061] Based on the above embodiments, refer to Figure 2 The encapsulation housing 50 includes a first side 51a, a second side 51b, a third side 51c, and a fourth side 51d. The first side 51a and the third side 51c are opposite each other, and the second side 51b and the fourth side 51d are opposite each other. The distance between the end face of the light source substrate 20 at the first side 51a and the outer side of the encapsulation housing 50 is greater than the distance between the end face of the light source substrate 20 at the second side 51b, the third side 51c, and the fourth side 51d. In other words, the frame width of the first side 51a of the encapsulation housing 50 can be designed to be greater than the frame widths of the second side 51b, the third side 51c, and the fourth side 51d.

[0062] For example, the inner surfaces of the second side 51b, the third side 51c, and the fourth side 51d can be designed as stepped surfaces, the inner surface of the first side 51a can be a right-angled structure, the second side 51b, the third side 51c, and the fourth side 51d of the package housing 50 can be designed as extremely narrow bezels, and power chips, driver chips, and other devices can be packaged in the first side 51a.

[0063] Figure 15 for Figure 2 A cross-sectional schematic diagram of another backlight module along the BB' direction, based on the above embodiment, with reference to... Figure 2 At positions 51b, 51c, and 51d, the distance between the end face of the light source substrate 20 and the outer side of the encapsulation housing 50 is the same. In this embodiment of the invention, the second side 51b, third side 51c, and fourth side 51d of the encapsulation housing 50 are designed as extremely narrow borders with the same width.

[0064] For example, refer to Figure 15 Taking the fourth side 51d position as an example, the distance between the end face of the light source substrate 20 and the outer side of the package shell 50 is calculated. The distance D between the end face of the light source substrate 20 and the outer side of the package shell 50 satisfies: D=F+G+H+J.

[0065] Where F is the distance between the light source substrate 20 and the inner surface of the packaging housing 50. G is the overlap length between the diffusion film 40 and the inner surface of the packaging housing 50. H is the distance between the diffusion film 40 and the inner surface of the packaging housing 50, and J is the distance between the inner and outer surfaces of the packaging housing 50.

[0066] For example, the diameter (D) of the encapsulation housing 50 at the second side 51b, third side 51c, and fourth side 51d is set to 4.5mm, and the diameter (D) at the first side 51a is set to 6.2mm. It should be noted that in this embodiment of the invention, F+G+H+J does not have a precise ratio or numerical relationship and can be adjusted according to actual needs to achieve an extremely narrow bezel design for the backlight module 200.

[0067] Based on the above embodiments, refer to Figures 2-15At least one beam-splitting film 80 comprises two stacked beam-splitting films, a first beam-splitting film and a second beam-splitting film, with identical optical parameters. These optical parameters refer to the beam-splitting wavelength, transmittance-to-reflectance ratio, light intensity beam splitting ratio, polarization beam splitting ratio, etc., of the beam-splitting film 80. This can also be understood as the first and second beam-splitting films having completely identical structures and optical properties. In this embodiment of the invention, using beam-splitting films 80 with identical parameters allows for random refraction of light. The first and second beam-splitting films sequentially disperse the light, enhancing the light diffusion effect and achieving better light mixing, thereby improving the uniformity of the display module's brightness.

[0068] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 16 This is a schematic diagram of a display device provided in an embodiment of the present invention, with reference to... Figure 16 The display device 300 includes a backlight module 200 and a display panel 400 as provided in the above embodiments. The backlight module 200 provides a light source for the display panel 400, which includes a liquid crystal display panel. The structure of the display panel 400 is not described in detail in this embodiment. Therefore, this display device also has the beneficial effects of the backlight module in the above embodiments. The similarities can be understood by referring to the explanation of the backlight module above, and will not be repeated below.

[0069] The display device 300 provided in this embodiment of the invention can be Figure 16 The mobile phone shown can also be any electronic product with display function, including but not limited to the following categories: television, laptop, desktop monitor, tablet computer, digital camera, smart bracelet, smart glasses, in-vehicle display, industrial control equipment, medical display screen, touch interactive terminal, etc. The embodiments of the present invention do not make any special limitations on this.

[0070] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A backlight module, characterized in that, include: A light source substrate, comprising multiple light-emitting elements arranged in an array; A reflective cup is located on the side of the light source substrate where the light-emitting elements are arranged; The reflective cup cover includes a plurality of interconnected reflective cups, each reflective cup having an opening at its center, at least one of the light-emitting elements being located within the opening, and the reflective walls of the reflective cups surrounding the light-emitting elements; A diffusion film is located on the side of the reflective cup away from the light source substrate, and at least part of the reflective cup is in contact with the diffusion film; At least one beam-splitting film is located on the side of the diffusion film away from the light source substrate; The packaging housing contains the light source substrate, the reflective cup, the diffusion film, and the beam-splitting film, all of which are located within the area defined by the packaging housing. The reflective cup includes a first reflective cup and a second reflective cup; the first reflective cup surrounds the second reflective cup and is located in the edge region of the reflective cup cover; The first reflective cup includes a first reflective wall and a second reflective wall, wherein the first reflective wall is close to the edge region of the reflective cup cover, and the second reflective wall is away from the edge region of the reflective cup cover; The first reflective wall is not in contact with the diffusion film; Along the direction perpendicular to the plane where the light source substrate is located, the height of the first reflective wall is less than the height of the second reflective wall; or, the height of the first reflective wall is less than the height of the reflective wall of the second reflective cup, so that there is a gap between the first reflective wall and the diffusion film.

2. The backlight module of claim 1, wherein, The encapsulation housing includes a side region, the inner surface of which is planar, and the diffusion film has no contact with the inner surface of the side region; or... The inner surface of the side region is a stepped surface; along the direction perpendicular to the plane where the light source substrate is located, the diffusion film overlaps with the stepped surface of the side region.

3. The backlight module of claim 2, wherein, A portion of the diffusion film's surface near the light-emitting element contacts the stepped surface of the side region, and the height of the stepped surface of the side region relative to the light source substrate is equal to the height of the reflective cup relative to the light source substrate.

4. The backlight module of claim 2, wherein, It also includes reflective sheets; The reflective sheet at least partially covers the inner surface of the side region and faces the light-emitting element and the diffusion film.

5. The backlight module of claim 4, wherein, The reflective sheet is attached to the stepped surface of the side region, and a portion of the surface of the diffusion film near the light-emitting element contacts the reflective sheet on the stepped surface of the side region.

6. The backlight module according to claim 5, wherein the reflective sheet is Z-shaped.

7. The backlight module according to claim 4, wherein the surface of the reflective sheet facing the light-emitting element and the diffuser film is inclined and the bottom angle is acute.

8. The backlight module according to claim 4, characterized in that, It also includes a light guide plate; The light guide plate is located between the light source substrate and the side area, and the light guide surface of the light guide plate near the light-emitting element is in contact with the first reflective wall of the first reflective cup.

9. The backlight module according to claim 8, characterized in that, The inner surface of the side region is a stepped surface; The light guide plate is located between the diffusion film and the stepped surface of the side region; and the reflective sheet is disposed on the end face of the light guide plate away from the reflective cup.

10. The backlight module according to claim 2, characterized in that, The encapsulation housing includes a first side, a second side, a third side, and a fourth side; the first side and the third side are opposite to each other, and the second side and the fourth side are opposite to each other; The distance between the end face of the light source substrate at the first side and the outer side of the packaging shell is greater than the distance between the end face of the light source substrate and the outer side of the packaging shell at the second side, the third side, and the fourth side.

11. The backlight module according to claim 10, characterized in that, At the second, third, and fourth side positions, the distance between the end face of the light source substrate and the outer side of the packaging shell is the same.

12. The backlight module according to claim 1, characterized in that, The at least one layer of the beam splitter includes two stacked beam splitters, a first beam splitter and a second beam splitter, wherein the first beam splitter and the second beam splitter have the same optical parameters.

13. A display device, characterized in that, Includes the backlight module as described in any one of claims 1 to 12.

Images