Backlight module and display device

Abstract

The present application provides a backlight module, which includes: a back plate; a light guide plate, which is carried by the back plate, and the light guide plate has a light emitting surface and a first hole whose opening is at least located at the light emitting surface, and the light emitting surface is used to emit light; an optical film, which is arranged on the side of the light guide plate away from the back plate, and the optical film has a light incident surface, which is arranged adjacent to the light incident surface and is used to receive the light emitted by the light guide plate, and the optical film has a second hole that penetrates the light incident surface and a surface arranged opposite to the light incident surface; and a rubber frame, which is partially arranged on the side of the optical film away from the light guide plate, and is used to cooperate with the back plate to accommodate and fix the light guide plate and the optical film; wherein the rubber frame or the back plate includes a limiting portion, and the limiting portion is at least partially accommodated in the first hole and the second hole to limit the light guide plate and the optical film, which can effectively prevent the light guide plate and the optical film from being misaligned when shaking, thereby effectively improving the reliability of the backlight module.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] As one of the key components of the LCD panel, the backlight module provides sufficient brightness and evenly distributed light source for the LCD panel to display images normally. The reliability of the backlight module directly affects the quality of the display device. With the development of display technology, the application scenarios of LCD panels are gradually expanding. For the automotive display field, since the LCD panel has a lot of vibration during use, there are higher requirements for the structural vibration reliability test and shaking sound problems of the backlight module.

[0003] The backlight module is mainly composed of a light source, a reflector, a light guide plate, an optical film, a plastic frame and a back plate. In order to meet the structural reliability of the backlight module, the current design usually uses double-sided tape to fix all optical films on the light guide plate, the light guide plate is fixed on the reflector through double-sided tape, and the reflector is attached to the back plate through double-sided tape. This design has the following disadvantages: the use of double-sided tape will affect the optical effect of the backlight module, causing the LCD panel to have uneven display problems such as dark shadows; there is no alignment reference in the process of attaching double-sided tape to the optical film, and the size of the double-sided tape is usually small, which is not easy to operate and increases the operation time; the optical film is fixed with double-sided tape, and there is no reworkability. Once the optical film is bonded with double-sided tape, if it is found that the alignment is inaccurate or rework is required, the position where the optical film and the double-sided tape are bonded will be wrinkled, making the optical film unable to be reused. Summary of the invention

[0004] In a first aspect, the present invention provides a backlight module, the backlight module comprising:

[0005] Back panel;

[0006] A light guide plate, the light guide plate is carried by the back plate, the light guide plate has a light emitting surface and an opening at least located at a first hole of the light emitting surface, and the light emitting surface is used for emitting light;

[0007] an optical film, the optical film being disposed on a side of the light guide plate away from the back plate, the optical film having a light incident surface, the light incident surface being disposed adjacent to the light emitting surface and being used to receive light emitted by the light guide plate, the optical film having a second hole penetrating the light incident surface and a surface disposed opposite to the light incident surface; and

[0008] A plastic frame, wherein the plastic frame portion is disposed on a side of the optical film away from the light guide plate, and is used to cooperate with the back plate to accommodate and fix the light guide plate and the optical film;

[0009] Wherein, the plastic frame or the back plate includes a limiting portion, and the limiting portion is at least partially received in the first hole and the second hole to limit the light guide plate and the optical film.

[0010] Wherein, the limiting part comprises:

[0011] a first sub-limiting portion, wherein the first sub-limiting portion is at least partially received in the first hole and is made of a transparent material; and

[0012] The second sub-limiting portion is at least partially received in the second hole, and the second sub-limiting portion is made of a transparent material, and the material of the second sub-limiting portion is different from that of the first sub-limiting portion.

[0013] Among them, the material of the first sub-limiting part includes at least one of polycarbonate and polymethyl methacrylate; the material of the second sub-limiting part is transparent rubber, and the hardness of the transparent rubber is: 40~60A; and the second sub-limiting part is doped with multiple reflective particles, and the multiple reflective particles are used to reflect the light incident to the second sub-limiting part.

[0014] Among them, the rubber frame includes a frame body and the limiting part, one end of the limiting part is fixedly connected to the frame body, and the first hole is a blind hole; the first sub-limiting part has a length range H1, and the light guide plate has a thickness range H2, and the length range H1 of the first sub-limiting part and the thickness range H2 of the light guide plate satisfy: H2>H1≥H2×0.5.

[0015] Among them, the back panel includes a back panel body and the limiting portion, one end of the limiting portion is fixedly connected to the back panel body, the first hole is a through hole, and passes through the light-emitting surface of the light guide plate and the surface opposite to the light-emitting surface, and the back panel has a groove, the groove is exposed and arranged on a side of the back panel adjacent to the light guide plate, and the limiting portion is at least partially accommodated in the groove of the back panel.

[0016] The groove has a depth range H3, the back plate has a thickness range H4, and the relationship between the depth range H3 of the groove and the thickness range H4 of the back plate satisfies: H3≤H4×0.4.

[0017] The light emitting surface includes a first side, a second side and a third side, the first side is arranged opposite to the second side, one end of the third side is connected to the first side in a bending manner, and the other end of the third side is connected to the second side in a bending manner;

[0018] The limiting portion is disposed adjacent to the third side, and a gap is provided between the limiting portion and the third side;

[0019] The number of the limiting parts is at least two, one of the limiting parts is arranged adjacent to the first side, and a gap is formed between the limiting part and the first side, and the other of the limiting parts is arranged adjacent to the second side, and a gap is formed between the limiting part and the second side.

[0020] The third side has a center line passing through the center position of the third side, and the center line is coplanar with the light emitting surface;

[0021] The number of the limiting parts is at least three, and another one of the limiting parts is arranged at the position where the center line is located.

[0022] The rubber frame includes a raised portion, the raised portion is arranged on a side of the frame body adjacent to the optical film, and a distance range D1 is provided between the raised portion and the optical film, and the distance range D1 satisfies: 0.2mm≤D1≤0.4mm.

[0023] In a second aspect, the present invention further provides a display device, comprising a display panel and a backlight module as described above, wherein the backlight module is arranged on one side of the display panel and is used to provide a surface light source for the display panel.

[0024] The limiting portion of the embodiment of the present application runs through the optical film and the light guide plate, replacing the double-sided tape to limit the optical film and the light guide plate on the left and right, thereby not affecting the optical effect of the backlight module, avoiding display unevenness problems such as dark shadows, and making it easy to align the optical film and the light guide plate during installation, reducing the operation time. The limiting portion can effectively prevent the light guide plate and the optical film from being misaligned when the display device used in the backlight module shakes by limiting and fixing the optical film and the light guide plate, thereby effectively improving the reliability of the backlight module and making the backlight module have stable optical performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the structure of a display device according to an embodiment of the present application.

[0027] Figure 2 yes Figure 1 A partial structural schematic diagram of a cross section of a display device along line AA is provided.

[0028] Figure 3 It is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application.

[0029] Figure 4 It is a partial structural schematic diagram of the cross section of the display device along line AA of a comparative embodiment of the present application.

[0030] Figure 5 It is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application.

[0031] Figure 6 It is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application.

[0032] Figure 7 It is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application.

[0033] Figure 8 It is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application.

[0034] Fig. 9 yes Figure 2 A partial enlarged view of the cross-sectional structure of the display device provided in .

[0035] Fig.10 It is a schematic diagram of the top structure of the backlight module of the embodiment of the present application.

[0036] Fig.11 It is a schematic diagram of the top structure of the backlight module of the embodiment of the present application.

[0037] Description of reference numerals:

[0038] 1-display device, 10-backlight module, 20-display panel, 11-back plate, 12-light guide plate, 13-optical film, 14-glue frame, 15-limiting part, 16-light-emitting unit, 17-reflecting plate, 18-double-sided tape, 111-back plate body, 112-groove, 121-light emitting surface, 122-first hole, 131-light incident surface, 132-second hole, 141-frame body, 142-raised part, 151-first sub-limiting part, 152-second sub-limiting part, 1211-first side, 1212-second side, 1213-third side, 121a-center line, 1521-reflective particles. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0041] Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 is a schematic diagram of the structure of a display device according to an embodiment of the present application, Figure 2 yes Figure 1 A partial structural schematic diagram of a cross section of a display device along line AA provided in FIG. Figure 3 is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application, Figure 4It is a partial structural schematic diagram of the cross section of the display device along the AA line of the comparative embodiment of the present application. The backlight module 10 of the embodiment of the present invention includes a back plate 11, a light guide plate 12, an optical film 13 and a rubber frame 14. The light guide plate 12 is carried on the back plate 11, and the light guide plate 12 has a light emitting surface 121 and a first hole 122 with an opening at least located on the light emitting surface 121, and the light emitting surface 121 is used to emit light. The optical film 13 is arranged on the side of the light guide plate 12 away from the back plate 11, and the optical film 13 has a light incident surface 131, and the light incident surface 131 is arranged adjacent to the light emitting surface 121 and is used to receive the light emitted by the light guide plate 12, and the optical film 13 has a second hole 132 that passes through the light incident surface 131 and the surface arranged opposite to the light incident surface 131. The plastic frame 14 is partially disposed on a side of the optical film 13 away from the light guide plate 12, and is used to cooperate with the back plate 11 to accommodate and fix the light guide plate 12 and the optical film 13. The plastic frame 14 or the back plate 11 includes a limiting portion 15, and the limiting portion 15 is at least partially accommodated in the first hole 122 and the second hole 132 to limit the light guide plate 12 and the optical film 13.

[0043] The backlight module 10 provided in this embodiment can be, but is not limited to, applied to a thin film transistor liquid crystal display (TFT-LCD), a sub-millimeter light emitting diode (Mini Light Emitting Diode, Mini LED) display, or a micro light emitting diode (Micro Light Emitting Diode, Micro LED) display, etc. It can be understood that the backlight module 10 can also be applied to other display devices 1, and the application scenario of the backlight module 10 should not be a limitation on the backlight module 10 provided in this embodiment. The backlight module 10 can be, but is not limited to, a direct-type or side-entry backlight module 10. The direct-type backlight module 10 is to set a light source (such as a cathode fluorescent lamp (CCFL) or a light emitting diode (LED)) behind the liquid crystal panel to directly form a surface light source to provide to the liquid crystal panel. The side-entry backlight module 10 is a backlight light bar arranged at the edge of the back plate 11 behind the side of the liquid crystal panel. The light emitted by the light bar enters the light guide plate 12, and after reflection and diffusion, it is emitted from the light emitting surface 121 of the light guide plate 12, and then passes through the optical film 13 to form a surface light source to provide to the liquid crystal panel. In the schematic diagram of the embodiment of the present application, the side-entry backlight module 10 is used as an example for illustration. The process manufacturing cost of the side-entry backlight module 10 is relatively low and at the same time, a relatively thin display device 1 body can be created. The backlight module 10 provided in this embodiment includes a back plate 11, a light guide plate 12, an optical film 13 and a rubber frame 14. The backlight module 10 may be, but is not limited to, other components such as a light-emitting unit 16 and a reflective plate 17. It can be understood that the other components of the backlight module 10 should not be a limitation on the backlight module 10 provided in this embodiment.

[0044] The material of the back plate 11 may be but is not limited to metal, plastic, or other composite materials, etc. It is understandable that the material of the back plate 11 should not be a limitation on the backlight module 10 provided in this embodiment. The back plate 11 may be but is not limited to being used to accommodate and carry the light guide plate 12 and the optical film 13, etc.

[0045] The light emitting unit 16 of the backlight module 10 may be, but is not limited to, a light source provided in the backlight module 10. The light emitting unit 16 may be, but is not limited to, a light emitting diode (LED) lamp bead. The number of the light emitting units 16 may be, but is not limited to, multiple, and the light emitting unit 16 may be, but is not limited to, carried on the back plate 11.

[0046] The material of the light guide plate 12 may be, but is not limited to, polycarbonate (PC), polymethyl methacrylate (PMMA), or silicone material, etc. It is understandable that the light guide plate 12 may also be composed of other materials, and the material of the light guide plate 12 should not be a limitation on the backlight module 10 provided in this embodiment. The light guide plate 12 has a light emitting surface 121, and the light emitting surface 121 may be, but is not limited to, a plane or a design that is approximately plane. The shape of the light emitting surface 121 may be, but is not limited to, a rectangular, square, circular, or other irregular shapes, and it is understandable that the shape of the light emitting surface 121 should not be a limitation on the backlight module 10 provided in this embodiment. The light guide plate 12 may be, but is not limited to, a light guide point prepared by laser engraving or other process forms (not shown in the figure), and after the light emitted by the light emitting unit 16 is incident on the light guide plate 12, the light guide point of the light guide plate 12 may be used to diffuse the light, and then the light is emitted through the light emitting surface 121 of the light guide plate 12. The light guide plate 12 can be, but is not limited to, a device for converting a linear light source in the backlight module 10 into a surface light source.

[0047] The light guide plate 12 is carried on the back plate 11. The light guide plate 12 may be, but not limited to, arranged to fit the back plate 11, so as to reduce the shaking of the light guide plate 12 during the actual product application, and the heat of the light guide plate 12 may be dissipated through the back plate 11 for heat dissipation. The backlight module 10 may be, but not limited to, arranged with a reflector 17 on the side of the light guide plate 12 adjacent to the back plate 11. The reflector 17 may be, but not limited to, reflecting the light exposed from the bottom surface of the backlight module 10 back to the light guide plate 12 to improve the light use efficiency. In the schematic diagram of the present embodiment, the reflector 17 is arranged between the light guide plate 12 and the back plate 11 as an example for illustration. It can be understood that the arrangement of the reflector 17 should not be a limitation on the backlight module 10 provided in the present embodiment.

[0048] The light guide plate 12 has a first hole 122 whose opening is at least located at the light emitting surface 121. The shape design of the first hole 122 can be, but is not limited to, a cylinder, an elliptical cylinder, or a cuboid. It can be understood that the shape design of the first hole 122 should not be a limitation on the backlight module 10 provided in this embodiment. The processing method of the first hole 122 can be, but is not limited to, first preparing a blank of the light guide plate 12, and then processing and preparing it on the blank of the light guide plate 12 by laser etching or other process forms. The processing method of the first hole 122 can also be an integral molding process during the preparation of the light guide plate 12. It can be understood that the first hole 122 can also be prepared by other process flows, and the processing method and process flow of the first hole 122 should not be a limitation on the backlight module 10 provided in this embodiment. The opening of the first hole 122 is at least located at the light emitting surface 121 of the light guide plate 12. Specifically, the first hole 122 can be, but is not limited to, a blind hole ( Figure 2 ) or through hole ( Figure 3 ), when the first hole 122 is a blind hole, the opening of the first hole 122 is located on the light exit surface 121 of the light guide plate 12, and the depth range of the first hole 122 is smaller than the thickness range of the light guide plate 12, that is, the first hole 122 is not set through the light guide plate 12. When the first hole 122 is a through hole, the first hole 122 has two openings, one opening of the first hole 122 is located on the light exit surface 121 of the light guide plate 12, and the other opening of the first hole 122 is located on the surface of the light guide plate 12 away from the light exit surface 121, that is, the first hole 122 is set through the light guide plate 12.

[0049] The optical film 13 may be but is not limited to including a diffusion film and an incremental film, wherein the diffusion film in the optical film 13 may be but is not limited to adding chemical particles as scattering particles in the diffusion film substrate, so that the backlight module 10 can provide a uniform surface light source, and the incremental film of the optical film 13 may be but is not limited to being used to improve light transmittance and increase brightness. It can be understood that the optical film 13 may be but is not limited to also including other optical functional film layers, or the optical film 13 may also be a combination of multiple optical functional film layers and an integrated arrangement. The specific composition of the optical film 13 should not be a limitation on the backlight module 10 provided in this embodiment.

[0050] The optical film 13 is arranged on the side of the light guide plate 12 away from the back plate 11. The optical film 13 can be, but not limited to, arranged to fit the light guide plate 12. The light incident surface 131 can be, but not limited to, a plane or a substantially plane. The shape of the light incident surface 131 can be, but not limited to, the light incident surface 131 of the optical film 13 can be, but not limited to, a rectangular, square, circular, or other irregular shapes. It can be understood that the shape of the light incident surface 131 should not be a limitation on the backlight module 10 provided in this embodiment. The light incident surface 131 is arranged adjacent to the light emitting surface 121 and is used to receive the light emitted by the light guide plate 12. The light incident surface 131 of the optical film 13 can be but is not limited to being arranged to be attached to the light emitting surface 121 of the light guide plate 12. In the schematic diagram of the present embodiment, the light incident surface 131 of the optical film 13 is attached to the light emitting surface 121 of the light guide plate 12 as an example for illustration, so that the light emitted by the light guide plate 12 can be directly incident on the light incident surface 131 of the optical film 13 via the light emitting surface 121 of the light guide plate 12, thereby reducing the loss of light and improving the utilization efficiency of light, and can also enable the backlight module 10 to have a uniform and excellent optical effect.

[0051] The optical film 13 has a second hole 132 that passes through the light incident surface 131 and the surface opposite to the light incident surface 131, that is, the second hole 132 is a through hole that passes through the optical film 13. The shape design of the second hole 132 can be, but is not limited to, a cylinder, an elliptical cylinder, or a cuboid. It can be understood that the shape design of the second hole 132 should not be a limitation on the backlight module 10 provided in this embodiment. The processing method of the second hole 132 can be, but is not limited to, first preparing the blank layer of the optical film 13, and then processing and preparing the blank layer of the optical film 13 by laser etching or other process forms. The processing method of the second hole 132 can also be an integral molding process during the preparation of the optical film 13. It can be understood that the second hole 132 can also be prepared by other process flows. The processing method and preparation process flow of the second hole 132 should not be a limitation on the backlight module 10 provided in this embodiment.

[0052] The material of the plastic frame 14 may be, but is not limited to, organic plastic, such as polycarbonate resin (PC), etc. The plastic frame 14 may be, but is not limited to, partially disposed on the side of the optical film 13 away from the light guide plate 12, and the plastic frame 14 may be, but is not limited to, partially disposed on the side of the light emitting unit 16 away from the light guide plate 12, so that the plastic frame 14 can form a receiving space together with the back plate 11, and is used to cooperate with the back plate 11 to receive and fix the light guide plate 12, the optical film 13, and the light emitting unit 16, etc.

[0053] The plastic frame 14 or the back plate 11 includes a limiting portion 15. Specifically, the limiting portion 15 can be arranged on the plastic frame 14 ( Figure 2 ) or on the back plate 11 ( Figure 3 ). The limiting portion 15 may be, but is not limited to, prepared on the back panel 11 and the rubber frame 14 by injection molding or other process forms. It can be understood that the process form of the limiting portion 15 should not be a limitation on the backlight module 10 provided in this embodiment. The limiting portion 15 may be, but is not limited to, being prepared separately after preparing the rubber frame 14 or the back panel 11. The limiting portion 15 may also be processed and prepared together during the preparation of the rubber frame 14 or the back panel 11, that is, the limiting portion 15 may be, but is not limited to, being integrally formed with the rubber frame 14 or the back panel 11. The limiting portion 15 is at least partially accommodated in the first hole 122 and the second hole 132 to limit the light guide plate 12 and the optical film 13. Compared with the traditional design, the light guide plate 12 and the optical film 13 are bonded by double-sided tape 18 ( Figure 4 ), the limiting portion 15 of the embodiment of the present application passes through the optical film 13 and the light guide plate 12, replacing the double-sided tape 18 to limit the optical film 13 and the light guide plate 12 to the left and right, thereby not affecting the optical effect of the backlight module 10, avoiding display unevenness problems such as dark shadows, and making it easy to align the optical film 13 and the light guide plate 12 during installation, reducing the operation time, and the limiting portion 15 can effectively prevent the light guide plate 12 and the optical film 13 from being misaligned when the display device 1 used in the backlight module 10 shakes by limiting and fixing the optical film 13 and the light guide plate 12, thereby effectively improving the reliability of the backlight module 10 and making the backlight module 10 have stable optical performance.

[0054] Please refer again Figure 2 and Figure 3The limiting portion 15 includes a first sub-limiting portion 151 and a second sub-limiting portion 152. The first sub-limiting portion 151 is at least partially received in the first hole 122, and the first sub-limiting portion 151 is made of a transparent material. The second sub-limiting portion 152 is at least partially received in the second hole 132, and the second sub-limiting portion 152 is made of a transparent material, and the material of the second sub-limiting portion 152 is different from that of the first sub-limiting portion 151.

[0055] Please refer again Figure 2 and Figure 3 The first sub-limiting portion 151 is at least partially received in the first hole 122. When the limiting portion 15 is connected to the plastic frame 14 ( Figure 2 ), the first sub-limiting portion 151 may be, but is not limited to, received in the first hole 122. When the limiting portion 15 is connected to the back plate 11 ( Figure 3 ), the first sub-limiting portion 151 is partially received in the first hole 122. The first sub-limiting portion 151 may be, but is not limited to, made of a transparent material, so that light can penetrate the first sub-limiting portion 151, so that the propagation of light in the first sub-limiting portion 151 is not affected. Preferably, the material of the first sub-limiting portion 151 may be consistent with that of the light guide plate 12, so that when light is incident from the light guide plate 12 to the first sub-limiting portion 151, it can still be reflected and propagated normally.

[0056] The second sub-limiting portion 152 is at least partially received in the second hole 132. The second sub-limiting portion 152 may be, but is not limited to, made of a transparent material, so that light can penetrate the second sub-limiting portion 152, so that the propagation of light in the second sub-limiting portion 152 is not affected. Preferably, the material of the second sub-limiting portion 152 may be consistent with the material of the optical film layer, so that when light is incident from the light guide plate 12 to the second sub-limiting portion 152, it can still be reflected and propagated normally.

[0057] The material of the second sub-limiting portion 152 is different from the material of the first sub-limiting portion 151. Preferably, the material of the second sub-limiting portion 152 is consistent with or similar to the material of the optical film 13, and the material of the first sub-limiting portion 151 is consistent with or similar to the light guide plate 12, so that the second sub-limiting portion 152 will not affect the optical performance of the position where the optical film 13 is located, and the first sub-limiting portion 151 will not affect the optical performance of the position where the light guide plate 12 is located.

[0058] Please refer again Figure 2 and Figure 3The material of the first sub-limiting portion 151 includes at least one of polycarbonate and polymethyl methacrylate; the material of the second sub-limiting portion 152 is transparent rubber, and the hardness of the transparent rubber is: 40~60A; and the second sub-limiting portion 152 is doped with a plurality of reflective particles 1521, and the plurality of reflective particles 1521 are used to reflect the light incident to the second sub-limiting portion 152.

[0059] The first sub-limiting portion 151 is made of a transparent material, and the material of the first sub-limiting portion 151 is consistent with or similar to the material of the light guide plate 12. The material of the light guide plate 12 may be but is not limited to polycarbonate (PC) and polymethyl methacrylate (PMMA), and the material of the first sub-limiting portion 151 may also be but is not limited to polycarbonate (PC) and polymethyl methacrylate (PMMA). For example, when the material of the light guide plate 12 is polycarbonate (PC), the material of the first sub-limiting portion 151 is also polycarbonate (PC); when the material of the light guide plate 12 is polymethyl methacrylate (PMMA), the material of the second sub-limiting portion 152 is also polymethyl methacrylate (PMMA).

[0060] The second sub-limiting portion 152 is made of transparent material, and the material of the second sub-limiting portion 152 is consistent with or similar to the material of the optical film 13 . The material of the second sub-limiting portion 152 may be but is not limited to transparent rubber material, so as to cooperate with the optical film 13 .

[0061] The hardness of the second sub-limiting portion 152 may be, but is not limited to, 40A, 50A, or 60A. It is understandable that the hardness of the second sub-limiting portion 152 may also be other values, as long as the hardness of the second sub-limiting portion 152 is within the range of 40 to 60A. Preferably, the hardness of the second sub-limiting portion 152 is 50A. The hardness of the second sub-limiting portion 152 is within the range of 40 to 60A, thereby preventing the second sub-limiting portion 152 from having too low a hardness, which may result in insufficient support strength at the second sub-limiting portion 152 or easy deformation, and preventing the second sub-limiting portion 152 from having too high a hardness and being easy to crack, or causing the optical film 13 to have wrinkles due to the excessive hardness of the second sub-limiting portion 152 when the optical film 13 contacts the second sub-limiting portion 152 during shaking.

[0062] The second sub-limiting portion 152 is doped with a plurality of reflective particles 1521. The plurality of reflective particles 1521 are used to reflect the light incident on the second sub-limiting portion 152, thereby ensuring the normal transmission of the light to a large extent. The doping concentration of the reflective particles 1521 can be set to adapt to the optical properties of the optical film 13, thereby matching the optical properties of the optical film 13, so that the backlight module 10 has a uniform optical emission effect.

[0063] Please refer again Figure 2 The plastic frame 14 includes a frame body 141 and the limiting portion 15, one end of the limiting portion 15 is fixedly connected to the frame body 141, and the first hole 122 is a blind hole; the first sub-limiting portion 151 has a length range H1, and the light guide plate 12 has a thickness range H2, and the length range H1 of the first sub-limiting portion 151 and the thickness range H2 of the light guide plate 12 satisfy: H2>H1≥H2×0.5.

[0064] In one embodiment of the present application, the frame includes a frame body 141 and a limiting portion 15. The limiting portion 15 may be, but is not limited to, prepared on the frame body 141 by injection molding or other process forms. It can be understood that the process form of the limiting portion 15 should not be a limitation on the backlight module 10 provided in this embodiment. The limiting portion 15 may be, but is not limited to, prepared separately after preparing the frame body 141. The limiting portion 15 may also be processed and prepared together during the preparation process of the frame body 141, that is, the limiting portion 15 may be, but is not limited to, integrally formed with the frame body 141.

[0065] In this embodiment, the first hole 122 is a blind hole, that is, the first hole 122 does not penetrate the light guide plate 12. The first sub-limiting portion 151 has a length range H1, and the light guide plate 12 has a thickness range H2. The length range H1 of the first sub-limiting portion 151 and the thickness range H2 of the light guide plate 12 satisfy: H2>H1≥H2×0.5. That is, in this embodiment, the length of the first sub-limiting portion 151 is less than the thickness of the light guide plate 12, and the thickness of the first sub-limiting portion 151 is greater than or equal to half of the thickness of the light guide plate 12. If the length of the first sub-limiting portion 151 is too short, the fixing effect of the light guide plate 12 and the optical film 13 is not good. In the present embodiment, one end of the first sub-limiting portion 151 is fixedly connected to the rubber frame 14, which has a good fixing effect on the light guide plate 12 and the optical film 13, so there is no need to design a design that penetrates the light guide plate 12. It can be understood that in other embodiments, the first sub-limiting portion 151 of the present application can also penetrate the light guide plate 12, which is not limited here.

[0066] In this embodiment, the limiting portion 15 is arranged on the rubber frame 14 and is used to limit the light guide plate 12 and the optical film 13, so that the optical film 13 and the light guide plate 12 are easy to align during the installation process, and can effectively prevent the light guide plate 12 and the optical film 13 from being misaligned when the display device 1 used in the backlight module 10 shakes. The limiting portion 15 cooperates with the rubber frame 14 to make the connection between the optical film 13 and the light guide plate 12 more firmly, thereby effectively improving the yield of the backlight module 10 and allowing the backlight module 10 to have stable optical performance during operation.

[0067] Please refer again Figure 3 The back plate 11 includes a back plate body 111 and the limiting portion 15, one end of the limiting portion 15 is fixedly connected to the back plate body 111, the first hole 122 is a through hole, and passes through the light emitting surface 121 of the light guide plate 12 and the surface opposite to the light emitting surface 121, and the back plate 11 has a groove 112, the groove 112 is exposed and arranged on a side of the back plate 11 adjacent to the light guide plate 12, and the limiting portion 15 is at least partially accommodated in the groove 112 of the back plate 11.

[0068] In one embodiment of the present application, the back panel 11 includes a back panel body 111 and the limiting portion 15. The limiting portion 15 may be, but is not limited to, prepared on the back panel body 111 by injection molding or other process forms. It can be understood that the process form of the limiting portion 15 should not be a limitation on the backlight module 10 provided in this embodiment. The limiting portion 15 may be, but is not limited to, being prepared separately after preparing the back panel body 111. The limiting portion 15 may also be processed and prepared together during the preparation of the back panel body 111, that is, the limiting portion 15 may be, but is not limited to, being integrally formed with the frame body 141.

[0069] In this embodiment, the first hole 122 is a through hole, and the first hole 122 passes through the light emitting surface 121 of the light guide plate 12 and the surface opposite to the light emitting surface 121. The back plate 11 has a groove 112, and the shape of the groove 112 can be, but is not limited to, a cylinder, an elliptical body, or a cuboid. Preferably, the shape of the groove 112 can be arranged to fit the shape of the limiting portion 15. The groove 112 is exposed and arranged on a side of the back plate 11 adjacent to the light guide plate 12, and the limiting portion 15 is at least partially accommodated in the groove 112 of the back plate 11.

[0070] In this embodiment, the limiting portion 15 is arranged on the back panel 11, and the limiting portion 15 is partially received in the groove 112 of the backpack, so as to achieve the effect of limiting and fixing the light guide plate 12 and the optical film 13, so that the optical film 13 and the light guide plate 12 are easy to align during the installation process, and can effectively prevent the light guide plate 12 and the optical film 13 from being misaligned when the display device 1 used in the backlight module 10 shakes, so that the backlight module 10 has excellent optical properties, and the limiting portion 15 is arranged on the back panel 11, and the limiting portion 15 can be but not limited to transferring the heat generated by the light guide plate 12 and the optical film 13 during operation to the back panel 11, and dissipating the heat through the back panel 11, further ensuring the safe and reliable operation of the backlight module 10.

[0071] Please refer again Figure 3 The groove 112 has a depth range H3, the back plate 11 has a thickness range H4, and the relationship between the depth range H3 of the groove 112 and the thickness range H4 of the back plate 11 satisfies: H3≤H4×0.4.

[0072] The groove 112 has a depth range H3, and the back plate 11 has a thickness range H4. It is understandable that the depth of the groove 112 can be, but is not limited to, one-fifth or two-fifths of the thickness of the back plate 11. It is understandable that the depth of the groove 112 can also be other depths, as long as the depth of the groove 112 is less than or equal to two-fifths of the thickness of the back plate 11. The depth range of the groove 112 is less than or equal to two-fifths of the back plate 11, wherein, preferably, the depth of the groove 112 is equal to or approximately equal to one-fifth of the thickness range of the back plate 11, thereby avoiding the depth of the groove 112 being too shallow, resulting in poor fixing effect of the limiting portion 15 on the back plate 11, and also avoiding the bearing effect of the back plate 11 being affected by the depth of the groove 112 being too deep. For example, the depth of the groove 112 can be but is not limited to 0.2 mm. On this basis, the limiting portion 15 is accommodated in the groove 112 of the back panel 11, so that the limiting portion 15 has a good fixing effect on the back panel 11 and will not affect the bearing effect of the back panel 11, thereby stably limiting the light guide plate 12 and the optical film 13, so that the backlight module 10 is still stable and reliable in the face of shaking and collision during operation.

[0073] See also Fig.10 and Fig.11 , Fig.10 is a schematic diagram of the top view of the backlight module of an embodiment of the present application, Fig.11It is a schematic diagram of the top structure of the backlight module of the embodiment of the present application. The light emitting surface 121 includes a first edge 1211, a second edge 1212 and a third edge 1213, the first edge 1211 and the second edge 1212 are arranged opposite to each other, one end of the third edge 1213 is bent and connected to the first edge 1211, and the other end of the third edge 1213 is bent and connected to the second edge 1212. The limiting portion 15 is arranged adjacent to the third edge 1213, and there is a gap between the limiting portion 15 and the third edge 1213. The number of the limiting portions 15 is at least two, one of the limiting portions 15 is arranged adjacent to the first edge 1211, and there is a gap between the limiting portion 15 and the first edge 1211, and the other of the limiting portions 15 is arranged adjacent to the second edge 1212, and there is a gap between the limiting portion 15 and the second edge 1212.

[0074] The light emitting surface 121 includes a first edge 1211, a second edge 1212 and a third edge 1213. The first edge 1211 may be, but not limited to, a straight edge or a design that is approximately a straight edge or a curved edge, which is not limited here. The second edge 1212 may be, but not limited to, a straight edge or a design that is approximately a straight edge or a curved edge, which is not limited here. The third edge 1213 may be, but not limited to, a straight edge or a design that is approximately a straight edge or a curved edge, which is not limited here. The first edge 1211 and the second edge 1212 are arranged opposite to each other, and the length of the first edge 1211 and the length of the second edge 1212 may be, but not limited to, equal or approximately equal.

[0075] One end of the third side 1213 is connected to the first side 1211 by bending, and the bending angle between the third side 1213 and the first side 1211 may be, but is not limited to, 90° or approximately 90°. The other end of the third side 1213 is connected to the second side 1212 by bending, and the bending angle between the third side 1213 and the second side 1212 may be, but is not limited to, 90° or approximately 90°.

[0076] The limiting portion 15 may be, but is not limited to, disposed adjacent to the third side 1213, and the limiting portion 15 may be, but is not limited to, having a gap with the third side 1213, so that the directions corresponding to the peripheral side surfaces of the limiting portion 15 can limit the optical film 13 and the light guide plate 12. If the peripheral side surfaces of the limiting portion 15 are exposed at the third side 1213, the peripheral side surfaces of the limiting portion 15 exposed at the third side 1213 cannot limit the light guide plate 12 and the optical film 13.

[0077] The number of the limiting parts 15 may be, but is not limited to, two, three, four, or other numbers. It is understandable that the number of the limiting parts 15 should not be a limitation on the backlight module 10 provided in this embodiment. Preferably, the number of the limiting parts 15 is two ( Fig.10 ), or three ( Fig.11 ), in one embodiment of the present application, the number of the limiting parts 15 is two as an example for illustration ( Fig.10 ), specifically, one of the two limiting portions 15 is disposed adjacent to the first edge 1211, and there is a gap between the limiting portion 15 and the first edge 1211, so that the directions corresponding to the peripheral side surfaces of the limiting portion 15 can limit the optical film 13 and the light guide plate 12. The other of the limiting portions 15 is disposed adjacent to the second edge 1212, and there is a gap between the limiting portion 15 and the second edge 1212, so that the directions corresponding to the peripheral side surfaces of the limiting portion 15 can limit the optical film 13 and the light guide plate 12. In this embodiment, the number of the limiting portions 15 is set to two, and they are respectively arranged adjacent to the first edge 1211 and the second edge 1212 of the light guide plate 12, so that the limiting portions 15 can have a good fixing effect on the light guide plate 12 and the optical film 13, and will not affect the optical properties of the light guide plate 12 and the optical film 13. Therefore, while ensuring that the backlight module 10 has an excellent optical effect, the problem of misalignment of the light guide plate 12 and the optical film 13 caused by collision and shaking of the backlight module 10 is avoided, so that the backlight module 10 maintains a uniform and stable optical effect.

[0078] Please refer again Fig.11 The third side 1213 has a center line 121a passing through the center of the third side 1213, and the center line 121a is coplanar with the light emitting surface 121. The number of the limiting portions 15 is at least three, and another one of the limiting portions 15 is disposed at the position where the center line 121a is located.

[0079] In the embodiment of the present application, the number of the limiting parts 15 is three as an example. Specifically, one of the three limiting parts 15 is arranged adjacent to the first side 1211, and there may be but not limited to a gap between the limiting part 15 and the first side 1211, so that the directions corresponding to the peripheral side surfaces of the limiting part 15 can limit the optical film 13 and the light guide plate 12. Another of the limiting parts 15 is arranged adjacent to the second side 1212, and there may be but not limited to a gap between the limiting part 15 and the second side 1212, so that the directions corresponding to the peripheral side surfaces of the limiting part 15 can limit the optical film 13 and the light guide plate 12. Another of the limiting parts 15 is arranged at the position where the center line 121a is located, and there may be but not limited to a gap between the limiting part 15 and the third side 1213. In this embodiment, the number of the limiting portions 15 is set to three, and they are respectively arranged adjacent to the center positions of the first edge 1211, the second edge 1212 and the third edge 1213 of the light guide plate 12, thereby further enhancing the ability of the limiting portions 15 to have a good fixing effect on the light guide plate 12 and the optical film 13, and will not affect the optical properties of the light guide plate 12 and the optical film 13, thereby ensuring that the backlight module 10 has an excellent optical effect while avoiding the misalignment of the light guide plate 12 and the optical film 13 caused by collision and shaking of the backlight module 10, so that the backlight module 10 maintains a uniform and stable optical effect.

[0080] See also Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 , Figure 5 is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application, Figure 6 is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application, Figure 7 is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application, Figure 8 is a partial structural schematic diagram of a cross section of a display device along line AA according to an embodiment of the present application, Fig. 9 yes Figure 2 The plastic frame 14 includes a protrusion 142, which is disposed on a side of the frame body 141 adjacent to the optical film 13, and a distance range D1 is provided between the protrusion 142 and the optical film 13, and the distance range D1 satisfies: 0.2mm≤D1≤0.4mm.

[0081] The protrusion 142 may be, but is not limited to, integrally formed with the frame body 141. The shape of the protrusion 142 may be, but is not limited to, a Z-shaped ( Figure 2 ), or a rectangle, or a trapezoid. It can be understood that the shape of the protrusion 142 should not be a limitation on the backlight module 10 provided in this embodiment.

[0082] The raised portion 142 is disposed on one side of the frame body 141 adjacent to the optical film 13. The raised portion 142 can be used to press the optical film 13 and to control the Z-direction gap between the optical film 13 and the rubber frame 14. It can effectively control the up and down shaking of the optical film 13 and the light guide plate 12, thereby effectively preventing the display device 1 using the backlight module 10 from making abnormal noises when vibrating or falling.

[0083] There is a distance range D1 between the protrusion 142 and the optical film 13, and the distance range D1 can be but not limited to 0.2mm, or 0.3mm, or 0.4mm, as long as 0.2mm≤D1≤0.4mm is satisfied. There is a distance range between the protrusion 142 and the optical film 13, and the protrusion 142 can effectively control the up and down shaking of the optical film 13 and the light guide plate 12, thereby effectively preventing the display device 1 used in the backlight module 10 from making abnormal noises when vibrating or falling, and at the same time, the optical film 13 and the protrusion 142 can have a certain space distance, so that the optical film 13 will not have a volume change space due to excessive temperature during operation, and will not be easily damaged or wrinkled when pressed by external force.

[0084] Please refer again Figure 1 and Figure 2 , Figure 3 The present application provides a display device 1 , which includes a display panel 20 and a backlight module 10 . The backlight module 10 is disposed on one side of the display panel 20 to provide a surface light source for the display panel 20 .

[0085] The display device 1 may be any product or component having a display function. For example, the display device 1 may be a vehicle-mounted display device 1, a smart phone, a portable phone, a navigation device, a television (TV), a vehicle-mounted audio system, a laptop computer, a tablet computer, a portable multimedia player (PMP), a personal digital assistant (PDA), etc. The limiting portion 15 of the embodiment of the present application passes through the optical film 13 and the light guide plate 12, replacing the double-sided tape 18 to limit the optical film 13 and the light guide plate 12 to the left and right, thereby not affecting the optical effect of the backlight module 10, avoiding display unevenness problems such as dark shadows, and making it easy to align the optical film 13 and the light guide plate 12 during installation, reducing the operation time, and the limiting portion 15 can effectively prevent the light guide plate 12 and the optical film 13 from being misaligned when the display device 1 used in the backlight module 10 shakes by limiting and fixing the optical film 13 and the light guide plate 12, thereby effectively improving the reliability of the backlight module 10 and making the backlight module 10 have stable optical performance, thereby ensuring the safe and stable operation of the display device 1.

[0086] Mentioning "embodiment" and "implementation method" in this application means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrases in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments. In addition, it should also be understood that the features, structures or characteristics described in the various embodiments of the present application can be arbitrarily combined to form another embodiment that does not deviate from the spirit and scope of the technical solution of the present application, provided that there is no contradiction between them.

[0087] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the above preferred implementation modes, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A backlight module, characterized in that: The backlight module comprises: Back panel; A light guide plate, the light guide plate is carried by the back plate, the light guide plate has a light emitting surface and an opening at least located at a first hole of the light emitting surface, and the light emitting surface is used for emitting light; an optical film, the optical film being disposed on a side of the light guide plate away from the back plate, the optical film having a light incident surface, the light incident surface being disposed adjacent to the light emitting surface and being used to receive light emitted by the light guide plate, the optical film having a second hole penetrating the light incident surface and a surface disposed opposite to the light incident surface; and A plastic frame, wherein the plastic frame portion is disposed on a side of the optical film away from the light guide plate, and is used to cooperate with the back plate to accommodate and fix the light guide plate and the optical film; Among them, the rubber frame or the back panel includes a limiting portion, and the limiting portion is at least partially accommodated in the first hole and the second hole to limit the light guide plate and the optical film, and the limiting portion includes a first sub-limiting portion and a second sub-limiting portion, the first sub-limiting portion is at least partially accommodated in the first hole, and the first sub-limiting portion is made of transparent material, the second sub-limiting portion is at least partially accommodated in the second hole, and the second sub-limiting portion is made of transparent material, and the material of the second sub-limiting portion is different from that of the first sub-limiting portion.

2. The backlight module according to claim 1, characterized in that: The material of the first sub-limiting part includes at least one of polycarbonate and polymethyl methacrylate; the material of the second sub-limiting part is transparent rubber, and the hardness of the transparent rubber is: 40~60A; and the second sub-limiting part is doped with multiple reflective particles, and the multiple reflective particles are used to reflect light incident on the second sub-limiting part.

3. The backlight module according to claim 1, wherein: The rubber frame includes a frame body and the limiting part, one end of the limiting part is fixedly connected to the frame body, and the first hole is a blind hole; the first sub-limiting part has a length range H1, and the light guide plate has a thickness range H2, and the length range H1 of the first sub-limiting part and the thickness range H2 of the light guide plate satisfy: H2>H1≥H2×0.

5.

4. The backlight module according to claim 1, wherein: The back panel includes a back panel body and the limiting portion, one end of the limiting portion is fixedly connected to the back panel body, the first hole is a through hole, and passes through the light emitting surface of the light guide plate and the surface opposite to the light emitting surface, and the back panel has a groove, the groove is exposed and arranged on a side of the back panel adjacent to the light guide plate, and the limiting portion is at least partially accommodated in the groove of the back panel.

5. The backlight module according to claim 4, characterized in that: The groove has a depth range H3, the back plate has a thickness range H4, and the relationship between the depth range H3 of the groove and the thickness range H4 of the back plate satisfies: H3≤H4×0.

4.

6. The backlight module according to claim 1, wherein: The light emitting surface comprises a first side, a second side and a third side, wherein the first side is arranged opposite to the second side, one end of the third side is connected to the first side by a bending, and the other end of the third side is connected to the second side by a bending; The limiting portion is disposed adjacent to the third side, and there is a gap between the limiting portion and the third side; The number of the limiting parts is at least two, one of the limiting parts is arranged adjacent to the first side, and a gap is formed between the limiting part and the first side, and the other of the limiting parts is arranged adjacent to the second side, and a gap is formed between the limiting part and the second side.

7. The backlight module according to claim 6, wherein: The third side has a center line passing through the center position of the third side, and the center line is coplanar with the light emitting surface; The number of the limiting parts is at least three, and another one of the limiting parts is arranged at the position where the center line is located.

8. The backlight module according to claim 3, wherein: The rubber frame includes a raised portion, the raised portion is disposed on a side of the frame body adjacent to the optical film, and a distance range D1 is defined between the raised portion and the optical film, and the distance range D1 satisfies: 0.2 mm ≤ D1 ≤ 0.4 mm.

9. A display device, characterized in that: The display device comprises a display panel and a backlight module as claimed in any one of claims 1 to 8, wherein the backlight module is arranged on one side of the display panel and is used to provide a surface light source for the display panel.

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