Backlight module and display device

Abstract

The application provides a backlight module, which comprises a light guide plate, a back plate and a light source assembly. The light guide plate has a first surface, a second surface and a third surface. The second surface connects the first surface and the third surface. The first surface and the third surface are oppositely arranged. The second surface is the light entrance surface of the light guide plate. The back plate has a first part, a second part and a third part which are connected by bending. The light guide plate is accommodated in the back plate. The first part corresponds to the first surface. The second part corresponds to the second surface. The third part corresponds to the third surface. The second part of the back plate is a non-planar structure. There is a light reflection channel between the second part and the second surface. The light source assembly is located in the accommodation space formed between the third surface and part of the third part. The light emitted by the light source assembly is incident on the light entrance surface of the light guide plate after being reflected by the second part and the light reflection channel.

Description

Technical Field

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

[0002] Please see Figure 1 , Figure 1 The diagram shown is a schematic of a backlight module structure in the prior art. Figure 1 As shown, a typical backlight module 1 generally includes an LED (light-emitting diode) light source 2, a light guide plate 3, a flexible printed circuit (FPC) 4, a backplate 5, a reflective sheet 6, and an optical film assembly 7. The LED light source 2 is mounted on the flexible printed circuit board 4, and the flexible printed circuit board 4 is electrically connected to the LED light source 2. The light guide plate 3 is located on the reflective sheet 6, and the optical film assembly 7 is located on the light guide plate 3. Typically, the backlight module 1 uses a side-lit backlight, meaning the LED light source 2 and the flexible printed circuit board 4 are located on the side of the light guide plate 3, and the light emitted by the LED light source 2 directly enters the corresponding side of the light guide plate 3. Figure 1 As shown, in the prior art, the back plate 5 is bent to form a receiving space, thereby accommodating and fixing the LED light source 2, the light guide plate 3, the flexible circuit board 4, and the reflector 6. During the bending process, since the LED light source 2 and the flexible circuit board 4 are located on the side of the light guide plate 3, a certain space needs to be reserved to accommodate them. Specifically, the distance D1 from the side of the light guide plate 3 to the edge of the back plate 5 in a lateral direction (which can be defined as the direction in which the light guide plate 3 extends towards the edge where the LED light source 2 is located in the backlight module 1) is at least the width of the LED light source 2 in the aforementioned lateral direction plus the width of the flexible circuit board 4 protruding from the LED light source 2 in the aforementioned lateral direction. Figure 1 In the process, the edge of the flexible circuit board 4 does not reach the inner side of the back plate 5 in the aforementioned lateral direction, thereby making the aforementioned distance D1 larger, resulting in a wider edge area of ​​the backlight module 1 in the prior art, which is not conducive to achieving a narrow bezel for the display device.

[0003] Currently, users have increasingly higher requirements for narrow bezels in display devices. Therefore, how to reduce the width of the edge area of ​​the backlight module to achieve narrow bezels in display devices is an urgent problem to be solved. Summary of the Invention

[0004] The present invention provides a backlight module and a display device to solve the problem of wide edge areas in existing backlight modules.

[0005] To achieve the above object, the present application provides a backlight module, which comprises a light guide plate, a back plate and a light source assembly, the light guide plate has a first surface, a second surface and a third surface, the second surface connects the first surface and the third surface, the first surface and the third surface are oppositely arranged, and the second surface is the light entrance surface of the light guide plate; the back plate has a first part, a second part and a third part which are connected by bending, the second part connects the first part and the third part, the light guide plate is accommodated in the back plate, the first part corresponds to the first surface, the second part corresponds to the second surface, and the third part corresponds to the third surface, so that the light guide plate is clamped between the first part and at least part of the third part, and a containing space is formed between the third surface and part of the third part, the second part of the back plate is a non-planar structure, and there is a light reflection channel between the second part and the second surface; the light source assembly is located in the containing space, and the light emitted by the light source assembly is incident on the light entrance surface of the light guide plate after being reflected by the second part and the light reflection channel.

[0006] As an optional technical solution, the backlight module further comprises a reflection assembly, the reflection assembly is located in the light reflection channel between the second surface of the light guide plate and the second part of the back plate, and the light emitted by the light source assembly is reflected to the light guide plate by the reflection assembly after being incident on the reflection assembly.

[0007] As an optional technical solution, the second part of the back plate comprises a first back plate unit and a second back plate unit which are connected, the first back plate unit and the second back plate unit are symmetrical about the third surface of the light guide plate, the included angle between the first back plate unit and the third surface is 45°, and the included angle between the second back plate unit and the third surface is 45°.

[0008] As an optional technical solution, the third surface of the light guide plate extends through the end of the second part of the back plate away from the second surface, the end of the second part of the back plate away from the second surface has a convex distance relative to the second surface, and the convex distance is consistent with the thickness of the light guide plate.

[0009] As an optional technical solution, the reflection assembly is a reflection layer, and the reflection layer is located on the side of the second part of the back plate facing the second surface of the light guide plate.

[0010] As an optional technical solution, the reflection assembly is a reflection medium, and the reflection medium is filled in the light reflection channel.

[0011] As an optional technical solution, the third part of the back plate comprises a plurality of back plate units which are connected, and the plurality of back plate units form the containing space between the side of the third part of the back plate adjacent to the second part of the back plate and the third surface.

[0012] As an optional technical solution, the backlight module further comprises an optical film set, a reflecting sheet and a flexible circuit board, the optical film set is located on the first surface of the light guide plate, the reflecting sheet is located between the third surface of the light guide plate and the third component of the back plate, and the flexible circuit board is located between the reflecting sheet and the light source assembly, and the flexible circuit board is electrically connected with the light source assembly.

[0013] As an optional technical solution, the end of the flexible circuit board towards the second component does not exceed the second surface of the light guide plate.

[0014] In addition, the present application further provides a display device comprising the backlight module.

[0015] The present application provides a backlight module and a display device, by setting the light source assembly on the back of the light guide plate, and designing the back plate as a non-planar structure and setting the reflecting assembly inside the back plate, so that the light emitted from the light source assembly can reach the light entrance surface of the light guide plate through the reflecting assembly, thereby shortening the space width originally required for the light source assembly in the back plate of the side-in backlight module, reducing the edge area width of the side-in backlight module, thereby realizing the narrow frame of the display device, and improving the light utilization rate by using the reflecting assembly. BRIEF DESCRIPTION OF DRAWINGS

[0016] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the backlight module structure of the prior art;

[0018] Figure 2 It is a schematic diagram of the backlight module structure of the first embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of the backlight module structure of the second embodiment of the present application. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the present application, the present application will be further described below with reference to the preferred embodiments and the accompanying drawings. Similar components are denoted by the same reference numerals in the drawings. Those skilled in the art should understand that the specific description below is illustrative and not limiting, and should not limit the protection scope of the present application.

[0021] Please refer to Figure 2 , Figure 2The diagram shown is a schematic representation of the backlight module structure according to the first embodiment of the present invention. The present invention provides a backlight module 100, which includes a light guide plate 10, a back plate 20, a light source assembly 30, and a reflective assembly 40. The light guide plate 10 has a first surface 11, a second surface 12, and a third surface 13. The second surface 12 connects the first surface 11 and the third surface 13, and the first surface 11 and the third surface 13 are disposed opposite to each other. The second surface 12 is the light incident surface of the light guide plate 10. The back plate 20 has a first component 21, a second component 22, and a third component 23 that are bent and connected, wherein the second component 22 connects the first component 21 and the third component 23. The light guide plate 10 is housed in the back plate 20. The first component 21 corresponds to the first surface 11, the second component 22 corresponds to the second surface 12, and the third component 23 corresponds to the third surface 13, so that the light guide plate 10 is sandwiched between the first component 21 and at least a portion of the third component 23, while a receiving space is formed between the third surface 13 of the light guide plate 10 and a portion of the third component 23. The second component 22 of the back plate 20 is a non-planar structure, and there is a light reflection channel between the second component 22 and the second surface 12 of the light guide plate 10; the light source assembly 30 is located in the aforementioned accommodating space, and the light emitted by the light source assembly 30 is directed toward the second component 22 and reflected by the light reflection channel before entering the interior of the light guide plate 10 after being incident on the second surface 12 of the light guide plate 10.

[0022] like Figure 2 As shown, in this embodiment, the reflective component 40 is located in the light reflection channel between the second component 22 of the back plate 20 and the second surface 12 of the light guide plate 10. The light emitted by the light source component 30 is reflected by the reflective component 40 to the second surface 12 of the light guide plate 10 and then enters the interior of the light guide plate 10 (the light path is shown by the thick solid line in the figure).

[0023] In this embodiment, the second component 22 of the back plate 20 includes a first back plate unit 221 and a second back plate unit 222 connected to each other. The extended plane of the third surface 13 of the light guide plate 10 (shown by the thick dashed line in the figure) passes through the end of the second component 22 of the back plate 20 away from the second surface 12. Furthermore, the first back plate unit 221 and the second back plate unit 222 can be symmetrical about the third surface 13. The angle between the first back plate unit 221 and the third surface 13 is 45°, and the angle between the second back plate unit 222 and the third surface 13 is also 45°. Thus, the protrusion distance D2 of the end of the second component 22 of the back plate 20 away from the second surface 12 of the light guide plate 10 relative to the second surface 12 is consistent with the thickness of the light guide plate 10.

[0024] In the present application, the light source assembly 30 is arranged on the back of the light guide plate 10, the second component 22 of the back plate 20 is arranged as a non-plane symmetric structure, and the first back plate unit 221 and the second back plate unit 222 of the second component 22 are provided with the reflection assembly 40 in the light reflection channel between the light guide plate 10 and the light-in surface, so that the light emitted from the back of the light guide plate 10 can reach the light-in surface (i.e. the second surface 12) of the light guide plate 10 through the reflection of the reflection assembly 40, thereby shortening the space width originally required for the light source assembly 30 in the back plate 20, reducing the edge area width of the backlight module 100, thereby realizing the narrow frame of the display device, and improving the light utilization rate by using the reflection assembly 40.

[0025] In the present embodiment, as shown in Figure 2 The third component 23 of the back plate 20 comprises a third back plate unit 231, a fourth back plate unit 232 and a fifth back plate unit 233 connected together, and one end of the third back plate unit 231 is connected to the second back plate unit 222 of the second component 22, and the fourth back plate unit 232 extends from the thickness direction of the light guide plate 10 and is connected to the other end of the third back plate unit 231. A containing space is formed on the side of the third component 23 of the back plate 20 close to the second component 22 of the back plate 20 by the third back plate unit 231 and the fourth back plate unit 232, and the light source assembly 30 is located in the containing space, and the fifth back plate unit 233 is clamped and supported in the remaining area.

[0026] In actual application, the backlight module 100 further comprises an optical film set 50, a reflection sheet 60 and a flexible circuit board 70. The optical film set 50 is located on the first surface 11 of the light guide plate 10, the reflection sheet 60 is located between the third surface 13 of the light guide plate 10 and the third component 23 of the back plate 20, the flexible circuit board 70 is located between the reflection sheet 60 and the flexible circuit board 70, the flexible circuit board 70 is electrically connected to the light source assembly 30 to provide electrical signals to the light source assembly 30, and the end of the flexible circuit board 70 towards the second component 22 does not exceed the second surface 12 of the light guide plate 10, so that the end of the flexible circuit board 70 can avoid affecting the light transmission of the light source assembly 30, and the width of the edge area of the backlight module 100 is not increased. In the present embodiment, the light source assembly 30 is an LED assembly.

[0027] It should be noted that, Figure 2In the following illustrations, the sizes of the light guide plate 10 and the light source assembly 30 are exaggerated. In actual operation, in some embodiments, the thickness of the light guide plate 10 is less than the width of the light source assembly 30. As described in the background art, in the prior art backlight module 1, the back plate 5 needs to reserve space to place the LED light source 2 and the flexible circuit board 4 during the bending process. The distance D1 between the light-incident surface of the light guide plate 3 and the edge of the backlight module 1 where the LED light source 2 is located is at least the width of the LED light source 2 plus the width of the flexible circuit board 4 protruding relative to the LED light source 2. However, in the backlight module 100 of the present invention, since the second component 22 of the back plate 20 is a non-planar structure, the light source assembly 30 is disposed on the back side of the light guide plate 10. The light emitted by the light source assembly 30 first enters the light reflection channel between the second component 22 of the back plate 20 and the light-incident surface of the light guide plate 10 and is then reflected to the light-incident surface of the light guide plate 10. This shortens the edge width of the backlight module 100 and caters to the trend of narrow bezels.

[0028] Furthermore, in this embodiment, the second component 22 of the back plate 20 has a 45° non-planar symmetrical structure, that is, the protrusion distance D2 of the end of the second component 22 of the back plate 20 away from the light-incident surface of the light guide plate 10 is approximately equal to the thickness of the light guide plate 10. In this embodiment, the width of the edge region of the backlight module 100 is the protrusion distance D2, which is the thickness of the light guide plate 10. Compared with the prior art, the width of the edge region of the backlight module 100 can be reduced by (D1-D2), that is, the width of the LED light source 2 in the direction of the light guide plate 3 extending toward the edge of the backlight module 1 where the LED light source 2 is located plus the width of the flexible circuit board 4 protruding relative to the LED light source 2 in this direction minus the thickness of the light guide plate 10, thereby greatly reducing the width of the edge region of the backlight module 100. Taking a common mobile phone as an example, the width of the LED light source 2 is 0.85mm, the width of the flexible circuit board 4 protruding from the LED light source 2 is 0.2mm, and the thickness of the light guide plate 10 is 0.37mm. That is, the width of the edge area of ​​the backlight module 100 can be reduced by 0.68mm, and the width of the edge area is reduced by nearly 65%.

[0029] In this embodiment, the reflective component 40 is a reflective layer 41, which is located within the aforementioned light reflection channel. In one embodiment, the reflective layer 41 may be a silver layer (e.g., but not limited to, coated on the surface of the second component 22 facing the light-incident surface 12), but it is not limited thereto; any material with high reflectivity is acceptable. In this embodiment, the reflective component 40 is a component other than the back plate 20. In actual operation, the reflective component 40 may also be a component on the back plate 20. For example, the back plate 20 may be a metal back plate, and the reflective component 40 may also be the surface of the metal back plate facing the light-incident surface of the light guide plate 10, which can provide a reflective function.

[0030] Please see Figure 3 ,Figure 3 Figure 2 shows a schematic diagram of a backlight module structure according to a second embodiment of the present application. Different from the first embodiment, as shown in Figure 2, the reflective component 40 is a reflective medium 42 filled in the light reflection channel. The light emitted by the light source component 30 is incident to the reflective medium 42 and is reflected by the reflective medium 42 to the light entrance surface of the light guide plate 10 and then enters the interior of the light guide plate 10 (the light path is shown by the thick solid line in the figure). Figure 3

[0031] In the present embodiment, the second part 22' of the back plate 20 also comprises a first back plate unit 221' and a second back plate unit 222' connected to each other. Different from the first embodiment, in the present embodiment, the included angle between the first back plate unit 221' and the second back plate unit 222' can be adjusted according to the total reflection angle of the reflective medium 42. The structure formed by the connection of the first back plate unit 221' and the second back plate unit 222' can be adjusted according to the shape of the reflective medium 42, and is not limited to the non-planar structure formed by the first back plate unit 221 and the second back plate unit 222 in the first embodiment. For example, the first back plate unit 221' and the second back plate unit 222' can be arc-shaped, etc.

[0032] In addition, the present application also provides a display device comprising the above-mentioned backlight module. Specifically, the display device can comprise a display panel and the above-mentioned backlight module. The display panel is located on the above-mentioned backlight module, and the above-mentioned backlight module can provide a backlight source for the display panel.

[0033] In summary, the present application provides a backlight module and a display device. By arranging the light source component on the back surface of the light guide plate, and designing the back plate as a non-planar structure and arranging the reflective component on the inner side of the back plate, the light emitted by the light source component from the back surface can reach the light entrance surface of the light guide plate through the reflective component. Thus, the width of the space originally required by the back plate for the light source component in the edge-type backlight module is reduced, the width of the edge region of the edge-type backlight module is reduced, and the narrow frame of the display device is realized. In addition, the light utilization rate is improved by using the reflective component.

[0034] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above-mentioned description. Here, all the embodiments cannot be exhaustively listed. Any obvious changes or variations derived from the technical solutions of the present application still fall within the protection scope of the present application.​

Claims

1. A backlight module, characterized in that, Include: A light guide plate has a first surface, a second surface, and a third surface. The second surface connects the first surface and the third surface. The first surface and the third surface are disposed opposite to each other. The second surface is the light incident surface of the light guide plate. A backplate has a first component, a second component, and a third component that are bent and connected, wherein the second component connects the first component and the third component. A light guide plate is housed in the backplate. The first component corresponds to the first surface, the second component corresponds to the second surface, and the third component corresponds to the third surface, so that the light guide plate is sandwiched between the first component and at least a portion of the third component. At the same time, a receiving space is formed between the third surface and a portion of the third component. The second component of the backplate has a non-planar structure, and a light reflection channel is provided between the second component and the second surface. as well as A light source assembly is located within the housing space. The light emitted by the light source assembly is directed toward the second component and reflected by the light reflection channel before being incident on the light-incident surface of the light guide plate. The backlight module also includes a reflector and a flexible circuit board. The reflector is located between the third surface of the light guide plate and the third component of the back plate. The flexible circuit board is electrically connected to the light source assembly to provide an electrical signal to the light source assembly. The flexible circuit board is located between the reflector and the light source assembly, and the end of the flexible circuit board facing the second component is flush with the second surface of the light guide plate.

2. The backlight module according to claim 1, characterized in that, The backlight module also includes a reflective component located in the light reflection channel between the second surface of the light guide plate and the second component of the back plate. Light emitted by the light source component is reflected by the reflective component to the light guide plate after hitting the reflective component.

3. The backlight module according to claim 1, characterized in that, The second component of the backplate includes a first backplate unit and a second backplate unit connected to each other. The first backplate unit and the second backplate unit are symmetrical about the third surface of the light guide plate. The angle between the first backplate unit and the third surface is 45°, and the angle between the second backplate unit and the third surface is 45°.

4. The backlight module according to claim 3, characterized in that, The third surface of the light guide plate extends through the end of the second component of the back plate away from the second surface, and the end of the second component of the back plate away from the second surface has a protrusion distance relative to the second surface, the protrusion distance being consistent with the thickness of the light guide plate.

5. The backlight module according to claim 2, characterized in that, The reflective component is a reflective layer located on the side of the second component of the back plate facing the second surface of the light guide plate.

6. The backlight module according to claim 2, characterized in that, The reflective component is a reflective medium that fills the light reflection channel.

7. The backlight module according to claim 1, characterized in that, The third component of the back panel includes a plurality of interconnected back panel units, which form the receiving space between the third component of the back panel on the side adjacent to the second component of the back panel and the third surface.

8. The backlight module according to claim 1, characterized in that, The backlight module also includes an optical film assembly located on the first surface of the light guide plate.

9. A display device, characterized in that, Includes the backlight module according to any one of claims 1 to 8.

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