Backlight module

Abstract

The present application discloses a backlight module, comprising a driving substrate, an LED light-emitting device, a first dimming plate, a semi-transparent and semi-reflective layer, and a second dimming plate. The driving substrate comprises a first and second surfaces arranged oppositely; the LED light-emitting device is arranged on the first surface of the driving substrate; the first dimming plate is arranged on the first surface of the driving substrate, and the surface of the first dimming plate facing the first surface is recessed to form a first dimming groove, the first dimming groove being arranged oppositely to the LED light-emitting device; the semi-transparent and semi-reflective layer is arranged within the first dimming groove; the second dimming plate comprises a third and fourth surfaces arranged oppositely to each other, the third surface of the second dimming plate being arranged on the second surface of the driving substrate, and a second dimming groove being recessed to form on at least one of the third and fourth surfaces, the second dimming groove being arranged oppositely to the first dimming groove. The present application aims to solve the technical problem in the prior art that the double-sided light-emitting structure of the backlight module is complex and difficult to achieve in terms of lightness and thinness.

Description

Technical Field

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

[0002] MLED display will be the future trend of display technology development due to its advantages such as high contrast, high brightness, energy saving and environmental protection. In the process of researching and practicing the existing technology, the inventors of this application found that the current backlight design includes two types: direct-down and side-entry. The direct-down type can achieve high contrast of display devices because its backlight source can be controlled in different areas. Direct-down MLED is generally used for single-sided display. When double-sided display is required in some scenes, backlight sources need to be set on both sides, which is not only costly but also takes up space and makes the overall structure relatively thick. Therefore, it is necessary to develop a backlight module to overcome the defects of the existing technology. Summary of the Invention

[0003] The embodiments of the present application provide a backlight module that can solve the technical problem in the prior art that the double-sided light-emitting structure of the backlight module is complex and difficult to achieve lightweight and thinness.

[0004] The embodiment of the present application provides a backlight module, comprising:

[0005] a driving substrate, the driving substrate comprising a first surface and a second surface disposed opposite to each other;

[0006] An LED light-emitting device, wherein the LED light-emitting device is provided on the first surface of the driving substrate;

[0007] a first dimming plate, the first dimming plate being arranged on the first surface of the driving substrate, the surface of the first dimming plate facing the first surface being concavely formed to form a first dimming groove, the first dimming groove being arranged opposite to the LED light-emitting device;

[0008] a semi-transmissive and semi-reflective layer, the semi-transmissive and semi-reflective layer being disposed in the first dimming slot; and

[0009] The second dimming plate includes a third surface and a fourth surface arranged opposite to each other, the third surface of the second dimming plate is arranged on the second surface of the driving substrate, at least one of the third surface and the fourth surface is recessed to form a second dimming groove, and the second dimming groove is arranged opposite to the first dimming groove.

[0010] Optionally, in some embodiments of the present application, the first dimming groove and the second dimming groove are both arranged as arc-shaped grooves.

[0011] Optionally, in some embodiments of the present application, the semi-transmissive and semi-reflective layer is attached to the inner wall of the first dimming groove, and the surface of the semi-transmissive and semi-reflective layer facing the first surface is arranged in an arc shape.

[0012] Optionally, in some embodiments of the present application, the second dimming slot includes a first dimming sub-slot and a second dimming sub-slot, the first dimming sub-slot is arranged on the third surface, the second dimming sub-slot is arranged on the fourth surface, and the first dimming sub-slot and the second dimming sub-slot are both arranged opposite to the first dimming slot.

[0013] Optionally, in some embodiments of the present application, there are at least two first dimming sub-grooves, wherein two first dimming sub-grooves are arranged at intervals along the third surface, and both first dimming sub-grooves are arranged opposite to the first dimming groove.

[0014] Optionally, in some embodiments of the present application, the symmetry centers of the at least two first dimming sub-grooves coincide with the central axis of the first dimming groove, and the center of the LED light-emitting device coincides with the central axis of the first dimming groove.

[0015] Optionally, in some embodiments of the present application, there are at least two second dimming sub-grooves, wherein two second dimming sub-grooves are arranged at intervals along the fourth surface, and both second dimming sub-grooves are arranged opposite to one first dimming sub-grooves.

[0016] Optionally, in some embodiments of the present application, the first dimming sub-groove and the second dimming sub-groove have the same shape and are symmetrically arranged with respect to each other.

[0017] Optionally, in some embodiments of the present application, the surface of the first dimming plate facing the first surface is recessed to form a plurality of the first dimming grooves, at least one of the third surface and the fourth surface is recessed to form a plurality of the second dimming grooves, one first dimming groove is arranged opposite to at least one second dimming groove, and there are multiple LED light-emitting devices, and one of the LED light-emitting devices is located in one of the first dimming grooves.

[0018] Optionally, in some embodiments of the present application, the backlight module further includes two diffusion plates, one of the diffusion plates is arranged on the surface of the first dimming plate facing away from the driving substrate, and the other of the diffusion plates is arranged on the fourth surface of the second dimming plate.

[0019] The embodiment of the present application adopts a backlight module including a driving substrate, an LED light-emitting device, a first dimming plate, a semi-transparent and semi-reflective layer, and a second dimming plate. The driving substrate includes a first surface and a second surface arranged opposite to each other, and the LED light-emitting device is arranged on the first surface of the driving substrate. The first dimming plate is arranged on the first surface of the driving substrate, and the surface of the first dimming plate facing the first surface is concave to form a first dimming groove, the first dimming groove is arranged opposite to the LED light-emitting device, and the semi-transparent and semi-reflective layer is arranged in the first dimming groove. The second dimming plate includes a third surface and a fourth surface arranged opposite to each other, the third surface of the second dimming plate is arranged on the second surface of the driving substrate, and at least one of the third and fourth surfaces is concave to form a second dimming groove, and the second dimming groove is arranged opposite to the first dimming groove.

[0020] In this way, the light emitted by the LED light-emitting device will first illuminate the semi-transparent and semi-reflective layer in the first dimming groove. Part of the light can directly pass through the semi-transparent and semi-reflective layer and be emitted from the first dimming plate, and part of the light will be reflected by the semi-transparent and semi-reflective layer and be emitted from the second dimming plate. In this way, there is no need to set up backlight sources on both sides, and the effect of double-sided light emission can be achieved, which greatly reduces the thickness of the backlight module. At the same time, due to the low power consumption, there is no need to set up an additional heat dissipation mechanism, thereby making the double-sided display screen lighter and thinner. In addition, when light passes through the first dimming groove or the second dimming groove, it will be refracted to diffuse the light, thereby increasing the double-sided light-emitting viewing angle of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a cross-sectional schematic diagram of the backlight module provided in the first embodiment of the present application;

[0023] Figure 2 is a cross-sectional schematic diagram of a backlight module provided in a second embodiment of the present application;

[0024] Figure 3 is a cross-sectional schematic diagram of a backlight module provided in the third embodiment of the present application;

[0025] Figure 4 It is a cross-sectional schematic diagram of the backlight module provided in the fourth embodiment of the present application. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0027] The present application provides a backlight module 100. The following are detailed descriptions of each embodiment. It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments.

[0028] Reference Figure 1 The first embodiment of the present application provides a backlight module 100, which includes a driving substrate 10, an LED light-emitting device 20, a first dimming plate 30, a semi-transmissive and semi-reflective layer 40, and a second dimming plate 50. The driving substrate 10 includes a first surface 11 and a second surface 12 arranged opposite to each other, and the LED light-emitting device 20 is arranged on the first surface 11 of the driving substrate 10. The first dimming plate 30 is arranged on the first surface 11 of the driving substrate 10, and a first dimming groove 31 is formed on the surface of the first dimming plate 30 facing the first surface 11. The first dimming groove 31 is arranged opposite to the LED light-emitting device 20, and the semi-transmissive and semi-reflective layer 40 is arranged in the first dimming groove 31. The second dimming plate 50 includes a third surface 51 and a fourth surface 52 arranged opposite to each other. The third surface 51 of the second dimming plate 50 is arranged on the second surface 12 of the driving substrate 10, and a second dimming groove 53 is formed on at least one of the third surface 51 and the fourth surface 52. The second dimming groove 53 is arranged opposite to the first dimming groove 31.

[0029] In this way, the light emitted by the LED light-emitting device 20 will first illuminate the semi-transparent and semi-reflective layer 40 in the first dimming groove 31. Part of the light can directly pass through the semi-transparent and semi-reflective layer 40 and be emitted from the first dimming plate 30. Part of the light is reflected by the semi-transparent and semi-reflective layer 40 and then emitted from the second dimming plate 50. In this way, there is no need to set up backlight sources on both sides, and the effect of double-sided light emission can be achieved, which greatly reduces the thickness of the backlight module 100. At the same time, due to the low power consumption, there is no need to set up an additional heat dissipation mechanism, thereby making the backlight module 100 lighter and thinner. In addition, when light passes through the first dimming groove 31 or the second dimming groove 53, it will be refracted to diffuse the light, thereby increasing the double-sided light-emitting viewing angle of the backlight module 100.

[0030] The driver substrate 10 is a TFT glass substrate with multiple thin-film transistors that drive each LED light-emitting device 20 to emit light. The LED light-emitting devices 20 are tri-color LED chips, including: a red LED light-emitting device 20, a green LED light-emitting device 20, and a blue LED light-emitting device 20. The LED light-emitting devices 20 can be Mini-LED (submillimeter light-emitting diode) chips or Micro-LED (micro light-emitting diode) chips. Mini-LED lamps have micron-scale dimensions, which can provide higher resolution and thus improve light output. The first dimming plate 30 and the second dimming plate 50 are made of a transparent material such as PMMA (polymethyl methacrylate) or PC (polycarbonate). The first dimming groove 31 on the first dimming plate 30 and the second dimming groove 53 on the second dimming plate 50 can be formed in one step by molding. The semi-transparent and semi-reflective layer 40 is a film commonly used in the optical field. It controls the light transmittance and reflectivity by controlling the proportion of metal particles in the main material. The main material can be epoxy resin or polyacetic acid resin, and the filler metal particles can be Al (aluminum) or Ag (silver). It should be noted that in the first embodiment, a second dimming groove 53 is provided on both the third surface 51 and the fourth surface 52 of the second dimming plate 50. Of course, in order to reduce the difficulty of setting up and save costs, the second dimming groove 53 can also be provided only on the third surface 51 of the second dimming plate 50 or only on the fourth surface 52 of the second dimming plate 50.

[0031] Optionally, refer to Figure 1 The first dimming groove 31 and the second dimming groove 53 are both arranged in an arc-shaped groove. The arc-shaped groove is formed to optically refract the light emitted by the LED light-emitting device 20 so as to visually display a larger area, thereby improving the display effect of the backlight module 100. It is understandable that the range of the light output varies with the curvature of the arc-shaped groove. Of course, in other embodiments, the first dimming groove 31 and the second dimming groove 53 can also be arranged in other shapes such as rectangles, which can be selected by those skilled in the art according to their needs.

[0032] Furthermore, the semi-transparent and semi-reflective layer 40 is attached to the inner wall of the first dimming groove 31, and the surface of the semi-transparent and semi-reflective layer 40 facing the first surface 11 is arranged in an arc shape. It should be noted that the semi-transparent and semi-reflective layer 40 can be fixed to the inner wall of the first dimming groove 31 by adhesive bonding, and of course, it can also be formed in the first dimming groove 31 by inkjet printing. After the semi-transparent and semi-reflective layer 40 is arranged in the first dimming groove 31, since the first dimming groove 31 is arranged in an arc shape, the semi-transparent and semi-reflective layer 40 as a whole is also arranged in an arc shape, and the surface of the semi-transparent and semi-reflective layer 40 facing the first surface 11 is concave in the direction away from the drive substrate 10 to form a curved surface. Therefore, when part of the light is reflected by the semi-transparent and semi-reflective layer 40, the arrangement of the curved surface plays a collimating role when the light passes through the drive substrate 10, thereby improving the light output effect of the light emitted from the second dimming plate 50.

[0033] Optionally, the second dimming slot 53 includes a first dimming sub-slot 531 and a second dimming sub-slot 532. The first dimming sub-slot 531 is provided on the third surface 51, and the second dimming sub-slot 532 is provided on the fourth surface 52. The first dimming sub-slot 531 and the second dimming sub-slot 532 are both provided opposite to the first dimming slot 31. By providing the first dimming sub-slot 531 and the second dimming sub-slot 532 on the third surface 51 and the fourth surface 52 of the second dimming plate 50, respectively, when light from the LED light-emitting device 20 is reflected by the semi-transmissive and semi-reflective layer 40, passes through the driver substrate 10, and then travels toward the second dimming plate 50, the light first passes through the first dimming sub-slot 531, diffuses, and travels toward the second dimming sub-slot 532. After passing through the second dimming sub-slot 532, the light further diffuses. That is, light will diffuse twice after passing through the first dimming sub-grooves 531 and the second dimming sub-grooves 532 , so as to further increase the light-emitting viewing angle of the second dimming plate 50 of the backlight module 100 .

[0034] Furthermore, at least two first dimming sub-slots 531 are provided, wherein the two first dimming sub-slots 531 are spaced apart along the third surface 51, and both first dimming sub-slots 531 are disposed opposite the first dimming slot 31. It is understood that the number of first dimming sub-slots 531 can be two, three, or four, and the distance between the first dimming sub-slots 531 at both ends is greater than or equal to the slot size of the first dimming slot 31, so that all collimated light is directed toward the first dimming sub-slots 531. The provision of multiple first dimming sub-slots 531 enhances the ability to evenly diffuse light.

[0035] Furthermore, the centers of symmetry of at least two first dimming sub-slots 531 coincide with the central axis of the first dimming slot 31, and the center of the LED light-emitting device 20 coincides with the central axis of the first dimming slot 31. When there are two first dimming sub-slots 531, their center of symmetry is the intersection of the two first dimming sub-slots 531, so that the central axis of the first dimming slot 31 and the center of the LED light-emitting device 20 are both located at the intersection of the two first dimming sub-slots 531. When there are three first dimming sub-slots 531, their center of symmetry is the center of the middle first dimming sub-slot 531, so that the central axis of the first dimming slot 31 and the center of the LED light-emitting device 20 are both located at the center of the middle first dimming sub-slot 531. This ensures that light from the LED light-emitting device 20, after being reflected by the semi-transmissive and semi-reflective layer 40, can be more evenly directed toward each first dimming sub-slot 531, further ensuring a good light output effect.

[0036] Reference Figure 1 Optionally, at least two second dimming sub-slots 532 are provided, wherein the two second dimming sub-slots 532 are spaced apart along the fourth surface 52, and the two second dimming sub-slots 532 are each disposed opposite a first dimming slot 31. It is understood that the number of second dimming sub-slots 532 may be two, three, or four, and the distance between the second dimming sub-slots 532 at both ends is greater than or equal to the distance between the first dimming sub-slots 531 at both ends, thereby allowing more light passing through the first dimming sub-slots 531 to be directed toward the second dimming sub-slots 532. Furthermore, the provision of multiple second dimming sub-slots 532 enhances the uniform diffusion of light, making the light uniform and reducing the problem of light spots.

[0037] Reference Figure 1 Optionally, the first dimming sub-slot 531 and the second dimming sub-slot 532 have the same shape and are symmetrically arranged. The first dimming sub-slot 531 and the second dimming sub-slot 532 have the same shape and are symmetrically arranged. This not only facilitates unified processing and molding and improves installation convenience, but also ensures that more light passing through the first dimming sub-slot 531 is directed toward the second dimming sub-slot 532, thereby ensuring the light diffusion capability of the second dimming plate 50. Furthermore, when multiple first dimming sub-slots 531 and multiple second dimming sub-slots 532 are provided, the number is the same, and a first dimming sub-slot 531 and a second dimming sub-slot 532 are arranged opposite each other. This further improves the uniform light diffusion capability, makes the light uniform, and reduces the problem of light spots.

[0038] Optionally, refer to Figure 1The surface of the first dimming plate 30 facing the first surface 11 is concavely formed with a plurality of first dimming grooves 31, and at least one of the third surface 51 and the fourth surface 52 is concavely formed with a plurality of second dimming grooves 53. A first dimming groove 31 is arranged opposite to at least one second dimming groove 53. There are multiple LED light-emitting devices 20, and one LED light-emitting device 20 is located in a first dimming groove 31. By arranging multiple LED light-emitting devices 20 in a one-to-one correspondence with multiple first dimming grooves 31, a semi-transparent and semi-reflective layer 40 is provided in each first dimming groove 31, so that the light of each LED light-emitting device 20 can be displayed on both sides, thereby further improving the display effect of the backlight module 100. In addition, each LED light-emitting device 20 corresponds to a first dimming groove 31, thereby reducing the light interference between adjacent LED light-emitting devices 20 to ensure the light output effect.

[0039] Optionally, the backlight module 100 further includes two diffuser plates 60, one diffuser plate 60 being disposed on a surface of the first dimming plate 30 facing away from the driving substrate 10, and the other diffuser plate 60 being disposed on the fourth surface 52 of the second dimming plate 50. The two diffuser plates 60 are provided to further increase the viewing angle of the backlight module 100, further uniformize the light, and reduce the problem of light spots.

[0040] Reference Figure 2 The backlight module 100 of the second embodiment of the present application differs from the backlight module 100 of the first embodiment in that the symmetry centers of at least two first dimming sub-slots 531 coincide with the central axis of the first dimming slot 31, there are at least two LED light-emitting devices 20, and the symmetry centers of at least two LED light-emitting devices 20 coincide with the symmetry centers of at least two first dimming sub-slots 531. This ensures that light from the LED light-emitting devices 20, after being reflected by the semi-transmissive and semi-reflective layer 40, is more evenly directed toward each first dimming sub-slot 531, further ensuring a good light output and making the light uniform, thereby reducing the problem of light spots.

[0041] Reference Figure 3 The backlight module 100 of the third embodiment of the present application differs from the backlight module 100 of the first embodiment in that the slot opening of the second dimming sub-slot 532 is larger than the slot opening of the first dimming sub-slot 531. By further making the slot opening of the second dimming sub-slot 532 larger than the slot opening of the first dimming sub-slot 531, all light passing through the first dimming sub-slot 531 is directed toward the second dimming sub-slot 532, thereby further ensuring the light diffusion capability of the second dimming plate 50 and making the light uniform, thereby reducing the light spot problem.

[0042] Reference Figure 4The backlight module 100 of the fourth embodiment of the present application is different from the backlight module 100 of the first embodiment in that: a diffusion groove 32 is provided on the surface of the first dimming plate 30 facing away from the driving substrate 10, and the diffusion groove 32 is arranged corresponding to the first dimming groove 31. The diffusion groove 32 can be arranged symmetrically with the first dimming groove 31, so that after passing through the first dimming groove 31, the light will be directed toward the diffusion groove 32. Therefore, after the light passing through the semi-transparent and semi-reflective layer 40 is diffused by the first dimming groove 31 of the first dimming plate 30, it will be further refracted when passing through the diffusion groove 32, so that the light is further diffused, thereby increasing the light-emitting angle of the first dimming point of the backlight module 100, making the light uniform, and reducing the light spot problem.

[0043] The above is a detailed introduction to a backlight module provided in an embodiment of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A backlight module, characterized in that: include: a driving substrate, the driving substrate comprising a first surface and a second surface disposed opposite to each other; An LED light-emitting device, wherein the LED light-emitting device is provided on the first surface of the driving substrate; a first dimming plate, the first dimming plate being arranged on the first surface of the driving substrate, the first dimming plate having a surface facing the first surface being concavely formed to form a first dimming groove, the first dimming groove being arranged opposite to the LED light-emitting device, and the first dimming groove being an arc-shaped groove; a semi-transmissive and semi-reflective layer, the semi-transmissive and semi-reflective layer being disposed in the first dimming groove, the semi-transmissive and semi-reflective layer being disposed on an inner wall of the first dimming groove, and the surface of the semi-transmissive and semi-reflective layer facing the first surface being arranged in an arc shape; and The second dimming plate includes a third surface and a fourth surface arranged opposite to each other, the third surface of the second dimming plate is arranged on the second surface of the driving substrate, at least one of the third surface and the fourth surface is recessed to form a second dimming groove, and the second dimming groove is arranged opposite to the first dimming groove.

2. The backlight module according to claim 1, wherein: The second dimming groove is arranged in an arc-shaped groove.

3. The backlight module according to claim 2, wherein: The second dimming slot includes a first dimming sub-slot and a second dimming sub-slot. The first dimming sub-slot is arranged on the third surface, and the second dimming sub-slot is arranged on the fourth surface. The first dimming sub-slot and the second dimming sub-slot are both arranged opposite to the first dimming slot.

4. The backlight module according to claim 3, wherein: There are at least two first light-modulating sub-grooves, wherein two first light-modulating sub-grooves are arranged at intervals along the third surface, and both of the first light-modulating sub-grooves are arranged opposite to the first light-modulating groove.

5. The backlight module according to claim 4, wherein: The symmetry centers of the at least two first dimming sub-grooves coincide with the central axis of the first dimming groove, and the center of the LED light-emitting device coincides with the central axis of the first dimming groove.

6. The backlight module according to claim 3, wherein: There are at least two second dimming sub-grooves, wherein two second dimming sub-grooves are arranged at intervals along the fourth surface, and both of the second dimming sub-grooves are arranged opposite to one of the first dimming sub-grooves.

7. The backlight module according to claim 3, wherein: The first dimming sub-groove and the second dimming sub-groove have the same shape and are symmetrically arranged with respect to each other.

8. The backlight module according to claim 1, wherein: The surface of the first dimming plate facing the first surface is recessed to form a plurality of the first dimming grooves, and at least one of the third surface and the fourth surface is recessed to form a plurality of the second dimming grooves, one first dimming groove is arranged opposite to at least one second dimming groove, and there are a plurality of LED light-emitting devices, and one LED light-emitting device is located in one of the first dimming grooves.

9. The backlight module according to claim 1, wherein: The backlight module further includes two diffusion plates, one of which is arranged on a surface of the first dimming plate facing away from the driving substrate, and the other of which is arranged on a fourth surface of the second dimming plate.

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