CN216434600U

CN216434600U - Backlight module and display device

Info

Publication number: CN216434600U
Application number: CN202122807722.6U
Authority: CN
Inventors: 姚黎晓; 岳春波; 李健林; 王春阳
Original assignee: Huizhou Shiwei New Technology Co Ltd
Current assignee: Huizhou Shiwei New Technology Co Ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-05-03
Anticipated expiration: 2031-11-15

Abstract

The application provides a backlight module and a display device, comprising a reflector plate, wherein the reflector plate is provided with a circuit; and the light-emitting elements are arranged on the reflecting sheet and are connected with the circuit. The backlight module is characterized in that the light-emitting element is arranged on the reflector plate, the light-emitting element is connected with the circuit on the reflector plate, the circuit on the reflector plate is used for providing electric connection for the light-emitting element, and the flexible reflector plate is used for replacing a circuit board which is difficult to bend, so that the flexibility of the backlight module is realized; meanwhile, light rays emitted by the light emitting element to the reflector plate are reflected to the upper side of the light emitting element, so that the light loss of the light emitting element is reduced, and the light emitting rate of the backlight module is improved.

Description

Backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a backlight module and a display device.

Background

At present, with the rapid development of the display industry, the backlight module in the display screen is advanced toward the aspects of low cost, ultra-thin, flexibility, transparency and the like, and a circuit board exists in the backlight module, especially after the miniLED backlight display appears at present, the cost of the circuit board accounts for higher and higher in the whole backlight cost, and because the bending degree of the circuit board is limited, the flexible display screen cannot be prepared due to the influence of the backlight module, and how to solve the technical problem that the flexibility of the backlight module cannot be realized becomes the direction of the technicians in the field.

SUMMERY OF THE UTILITY MODEL

The application provides a backlight module and a display device, aiming at solving the technical problem that the prior backlight module can not realize flexibility.

In a first aspect, the present application provides a backlight module, comprising:

a reflector plate having a circuit thereon;

and the light-emitting elements are arranged on the reflecting sheet and are connected with the circuit.

In some embodiments, the circuit comprises a plurality of positive electrode circuits and negative electrode circuits which are arranged on the surface of the reflector plate in parallel, and the positive electrode circuits and the negative electrode circuits are arranged at intervals.

In some embodiments, the reflective sheet has a first sinking groove disposed at the positive electrode circuit and a second sinking groove disposed at the negative electrode circuit;

the light emitting element has a positive connection pin inserted into the first sinking groove and a negative connection pin inserted into the second sinking groove.

In some embodiments, the depth of the first sinker is greater than the depth of the second sinker.

In some embodiments, the plurality of light emitting elements are arranged on the reflector sheet in a rectangular array;

the light-emitting elements in the same row are connected in parallel to the adjacent positive circuit and the adjacent negative circuit; or

The light emitting elements in the same column are connected in parallel to the adjacent positive and negative circuits.

In some embodiments, the positive and negative electrode circuits are silvery white; and/or;

and waterproof layers are covered on the positive circuit and the negative circuit.

In some embodiments, the reflective sheet further comprises a diffusion film, wherein the diffusion film is positioned on one side of the light-emitting element, which faces away from the reflective sheet;

the diffusion film is attached to the light-emitting element; or

The diffusion film is spaced apart from the light emitting element.

In some embodiments, the backlight module further comprises a back plate, the back plate is attached to one side of the reflector plate, which faces away from the light-emitting element, and the back plate encloses the side faces of the reflector plate and the diffusion film.

In some embodiments, an optical film sheet is also included, as well as an adhesive layer, the optical film sheet being located between the adhesive layer and the diffuser film.

In a second aspect, the present application provides a display device comprising the backlight module as described in the first aspect.

The backlight module is characterized in that the light-emitting element is arranged on the reflector plate, the light-emitting element is connected with the circuit on the reflector plate, the circuit on the reflector plate is used for providing electric connection for the light-emitting element, and the flexible reflector plate is used for replacing a circuit board which is difficult to bend, so that the flexibility of the backlight module is realized; meanwhile, light rays emitted by the light emitting element to the reflector plate are reflected to the upper side of the light emitting element, so that the light loss of the light emitting element is reduced, and the light emitting rate of the backlight module is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a backlight module provided in an embodiment of the present application;

FIG. 2 is an enlarged partial schematic view of the embodiment of the present application at A in FIG. 1;

FIG. 3 is a schematic partial enlarged view at B in FIG. 1 according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a reflector and its circuit provided in the embodiments of the present application;

FIG. 5 is a schematic diagram of another structure of a reflector and its circuit provided in the embodiments of the present application;

FIG. 6 is a schematic view of another structure of a reflector and its circuit provided in the embodiments of the present application;

fig. 7 is a schematic structural diagram of another backlight module provided in the embodiment of the present application.

The LED packaging structure comprises a reflector 10, a circuit 11, conductive silver paste 110, a positive electrode circuit 111, a negative electrode circuit 112, a first sinking groove 12, a second sinking groove 13, a trapezoidal groove 14, a light-emitting element 20, a positive electrode connecting pin 21, a negative electrode connecting pin 22, a diffusion film 30, a back plate 40, an optical membrane 50, an adhesive layer 60, a waterproof layer 70 and packaging glue 80.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the invention. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present invention may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the invention with unnecessary detail. Thus, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Embodiments of the present disclosure provide a backlight module and a display device, which are described in detail below.

First, referring to fig. 1, fig. 1 shows a schematic structural diagram of a backlight module in an embodiment of the present application, where the backlight module includes:

a reflective sheet 10, the reflective sheet 10 having a circuit 11 thereon;

and a plurality of light emitting elements 20, wherein the light emitting elements 20 are mounted on the reflective sheet 10, and the light emitting elements 20 are connected to the circuit 11.

Specifically, the reflective sheet 10 serves as a mounting base for the light emitting elements 20, and has thereon the circuit 11 so as to provide electrical connection for the light emitting elements 20, for example, the light emitting elements 20 are connected to a power source through the circuit 11 to emit light. As an example, a plurality of conductive silver pastes 110 may be formed on the surface of the reflective sheet 10 by a screen printing method, and the conductive silver pastes 110 form part of the circuits 11 of the reflective sheet 10 connected to the light emitting elements 20. It will be understood by those skilled in the art that other methods of forming the circuit 11 on the reflective sheet 10 may be used, for example, a plurality of conductive circuits 11 may be formed by stamping or transferring conductive material on the surface of the reflective sheet 10.

For example, for a display module including a liquid crystal layer, a polarizer and a color filter, the liquid crystal layer and the polarizer control whether the light emitted by the light emitting element 20 passes through the color filter to display a color, and finally the color of a plurality of pixels forms an image. It is understood that the light emitting element 20 of the present application can also provide light emitting sources for other types of display modules, such as those that display images using quantum dot films. Specifically, the light emitting element 20 may be a light emitting diode.

In the embodiment of the application, the light-emitting element 20 is mounted on the reflector plate 10, the light-emitting element 20 is connected with the circuit 11 on the reflector plate 10, and the circuit 11 on the reflector plate 10 provides electrical connection for the light-emitting element 20, and the reflector plate 10 which is relatively low in use cost and flexible replaces a circuit board which is difficult to bend, so that the backlight module can be flexible and the preparation cost of the backlight module can be reduced; meanwhile, the light emitted from the light emitting element 20 to the reflective sheet 10 is reflected to the upper side of the light emitting element 20, so that the light loss of the light emitting element 20 is reduced, and the light emitting rate of the backlight module is improved.

As an example, referring to fig. 1, fig. 2 and fig. 3, fig. 2 shows a schematic partial enlargement at a in fig. 1 of the embodiment of the present application, and fig. 3 shows a schematic partial enlargement at B in the embodiment of the present application, in which the circuit 11 includes a plurality of positive electrode circuits 111 and negative electrode circuits 112 disposed in parallel on the surface of the reflector 10, and the positive electrode circuits 111 and the negative electrode circuits 112 are disposed at intervals. The adjacent positive electrode circuit 111 and negative electrode circuit 112 correspond to the same light emitting element 20, and when the light emitting element 20 is connected to the circuit 11, the positive electrode of the light emitting element 20 is connected to the positive electrode circuit 111, and the negative electrode of the light emitting element 20 is connected to the negative electrode circuit 112, whereby the positive and negative electrodes of the light emitting element 20 are connected to the circuit 11. Generally, the positive circuit 111 and the negative circuit 112 are directly connected at one end, and the other end can be connected with the positive and negative poles of the power supply to realize the whole circuit 11 for connecting the power supply.

As can be understood by those skilled in the art, the circuit 11 on the reflective sheet 10 for the same light emitting device 20 may also be a conductive silver paste 110, and the positive and negative electrodes of a plurality of light emitting devices 20 are simultaneously connected to the same conductive silver paste 110 to form a series connection.

In some embodiments of the present application, for example, for the embodiment where the light emitting element 20 is a light emitting diode, refer to fig. 2 and fig. 3, wherein the reflective sheet 10 has a first sinking groove 12 disposed at the positive electrode circuit 111 and a second sinking groove 13 disposed at the negative electrode circuit 112, and the light emitting element 20 has a positive electrode connecting pin 21 inserted into the first sinking groove 12 and a negative electrode connecting pin 22 inserted into the second sinking groove 13. Since the first and second

sunken grooves

12 and 13 are provided in the reflector sheet 10, when the light emitting element 20 is mounted on the reflector sheet 10, the positive electrode connecting pin 21 of the light emitting element 20 is inserted into the first sunken groove 12, and the negative electrode connecting pin 22 thereof is inserted into the second sunken groove 13, and then the first sunken groove 12 and the positive electrode connecting pin 21, and the second sunken groove 13 and the negative electrode connecting pin 22 are soldered.

In general, in order to prevent the reflector 10 from being softened and deformed by a high temperature during a welding process, low-temperature solder paste is used for soldering. It can be understood that, in order to ensure the connection between the positive connection pin 21 and the negative connection pin 22 and the circuit 11, the conductive silver paste 110 is simultaneously disposed in the first sinking groove 12 and the second sinking groove 13 of the reflective sheet 10, for example, the conductive silver paste 110 is simultaneously disposed on the surface of the reflective sheet 10 and in the first sinking groove 12 and the second sinking groove 13 of the reflective sheet 10 by stamping, transferring, etc.

Further, in order to avoid the situation that the positive connection pin 21 and the negative connection pin 22 of the light emitting element 20 are erroneously connected to the negative circuit 112 and the positive circuit 111, respectively, in some embodiments of the present application, for example, for the embodiment where the reflector sheet 10 has the first sinking groove 12 and the second sinking groove 13, the depth of the first sinking groove 12 is greater than the depth of the second sinking groove 13, and correspondingly, the length of the positive connection pin 21 is greater than the length of the negative connection pin 22. When the light emitting element 20 is mounted on the reflector plate 10, if the positive electrode connecting pipe is inserted into the second sinking groove 13 and the negative electrode connecting pipe is inserted into the first sinking groove 12, the depth of the first sinking groove 12 is greater than the depth of the second sinking groove 13 and the length of the positive electrode connecting pin 21 is greater than the length of the negative electrode connecting pin 22, the whole light emitting element 20 is inclined and cannot be smoothly mounted on the reflector plate 10, and the abnormal phenomenon can be obviously identified and adjusted, so that the phenomenon that the positive electrode connecting pin 21 and the negative electrode connecting pin 22 of the light emitting element 20 are connected with the negative electrode circuit 112 and the positive electrode circuit 111 by mistake is avoided.

In some embodiments of the present application, the plurality of light emitting elements 20 are arranged on the reflective sheet 10 in a rectangular array, and since the light emitting elements 20 are uniformly dispersed on the reflective sheet 10, the light emitting from the whole light emitting module can be more uniform. It is understood that the plurality of light emitting elements 20 may also be arranged on the reflective sheet 10 in an array of a diamond shape, a triangular shape, or the like.

As an exemplary embodiment of a rectangular array of light emitting elements 20 to realize connection of circuits 11, referring to fig. 4, fig. 4 shows a schematic structural diagram of a reflector sheet 10 and its circuits 11 in the embodiment of the present application, wherein, the same column of light emitting elements 20 is connected in parallel to adjacent positive electrode circuit 111 and negative electrode circuit 112, for example, two adjacent conductive silver pastes 110 are respectively used as the positive electrode circuit 111 and the negative electrode circuit 112, because two adjacent conductive silver pastes 110 are arranged along a vertical column and are respectively used as the positive electrode circuit 111 and the negative electrode circuit 112, the positive electrode connecting pin 21 of the same row of light emitting elements 20 is inserted into the first sinker 12 of the positive electrode circuit 111, the negative electrode connecting pin 22 is inserted into the second sinker 13 of the negative electrode circuit 112, that is, the circuits 11 of the same row of light emitting elements 20 are connected in parallel, so that the light emitting elements 20 in the same row have the same voltage, and thus the light efficiency uniformity of the same row of light emitting elements 20 can be ensured, the phenomenon that the brightness is inconsistent due to different voltages of the serially connected light emitting elements 20 because of different resistances caused by different thicknesses of the silk-screen or stamped conductive silver paste 110 is avoided.

As another exemplary embodiment of the rectangular array of light emitting elements 20 to implement the connection of the circuits 11, referring to fig. 5, fig. 5 shows a schematic structural diagram of the reflective sheet 10 and the circuits 11 thereof in the embodiment of the present application, wherein the light emitting elements 20 in the same row are connected in parallel to the adjacent positive circuit 111 and the adjacent negative circuit 112, the two adjacent conductive silver pastes 110 are arranged in a horizontal row and respectively serve as the positive circuit 111 and the negative circuit 112, and the circuits 11 of the light emitting elements 20 in the same row are connected in parallel, so that the light emitting elements 20 in the same row have the same voltage, and further, the light efficiency uniformity of the light emitting elements 20 in the same row can be ensured.

It can be understood that, for the embodiment where the light emitting elements 20 in the same row/the same column are connected in parallel to two adjacent conductive silver pastes 110, the multiple rows/the multiple columns of conductive silver pastes 110 can also be connected in parallel, so that the light emitting elements 20 on the whole reflective sheet 10 are all connected in parallel to ensure the brightness uniformity.

It should be noted that the above-mentioned connection manner of the light emitting elements 20 and the circuit 11 is only exemplary, and those skilled in the art can make equivalent modifications under the guidance of the present application, for example, referring to fig. 6, fig. 6 shows another structural schematic diagram of the reflector plate 10 and the circuit 11 thereof in the embodiment of the present application, wherein the circuit board is provided with vertical rows of trapezoidal grooves 14, and the positive connection pins 21 and the negative connection pins 22 of the light emitting elements 20 in the same row are respectively soldered in the trapezoidal grooves 14.

Further, in order to avoid the influence of the color of the conductive silver paste 110 on the luminous efficiency of the light emitting element 20, in some embodiments of the present application, the positive electrode circuit 111 and the negative electrode circuit 112 are silvery white. Compared with the existing mode of connecting the light-emitting element 20 with the circuit board pad, because the color of the pad is generally brass, the light emitted by the light-emitting element 20 to the pad returns to yellow through the pad, thereby influencing the light-emitting color of the light-emitting element 20. In the present application, after the light emitted from the light emitting element 20 to the positive electrode circuit 111 and the negative electrode circuit 112 is reflected by the conductive silver paste 110, the conductive silver paste 110 is silvery white, so that the light of the light emitting element 20 can be totally reflected, and the light absorption is avoided, thereby ensuring the light efficiency of the light emitting element 20.

Further, in order to avoid the phenomenon of short circuit caused by abnormal electrical connection of the conductive silver paste 110 due to water, referring to fig. 2 and fig. 3, in some embodiments of the present application, the positive electrode circuit 111 and the negative electrode circuit 112 are covered with the waterproof layer 70, and the waterproof layer 70 can cover the conductive silver paste 110 exposed outside the light emitting element 20, so as to protect the conductive silver paste 110 exposed outside the light emitting element 20, and prevent the water on the reflective sheet 10 from causing the short circuit of the positive electrode circuit 111 and the negative electrode circuit 112 on the surface thereof. For example, the waterproof layer 70 may be transparent silicon dioxide to prevent the conductive silver paste 110 from reflecting the light of the light emitting element 20 due to the shielding of the waterproof layer 70.

Further, referring to fig. 1, the backlight module further includes a diffusion film 30, the diffusion film 30 is located on a side of the light emitting element 20 away from the reflector 10, and light of the light emitting element 20 is refracted, reflected and scattered after entering the diffusion film 30, so that a traveling path of the light is changed, the incident light is fully scattered to generate an optical diffusion effect, and light emitting uniformity of the backlight module is ensured.

In some embodiments of the present application, referring to fig. 1, the diffusion film 30 is attached to the light emitting element 20, that is, the light emitting element 20 is used as a supporting structure for the diffusion film 30, so that a supporting structure for supporting the diffusion film 30 is not required to be disposed in the backlight module, and when the backlight module is bent flexibly, the backlight module can be facilitated to achieve a flexible function due to no influence of the supporting structure.

In other embodiments of the present application, referring to fig. 7, fig. 7 is a schematic structural diagram of a backlight module in the embodiments of the present application, where the diffusion film 30 and the light emitting element 20 are disposed at an interval, that is, a certain light mixing distance is ensured between the diffusion film 30 and the light emitting element 20, so that light emitted from the light emitting element 20 can be uniformly incident on the diffusion film 30, thereby being beneficial to ensuring uniformity of light emitted from the backlight module.

Further, with reference to fig. 7, the backlight module further includes a back plate 40, the back plate 40 is attached to a side of the reflector plate 10 away from the light emitting device 20, the back plate 40 encloses side surfaces of the reflector plate 10 and the diffusion film 30, the back plate 40 protects a bottom surface of the reflector plate 10, and the side surfaces of the reflector plate 10 and the diffusion film 30 are enclosed to prevent external impurities (e.g., dust) from entering the backlight module, so as to ensure the sealing performance of the entire backlight module.

It can be understood that, for the sealing of the backlight module, referring to fig. 1, an encapsulation adhesive 80 may be filled between the diffusion film 30 and the reflective sheet 10 to further improve the sealing performance of the backlight module.

Further, in some embodiments of the present application, the backlight module further includes an optical film 50 and an adhesive layer 60, the optical film 50 is located between the adhesive layer 60 and the diffusion film 30, the adhesive layer 60 can facilitate adhesion of tempered glass to protect the entire backlight module, and the optical film 50 can further improve uniformity and light emitting angle of light emitted from the light emitting element 20.

It should be noted that the foregoing is intended to clearly illustrate the backlight module verification process of the present application, and those skilled in the art can make equivalent design modifications under the guidance of the present application, for example, simultaneously screen-printing conductive silver paste 110 for connecting multiple sets of positive electrode circuits 111 and negative electrode circuits 112 in parallel on the reflector plate 10.

Further, in order to better implement the backlight module in the present application, an embodiment of the present application further provides a display device on the backlight module, where the display device includes the backlight module according to any of the above embodiments. The display device in the embodiment of the present application has all the advantages of the backlight module due to the backlight module in the embodiment, and details are not repeated herein.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and parts that are not described in detail in a certain embodiment may refer to the above detailed descriptions of other embodiments, and are not described herein again. It is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

The backlight module and the display device provided by the embodiment of the present invention are described in detail above, and the principle and the implementation of the present invention are explained herein by applying a specific example, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be some changes in the specific implementation and application scope, and to sum up, the content of the present specification should not be understood as a limitation to the present invention.

Claims

1. A backlight module, comprising:

a reflective sheet having a circuit thereon;

2. The backlight module according to claim 1, wherein the circuit comprises a plurality of positive circuits and negative circuits disposed on the surface of the reflective sheet, and the positive circuits and the negative circuits are spaced apart from each other.

3. The backlight module according to claim 2, wherein the reflective sheet has a first sinker disposed at the positive electrode circuit and a second sinker disposed at the negative electrode circuit;

the light emitting element has a positive electrode connection pin inserted into the first sinking groove and a negative electrode connection pin inserted into the second sinking groove.

4. The backlight module of claim 3, wherein the depth of the first sunken groove is greater than the depth of the second sunken groove.

5. The backlight module of claim 2, wherein the plurality of light emitting elements are arranged in a rectangular array on the reflective sheet;

The light emitting elements in the same column are connected in parallel to the adjacent positive electrode circuit and the adjacent negative electrode circuit.

6. The backlight module according to claim 2, wherein the positive electrode circuit and the negative electrode circuit are silver white; and/or;

and the positive circuit and the negative circuit are covered with waterproof layers.

7. The backlight module of claim 1, further comprising a diffuser film on a side of the light emitting elements facing away from the reflector sheet;

the diffusion film is attached to the light-emitting element; or alternatively

The diffusion film is disposed at a distance from the light emitting element.

8. The backlight module of claim 7, further comprising a back plate, wherein the back plate is attached to a side of the reflective sheet facing away from the light emitting elements, and the back plate encloses sides of the reflective sheet and the diffusion film.

9. The backlight module of claim 7, further comprising an optical film sheet and an adhesive layer, the optical film sheet being located between the adhesive layer and the diffusion film.

10. A display device comprising the backlight module according to any one of claims 1 to 9.