CN114002880A

CN114002880A - Backlight module and display device

Info

Publication number: CN114002880A
Application number: CN202111184811.8A
Authority: CN
Inventors: 高伟
Original assignee: Huizhou Shiwei New Technology Co Ltd
Current assignee: Huizhou Shiwei New Technology Co Ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2022-02-01

Abstract

The application provides a backlight unit and display device, backlight unit includes: a diffusion plate; the PCB is arranged opposite to the diffusion plate and comprises a first sub-board and a second sub-board, a plurality of light-emitting sources are arranged on the first sub-board and the second sub-board, and the light-emitting directions of the light-emitting sources face the diffusion plate; the distance from the first sub-plate to the diffusion plate is smaller than the distance from the second sub-plate to the diffusion plate; the light control part is arranged between the PCB and the diffusion plate and comprises a first light control part and a second light control part, the first light control part is opposite to the first sub-plate, the second light control part is corresponding to the second sub-plate, a plurality of first light holes are formed in the first light control part, a plurality of second light holes are formed in the second light control part, and the density of the first light holes is larger than that of the second light holes. The backlight module in this application simple structure has higher production efficiency and luminance homogeneity.

Description

Backlight module and display device

Technical Field

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

Background

The backlight module comprises a direct type backlight module and a side type backlight module. The direct type backlight module has low cost but thick thickness. The side-in backlight module has a small thickness and a high cost. In order to make the direct-type backlight module more competitive, the thickness of the direct-type backlight module is generally reduced. Patent CN203731203U discloses a backlight module with variable OD (light mixing distance), which improves the receiving capacity by forming a receiving cavity on the backlight module, thereby reducing the overall thickness of the display.

In the design of the backlight module, the lamp spacing corresponding to the small OD needs to be very small, which may cause the following problems: the small OD area lamps have high arrangement density, so that the brightness of the small OD area is high, and the overall brightness consistency of the backlight module is difficult to improve; or, the arrangement density of the lamps is inconsistent, and the backlight driving scheme is difficult to realize; or, the lamp panels or various dispensing shapes of the same model are needed to be matched, the module is difficult to produce, and the production efficiency is low.

Disclosure of Invention

The application provides a backlight module and display device, aims at solving the problem that exists in the backlight module of current change OD.

The embodiment of the present application provides a backlight module, comprising,

a diffusion plate;

the PCB is arranged opposite to the diffusion plate and comprises a first sub-board and a second sub-board, a plurality of light-emitting sources are arranged on the first sub-board and the second sub-board, and the light-emitting directions of the light-emitting sources face the diffusion plate; the distance from the first sub-plate to the diffusion plate is smaller than the distance from the second sub-plate to the diffusion plate;

the light control part is arranged between the PCB and the diffusion plate and comprises a first light control part and a second light control part, the first light control part is arranged opposite to the first sub-plate, the second light control part is arranged on the second sub-plate, a plurality of first light transmitting holes are formed in the first light control part, a plurality of second light transmitting holes are formed in the second light control part, and the density of the first light transmitting holes is greater than that of the second light transmitting holes.

In some embodiments of the present application, a distance between two adjacent light-emitting sources on the first sub-board is equal to a distance between two adjacent light-emitting sources on the second sub-board; or the like, or, alternatively,

the density of the light-emitting sources on the first sub-board is equal to that on the second sub-board.

In some embodiments of the present application, a density of the first light-transmitting holes is greater than a density of the light-emitting sources on the first sub-board, and a density of the second light-transmitting holes is equal to a density of the light-emitting sources on the second sub-board.

In some embodiments of the present application, the plurality of light emitting sources on the second sub-board correspond to the plurality of second light-transmitting holes one to one.

In some embodiments of the present application, the first light holes are uniformly distributed on the first light control portion, and the second light holes are uniformly distributed on the second light control portion.

In some embodiments of the present application, at least one supporting portion is disposed on a side of the first sub-board facing the diffuser plate, and the first light control portion is at least partially located on the supporting portion, so that the first light control portion is spaced apart from the plurality of light emitting sources located on the first sub-board.

In some embodiments of the present application, the light source is an LED light bar, a plurality of the LED light bars are disposed in parallel on the PCB, and a distance between two adjacent LED light bars on the first sub-board is equal to a distance between two adjacent LED light bars on the second sub-board.

In some embodiments of the present application, the light control member comprises a reflective sheet, or a PET film, or a PMMA plate.

In some embodiments of the present application, the backlight module further includes a back plate disposed on a side of the PCB board away from the diffusion plate;

the back plate comprises a first sub back plate, a second sub back plate and a connecting part;

the first sub-board is arranged on the first sub-back board in a stacked mode, and the second sub-board is arranged on the second sub-back board in a stacked mode.

Another aspect of the present application provides a display device, including the backlight module.

The application provides a backlight unit and display device, backlight unit in this application include PCB board, accuse light spare and with the diffuser plate that PCB board set up relatively. The light control piece is arranged between the PCB and the diffusion plate. The light control part comprises a first light control part and a second light control part, a plurality of first light holes are formed in the first light control part, a plurality of second light holes are formed in the second light control part, and the density of the first light holes is larger than that of the second light holes. Through the density of controlling first light trap in this application is greater than the density of second light trap, reduces or has avoided the influence of the density of arranging of light emitting source to backlight unit performance, is favorable to improving backlight unit production efficiency and luminance homogeneity.

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 based on these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of an embodiment of a backlight module provided in the present application.

Description of the drawings: the backlight module 10, the PCB 1, the first sub-board 11, the supporting portion 111, the second sub-board 12, the light emitting source 13, the lens 14, the diffusion plate 2, the light control member 3, the first light control portion 31, the first light transmitting hole 311, the second light control portion 32, the second light transmitting hole 321, the back plate 4, the first sub-back plate 41, the second sub-back plate 42, and the connecting portion 43.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered 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 defined 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.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of an embodiment of a backlight module provided in the present application. The backlight module 10 includes a PCB 1, a light controlling member 3, and a diffusion plate 2 disposed opposite to the PCB 1. The backlight module 10 provided by the application has a simple structure, and is beneficial to improving the production efficiency and the light emitting performance of the backlight module 10.

Patent CN203731203U discloses a backlight module, which reduces the thickness of the display by forming a recess on the back plate. In the patent, the distances between the light bars on the first back plate and the second back plate are different, and the corresponding lamp distance at a small OD (light mixing distance) is also smaller, so that the following problems exist: the small OD area lamps have high arrangement density, so that the brightness of the small OD area is high, and the overall brightness consistency of the module is difficult to improve; or, the arrangement density of the lamps is inconsistent, and the backlight driving scheme is difficult to realize; or, the lamp panels or various dispensing shapes of the same model are needed to be matched, the module is difficult to produce, and the production efficiency is low.

The light mixing distance refers to a distance between an upper surface of the light emitting source (e.g., the lamp panel) and a lower surface of the diffuser plate. The OD-variable backlight module means that 2 or more than 2 OD values exist in the backlight module, namely the lamp panel is of a non-whole plane structure. Generally, the larger the OD, the more thoroughly the beam mixes, the lighter the lamp shadow, and the better the visual effect. But a larger OD results in a larger thickness of the backlight module.

In the prior art, the light mixing distance is generally adjusted by adjusting the spacing of the light emitting sources and/or the shape of the lens. Taking the backlight module with variable OD as an example, in the way of adjusting the light mixing distance by adjusting the distance between the light emitting sources, the lamp distance corresponding to the small OD needs to be very small. In the manner of adjusting the light mixing distance by adjusting the shape of the lens, the shape of the lens on the lamp corresponding to the small OD is different from the shape of the lens on the lamp corresponding to the large OD, resulting in a complex dispensing process.

Based on the defects existing in the backlight module with variable OD in the prior art, the embodiment of the application provides the backlight module. The backlight module 10 includes a PCB 1, a light controlling member 3, and a diffusion plate 2 disposed opposite to the PCB 1. This application through set up accuse light 3 between PCB board 1 with diffuser plate 2. The light control part 3 includes a first light control part 31 and a second light control part 32, the first light control part 31 is provided with a plurality of first light holes 311, the second light control part 32 is provided with a plurality of second light holes 321, and the density of the first light holes 311 is greater than that of the second light holes 321.

Compared with the prior art, the backlight module in the application has the advantages that the density of the first light holes 311 is greater than that of the second light holes 321, so that the interval of the light emitting sources 13 and/or the shape change of the lenses can be reduced or avoided, and the production efficiency and the performance of the backlight module are improved.

In some embodiments of the present application, the plurality of first light holes 311 are uniformly distributed on the first light control portion 31, and the plurality of second light holes 321 are uniformly distributed on the second light control portion 32. The structure can improve the aperture ratio of the light control member 3, which is beneficial to further improving the brightness uniformity of the backlight module 10 and improving the light output quantity.

In the embodiment of the present application, the PCB board 1 includes a first sub-board 11 and a second sub-board 12. The first light control part 31 is disposed opposite to the first sub-board 11, and the second light control part 32 is disposed on the second sub-board 12. The first light control part 31 and the first sub-plate 11 may be disposed opposite to each other, such that the first light control part 31 and the first sub-plate 11 are disposed opposite to each other in a direction F perpendicular to the diffuser plate 2, or the first light control part 31 and the first sub-plate 11 are disposed obliquely relative to each other in a direction perpendicular to the diffuser plate 2. The second light control portion 32 may be disposed on the second sub-board 12, the second light control portion 32 may be disposed opposite to the second sub-board 12, for example, the second light control portion 32 and the second sub-board 12 may be disposed opposite to each other in a direction F perpendicular to the diffuser plate 2, the second light control portion 32 and the second sub-board 12 may be disposed obliquely to each other in the direction F perpendicular to the diffuser plate 2, or the second light control portion 32 may be stacked on or covered on the second sub-board 12, which is not limited herein.

In the embodiment of the present application, the PCB board 1 includes a first sub-board 11 and a second sub-board 12, and a distance from the first sub-board 11 to the diffuser plate 2 is smaller than a distance from the second sub-board 12 to the diffuser plate 2. A plurality of light emitting sources 13 are respectively provided on the first sub-board 11 and the second sub-board 12. The light emitting directions of the light emitting sources 13 face the diffusion plate 2. The diffusion plate 2 makes incident light fully disperse, has an optical diffusion effect, and can form a uniform and stable surface light source, so that the display device obtains a softer and uniform picture effect.

It should be noted that the distance from the first sub-plate 11 to the diffuser plate 2 is the first light mixing distance OD1, and the distance from the second sub-plate 12 to the diffuser plate 2 is the second light mixing distance OD 2. The first light mixing distance OD1 and the second light mixing distance OD2 can be set according to actual needs. In actual production, the first light mixing distance OD1 and the second light mixing distance OD2 can be set according to preset cost and thickness. The specific values of the first light mixing distance OD1 and the second light mixing distance OD2 are not important to the discussion of the present application and are not limited herein.

In the present application, the shapes of the lamp panels or the lenses corresponding to the small OD region (i.e., the region above the first sub-board 11) and the large OD region (i.e., the region above the second sub-board 12) may be the same or different. The same lamp plate means that the lamp density on the lamp plate or the space between two adjacent lamp strips is the same.

In the embodiment of the present application, the light-emitting source 13 refers to a device capable of emitting light. For example, the light emitting source 13 may be an LED lamp, a miniLED lamp. Further, the backlight module 10 further includes a plurality of lenses 14, and each of the light emitting sources 13 is covered with the lens 14.

Specifically, the light emitting source 13 is a miniLED lamp panel, wherein the miniLED lamp panel includes a plurality of miniLED lamp strips arranged in parallel to each other. The PCB board 1 is electrically connected to the light emitting sources 13, and the PCB board 1 receives an external signal to control the plurality of light emitting sources 13 thereon. Exemplarily, 4 miniLED light bars are arranged on the first sub-board 11, the 4 miniLED light bars are arranged at equal intervals, and the interval between two adjacent miniLED light bars is S1. Be equipped with 4 miniLED lamp strips on the

second daughter board

12, 4 miniLED lamp strips equidistant settings, the interval between two adjacent miniLED lamp strips is S2. In this embodiment, S1 and S2 are equal, that is, the distance between the light bars on the first sub-board 11 and the second sub-board 12 is the same. In other embodiments of the present application, the density of the light-emitting sources 13 on the first sub-board 11 is equal to the density of the light-emitting sources 13 on the second sub-board 12, wherein the density of the light-emitting sources 13 refers to the ratio of the number of the light-emitting sources to the area of the corresponding first sub-board 11 or second sub-board 12. This arrangement is advantageous for improving the production efficiency and brightness uniformity of the backlight module 10.

In some embodiments of the present application, the density of the first light-transmitting holes 311 is greater than that of the light-emitting sources 13 on the first sub-board 11, and the density of the second light-transmitting holes 321 is equal to that of the light-emitting sources 13 on the second sub-board 12. Specifically, the plurality of light sources 13 on the second sub-board 12 correspond to the plurality of second light holes 321 one-to-one, that is, the arrangement manner of the first light holes 311 is different from the arrangement manner of the light sources 13 on the first sub-board 11, the arrangement manner of the second light holes 321 is the same as the arrangement manner of the light sources 13 on the second sub-board 12, and the structural arrangement is favorable for simplifying the manufacturing process of the backlight module 10.

In some embodiments of the present application, at least one supporting portion 111 is disposed on a side of the first sub-board 11 facing the diffuser plate 2, and the first light control portion 31 is at least partially disposed on the supporting portion 111, so that the first light control portion 31 is spaced apart from the plurality of light emitting sources 13 disposed on the first sub-board 11. Illustratively, the first light control part 31 is located above the light emitting source 13, and keeps a small gap with the upper end of the light emitting source 13. The second light control part 32 is tightly attached to the second sub-board 12, which is advantageous to fix the light control part 3 on the PCB 1 more stably and make the structure of the backlight module 10 more compact.

In some embodiments of the present application, the light controlling member 3 comprises a reflective sheet, or a PET film, or a PMMA plate. The thickness of the light controlling member 3 may be set according to the application environment, and is not limited herein.

In some embodiments of the present application, the backlight module 10 further includes a back plate 4, and the back plate 4 is disposed on a side of the PCB board 1 away from the diffusion plate 2. The back sheet 4 includes a first sub back sheet 41, a second sub back sheet 42, and a connection portion 43. The first sub-board 11 is stacked on the first sub-back board 41, and the second sub-board 12 is stacked on the second sub-back board 42. Specifically, the back plate 4 is an integrally formed structure, and the material of the back plate 4 may be metal or plastic. The first sub-board 11 may be fixed to the first sub-back board 41 by bonding, welding, or riveting, and the second sub-board 12 may be fixed to the second sub-back board 42 by bonding, welding, or riveting, which is not limited herein.

The backlight module and the display device provided by the embodiment of the present application are described in detail above, and the principle and the embodiment of the present invention are explained in the present application 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 variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A backlight module is characterized by comprising,

a diffusion plate;

2. The backlight module as claimed in claim 1, wherein the distance between two adjacent light emitting sources on the first sub-board is equal to the distance between two adjacent light emitting sources on the second sub-board; or the like, or, alternatively,

3. The backlight module as claimed in claim 2, wherein the density of the first light holes is greater than the density of the light-emitting sources on the first sub-board, and the density of the second light holes is equal to the density of the light-emitting sources on the second sub-board.

4. The backlight module as claimed in claim 3, wherein the plurality of light-emitting sources on the second sub-board correspond to the plurality of second light-transmitting holes one to one.

5. The backlight module as claimed in claim 1, wherein the first light holes are uniformly distributed on the first light control portion, and the second light holes are uniformly distributed on the second light control portion.

6. The backlight module according to claim 1, wherein a side of the first sub-board facing the diffuser plate is provided with at least one supporting portion, and the first light controlling portion is at least partially disposed on the supporting portion, such that the first light controlling portion is spaced apart from the plurality of light sources disposed on the first sub-board.

7. The backlight module of claim 1, wherein the light sources are LED light bars, a plurality of the LED light bars are disposed in parallel on the PCB, and a distance between two adjacent LED light bars on the first sub-board is equal to a distance between two adjacent LED light bars on the second sub-board.

8. The backlight module of claim 1, wherein the light control member comprises a reflective sheet, or a PET film, or a PMMA plate.

9. The backlight module as claimed in claim 1, wherein the backlight module further comprises a back plate disposed on a side of the PCB board away from the diffusion plate;

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