WO2017206366A1

WO2017206366A1 - Backlight module and display device

Info

Publication number: WO2017206366A1
Application number: PCT/CN2016/095373
Authority: WO
Inventors: 尤君平; 李圣; 陆振华; 李海鹰; 孙小军
Original assignee: 深圳创维－Rgb电子有限公司
Priority date: 2016-06-03
Filing date: 2016-08-15
Publication date: 2017-12-07
Also published as: CN105938273A; CN105938273B

Abstract

Provided are a backlight module and a display device, the backlight module comprising a PCB (1) having a backlight source (2) fixedly arranged, and a reflective sheet (3) fitted on the inner board surface of the PCB (1), the reflective sheet (3) being provided with a through hole for the backlight source (2) to penetrate, the PCB (1) is provided, at an gap region between an outer edge of the backlight source (2) and hole edge of the through hole, with a reflective layer (4) for reflecting light rays. Therefore, the utilization rate of the backlight source (2) and the evenness of backlight brightness of the display device can be improved, thus improving the display quality of the display device.

Description

Backlight module and display device

Technical field

The present invention relates to the field of display device technologies, and in particular, to a backlight module and a display device.

Background technique

In today's display devices (such as liquid crystal display devices, liquid crystal televisions, etc.), there is usually a matching difference between the backlight and the optical component, for example, in a direct-lit type liquid crystal display device using a backlight as an LED, in order to make a reflective sheet It can be easily and firmly adhered to the PCB board and the LED fixed on the PCB board. The reflective sheet usually has a through hole for the LED to be exposed and larger than the LED. In this case, the LED is in the through hole. The PCB board not covered with the reflective sheet is exposed around, and the PCB board has a low reflection effect on the light, so that the backlight can not be fully utilized on the one hand, and the brightness around the backlight is low on the other hand, thereby The uniformity of the backlight brightness of the display device is reduced, both of which reduce the display quality of the display device.

Summary of the invention

The main object of the present invention is to provide a backlight module, which aims to improve the utilization ratio of the backlight and the uniformity of the backlight brightness of the display device, thereby improving the display quality of the display device.

In order to achieve the above object, a backlight module provided by the present invention includes a PCB board with a backlight and a reflective sheet attached to the inner surface of the PCB. The reflective sheet is provided with the backlight. a through hole, the PCB board is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight and the edge of the through hole.

Preferably, the reflective layer is a reflective ink layer.

Preferably, the reflective ink layer is white or silver white.

Preferably, the material of the reflective ink layer comprises glass particles.

Preferably, the glass particles have a particle size on the order of nanometers.

Preferably, the reflective ink layer is formed onto the PCB by silk screen printing.

Preferably, the reflective ink layer has a thickness of 10 um to 40 um.

Preferably, the reflective ink layer has a thickness of 25 um to 40 um.

Preferably, the reflective layer is a reflective film attached to the PCB board.

Preferably, the backlight module further includes a diffusion plate disposed above the reflective sheet for uniformly distributing light, and an optical film assembly stacked on the diffusion plate for improving light distribution. The optical film assembly includes a lower diffusion sheet, an upper diffusion sheet, and a prism sheet which are laminated in this order from the bottom to the top.

The present invention also provides a display device including a backlight module, the backlight module includes a PCB board with a backlight and a reflective sheet attached to the inner surface of the PCB, and the reflective sheet is provided with a supply A through hole through which the backlight is disposed, the PCB board is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight and the edge of the through hole.

Preferably, the reflective layer is a reflective ink layer.

Preferably, the reflective ink layer is white or silver white.

Preferably, the material of the reflective ink layer comprises glass particles.

Preferably, the reflective ink layer has a thickness of 10 um to 40 um.

Preferably, the reflective ink layer has a thickness of 25 um to 40 um.

In the technical solution of the present invention, a reflective layer is disposed on a PCB board at a gap region between the outer edge of the backlight and the edge of the via hole, and the reflective layer has a reflective characteristic for the light, so compared with the current common cause The difference between the backlight and the reflective sheet leads to the bare exposure of the PCB in the gap region. Since the reflectivity of the reflective layer to the backlight is much higher than that of the PCB, the backlight can be emitted on the one hand. The light can be more reflected by the reflective layer, thereby improving the utilization of the backlight; on the other hand, the reflection of the light through the reflective layer can make the area of the original backlight having a lower brightness, that is, bare the PCB board. The brightness of the gap region is increased, thereby avoiding the backlight or bright or dark situation of the display device, thereby improving the uniformity of the backlight brightness of the display device, and the two aspects can improve the picture display quality of the display device.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain other drawings according to the structures shown in the drawings without any creative work.

1 is a cross-sectional structural view showing an embodiment of a backlight module of the present invention;

2 is a top plan view of the PCB board of FIG. 1;

Figure 3 is an enlarged schematic view of a portion A in Figure 1;

Figure 4 is an enlarged schematic view of the portion B in Figure 1.

Description of the reference numerals:

标号Label	名称name	标号Label	名称name
11	PCB板PCB board	22	背光源Backlight
21twenty one	LED灯LED light	22twenty two	透镜lens
33	反射片A reflective sheet	44	反光油墨层Reflective ink layer
55	扩散板Diffuser	66	光学膜片组件Optical diaphragm assembly
6161	下扩散片Lower diffuser	6262	上扩散片Upper diffuser
6363	棱镜片Prism sheet

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. 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 obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back, ...) in the embodiment of the present invention, the directional indication is only used to explain in a certain posture (as shown in the drawing) The relative positional relationship between the components, the motion situation, and the like, if the specific posture changes, the directional indication also changes accordingly.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of the "first", "second", etc. is used for the purpose of description only, and is not to be construed as an Its relative importance or implicit indication of the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.

The invention provides a backlight module for a display device.

Referring to FIG. 1 and FIG. 2, in an embodiment of the invention, the backlight module includes a PCB board 1 with a backlight 2 and a reflective sheet 3 attached to the inner surface of the PCB board 1. Specifically, in the embodiment, the display device having the backlight module is a direct type liquid crystal television (not shown). Wherein, the reflective sheet 3 is provided with a through hole through which the backlight 2 is disposed, and the PCB board 1 is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight 2 and the edge of the through hole. Specifically, in the embodiment, the reflective layer is the reflective ink layer 4.

In this embodiment, the reflective ink layer 4 is disposed on the PCB board 1 in the gap region between the outer edge of the backlight 2 and the edge of the via hole, and the reflective ink layer 4 mainly has a reflective characteristic for the light, so In the present invention, due to the difference in matching between the backlight 2 and the reflective sheet 3, the PCB board 1 is directly exposed in the gap region. In the technical solution of the present invention, the reflective ink layer 4 is emitted from the backlight 2 The reflectivity of the light is much higher than that of the PCB 1. Therefore, on the one hand, the light emitted by the backlight 2 can be more reflected by the reflective ink layer 4, thereby improving the utilization of the backlight 2; The reflection of the light by the reflective ink layer 4 can improve the brightness of the area where the brightness of the original backlight 2 is low, that is, the gap area where the PCB board 1 is exposed, thereby avoiding the backlight or the bright or dark situation of the display device. Furthermore, the uniformity of the backlight brightness of the display device is improved, and the combination of the two aspects can improve the picture display quality of the display device.

The present invention is not limited thereto. In other embodiments of the present invention, the reflective layer may also be designed as other reflective structures, such as, but not limited to, the reflective layer being a reflective film attached to the PCB 1. However, in contrast to the reflective film, the reflective ink layer 4 used in the present embodiment has a cost advantage, and because the reflective ink layer 4 can be attached to the PCB 1 by a simple screen printing process, it also has a process manufacturing. Convenience.

Referring to FIG. 1 and FIG. 3, in the embodiment, the backlight 2 preferably includes an LED lamp 21 and a lens 22 disposed on the LED lamp 21 for converting a point source into a surface light source. The lens 22 is formed through the through hole to reveal the reflection. Slice 3. It can be understood that, correspondingly, the gap area between the outer edge of the lens 22 and the edge of the through hole on the PCB board 1 should be the position where the reflective ink layer 4 is disposed. In addition, in this embodiment, the PCB board 1 is a package carrier of the backlight 2, and the plurality of backlights 2 are fixedly mounted on the PCB board 1 and the plurality of backlights 2 are on the PCB board 1 The arrays are arranged in an array at intervals to form a backlight 2 light source matrix, which is the arrangement of the backlight 2 in a conventional direct type liquid crystal television.

In order to further improve the utilization ratio of the backlight 2 and the uniformity of the backlight brightness, in the embodiment, the reflective ink layer 4 is preferably white or silver white. Of course, in other embodiments, when the reflective layer is a reflective film, the color of the reflective film may also be preferably white or silver white, because the LED lamp 21 generally used for display devices emits three primary colors. The mixed white light having a wavelength of 450 nm to 600 nm is mixed, and the white or silver white reflective layer has a high reflectance for the white light. However, the present invention is not limited thereto, and the color of the reflective ink layer 4 can be adjusted according to actual requirements, which is not limited by the present invention.

It should be particularly noted that, in order to achieve a better light reflection effect of the reflective ink layer 4, in the technical solution of the present invention, the material of the reflective ink layer 4 includes nanometers in addition to color materials, binders, and auxiliary agents. Grade of glass particles. It can be understood that, by virtue of the principle of lens refraction and concave spherical reflection, the glass particles can produce a high reflectance glare when the reflective ink layer 4 is irradiated by the backlight 2, which is much higher than the current common white. The reflectivity of the ink without glare. In addition, in the embodiment, the materials of the reflective ink layer 4 are preferably nano-scale, and the nano-scale composition of the reflective ink layer 4 can increase the heat radiation coefficient and heat conduction efficiency of the ink, so that the temperature of the PCB board 1 is lowered. The effect of the backlight 2 can be indirectly improved.

In the technical solution of the present invention, different reflectances are mainly achieved by adjusting the thickness of the reflective ink layer 4. Generally, the thickness of the reflective ink layer 4 is proportional to its reflectance. For example, when the thickness of the reflective ink layer 4 is 10 um to 40 um, the reflectance of the mixed white light emitted from the backlight 2 is 65 to 92%. The reflectance is greater than the reflectivity of the conventional PCB board 1 to the mixed white light. Of course, in the present embodiment, the thickness of the reflective ink layer 4 is preferably 25 um to 40 um. When the thickness of the reflective ink layer 4 is in this range, the reflectance of the mixed white light emitted from the backlight 2 can reach 85 to 92%, and the reflectance is substantially the same as or slightly lower than the reflectance of the conventional reflection sheet 3. The reflectivity of the sheet 3 is much higher than the reflectivity of the PCB board 1, so that the light emitted by the backlight 2 can be more reflected by the reflective ink layer 4, thereby improving the utilization ratio of the backlight 2 and the backlight. Uniformity of brightness. In addition, by comprehensively adjusting the thickness, color, and pattern shape of the reflective ink layer 4, it is also possible to control the intensity of the reflected light amount and control the reflective ink layer 4 to reflect light of different wavelengths, thereby adjusting the overall light color distribution of the backlight module. And light intensity.

Specifically, in order to make the thickness of the reflective ink layer 4 accurately controllable, the reflective ink layer 4 is preferably formed on the PCB 1 by silk screen printing. The thickness of the reflective ink layer 4 can be controlled by the number of screen printing and the number of printing times. . Of course, the reflective ink layer 4 can also be coated on the PCB 1. However, this method is not as good as the screen printing method for the thickness of the reflective ink layer 4, and the silk screen printing is a mature process, which is advantageous for mass production of the product.

In order to further improve the picture display quality of the display device, as shown in FIG. 1 and FIG. 4, the backlight module further includes a diffusion plate 5 disposed above the reflection sheet 3 for uniformly distributing light, and laminated on the diffusion. An optical film assembly 6 above the plate 5 for improving light distribution. Among them, the optical film assembly 6 includes a lower diffusion sheet 61, an upper diffusion sheet 62, and a prism sheet 63 which are laminated in this order from the bottom to the top. It can be understood that, in the technical solution of the present invention, the reflective sheet 3 and the reflective ink layer 4 together form a reflecting surface, and the region between the diffusing plate 5 and the reflecting surface is a light mixing region. The light color distribution of the light mixing region is obtained by mixing the light color of the LED lamp 21 of the lens 22, the reflective ink layer 4, and the light color reflected or absorbed by the reflection sheet 3, and can be adjusted according to actual needs. When the display device is in operation, light is refracted or reflected outwardly via the lens 22 via the LED lamp 21, and is reflected by the reflective ink layer 4 and the reflective sheet 3 at the bottom, and then uniform light is obtained via the diffuser 5 and the optical patch assembly 6. Type distribution. In addition, in the design of the present invention, in addition to adjusting the backlight wavelength by using the backlight module, it can also be used in combination with a filter (not shown) of the liquid crystal panel to perform overall correction on the backlight wavelength. The color gamut can be improved, and the overall display effect of the LCD TV is better.

The present invention also provides a display device, which includes a backlight module. The specific structure of the backlight module refers to the above embodiment. Since the display device adopts all the technical solutions of all the above embodiments, at least the above embodiment is provided. All the beneficial effects brought about by the technical solutions are not repeated here.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structural transformation, or direct/indirect use, of the present invention and the contents of the drawings are used in the inventive concept of the present invention. It is included in the scope of the patent protection of the present invention in other related technical fields.

Claims

A backlight module for a display device, comprising: a PCB board on which a backlight is fixed; and a reflective sheet attached to an inner surface of the PCB board, wherein the reflective sheet is provided with the backlight A through hole is formed, and the PCB board is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight and the edge of the through hole.
The backlight module of claim 1, wherein the reflective layer is a reflective ink layer.
The backlight module of claim 2, wherein the reflective ink layer is white or silver white.
The backlight module of claim 2, wherein the material of the reflective ink layer comprises glass particles.
The backlight module according to claim 4, wherein the glass particles have a particle size of the order of nanometers.
The backlight module of claim 2, wherein the reflective ink layer is formed on the PCB by silk screen printing.
The backlight module of claim 2, wherein the reflective ink layer has a thickness of 10 um to 40 um.
The backlight module of claim 7, wherein the reflective ink layer has a thickness of 25 um to 40 um.
The backlight module of claim 1 , wherein the reflective layer is a reflective film attached to the PCB.
The backlight module of claim 1 , further comprising a diffuser plate disposed above the reflective sheet for evenly distributing light, and laminated on the diffuser plate An optical film assembly for improving light distribution, the optical film assembly including a lower diffusion sheet, an upper diffusion sheet, and a prism sheet laminated in this order from bottom to top.
A display device, comprising: a backlight module, wherein the backlight module comprises a PCB board with a backlight and a reflective sheet attached to the inner surface of the PCB board, wherein the reflective sheet is provided with The backlight is provided with a through hole, and the PCB board is provided with a reflective layer for reflecting light in a gap region between the outer edge of the backlight and the edge of the through hole.
The display device of claim 11 wherein said reflective layer is a reflective ink layer.
The display device of claim 12 wherein said reflective ink layer is white or silver white.
The display device of claim 12 wherein the material of the reflective ink layer comprises glass particles.
The display device according to claim 14, wherein the glass particles have a particle size of the order of nanometers.
A display device according to claim 12, wherein said reflective ink layer is formed on said PCB by silk screen printing.
The display device according to claim 12, wherein said reflective ink layer has a thickness of 10 um to 40 um.
The display device according to claim 17, wherein said reflective ink layer has a thickness of 25 um to 40 um.
The display device according to claim 11, wherein the reflective layer is a reflective film attached to the PCB board.
The display device as claimed in claim 11 , wherein the backlight module further comprises a diffusion plate disposed above the reflective sheet for evenly distributing light, and a layer stacked above the diffusion plate. An optical film assembly that improves light distribution, the optical film assembly including a lower diffusion sheet, an upper diffusion sheet, and a prism sheet stacked in this order from bottom to top.