CN106647021A - Direct type backlight module - Google Patents

Abstract

The embodiment of the invention provides a direct type backlight module, which comprises a back plate, a backlight source arranged in the back plate and a diffusion plate arranged in the back plate and positioned above the backlight source, wherein the back plate is provided with an accommodating cavity which is sunken towards the inner side of the back plate, and the backlight source is distributed on two sides of the accommodating cavity. According to the embodiment of the invention, the back plate is provided with the accommodating cavity for placing the PCB, so that the thickness of the whole machine can be effectively reduced.

Description

Direct type backlight module

Technical field:

The invention relates to the field of liquid crystal displays, in particular to a direct-lit backlight module.

Background technique:

The liquid crystal display device has many advantages such as a thin body, power saving, and no radiation, and has been widely used. Most of the conventional liquid crystal display devices are backlight liquid crystal display devices, which include a liquid crystal panel and a backlight module. The working principle of the liquid crystal panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The direction of the liquid crystal molecules is controlled by electrifying or not, and the light of the backlight module is refracted. Come out to generate the picture. Since the liquid crystal panel itself does not emit light, the light source provided by the backlight module is needed to display images normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device. The backlight module can be divided into direct type and edge type according to the incident position of the light source. The direct type backlight module is to arrange the backlight such as CCFL (Cold Cathode Fluorescent Lamp, cold cathode fluorescent lamp) or LED (Light Emitting Diode, light-emitting diode) behind the liquid crystal panel to directly form a surface light source for the liquid crystal panel.

The direct-lit backlight module has the advantages of simple structure, low cost, high brightness, high uniformity, and precise backlight control, and has a greater advantage in the competition with edge-lit backlight modules. But the shortcomings are also very obvious. The thickness of the direct-type backlight module itself is relatively large, especially for larger modules of the OD (light mixing distance) type. In order to make it fully mix light, a higher module thickness is required, especially However, after adding components such as the PCB board and the back cover, the thickness of the whole machine is too large and the appearance is not good, which runs counter to the existing trend of thinning.

Invention content:

In order to solve the above-mentioned problems in the prior art that the direct-type backlight module has a large thickness and poor appearance, the present invention provides a direct-type backlight module, which can effectively solve the problem of excessive thickness of the direct-type backlight module , more beautiful, and can greatly reduce the cost of the whole machine.

The technical solution adopted by the present invention to solve its technical problems is:

The direct-type backlight module includes a backplane, a backlight installed in the backplane, and a diffusion plate installed in the backplane and above the backlight. The backplane is provided with an accommodating cavity sunken toward its inner side. The backlight source is distributed on both sides of the accommodating cavity.

As for the above-mentioned direct-type backlight module, the accommodating cavity is provided with a fixed structure, and the direct-type backlight module also includes a PCB board and a cover board arranged on the backplane, and the PCB board is placed In the accommodating cavity and fixed with the fixing structure, the cover plate covers the accommodating cavity.

According to the above-mentioned direct-type backlight module, the direct-type backlight module further includes a reflective structure disposed between the backplane and the backlight source.

In the direct type backlight module mentioned above, the reflective structure is a reflective layer coated on the backplane.

In the above-mentioned direct type backlight module, the reflective structure is a reflective sheet arranged between the backlight source and the backplane.

In the direct type backlight module described above, the fixing structure is a screw post provided on the accommodating cavity, and the PCB board is fixed on the accommodating cavity through the cooperation of the screw and the screw post.

In the direct-type backlight module as described above, the fixing structure is a plurality of guide posts arranged on the accommodating cavity, and a plurality of guide holes corresponding to the guide posts are opened on the PCB board, and the PCB board It is fixed on the accommodating chamber through the cooperation of the guide hole and the guide post.

In the direct type backlight module described above, the depth of the accommodating cavity is determined by the light mixing distance of the back plate, and is adapted to the thickness of the PCB board.

In the above-mentioned direct type backlight module, a liquid crystal panel is provided on the side of the diffusion plate opposite to the side where the reflective structure is located, and an optical film group is provided between the liquid crystal panel and the diffusion plate. The above-mentioned backlight source is an LED light bar.

In addition, the present invention also provides a liquid crystal display device, comprising the above-mentioned direct-lit backlight module.

Compared with the prior art, the beneficial effect of the direct-lit backlight module of the present invention is that the backplane is provided with an accommodating cavity for the PCB board, which can effectively reduce the thickness of the whole machine itself; at the same time, the PCB board is placed After the accommodating cavity, the cover plate only covers the accommodating cavity part, which can reduce the cost of the rear cover and the installation cost, thereby reducing the cost of the whole machine.

Description of drawings:

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic side view of a direct type backlight module of the present invention;

FIG. 2 is a schematic plan view of the direct-lit backlight module of the present invention.

detailed description:

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to accompanying drawings 1 and 2, a direct type backlight module includes a backplane 2, a backlight 1 installed in the backplane and a diffusion plate installed in the backplane and above the backlight. In this embodiment, the backlight source is an LED light bar, and the LED light bar includes several LED lights, and the several LED lights are evenly spaced on the LED light bar. During specific implementation, the LED light bar can also be replaced by CCFL. An accommodating cavity 5 sunken toward the inner side is provided on the back plate, and the LED light strips are distributed on both sides of the accommodating cavity. In this embodiment, the accommodating cavity 5 is provided with a fixed structure, and the direct type backlight module further includes a PCB board 4 and a cover board 3 arranged on the back board, and the PCB board is placed on the The accommodating cavity is fixed in cooperation with the fixing structure, and the cover plate is used to cover the accommodating cavity. In this implementation, by placing the PCB board in the accommodating cavity, the thickness of the module itself can be effectively reduced; at the same time, after the PCB board is placed in the accommodating cavity, the cover plate only covers the part of the accommodating cavity, which can reduce the cost of the cover plate and Installation costs, thereby reducing the cost of the whole machine.

Further, the direct-lit backlight module further includes a reflective structure disposed between the back plate and the backlight source, and a liquid crystal panel is provided on the diffuser plate opposite to the side where the reflective structure is located, An optical film group is arranged between the liquid crystal panel and the diffusion plate. In this embodiment, the reflective structure is a reflective layer coated on the back plate, and the light emitted by the backlight enters the diffuser plate directly or after being reflected by the reflective layer, and finally enters the optical film group to provide a uniform Surface light source to improve light utilization. The depth of the accommodating cavity is determined by the light mixing distance of the back plate, and is adapted to the thickness of the PCB board. In this embodiment, the depth of the accommodating cavity is obtained after a comprehensive evaluation of the optical structure, which is mainly determined by the effect of the module to ensure the optical performance of the backlight module and ensure the application requirements of uniformity, no light leakage, no polarization, and simultaneous brightness enhancement; The board is required to be slender and low in thickness, and the terminals can be led out through side-out and back-out methods. The size of the PCB board is mainly determined by the module OD, and the adjustable range is large.

Further, the accommodating cavity 5 is formed by metal stamping or injection molding, which has a simple structure and is convenient to manufacture. In this embodiment, the fixing structure is a screw post provided on the accommodating cavity, and the PCB board 4 is fixed on the accommodating cavity through the cooperation of the screw and the screw post, which is convenient for disassembly and replacement. During specific implementation, the fixed structure may also be a plurality of guide posts or buckles arranged on the accommodating cavity. When the fixed structure is a guide post, several guide posts corresponding to the guide post are provided on the PCB. hole, the PCB board is fixed on the accommodating chamber through the cooperation of the guide hole and the guide post; when the fixing structure is a buckle, the PCB board is buckled to fix it on the accommodating chamber, and the structure is simple.

In this embodiment, the backboard 2 is provided with a surface frame that cooperates with the side wall of the backboard through buckles or screws. It is beneficial to fix the backplane and the optical film group and ensure the imaging quality of the liquid crystal panel.

As an alternative preferred embodiment, the difference from the above embodiment is that the reflective structure is a reflective sheet arranged between the diffuser plate and the back plate, for The light is reflected back to the diffusion plate, and the unscattered light source is reflected and then enters the light transmission area, so as to improve the utilization rate of light.

In addition, the present invention also provides a liquid crystal display device, comprising the above-mentioned direct type backlight module.

In the direct-type backlight module of the present invention, the back plate is provided with an accommodating cavity for placing the PCB board, which can effectively reduce the thickness of the whole machine itself; at the same time, after the PCB board is placed in the accommodating cavity, the cover plate only covers the accommodating cavity. The cavity part can reduce the cost of the rear cover and the installation cost, thereby reducing the cost of the whole machine.

The foregoing is one or more implementation modes provided in conjunction with specific content, and it is not considered that the specific implementation of the present invention is limited to these descriptions. Any approach or similarity to the methods and structures of the present invention, or some technical deduction or replacement based on the concept of the present invention shall be regarded as the scope of protection of the present invention.

Claims (10)

1. A direct-type backlight module, including a backplane, a backlight installed in the backplane, and a diffusion plate installed in the backplane and above the backlight, characterized in that: the backplane is provided with a depression toward its inner side The accommodating cavity, the backlight is distributed on both sides of the accommodating cavity. 2. The direct-type backlight module according to claim 1, wherein a fixed structure is provided in the accommodating cavity, and the direct-type backlight module further comprises a PCB board arranged on the backplane and a cover plate, the PCB board is placed in the accommodating cavity and fixed with the fixing structure, and the cover plate covers the accommodating cavity. 3 . The direct-type backlight module according to claim 1 , wherein the direct-type backlight module further comprises a reflective structure disposed between the backplane and the backlight. 4 . 4. The direct type backlight module according to claim 3, wherein the reflective structure is a reflective layer coated on the backplane. 5 . The direct-lit backlight module according to claim 3 , wherein the reflective structure is a reflective sheet disposed between the backlight source and the backplane. 6 . 6. The direct type backlight module according to claim 2, characterized in that: the fixing structure is a screw post arranged on the accommodating cavity, and the PCB board is fixed on the on the container. 7. The direct-lit backlight module according to claim 2, wherein the fixing structure is a plurality of guide posts arranged on the accommodating cavity, and there are guide posts corresponding to the guide posts on the PCB. There are several guide holes, and the PCB board is fixed on the accommodating cavity through the cooperation of the guide holes and the guide posts. 8 . The direct type backlight module according to claim 2 , wherein the depth of the accommodating cavity is determined by the light mixing distance of the back plate, and is adapted to the thickness of the PCB. 9. The direct-lit backlight module according to claim 3, wherein a liquid crystal panel is provided on the diffuser plate opposite to the reflective structure, and the liquid crystal panel is connected to the diffuser plate An optical film group is arranged between them, and the backlight source is an LED light bar. 10. A liquid crystal display device, characterized by comprising the direct-lit backlight module according to any one of claims 1-9.