CN204879661U - Backlight unit and liquid crystal display panel - Google Patents

Abstract

The utility model discloses a backlight group and the liquid crystal display panel, it includes the backplate, the setting is in a PCB board and the 2nd PCB board on the backplate set up backlight on a PCB board and the 2nd PCB board, a PCB board lies in the edge all around of backplate is in the tilting state, the 2nd PCB board sets up the backplate is the inboard at edge all around to the level of being in tiling state. Because backlight on a PCB board and the 2nd PCB board, simultaneously a PCB board lies in the edge all around of backplate is in the tilting state to can adjust the direction of illumination of backlight among the liquid crystal display, thereby can improve the dark angle of the corner of backplate, and improve the efficiency and the picture is all spent together.

Description

Backlight module and liquid crystal display panel

technical field

The utility model relates to the field of display technology, in particular to a backlight source module and a liquid crystal display panel.

Background technique

At present, a liquid crystal display device (Liquid Crystal Display hereinafter referred to as LCD) has become the mainstream in the field of flat panel display. Since the liquid crystal display itself does not emit light, the backlight module is one of the key components of the LCD. The function of the backlight module is to provide sufficient brightness and uniform distribution of light so that it can display images normally. The current LCD backlight is mainly cold cathode tube CCFL and light emitting diode LED. As a new type of backlight, LED has many obvious advantages compared with the traditional CCFL backlight: LED backlight has a better color gamut, the internal driving voltage of LED is much lower than that of CCFL, the brightness adjustment range is large, power consumption and Safety is better than CCFL, coupled with longer life, short and light (about half the thickness of CCFL), environmental protection, safety and other characteristics, in recent years, it has emerged in the backlight of medium and large-sized liquid crystal displays, and has gradually replaced traditional CCFL. Backlight has become the development trend of mainstream backlight.

For liquid crystal display devices of medium and large sizes, people often use a direct-lit backlight structure to ensure certain performance requirements such as brightness and uniformity. In particular, the white LED direct-type backlight structure has less technical difficulty and is relatively simple to design and manufacture, and has become one of the common application modes. The direct-lit LED backlight technology is to arrange multiple LEDs in an array, place them behind the light guide plate and the LCD panel, and directly illuminate the LCD panel. Therefore, some direct-lit LED backlight components have regional backlight control technology, which can quickly fine-tune the brightness of LED lights in each area according to the brightness changes of different parts of the screen, thereby greatly improving the dynamic contrast of the screen.

However, due to reasons such as the arrangement of LEDs in the backlight module and the limited light-emitting angle of LEDs, the energy efficiency and picture uniformity of direct-lit liquid crystal display devices are low, and the four-corner brightness of liquid crystal products is low.

Utility model content

In order to solve the problems of low energy efficiency and picture uniformity of the direct-lit liquid crystal display device, the embodiment of the present invention provides a backlight source module and a liquid crystal display panel.

The embodiment of the present invention provides a backlight module, which includes a backboard, a first PCB board and a second PCB board arranged on the backboard, and a first PCB board and a second PCB board arranged on the first PCB board and the second PCB board The backlight source, the first PCB board is located at the peripheral edge of the backboard and is in a tiltable state, and the second PCB board is arranged on the inner side of the peripheral edge of the backboard and is in a horizontally tiled state.

Preferably, in the embodiment of the present utility model, the first PCB board and the second PCB board are detachable from each other.

Preferably, in the embodiment of the present utility model, the first PCB board is a flexible printed circuit board, and the second circuit board is a non-flexible printed circuit board.

Preferably, in the embodiment of the present utility model, an adjustment mechanism is provided on the back plate, and the adjustment mechanism is used to make the first PCB board in a tiltable state.

Preferably, in the embodiment of the present utility model, the adjustment mechanism is an adjustment bolt, and the first PCB board is placed in a tiltable state by screwing the adjustment bolt into the backboard along a direction.

Preferably, in the embodiment of the present utility model, the adjustment structure includes a first adjustment bolt and a second adjustment bolt, by alternatively screwing the first adjustment bolt or the second adjustment bolt into the direction of the back plate , so that the first PCB board is in different inclined states.

Preferably, in the embodiment of the present utility model, the backlight source may be a point light source or a line light source.

Preferably, in the embodiment of the present utility model, the point light source is an LED crystal grain, and the line light source is an LED light bar.

Preferably, in the embodiment of the present utility model, the backlight is fixed to the first PCB board and the second PCB board by bonding or locking.

An embodiment of the present invention provides a liquid crystal display panel, which includes the backlight module in any one of the above embodiments.

In this embodiment, due to the backlight on the first PCB board and the second PCB board, and the first PCB board is located at the peripheral edge of the back board and is in a tiltable state, so that the liquid crystal display can be adjusted. The irradiation direction of the backlight source can improve the vignetting at the corner of the backplane, and improve the energy efficiency and picture uniformity.

Description of drawings

Fig. 1 is a schematic diagram of a vertical cross-sectional structure of a backlight module according to Embodiment 1 of the present utility model;

Fig. 2 is a schematic diagram of a vertical cross-sectional structure of a backlight module according to Embodiment 2 of the present invention;

3 is a schematic diagram of a vertical cross-sectional structure of a backlight module according to Embodiment 3 of the present invention;

Figure 4 is a schematic diagram of test points for national standard brightness uniformity and energy efficiency;

FIG. 5 is a schematic diagram of a vertical cross-sectional structure of a backlight module according to Embodiment 4 of the present invention.

Detailed ways

Below in conjunction with accompanying drawing of the utility model, further illustrate the concrete realization of the utility model.

Fig. 1 is a schematic diagram of a vertical cross-sectional structure of a backlight module according to Embodiment 1 of the present utility model; , the backplane 101 is provided with a first PCB board 102 and a second PCB board 103, the first PCB board 102 and the second PCB board 103 are provided with a backlight source 104, and the first PCB board 102 is located at The surrounding edge of the backplane 101 is in a tiltable state, so as to adjust the direction of light irradiation and change the intensity of light in a certain direction. The second PCB board 103 is arranged on the inner side of the surrounding edge of the backplane 101, and Tiled horizontally, creating an evenly irradiated light.

In this embodiment, both the first PCB board 102 and the second PCB board 103 are non-flexible printed circuit boards, and can be physically separated from each other.

In this embodiment, the backlight source 104 may be a point light source or a line light source. Specifically, the point light source 104 is an LED crystal grain, and the line light source is an LED light bar.

In this embodiment, the backlight source 104 is fixed on the first PCB board and the second PCB board by welding or locking. For example, LED dies are usually soldered on the PCB.

Fig. 2 is a schematic diagram of a vertical sectional structure of a backlight module according to Embodiment 2 of the present invention; as shown in Fig. 2 , it includes a backplane 101, a first PCB 102, a second PCB 103, and a backlight 104; The difference between the above embodiments is that among the first PCB board 102 and the second PCB board 103, the first PCB board 102 is a flexible printed circuit board, and the second PCB board 103 is a non-flexible printed circuit board. Since the first PCB board 102 is a flexible printed circuit board, it can be directly bent and shaped into a desired tilted state, such as tilting toward the inside or outside of the backlight board.

In this embodiment, the first PCB board 102 is a flexible printed circuit board, and the second PCB board 103 is a non-flexible printed circuit board.

Fig. 3 is a schematic diagram of a vertical sectional structure of a backlight module according to Embodiment 3 of the present utility model; The difference between the above embodiments is that an adjustment mechanism is provided on the back plate, and the adjustment mechanism is used to make the first PCB board in a tiltable state.

Specifically, the adjustment mechanism is an adjustment bolt, and the first PCB board is placed in a tiltable state by screwing the adjustment bolt into the backboard along a direction. Preferably, in this embodiment, the adjustment structure includes a first adjustment bolt 115 and a second adjustment bolt 125, by screwing the first adjustment bolt 115 into the direction of the backboard, the first PCB board 102 is in a state of inclination towards the backplane, so as to at least increase the brightness value of the test point, thereby improving the image uniformity and energy efficiency of the backlight source.

See Figure 4, which is a schematic diagram of the test points for the national standard brightness uniformity and energy efficiency. There are 9 test points in total. The test point located on the edge is the backlight source N/9 from the edge of the backplane, and N is the side length of the backplane. The solution shown in Figure 3 at least makes the edge LED lighting angle closer to the test point (1/9 point) on the edge of the TV, thereby improving the image uniformity and energy efficiency of the backlight.

Fig. 5 is a schematic diagram of a vertical cross-sectional structure of the backlight module of Embodiment 4 of the present utility model; the difference from the embodiment in Fig. 3 above is that in this embodiment, by screwing the second adjusting bolt 125 into the The direction of the board makes the first PCB board 102 in a state of inclination towards the outside of the backplane, so as to at least increase the brightness of the display corners and improve the vignetting of the edges.

It should be noted that, in the above embodiment, a diffusion plate, a diffusion film, a brightness enhancement film, a reflection film, etc. can also be provided above the backlight source. For the configuration of these structural components, please refer to the CN102287722A patent, and details will not be repeated here.

An embodiment of the present invention provides a liquid crystal display panel, which includes the backlight module in any one of the above embodiments. No more details.

In the above embodiments of the present invention, due to the backlight on the first PCB board and the second PCB board, and at the same time, the first PCB board is located at the edge of the back board and is in a tiltable state, so that it can be adjusted The irradiation direction of the backlight source in the liquid crystal display can improve the vignetting at the corner of the back panel, and improve the energy efficiency and picture uniformity.

Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. In this way, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and equivalent technologies thereof, the utility model is also intended to include these modifications and variations.

Claims (10)

1. A backlight module, characterized in that it comprises a backplane, a first PCB and a second PCB arranged on the backplane, a backlight arranged on the first PCB and the second PCB The first PCB board is located at the peripheral edge of the backboard and is in a tiltable state, and the second PCB board is arranged inside the peripheral edge of the backboard and is in a horizontally tiled state. 2. The backlight module according to claim 1, wherein the first PCB board and the second PCB board are detachable from each other. 3. The backlight module according to claim 1, wherein the first PCB is a flexible printed circuit board, and the second PCB is a non-flexible printed circuit board. 4. The backlight module according to claim 1, wherein an adjustment mechanism is provided on the back panel, and the adjustment mechanism adjusts the first PCB board to be in a tiltable state. 5. The backlight module according to claim 4, wherein the adjustment mechanism is an adjustment bolt, and the first PCB is placed in the position of the first PCB by screwing the adjustment bolt into the backplane along the direction Can be tilted. 6. The backlight module according to claim 5, wherein the adjusting structure comprises a first adjusting bolt and a second adjusting bolt, and the first adjusting bolt is adjusted by adjusting the first adjusting bolt or the second adjusting bolt. Or the second adjusting bolt is screwed into the direction of the backboard, so that the first PCB board is in different inclined states. 7. The backlight module according to claim 1, wherein the backlight source can be a point light source or a line light source. 8. The backlight module according to claim 7, wherein the point light sources are LED crystal grains, and the line light sources are LED light bars. 9. The backlight module according to claim 1, wherein the backlight is fixed to the first PCB and the second PCB by bonding or locking. 10. A liquid crystal display panel, characterized in that it comprises the backlight module according to any one of claims 1-9.