CN105204107B - Liquid crystal display device and its backlight module - Google Patents

Abstract

The invention discloses a kind of liquid crystal display device and its backlight modules, including light guide plate, multiple light sources component and the optical diaphragm group in framework and framework, array offers multiple first through hole identical with light source assembly quantity on light guide plate, light source assembly includes having the light source fixed part of annular sidewall and being fixed on the plurality of LEDs lamp bead of the sidewall surfaces of light source fixed part, and light source fixed part is inserted in first through hole.The invention also discloses a kind of liquid crystal display devices.Light source assembly is arranged to the light source fixed part with annular sidewall, the sidewall surfaces of light source fixed part are fixed with plurality of LEDs lamp bead, the array first through hole identical with light source assembly quantity on light guide plate, light source fixed part is inserted in first through hole, the light that LED lamp bead is sent out is incident upon along 360 ° of the inner wall of first through hole in light guide plate, such design method has both the advantage that side entering type enters light and straight-down negative enters light, can meet the needs of ultrathin design and local dimming design simultaneously.

Description

Liquid crystal display device and its backlight module

technical field

The invention relates to the field of display technology, in particular to a liquid crystal display device and a backlight module thereof.

Background technique

In liquid crystal displays, since the liquid crystal screen itself does not emit light, it needs to be equipped with a backlight. Most of the current mainstream display backlight technologies use LEDs as the backlight source, and the backlight source is mainly divided into direct-type and side-type according to its installation form in the display.

The direct type refers to making the LED into a dense dot matrix and placing it behind the screen to directly illuminate the screen; the side type refers to placing the LED backlight on the side of the screen, and the light source illuminates the light guide plate to light up the entire screen on the back, so that the entire screen is lit up.

However, these two architectures have advantages and disadvantages. Since the light emission angle of the LED itself is not large, the distribution density of LEDs in the direct-lit backlight method is very large, and there is no obvious advantage in cost, but it can achieve block-based backlight brightness control. So as to realize local dimming (regional dimming) design. In order to reduce the cost, the direct-lit backlight method usually uses high-power LEDs equipped with secondary lenses to achieve a certain brightness requirement. Although the number of LEDs can be reduced, this method has considerable difficulty in achieving ultra-thin designs. At the same time, due to the use of With the secondary lens, the local dimming design using the backlight also becomes impossible, which affects the image quality.

The edge-type backlight design is usually used in high-end models because it can achieve ultra-thin design. This way of using the light guide plate for light transmission can well solve the optical quality problems such as light shadows that may exist in the direct-lit backlight design. However, its shortcomings are also obvious, and the local dimming function cannot be realized.

Contents of the invention

In view of the deficiencies in the prior art, the present invention provides an ultra-thin liquid crystal display device and a backlight module thereof that can be easily adjusted locally.

In order to achieve the above object, the present invention adopts the following technical solutions:

A backlight module, comprising a frame body and a light guide plate in the frame, a plurality of light source components and an optical film group, the array on the light guide plate is provided with a plurality of first through holes having the same number as the light source components, The light source assembly includes a light source fixing part with an annular side wall and a plurality of LED lamp beads fixed on the surface of the side wall of the light source fixing part, the light source fixing part is inserted into the first through hole, and the The end of the LED lamp bead is facing the inner wall of the first through hole.

Wherein, the light source assembly further includes a bottom plate connected to the light source fixing part, and the bottom plate is fixed on the bottom surface of the frame body.

Wherein, the light source fixing part is an annular cooling plate, and the LED lamp bead is fixed on the outer ring surface of the light source fixing part through the LED substrate.

Alternatively, the light source fixing part is an annular circuit board.

Wherein, the backlight module further includes a diffusion plate, and the diffusion plate is arranged between the light guide plate and the optical film group.

Wherein, the backlight module further includes a shading member, and the shading member is sealed between the top of the light source fixing part and the first through hole.

Wherein, the backlight module further includes a reflective sheet closely attached to the bottom of the light guide plate, and a second through hole is correspondingly opened on the reflective sheet.

Wherein, the diameter of the second through hole is larger than that of the first through hole.

Alternatively, the diameter of the second through hole is smaller than that of the first through hole, and the reflective sheet further includes a folded portion close to the inner wall of the first through hole; the inner surface of the side wall of the light source fixing portion It is a reflective surface, and the lower part of the light source fixing part is provided with a plurality of light-transmitting windows.

Another object of the present invention is to provide a liquid crystal display device, comprising a liquid crystal panel and the above-mentioned backlight module.

In the backlight module of the present invention, a plurality of first through holes having the same number as the light source components are arrayed on the light guide plate. One LED lamp bead, the light source fixing part is inserted in the first through hole, and the light emitted by the annularly distributed LED lamp beads enters the light guide plate at 360° along the inner wall of the first through hole. The advantages of direct light input and direct light input can meet the needs of ultra-thin design and regional dimming design at the same time.

Description of drawings

FIG. 1 is a schematic structural diagram of a liquid crystal display device according to Embodiment 1 of the present invention.

FIG. 2 is a partial cross-sectional view of a liquid crystal display device according to Embodiment 1 of the present invention.

Fig. 3 is a front view of the light source assembly according to Embodiment 1 of the present invention.

4 is a top view of a light source assembly and a light guide plate according to Embodiment 1 of the present invention.

5 is a partial cross-sectional view of a liquid crystal display device according to Embodiment 2 of the present invention.

Fig. 6a is a front view of a light source assembly according to Embodiment 2 of the present invention.

Fig. 6b is a front view of another light source assembly according to Embodiment 2 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, 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.

Example 1

Referring to Fig. 1, the liquid crystal display device of the present invention comprises a liquid crystal panel 1 and a backlight module (not marked) which provides a backlight at its bottom, the backlight module comprises a frame body 10 and a light guide plate 20 in the frame body 10, several light source assemblies 30 and The optical film set 40, the light guide plate 20 is arrayed with a plurality of first through holes 200 having the same number as the light source assembly 30, referring to Fig. 2 and Fig. A plurality of LED lamp beads 300 on the side wall surface of the light source fixing part 31 and the bottom plate 32 vertically connected to the light source fixing part 31, the light source fixing part 31 is inserted in the first through hole 200, and the end of the LED lamp bead 300 faces the first through hole 200. On the inner wall of a through hole 200 , the bottom plate 32 is fixed on the bottom surface of the frame body 10 to fix the light source assembly 30 on the frame body 10 .

Through such an arrangement, the LED lamp bead 300 is fixed in the first through hole 200, and by setting the end of each LED lamp bead 300 to face the light guide plate 20, the light source assembly 30 can be drawn from the first through hole 200 along a 360° direction. The inner wall is injected into the light guide plate 20, so that the illumination of the light guide plate 20 is uniform and has good consistency. At the same time, regional dimming can also be realized by adjusting the brightness of the corresponding LED lamp beads 300, which has both side-type light input and direct-type light input. The advantages of light.

The light guide plate 20 of this embodiment is square, and is divided into a plurality of sub-light guide plates, and each sub-light guide plate is provided with a first through hole 200 in the middle. As shown in FIG. 4 , the light source fixing part 31 of this embodiment is an annular heat sink, and the LED lamp bead 300 is fixed on the outer ring surface of the light source fixing part 31 through the LED substrate. The light source fixing part 31 can also be an annular flexible circuit board.

The diffusion plate 50 is disposed between the light guide plate 20 and the optical film set 40 , and the light emitted by the backlight module can be further uniformed through the diffusion plate 50 and transmitted to the liquid crystal panel 1 to form an image.

Further, the top of the light source fixing part 31 is fixed with an annular light-shielding member S, and the light-shielding member S is sealed between the top of the light source fixing part 31 and the first through hole 200, which can prevent part of the light emitted by the LED lamp bead 300 from emitting from above to cause Light leakage phenomenon, the shade S of this embodiment is made of rubber. It can be understood that, in other implementation manners, the shading member S can also be integrally formed with the light source assembly 30 .

As shown in Figure 2, the bottom of the light guide plate 20 is pasted with a reflective sheet 60 with scattering dots, and the reflective sheet 60 is correspondingly provided with a second through hole 600, the diameter of the second through hole 600 is larger than the first through hole 200, that is, the light guide plate 20 The part near the near beam side is not provided with a reflective sheet, which reduces the risk of light leakage on the near beam side.

Example 2

As shown in FIG. 5 and FIG. 6 a , the difference from Embodiment 1 is that the structures of the reflecting sheet 60 and the light source fixing part 31 of this embodiment are different. The diameter of the second through hole 600 is smaller than that of the first through hole 200 , and the reflective sheet 60 also has a folded portion 60 a closely attached to the inner wall of the first through hole 200 , and the folded portion 60 a is formed as a cylinder with a reflective function. At the same time, the inner surface of the side wall of the light source fixing part 31 is a reflective surface, and a plurality of light-transmitting windows 310 with a through-hole structure adjacent to the LED lamp bead 300 are opened on the lower part of the light source fixing part 31 close to the bottom plate 32, facing downward The emitted light can be emitted from the light-transmitting window 310 , and the lack of light intensity in the middle of the light source assembly 30 can be made up for after multiple reflections. The ring surface of the light source fixing portion 31 is in close contact with the inner wall of the second through hole 600 of the reflector 60 to avoid light leakage at the bottom. Figure 6b is another structure of the light source assembly 30 of this embodiment. In this solution, the light-transmitting window 310 is provided at intervals in the circumferential direction of the light source fixing part 31. Multiple notches, so that two adjacent LEDs A light-transmitting window 310 is formed between the lamp beads 300 .

In this way, the light irradiated by the LED lamp bead 300 to the lower part of the light guide plate 20 passes through the folded portion 60a, the part of the reflective sheet 60 protruding from the light guide plate 20 (not shown) and the inner wall of the light source fixing portion 31. 31 is emitted to the diffusion plate 50, which solves the defect that there may be a dark shadow in the middle of the light source fixing part 31.

By arraying a plurality of first through holes with the same number as the light source assembly on the light guide plate, the light source assembly is set as a light source fixing part with an annular side wall, and a plurality of LED lamp beads are fixed on the side wall surface of the light source fixing part , the light source fixing part is inserted in the first through hole, and the light emitted by the annularly distributed LED lamp beads enters the light guide plate at 360° along the inner wall of the first through hole. And the advantages of direct light input can meet the needs of ultra-thin design and regional dimming design at the same time.

The above description is only the specific implementation of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, some improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims (7)

1. a kind of backlight module, which is characterized in that including the light guide plate (20), multiple in framework (10) and the framework (10) Light source assembly (30), optical diaphragm group (40) and the reflector plate (60) for being tightly attached to the light guide plate (20) bottom, the light guide plate (20) array offers multiple first through hole (200) identical with the light source assembly (30) quantity, the light source assembly on (30) include the more of the sidewall surfaces that there is the light source fixed part (31) of annular sidewall and be fixed on the light source fixed part (31) LED lamp bead (300), the light source fixed part (31) is inserted in the first through hole (200), and the LED lamp bead (300) End towards the first through hole (200) inner wall；The light source fixed part (31) is tube structure, the light source fixed part (31) inner surface of side wall is reflecting surface, and the lower part of the light source fixed part (31) offers multiple light inlet windows (310)；Institute It states correspondence on reflector plate (60) and offers the second through-hole (600), including be close to the first through hole (200) inner wall, there is reflection The diameter of the folding portion (60a) of function, second through-hole (600) is less than the first through hole (200)；The LED lamp bead (300) light for being irradiated to the lower part of the light guide plate (20) passes through the folding portion (60a) successively, the reflector plate (60) is stretched After going out part and the reflection of the light source fixed part (31) inner wall of the light guide plate (20), from the top of the light source fixed part (31) It projects in portion.

2. backlight module according to claim 1, which is characterized in that the light source assembly (30) further includes the connection light The bottom plate (32) of source fixed part (31), the bottom plate (32) are fixed on the framework (10) bottom surface.

3. backlight module according to claim 1, which is characterized in that the light source fixed part (31) is the heat dissipation of annular Plate, the LED lamp bead (300) are fixed on the outer ring surface of the light source fixed part (31) by LED substrate.

4. backlight module according to claim 1, which is characterized in that the light source fixed part (31) is the circuit of annular Plate.

5. backlight module according to claim 1, which is characterized in that further include diffuser plate (50), the diffuser plate (50) Between the light guide plate (20) and the optical diaphragm group (40).

6. according to any backlight modules of claim 1-5, which is characterized in that further include shading piece (S), the shading piece (S) it is enclosed at the top of the light source fixed part (31) between the first through hole (200).

7. a kind of liquid crystal display device, which is characterized in that including any backlight of liquid crystal display panel (1) and claim 1-6 Module.