CN220603812U

CN220603812U - Backlight module and display device

Info

Publication number: CN220603812U
Application number: CN202321882997.9U
Authority: CN
Inventors: 王伟宏; 姚君乐; 罗增昌; 刘三妹; 叶海霞
Original assignee: Huizhou Wai Chi Electronics Co ltd
Current assignee: Huizhou Wai Chi Electronics Co ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2024-03-15
Anticipated expiration: 2033-07-17

Abstract

The utility model relates to a backlight module and a display device, wherein the backlight module comprises: bottom plate, the lamp plate, the inside casing, the diffuser plate, first optics diaphragm and press the frame, set up a plurality of lamp pearl groups on the lamp plate, the cooperation IC chip adjusts the luminance of each lamp pearl group according to input signal, can realize the subregion regulation and control and show, be provided with first step on through the inside casing, be provided with the second step on the first step, and the width of second step is less than the width of first step, first step gomphosis is in the first spacing inslot of diffuser plate, the second step gomphosis is in the second spacing inslot of first optics diaphragm, fix diffuser plate and first optics diaphragm respectively with the mode of classifying dislocation, can avoid appearing not hard up trip's condition, can avoid the condition that dislocation appears in the mutual movement between diffuser plate and the first optics diaphragm, the diffuser plate has even optical enhancement effect, backlight unit's display effect is better, backlight unit's optical taste has been improved.

Description

Backlight module and display device

Technical Field

The present utility model relates to the field of liquid crystal backlight, and in particular, to a backlight module and a display device.

Background

At present, the LED backlight source technology is widely used for displaying instruments in automobiles because of long service life and low power consumption, common backlight modules are flexible circuit boards with LEDs welded on one side or two sides of a diffusion plate in a fixed mode, and when light beams emitted by the LEDs pass through saw-tooth reticulation and cylindrical lattice points on the diffusion plate, the light beams are uniformly distributed on the diffusion plate, so that the display of automobile instrument panels is realized.

In the conventional backlight module, in order to improve the optical effect, it is generally necessary to install a diffusion plate and attach optical films such as a light-diffusing film and a light-intensifying film to the diffusion plate, but after each optical film is attached to the diffusion plate, the diffusion plate is easily displaced, and the optical films on the diffusion plate are also easily dislocated, so that the display effect of uneven brightness on the diffusion plate is generated.

Disclosure of Invention

Based on this, it is necessary to provide a backlight module and a display device.

The technical scheme for solving the technical problems is as follows: a backlight module, comprising: the device comprises a bottom plate, a lamp panel, an inner frame, a diffusion plate, a first optical film and a pressing frame;

the base plate is provided with a mounting groove, the lamp panel is arranged in the mounting groove, a plurality of lamp bead groups are arranged on the first surface of the lamp panel, an IC chip is arranged on the second surface of the lamp panel, and the IC chip is electrically connected with each lamp bead group;

the first surface of the inner frame is connected with the first surface of the lamp panel, the second surface of the inner frame is provided with a first step, the first step is provided with a second step, the width of the second step is smaller than that of the first step, the diffusion plate is provided with a first limit groove, the first surface of the diffusion plate is connected with the second surface of the inner frame, the first step is embedded in the first limit groove, the first optical film is provided with a second limit groove, the first surface of the first optical film is connected with the second surface of the diffusion plate, the first surface of the first optical film is connected with the first step, and the second step is embedded in the second limit groove;

the pressing frame is movably connected with the side wall of the bottom plate, and is movably abutted with the second surface of the first optical film.

In one embodiment, the backlight module further includes: the second optical film is provided with a third step, the width of the third step is smaller than that of the second step, a third limit groove is formed in the second optical film, the first face of the second optical film is connected with the second face of the first optical film, the first face of the second optical film is connected with the second step, and the third step is embedded in the third limit groove.

In one embodiment, a limiting post is disposed on the second face of the inner frame, a first limiting groove is formed in the diffusion plate, and the limiting post is disposed in the first limiting groove.

In one embodiment, the first optical film is provided with a second limiting groove, and the limiting column is arranged in the second limiting groove.

In one embodiment, a third limiting groove is formed in the second optical film, and the limiting column is arranged in the third limiting groove.

In one embodiment, the pressing frame is provided with a buckling hole, the bottom plate is provided with a buckling block, and the buckling block is buckled in the buckling hole.

In one embodiment, a heat conducting glue layer is arranged on the second surface of the lamp panel, the first surface of the heat conducting glue layer is connected with the second surface of the lamp panel, and the second surface of the heat conducting glue layer is connected with the bottom of the mounting groove.

In one embodiment, the bottom plate is provided with a heat sink, and the heat sink is provided with a plurality of heat sink grooves.

In one embodiment, the heat sink is provided with a heat sink.

The utility model also provides a display device comprising the backlight module in any one of the embodiments.

The beneficial effects of the utility model are as follows: according to the backlight module provided by the utility model, the plurality of lamp bead groups are arranged on the lamp panel, the brightness of each lamp bead group is regulated by matching with the IC chip according to the input signal, the regional regulation and control display can be realized, the first step is arranged on the inner frame, the second step is arranged on the first step, the width of the second step is smaller than that of the first step, the first step is embedded in the first limit groove of the diffusion plate, the second step is embedded in the second limit groove of the first optical diaphragm, the diffusion plate and the first optical diaphragm are respectively fixed in a graded dislocation mode, the situation that the diffusion plate loosens and jumps off can be avoided, the situation that the diffusion plate and the first optical diaphragm are dislocated due to mutual movement can be avoided, the diffusion plate has a uniform optical enhancement effect, the display effect of the backlight module is better, and the optical taste of the backlight module is improved.

Drawings

Fig. 1 is a schematic diagram of a three-dimensional exploded structure of a backlight module according to an embodiment;

FIG. 2 is a schematic diagram of a lamp panel;

FIG. 3 is a schematic view of a base plate, a lamp panel, an inner frame and a diffuser plate according to an embodiment;

FIG. 4 is a schematic diagram of an inner frame, a diffusion plate, a first optical film and a second optical film according to an embodiment;

FIG. 5 is a schematic view of the structure of a base plate and press frame according to one embodiment;

fig. 6 is a schematic structural diagram of a base plate, a heat sink and a heat sink according to an embodiment.

In the drawing, 10, a backlight module; 100. a bottom plate; 101. a mounting groove; 110. a buckling block; 200. a lamp panel; 210. a lamp bead group; 220. an IC chip; 300. an inner frame; 310. a first step; 320. a second step; 330. a third step; 340. a limit column; 400. a diffusion plate; 410. a first limit groove; 420. the first limit groove; 500. a first optical film; 510. the second limit groove; 520. the second limit groove; 600. a second optical film; 610. a third limit groove; 620. the third limit groove; 710. a third optical film; 720. a fourth optical film; 800. pressing a frame; 810. a buckling hole; 900. a heat conducting adhesive layer; 910. a heat sink; 911. a heat sink; 920. a heat sink.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The technical solution of the present utility model will be further described below with reference to the accompanying drawings of the embodiments of the present utility model, and the present utility model is not limited to the following specific embodiments.

It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present utility model, it should be understood that, if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., that indicate an azimuth or a positional relationship based on the directions or the positional relationships shown in the drawings, it is only for convenience of describing the present utility model and simplifying the description, but not for indicating or suggesting that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limitations of the present patent, and that the specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.

In one embodiment, as shown in fig. 1, 2, 3 and 4, a backlight module 10 includes: the light source comprises a base plate 100, a lamp panel 200, an inner frame 300, a diffusion plate 400, a first optical film 500 and a pressing frame 800; the base plate 100 is provided with a mounting groove 101, the lamp panel 200 is arranged in the mounting groove 101, a plurality of lamp bead groups 210 are arranged on a first surface of the lamp panel 200, an IC chip 220 is arranged on a second surface of the lamp panel 200, and the IC chip 220 is electrically connected with each lamp bead group 210; the first surface of the inner frame 300 is connected with the first surface of the lamp panel 200, the second surface of the inner frame 300 is provided with a first step 310, the first step 310 is provided with a second step 320, the width of the second step 320 is smaller than that of the first step 310, the diffusion plate 400 is provided with a first limit groove 410, the first surface of the diffusion plate 400 is connected with the second surface of the inner frame 300, the first step 310 is embedded in the first limit groove 410, the first optical film 500 is provided with a second limit groove 510, the first surface of the first optical film 500 is connected with the second surface of the diffusion plate 400, the first surface of the first optical film 500 is connected with the first step 310, and the second step 320 is embedded in the second limit groove 510; the pressing frame 800 is movably connected with the side wall of the bottom plate 100, and the pressing frame 800 is movably abutted against the second surface of the first optical film 500.

In this embodiment, the second surface of the lamp panel 200 is connected to the bottom side wall of the mounting groove 101, the lamp bead groups 210 are uniformly distributed on the first surface of the lamp panel 200, each lamp bead group 210 includes a plurality of lamp beads, the lamp beads are MiniLED (light emitting diode) lamp beads, the distance between the centers of two adjacent MiniLED lamp beads is 4.6 millimeters in one direction, the distance between the centers of two adjacent MiniLED lamp beads is 5.05 millimeters in the other direction, the number of the IC chips 220 can be multiple, the IC chips 220 can adjust the brightness of each lamp bead group 210 according to the input signal, so that the area-controlled display of the backlight module 10 is realized, and the brightness of the MiniLED lamp beads can be adjusted by adjusting the duty ratio, so that the higher contrast display effect is realized. It should be understood that, the adjustment of the brightness of each bead group 210 by the IC chip 220 according to the input signal is a technology known to those skilled in the art, and can be implemented, and in this embodiment, a detailed description is omitted.

In this embodiment, the first surface of the first step 310 is connected with the second surface of the inner frame 300, the first surface of the second step 320 is connected with the second surface of the first step 310, the height of the first step 310 on the inner frame 300 is matched with the thickness of the diffusion plate 400, when the first surface of the diffusion plate 400 is connected with the inner frame 300, the second surface of the diffusion plate 400 is flush with the second surface of the first step 310, the height of the second step 320 on the first step 310 is matched with the thickness of the first optical film 500, when the first optical film 500 is attached to the second surface of the diffusion plate 400, the second surface of the first optical film 500 is flush with the second surface of the second step 320, the first step 310 is arranged on the inner frame 300, the second step 320 is arranged on the first step 310, the width of the second step 320 is smaller than the width of the first step 310, the first step 310 is embedded in the first limit groove 410 of the first step 400, the second step 320 is embedded in the second limit groove 510 of the first optical film 500, the first step 400 is staggered, the first optical film 400 and the first optical film 500 is fixed on the second limit groove 510 respectively, the first optical film 500 is prevented from moving, the diffusion plate 500 is prevented from moving evenly, and the optical film 500 is prevented from moving evenly.

In one embodiment, as shown in fig. 4, the first end of the first step 310 is aligned with the first end of the second step 320, and the length from the first end to the second end of the first step 310 is greater than the length from the first end to the second end of the second step 320, so that the diffusion plate 400 and the first optical film 500 can be respectively fixed in a step-by-step dislocation manner, the situation that the diffusion plate 400 is loose and is tripped can be avoided, the situation that dislocation occurs when the diffusion plate 400 and the first optical film 500 move relative to each other can be avoided, and the diffusion plate 400 has a uniform optical enhancement effect.

In one embodiment, the first side of the first step 310 is aligned with the first side of the second step 320, and the length from the first side to the second side of the first step 310 is greater than the length from the first side to the second side of the second step 320, so that the diffusion plate 400 and the first optical film 500 can be respectively fixed in a graded dislocation manner, the situation that the diffusion plate 400 is loose and is tripped can be avoided, the situation that dislocation occurs when the diffusion plate 400 and the first optical film 500 move relative to each other can be avoided, and the diffusion plate 400 has a uniform optical enhancement effect.

In one embodiment, as shown in fig. 4, the backlight module 10 further includes: the second optical film 600, the second step 320 is provided with a third step 330, the width of the third step 330 is smaller than the width of the second step 320, the second optical film 600 is provided with a third limiting groove 610, a first surface of the second optical film 600 is connected with a second surface of the first optical film 500, a first surface of the second optical film 600 is connected with the second step 320, and the third step 330 is embedded in the third limiting groove 610. Specifically, the first surface of the third step 330 is connected to the second surface of the second step 320, the height of the third step 330 on the second step 320 is adapted to the thickness of the second optical film 600, when the second optical film 600 is attached to the second surface of the first optical film 500, the second surface of the second optical film 600 is flush with the second surface of the third step 330, the first end of the first step 310, the first end of the second step 320 and the first end of the third step 330 are aligned, the length from the first end to the second end of the first step 310 is greater than the length from the first end to the second end of the second step 320, the length from the first end to the second end of the second step 320 is greater than the length from the first end to the second end of the third step 330, or the first side of the first step 310, the first side of the second step 320 and the first side of the third step 330 are aligned, the length from the first side to the second side of the first step 310 is greater than the length from the first side to the second side of the second step 320, and the length from the first side to the second side of the second step 320 is greater than the length from the first side to the second side of the third step 330, so that the diffusion plate 400 and the first optical film 500 can be respectively fixed in a step-by-step dislocation manner, the situation that the diffusion plate 400 is loose and jumped off can be avoided, the situation that dislocation occurs when the diffusion plate 400 and the first optical film 500 are mutually moved can be avoided, and the diffusion plate 400 has a uniform optical enhancement effect.

In one embodiment, as shown in fig. 4, a limiting post 340 is disposed on the second surface of the inner frame 300, a first limiting groove 420 is formed on the diffusion plate 400, and the limiting post 340 is disposed in the first limiting groove 420. Specifically, the number of the limiting columns 340 is set to be multiple, the number of the first limiting grooves 420 is equal to the number of the limiting columns 340, each limiting column 340 is distributed on one side of the second face of the inner frame 300, the limiting columns 340 are embedded in the first limiting grooves 420, the diffusion plate 400 can be fixed in the X-axis direction and the Y-axis direction, and the situation of loosening and tripping can be better avoided.

In one embodiment, as shown in fig. 4, a second limiting groove 520 is formed on the first optical film 500, and the limiting post 340 is disposed in the second limiting groove 520. Specifically, the number of the second limiting grooves 520 is equal to the number of the limiting columns 340, and the first optical film 500 can be fixed in the directions of the X axis and the Y axis by embedding the limiting columns 340 in the second limiting grooves 520, so that the loose and trip situation can be better avoided.

In one embodiment, as shown in fig. 4, a third limiting groove 620 is formed on the second optical film 600, and the limiting post 340 is disposed in the third limiting groove 620. Specifically, the number of the third limiting grooves 620 is equal to the number of the limiting columns 340, and the second optical film 600 can be fixed in the X-axis and Y-axis directions by embedding the limiting columns 340 in the third limiting grooves 620, so that the loose and trip situation can be better avoided.

In one embodiment, as shown in fig. 1, the backlight module 10 further includes: the first surface of the third optical film 710 is connected with the second surface of the second optical film 600, a fourth limiting groove is formed in the third optical film 710, and the limiting post 340 is disposed in the fourth limiting groove, so that the third optical film 710 can be fixed in the X-axis and Y-axis directions.

In one embodiment, as shown in fig. 1, the backlight module 10 further includes: the fourth optical film 720, the first surface of the fourth optical film 720 is connected with the second surface of the third optical film 710, a fifth limiting groove is formed in the fourth optical film 720, and the limiting post 340 is disposed in the fifth limiting groove and can fix the fourth optical film 720 in the X-axis and Y-axis directions.

In one embodiment, the first optical film 500 is a light-diffusing film, and can diffuse and spread the light scattering conducted from the diffusion plate 400, and by enlarging the diffusion angle, the problem of uneven brightness can be overcome, and uniform surface light source light emission is achieved, the second optical film 600 is a lower brightness enhancement film, the third optical film 710 is an upper brightness enhancement film, and can gather the scattered light conducted by the light-diffusing film in the front direction, so that the light source can be further homogenized and corrected, and the brightness is improved, and the fourth optical film 720 is a peep-proof film, which can make the data displayed by the screen dedicated to the user for reading in front, and any person can only see the black-in-paint picture on both sides. It should be noted that the first optical film 500, the second optical film 600, the third optical film 710 and the fourth optical film 720 may be selected according to the optical enhancement effect or the optical performance required by the diffusion plate 400, and are not limited in this embodiment.

In one embodiment, as shown in fig. 5, the pressing frame 800 is provided with a fastening hole 810, the base plate 100 is provided with a fastening block 110, and the fastening block 110 is fastened in the fastening hole 810. Specifically, the press frame 800 is a frame-shaped structure with a window in the middle, the number of the buckling blocks 110 is set to be multiple, the number of the buckling holes 810 is equal to the number of the buckling blocks 110, the buckling blocks 110 are uniformly distributed on the outer side surface of the base plate 100, the buckling blocks 110 are embedded in the buckling holes 810, the movable connection of the press frame 800 and the base plate 100 is realized, the movement of the press frame 800 in the three-axis direction can be limited, the press frame 800 can be limited and fixed, the shaking of the press frame 800 on the base plate 100 and the outward-scraping deformation of the press frame 800 are avoided, the diffusion plate 400 and the first optical film 500 and the second optical film 600 on the diffusion plate 400 can be well fixed, and the backlight module 10 has a good display effect.

In one embodiment, as shown in fig. 1, a heat-conducting glue layer 900 is disposed on the second surface of the lamp panel 200, the first surface of the heat-conducting glue layer 900 is connected to the second surface of the lamp panel 200, and the second surface of the heat-conducting glue layer 900 is connected to the bottom of the mounting groove 101. Specifically, the heat-conducting glue forming the heat-conducting glue layer 900 is an organosilicon bonding sealant, has good bonding property, and also has excellent corona resistance, electric leakage resistance and chemical medium resistance, and the heat-conducting glue layer 900 not only can fix the lamp panel 200 in the mounting groove 101, but also can timely conduct heat generated during the operation of the lamp panel 200 to the external environment, thereby improving the reliability of the lamp panel 200 during the normal operation.

In one embodiment, as shown in fig. 6, the bottom plate 100 is provided with a heat sink 910, and the heat sink 910 is provided with a plurality of heat sink grooves 911. Specifically, the heat sink 910 may be a heat dissipation aluminum sheet, the first surface of the bottom plate 100 is provided with the mounting groove 101, the first surface of the heat sink 910 is connected with the second surface of the bottom plate 100, and the second surface of the heat sink 910 is provided with the plurality of heat dissipation grooves 911, so that heat generated during operation of the lamp panel 200 can be well conducted to an external environment through the heat sink 910, the effect of protecting the lamp panel 200 can be achieved, and the operation stability of the lamp panel 200 can be improved.

In one embodiment, as shown in fig. 6, the heat sink 910 is provided with a heat sink 920. Specifically, the heat sink 920 may be a heat dissipating fan, and the heat sink 920 is fixed on the heat dissipating fins 910 by a threaded connection manner, so that the number of the heat sinks 920 may be two or more, and the temperature of the backlight module 10 during operation can be further reduced, and the heat dissipating performance is better, thereby increasing the service life of the backlight module 10.

In one embodiment, a display device is provided, which includes the backlight module 10 described in any of the above embodiments. In this embodiment, the display device is a liquid crystal panel, the display device further includes a circuit board, a liquid crystal display screen and an outer frame, the backlight module 10 is disposed on the circuit board, and is installed and fixed on the circuit board through an installation pin and a fixing pin, the liquid crystal display screen is fixed on the backlight module 10, and the outer frame is enclosed on the outer side of the backlight module 10, which needs to be understood that the light emitting display device may further include other elements, which are not described in detail herein.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A backlight module, comprising: the device comprises a bottom plate, a lamp panel, an inner frame, a diffusion plate, a first optical film and a pressing frame;

2. A backlight module according to claim 1, further comprising: the second optical film is provided with a third step, the width of the third step is smaller than that of the second step, a third limit groove is formed in the second optical film, the first face of the second optical film is connected with the second face of the first optical film, the first face of the second optical film is connected with the second step, and the third step is embedded in the third limit groove.

3. The backlight module according to claim 2, wherein a limiting post is disposed on the second surface of the inner frame, a first limiting groove is disposed on the diffusion plate, and the limiting post is disposed in the first limiting groove.

4. A backlight module according to claim 3, wherein the first optical film is provided with a second limit groove, and the limit post is disposed in the second limit groove.

5. The backlight module according to claim 4, wherein a third limiting groove is formed in the second optical film, and the limiting post is disposed in the third limiting groove.

6. The backlight module according to claim 1, wherein the pressing frame is provided with a buckling hole, the bottom plate is provided with a buckling block, and the buckling block is buckled in the buckling hole.

7. The backlight module according to claim 1, wherein a heat conducting glue layer is arranged on the second surface of the lamp panel, the first surface of the heat conducting glue layer is connected with the second surface of the lamp panel, and the second surface of the heat conducting glue layer is connected with the bottom of the mounting groove.

8. A backlight module according to claim 7, wherein the bottom plate is provided with a heat sink, and the heat sink is provided with a plurality of heat sink grooves.

9. A backlight module according to claim 8, wherein the heat sink is provided with a heat sink.

10. A display device comprising a backlight module according to any one of claims 1-9.