CN216248706U

CN216248706U - Backlight module and display device

Info

Publication number: CN216248706U
Application number: CN202123000957.0U
Authority: CN
Inventors: 邹英华; 万耿; 段秋艳
Original assignee: Tcl Huarui Lighting Technology Huizhou Co ltd; Very Optoelectronics Huizhou Co Ltd
Current assignee: Tcl Huarui Lighting Technology Huizhou Co ltd; Very Optoelectronics Huizhou Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-04-08
Anticipated expiration: 2031-11-30

Abstract

The utility model relates to a backlight module and a display device, the backlight module comprises: the LED lamp comprises a plurality of light-emitting units and a light guide plate, wherein each light-emitting unit comprises a circuit board and a plurality of LED lamp beads, each LED lamp bead is arranged on the circuit board, the light-emitting direction of each LED lamp bead is parallel to the circuit board, the light guide plate is arranged on one surface, close to the LED lamp beads, of the circuit board, and the light guide plate is provided with a plurality of avoiding grooves. Through setting up a plurality of luminescence units and light guide plate, can each luminescence unit carry out circuit control respectively, through setting up the luminous direction with each LED lamp pearl to be parallel to each other with the circuit board, realize that the side is luminous, the light that LED lamp pearl sent can directly be derived through the light guide plate, avoid folding the light guide plate and locate the luminescence unit top, the backlight unit who obtains is frivolous, it is luminous even, the illuminating effect is good, each luminescence unit can be regulated and control, can realize local accuse light, be convenient for follow-up preparation obtains the display device that the display effect is better.

Description

Backlight module and display device

Technical Field

The utility model relates to the technical field of display devices, in particular to a backlight module and a display device.

Background

Backlight unit is one of display device's key part, backlight unit is used for providing the light source that has sufficient luminance and distribution uniformity, make display device can normally show the image, be an indispensable part of display device, backlight unit is including side income formula backlight unit and straight following formula backlight unit, concretely, side income formula backlight unit is the backlight unit who arranges the lamp pearl around concrete electronic product, usually set up the lamp pearl in the both sides or the bottom of concrete electronic product, straight following formula backlight unit is arranged the lamp pearl at the back of concrete electronic product, straight following formula backlight unit's luminous even, but the cost is also higher.

However, the existing direct type backlight module has the advantage of more uniform light emission, which is beneficial to improving the quality of the electronic product obtained by preparation, but because the light source and the light guide plate are stacked one on another, the thickness of the whole product structure obtained by preparation is increased, the development trend of light and thin electronic products is not met, and the higher consumption requirements of people cannot be met, so that the backlight module and the display device which are light, thin and good in light emitting effect need to be provided.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a backlight module and a display device.

The technical scheme for solving the technical problems is as follows: a backlight module includes:

the LED lamp comprises a plurality of light-emitting units, a plurality of LED lamp beads and a plurality of LED lamp beads, wherein the light-emitting units are arranged adjacently, each light-emitting unit comprises a circuit board and a plurality of LED lamp beads, each LED lamp bead is arranged on the circuit board, and the light-emitting direction of each LED lamp bead is parallel to the circuit board; and

the light guide plate, the light guide plate set up in each the circuit board is close to on the one side of LED lamp pearl, the light guide plate has been seted up a plurality of grooves of dodging, each the groove of dodging is used for holding each LED lamp pearl.

In one embodiment, the thickness of the light guide plate is greater than the height of each LED lamp bead.

In one embodiment, each of the LED lamp beads is a side-emitting LED lamp bead.

In one embodiment, each of the LED lamp beads is distributed in a circular shape.

In one embodiment, each LED lamp bead is distributed in a rectangular shape.

In one embodiment, the LED lamp beads include a first LED lamp bead, a second LED lamp bead, a third LED lamp bead and a fourth LED lamp bead, the first LED lamp bead, the second LED lamp bead, the third LED lamp bead and the fourth LED lamp bead are distributed in a rectangular shape in sequence, a light emitting direction of the first LED lamp bead is parallel to a light emitting direction of the third LED lamp bead, the first LED lamp bead is distributed in a staggered manner with the third LED lamp bead, the light emitting direction of the second LED lamp bead is parallel to a light emitting direction of the fourth LED lamp bead, and the second LED lamp bead is distributed in a staggered manner with the fourth LED lamp bead.

In one embodiment, each of the light emitting units is distributed in a matrix.

In one embodiment, a plurality of grooves are formed in a surface of the circuit board facing the light guide plate, and a plurality of protrusions are formed on a surface of the light guide plate facing the circuit board, and each protrusion is disposed in one of the grooves.

In one embodiment, the light guide plate is a PMMA light guide plate or a PC light guide plate.

A display device, comprising: the backlight module described in any of the above embodiments.

Compared with the prior art, the utility model has at least the following advantages:

the utility model can realize the regulation and control of each light-emitting unit by arranging a plurality of light-emitting units and a light guide plate, and each light-emitting unit and the light guide plate correspondingly form a complete backlight module, and each light-emitting unit can be respectively controlled by circuits, specifically, each light-emitting unit comprises a circuit board and a plurality of LED lamp beads, the side surface light emitting can be realized by arranging the light-emitting direction of each LED lamp bead to be parallel to the circuit board, and then the light guide plate is attached on the circuit board, because the light guide plate is provided with a avoiding groove for avoiding each LED lamp bead, and the light guide plate is arranged to be parallel to the circuit board, the light emitted by the LED lamp beads can be directly LED out through the light guide plate, thus, the light guide plate can be prevented from being overlapped above the light-emitting units, the thickness of the prepared backlight module is favorably reduced, the obtained backlight module is light and thin, the light-emitting is uniform, and the light-emitting effect is good, each light-emitting unit can be regulated and controlled, local light control can be realized, and subsequent preparation is facilitated to obtain the display device with better display effect.

Drawings

FIG. 1 is a schematic structural diagram of a backlight module according to an embodiment;

FIG. 2 is a schematic view of a partial structure of a backlight module according to an embodiment;

FIG. 3 is a schematic view of a partial structure of a backlight module according to an embodiment;

fig. 4 is a schematic structural view of a light emitting unit and a light guide plate of a backlight module according to an embodiment.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The technical solutions of the present invention will be further described below with reference to the accompanying drawings of the embodiments of the present invention, and the present invention 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 parts. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the patent, and the specific meanings of the terms will be understood by those skilled in the art according to specific situations.

Referring to fig. 1, 2 and 4, in one embodiment, a backlight module 10 is provided, which includes a plurality of light emitting units 100 and a light guide plate 200. Each of the light emitting units 100 is disposed adjacent to each other, in each of the light emitting units 100, the light emitting unit 100 includes a circuit board 110 and a plurality of LED beads 120, each of the LED beads 120 is disposed on the circuit board 110, and a light emitting direction of each of the LED beads 120 is parallel to the circuit board 110. The light guide plate 200 is disposed on one surface of each of the circuit boards 110, which is close to the LED lamp beads 120, the light guide plate 200 is provided with a plurality of avoiding grooves 201, and each of the avoiding grooves 201 is used for accommodating each of the LED lamp beads 120.

It should be noted that, each light emitting unit 100 is used for emitting light, and is electrically connected to an external power supply device through the outside to supply power to each light emitting unit 100, so as to realize light emission, the light guide plate 200 may be provided as one or more, specifically, when the light guide plate 200 is provided as one, the light guide plate 200 is adapted to the shape of each light emitting unit 100 after being arranged and combined, when the light guide plate 200 is provided as a plurality, the number of the light guide plates 200 may be adapted to the number of the light emitting units 100 and the shape is adapted, in this embodiment, the light guide plate 200 is provided as a plurality, and the light guide plate 200 is adapted to the number and the shape of each light emitting unit 100, each light guide plate 200 is respectively provided corresponding to each light emitting unit 100, so as to guide the light emitted by each light emitting unit 100, so that the light emission is uniform, by providing a plurality of light emitting units 100 and a plurality of light guide plates 200, each light emitting unit 100 and each light guide plate 200 form a complete backlight module, each light-emitting unit 100 can be respectively controlled by a circuit, each light-emitting unit 100 can be regulated and controlled, and specifically, in one light-emitting unit 100, the light-emitting unit comprises a circuit board 110 and a plurality of LED lamp beads 120, the circuit board 110 is provided with a plurality of bonding pads, each LED lamp bead 120 can be welded on each bonding pad through tin paste, so that circuit communication with the circuit board 110 is realized, the light-emitting surface of each LED lamp bead 120 is arranged perpendicular to the circuit board 110, so that the light-emitting direction of each LED lamp bead 120 is parallel to the circuit board 110, side light emitting can be realized, then, the light guide plate 200 is attached to the circuit board 110, the light guide plate 200 is provided with a plurality of avoiding grooves 201, each avoiding groove 201 is matched with the shape and the position of each LED lamp bead 120, so as to avoid each LED lamp bead 120, the light guide plate 200 is attached to the circuit board 110, the light guide plate 200 is arranged parallel to the circuit board 110, and light emitted by the LED lamp beads 120 can be directly guided out through the light guide plate 200, therefore, uniform light emission is realized, so that the light guide plate 200 can be prevented from being stacked above the light emitting units 100, the thickness of the prepared backlight module is favorably greatly reduced, the obtained backlight module is light and thin, uniform light emission and good light emitting effect are realized, each light emitting unit 100 can be regulated and controlled, local light control can be realized, and the subsequent preparation is facilitated to obtain the display device with better display effect.

Referring to fig. 4, in an embodiment, the thickness of the light guide plate 200 is greater than the height of each LED lamp bead 120. It can be understood that, because LED lamp pearl 120 has certain luminous angle, set up to the height that is greater than LED lamp pearl 120 through the thickness with light guide plate 200, can be so that the terminal surface of light guide plate 200 is higher than LED lamp pearl 120's terminal surface, thereby make light guide plate 200's terminal surface be higher than LED lamp pearl 120's light emitting area, be favorable to guaranteeing that the light that LED lamp pearl 120 sent can derive through light guide plate 200, thereby realize evenly giving out light, avoid appearing the light leak phenomenon, be favorable to improving luminous efficiency, luminous effect is better.

In order to avoid the light leakage phenomenon and avoid the backlight module from being too thick, and to ensure the backlight module to be thin and light, in one embodiment, the thickness of the light guide plate 200 is calculated as follows:

0.05×(0.5×m-0.5×n)+m≤Q≤0.2×(0.5×m-0.5×n)+m

wherein, Q is defined as the thickness of the light guide plate 200, m is defined as the height of the LED lamp bead 120, and n is defined as the width of the light emitting surface of the LED lamp bead 120. It can be understood that, since the LED lamp beads 120 have a certain light emitting angle, in order to ensure that the light leakage phenomenon is avoided, the thickness of the light guide plate 200 needs to be precisely controlled so as to be adapted to the specific LED lamp beads 120 of different models, so that the thickness of the prepared backlight module is proper, the light leakage phenomenon is avoided, and the light emitting effect is ensured, specifically, since the model size of the LED lamp beads 120 is known, the height of the LED lamp beads 120 and the width of the light emitting surface of the LED lamp beads 120 can be obtained, the edge width of the non-light emitting surface part of the LED lamp beads 120 can be calculated by 0.5 xm-0.5 xn, the edge width of the non-light emitting surface part of the LED lamp beads 120 can be calculated by 0.05 times to 0.2 times the thickness of the light guide plate 200 based on the height of the LED lamp beads 120 itself, the thickness of the light guide plate 200 can be precisely calculated and designed, so that the thickness of the light guide plate 200 is proper, when avoiding the light leak, can avoid light guide plate 200 thickness too thick, guarantee the frivolousness of the backlight unit that the preparation obtained, so, can be according to specific LED lamp pearl 120 models, calculate the thickness that obtains light guide plate 200 fast, can carry out accurate calculation to the thickness of light guide plate 200 to the light guide plate 200 model size of being convenient for quick design collocation guarantees luminous effect, improves production efficiency, is applicable to industrial production.

In one embodiment, each of the LED beads 120 is a side-emitting LED bead. It can be understood that each LED lamp bead 120 is a side-emitting LED lamp bead, which is the LED lamp bead 120 with positive and negative pads on the side wall, specifically, the positive and negative pads at the bottom of the side-emitting LED lamp bead extend to the side wall of the lamp bead, the positive and negative pads on the side wall of the side-emitting LED lamp bead are perpendicular to the side wall of the side-emitting LED lamp bead, so that, the side-emitting LED lamp beads can be welded on the circuit board 110 through the positive and negative electrode pads on the side walls of the side-emitting LED lamp beads 120, so that the side walls of the side-emitting LED lamp beads are parallel to the circuit board, thereby realize LED lamp pearl 120's light emitting area and circuit board 110 mutually perpendicular to realize that the light that LED lamp pearl 120 sent is parallel with the circuit board, realize that the side is luminous, LED lamp pearl 120 adopts the luminous LED lamp pearl of side, is convenient for install LED lamp pearl 120 on circuit board 110, is favorable to reducing the production degree of difficulty, realizes industrial production, improves the productivity effect.

Referring to fig. 1, fig. 2 and fig. 4, in order to improve the structural compactness of the backlight module and facilitate installation, in an embodiment, the light guide plate 200 is adapted to the shape of the circuit board 110, each LED lamp bead 120 is disposed at the edge of the circuit board 110, and each avoiding groove 201 has an opening 201 a. It can be understood that the light guide plate 200 is adapted to the circuit board 110, that is, the peripheral end surfaces of the light guide plate 200 are flush with the peripheral end surfaces of the circuit board 110, and each avoiding groove 201 is correspondingly formed at the edge of the light guide plate 200 by disposing each LED lamp bead 120 at the edge of the circuit board 110, so that the avoiding groove 201 can be set to a concave shape, the light emitting direction of each LED lamp bead 120 is toward the bottom of the avoiding groove 201, and the avoiding groove 201 has an opening 201a, so that the heat generated by the LED lamp beads 120 when emitting light can be rapidly conducted out to the external environment through the opening 201a, which is beneficial for improving the heat dissipation performance of the backlight module, that is, each LED lamp bead 120 is disposed at the peripheral edge of the circuit board 110, each avoiding groove 201 is correspondingly disposed at the peripheral edge of the light guide plate 200, and the light emitting direction of each LED lamp bead 120 is toward the middle of the light guide plate 200, so, the light that each LED lamp pearl 120 sent can be derived from light guide plate 200 through the reflection of light guide plate 200, realizes the light-emitting unit 100 light-emitting, and luminous effect is even, and is difficult for generating heat, and the radiating effect is good.

In order to improve the light emitting uniformity of the backlight module, in one embodiment, each of the LED beads 120 is distributed in a circular shape. As can be understood, each LED lamp pearl 120 is circular form and distributes, and the luminous direction of each LED lamp pearl 120 is towards the centre of a circle department of circular form, so, can send the light of even all directions around circular form, and rethread light guide plate 200 derives, and luminous more even, and luminous effect is better.

In order to improve the light emitting uniformity of the backlight module, in one embodiment, each of the LED beads 120 is distributed in a rectangular shape. Similarly, through setting up each LED lamp pearl 120 to be the rectangle form and distribute, and the luminous direction of each LED lamp pearl 120 is towards the central axis department of rectangle form, so, can follow four directions of rectangle form and send even light, deriving through light guide plate 200, luminous more even, luminous effect is better.

Referring to fig. 2 and fig. 3, in an embodiment, the LED lamp bead 120 includes a first LED lamp bead 121, a second LED lamp bead 122, a third LED lamp bead 123 and a fourth LED lamp bead 124, the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 are sequentially distributed in a rectangular shape, a light emitting direction of the first LED lamp bead 121 is parallel to a light emitting direction of the third LED lamp bead 123, the first LED lamp bead 121 and the third LED lamp bead 123 are distributed in a staggered manner, a light emitting direction of the second LED lamp bead 122 is parallel to a light emitting direction of the fourth LED lamp bead 124, and the second LED lamp bead 122 and the fourth LED lamp bead 124 are distributed in a staggered manner. It can be understood that, in this embodiment, the circuit board 110 and the light guide plate 200 are both rectangular, and the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 are sequentially disposed at adjacent four edges of one side of the circuit board 110, such that the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 are rectangular, that is, the first LED lamp bead 121 and the third LED lamp bead 123 are disposed opposite to each other, and the second LED lamp bead 122 and the fourth LED lamp bead 124 are disposed opposite to each other, so that the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 can emit uniform light from four directions of the circuit board 110, and emit uniform light with good effect, further, in this embodiment, the first LED lamp bead 121 and the third LED lamp bead 123 are disposed in a staggered manner, and the second LED lamp bead 122 and the fourth LED lamp bead 124 are disposed in a staggered manner, on one hand, the light emitted by the first LED lamp bead 121 and the light emitted by the third LED lamp bead 123 can be prevented from mutually irradiating and overlapping, so that the light emitted by the first LED lamp bead 121 and the third LED lamp bead 123 is distributed in a staggered manner, thereby being beneficial to improving the light-emitting efficiency and improving the brightness of the prepared backlight module, on the other hand, because the light-emitting units 100 are adjacently arranged, when the light-emitting units 100 are arranged, the first LED lamp bead 121 and the third LED lamp bead 123 on the adjacent light-emitting units 100 can be distributed in a staggered manner, and similarly, the second LED lamp bead 122 and the fourth LED lamp bead 124 on the adjacent light-emitting units 100 can be distributed in a staggered manner, so that the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 can generate more heat when emitting light, so that the surrounding temperature is higher, and the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED bead 124 are all distributed in a staggered manner, the superposition phenomenon can be avoided, the local overheating phenomenon is avoided, namely, when the uniform light-emitting effect is ensured, the heat radiation performance of the backlight module can be greatly improved, the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 can be well protected, the service life of the first LED lamp bead 121, the second LED lamp bead 122, the third LED lamp bead 123 and the fourth LED lamp bead 124 is favorably prolonged, and the service life of the backlight module is prolonged.

Referring to fig. 1, in an embodiment, each of the light emitting cells 100 is distributed in a matrix. It can be understood that each of the light emitting units 100 is distributed in a matrix shape, and the arrangement is neat and regular, so that the installation is convenient, and the structural stability of the prepared backlight module is improved.

In one embodiment, a plurality of grooves are disposed on a surface of the circuit board 110 facing the light guide plate 200, and a plurality of protrusions are disposed on a surface of the light guide plate 200 facing the circuit board 110, each of the protrusions being disposed in one of the grooves. It can be understood, through being provided with a plurality of bulges, the shape and the position looks adaptation of each bulge and each recess, thereby can be through bulge and recess one-to-one block, thereby realize that circuit board 110 is connected with light guide plate 200's block, can fix a position the installation, prevent that light guide plate 200 from appearing the aversion phenomenon, thereby prevent light guide plate 200 and each LED lamp pearl 120 bump, thereby prevent that light guide plate 200 from causing the damage to each LED lamp pearl 120, be favorable to improving this backlight unit's life.

In one embodiment, the protruding part is plum blossom-shaped, the cross section of the groove is plum blossom-shaped, and the groove is matched with the protruding part. It can be understood, through setting up the bulge into the plum blossom form, thereby make the bulge set up to slick and sly petal column structure, correspondingly, the recess also sets up to plum blossom column structure, thus, when bulge and recess block, slick and sly petal structure can play the cushioning effect, avoid light guide plate 200 and circuit board 110 hard contact, thereby when guaranteeing that light guide plate 200 and circuit board 110 block better together, can also prevent that light guide plate 200 and circuit board 110 from damaging, play the guard action to light guide plate 200 and circuit board 110, be favorable to improving this backlight unit's life, and simultaneously, the bulge sets up to the plum blossom form, be favorable to increasing the lateral wall surface area of bulge, thereby be favorable to increasing the area of contact of bulge and recess, the block effect is better.

In one embodiment, the light guide plate 200 is a PMMA (polymethyl methacrylate) light guide plate or a PC (Polycarbonate) light guide plate. It can be understood that the PMMA light guide plate or the PC light guide plate is the commonly used light guide plate 200, and has the characteristics of high transparency and good light guide effect, and the mechanical property is good, the strength is high, thereby being beneficial to ensuring the structural stability of the prepared backlight module, and improving the service life of the backlight module.

In one embodiment, there is also provided a display device including: the backlight module 10 described in any of the above embodiments.

The display device further comprises a liquid crystal screen and a power supply device, wherein the power supply device is electrically connected with the circuit board and used for providing electric energy for the light emitting of each LED lamp bead, and the light emitted by the backlight module is projected onto the liquid crystal screen, so that the normal display function of the display device is realized.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A backlight module, comprising:

2. The backlight module as claimed in claim 1, wherein the light guide plate has a thickness greater than a height of each of the LED beads.

3. The backlight module as claimed in claim 1, wherein each of the LED beads is a side-emitting LED bead.

4. The backlight module as claimed in claim 1, wherein each of the LED beads is distributed in a circular shape.

5. The backlight module as claimed in claim 1, wherein each of the LED beads is rectangular.

6. The backlight module of claim 5, wherein the LED lamp beads comprise a first LED lamp bead, a second LED lamp bead, a third LED lamp bead and a fourth LED lamp bead, the first LED lamp bead, the second LED lamp bead, the third LED lamp bead and the fourth LED lamp bead are distributed in a rectangular shape in sequence, the light emitting direction of the first LED lamp bead is parallel to the light emitting direction of the third LED lamp bead, the first LED lamp bead and the third LED lamp bead are distributed in a staggered manner, the light emitting direction of the second LED lamp bead is parallel to the light emitting direction of the fourth LED lamp bead, and the second LED lamp bead and the fourth LED lamp bead are distributed in a staggered manner.

7. The backlight module as claimed in claim 1, wherein each of the light emitting units is distributed in a matrix.

8. The backlight module as claimed in claim 1, wherein a plurality of grooves are formed on a surface of the circuit board facing the light guide plate, and a plurality of protrusions are formed on a surface of the light guide plate facing the circuit board, each of the protrusions being disposed in one of the grooves.

9. A backlight module according to any one of claims 1-8, wherein the light guide plate is a PMMA light guide plate or a PC light guide plate.

10. A display device, comprising: a backlight module as claimed in any one of claims 1 to 9.