CN117492263A - Backlight modules and display devices - Google Patents

Abstract

The application provides a backlight unit and display device, this backlight unit includes the backplate, a plurality of light emitting unit and a plurality of encapsulation unit, the backplate includes a plurality of recesses that the interval set up, the light emitting unit sets up on the backplate, encapsulation unit sets up in the one side that the backplate was kept away from to the light emitting unit, an encapsulation unit corresponds a light emitting unit setting, encapsulation unit includes encapsulation portion and joint portion, encapsulation position is located the one side that backplate was kept away from to joint portion, this application encircles a light emitting unit setting through setting up a recess, the recess includes barb structure, in an encapsulation unit and the light emitting unit that corresponds thereof, encapsulation portion covers the light emitting unit, joint portion and barb structure joint each other, thereby the cohesion of encapsulation unit and backplate has been strengthened, the problem that the current backlight unit is when doing high low temperature circulation reliability test, the likely phenomenon of coming into unstuck has been prolonged backlight unit's life, guarantee display device's luminance homogeneity.

Description

Backlight modules and display devices

Technical field

The present application relates to the field of display technology, and in particular, to a backlight module and a display device.

Background technique

In Mini-Light-Emitting Diode (Mini-LED) displays, a large number of densely distributed devices are usually used to achieve dimming in a smaller area. Therefore, good brightness uniformity can still be achieved under the premise of a small light mixing distance. The screen is brightly colored and has higher contrast. When paired with a high color gamut configuration, the effect is comparable to that of Organic Light-Emitting Diode (OLED). At the same time, because of the existence of a large number of dense light sources, it is easier to achieve than conventional LED displays. Higher brightness requirements.

At present, in view of the many advantages of Mini-LED display, it has obvious advantages in ultra-thin, high color rendering and power saving applications, and has attracted widespread attention from major manufacturers; in the existing Mini-LED In the application of backlight modules, the dispensing process is usually used to encapsulate the packaging glue on the LED lights. A large number of densely packed LED lights can improve the light efficiency, but it also brings problems such as high cost and difficulty in heat dissipation. Among them, due to the packaging glue For backlight modules, the difference in thermal expansion coefficients between the packaging glue, LED lights and light panels causes great shear stress on both sides of the packaging glue. During high and low temperature cycle reliability testing, degumming may occur, resulting in The light panel shows uneven abnormality.

Contents of the invention

Embodiments of the present application provide a backlight module and a display device to alleviate deficiencies in related technologies.

In order to realize the above functions, the technical solutions provided by the embodiments of this application are as follows:

An embodiment of the present application provides a backlight module, including:

The back plate includes a plurality of grooves arranged at intervals;

A plurality of light-emitting units arranged on the backplane;

A plurality of sealing units are disposed on the side of the light-emitting unit away from the backplane. One sealing unit is provided corresponding to one light-emitting unit. The sealing unit includes a sealing part and a clamping part. The sealing part is located on the side of the clamping part away from the back plate;

Wherein, a groove is arranged around a light-emitting unit, the groove includes a barb structure, and in a sealing unit and its corresponding light-emitting unit, the sealing part covers the light-emitting unit, The engaging portion and the barb structure are engaged with each other.

In the backlight module provided by the embodiment of the present application, the barb structure includes a first sub-groove and a second sub-groove that are connected to each other, and the second sub-groove is located away from the first sub-groove. One side of the sealing unit;

Wherein, the first sub-groove extends along a first direction, the second sub-groove extends along a second direction, and the first direction and the second direction form a preset angle.

In the backlight module provided by the embodiment of the present application, the preset angle is greater than or equal to 90 degrees and less than or equal to 150 degrees, wherein the second direction is parallel to the extension direction of the back plate.

In the backlight module provided by the embodiment of the present application, the first sub-groove has an inclined side wall, and the horizontal cross-sectional area of the first sub-groove close to the sealing unit is larger than the first sub-groove. The groove is away from the horizontal cross-sectional area of the sealing unit.

In the backlight module provided by the embodiment of the present application, the cross-section of the side wall of the first sub-groove in a direction perpendicular to the back plate is a straight line or an arc.

In the backlight module provided by the embodiment of the present application, the orthographic projection of the first sub-groove on the back plate is located within the orthographic projection of the second sub-groove on the back plate;

The second sub-groove includes a first groove part and a second groove part that are connected, and the extending direction of the first groove part is opposite to the extending direction of the second groove part.

In the backlight module provided by the embodiment of the present application, the width of the second sub-groove is greater than the width of the first sub-groove in a direction perpendicular to the back plate.

In the backlight module provided by the embodiment of the present application, the depth of the first sub-groove is greater than the depth of the second sub-groove.

In the backlight module provided by the embodiment of the present application, the shape of the groove is wedge-shaped.

An embodiment of the present application provides a display device, which includes a display panel and any of the above-mentioned backlight modules.

Beneficial effects of the embodiments of the present application: The embodiments of the present application provide a backlight module and a display device. The backlight module includes a backplane, a plurality of light-emitting units and a plurality of sealing units. The backplane includes a plurality of spaced apart Groove, the light-emitting unit is provided on the back plate, the sealing unit is provided on the side of the light-emitting unit away from the back plate, one sealing unit is provided corresponding to one light-emitting unit, so The sealing unit includes a sealing part and a clamping part. The sealing part is located on a side of the clamping part away from the back plate. In this embodiment, a groove is provided to surround a light-emitting unit. It is provided that the groove includes a barb structure, in one of the sealing units and the corresponding light-emitting unit, the sealing part covers the light-emitting unit, and the engaging part and the barb structure engage with each other. , thereby increasing the bonding force between the sealing unit and the backplane, solving the possible degumming phenomenon of the existing backlight module during high and low temperature cycle reliability testing, and extending the life of the backlight module. service life to ensure the brightness uniformity of the display device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed 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 application. For those skilled in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of an existing backlight module;

Figure 2 is an enlarged view of point A in Figure 1;

Figure 3 is a first top view of the backlight module provided by the embodiment of the present application.

Figure 4 is a second top view of the backlight module provided by the embodiment of the present application;

Figure 5 is a first structural schematic diagram of a backlight module provided by an embodiment of the present application;

Figure 6 is an enlarged view of B in Figure 5;

Figure 7 is a schematic structural diagram of a sealing unit provided by an embodiment of the present application;

Figure 8 is a second structural schematic diagram of the backlight module provided by the embodiment of the present application;

Figure 9 is an enlarged view of C in Figure 8;

FIG. 10 is a third structural schematic diagram of a backlight module provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of this application. In addition, it should be understood that the specific embodiments described here are only used to illustrate and explain the application, and are not used to limit the application. In this application, unless otherwise specified, the directional words used such as "upper" and "lower" usually refer to the upper and lower positions of the device in actual use or working conditions, specifically the direction of the drawing in the drawings. ; while “inside” and “outside” refer to the outline of the device.

Embodiments of the present application provide a backlight module and a display device. Each is explained in detail below. It should be noted that the order of description of the following embodiments does not limit the preferred order of the embodiments.

Please refer to FIGS. 3 to 10 . This embodiment provides a backlight module and a display device. The backlight module 2 includes a backplane 10 , a plurality of light-emitting units 20 and a plurality of sealing units 30 . The backplane 10 It includes a plurality of grooves 11 arranged at intervals, the light-emitting unit 20 is arranged on the back plate 10, and the sealing unit 30 is arranged on the side of the light-emitting unit 20 away from the back plate 10. The sealing unit 30 is provided corresponding to one of the light-emitting units 20 . The sealing unit 30 includes a sealing part 30A and a clamping part 30B. The sealing part 30A is located away from the clamping part 30B and away from the back plate 10 . One side; wherein, a groove 11 is arranged around a light-emitting unit 20, the groove 11 includes a barb structure 110, a sealing unit 30 and its corresponding light-emitting unit 20, the The sealing part 30A covers the light-emitting unit 20 , and the engaging part 30B and the barb structure 110 are engaged with each other.

It should be noted that one side wall of the groove 11 is bent toward the side close to the light-emitting unit 20 to form the barb structure 110 , and the barb structure 110 is bent toward the side away from the light-emitting unit 20 . arc or slope; it can be understood that the groove 11 includes a barb structure 110, so that the part of the sealing unit 30 located in the groove 11 forms a hook surface, and the hook surface increases the The bonding force between the sealing unit and the back plate.

Please refer to Figures 1 and 2; Figure 1 is a schematic structural diagram of an existing backlight module; Figure 2 is an enlarged view of A in Figure 1; the existing backlight module 1 includes a backplane 10, A plurality of light-emitting units 20 on the backplane 10 and an encapsulant 40 located on the side of the light-emitting unit 20 away from the backplane 10. The encapsulant 40 covers the light-emitting unit 20; it can be understood that in the existing In the backlight module 1, the packaging glue 40 is usually packaged on the light-emitting unit 20 using a glue dispensing process. Since the packaging glue 40 is attached to the backplane 10, the packaging glue 40, The difference in thermal expansion coefficient between the light-emitting unit 20 and the backplane 10 causes a large shear stress on both sides of the encapsulant 40 , and debonding may occur during high and low temperature cycle reliability testing.

It can be understood that in this embodiment, a groove is arranged around a light-emitting unit, and the groove includes a barb structure. In a sealing unit and its corresponding light-emitting unit, the sealing unit is The glue part covers the light-emitting unit, and the engaging part and the barb structure are engaged with each other, thereby increasing the bonding force between the sealing unit and the backplane and solving the problem of high performance of existing backlight modules. The degumming phenomenon that may occur during low-temperature cycle reliability testing extends the service life of the backlight module and ensures the brightness uniformity of the display device.

In one embodiment, please refer to Figures 3, 4, 5, 6 and 7; Figure 3 is a first top view of the backlight module provided by the embodiment of the present application; Figure 4 is an implementation of the present application. The second top view of the backlight module provided by the example; Figure 5 is the first structural schematic diagram of the backlight module provided by the embodiment of the present application; Figure 6 is an enlarged view of B in Figure 5; Figure 7 is the enlarged view of the backlight module of the present application A schematic structural diagram of the sealing unit provided in the embodiment.

In this embodiment, the light-emitting unit 20 includes but is not limited to a Mini-Light-Emitting Diode (Mini-LED); the sealing unit 30 includes but is not limited to packaging glue, and the packaging glue may be A transparent material with fluidity; the side of the sealing unit 30 away from the light-emitting unit 20 can be in any shape; preferably, the side of the sealing unit 30 away from the light-emitting unit 20 is in an arc shape; It can be understood that in this embodiment, the side of the sealing unit 30 away from the light-emitting unit 20 is arranged in an arc shape. Due to the curve characteristics of the arc shape, the light emitted by the light-emitting unit 20 is refracted. Convergence causes the light to be concentrated, thereby enhancing the luminous intensity of the backlight module 2 .

It should be noted that in this embodiment, a groove 11 is arranged around a light-emitting unit 20, where "a groove 11 surrounds" includes "a plurality of sub-grooves 11A surround the light-emitting unit 20" ” situation, for example, as shown in Figure 3, a groove 11 is arranged around a light-emitting unit 20, and the groove 11 is a continuous annular structure; for example, as shown in Figure 4, the groove 11 includes multiple Sub-groove 11A. A plurality of sub-grooves 11A surround one of the light-emitting units 20. This embodiment does not impose a specific limit on the number of sub-grooves 11A.

In this embodiment, the barb structure 110 includes a first sub-groove 11A and a second sub-groove 11B that communicate with each other. The second sub-groove 11B is located away from the first sub-groove 11A. On one side of the sealing unit 30, the width d2 of the second sub-groove 11B is greater than the width d1 of the first sub-groove 11A; wherein, the sealing unit 30 fills the first sub-groove 11A and The second sub-groove 11B.

It can be understood that in this embodiment, the groove 11 includes a first sub-groove 11A and a second sub-groove 11B that communicate with each other, and the second sub-groove 11B is located in the first sub-groove 11A. On the side away from the sealing unit 30 , the width d2 of the second sub-groove 11B is greater than the width d1 of the first sub-groove 11A. Since the sealing unit 30 is made of a transparent material with fluidity, Therefore, the sealing unit 30 can flow into the first sub-groove 11A and the second sub-groove 11B, so that the engaging portion 30B and the barb structure 110 are engaged with each other, thereby increasing the The contact area between the sealing unit 30 and the back plate 10 improves the bonding force between the sealing unit 30 and the back plate 10 , thereby preventing the sealing unit 30 and the back plate 10 from interfering with each other. The problem of degumming occurs between them.

Further, in this embodiment, the first sub-groove 11A extends along the first direction X, and the second sub-groove 11B extends along the second direction Y; wherein, the first sub-groove 11A has The side walls are inclined, and the horizontal cross-sectional area of the first sub-groove 11A close to the sealing unit 30 is larger than the horizontal cross-sectional area of the first sub-groove 11A away from the sealing unit 30. The first direction X and the second direction Y form a preset angle, wherein the preset angle is greater than or equal to 90 degrees and less than or equal to 150 degrees, wherein the second direction is parallel to the extension direction of the back plate .

It should be noted that in this embodiment, there are no restrictions on the range of the predetermined angle and the directions of the first direction X and the second direction Y. However, for convenience of description, this embodiment uses the following Taking the preset angle as 90°, the first direction as the X direction, and the second direction as the Y direction as an example to illustrate the technical solution of the present application.

Specifically, the first direction The width d1 gradually decreases along the first direction X, that is, the side walls of the first sub-groove 11A are inclined side walls.

It can be understood that in this embodiment, by arranging the first sub-groove 11A to extend along the first direction X, the second sub-groove 11B to extend along the second direction Y, the first direction The two directions Y form a preset angle, so that a barb structure 110 is formed in the groove 11, and the engaging portion 30B and the barb structure 110 engage with each other, thereby avoiding the problem in the prior art that when When the backlight module 2 is subjected to high and low temperature cycle reliability testing, due to the difference in thermal expansion coefficient between the packaging glue, the light-emitting unit 20 and the backplane 10, there is a gap between the packaging glue and the backplane. The risk of degumming may occur on the contact surface of 10; at the same time, by setting the width d1 of the first sub-groove 11A to gradually decrease along the first direction X, that is, the side wall of the first sub-groove 11A In order to tilt the side walls, the contact area between the sealing unit 30 and the back plate 10 is further increased, and the bonding force between the sealing unit 30 and the back plate 10 is improved.

Please combine FIG. 8 and FIG. 9 ; FIG. 8 is a second structural schematic diagram of the backlight module provided by the embodiment of the present application; FIG. 9 is an enlarged view of C in FIG. 8 .

In this embodiment, the structure of the backlight module is similar/identical to the first structure of the backlight module provided in the above embodiment. For details, please refer to the description of the backlight module in the above embodiment, which will not be repeated here. To go into details, the only difference between the two is:

In this embodiment, the orthographic projection of the first sub-groove 11A on the back plate 10 is located within the orthographic projection of the second sub-groove 11B on the back plate 10 . The groove 11B includes a first groove part 111B and a second groove part 112B that are connected, and the extending direction of the first groove part 111B is opposite to the extending direction of the second groove part 112B.

Specifically, in this embodiment, the first groove portion 111B extends along the second direction Y, the second groove portion 112B extends along the opposite direction to the second direction Y, and the sealing The glue unit 30 fills the first sub-groove 11A, the first groove portion 111B and the second groove portion 112B.

It can be understood that in this embodiment, by arranging the orthographic projection of the first sub-groove 11A on the back plate 10 to be within the orthographic projection of the second sub-groove 11B on the back plate 10, The second sub-groove 11B includes a connected first groove part 111B and a second groove part 112B. The first sub-groove 11A extends along the first direction X, and the first groove part 111B extends along the Extending in the second direction Y, the second groove portion 112B extends in the opposite direction to the second direction Y, so that the sealing unit 30 is between the first sub-groove 11A and the second sub-groove. There are two barb structures in the groove 11B. Compared with the above embodiment, this design further increases the contact area between the sealing unit 30 and the back plate 10, and improves the contact area between the sealing unit 30 and the back plate. 10, thereby avoiding the existing technology, when the backlight module 2 is subjected to high and low temperature cycle reliability testing, due to the between the packaging glue, the light-emitting unit 20 and the backplane 10 Due to the difference in thermal expansion coefficient, there may be a risk of debonding at the contact surface between the encapsulant and the backplane 10 .

Please refer to FIG. 10 , which is a third structural schematic diagram of a backlight module provided by an embodiment of the present application.

In this embodiment, the structure of the backlight module is similar/identical to the first structure of the backlight module provided in the above embodiment. For details, please refer to the description of the backlight module in the above embodiment, which will not be repeated here. To go into details, the only difference between the two is:

In this embodiment, the shape of the groove 11 is a wedge shape; it can be understood that in this embodiment, by setting the shape of the groove 11 to be a wedge shape, the engaging portion 30B and the barb structure 110 interact with each other. The sealing unit 30 and the back plate 10 are tightly bonded together by snapping, thereby increasing the bonding strength of the sealing unit 30 and the back plate 10 and solving the problem of high performance of the existing backlight module 2. During low-temperature cycle reliability testing, degumming may occur; at the same time, by adopting the shape of the groove 11 as a wedge, its structure is simple, which can simplify the manufacturing process and reduce production costs.

This embodiment provides a display device, which includes a display panel and the backlight module described in any of the above embodiments.

In this embodiment, the display panel includes a display area and a non-display area adjacent to the display area, and the backlight module is located on the backlight side of the display panel and is arranged corresponding to the display area.

It should be noted that in this embodiment, the display panel includes but is not limited to a liquid crystal display (LCD). This embodiment uses the display panel as a liquid crystal display as an example to illustrate the technical solution of the present application.

It can be understood that the backlight module has been described in detail in the above embodiments, and the description will not be repeated here.

In specific applications, the display device can be a display screen of a smart phone, tablet computer, notebook computer, smart bracelet, smart watch, smart glasses, smart helmet, desktop computer, smart TV or digital camera, or even Applied to electronic devices with flexible displays.

To sum up, the present application provides a backlight module and a display device. The backlight module includes a backplane, a plurality of light-emitting units and a plurality of sealing units. The backplane includes a plurality of grooves arranged at intervals. The light-emitting unit is disposed on the back plate, and the sealing unit is disposed on a side of the light-emitting unit away from the back plate. One sealing unit is provided corresponding to one light-emitting unit. The sealing unit includes The sealing part and the clamping part, the sealing part is located on the side of the clamping part away from the back plate. In the embodiment of the present application, a groove is provided around a light-emitting unit, and the groove is The groove includes a barb structure. In one of the sealing units and the corresponding light-emitting unit, the sealing part covers the light-emitting unit, and the engaging part and the barb structure engage with each other, thereby increasing the The bonding force between the sealing unit and the backplane solves the degumming phenomenon that may occur in the existing backlight module during high and low temperature cycle reliability testing, prolongs the service life of the backlight module, and ensures that all The brightness uniformity of the display device.

In the above embodiments, each embodiment is described with its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

The above is a detailed introduction to a backlight module and a display device provided by embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the present application. The application method and its core idea; at the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of this application. In summary, the contents of this specification should not be understood as Limitations on this Application.

Claims (10)

1. A backlight module, comprising:

the backboard comprises a plurality of grooves which are arranged at intervals;

the light-emitting units are arranged on the backboard;

the sealing units are arranged on one side, far away from the back plate, of the light-emitting units, one sealing unit is arranged corresponding to one light-emitting unit, each sealing unit comprises a sealing part and a clamping part, and the sealing part is positioned on one side, far away from the back plate, of the clamping part;

the groove is arranged around the light-emitting unit, the groove comprises a barb structure, the sealing unit and the corresponding light-emitting unit are arranged in the groove, the sealing part covers the light-emitting unit, and the clamping part is mutually clamped with the barb structure.

2. The backlight module according to claim 1, wherein the barb structure comprises a first sub-groove and a second sub-groove which are communicated with each other, and the second sub-groove is positioned on one side of the first sub-groove away from the sealing unit;

the first sub-grooves extend along a first direction, the second sub-grooves extend along a second direction, and the first direction and the second direction form a preset angle.

3. The backlight module according to claim 2, wherein the predetermined angle is greater than or equal to 90 degrees and less than or equal to 150 degrees, and wherein the second direction is parallel to the extending direction of the back plate.

4. The backlight module according to claim 2, wherein the first sub-groove has an inclined sidewall, and a horizontal cross-sectional area of the first sub-groove near the sealing unit is larger than a horizontal cross-sectional area of the first sub-groove far from the sealing unit.

5. A backlight module according to claim 4, wherein the side wall of the first sub-groove is linear or curved in a cross section perpendicular to the back plate.

6. The backlight module of claim 4, wherein the orthographic projection of the first sub-groove on the back plate is located within the orthographic projection of the second sub-groove on the back plate;

the second sub-groove comprises a first groove part and a second groove part which are communicated, and the extending direction of the first groove part is opposite to that of the second groove part.

7. A backlight module according to claim 2, wherein the width of the second sub-groove is larger than the width of the first sub-groove in a direction perpendicular to the back plate.

8. A backlight module according to claim 2, wherein the depth of the first sub-groove is greater than the depth of the second sub-groove.

9. A backlight module according to claim 1, wherein the grooves are wedge-shaped.

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