CN209946439U

CN209946439U - Backlight module and display device

Info

Publication number: CN209946439U
Application number: CN201920757668.9U
Authority: CN
Inventors: 周政
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-01-14
Anticipated expiration: 2029-05-24

Abstract

The application provides a backlight unit, display device, wherein backlight unit glues the frame and is located the light guide plate that glues the frame including gluing, thereby form the elastic construction through the digging groove portion that forms the bellying on gluing the frame and correspond with the bellying, the bellying of this elastic construction is used for contacting with the lateral wall of light guide plate, the bellying is because of receiving the extrusion of light guide plate and to digging groove portion one side skew, thereby make digging groove portion take place deformation, make elastic construction and light guide plate form interference fit, and then be fixed in gluey frame with the light guide plate and do not take place the skew. This application is in order to solve on-vehicle display device and produce abnormal sound and the scotch of light guide plate site and arouse optics bad scheduling problem when backlight unit rocks.

Description

Backlight module and display device

Technical Field

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

Background

Along with the development of display technology, the application of on-vehicle display module assembly is also more and more, wherein because the high reliability requirement of car rule, structural design requirement to on-vehicle demonstration is also higher relatively.

Aiming at the high reliability requirement of the vehicle gauge, if the light guide plate in the backlight source is not limited and fixed, the problems that the light guide plate impacts the side wall to generate abnormal sound when the module shakes and the dots of the light guide plate are scratched to cause poor optics when the module shakes exist; at present, the vehicle-mounted display module is usually limited by using a plurality of rubber blocks (rubber) to prop against the light guide plate.

The rubber blocks are relatively soft and limited by the processing technology, so that the thickness of the rubber blocks may be uneven during cutting, and the light guide plate cannot be assembled in place; since a plurality of rubber blocks are additionally required to be incorporated, a backlight assembly process is increased, resulting in an increase in cost.

Therefore, the prior art has defects and needs to be improved urgently.

SUMMERY OF THE UTILITY MODEL

The application provides a backlight unit, display device can solve current on-vehicle display device and when backlight unit rocks light guide plate striking lateral wall produce abnormal sound and light guide plate site scotch and arouse the bad problem of optics to and solve light guide plate equipment precision not good, and the complicated scheduling problem of process.

In order to solve the above problems, the technical solution provided by the present application is as follows:

the application provides a backlight module, which comprises a rubber frame, a light source, a light guide plate and an optical diaphragm, wherein the light source, the light guide plate and the optical diaphragm are positioned in the rubber frame;

the glue frame is provided with an elastic structure, the elastic structure is in contact with the side wall of the light guide plate and forms interference fit with the light guide plate, so that the light guide plate is fixed in the glue frame.

In the backlight module of this application, elastic construction with glue frame design as an organic whole, elastic construction includes the bellying and corresponds the groove portion that digs that the bellying set up, the bellying is located glue the frame and be close to on the lateral wall of light guide plate one side, the opening that digs the groove portion is located glue the top of frame.

In the backlight module of the present application, one of the trench digging portions at least corresponds to one of the protrusion portions, and in a length extending direction of the trench digging portion, a length of the trench digging portion is greater than or equal to a length of the protrusion portion.

In the backlight module, in the depth extending direction of the groove part, the depth of the groove part is larger than or equal to the width of the convex part.

In the backlight module of the application, the distance between the boundary of one side of the light guide plate and the groove digging part is smaller than or equal to the distance between the boundary of one side of the light guide plate and the groove digging part and the distance between the boundary of one side of the light guide plate and the rubber frame.

In the backlight module, the cross section of the protrusion is in one or more of a rectangle, a trapezoid and an arc shape.

In the backlight module of the application, a fillet is formed between the inner wall of the groove part close to one side of the light guide plate and the adjacent inner wall.

In the backlight module of the application, when the light guide plate is assembled, the side wall of the light guide plate is in contact with the protruding portion of the elastic structure, the protruding portion is extruded by the light guide plate to deviate towards one side of the groove digging portion, and the groove digging portion deforms, so that the elastic structure and the light guide plate form interference fit.

In the backlight module of this application, glue at least two of frame be provided with on the lateral wall elastic structure, elastic structure still with the optics diaphragm forms interference fit.

In order to solve the above problem, the present application further provides a display device, which includes a display panel and the backlight module as described above.

The beneficial effect of this application does: compare in current on-vehicle display device, thereby backlight unit, display device that this application provided form elastic construction through design bellying and digging groove portion on gluey frame, when the lateral wall contact of elastic construction and light guide plate, the bellying makes digging groove portion take place deformation because of receiving the extrusion of light guide plate for elastic construction and light guide plate form interference fit, realize the spacing of light guide plate and fix. By adopting the design, the cost and the production time of additionally designing the rubber block can be saved, and the phenomena of abnormal sound generated when the backlight module shakes the light guide plate to impact the side wall and bad optics caused by scratching of the mesh points of the light guide plate can be avoided.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of an elastic structure of a backlight module provided in an embodiment of the present application before deformation;

fig. 3 is a schematic structural diagram of an elastic structure of a backlight module according to an embodiment of the present disclosure after deformation.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. Directional phrases used in this application, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], etc., refer only to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way limiting. In the drawings, elements having similar structures are denoted by the same reference numerals.

This application is to current on-vehicle display device, and there is the light guide plate striking lateral wall when backlight unit rocks to produce abnormal sound and the scotch of light guide plate site and arouse the bad problem of optics to and light guide plate equipment precision is not good, and technical problem such as the process is complicated, and this defect can be solved to this embodiment.

The application provides backlight unit is applicable to on-vehicle display device, but not so limit, can also be applied to portable electronic equipment or wearing formula electronic equipment and other display device.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure. The backlight module provided by the embodiment can be a side-in type backlight module and can also be a direct type backlight module. The backlight module includes: the light source module includes a rubber frame 10, and a light source 20, a light guide plate 30, and an optical film (not shown) located in the rubber frame 10. The rubber frame 10 is provided with an elastic structure 100, the elastic structure 100 contacts with the side wall of the light guide plate 30, and the elastic structure 100 and the light guide plate 30 form an interference fit, so that the light guide plate 30 is fixed in the rubber frame 10.

The elastic structure 100 and the rubber frame 10 are designed as a whole, the elastic structure 100 includes a protrusion 101 and a groove digging portion 102 corresponding to the protrusion 101, the protrusion 101 is located on the side wall (side surface) of the rubber frame 10 near the light guide plate 30, the groove digging portion 102 is located inside the rubber frame 10, and an opening of the groove digging portion 102 is located at the top of the rubber frame 10.

It can be understood that the backlight module is used for aligning and attaching with a display panel, and the top of the rubber frame 10 is the side of the backlight module attached with the display panel.

As shown in fig. 1, one of the protrusions 101 corresponds to one of the grooves 102, thereby forming the elastic structure 100. In the longitudinal extension direction of the groove 102, the length of the groove 102 is greater than or equal to the length of the protrusion 101. In the depth extending direction of the groove 102, the depth of the groove 102 is greater than or equal to the width of the protrusion 101. That is, in the direction from the light guide plate 30 to the side of the plastic frame 10, the projection of the protrusion 101 on the side wall of the plastic frame 10 falls within the projection range of the groove 102 on the side wall of the plastic frame 10. Of course, this is not a limitation.

In one embodiment, in a direction from the light guide plate 30 side to the rubber frame 10 side, a projection of the protrusion 101 on the side wall of the rubber frame 10 is located in a middle position of a projection of the groove 102 on the side wall of the rubber frame 10.

The groove width of the groove digging part 102 is smaller than the width of the rubber frame 10, and the distance from the boundary of the side of the rubber frame 10 close to the light guide plate 30 to the groove digging part 102 is smaller than or equal to the distance from the boundary of the side of the rubber frame 10 far away from the light guide plate 30 to the groove digging part 102. In fig. 1, the width of the rubber frame 10 on both sides of the digging groove part 102 is the same, and the width can be kept about 0.6 mm.

In this embodiment, the depth of the digging groove 102 can be limited according to the actual manufacturing process, but the position of the elastic structure 100 on the plastic frame 10 should be located at the predetermined position of the light guide plate 30 in the plastic frame 10.

The height of the protrusion 101 needs to be slightly greater than the distance between the edge of the light guide plate 30 and the rubber frame 10, which may be 0.1mm to 0.5mm, and the specific height may be defined according to the actual process, as long as the top of the protrusion 101 contacts the light guide plate 30 and forms an interference fit.

The elastic structures 100 are disposed on at least two side walls of the rubber frame 10, and the illustration only shows that the elastic structures 100 are disposed on two adjacent side walls of the rubber frame 10, but may also be side walls on two opposite sides, which is not limited herein. In addition, under the condition that the space allows, a plurality of elastic structures 100 can be formed on one side wall of the plastic frame 10, so that the light guide plate 30 is prevented from generating abnormal sound and vibration scratches caused by large displacement.

In another embodiment, the elastic structure 100 forms an interference fit with the optical film, including but not limited to a reflective plate, a diffusion plate, etc., in addition to the interference fit with the light guide plate 30.

In another embodiment, the protrusion 101 is step-shaped, which is suitable for the light guide plate 30 with different sizes, and the step-shaped structure can also ensure that the protrusion 101 is not easily scratched by the light guide plate 30, and the specific shape of the protrusion 101 can be set according to the actual process.

In this embodiment, when the backlight module is shaken, the light guide plate 30 may collide with the sidewall of the plastic frame 10 to generate abnormal sound, and the dots of the light guide plate 30 may be scratched to cause optical defects. Since the backlight module of the present embodiment directly uses a part of the rubber frame 10 as the elastic structure 100, it is not necessary to add a new process and structure, and thus the cost and the production time of designing a rubber block are saved.

Fig. 2 is a schematic structural view of an elastic structure of a backlight module provided in the embodiment of the present application before deformation. The protrusion 101 of the elastic structure 100 is used for contacting with the edge of the light guide plate 30, and a gap exists between the other part of the rubber frame 10 and the light guide plate 30. In the present embodiment, the cross-sectional shape of the protrusion 101 is a trapezoid, and the length of the lower base of the trapezoid is about 5mm, but not limited thereto.

A rounded corner is formed between the inner wall of the trench 102 adjacent to the light guide plate 30. The rubber frame 10 between the convex part 101 and the digging groove part 102 is prevented from being broken due to stress concentration in the process of deforming the digging groove part 102. Alternatively, the corners of the digging groove part 102 are all set to be round corners. Or, the corners of the protruding portion 101 and the rubber frame 10 are designed to be rounded.

The cross-sectional shape of the convex part 101 includes, but is not limited to, one or any combination of more than one of a rectangle, a trapezoid and an arc.

Fig. 3 is a schematic structural view of an elastic structure of a backlight module according to an embodiment of the present disclosure after deformation. When the light guide plate 30 is assembled, after the side wall of the light guide plate 30 contacts the protruding portion 101 of the elastic structure 100, the protruding portion 101 is pressed by the light guide plate 30 to deflect toward the side of the groove 102, so that the groove 102 deforms, as shown in the figure, the groove 102 applies force to the light guide plate 30 through the protruding portion 101, so that the elastic structure 100 and the light guide plate 30 form an interference fit, and the light guide plate 30 is limited and fixed. In addition, after the groove 102 is deformed, the peripheral edge of the light guide plate 30 is attached to the sidewall of the plastic frame 10, and the contact area between the light guide plate 30 and the plastic frame 10 is increased, so that the stability of the light guide plate 30 is further improved.

The application also provides a display device, which comprises a display panel and the backlight module. The display device is suitable for vehicle-mounted display, but not limited to this. The display panel may be a liquid crystal display panel, an OLED display panel, a WOLED display panel, or the like.

To sum up, thereby backlight unit, display device that this application provided form elastic construction through design bellying and grooving portion on gluey frame, and when elastic construction contacted with the lateral wall of light guide plate, the bellying made grooving portion take place deformation because of receiving the extrusion of light guide plate for elastic construction and light guide plate form interference fit, realized the spacing of light guide plate fixedly. By adopting the design, the cost and the production time of additionally designing the rubber block can be saved, and the phenomena of abnormal sound generated when the backlight module shakes the light guide plate to impact the side wall and bad optics caused by scratching of the mesh points of the light guide plate can be avoided.

In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.

Claims

1. A backlight module is characterized by comprising a rubber frame, a light source, a light guide plate and an optical diaphragm, wherein the light source, the light guide plate and the optical diaphragm are positioned in the rubber frame;

2. The backlight module as claimed in claim 1, wherein the elastic structure is integrally formed with the plastic frame, the elastic structure includes a protrusion and a groove corresponding to the protrusion, the protrusion is located on a sidewall of the plastic frame adjacent to the light guide plate, and an opening of the groove is located at a top of the plastic frame.

3. The backlight module as claimed in claim 2, wherein one of the recessed portions corresponds to at least one of the protrusions, and the length of the recessed portion is greater than or equal to the length of the protrusion in the extending direction of the length of the recessed portion.

4. A backlight module according to claim 2, wherein the depth of the recessed portion is greater than or equal to the width of the protrusion in the depth extending direction of the recessed portion.

5. The backlight module according to claim 2, wherein a distance from a boundary of the side of the rubber frame close to the light guide plate to the groove is smaller than or equal to a distance from a boundary of the side of the rubber frame away from the light guide plate to the groove.

6. The backlight module according to claim 2, wherein the cross-sectional shape of the protrusion is one or more of rectangular, trapezoidal and arc-shaped.

7. The backlight module as claimed in claim 2, wherein a rounded corner is formed between the inner wall of the trench portion adjacent to the light guide plate and the adjacent inner wall.

8. The backlight module as claimed in claim 2, wherein when the light guide plate is assembled, the side wall of the light guide plate contacts with the protrusion of the elastic structure, the protrusion is pressed by the light guide plate to be biased to one side of the groove, and the groove is deformed, so that the elastic structure forms an interference fit with the light guide plate.

9. The backlight module according to claim 2, wherein the elastic structures are disposed on at least two of the sidewalls of the plastic frame, and the elastic structures further form an interference fit with the optical film.

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