CN211236521U

CN211236521U - Backlight module and liquid crystal display device

Info

Publication number: CN211236521U
Application number: CN202020210263.6U
Authority: CN
Inventors: 张启平; 凌遵干
Original assignee: BOE Technology Group Co Ltd; Hefei BOE Display Lighting Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei BOE Display Lighting Co Ltd
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-08-11
Anticipated expiration: 2030-02-26

Abstract

The utility model provides a backlight module and liquid crystal display device belongs to and shows technical field. Backlight unit includes the backplate and glues the frame, glues the frame including gluing the frame main part and connecting the extension of gluing the frame main part, glues the frame main part and covers the backplate edge, and the extension includes, to the first extension section of keeping away from the direction extension at backplate center, and first extension section is equipped with first mounting hole for install liquid crystal display device's printed circuit board. The first mounting hole on the glue frame is fixed with the printed circuit board, so that the structural integrity of the back plate is ensured, and the problem of light leakage existing when the back plate and the printed circuit board are fixed is solved.

Description

Backlight module and liquid crystal display device

Technical Field

The utility model relates to a show technical field, particularly, relate to a backlight unit and liquid crystal display device.

Background

The liquid crystal display device comprises main components such as a liquid crystal display panel, a backlight module, a Printed Circuit Board (PCB) and the like, wherein the printed circuit board is electrically connected with the display panel to control the display of the display panel, and meanwhile, the printed circuit board is also arranged on a back plate of the backlight module to realize the fixation of the printed circuit board.

The printed circuit board needs to be firmly fixed on the back plate, and the light emitting effect of the backlight module cannot be influenced, so that the fixing mode of the printed circuit board and the backlight module is an important premise for ensuring that the liquid crystal display device has a good display effect.

It should be noted that the information of the present invention in the above background section is only for enhancing the understanding of the background of the present invention, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

An object of the utility model is to provide a backlight unit and liquid crystal display device guarantee good light-emitting effect and display effect.

According to the utility model discloses an aspect provides a backlight module, is applied to liquid crystal display device, include:

a back plate;

glue the frame, including gluing the frame main part and connecting glue the extension of frame main part, it is the loop configuration and cover to glue the frame main part the backplate edge, the extension includes first extension section, first extension section is to keeping away from the direction at backplate center extends, first extension section is equipped with first mounting hole, first mounting hole is used for the installation liquid crystal display device's printed circuit board.

In an exemplary embodiment of the present application, the back plate includes a bottom plate, a side plate disposed at an edge of the bottom plate, and a cover plate connected to the side plate and disposed opposite to the bottom plate, wherein the bottom plate edge, the side plate, and the cover plate are integrally U-shaped; the rubber frame main body covers one side, far away from the bottom plate, of the cover plate, and the first extending section extends towards the direction far away from the center of the bottom plate.

In an exemplary embodiment of this application, the extension still includes the second extension section, the second extension section is connected glue frame main part and first linkage segment, the second extension section is followed the curb plate of backplate extends and attached in the curb plate is kept away from in the one side at bottom plate center.

In an exemplary embodiment of the present application, the backlight module further includes a first adhesive layer and a second adhesive layer, the first adhesive layer is disposed between the cover plate of the back plate and the glue frame main body, and the second adhesive layer is disposed between the side wall of the back plate and the second extending section.

In an exemplary embodiment of the present application, the rubber frame main body, the first extension section, and the second extension section are an integral structure.

In an exemplary embodiment of the present application, the extension is provided in a plurality.

In an exemplary embodiment of the present application, the backlight assembly further includes:

the light guide plate is arranged on the bottom plate of the back plate;

the optical film material covers one side of the light guide plate, which is far away from the back plate;

the light source is arranged on the bottom plate of the back plate and is positioned at the side edge of the light guide plate;

the light guide plate edge, the optical film material edge and the light source are all located in a U-shaped structure formed by the bottom plate, the side plate and the cover plate.

According to another object of the present application, there is also provided a liquid crystal display device including:

a liquid crystal display panel;

in the backlight module, the liquid crystal display panel is arranged on one side of the optical film material in the backlight module, which is far away from the back plate;

the printed circuit board is arranged in the first mounting hole of the back plate and is electrically connected with the liquid crystal display panel.

In an exemplary embodiment of the present application, the printed circuit board has a second mounting hole corresponding to the first mounting hole, and the printed circuit board and the back plate form a threaded connection through a connector inserted into the first mounting hole and the second mounting hole.

In an exemplary embodiment of the present application, a press-riveting stud is disposed in each of the first mounting hole and the second mounting hole, and the inner wall of the press-riveting stud and the outer wall of the connecting member have matching threads.

The utility model discloses a backlight unit's gluey frame is including gluing the frame main part and connecting the extension of gluing the frame main part, and the extension includes the first extension section that extends to the direction of keeping away from the backplate center, and first extension section is equipped with first mounting hole for install liquid crystal display device's PCB board. This application utilizes gluey frame to realize being connected of backlight unit and PCB board, can effectively fix the PCB board, also can guarantee that backplate structure is complete, avoids taking place because the light leak phenomenon that backplate structure unevenness leads to. Meanwhile, the structure does not need to turn over the back plate, and does not need to change the structure of the PCB, thereby saving the processing technology. The liquid crystal display device comprising the backlight module has the advantages that the problem of top white is avoided, and the display effect is good.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a top view of a backlight module of a related art LCD device;

FIG. 2 is a schematic view of a combined structure of a light incident side of a side-entry backlight module and a PCB in the related art;

FIG. 3 is a rear view of the back plate of FIG. 2;

FIG. 4 is a partial enlarged view of a backlight module with a recessed back plate according to the related art;

fig. 5 is a schematic structural view of a light incident side of a backlight module according to an embodiment of the present invention;

FIG. 6 is a top view of the rubber frame portion of FIG. 5;

fig. 7 is a schematic view of the combined structure of the backlight module and the PCB of the present invention.

In fig. 1-4: 10a, a back plate; 20a, a PCB board; 11a, a folding part; 12a, mounting holes; 50a, screws; 40a, a light source; 41a, a light source flexible circuit board; 61a, a reflective sheet;

in fig. 5-7: 10. a back plate; 20. a PCB board; 30. a rubber frame; 11. a base plate; 12. a side plate; 13. a cover plate; 31. a rubber frame main body; 32. an extension portion; 321. a first extension section; 322. a second extension section; 323. a first mounting hole; 210. a second mounting hole; 40. a light source; 41. a light source flexible circuit board; 50. a connecting member; 60. a light guide plate; 70. an optical film material; 81. a first adhesive layer; 82. a second adhesive layer; 90. a flexible circuit board; 100. pressing and riveting the stud; 110. a liquid crystal display panel.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

In the related art, fig. 1 is a top view of a backlight module of a liquid crystal display device, fig. 2 is a cross-sectional view of a structure after a back plate 10a and a printed circuit board (PCB board 20a) of a side-in type backlight module are fixed, meanwhile, the structure of the backlight module shown therein is a cross-sectional view of a portion L in fig. 1 along a-a direction, and fig. 3 is a back view of the back plate 10a in fig. 2. As can be seen from fig. 1 to 3, the edge of the back plate 10a is partially folded outward to form a folded portion 11a, and the folded portion 11a is provided with a mounting hole 12 a. The PCB 20a is provided with a through hole matching with the mounting hole 12a, and the PCB 20a and the back panel folded portion 11a are fixedly connected by a screw 50 a.

Referring to fig. 2, the back plate 10a is seen from the back side, and the light source flexible circuit board 41a and the reflective sheet 61a are exposed at the fold-back regions. In this structure, the back panel flap 11a is folded up from the bottom surface of the back panel 10a, and the back panel material is pulled during folding, and it is inevitable that a flat surface is hardly formed near the folding hole. As shown by the arrow in fig. 2, the back plate 10a often protrudes inward at the position indicated by the arrow in the figure, so that the light source flexible circuit board 41a connected below the lateral LED light source 40a is pushed up by the protrusion of the back plate, and fig. 4 is a partial enlarged view of the backlight module with the back plate recessed inward.

Based on the above problem, the utility model provides a backlight module in the embodiment, can be fixed with liquid crystal display device's PCB board to avoid the problem of the light leak that above-mentioned structure produced.

Fig. 5 is a schematic structural view of a light incident side of a backlight module according to an embodiment of the present invention, and fig. 6 is a top view of a portion of the rubber frame 30 in fig. 5. The backlight module of the embodiment includes a back plate 10 and a rubber frame 30, the rubber frame 30 includes a rubber frame main body 31 having an annular structure and an extension portion 32 connected to the rubber frame main body 31, the rubber frame main body 31 covers the edge of the back plate 10, the extension portion 32 includes a first extension section 321, the first extension section 321 extends towards a direction (right side in the figure) far away from the center of the back plate 10, the first extension section 321 is provided with a first mounting hole 323, and the first mounting hole 323 is used for mounting a PCB of the liquid crystal display device.

According to the application, a local area of the rubber frame 30 extends outwards to form a first extension section 321, and a mounting hole for fixing a PCB is formed in the first extension section 321. As shown in fig. 7, when the rubber frame 30 is fixed to the PCB 20, the rubber frame 30 can be fixed only by providing the second mounting hole 210 at the corresponding position of the PCB 20. This application utilizes gluey frame to realize being connected of backlight unit and PCB board, has avoided following backplate "borrowing material", and backplate structure is complete and the bottom is level and smooth, and light source flexible circuit board 41 can not jack-up again to can not take place because the structure unevenness and the light leak phenomenon that leads to. Meanwhile, the structure does not need to turn over the back plate, and does not need to change the structure of the PCB, thereby saving the processing technology.

The following is a detailed description of the backlight module according to the embodiments of the present invention:

the number of the extension parts 32 can be determined according to the size of the rubber frame 30 and the PCB 20, the requirement of the fixing firmness degree, and the like, and when the number of the extension parts 32 is multiple, the fixing effect of the PCB 20 is firmer. The position of the extension portion 32 corresponds to the position of the PCB 20, and usually, the PCB 20 is connected to one side of the backlight module, and the rubber frame 30 is provided with the extension portion 32 only at the corresponding side. The extension length of the first extension 321 in the extension 32 can be determined according to the corresponding mounting position on the PCB 20, and the strength of the extension is also required. The first extension 321 and the rubber frame body 31 may be an integrally formed structure.

As shown in fig. 5, in the present embodiment, the back plate 10 includes a bottom plate 11, a side plate 12, and a cover plate 13 connected in sequence, the side plate 12 is disposed at an edge of the bottom plate 11, the cover plate 13 is connected to the side plate 12 and disposed opposite to the bottom plate 11, and in the light incident side region, the edge of the bottom plate 11, the side plate 12, and the cover plate 13 are U-shaped as a whole. The rubber frame body 31 covers a side of the cover plate 13 away from the bottom plate 11 (i.e., an upper side in the figure), and the first extension section 321 of the rubber frame 30 extends in a direction away from a center of the bottom plate 11 (i.e., a right side in the figure). The back plate 10 with the U-shaped structure can install the light source 40 in the U-shaped structure in the assembling process of the side-in type backlight module, the U-shaped structure can improve the utilization efficiency of the light emitted by the light source 40, and meanwhile, the poor pictures such as light leakage and the like at the light-in side are prevented.

Specifically, as shown in fig. 5, the backlight module further includes a light guide plate 60, an optical film material 70 and a light source 40, the light guide plate 60 and the optical film material 70 are sequentially disposed on the bottom plate 11 of the back plate 10 from bottom to top, and the light source 40 is disposed on the bottom plate 11 of the back plate and located at a side of the light guide plate 60 to form a side-entering light source 40. The light source 40 may be disposed at one side of the light guide plate 60 to form a single-sided light source, or disposed at the opposite two sides to form a double-sided light source, and accordingly, the back plate 10 forms a U-shaped structure at the side where the light source 40 is disposed to cover the corresponding light source 40. The light source 40 may be an LED light bar or other light source, which is not particularly limited in this application.

As shown in fig. 5, the extension portion 32 further includes a second extension portion 322, the second extension portion 322 connects the rubber frame body 31 and the first extension portion 321, and the second extension portion 322 extends along the back plate side plate 12 (vertically downward in the drawing) and is attached to one side of the side plate 12 away from the center of the bottom plate 11. When the heights of the PCB 20 and the rubber frame 30 are not consistent, the second extension section 322 can keep the heights of the first extension section 321 and the mounting portion of the PCB 20 consistent, so as to facilitate fixing. Meanwhile, the second extension section 322 is tightly attached to the side plate 12, so that the strength of the overall structure of the rubber frame 30 is improved. The extension length of the second extension 322 is set according to the height of the PCB board 20, and this application does not specifically limit this. The first extension 321, the second extension 322 and the rubber frame body 31 may be an integrally formed structure.

Further, backlight unit still includes first adhesive linkage 81 and second adhesive linkage 82, first adhesive linkage 81 set up in the apron 13 of backplate 10 with glue between the frame main part 31 for paste apron 13 and glue frame main part 31, second adhesive linkage 82 sets up between the lateral wall of backplate 10 and second extension section 322 for paste lateral wall and second extension section 322, and the adhesive linkage makes gluey frame 30 firmly fix on backplate 10. The first adhesive layer 81 and the second adhesive layer 82 may be two independent parts or may be an integral structure. The two adhesive layers can adopt double-sided adhesive tape or optical adhesive and the like.

The embodiment of the present invention further provides a liquid crystal display device, as shown in fig. 7, including the liquid crystal display panel 110, the backlight module and the PCB 20 in the above embodiments. The liquid crystal display panel 110 is disposed on a side of the optical film material 70 away from the back plate 10 in the backlight module, the PCB 20 is mounted in the first mounting hole 323 of the back plate 10, and the PCB 20 is further electrically connected to the liquid crystal display panel 110.

The PCB board 20 may be mounted in the first mounting hole 323 in various ways. In one embodiment, as shown in fig. 7, the PCB 20 is provided with a second mounting hole 210 corresponding to the first mounting hole 323, and the PCB 20 and the back plate 10 are screwed by a connector 50 inserted into the first mounting hole 323 and the second mounting hole 210, so as to fix the rubber frame 30 and the PCB 20. That is, the first and second mounting

holes

323 and 210 are through holes, both of which have internal threads on the inner walls thereof, and the connecting member 50 has external threads to be engaged with the internal threads. The connecting member 50 may be embodied as a screw.

Further, in one mode of the screw connection, an internal thread structure that matches with the external thread of the screw is directly provided on the inner walls of the first mounting hole 323 and the second mounting hole 210, and in another mode, a rivet stud 100 (also referred to as a rivet post) is provided in the first mounting hole 323 and the second mounting hole 210, and the rivet stud 100 has an internal thread that matches with the external thread of the screw. During mounting, taking the mounting manner shown in fig. 7 as an example, the second mounting hole 210 of the PCB 20 is located above the first mounting hole 323 of the rubber frame 30, and a screw is inserted into the second mounting hole 210 and the first mounting hole 323 from top to bottom and tightened to fix the rubber frame 30 and the PCB 20. Of course, the screw may be installed by passing it from bottom to top for fixing.

In the present embodiment, the PCB 20 and the liquid crystal display panel 110 may be electrically connected through the flexible circuit board 90 to control the display panel.

The liquid crystal display device of the application adopts the backlight module, so that the problem of white top at the edge can not occur, and the display effect is good. The liquid crystal display device can be used in various products such as televisions, computers, mobile phones, billboards, cameras, electronic books, navigators and the like, and the specific application field is not limited by the application.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims

1. A backlight module applied to a liquid crystal display device is characterized by comprising:

a back plate;

2. The backlight module as claimed in claim 1, wherein the back plate comprises a bottom plate, a side plate disposed at an edge of the bottom plate, and a cover plate connected to the side plate and disposed opposite to the bottom plate, wherein the edge of the bottom plate, the side plate and the cover plate are integrally U-shaped; the rubber frame main body covers one side, far away from the bottom plate, of the cover plate, and the first extending section extends towards the direction far away from the center of the bottom plate.

3. The backlight module as claimed in claim 2, wherein the extension portion further comprises a second extension section, the second extension section connects the rubber frame main body and the first connection section, and the second extension section extends along the side plate of the back plate and is attached to one side of the side plate away from the center of the bottom plate.

4. The backlight module according to claim 3, further comprising a first adhesive layer and a second adhesive layer, wherein the first adhesive layer is disposed between the cover plate and the adhesive frame body, and the second adhesive layer is disposed between the sidewall of the back plate and the second extending section.

5. The backlight module as claimed in claim 3, wherein the frame body, the first extension section and the second extension section are an integral structure.

6. A backlight module according to any one of claims 1-5, wherein the number of the extensions is plural.

7. A backlight module according to any of claims 2-5, further comprising:

the light guide plate is arranged on the bottom plate of the back plate;

8. A liquid crystal display device, comprising:

a liquid crystal display panel;

the backlight module of any one of claims 1-7, wherein the liquid crystal display panel is disposed on a side of the optical film material away from the back plate in the backlight module;

9. The liquid crystal display device of claim 8, wherein the printed circuit board has a second mounting hole corresponding to the first mounting hole, and the printed circuit board is screwed to the back plate via a connector inserted into the first and second mounting holes.

10. The liquid crystal display device according to claim 9, wherein a rivet pressing stud is arranged in each of the first mounting hole and the second mounting hole, and an inner wall of the rivet pressing stud and an outer wall of the connecting member have matching threads.