CN216622917U

CN216622917U - Backlight module and display device

Info

Publication number: CN216622917U
Application number: CN202123197642.XU
Authority: CN
Inventors: 王维; 刘刚; 杨伟恒
Original assignee: TCL Huaxing Photoelectric Technology Co Ltd
Current assignee: TCL Huaxing Photoelectric Technology Co Ltd
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2022-05-27
Anticipated expiration: 2031-12-20

Abstract

The invention provides a backlight module and a display device, wherein the backlight module comprises a back frame, a light guide plate positioned in the back frame and an optical film layer positioned on the light guide plate; the back frame comprises a bottom plate and side plates bent along the edge of the bottom plate, reserved gaps exist between adjacent side faces in the areas of four corners of the back frame due to beveling, and light shielding layers are arranged in the gaps; according to the backlight module, the light guide plate, the optical film layer and the back frame form separation spaces due to the reserved gaps, the separation spaces are distributed on the edges of the four corners of the backlight module, and the elastic shading materials are selected to fill the separation spaces, so that the backlight module can be effectively prevented from leaking light on the four corners of the edge, and the light emitting efficiency of the backlight module is improved.

Description

Backlight module and display device

Technical Field

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

Background

Recently, with the development of various mobile electronic devices, there is an increasing demand for lighter, thinner, shorter and smaller flat panel display devices applicable to these devices, such as Liquid Crystal Displays (LCDs), Plasma Display Panels (PDPs), Field Emission Displays (FEDs), Vacuum Fluorescent Displays (VFDs), as flat panel display devices, which are actively researched, and the LCDs are receiving attention due to the advantages of mass production of LCDs, simple driving units, implementation of high image quality, realization of large-sized screens.

An LCD display is a transmissive display device that displays a desired image on a screen by adjusting light transmitted through liquid crystal according to refractive index anisotropy of liquid crystal molecules. Accordingly, the LCD display includes a backlight as a light source, which provides light transmitted through the liquid crystal layer to display an image. Generally, backlights are classified into two types: a side-type backlight in which lamps are installed at a side of a liquid crystal panel and provide light to a liquid crystal layer; and in the direct type backlight, the lamps directly supply light from a lower portion of the liquid crystal panel.

In the related art LCD display, the top cover, the light guide plate and the back frame are assembled together to assemble the housing of the liquid crystal device, and these metal top cover, light guide plate and back frame are compressed when the backlight temperature rises, so that it is necessary to form the four corner regions which are discontinuous due to the beveling, the discontinuous boundaries and are spaced apart by a certain distance, so that light leaks to the outside through the spaced apart spaces when the LCD device is assembled, the display quality of the LCD display is reduced, and improvement is required.

Disclosure of Invention

This application provides a backlight unit and display device according to prior art problem, can solve four edges and corners regions of backlight unit's back frame among the prior art and cause its discontinuity owing to cut obliquely, and discontinuous border is and separate and have a certain distance, so when the equipment LCD device, light can pass through the spaced space and leak to the outside, has reduced the technical problem of LCD device's display quality.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the embodiment of the invention provides a backlight module, which comprises a back frame, a light guide plate and an optical film layer, wherein the light guide plate is positioned in the back frame; the back frame comprises a bottom plate and side plates bent along the edge of the bottom plate, gaps are reserved between the adjacent side plates in the area of four corners of the back frame, and elastic shading layers are arranged in the gaps.

According to a preferred embodiment of the present invention, the light shielding layer is made of a rubber block, silica gel, or a light shielding high molecular polymer.

According to a preferred embodiment of the present invention, the light shielding layer includes a right-angled portion, the right-angled portion is located on a side of the side plate facing the light guide plate, and the right-angled portion is used for shielding the gap.

According to a preferred embodiment of the present invention, the light shielding layer further includes an arc portion located outside the right-angle portion, the arc portion is clamped in the gap, and the shape of the arc portion is the same as the outer contour shape of the back frame corner edge.

According to a preferred embodiment of the present invention, the right angle portion and the circular arc portion are integrally formed, and the right angle portion is further used for limiting the displacement of the light guide plate.

According to a preferred embodiment of the present invention, a fixing connector is further disposed between the back frame and the light guide plate, the fixing connector is in a groove shape, the light guide plate is clamped in the groove, and the fixing connector is made of a transparent material.

According to a preferred embodiment of the present invention, the fixing connector includes a bottom portion and bent portions at both sides of the bottom portion, and the cross-sectional shape of the bent portions is a right-angle shape.

According to a preferred embodiment of the present invention, the backlight module further includes a light source substrate, a notch is formed in a side of the light guide plate close to the light source substrate to avoid the light source substrate, the side plate is a flat plate, the light source substrate is bonded to the side plate through a heat conducting adhesive, and the light guide plate converts a horizontal light emitted from the light source substrate into a vertical light.

According to a preferred embodiment of the present invention, in the light emitting direction of the backlight module, one end of the light shielding layer is flush with the bottom plate, and the other end of the light shielding layer is flush with the optical film layer.

According to the backlight module of the above embodiment, the present invention further provides a display device, which includes the backlight module in the above embodiment, a liquid crystal panel located on the surface of the backlight module, and a protective cover plate located on the surface of the liquid crystal panel, wherein an annular middle frame is disposed on one side of the backlight module and the liquid crystal panel, an annular top cover is disposed on the opposite side of the backlight module and the liquid crystal panel, and the annular middle frame and the annular top cover are used for fixing the liquid crystal panel.

The invention has the beneficial effects that: the embodiment of the invention provides a backlight module and a display device, wherein the backlight module comprises a back frame, a light guide plate positioned in the back frame and an optical film layer positioned on the light guide plate; the back frame comprises a bottom plate and side plates bent along the edge of the bottom plate, gaps exist between adjacent side faces due to beveling in the areas of four corners of the back frame, and light shielding layers are arranged in the gaps; according to the backlight module, the light guide plate, the optical film layer and the back frame form separation spaces, the separation spaces are distributed on the edges of the four corners of the backlight module, and the separation spaces are filled with the elastic shading materials, so that light leakage of the backlight module on the four corners of the edges can be effectively avoided, and the light emitting efficiency of the backlight module is improved.

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 invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a back frame structure of a backlight module according to the present invention.

Fig. 2 is a schematic view of a top view structure of a light-shielding layer of a backlight module according to the present invention.

FIG. 3 is a schematic top view of another light-shielding layer of a backlight module according to the present invention.

FIG. 4 is a schematic cross-sectional view A1-A2 of FIG. 3.

FIG. 5 is a schematic cross-sectional view of B1-B2 shown in FIG. 3.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals, and broken lines in the drawings indicate that the elements do not exist in the structures, and only the shapes and positions of the structures are explained.

The present invention is directed to the technical problem that the display quality of the LCD device is reduced because the light leaks to the outside through the separated space when the LCD device is assembled because the four corner regions of the back frame of the backlight module in the prior art are discontinuous due to the beveling, the discontinuous boundaries are separated and have a certain distance, and the implementation can overcome the technical defects described above.

In order to solve the above technical problems, an embodiment of the present invention provides a backlight module, which includes a back frame, a light guide plate located in the back frame, and an optical film layer located on the light guide plate; the back frame comprises a bottom plate and side plates bent along the edge of the bottom plate, reserved gaps exist between the adjacent side plates due to beveling in the areas of four corners of the back frame, and elastic shading layers are arranged in the gaps; according to the backlight module, the light guide plate, the optical film layer and the back frame form separation spaces due to the reserved gaps, the separation spaces are distributed on the edges of the four corners of the backlight module, and the separation spaces are filled with the elastic shading materials, so that light leakage of the backlight module on the four corners of the edges can be effectively avoided, and the light emitting efficiency of the backlight module is improved.

Through the improvement of the structure, the invention can only increase one structural change on the premise of ensuring that the overall structure of the backlight module is not influenced, and simultaneously can reasonably avoid the problem of light leakage at the corners, thereby realizing better effect, solving the problems in the production of the liquid crystal display device at present, not only keeping the original structural characteristics of the product, but also solving the problem of light leakage at the corners, providing a technical basis to a certain degree for improving the quality of the liquid crystal display device, and realizing the reliability and the practicability of the liquid crystal display device.

Specifically, as shown in fig. 1, the back frame 10 of the backlight module includes a bottom plate 11 and side plates bent along edges of the bottom plate, such as a side plate 12, a side plate 13, a side plate 14 and a side plate 15, two adjacent side plates of the side plate 12, the side plate 13, the side plate 14 and the side plate 15 are chamfered during the manufacturing process and then bent to form a structure having a receiving cavity, an optical element is placed in the receiving cavity, and naturally, a reserved gap exists between the adjacent side surfaces due to the chamfering at the area of four corners of the back frame, and the gap can be clearly seen in fig. 1.

As shown in fig. 2, in order to avoid light leakage from the gap, the invention arranges elastic light shielding layers on the gap, the gap is positioned at four corners of the backlight module 50, a first light shielding layer 21 is arranged between the side plate 12 and the side plate 13, a second light shielding layer 22 is arranged between the side plate 13 and the side plate 14, a third light shielding layer 23 is arranged between the side plate 14 and the side plate 15, a fourth light shielding layer 24 is arranged between the side plate 15 and the side plate 12, the first light shielding layer 21, the second light shielding layer 22, the third light shielding layer 23 and the fourth light shielding layer 24 are all in a right-angled structure, and are positioned on one side of the side surface facing the light guide plate 25, and are mainly used for shielding the gap, preventing light leakage and fixing displacement of the light guide plate. In addition, all the light shielding layers are made of rubber blocks, silica gel or light shielding high molecular polymers.

Fig. 3 is a further improvement of fig. 2, and as shown in fig. 3, the light shielding layer of the present embodiment includes a right-angle portion and an arc portion located outside the right-angle portion, the arc portion is clamped in the gap, and the shape of the arc portion is the same as the outer contour shape of the back frame corner. For example, a first light shielding layer 31 is provided between the side plate 12 and the side plate 13, a second light shielding layer 32 is provided between the side plate 13 and the side plate 14, a third light shielding layer 33 is provided between the side plate 14 and the side plate 15, a fourth light shielding layer 34 is provided between the side plate 15 and the side plate 12, the first light shielding layer 31, the second light shielding layer 32, the third light shielding layer 33, and the fourth light shielding layer 34 are all composite structures of a right-angle structure and an arc structure, and the right-angle portion and the arc portion are preferably integrally molded. In addition, all the light shielding layers are made of rubber blocks, silica gel or light shielding high molecular polymers.

The following are noted: FIG. 4 is a schematic diagram of a cross-sectional structure A1-A2 in FIG. 3, and FIG. 5 is a schematic diagram of a cross-sectional structure B1-B2 in FIG. 3; in order to show the film layer schematic diagram of the whole display device, the inventor adds the liquid crystal panel film layer and the position schematic diagram in fig. 4 and fig. 5, but does not influence the structural description of the backlight module.

As shown in fig. 4, a1-a2 of the present embodiment is cut transversely along adjacent corners, a first light shielding layer 31 and a second light shielding layer 32 are disposed at the edges of the corners, the backlight module includes a back frame, the back frame includes a bottom plate 11 and side plates, the bottom plate 11 and the side plates form a receiving cavity, wherein the side plates of the present embodiment include side plates 12 and side plates 14; the optical element and the light element in the back frame of the backlight module comprise a fixed connecting piece 35 positioned on the bottom plate 11 of the back frame, the fixed connecting piece 35 is in a groove shape, the reflecting plate 36 and the light guide plate 25 are clamped in the groove, the fixed structure 35 is made of transparent materials, the emergent light is not influenced, and the fixed connecting piece 35 is preferably optical glue or square glue. Fixed connector 35 includes the bottom and is located the kink of bottom both sides, and the cross sectional shape of kink is right angle shape, and one of them limit overlap joint of right angle shape is provided with the optics rete on the edge of light guide plate 25 above light guide plate 25, and the optics rete includes diffuser plate 37, prism piece 38 and brightness enhancement film 39. In the light-emitting direction of the backlight module 50, one end of the first light-shielding layer 31 and one end of the second light-shielding layer 32 are flush with the bottom plate 11, and the other end of the first light-shielding layer is flush with the optical film layer, so that the whole gap is conveniently shielded, and the backlight module 50 is prevented from leaking light at four corners at the edge, thereby improving the light-emitting efficiency of the backlight module 50. The backlight module in this embodiment further includes a middle frame and a top cover, which are used for fixing a liquid crystal panel above the backlight module, and the liquid crystal panel includes an array substrate 42, a color film substrate 44, and a liquid crystal layer 43 located between the array substrate 42 and the color film substrate 44; such as a right side center frame 41, a left side center frame 42, a right side top cover 45, and a left side top cover 46.

As shown in fig. 5, a1-a2 of the present embodiment is cut along the center line of the adjacent backlight module, and the backlight module includes: the back frame comprises a bottom plate 11 and side plates, wherein the bottom plate 11 and the side plates form an accommodating cavity, and the side plates of the embodiment comprise side plates 15 and side plates 13; a fixed connecting member 35; a reflection plate 36 located above the bottom plate 11 for reflecting light leaking from the containing chamber back again; a light guide plate 25; the light source comprises a light source substrate 47, wherein a notch avoiding the light source substrate is formed in one side, close to the light source substrate 47, of the light guide plate 25, the side plate 15 is a flat plate, the light source substrate 47 is bonded to the side plate 15 through heat conducting glue, and the light guide plate 25 converts horizontal light rays emitted by the light source substrate into vertical light rays; optical film layers including a diffusion plate 37, a prism sheet 38, and a brightness enhancement film 39; the diffusion plate 37 is used to make the incident light from the light guide plate 25 undergo multiple refraction, reflection, and scattering, so that the incident point light source is converted into a surface light source, and the light source is sufficiently scattered, thereby achieving softer and more uniform light source. The prism sheet 38 and the brightness enhancement film 39 are used for gathering the divergent light emitted by the diffusion plate 37 in a preset range and emitting the divergent light, and improving the brightness of the backlight module 50; the prism sheet 38 is a light condensing device, and concentrates the dispersed light to a certain angle range for emission by using the law of total reflection and refraction, thereby increasing the brightness in the emission range and increasing the brightness of the backlight module by 50 degrees. The backlight module in this embodiment further includes a middle frame and a top cover, which are used for fixing a liquid crystal panel above the backlight module, and the liquid crystal panel includes an array substrate 42, a color film substrate 44, and a liquid crystal layer 43 located between the array substrate 42 and the color film substrate 44; such as a right side center frame 41, a left side center frame 42, a right side top cover 45, and a left side top cover 46.

According to the backlight module of the above embodiment, the present invention further provides a display device, which includes the backlight module of the above embodiment, a liquid crystal panel located on the surface of the backlight module, and a protective cover plate located on the surface of the liquid crystal panel, wherein an annular middle frame is disposed on one side of the backlight module and the liquid crystal panel, an annular top cover is disposed on the opposite side of the backlight module and the liquid crystal panel, and the annular middle frame and the annular top cover are used for fixing the liquid crystal panel. Referring to fig. 4 and 5, the liquid crystal panel includes an array substrate 42, a color filter substrate 44, and a liquid crystal layer 43 located between the array substrate 42 and the color filter substrate 44, in the film cross-sectional structure, the middle frame includes a right middle frame 41 and a left middle frame 42, and the top cover includes a right top cover 45 and a left top cover 46.

The embodiment of the invention provides a backlight module and a display device, wherein the backlight module comprises a back frame, a light guide plate positioned in the back frame and an optical film layer positioned on the light guide plate; the back frame comprises a bottom plate and side plates bent along the edge of the bottom plate, reserved gaps exist between adjacent side faces due to beveling in the areas of four corners of the back frame, and light shielding layers are arranged in the gaps; according to the backlight module, the light guide plate, the optical film layer and the back frame form separation spaces due to the reserved gaps, the separation spaces are distributed on the edges of the four corners of the backlight module, and the separation spaces are filled with the elastic shading materials, so that light leakage of the backlight module on the four corners of the edges can be effectively avoided, and the light emitting efficiency of the backlight module is improved.

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

Claims

1. A backlight module is characterized by comprising a back frame, a light guide plate positioned in the back frame and an optical film layer positioned on the light guide plate; the back frame comprises a bottom plate and side plates bent along the edge of the bottom plate, gaps are reserved between the adjacent side plates in the area of four corners of the back frame, and elastic shading layers are arranged in the gaps.

2. The backlight module as claimed in claim 1, wherein the light-shielding layer is made of rubber, silica gel or light-shielding high polymer.

3. A backlight module according to claim 1, wherein the light shielding layer comprises a right-angled portion at a side of the side plate facing the light guide plate, the right-angled portion being configured to shield the gap.

4. The backlight module as claimed in claim 3, wherein the light-shielding layer further includes an arc portion located outside the right-angle portion, the arc portion is held in the gap, and the arc portion has a shape identical to an outer contour shape of the corner edge of the back frame.

5. A backlight module according to claim 4, wherein the right angle part and the circular arc part are integrally formed, and the right angle part is further used for limiting the displacement of the light guide plate.

6. The backlight module as claimed in claim 1, wherein a fixing connector is further disposed between the back frame and the light guide plate, the fixing connector is in the shape of a groove, the light guide plate is clamped in the groove, and the fixing connector is made of a transparent material.

7. The backlight module according to claim 6, wherein the fixing connector comprises a bottom portion and a bent portion at two sides of the bottom portion, and the cross-sectional shape of the bent portion is a right-angle shape.

8. The backlight module as claimed in claim 1, wherein the backlight module further comprises a light source substrate, a side of the light guide plate adjacent to the light source substrate is provided with a notch avoiding the light source substrate, the side plate is a flat plate, the light source substrate is bonded to the side plate by a heat conductive adhesive, and the light guide plate converts horizontal light emitted from the light source substrate into vertical light.

9. The backlight module as claimed in claim 8, wherein the light shielding layer has one end flush with the bottom plate and the other end flush with the optical film layer in a light emitting direction of the backlight module.

10. A display device, comprising the backlight module according to any one of claims 1 to 9, a liquid crystal panel disposed on a surface of the backlight module, and a protective cover disposed on a surface of the liquid crystal panel, wherein an annular middle frame is disposed on a side of the backlight module opposite to the liquid crystal panel, and an annular top cover is disposed on a side of the backlight module opposite to the liquid crystal panel, and the annular middle frame and the annular top cover are used for fixing the liquid crystal panel.