CN114791682A - Backlight module and liquid crystal display device - Google Patents

Backlight module and liquid crystal display device Download PDF

Info

Publication number
CN114791682A
CN114791682A CN202110097290.6A CN202110097290A CN114791682A CN 114791682 A CN114791682 A CN 114791682A CN 202110097290 A CN202110097290 A CN 202110097290A CN 114791682 A CN114791682 A CN 114791682A
Authority
CN
China
Prior art keywords
frame
light
circuit board
backlight module
back plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110097290.6A
Other languages
Chinese (zh)
Inventor
李文洋
韩锐
崔栋
董唱
冷寿阳
王丰平
谭蕊
宋彬新
迟卫宁
翟跃
张志鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Beijing BOE Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd, Beijing BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202110097290.6A priority Critical patent/CN114791682A/en
Publication of CN114791682A publication Critical patent/CN114791682A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention belongs to the technical field of display, and particularly relates to a backlight module and a liquid crystal display device. The backlight module in the liquid crystal display device comprises a back plate, a middle frame and a light shading piece, wherein the back plate is provided with a first frame forming a closed loop, the middle frame is provided with a second frame forming the closed loop, the first frame is clamped in the second frame, the corners of the first frame and the second frame are provided with notches, the light shading piece and the notches of the first frame are arranged in a one-to-one correspondence mode, and the light shading piece shields the notches of the first frame of the corresponding back plate. The light shading piece is matched with the first frame of the back plate to seal the light guide plate in the back plate, so that the phenomenon that light leaks out from the corner position of the back plate can be improved to meet the use requirement, and the light shading piece is simple to operate and has good practical value.

Description

Backlight module and liquid crystal display device
Technical Field
The invention belongs to the technical field of display, and particularly relates to a backlight module and a liquid crystal display device.
Background
With the popularization of liquid crystal displays, liquid crystal display devices in the prior art display more and more application information, and accordingly, the requirements on the quality of the liquid crystal display devices are higher and higher. For example, in-vehicle liquid crystal displays applied to liquid crystal instrument panels and center controls of automobiles, the requirements for light leakage and poor functionality of the liquid crystal display are more severe in view of safety.
In the prior art, the liquid crystal display device comprises an outer frame, a middle frame and a back plate which are sequentially arranged from the front to the back, and after the outer frame, the middle frame and the back plate are assembled, light leaks from the corners of the back plate, so that the use requirement cannot be met.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a backlight module and a liquid crystal display device, and aims to solve the technical problem that after the liquid crystal display device in the prior art is assembled, light leaks from the corners of a back plate, and the use requirement cannot be met.
The technical scheme of the invention is as follows:
in one aspect, the invention provides a backlight module, which includes a back plate and a middle frame, wherein the back plate has a first frame forming a closed loop, the middle frame has a second frame forming a closed loop, the first frame is clamped in the second frame, and corners of the first frame and the second frame are provided with notches;
the backlight module further comprises a light shading part, the light shading part and the notch of the first frame are arranged in a one-to-one correspondence mode, and the light shading part shields the corresponding notch of the first frame of the back plate.
Further, the shading piece is a shading adhesive tape.
Furthermore, the shading adhesive tape is adhered to the corresponding notch of the first frame of the back plate.
Preferably, the light-shielding tape is black.
Further, the back plate also comprises a bottom plate, and the first frame is arranged on the edge of the front surface of the bottom plate;
the middle frame further comprises a surrounding plate, the surrounding plate and the bottom plate are arranged oppositely, and the second frame is arranged on the edge of the back face of the surrounding plate;
the backlight module further comprises an optical assembly, the optical assembly comprises a reflecting plate, a light guide plate and an optical diaphragm, and the reflecting plate, the light guide plate and the optical diaphragm are sequentially arranged on the bottom plate and between the enclosing plates in the direction from the bottom plate to the enclosing plates.
Furthermore, the backlight module further comprises a light wire and a light bar circuit board, the light bar circuit board is attached to the inner side of the first frame, the light wire is arranged inside the first frame, one end of the light wire penetrates through the light bar circuit board, and one end of the light wire is welded to the outer side of the light bar circuit board;
be provided with on the first frame and dodge the breach, lamp strip circuit board is used for the welding the position setting of lamp cord is in dodge breach department.
Furthermore, an insulating part is arranged at the position of the avoidance notch on the first frame.
On the other hand, the invention also provides a liquid crystal display device which comprises an outer frame and the backlight module, wherein the outer frame, the middle frame and the back plate are sequentially arranged along the same direction.
Further, the outer frame has a third rim forming a closed loop, and the second rim is disposed inside the third rim;
the liquid crystal display device further comprises a flexible circuit board, the flexible circuit board is arranged between the third frame and the second frame, a recess is formed in the position where the flexible circuit board is installed on the second frame, and the flexible circuit board is arranged in the recess.
Further, a buffer is arranged on the surface of the concave part of the second frame.
The beneficial effects of the invention are:
the invention provides a liquid crystal display device, which comprises a backlight module, wherein a backboard of the backlight module is provided with a first frame forming a closed loop, a middle frame is provided with a second frame forming the closed loop, the first frame is clamped in the second frame, and the corners of the first frame and the second frame are provided with notches.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained according to the embodiments of the drawings without creative efforts.
FIG. 1 is a schematic view of a liquid crystal display device according to an embodiment of the present invention;
FIG. 2 is a schematic view of an assembly of a corner position of a back plate of the LCD device in FIG. 1;
FIG. 3 is a schematic view of the assembly of the light bar circuit board and the back plate of the LCD device of FIG. 1;
fig. 4 is a schematic view illustrating an assembly structure of a flexible circuit board of the liquid crystal display device of fig. 1.
In the drawings: 1-a back plate, 101-a first frame, 102-a bottom plate, 103-a notch, 104-an avoidance notch, 105-a welding point, 2-a middle frame, 201-a second frame, 202-a surrounding plate, 3-a shading adhesive tape, 4-a lamp strip circuit board, 5-a flexible circuit board, 6-an outer frame, 601-a third frame, 602-a top plate, 7-a recess, 8-an insulating part, 9-a liquid crystal panel, 10-a reflecting plate, 11-a light guide plate, 12-an optical membrane, 1201-a diffusion membrane, 1202-a first light enhancement membrane, 1203-a second light enhancement membrane and 13-foam.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that the terms "mounted," "connected" and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected or integrally connected unless otherwise explicitly stated or limited; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. To simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the invention. In addition, while embodiments of the invention provide examples of various specific processes and materials, one of ordinary skill in the art will recognize applications of other processes and/or uses of other materials. It should be noted that, in the case of no conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention, and with reference to fig. 1, the liquid crystal display device according to the embodiment of the present invention includes an outer frame 6, a middle frame 2, and a back plate 1, which are sequentially disposed from a front surface to a back surface thereof, and further includes a backlight source (not shown in the figure) disposed at a back of the back plate 1, an optical assembly disposed between the back plate 1 and the middle frame 2, and a liquid crystal panel 9 disposed between the middle frame 2 and the outer frame 6. The light emitted by the backlight source is emitted after the reflection, scattering, diffusion and other actions of the optical component so as to be provided for the liquid crystal panel, so that the liquid crystal panel can realize the display function.
In the prior art, the middle frame 2 is mostly a rubber frame, and the wall thickness of the rubber frame is generally 0.8 mm. In order to reduce the frame thickness of the liquid crystal display device, the applicant replaces the rubber frame with the iron frame, and can reduce the wall thickness of the middle frame to 0.3mm, but the iron frame is used to replace the rubber frame, and the following technical problems can be met:
the rubber frame is formed by an injection molding process, the corners of the rubber frame are closed, the back plate is formed by a sheet metal part through a stamping process, process notches are formed in the corners of the back plate, and after the rubber frame is clamped on the back plate, the rubber frame can just shield the notches in the corners of the back plate to prevent light leakage. However, after replacing the rubber frame with the iron frame, because the iron frame is also by sheet metal component stamping process shaping, so there is the technology breach in the corner of iron frame also, after iron frame and backplate block, there is light to spill the corner position of backplate, because the whole shape of backplate and center is mostly square, consequently, after iron frame and backplate block, can have light to expose in four corners of backplate department, can not satisfy operation requirement.
Based on this, the applicant provides a backlight module to solve the problem of light leakage.
Fig. 2 is an assembly view of a corner position of a back plate of the lcd device in fig. 1. With reference to fig. 1 and fig. 2, the backlight module provided in the embodiment of the invention includes a back plate 1, a middle frame 2 and a light shielding member 3, the back plate 1 has a first frame 101 forming a closed loop, the middle frame 2 has a second frame 201 forming a closed loop, the first frame 101 is clamped in the second frame 201, corners of the first frame 101 and the second frame 201 both have a notch, and fig. 2 only shows one notch 103 on the first frame 101. For a display panel with a generally square shape, the back plate 1 and the middle frame 2 correspond to a square shape, and therefore, notches are formed at four corners of the square shape of the back plate 1 and the middle frame 2. Of course, the display panel according to the embodiment of the present invention may have other shapes, and the shape of the display panel is not limited in the embodiment of the present invention as long as the display panel is applicable to the present invention.
Referring to fig. 2, the light-shielding members 3 of the embodiment of the present invention are disposed corresponding to the notches 103 of the first frames 101 one by one, and the light-shielding members 3 shield the corresponding notches 103 of the first frames 101 of the back plate 1, so that the light-shielding members 3 are matched with the first frames 101 of the back plate 1 to seal the light guide plate in the back plate 1, thereby improving the occurrence of light leakage at the corners of the back plate 1 to meet the use requirements. It will be understood by those skilled in the art that the number of shades 3 required corresponds to the number of indentations 103 of the back plate 1.
Specifically, in the embodiment of the present invention, the light shielding member 3 is preferably a light shielding tape, which can be disposed at the corresponding notch 103 of the first frame 101 of the back plate 1 in an adhesive manner, so that the operation is simple, convenient and fast. It will be understood by those skilled in the art that the light shielding member 3 may also be other devices capable of providing a light shielding effect, for example, it may be a light shielding aluminum alloy foil, a light shielding film, a light shielding paper, a light shielding cloth, etc., and the embodiment of the present invention is not limited thereto. In addition, fig. 2 shows that the light shielding member 3 is located inside the notch 3, alternatively, the light shielding member 3 may also be located outside the notch 3 or on the notch 3, as long as the light shielding member can shield the notch 3 to prevent light leakage, which is not limited in this embodiment of the present invention.
The light-shielding tape in the embodiment of the present invention is preferably black, but it may also be other colors, such as other non-transparent colors, as long as it can prevent light leakage at the corner position of the back plate 1, and this is not limited in the embodiment of the present invention.
Referring to fig. 1, the back panel 1 of the embodiment of the present invention further includes a bottom panel 102, the first rim 101 is disposed on the edge of the front surface of the bottom panel 102, so that the back panel 1 is substantially L-shaped, and the middle frame 2 further includes a surrounding panel 202, the surrounding panel 202 is disposed opposite to the bottom panel 102, and the surrounding panel 202 is substantially hollow and ring-shaped. The second bezel 201 is provided on the edge of the back surface of the enclosure 202, making the middle frame 2 substantially L-shaped. In addition, the optical assembly according to the embodiment of the present invention includes the reflective plate 10, the light guide plate 11, and the optical film 12, and the reflective plate 10, the light guide plate 11, and the optical film 12 are sequentially disposed between the bottom plate 102 and the surrounding plate 202 in a direction from the bottom plate 102 to the surrounding plate 202.
Further, the optical film 12 according to the embodiment of the present invention may be a diffusion film 1201, a first bright enhancement film 1202, and a second bright enhancement film 1203 that are sequentially disposed from the bottom plate 102 to the direction of the surrounding plate 202, which is the prior art, and details of the embodiment of the present invention are not described herein.
In addition, the applicant also found in actual operation that: backlight module's backlight adopts lamp strip Circuit Board (Printed Circuit Board, shortly for PCB) and lamp line welded scheme, because lamp strip Circuit Board is the laminating and sets up the inboard at backplate 1's first frame 101, the lamp line passes lamp strip Circuit Board to weld in the outside of lamp strip Circuit Board, at the welding department of lamp strip Circuit Board and lamp line, the lamp line has the risk of short Circuit with backplate 1 contact.
Fig. 3 is an assembly diagram of the light bar circuit board and the back plate of the liquid crystal display device in fig. 1. With reference to fig. 3, the backlight module in the embodiment of the present invention further includes a light wire (not shown in the drawing) and a light bar circuit board 4, the light bar circuit board 4 is disposed on the inner side of the first frame 101 of the back plate 1, the light wire is disposed inside the first frame 101, one end of the light wire penetrates through the light bar circuit board 4, one end of the light wire is welded on the outer side of the light bar circuit board 4 to form a welding point 105, the first frame 101 of the back plate 1 is provided with an avoiding notch 104, and a portion of the light bar circuit board 4 for welding the light wire (i.e., the welding point 105) is disposed at the avoiding notch 104, so as to avoid a short circuit phenomenon caused by the light wire contacting the back plate 1.
Specifically, in the embodiment of the present invention, the light wire may be mounted on the first side frame 101 or the bottom plate 102 in an adhering or clamping manner, so that the light wire is fixed, and the light wire is prevented from shaking during use, so as to improve the welding firmness of the light wire and the light bar circuit board 4. One end of the lamp wire can penetrate through the lamp strip circuit board 4 and is welded at the outer side of the lamp strip circuit board 4, and after welding, glue dispensing protection can be carried out at the welding position of the lamp strip circuit board 4 and the lamp wire, so that the functions of fixing, insulating and enhancing the strength of the welding position are achieved.
Further, in the embodiment of the present invention, the insulation member 8 may be disposed at the position of the first frame 101 of the back plate 1, where the gap 104 is avoided, and the insulation member 8 is disposed on the surface of the gap 104, so as to further improve the insulation effect and effectively prevent the short circuit of the lamp line at the welding position. Specifically, in the embodiment of the present invention, the insulating member 8 may be an insulating tape which is adhered to the surface of the avoiding gap 104, and of course, the insulating member 8 may also be an insulating paint which is sprayed on the surface of the avoiding gap 104, which is not limited in the embodiment of the present invention.
Referring to fig. 1, in a liquid crystal display device according to an embodiment of the present invention, an outer frame 6 includes a top plate 602 and a third frame 601 forming a closed loop, the top plate 602 and the bottom plate 102 are respectively disposed on two sides of a surrounding plate 202, the third frame 601 is disposed on a back edge of the top plate 602, so that the outer frame 6 is substantially L-shaped as a whole, a second frame 201 is disposed inside the third frame 601, and a Flexible Printed Circuit (FPC) (not shown) is disposed between the second frame 201 and the third frame 601.
The applicant also found in practice that: because the middle frame is formed by a sheet metal part stamping process, burrs and burrs left at the edge of the middle frame (namely the connecting transition part of the coaming 202 and the second frame 201) during punching can be generated, the middle frame adopting the iron frame structure can easily scratch the flexible circuit board at the bent part of the middle frame.
Fig. 4 is a schematic view showing an assembly structure of the flexible circuit board of the liquid crystal display device in fig. 1, and referring to fig. 4, the flexible circuit board 5 according to the embodiment of the present invention is disposed between the third frame 601 of the outer frame 6 and the second frame 201 of the middle frame 2, the second frame 201 is provided with a recess 7 at a position where the flexible circuit board 5 is mounted, namely, the second frame 201 of the middle frame 2 is processed with concave processing at the position where the flexible circuit board 5 is installed, the flexible circuit board 5 is arranged at the concave 7, thus, the installation space of the flexible circuit board 5 can be enlarged, the direct contact between the bending part of the middle frame 2 and the flexible circuit board 5 can be avoided, the scratching phenomenon of the flexible circuit board 5 can be improved, meanwhile, the gap between the second frame 202 of the middle frame 2 and the first frame 101 of the back plate 1 can be reduced, the tight fit between the middle frame 2 and the back plate 1 is increased, the looseness and abnormal sound are prevented, and the practicability is good.
The recess 7 of the embodiment of the present invention may be trapezoidal, and a buffer is disposed on the surface of the recess 7 of the second frame 202 of the middle frame 2, so as to prevent the flexible circuit board 5 from colliding with the second frame 202 when the flexible circuit board 5 is loosened, and the flexible circuit board 5 is scratched.
Further, the buffer member in the embodiment of the present invention may be an insulating tape, and may also be other members having a buffering function, for example, foam, and the like.
Referring to fig. 1, in the embodiment of the present invention, the liquid crystal panel 9 is assembled between the top plate 602 and the enclosure 202, and the foam 13 may be filled between the liquid crystal panel 9 and the enclosure 202 to improve the assembling firmness of the liquid crystal panel 9. The liquid crystal display device may also include other components and structures known in the art and will not be described in detail herein.
The liquid crystal display device is particularly suitable for being applied to the vehicle-mounted liquid crystal display screen which has high requirements on safety, particularly has more severe requirements on poor functions such as light leakage, short circuit and the like; in addition, the problem of short circuit of the lamp wires can be solved through the avoidance notch arranged on the back plate in the backlight module, and the liquid crystal display device is prevented from having poor functions; in addition, the depression for mounting the flexible printed circuit board is arranged on the middle frame, so that the problem that the flexible printed circuit board is easily scratched by the middle frame can be solved, the liquid crystal display device provided by the embodiment of the invention can particularly well meet the vehicle-mounted display requirement, and the driving safety is greatly improved. Meanwhile, the iron frame is used for replacing the rubber frame, so that the frame thickness of the liquid crystal display device is reduced, the requirement that the current liquid crystal display device is increasingly thinned is met, and the frame strength of the vehicle-mounted liquid crystal display device is improved.
The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and it should be understood that those skilled in the art can make partial changes or modifications to the disclosed technical content without departing from the technical scope of the present invention, and the technical scope of the present invention is also within the technical scope of the present invention.

Claims (10)

1. A backlight module is characterized by comprising a back plate and a middle frame, wherein the back plate is provided with a first frame forming a closed loop, the middle frame is provided with a second frame forming the closed loop, the first frame is clamped in the second frame, and corners of the first frame and the second frame are provided with notches;
the backlight module further comprises a light shading part, the light shading part and the notch of the first frame are arranged in a one-to-one correspondence mode, and the light shading part shields the corresponding notch of the first frame of the back plate.
2. The backlight module as claimed in claim 1, wherein the light shielding member is a light shielding tape.
3. The backlight module according to claim 2, wherein the light shielding tape is adhered to the corresponding notch of the first bezel of the back plate.
4. The backlight module according to claim 2, wherein the light shielding tape is black.
5. The backlight module according to claim 1, wherein the back plate further comprises a bottom plate, and the first frame is disposed on an edge of a front surface of the bottom plate;
the middle frame further comprises a surrounding plate, the surrounding plate and the bottom plate are arranged oppositely, and the second frame is arranged on the edge of the back face of the surrounding plate;
the backlight module further comprises an optical assembly, the optical assembly comprises a reflecting plate, a light guide plate and an optical diaphragm, and the reflecting plate, the light guide plate and the optical diaphragm are sequentially arranged between the bottom plate and the enclosing plates in the direction from the bottom plate to the enclosing plates.
6. The backlight module according to any one of claims 1 to 5, further comprising a light strip and a light strip circuit board, wherein the light strip circuit board is attached to the inner side of the first frame, the light strip is disposed inside the first frame, one end of the light strip passes through the light strip circuit board, and one end of the light strip is welded to the outer side of the light strip circuit board;
be provided with on the first frame and dodge the breach, lamp strip circuit board is used for the welding the position setting of lamp cord is in dodge breach department.
7. A backlight module according to claim 6, wherein an insulator is disposed at the relief notch on the first frame.
8. A liquid crystal display device, comprising an outer frame and the backlight module of any one of claims 1 to 7, wherein the outer frame, the middle frame and the back plate are sequentially arranged along the same direction.
9. The liquid crystal display device according to claim 8, wherein the outer frame has a third bezel forming a closed loop, and the second bezel is disposed inside the third bezel;
the liquid crystal display device further comprises a flexible circuit board, the flexible circuit board is arranged between the third frame and the second frame, a recess is formed in the position, where the flexible circuit board is installed, of the second frame, and the flexible circuit board is arranged in the recess.
10. The liquid crystal display device according to claim 9, wherein a buffer is provided on a surface of the recess of the second bezel.
CN202110097290.6A 2021-01-25 2021-01-25 Backlight module and liquid crystal display device Pending CN114791682A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110097290.6A CN114791682A (en) 2021-01-25 2021-01-25 Backlight module and liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110097290.6A CN114791682A (en) 2021-01-25 2021-01-25 Backlight module and liquid crystal display device

Publications (1)

Publication Number Publication Date
CN114791682A true CN114791682A (en) 2022-07-26

Family

ID=82459770

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110097290.6A Pending CN114791682A (en) 2021-01-25 2021-01-25 Backlight module and liquid crystal display device

Country Status (1)

Country Link
CN (1) CN114791682A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115951516A (en) * 2022-12-08 2023-04-11 业成科技（成都）有限公司 Backlight module and display device

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102608778A (en) * 2011-12-14 2012-07-25 友达光电股份有限公司 Liquid crystal display device with a light guide plate
US20140071374A1 (en) * 2012-09-11 2014-03-13 Shenzhen China Star Optoelectronics Technology Co., Ltd. Liquid Crystal Display Device
CN104865733A (en) * 2015-06-01 2015-08-26 青岛海信电器股份有限公司 Gasket used for shading module corner, module and display device
CN105652522A (en) * 2016-04-12 2016-06-08 京东方科技集团股份有限公司 Backlight module and manufacturing method thereof, back board and display device
CN105842919A (en) * 2016-04-25 2016-08-10 乐视控股（北京）有限公司 Backlight unit, display module and display equipment
CN107065298A (en) * 2016-12-22 2017-08-18 武汉华星光电技术有限公司 Backlight module and liquid crystal display
CN207396913U (en) * 2017-09-22 2018-05-22 东莞鸿能海电子制品有限公司 A kind of liquid crystal display die set
CN208107848U (en) * 2018-05-23 2018-11-16 信利半导体有限公司 A kind of backlight module
CN109375403A (en) * 2018-11-07 2019-02-22 惠州市华星光电技术有限公司 Narrow frame display device and preparation method
CN110579906A (en) * 2019-09-19 2019-12-17 京东方科技集团股份有限公司 Backlight module and display device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102608778A (en) * 2011-12-14 2012-07-25 友达光电股份有限公司 Liquid crystal display device with a light guide plate
US20140071374A1 (en) * 2012-09-11 2014-03-13 Shenzhen China Star Optoelectronics Technology Co., Ltd. Liquid Crystal Display Device
CN104865733A (en) * 2015-06-01 2015-08-26 青岛海信电器股份有限公司 Gasket used for shading module corner, module and display device
CN105652522A (en) * 2016-04-12 2016-06-08 京东方科技集团股份有限公司 Backlight module and manufacturing method thereof, back board and display device
CN105842919A (en) * 2016-04-25 2016-08-10 乐视控股（北京）有限公司 Backlight unit, display module and display equipment
CN107065298A (en) * 2016-12-22 2017-08-18 武汉华星光电技术有限公司 Backlight module and liquid crystal display
CN207396913U (en) * 2017-09-22 2018-05-22 东莞鸿能海电子制品有限公司 A kind of liquid crystal display die set
CN208107848U (en) * 2018-05-23 2018-11-16 信利半导体有限公司 A kind of backlight module
CN109375403A (en) * 2018-11-07 2019-02-22 惠州市华星光电技术有限公司 Narrow frame display device and preparation method
CN110579906A (en) * 2019-09-19 2019-12-17 京东方科技集团股份有限公司 Backlight module and display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115951516A (en) * 2022-12-08 2023-04-11 业成科技（成都）有限公司 Backlight module and display device

Similar Documents

Publication Publication Date Title
US20070252922A1 (en) Liquid crystal display device
US20060061704A1 (en) Liquid crystal display device and a mobile information terminal including a liquid crystal display device
US9069207B2 (en) Display device
US20130033660A1 (en) Liquid crystal display module
CN109765716B (en) Ultra-narrow frame liquid crystal display module
KR102237372B1 (en) Connection Holder and Display Device having the same
CN109765722B (en) Display device
US9119287B2 (en) Display device and electronic apparatus
US20130194512A1 (en) Electro-optical device
CN210349098U (en) Backlight module and display device
CN110928041A (en) Backlight module and display device
KR102227016B1 (en) Display Device
CN114791682A (en) Backlight module and liquid crystal display device
JPH0688963A (en) Liquid crystal display panel
US6657685B2 (en) LCD device having an improved backlight unit
US9341876B2 (en) Liquid crystal display device
CN110187542B (en) Liquid crystal display device
CN114859595B (en) Display panel, manufacturing method of display panel and display device
CN109031746B (en) Double-rubber-frame backlight module
US20220369011A1 (en) Display apparatus
CN114783304B (en) Display device and spliced display device
CN214201993U (en) Backlight module and display device
US8625042B2 (en) Display device
CN213244183U (en) Liquid crystal television and display screen thereof
CN210295069U (en) Narrow-edge capacitive touch screen structure

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination