CN107515490B - Backlight module and liquid crystal display device - Google Patents

Backlight module and liquid crystal display device Download PDF

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Publication number
CN107515490B
CN107515490B CN201710778446.0A CN201710778446A CN107515490B CN 107515490 B CN107515490 B CN 107515490B CN 201710778446 A CN201710778446 A CN 201710778446A CN 107515490 B CN107515490 B CN 107515490B
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China
Prior art keywords
back plate
light guide
guide plate
backlight module
liquid crystal
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CN201710778446.0A
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Chinese (zh)
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CN107515490A (en
Inventor
唐志强
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Hisense Visual Technology Co Ltd
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Hisense Electric Co Ltd
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    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02B6/0085—Means for removing heat created by the light source from the package
    • 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
    • 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
    • G02B6/009—Positioning aspects of the light source 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
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133314—Back frames
    • 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
    • G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
    • 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
    • G02F1/133628—Illuminating devices with cooling means

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention provides a backlight module and a liquid crystal display device. The backlight module comprises a front frame, a middle frame, a supporting frame, a back plate, a light guide plate, an LED lamp bar and a PCB, wherein the side surface of the light guide plate comprises a light incident side; the back plate is arranged below the light guide plate, a back plate groove is formed in one side, opposite to the light guide plate, of the back plate, and the length of the back plate is larger than that of the light guide plate in the direction perpendicular to the light incident side of the light guide plate and towards the outside; the middle frame is arranged above the back plate; the support frame is arranged between the middle frame and the light incident side of the light guide plate, and a rectangular cavity is formed by the support frame, the middle frame and the back plate; the LED lamp strip is arranged on the light incident side of the light guide plate; the PCB is arranged between the light guide plate and the back plate groove and is connected with the LED lamp strip. The disclosed liquid crystal display device comprises a panel and the backlight module. The invention can reduce the space occupied by the backlight module on the thickness, realize the integral flush design effect without steps of the liquid crystal display device and further realize the ultrathin wall-mounted design of the liquid crystal display device.

Description

Backlight module and liquid crystal display device
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a liquid crystal display device.
Background
In recent years, in the field of liquid crystal display devices, with the change of aesthetic demands of consumers on the display devices, the liquid crystal display devices are being made thinner and lighter under the push of manufacturers and consumers, and therefore, the ultra-thin wall-mounted liquid crystal display devices are also receiving increasing attention from consumers. The ultrathin liquid crystal display device can reduce the weight and the volume of the display device, and is favorable for realizing wall-mounted suspension of the display device.
Fig. 1 is a partial cross-sectional view of a liquid crystal display device of a conventional structure. The liquid crystal display device 100 includes a front frame 110, a front panel 111, a light guide plate 112, a back plate 113, a heat sink 114, a light bar PCB 115, an LED light bar 116, a driving board 117, a flexible cable 118, and a rear case 119. The LED light bar 116 is disposed on the light incident side of the light guide plate 112 and connected to the light bar PCB 115; the heat sink 114 includes a vertical plate parallel to the light bar PCB 115 and a bottom plate fixedly connected to the lower surface of the back plate 113; the drive board 117 is located below the bottom plate of the heat sink 114; the front frame 110 includes an appearance frame restricting horizontal displacement of the panel 111 and a horizontal frame connected to the rear case 119; a gap is reserved between the vertical plate of the heat sink 114 and the horizontal frame of the front frame 110, and the flexible cable 118 is electrically connected to the panel 111 and the driving board 117 through the gap, wherein the heat sink 114 mainly conducts and dissipates heat generated by the lamp strip PCB 115 and the LED lamp strip 116 during operation, so as to ensure the normal operation of the liquid crystal display device 100.
The defects in the prior art are illustrated by combining a partial sectional view of a structure of a liquid crystal display device, which is common in the prior art, with fig. 1. In the prior art, the ultra-thin wall-hung type liquid crystal display device mostly adopts a backpack design, in the liquid crystal display device 100, the appearance frame part of the front frame 110, the panel 111, the light guide plate 112, the heat radiator 113, the driving board 117 and the rear shell 119 occupy space in the thickness direction, which is not beneficial to the thinning of the liquid crystal display device, and especially, the overturning and fixing design of the heat radiator 113 and the driving board 117 makes the liquid crystal display device to be in a step structure in side view, which is not beneficial to the wall-mounted suspension of the liquid crystal display device.
Disclosure of Invention
The invention provides a backlight module and a liquid crystal display device, which adopt two-in-one of a radiator and a back plate, wherein a back plate groove is arranged on the back plate for placing a PCB (printed circuit board), and a rectangular cavity is arranged between a middle frame and a supporting frame for placing a driving plate, so that the size in the thickness direction is reduced, and the design of a stepless ultrathin wall pasting of the liquid crystal display device is realized.
The application of the invention provides a backlight module, which comprises a front frame, a middle frame, a supporting frame, a back plate, a light guide plate, an LED light bar, a PCB (printed circuit board) and a driving plate, wherein the side surface of the light guide plate comprises a light incident side; the back plate is positioned below the light guide plate, a back plate groove is formed in one side, opposite to the light guide plate, of the back plate, and the length of the back plate is larger than that of the light guide plate in the direction perpendicular to the light incident side of the light guide plate and towards the outside; the middle frame is arranged above the back plate; the support frame is positioned between the middle frame and the light incident side of the light guide plate, and a rectangular cavity is formed between the support frame and the middle frame as well as between the support frame and the back plate; the LED lamp strip is arranged on the light incident side of the light guide plate; the PCB is arranged between the light guide plate and the back plate groove and is connected with the LED lamp strip;
furthermore, the back plate is made of a material with good heat conducting performance.
Preferably, the back plate material is aluminum.
Further, the back plate groove is formed by machining or punching.
Preferably, the back plate groove is machined.
Furthermore, the PCB is L-shaped, the L-shaped vertical end is a wire outlet end and is electrically connected with the LED lamp strip, and the L-shaped bottom end is a wiring end and is fixedly connected with the back plate groove.
Furthermore, the LED lamp strips are lamp strip groups and are uniformly arranged at the vertical ends of the PCB.
Further, the middle frame and the supporting frame are provided with bosses, the middle frame bosses are abutted to the edges of the back plate, and the heights of the supporting frame bosses are equal to the depth of the grooves of the back plate.
Furthermore, the driving board is placed in the rectangular cavity between the middle frame and the supporting frame, and the bottom surface of the driving board is fixedly connected with the back plate.
Preferably, the front frame is a rigid material of the order of 0.2 mm.
Preferably, the driving plate, the supporting frame, the middle frame and the back plate are all connected in an adhesive manner.
The invention also provides a liquid crystal display device, which comprises the backlight module and a panel, wherein the panel is arranged above the middle frame, a step part is formed in the direction vertical to the light incident side of the light guide plate, and the front frame is bonded on the step part of the middle frame and the panel, so that the design effect that the front frame is flush with the panel and has no step is realized.
The application of the invention provides a backlight module and a liquid crystal display device, wherein the backlight module comprises: the front frame, the middle frame, the supporting frame, the back plate, the light guide plate, the LED lamp strip, the PCB and the driving plate, wherein the back plate is made of a material with good heat dissipation performance and has the functions of supporting and dissipating heat, the back plate is provided with a back plate groove for placing the L-shaped PCB, the supporting frame is arranged between the light incident side of the light guide plate and the middle frame and forms a rectangular cavity with the middle frame for placing the driving plate, the front frame is arranged on the step part of the middle frame and the panel by adopting a rigid material with the grade of 0.2mm, compared with the prior art, the driving plate is arranged between the middle frame and the supporting frame and is overturned and fixed compared with the driving plate in the prior art, the overall size of the backlight module is reduced in thickness, the back plate and the radiator are integrated, the space for placing the radiator is saved, the thickness of the backlight module is further reduced, the heat conduction performance and the heat dissipation performance are better, the, the front frame realizes the design effect of flushing with the panel outside when guaranteeing rigidity intensity, and whole liquid crystal display device wholly presents no step, has got rid of prior art's knapsack design, really realizes that liquid crystal display device's ultra-thin "pastes the wall" and hangs.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the solutions in the prior art, 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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a schematic view of a partial structure of a backlight module in the prior art;
FIG. 2 is a schematic view of a partial structure of a backlight module according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of an LED light bar disposed on a PCB according to an embodiment of the present invention;
FIG. 4 is a partial view of a front frame and a front panel assembly according to an embodiment of the present invention;
FIG. 5A is a schematic diagram of a backplane according to an embodiment of the present invention;
fig. 5B is a schematic structural diagram of a second backplane according to an embodiment of the present invention.
Reference numerals:
100-backlight module 110-front frame 111-panel 112-light guide plate
113-back plate 114-heat sink 115-light bar PCB board 116-LED light bar
117-drive board 118-flexible cable 119-rear housing
200-backlight module 210-panel 2101-upper polarizer
2102-CF glass 2103-TFT glass 211-front frame 212-middle frame
213-support frame 214-light guide plate 215-backboard 2151-backboard groove
216-LED light bar 217-PCB 2171-L-shaped vertical end 2172-L-shaped bottom end
218-drive board 219-flex cable.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It is noted that examples of the described embodiments are illustrated in the accompanying drawings, where like reference numerals refer to the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
In the description of the present invention, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or components must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the two components can be mechanically connected or electrically connected, directly connected or indirectly connected through an intermediate medium, communicated inside the two components or in an interaction relationship of the two components. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example one
An embodiment of the present application provides a backlight module, as shown in fig. 2, which is a schematic view of a partial structure of the backlight module in the embodiment of the present application. A backlight module 200 comprises a panel 210, a front frame 211, a middle frame 212, a supporting frame 213, a light guide plate 214, a back plate 215, an LED light bar 216, a PCB 217 and a driving plate 218. Wherein, the side of the light guide plate 214 includes a light incident side; the back plate 215 is arranged below the light guide plate 214, a back plate groove 2151 is arranged on one side opposite to the light guide plate 214, and the length of the back plate 215 is greater than that of the light guide plate 214 in the direction perpendicular to the light incident side of the light guide plate 214; the middle frame 212 is arranged above the back plate 215, and the middle frame 214 comprises a boss abutting against the edge of the back plate 215; the supporting frame 213 is located above the back plate 215 and between the middle frame 212 and the light incident side of the light guide plate 214, a rectangular cavity is formed between the supporting frame 213 and the middle frame 212 and between the back plate 215, and the rectangular cavity is used for placing the driving board 218; the LED light bars 216 are arranged on the light incident side of the light guide plate 214; the PCB is disposed between the light guide plate 214 and the rear plate groove 2151, and is connected to the LED light bar.
Furthermore, the backboard 215 is made of a material with a good heat dissipation coefficient, so that the backboard 215 can replace a radiator in the prior art while playing a role in fixing and supporting, and when the liquid crystal display device normally works, the functions of heat conduction and heat dissipation are realized, so that the use of the radiator is avoided, the size of the radiator is saved in the thickness of the liquid crystal display device, the overall thickness of the liquid crystal display device is reduced, and the thinning of the liquid crystal display device is realized.
Preferably, the material of the back plate 215 is aluminum.
Further, as shown in fig. 3, in the embodiment of the present application, the shape of the PCB 217 is L-shaped, the L-shaped vertical end 2171 is a wire outlet end and electrically connected to the LED light bar 216, the L-shaped bottom end 2172 is a wire distribution end, and the length of the back plate groove 2151 is greater than that of the L-shaped bottom end 2172, so that the L-shaped bottom end 2172 can be completely fixed on the bottom surface of the inner side of the back plate groove 2151, thereby implementing fixed connection to the PCB 217 and increasing the overall contact area between the PCB 217 and the back plate groove 2151, and better implementing heat conduction and dissipation of the PCB 217.
Preferably, the bottom end of the L-shape is bonded to the back plate groove 2151.
Further, as shown in fig. 2, a gap is left between the support frame 213 and the front frame 211, and the thickness of the gap is greater than the thickness of the flexible cable 219, so that the flexible cable 219 passes through the gap during assembly to electrically connect the driving board 218 and the panel 210, thereby achieving the normal operation of the panel 210.
Further, in order to ensure the backlight brightness of the liquid crystal display device with sufficient intensity and uniform light during normal operation, the LED light bars 216 in the embodiment of the present application are a plurality of light bar groups, and are uniformly distributed on the L-shaped vertical end 2171, and fig. 3 is a schematic structural view of the LED light bars 216 uniformly distributed on the PCB board 217. The PCB 217 provides power to the LED light bar 216 and controls the intensity of the light, thereby providing an adjustable uniform brightness for the liquid crystal display device.
Further, heat generated by the LED light bar 216 is conducted to the back plate 215 through the PCB 217, so as to dissipate the heat.
Further, as shown in fig. 2, in the embodiment of the present application, the driving plate 218 is disposed in the rectangular cavity between the middle frame 212 and the supporting frame 213 and fixed on the back plate 215, the height of the rectangular cavity between the middle frame 212 and the supporting frame 213 is greater than or equal to the overall height of the driving plate 218, and the length of the rectangular cavity is greater than or equal to the overall length of the driving plate 218. Compared with the mode that the driving board 117 is fixed at the rear of the back plate 113 in the prior art in a turnover mode, the mode that the driving board 217 is placed between the rectangular cavities of the middle frame 212 and the supporting frame 213 saves the space size required for fixing the driving board 217 in the thickness direction, further reduces the size of the liquid crystal display device in the thickness direction, eliminates the backpack design and the step structure in the prior art, and realizes the ultrathin wall-attached design of the liquid crystal display device.
Furthermore, bosses are arranged on the support frame 213 and the middle frame 212, the height of the boss of the middle frame 212 is equal to the thickness of the backboard 215, and the height of the boss of the support frame 213 is equal to the depth of the backboard groove 2151;
preferably, the driving plate 218, the supporting frame 213 and the middle frame 212 are connected to the back plate 215 by bonding.
Preferably, the front frame 211 of the embodiment of the present application is made of a rigid material with a 0.2mm grade. FIG. 4 is a partial view of the front frame and the panel assembly. As shown in fig. 4, the panel 210 is composed of three layers of structures, namely, an upper polarizer 2101, CF glass 2102 and TFT glass 2103, a step is formed between the upper polarizer 2101 and the CF glass 2102, a front frame 211 made of a rigid material with a thickness of 0.2mm is bonded to the upper surface of the CF glass 2102 and the middle frame 212, the upper polarizer 2101 and the middle frame 212 protrude to limit the position, the outer side of the panel 210 is flush with the outer side of the front frame 211, the sufficient rigidity of the front frame 211 is ensured, the appearance of the liquid crystal display device is optimized, and the front surface of the liquid crystal display device is flush and has no protrusion.
Example two
Optionally, the second embodiment of the present application provides two processing modes of the back plate groove, namely stamping processing and machining. As shown in fig. 5A, a back plate groove 2151 is formed by a punching process. The stamping process has the advantages that: the processing efficiency of the back plate groove 2151 is high, the thickness of the back plate 215 is small, and the overall thickness of the liquid crystal display device is the minimum; the disadvantages are that: stamping processing can form a stamping bulge on the outer surface of the back plate 215, so that the outer surface of the back plate 215 has a height difference, and the back surface of the back plate cannot be completely flush, thereby causing certain influence on the complete wall-attached suspension of the liquid crystal display device.
Preferably, as shown in fig. 5B, the backplate grooves 3151 are formed by machining. Compared with a stamping mode, the machining mode has the advantages that: the outer surface of the back plate is completely flush without height difference, and the whole liquid crystal display device is in a flush and step-free design, so that the complete wall-attached hanging design of liquid crystal display is realized; the disadvantages are that: in order to ensure that the machined back plate groove 3151 has a certain strength, the back plate 315 needs to have a thickness greater than the thickness of the punched back plate 215, which increases the overall thickness of the liquid crystal display device, and is not beneficial to thinning the liquid crystal display device.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the beneficial technical effects that:
the application of the invention provides a backlight module and a liquid crystal display device, wherein the backlight module comprises: the LED lamp comprises a front frame, a middle frame, a supporting frame, a back plate, a light guide plate, an LED lamp bar, a PCB and a driving plate, wherein the side surface of the light guide plate comprises a light incident side; the back plate is arranged below the light guide plate, a back plate groove is formed in one side, opposite to the light guide plate, of the back plate, and the length of the back plate is larger than that of the light guide plate in the direction perpendicular to the light incident side of the light guide plate and towards the outside; the middle frame is arranged above the back plate and comprises a boss abutted against the edge of the back plate; the support frame is positioned above the back plate and between the middle frame and the light incident side of the light guide plate, a rectangular cavity is formed between the support frame and the middle frame and between the back plate, and the rectangular cavity is used for placing a driving plate; the LED lamp strip is arranged on the light incident side of the light guide plate; the PCB is arranged between the light guide plate and the back plate groove and is connected with the LED lamp strip.
In the backlight module provided by the application, the back plate is made of a material with a good heat dissipation coefficient, so that the back plate can replace a radiator in the prior art while playing a role in fixing and supporting, and heat conduction and dissipation are realized, so that the radiator is avoided, the size of the radiator is saved in the thickness space of the liquid crystal display device, the overall thickness of the liquid crystal display device is further reduced, and the thinning of the liquid crystal display device is realized; meanwhile, the PCB is L-shaped and comprises a vertical end electrically connected with the LED lamp strip and a bottom end fixed with the back plate, so that the contact area with the back plate is increased, the heat conduction and the heat dissipation of the LED lamp strip and the PCB are better realized, and the size of the PCB is reduced in thickness space, so that the overall thickness of the liquid crystal display device is further reduced; set up the rectangle cavity between center and carriage, the drive plate is prevented putting in the rectangle cavity, fixes on the backplate, and the upset with drive plate among the prior art is fixed and is compared by the mode at board rear, and the required space size of fixed drive plate has been saved to the fixed mode of drive plate in this application in thickness direction, further reduces liquid crystal display device's thickness, has eliminated knapsack design and stair structure among the prior art, is favorable to realizing liquid crystal display device's ultra-thin wall design of pasting.
EXAMPLE III
The third embodiment of the present application further provides a liquid crystal display device, which includes a panel 210 and the backlight module 200 described in the first and second embodiments. The backlight module 200 is disposed opposite to the panel 210, and the panel 210 is disposed on the upper surface of the backlight module 200; the structure, function and function of the backlight module 200 have been described in detail in the foregoing embodiments, and are not described herein again.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A backlight module is characterized in that the backlight module comprises:
a front frame; the side surface of the light guide plate comprises a light incident side;
the back plate is positioned below the light guide plate, a back plate groove is formed in one side, opposite to the light guide plate, of the back plate, and the length of the back plate is larger than that of the light guide plate in the direction perpendicular to the light incident side of the light guide plate and outwards;
a middle frame disposed above the back plate;
the supporting frame is positioned between the middle frame and the light incident side of the light guide plate, and a rectangular cavity is formed by the supporting frame, the middle frame and the back plate;
the LED lamp strip is arranged on the light incident side of the light guide plate;
the PCB is arranged between the light guide plate and the back plate groove and is connected with the LED lamp strip, the PCB is L-shaped, the L-shaped vertical end is a wire outlet end and is electrically connected with the PCB lamp strip, and the L-shaped bottom end is a wiring end and is fixedly connected with the back plate groove;
bosses are arranged on the middle frame and the support frame, the bosses of the middle frame are abutted against the edge of the back plate, and the height of the bosses of the support frame is equal to the depth of the grooves of the back plate;
the drive plate is placed in a rectangular cavity between the middle frame and the support frame, and the bottom surface of the drive plate is fixedly connected with the back plate, wherein the height of the rectangular cavity is greater than or equal to that of the drive plate, and the length of the rectangular cavity is greater than or equal to that of the drive plate.
2. The backlight module as claimed in claim 1, wherein the back plate is made of a material with good thermal conductivity.
3. The backlight module as claimed in claim 2, wherein the material of the back plate is aluminum.
4. The backlight module as claimed in claim 1, wherein the back plate groove is formed by machining or punching.
5. The backlight module as claimed in claim 1, wherein the LED light bars are light bar groups uniformly arranged on the vertical ends of the PCB.
6. A liquid crystal display device, characterized in that the liquid crystal display device comprises the backlight module according to any one of claims 1-5.
7. The liquid crystal display device according to claim 6, further comprising: the panel, the panel sets up in the center top, and is at the perpendicular to form step portion in the direction of light guide plate income light side, preceding frame bonds the center with panel step portion realizes preceding frame with the design effect that the panel parallel and level does not have the step.
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CN208041841U (en) * 2018-05-03 2018-11-02 合肥京东方显示光源有限公司 A kind of lamp bar, backlight module and display device
CN108663841B (en) * 2018-05-08 2021-05-28 昆山龙腾光电股份有限公司 Liquid crystal display device and manufacturing method thereof
CN109031793B (en) * 2018-10-15 2024-02-06 四川长虹电器股份有限公司 Liquid crystal display device having a light shielding layer
CN109188744B (en) * 2018-10-25 2020-09-18 福耀玻璃工业集团股份有限公司 Transparent liquid crystal display hollow glass
CN109410770B (en) * 2019-01-08 2021-11-26 高创(苏州)电子有限公司 Display panel and display device
CN110441939A (en) * 2019-07-24 2019-11-12 青岛海信电器股份有限公司 A kind of display device
CN115016174B (en) * 2022-06-17 2023-06-16 重庆惠科金渝光电科技有限公司 Backlight module and display module

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KR101946832B1 (en) * 2011-10-07 2019-02-13 엘지이노텍 주식회사 The backlight unit and the display device having the same
CN102865528A (en) * 2012-10-18 2013-01-09 深圳市华星光电技术有限公司 Backlight module and liquid crystal display device
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