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WO2014146353A1 - 背光模组及液晶显示装置 - Google Patents

背光模组及液晶显示装置 Download PDF

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Publication number
WO2014146353A1
WO2014146353A1 PCT/CN2013/076863 CN2013076863W WO2014146353A1 WO 2014146353 A1 WO2014146353 A1 WO 2014146353A1 CN 2013076863 W CN2013076863 W CN 2013076863W WO 2014146353 A1 WO2014146353 A1 WO 2014146353A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical film
backlight module
light guide
liquid crystal
guide plate
Prior art date
Application number
PCT/CN2013/076863
Other languages
English (en)
French (fr)
Inventor
邹斌
刁凯
赵洪宇
李响
郭俊杰
高振伟
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2014146353A1 publication Critical patent/WO2014146353A1/zh

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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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • 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

Definitions

  • Embodiments of the present invention belong to the field of liquid crystal display technology, and in particular, to a backlight module and a liquid crystal display device. Background technique
  • a backlight module (Back Light Module) is used in a liquid crystal display device to provide a uniform, high-intensity light source for the liquid crystal panel (Cell).
  • the backlight module can be divided into a side-in backlight module and a direct-lit backlight module according to different positions of the light source in the backlight module, wherein the light source in the side-in backlight module is located on the side of the display panel.
  • the light source in the direct type backlight module is located at the bottom of the display panel.
  • the conventional side-lit backlight module generally includes a back plate 1 , a light source 2 disposed on a side of the back plate 1 , and a reflector 3 (Reflector) disposed on the back plate 1 .
  • Parts such as Light Guide Plate (LGP) and Optical Film 5 (Sheet).
  • the light guide plate 4 guides the direction of the light emitted by the light source, and the light passes through the optical film 5 so that the light emitted from the light guide plate 4 can be made uniform, and the brightness is enhanced in the direction perpendicular to the light guide plate 4.
  • the light source 2 is usually disposed on the side of the back plate 1 first, and then the reflective plate 3 is disposed above the back plate 1.
  • the light guide plate 4 and the optical film are disposed on the reflective plate.
  • the sheet 5 is then assembled into the plastic frame 10 to fix the position of each component.
  • the liquid crystal panel 6 is placed above the plastic frame 10, and the above components are assembled with the liquid crystal panel 6 through the middle frame 11, and finally They are placed together in the front frame 7 to assemble the display module.
  • both the whole liquid crystal display device and the display module are gradually becoming thinner.
  • both the manufacturer of the electric device/display device and the manufacturer of the liquid crystal panel are moving toward the integration direction.
  • Conventional backlight module structures tend to be in a reduced state in display devices.
  • the plastic frame is used to fix and support the components in the backlight module
  • the middle frame is used to engage the liquid crystal panel.
  • the presence of the plastic frame and the middle frame not only increases the number of components of the backlight module, but also increases the cost of the backlight module invisibly, and the backlight module cannot be thinned, which is difficult to conform to the trend of thinning the current display device. Summary of the invention
  • Embodiments of the present invention provide a backlight module and a liquid crystal display device, which are thinner in thickness and have lower cost.
  • a backlight module includes a back plate and a light guide plate and an optical film disposed on the back plate, a plate edge of the optical film and a plate of the light guide plate
  • the backlight module further includes a limiting unit, the limiting unit is disposed on the light guide plate, and the orthographic projection of the limiting unit on the optical film and the optical film
  • the chip portion is partially overlapped, and the limiting unit maintains the backlight module to maintain a set distance from the liquid crystal panel disposed on the backlight module.
  • the limiting unit includes a plurality of limiting blocks, each of the limiting blocks includes a supporting portion and a superimposing portion connected to a side of the supporting portion facing the optical film, the supporting The bottom surface of the portion is disposed on a top surface of the side of the light guide plate, and a portion of the superimposed portion is disposed to overlap the optical film.
  • the thickness of the support portion is greater than the thickness of the optical film, and a portion of the overlap portion disposed overlapping the optical film is smaller than a thickness of the support portion and the optical film. The difference in thickness.
  • the support portion is rectangular in cross section perpendicular to the optical film, and the superimposing portion is perpendicular to the cross-sectional shape of the optical film as a stepped shape having at least one chamfer, wherein the superimposed portion is One end having a large thickness is connected to the support portion, and a top surface of the superimposing portion is in the same plane as a top surface of the support portion.
  • the support portion is rectangular in cross section perpendicular to the optical film
  • the superimposing portion is perpendicular to the cross-sectional shape of the optical film, and has a large thickness in the superimposed portion.
  • One end is connected to the support portion, and a top surface of the superimposing portion is in the same plane as a top surface of the support portion.
  • the width of the support portion is less than the distance between the edge of the optical film and the edge of the light guide plate.
  • each of the side edges of the light guide plate is provided with a limiting block, and the length of the limiting block is less than or equal to the length of the corresponding side of the light guiding plate, and is greater than or equal to the optical film.
  • the length of the edge of the board; or, each of the sides of the light guide plate is provided with two or more limit blocks, and the sum of the lengths of the two or more limit blocks is less than or equal to the corresponding plate of the light guide plate.
  • the length of the side, and It is greater than or equal to the length of the corresponding edge of the optical film.
  • the limiting block is formed of polyester terephthalate, and the limiting block is bonded to the edge of the light guide plate with a viscous substance.
  • a plurality of the limit blocks are integrally formed or formed in a single piece.
  • the top surface of the light guide plate is further provided with a plurality of protrusions, the protrusions are spaced apart from the edge of the optical film, and corresponding to the edge of the optical film. contact.
  • a liquid crystal display device includes a liquid crystal panel, and the backlight module is further disposed.
  • the backlight module is disposed under the liquid crystal panel.
  • a front frame for fixing the backlight module and the liquid crystal panel is further included, and the front frame is provided with a reinforcing rib corresponding to a region where the light guide plate is provided with a limiting unit.
  • FIG. 1 is a schematic cross-sectional view showing the assembly of a backlight module and a liquid crystal panel in the prior art
  • FIG. 2 is a cross-sectional view showing the assembly of a backlight module and a liquid crystal panel according to Embodiment 1 of the present invention
  • FIG. 3A is a cross-sectional view of the limiting block in Embodiment 1;
  • 3B is a schematic cross-sectional view of the limiting block in Embodiment 2;
  • 3C is a schematic cross-sectional view of the limiting block in Embodiment 3.
  • 4A-4B are schematic diagrams showing assembly of a limit block according to Embodiment 1 of the present invention.
  • 5A-5C are top views of the limit block in the first embodiment of the present invention.
  • a backlight module includes a back plate and a light guide plate and an optical film disposed on the back plate, a plate edge of the optical film and a plate edge of the light guide plate
  • the backlight module further includes a limiting unit, the limiting unit is disposed on the light guide plate, and the orthographic projection of the limiting unit on the optical film and the optical film
  • the portion of the backlight module maintains a set distance from the liquid crystal panel disposed on the backlight module.
  • a liquid crystal display device includes a liquid crystal panel, and further includes the backlight module, and the backlight module is disposed under the liquid crystal panel.
  • a backlight module includes a backplane 1, a light source disposed on a side of the backplane 1, a reflector 3 disposed above the backplane, a light guide 4, and an optical film 5.
  • the optical film 5 includes a multilayer film such as a prism film or a diffusion film, and has a total thickness of less than 1 mm.
  • the edge of the optical film 5 is disposed away from the edge of the light guide plate 4 (ie, an optical film).
  • the sheet 5 is not aligned with the edge of the light guide plate 4).
  • the backlight module further includes a limiting unit, the limiting unit is disposed on the light guide plate, and a portion of the limiting unit is suspended above the optical film 5 to be on the optical film 5
  • the orthographic projection partially overlaps the optical film 5, and the limiting unit maintains the backlight module at a set distance from the liquid crystal panel 6 disposed on the backlight module.
  • the limiting unit includes a plurality of limiting blocks 8, each of the limiting blocks 8 includes a supporting portion 81 and a connecting body 81 to the optical film 5
  • the superimposing portion 82 on the side, the bottom surface of the support portion 81 is disposed on the top surface of the plate side of the light guide plate 4, and the portion of the superimposing portion 82 is overlapped with the optical film 5.
  • each of the plate edges of the light guide plate 4 is provided with a limiting block 8 , and the length a of the limiting block 8 is less than or equal to the length of the corresponding plate edge of the light guiding plate 4, and is greater than or equal to The length of the optical film 5 corresponding to the edge of the board is shown in Fig. 5A.
  • the support portion 81 is perpendicular to the cross section of the optical film, that is, the cross-sectional shape of the support portion 81 is a rectangle, and the cross-sectional shape of the superimposing portion 82 is a stepped shape having at least one chamfer, One end of the superimposing portion 82 having a large thickness is connected to the support portion 81, and the superposition The top surface of the portion 82 is flush with the top surface of the support portion 81.
  • the weight of the liquid crystal panel is directly carried directly above the limiting unit according to the gravity; and based on the above shape of the limiting block 8, the top surface area of the limiting block is greater than The bottom surface area, so that the limiting block 8 can better support the liquid crystal panel 6, and can prevent the optical film 5 from sliding out of the fixed area when the backlight module is placed on the side or inverted.
  • the width b of the supporting portion 81 is smaller than the distance between the edge of the optical film 5 and the edge of the light guide plate 4; meanwhile, the thickness hi of the supporting portion 81 is greater than
  • the thickness of the optical film 5, which is overlapped with the optical film 5, is smaller than the thickness h2 of the superimposing portion 82 by less than the thickness of the support portion 81 and the thickness of the optical film 5.
  • the limiting block 8 has a stepped shape with a folded corner.
  • the bottom surface of the supporting portion 81 of the limiting block 8 is completely disposed on the light guiding plate 4, so that the limiting block 8 can be better fixed.
  • the optical film 5 and the liquid crystal panel 6 can be effectively limited and positioned on the edge of the light guide plate 4; since the orthographic projection of the superimposing portion 82 in the limiting block 8 at least partially overlaps with the optical film 5, Therefore, the limiting block 8 can also prevent the light leakage problem between the light guide plate 4 and the optical film 5 due to the separation between the two.
  • the area and shape of the top surface of the limiting block 8 may be according to actual design requirements, for example, the size of the liquid crystal panel 6 matched thereto, and the liquid crystal.
  • the panel 6 is set in accordance with the external force strength to be subjected to in the use environment, and is not limited.
  • the limiting block 8 is formed of a buffer material, such as a silicon rubber, which is usually formed of PolyEthylene Terephthalate (PET).
  • PET is a crystalline thermoplastic plastic with a distinct melting point of 245-260 ° C. It has good dimensional stability, heat resistance, electrical insulation, and is inexpensive.
  • the limiting block 8 is adhered to the edge of the light guide plate 4 by using a viscous substance such as double-sided tape or glue.
  • one of the limit blocks may be formed in a regular shape, that is, the upper part of the limit block and the upper part respectively.
  • the lower half (of course, the left and right halves of the limit block can also be formed separately.
  • it is bonded to the whole by an adhesive tape 9 (similar to double-sided tape or glue), and then bonded to the light guide plate 4 by the adhesive tape 9.
  • the width of the upper half of the limiting block 8 is greater than the width of the lower half, and the upper half and the lower half are bonded together by the adhesive tape 9 in the overlapping area of the two, while at the limit.
  • the block 8 When the block 8 is bonded to the light guide plate 4, it is bonded to the light guide plate 4 only by the adhesive tape 9 on the bottom surface of the lower half.
  • the upper half of the limiting block is wider than the lower half of the limiting block (ie, the superimposing portion 82), and the optical film 5 can be used for limiting and preventing light leakage.
  • the limiting block 8 can also be integrally formed and bonded directly to the light guide plate 4 through the adhesive tape 9, as shown in FIG. 4B.
  • each of the single block limiting blocks 8 is separately processed into a strip shape, as shown in FIG. 5B, the two single block limiting blocks 8 are processed to form an L shape; or, the plurality of the limiting blocks 8 may be integrated.
  • the molding is formed into a frame shape as shown in Fig. 5C.
  • the bonding may be performed separately or directly.
  • the broken line along the longitudinal direction of the stopper block indicates the bonding position of the support portion 81 and the superposition portion 82.
  • the light source 2 in the backlight module includes a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode).
  • CCFL Cold Cathode Fluorescent Lamp
  • LED Light Emitting Diode
  • the backlight module is further provided with a reflector 3 between the back plate 1 and the light guide plate 4, and the light source 2 and the The arrangement of the reflector 3 in the backlight module is the same as that in the prior art, and details are not described herein again.
  • a liquid crystal display device including a liquid crystal panel 6 and the backlight module described above is provided, and the backlight module is disposed under the liquid crystal panel 6.
  • the backlight module further includes a front frame 7 for fixing the backlight module and the liquid crystal panel 6 .
  • the backlight module of the embodiment does not have the supporting role of the plastic frame on the liquid crystal panel 6, nor does the middle frame have the card cooperation with the liquid crystal panel 6, but uses the limiting block 8 to ensure the backlight.
  • the position of the optical film 5 in the module is engaged with the liquid crystal panel 6 through the front frame 7.
  • the front frame 7 is provided with a positioning retaining wall (not specifically identified in FIG. 2) parallel to the respective sides of the liquid crystal panel 6, and the positioning retaining wall is in contact with each side of the liquid crystal panel 6.
  • the entire positioning retaining wall of the front frame 7 forms a square-shaped frame on the side of the liquid crystal panel 6 capable of horizontally limiting the liquid crystal panel.
  • the limit retaining wall forming the mouth-shaped frame in the front frame 7 can correspond to the gate drive and the source of the liquid crystal panel 6 to be connected.
  • the (Source) driven region forms a partially hollow structure, and a partially open structure may be formed on a side corresponding to the liquid crystal panel 6, to save material or to meet the avoidance requirements of other structures.
  • the front frame of the liquid crystal display device in this embodiment can also adopt the structure of the front frame 7 used in the liquid crystal display device of the prior art, and the specific structure is shown in FIG.
  • the front frame 7 is made of any one of electrolytic plating steel, aluminum forming plate, engineering plastic or carbon fiber material, and the front frame 7 corresponds to The region of the light guide plate where the limiting unit is disposed is provided with a plurality of reinforcing ribs.
  • the back plate 1 and the front frame 7 are fixed by bolts and nuts or other fixing members, and the back plate 1 and the front frame 7 are fixed, so that the backlight module and the liquid crystal panel are integrally packaged.
  • the difference between the embodiment and the embodiment 1 is that, in the backlight module of the embodiment, the shape of the limiting block in the limiting unit is different from the shape of the limiting block in the first embodiment.
  • the supporting portion 81 is perpendicular to the cross section of the optical film, that is, the cross-sectional shape is a rectangle, and the cross-sectional shape of the superimposing portion 82 is a step having two folding angles.
  • the shape, that is, the limiting block 8 in the present embodiment is a stepped shape having three folding angles as a whole (of course, the limiting block does not limit the number of folding angles of the stepped shape, and the angle of the folding angle may be a right angle or a right angle).
  • one end of the superimposing portion 82 having a large thickness is connected to the support portion 81, and the top surface of the superimposing portion 82 is flush with the top surface of the support portion 81.
  • the width b of the supporting portion 81 is smaller than the distance between the edge of the optical film 5 and the edge of the light guide plate 4; meanwhile, the thickness hi of the supporting portion 81 is greater than
  • the thickness of the optical film 5, which is overlapped with the optical film 5, is smaller than the thickness h2 of the superimposing portion 82, which is smaller than the thickness of the support portion 81 and the thickness of the optical film 5.
  • Support A proper gap is left between the block 8 and the liquid crystal panel 6.
  • a liquid crystal display device includes a liquid crystal panel and the backlight module, and the backlight module is disposed under the liquid crystal panel.
  • the difference between the embodiment and the embodiment 1 is that, in the backlight module of the embodiment, the shape of the limiting block in the limiting unit is different from the shape of the limiting block in the first embodiment.
  • the support portion 81 of the limiting block 8 is perpendicular to the cross section of the optical film, that is, the cross-sectional shape is a rectangle, and the cross-sectional shape of the superimposing portion 82 is a right-angled triangular shape.
  • One end of the superimposing portion 82 having a large thickness is connected to the support portion 81, and the top surface of the superimposing portion 82 is flush with the top surface of the support portion 81.
  • the width b of the supporting portion 81 is smaller than the distance between the edge of the optical film 5 and the edge of the light guide plate 4; meanwhile, the thickness hi of the supporting portion 81 is greater than
  • the thickness of the optical film 5, which is overlapped with the optical film 5, is smaller than the thickness h2 of the superimposing portion 82, which is smaller than the thickness of the support portion 81 and the thickness of the optical film 5.
  • a proper gap is left between the support block 8 and the liquid crystal panel 6.
  • a liquid crystal display device includes a liquid crystal panel and the backlight module, and the backlight module is disposed under the liquid crystal panel.
  • the difference between the embodiment and the embodiment 1-3 is that, in the backlight module of the embodiment, the number of the limiting blocks in the limiting unit is different.
  • the limiting unit includes two or more limiting blocks, which are respectively arranged in rows or columns on one side of the light guide plate, and the length of the two or more limiting blocks. The sum is less than or equal to the length of the corresponding plate edge of the light guide plate, and is greater than or equal to the length of the corresponding plate edge of the optical film.
  • a liquid crystal display device includes a liquid crystal panel and the backlight module, and the backlight module is disposed under the liquid crystal panel.
  • the difference between the embodiment and the embodiment 1-4 is that, in the backlight module of the embodiment, the light guide plate is further provided with a protrusion (not shown) for positioning the limiting unit.
  • the top surface of the light guide plate is further provided with a plurality of protrusions, and the protrusions are spaced apart from the position of the edge of the optical film, and are corresponding to the plate of the optical film. Side contact.
  • the protrusions may be protrusions that are semi-spherical and can be exposed on the light guide plate.
  • the protrusions are arranged at a certain interval, for example, forming a shape corresponding to the edge of the optical film in rows or columns. It facilitates the positioning of the optical film on the light guide plate during assembly of the backlight module.
  • a liquid crystal display device includes a liquid crystal panel and the backlight module, and the backlight module is disposed under the liquid crystal panel.
  • the optical film is first positioned according to the position of the protrusion on the light guide plate.
  • a adhesive tape is disposed on the edge of the light guide plate, and the limit block is bonded to a predetermined position of the edge of the light guide plate to limit the optical film; then, the backlight module is The liquid crystal panels are combined and the front frame is put on, and the back plate and the front frame are fixed by bolts and nuts or other fixing members to maintain the overall strength of the liquid crystal panel and the backlight module.
  • the order of positioning the optical film on the light guide plate and the adhesive tape on the light guide plate is not limited, and may be according to actual needs during the specific assembly process. Easy to operate and flexible to adjust the assembly sequence.
  • the side-entry backlight module of the embodiment 1-5 adopts a frameless structure compared with the existing side-entry backlight module, and uses a limiting unit to limit the optical film;
  • the structure is such that the liquid crystal panel is carried on the light guide plate, and the liquid crystal panel is fixed by the front frame, so that the display device is compared with the existing one.
  • the display device having a plastic frame and a middle frame structure in the technology is thinner in thickness (the thickness is reduced approximately)
  • the weight is also greatly reduced (the middle frame is generally formed of steel material), which is more convenient to assemble; at the same time, the display device does not need to make any changes to the structure of the original side-in backlight module or only need
  • the structure of the individual components of the original side-lit backlight module is slightly modified.
  • the backlight module (further integrated with the liquid crystal panel) can be formed integrally by the pre-designed limit block and the commonly used double-sided tape.
  • the cost of the original plastic frame and the middle frame mold, the plastic frame and the middle frame material reduces the production cost by about 5% (the plastic frame saves about 2-3%, and the middle frame saves about 2%), especially suitable for thinning.
  • the display device is integrated with the display module.

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

Abstract

一种背光模组及液晶显示装置，背光模组包括背板（1）以及设置于背板（1）上的导光板（4）和光学膜片（5），光学膜片（5）的板边与导光板（4）的板边相离设置。背光模组还包括限位单元，限位单元设置于导光板（4）上，限位单元在光学膜片（5）上的正投影与光学膜片（5）部分重叠，限位单元使背光模组与设置于背光模组上的液晶面板（6）保持设定距离。

Description

背光模组及液晶显示装置 技术领域
本发明的实施例属于液晶显示技术领域， 尤其涉及一种背光模组及液晶 显示装置。 背景技术
液晶本身不发光， 因此， 在液晶显示装置 （Liquid Crystal Display)中采用 背光模组 (Back Light Module)为液晶面板（Cell )提供均匀、 高亮度的光源。 一般来说， 根据背光模组中光源分布位置的不同可将背光模组分为侧入式背 光模组和直下式背光模组， 其中， 侧入式背光模组中的光源位于显示面板的 侧面， 直下式背光模组中的光源位于显示面板的底部。
如图 1所示， 现有的侧入式背光模组一般包括背板 1、 设置在背板 1侧 面的光源 2(Light Source), 设置在背板 1上方的反射板 3(Reflector)、 导光板 4(Light Guide Plate, 筒称 LGP)和光学膜片 5 ( Sheet )等部件。 其中， 导光板 4引导光源发出的光线方向， 光线通过光学膜片 5使得由导光板 4出射的光 线能够变得均匀， 在垂直于导光板 4的方向上亮度加强。
传统技术中， 侧入式背光模组与液晶面板组装时， 通常是将光源 2先设 置在背板 1侧面， 然后在背板 1上方设置反射板 3 , 反射板上设置导光板 4 和光学膜片 5 , 然后将上述各部件套装于胶框 10内使各部件的位置固定， 接 着在胶框 10上方放置液晶面板 6,并通过中框 11将上述各部件与液晶面板 6 组装在一起， 最后一起置于前框 7内以组装形成显示模组。
目前， 不论是液晶显示装置整机还是显示模组均逐渐向薄型化发展， 经 调查研究发现，不论是电 ¾ /显示装置整机生产厂家，还是液晶面板生产厂家, 均向着一体化方向发展， 传统的背光模组结构在显示装置中趋于减小状态。 而在传统背光模组中， 由胶框来固定和支撑背光模组中的各部件， 并使用中 框卡合液晶面板。 胶框和中框的存在， 不仅使得背光模组的部件增多， 无形 中增加了背光模组的成本， 而且导致背光模组无法实现薄型化， 难以顺应目 前显示装置薄型化的趋势。 发明内容
本发明的实施例提供一种背光模组以及液晶显示装置， 该背光模组厚度 较薄， 且具有较低的成本。
根据本发明的第一方面， 提供一种该背光模组， 包括背板以及设置于所 述背板上的导光板和光学膜片， 所述光学膜片的板边与所述导光板的板边相 离设置， 其中， 该背光模组还包括有限位单元， 所述限位单元设置于所述导 光板上,所述限位单元在所述光学膜片上的正投影与所述光学膜片部分重叠， 所述限位单元使该背光模组与设置于该背光模组上的液晶面板保持设定距 离。
在一个示例中， 所述限位单元包括多个限位块， 每一所述限位块包括支 撑部以及连接于所述支撑部朝向所述光学膜片的一侧的叠加部， 所述支撑部 的底面设置于所述导光板的板边顶面， 部分所述叠加部与所述光学膜片重叠 设置。
在一个示例中， 所述支撑部的厚度大于所述光学膜片的厚度， 与所述光 学膜片重叠设置的部分所述叠加部的厚度小于所述支撑部的厚度与所述光学 膜片的厚度之差。
在一个示例中， 所述支撑部垂直于所述光学膜片的截面形状为矩形， 所 述叠加部垂直于所述光学膜片的截面形状为具有至少一个折角的阶梯形状， 所述叠加部中具有较大厚度的一端与所述支撑部连接， 所述叠加部的顶面与 所述支撑部的顶面在同一平面。
在一个示例中， 所述支撑部垂直于所述光学膜片的截面形状为矩形， 所 述叠加部垂直于所述光学膜片的截面形状为直角三角形形状， 所述叠加部中 具有较大厚度的一端与所述支撑部连接， 所述叠加部的顶面与所述支撑部的 顶面在同一平面。
在一个示例中， 所述支撑部的宽度小于所述光学膜片的板边与所述导光 板的板边的距离。
在一个示例中， 所述导光板的每一板边各设有一个限位块， 所述限位块 的长度小于等于所述导光板对应板边的长度， 而大于等于所述光学膜片对应 板边的长度； 或者， 所述导光板的每一板边各设有两个或以上的限位块， 所 述两个或以上的限位块的长度之和小于等于所述导光板对应板边的长度， 而 大于等于所述光学膜片对应板边的长度。
在一个示例中， 所述限位块采用聚酯对苯二甲酸乙酯形成， 所述限位块 采用具有黏性的物质粘结在所述导光板的板边上。
在一个示例中， 多个所述限位块一体成型形成或分别单块形成。
在一个示例中， 所述导光板的顶面还设置有多个凸起， 所述凸起间隔分 布于所述光学膜片的板边的位置， 并与对应的所述光学膜片的板边接触。
根据本发明的第二方面， 提供一种液晶显示装置， 包括液晶面板， 还包 括上述的背光模组， 所述背光模组设置于所述液晶面板的下方。
在一个示例中， 还包括用于固定所述背光模组与所述液晶面板的前框， 所述前框对应所述导光板设置有限位单元的区域设置有加强筋。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 筒单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1为现有技术中背光模组与液晶面板组装的剖面示意图；
图 2为本发明实施例 1中背光模组与液晶面板组装的剖面示意图； 图 3A为实施例 1中限位块的剖面示意图；
图 3B为实施例 2中限位块的剖面示意图；
图 3C为实施例 3中限位块的剖面示意图；
图 4A-图 4B为本发明实施例 1中限位块的组装示意图；
图 5A-图 5C为本发明实施例 1中限位块的俯视图。
图中： 1 —背板； 2 —光源； 3—反射板； 4 —导光板； 5 —光学膜片； 6— 液晶面板； 7 -前框； 8-限位块； 81-支撑部； 82叠加部； 9 -粘结带； 10 -胶 框； 11 -中框。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图，对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
根据本发明的一个实施例， 提供一种背光模组， 包括背板以及设置于所 述背板上的导光板和光学膜片， 所述光学膜片的板边与所述导光板的板边相 离设置， 其中， 该背光模组还包括有限位单元， 所述限位单元设置于所述导 光板上,所述限位单元在所述光学膜片上的正投影与所述光学膜片部分重叠， 所述限位单元使该背光模组与设置于该背光模组上的液晶面板保持设定距 离。
根据本发明的另一个实施例， 提供一种液晶显示装置， 包括液晶面板， 还包括上述的背光模组， 所述背光模组设置于所述液晶面板的下方。 以下将 对本发明实施例做进行具体描述。 实施例 1 :
如图 2所示， 一种背光模组， 包括背板 1、 设置在背板 1侧面的光源 2、 设置在背板上方的反射板 3、 导光板 4和光学膜片 5等部件。 其中， 所述光 学膜片 5 包括棱镜膜、 扩散膜等多层薄膜， 其总厚度小于 1mm,所述光学膜 片 5的板边与所述导光板 4的板边相离设置（即光学膜片 5与导光板 4的边 缘不对齐）。该背光模组还包括有限位单元，所述限位单元设置于所述导光板 上， 所述限位单元的一部分悬于光学膜片 5之上， 使其在所述光学膜片 5上 的正投影与所述光学膜片 5部分重叠， 所述限位单元使该背光模组与设置于 该背光模组上的液晶面板 6保持设定距离。
如图 2、 3A所示， 所述限位单元包括多个限位块 8, 每一所述限位块 8 包括支撑部 81以及连接于所述支撑部 81朝向所述光学膜片 5的一侧的叠加 部 82, 所述支撑部 81的底面设置于所述导光板 4的板边顶面， 部分所述叠 加部 82与所述光学膜片 5重叠设置。在本实施例中，所述导光板 4的每一板 边各设有一个限位块 8, 所述限位块 8的长度 a小于等于所述导光板 4对应 板边的长度， 而大于等于所述光学膜片 5对应板边的长度， 参见图 5A所示。
在限位块中， 所述支撑部 81垂直于所述光学膜片的截面， 即支撑部 81 的截面形状为矩形，所述叠加部 82的截面形状为具有至少一个折角的阶梯形 状， 所述叠加部 82中具有较大厚度的一端与所述支撑部 81连接， 所述叠加 部 82的顶面与所述支撑部 81的顶面在同一平面。 当液晶面板 6置于背光模 组之上时， 受重力作用， 液晶面板的重量直接承载于限位单元的正上方； 而 基于限位块 8的上述形状， 限位块的顶面面积大于其底面面积， 因此限位块 8既能更好地支撑液晶面板 6,又能防止光学膜片 5在背光模组侧放或倒置时, 滑出固定区域。
在限位块 8中，所述支撑部 81的宽度 b小于所述光学膜片 5的板边与所 述导光板 4的板边之间的距离； 同时， 所述支撑部 81的厚度 hi大于所述光 学膜片 5的厚度， 与所述光学膜片 5重叠设置的部分所述叠加部 82的厚度 h2小于所述支撑部 81的厚度与所述光学膜片 5的厚度之差。当多个限位块 8 形成与光学膜片 5的形状相适的封闭框时， 限位块 8即对光学膜片 5在三维 空间的各个方向 （平行于导光板 4的方向和垂直于导光板 4的方向）进行限 位。
图 3A所示为限位块 8整体为具有一个折角的阶梯形状， 由于限位块 8 中支撑部 81的底面完全设置于所述导光板 4上，因此能保证限位块 8较好地 固定于所述导光板 4的板边， 能对光学膜片 5和液晶面板 6进行有效的限位 和定位； 由于限位块 8中叠加部 82的正投影与光学膜片 5至少有部分重叠， 因此限位块 8同时还能防止导光板 4与光学膜片 5之间因其二者之间相离设 计而可能出现的漏光问题。 这里应该理解的是， 限位块 8的顶面 （包括支撑 部 81和叠加部 82的顶面） 的面积和形状可根据实际设计需要， 例如： 与之 配合的液晶面板 6的尺寸大小、 液晶面板 6在使用环境中需承受的外力强度 等进行设定， 不做限定。
优选的是， 所述限位块 8采用緩沖类材料形成， 例如含有硅元素的橡胶 ( silicon rubber ),通常采用聚酯对苯二甲酸乙酯（ PolyEthylene Terephthalate, 筒称 PET )形成。 PET为结晶性热可塑性塑料， 具有明显熔点 245-260°C , 具有良好的尺寸安定性、 耐热性、 电绝缘性， 而且价格便宜。 本实施例中， 所述限位块 8采用具有黏性的物质，例如双面胶或胶水,粘结在导光板 4的板 边。
为了方便工艺制作， 同时也为了方便限位块 8先限定光学膜片 5在高度 方向上的位置， 一个所述限位块可以按规则形状分别形成， 即分别形成限位 块的上半部分和下半部分（当然也可以分别形成限位块的左半部分和右半部 分）， 然后通过粘结带 9 (类似双面胶或胶水）粘结成整体， 然后再通过粘结 带 9粘结在导光板 4上。 如图 4A所示， 限位块 8中上半部分的宽度大于下 半部分的宽度， 上半部分与下半部分在二者的重叠区域采用粘结带 9粘结在 一起， 而在限位块 8与导光板 4粘结时， 仍只在下半部分的底面采用粘结带 9与导光板 4进行粘结。 其中， 上半部分限位块较下半部分限位块宽出的部 分（即叠加部 82 )即可对光学膜片 5起到限位和防漏光作用。 当然， 限位块 8也可以一体成型形成，直接通过粘结带 9粘结在导光板 4上，如图 4B所示。 如图 5A所示为各个单块限位块 8单独加工形成条形，如图 5B所示为两个单 块限位块 8加工形成 L形；或者，多个所述限位块 8可以一体成型形成框形， 如图 5C所示。 相应的， 在限位块 8与导光板 4粘结时， 可分别单独进行粘 结， 或者整体直接粘结。 其中， 图 5A、 5B、 5C中沿限位块长度方向的虚线 表示支撑部 81与叠加部 82的结合位置。
本实施例中， 背光模组中的光源 2包括 CCFL(Cold Cathode Fluorescent Lamp, 冷阴极荧光灯)或 LED(Light Emitting Diode, 发光二极管）。 为保证背 光模组中光源 2具有较高的利用率， 如图 2所示， 该背光模组在所述背板 1 与所述导光板 4之间还设置有反射板 3, 光源 2与所述反射板 3在背光模组 中的设置与现有技术相同， 这里不再赘述。
在本实施例中， 还提供一种液晶显示装置， 包括液晶面板 6以及上述的 背光模组， 所述背光模组设置于所述液晶面板 6的下方。
如图 2所示， 在背光模组与液晶面板组装后的剖面示意图中， 该背光模 组还包括用于固定所述背光模组与所述液晶面板 6的前框 7。 本实施例的背 光模组相比现有的背光模组， 没有胶框对液晶面板 6的支撑作用， 也没有中 框对液晶面板 6的卡合作用， 而是采用限位块 8来保证背光模组中光学膜片 5的位置， 并通过前框 7使背光模组与液晶面板 6进行卡合。 具体的， 前框 7 中设置有与液晶面板 6的各个侧面平行的定位挡墙（图 2中未具体标识），定 位挡墙与液晶面板 6的各个侧面接触。 在如图 2所示的液晶面板 6的放置方 向， 前框 7的整个定位挡墙在液晶面板 6侧面形成能对液晶面板进行水平限 位的一个口字形框。根据具体的液晶显示装置的设计要求,形成前框 7中口字 形框的限位挡墙可以在对应着需连接液晶面板 6的栅极 ( Gate )驱动和源极 ( Source )驱动的区域形成部分中空的结构， 也可以在对应着液晶面板 6的 某个侧面形成部分开放的结构， 以节省材料或满足其它结构的避让要求。 当 然， 本实施例中液晶显示装置的前框也可以采用现有技术中的液晶显示装置 中所采用的前框 7的结构， 具体结构参考图 1所示。
在本实施例中， 为保证该液晶显示装置的强度， 所述前框 7采用电解镀 辞钢、 铝质成型板材、 工程塑料或碳纤维材料中的任一种制成， 所述前框 7 对应所述导光板设置有限位单元的区域设置有若干加强筋。 背板 1与前框 7 采用螺栓与螺母或其他固定部件来进行固定， 背板 1与前框 7的固定， 使得 背光模组与液晶面板封装为一个整体。
在该液晶显示装置的组装过程中： 当背光模组的背板 1 (含光源 2 )、 反 射板 3和导光板 4设置好后， 预先在导光板 4的板边设置具有黏性的粘结带 9, 并将限位块 8粘结在导光板 4的板边预定位置； 接着， 将光学膜片 5稍微 通过预先设置的粘结带 9与导光板 4粘结在一起； 然后， 将背光模组与液晶 面板 6组合在一起， 并套上前框 7, 背板 1与前框 7采用螺栓与螺母或其他 固定部件来进行固定， 以保持液晶面板 6与背光模组的整体强度。 实施例 2:
本实施例与实施例 1的区别在于， 本实施例的背光模组中， 限位单元中 限位块的形状与实施例 1中的限位块的形状不相同。
如图 3B所示， 本实施例的所述限位块 8中， 支撑部 81垂直于所述光学 膜片的截面， 即截面形状为矩形，叠加部 82的截面形状为具有两个折角的阶 梯形状， 即本实施例中限位块 8整体为具有三个折角的阶梯形状（当然， 限 位块并不限定阶梯形状的折角数， 折角的角度可以为直角也可以不为直角）。 与实施例 1相同， 所述叠加部 82中具有较大厚度的一端与所述支撑部 81连 接， 所述叠加部 82的顶面与所述支撑部 81的顶面在同一平面。
在限位块 8中，所述支撑部 81的宽度 b小于所述光学膜片 5的板边与所 述导光板 4的板边之间的距离； 同时， 所述支撑部 81的厚度 hi大于所述光 学膜片 5的厚度， 与所述光学膜片 5重叠设置的部分所述叠加部 82的厚度 h2小于所述支撑部 81的厚度与所述光学膜片 5的厚度之差， 可以保证支撑 块 8与液晶面板 6之间留有适当的间隙。
在本实施例中， 还提供一种液晶显示装置， 包括液晶面板以及上述的背 光模组， 所述背光模组设置于所述液晶面板的下方。
本实施例中背光模组、 液晶显示装置的其他结构与实施例 1相同， 这里 不再详细叙述。 实施例 3:
本实施例与实施例 1的区别在于， 本实施例的背光模组中， 限位单元中 限位块的形状与实施例 1中的限位块的形状不相同。
如图 3C所示， 在本实施例中， 所述限位块 8中支撑部 81垂直于所述光 学膜片的截面，即截面形状为矩形，叠加部 82的截面形状为直角三角形形状， 所述叠加部 82中具有较大厚度的一端与所述支撑部 81连接，所述叠加部 82 的顶面与所述支撑部 81的顶面在同一平面。
在限位块 8中，所述支撑部 81的宽度 b小于所述光学膜片 5的板边与所 述导光板 4的板边之间的距离； 同时， 所述支撑部 81的厚度 hi大于所述光 学膜片 5的厚度， 与所述光学膜片 5重叠设置的部分所述叠加部 82的厚度 h2小于所述支撑部 81的厚度与所述光学膜片 5的厚度之差， 可以保证支撑 块 8与液晶面板 6之间留有适当的间隙。
在本实施例中， 还提供一种液晶显示装置， 包括液晶面板以及上述的背 光模组， 所述背光模组设置于所述液晶面板的下方。
本实施例中背光模组、 液晶显示装置的其他结构与实施例 1相同， 这里 不再详细叙述。 实施例 4:
本实施例与实施例 1-3的区别在于， 本实施例的背光模组中， 限位单元 中限位块的数量不相同。
在本实施例中， 限位单元包括两个或两个以上的限位块， 它们分别排列 成行或列设置在所述导光板的一个板边， 所述两个或以上的限位块的长度之 和小于等于所述导光板对应板边的长度， 而大于等于所述光学膜片对应板边 的长度。 在本实施例中， 还提供一种液晶显示装置， 包括液晶面板以及上述的背 光模组， 所述背光模组设置于所述液晶面板的下方。
本实施例中背光模组、 液晶显示装置的其他结构与实施例 1相同， 这里 不再详细叙述。 实施例 5:
本实施例与实施例 1-4的区别在于， 本实施例的背光模组中， 导光板上 还设置有对限位单元进行定位的凸起（图中未示出）。
在本实施例中， 所述导光板的顶面还设置有多个凸起， 所述凸起间隔分 布于所述光学膜片的板边的位置， 并与对应的所述光学膜片的板边接触。 其 中， 凸起可以为呈半球形形状、 能显露于导光板上的凸起， 这些凸起按照一 定的形状间隔排列， 例如按行或按列形成对应于光学膜片的板边的形状， 以 方便背光模组组装过程中光学膜片在导光板上的定位。
在本实施例中， 还提供一种液晶显示装置， 包括液晶面板以及上述的背 光模组， 所述背光模组设置于所述液晶面板的下方。
相应的，在该液晶显示装置的组装过程中： 当背光模组的背板（含光源）、 反射板和导光板设置好后， 根据导光板上的凸起分布位置将光学膜片先定位 在导光板上， 接着在导光板的板边设置具有黏性的粘结带， 并将限位块粘结 在导光板的板边预定位置对光学膜片进行限位； 然后， 将背光模组与液晶面 板组合在一起， 并套上前框， 背板与前框采用螺栓与螺母或其他固定部件来 进行固定， 以保持液晶面板与背光模组的整体强度。
这里应该理解的是， 上述液晶显示装置的组装过程中， 将光学膜片定位 在导光板上和将粘结带设置在导光板上的顺序不做限定， 在具体组装过程中 可根据实际需要或操作方便灵活调整组装顺序。
本实施例中背光模组、 液晶显示装置的其他结构与实施例 1相同， 这里 不再详细叙述。 实施例 1-5中的侧入式背光模组与现有的侧入式背光模组相比， 采用了 无胶框结构， 而采用限位单元来限位光学膜片； 同时也无中框结构， 使液晶 面板承载于导光板上， 并通过前框来固定液晶面板， 使得显示装置相较现有 技术中具有胶框和中框结构的显示装置的厚度更薄 （厚度约减小了
1.5-2mm ), 重量也大大减小 （中框一般采用钢制材料形成）， 组装更方便； 同时， 该显示装置不需对原有侧入式背光模组各部件结构做任何改动或仅需 对原有侧入式背光模组的个别部件结构做艮小改动， 通过预先设计好的限位 块以及常用的双面胶即可将背光模组（进一步与液晶面板）形成一个整体， 省去了原有的胶框与中框模具、 胶框与中框材料的成本， 使得生产成本降低 约 5% (胶框约节约 2-3%, 中框约节约 2% ) , 尤其适用于薄型化的显示装置 整机与显示模组一体化的结构。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1. 一种背光模组， 包括背板以及设置于所述背板上的导光板和光学膜 片， 所述光学膜片的板边与所述导光板的板边相离设置， 其中， 该背光模组 还包括有限位单元， 所述限位单元设置于所述导光板上， 所述限位单元在所 述光学膜片上的正投影与所述光学膜片部分重叠， 所述限位单元使该背光模 组与设置于该背光模组上的液晶面板保持设定距离。
2.根据权利要求 1所述的背光模组， 其中， 所述限位单元包括多个限位 块， 每一所述限位块包括支撑部以及连接于所述支撑部朝向所述光学膜片的 一侧的叠加部， 所述支撑部的底面设置于所述导光板的板边顶面， 部分所述 叠加部与所述光学膜片重叠设置。
3.根据权利要求 2所述的背光模组， 其中， 所述支撑部的厚度大于所述 光学膜片的厚度， 与所述光学膜片重叠设置的部分所述叠加部的厚度小于所 述支撑部的厚度与所述光学膜片的厚度之差。
4.根据权利要求 3所述的背光模组， 其中， 所述支撑部垂直于所述光学 膜片的截面形状为矩形， 所述叠加部垂直于所述光学膜片的截面形状为具有 至少一个折角的阶梯形状， 所述叠加部中具有较大厚度的一端与所述支撑部 连接， 所述叠加部的顶面与所述支撑部的顶面在同一平面。
5.根据权利要求 3所述的背光模组， 其中， 所述支撑部垂直于所述光学 膜片的截面形状为矩形， 所述叠加部垂直于所述光学膜片的截面形状为直角 三角形形状， 所述叠加部中具有较大厚度的一端与所述支撑部连接， 所述叠 加部的顶面与所述支撑部的顶面在同一平面。
6.根据权利要求 4或 5所述的背光模组， 其中， 所述支撑部的宽度小于 所述光学膜片的板边与所述导光板的板边之间的距离。
7.根据权利要求 6所述的背光模组， 其中， 所述导光板的每一板边各设 有一个限位块， 所述限位块的长度小于等于所述导光板对应板边的长度， 而 大于等于所述光学膜片对应板边的长度； 或者， 所述导光板的每一板边各设 有两个或以上的限位块， 所述两个或以上的限位块的长度之和小于等于所述 导光板对应板边的长度， 而大于等于所述光学膜片对应板边的长度。
8.根据权利要求 7所述的背光模组， 其中， 所述限位块采用聚酯对苯二 甲酸乙酯形成，所述限位块采用具有黏性的物质粘结在所述导光板的板边上。
9.根据权利要求 8所述的背光模组， 其中， 多个所述限位块一体成型形 成或分别单块形成。
10.根据权利要求 9所述的背光模组， 其中， 所述导光板的顶面还设置 有多个凸起， 所述凸起间隔分布于所述光学膜片的板边的位置， 并与对应的 所述光学膜片的板边接触。
11. 一种液晶显示装置， 包括液晶面板， 其中， 还包括如权利要求 1-10 中任一项所述的背光模组， 所述背光模组设置于所述液晶面板的下方。
12.根据权利要求 11所述的液晶显示装置， 其中， 还包括用于固定所述 背光模组与所述液晶面板的前框， 所述前框对应所述导光板设置有限位单元 的区域设置有加强筋。
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