WO2016149965A1 - 光学膜片、背光模组及显示装置 - Google Patents

光学膜片、背光模组及显示装置 Download PDF

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Publication number
WO2016149965A1
WO2016149965A1 PCT/CN2015/076178 CN2015076178W WO2016149965A1 WO 2016149965 A1 WO2016149965 A1 WO 2016149965A1 CN 2015076178 W CN2015076178 W CN 2015076178W WO 2016149965 A1 WO2016149965 A1 WO 2016149965A1
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WIPO (PCT)
Prior art keywords
film layer
film
plate
optical film
backlight module
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PCT/CN2015/076178
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English (en)
French (fr)
Inventor
曾杰
周革革
Original Assignee
深圳市华星光电技术有限公司
武汉华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司, 武汉华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US14/438,630 priority Critical patent/US9897739B2/en
Publication of WO2016149965A1 publication Critical patent/WO2016149965A1/zh

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    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to an optical film, a backlight module, and a display device.
  • a liquid crystal display device has been widely used as a display component of an electronic device in various electronic products.
  • the frame of the electronic device is designed to be narrower and narrower.
  • the backlight module is an important component in the liquid crystal display device, and the frame of the backlight module is also required to be narrower and narrower.
  • the backlight module of the prior art includes a light guide plate, a plastic frame disposed around the light guide plate, a back plate disposed around the plastic frame, a light source flexible circuit board, an LED, and a light shielding tape.
  • the flexible circuit board and the LED are fixed on the light guide plate and the plastic frame by the light shielding tape
  • the optical film is fixed on the plastic frame by the double-sided adhesive tape
  • the plastic frame is fixed on the back plate by the buckle structure or the double-sided tape.
  • the liquid crystal display is fixed by the double-sided tape and the backlight unit. This kind of structure makes the frame of the backlight module unable to meet the narrow requirements.
  • the invention also provides a backlight module and a display device.
  • the invention provides an optical film for use in a backlight module, the optical film comprising a first film layer and a second film layer superposed on the first film layer, the first film layer comprising two opposite sides And locating the two opposite sides away from the first film layer.
  • a plurality of third film layers are further disposed between the first film layer and the second film layer.
  • the present invention provides a backlight module, the backlight module includes a back plate, a light guide plate and an optical film, the back plate includes a bottom plate and two side plates disposed on the bottom plate, wherein the side plate is provided with an outer surface;
  • the optical film includes a first film layer and a second film layer superposed on the first film layer, the first film layer including two opposite sides, the two opposite end edges being away from the first film
  • the layer extends with a positioning piece; the light guiding plate and the optical film are mounted on the back plate, the optical film is stacked on the light guiding plate, and the second film is in contact with the light guiding plate, the positioning
  • the sheet covers the surface of the side plate away from the bottom plate and is bent and fixed to the outer surface of the side plate.
  • the second film layer includes two opposite sides, and two sides of the second film layer extend away from the second film layer to form a lug, and the lug is located below the positioning piece.
  • the backlight module further includes a reflective sheet, the reflective sheet is mounted on the bottom plate, and the reflective sheet and the optical film sandwich the light guide plate.
  • the present invention provides a display device, which includes a backlight module and a display panel, the display panel is disposed on the backlight module, and the double-sided adhesive is passed between the display panel and the optical film.
  • the backlight module includes a back plate, a light guide plate, and an optical film, wherein the back plate includes a bottom plate and two side plates disposed on the bottom plate, the side plate is provided with an outer surface;
  • the diaphragm includes a first film layer and a second film layer superposed on the first film layer, the first film layer includes two opposite sides, and the two opposite end edges extend away from the first film layer a positioning sheet;
  • the light guide plate and the optical film are mounted on the back plate, the optical film is stacked on the light guide plate, and the second film is in contact with the light guide plate, and the positioning piece covers the cover
  • the side plate is away from the surface of the bottom plate and is bent and fixed to the outer surface of the side plate.
  • the second film layer comprises two opposite sides, two sides of the second film layer extending away from the second film layer to form a lug, the lug being located below the positioning piece;
  • a positioning groove is defined in a surface of the side plate away from the bottom plate, and the lug is held in the positioning groove.
  • the backlight module of the invention saves the plastic frame, and the positioning piece is arranged at the edge of the optical film, and the positioning piece is arranged
  • the outer surface of the side plate of the backing plate is bent, and the thickness of the side plate and the optical film is much smaller than the thickness of the plastic frame and the side plate, thereby reducing the thickness of the backlight module frame.
  • Figure 1 is a schematic cross-sectional view showing an optical film of an embodiment of the present invention.
  • FIG. 2 is a schematic view showing the structure of a second diaphragm of the optical film of FIG. 1.
  • FIG. 3 is a schematic cross-sectional view of a backlight module having the optical film of FIG. 1 according to the present invention.
  • FIG. 4 is a schematic view showing a state in which the optical film of the backlight module shown in FIG. 3 is not attached.
  • FIG. 5 is a schematic cross-sectional view of the back panel of the backlight module illustrated in FIG. 3.
  • FIG. 5 is a schematic cross-sectional view of the back panel of the backlight module illustrated in FIG. 3.
  • a preferred embodiment of the present invention provides an optical film.
  • the optical film 10 includes a first film layer 11 and a second film layer 13 superposed on the first film layer 11.
  • the first film layer 11 includes two opposite sides (not labeled), the two opposite The side of the side extends away from the first film layer 11 with a positioning piece 112.
  • the optical film 10 has a rectangular flat shape.
  • the first film layer 11 and the second film layer 12 are the same size, and the positioning piece 112 also extends out of the second film 12.
  • the second film layer 12 includes two opposite sides 122 , and two side edges 122 of the second film layer 12 extend away from the second film layer 12 to form a lug 123 .
  • the lug 123 is located below the positioning piece 112.
  • the lugs 123 are one or more. In this embodiment, the lugs of each side edge 122 are plural and are spaced apart.
  • third film layers 13 are further disposed between the first film layer 11 and the second film layer 12.
  • the third film layer in the embodiment is preferably one.
  • the present invention also relates to a backlight module.
  • the backlight module includes a back plate 14 , a light guide plate 15 , and the optical film 10 .
  • the back plate 14 includes a bottom plate 141 and two side plates 142.
  • the bottom plate 141 and the side plate 142 define a receiving space for receiving the light guide plate 15 and the optical film 10 .
  • the two side plates 142 are oppositely disposed, and the side plates 142 are provided with an outer surface 143.
  • the light guide plate 15 and the optical film 10 are mounted on the back plate 14, the optical film 10 is stacked on the light guide plate 15, and the second film 12 is in contact with the light guide plate 15.
  • the positioning piece 112 covers the surface of the side plate 142 away from the bottom plate 141 and is bent and fixed to the outer surface of the side plate 142.
  • the positioning piece 112 and the outer surface of the side plate 142 are fixed by double-sided tape or glue.
  • the positioning piece 112 and the side plate 142 are fixed by the double-sided tape 17.
  • a protective film 18 is further disposed outside the double-sided tape 17.
  • the optical film 10 When the optical film 10 needs to be fixed to the back plate 14, the light guide plate 15 and the optical film 10 are mounted on the back plate 14, and the second film 12 is attached to the light guide plate 15, A positioning piece of a diaphragm 11 covers the surface of the side plate 142 away from the bottom plate 141 and extends out of the back plate 14; then the protective film 18 is removed, and the positioning piece 112 is bent toward the side plate 142 of the back plate 14. The positioning piece 112 is attached to the outer surface of the side plate 142 to be fixed.
  • the backlight module of the present invention saves the plastic frame, and the positioning piece 112 is disposed at the edge of the optical film 10, and the positioning piece 112 is bent and fixed to the outer surface of the side plate 142 of the back plate 14, the side plate and the optical
  • the thickness of the diaphragm is much smaller than the thickness of the plastic frame and the side plate, thereby reducing the thickness of the backlight module frame.
  • the light guide plate 15 has a plate shape.
  • the bottom plate 141 and the side plate 142 define a receiving space for receiving the light guide plate 15 and the optical film 10 .
  • the non-incident optical end of the light guide plate is in contact with the side plate 142.
  • a further positioning slot 144 is defined in the surface of the side plate 142 away from the bottom plate 141 .
  • the second diaphragm 12 is located between the two side plates 142 , and the lug 123 is clamped.
  • the surface of the search side panel 142 away from the bottom plate 141 is an upper surface 145.
  • the positioning groove 144 is formed on the upper surface and penetrates the side plate 142 toward the surface of the optical film 10 .
  • the second diaphragm is superimposed on the light guide plate 15 , and the lug 123 is locked in the positioning groove 144 to further position the optical film to ensure the stability of the optical film.
  • the backlight module further includes a reflective sheet 16 , and the reflective sheet 16 is disposed between the bottom plate 141 and the light guide plate 15 .
  • the present invention also provides a display device including the backlight module and the display panel, the display panel is disposed on the backlight module, and between the display panel and the optical film Fixed by double-sided tape.

Abstract

一种光学膜片（10），背光模组及显示装置，所述背光模组包括背板（14）、导光板（15）及光学膜片（10），所述背板（14）包括底板（141）及设于底板的两个侧板（142），所述侧板（142）设有外表面（143）；所述光学膜片（10）包括第一膜层（11）及叠加设于第一膜层（11）的第二膜层（12），第一膜层（11）包括两个相对的侧边，所述两个相对的侧边远离所述第一膜层（11）延伸有定位片（112）；所述导光板（15）及光学膜片（10）装于所述背板（14）上，所述光学膜片（10）叠置于导光板（15）上，所述第二膜片（12）与所述导光板（15）接触，所述定位片（112）覆盖所述侧板（142）远离底板（141）的表面并弯折后与所述侧板（142）外表面（143）贴合固定。

Description

光学膜片、背光模组及显示装置
本发明要求2015年3月20日递交的发明名称为“光学膜片、背光模组及显示装置”的申请号201510124667.7的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及液晶显示技术领域，特别涉及一种光学膜片、背光模组及显示装置。
背景技术
目前，液晶显示装置作为电子设备的显示部件已经广泛的应用于各种电子产品中，随着电子产品轻薄化的发展，电子设备的边框被设计得越来越窄。而背光模组则是液晶显示装置中的一个重要部件，背光模组的边框也势必要越来越窄。
现有技术中的背光模组均包括导光板、设置于所述导光板周围的胶框、设置于所述胶框周围的背板、灯源柔性电路板、LED以及遮光胶带，所述灯源柔性电路板和LED通过所述遮光胶带固定于所述导光板和胶框上，光学膜片通过遮光双面胶带固定在胶框上，胶框通过卡扣结构或者双面胶固定于背板上，液晶显示屏则通过双面胶与背光单元四周固定。该种结构使背光模组的边框无法满足较窄的要求。
发明内容
本发明的目的在于提供一种光学膜片，可以减小背光模组边框宽度。
本发明还提供一种背光模组及显示装置。
本发明提供一种光学膜片，用于背光模组中，所述光学膜片包括第一膜层及叠加设于第一膜层的第二膜层，第一膜层包括两个相对的侧边，所述两个相对的侧边远离所述第一膜层延伸有定位片。
其中，所述第二膜层包括两个相对侧边，所述第二膜层的两个侧边远离 所述第二膜层延伸形成凸耳，所述凸耳位于所述定位片下方。
其中，所述第一膜层与第二膜层之间还设有多个第三膜层。
本发明提供一种背光模组，所述背光模组包括背板、导光板及光学膜片，所述背板包括底板及设于底板的两个侧板，所述侧板设有外表面；所述光学膜片包括第一膜层及叠加设于第一膜层的第二膜层，第一膜层包括两个相对的侧边，所述两个相对的端边远离所述第一膜层延伸有定位片；所述导光板及光学膜片装于所述背板上，所述光学膜片叠置于导光板上，所述第二膜片与所述导光板接触，所述定位片覆盖所述侧板远离底板的表面并弯折后与所述侧板外表面贴合固定。
其中，所述第二膜层包括两个相对侧边，所述第二膜层的两个侧边远离所述第二膜层延伸形成凸耳，所述凸耳位于所述定位片下方。
其中，所述侧板远离底板的表面上开设有定位槽，所述凸耳卡持于定位槽内。
其中，所述背光模组还包括反光片，所述反光片装设所述底板上，所述反光片与所述光学膜片将所述导光板夹持。
其中，所述定位片与所述侧板外表面通过双面胶或者胶水贴合固定。
本发明提供一种显示装置，所述显示装置包括背光模组和显示面板，所述显示面板设于所述背光模组上，且所述显示面板与所述光学膜片之间通过双面胶固定，所述背光模组包括背板、导光板及光学膜片，其特征在于，所述背板包括底板及设于底板的两个侧板，所述侧板设有外表面；所述光学膜片包括第一膜层及叠加设于第一膜层的第二膜层，第一膜层包括两个相对的侧边，所述两个相对的端边远离所述第一膜层延伸有定位片；所述导光板及光学膜片装于所述背板上，所述光学膜片叠置于导光板上，所述第二膜片与所述导光板接触，所述定位片覆盖所述侧板远离底板的表面并弯折后与所述侧板外表面贴合固定。。
其中，所述第二膜层包括两个相对侧边，所述第二膜层的两个侧边远离所述第二膜层延伸形成凸耳，所述凸耳位于所述定位片下方；所述侧板远离底板的表面上开设有定位槽，所述凸耳卡持于定位槽内。
本发明的背光模组节省胶框，在光学膜片的边缘设置定位片，并将定位片 弯折固定于所述背板的侧板的外表面，所述侧板及光学膜片的厚度和远小于所述胶框与侧板的厚度，进而减小了背光模组边框的厚度。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例的光学膜片截面示意图。
图2是图1所述的光学膜片的第二膜片结构示意图。
图3是本发明具有图1所示的光学膜片的背光模组截面示意图。
图4是图3所述的背光模组的光学膜片未贴合的状态示意图。
图5是图3所述的背光模组的背板截面示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动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。
请参阅图1，本发明佳实施方式提供一种光学膜。述光学膜片10包括第一膜层11及叠加设于第一膜层11的第二膜层13，第一膜层11包括两个相对的侧边(图未标)，所述两个相对的侧边远离所述第一膜层11延伸有定位片112。本实施例中，所述光学膜片10为矩形平板状。所述第一膜层11与第二膜层12尺寸相同，并且所述定位片112同样延伸出所述第二膜片12。
请参阅图2，进一步的，所述第二膜层12包括两个相对侧边122，所述第二膜层12的两个侧边122远离所述第二膜层12延伸形成凸耳123，所述凸耳123位于所述定位片112下方。所述凸耳123为一个或者多个。本实施例中，每一侧边122的所述凸耳为多个，并且间隔设置。
进一步的，所述第一膜层11与第二膜层12之间还设有多个第三膜层13。 本实施例中所述第三膜层优选为一个。
请参阅图3，本发明还涉及一种背光模组，所述背光模组包括背板14、导光板15及所述光学膜片10。所述背板14包括底板141及两个侧板142，所述底板141与所述侧板142围成收容空间，用于收容所述所述导光板15及光学膜片10。所述两个侧板142相对设置，所述侧板142设有外表面143。所述导光板15及光学膜片10装于所述背板14上，所述光学膜片10叠置于导光板15上，所述第二膜片12与所述导光板15接触，所述定位片112覆盖所述侧板142远离底板141的表面并弯折后与所述侧板142外表面贴合固定。
请参阅图4，进一步的，所述定位片112与所述侧板142外表面通过双面胶或者胶水贴合固定。本实施例中，通过双面胶17固定所述定位片112与侧板142。在所述光学膜片10未装于背板14时，所述双面胶17外还设有保护膜18。当所述光学膜片10需要固定于背板14时，将导光板15及光学膜片10装于背板14上，所述第二膜片12贴于所述导光板15上，所述第一膜片11的定位片覆盖所述侧板142远离底板141的表面并延伸出所述背板14；然后撕去保护膜18，再向背板14的侧板142方向弯折所述定位片112直至所述定位片112与所述侧板142外表面贴合固定。
本发明的背光模组节省胶框，在光学膜片10的边缘设置定位片112，并将定位片112弯折固定于所述背板14的侧板142的外表面，所述侧板及光学膜片的厚度和远小于所述胶框与侧板的厚度，进而减小了背光模组边框的厚度。
本实施例中，所述导光板15为板状。所述底板141与所述侧板142围成收容空间，用以收容所述导光板15及光学膜片10。所述导光板的非入射光端与所述侧板142抵持。
请参阅图5，进一步的，所述侧板142远离底板141的表面上开设有定位槽144，所述第二膜片12位于所述两个侧板142之间，所述凸耳123卡持于定位槽144内。本实施例中，搜书侧板142远离底板141的表面为上表面145，所述定位槽144开设于所述上表面并贯穿所述侧板142朝向光学膜片10的表面。所述第二膜片叠加于所述导光板15上，所述凸耳123卡持于所述定位槽144内，进而对所属光学膜片进一步定位，保证了光学膜片的稳定性。
进一步的，背光模组还包括反光片16，所述反光片16装于底板141与所述导光板15之间。
本发明还提供一种显示装置，所述显示装置包括所述的背光模组和显示面板，所述显示面板设于所述背光模组上，且所述显示面板与所述光学膜片之间通过双面胶固定。
以上所揭露的仅为本发明较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (10)

  1. 一种光学膜片，用于背光模组中，其特征在于，所述光学膜片包括第一膜层及叠加设于第一膜层的第二膜层，第一膜层包括两个相对的侧边，所述两个相对的侧边远离所述第一膜层延伸有定位片。
  2. 如权利要求1所述的光学膜片，其特征在于，所述第二膜层包括两个相对侧边，所述第二膜层的两个侧边远离所述第二膜层延伸形成凸耳，所述凸耳位于所述定位片下方。
  3. 如权利要求2所述的光学膜片，其特征在于，所述第一膜层与第二膜层之间还设有多个第三膜层。
  4. 一种背光模组，所述背光模组包括背板、导光板及光学膜片，其特征在于，所述背板包括底板及设于底板的两个侧板，所述侧板设有外表面；所述光学膜片包括第一膜层及叠加设于第一膜层的第二膜层，第一膜层包括两个相对的侧边，所述两个相对的端边远离所述第一膜层延伸有定位片；所述导光板及光学膜片装于所述背板上，所述光学膜片叠置于导光板上，所述第二膜片与所述导光板接触，所述定位片覆盖所述侧板远离底板的表面并弯折后与所述侧板外表面贴合固定。
  5. 如权利要求4所述的背光模组，其特征在于，所述第二膜层包括两个相对侧边，所述第二膜层的两个侧边远离所述第二膜层延伸形成凸耳，所述凸耳位于所述定位片下方。
  6. 如权利要求5所述的背光模组，其特征在于，所述侧板远离底板的表面上开设有定位槽，所述第二膜片位于所述两个侧板之间，所述凸耳卡持于定位槽内。
  7. 如权利要求4所述的背光模组，其特征在于，所述背光模组还包括反光片，所述反光片装设所述底板上，所述反光片与所述光学膜片将所述导光板夹持。
  8. 如权利要求4所述的背光模组，其特征在于，所述定位片与所述侧板外表面通过双面胶或者胶水贴合固定。
  9. 一种显示装置，所述显示装置包括背光模组和显示面板，所述显示面 板设于所述背光模组上，且所述显示面板与所述光学膜片之间通过双面胶固定，其特征在于，所述背光模组包括背板、导光板及光学膜片，其特征在于，所述背板包括底板及设于底板的两个侧板，所述侧板设有外表面；所述光学膜片包括第一膜层及叠加设于第一膜层的第二膜层，第一膜层包括两个相对的侧边，所述两个相对的端边远离所述第一膜层延伸有定位片；所述导光板及光学膜片装于所述背板上，所述光学膜片叠置于导光板上，所述第二膜片与所述导光板接触，所述定位片覆盖所述侧板远离底板的表面并弯折后与所述侧板外表面贴合固定。。
  10. 如权利要求9所述的显示装置，其特征在于，所述第二膜层包括两个相对侧边，所述第二膜层的两个侧边远离所述第二膜层延伸形成凸耳，所述凸耳位于所述定位片下方；所述侧板远离底板的表面上开设有定位槽，所述凸耳卡持于定位槽内。
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