WO2013185368A1 - 一种背光模组和液晶显示装置 - Google Patents

一种背光模组和液晶显示装置 Download PDF

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Publication number
WO2013185368A1
WO2013185368A1 PCT/CN2012/077201 CN2012077201W WO2013185368A1 WO 2013185368 A1 WO2013185368 A1 WO 2013185368A1 CN 2012077201 W CN2012077201 W CN 2012077201W WO 2013185368 A1 WO2013185368 A1 WO 2013185368A1
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WO
WIPO (PCT)
Prior art keywords
light
optical film
backlight module
disposed
emitting surface
Prior art date
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Ceased
Application number
PCT/CN2012/077201
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English (en)
French (fr)
Inventor
胡哲彰
贺虎
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/581,314 priority Critical patent/US20130335674A1/en
Publication of WO2013185368A1 publication Critical patent/WO2013185368A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source 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
    • G02B6/0088—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
    • G02B6/0091—Positioning aspects of the light source relative to the light guide

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module and a liquid crystal display device.
  • the structure of the existing liquid crystal display device mainly includes a backlight module, a liquid crystal panel, and a front frame.
  • the backlight module is composed of an LED light source, a light guide plate, an optical film, a plastic frame, a back plate and the like. As the efficiency of the LED light source increases, in order to reduce the cost, the number of LED light sources will gradually decrease, and in this case, the spacing between the LED light sources will increase.
  • the light source emits light as a point light source, and the LED light source on the light strip is not continuously illuminated.
  • an effective light mixing distance that is, within a distance from the LED light source to the visible area (AA area) of the backlight module, it is difficult to uniformly mix the light. .
  • the increase in the spacing between the LED light sources or the decrease in the mixing distance will cause defects in the backlight module to be unevenly distributed (mura).
  • the optical film since the width of the optical film attached under the plastic frame is narrow, in order to ensure that the optical film does not slide out of the backlight module, the optical film usually extends directly to the guide.
  • the edge of the light plate causes the light of the LED light source to directly enter the optical film, and after multiple reflections, is exposed from the opening of the backlight module, thereby generating light leakage.
  • the technical problem to be solved by the present invention is to provide a backlight module and a liquid crystal display device to improve the uneven distribution of light and dark on the light incident side of the backlight module.
  • a technical solution adopted by the present invention is to provide a backlight module, comprising: a light guide plate, comprising a light incident surface and a light emitting surface connected to the light incident surface; On one side of the light incident surface, a plurality of LED light sources are disposed at intervals on a side of the light bar near the light incident surface; an optical film is disposed on the light emitting surface, and the optical film includes a plurality of notches near the side of the light bar.
  • the plastic frame comprises a body portion, an extension extending from the body portion to above the light-emitting surface, and a bottom portion from the extension portion
  • the light shielding portion extending toward the recess, the side of the optical film adjacent to the light bar is located between the extending portion and the light emitting surface, and the end surface of the light blocking portion away from the extending portion abuts on the light emitting surface of the light guide plate.
  • the optical film is a diffusion sheet, a prism sheet or a brightness enhancement sheet, and a plurality of notches are formed by cutting the optical film.
  • the edge of the side of the optical film is flush with the edge where the light-emitting surface and the light-incident surface meet, and the shape of the end surface of the light-shielding portion matches the shape of the recess.
  • a backlight module comprising: a light guide plate, comprising a light incident surface and a light emitting surface connected to the light incident surface; a light source is disposed on a side of the light incident surface, and a plurality of LED light sources are disposed on a side of the light strip near the light incident surface; an optical film is disposed on the light emitting surface, and the optical film includes a plurality of concaves on a side of the light bar.
  • the mouth and the plurality of notches are arranged in one-to-one correspondence with the plurality of LED light sources.
  • the notch is rectangular, curved or triangular.
  • the optical film is a diffusion sheet, a prism sheet or a brightness enhancement sheet, and a plurality of notches are formed by cutting the optical film.
  • the backlight module further includes a plastic frame, and the plastic frame includes a body portion extending from the body portion to an upper portion of the light-emitting surface, and the side of the optical film near the light bar is located between the extending portion and the light-emitting surface.
  • the plastic frame further includes a light shielding portion extending from the bottom of the extending portion toward the recess, and the light blocking portion abuts the light emitting surface of the light guide plate away from the end surface of the extending portion.
  • the edge of the side edge of the optical film is flush with the edge where the light-incident surface of the light-emitting surface intersects, and the shape of the end surface of the light-shielding portion matches the shape of the notch.
  • a liquid crystal display device including: a back plate; a light guide plate disposed on the back plate, including a light incident surface and the light entering a light-emitting surface that is connected to the surface; a light bar is disposed on one side of the light-incident surface, and a plurality of LED light sources are disposed at intervals on a side of the light-strip adjacent to the light-incident surface; an optical film is disposed on the light-emitting surface, and the optical film is disposed
  • the side of the light bar has a plurality of notches, and the plurality of notches are arranged in one-to-one correspondence with the plurality of LED light sources;
  • the plastic frame comprises a body portion extending from the body portion to an upper portion of the light-emitting surface, and the optical film is close to the lamp.
  • the side of the strip is located between the extending portion and the light-emitting surface; the liquid crystal panel is disposed on the plastic
  • the notch is rectangular, curved or triangular.
  • the optical film is a diffusion sheet, a prism sheet or a brightness enhancement sheet, and a plurality of notches are formed by cutting the optical film.
  • the plastic frame further includes a light shielding portion extending from the bottom of the extending portion toward the recess, and the end surface of the light shielding portion abuts on the light emitting surface of the light guide plate.
  • the edge of the side of the optical film is flush with the edge where the light-emitting surface and the light-incident surface meet, and the shape of the end surface of the light-shielding portion matches the shape of the recess.
  • the invention has the beneficial effects that the optical film of the invention is shaped by cutting according to the arrangement of the LED light source, and the optical film is correspondingly arranged as a notch in the light of the light in front of the LED light source, so that the optical film is prevented from being Here, the concentrating effect is generated; on the other hand, in the dark light between the adjacent two LED light sources, the brightness is increased by the light collecting action of the optical film, thereby improving the light and darkness existing on the light entering side of the backlight module. The problem of uneven distribution.
  • the light shielding portion of the plastic frame blocks the light emitted from the LED light source to the corresponding recess on the optical film, the light of the LED light source is directly prevented from entering the optical film, thereby reducing the probability of light leakage of the backlight module, thereby improving
  • the light leakage problem of the backlight module under the narrow bezel design improves the display quality of the backlight module and the liquid crystal display panel.
  • FIG. 1 is a schematic cross-sectional structural view of a backlight module of the present invention
  • FIG. 2 is a schematic structural view of an optical film and a light bar of the present invention
  • Figure 3 is a schematic view showing a first embodiment of the optical film of the present invention.
  • Figure 4 is a schematic view showing a second embodiment of the optical film of the present invention.
  • Figure 5 is a schematic view showing a third embodiment of the optical film of the present invention.
  • Figure 6 is a schematic view showing the structure of a liquid crystal display device of the present invention.
  • the backlight module 100 includes a light guide plate 110 , a light bar 120 , an optical film 130 , and a plastic frame 140 .
  • the light guide plate 110 includes a light incident surface 111 and a light exit surface 112 that is in contact with the light incident surface 111.
  • the light strip 120 is disposed on one side of the light incident surface 111, and the light strip 120 is spaced apart from the light incident surface 111.
  • FIG. 2 is a schematic view showing the optical film 130 in the present invention corresponding to the light bar 120
  • FIG. 3 is a schematic view showing the first embodiment of the optical film 130 in the present invention.
  • the optical film 130 near the side of the light bar 120 includes notches 131a, 131b, 131c, 131d, 131e...131n, and the notches 131a, 131b, 131c, 131d, 131e... 131n is formed by cutting the optical film 130.
  • the plurality of notches are disposed in one-to-one correspondence with the plurality of LED light sources.
  • the notch 131a is disposed corresponding to the LED light source 121a
  • the notch 131b is disposed corresponding to the LED light source 121b
  • the notch 131c is disposed corresponding to the LED light source 121c.
  • the notch 131d is provided corresponding to the LED light source 121d
  • the notch 131e is provided corresponding to the LED light source 121e
  • the notch 131n is provided corresponding to the LED light source 121n.
  • the optical film 130 has a plurality of protrusions 132.
  • the protrusions 132 are located between two adjacent notches, that is, the protrusions 132 are disposed corresponding to the area between the two adjacent LED light sources 121.
  • the notches 131a, 131b, 131c, 131d, 131e, ... 131n are rectangular. It should be understood that in other embodiments of the invention, the notches 131a, 131b, 131c, 131d, 131e...131n may also be curved (shown in Figure 4) or triangular (shown in Figure 5).
  • the optical film 130 is used to increase the brightness or uniformity of the light emitted by the backlight module, such as a diffuser (Piff), a prism (Prism), or a brightness enhancement (DBEF, Dual Brightness Enhancement Film).
  • a diffuser Piff
  • prism Prism
  • DBEF Dual Brightness Enhancement Film
  • the main function of the diffuser is to provide a uniform surface light source for the display, and the material has a high light transmittance.
  • the prism sheet is a concentrating device that mainly uses the total reflection and refraction laws to concentrate the dispersed light at a certain angular range, thereby increasing the brightness in the range of angles.
  • the brightness enhancement film is a concentrating device and is mainly used to improve the brightness of the light emitting surface of the backlight module.
  • the plastic frame 140 includes a body portion 141, an extending portion 142, and a light shielding portion 143.
  • the main body portion 141 is spaced apart from the light incident surface 111
  • the extending portion 142 extends from the main body portion 141 to the light emitting surface 112 .
  • the light blocking portion 143 extends from the bottom of the extending portion 142 toward the optical film 130 .
  • the side of the optical film 130 having the notch is located between the extending portion 142 and the light-emitting surface 112, the light-shielding portion 143 extends toward the notch on the optical film 130, and the light-shielding portion 143 is away from the end surface 30 of the extending portion 142.
  • the edge of the side of the optical film 130 is flush with the edge where the light-emitting surface 112 and the light-incident surface 111 intersect (as shown in FIG. 2), and the end surface 145 of the light-shielding portion 143.
  • the shape matches the shape of the notches 131a, 131b, 131c, 131d, 131e, ... 131n.
  • the material of the light shielding portion 143 may be a material having high light absorption or low light reflectance such as plastic, polyethylene terephthalate, silica gel or microporous polymer material.
  • the structure of the light shielding portion 143 and the body 141 may be integrally formed in the form of injection molding or other suitable existing methods.
  • the optical film 130 in the lighter front of the LED light source 121 is correspondingly disposed as a notch to avoid the light collecting effect of the optical film 130; on the other hand, in the phase
  • the light between the two adjacent LED light sources 121 is dark, and the brightness of the dark portions between the adjacent two LED light sources 121 can be improved by the light collecting action of the corresponding protruding portions 132 on the optical film 130. This can reduce the difference in brightness and darkness of the light incident surface 111, thereby improving the problem of uneven distribution of light and dark on the light exiting surface 112.
  • the LED light source can be blocked.
  • the light emitted by the 121 to the corresponding recess prevents the light emitted from the LED light source 121 from directly entering the optical film 130, thereby reducing the probability of light leakage from the light incident surface 111.
  • FIG. 6 is a schematic view showing the structure of a liquid crystal display device of the present invention.
  • the backlight module 100 is used as a backlight in the liquid crystal display device 600 , and further includes a back plate 610 , a liquid crystal panel 620 , and a front frame 630 .
  • the light guide plate 110 is disposed on the back plate 610 , and the liquid crystal panel 620 is disposed on the top surface of the extending portion 142 of the plastic frame 140 .
  • the front frame 630 is assembled with the back plate 610 to firmly hold the liquid crystal panel 620 between the front frame 630 and the plastic frame 644.
  • the front frame 630 and the back plate 610 can be fixed by screwing or setting a snap structure.
  • the edge of the side of the optical film 130 extends to be flush with the edge where the light-emitting surface 112 and the light-incident surface 111 intersect, and the projection 132 of the optical film 130 is pressed against the glue during assembly. Between the extending portion 142 of the frame 140 and the light-emitting surface 112 of the light guide plate 110, the length of the optical film 130 extending under the plastic frame 140 is ensured, and the optical film 130 can be effectively prevented from slipping out of the backlight module 100. .
  • the present invention uses an optical film that is shaped according to the arrangement of the LED light source.
  • the optical film In the light where the light in front of the LED light source is bright, the optical film is correspondingly set as a notch to prevent the optical film from being placed here.
  • the condensing effect is generated; on the other hand, in the dark light between the adjacent two LED light sources, the brightness is increased by the light collecting action of the optical film, thereby improving the light and dark distribution existing on the light incident side of the backlight module. The problem of both.
  • the light shielding portion of the plastic frame blocks the light emitted from the LED light source to the corresponding recess on the optical film, the light of the LED light source is directly prevented from entering the optical film, thereby reducing the probability of light leakage of the backlight module, thereby improving
  • the light leakage problem of the backlight module under the narrow bezel design improves the display quality of the backlight module and the liquid crystal display panel.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Description

一种背光模组和液晶显示装置
【技术领域】
本发明涉及显示技术领域，具体而言涉及一种背光模组和液晶显示装置。
【背景技术】
现有的液晶显示装置的结构主要包括背光模组、液晶面板以及前框。其中，背光模组由LED光源、导光板、光学膜片、胶框、背板等组成。随着LED光源效率的提升，为降低成本，LED光源的颗数会逐渐较少，在这种情况下LED光源之间的间距会增加。
同时，由于LED 光源发光为点光源，灯条上的LED光源并不是连续发光，在有效的混光距离内，即在LED光源到背光模组的可视区域（AA区）的距离内，难以将光线混合均匀。并且，随着LED背光的发展，必须进一步减小LED光源的混光距离以实现窄边框的设计。
承前所述，LED光源之间的间距增加或是混光距离变小均会造成背光模组出现亮暗分布不均（mura）的缺陷。
进一步的，在窄边框设计下，由于在胶框下压附的光学膜片的宽度很窄，但为了保证光学膜片不会从背光模组中滑出，光学膜片通常会直接伸到导光板的边缘，因而导致LED光源的光线直接进入光学膜片中，并经过多次反射后从背光模组的开口处露出，产生漏光现象。
综上所述，有必要提供一种背光模组和液晶显示装置。
【发明内容】
本发明主要解决的技术问题是提供一种背光模组和液晶显示装置，以改善背光模组入光侧的亮暗分布不均的问题。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种背光模组，该背光模组包括：导光板，包括入光面以及与入光面相接的出光面；灯条，设置于入光面的一侧，灯条靠近入光面的一侧间隔设置有多个LED光源；光学膜片，设置于出光面上，且光学膜片靠近灯条的侧边包括多个凹口，多个凹口与多个LED光源一一对应设置，且凹口为矩形、弧形或三角形；胶框，包括本体部、从本体部延伸至出光面上方的延伸部以及从延伸部的底部朝向凹口延伸的遮光部，光学膜片靠近灯条的侧边位于延伸部与出光面之间，且遮光部远离延伸部的端面抵接于导光板的出光面。
其中，光学膜片为扩散片、棱镜片或增亮片，通过裁切光学膜片形成多个凹口。
其中，光学膜片的侧边的边缘与出光面和入光面相交处的边缘平齐，遮光部的端面的形状与凹口的形状相契合。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种背光模组，该背光模组包括：导光板，包括入光面以及与入光面相接的出光面；灯条，设置于入光面的一侧，灯条靠近入光面的一侧间隔设置有多个LED光源；光学膜片，设置于出光面上，且光学膜片靠近灯条的侧边包括多个凹口，多个凹口与多个LED光源一一对应设置。
其中，凹口为矩形、弧形或三角形。
其中，光学膜片为扩散片、棱镜片或增亮片，通过裁切光学膜片形成多个凹口。
其中，背光模组还包括胶框，该胶框包括本体部、从本体部延伸至出光面上方的延伸部，光学膜片靠近灯条的侧边位于延伸部与出光面之间。
其中，胶框还包括从延伸部的底部朝向凹口延伸的遮光部，且遮光部远离延伸部的端面抵接于导光板的出光面。
其中，光学膜片的侧边的边缘与出光面入光面相交处的边缘平齐，遮光部的端面的形状与凹口的形状相契合。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种液晶显示装置，该液晶显示装置包括：背板；导光板，设置于背板上，其包括入光面以及与入光面相接的出光面；灯条，设置于入光面的一侧，灯条靠近入光面的一侧间隔设置有多个LED光源；光学膜片，设置于出光面上，且光学膜片靠近灯条的侧边具有多个凹口，多个凹口与多个LED光源一一对应设置；胶框，包括本体部、从本体部延伸至出光面上方的延伸部，光学膜片靠近灯条的侧边位于延伸部与出光面之间；液晶面板，设置于胶框上；前框，与背板组装，以使液晶面板稳固夹持于前框与胶框之间。
其中，凹口为矩形、弧形或三角形。
其中，光学膜片为扩散片、棱镜片或增亮片，通过裁切光学膜片形成多个凹口。
其中，胶框进一步包括从延伸部的底部朝向凹口延伸的遮光部，且遮光部的端面抵接于导光板的出光面。
其中，光学膜片的侧边的边缘与出光面和入光面相交处的边缘平齐，遮光部的端面的形状与凹口的形状相契合。
本发明的有益效果是：本发明通过使用依据LED光源的排布进行形状裁切的光学膜片，在LED光源前方的光线较亮处，光学膜片对应设置为凹口，避免光学膜片在此处产生聚光作用；另一方面，在相邻两个LED光源之间的光线较暗处，通过光学膜片的集光作用提升亮度，由此改善背光模组入光侧存在的亮暗分布不均的问题。
进一步的，由于胶框的遮光部遮挡了LED光源向光学膜片上对应的凹口发出的光线，避免了LED光源的光线直接进入光学膜片中，减少了背光模组漏光的机率，因此改善了背光模组在窄边框设计下的漏光问题，提升了背光模组和液晶显示面板的显示品质。
【附图说明】
图1是本发明背光模组的剖面结构示意图；
图2是本发明光学膜片与灯条的结构示意图
图3是本发明光学膜片的第一实施例的示意图；
图4是本发明光学膜片的第二实施例的示意图；
图5是本发明光学膜片的第三实施例的示意图；
图6是本发明液晶显示装置的结构示意图。
【具体实施方式】
下面结合附图和实施例对本发明进行详细说明。
图1是本发明背光模组的剖面结构示意图。如图1所示，背光模组100包括：导光板110、灯条120、光学膜片130以及胶框140。
其中，导光板110包括入光面111以及与入光面111相接的出光面112，灯条120设置于入光面111的一侧，且灯条120靠近入光面111的一侧间隔设置有多个LED光源121，光学膜片130设置于出光面112上。
图2是本发明中光学膜片130与灯条120对应设置的示意图，图3是本发明中光学膜片130的第一实施例的示意图。
请一并参阅图2和图3所示，光学膜片130靠近灯条120的侧边包括凹口131a、131b、131c、131d、131e…131n，凹口131a、131b、131c、131d、131e…131n是通过裁切光学膜片130形成。其中，多个凹口与多个LED光源一一对应设置，具体而言，凹口131a与LED光源121a对应设置，凹口131b与LED光源121b对应设置，凹口131c与LED光源121c对应设置，凹口131d与LED光源121d对应设置，凹口131e与LED光源121e对应设置，凹口131n与LED光源121n对应设置。其中，光学膜片130具有多个凸出部132，凸出部132位于两相邻的凹口之间，即：凸出部132与两相邻LED光源121之间的区域对应设置。
在本实施例中，凹口131a、131b、131c、131d、131e…131n为矩形。应理解，在本发明的其他实施例中，凹口131a、131b、131c、131d、131e…131n也可以是弧形（图4所示）或三角形（图5所示）。
在本实施例中，光学膜片130用于提高背光模组出射光线的亮度或均匀度，例如为扩散片（Diffuser）、棱镜片（Prism）或增亮片（DBEF, Dual Brightness Enhancement Film）。其中，扩散片主要功能为显示器提供一个均匀的面光源，其材料具有较高的光透过率。棱镜片是一种聚光装置，主要利用全反射和折射定律，将分散的光集中于一定的角度范围后出射，从而提高该角度范围内的亮度。增亮片是一种聚光装置，主要用于提高背光模组的出光面的亮度。
请再参阅图1所示，在本实施例中，胶框140包括本体部141、延伸部142以及遮光部143。本体部141与入光面111平行间隔设置，延伸部142从本体部141延伸至出光面112上方，遮光部143从延伸部142的底部朝向光学膜片130的方向延伸。具体而言，光学膜片130具有凹口的侧边位于延伸部142与出光面112之间，遮光部143朝向光学膜片130上的凹口延伸，且遮光部143远离延伸部142的端面30抵接于导光板110的出光面112上，光学膜片130的侧边的边缘与出光面112和入光面111相交处的边缘平齐(如图2所示)，遮光部143的端面145的形状与凹口131a、131b、131c、131d、131e…131n的形状相契合。
其中，遮光部143的材料可以是塑胶、聚乙烯对苯二甲酸脂、硅胶或微细孔聚合体材料等高光吸收率或是低光反射率的材料。遮光部143与本体141的结构可以是一体成型，其形成方式为射出成型或是其他适合的现有方式。
由于灯条120上的LED光源121前方的光线很亮，而相邻两个LED光源121之间的光线则较暗。对此，在本实施例中，在LED光源121前方的光线较亮处的光学膜片130对应设置为凹口，避免光学膜片130在此处产生的聚光作用；另一方面，在相邻两个LED光源121之间光线较暗处，通过光学膜片130上对应设置的凸出部132的集光作用可使得相邻两个LED光源121之间较暗处的亮度得以提升，由此可减小入光面111的亮暗差异，进而改善了出光面112上亮暗分布不均的问题。
同时，由于遮光部143的端面145的形状与凹口131a、131b、131c、131d、131e…131n的形状相契合，且延伸至抵接于导光板110的出光面112上，因此可遮挡LED光源121向对应的凹口发出的光线，避免了LED光源121发出的光线直接射入光学膜片130中，减少了入光面111漏光的机率。
图6是本发明液晶显示装置的结构示意图。如图6所示，液晶显示装置600中采用前述的背光模组100作为背光源，其进一步包括：背板610、液晶面板620以及前框630。
其中，导光板110设置于背板610上，液晶面板620设置于胶框140的延伸部142的顶面上。前框630与背板610组装，以使液晶面板620稳固夹持于前框630与胶框644之间。其中，前框630与背板610可以通过螺丝锁附或者设置卡扣结构实现固定。
如前所述，由于光学膜片130的侧边的边缘延伸至与出光面112和入光面111相交处的边缘平齐，且光学膜片130的凸出部132在组装时压持于胶框140的延伸部142与导光板110的出光面112之间，由此保证了光学膜片130在胶框140下伸入的长度，可有效避免光学膜片130从背光模组100中滑出。
综上所述，本发明通过使用依据LED光源的排布进行形状裁切的光学膜片，在LED光源前方的光线较亮处，光学膜片对应设置为凹口，避免光学膜片在此处产生聚光作用；另一方面，在相邻两个LED光源之间的光线较暗处，通过光学膜片的集光作用提升亮度，由此改善背光模组入光侧存在的亮暗分布不均的问题。
进一步的，由于胶框的遮光部遮挡了LED光源向光学膜片上对应的凹口发出的光线，避免了LED光源的光线直接进入光学膜片中，减少了背光模组漏光的机率，因此改善了背光模组在窄边框设计下的漏光问题，提升了背光模组和液晶显示面板的显示品质。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (13)

  1. 一种背光模组，其中，所述背光模组包括：
    导光板，包括入光面以及与所述入光面相接的出光面；
    灯条，设置于所述入光面的一侧，所述灯条靠近所述入光面的一侧间隔设置有多个LED光源；
    光学膜片，设置于所述出光面上，且所述光学膜片靠近所述灯条的侧边包括多个凹口，所述多个凹口与所述多个LED光源一一对应设置，且所述凹口为矩形、弧形或三角形；
    胶框，包括本体部、从所述本体部延伸至所述出光面上方的延伸部以及从所述延伸部的底部朝向所述凹口延伸的遮光部，所述光学膜片靠近所述灯条的所述侧边位于所述延伸部与所述出光面之间，且所述遮光部远离所述延伸部的端面抵接于所述导光板的出光面。
  2. 根据权利要求1所述的背光模组，其中，所述光学膜片为扩散片、棱镜片或增亮片，通过裁切所述光学膜片形成所述多个凹口。
  3. 根据权利要求1所述的背光模组，其中，所述光学膜片的所述侧边的边缘与所述出光面和所述入光面相交处的边缘平齐，所述遮光部的所述端面的形状与所述凹口的形状相契合。
  4. 一种背光模组，其中，所述背光模组包括：
    导光板，包括入光面以及与所述入光面相接的出光面；
    灯条，设置于所述入光面的一侧，所述灯条靠近所述入光面的一侧间隔设置有多个LED光源；
    光学膜片，设置于所述出光面上，且所述光学膜片靠近所述灯条的侧边包括多个凹口；
    其中，所述多个凹口与所述多个LED光源一一对应设置。
  5. 根据权利要求4所述的背光模组，其中，所述凹口为矩形、弧形或三角形。
  6. 根据权利要求5所述的背光模组，其中，所述光学膜片为扩散片、棱镜片或增亮片，通过裁切所述光学膜片形成所述多个凹口。
  7. 根据权利要求4所述的背光模组，其中，所述背光模组还包括胶框，所述胶框包括本体部、从所述本体部延伸至所述出光面上方的延伸部，所述光学膜片靠近所述灯条的所述侧边位于所述延伸部与所述出光面之间，其中，所述胶框还包括从所述延伸部的底部朝向所述凹口延伸的遮光部，且所述遮光部远离所述延伸部的端面抵接于所述导光板的出光面。
  8. 根据权利要求7所述的背光模组，其中，所述光学膜片的所述侧边的边缘与所述出光面和所述入光面相交处的边缘平齐，所述遮光部的所述端面的形状与所述凹口的形状相契合。
  9. 一种液晶显示装置，其中，所述液晶显示装置包括：
    背板；
    导光板，设置于所述背板上，其包括入光面以及与所述入光面相接的出光面；
    灯条，设置于所述入光面的一侧，所述灯条靠近所述入光面的一侧间隔设置有多个LED光源；
    光学膜片，设置于所述出光面上，且所述光学膜片靠近所述灯条的侧边具有多个凹口，所述多个凹口与所述多个LED光源一一对应设置；
    胶框，包括本体部、从所述本体部延伸至所述出光面上方的延伸部，所述光学膜片靠近所述灯条的所述侧边位于所述延伸部与所述出光面之间；
    液晶面板，设置于所述胶框上；
    前框，与所述背板组装，以使所述液晶面板稳固夹持于所述前框与所述胶框之间。
  10. 根据权利要求9所述的液晶显示装置，其中，所述凹口为矩形、弧形或三角形。
  11. 根据权利要求10所述的液晶显示装置，其中，所述光学膜片为扩散片、棱镜片或增亮片，通过裁切所述光学膜片形成所述多个凹口。
  12. 根据权利要求9所述的液晶显示装置，其中，所述胶框进一步包括从所述延伸部的底部朝向所述凹口延伸的遮光部，且所述遮光部的端面抵接于所述导光板的出光面。
  13. 根据权利要求12所述的液晶显示装置，其中，所述光学膜片的所述侧边的边缘与所述出光面和所述入光面相交处的边缘平齐，所述遮光部的所述端面的形状与所述凹口的形状相契合。
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