WO2013075348A1 - 背光模组及液晶显示器 - Google Patents

背光模组及液晶显示器 Download PDF

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Publication number
WO2013075348A1
WO2013075348A1 PCT/CN2011/083297 CN2011083297W WO2013075348A1 WO 2013075348 A1 WO2013075348 A1 WO 2013075348A1 CN 2011083297 W CN2011083297 W CN 2011083297W WO 2013075348 A1 WO2013075348 A1 WO 2013075348A1
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WIPO (PCT)
Prior art keywords
light
guide plate
incident side
distance
light source
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PCT/CN2011/083297
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English (en)
French (fr)
Inventor
康志聪
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深圳市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 filed Critical 深圳市华星光电技术有限公司
Priority to US13/380,894 priority Critical patent/US8970807B2/en
Publication of WO2013075348A1 publication Critical patent/WO2013075348A1/zh
Priority to US14/586,936 priority patent/US20150109819A1/en

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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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • 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

Definitions

  • the present invention relates to the field of liquid crystal production technologies, and in particular, to a backlight module and a liquid crystal display.
  • FIG. 1A-1B are partial structural views of a backlight module in the prior art.
  • FIG. 1A is a cross-sectional view of a backlight module, in a light emitting diode (Light Emitting)
  • the Diode LED 11
  • the coupling efficiency of the light emitted from the LED 11 must be considered, including the coupling efficiency of light from the LED 11 to the light guide plate (LGP) 12.
  • FIG. 1B is a side view of FIG. 1A.
  • the distance between the LED 11 and the light guide plate 12 is S1
  • all the light emitted by the LED 11 can enter the light guide plate 12.
  • the problem of the distance between the light ray between adjacent LEDs 11 and the distance of the LED 11 in the direction B1 of the vertical light guide plate 12 is also considered.
  • the light emitted by the LED 11 enters the light guide plate 12
  • the light emitted by one of the LEDs enters the light guide plate 12
  • the direction B1 of the light incident side of the vertical light guide plate 12 after a light mixing distance D1
  • the light rays emitted by the adjacent LEDs cross each other, so that the light emitted from the adjacent LEDs 11 forms a dark area 13 when intersecting, and there is no light in the dark area 13.
  • the material of the light guide plate 12 is generally polymethyl methacrylate (PMMA). Since the refractive index of the PMMA is greater than the refractive index of the air, the light emitted from the LED 11 enters the light guide plate 12 by the air, and the light is refracted toward the normal L direction. That is, the light incident angle ⁇ 1 of the light is larger than the light exit angle ⁇ 2, so that the light ray crossing point between the adjacent LEDs 11 and the distance (ie, the light mixing distance) D1 of the LED 11 in the direction B1 of the vertical light guide plate 12 become larger. If the light mixing distance D1 becomes large so that the dark area 13 appears in the visible area 14, the liquid crystal panel may appear to be mutually dark and bright.
  • PMMA polymethyl methacrylate
  • the dark area 13 is prevented from appearing in the visible area 14 in order to shorten the light mixing distance D1
  • the distance between the LEDs 11 and the light guide plate 12 is increased to S2, where S2>S1.
  • the path of the light in the direction B1 of the vertical light guide plate 12 becomes long, the light mixing distance becomes smaller than D2, wherein D2 ⁇ D1, the dark area 13 can be prevented from appearing in the visible area 14, but please refer to FIG. 2B, FIG. 2B.
  • the light emitted from the LED 11 cannot completely enter the light guide plate 12, so that the coupling efficiency of the light in the direction B1 of the vertical light guide plate 12 is lowered.
  • An object of the present invention is to provide a backlight module for reducing the distance between the intersection of light rays emitted by adjacent LEDs and the direction of the LEDs in the direction of the vertical light guide plate, so as to avoid dark regions formed when adjacent light rays of adjacent LEDs appear in the liquid crystal.
  • the display area of the panel ensures the quality of the screen display of the LCD panel.
  • Another object of the present invention is to provide a liquid crystal display including a backlight module including a light source and a light guide plate, the light guide plate including a light incident side, and the light emitted by the light source passes through the light incident light The side enters the light guide plate.
  • the present invention provides a backlight module including a light source and a light guide plate, the light guide plate includes a light incident side, the light guide plate has a first refractive index, and the light emitted by the light source passes through a medium and the light incident side. Entering the light guide plate, the medium has a third refractive index;
  • the distance between the light source and the light redirecting layer is a coupling distance, and the coupling distance is a preselected distance, so that all the light emitted by the light source enters the light redirecting layer;
  • a light redirecting layer is disposed on the light incident side, the light redirecting layer has a second refractive index, the second refractive index is smaller than the first refractive index and greater than the third refractive index;
  • the layer is used to change the direction of the light entering the light incident side to shorten the distance between the intersection of the light rays emitted by the adjacent light sources and the direction of the light source in the direction perpendicular to the light incident side.
  • the light redirecting layer is a transparent film, and the transparent film is made of silicon dioxide or calcium fluoride.
  • the transparent film is coated on the light incident side of the light guide plate.
  • Another object of the present invention is to provide a backlight module for reducing the distance between the intersection of light rays emitted by adjacent LEDs and the direction of the LEDs in the direction of the vertical light guide plate, so as to avoid dark regions formed when light rays of adjacent LEDs intersect.
  • the display area of the liquid crystal panel ensures the quality of the screen display of the liquid crystal panel.
  • the present invention provides a backlight module including a light source and a light guide plate, the light guide plate includes a light incident side, and the light emitted by the light source enters the light guide plate through the light incident side;
  • a light redirecting layer is disposed on the light incident side, and the light redirecting layer is configured to change a direction of light entering the light incident side to shorten an intersection of light rays emitted from adjacent light sources and the light source is perpendicular to the light source The distance in the direction of the light entering side.
  • the distance between the light source and the light redirecting layer is a coupling distance, and the coupling distance is a preselected distance, so that all the light emitted by the light source enters the light. To the layer.
  • the light guide plate has a first refractive index
  • the light emitted from the light source enters the light guide plate through a medium
  • the medium has a third refractive index
  • the light redirecting layer has a second refractive index, the second refractive index being less than the first refractive index and greater than the third refractive index.
  • the light redirecting layer is a transparent film, and the transparent film is made of silicon dioxide or calcium fluoride.
  • the transparent film is coated on the light incident side of the light guide plate.
  • It is still another object of the present invention to provide a liquid crystal display including a backlight module including a light source and a light guide plate, the light guide plate including a light incident side, and the light emitted by the light source passes through the light incident light Side entering the light guide plate;
  • a light redirecting layer is disposed on the light incident side, and the light redirecting layer is configured to change a direction of light entering the light incident side to shorten an intersection of light rays emitted from adjacent light sources and the light source is perpendicular to the light source The distance in the direction of the light entering side.
  • the distance between the light source and the light redirecting layer is a coupling distance, and the coupling distance is a preselected distance, so that all the light emitted by the light source enters the light redirecting direction.
  • Floor is a preselected distance
  • the light guide plate has a first refractive index
  • the light emitted from the light source enters the light guide plate through a medium
  • the medium has a third refractive index
  • the light redirecting layer has a first a second refractive index, the second refractive index being smaller than the first refractive index and greater than the third refractive index.
  • the light redirecting layer is a transparent film, and the transparent film is made of silicon dioxide or calcium fluoride.
  • the transparent film is coated on the light incident side of the light guide plate.
  • the present invention provides a light redirecting layer on the light incident side of the light guide plate, the refractive index of the light redirecting layer is smaller than the refractive index of the light guiding plate, and the light source and the refractive layer are The coupling distance between the two is a preselected distance. Light emitted from the light source enters the light guide plate after being refracted by the light redirecting layer.
  • the coupling distance is the preselected distance
  • the light emitted by the light source can all enter the light guide plate, which ensures the coupling efficiency of the light in the direction perpendicular to the light guide plate; and, through the refraction After the refraction of the layer, the intersection of the light rays emitted by the adjacent light sources and the distance of the light source in the direction perpendicular to the light incident side becomes shorter, so that dark regions formed when the light rays of adjacent light sources intersect can be effectively prevented from appearing at
  • the display area of the liquid crystal panel ensures the quality of the screen display of the liquid crystal panel.
  • 1A-1B are partial structural views of a backlight module in the prior art
  • FIGS. 1A-1B are schematic structural views of the distance between the LED and the light guide plate in FIGS. 1A-1B;
  • FIG. 3 is a schematic structural view of a backlight module according to a preferred embodiment of the present invention.
  • Figure 4 is a side view of Figure 3;
  • Figure 5 is a schematic view of the direction of light rays in Figure 3.
  • FIG 3 is a structural view of a preferred embodiment of a backlight module of the present invention.
  • the backlight module includes a light source 31 and a light guide plate 32.
  • the light guide plate 32 includes a light incident side 321 , and a light redirecting layer is disposed on the light incident side 321 .
  • the light redirecting layer is configured to change the direction of the light entering the light incident side to shorten the intersection of the light rays emitted by the adjacent light source 31 and the direction B1 of the light source 31 perpendicular to the light incident side 321 the distance.
  • the shortening referred to in this embodiment refers to the distance between the intersection of the light rays emitted by the adjacent light sources 31 in the direction B1 perpendicular to the light incident side 321 , which is reduced by a difference from the prior art, for example, by 2 mm. Please refer to the following for details.
  • the light redirecting layer is a refractive layer 33.
  • the light redirecting layer may also be a scattering layer, so as to change the direction of the light and shorten the intersection of the light emitted by the adjacent light source 31.
  • the distance in the direction B1 perpendicular to the light incident side 321 may be a point, and is not enumerated here.
  • the light source 31 is an LED, and of course other illuminants.
  • the refractive layer 33 is a transparent film, and the material of the transparent film is silicon dioxide or calcium fluoride.
  • the refractive layer 33 is attached to the light incident side 321 of the light guide plate 32. More preferably, the refractive layer 33 in the form of a transparent film is applied to the light incident side 321 of the light guide plate 32, of course. It can also be other connection methods, which are not listed here.
  • the light guide plate 32 has a first refractive index n1, and the refractive layer 33 has a second refractive index n2.
  • the light emitted by the light source 31 enters the light guide plate 32 through a medium, and the medium has a third refractive index.
  • the rate n3 is smaller than the first refractive index n1 and greater than the third refractive index n3.
  • the medium is air and has a refractive index of 1.0; the material of the light guide plate 32 is polymethyl methacrylate, the refractive index of the light guide plate 32 is 1.49; and when the material of the refractive layer 33 is dioxide In the case of silicon, the refractive index of the refractive layer 33 is 1.45.
  • the refractive layer 33 may be other materials as long as the second refractive index n2 of the refractive layer 33 is smaller than the first refractive index n1 of the light guide plate 32, which are not enumerated here.
  • the refractive index of the refractive layer 33 is folded to 1.45; when the material of the refractive layer 33 is calcium fluoride, the refractive index of the refractive layer 33 is 1.33. .
  • the distance between the light source 31 and the refractive layer 33 is a coupling distance, and the coupling distance is a preselected distance.
  • the coupling distance is S1 shown in FIG. 4
  • the light source is All of the light rays exiting 31 enter the refractive layer 33, thereby ensuring the light coupling efficiency of the light in the direction B1 perpendicular to the light incident side 321 .
  • the light emitted by the light source 31 reaches through the medium and enters the refractive layer 33. Since the second refractive index n2 of the refractive layer 33 is greater than the third refractive index n3 of the medium, after entering the refractive layer 33, the light will change in a direction biased toward the first normal line L2 and enter the refractive layer. 33. That is, the first incident angle ⁇ 3 of the light is greater than the second incident angle ⁇ 4 of the light entering the light guide plate from the refractive layer 33.
  • the light entering the refracting layer 33 continues into the light guide plate 32. Since the second refractive index n2 of the refracting layer 33 is smaller than the first refractive index n1 of the light guide plate 32, the light enters the light guide plate 32. Will be biased towards the second normal L3. Therefore, the second incident angle ⁇ 4 of the light entering the light guide plate 32 is greater than the second exit angle ⁇ 5.
  • the present embodiment first passes the refracting layer 33 having a refractive index smaller than the refractive index of the light guide plate 12 to the light before entering the light guide plate 32.
  • the present invention can effectively prevent the dark region 34 formed by the light of the adjacent light source 31 from appearing in the display region 35 of the liquid crystal panel, and can also Maintaining the coupling distance of S1, the light emitted by the light source 31 enters the refractive layer 33, ensuring the coupling efficiency of the light in the direction B1 perpendicular to the light incident side 321 , thereby ensuring the screen display of the liquid crystal panel. quality.
  • the present embodiment since the distance of the intersection of the light rays emitted from the adjacent light sources 31 in the direction B1 perpendicular to the light incident side 321 becomes shorter than D3, even the distance between the adjacent light sources 31 is obtained. D4 is increased, and it is also possible to prevent the dark region 34 formed by the light of the adjacent light source 31 from appearing in the display region 35 of the liquid crystal panel, so that the present invention can reduce the number of the light sources 31, thereby saving cost. .
  • the present embodiment can be significantly larger than the visible area 14 of the prior art. Increasing the area of the visible area 35, that is, even if the thickness D5 required for the light-retaining frame design of the light guide plate 32 is reduced, the formation of the light of the adjacent light source 31 at the intersection can be avoided.
  • the dark area 34 appears in the display area 35 of the liquid crystal panel, thereby realizing the design of the narrow bezel, thereby reducing the volume of the liquid crystal panel and saving cost.
  • the present invention also provides a liquid crystal display comprising the backlight module provided by the present invention. Since the backlight module has been described in detail above, it will not be described herein.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

一种背光模组，包括光源（31）和导光板（32），所述导光板（32）包括入光侧（321），所述光源（31）出射的光线通过所述入光侧（321）进入所述导光板（32），所述入光侧（321）设置一光线变向层（33），所述光线变向层（33）用于改变进入所述入光侧（321）的光线方向，以缩短相邻光源（31）出射的光线的交叉点与所述光源（31）在垂直所述入光侧面方向上的距离。还披露了一种液晶显示器。

Description

背光模组及液晶显示器 技术领域
本发明涉及液晶生产技术领域，尤其涉及一种背光模组及液晶显示器。
 背景技术
随着液晶显示器的不断普及，对液晶显示功能的要求越来越高。
图1A-1B为现有技术中背光模组的部分结构图。请参阅图1A，图1A为背光模组的剖视图，在对发光二极管（Light Emitting Diode，LED）11与导光板12进行设置时，必须考虑LED11出射光线的耦合（coupling）效率，包括从LED11到导光板（LGP）12之间的光线的耦合效率。譬如请参阅图1B，图1B为图1A的侧视图，LED11与导光板12的距离为S1时，LED11出射的光线能全部进入导光板12。
同样，还需考虑相邻LED11间的光线交叉点与LED11在垂直导光板12方向B1的距离的问题。譬如在图1A中，LED11出射的光线进入导光板12后，其中一LED出射的光线进入导光板12后，在垂直导光板12的入光侧的方向B1上，经一混光距离D1后与相邻的LED出射的光线交叉，因此相邻LED11出射的光线在交叉时会形成一暗区13，在该暗区13内不存在光线。
导光板12的材质一般为聚甲基丙烯酸甲酯（PMMA），由于PMMA的折射率大于空气的折射率，因此LED11出射的光线由空气进入导光板12后，光线会向法线L方向折射，即光线的入光角度θ1大于出光角度θ2，导致相邻LED11间的光线交叉点与LED11在垂直导光板12方向B1的距离（即混光距离）D1变大。如果混光距离D1变大到使得暗区13出现在可视区域14，则会导致液晶面板出现画面互暗互亮的现象。
若为了缩短混光距离D1，避免暗区13出现在可视区域14，通常可行的办法是将LED11到导光板12之间的混光距离增大。譬如请参阅图2A，将LED11到导光板12之间的距离增大至S2，其中S2>S1。虽然光线在垂直导光板12方向B1的路径变长，会使得混光距离变小为D2，其中D2<D1，可以避免暗区13出现在可视区域14，但是，请参阅图2B，图2B为图2A的侧视图，从LED11出射的光线不能完全进入导光板12，使得光线在垂直导光板12方向B1的耦合效率下降。
综上，如何减小相邻LED出射的光线交叉点与LED在垂直导光板方向的距离，以避免相邻LED的光线交叉时形成的暗区出现在液晶面板的显示区域，进而保证液晶面板的画面显示质量，是液晶生产技术领域研究的方向之一。
 技术问题
本发明的一个目的在于提供一种背光模组，以减小相邻LED出射的光线交叉点与LED在垂直导光板方向的距离，以避免相邻LED的光线交叉时形成的暗区出现在液晶面板的显示区域，进而保证液晶面板的画面显示质量。
本发明的另一个目的在于提供一种液晶显示器，所述液晶显示器包括一种背光模组，包括光源和导光板，所述导光板包括入光侧，所述光源出射的光线通过所述入光侧进入所述导光板。
 技术解决方案
本发明构造了一种背光模组，包括光源和导光板，所述导光板包括入光侧，所述导光板具有第一折射率，所述光源出射的光线经一介质及所述入光侧进入所述导光板，所述介质具有第三折射率；
所述光源与所述光线变向层的距离为一耦光距离，所述耦光距离为一预选距离，使所述光源出射的光线全部进入所述光线变向层；
所述入光侧设置一光线变向层，所述光线变向层具有第二折射率，所述第二折射率小于所述第一折射率且大于所述第三折射率；所述光线变向层用于改变进入所述入光侧的光线方向，以缩短相邻光源出射的光线的交叉点与所述光源在垂直所述入光侧的方向上的距离。
在本发明的背光模组中，所述光线变向层为一透明膜，所述透明膜的材料为二氧化硅或者氟化钙。
在本发明的背光模组中，所述透明膜涂覆于所述导光板的入光侧。
本发明的另一个目的在于提供一种背光模组，以减小相邻LED出射的光线交叉点与LED在垂直导光板方向的距离，以避免相邻LED的光线交叉时形成的暗区出现在液晶面板的显示区域，进而保证液晶面板的画面显示质量。
为达到上述有益效果，本发明构造了一种背光模组，包括光源和导光板，所述导光板包括入光侧，所述光源出射的光线通过所述入光侧进入所述导光板；
所述入光侧设置一光线变向层，所述光线变向层用于改变进入所述入光侧的光线方向，以缩短相邻光源出射的光线的交叉点与所述光源在垂直所述入光侧的方向上的距离。
在本发明的背光模组中，所述光源与所述光线变向层的距离为一耦光距离，所述耦光距离为一预选距离，使所述光源出射的光线全部进入所述光线变向层。
在本发明的背光模组中，所述导光板具有第一折射率，所述光源出射的光线经一介质进入所述导光板，所述介质具有第三折射率；所述光线变向层具有第二折射率，所述第二折射率小于所述第一折射率且大于所述第三折射率。
在本发明的背光模组中，所述光线变向层为一透明膜，所述透明膜的材料为二氧化硅或者氟化钙。
在本发明的背光模组中，所述透明膜涂覆于所述导光板的入光侧。
本发明的还一个目的在于提供一种液晶显示器，所述液晶显示器包括一种背光模组，包括光源和导光板，所述导光板包括入光侧，所述光源出射的光线通过所述入光侧进入所述导光板；
所述入光侧设置一光线变向层，所述光线变向层用于改变进入所述入光侧的光线方向，以缩短相邻光源出射的光线的交叉点与所述光源在垂直所述入光侧的方向上的距离。
在本发明的液晶显示器中，所述光源与所述光线变向层的距离为一耦光距离，所述耦光距离为一预选距离，使所述光源出射的光线全部进入所述光线变向层。
在本发明的液晶显示器中，所述导光板具有第一折射率，所述光源出射的光线经一介质进入所述导光板，所述介质具有第三折射率；所述光线变向层具有第二折射率，所述第二折射率小于所述第一折射率，且大于所述第三折射率。
在本发明的液晶显示器中，所述光线变向层为一透明膜，所述透明膜的材料为二氧化硅或者氟化钙。
在本发明的液晶显示器中，所述透明膜涂覆于所述导光板的入光侧。
 有益效果
本发明相对于现有技术，通过在导光板的入光侧设置一光线变向层，所述光线变向层的折射率小于所述导光板的折射率，且使得光源和所述折射层之间的耦光距离为一预选距离。从所述光源出射的光线经过所述光线变向层的折射后进入所述导光板。由于所述耦光距离为该预选距离，能使所述光源出射的光线能全部进入所述导光板，很好的保证了光线在垂直所述导光板方向的耦合效率；而且，经过所述折射层的折射后，相邻光源出射的光线的交叉点与所述光源在垂直所述入光侧面方向上的距离变短，因此可以有效地避免相邻光源的光线交叉时形成的暗区出现在液晶面板的显示区域，进而保证了液晶面板的画面显示质量。
 附图说明
图1A-1B为现有技术中背光模组的部分结构示意图；
图2A-2B为图1A-1B中改变LED和导光板之间的距离后的结构示意图；
图3为本发明中背光模组的较佳实施例结构示意图；
图4为图3的侧视图；
图5为图3中光线走向示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。
图3为本发明中背光模组的较佳实施例的结构图。
所述背光模组包括光源31和导光板32，所述导光板32包括入光侧321，所述入光侧321处设置一光线变向层。其中，所述光线变向层用于改变进入所述入光侧的光线方向，以缩短相邻光源31出射的光线的交叉点与所述光源31在垂直所述入光侧321的方向B1上的距离。
其中，本实施例所指的缩短，是指相邻光源31出射的光线的交叉点在垂直所述入光侧321的方向B1上的距离，相对现有技术减少一差值，譬如减少2毫米，具体请参阅下文。
作为一优选实施例，所述光线变向层为一折射层33，当然，所述光线变向层也可以为散射层，只要使得光线方向发生变化，并缩短相邻光源31出射的光线的交叉点在垂直所述入光侧321的方向B1上的距离即可，此处不一一列举。
优选的，所述光源31为LED，当然也可以是其它的发光体。所述折射层33为一透明膜，所述透明膜的材料为二氧化硅或者氟化钙。
在具体实施过程中，所述折射层33贴合所述导光板32的入光侧321，更优选的，透明膜形式的折射层33涂覆于所述导光板32的入光侧321，当然也可以是其它的连接方式，此处不一一列举。
其中，所述导光板32具有第一折射率n1，所述折射层33具有第二折射率n2，所述光源31出射的光线经一介质进入所述导光板32，所述介质具有第三折射率n3，所述第二折射率n2小于所述第一折射率n1且大于所述第三折射率n3。
譬如，介质为空气，其折射率为1.0；所述导光板32的材料为聚甲基丙烯酸甲酯，所述导光板32的折射率为1.49；而当所述折射层33的材料为二氧化硅时，所述折射层33的折射率为1.45。当然，所述折射层33也可以是其它的材料，只要使得所述折射层33的第二折射率n2小于所述导光板32的第一折射率n1即可，此处不一一列举。
譬如，所述折射层33的材料为二氧化硅时，所述折射层33的折射率折为1.45；所述折射层33的材料为氟化钙时，所述折射层33的折射率为1.33。
请参阅图4，所述光源31与所述折射层33的距离为耦光距离，所述耦光距离为一预选距离，在所述耦光距离为图4所示的S1时，所述光源31出射的光线全部进入所述折射层33，进而保证了光线在垂直所述入光侧321的方向B1上的耦光效率。
本发明提供的背光模组的较佳实施例工作原理为：
请一并参阅图3、图4和图5，所述光源31出射的光线通过介质到达并进入所述折射层33。由于所述折射层33的第二折射率n2大于所述介质的第三折射率n3，因此光线进入所述折射层33后，将沿偏向第一法线L2的方向变化后进入所述折射层33。亦即，光线的第一入射角θ3大于光线从所述折射层33进入所述导光板的第二入射角θ4。
进入所述折射层33的光线继续进入所述导光板32，由于所述折射层33的第二折射率n2小于所述导光板32的第一折射率n1，光线进入所述导光板32后，将偏向第二法线L3。因此所述光线进入所述导光板32的第二入射角θ4大于第二出射角θ5。
显然，与图1所示的光线直接折射进入导光板12相比，本实施例在光线进入所述导光板32之前，首先通过一折射率小于所述导光板12折射率的折射层33对光线进行折射，由于所述光源31和所述折射层33之间同时还保持一耦光距离S1，因此，光线经所述折射层33折射后，再进入所述导光板32，明显地缩短相邻光源31出射的光线的交叉点与所述光源31在垂直所述入光侧321的方向B1上的距离为D3，本实施例中的混光距离为D3小于图1所示的混光距离D1，即D3<D1，两者的差值为D1-D3，因此本发明可以有效的避免相邻光源31的光线在交叉时形成的暗区34出现在液晶面板的显示区域35内，同时亦能维持耦光距离为S1，使所述光源31出射的光线全部进入所述折射层33，保证了光线在垂直所述入光侧321的方向B1上的耦光效率，进而保证液晶面板的画面显示质量。
而且，在本实施例中，由于相邻光源31出射的光线的交叉点在垂直所述入光侧321的方向B1上的距离变短为D3，因此即便是将相邻光源31之间的距离D4增大，也可以避免相邻光源31的光线在交叉时形成的所述暗区34出现在液晶面板的所述显示区域35内，因此本发明可以减少所述光源31的数目，从而节省成本。
而且，由于相邻光源31出射的光线的交叉点在垂直所述入光侧321的方向B1上的距离变短为D3，因此相较于现有技术的可视区域14，本实施例可大幅增加所述可视区域35的面积，亦即，即便是将所述导光板32的保证混光边框设计要求的厚度D5减小，同样可以避免相邻光源31的光线在交叉时形成的所述暗区34出现在液晶面板的所述显示区域35，从而实现了窄边框的设计，进而减少液晶面板的体积，并节省了成本。
本发明还提供一种液晶显示器，所述液晶显示器包括本发明提供的背光模组，鉴于该背光模组在上文已有详细的描述，此处不再赘述。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
序列表自由内容

Claims (13)

  1. 一种背光模组，包括光源和导光板，所述导光板包括入光侧，所述导光板具有第一折射率，所述光源出射的光线经一介质及所述入光侧进入所述导光板，所述介质具有第三折射率，其特征在于：
    所述光源与所述光线变向层的距离为一耦光距离，所述耦光距离为一预选距离，使所述光源出射的光线全部进入所述光线变向层；
    所述入光侧设置一光线变向层，所述光线变向层具有第二折射率，所述第二折射率小于所述第一折射率且大于所述第三折射率；所述光线变向层用于改变进入所述入光侧的光线方向，以缩短相邻光源出射的光线的交叉点与所述光源在垂直所述入光侧的方向上的距离。
  2. 根据权利要求1所述的背光模组，其特征在于，所述光线变向层为一透明膜，所述透明膜的材料为二氧化硅或者氟化钙。
  3. 根据权利要求2所述的背光模组，其特征在于，所述透明膜涂覆于所述导光板的入光侧。
  4. 一种背光模组，包括光源和导光板，所述导光板包括入光侧，所述光源出射的光线通过所述入光侧进入所述导光板，其特征在于：
    所述入光侧设置一光线变向层，所述光线变向层用于改变进入所述入光侧的光线方向，以缩短相邻光源出射的光线的交叉点与所述光源在垂直所述入光侧的方向上的距离。
  5. 根据权利要求4所述的背光模组，其特征在于，所述光源与所述光线变向层的距离为一耦光距离，所述耦光距离为一预选距离，使所述光源出射的光线全部进入所述光线变向层。
  6. 根据权利要求4所述的背光模组，所述导光板具有第一折射率，所述光源出射的光线经一介质进入所述导光板，所述介质具有第三折射率，其特征在于：
    所述光线变向层具有第二折射率，所述第二折射率小于所述第一折射率且大于所述第三折射率。
  7. 根据权利要求6所述的背光模组，其特征在于，所述光线变向层为一透明膜，所述透明膜的材料为二氧化硅或者氟化钙。
  8. 根据权利要求7所述的背光模组，其特征在于，所述透明膜涂覆于所述导光板的入光侧。
  9. 一种液晶显示器，其特征在于，所述液晶显示器包括一种背光模组，包括光源和导光板，所述导光板包括入光侧，所述光源出射的光线通过所述入光侧进入所述导光板；
    所述入光侧设置一光线变向层，所述光线变向层用于改变进入所述入光侧的光线方向，以缩短相邻光源出射的光线的交叉点与所述光源在垂直所述入光侧的方向上的距离。
  10. 根据权利要求9所述的液晶显示器，其特征在于，所述光源与所述光线变向层的距离为一耦光距离，所述耦光距离为一预选距离，使所述光源出射的光线全部进入所述光线变向层。
  11. 根据权利要求9所述的液晶显示器，所述导光板具有第一折射率，所述光源出射的光线经一介质进入所述导光板，所述介质具有第三折射率，其特征在于：
    所述光线变向层具有第二折射率，所述第二折射率小于所述第一折射率，且大于所述第三折射率。
  12. 根据权利要求11所述的液晶显示器，其特征在于，所述光线变向层为一透明膜，所述透明膜的材料为二氧化硅或者氟化钙。
  13. 根据权利要求12所述的液晶显示器，其特征在于，所述透明膜涂覆于所述导光板的入光侧。
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