WO2013143162A1 - 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
WO2013143162A1
WO2013143162A1 PCT/CN2012/073636 CN2012073636W WO2013143162A1 WO 2013143162 A1 WO2013143162 A1 WO 2013143162A1 CN 2012073636 W CN2012073636 W CN 2012073636W WO 2013143162 A1 WO2013143162 A1 WO 2013143162A1
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WIPO (PCT)
Prior art keywords
light
guide plate
backlight module
angle
light guide
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PCT/CN2012/073636
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English (en)
French (fr)
Inventor
方扩军
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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 US13/511,657 priority Critical patent/US9110199B2/en
Publication of WO2013143162A1 publication Critical patent/WO2013143162A1/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
    • G02B6/0013—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
    • 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
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough 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
    • G02B6/0066—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
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a backlight module and a liquid crystal display.
  • the required light-emitting diode (Light Emitting) Diode, LED) is getting fewer and fewer.
  • the number of LEDs is reduced, resulting in an increase in the distance P' between the LEDs.
  • the density of the light guide plate 12' is different from the air density, it is generally smaller than the air density, and thus the light is refracted.
  • the liquid crystal display has a hotspot phenomenon.
  • An object of the present invention is to provide a backlight module for solving the problem that the vertical incident light entering the light guide plate and the light concentrated around the normal incident light enter the light guide plate in the prior art, and are concentratedly distributed in the light guide plate.
  • the light guide plate has a technical problem of uneven brightness and darkness.
  • Another object of the present invention is to provide a liquid crystal display to solve the problem that the vertical incident light entering the light guide plate and the light concentrated around the normal incident light enter the light guide plate in the prior art, and are concentratedly distributed in the light guide plate.
  • the light guide plate has a technical problem of uneven brightness and darkness.
  • the present invention is directed to a backlight module comprising a light source and a light guide plate, the light guide plate comprising a light incident surface on one side, the light source being close to the light incident surface, wherein:
  • the light guide plate is provided with a hollow hollow structure, and the hollow structure corresponds to the light source, and includes a first reflective surface, a second reflective surface and a third reflective surface disposed along a thickness direction of the light guide plate;
  • the first reflective surface is at a first oblique angle along a direction perpendicular to the light incident direction of the light incident surface between the light source and the light guide plate; the second reflective surface is along the vertical light incident direction The direction is at a second inclination angle, and the inclination direction of the first inclination angle and the second inclination angle are opposite; the light entering the light guide plate along the vertical light entrance direction has a refractive angle, the first inclination The sum of the angle and the angle of refraction is less than or equal to 45 degrees;
  • the light source corresponding to the light-emitting structure corresponding to the light-emitting structure is reflected by the first reflective surface, and the light source corresponding to the hollow structure is at the second tilt angle. Light rays directed to the second reflecting surface are reflected by the second reflecting surface.
  • the sum of the second tilt angle and the angle of refraction is less than or equal to 45 degrees.
  • the maximum distance of the third reflecting surface relative to the light incident surface of the light guide plate is smaller than the light mixing distance of the backlight module
  • the hollow structure has a hollow length along the vertical light entrance direction, and the hollow length is smaller than a light mixing distance of the backlight module.
  • the third reflecting surface is a flat surface.
  • the third reflecting surface is a curved surface.
  • the third reflecting surface is a circular arc surface
  • an angle between the vertical light incident direction and a tangent to any point on the circular arc surface is smaller than the first tilt angle.
  • an angle between the vertical light incident direction and a tangent to any point on the circular arc surface is smaller than the second oblique angle.
  • the hollow structure has a hollow depth D along the thickness direction of the light guide plate, and the third reflective surface has a shortest distance L with the mixed light of the backlight module.
  • a minimum exit opening angle ⁇ of the hollow structure in the mixed light, the hollow depth, the shortest distance, and the minimum exit opening angle ⁇ satisfy the following formula:
  • nLGP is the refractive index of the light guide plate.
  • Another object of the present invention is to provide a backlight module to solve the problem that the vertical incident light entering the light guide plate and the light concentrated around the normal incident light enter the light guide plate in the prior art, and are concentratedly distributed in the light guide plate.
  • the light guide plate has a technical problem of uneven brightness and darkness.
  • the present invention is directed to a backlight module including a light source and a light guide plate, the light guide plate includes a light incident surface on one side, and the light source is adjacent to the light incident surface;
  • the light guide plate is provided with a hollow hollow structure, and the hollow structure corresponds to the light source, and includes a first reflective surface and a second reflective surface disposed along a thickness direction of the light guide plate;
  • the first reflective surface is at a first oblique angle along a direction perpendicular to the light incident direction of the light incident surface between the light source and the light guide plate;
  • the second reflective surface is along the vertical light incident direction The direction is at a second inclination angle, and the inclination direction of the first inclination angle and the second inclination angle is opposite;
  • the light source corresponding to the light-emitting structure corresponding to the light-emitting structure is reflected by the first reflective surface, and the light source corresponding to the hollow structure is at the second tilt angle. Light rays directed to the second reflecting surface are reflected by the second reflecting surface.
  • the light entering the light guide plate along the vertical light entrance direction has a refractive angle, and the sum of the first oblique angle and the refractive angle is less than or equal to 45 degrees.
  • the sum of the second tilt angle and the angle of refraction is less than or equal to 45 degrees.
  • the hollow structure further includes a third reflective surface; a maximum distance of the third reflective surface relative to the light incident surface of the light guide plate is smaller than a light mixing distance of the backlight module;
  • the hollow structure has a hollow length along the vertical light entrance direction, and the hollow length is smaller than a light mixing distance of the backlight module.
  • the third reflecting surface is a flat surface.
  • the third reflecting surface is a curved surface.
  • the third reflecting surface is a circular arc surface
  • an angle between the vertical light incident direction and a tangent to any point on the circular arc surface is smaller than the first tilt angle.
  • an angle between the vertical light incident direction and a tangent to any point on the circular arc surface is smaller than the second oblique angle.
  • the hollow structure has a hollow depth D along the thickness direction of the light guide plate, and the third reflective surface has a shortest distance L with the mixed light of the backlight module.
  • a minimum exit opening angle ⁇ of the hollow structure in the mixed light, the hollow depth, the shortest distance, and the minimum exit opening angle ⁇ satisfy the following formula:
  • nLGP is the refractive index of the light guide plate.
  • Still another object of the present invention is to provide a liquid crystal display to solve the problem that the vertical incident light entering the light guide plate and the light concentrated around the normal incident light enter the light guide plate in the prior art, and are concentratedly distributed in the light guide plate.
  • the light guide plate has a technical problem of uneven brightness and darkness.
  • the present invention is a liquid crystal display including a backlight module, the backlight module includes a light source and a light guide plate, and the light guide plate includes a light incident surface on one side, and the light source is adjacent to the light input.
  • the light guide plate is provided with a hollow hollow structure, and the hollow structure corresponds to the light source, and includes a first reflective surface and a second reflective surface disposed along a thickness direction of the light guide plate;
  • the first reflective surface is at a first oblique angle along a direction perpendicular to the light incident direction of the light incident surface between the light source and the light guide plate;
  • the second reflective surface is along the vertical light incident direction The direction is at a second inclination angle, and the inclination direction of the first inclination angle and the second inclination angle is opposite;
  • the light source corresponding to the light-emitting structure corresponding to the light-emitting structure is reflected by the first reflective surface, and the light source corresponding to the hollow structure is at the second tilt angle. Light rays directed to the second reflecting surface are reflected by the second reflecting surface.
  • the present invention provides a hollow hollow structure inside the light guide plate, and the hollow structure corresponds to a light source, and the hollow structure reflects the normal incident light and the light concentrated around the normal incident light to make the partial light. It has a scattering effect and avoids concentrated distribution in a certain area of the light guide plate to avoid uneven brightness and darkness.
  • FIG. 1 is a schematic structural view of a backlight module in the prior art
  • FIG. 2 is a schematic structural view of a first preferred embodiment of a backlight module according to the present invention
  • Figure 3 is a top plan view of Figure 2;
  • Figure 4 is a side view of the structure of Figure 2;
  • FIG. 5 is a top plan view of a second preferred embodiment of a backlight module of the present invention.
  • FIG. 2 is a schematic structural view of a first preferred embodiment of a backlight module according to the present invention.
  • the backlight module includes a light source 10 and a light guide plate 20, and the light guide plate 20 includes a light incident surface 21, and a hollow hollow structure 22 is disposed in the light guide plate 20.
  • the hollow structure 22 includes a first reflective surface 221, a second reflective surface 222, and a third reflective surface 223 disposed along the thickness direction C (ie, the longitudinal direction) of the light guide plate 20.
  • FIG. 3 is a top view of one of the hollow structures 22 of FIG.
  • the first reflective surface 221 has a first tilt angle ⁇ 1 at the first Under the oblique angle ⁇ 1, the light of the light source 10 corresponding to the hollow structure 22 is reflected by the first reflective surface 221; the second reflective surface 222 has a second tilt angle ⁇ 2. Under the second tilt angle ⁇ 2, the light emitted by the light source 10 corresponding to the hollow structure 22 toward the second reflective surface 222 is reflected by the second reflective surface 222.
  • the inclination directions of the first inclination angle ⁇ 1 and the second inclination angle ⁇ 2 are opposite. Specifically, the first inclination angle ⁇ 1 rotates in a counterclockwise direction, and the second inclination angle ⁇ 2 rotates in a clockwise direction.
  • the light entering the light guide plate 20 along the vertical light incident direction A has a refraction angle ⁇ LGP (not shown, see FIG. 1), and the sum of the first tilt angle ⁇ 1 and the refraction angle ⁇ LGP Less than or equal to 45 degrees, ie:
  • the first reflecting surface 221 can reflect the received light.
  • the light is from the light source 10 corresponding to the hollow structure 22.
  • the light is a horizontally perpendicular incident light directed toward the hollow structure 22 and concentrates the light around the normally incident light.
  • the scattering effect continues along the direction A. Advancing, so that the distribution of the light above the light guide plate 20 is excessively concentrated, thereby avoiding the phenomenon of uneven brightness and darkness of the liquid crystal display.
  • the sum of the second inclination angle ⁇ 2 and the refraction angle ⁇ LGP is less than or equal to 45 degrees, that is:
  • the second reflecting surface 222 can reflect the received light.
  • the light is from the light source 10 corresponding to the hollow structure 22.
  • the light is a normal incident light that is directed toward the hollow structure 22 and a light that is concentrated around the normally incident light.
  • the scattering effect continues to be vertically
  • the light direction A advances, so that the distribution of the light rays on the light guide plate 20 is prevented from being excessively concentrated, thereby avoiding the phenomenon that the liquid crystal display is uneven in brightness and darkness.
  • the third reflecting surface 223 is preferably a flat surface, and the hollow structure 22 has a triangular cross-sectional structure on the horizontal plane B of the light guide plate 20 (refer to FIG. 3 ).
  • the third reflecting surface 223 can also be a curved surface, such as a circular arc surface.
  • the angle between the tangent of any point of the circular arc surface and the vertical light incident direction A is smaller than the first inclined angle ⁇ 1 or less than the plane in the top view of the horizontal plane B.
  • the second tilt angle ⁇ 2 is described. For example, the angle between the tangent to a point on the third reflecting surface 223 on the side close to the first reflecting surface 221 and the vertical light incident direction A is smaller than the first tilt angle ⁇ 1.
  • the third reflecting surface 223 is a flat surface.
  • the maximum distance (not shown) of the third reflecting surface 223 relative to the light incident surface 21 of the light guide plate 20 is smaller than the light mixing distance d of the backlight module, and the hollow structure 22 is along the vertical light entering direction A.
  • FIG. 4 is a side view of the first preferred embodiment of the backlight module shown in FIG. 2.
  • the hollow structure 22 has a hollow depth D along the thickness direction C of the light guide plate 20, and the mixed light ray Q of the third reflective surface 223 and the backlight module (ie, the line where the light rays of adjacent light sources intersect) Having a shortest distance L, a minimum exit opening angle ⁇ of the hollow structure 22 at the mixed ray Q, the hollow depth D, the shortest distance L, and the minimum exit opening angle ⁇ satisfy the following formula:
  • nLGP is the refractive index of the light guide plate 20.
  • the hollow depth D, the shortest distance L, and the minimum exit opening angle ⁇ satisfy the above formula, and can effectively prevent the hollow structure 22 from being seen along the direction of the minimum exit opening angle ⁇ , further ensuring the luminous effect.
  • the hollow depth D is smaller than the thickness of the light guide plate 20 (not shown). In a specific implementation process, the hollow depth D may also be equal to the thickness of the light guide plate 20, which is not enumerated here.
  • the plurality of hollow structures 22 are arranged at equal intervals along the horizontal plane B, and the distance P between the adjacent hollow structures 22 satisfies the following formula:
  • FIG. 5 is a top structural view of a second preferred embodiment of the backlight module of the present invention.
  • the third reflecting surface 223 is a folded surface.
  • the third reflecting surface 223 is a curved surface
  • the brightness of the curved surface of the third reflecting surface 223 can be changed to achieve uneven brightness and darkness, so as to reduce the occurrence of uneven brightness and darkness. Said.
  • 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.
  • the invention provides a hollow hollow structure inside the light guide plate, the hollow structure corresponding to the light source, the hollow structure reflects the normal incident light and the light concentrated around the normal incident light, so that the partial light is scattered to avoid concentrated distribution. In a certain area of the light guide plate, avoid the phenomenon of uneven brightness.

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

Abstract

一种背光模组及液晶显示器。背光模组的导光板（20）内部设置镂空结构（22），包括第一反射面（221）和第二反射面（222）。第一反射面（221）呈第一倾斜角度（β1），第二反射面（222）呈第二倾斜角度（β2）。在第一倾斜角度（β1）下，射向该第一反射面（221）的光线被第一反射面（221）反射。在第二倾斜角度（β2）下，射向该第二反射面（222）的光线被第二反射面（222）反射。该镂空结构使光线呈散射效果，避免出现亮暗不均的现象。

Description

背光模组及液晶显示器 技术领域
本发明涉及液晶显示技术领域，特别是涉及一种背光模组及液晶显示器。
 背景技术
随着液晶显示屏轻薄化发展的趋势，其所需的发光二极管（Light Emitting Diode，LED）颗数越来越少。
请参阅图1，在侧入光式LED背光模组中，LED颗数减小，导致LED之间距离P'增加。从LED11'出射的光线进入导光板12'后，由于导光板12'密度与空气密度不一样，一般小于空气密度，因此会对光线产生折射作用。
从LED11'出射的光线，有一部分垂直进入所述导光板12'，该部分垂直入射光线的张角为θair= 90度。该部分光线进入所述导光板12'后，张角发生变化，变为θLGP=arcsin(1/nLGP)，显然θLGP＜90°。
而对于集中在该部分垂直入射光线周围的光线而言，θLGP越小，在背光模组的混光距离d不变情况下，将会导致该部分光线集中分布在导光板12'中的某一范围内，进而导致液晶显示器出现亮暗不均（hotspot）现象。
如何解决现有技术中进入所述导光板的垂直入射光线以及集中在该垂直入射光线周围的光线进入导光板后，集中分布在导光板中的某一范围内，使得导光板存在亮暗不均现象的技术问题，是液晶显示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，以解决现有技术中进入所述导光板的垂直入射光线以及集中在该垂直入射光线周围的光线进入导光板后，集中分布在导光板中的某一范围内，使得导光板存在亮暗不均现象的技术问题。
本发明的另一个目的在于提供一种液晶显示器，以解决现有技术中进入所述导光板的垂直入射光线以及集中在该垂直入射光线周围的光线进入导光板后，集中分布在导光板中的某一范围内，使得导光板存在亮暗不均现象的技术问题。
 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，所述导光板包括位于一侧的入光面，所述光源靠近所述入光面，其中：
所述导光板内部设置有中空的镂空结构，所述镂空结构对应所述光源，包括有沿着所述导光板厚度方向设置的第一反射面、第二反射面以及第三反射面；
所述第一反射面沿着所述光源与所述导光板之间水平垂直于所述入光面的垂直入光方向呈第一倾斜角度；所述第二反射面沿着所述垂直入光方向呈第二倾斜角度，所述第一倾斜角度和所述第二倾斜角度的倾斜方向相反；沿着所述垂直入光方向进入所述导光板的光线具有一折射角度，所述第一倾斜角度与该折射角度之和小于等于45度；
在所述第一倾斜角度下，所述镂空结构对应的光源射向该第一反射面的光线被所述第一反射面反射；在所述第二倾斜角度下，所述镂空结构对应的光源射向该第二反射面的光线被所述第二反射面反射。
在本发明的背光模组中，所述第二倾斜角度与该折射角度之和小于等于45度。
在本发明的背光模组中，所述第三反射面相对所述导光板入光面的最大距离小于所述背光模组的混光距离；
所述镂空结构沿着所述垂直入光方向具有一镂空长度，所述镂空长度小于所述背光模组的混光距离。
在本发明的背光模组中，所述第三反射面为平面。
在本发明的背光模组中，所述第三反射面为曲面。
在本发明的背光模组中，所述第三反射面为圆弧面；
在所述导光板的水平面上，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第一倾斜角。
在本发明的背光模组中，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第二倾斜角。
在本发明的背光模组中，所述镂空结构沿着所述导光板厚度方向具有一镂空深度D，所述第三反射面与所述背光模组的混光线具有一最短距离L，所述镂空结构在所述混光线的最小出射张角δ，所述镂空深度、所述最短距离以及所述最小出射张角δ满足以下公式：
sinδ ≤ nLGP×sin(atan(L/D))；其中，nLGP为所述导光版的折射率。
本发明的另一个目的在于提供一种背光模组，以解决现有技术中进入所述导光板的垂直入射光线以及集中在该垂直入射光线周围的光线进入导光板后，集中分布在导光板中的某一范围内，使得导光板存在亮暗不均现象的技术问题。
为解决上述问题，本发明构造了一种背光模组，包括光源和导光板，所述导光板包括位于一侧的入光面，所述光源靠近所述入光面；
所述导光板内部设置有中空的镂空结构，所述镂空结构对应所述光源，包括有沿着所述导光板厚度方向设置的第一反射面和第二反射面；
所述第一反射面沿着所述光源与所述导光板之间水平垂直于所述入光面的垂直入光方向呈第一倾斜角度；所述第二反射面沿着所述垂直入光方向呈第二倾斜角度，所述第一倾斜角度和所述第二倾斜角度的倾斜方向相反；
在所述第一倾斜角度下，所述镂空结构对应的光源射向该第一反射面的光线被所述第一反射面反射；在所述第二倾斜角度下，所述镂空结构对应的光源射向该第二反射面的光线被所述第二反射面反射。
在本发明的背光模组中，沿着所述垂直入光方向进入所述导光板的光线具有一折射角度，所述第一倾斜角度与该折射角度之和小于等于45度。
在本发明的背光模组中，所述第二倾斜角度与该折射角度之和小于等于45度。
在本发明的背光模组中，所述镂空结构还包括有第三反射面；所述第三反射面相对所述导光板入光面的最大距离小于所述背光模组的混光距离；
所述镂空结构沿着所述垂直入光方向具有一镂空长度，所述镂空长度小于所述背光模组的混光距离。
在本发明的背光模组中，所述第三反射面为平面。
在本发明的背光模组中，所述第三反射面为曲面。
在本发明的背光模组中，所述第三反射面为圆弧面；
在所述导光板的水平面上，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第一倾斜角。
在本发明的背光模组中，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第二倾斜角。
在本发明的背光模组中，所述镂空结构沿着所述导光板厚度方向具有一镂空深度D，所述第三反射面与所述背光模组的混光线具有一最短距离L，所述镂空结构在所述混光线的最小出射张角δ，所述镂空深度、所述最短距离以及所述最小出射张角δ满足以下公式：
sinδ ≤ nLGP×sin(atan(L/D))；其中，nLGP为所述导光版的折射率。
本发明的又一个目的在于提供一种液晶显示器，以解决现有技术中进入所述导光板的垂直入射光线以及集中在该垂直入射光线周围的光线进入导光板后，集中分布在导光板中的某一范围内，使得导光板存在亮暗不均现象的技术问题。
为解决上述问题，本发明构造了一种液晶显示器，包括背光模组，所述背光模组包括光源和导光板，所述导光板包括位于一侧的入光面，所述光源靠近所述入光面；
所述导光板内部设置有中空的镂空结构，所述镂空结构对应所述光源，包括有沿着所述导光板厚度方向设置的第一反射面和第二反射面；
所述第一反射面沿着所述光源与所述导光板之间水平垂直于所述入光面的垂直入光方向呈第一倾斜角度；所述第二反射面沿着所述垂直入光方向呈第二倾斜角度，所述第一倾斜角度和所述第二倾斜角度的倾斜方向相反；
在所述第一倾斜角度下，所述镂空结构对应的光源射向该第一反射面的光线被所述第一反射面反射；在所述第二倾斜角度下，所述镂空结构对应的光源射向该第二反射面的光线被所述第二反射面反射。
 有益效果
本发明相对于现有技术，通过在导光板内部设置有中空的镂空结构，该镂空结构对应光源，该镂空结构将垂直入射光线以及集中在该垂直入射光线周围的光线进行反射，使得该部分光线呈散射效果，避免集中分布在导光板的某一区域，避免出现亮暗不均的现象。
 附图说明
图1为现有技术中背光模组的结构示意图；
图2为本发明中背光模组的第一较佳实施例结构示意图；
图3为图2的俯视结构示意图；
图4为图2的侧视结构示意图；
图5为本发明中背光模组的第二较佳实施例的俯视结构图。
 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。
请参阅图2，图2为本发明中背光模组的第一较佳实施例的结构示意图。
所述背光模组包括光源10以及导光板20，所述导光板20包括有入光面21，所述导光板20内设置有中空的镂空结构22。所述镂空结构22包括有沿着所述导光板20厚度方向C(即纵向方向)设置的第一反射面221、第二反射面222以及第三反射面223。
请一并参阅图3，图3为图2中其中一镂空结构22的俯视图。
在沿着所述光源10与所述导光板20之间水平垂直于所述入光面21的垂直入光方向A，所述第一反射面221具有第一倾斜角β1，在所述第一倾斜角度β1下，所述镂空结构22对应的光源10射向该第一反射面221的光线被所述第一反射面221反射；所述第二反射面222具有第二倾斜角β2，在所述第二倾斜角度β2下，所述镂空结构22对应的光源10射向该第二反射面222的光线被所述第二反射面222反射。
其中，所述第一倾斜角β1和第二倾斜角β2的倾斜方向相反，具体说来，所述第一倾斜角β1沿逆时针方向旋转，所述第二倾斜角β2沿顺时针方向旋转。
更具体的，沿着垂直入光方向A进入所述导光板20的光线具有一折射角度θLGP（图未标示，可参阅图1），所述第一倾斜角度β1与所述折射角度θLGP之和小于等于45度，即：
β1≤45°－θLGP；
在该条件下，所述第一反射面221可对接收到的光线进行反射。其中，该光线来自于所述镂空结构22对应的光源10。而且该光线为射向所述镂空结构22的水平垂直入射光线以及集中该垂直入射光线周围的光线，上述光线经所述镂空结构22的第一反射面221反射后，呈散射效果继续沿方向A前进，因而可以避免上述光线在所述导光板20的分布过于集中，进而避免液晶显示器出现亮暗不均的现象。
更具体的，所述第二倾斜角度β2与所述折射角度θLGP之和小于等于45度，即：
β2≤45°－θLGP；
在该条件下，所述第二反射面222可对接收到的光线进行反射。其中，该光线来自于所述镂空结构22对应的光源10。而且该光线为射向所述镂空结构22的垂直入射光线以及集中在该垂直入射光线周围的光线，上述光线经所述镂空结构22的第二反射面222反射后，呈散射效果继续沿垂直入光方向A前进，因而可以避免上述光线在所述导光板20的分布过于集中，进而避免液晶显示器出现亮暗不均的现象。
在具体实施过程中，所述第三反射面223优选为平面，此时所述镂空结构22在所述导光板20的水平面B上具有三角形的横截面结构（请参阅图3）。当然所述第三反射面223还可以为曲面，譬如圆弧面。
若所述第三反射面223为圆弧面，在水平面B的俯视图上，所述圆弧面的任一点的切线与垂直入光方向A的夹角小于所述第一倾斜角β1或者小于所述第二倾斜角β2。譬如，在靠近所述第一反射面221一侧的第三反射面223上的某一点的切线与垂直入光方向A的夹角小于所述第一倾斜角β1。
请继续参阅图3，在图3中，所述第三反射面223为平面。
所述第三反射面223相对所述导光板20的入光面21的最大距离(图未标示)小于所述背光模组的混光距离d，所述镂空结构22沿着垂直入光方向A具有一镂空长度H，所述镂空长度H同样小于所述背光模组的混光距离d，以保证所述镂空结构22能够在光线混合之前对光线进行反射。
请参阅图4，图4为图2所示的背光模组的第一较佳实施例的侧视图。
所述镂空结构22沿着所述导光板20厚度方向C具有一镂空深度D，所述第三反射面223与所述背光模组的混光线Q（即相邻光源的光线交叉点所在的直线）具有一最短距离L，所述镂空结构22在所述混光线Q的最小出射张角δ，所述镂空深度D、所述最短距离L以及所述最小出射张角δ满足以下公式：为
sinδ≤nLGP×sin(atan(L/D))；其中，nLGP为所述导光板20的折射率。
所述镂空深度D、所述最短距离L以及所述最小出射张角δ满足上述公式，可以有效的防止沿最小出射张角δ方向看到所述镂空结构22，进一步的保证发光效果。
在图4所示的实施例中，所述镂空深度D小于所述导光板20的厚度（图未标示）。在具体实施过程中，所述镂空深度D还可以等于所述导光板20的厚度，此处不一一列举。
本实施例中，通过调节所述镂空结构22的第一倾斜角β1、第二倾斜角β2，镂空长度H以及相对所述光源10的位置，可以有效的避免亮暗不均的现象。
请一并参阅图2，多个镂空结构22沿水平面B等间距排列，相邻镂空结构22之间的距离P满足以下公式：
B≥d/tan(arcsin(1/ nLGP))。
请参阅图5，图5为本发明中背光模组的第二较佳实施例的俯视结构图。
在该第二较佳实施例中，所述第三反射面223为折面，在具体实施过程中，可以通过控制高度比例ε= H’/H（1/2≤ε≤1）来实现对亮暗不均的控制，以减少亮暗不均的出现，其中，H’为第一反射面221和第二反射面222到所述入光面21的最大距离。
当然，若所述第三反射面223为曲面，则可以通过改变所述第三反射面223的曲线曲率来实现对亮暗不均的控制，以减少亮暗不均的出现，此处再详述。
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，鉴于所述背光模组在上文已有详细的描述，此处不再赘述。
本发明通过在导光板内部设置有中空的镂空结构，该镂空结构对应光源，该镂空结构将垂直入射光线以及集中在垂直入射光线周围的光线进行反射，使得该部分光线呈散射效果，避免集中分布在导光板的某一区域，避免出现亮暗不均的现象。
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
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Claims (18)

  1. 一种背光模组，包括光源和导光板，所述导光板包括位于一侧的入光面，所述光源靠近所述入光面，其中：
    所述导光板内部设置有中空的镂空结构，所述镂空结构对应所述光源，包括有沿着所述导光板厚度方向设置的第一反射面、第二反射面以及第三反射面；
    所述第一反射面沿着所述光源与所述导光板之间水平垂直于所述入光面的垂直入光方向呈第一倾斜角度；所述第二反射面沿着所述垂直入光方向呈第二倾斜角度，所述第一倾斜角度和所述第二倾斜角度的倾斜方向相反；沿着所述垂直入光方向进入所述导光板的光线具有一折射角度，所述第一倾斜角度与该折射角度之和小于等于45度；
    在所述第一倾斜角度下，所述镂空结构对应的光源射向该第一反射面的光线被所述第一反射面反射；在所述第二倾斜角度下，所述镂空结构对应的光源射向该第二反射面的光线被所述第二反射面反射。
  2. 根据权利要求1所述的背光模组，其中，所述第二倾斜角度与所述折射角度之和小于等于45度。
  3. 根据权利要求1所述的背光模组，其中，所述第三反射面相对所述导光板入光面的最大距离小于所述背光模组的混光距离；
    所述镂空结构沿着所述垂直入光方向具有一镂空长度，所述镂空长度小于所述背光模组的混光距离。
  4. 根据权利要求3所述的背光模组，其中，所述第三反射面为平面。
  5. 根据权利要求3所述的背光模组，其中，所述第三反射面为曲面。
  6. 根据权利要求5所述的背光模组，其中，所述第三反射面为圆弧面；
    在所述导光板的水平面上，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第一倾斜角。
  7. 根据权利要求6所述的背光模组，其中，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第二倾斜角。
  8. 根据权利要求3所述的背光模组，其中，所述镂空结构沿着所述导光板厚度方向具有一镂空深度D，所述第三反射面与所述背光模组的混光线具有一最短距离L，所述镂空结构在所述混光线的最小出射张角δ，所述镂空深度、所述最短距离以及所述最小出射张角δ满足以下公式：
    sinδ ≤ nLGP×sin(atan(L/D))；其中，nLGP为所述导光版的折射率。
  9. 一种背光模组，包括光源和导光板，所述导光板包括位于一侧的入光面，所述光源靠近所述入光面，其中：
    所述导光板内部设置有中空的镂空结构，所述镂空结构对应所述光源，包括有沿着所述导光板厚度方向设置的第一反射面和第二反射面；
    所述第一反射面沿着所述光源与所述导光板之间水平垂直于所述入光面的垂直入光方向呈第一倾斜角度；所述第二反射面沿着所述垂直入光方向呈第二倾斜角度，所述第一倾斜角度和所述第二倾斜角度的倾斜方向相反；
    在所述第一倾斜角度下，所述镂空结构对应的光源射向该第一反射面的光线被所述第一反射面反射；在所述第二倾斜角度下，所述镂空结构对应的光源射向该第二反射面的光线被所述第二反射面反射。
  10. 根据权利要求9所述的背光模组，其中，沿着所述垂直入光方向进入所述导光板的光线具有一折射角度，所述第一倾斜角度与该折射角度之和小于等于45度。
  11. 根据权利要求10所述的背光模组，其中，所述第二倾斜角度与该折射角度之和小于等于45度。
  12. 根据权利要求9所述的背光模组，其中，所述镂空结构还包括有第三反射面；所述第三反射面相对所述导光板入光面的最大距离小于所述背光模组的混光距离；
    所述镂空结构沿着所述垂直入光方向具有一镂空长度，所述镂空长度小于所述背光模组的混光距离。
  13. 根据权利要求12所述的背光模组，其中，所述第三反射面为平面。
  14. 根据权利要求12所述的背光模组，其中，所述第三反射面为曲面。
  15. 根据权利要求12所述的背光模组，其中，所述第三反射面为圆弧面；
    在所述导光板的水平面上，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第一倾斜角。
  16. 根据权利要求15所述的背光模组，其中，所述垂直入光方向与所述圆弧面上任一点的切线的夹角小于所述第二倾斜角。
  17. 根据权利要求12所述的背光模组，其中，所述镂空结构沿着所述导光板厚度方向具有一镂空深度D，所述第三反射面与所述背光模组的混光线具有一最短距离L，所述镂空结构在所述混光线的最小出射张角δ，所述镂空深度、所述最短距离以及所述最小出射张角δ满足以下公式：
    sinδ ≤ nLGP×sin(atan(L/D))；其中，nLGP为所述导光版的折射率。
  18. 一种液晶显示器，其中，包括背光模组，所述背光模组包括光源和导光板，所述导光板包括位于一侧的入光面，所述光源靠近所述入光面；
    所述导光板内部设置有中空的镂空结构，所述镂空结构对应所述光源，包括有沿着所述导光板厚度方向设置的第一反射面和第二反射面；
    所述第一反射面沿着所述光源与所述导光板之间水平垂直于所述入光面的垂直入光方向呈第一倾斜角度；所述第二反射面沿着所述垂直入光方向呈第二倾斜角度，所述第一倾斜角度和所述第二倾斜角度的倾斜方向相反；
    在所述第一倾斜角度下，所述镂空结构对应的光源射向该第一反射面的光线被所述第一反射面反射；在所述第二倾斜角度下，所述镂空结构对应的光源射向该第二反射面的光线被所述第二反射面反射。
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Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3015005B1 (fr) * 2013-12-13 2018-12-07 Valeo Systemes Thermiques Dispositif lumineux
CN103939799B (zh) * 2014-03-31 2015-11-25 京东方科技集团股份有限公司 一种背光模组及液晶显示装置
CN104597555B (zh) * 2014-12-02 2019-01-15 深圳市华星光电技术有限公司 导光板、背光模组及液晶显示装置
CN204300980U (zh) * 2015-01-04 2015-04-29 京东方科技集团股份有限公司 反射结构、背光模组和显示装置
CN105204108B (zh) * 2015-10-08 2018-03-13 京东方光科技有限公司 侧入式导光板、背光模组及其制作方法和显示装置
CN105629370A (zh) * 2016-01-05 2016-06-01 京东方光科技有限公司 一种导光板、背光模组及显示装置
FR3062486B1 (fr) * 2017-01-30 2019-04-19 Valeo Comfort And Driving Assistance Guide de lumiere et ensemble optique comprenant un tel guide de lumiere
US10705289B2 (en) * 2018-06-14 2020-07-07 Sharp Kabushiki Kaisha Lighting device and display device
CZ307985B6 (cs) * 2018-08-03 2019-10-02 Varroc Lighting Systems, s.r.o. Světlovodivá optická jednotka a světlovodivý optický systém zahrnující světlovodivé optické jednotky
DE102019106221A1 (de) * 2019-03-12 2020-09-17 HELLA GmbH & Co. KGaA Beleuchtungsvorrichtung für Fahrzeuge
CN116299833A (zh) * 2020-02-18 2023-06-23 淮安达方电子有限公司 背光模组
CN111325192A (zh) * 2020-04-10 2020-06-23 Oppo广东移动通信有限公司 背光模组、显示屏及电子设备
US11747547B2 (en) * 2021-12-28 2023-09-05 Asustek Computer Inc. Backlight module

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2607593Y (zh) * 2002-12-20 2004-03-24 鸿富锦精密工业（深圳）有限公司 背光源
CN2638098Y (zh) * 2003-06-23 2004-09-01 鸿富锦精密工业（深圳）有限公司 背光模组及液晶显示器
US20040252483A1 (en) * 2003-06-11 2004-12-16 Cheng Wen Feng Backlight system and liquid crystal display using the same
CN201037886Y (zh) * 2007-05-08 2008-03-19 台湾奈普光电科技股份有限公司 高质度背光模块结构
CN101178513A (zh) * 2006-11-09 2008-05-14 三星电子株式会社 背光单元
CN102121668A (zh) * 2010-01-11 2011-07-13 中强光电股份有限公司 导光板及背光模组

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4159059B2 (ja) * 1998-06-05 2008-10-01 シチズン電子株式会社 面状光源ユニット
CN101078795B (zh) * 2006-05-24 2010-05-12 清华大学 导光板及背光模组
US7690811B2 (en) * 2006-11-17 2010-04-06 General Electric Company System for improved backlight illumination uniformity
CN101617252B (zh) * 2006-12-29 2012-06-20 莫迪尼斯有限公司 用于照明应用的内耦合结构
TWI349121B (en) * 2007-05-17 2011-09-21 Wintek Corp Light guide plate and backlight module having the same
US7808578B2 (en) * 2007-07-12 2010-10-05 Wintek Corporation Light guide place and light-diffusing structure thereof
TWI364557B (en) * 2008-05-02 2012-05-21 Chimei Innolux Corp Light source and backlight module and liquid crystal display device using same
CN101761829B (zh) * 2010-01-18 2011-09-21 友达光电股份有限公司 背光模块及使用该背光模块的显示装置
JP2012038503A (ja) * 2010-08-05 2012-02-23 Sony Corp 光源ユニットおよび照明装置
KR101261462B1 (ko) * 2010-08-26 2013-05-10 엘지이노텍 주식회사 백라이트 유닛
CN102182964A (zh) * 2011-04-29 2011-09-14 深圳市华星光电技术有限公司 背光模组及液晶显示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2607593Y (zh) * 2002-12-20 2004-03-24 鸿富锦精密工业（深圳）有限公司 背光源
US20040252483A1 (en) * 2003-06-11 2004-12-16 Cheng Wen Feng Backlight system and liquid crystal display using the same
CN2638098Y (zh) * 2003-06-23 2004-09-01 鸿富锦精密工业（深圳）有限公司 背光模组及液晶显示器
CN101178513A (zh) * 2006-11-09 2008-05-14 三星电子株式会社 背光单元
CN201037886Y (zh) * 2007-05-08 2008-03-19 台湾奈普光电科技股份有限公司 高质度背光模块结构
CN102121668A (zh) * 2010-01-11 2011-07-13 中强光电股份有限公司 导光板及背光模组

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