WO2013139050A1 - 背光模块以及液晶显示装置 - Google Patents

背光模块以及液晶显示装置 Download PDF

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Publication number
WO2013139050A1
WO2013139050A1 PCT/CN2012/073179 CN2012073179W WO2013139050A1 WO 2013139050 A1 WO2013139050 A1 WO 2013139050A1 CN 2012073179 W CN2012073179 W CN 2012073179W WO 2013139050 A1 WO2013139050 A1 WO 2013139050A1
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Prior art keywords
reflective
guide plate
curved surface
light guide
plane
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PCT/CN2012/073179
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English (en)
French (fr)
Inventor
黄建发
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深圳市华星光电技术有限公司
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Priority to US13/502,745 priority Critical patent/US8994895B2/en
Publication of WO2013139050A1 publication Critical patent/WO2013139050A1/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
    • G02B6/0023—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
    • G02B6/0031—Reflecting element, sheet or layer
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/126—Reflex reflectors including curved refracting surface

Definitions

  • the present invention relates to the field of liquid crystal display, and in particular to a backlight module and a liquid crystal display device capable of improving coupling efficiency.
  • Liquid crystal display (Liquid Crystal Display, LCD) has been widely used in a variety of electronic products, LCD monitors are mostly backlit LCD monitors, including LCD panels and backlight modules (backlight Module).
  • the backlight module can be divided into a side-light type backlight module and a direct-lit light (Direct-light) according to the incident position of the light source.
  • Type Two types of backlight modules.
  • FIG. 1 is a schematic structural diagram of a conventional side-lit light-emitting backlight module.
  • the backlight module includes a light guide plate 101, a light source 102, a reflective element 103, a susceptor 104, a reflection sheet 105, a back plate 106, and a light source reflection sheet 107.
  • the reflection element 103 is generally an inclined reflection surface.
  • the present invention provides a backlight module and a liquid crystal display device having a reflective element including a reflective curved surface and a reflective plane, the reflective element improving the light coupling efficiency of the backlight module, and solving the coupling efficiency of the existing backlight module and the liquid crystal display device. Lower technical issues.
  • the present invention relates to a backlight module, wherein the backlight module includes: a light guide plate; a susceptor disposed on one side of the light guide plate; a light source disposed on the pedestal; and a reflective element for reflecting light emitted by the light source to a light incident surface of the light guide plate,
  • the reflective element includes a connected reflective surface and a first reflective plane; the first reflective plane is parallel to the light incident surface of the light guide plate, and the reflective curved surface includes a cross-sectional curve with a decreasing slope of the curve; the reflection
  • the curved surface has a first radius of curvature and a second radius of curvature, the first radius of curvature being close to the light guide plate, the second radius of curvature being away from the light guide plate, and the second radius of curvature being greater than the first radius of curvature.
  • the invention further relates to a backlight module, wherein the backlight module comprises: a light guide plate; a base disposed on one side of the light guide plate; a light source disposed on the base; and a reflective element for Light emitted by the light source is reflected on a light incident surface of the light guide plate, and the reflective element includes a connected reflective curved surface and a first reflective plane.
  • the first reflection plane is parallel to the light incident surface of the light guide plate, and the reflection curved surface includes a cross-sectional curve whose curve slope gradually decreases.
  • the reflective element includes a first reflective plane, a reflective curved surface, and a second reflective plane that are sequentially connected.
  • the reflective curved surface has a first radius of curvature and a second radius of curvature, the first radius of curvature being close to the light guide plate, and the second radius of curvature being away from the light guide plate.
  • the second radius of curvature is greater than the first radius of curvature.
  • an angle between the first reflective plane and the second reflective plane is greater than 90 degrees.
  • the curve slope change rate of the cross-sectional curve is less than 0.7.
  • the maximum value of the slope of the curve of the cross-sectional curve is 2 to 2.5, and the minimum value of the slope of the curve of the cross-sectional curve is 0.25 to 0.3.
  • the ratio of the height of the first reflecting plane to the height of the reflective curved surface is 0.9 to 1.1.
  • the ratio of the height of the first reflection plane to the height of the reflective curved surface is 0.9 to 1.1, and the ratio of the height of the reflective curved surface to the height of the second reflective plane is 9 to 11.
  • the present invention also relates to a liquid crystal display device including a display panel; and a backlight module comprising: a light guide plate; a susceptor disposed on one side of the light guide plate; a light source disposed on the pedestal; and a reflective element for reflecting light emitted by the light source to a light incident surface of the light guide plate,
  • the reflective element includes a connected reflective surface and a first reflective plane.
  • the first reflection plane is parallel to the light incident surface of the light guide plate, and the reflection curved surface includes a cross-sectional curve in which a slope of the curve gradually decreases.
  • the reflective element includes a first reflective plane, a reflective curved surface, and a second reflective plane that are sequentially connected.
  • the reflective curved surface has a first radius of curvature and a second radius of curvature, the first radius of curvature being close to the light guide plate, and the second radius of curvature being away from the light guide plate.
  • the second radius of curvature is greater than the first radius of curvature.
  • an angle between the first reflection plane and the second reflection plane is greater than 90 degrees.
  • the curve slope change rate of the cross-sectional curve is less than 0.7.
  • the maximum value of the slope of the curve of the cross-sectional curve is 2 to 2.5, and the minimum value of the slope of the curve of the cross-sectional curve is 0.25 to 0.3.
  • the ratio of the height of the first reflection plane to the height of the reflective curved surface is 0.9 to 1.1.
  • the ratio of the height of the first reflection plane to the height of the reflective curved surface is 0.9 to 1.1, and the ratio of the height of the reflective curved surface to the height of the second reflective plane It is 9 to 11.
  • the light coupling efficiency of the backlight module is improved, and the technical problem of low coupling efficiency of the existing backlight module and the liquid crystal display device is solved.
  • FIG. 1 is a schematic structural view of a conventional side-lit light-emitting backlight module
  • FIG. 2 is a schematic structural view of a first preferred embodiment of a backlight module of the present invention
  • FIG. 3 is a schematic structural view of a reflective element of a first preferred embodiment of a backlight module of the present invention
  • FIG. 4 is a schematic view showing a cross-sectional curve of a first preferred embodiment of a backlight module of the present invention
  • FIG. 5 is a schematic structural view of a second preferred embodiment of a backlight module of the present invention.
  • FIG. 6 is a schematic structural view of a reflective element of a second preferred embodiment of the backlight module of the present invention.
  • the backlight module includes a light guide plate 201, a susceptor 204, a light source 202, a reflective element 203, a reflective sheet 205, a back plate 206, and The light source reflective sheet 207, wherein the light guide plate 201 is disposed on the back plate 206 for guiding light of the light source; the base 204 is disposed at one side of the light guide plate 201; and the base 204 is provided with a light source 202 for emitting light to the light guide plate.
  • the reflective element 203 is disposed on the light incident side of the light guide plate 201 for emitting light from the light source 202. Reflected on the light incident surface of the light guide plate 201; the reflective sheet 205 is used to reflect the light traveling to the light reflecting surface of the light guide plate 201, and the light source reflective sheet 207 is used to reflect the light directed to the side wall of the light source out of the light source.
  • the reflective element 203 includes a connected reflective curved surface 2032 and a first reflective flat 2031 (the portion above the light source 202 as shown in FIG. 2).
  • FIG. 3 is a schematic structural view of a reflective element of a first preferred embodiment of the backlight module of the present invention.
  • the reflective element 203 includes a first reflective plane 2031 and a reflective curved surface 2032.
  • the first reflecting plane 2031 is parallel to the light incident surface of the light guide plate 201, and the reflective curved surface 2032 includes a section curve whose curve slope is gradually decreased (according to the coordinate system shown in FIG. 3), and the plane of the section curve is perpendicular to the light source at the same time.
  • the light-emitting surface of 202 and the light-incident surface of the light guide plate 201, the first reflection plane 2031 and the reflection curved surface 2032 are smoothly connected above the light source 202 (ie, the reflection surface corresponding to the end of the first reflection plane 2031 and the curve having the largest slope of the section curve) 2032 connection), wherein the slope of the starting curve of the section curve (ie, the slope of the maximum curve) is 2 to 2.5, the slope of the end curve of the section curve (ie, the slope of the minimum curve) is 0.25 to 0.3, and the rate of change of the slope of the section curve is less than 0.7. .
  • the ratio H1/H2 of the height H1 of the first reflection plane 2031 to the height H2 of the reflection curved surface 2032 is 0.9 to 1.1 as shown in FIG.
  • FIG. 4 is a schematic diagram showing a cross-sectional curve of a first preferred embodiment of a backlight module of the present invention.
  • the reflective curved surface 2032 may be a parabolic curved surface, which may have a first radius of curvature R1 and a second radius of curvature R1, the first radius of curvature R1 being a light incident surface adjacent to the light guide plate 201,
  • the second radius of curvature R2 is a light incident surface away from the light guide plate 201, wherein the second radius of curvature R2 is greater than the first radius of curvature R1.
  • the cross-sectional curve of the reflective curved surface 2032 can be expressed as the following formula 1 (according to the coordinate system shown in FIG. 3):
  • the reflective element 203 is a reflective surface formed by combining the first reflective plane 2031 and the reflective curved surface 2032, so that the light of the light source 202 is reflected by the reflective component 203. After that, most of the light is reflected on the light incident surface of the light guide plate 201.
  • the reflective curved surface 2032 can achieve a better reflection effect.
  • the first reflective plane 2031 and the reflective curved surface 2032 can achieve a better fit without affecting the reflection due to the first reflective plane 2031 being too long or too short.
  • the reflection effect of the curved surface 2032 is not limited to the number of the section curves, and the reflective element 203 can implement the present invention as long as the corresponding section curve of the reflective curved surface 2032 is a plurality of curves (for example, a quadratic curve) satisfying the above conditions.
  • Backlight module is not limited to the number of the section curves, and the reflective element 203 can implement the present invention as long as the corresponding section curve of the reflective curved surface 2032 is a plurality of curves (for example, a quadratic curve) satisfying the above conditions.
  • FIG. 5 is a schematic structural diagram of a second preferred embodiment of a backlight module according to the present invention.
  • the second preferred embodiment is different from the first preferred embodiment in that the backlight module includes a reflective element 403 and a reflective element.
  • the 403 includes a first reflection plane 4031 (a portion above the light source 202 as shown in FIG. 2), a reflection curved surface 4032, and a second reflection plane 4033, wherein the second reflection plane 4033 extends on a tangent line of the reflection curved surface 4032.
  • FIG. 6 is a schematic structural view of a reflective element of a second preferred embodiment of the backlight module of the present invention.
  • the first reflective plane 4031 is parallel to the light incident surface of the light guide plate 201
  • the reflective curved surface 4032 includes a cross section curve whose slope gradually decreases (according to the coordinate system shown in FIG.
  • first The reflection plane 4031, the reflection curved surface 4032, and the second reflection plane 4033 are smoothly connected above the light source 202 (ie, the first reflection plane 4031 is connected to the reflection curved surface 4032 corresponding to the end of the curve curve having the largest slope of the cross-sectional curve, and the second reflection plane 4033 is The end of the curve of the cross-section curve has a slope with a minimum slope corresponding to the reflection surface 4032, wherein the slope of the starting curve of the section curve (ie, the slope of the maximum curve) is 2 to 2.5, and the slope of the end curve of the section curve (ie, the slope of the minimum curve) is From 0.25 to 0.3, the curve slope change rate of the section curve is less than 0.7. Meanwhile, as shown in FIG.
  • the ratio H1/H2 of the height H1 of the first reflection plane 4031 to the height H2 of the reflection curved surface 4032 is 0.9 to 1.1
  • the ratio H2 of the height H2 of the reflection curved surface 4032 to the height H3 of the second reflection plane 4033/ H3 is 9 to 11.
  • the reflective element 403 is based on the first preferred embodiment, in the case of using a large-sized light source 202 and a thin-thickness light guide plate 201,
  • the reflective element 403 adds a second reflective plane 4033 that reflects the corresponding light of the light source 202 to the light incident surface of the light guide plate 201 as much as possible while increasing the height of the reflective element 403.
  • the reflection curve 4032 can also achieve a better reflection effect by setting the initial curve slope, the end curve slope, and the curve slope change rate of the corresponding section curves of the reflection curved surface 4032.
  • the first reflection plane 4031, the reflection curved surface 4032, and the second reflection plane are disposed.
  • 4033 can achieve a better fit, without affecting the reflection effect of the reflective curved surface 4032 due to the excessively long or too short of the first reflective plane 4031; the height of the second reflective flat 4033 is set smaller, further ensuring that the reflective curved surface 4032 can be achieved. Better reflection effect.
  • the type of the corresponding section curve of the reflective curved surface 4032 is not limited to the number of times of the curve, and the reflective element 403 can implement the present invention as long as the corresponding section curve of the reflective curved surface 4032 is a plurality of curves (for example, a quadratic curve) satisfying the above conditions.
  • Backlight module is not limited to the number of times of the curve, and the reflective element 403 can implement the present invention as long as the corresponding section curve of the reflective curved surface 4032 is a plurality of curves (for example, a quadratic curve) satisfying the above conditions.
  • Backlight module for example, a quadratic curve
  • the second reflective plane 4033 is extended as the end of the reflective curved surface 4032, the slope of the second reflective plane 4033 may be less than or equal to the minimum value of the slope of the curve of the above-mentioned cross-sectional curve, and the first reflective plane 4031 and the first
  • the angle ⁇ between the two reflection planes 4033 can be greater than 90 degrees ( ⁇ >90o), so that the reflective surface 4032 can achieve better reflection effect, and the reflective surface 4032 and the second reflection plane 4033 can smoothly transition.
  • the second reflective plane 4033 can reflect the light of the light source 202 to the light incident surface of the light guide plate 201 as much as possible.
  • the optical simulation software is used to simulate the backlight module of the present invention. It is found that most of the light of the light source 202 can be directly incident on the light guide plate 201 after being reflected by the reflective element, and the coupling efficiency can reach 90.5%, which is compared with the existing backlight module. The coupling efficiency is greatly improved.
  • the present invention also relates to a liquid crystal display device including a display panel and a backlight module, wherein the backlight module includes a light guide plate, a base, a light source, and a reflective element, wherein the light guide plate is disposed on the back plate for guiding light of the light source;
  • the base is disposed at the bottom of the light incident side of the light guide plate;
  • the base is provided with a light source for emitting light into the light guide plate, and the light guide plate guides the light;
  • the reflective element is disposed at the top of the light incident side of the light guide plate, and is used for The light emitted by the light source is reflected on the light incident surface of the light guide plate, and the reflective element includes a connected reflective curved surface and a first reflective plane.
  • the working principle and the beneficial effects of the liquid crystal display device of the present invention are the same as or similar to those described in the specific embodiment of the backlight module. For details, please refer to the specific embodiment of the backlight module.
  • the backlight module and the liquid crystal display device of the present invention are provided with reflective elements having a reflective curved surface and a reflective plane, which improves the light coupling efficiency of the backlight module, and solves the problem that the existing backlight module and the liquid crystal display device have low coupling efficiency. technical problem.

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Abstract

一种背光模块及液晶显示装置，包括：导光板（201）、设置在导光板（201）的一侧的基座（204）、设置在基座（204）上的光源（202）以及用于将光源（202）发出的光反射到导光板（201）的入光面上的反射元件(203），反射元件（203）包括相连的反射曲面（2032）及第一反射平面（2031）。因此，背光模块及液晶显示装置具有较高的耦光效率。

Description

背光模块以及液晶显示装置 技术领域
本发明涉及液晶显示领域，特别是涉及一种可提高耦光效率的背光模块以及液晶显示装置。
 背景技术
液晶显示器(Liquid Crystal Display，LCD)已被广泛应用于各种电子产品中，液晶显示器大部分为背光型液晶显示器，其包括液晶面板及背光模块(backlight module)。背光模块可依照光源入射位置的不同分成侧向式入光(Side-light type)背光模块与直下式入光(Direct-light type)背光模块两种。
如图1所示，图1为一种现有侧向式入光的背光模块的结构示意图。其中背光模块包括导光板101、光源102、反射元件103、基座104、反射片105、背板106以及光源反射片107，反射元件103通常为倾斜的反射面。通过使用光学模拟软件进行光学模拟发现，采用上述反射元件103时，被反射元件103所反射的部分光线无法直接进入导光板101，而有部分光线反射回光源102，导致背光模块的耦光效率有较大损失（耦光效率的损失大于15%)。
故，有必要提供一种背光模块及液晶显示装置，以解决现有技术所存在的问题。
 技术问题
本发明提供一种背光模块及液晶显示装置，其具有包括反射曲面和反射平面的反射元件，该反射元件提高了背光模块的耦光效率，解决了现有背光模块及液晶显示装置的耦光效率较低的技术问题。
 技术解决方案
本发明涉及一种背光模块，其中所述背光模块包括：导光板； 基座，设置在所述导光板的一侧；光源，设置在所述基座上；以及反射元件，用于将所述光源发出的光反射到所述导光板的入光面上，所述反射元件包括相连的反射曲面及第一反射平面；所述第一反射平面平行于所述导光板的所述入光面，所述反射曲面包括一曲线斜率逐渐减小的截面曲线；所述反射曲面具有第一曲率半径及第二曲率半径，所述第一曲率半径靠近所述导光板，所述第二曲率半径远离所述导光板，所述第二曲率半径大于所述第一曲率半径。
本发明还涉及一种背光模块，其中所述背光模块包括：导光板；基座，设置在所述导光板的一侧；光源，设置在所述基座上；以及反射元件，用于将所述光源发出的光反射到所述导光板的入光面上，所述反射元件包括相连的反射曲面及第一反射平面。
在本发明所述的背光模块中，所述第一反射平面平行于所述导光板的所述入光面，所述反射曲面包括一曲线斜率逐渐减小的截面曲线。
在本发明所述的背光模块中，所述反射元件包括依次相连的第一反射平面、反射曲面以及第二反射平面。
在本发明所述的背光模块中，所述反射曲面具有第一曲率半径及第二曲率半径，所述第一曲率半径靠近所述导光板，所述第二曲率半径远离所述导光板，所述第二曲率半径大于所述第一曲率半径。
在本发明所述的背光模块中，所述第一反射平面和所述第二反射平面之间的夹角大于90度。
在本发明所述的背光模块中，所述截面曲线的曲线斜率变化率小于0.7。
在本发明所述的背光模块中，所述截面曲线的曲线斜率的最大值为2至2.5，所述截面曲线的曲线斜率的最小值为0.25至0.3。
在本发明所述的背光模块中，所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1。
在本发明所述的背光模块中，所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1，所述反射曲面的高度与所述第二反射平面的高度的比值为9至11。
本发明还涉及一种液晶显示装置，其中包括显示面板；以及背光模块，包括：导光板； 基座，设置在所述导光板的一侧；光源，设置在所述基座上；以及反射元件，用于将所述光源发出的光反射到所述导光板的入光面上，所述反射元件包括相连的反射曲面及第一反射平面。
在本发明所述的液晶显示装置中，所述第一反射平面平行于所述导光板的所述入光面，所述反射曲面包括一曲线斜率逐渐减小的截面曲线。
在本发明所述的液晶显示装置中，所述反射元件包括依次相连的第一反射平面、反射曲面以及第二反射平面。
在本发明所述的液晶显示装置中，所述反射曲面具有第一曲率半径及第二曲率半径，所述第一曲率半径靠近所述导光板，所述第二曲率半径远离所述导光板，所述第二曲率半径大于所述第一曲率半径。
在本发明所述的液晶显示装置中，所述第一反射平面和所述第二反射平面之间的夹角大于90度。
在本发明所述的液晶显示装置中，所述截面曲线的曲线斜率变化率小于0.7。
在本发明所述的液晶显示装置中，所述截面曲线的曲线斜率的最大值为2至2.5，所述截面曲线的曲线斜率的最小值为0.25至0.3。
在本发明所述的液晶显示装置中，所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1。
在本发明所述的液晶显示装置中，所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1，所述反射曲面的高度与所述第二反射平面的高度的比值为9至11。
 有益效果
通过设置具有包括反射曲面和反射平面的反射元件，提高了背光模块的耦光效率，解决了现有背光模块及液晶显示装置耦光效率较低的技术问题。
 附图说明
图1为一种现有侧向式入光的背光模块的结构示意图；
图2为本发明的背光模块的第一优选实施例的结构示意图；
图3为本发明的背光模块的第一优选实施例的反射元件的结构示意图；
图4为本发明的背光模块的第一优选实施例的截面曲线的示意图；
图5为本发明的背光模块的第二优选实施例的结构示意图；
图6为本发明的背光模块的第二优选实施例的反射元件的结构示意图。
 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。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
在图中，结构相似的单元是以相同标号表示。
请参照图2，图2为本发明的背光模块的第一优选实施例的结构示意图，其中背光模块包括导光板201、基座204、光源202、反射元件203、反射片205、背板206以及光源反射片207，其中导光板201设置在背板206上，用于引导光源的光线；基座204设置在导光板201的一侧；基座204上设置有光源202，用于发光至导光板201内，并由导光板201来引导出光，其中光源202的出光面是约垂直与导光板的入光面；反射元件203设置在导光板201的入光侧，用于将光源202发出的光反射到导光板201的入光面上；反射片205用以反射行进至导光板201的光反射面上的光线，光源反射片207用于将射向光源侧壁的光线反射出光源。在本实施例中，反射元件203包括相连的反射曲面2032和第一反射平面2031（如图2所示的光源202以上的部分）。
该反射元件203的具体结构如图3所示，图3为本发明的背光模块的第一优选实施例的反射元件的结构示意图。参照图2和图3，反射元件203包括第一反射平面2031和反射曲面2032。第一反射平面2031平行于导光板201的入光面，反射曲面2032包括一曲线斜率逐渐减小的截面曲线（以图3所示的坐标系为准），该截面曲线所在平面同时垂直于光源202的出光面和导光板201的入光面，第一反射平面2031和反射曲面2032在光源202的上方平滑连接（即第一反射平面2031与上述截面曲线的曲线斜率最大的一端对应的反射曲面2032连接），其中该截面曲线的起始曲线斜率（即最大曲线斜率）为2至2.5，截面曲线的结束曲线斜率（即最小曲线斜率）为0.25至0.3，截面曲线的曲线斜率变化率小于0.7。同时如图3所示第一反射平面2031的高度H1与反射曲面2032的高度H2的比值H1/H2为0.9至1.1。
请参照图4，图4为本发明的背光模块的第一优选实施例的截面曲线的示意图。在本实施例中，反射曲面2032可为抛物曲面，其可具有第一曲率半径R1及第二曲率半R2，所述第一曲率半径R1是靠近所述导光板201的入光面，所述第二曲率半径R2是远离所述导光板201的入光面，其中第二曲率半径R2是大于第一曲率半径R1。又如图4所示，在本实施例中，反射曲面2032的截面曲线可表示为如下公式1（以图3所示的坐标系为准）：
y = -0.5185x2 + 0.7964x + 2.2601 (1)。
本优选实施例的背光模块使用时，如图2和图3所示，反射元件203由第一反射平面2031和反射曲面2032组合而成的反射面，使得光源202的光线经该反射元件203反射后，绝大多数的光线均反射到导光板201的入光面上。通过设置反射曲面2032的相应截面曲线的起始曲线斜率、结束曲线斜率以及曲线斜率变化率，使得反射曲面2032能够达到较佳的反射效果。通过设置第一反射平面2031和反射曲面2032的高度比H1/H2，使得第一反射平面2031和反射曲面2032可以达到较佳的配合，不会由于第一反射平面2031过长或过短影响反射曲面2032的反射效果。同时反射曲面2032的相应截面曲线的种类不局限于截面曲线的次数，只要反射曲面2032的相应截面曲线为满足上述条件的多次曲线（例如二次曲线），该反射元件203均可实现本发明的背光模块。
请参照图5，图5为本发明的背光模块的第二优选实施例的结构示意图，其中第二优选实施例和第一优选实施例的区别在于，所述背光模块包括反射元件403，反射元件403包括依次相连的第一反射平面4031（如图2所示的光源202以上的部分）、反射曲面4032以及第二反射平面4033，其中第二反射平面4033是延伸于反射曲面4032的切线上。
该反射元件403的具体结构如图6所示，图6为本发明的背光模块的第二优选实施例的反射元件的结构示意图。参照图5和图6，第一反射平面4031平行于导光板201的入光面，反射曲面4032包括一曲线斜率逐渐减小的截面曲线（以图6所示的坐标系为准），第一反射平面4031、反射曲面4032和第二反射平面4033在光源202的上方平滑连接（即第一反射平面4031与上述截面曲线的曲线斜率最大的一端对应的反射曲面4032连接，第二反射平面4033与上述截面曲线的曲线斜率最小的一端对应的反射曲面4032连接），其中该截面曲线的起始曲线斜率（即最大曲线斜率）为2至2.5，截面曲线的结束曲线斜率（即最小曲线斜率）为0.25至0.3，截面曲线的曲线斜率变化率小于0.7。同时如图6所示第一反射平面4031的高度H1与反射曲面4032的高度H2的比值H1/H2为0.9至1.1，反射曲面4032的高度H2与第二反射平面4033的高度H3的比值H2/H3为9至11。
本优选实施例的背光模块使用时，如图5和图6所示，该反射元件403在第一优选实施例的基础上，针对使用大尺寸的光源202和薄厚度的导光板201的情况，反射元件403增加了第二反射平面4033，该第二反射平面4033在少量的增加反射元件403的高度的同时，将光源202相应的光线尽可能的反射到导光板201的入光面上。在该实施例中，同样通过设置反射曲面4032的相应截面曲线的起始曲线斜率、结束曲线斜率以及曲线斜率变化率，使得反射曲面4032能够达到较佳的反射效果。通过设置第一反射平面4031和反射曲面4032的高度比H1/H2，以及反射曲面4032和第二反射平面4033的高度比H2/H3，使得第一反射平面4031、反射曲面4032以及第二反射平面4033可以达到较佳的配合，不会由于第一反射平面4031的过长或过短影响反射曲面4032的反射效果；第二反射平面4033的高度设置得较小，进一步保证了反射曲面4032可以达到较佳的反射效果。同时反射曲面4032的相应截面曲线的种类不局限于曲线的次数，只要反射曲面4032的相应截面曲线为满足上述条件的多次曲线（例如二次曲线），该反射元件403均可实现本发明的背光模块。
由于在本实施例中，第二反射平面4033作为反射曲面4032结束端的延伸，因此第二反射平面4033的斜率可小于或等于上述截面曲线的曲线斜率的最小值，且第一反射平面4031和第二反射平面4033之间的夹角Ө可大于90度(Ө>90º)，这样既保证了反射曲面4032可达到较佳的反射效果，又使得反射曲面4032和第二反射平面4033可平滑过渡，第二反射平面4033可尽可能的将光源202的光线反射到导光板201的入光面上。
使用光学模拟软件对本发明背光模块进行光学模拟，发现光源202的绝大部分的光线经过反射元件反射后可直接入射到导光板201内部，耦光效率可达到90.5%，较现有的背光模块的耦光效率有较大提升。
本发明还涉及一种液晶显示装置，其中包括显示面板以及背光模块，其中背光模块包括导光板、基座、光源以及反射元件，其中导光板设置在背板上，用于引导光源的光线；基座设置在导光板的入光侧的底部；基座上设置有光源，用于发光至导光板内，并由导光板来引导出光；反射元件设置在导光板的入光侧的顶部，用于将光源发出的光反射到导光板的入光面上，反射元件包括相连的反射曲面及第一反射平面。本发明的液晶显示装置的工作原理和有益效果与上述的背光模块的具体实施例中描述的相同或相似，具体请参见上述背光模块的具体实施例。
由上述可知，本发明的背光模块和液晶显示装置设置同时具有反射曲面和反射平面的反射元件，提高了背光模块的耦光效率，解决了现有背光模块及液晶显示装置耦光效率较低的技术问题。
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 (19)

  1. 一种背光模块，其中所述背光模块包括：
    导光板；
    基座，设置在所述导光板的一侧；
    光源，设置在所述基座上；以及
    反射元件，用于将所述光源发出的光反射到所述导光板的入光面上，所述反射元件包括相连的反射曲面及第一反射平面；
    所述第一反射平面平行于所述导光板的所述入光面，所述反射曲面包括一曲线斜率逐渐减小的截面曲线；
    所述反射曲面具有第一曲率半径及第二曲率半径，所述第一曲率半径靠近所述导光板，所述第二曲率半径远离所述导光板，所述第二曲率半径大于所述第一曲率半径。
  2. 一种背光模块，其中所述背光模块包括：
    导光板；
    基座，设置在所述导光板的一侧；
    光源，设置在所述基座上；以及
    反射元件，用于将所述光源发出的光反射到所述导光板的入光面上，所述反射元件包括相连的反射曲面及第一反射平面。
  3. 根据权利要求2所述的背光模块，其中所述第一反射平面平行于所述导光板的所述入光面，所述反射曲面包括一曲线斜率逐渐减小的截面曲线。
  4. 根据权利要求2所述的背光模块，其中所述反射元件包括依次相连的第一反射平面、反射曲面以及第二反射平面。
  5. 根据权利要求2所述的背光模块，其中所述反射曲面具有第一曲率半径及第二曲率半径，所述第一曲率半径靠近所述导光板，所述第二曲率半径远离所述导光板，所述第二曲率半径大于所述第一曲率半径。
  6. 根据权利要求4所述的背光模块，其中所述第一反射平面和所述第二反射平面之间的夹角大于90度。
  7. 根据权利要求3所述的背光模块，其中所述截面曲线的曲线斜率变化率小于0.7。
  8. 根据权利要求3所述的背光模块，其中所述截面曲线的曲线斜率的最大值为2至2.5，所述截面曲线的曲线斜率的最小值为0.25至0.3。
  9. 根据权利要求2所述的背光模块，其中所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1。
  10. 根据权利要求4所述的背光模块，其中所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1，所述反射曲面的高度与所述第二反射平面的高度的比值为9至11。
  11. 一种液晶显示装置，其中包括：
    显示面板；以及
    背光模块，包括：
    导光板；
    基座，设置在所述导光板的一侧；
    光源，设置在所述基座上；以及
    反射元件，用于将所述光源发出的光反射到所述导光板的入光面上，所述反射元件包括相连的反射曲面及第一反射平面。
  12. 根据权利要求11所述的液晶显示装置，其中所述第一反射平面平行于所述导光板的所述入光面，所述反射曲面包括一曲线斜率逐渐减小的截面曲线。
  13. 根据权利要求11所述的液晶显示装置，其中所述反射元件包括依次相连的第一反射平面、反射曲面以及第二反射平面。
  14. 根据权利要求11所述的液晶显示装置，其中所述反射曲面具有第一曲率半径及第二曲率半径，所述第一曲率半径靠近所述导光板，所述第二曲率半径远离所述导光板，所述第二曲率半径大于所述第一曲率半径。
  15. 根据权利要求14所述的液晶显示装置，其中所述第一反射平面和所述第二反射平面之间的夹角大于90度。
  16. 根据权利要求12所述的液晶显示装置，其中所述截面曲线的曲线斜率变化率小于0.7。
  17. 根据权利要求12所述的液晶显示装置，其中所述截面曲线的曲线斜率的最大值为2至2.5，所述截面曲线的曲线斜率的最小值为0.25至0.3。
  18. 根据权利要求11所述的液晶显示装置，其中所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1。
  19. 根据权利要求14所述的液晶显示装置，其中所述第一反射平面的高度与所述反射曲面的高度的比值为0.9至1.1，所述反射曲面的高度与所述第二反射平面的高度的比值为9至11。
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