WO2012006808A1 - 背光模块 - Google Patents

背光模块 Download PDF

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Publication number
WO2012006808A1
WO2012006808A1 PCT/CN2010/076816 CN2010076816W WO2012006808A1 WO 2012006808 A1 WO2012006808 A1 WO 2012006808A1 CN 2010076816 W CN2010076816 W CN 2010076816W WO 2012006808 A1 WO2012006808 A1 WO 2012006808A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
light
brightness value
backlight module
value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2010/076816
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English (en)
French (fr)
Inventor
方扩军
郭仪正
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US12/997,483 priority Critical patent/US8730150B2/en
Publication of WO2012006808A1 publication Critical patent/WO2012006808A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a backlight module, and more particularly to a backlight module that can dynamically adjust brightness. Background technique
  • the backlight unit is one of the key components of a liquid crystal display (LCD). Since the liquid crystal itself does not emit light, the function of the backlight module is to supply a sufficient light source with uniform brightness and uniformity. The light mechanism is converted into a high brightness and uniform brightness surface source to provide a backlight source for the liquid crystal display panel.
  • LCD panels are now widely used in electronic products with potential for growth, such as monitors, notebook computers, digital cameras and projectors, especially for large-size panels such as notebook computers and LCD monitors. It is also growing stronger.
  • the liquid crystal display is mainly assembled by components such as a light source (for example, a light-emitting diode:), a reflector (reflector:), a light guide plate, a diffusion sheet, a brightness enhancement film (BEF), and a liquid crystal panel. .
  • a light source for example, a light-emitting diode:
  • a reflector reflector:
  • a light guide plate a diffusion sheet
  • BEF brightness enhancement film
  • liquid crystal panel liquid crystal panel.
  • the light emitted by the light guide plate passes through the homogenizing action of the diffusion sheet and the light collecting action of the prism sheet, thereby improving the brightness and uniformity of the light source, and then injecting the light into the liquid crystal panel.
  • the light guide plate is a wedge-shaped plate having a smooth surface, and the bottom surface has a circular or square diffusion structure. With the help of the reflector, most of the light is transmitted to the thin end by total reflection. When the light hits the diffusing structure on the bottom surface, the reflected light will diffuse at various angles, destroying the total reflection condition and ejecting from the front side of the light guide plate.
  • the diffuser and the different size of the diffused structure pattern design can make the light guide plate uniformly emit light.
  • the brightness of the light guide plate is mainly determined by the brightness of the light generated by the light source.
  • the backlight module partially adjusts the brightness of the light.
  • the single-side light source is dimmed, it is difficult to accurately locate the illumination target area in the distal end region of the light source; while the bilateral side-light source is dimmed, the two sides of the light source affect each other. brightness. Summary of the invention
  • the backlight module includes a light guide plate for guiding light, a first light source group and a second light source group.
  • the bottom surface of the light guide plate has a ridge groove in the middle.
  • the first and second light source groups are respectively disposed on opposite sides of the light guide plate, and the first light source group and the second light source group each include at least one light source, and the first light source group and the first light source group Each source of the second source group is a one-to-one symmetric arrangement.
  • the backlight module electrically connects the first light source group and the second light source group to control the brightness of each light source, wherein the brightness value actually generated by each light source is based on each light source.
  • the predetermined brightness value and the predetermined brightness values of the two light sources on each side of the light source are determined.
  • the transverse groove of the ridge groove has a triangular shape.
  • the bottom surface of the light guide plate is provided with at least one diffusion structure, and the density of the at least one diffusion structure distributed on the bottom surface of the light guide plate is closer to the ridge groove.
  • each light source is actually The generated brightness value is determined according to a predetermined brightness value of the light source minus a first reference value, and the first reference value is equal to a first function value of a predetermined brightness value of the two light sources on both sides of the light source.
  • the predetermined brightness value of the light source is less than the first reference value, the light source actually produces a brightness value of zero.
  • determining, according to a predetermined brightness value of the light source, a second reference value, wherein the second reference value is equal to the first brightness value of two light sources on both sides of the light source The sum of the function value and the second function value of the predetermined brightness value of the opposite source of the light source determines the brightness value actually produced by each light source.
  • the predetermined brightness value of the light source is less than the second reference value, the light source actually produces a brightness value of zero.
  • the predetermined brightness value of the light source is less than the third reference value, the light source actually produces a brightness value of zero.
  • the prior art has the following limitations: Local side dimming of the single side side light type backlight, it is difficult to accurately position the illumination target area for the distal end region of the light source; and the bilateral side light type backlight local dimming, the two side light sources may affect the opposite side area.
  • the bottom surface of the light guide plate of the backlight module of the present invention adopts a ridge-shaped groove in the middle of the light guide plate, and the backlight module is divided into two relatively independent light source regions by using the ridge grooves, and each light source region is further divided into a plurality of light source sub-regions. .
  • the sub-area can control the actual generated brightness value according to a predetermined illumination brightness and distribution to reduce unnecessary power consumption and enhance picture contrast.
  • FIG. 1 is a perspective view of a light guide plate, a first light source group, and a second light source group in a backlight module of the present invention.
  • FIG. 2 is a schematic diagram of a first light source group, a second light source group, and a driving circuit of the backlight module.
  • 3a-3c are flow charts of a method for adjusting the brightness of a light source of a backlight module according to the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The following description of various embodiments is provided to illustrate the specific embodiments of the invention.
  • Directional terms as used in the present invention such as “upper”, “lower”, “previous”, “rear”, “left”, “right”, “top”, “bottom”, “horizontal”, “vertical”, etc. , just refer to the direction of the additional schema. Therefore, the directional terminology is used to describe and understand the invention, and not to limit the invention.
  • FIG. 1 is a perspective view of a light guide plate 110, a first light source group 112 and a second light source group 114 in a backlight module 100 of the present invention.
  • the liquid crystal molecules in the liquid crystal panel adjust the alignment direction of the liquid crystal molecules according to the driving voltage, and the liquid crystal molecules are arranged in different directions to make the liquid crystal panel light. There is a difference in the amount of injection, which will produce different gray levels after filtering through the filter.
  • the backlight module 100 includes a light guide plate 110, a first light source group 112, and a second light source group 114.
  • the first light source group 112 and the second light source group 114 are respectively disposed on opposite sides of the light guide plate 110.
  • the bottom surface of the light guide plate 110 has a ridge groove 124 in the middle, and the cross section of the ridge groove 124 has a triangular shape.
  • the first and second light source groups 112, 114 are respectively disposed on The opposite sides of the ridge groove 124 of the light guide plate 110.
  • the first light source group 112 and the second light source group 114 each include at least one light source 120 and each of the first light source group 112 and the second light source group 114 is in a one-to-one symmetric arrangement.
  • the light from each of the light sources 120 is incident on the light guide plate 110 through the light incident surface 144, and is diffused by the plurality of circular or square diffusion structures 122 on the bottom surface 142 of the light guide plate 110 to be emitted toward the light exit surface 140.
  • the light guide plate 110 can be uniformly illuminated by the pattern design of the dense and different diffusion structures 122.
  • the diffusion structure 122 may also be a granular material having a different refractive index. The light is emitted from the surface of the light guide plate 110 by the scattering action between the light and the particles.
  • FIG. 2 is a schematic diagram of the first light source group 112 , the second light source group 114 , and the driving circuit 116 of the backlight module 100 .
  • Each light source 120 is a light emitting diode.
  • the driving circuit 116 is electrically connected to the first light source group 112 and the second light source group 114 through the circuit boards 130 and 132 for controlling the light emission brightness of each light source 120.
  • Each light source 120 is limited by its illumination angle and intensity such that its effective illumination area is limited to a certain range.
  • the light guide plate 110 is divided into a light-emitting area C corresponding to the first light source group 112 and a light-emitting area D corresponding to the second light source group 114 with the ridge-shaped groove 124 as a boundary.
  • the light-emitting area C can be further divided into light-emitting areas Ci-Cn.
  • the brightness of each light-emitting area Q is mainly controlled by the light source C1 of the first light source group 112, and the light-emitting area D can be further divided into light-emitting areas Di-Dn, each light-emitting area.
  • the brightness is primarily controlled by the light source of the second source group 114.
  • the light source C1 of this embodiment is a light source 120 that is symmetrical with each other.
  • the display brightness of the light-emitting area d is affected not only by the light source d but also by the adjacent light-emitting areas C 1 ⁇ 1 and DD 1 ⁇ 1 . Therefore, the driving circuit 116 of the present invention prejudges according to the driving signal. The predetermined luminance of each of the light-emitting regions Q and the light-emitting regions is determined. The driving circuit 116 further adjusts the light-emitting brightness of each light source C1 according to a predetermined algorithm to achieve dynamic dimming.
  • the illumination brightness is mainly controlled by the light source, and is subjected to both sub-regions. 1 ⁇ 1 , and the opposite sub-region, D 1 ⁇ 1 have different degrees of influence.
  • the average display brightness corresponding to the regions of the light-emitting regions Cw, d, C 1+1 , Dw, and D 1+1 is L'w, ⁇ , L' 1+1 , L", ! , ⁇ , L" 1+1 .
  • the light source generated by each light source is actually in the light-emitting area ( ⁇ ), and the light source c 1+1 , dw, dd 1+ of the adjacent light-emitting area C 1+1 , Dw , D 1+1
  • the predetermined brightness of 1 and the distance with respect to the light source are adjusted.
  • the luminance functions 1 ⁇ 0, f(L' 1+ !) of the same coefficient are used; likewise, since the distances of the light sources ( ⁇ , d 1+1 with respect to the light source C1 are equal, the light source ( ⁇ , The effect of d 1+1 on the luminance of the light-emitting region ( ⁇ is similar, so the luminance functions g (L" ⁇ ), g(L" 1+ !) of the same coefficient are used; in addition, the light source opposite to the light source Cl is opposite to the light-emitting region Q
  • the brightness effect is based on another brightness function hO), where f, g, h represent different brightness functions, so each light source C1 is a predetermined brightness value ⁇ according to each light source, and two light sources next to each light source
  • the actual brightness is determined by the following brightness function: 1 ⁇ 0, f(L' 1+ ! , L g L' O , h(L" , g(L" 1+ !), where f , g and h represent different brightness functions, which are determined by the relative positions of the corresponding sub-areas.
  • the driving circuit 116 receives the light emitting region Q and the adjacent light emitting regions Cw, C 1+1 , Dw, After the predetermined brightness of DD 1+1 , the light source is controlled to adjust the brightness of the light-emitting area ( ⁇ .
  • the driving circuit 116 modulates the actual brightness of the light source C1 according to Equation 1 below:
  • ⁇ represents the reference value of the luminance sub-regions ⁇ , C 1+1 , Dw, and D 1+1 for the light-emitting region Q.
  • ⁇ ⁇ the light source produces a brightness value of 0, that is, no light. If the light-emitting area ( ⁇ is located on both sides, for example, considering the light-emitting area, only the light-emitting areas C 2 , Di, D 2 affect the brightness of the light-emitting area, so the actual brightness modulation of d is:
  • X 'corpse-A L' [f( L' 2 )+ h(L"! + g(L,, 2 )].
  • the driving circuit 116 can also modulate the actual brightness of the light source according to Equation 2 below without considering the influence of the diagonally opposite sub-area:
  • ⁇ denotes the peripheral sub-regions Cw, C 1+1 and the reference value of the light-emitting region Q luminance.
  • the light source ⁇ produces a brightness value of 0, that is, no light. If the light-emitting area Q is located on both sides, for example, considering the light-emitting area, only the light-emitting area C 2 , 0 1 affects the brightness of the light-emitting area, so the actual brightness of the light-emitting area is modulated as:
  • the drive circuit 116 can also modulate the actual brightness of the light source according to Equation 3 below without considering all of the opposite sub-area effects:
  • ⁇ denotes a reference value of the peripheral sub-region C ⁇ Cw to the light-emitting region Q luminance.
  • FIG. 3a - FIG. 3c are flowcharts of a method for adjusting the brightness of a light source of a backlight module according to the present invention.
  • the light source C1 emits light (step S300); determining the actual generated result of each light source according to the brightness value of the light source reservation and the brightness values of the two light sources c 1+1 on both sides of the light source ⁇ Brightness (step S302). Or, as shown in FIG.
  • each light source ⁇ is a predetermined brightness value according to the light source ⁇ , two light sources c 1+1 on both sides of the light source ⁇ , a predetermined brightness value, and a light source ⁇
  • the opposite light source (3 ⁇ 4 predetermined brightness value) determines the brightness value actually generated by each light source ⁇ (step S306). Or, as shown in Fig.
  • the light source C1 emits light (step S308); each light source ⁇ According to the predetermined brightness value of the light source ⁇ , the two light sources c 1+1 on both sides of the light source ⁇ , the predetermined brightness value, the predetermined brightness value of the opposite light source of the light source C1 , and the two light sources d 1+1 on both sides of the opposite light source, predetermined The brightness value determines the brightness value actually generated by the light source (step S310).
  • the driving circuit 116 of the present invention dynamically adjusts the light-emitting brightness of each light source 120, that is, can independently control the brightness of the light-emitting surface of the entire light guide plate 110.
  • the ridge-shaped recess 124 is used in the middle of the light guide plate 110, the brightness of the intermediate portion of the light-emitting surface of the light guide plate 110 can be relatively raised, which is in accordance with human visual habits.

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

Abstract

一种可动态调整亮度的背光模块。背光模块包含用来导引光线的导光板、第一光源组与第二光源组，所述第一及第二光源组分别设置于所述导光板的相对两侧，所述第一光源组和所述第二光源组均包含至少一光源，且所述第一光源组与所述第二光源组的每一光源是一对一对称排列，导光板的底表面中间具有一脊状凹槽。利用脊状凹槽将背光模块划分为两相对独立光源区域，而每一个光源区域又划分为多个光源子区域。子区域可根据预定的发光亮度及分布来控制实际所产生的亮度值，以减少不必要的功耗，增强画面对比度。

Description

背光模块 技术领域
本发明是有关一种背光模块， 更具体来说， 是关于一种可动态调整亮度 的背光模块。 背景技术
背光模块 (Back light unit)为液晶显示器 (Liquid Crystal Display, LCD)的关 键零组件之一， 由于液晶本身不发光， 背光模块的功能即在于供应充足的亮 度与分布均匀的光源， 透过简洁有效光机构转化成高亮度且均一辉度的面光 源， 以提供液晶显示器面板的背光光源。 液晶显示器面板现已广泛应用于监 视器、 笔记本电脑、 数字相机及投影机等具成长潜力的电子产品， 尤以笔记 本电脑及 LCD监视器等大尺寸用面板需求最大， 也因此对于背光模块需求成 长也日趋强烈。
液晶显示器主要由光源 (：例如发光二极管：)、 反射板 (Reflector：)、 导光板 (Light guide plate) 扩散片 (Diffusion sheet) 棱镜片 (Brightness Enhancement Film, BEF)及液晶面板等组件组装而成。 光源射出的光线进入导光板后， 会 利用设于导光板底表面的扩散结构导引射入的光源将其分布成均匀的面光 源， 位于导光板一侧的反射板会将射向反射板方向的光反射回导光板中， 防 止光源外漏， 以增加光的使用效率。 由导光板射出的光线再经扩散片的均光 作用与棱镜片的集光作用， 提高光源的亮度与均匀度后， 再将光线射入液晶 面板内。 导光板是表面光滑的楔形板块， 其底表面有圆形或方形的扩散结构。 通 过反射板的帮助， 大部份的光利用全反射往薄的一端传导。 当光线在底表面 碰到扩散结构时， 反射光会往各个角度扩散， 破坏全反射条件而自导光板正 面射出。 利用疏密、 大小不同的扩散结构图案设计， 可使导光板均匀发光。
导光板的亮度主要还是依据光源产生的光线亮度决定， 为了降低功耗， 背光模块会局部调整发光亮度。 然而单边侧光式的光源在调光时， 在光源远 端区域有难以精确定位照明目标区域的问题；而双边侧光式的光源在调光时， 两侧光源会互相影响对侧区域的亮度。 发明内容
有鉴于此， 本发明解决的技术问题是要提供一种可动态调整亮度的背光 模块。 背光模块包含用来导引光线的导光板、 第一光源组与第二光源组。 所 述导光板的底表面中间具有一脊状凹槽。所述第一及第二光源组分别设置于 所述导光板的相对两侧， 所述第一光源组和所述第二光源组均包含至少一光 源， 且所述第一光源组与所述第二光源组的每一光源是一对一的对称排列。 所述背光模块利用驱动电路， 电性连接所述第一光源组与所述第二光源组， 用来控制每一光源的发光亮度， 其中每一光源实际所产生的亮度值是依据每 一光源预定的亮度值以及每一光源两旁的两个光源预定的亮度值来决定。
依据本发明的实施例， 所述脊状凹槽横切面呈一三角形。 所述导光板 的底表面布设至少一扩散结构， 所述至少一扩散结构的分布于所述导光板底 表面上的密度越靠近所述脊状凹槽越大。
依据本发明的实施例， 依据每一光源的发光亮度， 其中每一光源实际所 产生的亮度值是依据所述光源预定的亮度值减去一第一参考值来决定， 所述 第一参考值等于所述光源两旁的两个光源预定的亮度值的第一函数值。 当所 述光源预定的亮度值小于所述第一参考值时， 所述光源实际所产生的亮度值 为 0。
依据本发明的实施例， 依据所述光源预定的亮度值减去一第二参考值来 决定， 其中所述第二参考值等于所述光源两旁的两个光源预定的亮度值的所 述第一函数值和所述光源的对面光源预定的亮度值的第二函数值的和， 来决 定每一光源实际所产生的亮度值。 当所述光源预定的亮度值小于所述第二参 考值时， 所述光源实际所产生的亮度值为 0。
依据本发明的实施例， 依据所述光源预定的亮度值减去一第三参考值来 决定， 其中所述第三参考值等于所述光源两旁的两个光源预定的亮度值的所 述第一函数值、 所述光源的对面光源预定的亮度值的所述第二函数值、 以及 所述对面光源的两旁的两个光源预定的亮度值的第三函数值的和， 来决定每 一光源实际所产生的亮度值。 当所述光源预定的亮度值小于所述第三参考值 时， 所述光源实际所产生的亮度值为 0。
现有技术存在以下局限： 单边侧光式背光局部调光， 对光源远端区域 难以精确定位照明目标区域； 而双边侧光式背光局部调光， 两侧光源会互相 影响对侧区域。 基于此， 本发明背光模块的导光板的底表面中间采用一脊 状凹槽， 利用脊状凹槽将背光模块划分为两相对独立光源区域， 而每一个 光源区域又划分为多个光源子区域。 子区域可根据预定的发光亮度及分布来 控制实际所产生的亮度值， 以减少不必要功耗， 增强画面对比度。 为让本发明的上述内容能更明显易懂， 下文特举一较佳实施例， 并配合 所附图式， 作详细说明如下： 附图说明
图 1绘示本发明的背光模块中， 导光板、 第一光源组与第二光源组的立体透 视图。
图 2绘示背光模块的第一光源组、 第二光源组与驱动电路的示意图。
图 3a-图 3c是本发明调整背光模块的光源亮度的方法流程图。 具体实施方式 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之 特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、 「右」、 「顶」、 「底」、 「水平」、 「垂直」 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。
请参阅图 1， 图 1绘示本发明的背光模块 100中， 导光板 110、 第一光源组 112与第二光源组 114的立体透视图。在液晶显示器中， 背光模块 100产生的光 线射入液晶面板后， 液晶面板内的液晶分子会依据驱动电压的不同， 调整其 中液晶分子的排列方向， 而不同的液晶分子排列方向会使得液晶面板光线射 出量有所差异， 透过滤光片滤光后会产生不同的灰阶。背光模块 100包括导光 板 110、 第一光源组 112和第二光源组 114。 第一光源组 112和第二光源组 114分 别设置于导光板 110的相对两侧。 导光板 110的底表面中间呈脊状凹槽 124， 脊状凹槽 124的横切面呈一三角形。第一及第二光源组 112、 114分别设置于 导光板 110脊状凹槽 124的相对两侧。 第一光源组 112和第二光源组 114皆包含 至少一光源 120且第一光源组 112与第二光源组 114的每一光源 120是一对一的 对称排列。每一光源 120的光线由入光面 144射入导光板 110，再经过导光板 110 底表面 142的数个圆形或方形的扩散结构 122扩散而向出光面 140射出。越靠近 脊状凹槽 124， 扩散结构 122的密度越大。 当光线在底表面 142碰到扩散结 构 122时， 反射光会往各个角度扩散， 破坏全反射条件而自导光板 110的出光 面 140向上射出， 如箭头 A所示。 利用疏密、 大小不同的扩散结构 122图案设 计， 可使导光板 110均匀发光。 扩散结构 122也可以是不同折射率的颗粒状材 质。 利用光与颗粒间的散射作用， 让光自导光板 110表面射出。
请一并参阅图 1与图 2， 图 2绘示背光模块 100的第一光源组 112、第二 光源组 114与驱动电路 116的示意图。 每一光源 120是发光二极管。 驱动电 路 116透过电路板 130和 132电性连接第一光源组 112与第二光源组 114以 用来控制每一光源 120的发光亮度。 每一光源 120受限于它的发光角度和强 度， 使得其有效发光区域会局限在一定的范围内。 为便于说明， 在本实施例 中， 导光板 110以脊状凹槽 124为边界， 分成对应于第一光源组 112的发 光区域 C和对应于第二光源组 114的发光区域 D。 其中发光区域 C又可划分 成发光区域 Ci-Cn， 每一发光区域 Q的亮度主要由第一光源组 112的光源 Cl 控制， 发光区域 D又可划分成发光区域 Di-Dn， 每一发光区域 的亮度主要 由第二光源组 114的光源 控制。 本实施例的光源 Cl、 是相互对称的光源 120。
发光区域 d的显示亮度不仅受到光源 d的影响， 同时受临近发光区域 C1±1、 D D1±1的影响。 因此， 本发明的驱动电路 116会预先根据驱动信号判 定各个发光区域 Q、 发光区域 预定的亮度。 驱动电路 116再根据预定的算 法适当调整每一光源 Cl、 的发光亮度， 即可达到动态调光目的。
以发光区域 Q为例， 其照明亮度主要受光源^控制， 同时受到两侧子区 域。1±1， 及对侧子区域 , D1±1不同程度影响。在一帧图像扫描时段内， 发光 区域 Cw、 d、 C1+1、 Dw、 、 D1+1区域分别对应的平均显示亮度为 L'w、 Ι 、 L'1+1、 L",! , Ι 、 L"1+1。 每一光源 实际在发光区域(^所产生的亮度值会参 考该发光区域 (^的相邻发光区域 C1+1、 Dw、 、 D1+1的光源 c1+1、 dw、 d d1+1的预定亮度以及相对于该光源 的距离来调整。 举例来说， 由于 光源 cw、 c1+1相对于该光源 Cl的距离相等， 所以光源 cw、 c1+1对发光区域 d 的亮度影响也是类似的， 因此采用相同系数的亮度函数 1^0、 f(L'1+！); 同 样地， 由于光源（^、 d1+1相对于该光源 Cl的距离相等， 所以光源（^、 d1+1对 发光区域(^的亮度影响也是类似的，因此采用相同系数的亮度函数 g(L"^) 、 g(L"1+！); 此外， 光源 Cl对面的光源 对发光区域 Q的亮度影响是采用另一亮 度函数 hO ), 其中 f 、 g 、 h表示不同的亮度函数。所以每一光源 Cl是依据 每一光源^预定的亮度值 Ι 、 每一光源 ^两旁的两个光源 c1+1、 预定的亮 度函数 1^0、 f(L'1+！), 每一光源 Cl的对面光源（¾预定的亮度函数 hO )以 及所述对面光源 的两旁的两个光源 d1+1、 d,!预定的亮度值 g L'^：)、 g(L"1+！), 来决定每一光源 实际所产生的亮度 X、。
综上所述， 实际 亮度由以下亮度函数所决定： 1^0、 f(L'1+！) 、 L g L' O 、 h(L" 、 g(L"1+！), 其中 f 、 g 、 h表示不同的亮度函数， 由对应的 子区域的相对位置决定。
驱动电路 116在接收到发光区域 Q以及邻近的发光区域 Cw、 C1+1、 Dw、 D D1+1的预定亮度后， 会控制光源 以调整发光区域 (^的亮度。 驱动电路 116会依据以下的方程式 1将光源 Cl实际亮度调制为：
X = L -A = -[ f(VlA) + f(L，1+1)+ g(L"1-1)+ h(L" + g(L"1+！)]， （方程式 1) 当 AL'^I 时， ΧΊ=0
其中 ΔΙ 表示周边子区域^^、 C1+1、 Dw、 、 D1+1对发光区域 Q亮度参 考值。 当 ΔΙ ≥Ι 时，光源 产生的亮度值为 0， 也就是不发光。 如果发光区 域(^位于两侧，例如考虑发光区域 时，发光区域 仅有发光区域 C2、 Di、 D2影响其亮度， 所以 d实际亮度调制为： X '尸 -A = L' [f(L'2)+ h(L"!) + g(L，，2)]。
驱动电路 116也可以不考虑斜对侧子区域影响， 而依据以下的方程式 2 将光源 实际亮度调制为：
Y'1= -A = -[ f( A) + f(L'1+1)+ h(L" ] , (方程式 2)
当 AL'^I 时， ΥΊ=0
其中 ΔΙ 表示周边子区域 Cw、 C1+1、 对发光区域 Q亮度参考值。 当 ΔΙ ≥Ι 时，光源 ^产生的亮度值为 0， 也就是不发光。 如果发光区域 Q位于 两侧， 例如考虑发光区域 时， 发光区域 仅有发光区域 C2、 01影响其亮 度， 所以发光区域 实际亮度调制为：
Y，尸 -A = L' [f(L'2)+ h(L"!)] 。
驱动电路 116还可以不考虑所有对侧子区域影响，而依据以下的方程式 3将光源 实际亮度调制为：
Z = -A = L'r[ f(Vl ) + f(L，1+1)]， （方程式 3)
当 AL'^I 时， Z =0 其中 ΔΙ 表示周边子区域 C^Cw对发光区域 Q亮度参考值。当 ΔΙ ≥Ι 时，光源 ^产生的亮度值为 0， 也就是不发光。 如果发光区域 Q位于两侧， 例如考虑发光区域 时， 发光区域 仅有 C2影响其亮度， 所以发光区域 d 实际亮度调制为： Z'尸 L -AL = ΙΛ-ί·(ΐ 2)。
请参阅图 3a-图 3c， 图 3a-图 3c是本发明调整背光模块的光源亮度的方法流 程图。 如图 3a所示， 光源 Cl发光 (歩骤 S300); 依据光源 预订的亮度值以及光 源^的两旁的两个光源 c1+1 预订的亮度值， 来决定每一光源 ^发实际所 产生的亮度 (歩骤 S302)。 或者， 如图 3b所示， 光源 Cl发光 (歩骤 S304); 每一光 源^是依据光源 ^预定的亮度值、光源 ^两旁的两个光源 c1+1、 预定的亮度值、 以及光源^的对面光源 (¾预定的亮度值， 来决定每一光源^在实际所产生的亮 度值 (歩骤 S306)。 或者， 如图 3c所示， 光源 Cl发光 (歩骤 S308); 每一光源^是依 据光源 ^预定的亮度值、 光源 ^两旁的两个光源 c1+1、 预定的亮度值、 光源 Cl 的对面光源 预定的亮度值以及对面光源 的两旁的两个光源 d1+1、 预定的 亮度值， 来决定光源 实际所产生的亮度值 (歩骤 S310)。
由于导光板 110中间的脊状凹槽 124将光源 120照明距离减少为没有利用 该中间的脊状凹槽 124的一半， 且可以使两光源 120照明区域相对独立地分开 两区进行控制， 再配合本发明的驱动电路 116动态调整各个光源 120的发光亮 度， 即能对整个导光板 110的出光面的亮度进行独立分区控制。 同时， 由于导 光板 110中间的采用脊状凹槽 124，可相对提升导光板 110的出光面的中间区域 亮度， 符合人眼视觉习惯。
综上所述， 虽然本发明已以较佳实施例揭露如上， 但该较佳实施例并非 用以限制本发明， 该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(

Claims

权 利 要 求
1. 一种背光模块，其包含用来导引光线的导光板、第一光源组与第二光源组， 所述第一及第二光源组分别设置于所述导光板的相对两侧，所述第一光源 组和所述第二光源组皆包含至少一光源，且所述第一光源组与所述第二光 源组的每一光源是一对一的对称排列； 其特征在于：
所述导光板的底表面中间具有一脊状凹槽。
2. 根据权利要求 1 所述的背光模块， 其特征在于： 所述脊状凹槽横切面呈 一三角形。
3. 根据权利要求 1或 2所述的背光模块， 其特征在于： 所述导光板的底表面 布设至少一扩散结构，所述至少一扩散结构的分布于所述导光板底表面上 的密度越靠近所述脊状凹槽越大。
4. 根据权利要求 1所述的背光模块， 其特征在于： 所述背光模块另包含： 驱 动电路， 电性连接所述第一光源组与所述第二光源组， 用来控制每一光源 的发光亮度，其中每一光源实际所产生的亮度值是依据所述光源预定的亮 度值以及所述光源两旁的两个光源预定的亮度值来决定。
5. 根据权利要求 4所述的背光模块， 其特征在于： 所述背光模块另包含： 所 述驱动电路用来控制每一光源的发光亮度，其中每一光源实际所产生的亮 度值是依据所述光源预定的亮度值减去一第一参考值来决定，所述第一参 考值等于所述光源两旁的两个光源预定的亮度值的第一函数值。
6. 根据权利要求 5所述的背光模块， 其特征在于： 当所述光源预定的亮度值 小于所述第一参考值时， 所述光源实际所产生的亮度值为 0。
7. 根据权利要求 4所述的背光模块， 其特征在于： 每一光源实际所产生的亮 度值是依据所述光源预定的亮度值、 所述光源两旁的两个光源预定的亮度 值以及所述光源的对面光源预定的亮度值来决定。
8. 根据权利要求 7所述的背光模块， 其特征在于： 每一光源实际所产生的亮 度值是依据所述光源预定的亮度值减去一第二参考值来决定， 其中所述第 二参考值等于所述光源两旁的两个光源预定的亮度值的所述第一函数值 和所述光源的对面光源预定的亮度值的第二函数值的和。
9. 根据权利要求 8所述的背光模块， 其特征在于： 当所述光源预定的亮度值 小于所述第二参考值时， 所述光源实际所产生的亮度值为 0。
10. 根据权利要求 7所述的背光模块， 其特征在于： 每一光源实际所产生的 亮度值是依据所述光源预定的亮度值、 所述光源两旁的两个光源预定的亮 度值、 所述光源的对面光源预定的亮度值以及所述对面光源的两旁的两个 光源预定的亮度值来决定。
11. 根据权利要求 10所述的背光模块， 其特征在于： 每一光源实际所产生的 亮度值是依据所述光源预定的亮度值减去一第三参考值来决定， 其中所述 第三参考值等于所述光源两旁的两个光源预定的亮度值的所述第一函数 值、 所述光源的对面光源预定的亮度值的所述第二函数值、 以及所述对面 光源的两旁的两个光源预定的亮度值的第三函数值的和。
12. 根据权利要求 11所述的背光模块， 其特征在于： 當所述光源预定的亮度 值小於所述第三参考值時， 所述光源实际所产生的亮度值为 0。
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