WO2012012956A1 - 侧光式背光模块与使用该背光模块的液晶显示器 - Google Patents

侧光式背光模块与使用该背光模块的液晶显示器 Download PDF

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Publication number
WO2012012956A1
WO2012012956A1 PCT/CN2010/076554 CN2010076554W WO2012012956A1 WO 2012012956 A1 WO2012012956 A1 WO 2012012956A1 CN 2010076554 W CN2010076554 W CN 2010076554W WO 2012012956 A1 WO2012012956 A1 WO 2012012956A1
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WO
WIPO (PCT)
Prior art keywords
light guide
regions
guide plate
liquid crystal
backlight module
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Application number
PCT/CN2010/076554
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English (en)
French (fr)
Inventor
贺成明
郭仪正
任杰
Original Assignee
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 US12/995,737 priority Critical patent/US20120026423A1/en
Publication of WO2012012956A1 publication Critical patent/WO2012012956A1/zh

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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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G02B6/008—Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to a liquid crystal display technology, and more particularly to an edge-lit backlight module for a liquid crystal display that can achieve good local dimming, and a liquid crystal using the edge-lit backlight module. monitor.
  • the Backlight Module is one of the key components that determine the quality of the LCD display.
  • the illumination source used by the backlight module includes an electroluminescence source (Electro Luminance; EL), a light emitting diode (LED), and a cold cathode fluorescent lamp.
  • LEDs are widely used in small liquid crystal display devices due to their small size, light weight, and easy control.
  • the LED backlight module can be divided into a direct type and a side light type according to the configuration of the LED light source.
  • the direct-lit LED backlight module uniformly disposes the LED dies under the liquid crystal panel as a light source, so that the backlight can be uniformly transmitted to the entire screen.
  • FIG. 1 is a schematic diagram of an application example of a direct-lit LED backlight module of the prior art. For the sake of brevity, several components are omitted from the figure.
  • a liquid crystal display in a liquid crystal glass 10 below, there is a light source composed of an LED array 20 having a plurality of LED dies 201 arranged in rows and columns.
  • the liquid crystal glass 10 is a glass in which a liquid crystal film is interposed, and the application level has become wider and wider. Since this is not the focus of the present invention, it will not be described here.
  • a plurality of LED dies 201 are arranged directly under the liquid crystal glass 10 to provide illuminating light to the liquid crystal glass 10, and area dimming can be easily realized.
  • the liquid crystal glass 10 is divided into areas of Al to A6, B1 to: B6, C1 to C6, and D1 to D6.
  • the area dimming of each area can be achieved by controlling the LEDs corresponding to the respective areas.
  • the LED module 20 can directly transfer heat to the backing plate (not shown) for the purpose of heat dissipation.
  • the number of LED dies required in this manner is large and consumes a large amount of power.
  • the assembled liquid crystal display (not shown) has a thick overall thickness.
  • LED strips 22 and 24 are respectively disposed on the two long sides of the liquid crystal glass 11.
  • the LED strip 24 there are a plurality of LED dies 241.
  • the LED strips 22 are used to control the brightness of the areas A1 to A6 of the liquid crystal glass 11, and the LED strips 24 are used to control the areas B1 to B6 of the liquid crystal glass 11.
  • the edge-lit LED backlight module requires a small number of LED dies, but in this configuration, since only the LED strips 22, 24 mounted on both sides of the liquid crystal glass 11 provide illumination, the LED dies are illuminated. The range is limited, so the number of areas that can be adjusted for light and dark is much less than that of the direct type backlight module shown in FIG.
  • a primary object of the present invention is to provide an edge-lit backlight module that achieves the goal of providing multi-zone dimming with limited power consumption.
  • Another object of the present invention is to provide a liquid crystal display having a one-side optical backlight module capable of providing multi-region dimming with limited power consumption.
  • an edge-lit backlight module includes: a light guide plate divided into a plurality of regions, wherein the light guide plates formed in the plurality of regions are stepped such that each region has one side exposed; and a plurality of light sources, each of the light sources being disposed on the guide The side exposed by one of several areas of the light panel is used to illuminate the area.
  • the top surface and the bottom surface of the light guide plate formed by the plurality of regions are stepped, and the two adjacent regions having a stepped connection with different horizontal planes have overlapping portions. .
  • the top or bottom surface of the light guide plate formed by the plurality of regions is stepped, and the other surface is flat, such that portions of each region having one side are exposed.
  • One of the two adjacent regions of the light guide plate has a groove on the side for fitting with another region, and the remaining portion of the side is exposed, which is retained
  • the thickness is defined to define a space sufficient to set the source.
  • adjacent regions of the light guide plate and adjacent regions of the light guide plate may be separated from each other by providing a reflective layer.
  • the light source is implemented by an LED light bar.
  • a liquid crystal display having a liquid crystal panel and the aforementioned backlight module is provided.
  • the liquid crystal display further has a backing plate configured to be stepped to accommodate the light guide plate and the plurality of light sources.
  • FIG. 1 is a schematic diagram of an application example of a direct-lit LED backlight module of the prior art.
  • FIG. 2 is a schematic view showing an application example of a side-lit LED backlight module of the prior art.
  • FIG. 3 is a perspective view of the edge-lit backlight module of the first embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view of the edge-lit backlight module of FIG. 3.
  • FIG. 5 is a schematic cross-sectional view of an edge-lit backlight module according to a second embodiment of the present invention.
  • Figure 6 is a perspective view showing the mating of the edge-lit backlight module of the present invention and the back panel of the liquid crystal display.
  • FIG. 7 is a schematic cross-sectional view of an edge-lit backlight module according to a third embodiment of the present invention.
  • a liquid crystal display includes at least a liquid crystal panel (such as a liquid crystal glass) and a backlight module, wherein the backlight module is used to provide liquid crystal panel illumination.
  • Backlight modules typically include a light source, a light guide, and other optical films, such as reflective sheets, diffusers, polarizers, and the like.
  • the light guide plate is generally a light transmissive material, such as optical acryl, for the purpose of evenly distributing light from the light source to the display panel of the liquid crystal display.
  • the foregoing structure may be disposed on a back plate of the liquid crystal display.
  • the invention mainly aims at achieving the multi-region dimming effect by designing the special geometric structure of the light guide plate and the special setting of the light source without greatly increasing the power consumption.
  • FIG. 3 is a perspective view of the edge-lit backlight module according to the first embodiment of the present invention
  • FIG. 4 is a schematic cross-sectional view of the edge-lit backlight module.
  • a light guide plate
  • LGP 100 Light Guide Plate; LGP
  • LGP Light Guide Plate 100 is divided into several areas, as shown in the following four areas: A area 110, B area 120, C area 130, D area 140.
  • the light guide plate regions 110 to 140 are not arranged on the same plane, and at least two adjacent regions are arranged in the horizontal direction to have a height difference with each other, that is, a stepped shape, for example, the A region 110 and The B zone 120 is stepped, wherein the A zone 110 is at a higher level, and the B zone 120 is at a lower level; and the C zone 130 and the D zone 140 are also stepped, wherein the D zone 140 is at a higher level, and the C zone is 130 is at a lower level.
  • adjacent B zones 120 and C zones 130 are arranged side by side on the same horizontal plane.
  • light sources can be disposed on the sides of each of the regions.
  • a strip light source such as an LED strip 210 is disposed on the side of the A area 110.
  • the vacating space can be provided with a strip light source such as the LED light bar 220 on the side of the B zone 120.
  • an LED strip 240 is disposed on the side of the D zone 140. Because the C zone 130 has a height difference from the D zone 140, the vacating space allows the LED strip 230 to be disposed on the side of the C zone 130.
  • each zone A zone 110, zone B 120, zone C 130, and zone D 140 is related to the illumination range of the light source (i.e., light bars 210, 220, 230, 240).
  • the space can be manufactured so as to install light sources such as LED strips on the sides of the respective regions, and the dimming of each region is controlled by corresponding The light source is achieved, and therefore, a large-area backlight module can be manufactured while achieving good area dimming.
  • the edge-lit backlight module according to the present invention does not require the use of such a large number of light source units such as LED dies as compared with conventional direct-lit backlight modules, thereby reducing power consumption.
  • the light guide plate 100 is composed of four regions: an A region 110, a B region 120, a C region 130, and a D region 140, wherein the A region 110 is adjacent to the B region 120, and the A region 110 is Located in a higher horizontal plane and the B zone 120 is located at a lower level; the B zone 120 is adjacent to the C zone 130 and is located at the same horizontal plane (low horizontal plane); the C zone 130 is adjacent to the D zone 140, and the C zone 130 is lower.
  • the horizontal plane and the D zone 140 are located at a higher horizontal plane, while the D zone 140 and the A zone 110 are at the same horizontal plane (high horizontal plane).
  • the junction between the B region 120 and the A region 110 exhibits a phenomenon in which the A region 110 overlaps with the B region 120.
  • the B region 120 in addition to the LED strip 220 corresponding to the B region, it is still affected by the LED strip 210 corresponding to the A region, because the illumination range of the LED strip 210 should be And at the end of Area A 110, that is, where it overlaps with Area B 120.
  • the portion overlapping the B area 120 in addition to the LED strip 210 corresponding to the A area, is also affected by the LED strip 220 of the B area, thereby causing a phenomenon of light mixing.
  • the light of the light source of the B region 120 (ie, the LED strip 220) from entering the A region 110
  • the light of the light source of the A region 110 does not enter the B region 120, in this embodiment.
  • the reflective layer 115 is spaced apart from the B region 120 at the bottom surface of the A region 110 and at the side opposite to one end of the LED light bar 210 (ie, one end of the overlapping portion).
  • the bottom surface of the D region 140 and the side surface of one end of the overlapping portion are also provided with a reflective layer 135. With the arrangement of the reflective layer 115, the overlapping portions of the A region 110 and the B region 120 are separated from each other.
  • the overlapping portions of the C region 130 and the D region 140 are separated from each other.
  • the abutting faces of the B region 120 and the C region 130 may also be separated from one another by a reflective layer 125 to prevent the respective source light from interfering with each other.
  • the A zone 110, the B zone 120, the C zone 130, and the D zone 140 can form a continuous planar light source that can be independently controlled by each zone.
  • the back panel of the liquid crystal display (not shown) can be configured as a special according to the bottom contour of the light guide plate 100 of the step-like edge-lit backlight module. Shape, with the plastic frame to achieve the fixation of the light guide plate 100, as shown in Figure 6.
  • the figure is a perspective view of the edge-lit backlight module of the present invention mated with the back panel of the liquid crystal display.
  • the back plate 50 of the liquid crystal display is formed in a stepped shape, and defines a stepped accommodating space, which can accommodate the stepped light guide plate 100 and the side of each of the regions 110 to 140 disposed on the light guide plate 100.
  • a plurality of LED strips 210 to 240 can be configured as a special according to the bottom contour of the light guide plate 100 of the step-like edge-lit backlight module. Shape, with the plastic frame to achieve the fixation of the light guide plate 100, as shown in Figure 6.
  • the figure is a perspective view of the edge-lit backlight module of the present invention mated with the back panel of the
  • the backlight module has a light guide plate 300, and the light guide plate 300 is composed of four regions: A region 310, B region 320, C region 330, and D region 340, and a light source such as an LED is disposed on a side of each region.
  • Light bars 410, 420, 430 and 440 are disposed on a side of each region.
  • the B region 320 has a thicker thickness, and the left side has a recess 324 for fitting with the A region 320.
  • the top of the A region 310 and the B region 320 The surface is flat, and because of the thickness, the bottom surfaces of the A region 310 and the B region 320 are stepped.
  • the side below the recess 324 of the B region 320 (the left side in the figure) is exposed, and the thickness remaining below the recess 324 of the B region 320 is sufficient to be available on the left side of the B region 320 while being
  • An LED strip 420 is disposed below the A area 310 for illumination of the B area.
  • the thickness of the C region 320 is thicker than that of the D region 340, and one side (the right side in the figure) has a groove 334 for fitting with the D region 340.
  • the D region 340 The top surface with the C region 330 is flat, and the bottom surfaces of the D region 340 and the C region 330 are stepped due to the difference in thickness.
  • the side below the recess 334 of the C-zone 330 (the right side in the figure) is exposed, and the thickness of the recess 334 below the C-zone 330 is sufficient to allow the right side of the C-zone 330 to be the same
  • the LED strip 430 is disposed below the D area 340 for illumination of the C area.
  • the B region 320 and the C region 330 have the same thickness and are mirror-symmetrical to each other.
  • the light guide plate 300 makes the light guide plate 300 stronger and easier to fix. It should be noted that in the above description, although the light guide plate 300 has a flat top surface and a bottom surface stepped, the reverse is also possible. That is, it may be that the top surface is stepped and the bottom surface is flat. Further, the four light guide plate regions of such a structure can also be integrally formed. Further, as in the previous embodiment, the reflection layer may be used in the overlapping portion of the area to prevent the light mixing phenomenon, and the manner is the same, and will not be described herein.
  • the top surface of the light guide plate 300 of the edge-lit backlight module of the present embodiment is flat, like a general light guide plate, and the bottom surface is stepped, and the space generated by the step shape is installed for respectively The LED strips 420 and 430 of the B zone 320 and the C zone 330 are illuminated.
  • the edge light type light guide plate of the present invention may be composed of three regions, or may be composed of four or more.
  • the composition of the area may be composed of three regions, or may be composed of four or more.

Description

侧光式背光模块与使用该背光模块的液晶显示器
【技术领域】
本发明有关于一种液晶显示技术， 特别是有关于一种用于液晶显示器， 可实现良好的区域调光（Local Dimming ) 的侧光式背光模块， 及使用此种侧 光式背光模块的液晶显示器。
【背景技术】
现今液晶显示器已成为显示技术的主流， 广泛应用于各种电子产品， 诸 如行动电话、 个人数字助理（PDA)、 数字相机、 计算机屏幕或笔记型计算机 屏幕等等。 其中背光模块（Backlight Module) 为决定液晶显示器显示质量的 关键组件之一。一般来说，背光模块使用的照明光源包含电致发光源（Electro Luminance; EL)、 发光二极管 （Light Emitted Diode; LED ), 冷阴极荧光灯
( Cold Cathode Fluorescent Lamp; CCFL) 等三种。 其中 LED因其体积小、 重量轻以及易于控制等优点而大量使用于小型液晶显示装置。
LED背光模块依照 LED光源的配置可分为直下式与侧光式。 其中直下 式 LED背光模块是将 LED晶粒均匀配置在液晶面板下作为光源， 使背光可 以均匀传送到整个屏幕。
图 1为习知技术之直下式 LED背光模块的应用例示意图。为简明扼要起 见， 图中省略了若干组件。 如图所示， 于液晶显示器中， 在一液晶玻璃 10 的下方， 有 LED数组 20所构成的光源， 该 LED数组 20具有呈行列排列的 多个 LED晶粒 201。 液晶玻璃 10是中间夹有液晶膜的玻璃， 应用的层面已 经愈来愈广。 由于此非本发明的重点， 在此不予赘述。
在此种结构中， 众多 LED晶粒 201排列在液晶玻璃 10正下方以提供照 明光给液晶玻璃 10，可轻易实现区域调光。于本例中，液晶玻璃 10分为 Al〜 A6、 B1〜： B6、 C1〜C6、 D1〜D6等区域。 藉由控制各个区域对应的 LED, 可达成各个区域的区域调光。 又， LED模块 20可直接将热传递至背板 （未 图示）达成散热的目的。 然而， 此种方式所需要的 LED晶粒数量繁多， 消耗 功率大， 此外， 因为多了一层 LED数组 20， 因此组装后的液晶显示器 （未 图示）， 其整体的厚度会较厚。
图 2为习知技术之侧光式 LED背光模块的应用例示意图。如图所示， 是 在液晶玻璃 11的两个长侧边分别设置 LED灯条 22、 24。 以 LED灯条 24为 例， 系具有若干 LED晶粒 241。 于本例中， LED灯条 22是用来控制液晶玻 璃 11的区域 A1〜A6的亮度， 而 LED灯条 24是用来控制液晶玻璃 11的区 域 B1〜B6。 侧光式 LED背光模块所需要的 LED晶粒数量较少， 但是， 在此 种结构中， 由于只有安装在液晶玻璃 11两侧的 LED灯条 22、 24提供照明， 而各 LED晶粒照明的范围是有限的，因此可以调节明暗的区域数量相较于图 1所示的直下式背光模块少了许多。
故， 有必要提供一种改良的背光模块， 以解决现有技术所存在的问题。 【发明内容】
本发明的主要目的在于提供一种侧光式背光模块， 其能以有限的功率消 耗达到提供多区域调光的目的。
本发明的另一目的在于提供一种液晶显示器，其具有一侧光式背光模块， 其能以有限的功率消耗达到提供多区域调光的目的。
为达成本发明的前述目的， 提供一种侧光式背光模块。 所述侧光式背光 模块包含： 一导光板， 分成若干区域， 该若干区域构成之导光板呈阶梯状， 使得各区域具有一侧边暴露出来； 及若干光源， 各光源是设置于所述导光 板的若干区域其中之一所暴露出来的侧边处， 用于照明该区域。
根据本发明， 于一实施例中， 所述若干区域构成之导光板的顶表面及底 表面皆呈阶梯状， 以高低不同水平面呈阶梯状连接配置的所述两个相邻区 域具有重叠部份。
于另一实施例，所述若干区域构成之导光板的顶表面或底表面呈阶梯状， 而另一表面呈平坦状， 使得各区域具有一侧边的部份暴露出来。 所述导光板 的所述若干区域中两个相邻区域的其中一个在该侧边具有一凹槽， 用于与另 一区域嵌合， 而该侧边的其余部份暴露出来， 其所保留的厚度是可界定出一 空间足以设置该光源。
根据本发明， 于所述侧光式背光模块中， 所述导光板之相邻区域重叠部 份， 还有导光板的相邻区域均可通过设置反射层相互隔开。
根据本发明，于所述侧光式背光模块中，所述的光源是以 LED灯条实施。 为达成本发明的前述目的， 提供一种液晶显示器， 具有一液晶面板与前 述之背光模块。
所述液晶显示器尚具有一背板，该背板构成为阶梯状以适于容置该导光 板以及所述若干光源。
为让本发明的上述内容能更明显易懂， 下文特举较佳实施例， 并配合所 附图式， 作详细说明如下：
【附图说明】
图 1是习知技术之直下式 LED背光模块的应用例示意图。
图 2是习知技术之侧光式 LED背光模块的应用例示意图。
图 3是本发明第一实施例之侧光式背光模块的立体示意图。
图 4是图 3之侧光式背光模块的截面示意图。
图 5是本发明第二实施例之侧光式背光模块的截面示意图。
图 6 是本发明之侧光式背光模块与液晶显示器的背板配合的立体示意 图。
图 7是本发明第三实施例之侧光式背光模块的截面示意图。
【具体实施方式】
为让本发明上述目的、 特征及优点更明显易懂， 下文特举本发明较佳实 施例， 并配合附图， 作详细说明如下。 再者， 本发明所提到的方向用语， 例 如「上」、 「下」、 「前」、 「后」、 「左」、 「右」、 「内」、 「外」、 「侧」、 「底」、 「顶」 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。
一般来说， 液晶显示器至少包含液晶面板 （如液晶玻璃） 与背光模块， 其中背光模块是用于提供液晶面板照明。 背光模块通常包含光源、 导光板以 及其它光学膜片， 诸如反射片、 扩散片、 偏光板等等。 导光板一般为透光材 质， 例如光学压克力， 用途是使得来自光源的光均匀散布到液晶显示器的显 示面板。 前述结构可设置于液晶显示器的一背板上。 本发明主要是藉由设计 导光板的特殊几何构造， 搭配光源的特殊设置， 以达成多区域调光的功效而 不会大幅增加功率消耗。
请参见图 3与图 4， 图 3是本发明第一实施例之侧光式背光模块的立体 示意图， 而图 4为该侧光式背光模块的截面示意图。 根据本发明， 一导光板
(Light Guide Plate; LGP) 100是分成若干区域， 如图中所示的四个区域： A区 110、 B区 120、 C区 130、 D区 140。 与传统导光板不同的， 这些导光 板区域 110〜140不是排列在同一个平面上，至少其中两个相邻区域在水平方 向配置成彼此有高低落差， 亦即呈现阶梯状， 例如 A区 110与 B区 120呈现 阶梯状， 其中 A区 110处于较高水平面， 而 B区 120处于较低水平面； 而 C 区 130与 D区 140亦呈现阶梯状， 其中 D区 140处于较高水平面， 而 C区 130处于较低水平面。 在本实施例中， 相邻的 B区 120与 C区 130是并排配 置于同一水平面。 根据本发明， 藉由将导光板 100的多个区域以高低不同的水平面排列配 置， 而使得可在每个区域的侧边都设置光源。 如图中所示， 于 A区 110的侧 边设置条形光源， 如 LED灯条 210。 而 B区 120因为与 A区 110有高低落 差， 因此腾出空间得以在 B区 120的侧边设置条形光源， 如 LED灯条 220。 同理， 在 D区 140的侧边设置有 LED灯条 240， 因为 C区 130因为与 D区 140有高低落差， 因此腾出空间得以在 C区 130的侧边设置 LED灯条 230。
各区域 A区 110、 B区 120、 C区 130、 D区 140的宽度大小是与光源（即 灯条 210、 220、 230、 240) 的照明范围有关。
藉由将导光板分成多个区域， 并以高低不同的水平面呈阶梯状配置， 从 而可制造空间以便在各个区域的侧边都装设光源如 LED灯条，各区域的调光 通过控制对应的光源达成， 因此， 能制造大面积的背光模块同时能达成良好 的区域调光。 甚且， 与传统的直下式背光模块相比， 根据本发明的侧光式背 光模块不需要使用如此大量的光源单位如 LED晶粒， 因此可减低功率消耗。
图 5是本发明第二实施例之侧光式背光模块的截面示意图， 其中相同的 标号是指相同的组件。如同前一实施例所述， 导光板 100是由四个区域组成： A区 110、 B区 120、 C区 130、 D区 140， 其中 A区 110与 B区 120相邻连 接， 而 A区 110位于较高水平面而 B区 120位于较低水平面； B区 120与 C 区 130相邻连接而位于同一水平面 （低水平面）； C区 130与 D区 140相邻 连， 而 C区 130位于较低水平面而 D区 140位于较高水平面， 而 D区 140 与 A区 110是在相同的水平面 （高水平面）。 如图所示，为维持导光板 100具备一定程度的强度，B区 120与 A区 110 连接处呈现 A区 110与 B区 120重叠的现象。 在此重叠部份中， 对 B区 120 来说， 除了对应 B区的 LED光条 220之外， 尚会受到对应 A区的 LED光条 210的影响， 因为 LED灯条 210的照明范围应会及于 A区 110的尽头， 亦即 与 B区 120重叠之处。 同样的， 对 A区 110来说， 与 B区 120重叠的部份， 除了对应 A区的 LED灯条 210之外， 亦会受到 B区的 LED灯条 220影响， 因而产生混光的现象。
为了使 B区 120的光源 （即 LED灯条 220 ) 的光线不致进入 A区 110， 并使 A区 110的光源 （即 LED灯条 210 ) 的光线不会进入 B区 120， 于本实 施例中， 在 A区 110的底面以及相对于 LED灯条 210的一端 （亦即重叠部 份的一端） 侧面设置反射层 115与 B区 120隔开。 同理， D区 140的底面与 重叠部的一端的侧面也设有反射层 135。利用反射层 115的设置，使 A区 110 与 B区 120的重叠部份彼此隔开。 同理， 利用反射层 135的设置， 使 C区 130与 D区 140的重叠部份彼此隔开。在 B区 120与 C区 130的邻接结合面 也可利用一反射层 125彼此隔开以防止各自的光源光线互相干扰。 如此， 可 使 A区 110、 B区 120、 C区 130、 D区 140形成一个连续且各区可分别独立 控制的平面光源。
为了加强整个侧光式背光模块的固定与结构安定性， 根据本发明， 液晶 显示器 （未图示） 的背板可以依据此种阶梯状侧光式背光模块的导光板 100 的底部轮廓构成为特殊形状， 配合胶框来实现导光板 100的固定， 如图 6所 示，该图是本发明之侧光式背光模块与液晶显示器的背板配合的立体示意图。 如图所示，液晶显示器的背板 50系形成为阶梯状， 界定出一阶梯状的容置空 间， 恰好可以容置阶梯状的导光板 100与配置于导光板 100各区域 110〜140 侧边之若干 LED灯条 210〜240。
图 7是本发明第三实施例之侧光式背光模块的截面示意图。 于本实施例 中， 背光模块具有一导光板 300， 该导光板 300由四个区域组成： A区 310、 B区 320、 C区 330及 D区 340， 并在各区的侧边设置光源如 LED灯条 410、 420、 430及 440。 其中与上述实施例不同之处在于， 位于中间的两个区域 B 区 320与 C区 330的形状有所改变， 而不是如前面实施例中的单纯平板状。
如图所示， 于本实施例中， B区 320的厚度较厚，左侧边具有一凹槽 324 用于与 A区 320相嵌合， 嵌合之后， A区 310与 B区 320的顶表面是呈现平 坦状，而因为厚度不同， A区 310与 B区 320的底表面呈现阶梯状。 B区 320 的凹槽 324下方的侧边（图中为左侧边）是暴露出来的， B区 320的凹槽 324 下方保留的厚度是足以使得可在 B区 320之左侧边、同时是 A区 310的下方 设置 LED灯条 420， 用于 B区之照明。
同理， C区 320的厚度较 D区 340为厚， 且一侧边 （于图中为右侧边） 具有一凹槽 334用于与 D区 340相嵌合， 嵌合之后， D区 340与 C区 330的 顶表面是呈现平坦状， 而因为厚度不同， D区 340与 C区 330的底表面呈现 阶梯状。 C区 330的凹槽 334下方的侧边 （图中为右侧边） 是暴露出来的， C区 330的凹槽 334下方保留的厚度是足以使得可在 C区 330之右侧边、 同 时是 D区 340的下方设置 LED灯条 430， 用于 C区之照明。 B区 320与 C 区 330厚度相同， 彼此为镜像对称的形状。
此种结构可使导光板 300更坚固， 更易于固定。 应注意的是， 于上述说 明中， 虽然导光板 300是顶表面呈平坦状而底表面呈阶梯状， 但反之亦可。 也就是说， 可以是顶表面呈阶梯状， 而底表面呈平坦状。 此外， 此种结构的 四个导光板区域也可一体成形。 又， 如前面的实施例， 亦可在区域重叠部份 利用反射层来防止混光现象， 方式类同， 在此就不予赘述。
如图所示，本实施例之侧光式背光模块的导光板 300的顶表面为平坦状， 如同一般导光板， 而底表面则呈现阶梯状， 利用阶梯状产生的空间以装设用 于分别照明 B区 320与 C区 330的 LED灯条 420与 430。
应注意的是， 以上虽然以四个区域示范性说明本发明的各个实施例， 但 并不限制于此， 例如说， 本发明之侧光式导光板可由三个区域组成， 或由四 个以上的区域组成。
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. 一种液晶显示器， 具有一液晶面板与一背光模块， 其特征在于： 所述背 光模块包含：
一导光板， 分成若干区域， 所述若干区域构成之导光板呈阶梯状， 使 得各区域具有一侧边暴露出来； 及
若干光源， 各光源是设置于所述导光板的所述若干区域其中之一所暴 露出来的侧边处， 用于照明该区域；
其中所述若干区域构成之导光板的顶表面或底表面呈阶梯状， 而另一 表面呈平坦状， 使得各区域具有一侧边的部份暴露出来； 且于所述导光板 的所述若干区域中两个相邻区域的其中一个在该侧边具有一凹槽， 用于与 另一区域嵌合， 而该侧边的其余部份暴露出来； 该侧边露出来的部份所保 留的厚度界定出一空间以设置该光源； 以及所述液晶显示器尚具有一背板， 该背板构成为阶梯状以容置该导光板以及所述若干光源。
2. 一种用于液晶显示器的侧光式背光模块， 其特征在于： 所述背光模块包 含：
一导光板， 分成若干区域， 所述若干区域构成之导光板呈阶梯状， 使得 各区域具有一侧边暴露出来； 及
若干光源， 各光源是设置于所述导光板的所述若干区域其中之一所暴露 出来的侧边处， 用于照明该区域。
3. 根据权利要求 2所述的侧光式背光模块， 其特征在于： 在所述导光板的 所述若干区域中有两个相邻区域以高低不同的水平面呈阶梯状连接配置。
4. 根据权利要求 3所述的侧光式背光模块， 其特征在于： 在所述导光板的 所述若干区域中有两个相邻区域于同一水平面并排配置。
5. 据权利要求 4所述的侧光式背光模块， 其特征在于： 所述导光板尚包含 一反射层用于将该并排配置的两个相邻区域的邻接结合面彼此隔开。
6. 根据权利要求 3所述的侧光式背光模块， 其特征在于： 以高低不同水平 面呈阶梯状连接配置的所述两个相邻区域具有重叠部份，所述导光板尚包 含一反射层在所述重叠部份将所述两个相邻区域彼此隔开。
7. 根据权利要求 2所述的侧光式背光模块， 其特征在于： 所述若干区域构 成之导光板的顶表面或底表面呈阶梯状，而另一表面呈平坦状，使得各区 域具有一侧边的部份暴露出来。
8. 根据权利要求 7所述的侧光式背光模块， 其特征在于： 于所述导光板的 所述若干区域中两个相邻区域的其中一个在该侧边具有一凹槽，用于与另 一区域嵌合， 而该侧边的其余部份暴露出来。
9. 根据权利要求 8所述的侧光式背光模块， 其特征在于： 该侧边露出来的 部份所保留的厚度界定出一空间以设置该光源。
10.—种液晶显示器， 具有一液晶面板与一背光模块， 其特征在于： 所述背 光模块包含：
一导光板， 分成若干区域， 所述若干区域构成之导光板呈阶梯状， 使得 各区域具有一侧边暴露出来； 及 若干光源， 各光源是设置于所述导光板的所述若干区域其中之一所暴露 出来的侧边处， 用于照明该区域。
11.根据权利要求 10所述的液晶显示器，其特征在于：在所述导光板的所述 若干区域中有两个相邻区域以高低不同的水平面呈阶梯状连接配置。
12.根据权利要求 11所述的液晶显示器， 其特征在于：在所述导光板的所述 若干区域中有两个相邻区域于同一水平面并排配置。
13.根据权利要求 12所述的液晶显示器，其特征在于：所述导光板尚包含一 反射层用于将该并排配置的两个相邻区域的邻接结合面彼此隔开。
14.根据权利要求 11所述的液晶显示器， 其特征在于： 以高低不同水平面呈 阶梯状连接配置的所述两个相邻区域具有重叠部份，所述导光板尚包含一 反射层在所述重叠部份将所述两个相邻区域彼此隔开。
15.根据权利要求 10所述的液晶显示器，其特征在于：所述若干区域构成之 导光板的顶表面或底表面呈阶梯状，而另一表面呈平坦状，使得各区域具 有一侧边的部份暴露出来。
16.根据权利要求 13所述的液晶显示器，其特征在于： 于所述导光板的所述 若干区域中两个相邻区域的其中一个在该侧边具有一凹槽，用于与另一区 域嵌合， 而该侧边的其余部份暴露出来。
17.根据权利要求 16所述的液晶显示器，其特征在于： 该侧边露出来的部份 所保留的厚度界定出一空间以设置该光源。
18.根据权利要求 10所述的液晶显示器，其特征在于：所述液晶显示器尚具 有一背板， 该背板构成为阶梯状以容置该导光板以及所述若干光源
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