WO2012012992A1 - 多层导光板及液晶显示模块 - Google Patents

多层导光板及液晶显示模块 Download PDF

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Publication number
WO2012012992A1
WO2012012992A1 PCT/CN2010/079150 CN2010079150W WO2012012992A1 WO 2012012992 A1 WO2012012992 A1 WO 2012012992A1 CN 2010079150 W CN2010079150 W CN 2010079150W WO 2012012992 A1 WO2012012992 A1 WO 2012012992A1
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WO
WIPO (PCT)
Prior art keywords
light guide
liquid crystal
region
guide plate
regions
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PCT/CN2010/079150
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English (en)
French (fr)
Inventor
任杰
郭仪正
方扩军
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深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/220,281 priority Critical patent/US8593587B2/en
Publication of WO2012012992A1 publication Critical patent/WO2012012992A1/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
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
    • 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]

Definitions

  • the invention relates to a multi-layer light guide plate and a liquid crystal display module, in particular to a liquid crystal display module which utilizes a novel structure design on a multi-layer light guide plate to effectively improve the regional brightness control effect, and belongs to the field of liquid crystal technology. .
  • a liquid crystal is a substance between a liquid and a crystal. Its display principle is to change the molecular alignment state by applying different voltages to the liquid crystal, thereby controlling the throughput of light to display a wide variety of images. .
  • the liquid crystal itself does not emit light, it just controls the passage of light, so all liquid crystal display modules (LCD) Modules all require a backlight to provide illumination.
  • the backlight used in the liquid crystal display module was mainly CCFL (Cold Cathode Fluorescent Lamp).
  • CCFL Cold Cathode Fluorescent Lamp
  • LEDs light-emitting diodes
  • LED as a backlight can greatly reduce power consumption, improve display screen contrast, grayscale, and reduce afterimage, the technical advantage is very obvious.
  • Area brightness control is a technology that enables the backlight of the liquid crystal display module to achieve different degrees of brightness and brightness changes in different regions. It can be roughly divided into 3 categories, each of which is 0-dimensional (0 D), 1-dimensional (1D) and 2-dimensional (2D) brightness control, the corresponding backlights are planar light source (FFL and OLED), CCFL (or EEFL similar to CCFL) and LED.
  • LEDs are the best source of light in current backlights that can be used to control area brightness. This is because the light source of the planar light source is not lit by the whole piece, or the whole piece is darkened, and the backlight cannot be made into a block and different brightness changes; CCFL or EEFL is a linear light source, and the dot-off speed is not fast enough, if forcedly driven The speed of the switch will detract from the life of the CCFL.
  • the direct-lit LED backlights are mostly arranged in a matrix, for example, a certain 46-inch LCD TV uses about 1500 white LEDs. In theory, each LED can be regarded as a small unit controlled by a region. It is very beneficial to achieve regional brightness control technology.
  • a main object of the present invention is to provide a liquid crystal display module that realizes area brightness control.
  • the liquid crystal display module utilizes a multi-layer light guide plate of a novel structure, thereby effectively improving the dual effects of area brightness control and sub-area brightness control.
  • a secondary object of the present invention is to provide a liquid crystal display module that realizes area brightness control.
  • the liquid crystal display module forms a light mixing region by using overlapping portions of the plurality of light guide plates, and can provide a pre-uniform light mixing effect to the lower layer light guide plate.
  • Another object of the present invention is to provide a multilayer light guide plate which can be used in the above liquid crystal display module to realize area brightness control.
  • a multi-layer light guide plate for realizing area brightness control in a liquid crystal display module wherein the multi-layer light guide plate is divided into a plurality of regions sequentially connected in one direction, and in each of the plurality of regions An outer side surface is provided with at least one light bar; wherein a region opposite to an intermediate position of the multi-layer light guide plate and a light bar thereof are on a relatively lower same layer, and are located opposite to the outer side of the multilayer light guide plate The area and its light bar are on a relatively high level.
  • each of the two adjacent regions has a reflective sheet or a reflective coating therebetween.
  • a portion of the adjacent regions between the two different layers overlap each other such that the relatively lower region defines a light mixing region at the overlapping portion.
  • the region located at the intermediate position and the region located at the outer position have the same thickness.
  • the region relatively at the intermediate position has a relatively large thickness
  • the region at the outer position has a relatively small thickness
  • the region opposite the intermediate position has a shoulder to carry and bond the region that is relatively opposite the outer location.
  • the region opposite the intermediate position and the region opposite the outer location have a reflective sheet or reflective coating at the shoulder.
  • a plurality of grooves are arranged side by side on a lower surface of any one of the plurality of regions, such that the region is further divided to form a plurality of sub-regions; wherein the groove extends in a direction
  • the light bar in this area is set in a vertical direction.
  • a reflective sheet or a reflective coating is provided on the inner wall surface of the recess.
  • each of the light bars comprises a plurality of LEDs.
  • a liquid crystal display module comprising a liquid crystal panel and a back plate, further comprising a plurality of light guide plates between the liquid crystal panel and the back plate; and the multilayer light guide plate is divided into one direction a plurality of regions connected in series, and at least one light bar is disposed on an outer side of each of the plurality of regions; wherein a region opposite to an intermediate position of the multilayer light guide plate and a light bar thereof On the relatively lower same layer, the area opposite the outer position of the multilayer light guide plate and its light bar are on a relatively higher layer.
  • the back plate is a stepped back plate that is matched with the lower surface of the multilayer light guide plate to carry a plurality of positions at the middle and outer positions of the multilayer light guide plate. region.
  • the multi-layer light guide plate provided by the invention realizes the regional brightness control of multiple regions by the novel and clever structural design scheme and the light-injecting characteristics of the side LEDs, and can ensure that the light between the respective regions does not affect each other.
  • the use of the multi-layer light guide plate in the liquid crystal display module can effectively improve the picture quality of the liquid crystal display, reduce the overall power consumption of the display device, and is also easier to implement in structural assembly.
  • the multi-layer light guide plate provided by the invention realizes the area brightness control of multiple regions or the sub-area brightness control of the same area by the novel and clever structural design scheme, and the light-introduction characteristics of the side LEDs, and has dual area brightness control. The effect is that the light between the various areas does not affect each other.
  • the use of the multi-layer light guide plate in the liquid crystal display module can effectively improve the picture quality of the liquid crystal display, reduce the overall power consumption of the display device, and is also easier to implement in structural assembly.
  • FIG. 1 is a schematic perspective view of a multilayer light guide plate provided by the present invention.
  • FIG. 2 is a schematic cross-sectional view of the multilayer light guide plate shown in FIG. 1;
  • FIG. 3 is a schematic view of two light mixing regions in a multilayer light guide plate
  • FIG. 4 is a schematic cross-sectional view of a region A along the line I-I in the multilayer light guide of FIG. 1;
  • FIG. 5 is a schematic view showing an assembled state of a stepped back plate and a multilayer light guide plate
  • FIG. 6 is a schematic cross-sectional view showing another embodiment of a multilayer light guide plate.
  • the core technical concept of the invention is to use the improved design of the multi-layer light guide plate, and to realize the brightness control of the independent areas of the plurality of areas in accordance with the light-input characteristics of the side LEDs, and to ensure that the light between the respective areas does not affect each other, Thereby effectively improving the picture quality of the liquid crystal display.
  • the liquid crystal display module can be said to be a combination of a liquid crystal panel and a backlight assembly.
  • a typical liquid crystal display module it mainly includes the following components: a back plate, a reflective sheet, a backlight assembly, a light guide plate (also called an optical film), a liquid crystal panel, and a front frame.
  • the back sheet, the reflective sheet, the backlight assembly, the light guide plate, the liquid crystal panel and the front frame are assembled to form a unitary body.
  • the light guide plate is located between the back plate and the liquid crystal panel, and has a significant and direct influence on the picture quality of the liquid crystal display.
  • the light guide plate in the existing liquid crystal display module is usually a single layer, and the light guide plate provided in the present invention has a double layer or a multilayer structure in order to realize distributed light guide of a plurality of regions.
  • the structural improvement of the multilayer light guide plate will be described in detail.
  • A, B, C, and D are sequentially connected and symmetrically arranged in one direction in which the plurality of light guide plates are divided.
  • the zone and zone D are on a relatively high level.
  • the lower light guide plate has a light-mixing region formed by partially overlapping the light guide plates between adjacent regions located in different layers.
  • a portion of the light guide plate connected to the A region and the B region overlaps one another so that B A mixed light region B1 is formed in the region, and a portion of the light guide plate connecting the C region and the D region also overlaps the upper portion to form a light mixing region C1.
  • the function of the light mixing region will be further described below. It should be noted that in the embodiment shown in FIG. 1, A, B, C, and D The four areas are symmetrically set. However, in other embodiments, the four regions may also adopt an asymmetric arrangement, that is, the number of regions of the upper and lower light guide plates on the two sides may be different.
  • the light bar 11 controls the light emission of the A area
  • the light bar 12 controls the light emission of the B area
  • the light bar 13 controls the light emission of the C area
  • the light bar 14 controls the light emission of the D area.
  • These light bars 11 to 14 are used as a backlight and are formed by connecting a plurality of LEDs in series.
  • the B zone and the C zone relative to the intermediate position of the multilayer light guide plate and the light bars 12, 13 thereof are on the relatively lower same layer, and are respectively located on both sides (outer side) of the multilayer light guide plate.
  • the A and D zones of the location and their light bars 11, 14 are on a relatively high level.
  • the use of an LED as a backlight of a liquid crystal display module and constituting a light bar is a conventional technical solution that can be grasped by those skilled in the art, and will not be described in detail herein.
  • Figure 2 is a cross-sectional view of the multilayer light guide plate shown in Figure 1.
  • the light bar 11 is located on the left outer side of the light guide plate of the A area
  • the light bar 12 is located on the left outer side of the light guide plate of the B area
  • the light bar 13 is located.
  • the right outer side of the light guide plate of zone C, the light bar 14 is located on the right outer side of the light guide plate of zone D.
  • the entire multilayer light guide plate (including the light strip that realizes the side entrance light) is preferably of a symmetrical structure.
  • the lower surface of the D zone and the inner surface without the light bar are also separated by a reflective sheet or a reflective coating, and the bonding faces of the B and C regions are also separated by a reflective sheet or a reflective coating.
  • the lower surface of the B zone and the C zone may be provided with a reflective sheet or a reflective coating, or may be provided without a reflective sheet or a reflective coating. In this way, the light of the light bar 12 can be sufficiently reflected to the outside of the B-region light guide plate after being sufficiently reflected to a pre-uniformity in the light-mixing region B1.
  • the light of the light bar 13 can be sufficiently reflected out of the upper surface of the C-zone light guide plate after being sufficiently reflected to a pre-uniformity in the light-mixing region C1. Therefore, the light mixing regions B1 and C1 have an effect of uniformly mixing light in advance.
  • the uniformity of brightness and/or the zoning controllability of the A region is improved, and the A region is ensured to be an integral light guide plate, and further
  • the A region of the multilayer light guide plate may be formed into a cross-sectional shape as shown in FIG. 4, that is, a parallel groove A0 is opened at a certain distance on the lower surface of the A region, thereby further dividing the A region into a plurality of sub-regions.
  • the side entrance light surface of the A1 sub-area corresponds to a part of the LEDs connected in series by the light bar 11, so that the brightness of the A1 area can be individually controlled;
  • the side entrance light of the A2 sub-area The face corresponds to the other part of the LEDs connected in series by the light bar 11, so that the brightness of the A2 area can be individually controlled.
  • the rest of the sub-areas are analogous.
  • illumination of each of the sub-areas A1, A2, A3, ... AN is further individually controlled by the N sets of LEDs connected in series in the light bar 11.
  • a reflection sheet may be attached to at least the inner wall surface of the groove A0 (ie, the chamfer structure) at the boundary between the A1 sub-region and the A2 sub-region.
  • a reflection sheet may be attached to the inner wall surface of the groove A0 (i.e., the chamfer structure) at the boundary between the A2 sub-area and the A3 sub-area to prevent the light of the A2 sub-area from entering the A1 or A3 sub-area.
  • the above structural design scheme is also applicable to the design of the B region in the multilayer light guide plate, so that the B1 sub-region to the BN (N is a natural number) sub-regions are independent of each other and do not affect each other.
  • a similar design can also be analogized to the design of the light guide plate structure of the C zone and the D zone, wherein the extending direction of the groove is substantially perpendicular to the direction in which the light bars of the respective zones are arranged, that is, parallel to the light emitted by the light bars of the respective zones.
  • the inner wall surface of the groove i.e., the chamfered structure
  • the boundary of the sub-area should be attached with a reflection sheet, which will not be described in detail. In this way, a liquid crystal backlight module that enters light from the side and independently performs regional brightness control and sub-area brightness control in each area is realized.
  • the light guide plate In the manufacturing process of the liquid crystal display module, the light guide plate is usually made into a flat surface, which is convenient for assembly operation.
  • the four regions A to D are not on one plane, thus bringing certain difficulties to the assembly operation.
  • a stepped back plate 20 can also be fabricated.
  • the stepped back plate 20 can be matched with a plastic frame (not shown) having a corresponding assembled shape.
  • the shape of the stepped back plate 20 and the outer shape of the multilayer light guide plate of the present invention are compatible with each other, it is easy to achieve mounting and fixing of the four regions A to D of the multilayer light guide plate.
  • Another solution of the invention is to directly change the shape of the multilayer light guide.
  • the thicknesses of the B and C regions of the inner light guide plate can be directly increased so that their upper surfaces are on the same plane as the upper surfaces of the A and D regions and are flush with each other, thereby making the multilayer light guide plate
  • the shape changes from a general U shape to a general T shape.
  • the B and C regions of the inner light guide plate are respectively recessed on the outer side of the upper portion to form a shoulder portion B2, C2, which can respectively carry the right inner end and the D portion of the outer light guide plate A region. The left inner end.
  • the A region and the B region also have an upper and lower overlapping region (ie, the light guide plate below the shoulder portion B2). Part)) This area is the light mixing area B1 of the light guide plate of the B area.
  • the C area and the D area i.e., the portion of the light guide plate below the shoulder C2
  • the lower surface of the A zone and the inner side surface of the light bar or the surface of the shoulder B2 are coated with a reflection sheet or a reflection.
  • the layers are isolated.
  • the lower surface of the D zone and the inner surface of the light bar, or the surface of the shoulder C2 are also separated by a reflective sheet or a reflective coating, and the bonding surfaces of the B and C regions are also reflected.
  • the sheet or reflective coating is isolated.
  • the lower surface of the B zone and the C zone may be provided with a reflective sheet or a reflective coating, or may be provided without a reflective sheet or a reflective coating.
  • the light mixing regions B1 and C1 shown in FIG. 6 have the same pre-uniform light mixing effect as the light mixing regions B1 and C1 of FIGS. 1 to 3.
  • the multi-layer light guide plate provided by the present invention realizes the area brightness control of multiple areas or the sub-area brightness control of the same area by the novel and clever structural design scheme and the light-input characteristics of the side LEDs. Dual area brightness control, and can ensure that the light between the various areas does not affect each other.
  • the use of the multi-layer light guide plate in the liquid crystal display module can effectively improve the picture quality of the liquid crystal display, reduce the overall power consumption of the display device, and is also easier to implement in structural assembly.

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

Description

多层导光板及液晶显示模块 技术领域
本发明涉及一种多层导光板及液晶显示模块，尤其涉及一种利用多层导光板上的新型结构设计，有效改善区域亮度控制效果的液晶显示模块，属于液晶技术领域。。
背景技术
液晶（LCD）是一种介乎于液体和晶体之间的物质，其显示原理是通过给液晶施加不同的电压来改变其分子排列状态，从而控制光线的通过量，以便显示多种多样的图像。而液晶自身并不会发光，它只是控制光线的通过与否，因此所有的液晶显示模块（LCD Module）都需要背光源来提供照明。
早先，液晶显示模块中使用的背光源以CCFL（冷阴极荧光灯管）为主。随着液晶技术的发展，在液晶显示模块中开始广泛使用LED（发光二极管）作为背光源。以LED作为背光源可以大幅降低耗电量，提高显示画面对比度、灰阶数，并且减少残影，技术优势十分明显。
区域亮度控制（local dimming）是使液晶显示模块的背光源实现不同区域、不同程度辉度明暗变化的技术。它大致可以分为3类，分别为0次元（0 D）、1次元（1D）和2次元（2D）亮度控制，其所对应的背光源分别为平面光源（FFL及OLED）、CCFL（或与CCFL相似的EEFL）及LED。
LED是目前的背光源中能将区域亮度控制发挥到最好的光源。这是因为平面光源发光方式不是整片点亮，就是整片变暗，其背光无法作到小区块、且不同辉度变化；CCFL或EEFL为直线光源，且点灭速度不够快，若强行驱动其开关的速度，会减损CCFL的寿命。而直下式排列的LED背光源，因使用颗数多（例如某款46英寸液晶电视使用约1500颗白光LED），且呈矩阵式排列，理论上每颗LED可视为一个区域控制的小单位，非常有利于实现区域亮度控制技术。
但是，目前针对直下式排列的LED背光源的区域亮度控制仍然存在一定的不足。其主要原因是所述LED背光源是将LED阵列排布在LCD玻璃的正下方以提供光源给LCD玻璃，实现各个区域的调光。但是此种方式需要的LED数量多、功耗大、且厚度比较厚。后续发展出的LED侧入光技术也存在实现区域亮度控制的区域比较少，只能通过两个灯条实现较少区域的调光，而且区域之间的光会互相影响的问题，在一定程度上影响液晶显示的画质。
故，有必要提供一种改进区域亮度控制效果的液晶显示模块，以解决现有技术所存在的问题。
 技术问题
本发明的主要目的在于提供一种实现区域亮度控制的液晶显示模块。所述液晶显示模块利用新型结构的多层导光板，有效改善了区域亮度控制及子区域亮度控制的双重效果。
本发明的次要目的在于提供一种实现区域亮度控制的液晶显示模块。所述液晶显示模块利用多层导光板之重叠部分形成混光区，可对下层导光板提供预先均匀混光的效果。
本发明的另一目的在于提供一种用在上述液晶显示模块中，可实现区域亮度控制的多层导光板。
 技术解决方案
为实现以上的发明目的，本发明揭示的技术方案如下：
一种多层导光板，用于在液晶显示模块中实现区域亮度控制，其中所述多层导光板分成一个方向上顺序相连的多个区域，并且在所述多个区域中的每一个区域的一个外侧面设置有至少一灯条；其中相对位于所述多层导光板的中间位置的区域及其灯条处在相对较低的同一层上，而相对位于所述多层导光板的外侧位置的区域及其灯条是处在相对较高的另一层上。
在本发明的一实施例中，各二相邻所述区域之间具有反射片或反射涂层。
在本发明的一实施例中，位于不同层之二相邻所述区域之间具有一部分相互重叠，使得所述相对较低的区域在此重叠部分定义形成一混光区。
在本发明的一实施例中，相对位于所述中间位置的区域及相对位于所述外侧位置的区域具有相同的厚度。
在本发明的一实施例中，相对位于所述中间位置的区域具有相对较大厚度，及相对位于所述外侧位置的区域具有相对较小厚度。
在本发明的一实施例中，相对位于所述中间位置的区域具有一肩部，以承载及结合相对位于所述外侧位置的区域。
在本发明的一实施例中，相对位于所述中间位置的区域及相对位于所述外侧位置的区域在所述肩部处具有反射片或反射涂层。
在本发明的一实施例中，在所述多个区域中的任一个区域的下表面上并排有数个凹槽，以使此区域进一步划分形成多个子区域；其中所述凹槽的延伸方向与此区域的灯条的设置方向垂直。
在本发明的一实施例中，在所述凹槽的内壁面具有反射片或反射涂层。
在本发明的一实施例中，每一所述灯条包含多颗LED。
一种液晶显示模块，包括液晶面板和背板，此外所述液晶显示模块中还具有位于所述液晶面板与所述背板之间的多层导光板；以及所述多层导光板分成一个方向上顺序相连的多个区域，并且在所述多个区域中的每一个区域的一个外侧面设置有至少一灯条；其中相对位于所述多层导光板的中间位置的区域及其灯条处在相对较低的同一层上，而相对位于所述多层导光板的外侧位置的区域及其灯条是处在相对较高的另一层上。
在本发明的一实施例中，所述背板为与所述多层导光板的下表面相契合的一阶梯状背板，以承载位于所述多层导光板的中间及外侧位置的多个区域。
本发明所提供的多层导光板通过新颖巧妙的结构设计方案，配合侧边LED的入光特点实现了多个区域的区域亮度控制，而且可以保证各个区域之间的光线不互相影响。在液晶显示模块中采用本多层导光板，可以有效提升液晶显示的画面质量，降低显示装置的整体功耗，而且在结构装配上也更容易实现。
 有益效果
本发明所提供的多层导光板通过新颖巧妙的结构设计方案，配合侧边LED的入光特点实现了多个区域的区域亮度控制或同一个区域的子区域亮度控制，而有双重区域亮度控制效果，而且可以保证各个区域之间的光线不互相影响。在液晶显示模块中采用本多层导光板，可以有效提升液晶显示的画面质量，降低显示装置的整体功耗，而且在结构装配上也更容易实现。
 附图说明
图1为本发明所提供的多层导光板的立体结构示意图；
图2为图1所示的多层导光板的一个剖面示意图；
图3为多层导光板中，两个混光区的示意图；
图4为图1的多层导光板中，沿I-I线所作的A区域的截面形状示意图；
图5为阶梯状背板与多层导光板的组装状态示意图；
图6为多层导光板的另一实施例的剖面示意图。
 本发明的最佳实施方式
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。
本发明的核心技术理念是利用多层导光板在结构上的改进设计，配合侧边LED的入光特点来实现多个区域的独立区域亮度控制，并且保证各个区域之间的光线不互相影响，从而有效提升液晶显示的画面质量。
液晶显示模块可以说是液晶面板与背光组件的组合体。对于一款典型的液晶显示模块而言，主要包括以下的组成部分：背板、反射片、背光组件、导光板（也称光学膜片）、液晶面板（panel）和前框。在制造液晶显示模块的过程中，所述背板、反射片、背光组件、导光板、液晶面板（panel）和前框被组装在一起，形成一个整体。其中，所述导光板位于背板与液晶面板之间，对液晶显示的画面质量具有重大而直接的影响。
现有液晶显示模块中的导光板通常为单层，而在本发明中提供的导光板为双层或多层结构，以便实现多区域的分布式导光。下面，对所述多层导光板在结构上的改进之处进行详细的说明。
如图1所示，本发明中把多层导光板分成的一个方向上顺序相连并且对称设置的A、B、C、D 四个区域。在这四个区域中，位于所述多层导光板的中间位置的B区和C区处在相对较低的同一层上，而分别位于所述多层导光板的两侧(外侧)的A区和D区则处在相对较高的另一层上。并且，下层导光板在位于不同层的相邻区域之间具有因导光板相互部分重叠而形成的混光区，具体而言，导光板的A区与B区相连接的一部分上下重叠而使B区形成一混光区B1，同时导光板的C区与D区相连接的一部分也上下重叠而使C区形成一混光区C1，所述混光区的作用将于下文另作说明。需要说明的是，在图1所示的实施例中，A、B、C、D 四个区域是对称设置的。但在其它的实施例中，这四个区域也可以采用不对称的设置方式，也就是两侧的上下层导光板各区域的数量可以不相同。
在本液晶显示模块中，使用了四条灯条11、12、13及14来实现发光控制。其中，灯条11控制A区的发光，灯条12控制B区的发光，灯条13控制C区的发光，灯条14控制D区的发光。这些灯条11至14作为背光源，由多颗LED串联而成。相对位于所述多层导光板的中间位置的B区和C区及其灯条12、13处在相对较低的同一层上，而相对分别位于所述多层导光板的两侧(外侧)位置的A区和D区及其灯条11、14则处在相对较高的另一层上。以LED作为液晶显示模块的背光源并构成灯条是本领域普通技术人员都能掌握的常规技术方案，在此就不详细赘述了。
图2是图1所示的多层导光板的一个剖面图。在图2所示的实施例中，由于采用LED侧入光的方式，因此灯条11位于A区导光板的左外侧面，灯条12位于B区导光板的左外侧面，灯条13位于C区导光板的右外侧面，灯条14位于D区导光板的右外侧面。整个多层导光板（包括实现侧入光的灯条）优选为对称结构。
如图3所示，为了使导光板的A区和B区形成一个连续且可以分别独立控制的平面光源，A区和B区之间有一个上下重叠的区域，此区域是B区导光板的混光区B1。类似地，C区和D区之间也有一个上下重叠的区域，此区域是C区导光板的混光区C1。在混光区中，为了保证灯条12的光线不进入到A区，将A区的下表面和没有设置灯条的内侧表面都用反射片或反射涂层隔离开来。依次类推，D区的下表面和没有设置灯条的内侧表面也用反射片或反射涂层隔离开来，而B区和C区的结合面也用反射片或反射涂层隔离开来。B区和C区的下表面可以设置反射片或反射涂层，也可以不设置反射片或反射涂层。如此，灯条12的光线可先在在所述混光区B1内充分反射至一预均匀的程度后，再未由所述B区导光板的上表面向外射出。同样的，灯条13的光线可先在在所述混光区C1内充分反射至一预均匀的程度后，再未由所述C区导光板的上表面向外射出。因此，所述混光区B1及C1具有预先均匀混光的效果。
更进一步的，为了使多层导光板中的同一A区内部之间的光不互相影响，提高A区亮度的均匀度及/或分区控制性，并且保证A区是一个整体的导光板，进一步可以将多层导光板中的A区制作成如图4所示的截面形状，即在A区的下表面上每隔一定的距离开设平行的凹槽A0，从而将A区进一步划分为多个子区域A1、A2、A3……AN（N为自然数），其中凹槽A0的延伸方向大致是与灯条11的设置方向垂直，也就是与灯条11发出的光线平行。如图4所示，A1子区域的侧入光面（即左外侧面）对应的是灯条11所串联的LED中的一部分，故可以单独控制A1区域的亮度；A2子区域的侧入光面对应的是灯条11所串联的LED中的另外一部分，故可以单独控制A2区域的亮度。其余的子区域依次类推。这样，通过灯条11中串联的N组LED来分别实现进一步单独控制每一子区域A1、A2、A3……AN的照明。
为了防止A1子区域的光线进入A2子区域，可以至少在A1子区域和A2子区域交界的凹槽A0（即切角结构）的内壁面贴上反射片。类似地，可以在A2子区域和A3子区域交界的凹槽A0（即切角结构）的内壁面贴上反射片，以防止A2子区域的光线进入A1或A3子区域。通过这样的结构设计，可以使A1子区域到AN子区域之间实现相互独立、互不影响。
上述的结构设计方案同样也适用于多层导光板中B区的设计，从而使B1子区域到BN（N为自然数）子区域之间实现相互独立、互不影响。类似的设计方案还可以依次类推到C区和D区的导光板结构设计上，其中凹槽的延伸方向大致是与各区的灯条的设置方向垂直，也就是与各区的灯条发出的光线平行，同时优选仍应在子区域交界的凹槽（即切角结构）的内壁面贴上反射片，在此就不详细说明了。这样就实现了从侧边入光且各个区域独立进行区域亮度控制及子区域亮度控制双重效果的液晶背光模块。
在液晶显示模块的制造过程中，导光板通常是做成一个平面的，这样便于组装操作。但对于本发明所提供的多层导光板而言，4个区域A至D并不是处在一个平面上，因此给组装操作带来了一定的困难。为了解决这一问题，如图1及5所示，也可以制作一个阶梯状背板20。所述阶梯状背板20可搭配具对应组装形状的胶框(未绘示)。这样，由于阶梯状背板20的形状与本发明多层导光板的外形相互契合，因此很容易实现对多层导光板4个区域A至D的安装固定。
本发明另外一种解决方案是直接改变多层导光板的形状。如图6所示，可以直接增加内侧导光板B区和C区的厚度，使它们的上表面与A区和D区的上表面位于同一个平面上并且相互平齐，从而使多层导光板的形状由概呈U字形变为概呈T字形。同时，内侧导光板中B区和C区分别在其上部外侧凹设形成一肩部B2、C2，所述肩部B2、C2可分别用以承载外侧导光板A区的右内端和D区的左内端。
再者，为了使导光板的A区和B区形成一个连续且可以分别独立控制的平面光源，A区和B区之间也具有一个上下重叠的区域(即所述肩部B2下方的导光板部分)，此区域即是B区导光板的混光区B1。类似地，C区和D区之间也有一个上下重叠的区域(即所述肩部C2下方的导光板部分)，此区域即是C区导光板的混光区C1。在混光区中，为了保证灯条12的光线不进入到A区，将A区的下表面和没有设置灯条的内侧表面，或所述肩部B2的表面，都用反射片或反射涂层隔离开来。依次类推，D区的下表面和没有设置灯条的内侧表面，或所述肩部C2的表面，也用反射片或反射涂层隔离开来，而B区和C区的结合面也用反射片或反射涂层隔离开来。B区和C区的下表面可以设置反射片或反射涂层，也可以不设置反射片或反射涂层。如图6所示的混光区B1及C1则具备与图1至3的混光区B1及C1的相同预先均匀混光效果。
如图6所示的这种形状上的改变可以使多层导光板更加容易被固定。需要说明的是，在图6所示的技术方案中，多层导光板的A、B、C、D 四个区域仍然可以采用如图4所示的结构设计方案以便实现各个区域的单独出光和控制。
如上所述，本发明所提供的多层导光板通过新颖巧妙的结构设计方案，配合侧边LED的入光特点实现了多个区域的区域亮度控制或同一个区域的子区域亮度控制，而有双重区域亮度控制效果，而且可以保证各个区域之间的光线不互相影响。在液晶显示模块中采用本多层导光板，可以有效提升液晶显示的画面质量，降低显示装置的整体功耗，而且在结构装配上也更容易实现。
本发明已由上述相关实施例加以描述，然而上述实施例仅为实施本发明的范例。必需指出的是，已公开的实施例并未限制本发明的范围。相反地，包含于权利要求书的精神及范围的修改及均等设置均包括于本发明的范围内。
 本发明的实施方式
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Claims (20)

  1. 一种液晶显示模块，包括液晶面板和背板，其特征在于：
    所述液晶显示模块中具有位于所述液晶面板与所述背板之间的多层导光板；以及
    所述多层导光板分成一个方向上顺序相连的多个区域，并且在所述多个区域中的每一个区域的一个外侧面设置有至少一灯条；
    其中相对位于所述多层导光板的中间位置的区域及其灯条处在相对较低的同一层上，而相对位于所述多层导光板的外侧位置的区域及其灯条是处在相对较高的另一层上；以及
    其中所述背板为与所述多层导光板的下表面相契合的一阶梯状背板，以承载位于所述多层导光板的中间及外侧位置的多个区域；各二相邻所述区域之间具有反射片或反射涂层；位于不同层之二相邻所述区域之间具有一部分相互重叠，使得所述相对较低的区域在此重叠部分定义形成一混光区。
  2. 一种液晶显示模块，包括液晶面板和背板，其特征在于：
    所述液晶显示模块中还具有位于所述液晶面板与所述背板之间的多层导光板；以及
    所述多层导光板分成一个方向上顺序相连的多个区域，并且在所述多个区域中的每一个区域的一个外侧面设置有至少一灯条；
    其中相对位于所述多层导光板的中间位置的区域及其灯条处在相对较低的同一层上，而相对位于所述多层导光板的外侧位置的区域及其灯条是处在相对较高的另一层上。
  3. 如权利要求2所述的液晶显示模块，其特征在于：所述背板为与所述多层导光板的下表面相契合的一阶梯状背板，以承载位于所述多层导光板的中间及外侧位置的多个区域。
  4. 如权利要求2所述的液晶显示模块，其特征在于：各二相邻所述区域之间具有反射片或反射涂层。
  5. 如权利要求2所述的液晶显示模块，其特征在于：位于不同层之二相邻所述区域之间具有一部分相互重叠，使得所述相对较低的区域在此重叠部分定义形成一混光区。
  6. 如权利要求2所述的液晶显示模块，其特征在于：相对位于所述中间位置的区域及相对位于所述外侧位置的区域具有相同的厚度。
  7. 如权利要求2所述的液晶显示模块，其特征在于：相对位于所述中间位置的区域具有相对较大厚度，及相对位于所述外侧位置的区域具有相对较小厚度。
  8. 如权利要求7所述的液晶显示模块，其特征在于：相对位于所述中间位置的区域具有一肩部，以承载及结合相对位于所述外侧位置的区域。
  9. 如权利要求8所述的液晶显示模块，其特征在于：相对位于所述中间位置的区域及相对位于所述外侧位置的区域在所述肩部处具有反射片或反射涂层。
  10. 如权利要求2所述的液晶显示模块，其特征在于：在所述多个区域中的任一个区域的下表面上并排有数个凹槽，以使此区域进一步划分形成多个子区域；其中所述凹槽的延伸方向与此区域的灯条的设置方向垂直。
  11. 如权利要求10所述的液晶显示模块，其特征在于：在所述凹槽的内壁面具有反射片或反射涂层。
  12. 一种多层导光板，用于在液晶显示模块中实现区域亮度控制，其特征在于：
    所述多层导光板分成一个方向上顺序相连的多个区域，并且在所述多个区域中的每一个区域的一个外侧面设置有至少一灯条；
    其中相对位于所述多层导光板的中间位置的区域及其灯条处在相对较低的同一层上，而相对位于所述多层导光板的外侧位置的区域及其灯条是处在相对较高的另一层上。
  13. 如权利要求12所述的多层导光板，其特征在于：各二相邻所述区域之间具有反射片或反射涂层。
  14. 如权利要求12所述的多层导光板，其特征在于：位于不同层之二相邻所述区域之间具有一部分相互重叠，使得所述相对较低的区域在此重叠部分定义形成一混光区。
  15. 如权利要求12所述的多层导光板，其特征在于：相对位于所述中间位置的区域及相对位于所述外侧位置的区域具有相同的厚度。
  16. 如权利要求12所述的多层导光板，其特征在于：相对位于所述中间位置的区域具有相对较大厚度，及相对位于所述外侧位置的区域具有相对较小厚度。
  17. 如权利要求16所述的多层导光板，其特征在于：相对位于所述中间位置的区域具有一肩部，以承载及结合相对位于所述外侧位置的区域。
  18. 如权利要求17所述的多层导光板，其特征在于：相对位于所述中间位置的区域及相对位于所述外侧位置的区域在所述肩部处具有反射片或反射涂层。
  19. 如权利要求12所述的多层导光板，其特征在于：在所述多个区域中的任一个区域的下表面上并排有数个凹槽，以使此区域进一步划分形成多个子区域；其中所述凹槽的延伸方向与此区域的灯条的设置方向垂直。
  20. 如权利要求12所述的多层导光板，其特征在于：每一所述灯条包含多颗LED。
PCT/CN2010/079150 2010-07-28 2010-11-26 多层导光板及液晶显示模块 WO2012012992A1 (zh)

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