WO2018126701A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2018126701A1
WO2018126701A1 PCT/CN2017/098279 CN2017098279W WO2018126701A1 WO 2018126701 A1 WO2018126701 A1 WO 2018126701A1 CN 2017098279 W CN2017098279 W CN 2017098279W WO 2018126701 A1 WO2018126701 A1 WO 2018126701A1
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WIPO (PCT)
Prior art keywords
light guide
backlight module
guide plates
light
display device
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PCT/CN2017/098279
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English (en)
French (fr)
Inventor
吕金库
浩育涛
陈英
李健
李冬磊
王伯长
布占场
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/763,831 priority Critical patent/US10436974B2/en
Publication of WO2018126701A1 publication Critical patent/WO2018126701A1/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
    • 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
    • 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
    • G02B6/0066—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

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a backlight module and a display device.
  • HDR High-Dynamic Range
  • images generally refer to images that display a very wide range of brightness.
  • the technique of making and displaying high dynamic range images is often referred to as HDR technology.
  • HDR technology When making and displaying high dynamic range images, the most important thing is to make the image have sufficient brightness and the brightness of the image has a large dynamic range.
  • HDR technology is applied to products such as liquid crystal displays or LCD TVs, which can greatly improve the picture quality.
  • higher requirements have been placed on the backlight module of the liquid crystal display device. Since the edge-lit backlight module meets the thin requirements of the current display device and can provide a bright and uniform planar light source, most liquid crystal display devices use an edge-lit backlight module.
  • the edge-lit backlight module generally includes a light guide plate and a light bar disposed on the light-incident surface of the light guide plate. Due to the limited installation space of the light bar, in order to reduce the influence of heat concentration, the number of light-emitting diodes of the light bar is limited, and thus the brightness range of the backlight module is limited, and the backlight module cannot satisfactorily meet the brightness requirement of the HDR.
  • the embodiments of the present disclosure provide a backlight module and a display device to increase the brightness range of the side-entry backlight module, thereby improving the HDR display effect of the display device.
  • the backlight module provided by the present disclosure includes at least two layers of side-entry light guide plates stacked, and light bars disposed at the light incident surface of each of the side-entry light guide plates, and each layer of the side-entry light guide plate The bottom surface has optical dots.
  • the backlight module in the embodiment of the present disclosure includes at least two layers of side-entry light guide plates, each of which is provided with a light bar, which increases the number of light bars of the backlight module, thereby increasing the maximum of the backlight module.
  • the brightness also increases the range of brightness variation of the backlight module as a whole.
  • the light bars of each layer of the side-lit light guide plate can be separately controlled, thereby increasing the brightness range of the backlight module. Therefore, the backlight module provided by the solution can effectively improve the HDR display effect of the display device.
  • each of the side-entry light guide plates has a light incident surface, and the light incident surfaces of the adjacent two side entrance light guide plates are perpendicular to each other.
  • the light incident surfaces of the adjacent two-layer side-entry light guide plates are perpendicular to each other, and the mutually perpendicular light rays can form a plurality of intersection points, and the brightness of each intersection point can be separately adjusted, which is beneficial to increase the entire display screen.
  • the range of brightness is beneficial to increase the entire display screen.
  • each of the top surfaces of the side-entry light guide plates has a plurality of strip-shaped microstructures arranged in parallel, and the strip-shaped microstructures extend in a direction perpendicular to the light-incident surface of the side-entry light guide plate.
  • the strip microstructure has a good condensing property, and the brightness of the target area can be precisely adjusted, which further improves the HDR display effect.
  • the cross-sectional shape of the strip-shaped microstructure is arcuate, semi-circular or triangular in a plane perpendicular to the extending direction.
  • each of the side-entry light guide plates has two opposite light-incident surfaces, and the light-incident surfaces of two adjacent side-mounted light guide plates are perpendicular to each other.
  • the number of the side-entry light guide plates is two.
  • the thickness of the side-lit light guide plates of each layer is the same.
  • the material of the side-entry light guide plate of each layer is the same.
  • the present disclosure also provides a display device, including the backlight module described in any one of the above technical solutions.
  • the display device in this embodiment includes the above-described backlight template, which has a large brightness range and, therefore, has a better display effect.
  • the display device is an HDR display device.
  • the above display device When the above display device is used as an HDR display device, it can sufficiently satisfy the HDR requirement and has a good HDR display effect.
  • FIG. 1 is a schematic diagram of a backlight module according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a backlight module according to another embodiment of the present disclosure.
  • FIG. 3 is a top plan view of a backlight module according to an embodiment of the present disclosure.
  • FIG. 4a is a schematic diagram of a gray-scale state of a side-entry light guide plate of a backlight module according to an embodiment of the present disclosure
  • 4b is a schematic diagram of a gray-scale state of a side-lit light guide plate of a backlight module according to another embodiment of the present disclosure
  • 4c is a schematic diagram of a gray-scale state of a side-entry light guide plate of a backlight module according to another embodiment of the present disclosure.
  • 1-side-in type light guide plate 2-light strip; 3- strip microstructure; 4-into-light surface; 5--optical dot.
  • the embodiment of the present disclosure provides a backlight module and a display device.
  • the present disclosure will be further described in detail in the following examples for the purpose of the present disclosure.
  • a backlight module provided by an embodiment of the present disclosure includes at least two layers of side-lit light guide plates 1 and a light bar 2 disposed at a light entrance surface 4 of each of the side-lit light guide plates 1 .
  • the bottom surface of each of the side-entry light guide plates 1 has an optical dot 5 .
  • the light incident surface of the side-lit light guide plate is a side surface of the light guide plate for inputting light inside the light guide plate.
  • the optical dot on the bottom surface of the side-entry light guide plate can be designed according to the light-incident surface of the side-entry light guide plate and the optical specifications of the light bar.
  • the backlight module in the embodiment of the present disclosure includes at least two layers of side-lit light guide plates 1 , each of which is provided with a light bar 2 , which increases the number of light bars 2 of the backlight module, thereby increasing the backlight.
  • the highest brightness of the module increases the brightness variation range of the backlight module as a whole.
  • the light bars 2 of each layer of the side-lit light guide plate 1 can be separately controlled, thereby increasing the brightness range of the backlight module. Therefore, the backlight module provided by the solution can effectively improve the HDR display effect of the display device.
  • each of the side-lit light guides 1 has a light-incident surface 4, and the light-incident surfaces 4 of two adjacent side-lit light guides 1 are perpendicular to each other.
  • the light-incident surfaces of the adjacent two-layer side-lit light guide plates 1 are perpendicular to each other, and the mutually perpendicular light rays entering from the light-incident surface are alternately formed to form a plurality of intersections, and the brightness of each intersection point can be adjusted separately.
  • the brightness at adjusting an intersection is large, and the effect on the surrounding brightness can be small.
  • FIG. 4a when there is no light in the mutual vertical direction, the intersection is 0 brightness; as shown in FIG. 4b, when there is light in one direction in the mutually perpendicular direction, the intersection is 50% brightness;
  • Fig. 4c when there are rays in both directions in the mutually perpendicular direction, the intersection is 100% brightness.
  • the gray scale at different points can be adjusted.
  • the light incident surfaces of the adjacent two-layer side-entry light guide plates are perpendicular to each other, so that the light beams propagating directions inside the two adjacent side-lit light guide plates are perpendicular to each other, and the mutually perpendicular light beams can enhance the intersections at the intersections. Brightness, and affect the brightness of areas outside the intersection as little as possible.
  • an optical structure such as a lens can be used to increase the directivity of the light beam emitted by the light bar 2 to achieve a high brightness intersection.
  • each layer of the side-lit light guide plate 1 has a plurality of strip-shaped microstructures 3 arranged in parallel, and the strip-shaped microstructures 3 extend perpendicularly to the side-entry light guide plate 1. Into the glossy surface.
  • the strip microstructure 3 has a good condensing property, and can accurately adjust the brightness of the target area, thereby further improving the HDR display effect.
  • the cross-sectional shape of the strip-shaped microstructures 3 is arcuate, semi-circular or triangular in a plane perpendicular to the extending direction. You can choose according to the actual situation.
  • each of the side-lit light guide plates 1 has two opposite light-incident surfaces, and the light-incident surfaces of the adjacent two-side side-lit light guide plates 1 are perpendicular to each other.
  • the number of the side-entry light guide plates 1 is two. It can meet the thinness requirements of the display module and meet the display requirements of HDR to a certain extent.
  • each layer of the side-lit light guide plate 1 is the same, and the material of each layer of the side-lit light guide plate 1 is the same.
  • the use of the side-in-one light guide plate 1 of the same specification is advantageous for processing.
  • the present disclosure also provides a display device, including the backlight module described in any one of the above technical solutions.
  • the display device in this embodiment includes the above backlight template, and the display device has a larger The brightness range, therefore, has a better display effect.
  • the display device is an HDR display device. It can fully utilize the advantages of the backlight module, has a good HDR display effect, and provides high quality images.

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

Abstract

一种背光模组及显示装置，以增加侧入式背光模组的亮度范围，进而提高显示装置的HDR显示效果。背光模组包括叠置的至少两层侧入式导光板（1），以及每层侧入式导光板（1）的入光面（4）处设置的灯条（2），每层侧入式导光板（1）的底面具有光学网点（5）。该方案增加了背光模组的亮度范围。另外，每层侧入式导光板（1）的灯条（2）可以分别控制，因此，可以增加背光模组的亮度范围。因此，该方案提供的背光模组可以有效的提高显示装置的HDR显示效果。

Description

背光模组及显示装置
相关申请
本申请要求保护在2017年1月4日提交的申请号为201720008398.2的中国专利申请的优先权，该申请的全部内容以引用的方式结合到本文中。
技术领域
本公开涉及显示技术领域，特别涉及一种背光模组及显示装置。
背景技术
HDR(High-Dynamic Range，高动态范围)图像一般是指显示亮度范围非常广的图像，人们常常将制作和显示高动态范围图像的技术称为HDR技术。在制作和显示高动态范围图像时，最重要的就是要使图像具有足够的亮度，且图像的亮度具有较大的动态范围。
目前，HDR技术被应用于液晶显示器或者液晶电视机等产品中，可以大大的提升画面质量。但是，为了充分的发挥HDR的优势，对液晶显示装置的背光模组也提出了更高的要求。由于侧光式背光模组符合当前显示装置的薄型要求，且能提供高亮、均匀的平面光源，因此，多数液晶显示装置均采用侧光式背光模组。
现有技术中，侧光式背光模组一般包括导光板和设置于导光板入光面的灯条。由于灯条的安置空间有限，为了减少热量集中的影响，灯条的发光二极管的数量有限，因此，导致背光模组的亮度范围受限，背光模组不能很好的满足HDR的亮度需求。
因此，如何增加侧入式背光模组的亮度范围，提高显示装置的HDR显示效果是本领域技术人员亟待解决的技术问题。
发明内容
本公开实施例提供了一种背光模组及显示装置，以增加侧入式背光模组的亮度范围，进而提高显示装置的HDR显示效果。
本公开提供的背光模组包括叠置的至少两层侧入式导光板，以及每层侧入式导光板的入光面处设置的灯条，每层所述侧入式导光板的 底面具有光学网点。
本公开实施例中的背光模组包括至少两层侧入式导光板，每层侧入式导光板都设置有灯条，增加了背光模组的灯条数量，进而增加了背光模组的最高亮度，也就提高了背光模组整体的亮度变化范围。另外，每层侧入式导光板的灯条可以分别控制，进而增加了背光模组的亮度范围。因此，该方案提供的背光模组可以有效的提高显示装置的HDR显示效果。
可选的，每层所述侧入式导光板具有一个入光面，相邻两层侧入式导光板的入光面相互垂直。
该可选方案中，相邻两层侧入式导光板的入光面相互垂直，相互垂直的光线可以形成多个交叉点，可以分别对各个交叉点的亮度进行调节，有利于增加整个显示画面的亮度范围。
可选的，每层所述侧入式导光板的顶面具有平行排列的多个条状微结构，所述条状微结构的延伸方向垂直于所述侧入式导光板的入光面。
该可选方案中，条状微结构具有很好的聚光性，可以对目标区域的亮度进行精确调节，进一步的提高了HDR显示效果。
可选的，在垂直于所述延伸方向的面内，所述条状微结构的截面形状是弓形、半圆形或者三角形。
可选的，每层所述侧入式导光板具有两个相对的入光面，相邻两层侧入式导光板的入光面相互垂直。
具体的，所述侧入式导光板的数量为两层。
可选的，各层所述侧入式导光板的厚度相同。
可选的，各层所述侧入式导光板的材质相同。
本公开还提供了一种显示装置，包括上述任一技术方案中所述的背光模组。
该实施例中的显示装置包括上述背光模板，该显示装置具有较大的亮度范围，因此，具有较好的显示效果。
具体的，所述显示装置为HDR显示装置。
上述显示装置作为HDR显示装置时，可以充分的满足HDR需求，具有很好的HDR显示效果。
附图说明
图1为本公开一实施例中背光模组的示意图；
图2为本公开另一实施例中背光模组的示意图；
图3为本公开一实施例中背光模组的俯视图；
图4a为本公开一实施例中背光模组的侧入式导光板灰阶状态的示意图；
图4b为本公开另一实施例中背光模组的侧入式导光板灰阶状态的示意图；以及
图4c为本公开又一实施例中背光模组的侧入式导光板灰阶状态的示意图。
附图标记：
1-侧入式导光板；2-灯条；3-条状微结构；4-入光面；5-光学网点。
具体实施方式
为了增加侧入式背光模组的亮度范围，进而提高显示装置的HDR显示效果，本公开实施例提供了一种背光模组及显示装置。为使本公开的目的、技术方案和优点更加清楚，以下举实施例对本公开作进一步详细说明。
参考图1，本公开一种实施例提供的背光模组包括叠置的至少两层侧入式导光板1，以及每层侧入式导光板1的入光面4处设置的灯条2，每层侧入式导光板1的底面具有光学网点5。
其中，侧入式导光板的入光面是指导光板的一个侧面，用于向导光板内部输入光。侧入式导光板底面的光学网点可以根据侧入式导光板的入光面和灯条的光学规格等进行相应设计。
本公开实施例中的背光模组包括至少两层侧入式导光板1，每层侧入式导光板1都设置有灯条2，增加了背光模组的灯条2数量，进而增加了背光模组的最高亮度，也就增加了背光模组整体的亮度变化范围。另外，每层侧入式导光板1的灯条2可以分别控制，进而增加了背光模组的亮度范围。因此，该方案提供的背光模组可以有效的提高显示装置的HDR显示效果。
请继续参考图1，在一个可选的实施例中，每层所述侧入式导光板1具有一个入光面4，相邻两层侧入式导光板1的入光面4相互垂直。
该可选方案中，相邻两层侧入式导光板1的入光面相互垂直，从入光面进入的相互垂直的光线交错形成多个交叉点，可以分别对各个交叉点的亮度进行调节。在调节一个交叉点的亮度较大，对周围亮度的影响可以较小。具体地，如图4a所示，当相互垂直方向均无光线时，交叉点处为0亮度；如图4b所示，当相互垂直方向中一个方向有光线时，交叉点处为50％亮度；如图4c所示，当相互垂直方向中两个方向均有光线时，交叉点处为100％亮度。再结合周边光线的控制，则可以调节不同点的灰阶。
为在交叉点处获得100％亮度，需要两个光线结合。在一些实施例中，相邻两层侧入式导光板的入光面相互垂直，因此相邻两层侧入式导光板内部的光束传播方向相互垂直，相互垂直的光束可以增强交叉点处的亮度，并且尽可能少地影响交叉点以外区域的亮度。
本领域技术人员能够理解，可以使用诸如透镜的光学结构来增加灯条2发出的光束的方向性，从而获得高亮度的交叉点。
请参考图2和图3，每层侧入式导光板1的顶面具有平行排列的多个条状微结构3，所述条状微结构3的延伸方向垂直于侧入式导光板1的入光面。
该可选方案中，条状微结构3具有很好的聚光性，可以对目标区域的亮度进行精确调节，进一步的提高了HDR显示效果。
上述方案中，在垂直于所述延伸方向的面内，条状微结构3的截面形状是弓形、半圆形或者三角形。可以根据实际情况进行选择。
在另一个具体的实施例中，每层侧入式导光板1具有两个相对的入光面，相邻两层侧入式导光板1的入光面相互垂直。
在一个具体的实施例中，所述侧入式导光板1的数量为两层。既可以满足显示模组的薄性需求，又可以在一定程度上满足HDR的显示需求。
在可选的实施例中，各层侧入式导光板1的厚度相同，各层侧入式导光板1的材质相同。采用相同规格的侧入式导光板1有利于加工制作。
本公开还提供了一种显示装置，包括上述任一技术方案中所述的背光模组。
该实施例中的显示装置包括上述背光模板，该显示装置具有较大 的亮度范围，因此，具有较好的显示效果。
进一步的，上述显示装置为HDR显示装置。可以充分的发挥背光模组的优势，具有很好的HDR显示效果，提供高质量的画面。
显然，本领域的技术人员可以对本公开实施例进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (10)

  1. 一种背光模组，包括叠置的至少两层侧入式导光板，以及每层侧入式导光板的入光面处设置的灯条，每层所述侧入式导光板的底面具有光学网点。
  2. 如权利要求1所述的背光模组，其中，每层所述侧入式导光板具有一个入光面，相邻两层侧入式导光板的入光面相互垂直。
  3. 如权利要求1所述的背光模组，其中，每层所述侧入式导光板的顶面具有平行排列的多个条状微结构，所述条状微结构的延伸方向垂直于所述侧入式导光板的入光面。
  4. 如权利要求3所述的背光模组，其中，在垂直于所述延伸方向的面内，所述条状微结构的截面形状是弓形、半圆形或者三角形。
  5. 如权利要求1所述的背光模组，其中，每层所述导光板具有两个相对的入光面，相邻两层侧入式导光板的入光面相互垂直。
  6. 如权利要求1所述的背光模组，其中，所述侧入式导光板的数量为两层。
  7. 如权利要求1～6任一项所述的背光模组，其中，各层所述侧入式导光板的厚度相同。
  8. 如权利要求1～6任一项所述的背光模组，其中，各层所述侧入式导光板的材质相同。
  9. 一种显示装置，包括如权利要求1～8任一项所述的背光模组。
  10. 如权利要求9所述的显示装置，其中，所述显示装置为HDR显示装置。
PCT/CN2017/098279 2017-01-04 2017-08-21 背光模组及显示装置 WO2018126701A1 (zh)

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