WO2016004699A1 - 显示装置 - Google Patents

显示装置 Download PDF

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Publication number
WO2016004699A1
WO2016004699A1 PCT/CN2014/089023 CN2014089023W WO2016004699A1 WO 2016004699 A1 WO2016004699 A1 WO 2016004699A1 CN 2014089023 W CN2014089023 W CN 2014089023W WO 2016004699 A1 WO2016004699 A1 WO 2016004699A1
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WO
WIPO (PCT)
Prior art keywords
display device
polarizer
liquid crystal
display panel
crystal layer
Prior art date
Application number
PCT/CN2014/089023
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English (en)
French (fr)
Inventor
金起满
柳在健
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/761,759 priority Critical patent/US9885904B2/en
Publication of WO2016004699A1 publication Critical patent/WO2016004699A1/zh

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    • 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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • 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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02F1/133388—Constructional arrangements; Manufacturing methods with constructional differences between the display region and the peripheral region
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

Definitions

  • At least one embodiment of the present invention is directed to a display device.
  • liquid crystal display LCD
  • the main components of the liquid crystal display device include a display panel and a backlight (Back Light Unit: BLU for short).
  • the display panel generally includes a color film substrate disposed opposite to each other, an array substrate, and a liquid crystal layer disposed therebetween.
  • the array substrate provides a driving electric field for driving the liquid crystal to deflect, and the liquid crystal is deflected during the display to control the light emitted by the backlight. After passing or not, the color filter substrate colorizes the transmitted light to realize image display.
  • the liquid crystal display device can be divided into a liquid crystal display device of a horizontal alignment mode and a liquid crystal display device of a vertical alignment mode according to a difference in a deflection state of the liquid crystal during display.
  • Typical horizontal orientation modes include IPS (In-Plane Switching), ADS (ADVanced Super Dimension Switch, also known as ADSDS, or advanced super-dimensional field conversion technology), and typical vertical orientation modes include VA (Vertical). Alignment, vertical orientation display technology, TN (Twisted Nematic).
  • At least one embodiment of the present invention provides a display device that does not cause light leakage due to a difference in optical path, has a relatively uniform brightness, and has a good display effect.
  • a display device includes a display panel including an oppositely disposed opposite substrate, an array substrate, and a liquid crystal layer disposed therebetween.
  • the display panel is divided into a central area and a peripheral area surrounding the central area, and an area corresponding to the peripheral area between the array substrate and the liquid crystal layer is provided with an additional polarizer.
  • 1 is a schematic structural view of a light guide plate
  • FIG. 2 is a schematic exploded view of a display device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural view of a light guide plate according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a central area and a peripheral area of a display panel according to an embodiment of the present invention.
  • 1-color film substrate 2-array substrate; 3-liquid crystal layer; 4-first polarizer; 5-second polarizer; 6-additional polarizer; 61-center region; 62-peripheral region; ; 71 - light source; 72 - light guide; 73 - scattering pattern.
  • a frame pair array between a backlight and a display panel is compared with a liquid crystal display device of a vertical alignment mode such as VA or TN.
  • the pressing action of the peripheral region of the substrate causes an optical path difference to be generated in the array substrate, thereby causing light leakage of the display panel, and local leakage of the display panel in the normally black mode may cause display performance degradation of the display device.
  • At least one embodiment of the present invention provides a display device including a display panel including oppositely disposed opposite substrates, an array substrate 2, and a liquid crystal layer disposed therebetween 3.
  • the display panel is divided into a central area 61 and a peripheral area 62 surrounding the central area 61.
  • the area between the array substrate 2 and the liquid crystal layer 3 corresponding to the peripheral area 62 is provided with an additional bias.
  • the opposite substrate may be a color film substrate or a transparent substrate, that is, the color film layer may be disposed on the opposite substrate or on the array substrate. In the following embodiments, the opposite substrate is used as the color filter substrate 1 as an example.
  • the width of each of the borders of the peripheral region 62 of the display panel may be 10%-20% of the display panel length H and the width V; for example, the peripheral region 62
  • the width of each border may be 10% of the display panel length H and the width V. That is, the boundary between the peripheral area 62 and the central area 61 is that the edge of the display panel is translated to the inside thereof to the length H of the display panel and the width V of 10-20%, for example, the boundary between the peripheral area 62 and the central area 61 is the display panel.
  • the edges are respectively translated to the inside thereof to the length H of the display panel and 10% of the width V.
  • the boundary between the peripheral area 62 and the central area 61 can also form other patterns, such as a circular shape, an elliptical shape, etc., as long as the additional polarizer is disposed in the area corresponding to the peripheral area, thereby avoiding the avoidance due to the optical path difference.
  • the light leakage phenomenon is not limited, and is not limited in the embodiment of the present invention.
  • the first polarizer 4 is disposed on the side of the array substrate 2 away from the liquid crystal layer 3.
  • the direction of the polarization axis of the additional polarizer 6 is the same as the direction of the polarization axis of the first polarizer 4.
  • the side of the color filter substrate 1 remote from the liquid crystal layer 3 is provided with a second polarizer 5, and the polarization axis of the second polarizer 5 is perpendicular to the polarization axis of the first polarizer 4.
  • the arrangement of the additional polarizer 6 is such that the elliptically polarized light caused by the optical path difference in the array substrate 2 is restored to the linearly polarized light, which avoids the light leakage phenomenon due to the optical path difference, that is, the display panel is effectively prevented from leaking light.
  • an offset angle within 2° is allowed between the polarization axis of the additional polarizer 6 and the polarization axis of the first polarizer 4, that is, the polarization axis of the additional polarizer 6 is opposite to the first polarizer.
  • the polarizing axis of 4 has a certain angle.
  • the additional polarizer 6 can also achieve a certain light transmission effect (for example, the transmittance of the additional polarizer 6 can be 60-80%) Even achieve the most ideal 95% light transmission. It can be seen that in at least one embodiment, the transmittance of the additional polarizer 6 can range from 60% to 95%.
  • the additional polarizer 6 may be a crystalline film including a crystal film comprising a methyl ethyl urethane (Methylol Carbamide Glycerol (MCG)) (Thin Crystal Film, abbreviated as TCF), including a methylol urea glycerol.
  • MCG Metalol Carbamide Glycerol
  • TCF Thin Crystal Film
  • the crystalline film can be formed by coating. The use of methylol urea glycerol can effectively increase the transmittance of the crystalline film.
  • the display device further includes a backlight 7 disposed on a side of the array substrate 2 away from the liquid crystal layer 3, and the backlight 7 corresponds to the central area 61.
  • the brightness may be less than the brightness corresponding to the peripheral zone 62. That is, in the display device of the embodiment of the present invention, due to the use of the additional polarizer 6, the emission luminance of the backlight 7 in the peripheral region 62 is lowered relative to the emission luminance of the central region 61 where the additional polarizer 6 is not used, that is, an additional is used.
  • the polarizer 6 has a low light transmittance, and the peripheral region 62 is darkened when the screen of the general brightness is displayed.
  • the brightness of the backlight 7 corresponding to the peripheral region 62 is set relative to the brightness of the central region 61. To be brighter. In this way, the brightness of the peripheral region 62 of the display device relative to the central region 61 can be effectively improved, and the brightness of the display device due to the provision of the additional polarizer 6 in the peripheral region 62 can be compensated for, so that the light emitted by the backlight 7 is transmitted through the additional polarized light.
  • the peripheral area 62 after the sheet 6 coincides with the brightness of the central area 61 to ensure a display effect.
  • the backlight 7 includes a light guide plate 72 and a light source 71 disposed on at least one side of the light guide plate 72.
  • the surface (either the upper surface or the lower surface of the light guide plate 72) may be provided with a scattering pattern 73.
  • the distribution density of the scattering pattern 73 may match the light transmittance of the additional polarizer 6 and/or coincide with the brightness of the light source 71 (or the distance between the scattering pattern 73 and the position of the light source 71).
  • the distribution density of the scattering pattern 73 may be inversely proportional to the transmittance of the additional polarizer 6. That is, the transmittance of the additional polarizer 6 is low, and the distribution density of the scattering pattern 73 is higher.
  • the scattering pattern 73 indicated by the triangular pattern on the surface of the light guide plate 72 in this embodiment is a newly added light transmission pattern with respect to the light guide plate shown in FIG. 1. In this embodiment, the scattering density of the scattering image 73 is larger.
  • the transmittance is about 60-80%, for example, 70%.
  • the distribution density of the scattering pattern 73 is approximately increased by about 40% with respect to the distribution density of the scattering pattern in FIG.
  • the distribution density of the scattering pattern 73 can also be inversely proportional to the distance of the light source 71.
  • the backlight 7 may be a side-in or a direct type, and the light source 71 may include an LED.
  • the distribution density of the scattering pattern 73 is inversely proportional to the distance of the light source 71, that is, the density of the portion of the scattering pattern 73 near the light source 71 is greater than the distance.
  • the density of the portion of the light source 71 With respect to the additional polarizer 6 in the present embodiment, the distribution density of the scattering pattern 73 corresponding to the peripheral region 62 in the light guide plate 72 can be set higher than the distribution density of the scattering pattern 73 corresponding to the central portion 61.
  • the design of the light guide plate 72 is mainly based on the principle of geometric optics.
  • the method adopted in the embodiment of the present invention is to add a micro feature structure on the surface of the light guide plate 72.
  • the scattering pattern 73 is disposed on the light guide plate 72.
  • a V-cut, U-cut, or triangular groove or protrusion is a tiny sawtooth or semi-circular structure that acts to change the total reflection of light in the light guide plate 72, by light from the edge.
  • the direction is oriented in the viewing direction and increases the brightness and makes the light uniform.
  • the scattering pattern 73 can be formed by engraving on the light guide plate 73 by using a diamond knife (only when a groove is formed, a "V", "U” or ⁇ pattern scratch on the surface of the light guide plate 72 is required).
  • the test proves that the brightness of the backlight 7 is increased by 10-15% by the setting of the scattering pattern 73.
  • the optical design and the molding are considered in the design of the light guide plate 72, and the use of the micro-feature structure is not only advantageous.
  • the design of the light guide plate and the injection molding of the light guide plate during the preparation process can shorten the period of product development and design, and have an important significance for improving the quality of the light guide plate 72.
  • the display device exemplified in the embodiment of the present invention can form any product or component having a display function such as a liquid crystal panel, an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the display device shown in the embodiment of the present invention is particularly suitable for forming a liquid crystal display device of a horizontal alignment mode such as IPS or ADS, and has the advantages of high pixel aperture ratio, wide viewing angle, high brightness, low power consumption, and the like.
  • the display device provided by the embodiment of the present invention, by providing an additional polarizer between the array substrate of the display panel and the liquid crystal layer and corresponding to the peripheral region, light leakage in the peripheral region of the display panel can be effectively prevented, and the peripheral region of the display panel can be improved.
  • the backlight with brighter brightness in the peripheral area than the central area ensures the uniformity of the display picture and provides good overall picture quality in the normal black mode.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
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Abstract

一种显示装置，包括显示面板，显示面板包括相对设置的对向基板（1）、阵列基板（2）以及设置于二者之间的液晶层（3），显示面板划分为中心区（61）以及围绕中心区（61）的周边区（62），阵列基板（2）与液晶层（3）之间对应着周边区（62）的区域设置有附加偏光片（6）。显示装置可以有效防止显示面板周边区（62）的漏光。

Description

显示装置 技术领域
本发明的至少一个实施例涉及一种显示装置。
背景技术
随着生活水平的提高，液晶显示装置(Liquid Crystal Display，简称LCD)已经深入人们的日常生活。液晶显示装置的主要组成部分包括显示面板(Panel)以及背光源(Back Light Unit：简称BLU)。
显示面板通常包括相对设置的彩膜基板、阵列基板以及设置于二者之间的液晶层，阵列基板提供驱动液晶发生偏转的驱动电场，液晶在显示过程中发生偏转控制背光源发出的光线的透过与否，彩膜基板对透过光线进行彩色化处理，从而实现图像显示。
按液晶在显示过程中偏转状态的不同，可以将液晶显示装置划分为水平取向模式的液晶显示装置和垂直取向模式的液晶显示装置。典型的水平取向模式包括IPS(In-Plane Switching，即横向电场效应显示技术)、ADS(ADvanced Super Dimension Switch，又称ADSDS，即高级超维场转换技术)、典型的垂直取向模式包括VA(Vertical Alignment，即垂直取向显示技术)、TN(Twisted Nematic，即扭曲向列显示技术)。
发明内容
本发明的至少一个实施例提供一种显示装置，该显示装置不会因光程差产生漏光，具有较均匀的亮度，显示效果好。
本发明的至少一个实施例提供的显示装置，包括显示面板，所述显示面板包括相对设置的对向基板、阵列基板以及设置于二者之间的液晶层。所述显示面板划分为中心区以及围绕所述中心区的周边区，所述阵列基板与所述液晶层之间对应着所述周边区的区域设置有附加偏光片。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1为一种导光板的结构示意图；
图2为本发明实施例中显示装置的分解结构示意图；
图3为本发明实施例中导光板的结构示意图；
图4为本发明实施例中显示面板的中心区与周边区的示意图。
附图标记中：
1－彩膜基板；2－阵列基板；3－液晶层；4－第一偏光片；5－第二偏光片；6－附加偏光片；61-中心区；62-周边区；7－背光源；71-光源；72-导光板；73－散射图形。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例的附图，对本发明实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于所描述的本发明的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。
本申请的发明人注意到，在IPS、ADS等水平取向模式的液晶显示装置中，与VA、TN等垂直取向模式的液晶显示装置相比，由于位于背光源与显示面板之间的边框对阵列基板周边区域的按压作用，阵列基板会产生光程差，从而导致显示面板漏光，而常黑模式下显示面板的局部漏光会导致显示装置的显示性能下降。
因此，人们希望避免液晶显示装置中由于光程差引起的漏光现象，在改善常黑模式画面显示的同时，改善显示面板周边区漏光导致的均一性差的现象。
如图2所示，本发明的至少一个实施例提供了一种显示装置，该显示装置包括显示面板，显示面板包括相对设置的对向基板、阵列基板2以及设置于二者之间的液晶层3，显示面板划分为中心区61以及围绕中心区61的周边区62，阵列基板2与液晶层3之间对应着周边区62的区域设置有附加偏 光片6。对向基板可以为彩膜基板或透明基板，也即彩膜层可以设置在对向基板上或阵列基板上。以下实施例以对向基板为彩膜基板1为例进行说明。
如图4所示，在本发明的至少一个实施例中，显示面板的周边区62的每条边框的宽度可以为显示面板长度H和宽度V的10％-20％；例如，周边区62的每条边框的宽度可以为显示面板长度H和宽度V的10％。即周边区62与中心区61的分界为显示面板的边沿向其内部分别平移至显示面板的长度H和宽度V的10-20％，例如，周边区62与中心区61的分界为显示面板的边沿向其内部分别平移至显示面板的长度H和宽度V的10％。需要注意的是，周边区62与中心区61的分界还可以形成其他图形，例如圆形、椭圆形等，只要通过在对应于周边区的区域设置附加偏光片能实现避免由于光程差引起的漏光现象即可，本发明实施例不做限定。
如图2所示，在一个实施例中，阵列基板2远离液晶层3的一侧设置有第一偏光片4，附加偏光片6的偏光轴方向与第一偏光片4的偏光轴方向相同。在一个实施例中，彩膜基板1远离液晶层3的一侧设置有第二偏光片5，第二偏光片5的偏光轴与第一偏光片4的偏光轴垂直。附加偏光片6的设置，使得在阵列基板2由光程差引起的椭圆偏光重新恢复至线偏光，这避免了由于光程差引起的漏光现象，即有效防止了显示面板漏光。
在显示装置的制备工艺中，附加偏光片6的偏光轴与第一偏光片4的偏光轴之间允许存在2°以内的偏移夹角，即附加偏光片6的偏光轴相对第一偏光片4的偏光轴存在一定的夹角，只要夹角范围在2°以内，附加偏光片6也能达到一定的透光效果(例如，附加偏光片6的透过率范围可以为60-80％)；甚至达到最理想的95％的透光效果。由此可知，在至少一个实施例中，附加偏光片6的透过率范围可以为60％-95％。
在本发明实施例中，附加偏光片6可以采用包括羟甲基脲甘油(Methylol Carbamide Glycerol，简称MCG))的晶体薄膜(Thin Crystal Film，简称TCF)，包括羟甲基脲甘油的晶体薄膜形成在阵列基板2靠近液晶层3的一侧。例如，该晶体薄膜可以通过涂覆方式形成。采用羟甲基脲甘油，能有效地提高晶体薄膜的透过率。
如图2所示，在本发明的一个实施例中，显示装置还包括背光源7，背光源7设置于阵列基板2远离液晶层3的一侧，且背光源7对应着中心区61 的亮度可以小于对应着周边区62的亮度。也即，本发明实施例的显示装置中，由于附加偏光片6的使用，背光源7在周边区62的出射亮度相对未使用附加偏光片6的中心区61的出射亮度降低，即使用了附加偏光片6使得光透过率较低，一般亮度的画面显示时周边区62会变暗，因此，在本实施例中，将背光源7对应着周边区62的亮度相对中心区61的亮度设置为更亮。这样，能有效提升显示装置的周边区62相对中心区61的亮度，弥补显示装置因在周边区62设置了附加偏光片6可能造成的亮度下降，以使得背光源7发出的光透过附加偏光片6之后的周边区62与中心区61的亮度一致，保证显示效果。
如图3所示，背光源7包括导光板72和设置于导光板72至少一侧的光源71，导光板72的表面(上表面或下表面均可)设置有散射图形(scattering pattern)73。散射图形73的分布密度可以与附加偏光片6的透光率相配合和/或与光源71的亮度(或者说散射图形73与光源71位置之间的距离)相配合。
在一个实施例中，散射图形73的分布密度可以与附加偏光片6的透光率成反比。也即，附加偏光片6的透过率低，则散射图形73的分布密度更高。图3中，本实施例中导光板72表面的三角形图案示意的散射图形73是相对图1所示的导光板新增加的透光图形，本实施例中散射图像73的分布密度更大，当由第一偏光片4形成的偏振光射入到附加偏光片6时，透过率大约在60-80％之间，例如70％。一个设计示例为：当散射图形73的分布密度与透光率成反比时，例如附加偏光片6的透过率为70％时，对应散射图形73的分布密度为1/0.7＝1.429，此时散射图形73的分布密度相对图1中的散射图形的分布密度大概增加40％左右。
或者，在至少一个实施例中，散射图形73的分布密度还可以与光源71的距离成反比。在本实施例中，背光源7可以为侧入式或直下式，光源71可以包括LED，散射图形73的分布密度与光源71的距离成反比，即散射图形73靠近光源71部分的密度大于远离光源71部分的密度。针对本实施例中的附加偏光片6，可以将导光板72中对应着周边区62的散射图形73的分布密度设置得比对应着中心区61的散射图形73的分布密度高一些。
导光板72的设计主要基于几何光学原理，本发明实施例中采用的方法是在导光板72的表面加入微特征结构。例如，散射图形73为设置在导光板72 表面(上表面或下表面)的V形(V-cut)、U形(U-cut)或三角形的凹槽或凸起。V形(V-cut)、U形(U-cut)或三角形的凹槽或凸起是微小的锯齿或半圆形结构，作用在于改变光线在导光板72中的全反射，将光由边缘方向导向视向方向,并增加亮度和使光均匀。散射图形73可以采用金刚刀在导光板73上雕刻形成(形成凹槽的时候只需要在导光板72的表面做个“V”字、“U”字或Δ模样的划痕即可)。测试证明，通过散射图形73的设置，使得背光源7的亮度提高了10-15％；而且，经实践证明，在导光板72的设计中综合光学设计和成型考虑，采用微特征结构不仅有利于导光板的设计，而且有利于导光板在制备过程中的注射成型，能使得产品开发设计期间缩短，对于提高导光板72的品质具有重要的意义。
本发明实施例所示例的显示装置可以形成液晶面板、电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。而且，本发明实施例所示列的显示装置特别适合形成IPS、ADS等水平取向模式的液晶显示装置，并具有高像素开口率、宽视角、高亮度，低能耗等优点。
在本发明实施例提供的显示装置中，通过在显示面板的阵列基板和液晶层之间、对应着周边区的区域设置附加偏光片，可以有效防止显示面板周边区的漏光，改善显示面板周边区的漏光的问题；同时，配合采用周边区比中心区的亮度更亮的背光源，保证了显示画面的均一性，在常黑模式下也可以提供良好的整体画面质量。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。
本申请要求于2014年7月8日递交的中国专利申请第201410324068.5号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (13)

  1. 一种显示装置，包括显示面板，其中，所述显示面板包括相对设置的对向基板、阵列基板以及设置于二者之间的液晶层，所述显示面板划分为中心区以及围绕所述中心区的周边区，所述阵列基板与所述液晶层之间对应着所述周边区的区域设置有附加偏光片。
  2. 根据权利要求1所述的显示装置，其中，所述阵列基板远离所述液晶层的一侧设置有第一偏光片，所述附加偏光片的偏光轴方向与所述第一偏光片的偏光轴方向相同。
  3. 根据权利要求2所述的显示装置，其中，所述对向基板远离所述液晶层的一侧设置有第二偏光片，所述第二偏光片的偏光轴与所述第一偏光片的偏光轴垂直。
  4. 根据权利要求1-3任一所述的显示装置，其中，所述附加偏光片采用包括羟甲基脲甘油的晶体薄膜，所述晶体薄膜形成在所述阵列基板靠近所述液晶层的一侧。
  5. 根据权利要求1-4任一所述的显示装置，其中，所述附加偏光片的透过率范围为60-95％。
  6. 根据权利要求5所述的显示装置，其中，所述附加偏光片的透过率范围为60-80％。
  7. 根据权利要求1-6任一所述的显示装置，还包括背光源，所述背光源设置于所述阵列基板远离所述液晶层的一侧，且所述背光源对应着所述中心区的亮度小于对应着所述周边区的亮度，以使得所述背光源发出的光透过所述附加偏光片之后的所述周边区与所述中心区的亮度一致。
  8. 根据权利要求7所述的显示装置，其中，所述背光源包括导光板和设置于所述导光板至少一侧的光源，所述导光板的表面设置有散射图形。
  9. 根据权利要求8所述的显示装置，其中，所述散射图形的分布密度与所述附加偏光片的透光率成反比。
  10. 根据权利要求8或9所述的显示装置，其中，所述散射图形的分布密度还与所述光源的距离成反比。
  11. 根据权利要求8-10任一所述的显示装置，其中，所述散射图形为V 形、U形或三角形的凹槽或凸起。
  12. 根据权利要求1-11任一项所述的显示装置，其中，所述周边区与所述中心区的分界为所述显示面板的边沿向其内部分别平移至所述显示面板的长度和宽度的10-20％。
  13. 根据权利要求1-12任一项所述的显示装置，其中，所述对向基板为彩膜基板。
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