TN液晶补偿(Compensation of TN LCD)和OCB液晶补偿(Compensation of OCB LCD)

时间:2013-05-03 13:56:54 来源:www.ukthesis.org 作者：英国论文网 点击:102次

2.2 Compensation of TN LCD TN液晶补偿 Chen proposed [2] a compensation film for E-mode TN LCD using two positive O -plates having the same tilt angle and phase retardation values. The compensation film was applied on both sides of the TN liquid crystal cell. In this study, we examined a configuration where two positive O-plates have different optical properties. As an example, Figure 2 is an isocontrast plot  corresponding to the compensation film having the following parameters,θV1 = 70 °,θV2 = 30 °,θV3 = 10 °, andθV4 = 0°, and the substrate has Rth = -160 nm. Phase retardation values for C and D are 100 nm and 40 nm, respectively. The film is applied to the E-mode TN LCD and placed on both sides of a TN LC cell. The compensation film is placed such that the O -plate E is adjacent to the TN LC cell, and x direction is perpendicular to the rubbing direction of the bordering TN LCD cell bounding plane. The new compensation film has a contrast ratio higher than 50 in almost all viewing angles up to 80° off the normal viewing direction. The isocontrast line corresponding to 100 runs beyond 70 °. This is a significant improvement over the previously known compensation scheme. Such a compensation film is also applicable to O-mode TN LCD. In this case, θV1= 60°, θV2 = 20° , θV3= 20°, θV4= 0 °, and the retardation of C and D are 140 nm and 120 nm,  respectively. The substrate has Rth= -120 nm. The corresponding isocontrast plot is shown in Figure 3.  陈提出E模式的TN液晶的补偿膜，使用两个正的O感光板，具有相同的倾斜角度和相位延迟值。适用于补偿膜施加的TN液晶盒的两侧。在这项研究中，我们研究了两个#p#分页标题#e#阳性O型板块配置具有不同的光学特性。作举个例子，图2是对应的等反差曲线的补偿膜，具有以下参数，θV1= 70°，θV2= 30°，θV3=10°，andθV4= 0°，该基底具有Rth的=-160纳米。 C和D的相位延迟值，分别为100nm和40nm的。膜被施加到E模式的TN液晶TN液晶单元的两侧下#p#分页标题#e#。补偿膜置于O感光板，E是在TN液晶单元，和x方向相邻边的TN液晶单元格边界平面的摩擦方向垂直。新的补偿膜对比度高于50，在几乎所有的可视角度可达80°，关闭正常观看方向。等反差线对应的100次超过70°。超过先前已知的补偿方案，这是一个显著的改善。这种补偿膜也适用于#p#分页标题#e#O型模式的TN液晶。在这种情况下，θV1= 60°，θV2= 20°，θV3= 20°，θV4=0°，C和D的相位差，分别是140纳米和120纳米。基板具有Rth的=-120纳米。图3中所示为相应的等反差曲线。 Figure 2 – Isocontrast plot for E- mode TN LCD with positive O - plate compensation film. 图2 - E模式正Ø - TN液晶板补偿膜的等反差图 Figure 3 – Isocontrast plot for O - mode TN LCD with positive O - plate compensation. 图3 - 为O - 等反差的模式TN液晶Ø阳性 - 板补偿图#p#分页标题#e# 2.2 Compensation of OCB LCD  OCB液晶补偿 OCB mode LCD is based on a symmetric bend state in a nematic liquid crystal. In its actual operation, the brightness of the display is controlled by an applied voltage that leads to a different degree of bend orientation within the cell. It is known to have a fast response as a result of a lack of reverse torque generation. The placement of the compensation films is shown in Figure 4. The direction of transmission axes of two polarizers and the optic axis directions of four positive A- plates are indicated by arrows. Ωand Σare compensation films having structures shown in Figure 1. These films are placed such that the x and y axes form a 45 ° angle with respect to the βand γaxes. The directions of placement are shown for compensation films Ωand Σ in Figure 5 with respect to the coordinate system (α - β- γ) attached to the display [6] . Both positive O-plates have the same properties. The tilt angles are θV1=θV3= 85° and θV2 = θV4= 5 ° . The positive A- plates placed adjacent to the polarizers have retardation values of 90 nm, whereas the ones closer to the liquid crystal cell have values of 30 nm. The negative C -plates have retardation of - 350 nm. A contrast ratio of 10 or higher is obtained in most of the viewing angle directions up to 80 ° off the normal viewing direction (see Figure 6).   OCB模式的液晶屏是基于向列型液晶中的对称的弯曲状态。在实际操作中，显示屏的亮度控制，通过所施加的电压，导致细胞内不同程度的弯曲取向。它是已知的，作为#p#分页标题#e#反向扭矩产生的结果，缺乏快速响应。图4中所示补偿膜的放置。两个偏振器和四个正A板的光轴方向透射轴的方向用箭头表示。 Ω和Σ为补偿膜，在图1所示的结构。这些膜被放置在，例如，x和y轴形成一个45°角，相对于β和γ轴的。所示的方向放置的补偿薄膜Ω和Σ的坐标系相对于在图5中（α - β-#p#分页标题#e#γ），连接到显示[6]。正面O型板块具有相同的属性。倾斜角是θV1=θV3= 85°和θV2=θV4=5°。 A-板放在相邻偏振片的阳性为90 nm的相位差值，而在液晶单元具有30nm的值。负C板的相位差为 - 350纳米。甲为10或更高的对比度，在大多数的#p#分页标题#e#视野角为80°的方向关闭正常观看方向（参见图6）。 Figure 4 – Placement of the compensation film with an OCB liquid crystal cell.  图4 - OCB模式的液晶单元的补偿膜的放置。 Figure 5 – Placement directions of compensation films Σand Ω. 图5 - 补偿膜的Σ和Ω的放置方向。 Figure 6 – Isocontrast plot for OCB mode LCD with positive O - plate compensation. The film  http://ukthesis.org/ygsslwdx/ placement is according to Figure 4.  图6 - OCB模式液晶等反差，正O- 板补偿膜的位置根据图4。 (责任编辑：ukthesis.org)