2.2 Compensation of TN LCD
TN液晶補償
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. 
陳提出E模式的TN液晶的補償膜，使用兩個正的O感光板，具有相同的傾斜角度和相位延遲值。適用于補償膜施加的TN液晶盒的兩側。在這項研究中，我們研究了兩個#p#分頁標題#e#陽性O型板塊配置具有不同的光學特性。作舉個例子，圖2是對應的等反差曲線的補償膜，具有以下參數，θV1= 70°，θV2= 30°，θV3=10°，andθV4= 0°，該基底具有Rth的=-160納米。 C和D的相位延遲值，分別為100nm和40nm的。膜被施加到E模式的TN液晶TN液晶單元的兩側下#p#分頁標題#e#。補償膜置于O感光板，E是在TN液晶單元，和x方向相鄰邊的TN液晶單元格邊界平面的摩擦方向垂直。新的補償膜對比度高于50，在幾乎所有的可視角度可達80°，關閉正常觀看方向。等反差線對應的100次超過70°。超過先前已知的補償方案，這是一個顯著的改善。這種補償膜也適用于#p#分頁標題#e#O型模式的TN液晶。在這種情況下，θV1= 60°，θV2= 20°，θV3= 20°，θV4=0°，C和D的相位差，分別是140納米和120納米。基板具有Rth的=-120納米。圖3中所示為相應的等反差曲線。
Figure 2 – Isocontrast plot for E- mode TN LCD with positive O - plate compensation film.
圖2 - E模式正Ø - TN液晶板補償膜的等反差圖
Figure 3 – Isocontrast plot for O - mode TN LCD with positive O - plate compensation.
圖3 - 為O - 等反差的模式TN液晶Ø陽性 - 板補償圖#p#分頁標題#e#
2.2 Compensation of OCB LCD 
OCB液晶補償
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對稱的彎曲狀態。在實際操作中，顯示屏的亮度控制，通過所施加的電壓，導致細胞內不同程度的彎曲取向。它是已知的，作為#p#分頁標題#e#反向扭矩產生的結果，缺乏快速響應。圖4中所示補償膜的放置。兩個偏振器和四個正A板的光軸方向透射軸的方向用箭頭表示。 Ω和Σ為補償膜，在圖1所示的結構。這些膜被放置在，例如，x和y軸形成一個45°角，相對于β和γ軸的。所示的方向放置的補償薄膜Ω和Σ的坐標系相對于在圖5中（α - β-#p#分頁標題#e#γ），連接到顯示[6]。正面O型板塊具有相同的屬性。傾斜角是θV1=θV3= 85°和θV2=θV4=5°。 A-板放在相鄰偏振片的陽性為90 nm的相位差值，而在液晶單元具有30nm的值。負C板的相位差為 - 350納米。甲為10或更高的對比度，在大多數的#p#分頁標題#e#視野角為80°的方向關閉正常觀看方向（參見圖6）。

Figure 4 – Placement of the compensation film with an OCB liquid crystal cell. 
圖4 - OCB模式的液晶單元的補償膜的放置。

Figure 5 – Placement directions of compensation films Σand Ω.
圖5 - 補償膜的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. 
圖6 - OCB模式液晶等反差，正O- 板補償膜的位置根據圖4。