Studies on the Compensated Characteristics of Reflective Super Twisted Nematic Liquid Crystal Displays(RSTN-LCDs)

• Main Authors: Jun-Chang Chen, 陳俊昌
• Other Authors: Tei-Chen Chen
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/00109046509311807284

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === Reflective LCDs do not require a backlight so that their power consumption and panel weight are both reduced. It is key device for portable information products such as PDA, cell phone and digital camera. The single-polarizer reflective LCD offers a compromise between display brightness and contrast ratio, and has gradually become the mainstream approach. However, reflective LCDs have been studied intensively in recent years. There is still much room for improvement such as brightness, contrast, viewing angle and gray levels stability. The primary factor limiting the contrast ratio and narrow viewing angle achievable in a LCD are the amount of light that leaks through the display in the dark state. In this thesis, a compensator which is the combination of negative a-plate, c-plate and o-plate will be utilized to minimize the oblique leakage light in the wide viewing angle and select some parameter values for RSTN-LCDs to achieve higher viewing characteristics. We followed the standard procedure for LCD simulation. First, the one dimensional Euler-Lagrange equations for the director deformation were solved to give the director angles and for all values of z inside the LC cell for any value of applied voltage. Then reflectance was calculated by the extended Jones matrix approach of dividing the cell which includes liquid crystal layer and compensation films into many layers and treating each layer as a birefringent plate.