Simulation of pixel voltage error for a-Si TFT LCD regarding the change in LC pixel capacitance

• Published in: IEEE transactions on electron devices Vol. 48; no. 2; pp. 218 - 221
• Main Authors: Zhu, Yongfu, Li, Muju, Yuan, Jianfeng, Liu, Chuanzhen, Yang, Bailiang, Shen, Dezhen
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2001; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amorphous semiconductors; Electric potential; Errors; Liquid crystal displays; Pixels; Semiconductor devices; Simulation; Thin film transistors; Voltage
• ISSN: 0018-9383; 1557-9646
• DOI: 10.1109/16.902719

LC pixel capacitance C/sub lc/, which changes with the director of liquid crystal molecules as a function of external applied voltage, has a most important impact on the pixel voltage error /spl Delta/ V/sub p/ and therefore on the electro-optics (E-O) characteristics of the LC pixel for an a-Si TFT LCD. In this paper, the pixel voltage error has been simulated for 10.4" VGA (640/spl times/480) and SVGA (800/spl times/600) a-Si TFT LCD, and in this simulation, we especially took into account the change in LC dielectric constant. We found that /spl Delta/ V/sub p/ changes with the data voltage V/sub p/. In addition, E-O characteristics of LC pixel for an a-Si TFT LCD has been investigated. The result shows that the effect of /spl Delta/ V/sub p/ on E-O characteristics is significant when V/sub p/ ranges from the threshold voltage to the saturation voltage.