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

Author

Zhu, Yongfu ; Li, Muju ; Yuan, Jianfeng ; Liu, Chuanzhen ; Yang, Bailiang ; Shen, Dezhen

Author_Institution

Lab. of Excited State Process, Acad. Sinica, Changchun, China

Volume

48

Issue

2

fYear

2001

fDate

2/1/2001 12:00:00 AM

Firstpage

218

Lastpage

221

Abstract

LC pixel capacitance C_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 Δ V_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 (640×480) and SVGA (800×600) a-Si TFT LCD, and in this simulation, we especially took into account the change in LC dielectric constant. We found that Δ V_p changes with the data voltage V_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 Δ V_p on E-O characteristics is significant when V_p ranges from the threshold voltage to the saturation voltage

Keywords

amorphous semiconductors; capacitance; electric potential; elemental semiconductors; errors; liquid crystal displays; permittivity; thin film transistors; 10.4 in; 480 pixel; 600 pixel; 640 pixel; 800 pixel; LC pixel capacitance; Si; VGA; a-Si TFT LCD; dielectric constant; electro-optics characteristics; external applied voltage; liquid crystal display; pixel voltage error simulation; saturation voltage; threshold voltage; Capacitance; Capacitance-voltage characteristics; Capacitors; Dielectric constant; Electrodes; Equivalent circuits; Liquid crystal displays; Liquid crystals; Thin film transistors; Threshold voltage;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.902719

Filename

902719