Contrast enhanced mode (CEM) for active matrix displays

Author

Aruga, Shuji ; Shimotome, Nobuyuki ; Ohshima, Hiroyuki ; Morozumi, S.

Author_Institution

Seiko Epson Corp., Nagano, Japan

fYear

1988

fDate

4-6 Oct. 1988

Firstpage

236

Lastpage

240

Abstract

The authors have studied the optoelectrical characteristics of twisted-nematic liquid crystal (TN-LC) in detail to optimize the image quality of active-matrix liquid-crystal displays (LCDs). They have found that a specific cell condition, Delta nd=1.3-1.4, provides the highest contrast ratio. They call this TN-LC condition the CEM (contrast enhanced mode). Experimental results on contrast ratio, gray-scale capability, and response are discussed. The application of CEM to a poly-Si TFT LCD is described. The results indicate that the CEM will lead to a great improvement of image quality in TFT and MIM-LCDs and support the spread of active-matrix LCDs.<>

Keywords

liquid crystal displays; nematic liquid crystals; MIM LCD; TFT LCD; active matrix displays; contrast enhanced mode; contrast ratio; gray-scale capability; image quality; liquid-crystal displays; optoelectrical characteristics; polycrystalline Si; twisted-nematic liquid crystal; Active matrix liquid crystal displays; Active matrix technology; Birefringence; Chromium; Degradation; Image quality; Liquid crystal displays; Low voltage; Open wireless architecture; Optical polarization;

fLanguage

English

Publisher

ieee

Conference_Titel

Display Research Conference, 1988., Conference Record of the 1988 International

Conference_Location

San Diego, CA, USA

Type

conf

DOI

10.1109/DISPL.1988.11319

Filename

11319