4.55-in. HDTV poly-Si TFT light valve for LCD projectors

Author

Matsueda, Yojiro ; Shimobayashi, Takashi ; Okamoto, Norihisa ; Yudasaka, Ichio ; Ohshima, Hiroyuki

Author_Institution

High Definition TV Eng. Corp., Tokyo, Japan

fYear

1991

fDate

15-17 Oct. 1991

Firstpage

8

Lastpage

11

Abstract

A 4.55-in. HDTV (high-definition television) poly-Si TFT (thin-film transistor) light valve with 960*1439 pixels for LCD (liquid crystal display) projectors has been developed. This is the smallest transmission-type HDTV TFT light valve yet produced, and it has an aperture ratio which is higher than 30% despite the use of a redundant TFT structure and sufficient storage capacity in the pixels. Optimization of redundant poly-Si TFT circuits with sufficient storage capacitance has realized excellent image quality suitable for HDTV. Laser cutting and deposition technology make it possible to repair most of the defects in the TFT substrate before LCD assembly. The repaired points are reliable and have no effect on the image quality because they are covered with passivation and alignment layers after repairing.<>

Keywords

high definition television; liquid crystal displays; optical projectors; thin film transistors; 1381440 pixel; 1439 pixel; 4.55 in; 960 pixel; HDTV; LCD projectors; Si thin film transistor; TFT light valve; alignment layers; image quality; laser cutting; laser deposition; passivation; polysilicon; repairing; storage capacitance; Apertures; Capacitance; Circuits; HDTV; Image quality; Image storage; Liquid crystal displays; TV; Thin film transistors; Valves;

fLanguage

English

Publisher

ieee

Conference_Titel

Display Research Conference, 1991., Conference Record of the 1991 International

Conference_Location

San Diego, CA, USA

Print_ISBN

0-7803-0213-3

Type

conf

DOI

10.1109/DISPL.1991.167419

Filename

167419