High definition front projector using poly-Si TFT LCD

Author

Yoneno, Kunio ; Kamakura, Hiroshi ; Nakamura, Junichi ; Yajima, Akitaka ; Karasawa, Joji ; Nakayama, Tadaaki ; Ogihara, Masanori ; Miyazawa, Yoko ; Banda, Shunji ; Okamoto, Norihisa

Author_Institution

Seiko Epson Corp., Nagano, Japan

fYear

1991

fDate

15-17 Oct. 1991

Firstpage

147

Lastpage

150

Abstract

The authors have developed an HD (high-definition) front projector using 1.38-Mpixel poly-Si TFT (thin-film transistor) LCLVs (liquid crystal light valves) that have the smallest size and the highest density of pixel of transmission types. The diagonal size of the projected image can be changed from 40 to 120-in by a zoom lens. The main optical system includes dichroic prisms in the color composition system in order to reduce asymmetric aberrations and a bias technique in which the image is projected above the horizontal level of the projector. As a result, 950 vertical TV line resolution has been achieved by adopting motion adaptive scanning line interpolation for realizing the performance of poly-Si TFT LCLVs, and the image-sticking of the motion picture has been reduced.<>

Keywords

elemental semiconductors; high definition television; large screen displays; liquid crystal displays; silicon; thin film transistors; 120 inch; 40 inch; LCD; Si; TFT; asymmetric aberrations; bias; color composition; dichroic prisms; high definition front projector; image-sticking; liquid crystal light valves; motion adaptive scanning line interpolation; polysilicon; thin-film transistor; zoom lens; HDTV; Lenses; Light sources; Mirrors; Optical distortion; Optical films; TV; Thickness control; Thin film transistors; Voltage;

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.1991.167455

Filename

167455