Flat Panel Display.
Final rept. 1 May 72-23 Feb 73,
WESTINGHOUSE RESEARCH LABS PITTSBURGH PA
Pagination or Media Count:
A 100 x 100 element, 6-inch square, liquid crystal LC display was developed that is capable of presenting alphanumeric and graphical information. The display is operated in the transmissive mode using twisted nematic LC material. An alignment technique was devised that yielded excellent homogeneous alignment of the LC material over the whole 6 x 6 inch area. The problem of electrically addressing the individual elements was solved using a thin-film, field-effect transistor TFT at each X-Y junction. The individual TFT devices exhibited excellent electrical properties and the TFT array was largely free of defects and crosstalk. An electronic exerciser was constructed to test the operation of the panel at TV rates. Although the slow response time of the twisted nematic LC material precluded video imaging, high-quality alphanumeric displays were demonstrated with good contrast and legibility.
- Electrical and Electronic Equipment