Title :
Contrast improvement of transient nematic liquid crystal image bars by retardation compensation
Author :
Hark, S.K. ; Hull, V.J.
Author_Institution :
Xerox Corp., Webster, NY, USA
Abstract :
The transient nematic liquid crystal image bar (TNLCIB) was developed for compact, low-cost printing applications. Switching of cells in the bar is through the electric-field-induced Frederiks transition. It uses a simple electronic driving circuit, requires only standard cell gap control technologies, and operates without temperature control devices over the range 20-80 degrees C. A description is given of how the contrast ratio of the device can be improved by the use of a compensator, and a simple analytic model for the compensated dark state is provided.<>
Keywords :
liquid crystal displays; nematic liquid crystals; printers; 20 to 80 degC; analytic model; compensated dark state; contrast; electric-field-induced Frederiks transition; electronic driving circuit; low-cost printing; retardation compensation; standard cell gap control; transient nematic liquid crystal image bars; Bars; Birefringence; Dark states; Liquid crystals; Optical sensors; Optical surface waves; Polarization; Printing; Temperature control; Voltage;
Conference_Titel :
Display Research Conference, 1988., Conference Record of the 1988 International
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/DISPL.1988.11303
