Full-Color Projection Display with One million pixels Using Nematic-Cholesteric Phase-Transition Liquid Crystals

Abstract

Full-color projection display with one million pixels has been developed and the optical system has been simplified by using conventional OHPs. This display uses a nematic-cholesteric phase-transition (NCPT) liquid crystal panel with a micro-color filter placed outside the panel This simple configuration provides a color OHP display with high performance and low cost One picture element of this color-projection display consists of 9 pixels in the NCPT black and white panel. Thus gray scale is also obtained by dithering using the 9 pixels, resulting in a full-color projection display The contrast ratio of 5 : 1 and the line-addressing time of 2.2 msec were achieved