Title :
High-brightness projection display using spatial light modulators with polymer-dispersed liquid crystal
Author :
Kawakita, M. ; Kikuchi, H. ; Fujii, T. ; Fujikake, H. ; Aida, Toshiaki ; Takizawa, K.
Author_Institution :
Sci. & Tech. Res. Labs., Japan Broadcasting Corp., Tokyo, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
A brightness-enhanced full-color projection display using optically addressed spatial light modulators (SLMs) with light-scattering mode polymer-dispersed liquid crystal has been developed. The SLM can modulate strong unpolarized light efficiently using the light-scattering effect. The projector using SLM with a Schlieren optical system produces bright, high-contrast images. Electrical image compensation of the shading and gamma characteristics of the SLMs carried out in the driving circuits improves the spatial uniformity and grayscale representation of the projected images. The system projects a bright image of more than 1300 cd/m2 with a high extinction ratio over 130:1 on a 60-inch screen, which can be viewed in a bright living room under normal lighting conditions
Keywords :
brightness; colour displays; high definition television; liquid crystal displays; optical polymers; optical projectors; spatial light modulators; television receivers; 60 cm; Bi12SiO20; Hi-Vision TV; Schlieren optical system; driving circuits; electrical image compensation; gamma characteristics; grayscale representation; high extinction ratio; high-brightness projection display; high-contrast images; light-scattering effect; light-scattering mode; normal lighting conditions; optically addressed spatial light modulators; polymer-dispersed liquid crystal; projected images; screen; shading characteristics; spatial light modulators; spatial uniformity; unpolarized light modulation; Cathode ray tubes; Integrated optics; Liquid crystal displays; Liquid crystal polymers; Optical films; Optical modulation; Optical polarization; Optical polymers; Optical scattering; Temperature;
Journal_Title :
Broadcasting, IEEE Transactions on
