Patent ID: 6331060
Filing Date: 2001-12-18
Classification: G03B,H04N

Abstract:
A projection-type display device, comprising at least:a plurality of reflection-type image forming means for spatially modulating and reflecting incident light and emitting optical images rotated in plane polarization with respect to a plane polarization of the incident light;a light source for emitting illumination light;color separating and synthesizing means for breaking down the illumination light by wavelengths corresponding to the reflection-type imaging forming means and outputting the results to the reflection-type image forming means and for synthesizing optical images obtained from the reflection-type image forming means and emitting the synthesized optical image;a projection optical system for projecting the synthesized optical image to a predetermined projection object; anda polarization beam splitter for emitting a predetermined plane polarization component from the illumination light emitted from the light source to the color separating and synthesizing means and emitting the synthesized optical image obtained from the color separating and synthesizing means to the projection optical system;phase difference plates being arranged facing the light incidence/emission planes of the reflection-type image forming means;the phase difference plates setting retardations for canceling out the retardation comprised of the retardation corresponding to one-quarter of the wavelength of the incident light due to the polarization beam splitter plus retardation due to the color separating and synthesizing means.