Patent ID: 8026986
Filing Date: 2011-09-27
Classification: H04N

Abstract:
1. A projection type display device comprising: a light source; a reflection type liquid crystal display device allowing an incidence of an illumination light from the light source through a wire-grid type polarization beam splitter for polarizing the illumination light; and an imaging lens system for providing an image from a modulated light which has been polarized, modulated and reflected by the reflection type liquid crystal display device and subsequently diverged from an optical path for the light source by the wire-grid type polarization beam splitter, wherein the reflection type liquid crystal display device includes a first transparent substrate having a transparent electrode formed therein and allowing an incidence of the illumination light, a second substrate opposed parallel to the first substrate through a gap and having reflecting electrodes and drive circuits arranged in matrix for every pixel thereby to reflect the illumination light transmitted through the first substrate and emit the illumination light therethrough and a liquid crystal layer enclosed between the first substrate and the second substrate to polarize and modulate the illumination light transmitted through the first substrate and also composed of nematic liquid crystal whose dielectric anisotropy is negative, the wire-grid type polarization beam splitter is arranged so as to have its polarization spectroscopic surface inclined to the first substrate of the reflection type liquid crystal display device, the wire-grid type polarization beam splitter also having wire grids formed on the polarization spectroscopic surface and also arranged parallel to the first substrate, the each of the reflection type liquid crystal display devices is either: assuming one of directions of projection lines obtained by projecting the wire grids on the second substrate vertically, the one direction being directed to a direction where one extension surface of the polarization spectroscopic surface intersects with another extension surface of the second substrate when the one direction is turned in the counterclockwise direction by 90°, is represented by X-axis, the first twist type liquid crystal display device has its reference line's vector disposed within a range of 225°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate, and the second twist type liquid crystal display device has its reference line's vector disposed within a range of 315°±10° in the counterclockwise direction from the direction of X-axis, in view from the first substrate.