摘要 |
<p>An active matrix LCD light valve (110, 111, 112) between crossed polarizers, utilizing individual transistors to control each ''pixel area'' of the LCD with optically shielded ''dead spaces'' between pixels to eliminate electric field crosstalk and non-information-bearing light bleed through, is illuminated with a bright independent light source (100, 101, 102) which creates a video image projected via specialized projection optics (120, 130, 140) onto an internal or external screen (150) without distortions, regardless of the angle of projection onto the screen. Use of heat sinks, IR reflective coatings, heat absorbing optics, optional fluid, and a thermistor controlled pixel transistor bias voltage injection servo circuit stabilizes image performance, maintaining accurate color and contrast levels as the LCD changes temperature. In one embodiment of the invention, use of a multi-color LCD with a stepped cavity (dr, dg, db), producing different thicknesses of LCD for the different wavelengths that pass through it, allows a linear correspondence between the wavelengths passing through the LCD to produce true black, high contrast, and CRT-like color rendition.</p> |