| 摘要 |
<p>A projection-type display device comprises a first twisted nematic liquid crystal light valve (207) for controlling red light, a second twisted nematic liquid crystal light valve (206) for controlling green light and a third twisted nematic liquid crystal light valve (205) for controlling blue light, and, for example, a dichroic mirror prism (208) for combining light from the light valves to produce a coloured image. DELTA nd/ lambda for the light valves (where DELTA n is the birefringence of a twisted nematic liquid crystal material in the respective light valves, d is the thickness of the layer of liquid crystal material and lambda is the wavelength of incident light) are substantially the same.</p> |
