Projection type display
First Claim
1. A projection type display comprising:
- a color separating optical system for separating an emitted light from a light source into respective lights of color components of red, green and blue, having a first dichroic mirror functioning as a low-pass filter to pass the red light and a second dichroic mirror functioning as a high-pass filter to pass the blue light;
three light valves having at least a polarizing plate on each light exiting side thereof, modulating the light of each color component of red, green, and blue; and
a color synthesizing optical system for synthesizing each exiting light from each light valve, having a first dichroic prism functioning as a low-pass filter to pass the red light and a second dichroic prism functioning as a low-pass filter to pass the red light and the green light.
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Accused Products
Abstract
The present invention relates to a projection type display using a transmission type liquid crystal light valve, and its object is to supply a projection type display capable of exhibiting a high quality gradation display by preventing a leak current at a switching device. The projection type display comprises three liquid crystal light valves 21R, 21G, and 21B which have polarizing plates 20Rp, 20Gp, and 20Bp, modulate in intensity and emit each light of color components of red, green, and blue, and a dichroic prism to synthesize exiting lights from respective light valves. The projection type display is structured to arrange half-wave plates 20Ri, and 20Gi between the liquid crystal light valves 21R, and 21G for red and green, to set a polarizing direction of an exiting light of a blue component orthogonal to polarizing directions of the other two exiting lights.
52 Citations
8 Claims
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1. A projection type display comprising:
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a color separating optical system for separating an emitted light from a light source into respective lights of color components of red, green and blue, having a first dichroic mirror functioning as a low-pass filter to pass the red light and a second dichroic mirror functioning as a high-pass filter to pass the blue light;
three light valves having at least a polarizing plate on each light exiting side thereof, modulating the light of each color component of red, green, and blue; and
a color synthesizing optical system for synthesizing each exiting light from each light valve, having a first dichroic prism functioning as a low-pass filter to pass the red light and a second dichroic prism functioning as a low-pass filter to pass the red light and the green light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification