Polymer dispersed liquid crystal color projection display apparatus
First Claim
1. A liquid crystal color projection display apparatus comprising:
- a single projection light source;
a color splitting means comprised of a mirror and two dichroic mirrors which product three kinds of color light having different wavelength regions from said projection light source;
three liquid crystal display elements which are transparent-scattering type liquid crystal display elements and which respectively modulate the three kinds of color light which are split from the light of said projection light source;
a color synthesis means comprising a mirror and two dichroic mirrors for synthesizing light outgoing from the liquid crystal display elements;
an optical projection system for projecting the synthesized light onto a projection screen; and
wherein the colored light travels straight along an optical axis which is perpendicular to the surface of said liquid crystal display elements and wherein each of the mirrors has essentially a same light incident angle θ and
wherein said incident angle θ
is between 15° and
35°
with respect to the normal to the surface of said mirrors.
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Accused Products
Abstract
A liquid crystal color projection display apparatus having a projection light source, a plurality of liquid crystal display elements for separately modulating lights of a plurality of colors from the projection light source and an optical projection system for projecting light to a projection screen, wherein a liquid crystal and polymer composite put between a pair of substrates each equipped with an electrode is used as the liquid crystal display element, in which a liquid crystal material is dispersed and held in a polymer matrix and the refractive index of the polymer matrix substantially agrees with the ordinary light refractive index (no) of the liquid crystal material used, a dichroic mirror is used for color splitting or color synthesis and the dependence of dichroic mirror'"'"'s spectral characteristics upon the state of polarization is decreased. Clear color images of high purity and excellent hue can be obtained. Size and the cost of the liquid crystal display apparatus can be reduced.
72 Citations
15 Claims
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1. A liquid crystal color projection display apparatus comprising:
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a single projection light source; a color splitting means comprised of a mirror and two dichroic mirrors which product three kinds of color light having different wavelength regions from said projection light source; three liquid crystal display elements which are transparent-scattering type liquid crystal display elements and which respectively modulate the three kinds of color light which are split from the light of said projection light source; a color synthesis means comprising a mirror and two dichroic mirrors for synthesizing light outgoing from the liquid crystal display elements; an optical projection system for projecting the synthesized light onto a projection screen; and wherein the colored light travels straight along an optical axis which is perpendicular to the surface of said liquid crystal display elements and wherein each of the mirrors has essentially a same light incident angle θ and
wherein said incident angle θ
is between 15° and
35°
with respect to the normal to the surface of said mirrors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification