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US 7,126,649 B2Granted
Oblique plate compensators for projection display systems
AssigneeColorLink, Inc.
InventorsJianmin Chen, Michael G. Robinson, Gary D. Sharp
Life of this patent
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Abstract
Projection systems having o-plate compensation elements are described. The compensation elements may be negative, positive or biaxial anisotropic element and may have a homogeneous tilt or a splayed tilt. The compensation elements may be formed from a polymer liquid crystal. The compensation elements are designed to maximize azimuth-averaged contrast. The compensation elements may be placed on the same side of a liquid crystal panel when a micro-lens array is used to improve the ease of manufacture.
Claims51
A projection system comprising:
- a plurality of light-producing portions, each of the light-producing portions operable to produce modulated light of certain color spectra;
- a light-directing element operable to receive the modulated light spectra from the light-producing portions and to combine those modulated light spectra;
- and
- a projection lens operable to project the combined modulated light spectra onto a display surface;
- wherein at least one of the plurality of light-producing portions comprises:
- a light source operable to produce light;
- a first panel, operable to receive light from the light source and to modulate the received light;
- and
- a first oblique anisotropic compensation element adjacent to the first panel, the first oblique anisotropic compensation element being operable with the projection lens to provide an azimuthally averaged, improved contrast image upon the display surface relative to an uncompensated image, wherein the improvement to the image on the display surface is relatively independent of the point of view of an observer.
6 more elements
A projection system comprising:
- a plurality or light-producing portions, each of the light-producing portions operable to produce modulated light of certain color spectra;
- a light-directing element operable to receive the modulated light spectra from the light-producing portions and to combine those modulated light spectra;
- and
- a projection lens operable to project the combined modulated light spectra onto a display surface;
- wherein at least one of the plurality of light-producing portions comprises:
- a light source operable to produce light;
- a first panel, operable to receive light from the light source and to modulate the received light;
- and
- a first oblique anisotropic compensation element adjacent to the first panel, first oblique anisotropic compensation element being operable with the projection lens to provide an azimuthally averaged, improved constrast image upon the display surface relative to an uncompensated image, wherein the improvement to the image on the display surface is relatively independent of the point of view of an observer, and wherein the first oblique anisotropic compensation element is configured to change a state of polarization of off-normal incident light, and wherein the anisotropy of the first oblique compensation element is positive anisotropy.
6 more elements
Dependencies are inferred from the claim text.