Optics: image projectors – Composite projected image – Plural projection paths with single light source
Reexamination Certificate
2005-06-21
2005-06-21
Mahoney, Christopher E. (Department: 2851)
Optics: image projectors
Composite projected image
Plural projection paths with single light source
C353S081000, C353S097000, C348S771000
Reexamination Certificate
active
06908197
ABSTRACT:
A TIR prism for use in projection displays, which enables angular separation of input illumination and projection light. By controlling the critical angle of a TIR surface, a portion of the illumination cone can be made to fail TIR, thereby being removed from the system prior to overlapping the projected light and lowering the image contrast. Since this truncation of the illumination aperture is translated proportionally across all optical apertures, the input aperture can be increased to overcome the loss of image brightness due to removing this portion of the illumination. In addition, other TIR surfaces are incorporated to remove unwanted diffracted light from OFF-pixels and flat-surfaces soon after this light enters the prism, preventing it from scattering into the desired projected light path from the ON-state pixels. Also, the projector's lamp reflector(s) and light integrator can be shaped to provide a “D” shaped aperture, defined by the TIR prism, for collection and transmission of projected light having optimal brightness and contrast.
REFERENCES:
patent: 6601974 (2003-08-01), Hewlett et al.
patent: 6637894 (2003-10-01), Dewald et al.
patent: 6773120 (2004-08-01), Colpaert
patent: 2003/0123162 (2003-07-01), Penn
patent: 2003/0147158 (2003-08-01), Penn
patent: 2003/0151834 (2003-08-01), Penn
Brady III Wade James
Brill Charles A.
Mahoney Christopher E.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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