Title:
A LIGHT PIPE BASED PROJECTION ENGINE
Document Type and Number:
WIPO Patent Application WO2004112373
Kind Code:
A3
Abstract:
A light pipe based projection engine includes a X-prism (190, 192, 690, 692) transmitting substantially light of a useful polarization in an output direction (112) and reflecting substantially light of a non-useful polarization in a first orthogonal direction substantially orthogonal to the output direction (112), an initial reflector (114, 128) may reflect the non-said low, said medium, and said high bands of wavelengths (106, 108, 110) in a second orthogonal direction substantially orthogonal to the output direction (112) and the first orthogonal direction, and a final reflector (118, 132) may reflect the non-said low, said medium, and said high bands of wavelengths in the output direction (112), the non-said low, said medium, and said high bands of wavelengths may be rotated substantially to light of the useful polarization by the initial (114, 128) and final reflectors (118, 132).
Inventors:
LI KENNETH K (US)
Application Number:
PCT/US2004/018189
Publication Date:
September 01, 2005
Filing Date:
June 09, 2004
Export Citation:
Assignee:
WAVIEN INC (US)
LI KENNETH K (US)
LI KENNETH K (US)
International Classes:
F21V14/00; F21V29/00; H04N; (IPC1-7): F21V29/00
Foreign References:
| US5097323A | 1992-03-17 | |||
| US6398389B1 | 2002-06-04 | |||
| US4943154A | 1990-07-24 | |||
| US4850685A | 1989-07-25 |
Other References:
See also references of EP 1647136A4
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