The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1998
Filed:
Apr. 17, 1996
Kun-Wei Lin, Hsinchu Hsien, TW;
Han-Ping D Shieh, Hsinchu, TW;
San-Ming Chen, Taipei, TW;
Kuang-Vu Chen, Taipei Hsien, TW;
Chong-Min Chang, Taipei, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A liquid-crystal projection display system with higher efficiency is provided. The liquid-crystal projection display system comprises a double-layer square-pillar-like integrator, including an inner layer and an outer layer, having a polarization-separating thin film formed between the inner layer and the outer layer. The system also includes a converging light source for generating light converged at a point near one end surface of the double-layer square-pillar-like integrator, so that most light emitted from the light source enters the double-layer square-pillar-like integrator, and different polarized light is transmitted by being totally reflected off of surfaces of the inner layer and the outer layer respectively. A first lens is provided for forming real light spots on an image plane from virtual light spots formed by totally reflecting the different polarized light transmitted in the double-layer square-pillar-like integrator. A polarization rotator is located at the image plane, for rotating one of the polarizations of the real light spots, while keeping another one of the polarizations unchanged, so that the polarization angles of all the real light spots are identical. A second lens is provided for evenly converging and projecting light beams from the light spots with an identical linear polarization to overlay on an object.