Industrial Technology Research Institute

San-Ming Chen

Han-Ping D Shieh

Kun-Wei Lin

Kuang-Vu Chen

Chong-Min Chang

Zu-Deh Hao

Kuang-Yu Chen

An illumination system having improved efficiency and uniformity for an image projection apparatus. The illumination system is employed for supplying an optical radiation beam along a principal axis to illuminate an object which, in a plane perpendicular to the principal axis, has a non-round cross-section. The illumination system includes: a light source for emitting light beams; a reflective mirror, having a plurality of reflective curved surfaces for reflecting the light beams emitted from the light source to form a plurality of reflective beams; and a lens plate, having a plurality of lenses, each of the plurality of lenses corresponding to a reflective curved surface of the reflective mirror to project the plurality of reflective beams onto the object, so that the plurality of reflective beams are superimposed on the object and produce a uniform illumination.

Optical illumination system having improved efficiency and uniformity

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.

High optical throughput liquid-crystal projection display system

Growing community of inventors

Taipei, Taiwan

San-Ming Chen