Patent · US Active

High-density illumination system

US7520642B2 · kind B2 · utility

138Cited by
4References
14Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 5, 2007
Grant dateApr 21, 2009
Priority date
Expiry dateApr 5, 2027

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S362/80
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

A compact and efficient optical illumination system featuring planar multi-layered LED light source arrays concentrating their polarized or un-polarized output within a limited angular range. The optical system manipulates light emitted by a planar array of electrically-interconnected LED chips positioned within the input apertures of a corresponding array of shaped metallic reflecting bins using at least one of elevated prismatic films, polarization converting films, micro-lens arrays and external hemispherical or ellipsoidal reflecting elements. Practical applications of the LED array illumination systems include compact LCD or DMD video image projectors, as well as general lighting, automotive lighting, and LCD backlighting.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.