Patent · US Active

Laser projection system based on a luminescent screen

US8147067B2 · kind B2 · utility

0Cited by

2References

10Claims

0Family size

Assignee

KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

Ulrich Weichmann · Aachen, DE
Peter Josef Schmidt · Aachen, DE
Gero Heusler · Eindhoven, NL

Key dates

Filing date	Sep 26, 2006
Grant date	Apr 3, 2012
Priority date	—
Expiry date	Aug 10, 2028

Classification

Technology area (CPC G)Physics
CPC primaryG02F2203/12
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A laser projection system includes at least one laser light source, a projection screen and a spatial light modulator for projecting a laser beam of the laser light source to form an image on the projection screen. The projection screen includes a luminescent layer which upon excitation by the laser beam emits blue light. The luminescent layer contains MSi6−aAlaN8−aOx+a:Eu2+ (with M=Sr, Ba,; 0≦x≦1; 0≦a≦1) as a luminescent material. With this material laser light of a laser diode emitting in the wavelength region of 405 nm can be converted to blue light of 450 nm with high efficiency. The proposed projection system, therefore, is suitable for RGB projection using laser diodes as laser light sources.

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