Patent ID: 6769773
Filing Date: 2004-08-03
Classification: H04N

Abstract:
A picture projection system comprising:a light source having at least one ultraviolet (UV) light emitting diode (LED)chip; a red fluorescent plate for emitting red light beam at the absorption of said UV light, a green fluorescent plate for emitting green light beam at the absorption of said UV light, and a blue fluorescent plate for emitting blue light beam at the absorption of said UV light; a programmable control means to control the amount of transmitted light from each one of said red light, said green light and said blue light; merging and focusing means to project the transmitted light onto a projection screen, wherein said control means is a programmable liquid crystal plate, and wherein one said UV LED chip each is placed behind cash said red fluorescent plate, said green fluorescent plate, and said blue fluorescent plate; a first prism to deflect said red light beam before a first said programmable control means, a second prism to defect said blue light beam before a second said programmable control means; a third said programmable control means the path of said green light beam; a first focusing lens system for focusing said red light beam from said first programmable control means onto said projection screen; a first focusing lens system for focusing said red fight beam from said first programmable control means onto said projection screen; a second focusing lens system for focusing said blue light beam from said second programmable control means onto said projection screen; and a third focusing lens system for focusing said green light beam from said third programmable control means onto to said projection screen.