LED illumination engine using a reflector

• US 20050248958A1
• Filed: 06/14/2005
• Published: 11/10/2005
• Est. Priority Date: 08/23/2001
• Status: Active Grant

• Current Assignee: Kenneth K. Li
• Original Assignee: Kenneth K. Li
• Inventors: Li, Kenneth K.
• Granted Patent: US 7,357,550 B2
• Time in Patent Office: Days
• US Class Current: 362/555
• CPC Class Codes: G02B 27/0994 Fibers, light pipes optical fibers per se G02B6/02
• CPC Class Codes: G02B 6/4298 coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48464 the other connecting portion not on the bonding area also being a ball bond, i.e. ball-to-ball
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20

Abstract

An illumination engine for a projection display using light emitting diodes (LEDs) that includes a reflector having a first and second focal points, a source of electro-luminescence located proximate to the first focal point to emit rays of radiation in a first range of wavelengths that reflect from the reflector and converge substantially at the second focal point, and a light pipe having an first input end and a first output end, the first input end being located proximate to the second focal point to collect substantially all of the radiation and wherein the first output end transmits substantially all of the radiation. The illumination system may further include a substrate having a first side, a platform disposed proximate to the first side of the substrate, and a plurality of reflectors each having a first and second focal points disposed in the platform, each of the first and second focal points disposed proximate to the first side of the substrate, a plurality of sources of electro-luminescence disposed on the first side of the substrate, each of the sources of electro-luminescence disposed substantially coincident with a corresponding one of the first focal points to emit rays of electromagnetic radiation that reflect from a corresponding one of the plurality of reflectors and converges substantially at a corresponding one of the second focal points, a plurality of light pipes disposed in the substrate, each of the light pipes having an input end and an output end, each of the input ends disposed substantially coincident with a corresponding one of the second focal points to collect substantially all of the radiation, wherein each of the output ends transmits substantially all of the radiation emitted by a corresponding one of the plurality of sources.

Claims

1. An illumination engine comprising:

a first source of electro-luminescence;

a first reflector having a first and second focal points;

a first light pipe having an first input end and a first output end;

said first source of eletro-luminscence disposed proximate to said first focal point of said first reflector to emit rays of radiation in a first range of wavelengths that reflect from said first reflector and converge substantially at said second focal point;

said first input end being located proximate to said second focal point to collect substantially all of said radiation; and

wherein said first output end transmits substantially all of said radiation.

2-139. -139. (canceled)