Illumination source and method therefor

• US 8,472,102 B2
• Filed: 10/03/2011
• Issued: 06/25/2013
• Est. Priority Date: 06/20/2007
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Grasser, Regis, Gensler, Steven Werner, Dunphy, James Christopher
• Primary Examiner(s): CHOI, WILLIAM C
• Application Number:
  US13/251,737
• Publication Number:
  US 20120026213A1
• Time in Patent Office: 631 Days
• Field of Search: 359/223.1, 359/224.1, 359/237, 359290-292, 359/298
• US Class Current: 359/237
• CPC Class Codes: G02B 27/0905 Dividing and/or superposing multiple light beams
• CPC Class Codes: G02B 27/0994 Fibers, light pipes optical fibers per se G02B6/02
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: G02B 6/12007 forming wavelength selective elements, e.g. multiplexer, demultiplexer
• CPC Class Codes: G02B 6/125 Bends, branchings or intersections
• CPC Class Codes: Y10S 362/802 Position or condition responsive switch

Abstract

An illumination source and a method therefor. A light source includes a light circuit configured to process light and direct light, and a lighting element optically coupled to the light circuit to provide multiple colors of light. The light circuit propagates light using light guides. The use of light guides eliminates the use of free space optical elements, enabling the creation of more compact light sources. Furthermore, the use of light guides may enable the creation of light sources with fewer mechanical restrictions, thereby making the light sources potentially more reliable and less expensive.

Claims

1. A method for use in connection with a display system, the method comprising:

producing light using a monolithic light source, including;

providing multiple colors of light using a lighting element,

manipulating the multiple colors of light with optical processing elements of a light circuit, and

propagating light with light guides coupled to the optical processing elements and to the lighting element;

producing images on a display plane by modulating light from the monolithic light source based on image data using a light modulator optically coupled to the monolithic light source and positioned in a light path of the monolithic light source after the monolithic light source; and

issuing modulator commands to the light modulator based on the image data using a controller electronically coupled to the light modulator and to the monolithic light source.

2. The method of claim 1, wherein the light circuit comprises optical processing elements and light guides integrated on a common substrate.

3. The method of claim 1, wherein the light circuit comprises discrete optical processing elements placed on a circuit board, and wherein the light guides comprise optical fibers.

4. The method of claim 1, wherein producing light using the monolithic light source further includes:

processing light from the lighting element using an integrated light processing element formed on a substrate;

propagating light from the lighting element to the light processing element using an integrated waveguide formed on the substrate;

using a first coupler, combining a first light beam at a first input of the light processing element with a second light beam at a second input into a first combined light beam at a first output; and

using a second coupler, combining a third light beam at the third input of the light processing element with the first combined beam into a second combined light beam at a second output.

5. The method of claim 1, wherein the light modulator is selected from the group consisting of:

digital micromirror device, transmissive or reflective liquid crystal display, liquid crystal on silicon, ferroelectric liquid-crystal-on-silicon, deformable micromirror, scanning mirror, and combinations thereof.

6. A method for use in connection with a display system, the method comprising:

providing multiple colors of light using a lighting element; and

propagating and processing the multiple colors of light using a light circuit optically coupled to the lighting element, including;

propagating light from the lighting element using an integrated waveguide formed on a substrate;

processing light propagated using the waveguide using an integrated light processing element formed on the substrate;

using a first coupler, combining a first light beam at a first input of the light processing element with a second light beam at a second input into a first combined light beam at a first output; and

using a second coupler, combining a third light beam at the third input of the light processing element with the first combined beam into a second combined light beam at a second output.

7. The method of claim 6, further comprising:

producing images on a display plane by modulating light from the light circuit based on image data using a light modulator optically coupled to the light circuit and positioned in a light path of the light circuit after the light circuit; and

issuing modulator commands to the light modulator based on the image data using a controller electronically coupled to the light modulator and to at least one of the lighting element and light circuit.