Single panel color video projection display using reflective banded color falling-raster illumination

• US 6,870,581 B2
• Filed: 10/30/2001
• Issued: 03/22/2005
• Est. Priority Date: 10/30/2001
• Status: Expired due to Fees

• Current Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Li, Lin, Vernon, George Stuart, Sampsell, Jeffrey Brian, Saroya, Jagtar Singh
• Primary Examiner(s): Kostak, Victor R.
• Application Number:
  US10/003,947
• Publication Number:
  US 20030081150A1
• Time in Patent Office: 1,239 Days
• Field of Search: 348/756, 348/760, 348/761, 348/766, 348/771, 348/781, 348/782, 349 7- 9, 353/30, 353/33, 353/34, 353/37, 359/209, 359/212, 359/216, 359/219, 359/627, 359/629, 359/638
• US Class Current: 348/756
• CPC Class Codes: H04N 9/3117 by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands

Abstract

A projection display system. The projection system includes a light source, illumination optics that are capable of splitting the light from the source into individual color bands, and folding mirrors. The folding mirrors operate to direct the color bands to a reflective element that has a contoured surface. The contoured surface of the reflective element causes the light to form into scanning rasters that are recombined and sent to a spatial light modulator. The spatial light modulator is typically made up of a panel of individually addressable elements. If the spatial light modulator requires polarized light, a polarizing beam splitter and quarter-wave plate are included as part of the illumination optics.

Claims

1. A projection display system, comprising:

a light source operable to produce a white light beam;

illumination optics operable to separate the white light beam into at least two beams of light each of different colors;

a panel of individually addressable elements;

a spinning reflective element operable to reflect the at least two beams of light from the illumination optics to the panel of individually addressable elements as a scanning raster, and

projection optics operable to project an image received from the panel to a display surface.

2. The projection display system of claim 1, wherein the illumination optics further comprise:

a light integrator operable to receive the light from the light source;

a polarizing beam splitter and quarter-wave plate operable to receive the light from the light integrator and rotate the light to a polarization state 90 degrees away from a current polarization state;

dichroic mirrors operable to receive the light from the polarizing beam splitter and split the light into at least two colors;

fold mirrors operable to reflect light received from the dichroic mirrors to the spinning reflective element, wherein there is a fold mirror for each of the colors;

a field lens operable to allow telecentric illumination.

3. The projection display system of claim 2, wherein the illumination optics further comprise relay optics between the polarizing beam splitter and the spinning reflective element.

4. The projection display system of claim 1, wherein the illumination optics further comprise:

a light integrator operable to receive the light from the light source;

dichroic mirrors operable to receive the light from the light integrator and split the light into at least two colors;

fold mirrors operable to reflect light received from the dichroic mirrors to the spinning reflective element, wherein there is fold mirror for each of the colors; and

a field lens operable to allow telecentric illumination.

5. The projection display system of claim 1, wherein the panel of individually addressable elements further comprises a transmissive liquid crystal display panel.

6. The projection display system of claim 1, wherein the panel of individually addressable elements further comprises a reflective liquid crystal display panel.

7. The projection display system of claim 1, wherein the panel of individually addressable elements further comprises a digital micromirror device panel.

8. The projection display system of claim 1, wherein the projection optics further comprises a projection lens.

9. The projection display system of claim 1, wherein the projection optics further comprise a projection lens and a second polarizing beam splitter.