IP Library › Granted Patent US 7,362,506
Granted Patent B2
US 7,362,506 · App. 11/741,700 · Granted Apr 22, 2008

Ultra-bright light engine for projection displays

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Quick Facts
Patent No.
US 7,362,506
App. No.
11/741,700
Granted
Apr 22, 2008
Kind
B2
Abstract

A projector incorporating a prism and a plurality of light valves for modulating light that passes though the prism, wherein the color splitting-converging prism includes a dichroic coating having multiple layers of high and low index of refraction and ¼ wavelength thickness at each desired angle of incidence for reducing dichroic shift and thereby minimizing light loss.

Claims (149)

1. For use in a projector incorporating a light engine with color splitting-converging prisms, the improvement comprising a dichroic coating having multiple layers of high and low index of refraction and index matching layers, wherein layer thicknesses and materials for said multiple layers are chosen to provide prism dichroic coatings with dichroic shifts of less than 65 nm and less than 35 nm for blue and red, respectively, and thereby increase light throughput.

2. The improvement of claim 1 , wherein said dichroic coating comprises alternating layers of TiO2 and SiO2.

3. The improvement of claim 2 , wherein said dichroic coating for the color blue is comprised of:

Thickness (um)

Material

0.19066

MgF2

0.022637

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.045302

TiO2

0.073405

SiO2

0.022637

TiO2

0.020536

TiO2

0.06900095

SiO2

0.0425814

TiO2

0.06900095

SiO2

0.0425814

TiO2

0.06900095

SiO2

0.020536

TiO2.

4. The improvement of claim 2 , wherein said dichroic coating for the color red is comprised of:

Thickness (um)

Material

0.06514

SiO2

0.0803862

TiO2

0.1302744

SiO2

0.0803862

TiO2

0.06514

SiO2

0.061165

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.1223303

SiO2

0.07548

TiO2

0.061165

SiO2

0.06514

SiO2

0.0803862

TiO2

0.1302744

SiO2

0.0803862

TiO2

0.06514

SiO2

0.083546

MgF2

0.109806

ZrO2

0.0707337

Al2O3.

5. The improvement of claim 2 , wherein said layer thicknesses and materials for said multiple layers are chosen to provide prism dichroic coatings with dichroic shifts of approximately 35 nm and 23 nm for blue and red, respectively.

6. Use of the improvement according to claim 1 in a 3-chip DMD projector utilizing one of either a Xe or UHP lamp with f#1.0-1.5.

7. Use of the improvement according to claim 1 in at least a 5-element prism within a 3-chip DMD projector.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 28, 2010
From: CHRISTIE DIGITAL SYSTEMS CANADA, INC.
To: CHRISTIE DIGITAL SYSTEMS USA, INC.
Reel/Frame 024741/0898 →
CHANGE OF NAME Recorded Sep 27, 2007
From: CHRISTIE DIGITAL SYSTEMS, INC.
To: CHRISTIE DIGITAL SYSTEMS CANADA, INC.
Reel/Frame 019892/0300 →