Color correction filter for displays

Details Color correction filter for displays Color correction filter for displays

1999-06-22

2001-05-15

Dowling, William (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S033000, C353S084000

Reexamination Certificate

active

06231190

ABSTRACT:

CROSS-REFERENCE TO RELATED INVENTIONS
The following patents and/or commonly assigned patent applications are hereby incorporated herein by reference:
Patent No.
Filing Date
Issue Date
Title
09/311,011
May 13, 1999
Projector for
Digital Cinema
5,452,024
Nov. 1, 1993
Sept. 19, 1995
DMD Display System
FIELD OF THE INVENTION
This invention relates to the field of display systems, more particularly to projection displays, in particular to projection displays using a color-splitting mechanism.
BACKGROUND OF THE INVENTION
The market for quality projection displays is growing rapidly. At least part of this market growth is a result of the greatly improved performance of modern display systems. The increase in performance is evident in a number of areas such as increased resolution, reduced weight, greatly improved image brightness, and the introduction of true digital projection. In spite of these improvements, there is still a need in the display market for improved image quality.
SUMMARY OF THE INVENTION
Objects and advantages will be obvious, and will in part appear hereinafter and will be accomplished by the present invention, which provides a method and system for improving the color gamut of display systems. According to one embodiment of the disclosed invention, a display system is provided. The display system comprises a light source, a color splitter, at least three modulators, and at least one color correction filter. The light source provides a beam of light along a white light path. The color splitter separates the beam of light into at least three primary color light beams. The at least three primary color light beams are them selectively modulated by the at least three spatial light modulators. According to one embodiment, the color splitter is a color splitting prism assembly. According to another embodiment, the color splitter is a set of dichroic mirrors. According to one embodiment, the color splitter separates the incident beam of light into a red, green, and blue beam with the color correction filter removing portions of the yellow and blue-green light.
According to another embodiment of the disclosed invention, a method of creating an image is disclosed. The method comprises the steps of providing a beam of light, filtering the beam of light into at least three primary color light beams each comprised of light in a band of wavelengths and traveling along a separate light path, filtering the beam of light to remove portions of the beam having wavelengths between the bands of wavelengths comprising the at least three primary color light beams, selectively modulating each of the at least three primary color light beams, and focusing the at least three selectively modulated primary color light beams onto an image plane.


REFERENCES:
patent: 5452024 (1995-09-01), Sampsell
patent: 5743610 (1998-04-01), Yajima et al.
patent: 5934778 (1999-08-01), Shioya
patent: 5986815 (1999-11-01), Bryars

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