High efficiency, high color purity, on-axis holographic color fi

Details High efficiency, high color purity, on-axis holographic color fi High efficiency, high color purity, on-axis holographic color fi

1995-12-26

1998-02-24

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

359 15, G02F 11335, G02B 532

Patent

active

057215987

ABSTRACT:
A liquid crystal display comprising a four-layer holographic filter that projects up to 100 percent of incident white light while providing improved color purity. The four-layer holographic filter processes normal incidence collimated white light derived from a projector and focuses red, green, and blue components of the collimated white light into separate spatial locations of a liquid crystal layer. The four-layer holographic filter includes a large spectral bandwidth volume transmission grating layer that diffracts incident collimated white light off-axis, followed by an off-axis holographic color filter comprising three separate hologram layers that include an array of off-axis volume transmission hologram lenslets designed to diffract the respective blue, green and red components of the off-axis white light back on axis and focus them onto locations of blue, green and red pixels, respectively, of the liquid crystal display layer.

REFERENCES:
patent: 4798448 (1989-01-01), van Raalte
patent: 4807978 (1989-02-01), Grinberg et al.
patent: 4850682 (1989-07-01), Gerritsen
patent: 4856869 (1989-08-01), Sakata et al.
patent: 4960314 (1990-10-01), Smith et al.
patent: 4981332 (1991-01-01), Smith
patent: 5046827 (1991-09-01), Frost et al.
patent: 5299037 (1994-03-01), Sakata
patent: 5506701 (1996-04-01), Ichikawa
patent: 5513025 (1996-04-01), Watanabe et al.

Affiliated with

Also associated with

Rating

High efficiency, high color purity, on-axis holographic color fi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High efficiency, high color purity, on-axis holographic color fi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High efficiency, high color purity, on-axis holographic color fi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1877897