Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-04-04
1986-09-16
Corbin, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350345, 358232, G02F 1133, H04N 574
Patent
active
046118896
ABSTRACT:
An enchanced luminance field sequential color image display system having an image source for providing a sequence of monochrome images. The monochromatic light images are formed of first, second and third different spectral colors. A liquid crystal switching system having crossed color selective polarizers is used to transmit the second and third colors with a first direction of polarization and to transmit the first and third colors with an orthogonal direction of polarization. A liquid crystal retarder is used to rotate the direction of polarization of light incident from the crossed polarizers by ninety degrees when the retarder is in its OFF state and to transmit the light substantially unchanged when the retarder is in its ON state. The light is then coupled to an analyzing system which in one embodiment is a neutral polarizer that transmits either the second and third colors or the first and third colors, depending on the state of the liquid crystal retarder. In a second embodiment, the analyzing system is one or more color selective (pleochroic) polarizers that transmits both polarizations of the third color, while transmitting only one polarization of the first color or one polarization of the second color depending on the state of the retarder. By transmitting two of the three spectral colors in each of both directions of polarization through the retarder, a significant increase in display luminance is obtained.
REFERENCES:
patent: 2586635 (1952-02-01), Fernsler
patent: 2727441 (1955-12-01), Fulmer
patent: 2753763 (1956-07-01), Haines
patent: 3781465 (1973-12-01), Ernstoff et al.
patent: 3806227 (1974-04-01), Greubel et al.
patent: 4003081 (1977-01-01), Hilsum et al.
patent: 4025164 (1977-05-01), Doriguzzi et al.
patent: 4068926 (1978-01-01), Nakamura et al.
patent: 4232948 (1980-11-01), Shanks
patent: 4295093 (1981-10-01), Middleton
EIA Tube Engineering Advisory Counsil (TEPAC) "Optical Characteristics of Cathode Ray Tube Screens" TEPAC Pub. No. 116, p. 105, Dec. 1980.
Scheffer "Liquid Crystal Color Displays" Nonemissive Electrooptic Displays, Ed. Kmetz, Plenum Press 1975.
Angello Paul S.
Corbin John K.
Lewis David
Tektronix Inc.
Winkelman John D.
LandOfFree
Field sequential liquid crystal display with enhanced brightness does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Field sequential liquid crystal display with enhanced brightness, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Field sequential liquid crystal display with enhanced brightness will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1992220