Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1991-04-01
1996-01-16
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, G09G 336
Patent
active
054851734
ABSTRACT:
An addressing method and apparatus addresses faster responding liquid crystal display panels (LCDs) so that video rate, high information content LCDs having time constants on the order of 50 ms or less are perceived as having improved contrast by limiting peak voltage levels across the pixels. In a preferred embodiment, a first set of LCD electrodes is continuously driven with signals each comprising a train of pulses that are periodic in time, have a common period T, are independent of the information to be displayed, and are preferably orthonormal. Plural column signals are generated from the collective information states of the pixels defined by the overlap with a second electrode pattern. Each column signal is proportional to the sum, obtained by considering each pixel in the column, of the exclusive-or (XOR) products of the logic level of the amplitude of each row signal times the logic level of the information state of the pixel corresponding to that row. Hardware implementation comprises an external video source, a controller that receives and formats video data and timing information, a storage device that stores display data, a row signal generator, a column signal generator, and at least one LCD panel. Alternative embodiments provide circuits to reduce the number of column voltage levels required to generate a displayed image.
REFERENCES:
patent: 3668639 (1972-06-01), Harmuth
patent: 4127848 (1978-11-01), Shanks
patent: 4203104 (1980-05-01), Kmetz
patent: 4250503 (1981-02-01), Shanks
patent: 4317115 (1982-02-01), Kawakami et al.
patent: 4346378 (1982-08-01), Shanks
patent: 4380008 (1983-04-01), Kawakami et al.
patent: 4506955 (1985-03-01), Kmetz
patent: 4630122 (1986-12-01), Morokawa
patent: 4800382 (1989-01-01), Okanda et al.
"Orthogonal Transform Coding System for Television Signals" Hajime Enomoto, Proc. 1971, Walsh Function Symposium, pp. 11-17, AD 720-000.
"Controlled Phase Trasparencies in Coherent-Optical Systems Performing Walsh and Hilbert Transformations" A. A. Vasileu, 1978 American Institute Physics.
"A Generalized Concept of Frequency and Some Applications" IEEE Transaction on Information Thory, vol. IT-14 No. 3, May 1968.
"Optical Pattern Processing Utilizing Nematic Liquid Crystals" Seiji Inokuchi, Oct. 1972, vo. 11 No. 10, Applied Optics.
"Applications of Walsh Functions" 1973 Proceedings, Apr. 16-18, Symposium, The Catholic University of Americ, Washington, D.C. Henning F. Harmuth.
Clifton Benjamin R.
Scheffer Terry J.
Hjerpe Richard
In Focus Systems, Inc.
Mengistu Amare
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