Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-06-06
1996-12-17
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, 345 89, G09G 336
Patent
active
055858163
ABSTRACT:
Different gray shades or hues may be displayed in accordance with an active addressing technique that addresses faster responding passive matrix liquid crystal display panels (LCDs) so that video rate, high information content LCDs are perceived as having improved contrast by limiting peak voltage levels across the pixels. A preferred embodiment of the active addressing technique is implemented such that 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. Multiple 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. Two alternative gray shading techniques provide for intermediate optical states between light and dark states. A frame modulation technique uses several frame periods to control the proportion of time a pixel is light or dark. A pulse width modulation technique subdivides an addressing time interval to control the proportion of time a pixel is light or dark during the addressing time interval. Either technique addresses the pixel to an intermediate optical state.
REFERENCES:
patent: 3668639 (1972-06-01), Harmuth
patent: 3955187 (1976-05-01), Bigelow
patent: 3997719 (1976-12-01), Judice
patent: 4043640 (1977-08-01), Berreman
patent: 4060801 (1977-11-01), Stein et al.
patent: 4127848 (1978-11-01), Shanks
patent: 4203104 (1980-05-01), Kmetz
patent: 4227193 (1980-10-01), Shanks
patent: 4250503 (1981-02-01), Shanks
patent: 4253096 (1981-02-01), Kmetz
patent: 4317115 (1982-02-01), Kawakami et al.
patent: 4346378 (1982-08-01), Shanks
patent: 4380008 (1983-04-01), Kawakami et al.
patent: 4427978 (1984-01-01), Williams
patent: 4496219 (1985-01-01), Altman
patent: 4506955 (1985-03-01), Kmetz
patent: 4508427 (1985-04-01), Ross
patent: 4510444 (1985-04-01), Haussel et al.
patent: 4560982 (1985-12-01), Sonehara et al.
patent: 4630122 (1986-12-01), Morokawa
patent: 4709995 (1987-12-01), Kuribayashi et al.
patent: 4743096 (1988-05-01), Wakai et al.
patent: 4752774 (1988-06-01), Clerc et al.
patent: 4766430 (1988-08-01), Gillette et al.
patent: 4769713 (1988-09-01), Yasui
patent: 4800382 (1989-01-01), Okanda et al.
patent: 4808991 (1989-02-01), Tachiuchi et al.
patent: 4818078 (1989-04-01), Mouri et al.
patent: 4824211 (1989-04-01), Murata
patent: 4840460 (1989-06-01), Bernot et al.
patent: 4840462 (1989-06-01), Hartmann
patent: 4857906 (1989-08-01), Conner
patent: 4991022 (1991-02-01), Canfield et al.
patent: 5010327 (1991-04-01), Wakita et al.
patent: 5055833 (1991-10-01), Hehlen et al.
patent: 5062001 (1991-10-01), Farwell et al.
patent: 5134495 (1992-07-01), Frazier
patent: 5155447 (1992-10-01), Shirochi
patent: 5189406 (1993-02-01), Humphries et al.
patent: 5420604 (1995-05-01), Scheffer et al.
Ruckmongathan, T. N. and Madhusudana, N. V., "New Addressing Techniques For Multiplexed Liquid Crystal Displays," Proceedings of the SID, vol. 24/3, 1983.
Nehring, Jurgen & Kmetz, Allan R., "Ultimate Limits for Matrix Addressing of RMS-Responding Liquid-Crystal Displays," IEEE Transactions on Electron Devices, vol. Ed-26, No. 5, May 1979.
Ruckmongathan, T. N., "A Generalized Addressing Technique for RMS Responding Matrix LCDs," IEEE 1988.
Kmetz, A. R. & Nehring, J., "Ultimate Limits for RMS Matrix Addressing," The Physics and Chemistry of Liquid Crystal Devices, pp. 105-113, 1980.
T. N. Ruckmongathan, "Some New Addressing Techniques for Rms Responding Matrix LCDs" Indian Institute of Science, Bangalore-560012 (Feb. 1988).
John A. Eldon, "Digital Correlators Suit Military Applications," EDN, vol. 29, No. 17, pp. 148-160 (Aug. 23, 1984).
John A. Eldon, "Digital Correlator Defends Signal Integrity with Multibit Precision," Electronic Design, pp. 175-185 (May 17, 1984).
"A Generalized Concept of Frequency and Some Applications," Harmuth, IEEE Transactions on Information Theory, vol. IT-14, No. 3, May 1968, pp. 375-382.
"Controlled Phase Transparencies in Coherent Optical Systems Performing Walsh & Hilbert Transformations," A. A. Vasilier, American Institute of Physics, 1978, pp. 1089-1093.
"Survey of Research and Development in the Field of Walsh Functions and Sequency Theory," H. F. Harmuth, Applications of Walsh Functions, 1973 Proceedings, Apr. 1973, pp. 1-9.
"Orthogonal Transform Coding System for Television Signals," H. Enomoto and K. Shibata, Tokyo Institute of Technology, (undated), pp. 11-17.
"Continuous Addressing Makes LCD Bright and Flicker Free," Electronics International, Mar. 29, 1979.
"Optical Pattern Addressing Utilizing Nematic Liquid Crystals," Seiji Inokuchi, Applied Optics, vol. 2, No. 10, Oct. 1972.
"A Liquid-Crystal Image Display," Y. Suzuki et al., SID 83 Digest, 1983, pp. 32 and 33.
"Ultimate Limits for RMS Matrix Addressing," A. R. Kmetz and J. Nehring, The Physics and Chemistry of Liquid Crystal Devices, Ed. by G. J. Sprokel, Plenum Press, New York, 1980, pp. 105-113.
"Brightness Uniformity in Liquid Crystal Displays," H. Kawakami, H. Hanmura, and E. Kaneko, SID 80 Digest, IEEE, 1980, pp. 28 and 29.
Clifton Benjamin R.
Scheffer Terry J.
Hjerpe Richard
In Focus Systems, Inc.
Mengistu Amare
LandOfFree
Displaying gray shades on display panel implemented with active does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Displaying gray shades on display panel implemented with active , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Displaying gray shades on display panel implemented with active will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1994784