Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1993-12-28
1996-02-06
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345103, 345210, 359 55, G09G 336
Patent
active
054899192
ABSTRACT:
A driving method of a liquid crystal display element having plural numbers of scanning electrodes and data electrodes where a J.times.L number (J and L are each integers.gtoreq.2) of scanning electrodes are divided into J subgroups each having L scanning electrodes so that the subgroups are selected and driven as a batch. The subgroups are selected while the following conditions are satisfied: (1) in L=k.multidot.N.multidot.T/.tau., a value satisfying k=10-250 is determined, where L is the number of row electrodes selected, N is the total number of row electrodes, T is a selection time of a single scanning electrode and .tau. is an average response time of a liquid crystal display element; (2) in a selection time, a voltage is applied to the scanning electrodes in a positive or negative direction with respect to an intermediate voltage, and in a non-selection time, the intermediate voltage is applied to the same, (3) for a selection voltage matrix, an orthogonal matrix A having L rows and elements of +1 and -1 which correspond respectively to a positive voltage and a negative voltage, is selected, and (4) in a selection time of the scanning electrode subgroups, application of the voltage is so made that elements of a column vector in the selection voltage matrix correspond to the amplitudes of the voltage to the scanning electrodes forming the scanning electrode subgroups.
REFERENCES:
"Some New Addressing Techniques for RMS Responding Matrix LCD's" by T. N. Ruckmongathan, Thesis Submitted for the Degree of Doctor of Philosophy, Dept. of Electrical Communication Engineering, Indian Institute of Science, Feb. 1988.
"New Addressing Technical for Multiplexed Liquid Crystal Displays", by T. N. Ruckmongathan and N. V. Madhusudana, Proceedings of the SID, vol. 24/3, 1983.
1988 Int'l Display Research Conference, "A Generalized Addressing Technique for RMS Responding Matrix LCDS", by T. N. Ruckmongathan, pp. 80-85.
"A New Addressing Technique for Fast Responding STN LCDs", T. Ruckmongathan, et al., Japan Display, 1992, pp. 65-68.
"Ultimate Limited for Matrix Addressing of RMS-Responding Liquid-Crystal Displays", J. Nehring, et al.; IEEE Transations on Electron Devices, vol. ED-26, No. 5, May 1979, pp. 795-802.
Hasebe Hiroshi
Koh Hidemasa
Kuwata Takeshi
Nagano Hideyuki
Nakagawa Yutaka
Asashi Glass Company Ltd.
Hjerpe Richard
Lao Lun-Yi
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