Driving method for liquid crystal display

Details Driving method for liquid crystal display Driving method for liquid crystal display

1975-06-06

1977-08-23

Trafton, David L.

Communications: electrical

Systems

With specific power supply

340324M, 350160LC, G02F 113

Patent

active

040443469

ABSTRACT:
A multifigured or matrix-type liquid crystal display is driven by an applied voltage selected so that the effective value of the voltage applied to a display segment identified visually may have the maximum ratio to the effective value of the voltage applied to a display segment not identified visually. The multi-figured display can be driven as an X-Y matrix by coupling together the corresponding segment electrodes of each figure and sequentially actuating the common electrode of each figure. In a matrix-type liquid crystal display, the respective row electrodes of each digit would be coupled together, and the column electrodes sequentially actuated, to likewise define an X-Y matrix. In such an X-Y matrix-type liquid crystal display having N electrodes sequentially actuated, the applied voltage may be predetermined so that the voltage applied across a region of the liquid crystal material between said electrodes to be rendered visually identifiable may be (.sqroot.N + 1) times as high as the voltage applied to a region of the liquid crystal material between said electrodes which is not rendered visually identifiable.

REFERENCES:
patent: 3835463 (1974-09-01), Tsukamoto et al.
patent: 3891981 (1975-06-01), Torresi
patent: 3895372 (1975-07-01), Kaji et al.
patent: 3922667 (1975-11-01), Ueda et al.
patent: 3976362 (1976-08-01), Kawakami
P. M. Alt, IBM Tech. Dis. Bul., vol. 16, No. 5, Oct. 1973, Multiplexing for Large Matrix, Dynamic Scattering, Liquid Crystal Ceus, pp. 1456, 1457.
A. R. Kmatz, 1972 SID International Symposium Digest of Tech. Papers, June 1972, pp. 66, 67, Exp. Comparison of Mult. Tech. For Liq. Xtal Disp.
P. M. Alt, Peter Pleshko, IEEE Transactions on Electron Devices, vol. ED21, No. 2, Feb. 1974, Scanning Limitations of Liquid Crystal Displays, pp. 146-155.

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