Matrix panel with an active driving system

Details Matrix panel with an active driving system Matrix panel with an active driving system

1986-02-20

1990-02-06

Brigance, Gerald

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340811, G09G 336

Patent

active

048991414

ABSTRACT:
In the matrix, a positive type liquid crystal of the twisted nematic type is driven by a thin film transistor arranged on a transparent substrate. The polarity of the video signal, originally generated for a cathode ray tube, is inverted within a driving circuit and the inverted negative video signal is used to drive the positive type liquid crystal display. In the range of voltages of the video signal which correspond to the white level, the active matrix panel is driven by stretching the voltage of the video signal such that comparable voltage-contrast characteristics are achieved with the liquid crystal display as with the cathode ray tube. Leakage current of the thin film transistor during off-periods is reduced by setting a gate voltage during the off-period which is within the range of voltage level of the power source.

REFERENCES:
patent: 4266223 (1981-05-01), Frame
patent: 4395708 (1983-07-01), Lloyd
patent: 4447812 (1984-05-01), Soneda et al.
patent: 4485380 (1984-11-01), Soneda et al.
patent: 4651148 (1987-03-01), Takeda et al.
114-SID 81 Digest, 11/6-4:25 PM, Dichroic Guest-Host Active Matrix Video Display; Minoru Hosokawa, Kouichi Oguchi, Masayuki Ikeda, Satoru Yazawa and Kenichi Endo, Suwa Seikosha Company, Ltd., Nagano-ken, Japan.
CH1520 1980-Biennial Display Research Conference, A Liquid-Crystal TV Display Panel Using a MOS Array with Gate-Bus Drivers; K. Kasahara, T. Yanagisawa, K. Sakai, T. Adachi, K. Inoue, T. Tsutsumi and H. Hori.
CH1520 1980-Bennial Display Research Conference, A Low-Leakage-Current Thin-Film Transistor for Flat-Panel Displays, F. C. Luo, I. Chen and F. Genovese.

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