Liquid crystal display having a decoder between a driver and sca

Details Liquid crystal display having a decoder between a driver and sca Liquid crystal display having a decoder between a driver and sca

1986-11-26

1989-02-28

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

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

350333, 340784, G02F 113

Patent

active

048079740

ABSTRACT:
In a matrix-type liquid crystal display driven by a driver, a scan decoder has a first number of input terminals connected to the driver and a second number of output terminals connected to scan electrodes, respectively, with the first number substantially logarithmically related to the second number. Preferably, a data decoder has a third number of input terminals connected to the driver and a fourth number of output terminals connected to data electrodes, respectively, with the third number rendered substantially equal to four times a square root of the fourth number. For the scan decoder, the driver delivers a bipolar source voltage to one of the input terminals and negative-logic and positive-logic voltages to other input terminals to make the output terminals supply a bipolar output voltage to the scan electrodes in a prescribed order. For the data decoder, the driver delivers another bipolar source voltage to one of the input terminals, L pairs of bipolar address voltages to 2L input terminals, K pairs of bipolar data signals to 2K input terminals to make the output terminals supply an output voltage to at least one data electrode at a time so that a voltage difference is applied across a liquid crystal layer at a crossover of each of the at least one data electrode and one of the scan electrodes that is applied with the output voltage from the scan decoder at that time. The third number may be substantially logarithmically related to the fourth number.

REFERENCES:
patent: 3684918 (1972-08-01), Schmersal
patent: 4145120 (1979-03-01), Kubota
patent: 4233603 (1980-11-01), Castleberry
patent: 4423432 (1983-12-01), Stewart et al.
patent: 4427997 (1984-01-01), Hareng et al.
patent: 4506955 (1985-03-01), Kmetz
patent: 4636788 (1987-01-01), Hilbrink
patent: 4641135 (1987-02-01), Hilbrink

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