Bistable display with permuted excitation

Details Bistable display with permuted excitation Bistable display with permuted excitation

1989-08-14

1991-07-23

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

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

340719, 340811, G09G 336

Patent

active

050347365

ABSTRACT:
A liquid-crystal display system includes a display having a bistable liquid-crystal material, such as a ferroelectric material, and two sets of electrodes disposed substantially perpendicularly to each other and on opposite sides of a layer of the liquid-crystal material. In each set of electrodes, drive circuitry is connected via resistors to front terminals of each of the electrodes, and via resistors to back terminals of each of the electrodes. The drive circuitry provides further that drivers having equal number of output drive ports are coupled via a network of electrical conductors to the front terminals and the back terminals of electrodes in each set of the electrodes in accordance with an arrangement wherein the front terminals are arranged in groups such that, within each group, the front terminals are connected to corresponding ports of a driver. A similar arrangement is provided for the connection of the back ports to a driver subject to the proviso that the terminals in the various groups are coupled to the driver ports by a permuted arrangement allowing each electrode in a set of electrodes to be unambiguously identified by a pair of driver ports wherein one port of the pair is in the driver connected to the front terminals of the electrodes and the other port is in the driver connected to the back terminals of the set of electrodes.

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patent: 4655550 (1987-04-01), Crossland et al.
patent: 4759609 (1988-07-01), Clerc
patent: 4922240 (1990-05-01), Duwaer

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