Double trace electro optic display

Details Double trace electro optic display Double trace electro optic display

1980-04-23

1982-08-24

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

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

340784, G09G 336

Patent

active

043463789

ABSTRACT:
Two waveform traces to be simultaneously displayed are sampled and converted to a series of digital sample values. An electro-optic display, e.g. a liquid crystal or electroluminescent display has a first m set and a second n set of electrodes arranged in a matrix having m.times.n display elements. The matrix may be in cartesian XY or r .theta. polar co-ordinate format. In one form the m set of electrodes are arranged in two subsets alternating with one another forming a subset m.sub.o of odd rows and a subset m.sub.e of even rows. Coded waveforms V.sub.i, each having a different shape over a period T are applied to one subset m.sub.o of the m electrodes while another voltage is applied to the other subset m.sub.e of m electrodes followed by application of V.sub.i to the subset m.sub.e and the other voltage to subset m.sub.o. Selected ones of the coded waveform V.sub.i are generated and applied to the n electrodes, the choice of such selectively produced waveforms being related for each successive n electrode to successive sample values of the two traces and the order of coded waveforms on the m set of electrodes. As a result traces are displayed at intersections where the same waveform occurs periodically and simultaneously.
The coded waveforms V.sub.i applied to the m electrodes may be produced by a pseudo random generator. The selected ones of the coded waveforms V.sub.i applied to the n electrodes may be produced by a read only memory supplied with trace sample values stored in a random access memory. A priority encoder modified each sample value of the traces as necessary to ensure that two values for any given n electrode do not appear on the same subset of m electrodes.

REFERENCES:
patent: 3975085 (1976-08-01), Yamada et al.
patent: 4127848 (1978-11-01), Shanks
patent: 4250503 (1981-02-01), Shanks

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