Communications: electrical – Systems – Portable self-contained
Patent
1976-08-13
1977-11-29
Curtis, Marshall M.
Communications: electrical
Systems
Portable self-contained
340166EL, 350160LC, G06F 314
Patent
active
040608018
ABSTRACT:
A method for the non-scanned matrix addressing of bar displays, particularly of the liquid crystal type, for driving all "on" elements of the display to full optical saturation and, hence, achieving uniform brightness and contrast, comprising the steps of driving the common electrodes of subordinate, "full-on" blocks of data segments with a first waveform of amplitude and frequency differing from the data signal waveform; driving the common electrode of a transitional, "top-of-the-bar" block of data segments with a second waveform of amplitude and frequency similar to a data signal waveform; and driving the common electrodes of the uppermost, "off" blocks of data segments with a waveform of frequency higher than the display cut-off frequency. Apparatus is disclosed for generating and switching the required waveforms to facilitate use of such a bar display.
REFERENCES:
patent: 3328790 (1967-06-01), Rhodes
patent: 3740717 (1973-06-01), Huener et al.
patent: 3898642 (1975-08-01), Dorey et al.
patent: 3934241 (1976-01-01), Weigert
Carl William L.
Stein Charles R.
Cohen Joseph T.
Curtis Marshall M.
General Electric Company
Krauss Geoffrey H.
Squillaro Jerome C.
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