Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-04-25
1996-03-05
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 97, G09G 336
Patent
active
054971730
ABSTRACT:
A ferro-electric liquid crystal display is multiplex addressed by blanking and strobe waveforms applied in sequence to each electrode in one set of electrodes coincidentally with data waveforms applied to a second set of electrodes. Liquid crystal material in the display is switched by a d.c. pulse of appropriate polarity, amplitude and time. The strobe waveforms have a pulse pair comprising two pulses of different amplitude and the same or different sign. Data waveforms are rectangular waveforms of opposite sign. The amplitude and ratio of leading pulses to trailing pulses in each strobe pulse pair are adjusted to obtain the desired switching and contrast. Compensation for temperature changes is arranged by measuring the temperature of the liquid crystal material and using the value obtained to adjust the amplitude value of the leading pulse in each strobe pulse pair.
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Hjerpe Richard
Nguyen Chanh
The Secretary of State for Defence in Her Britannic Majesty's Go
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