Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1997-06-03
2000-08-08
Brier, Jeffery
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345210, G09G 336
Patent
active
061008672
ABSTRACT:
A segment side drive circuit, which drives segment electrodes of a liquid crystal panel, compares present display data and display data of the previous scanning period. Only when both display data correspond, the segment side drive circuit corrects the output voltage to an intermediate level according to a correction clock. Because a change is added when there is no change in the display pattern, an effect of rounding of the waveform can be equalized regardless of the display pattern, making it possible to eliminate the luminance unevenness. When the display data changes, loss of effective voltage due to correction is prevented thus suppressing an increase in the current consumption. Further it is made possible to provide two correction periods to thereby reduce spikes superposed on the common side when the display data changes, as well as eliminate the luminance unevenness.
REFERENCES:
patent: 5798740 (1998-08-01), Bitzakidis et al.
Brier Jeffery
Sharp Kabushiki Kaisha
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