Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-03-22
1991-01-15
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358148, 358236, H04N 504
Patent
active
049857703
ABSTRACT:
The invention relates to a drive apparatus for a liquid crystal display device. The voltage, to be applied to longitudinally and latitudinally arranged liquid crystal cells of the liquid crystal display device, is altered in polarity from field to field and from frame to frame, whereby the occurrence of flicker is prevented. The field discriminating device counts the numbers of lines in first and second fields by synchronizing a vertical synchronizing signal at a leading point of a field time. Thereafter the difference in the number of lines between the first and second fields is detected, the field times being thereby discriminated. When a video signal is erroneous, the field discriminating device provides a field discriminating signal, the level of which is changed alternately from field time to field time.
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Kawaguchi Takafumi
Matsumoto Toshio
Nagashima Nobuyoshi
Takeda Makoto
Yasuda Shuhei
Groody James J.
Powell Mark R.
Sharp Kabushiki Kaisha
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