Computer graphics processing and selective visual display system – Display driving control circuitry – Intensity or color driving control
Reexamination Certificate
2005-09-20
2005-09-20
Eisen, Alexander (Department: 2674)
Computer graphics processing and selective visual display system
Display driving control circuitry
Intensity or color driving control
C345S077000, C345S089000, C345S208000
Reexamination Certificate
active
06947060
ABSTRACT:
An image forming apparatus which performs pulsewidth modulation with a pulsewidth set by counting a clock. Especially, for grayscale level correction by setting the frequency of the clock, the periodic clock is counted, and an output pattern is changed in accordance with a count value of the clock. Otherwise, information corresponding to a clock pattern is stored in advance, and the information is sequentially read and used as a clock. Otherwise, a clock source in which the frequency is controlled by a control signal is used.
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Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
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