Circuitry to support justification of PWM pixels

Facsimile and static presentation processing – Static presentation processing – Attribute control

Reexamination Certificate

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C358S003010

Reexamination Certificate

active

07428075

ABSTRACT:
The methods and systems presented herein use well-known logic devices in combination with one or more pulse-width-modulation (PWM) devices in order to create left- and right-justified width-modulated pulses. In some embodiments, justification ability is added without the need to alter an existing PWM device. In some embodiments, the generation of justified pulses is accomplished by a logic circuit in combination with an inherently left- or right-justified PWM device. Some embodiments of the present invention may include, for example, any combination of logical selectors, inverters, and flip-flops. In some embodiments, a justification circuit may receive as input any combination of one or more bits of pixel data, one or more bits of justification selection data, and one or more clock signal. In some embodiments, a justification circuit may output one more signals representing left or right-justified pulses.

REFERENCES:
patent: 5477257 (1995-12-01), Murata
patent: 6252675 (2001-06-01), Jacobs
patent: 6775032 (2004-08-01), Jacobs
patent: 7031025 (2006-04-01), He et al.
patent: 7064859 (2006-06-01), Dittrich et al.
patent: 2001/0030769 (2001-10-01), Jacobs
patent: 2004/0156079 (2004-08-01), Marshall et al.

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