Odd/even stroke control for reduced video data clocking

Details Odd/even stroke control for reduced video data clocking Odd/even stroke control for reduced video data clocking

1994-09-26

1997-11-25

Bost, Dwayne

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347 12, 347 41, 347 40, 358502, 358538, G06K 1500

Patent

active

056921080

ABSTRACT:
A method and apparatus for checkerboard printing by a liquid ink printing apparatus. A liquid ink printing apparatus, such as a thermal ink jet printer, includes circuitry for reducing video data clocking in checkerboard printing by controlling the odd and even vertical print strokes of a reciprocating printhead mounted to a scanning carriage. The amount of bitmapped imaged data, also known as video data, is reduced by one half or more and sent to the printhead for printing checkerboard patterns. Reduction of the bitmapped image data is accomplished by a data packer circuit which selects certain bits of the bitmapped image data for printing by the printhead in a checkerboard pattern. At the printhead, the bitmapped image is reconstructed by a data unpacker circuit to cause selective ejection of ink from the appropriate nozzles of the printhead. Two or more passes information are printed to complete printing of the bitmapped image data.

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