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Home Processing Data Odd-even-stroke-control-for-reduced-video-data-clocking

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Details
Inventors: Donahue, Frederick A.;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Bost; Dwayne
Assistant Examiner: Legree; Tracy M.
Attorney, Agent or Firm: Krieger; Daniel J.

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.

DETAILED DESCRIPTION In accordance with one aspect of the invention, there is provided a printing apparatus having a printhead with a plurality of nozzles for printing an image on a recording medium according to a bitmap of image data having rows and columns.
The printing apparatus includes selecting means for selecting a portion of the bitmap of image data with the portion selected having selected bits and unselected bits and directing means, in communication with said selecting means, for directing the printhead to emit liquid ink from selected ones of the plurality of nozzles according to the selected bits.
A further aspect of the invention is to provide a method for printing an image on a recording medium with a printhead having a plurality of nozzles according to a bitmap of image data having rows and columns.
The method includes selecting a portion of the bitmap of image data with the portion selected having selected bits and unselected bits, transferring the selected bits only in a serial fashion and directing the printhead to emit liquid ink from selected ones of the nozzles according to the selected bits.
An additional aspect of the invention is to provide a printing apparatus having a printhead with a plurality of drivers for causing ink to be ejected from nozzles to print an image on a recording medium according to a bitmap of image data having rows and columns.
The printing apparatus includes an electronic selection circuit receiving a selected portion of the bitmap of image data and outputting selected bits of the selected portion, an electronic transfer circuit coupled to the electronic selection circuit receiving the selected bits of the selected portion and outputting the selected bits of the selected portion, and an electronic control circuit coupled to the electronic transfer circuit for receiving the selected bits of the selected portion and outputting the selected bits to selected drivers of the printhead.



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