Printing apparatus and method for improving quality of printing image
AssigneeBenq Corporation
InventorsBen-Chuan Du, Yung-Li Li
Life of this patent
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Abstract
The present invention is related to an apparatus and a method for improving the quality of printing. The reference timings are adjusted by random values to decrease the cyclic unevenness of images associated with the conventional technique. The random values may be generated by the apparatus itself or may be received from an external device, such as a personal computer. The distance between two adjacent dots changes, and the unevenness of images is scattered to provide a higher quality of printing.
Claims14
A printing apparatus comprising:
- a print head for scanning over a printing medium, the print head comprising at least one printing element
- a timing device for generating a driving timing sequence by shifting a reference timing sequence with a random value;
- and
- a driving device, in response to said driving timing sequence, for driving said printing element to form an image by printing dots on said printing medium;
- wherein, with the shifting of said reference timing sequence, a cyclic unevenness of said image is scattered.
A print method for forming an image on a printing medium using a print head to scan over said printing medium in a predetermined direction, said print head comprising at least one printing element, said method comprising the steps of:
- generating a reference timing sequence;
- generating a driving timing sequence by shifting said reference timing sequence with a random value;
- and
- driving said printing element with said driving timing sequence to form said image on said printing medium.
Dependencies are inferred from the claim text.