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Quasi-Center-Weighted PWM Multi-level LED Printhead with Non-linear Exposure Uniformity Correction

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A Quasi-Center-Weighted PWM exposure scheme (with stretched bit) was created for a Multi-level LED printhead that reduces the exposure time difference between available exposure levels; thereby enabling better non-uniformity correction at very high printing speed. Also this technology still maintains the advantages of centered line with sharper text/graphics and the lower current spike (not all the pixels are turned on or turned off at the same time) of the regular Center-Weighted PWM system at the same time. Working together with a non-linear exposure non-uniformity correction method that obtains non-uniformity correction and gray level simultaneously, this system is shown to produce uniformity of ∼ 0.5% throughout the dynamic range of exposure of the multi-level printing system at high speed.

Document Type: Research Article

Publication date: 2000-01-01

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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