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Volume: 16 | Article ID: art00074_1
Quasi-Center-Weighted PWM Multi-level LED Printhead with Non-linear Exposure Uniformity Correction
  DOI :  10.2352/ISSN.2169-4451.2000.16.1.art00074_1  Published OnlineJanuary 2000

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.

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Isaac Ajewole, Yee S. Ng, "Quasi-Center-Weighted PWM Multi-level LED Printhead with Non-linear Exposure Uniformity Correctionin Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP16),  2000,  pp 287 - 292,

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