The innate character of ink-jet instability causes the device defect in manufacturing for polymer light emitting diodes (PLED). This study develops image process skill to identify defect location; these skills include the filtering, color processing, background subtraction, dilation etc. Combination with the defect information and the predetermined head library, the ink-jet amount to patch defects can be appropriately estimated. Besides, an optimal printing route has designed with a special head driving of pre-oscillation during motion intermission. By this methodology, a 60 pL drop size from ink jet nozzle can precisely patch the PLED panel with pixel resolution of 240*73 μm, the QCIF standard. This ink-jet manufacture skill use for patch defects can increase the yield rate on line.
Chih-Jian Lin, Liang-Jiun Chen, Hsuan-Ming Tsai, Fu-Kang Chen, Yuh-Zheng Lee, J.P. LU, Kuo-Tong Lin, Kevin Cheng, "Method of Patching Element Defects by Ink-Jet Printing for Polymer Light Emitting Diodes" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP20), 2004, pp 250 - 255, https://doi.org/10.2352/ISSN.2169-4451.2004.20.1.art00057_1