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64‐1: Invited Paper: Ultra‐high Precision Inkjet Printing Technology for Display
Author(s) -
Kim Seog Soon,
Kim Hyun Surk,
Lee Jong Gyun,
Seo Chang Woo
Publication year - 2018
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.12244
Subject(s) - inkjet printing , oled , lens (geology) , materials science , microelectromechanical systems , inkwell , layer (electronics) , pixel , coating , liquid crystal display , digital light processing , digital printing , computer science , rgb color model , optoelectronics , optics , engineering , nanotechnology , engineering drawing , artificial intelligence , projector , composite material , physics
Inkjet technology has been used in display manufacturing since the color filter was manufactured on 2004. Also the inkjet‐printed 40 inch OLED display prototype was demonstrated on 2004. Inkjet technology has penetrated various applications of display manufacturing such as PI alignment layer coating, liquid crystal coating, micro lens for back light, black bezel and more since 2004. However, it was mainly used for the overall coating or low printing accuracy applications up to now. The conventional printing accuracy of the inkjet technology was mentioned around ± 10 to 15 µm depending upon the printing condition. Now the advanced inkjet technology, which is mainly MEMS head technology and head control method, has been applied for more accurate, uniform and reliable printing than before. So the printing accuracy of the new inkjet technology has achieved up to 2 µm micro lens gap for micro lens array without any specific micro lens position zone defining treatment. This kind of micro lens array can improve the light extraction from the OLED lighting and display panel. Based on this printing accuracy, it can be possible for RGB pixel printing to achieve over 500 ppi (pixel per inch) with the well prepared PDL (Pixel Defining Layer) pattern.