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Ink drop filling by a slot coating die for an electrowetting display panel
Author(s) -
Lo KuoLung,
Kao ChiaJen,
Lan KaiWei,
Cheng WeiYuan,
Liu TaJo
Publication year - 2014
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1002/jsid.256
Subject(s) - electrowetting , materials science , coating , inkwell , hexadecane , tetradecane , drop (telecommunication) , flow visualization , die (integrated circuit) , composite material , lubrication , contact angle , microfluidics , flow (mathematics) , mechanics , nanotechnology , mechanical engineering , optoelectronics , chemistry , physics , organic chemistry , dielectric , engineering
Ink drops have to be filled into the square cells for an electrowetting display panel. Several ink solutions such as dodecane, tetradecane, and hexadecane were used as test liquids. These fluids have viscosities less than 4 mPas and surface tensions between 23.3 and 26 mN/m and contact angles less than 50°. A slot coating die was employed to deliver these liquids to fill up the square cells. The effects of several parameters such as coating thickness and coating speed were examined. Operating windows inside which the stable filling is possible could be found for these liquids. Several defects were observed outside the operating windows. A flow visualization technique was applied to observe the fluid motion in the coating bead region, particularly the movements of upstream and downstream menisci, the mechanism of liquid filling was discussed.