Ink drop filling by a slot coating die for an electrowetting display panel |
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Authors: | Kuo‐Lung Lo Chia‐Jen Kao Kai‐Wei Lan Wei‐Yuan Cheng Ta‐Jo Liu |
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Affiliation: | 1. Department of Chemical Engineering, National Tsing Hua University, , Hsinchu, 300 Taiwan;2. Display Technology Center, Industrial Technology Research Institute, , Chutung, Hsinchu, 310 Taiwan |
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Abstract: | 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. |
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Keywords: | electrowetting cell filling slot coating die operating window flow visualization |
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