EFFECT OF SURFACE ROUGHNESS ON THE FABRICATION OF ELECTROWETTING DISPLAY CELLS AND ITS ELECTRO-OPTIC SWITCHING BEHAVIOR

Palanivelu Sureshkumar, Miyoung Kim, Eun Gyoung Song, Young Jin Lim and Seung Hee Lee ()
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Palanivelu Sureshkumar: Polymer Fusion Research Center, Department of Polymer Nano-Science and Technology, Chonbuk National University, Chonju, Chonbuk 561-756, Korea
Miyoung Kim: Polymer Fusion Research Center, Department of Polymer Nano-Science and Technology, Chonbuk National University, Chonju, Chonbuk 561-756, Korea
Eun Gyoung Song: Polymer Fusion Research Center, Department of Polymer Nano-Science and Technology, Chonbuk National University, Chonju, Chonbuk 561-756, Korea
Young Jin Lim: Polymer Fusion Research Center, Department of Polymer Nano-Science and Technology, Chonbuk National University, Chonju, Chonbuk 561-756, Korea
Seung Hee Lee: Polymer Fusion Research Center, Department of Polymer Nano-Science and Technology, Chonbuk National University, Chonju, Chonbuk 561-756, Korea

Surface Review and Letters (SRL), 2009, vol. 16, issue 01, 23-28

Abstract: Electrowetting is a new class of reflective display based on electric field controlled movement of oil/water interface across a hydrophobic layer. The focus of this paper is to fabricate electrowetting cells on a rough hydrophobic surface and to study its effect on kinetics of electrowetting. The surface roughening found effective in two ways in the design and operation of the electrowetting device: (i) It enhances the coating of photoresist (PR) on the hydrophobic surface, which is normally difficult due to low surface energy of Teflon and (ii) the roughness changes the contact angle of the liquid (oil), which in turn changes the electro-optic switching behavior of the device. The kinetics of optical switch was checked by calculating theoretically the white area fraction (WA%), which is a measure of optical switching in electrowetting display by changing the roughness of the hydrophobic surface. The present study showed that the optical performance found to increase with the increase of roughness of the hydrophobic surface.

Keywords: Electrowetting; display device and electro-optics (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X0901224X

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