Transparent display is currently an interesting topic in the display technologies for mobile device, monitor, shopping window or smart window application. This paper described the large area (14 inch) transparent electrowetting display (EWD) by using twolayer hydrophilic rib structure and manufacturing process is proposed as well. This work included two parts: structure and process development of large area transparent electrowetting display and the implementation of two-layer hydrophilic rib structure and plasma treatment in the manufacturing process for electrowetting display. The two-layer structure material and plasma treatment is implemented to modify the manufacturing process and improve the panel performance. The development of this study realized the concept of transparent electrowetting display with large size display area.

This study reports the synthesis and characterization of nonstoichiometric nanocrystalline Co2.59W0.41O4 thin film by the radio frequency (RF)‐sputter technique suitable for photosensor applications. The photoconductive characteristics of Co2.59W0.41O4 thin film are investigated by fabricating a sandwich‐structure device of p+Si/Co2.59W0.41O4 thin film/indium tin oxide with Schottky barriers. The device characteristics including responsivity, light intensity response, and time response are studied. It is found that Co2.59W0.41O4 thin film exhibits good absorption (absorption coefficient ≈104 cm−1 in visible light spectrum), relatively high responsivity (Rres = 5.427 A W−1), and fast photoresponse time including rise time (tr) = 81.04 ms and fall time (tf) = 80.67 ms. Hence, the Co2.59W0.41O4 thin film is favorable for potential photosensor applications.

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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.