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URN etd-0818109-151225 Statistics This thesis had been viewed 2647 times. Download 1522 times. Author Chih-Ming Ho Author's Email Address No Public. Department Electro-Optical Engineering Year 2008 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 83 Title Fabrication of High Contrast Light Valves Based On Electrowetting of The Liquid Metal Keyword high contrast ratio contact angle liquid metal liquid metal contact angle high contrast ratio Abstract Fabrication of high contrast light valve based on electrowetting of liquid metal is demonstrated. We have used gallium which is a liquid metal and transparent conductive solution to replace the water and oil droplet for conventional electrowetting display. Light valve structure consisted of liquid metal (eg. Ga)/transparent conductive solution (eg. H2SO4) was fabricated on an optically transparent substrate. At zero voltage, the initial contact angle of the gallium droplet on interface surface is 130 . When apply a dc voltage, the contact angle of the gallium droplet to the glass substrate can be decreased to as low as 10 with very high reversibility. The liquid metal was extended as the thin film on substrate surface. Operating low voltage is actuated of gallium form retract to expend. The phenomenon lead us to complete a light valve. When the liquid metal retracted, the backlight source provided light transmissions through the light valve module. When the liquid metal is expanded as the thin film, back-light reflected by such a soft metal film. As a result, the high contrast ratio of the formation can be observed. Furthermore, the operation speed of such light valve can achieve to video-speed switching.
We also proceed to minimize the dimensions of the light valve to conventional display pixel size. It shows that such prototype has high contrast ratio.
Advisor Committee Tasung-Hui Tsai - advisor
Fu-Cheng Wang - co-chair
Wen-Ching Shih - co-chair
Files Date of Defense 2009-07-16 Date of Submission 2009-08-18