Abstract
A reflector technique for increasing the transmission performance of a back-lit
electrowetting display is presented. The electrowetting display pixel structure consists
of an opaque oil film that blocks light transmission. Electrowetting with $\sim
{\hbox{5}}\hbox{--}{\hbox{10\ V}}$ breaks up the oil film and creates a transmissive
area for the pixel. With real-world electrowetting materials and device constraints, the
transmissive area typically reaches 60% to 80% of the pixel area. By integrating a
simple thin-film reflector between the backlight and the remaining oil film area, the
effective transmission can be boosted to $> {\hbox{90}}\%$. This high efficiency
is promising for battery-powered applications and for high-brightness sunlight-legible
displays.
© 2008 IEEE
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