Abstract
Transmissive electrowetting display pixels are reported with ~1000:1 contrast
ratio and >50% optical transmission. This high performance is enabled by improved
optical density of a black oil layer, and through use of an integrated metal
reflector. The integrated metal reflector is placed such that black-oil motion
self-aligns with the reflector, ensuring optimal operation of the pixel structure.
The integrated reflector can also serve as a storage capacitor during active-matrix
addressing. The pixels utilize new black SU-8 for the hydrophilic grid, which
allows high contrast ratio in bright lighting. These high contrast electrowetting
display pixels are increasingly compelling for high efficiency transmissive
displays, and it is theoretically predicted that >80% transmission, <20 ms
switching speed, and >1000:1 contrast ratio can be simultaneously achieved with optimized design.
© 2011 IEEE
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