Patent ID: 7561131
Filing Date: 2009-07-14
Classification: G02B,G09G

Abstract:
1. A display unit comprising at least one electro-wetting pixel, each electro-wetting pixel comprising: a closed cell; a polar liquid and a non-polar liquid, said liquids being immiscible, having different optical properties and being contained in said cell; a counter electrode; and at least one electrode pair, each electrode pair comprising an address electrode and a retain electrode, said address and retain electrodes being separated from said liquids by a surface that is lyophobic in relation to only one of said liquids; and wherein said address and retain electrodes are arranged at respective electric potentials to control a spatial distribution of said liquids and thereby defining a multi-stable pixel state, and wherein a current state is retained by applying a potential to the retain electrode in relation to the counter electrode and removing any potential from the address electrode in relation to the counter electrode.