Patent ID: 9070322
Filing Date: 2015-06-30
Classification: G02B,G09G,Y10T

Abstract:
1. A display apparatus comprising a circuit board having row and column electrodes arranged thereon to connect a driver to a plurality of electrofluidic chromatophore (EFC) pixel cells provided on the circuit board, wherein each pixel cell comprises: a fluid holder for holding a polar fluid and a non-polar fluid having differing display properties; wherein the fluid holder comprises a reservoir having an orifice with a small visible area projected in the direction of a viewer, and wherein the fluid holder further comprises a channel with a geometry having a large visible area projected in the direction of a viewer, the channel being connected to the reservoir via said orifice so as to enable free movement of the polar fluid and non-polar fluid between the channel and the reservoir, at least part of a surface of the channel comprising a wetting property and at least two pixel cell terminals connectable to the row and column electrodes on the circuit board and being configured to supply a supply voltage to at least part of the surface of the channel comprising the wetting property for supply voltage controlled movement of polar fluid; the at least two pixel cell terminals dielectrically separated from the polar fluid; wherein the reservoir is formed in a stacked structure of homogenous film layers arranged on the circuit board, the structure at least comprising an orifice film layer and a reservoir film layer, wherein the reservoir arranged in the reservoir layer is obscured in the direction of a viewer by the orifice film layer, said orifice film layer defining a smallest orifice area that is smaller than a cross sectional area formed in the reservoir film layer; and wherein the reservoir stack structure includes a reservoir layer forming a reservoir with a reservoir height ranging between 15-50 micrometer, and an orifice layer with a thickness ranging between 1 and 15 micrometer.