Patent ID: 6235546
Filing Date: 2001-05-22
Classification: G02F

Abstract:
A method of forming an active matrix electro-optic display device comprisinga pair of walls, at least one of which is optically transparent, an array of pixel electrodes, an array of switches associated with the pixel electrodes, an array of row and column electrodes interconnecting the array of switches and pixel electrodes, and an array of storage capacitors, each storage capacitor connected to a pixel electrode of the array of pixel electrodes, the arrays arranged on an inner surface of one of the walls, a counter electrode on the inner surface of the other wall, and an electro-optic material filling the space between the walls, the method comprising the steps of:a) forming an array of islands of conductive material,b) forming a layer of a dielectric material on each island of the array of islands,c) forming the array of row electrodes on the array of islands having the dielectric layers, to thereby form the array of storage capacitors,d) forming the array of pixel electrodes so that each pixel is located adjacent to a storage capacitor, ande) electrically connecting each of the islands to an adjacent pixel electrode,in which the switches are TFTs each having a channel region, a source electrode, a drain electrode and a gate electrode, the row electrodes interconnect the TFT gate electrodes, the column electrodes interconnect the TFT source electrodes, and the pixel electrodes are each connected to a TFT drain electrode,in which the electro-optic material is a liquid crystal material, andin which the islands are formed by forming islands of polysilicon and degeneratively doping these islands, thereby to render the islands conductive.