Patent ID: 6348702
Filing Date: 2002-02-19
Classification: H01L

Abstract:
An image display system having a plurality of thin film image display elements for light emission, each of said display elements being cyclically energized by a D.C. power source sequentially, comprising;a bias thin film transistor coupled between an image display element and a D.C. power source for flowing current into said image display element according to image data to be displayed, said transistor having a source, a drain and a gate, being formed on a substrate, an active layer of said bias thin film transistor being formed by poly-crystalline silicon located on said substrate, said gate located on said active layer length and width of said gate on said active layer of said bias thin film transistor being at least 10 times as large as average diameter of crystal grain of poly-crystalline silicon which forms said active layer thereby increasing gate capacitance wherein said gate capacitance of said bias thin film transistor holds a gate voltage until energization of the transistor in next cycle eliminating the need for a gate capacitor; and an organic element expanded in size taking the space previously occupied by said gate capacitor which will result in improved operational reliability.