Patent ID: 7087469
Filing Date: 2006-08-08
Classification: G02F,H01L

Abstract:
1. A method of controlling a capacitance of a TFT-LCD storage capacitor, comprising: forming a silicon island and a bottom electrode on the transparent substrate, the silicon island having an undoped region located on the central portion, and two doped regions respectively located on both sides; forming a first silicon nitride layer on the silicon island, the bottom electrode and the transparent substrate; forming a dielectric layer on the first silicon nitride layer; forming a stacked layer comprising a second silicon nitride layer and a conductive layer on the dielectric layer above the undoped region of the silicon island, and the conductive layer of the stacked layer serving as a gate of a thin film transistor, wherein an etching selectivity ratio of the conductive layer over the dielectric layer is not less than about 5.0; forming a passivation layer over the stacked layer and the dielectric layer; forming a contact window in the passivation layer, the dielectric layer and the first silicon nitride layer to expose one doped region of the silicon island; and forming a pixel electrode on the passivation layer and in the contact window, and an overlap between the pixel electrode and the bottom electrode forming a storage capacitor.