Patent ID: 6559477
Filing Date: 2003-05-06
Classification: G02F,H01L

Abstract:
A flat panel display device comprising:a thin film semiconductor switching element formed on a surface of a substrate; a display electrode connected with said switching element; a semiconductor layer for auxiliary capacity which is electrically connected with said display electrode; a dielectric layer formed on a surface of said semiconductor layer for auxiliary capacity; and a metal layer formed on a surface of said dielectric layer; wherein the auxiliary capacity is constituted by the semiconductor layer for auxiliary capacity, the dielectric layer, and the metal layer; and said switching element includes a channel region, and a semiconductor layer having source and drain regions disposed to sandwich the channel region therebetween and implanted respectively with an n-type or p-type impurity ion, the impurity ion having the same as the impurity ion concentration being implanted into the source/drain regions is implanted into the semiconductor layer for auxiliary capacity in the same step, a surface concentration of the n-type or p-type impurity ion is in the range of 3.2Ã—1019 to 2.0Ã—1020 atoms/cm3.