Patent ID: 6468839
Filing Date: 2002-10-22
Classification: G02F,H01L

Abstract:
A method for producing a thin film semiconductor device comprising a display part and a peripheral drive circuit part integrally formed on a glass substrate, comprising the steps of:forming gate electrodes on the glass substrate; forming an insulating film on the gate electrodes; forming a semiconductor thin film on the insulating film on the gate electrodes; performing laser annealing on the semiconductor thin film to transform the semiconductor thin film into a polycrystalline semiconductor layer; selectively forming a low concentration impurity layer on the polycrystalline semiconductor layer in the display part; and forming a high concentration impurity layer to constitute source and drain regions on the low concentration impurity layer in the display part, thereby forming a thin film transistor for switching having an LDD structure in the display part, and forming a high concentration impurity layer to constitute source and drain regions on the polycrystalline semiconductor layer in the peripheral drive circuit part, thereby forming thin film transistors in the drive circuit part.