Patent ID: 6509212
Filing Date: 2003-01-21
Classification: G02F,H01L,Y10S

Abstract:
A method of manufacturing a display device having an active matrix circuit and a driver circuit both formed over a same substrate, said driver circuit including at least one CMOS device comprising an N-channel type thin film transistor and a P-channel type thin film transistor, said method comprising the steps of:forming a semiconductor film comprising amorphous silicon over said substrate; crystallizing said semiconductor film by heating; irradiating said semiconductor film with a laser light after said crystallizing step wherein an irradiation area of said laser light on said semiconductor film is elongated in one direction; etching the crystallized semiconductor film after the irradiating step into at least one semiconductor island; and introducing an N-type impurity into portions of said semiconductor island to form source and drain regions and at least one lightly doped region for said N-channel type thin film transistor, wherein said P-channel type thin film transistor has no lightly doped region.