Patent ID: 6599783
Filing Date: 2003-07-29
Classification: H01L

Abstract:
A method of producing a liquid crystal display device comprising a pair of substrates jointed to each other with a gap therebetween, a liquid crystal disposed in said gap, pixel electrodes and thin film transistors for driving said pixel electrodes provided on one of said substrates, whereinsaid thin film transistor has a laminated structure comprising a semiconductor thin film, an insulating film provided in contact with the surface of said semiconductor thin film, and a gate electrode disposed on the face side or the back side of said semiconductor thin film, and said thin film transistor is formed on one of said substrates in a predetermined plan view shape by: a first step for forming a semiconductor thin film having a clean surface over a substrate, a second step of forming a protective film so as to cover said clean surface of said semiconductor thin film, a third step of patterning said semiconductor thin film together with said protective film according to said plan view shape of said thin film transistor, said step of patterning including forming a photoresist over said protective film and etching same, a fourth step of removing said protective film from the upper side of said patterned semiconductor thin film to expose said clean surface, and a fifth step of forming an insulating film in contact with said exposed surface of said semiconductor thin film.