Patent ID: 7674635

Claim:
A method of manufacturing a semiconductor device comprising: providing a semiconductor device comprising a plurality of thin film transistors over a substrate; providing a secondary coil over said substrate; providing a waveform shaping circuit and a rectifier circuit over said substrate; keeping an interval between a primary coil and said secondary coil of said substrate; applying a voltage between two terminals of said primary coil; inducing an AC voltage in said secondary coil by electromagnetic induction; rectifying said AC voltage to form pulsating voltages with different phases by said rectifier circuit; forming a driving signal by said waveform shaping circuit and said rectifier circuit from said AC voltage; smoothing said pulsating voltages to be used as a power source voltage after rectifying said AC voltage; supplying said driving signal and said power source voltage to said semiconductor device to drive said semiconductor device; detecting an electric field created by said semiconductor device as a result of supplying said driving signal thereto in order to decide whether said semiconductor device correctly operates or not, and wherein said electric field is measured by using an antenna, wherein each of said pulsating voltages after rectifying said AC voltage, has 0 or a value having one polarity on a semi-period basis, and wherein said pulsating voltages with different phases are combined with each other to generate said power source voltage after rectifying said AC voltage.