Patent ID: 7335261

Claim:
Apparatus for forming a semiconductor thin film of the class wherein a non-single crystal semiconductor layer is formed on a base layer made of an insulating material; said non-single crystal semiconductor layer is irradiated by light; and said light is relatively moved to said base layer, thereby crystallizing said non-single crystal semiconductor layer, the apparatus comprising: a light source emitting said light; a homogenizer for homogenizing the intensity distribution of said light emitted from said light source; an amplitude-modulation means for performing the amplitude modulation such that the amplitude of said light of which the intensity distribution is homogenized, is increased in the direction of the relative motion of said light to said base layer; a light projection optical system for projecting the light that is amplitude-modulated by said amplitude-modulation means on said non-single crystal semiconductor layer formed on said base layer; means for providing a low temperature point in the surface irradiated by said light; and means for relatively moving said light to said base layer.