Patent ID: 7129124

Claim:
A process of fabricating a display device for obtaining an active matrix substrate for use in a display device by placing an insulating substrate with an amorphous semiconductor film or a granular polycrystalline semiconductor film formed on the top surface thereof on a stage, irradiating laser light to a plurality of regions on the amorphous semiconductor film or the granular polycrystalline semiconductor film on the insulating substrate so as to be annealed, reforming the amorphous semiconductor film or the granular polycrystalline semiconductor film into polycrystalline semiconductor film containing band shape crystal grains, said process comprising the steps of: using continuous-wave laser light condensed into linear or rectangular form as the laser light; continuously shifting the insulating substrate in a shifting direction transverse to the longitudinal direction of the linear form or the rectangular form of the laser light; detecting a location of the insulating substrate relative to an irradiation position of the laser light for every shift of the insulating substrate of a predetermined distance in the shifting direction; and repeating an operation of starting irradiation of the continuous-wave laser light at a time when respective regions of the insulating substrate to be irradiated with the laser light reach the irradiation position of the laser light, and then stopping irradiation of the continuous-wave laser light at a time when the respective regions of the insulating substrate to be irradiated with the laser light pass the irradiation position of the laser light; wherein a repeating operation of starting and stopping irradiation of the continuous-wave laser light is effected in accordance with the detection of the location of the insulating substrate; and thereby discontinuously forming the band shape crystal grains of the polycrystalline semiconductor film as reformed in relation to the shifting direction of the insulating substrate.