Patent ID: 8518763

Claim:
A thin-film transistor device manufacturing method, comprising: providing a substrate; forming a plurality of gate electrodes above the substrate; forming an insulation layer on the plurality of gate electrodes; forming an amorphous silicon layer on the insulation layer; crystallizing the amorphous silicon layer using laser light emitted from a predetermined laser of at least 405 nm and at most 488 nm in wavelength while moving the predetermined laser in a direction relative to the substrate, to produce a crystalline silicon layer; and forming a source electrode and a drain electrode on the crystalline silicon layer in a region that corresponds to each of the plurality of gate electrodes, wherein a film thickness of the insulation layer and a film thickness of the amorphous silicon layer define a value X and a value Y, the value X is obtained by dividing an optical film thickness of the amorphous silicon layer by a wavelength of the laser light, the optical film thickness of the amorphous silicon layer being a product of multiplying the film thickness of the amorphous silicon layer and a refractive index of the amorphous silicon layer, the value Y is obtained by dividing an optical film thickness of the insulation layer by the wavelength of the laser light, the optical film thickness of the insulation layer being a result of multiplying the film thickness of the insulation layer by a refractive index of the insulation layer, and the value X and the value Y satisfy: Y≦− 0.5634 X +(0.8357+27.083 ×ΔA ′); Y≦ 0.5634 X +(0.2363+27.083 ×ΔA ′); Y≧− 0.548 X +(0.6545−29.167 ×ΔA ′);and Y≧ 0.548 X +(0.0715−29.167 ×ΔA ′),and ΔA′ is calculated according to an expression of: ( A G /d G )×(ρ Si ×c Si )/(ρ G ×c G ), where ρ Si is a density of the amorphous silicon layer, c Si is a specific heat of the amorphous silicon layer, d G is a film thickness of the gate electrode, ρ G is a density of the gate electrode, c G is a specific heat of the gate electrode, and A G is a maximum absorptance of the gate electrode when a first part of the amorphous silicon layer located above the gate electrode and a second part of the amorphous silicon layer not located above the gate electrode have an equal light absorptance for the laser light.