Patent ID: 7862960

Claim:
A gray-tone mask blank, to which a wet etching is applied, for manufacturing a liquid crystal display device comprising: a transparent substrate, a semitransparent film formed on said transparent substrate, and an opaque film formed on said semitransparent film, said semitransparent film containing molybdenum and silicon, the ratio (molybdenum:silicon) of molybdenum and silicon contained in the semitransparent film being 1:2 to 1:19, transmittance of said semitransparent film being adjusted to 10% to 80% with respect to exposure wavelength of g-line, h-line, and i-line, and said opaque film being made of a material containing chromium and nitrogen, and the content of the nitrogen contained in said opaque film being set to 10% to 80 at %.