Method of manufacturing optical device and inspection gauge used for the same

摘要

A rectangular transparent sheet 15 is printed with black dotted density patterns 21 and 22. Each dot of the patterns 21 and 22 is 30 mum in size while dotted area occupied rates of the patterns 21 and 22 range from 3% to 45%. The density patterns 21 and 22 are used for density level assessment of unevenness on a flat panel display device as standard references. Such density level assessment is carried out by comparing the unevenness with the patterns 21 and 22 or by visual inspection with the latter placed on the former.