An optical interactive panel includes a cladding layer, a first waveguide array, a second waveguide array, a first set of image sensor, and a second set of image sensor. After a gate electrode is formed, impurity is implanted on the surface of an oxide film, thereby changing surface characteristics of the oxide film to scatter ultraviolet rays which are factors of degradation of the gate insulating film. The extension of the unbonded region is a measure of the strength of the wafer connection and is electrically determined by staggered contacts that, with the formation of the bond connection, close, only in part, via a contact strip. % of starch, said vegetable material being ground to particles of a suspendable size, in a mass subjected to a thermal molding step under pressure, for effecting a faster and more homogeneous gelatinization.