Patent ID: 6843904

Claim:
An in-substrate selective electrochemical treatment system for finding and repairing pinholes in an active substrate comprising: holding means for holding an insulating substrate; an electrode for connection at a periphery of an insulating substrate being held by the holding means, to a conductive pattern located on such an insulating substrate, said electrode being covered with an insulating layer; chemical solution confining means for confining a chemical solution to only a specified region on an insulating substrate, the specified region being smaller than an insulating substrate or slightly larger than an image displaying section on an active substrate formed on an insulating substrate; a reversed polarity electrode plate for applying an electric charge to the chemical solution, the electric charge having polarity opposite to an electric charge of said electrode; chemical solution supplying and discharging means for supplying and discharging the chemical solution to and from an insulating substrate; and means for detecting at least one pinhole in said insulating layer comprising means for measuring the value of a current flowing between said electrode and said reversed polarity electrode plates.