Patent ID: 6891532

Claim:
A picture element inspecting apparatus for an active matrix type display board, for determining the quality of picture elements of a device to be inspected that is the active matrix type display board in which the picture elements are arranged at the respective intersecting portions of a plurality of column select lines and a plurality of row select lines into a matrix shape and the picture elements can be driven by a horizontal driving circuit and a vertical driving circuit, wherein a subtraction operation is performed on effective picture element data obtained as a discharge waveform from said picture elements by electrically charging said picture elements of said device to be inspected using said horizontal driving circuit and said vertical driving circuit, and correction picture element data obtained from said picture elements in a state where either said row select lines or said column select lines of the picture elements are not selected after acquiring said effective picture element data, and the quality of said picture elements is determined based on this subtraction output thus obtained.