Patent ID: 6833715
Filing Date: 2004-12-21
Classification: G09G,G11C

Abstract:
A semiconductor testing apparatus which tests the gradation output voltage characteristics of a semiconductor integrated circuit for outputting a gradation output voltage through each of a plurality of output terminals and which comprises plural pieces of output voltage testing means each corresponding to each of said output terminals, wherein said output voltage testing means comprises:test voltage inputting means for inputting a voltage to be tested which is obtained from a gradation output voltage; comparison voltage generating means for generating a comparison voltage to be compared with the voltage to be tested, on the basis of comparison voltage generation data provided from comparison voltage generation data inputting means; and comparing means for comparing the voltage to be tested with the comparison voltage; and wherein said comparison voltage generation data is generated by adding common comparison voltage generation data shared with the other pieces of output voltage testing means to individual comparison voltage generation data provided for each piece of output voltage testing means in order to correct an intrinsic error in each piece of comparing means.