Patent ID: 7205986

Claim:
An image display device comprising: a plurality of pixels which are arranged in matrix; a plurality of data signal lines; a plurality of scanning lines; a first driver circuit which controls the data signal lines; a second driver circuit which controls the scanning lines; and a testing circuit comprising an input portion, an output portion, and a portion wherein a plurality of NAND circuits is connected in series so that an output of one of the plurality of NAND circuits is directly connected to an adjacent one of the plurality of NAND circuits; wherein each of the plurality of data signal lines is connected to each of input portions of the plurality of NAND circuits, wherein a number of the plurality of data signal lines is equal to a number of the plurality of NAND circuits, wherein the output portion of the testing circuit is connected to a testing terminal and the input portion of the testing circuit is connected to a power source, and wherein the first driver circuit and the plurality of pixels are connected to the testing circuit through the data signal line.