Patent ID: 7365562

Claim:
A display device comprising: a plurality of first display signal lines; a plurality second display signal lines crossing the first display signal lines; a plurality of pixels each respectively connected to one of the first display signal lines and one of the second display signal lines; a plurality of first sensing signal lines, each respectively formed substantially parallel to a subset of the first display signal lines, each subset of first display signal lines forming a first display signal group; a plurality of second sensing signal lines, each respectively formed substantially parallel to a subset of the second display signal lines, each subset of second display signal lines forming a second display signal group; a plurality of first sensing units connected to the first sensing signal lines; a plurality of second sensing units connected to the second sensing signal lines; a plurality of first test circuits, each respectively connected to one of the first sensing signal lines and a corresponding one of the first display signal groups, the first test circuits supplied with first and second test signals, the first test circuits testing a state of the first sensing units by changing luminance of the pixels according to the state of the first sensing units; and a plurality of second test circuits, each respectively connected to one of the second sensing signal lines and a corresponding one of the second display signal groups, the second test circuits supplied with third and fourth test signals, the second test circuits testing a state of the second sensing units by determining whether or not the pixels will operate according to the state of the second sensing units.