Display Device
A display device having a display element is configured such that the extending directions of electrodes are made different from each other among upper, lower, left and right pixels.
1 . A display device including;
a display panel,
a tape carrier having a driver circuit, and
a printed circuit board,
a signal from the printed circuit board is transmitted to the display panel through the driver circuit on the tape carrier, wherein
at least two first connecting portions connect between terminals on the printed circuit board and terminals on the tape carrier,
at least three second connecting portions connect between terminals on the opposite side of the tape carrier and terminals on the display panel,
a plurality of connecting line on the tape carrier connect between the first connecting portion and the second connecting portion without the driver circuit,
a plurality of measuring terminal formed on the printed circuit board, the measuring terminal are connected to the second connecting portion, and
a connection resistance either at the first connecting portion and the second connecting portion are measured at the measuring terminal.
2 . A display device according to claim 1 , wherein
the measuring terminals are formed at least four terminals, Constant current is supplied between two measurement terminals, and a voltage difference is measured between two other terminals
3 . A display device according to claim 1 , wherein
the first connecting portion and the second connecting portion is connected by way of an anisotropic conductive film.
4 . A display device according to claim 1 , wherein
a common electric potential bus formed on the display panel,
the first connecting portion is connected to the common electric potential bus.
5 . A display device according to claim 4 , wherein
a common electric potential line formed on the printed circuit board,
the common electric potential line is connected to one of the measuring terminals, the common electric potential line is connected to the common electric potential bus on the display panel electrically.
6 . A display device according to claim 1 , wherein
at least one of the connecting lines on the tape carrier has branching portion on the tape carrier.