A power source line 1 and a scanning line 3 are arranged on different
wiring layers so as to be orthogonal to each other. In the wiring layer
on which the scanning line 3 is arranged, a bypass line 111 is arranged
on at least a part of a portion obtained by removing a planar position of
the scanning line 3 from a planar position of the power source line 1.
Contacts 121 and 122 establish electric connection between the power
source line 1 and the bypass line 111. As described above, the bypass
line 111 is connected to the power source line 1 in parallel, leading to
decrease in resistance of the power source line 1 and suppression of
unevenness in brightness at a display screen. Moreover, an additional
manufacturing step for providing the bypass line 111 is unnecessary.
Further, an aperture ratio is not reduced even when the bypass line 111
is provided. When the bypass line 111 is made wider than the power source
line 1, a pixel circuit can be prevented from operating erroneously due
to external light.