In the following description, details (a configuration, effects, etc.) which are the same as those of the above-described embodiments may be omitted.
Referring to 
The data line 410 and the reference voltage line 420 may be disposed in the same layer and formed of the same material.
The fourth electrode 411 including a region branching from the data line 410 may be used as the source electrode or the drain electrode of the first transistor T1. The fifth electrode 521 including a region branching from the reference voltage line 420 may be used as the source electrode or the drain electrode of the second transistor T2.
Subsequently, referring to 
The first conductive layer 450 may be disposed on the first insulating layer 401.
A part of the first conductive layer 450 may overlap a part of the data line 410 and a part of the reference voltage line 420.
When, as shown in