Active matrix substrate, display device, and organic EL display device

An analog gradation-driving active matrix substrate, comprising:

• pixels each including a current-driven light-emitting element and a drive transistor,
• the current-driven light-emitting element has a pixel electrode electrically coupled with the drive transistor,
• the drive transistor supplies a current to the current-driven light-emitting element through the pixel electrode,
• wherein an adjusting transistor for adjusting a voltage of the pixel electrode is electrically connected to a path for the electric current supplied from the drive transistor to the current-driven light-emitting element;
• and
• a first signal line to which a source electrode or a drain electrode of the adjusting transistor is electrically connected is different from a second signal line to which a source electrode or a drain electrode of the drive transistor is electrically connected,
• wherein a first voltage of the first signal line is lower than a second voltage of the second signal line by a threshold voltage of the drive transistor,
• the first voltage is applied to the source electrode or the drain electrode of the adjusting transistor, and
• the second voltage is applied to the source electrode or the drain electrode of the drive transistor.