Active matrix display device

A display device comprising:

• a display panel;
• and
• a display driving circuit including a shift register formed on the display panel, the shift register including a connection of a plurality of stages;
• a first stage thereof including a first transistor and a second transistor;
• a second stage thereof including a third transistor and a fourth transistor;
• the first transistor including a control electrode, an input electrode and an output electrode;
• a first pulse line connecting to the input electrode of the first transistor;
• the third transistor including a control electrode, an input electrode and an output electrode;
• a second pulse line connecting to the input electrode of the third transistor;
• and
• an input pulse signal line connecting the first stage and the second stage,
• wherein the output electrode of the first transistor connects to the control electrode of the third transistor,
• a voltage of the control electrode of the first transistor is changed by a voltage of the first pulse line changing,
• the second transistor connects the control electrode of the first transistor and a constant voltage line when the second transistor is an on state,
• a voltage of the control electrode of the third transistor is changed by a voltage of the second pulse line changing,
• the fourth transistor connects the control electrode of the third transistor and the constant voltage line when the fourth transistor is an on state,
• the fourth transistor is switched to an off state by a signal from the first stage, and
• the control electrode of the first and the third transistor are connected to the constant voltage line by an input pulse signal of the input pulse signal line.