Electroluminescent display device for minimizing a voltage drop and improving image quality and driving method thereof

An electroluminescence display device comprising:

• a display panel having a display area where images are displayed and a non-display area where images are not displayed;
• a subpixel located in the display area;
• a gate driver located in the non-display area;
• and
• a voltage transfer transistor that is in the non-display area and transfers a reference voltage to the subpixel,
• wherein a gate of the voltage transfer transistor is connected to the gate driver,
• wherein the gate driver comprises:
• a pull-up transistor;
• and
• a first boosting capacitor connected to a gate of the pull-up transistor, and a drain of the pull-up transistor,
• wherein the gate of the voltage transfer transistor is connected to the gate of the pull-up transistor, and
• wherein the subpixel further comprises:
• a first transistor that has a gate connected to an nth scan line, a first electrode connected to a first data line, and a second electrode connected to the first electrode of a driving transistor;
• a second transistor that has a gate connected to an nth emission control signal line, a first electrode connected to a second electrode of the first transistor, and a second electrode connected to a first power supply line;
• a third transistor that has a gate connected to the nth scan line, a first electrode connected to a second electrode of the driving transistor, and a second electrode connected to the gate of the driving transistor;
• a fourth transistor that has a gate connected to an (n−1)th scan line, a first electrode connected to an initial line, and a second electrode connected to the second electrode of the third transistor and the gate of the driving transistor, where n is an integer equal to or greater than 2;
• a fifth transistor that has a gate connected to the nth emission control signal line and a first electrode connected to the second electrode of the driving transistor;
• a sixth transistor that has a gate connected to the nth scan line, a first electrode connected to the initial line, and a second electrode connected to a second electrode of the fifth transistor;
• and
• a seventh transistor that has a gate connected to the nth emission control signal line, a first electrode connected to the first power supply line, and a second electrode connected to the voltage transfer node.

A driving method of an electroluminescence display device,

• the electroluminescence display device including a display panel having a display area where images are displayed and a non-display area where images are not displayed;
• a subpixel located in the display area;
• and a gate driver and a voltage transfer circuit that are located in the non-display area, wherein the voltage transfer circuit transfers a reference voltage to the subpixel, the method comprising:
• initializing the subpixel in an initial period;
• and
• compensating for the threshold voltage of a driving transistor of the subpixel in a sampling period,
• wherein, during the initializing period and the sampling period, the voltage transfer circuit operates in response to a signal applied from outside the display panel or a signal generated on the display panel,
• wherein the reference voltage is a fixed voltage during the initializing period and the sampling period, and
• wherein the subpixel further comprises:
• a first transistor that has a gate connected to an nth scan line, a first electrode connected to a first data line, and a second electrode connected to the first electrode of the driving transistor;
• a second transistor that has a gate connected to an nth emission control signal line, a first electrode connected to a second electrode of the first transistor, and a second electrode connected to a first power supply line;
• a third transistor that has a gate connected to the nth scan line, a first electrode connected to a second electrode of the driving transistor, and a second electrode connected to the gate of the driving transistor;
• a fourth transistor that has a gate connected to an (n−1)th scan line, a first electrode connected to an initial line, and a second electrode connected to the second electrode of the third transistor and the gate of the driving transistor, where n is an integer equal to or greater than 2;
• a fifth transistor that has a gate connected to the nth emission control signal line, a first electrode connected to the second electrode of the driving transistor, and a second electrode connected to the anode of the organic light-emitting diode;
• a sixth transistor that has a gate connected to the nth scan line, a first electrode connected to the initial line, and a second electrode connected to a second electrode of the fifth transistor;
• and
• a seventh transistor that has a gate connected to the nth emission control signal line, a first electrode connected to the first power supply line, and a second electrode connected to the voltage transfer node.