Pixel circuit and display device having the same

A pixel circuit comprising:

• a light emitting element;
• a driving transistor configured to generate a driving current;
• a write transistor including a control electrode configured to receive a write gate signal, a first electrode configured to receive a data voltage, and a second electrode connected to a first electrode of a storage capacitor;
• a first compensation transistor including a control electrode configured to receive a compensation gate signal, a first electrode connected to a control electrode of the driving transistor, and a second electrode connected to a first electrode of the driving transistor;
• the storage capacitor including the first electrode connected to the second electrode of the write transistor, and a second electrode connected to the control electrode of the driving transistor;
• a test transistor including a control electrode, a first electrode configured to receive the data voltage, and a second electrode connected to a second electrode of the driving transistor;
• a first initialization transistor including a control electrode configured to receive an initialization gate signal, a first electrode configured to receive a first initialization voltage, and a second electrode connected to the control electrode of the driving transistor;
• a second compensation transistor including a control electrode configured to receive the compensation gate signal, a first electrode, and a second electrode connected to the first electrode of the storage capacitor;
• a second initialization transistor including a control electrode configured to receive a bias signal, a first electrode configured to receive a second initialization voltage, and a second electrode connected to an anode electrode of the light emitting element;
• a first emission transistor including a control electrode configured to receive a first emission signal, a first electrode connected to the second electrode of the driving transistor, and a second electrode configured to receive a first power voltage;
• a second emission transistor including a control electrode configured to receive a second emission signal, a first electrode connected to the anode electrode of the light emitting element, and a second electrode connected to the first electrode of the driving transistor;
• and
• a hold capacitor including a first electrode connected to the first electrode of the storage capacitor, and a second electrode configured to receive the first power voltage.

A display device comprising:

• a display panel comprising pixel circuits;
• and
• a display panel driver configured to drive the display panel,
• wherein each of the pixel circuits comprises:
• a light emitting element;
• a driving transistor configured to generate a driving current;
• a write transistor including a control electrode configured to receive a write gate signal, a first electrode connected to a data line and configured to receive a data voltage, and a second electrode connected to a first electrode of a storage capacitor;
• a first compensation transistor including a control electrode configured to receive a compensation gate signal, a first electrode connected to a control electrode of the driving transistor, and a second electrode connected to a first electrode of the driving transistor;
• the storage capacitor including the first electrode connected to the second electrode of the write transistor, and a second electrode connected to the control electrode of the driving transistor;
• a test transistor including a control electrode, a first electrode configured to receive the data voltage, and a second electrode connected to a second electrode of the driving transistor;
• and
• a hold capacitor including a first electrode connected to the first electrode of the storage capacitor, and a second electrode configured to receive a first power voltage,
• wherein, in at least an array test period, the test transistor is configured to be turned on concurrently with the write transistor to apply the data voltage to the second electrode of the driving transistor while the write transistor is turned on to connect the first electrode of the storage capacitor to the data line.