Variable frequency display device

A display device comprising:

• a pixel which is connected to a first scan line, a second scan line, and a data line, and includes a first transistor generating a driving current for a light-emitting element;
• a scan driver which supplies a first scan signal to the first scan line and a second scan signal to the second scan line;
• a controller which divides one frame period into an active period and a blank period and generates a count signal in which a time of the blank period is counted and a power control signal, based on a control signal supplied from outside;
• a data driver which supplies a data signal to the data line;
• and
• a power supply which controls at least one of a reference voltage supplied to a source electrode of the first transistor or a gate level voltage supplied to the scan driver according to a duration of the blank period based on the power control signal,
• wherein when the count signal reaches a reference value, the scan driver outputs the first scan signal in the blank period.

A display device comprising:

• a plurality of pixels, each connected to a power supply line, a data line and a scan line;
• a controller configured to divide each of a plurality of variable frequency frame periods into a respective active period and a respective blank period, determine a duration of at least one of the respective periods, and provide a scan control output, a data control output, and a power control output based on the determined duration;
• a scan driver connected to the scan control output and configured to supply a scan signal to the scan line;
• a data driver connected to the data control output and configured to supply a data signal to the data line;
• and
• a power supply configured to vary at least one variable supply voltage for at least one of the data driver or the scan driver based on the power control output.