Display device and method of driving the same

A display device comprising:

• a display panel comprising pulse-amplitude modulation (PAM) data lines, pulse-width modulation (PWM) data lines, and a plurality of sub-pixels respectively connected to the PWM data lines and the PAM data lines;
• a source driver configured to apply PWM data voltages to the PWM data lines;
• a power supply unit configured to apply PAM data voltages to the PAM data lines;
• and
• a digital data converter configured to determine digital video data corresponding to a low gray level region among digital video data, and increase a value of the digital video data corresponding to the low gray level region to output converted digital data.

A method of driving a display device, comprising:

• determining digital video data corresponding to a low gray level region among digital video data;
• outputting modulated digital data by increasing a value of the digital video data of the low gray level region;
• outputting a pulse-width modulation (PAM) control signal corresponding to the low gray level region as a first level voltage and outputting the pulse-width modulation (PAM) control signal corresponding to a high gray level region other than the low gray level region as a second level voltage;
• generating PWM data voltages according to the modulated digital video data and outputting the PWM data voltages to PWM data lines;
• and
• outputting PAM data voltages to PAM data lines according to the PAM control signal.

A display device comprising a plurality of sub-pixels, each sub-pixel comprising:

• a light emitting element;
• a first pixel driver configured to supply a control current to a first node according to a pulse-width modulation (PWM) data voltage received from a first data line;
• a second pixel driver configured to generate a driving current according to a pulse-amplitude modulation (PAM) data voltage received from a second other data line;
• and
• a third pixel driver configured to adjust a period during which the driving current is supplied to the light emitting element according to a voltage of the first node,
• wherein a peak current value of the driving current when the light-emitting element emits light for image data having a gray level between a first level and a second level is smaller than a peak current value of the driving current when the light-emitting element emits light for image data having a gray level region between the second level and a third level higher than the first level.