Driving Circuit and Display Device Using the Same

A display device comprising:

• a display driving circuit which changes a refresh rate in units of a frame in accordance with an image, distinguishes the frame into a refresh frame for writing a data voltage and a hold frame for maintaining the data voltage written in the refresh frame, generates a count value in units of the refresh frame and the hold frame in accordance with the refresh rate, and outputs a comparison value such that a bias voltage is varied or a pulse width of a light emission signal is varied according to the count value;
• a first register unit which comprises a plurality of registers, the plurality of registers storing adjusted bias voltage values with different levels, respectively;
• a digital-to-analog converter which converts the adjusted bias voltage values selected according to the comparison value into an analog voltage and outputs the analog voltage;
• a second register unit which comprises a plurality of registers, the plurality of registers storing different light emission signal values, respectively;
• a light emission control signal generator which generates a light emission control signal based on the light emission signal value selected depending on the comparison value;
• and
• a light emission signal driver which operates such that the pulse width of the light emission signal is varied according to the light emission control signal.