Display device and method for driving thereof

A driving method of a display device comprising steps of:

• receiving a driving frequency of a display device;
• receiving a required luminance representing a brightness of a screen of the display device;
• determining a light emission cycle of a light emission control signal output to the pixel unit according to the driving frequency and the required luminance, and
• determining an off duty ratio of the light emission control signal according to the required luminance,
• wherein the determining the light emission cycle of the light emission control signal is accomplished by
• comparing the driving frequency with a reference frequency,
• comparing the required luminance with a reference luminance, and
• determining the light emission cycle,
• wherein the determining the light emission cycle derives the light emission cycle by using a look-up table,
• the look-up table includes information for a minimum light emission cycle in which a complex flicker index is less than 1 according to the driving frequency, the required luminance, and the off duty ratio,
• the complex flicker index is a numerical value indicating an occurrence degree of a flicker phenomenon, and is a value reflecting sensitivity to the frequency component after extracting an optical waveform and converting it into a frequency component,
• when the driving frequency and the light emission cycle are fixed, and when a same the required luminance appears, the complex flicker index decreases as the off duty ratio decreases, and
• when the driving frequency is 90 Hz and the required luminance is 400 nits or more,
• if the off duty ratio is 50% or less, there is one light emission cycle, and
• if the off duty ratio is more than 50%, there are six light emission cycles.