Patent ID: 8558829

Claim:
An organic light emitting display (OLED) device, comprising: an estimated current calculation unit configured to determine an increase estimated current value having at least one increased gray level and a decrease estimated current value having at least one decreased gray level with respect to current flowing cross an element; a current measurement unit configured to measure the current flowing across the element to provide a measured current value; and a luminance adjustment unit configured to compare the values supplied from the estimated current calculation unit and the current measurement unit and increase the luminance when the value inputted through the estimated current calculation unit is high and decrease the luminance when the value inputted through the estimated current calculation unit is low, wherein the estimated current calculation unit comprises: red, green, and blue current adding units configured to provide an increment and a decrement of each of current values flowing across red, green, and blue elements, an increased current adding unit configured to add the increments inputted from the red, green, and blue current adding units to obtain the increase estimated current value, and a decreased current adding unit configured to add the decrements inputted from the red, green, and blue current adding units to obtain the decrease estimated current value, wherein the red, green, and blue current adding units add up the current values during the at least one frame by using a synchronous signal supplied from a timing driving unit and outputs the increment and the decrement to the non-display interval, wherein the estimated current calculation unit further comprises: an estimation unit configured to determine the current flowing across the element; and a look-up table unit configured to obtain the increase estimated current value and the decrease estimated current value according to the estimated current value provided by the estimation unit, and wherein the look-up table unit comprises: an increase estimated current data comprising the respective increments with respect to the current values flowing across the red, green, and blue elements to allow for obtaining the increase estimated current value according to the estimated current value provided by the estimation unit, and a decrease estimated current data comprising the respective decrements with respect to the current values flowing across the red, green, and blue elements to allow for obtaining the decrease estimated current value according to the estimated current value provided by the estimation unit.