Organic light emitting display device

A panel driver for driving a display panel in a sensing mode and a display mode, comprising:

• a timing controller for driving a row driver and a column driver of the display panel;
• the row driver for generating and supplying scan pulses to scan lines of the display panel based on a row driver control signal from the timing controller;
• the column driver for supplying data voltage to data lines of the display panel based on a column driver data control signal from the timing controller in the display mode, and sensing a mobility and threshold voltage of a driving transistor for each of a plurality of pixels of the display panel based on a column driver sense control signal from the timing controller and supplying a mobility sensing value and a threshold voltage sensing value for each pixel to the timing controller in the sensing mode;
• and
• a memory in communication with the timing controller for storing the mobility sensing value and the threshold voltage sensing value,
• wherein, in the sensing mode, the timing controller calculates a threshold voltage prediction value of the driving transistor for each pixel using the mobility and the threshold voltage of the driving transistor for the pixel,
• wherein, in the display mode, the panel driver drives each pixel based on the threshold voltage prediction value of the pixel,
• wherein the mobility and the threshold voltage of the driving transistor of each pixel are sensed at a shortened sensing time before a voltage saturation time at which a sensing voltage in accordance with a current flowing in the driving transistor is saturated, and
• wherein the timing controller calculates the threshold voltage prediction value for each pixel corresponding to the voltage saturation time on the basis of the threshold voltage sensing value of the driving transistor of the pixel, the mobility sensing value of the driving transistor of the pixel, and a capacitance of a reference line connected to a sensing node of the pixel.