Organic light emitting diode display device and method for compensating for luminance variations thereof

1. An organic light emitting diode display device, comprising:

a display panel including a plurality of pixels in a display region, each pixel including a switching thin film transistor, a driving thin film transistor, and a light emitting diode, the display region divided into a plurality of regions;

a diode current measuring portion electrically connected to the light emitting diode of each pixel and measuring a current of each divided region to generate a contour plot of luminance based on the measured current;

a timing control portion obtaining a gain value of each divided region based on the measured current of each divided region, and generating compensated image data using the gain value to compensate for non-uniformity of luminance in the display region according to the contour plot of luminance generated based on the measured current;

a gate driver supplying gate voltages to the display panel; and

a data driver supplying data voltages corresponding to the compensated image data to the display panel.

2. The device of claim 1 , wherein the timing control portion includes a storing portion that stores the measured current by the diode current measuring portion.

3. The device of claim 2 , wherein the timing control portion converts the measured current into the gain value and stores the gain value in the storing portion.

4. A method of compensating for a luminance variation of an organic light emitting diode display device, wherein the organic light emitting diode display device includes a display panel including a plurality of pixels in a display region, each pixel including a switching thin film transistor, a driving thin film transistor, and a light emitting diode, the display region divided into first to Nth regions, the method comprising:

measuring currents of the first to Nth regions through a diode current measuring portion;

generating a contour plot of luminance based on the measured currents of the first to Nth regions;

obtaining gain values based on the measured currents of the first to Nth regions, each of the gain values associated with a corresponding region of the first to Nth regions; and

adjusting image data signals using the gain values to compensate for non-uniformity of luminance in the display region according to the contour plot of luminance generated based on the measured currents.

5. The method of claim 4 , wherein obtaining the gain values comprises:

obtaining a maximum current among the currents of the first to Nth regions; and

dividing, for each of the first to Nth regions, a measured current of a region by the maximum current to obtain an intermediate result value associated with the region, a gain value associated with the region being a reciprocal of the intermediate result value associated with the region.

6. The method of claim 4 , wherein adjusting the image data signals using the gain values includes multiplying the image data signals by the gain values.