Importance

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Abstract

A pixel for displaying an image with uniform brightness is provided. The pixel includes an organic light emitting diode (OLED) that is driven by a pixel circuit. The pixel circuit is coupled to a data line, two scan lines, and an emission control line of a display device. The pixel is provided with power from external power supply sources and an initialization voltage source. The pixel circuit includes transistors and a storage capacitor that maintains a voltage at a gate of a driving transistor masking any variation between the threshold voltages of the driving transistors used in various pixels. An alternative embodiment, modifies a leakage path from the gate of the driving transistor to the initialization voltage source. Substantial impact of the leakage is shifted from the gate to drain of the driving transistor. As a result, a substantially uniform brightness is maintained in each pixel.

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First Claim