System and methods for aging compensation in AMOLED displays

摘要

Methods and systems to provide baseline measurements for aging compensation for a display device are disclosed. An example display system has a plurality of active pixels and a reference pixel. Common input signals are provided to the reference pixel and the plurality of active pixels. The outputs of the reference pixel is measured and compared to the output of the active pixels to determine aging effects. The display system may also be tested applying a first known reference current to a current comparator with a second variable reference current and the output of a device under test such as one of the pixels. The variable reference current is adjusted until the second current and the output of the device under test is equivalent of the first current. The resulting current of the device under test is stored in a look up table for a baseline for aging measurements during the display system operation. The display system may also be tested to determine production flaws by determining anomalies such as short circuits in pixel components such as OLEDs and drive transistors.

主权项

1. A voltage-programmed display panel allowing measurement of effects on pixels in the panel, comprising:
a plurality of active pixels forming the display panel to display an image under an operating condition, the active pixels each being coupled to a supply line and a programming line for displaying images under said operating condition; a reference pixel coupled to the supply line and the programming line, the reference pixel being coupled to said supply line and said programming line in a manner that said reference pixel has only a controlled condition independent of the operating condition; and a controller coupled to each of the plurality of active pixels and reference pixel, the controller causing a test voltage to be applied to the plurality of active pixels and the reference pixel, the controller further comparing an output of the reference pixel in comparison with the output of one of the plurality of active pixels.