System and methods for aging compensation in AMOLED displays
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United States of America Patent
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Jul 5, 2016
Grant Date -
Sep 12, 2013
app pub date -
Apr 24, 2013
filing date -
Nov 30, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A voltage-programmed display system allows measurement of effects on pixels in a panel that includes both active pixels and reference pixels coupled to a supply line and a programming line. The reference pixels are controlled so that they are not subject to substantial changes due to aging and operating conditions over time. A readout circuit is coupled to the active pixels and the reference pixels for reading at least one of current, voltage or charge from the pixels when they are supplied with known input signals. The readout circuit is subject to changes due to aging and operating conditions over time, but the readout values from the reference pixels are used to adjust the readout values from the active pixels to compensate for the unwanted effects.
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