Correction of TFT non-uniformity in AMOLED display
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United States of America Patent
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Jan 7, 2014
Grant Date -
Aug 27, 2009
app pub date -
Feb 19, 2009
filing date -
Feb 25, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Sub-pixel current in an OLED display is forced to converge to a desired level regardless of the source of pixel current error. By using a feedback loop, the pixel transistor current is forced to be equal to a predetermined target current that is established by an analog control circuit. The predetermined target current is selected to generate the desired pixel transistor current through the sub-pixel, and can be set by setting a target voltage. The sub-pixels have a 3T cell structure including 3 TFTs, one TFT for connecting the data line to the storage capacitor, another TFT for driving the sub-pixel current, and still another TFT for connecting the OLED diode anode to the data line of the AMOLED panel. Thus, the feedback loop of the present invention (comprising Taps M and N of a resistor string, and an amplifier, a comparator, and digital logic) senses the pixel transistor current via the data lines of the AMOLED panel to compensate for Mura.
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