Active matrix display device compensating for ageing of the display element and variations in drive transistor threshold voltage
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United States of America Patent
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Dec 15, 2015
Grant Date -
Nov 16, 2006
app pub date -
Aug 26, 2004
filing date -
Sep 2, 2003
priority date (Note) -
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Abstract
An active matrix LED display has a light-dependent device for detecting the brightness of the display element and threshold voltage measurement circuitry for measuring a threshold voltage of a pixel the drive transistor. Compensation for ageing of the display element is thus provided by an optical feedback path, and compensation for drive transistor threshold variations is provided by measurement of the threshold voltage. This provides a reliable compensation scheme for the threshold voltage variations, while also providing ageing compensation.
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