Display device and driving method thereof
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United States of America Patent
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Jun 22, 2004
Grant Date -
Oct 3, 2002
app pub date -
Aug 22, 2001
filing date -
Mar 30, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
In an active matrix display device utilizing electro-optical elements such as organic EL elements capable of obtaining a high image quality with a low power, each pixel circuit is provided with: a sampling circuit for sampling a signal voltage on a signal wiring line synchronously with a scan pulse; a reference voltage; and a comparator circuit. In the pixel circuit, the sampled signal voltage is compared with the reference voltage and the display time of each EL device is controlled by the period until the relation between the signal voltage and reference voltage is inverted, to thereby control the light emission time in one frame period.
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