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United States of America Patent
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Mar 31, 2009
Issued Date -
N/A
app pub date -
Jul 7, 2004
filing date -
Jul 18, 2003
priority date (Note) -
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status (Latency Note)
Importance
Abstract
When semi-amorphous TFTs are used for forming a signal line driver circuit and a pixel, a large amplitude is required for driving the pixel, and a large power supply voltage is thus needed. On the other hand, when a shift register is made up of transistors having a single conductivity, a bootstrap circuit is required, and a voltage over a power supply is applied to a specific element. Therefore, not both the driving amplitude and the reliability can be achieved with a single power supply. According to the invention, a level shifter having a single conductivity is provided to solve such a problem.
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