Source follower circuit or bootstrap circuit, driver circuit comprising such circuit, and display device comprising such driver circuit
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United States of America Patent
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-
Apr 20, 2010
Grant Date -
Jun 28, 2007
app pub date -
Feb 9, 2007
filing date -
Mar 26, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
In the case of using an analog buffer circuit, an input voltage is required to be added a voltage equal to a voltage between the gate and source of a polycrystalline silicon TFT; therefore, a power supply voltage is increased, thus a power consumption is increased with heat. In view of the foregoing problem, the invention provides a depletion mode polycrystalline silicon TFT as a polycrystalline silicon TFT used in an analog buffer circuit such as a source follower circuit. The depletion mode polycrystalline silicon TFT has a threshold voltage on its negative voltage side; therefore, an input voltage does not have to be increased as described above. As a result, a power supply voltage requires no increase, thus a low power consumption of a liquid crystal display device in particular can be realized.
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