Scanning circuit and display device
AssigneeNLT Technologies, Ltd.
InventorTomohiko OTOSE
Life of this patent
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Abstract
A display device including a scanning circuit formed using single conductivity type thin-film transistors suppresses threshold changes in the thin-film transistors forming the scanning circuit by controlling a circuit for maintaining an internal node of the unit circuits forming the scanning circuit at a constant potential is controlled by a clock signal or a pulse signal having a smaller amplitude than the amplitude of an output signal.
Claims20
A scanning circuit comprising a plurality of unit circuits, each of which comprises a plurality of single conductivity type thin-film transistors and is controlled in synchronization with a plurality of clock signals, wherein
- each of the unit circuits comprises at least an output circuit, a reset circuit, and a reset signal generation circuit;
- the output circuit comprises a circuit element for transferring one of the clock signals to an output terminal and a circuit element for maintaining the output terminal at a constant voltage;
- the reset circuit has a function of stopping the circuit element for transferring the clock signal to the output terminal;
- and
- the reset signal generation circuit generates a plurality of reset signals, the reset signals controlling the reset circuit and the circuit element for maintaining the output terminal at a constant voltage and having a smaller amplitude than an amplitude of the clock signals.
Dependencies are inferred from the claim text.