Display apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorsKyoung-Ju Shin, Chong-Chul Chai, Joo-Ae Youn
Life of this patent
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Abstract
A display apparatus includes a switching element having a first gate electrode, a source and drain electrode, a channel area formed between the source and drain electrode, and a second gate electrode. The second gate electrode is electrically insulated from the first gate electrode through the channel area, and different control voltages are applied to the second gate electrode according to the control period of the first gate electrode. The different control voltages are applied to the second gate electrode according to the turn on/off states of the switching element for increasing the turn on current in the channel area and for minimizing the turn off (leakage) current in the channel area.
Claims30
A display apparatus comprising:
- a thin film transistor (TFT) including a source electrode receiving a first signal, a drain electrode electrically connected to a driving voltage output terminal, a first gate electrode receiving a first switching voltage with a constant period, a channel area formed between the source electrode and the drain electrode, and a second gate electrode electrically insulated from the first gate electrode;
- and
- a current control part applying a current control signal to the second gate electrode according to the period,
- wherein the current control part comprises a first switching element including:
- a source electrode receiving the current control signal,
- a drain electrode directly connected to the second gate electrode for outputting the first current control signal, and
- a gate electrode receiving the first switching voltage.
A display apparatus comprising a driving part comprising:
- a signal control part for processing a control signal, the control signal processing a display signal and switching a pixel;
- a pull-up circuit for receiving the control signal from the signal control part and outputting a signal in a pull-up part;
- a pull-down circuit for receiving the control signal from the signal control part and outputting a signal in a pull-down part;
- and
- a current control part for controlling a current of the pull-up circuit,
- wherein the pull-up circuit comprises a TFT comprising:
- a source electrode receiving a first signal;
- a drain electrode electrically connected to a driving voltage output terminal;
- a first gate electrode receiving a first switching voltage, the first switching voltage having a constant period;
- a channel area formed between the source electrode and the drain electrode;
- and
- a second gate electrode electrically insulated from the first gate electrode,
- wherein the current control part applies a current control signal directly to the second gate electrode, and the current control signal has substantially the same period as the period of the first switching voltage,
- wherein the current control part comprises a switching element comprising:
- a source electrode receiving a first current control signal;
- a drain electrode, electrically connected to the second gate electrode, for outputting the first current control signal;
- and
- a gate electrode receiving the first switching voltage.
Dependencies are inferred from the claim text.