Pixel compensation circuit
AssigneeAu Optronics Corporation
InventorChing-Chieh TSENG
Life of this patent
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Abstract
A pixel compensation circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a switch unit and a light emitting diode. The first transistor, the third transistor, the fourth transistor, the fifth transistor, and the switch unit are used to receive a respective switch signal. The pixel compensation circuit can compensate a threshold voltage of transistor automatically; and consequentially a driving current of light emitting diode is prevented from being affected by the change of the threshold voltage or the voltage drop of the light emitting diode.
Claims13
A pixel compensation circuit, comprising:
- a first transistor, configured to have a gate terminal thereof for receiving a respective switch signal and a first terminal thereof for receiving a high voltage;
- a second transistor, configured to have a first terminal thereof electrically connected to a second terminal of the first transistor;
- a third transistor, configured to have a gate terminal thereof for receiving a respective switch signal, a first terminal thereof for receiving a data signal, and a second terminal thereof electrically connected to a second terminal of the second transistor;
- a fourth transistor, configured to have a gate terminal thereof for receiving a respective switch signal, a first terminal thereof electrically connected to a second terminal of the first transistor, and the first terminal of the second transistor, and a second terminal thereof electrically connected to the gate terminal of the second transistor and a first terminal of a capacitor;
- a fifth transistor, configured to have a gate terminal thereof for receiving a respective switch signal, a first terminal thereof electrically connected to a second terminal of the capacitor, and a second terminal thereof for receiving a reference voltage;
- a switch unit, configured to receive a respective switch signal and electrically connected to the second terminal of the third transistor, the first terminal of the fifth transistor, and the second terminal of the capacitor;
- and
- a light emitting diode, configured to have a first terminal thereof electrically connected to the switch unit and a second terminal thereof for receiving the low voltage.
Dependencies are inferred from the claim text.