US 9,852,685 B2 · Pixel circuit and driving method thereof, display apparatus

Abstract

There are provided a pixel circuit and a driving method thereof, and a display apparatus. The pixel circuit comprises: a first transistor (T1), a second transistor (T2), a third transistor (T3), a storage capacitor (C1) and a light emitting device (L). A gate of the first transistor (T1) is connected to a first control signal terminal (S1), and a first electrode thereof is connected to a data signal terminal (DATA); a gate of the second transistor (T2) is connected to a second electrode of the first transistor (T1), a first electrode thereof is connected to a second electrode of the third transistor (T3), and a second electrode thereof is connected to a first terminal of the light emitting device (L); a gate of the third transistor (3) is connected to a second control signal terminal (S2), and a first electrode thereof is connected to a first power supply signal terminal (ELVDD); one terminal of the storage capacitor (C1) is connected to the gate of the second transistor (T2), and the other terminal thereof is connected to the second electrode of the second transistor (T2); one terminal of a parasitic capacitor (C2) formed by the light emitting device is connected to the first terminal of the light emitting device (L), and the other terminal thereof is connected to a second terminal of the light emitting device (L); and the second terminal of the light emitting device (L) is further connected to a second power supply signal terminal (ELVSS). The pixel circuit can compensate for the threshold voltage drift of TFT effectively and rise display effect.

Claims13

Dependent claims

A pixel circuit, comprising:

only a first transistor, a second transistor, a third transistor, a storage capacitor and a light emitting device;
a gate of the first transistor is connected to a first control signal terminal, and a first electrode thereof is directly connected to a data signal terminal;
a gate of the second transistor is connected to a second electrode of the first transistor, a first electrode thereof is connected to a second electrode of the third transistor, and a second electrode thereof is connected to a first terminal of the light emitting device;
a gate of the third transistor is connected to a second control signal terminal, and a first electrode thereof is connected to a first power supply signal terminal;
one terminal of the storage capacitor is connected to the gate of the second transistor, and the other terminal thereof is connected to the second electrode of the second transistor;
one terminal of a parasitic capacitor formed by the light emitting device is connected to the first terminal of the light emitting device, and the other terminal thereof is connected to a second terminal of the light emitting device;
and
the second terminal of the light emitting device is further connected to a second power supply signal terminal.

5 more elements

A pixel circuit driving method for driving a pixel circuit which comprises only a first transistor, a second transistor, a third transistor, a storage capacitor and a light emitting device, comprising following steps:

in a first phase, turning on the first transistor and the third transistor;
inputting a first voltage by a first power supply signal terminal, inputting a reset signal by a data signal terminal, turning on the second transistor, and controlling the light emitting device to be in a turn-off state, such that a voltage of the storage capacitor is greater than a threshold voltage of the second transistor;
in a second phase, maintaining the first transistor and the third transistor turning on;
making the light emitting device be in the turn-off state, inputting a second voltage by the first power supply signal terminal until the second transistor is turned off, and making the voltage of the storage capacitor equal to the threshold voltage of the second transistor;
in a third phase, maintaining the first transistor turning on;
turning off the third transistor, inputting a data signal by the data signal terminal, so that the second transistor is turned on, and data is written into the first terminal of the light emitting device through an voltage dividing effect of the storage capacitor and a parasitic capacitor formed by the light emitting device;
and
in a fourth phase, turning off the first transistor, turning on the third transistor, and driving the light emitting device to emit light by a current flowing through the second transistor and the third transistor.

5 more elements

Dependencies are inferred from the claim text.

Pixel circuit and driving method thereof, display apparatus

Life of this patent

Pixel circuit and driving method thereof, display apparatus

Life of this patent

Abstract

Claims13