US 9,437,142 B2 · Pixel circuit and display apparatus

Abstract

A pixel circuit, comprises two sub-pixel circuits (P1, P2) and a sixth switch unit (T6); a first terminal of the sixth switch unit (T6) is connected to an operating voltage line (Vdd), and a control terminal of the sixth switch unit is connected to a first scan signal line (Em); each of the sub-pixel circuits (P1, P2) comprises five switch units (T1, T2, T3, T4, T5), a driving unit (DT), a energy storage unit (C) and an electroluminescent unit (L), a first switch unit (T1) and a fourth switch unit (T4) in a first sub-pixel circuit (P1) share a scan signal line (Scan[3]) with a first switch unit (T1′) and a fourth switch unit (T4′) in a second sub-pixel circuit (P2), and a third switch unit (T3) in the first sub-pixel circuit (P1) share a scan signal line (Scan[2]) with a third switch unit (T3′) in the second sub-pixel circuit (P2). The pixel circuit completely solves the problem of non-uniformity in the display brightness due to drifting of the threshold voltage of the driving transistor. Meanwhile, one compensation circuit is used to drive two pixels, and two adjacent pixels share multiple signal lines, which can reduce the number of signal lines for the pixel circuit in a display apparatus, lower the cost of the integration circuit, decrease the pixel pitch, and increase the pixel density.

A pixel circuit comprising two sub-pixel circuits, wherein

each of the sub-pixel circuits comprises a first to a fifth switch units, a driving unit, an energy storage unit and an electroluminescent unit;
a first terminal of the first switch unit is connected to a first terminal of the energy storage unit, a second terminal of the first switch unit is grounded, and the first switch unit is configured to ground the first terminal of the energy storage unit under the control of a scan signal line connected to a control terminal of the first switch unit;
a first terminal of the second switch unit is connected to a data voltage line, a second terminal of the second switch unit is connected to the first terminal of the energy storage unit, and the second switch unit is configured to write the voltage in the data voltage line into the first terminal of the energy storage unit under the control of a scan signal line connected to a control terminal of the second switch unit;
a first terminal of the third switch unit is connected to the second terminal of the energy storage unit, a second terminal of the third switch unit is grounded, and the third switch unit is configured to ground the second terminal of the energy storage unit under the control of a scan signal line connected to a control terminal of the third switch unit;
a first terminal of the fourth switch unit is connected to an output terminal of the driving unit, a second terminal of the fourth switch unit is connected to the second terminal of the energy storage unit, and the forth switch unit is configured to connect the output terminal of the driving unit to a control terminal of the driving unit under the control of a scan signal line connected to a control terminal of the fourth switch unit;
a first terminal of the fifth switch unit is connected to the output terminal of the driving unit, a second terminal of the fifth switch unit is connected to the electroluminescent unit, and the first switch unit is configured to introduce a driving current provided by the driving unit into the electroluminescent unit under the control of a scan signal line connected to a control terminal of the fifth switch unit;
the control terminal of the driving unit is connected to the second terminal of the energy storage unit;
in the two sub-pixel circuits, the control terminals of the first switch unit and the fourth switch unit are connected to a third scan signal line, and the control terminals of the third switch unit are connected to a second scan signal line;
the control terminals of the second switch unit and the fifth switch unit in a first sub-pixel circuit are connected to a first scan signal line, and the control terminals of the second switch unit and the fifth switch unit in a second sub-pixel circuit are connected to a fourth scan signal line;
the pixel circuit further comprises a sixth switch unit, a first terminal of which is connected to an operating voltage line, a second terminal of which is connected to the input terminals of the driving units of the two sub-pixel circuits respectively, and a control terminal of which is connected to a fifth scan signal line, and the sixth switch unit is configured to provide an operating voltage for the driving unit under the control of the fifth scan signal line.

7 more elements

Pixel circuit and display apparatus

Life of this patent

Pixel circuit and display apparatus

Life of this patent

Abstract

Claims20