PIXEL CIRCUIT AND DISPLAY APPARATUS

摘要

Provided is a pixel circuit comprising two sub-pixel circuits(P1, P2) of the same structure. Each sub-pixel circuit(P1, P2) comprises five switch units(T1, T2, T3, T4, T5), a driving unit(DT), an energy storage unit(C) and an electroluminescent unit(L). The two sub-pixel circuits (P1, P2) are connected to the same operating voltage line(Vdd), the same data voltage line(Vdata), the same first scanning signal line(Scan[1]), and the same third scanning signal line(Scan[3]), and are connected to different second scanning signal lines(Scan[2]), so that in the pixel circuit, the operating current flowing through the electroluminescent unit(L) is not affected by the threshold voltage of the corresponding driving transistor, completely solving the problem of non-uniformity in the display brightness due to drifting of the threshold voltage of the driving transistor. Meanwhile, a compensation circuit is used to drive two pixels(P1, P2), and two adjacent pixels(P1, P2) share a plurality of signal lines, thus reducing the number of signal lines for the pixel circuits in a display apparatus, decreasing the pixel pitch, and increasing the pixel density. Also provided is a display apparatus using the pixel circuit.

主权项

1. A pixel circuit comprising two sub-pixel circuits, wherein
each sub-pixel circuit comprises a first switch unit, a second switch unit, a third switch element, a fourth switch unit, a fifth switch unit, a driving unit, an energy storage unit and an electroluminescent element; and a first terminal of the first switch unit is connected to an operating voltage line, a second terminal of the first switch unit is connected to an input of the driving unit, and the first switch unit is configured to provide an operating voltage to the driving unit under the control of a scanning signal line connected to a control terminal of the first switch unit; a first terminal of the second switch unit is connected to an output of the driving unit, a second terminal of the second switch unit is connected to the electroluminescent element, and the second switch unit is configured to introduce a driving current provided by the driving unit into the electroluminescent element under the control of a scanning signal line connected to a control terminal of the second switch unit; a first terminal of the third switch unit is connected to a data voltage line, a second terminal of the third switch unit is connected to the input of the driving unit, and the third switch unit is configured to connect the input of the driving unit to the data voltage line under the control of a scanning signal line connected to a control terminal of the third switch unit; a first terminal of the fourth switch unit is connected to the output of the driving unit, a second terminal of the fourth switch unit is connected to a first terminal of the energy storage unit and a control terminal of the driving unit, and the fourth switch unit is configured to make the output terminal of the driving unit and the control terminal of the driving unit conductive and charge the first terminal of the energy storage unit with the voltage at the output of the driving unit under the control of a scanning signal line connected to a control terminal of the fourth switch unit; a first terminal of the fifth switch unit is connected to the first terminal of the energy storage unit, a second terminal of the fifth switch unit is grounded, and the fifth switch unit is configured to set the voltage at the first terminal of the energy storage unit to zero under the control of a scanning signal line connected to a control terminal of the fifth switch unit; and in the two sub-pixel circuits, the first terminals of the third switch units are connected to the same data voltage line, the control terminals of the first switch units and the second switch units are all connected to a third scanning signal line, the control terminals of the fifth switch units are connected to a fourth scanning signal line, the control terminals of the third switch unit and the fourth switch unit in the first sub-pixel circuit are both connected to a first scanning signal line, and the control terminals of the third switch unit and the fourth switch unit in the second sub-pixel circuit are both connected to a second scanning signal line.