A pixel circuit and a display apparatus. The pixel circuit comprises three sub-pixel circuits (P1, P2, P3) and one power supply circuit (VL), wherein the three sub-pixel circuits (P1, P2, P3) share a data line (Data); the power supply circuit (VL) is connected to a first voltage level terminal (VA), a first signal control line (EM1) and the sub-pixel circuits (P1, P2, P3), and the power supply circuit (VL) is configured to supply a first voltage level to the sub-pixel circuits (P1, P2, P3) through the first voltage level terminal (VA) under the control of a signal of the first signal control line (EM1); and the sub-pixel circuits (P1, P2, P3) are connected to the power supply circuit (VL) and the data line (Data), and are configured to display a gray scale under the control of the first voltage level supplied by the power supply circuit (VL) and a data signal of the data line (Data). The pixel circuit can decrease the number of the signal lines used in the pixel circuit in the display apparatus, reduce the cost of the integrated circuit, and improve the pixel density of the display apparatus.