Oled pixel circuit, and driving method thereof, and a display apparatus

A pixel circuit comprising:

• a data-input sub-circuit having a first terminal coupled to a data line, a second terminal coupled to a first scan line configured to be provided with a first control signal, a third terminal coupled to a first node, and being configured to using the first control signal to control application of a data voltage from the data line to the first node;
• a reset sub-circuit having a first terminal coupled to a reset line, a second terminal coupled to a third scan line configured to be provided with a third control signal, and a third terminal coupled to a second node, and being configured to using the third control signal to control application of a reset voltage from the reset line to the second node;
• a driving-control sub-circuit having a first terminal coupled to a first power supply, a second terminal coupled to the first node, and a third terminal coupled to the second node;
• a power-storage sub-circuit having a first terminal coupled to the first node and a second terminal coupled to the second node, and being configured to regulate a voltage difference between the first node and the second node;
• a light-emitting device having a first terminal coupled to the second node and a second terminal coupled to a second power supply;
• and
• a sampling sub-circuit having a first terminal coupled to the data line, a second terminal coupled to a second scan line configured to be provided with a second control signal, and a third terminal coupled to the second node, and being configured to use the second control signal to control the second node being connected to the data line.