Pixel Circuit and Driving Method Thereof, Display Substrate, and Display Apparatus

A pixel circuit is provided and configured to drive a first light emitting unit and a second light emitting unit of a sub-pixel to emit light. The pixel circuit includes: an input circuit, a first light emitting control circuit, and a second light emitting control circuit. The input circuit is configured to write a data signal provided by a data signal line to a first node and store the data signal written into the first node, under controlling of a scanning signal provided by a scanning signal line. The first light emitting control circuit is configured to provide a driving current to a second node, under controlling of a first power supply signal provided by a first power supply line, the first node, and a light emitting control signal provided by a light emitting control signal line.