A display apparatus, comprising a display substrate having a first side for display and a second side opposite to the first side, wherein the display substrate comprises a display region, the display region comprises a plurality of pixel circuit units on a base substrate, the plurality of pixel circuit units are arranged in a plurality of rows and columns along a first direction and a second direction, and the first direction is different from the second direction; the display apparatus is configured to supply a first power voltage and a second power voltage; each of the plurality of pixel circuit units comprises a drive sub-circuit and a first connection electrode for being connected with a light-emitting element; a first terminal of the drive sub-circuit is configured to receive a pixel power voltage, a second terminal of the drive sub-circuit is configured to be electrically connected with the light-emitting element through the first connection electrode, and the drive sub-circuit of the pixel circuit unit is configured to form a driving current flowing through the light-emitting element in response to the pixel power voltage; the display region comprises a first display region and a second display region; the first display region comprises a plurality of first sub-pixels, each first sub-pixel comprises a first pixel circuit, and the first pixel circuit comprises one pixel circuit unit; the second display region comprises a plurality of second sub-pixels, each second sub-pixel comprises a second pixel circuit, and the second pixel circuit comprises two adjacent pixel circuit units; first connection electrodes of two pixel circuit units of the each second pixel circuit are electrically connected with each other to be connected to a same light-emitting element; pixel density of the plurality of first sub-pixels in the first display region is higher than pixel density of the plurality of second sub-pixels in the second display region; characterized in that, the display apparatus further comprises a first power voltage terminal and a second power voltage terminal, and the first power voltage terminal and the second power voltage terminal are insulated from each other; the first power voltage terminal is configured to transmit the first power voltage, the second power voltage terminal is configured to transmit the second power voltage, and the display apparatus is configured to set the second power voltage to be greater than the first power voltage; the first terminal of the drive sub-circuit of the pixel circuit unit in the first pixel circuit is configured to be connected with the first power voltage terminal to receive the first power voltage as the pixel power voltage of the pixel circuit unit of the first pixel circuit, and the first terminal of the drive sub-circuit of each of the two pixel circuit units in the second pixel circuit is configured to be connected with the second power voltage terminal to receive the second power voltage as the pixel power voltage of the two pixel circuit units of the second pixel circuit. each of the plurality of pixel circuit units comprises a drive sub-circuit and a first connection electrode for being connected with a light-emitting element; a first terminal of the drive sub-circuit is configured to receive a pixel power voltage, a second terminal of the drive sub-circuit is configured to be electrically connected with the light-emitting element through the first connection electrode, and the drive sub-circuit of the pixel circuit unit is configured to form a driving current flowing through the light-emitting element in response to the pixel power voltage; the display region comprises a first display region and a second display region; the first display region comprises a plurality of first sub-pixels, each first sub-pixel comprises a first pixel circuit, and the first pixel circuit comprises one pixel circuit unit; the second display region comprises a plurality of second sub-pixels, each second sub-pixel comprises a second pixel circuit, and the second pixel circuit comprises two adjacent pixel circuit units; first connection electrodes of two pixel circuit units of the each second pixel circuit are electrically connected with each other to be connected to a same light-emitting element; pixel density of the plurality of first sub-pixels in the first display region is higher than pixel density of the plurality of second sub-pixels in the second display region; characterized in that, the display apparatus further comprises a first power voltage terminal and a second power voltage terminal, and the first power voltage terminal and the second power voltage terminal are insulated from each other; the first power voltage terminal is configured to transmit the first power voltage, the second power voltage terminal is configured to transmit the second power voltage, and the display apparatus is configured to set the second power voltage to be greater than the first power voltage; the first terminal of the drive sub-circuit of the pixel circuit unit in the first pixel circuit is configured to be connected with the first power voltage terminal to receive the first power voltage as the pixel power voltage of the pixel circuit unit of the first pixel circuit, and the first terminal of the drive sub-circuit of each of the two pixel circuit units in the second pixel circuit is configured to be connected with the second power voltage terminal to receive the second power voltage as the pixel power voltage of the two pixel circuit units of the second pixel circuit.