code: def display(self):
          
          self.command(SSD1306_COLUMNADDR)
          self.command(0)              # Column start address. (0 = reset)
          self.command(self.width-1)   # Column end address.
          self.command(SSD1306_PAGEADDR)
          self.command(0)              # Page start address. (0 = reset)
          self.command(self._pages-1)  # Page end address.
          # Write buffer data.
          if self._spi is not None:
              # Set DC high for data.
              self._gpio.set_high(self._dc)
              # Write buffer.
              self._spi.write(self._buffer)
          else:
              for i in range(0, len(self._buffer), 16):
                  control = 0x40   # Co = 0, DC = 0
                  self._i2c.writeList(control, self._buffer[i:i+16])
docs: Write display buffer to physical display.