Reset the display.

def reset(self):
        """Reset the display."""
        if self._rst is None:
            return
        # Set reset high for a millisecond.
        self._rst.value = True
        time.sleep(0.001)
        # Set reset low for 10 milliseconds.
        self._rst.value = False
        time.sleep(0.010)
        # Set reset high again.
        self._rst.value = False