prevent reuse of a stopped thread

diff --git a/displayio/_display.py b/displayio/_display.py
index da94fb2bc433a8f0c769cffc1af70256b26f749f..241a0aa7ccb9fcc73ed4c5631aed8fbdefb40e05 100644 (file)
--- a/displayio/_display.py
+++ b/displayio/_display.py
@@ -394,6 +394,7 @@ class Display:
         elif not value and self._refresh_thread.is_alive():
             # Stop the thread
             self._refresh_thread.join()
+            self._refresh_thread = None
 
     @property
     def brightness(self) -> float: