Updated code to clear the display

main.py

@@ -236,9 +236,6 @@ def main():
 
             display.Init()
 
-            logging.info("clearing display")
-            display.clear()
-
             width = display.width
             height = display.height
             image = Image.new('1', (width, height))
@@ -261,7 +258,14 @@ def main():
                 display.ShowImage()
 
             def clear_display():
-                display.clear()
+                buffer = Image.new('1', (width, height))
+                draw = ImageDraw.Draw(image)
+                draw.rectangle((0, 0, width, height), outline=0, fill=0) # black rectangle to clear screen, without clearing buffer
+                display.getbuffer(buffer)
+                display.ShowImage()
+
+            logging.info("clearing display")
+            clear_display()
 
         if "DISPLAY_IN_TERMINAL" in config['SCREEN']:
             if config['SCREEN']['DISPLAY_IN_TERMINAL'].lower() == "false":
@@ -321,9 +325,6 @@ def main():
             logging.error("the data returned from the API was not in an expected format")
             continue
 
-        if show_on_screen:
-            clear_display()
-
         glucoseMeasurement = graph['connection']['glucoseMeasurement']
 
         if show_in_terminal:
@@ -336,6 +337,8 @@ def main():
             print(f"Refresh rate:  {delay} seconds")
 
         if show_on_screen:
+            clear_display()
+
             draw.text((x, top), glucoseMeasurement['Timestamp'], font=font, fill=255)
             draw.text((x, top+8), "Glucose units: " + str(glucoseMeasurement['Value']), font=font, fill=255)
             # Don't know why these two need to have more spaces to line up with the line ebovee