10.1 Screen structure overview (SScreen Class)
RPiSpark has provided a properties for operation display: Screen, which allows you to using RPiSpark's OLED screen. ( Screen is a SScreen instance. )
The Screen contains the following classes:
Display（ In RPiSparkModule v1.1 this is a SSD1306_128x64 driver instance ）
Using the OLED driver instance object, you can do: turn off the display, adjust contrast, and more.
Canvas（ In RPiSparkModule v1.1 this is a PIL ImageDraw instance ）
When RPiSpark.Screen.refresh() is called, everything drawn on this canvas is updated to the OLED screen. Canvas is a PIL ImageDraw instance, you can use all the drawing methods of PIL ImageDraw. Please refer to PIL ImageDraw manual.
View（ In RPiSparkModule v1.1 this is a SSRect instance ）
The size of the viewport, you can change the position of the View and you can also change the size of the View. Then call RPiSpark.Screen.refresh() display the content update of this View area to the OLED display. The default size is equal to the size of the OLED display (128 x 64)