The color or difference between lit or not lit is not enough for me to see. The 3 dots look the same to me off or on.
I like that idea and it is certainly worth a try. I ordered 9 Pieces Gel Filter Transparent Color Film that will arrive tomorrow and I'll see if it works.I think if you put a blue filter in front of the part of the display that shows the dots, they'll appear black when illuminated. But it would interfere with being able to press the button to change the setting...