Backlight can't be turned off or dimmed

[iansan5653]

The backlight cannot be turned off at all. Originally I integrated a photosensor into the design so the backlight could be controlled automatically, but the LCD display board I used seems to be incorrectly designed (internally) such that the backlight is permanently on. In the daytime, this makes the display hard to read. In the nighttime, it is almost blinding.

I think a solution here may just be to not support backlighting at all -- it doesn't feel necessary.