here is my suggestion when you get around taking screenshots.
project an image that has both "white" and "black" areas. even better would be a test image with black, white, and a few other colors.
take two pictures with the camera setting exactly the same and from the same viewing position. one photo with the backlight on and one photo with the backlight off. that should be enough to evaluate your creation.
i hope you can accomodate this. thanks.