Try taking the photos in near darkness and if you've got a macro facility use it to get closer to the screen so the camera uses that for it's light balancing. If you've got flash turn it off if you can but hopefully if you are close enough to the screen the camera won't need flash.
example GPcinema2 pic.
Rest on something or use a tripod if you can. I didn't in my example above and so it's a little blurry. If you want the GP32 to show up in the photos just let a little more light into the darkened room and don't take the photo from quite as close as I did.