I have not used such film but did one better--I had custom polarized sunglasses made with the polarizers matched to the exact angle of my screen's polarizer. So my glasses darken the world, but not my screen. Cost me about $250, had then made at Lens Crafters. I brought in my laptop, and worked with the actual technician to set the lens blanks up correctly in the lens cutting machine. The angle I wanted was 45 degrees off from what they normally do.
