If you combine an accurate ambient light sensor with a regular old LCD you can do that pretty well, because you don't need to vary the brightness across the scr

If you combine an accurate ambient light sensor with a regular old LCD you can do that pretty well, because you don't need to vary the brightness across the screen to simulate diffuse reflections from an uneven light source to get the effect you want. Also check out those programs that redshift your monitor. Finally, try turning down your monitor's brightness.