Usually it turns off all of the filters/post-processing steps and tries to mimick the response times of CRT displays more closely by sending the framebuffer to

Usually it turns off all of the filters/post-processing steps and tries to mimick the response times of CRT displays more closely by sending the framebuffer to the screen as soon as possible. The works to varying degrees of success on a per-model basis. Just check out forums discussing which television to buy when you want to play music/rhythm games (like Guitar Hero) to read a lot more details about specific displays.