Television feature request

I rarely watch TV anymore. When I do, like for the ongoing Olympics coverage, I quickly become frustrated with commercials (especially those not appropriate for 4 year olds, even if the main show is). I want a “visual mute” feature for my television. One click on the remote kills the sound and dims the picture, down to 15% or so. Forget high-definition, how about something I can use? (Patent pending.)