Our plasma units will allow you to do that to reduce image retention; the LCDs, however, do not. You might check to see if there is a screen protection option available in your cable/sat box that will essentially fill the sides with color.
I hope that helps.
Hi I have a LCD TV 40' 750series
I know you can change the color of the bars that appear when watching 4:3 tv but i can't find out how in the manual. Can u explain how to change the colors?