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Don't mind O.L.T. He's still living in 1985, so of course he's never heard of Lexus, let alone the SC.
Anyways, the LCD bleeding on the climate control is a fairly common problem. Do a search and you'll find some helpful threads on how to fix it. You can't actually 'fix' it, you have to replace the LCD screen which requires $160+ for the screen, soldering skills, and dismantling the center stack.
One of the most common problems of the SC's...go to www.lextech.com and have it sent to them and fixed for $100. I've heard good things about them and plan on using them myself.