If this is new you take it back as unacceptable to you. If it's an old model I see this as the LCD ages. About 5 years or if the Sun hits the LCD I've seen it and the fix is to replace the LCD.
Bob
I have a Samsung 46" Class / 1080p / 120Hz/ LED-LCD HDTV. model number 46d6000sf.
the color on my picture is different on the right side of the screen than it is on the left. The color is warmer on the right side compared to the left. It's very noticiable when there are two people on the screen. the skin tone is more natural and warmer for the person on the right. The person on the left has very cold skin tone.
how can i fix this?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic