Sorry to tell you but ... It your TV.. It is out of calibration.. you can CrAcK your TV open and adjust it... But if you dont know what your doing you can DIE.. im not KiDDing
If you lucky your tv might have controls on the back for this..
Most Tv .. will lose there Calibration over time.. Some were never set right the first time....
You can take your TV to a TV Repair shop to get this fixed.. got my SaNyO done for $15
(Week after i bought it) P.O.S.