Why is my lcd flat screen monitor dark on one side

[TERENCE GAITHER]

I HAVE A SANYO 47" LCD FLAT SCREEN TV THAT THE RIGHT HALF OF THE SCREEN GOES DARK.WHAT CAUSES THIS???

 

[Pyree]

The back light died.

 

[truegenius]

or maybe bright frame feature of lcd is ON,
or demo of settings are ON