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Hi,
If you open the cover for the SIM/SD-card, you will find an OFF button. Could you hold down this button for 5-10 seconds with the tip of a pen or similar object to see if this can help?
did you check your white balancing? Maybe that got adjusted.
Hello this is a not a any hardware problem this is a software problem for fix this please follow this steps
Go to Setting-->Display-->Adaptive brightness
Check Adaptive brightness is on then switch to off but make sure this is may be used more battery but you may be fix this issue
And still problem not solved then make software repair and then contact customer care support for physical repair if problem not solved..