Why does my iphone's screen not show but it still functions?

I have a 3gs that still receives calls and functions with touch and calls and all, but the screen is blank. If i hold the home and power button together for a while, the Apple logo shows up for a quick second and the screen goes blank and the phone restarts (still functions after the reboot but screen is blank).So I don't know what the problem could be as the screen works perfectly when showing the apple logo, so now I'm confused. Somebody please help me

It's may be your display problem. You can change your display.

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