Why won't my iphone 4s screen come on?

I dropped my iphone 4s in the toilet and right away i put the device in a bag of rice and now it works fine but the screen is all black… It looks just like it is off or locked, an the phone will ring and i can answer it but the screen dosent light up it just rings and i already know to slide like i would and i can hear perfect. Any help please!

Why would you putit in a bag of rice LMFAO

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