iPad Mini Screen is not functioning correctly

so recently i took my ipad mini into the car and its pretty hot in there, but not as hot as to make you break a sweat- just pretty clammy. my ipad was charged around 70-80% and i put the brightness all the way up so i could see the screen display. This worked for a while, until i opened an app and the ipad suddenly shut off- or at least the screen went black. I tried to restart it and held down on the power button for 10+ seconds. I couldnt see anything, so i figured i would need to charge it- but it was more than halfway charged so this really confused me.

Then i started searching online- a couple of people on a few forums had the same problem- i tried holding both the home and power button for 10 seconds- nothing happened. I tried smacking my ipad (like what the forum said) and nothing happened. I tried connecting it to itunes and i heard the charging noise. Then finally, i went into a dark room and used a flashlight to angle at it and i could see the screen only faintly- the sounds work- i hear the keys click and My email and messages being recieved but the screen is just too dark to be even slightly noticeable in natural light. I tried working with the brightness but no matter where i slid it- it stayed the same. I can really only play music but that would still take a hassle to set up. All my other apps work but i am not able to use them because of how dim the screen is. I use my ipad for everything- school, digital art, the works... any suggestions?