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Cracked substrate, you can tell by the curved/angled line in the top right. The substrate is a very thin piece of glass barely thicker than a piece of paper that e-ink "sits" on. You can search for teardown threads in forum if you want to see a picture of it. Basically any significant pressure on the screen, or more commonly twisting/bending of the device can induce micro-fractures and the temperature extreme from sitting in the car might have caused expansion that finally broke it. The initial fracture may have happened a while before the final break. E-ink devices are not as robust as a tablet.
NO SUPPLIER will replace a device with a cracked substrate under warranty, although some may occasionally replace it as a good will gesture.
And having it in a case won't prevent this kind of breakage unless it is extremely rigid and unbending not withstanding what some usual suspects are going to try and tell you.
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