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What kind of phone? It will help to put your model here. With out the model, we are somewhat lost. General ideas.... Make sure the battery is charged. Go to the menu options and make sure the LCD is on, if there is an option to shut off the lcd. The screen LCD may be broken or cracked. One way to test for a cracked or broken screen is to put it in the sunlight with the power off. Slowly turn the phone from side to side and up and down looking at the screen. If it is broken or cracked you may see a difference in coloring of the surface under the glass or plastic cover.
If the phone works at all, and if you have a camera on it. take a picture, then down load it to your computer to view it. If the picture takes okay, then your lcd is either broken or cracked or disconnected within the phone, or some cable could be loose as well. Anyway, hope it works.
There is a plastic cover over the LCD. Is only the cover broken? The plastic cover is easily replaceable.
But there is also a sheet of glas over the LCD. This is a part of the LCD assy and cannot be replaced without replacing the entire LCD.
As you suspect, this simply does not happen unless the LCD panel has had a physical impact. The LCD units are stress tested when manufactured and the odd ones which crack "all of a sudden" would do so within a few months of manufacture and then get replaced under manufacturer's warranty. The broken glass which you see is the cracked LCD unit and it's behind an outer plastic protective cover.
The only way to fix it is to replace the LCD panel, but it's not a DIY job and repairs will cost more than the camera is worth. The M637 will only be about two years old but it was a budget model to start with so it would be cheaper to buy a fully functional used equivalent camera. There are even brand new models of similar or better specification which will be cheaper than a repair.
If the camera works "as is" then it may be better to put up with the fault until the camera no longer works.
Try this test. While turning camera off apply light pressure to the lens tube to see if there is a point where the gear engages to close the lens fully. This fault indicates broken gear teeth on the outside of the largest diameter barrel. Scrap the lens or use it for parts. A broken gear in the motor gear box will not respond to this test whatsoever. A lens that doesn't fully close, sticks up about a quarter inch and freezes on the Canon logo on power up inidicates the focus mechanism has not fully closed--perhaps a software glitch. The repair involves desoldering plastic ribbon connections and removal of the back panel to gain access to the focusing screw type motor armature to reset the small internal lens so it is flush with the back cover. This lens prevents the lens from completely closing. Reassemble and start taking pictures again.