The display of the phone is gone then what is the way to get the files

If the phone was saving to external microSD card, simply take out the card and retrieve the files from the SD card using an SD Card reader.

If the phone still turns on, and the information was not on the card, try installing Nokia suite, and connect the phone to a PC to download your information.

https://www.microsoft.com/en-us/download...

When you plug it into the computer, the phone asks if you want to use the suite or mass storage mode. Unfortunately you will have to guess up / down on the phone, and press the select button.