How come the Backlight is the only thing turning on?

My IPhone 6 recently started to show only a blueish backlight when trying to turn it on, and even when it is simply set down onto the table. If im watching a video or listening to music it will continue to play audio but there is no display. The only way i have overcome this is by holding the power button and home button for 10 seconds untill it restarts the phone. I did get a screen replacement about 6 months ago, incase anyone i curious. (Im not very “fluent” with technical terms)