Just to elaborate on Daniel's answer...
The iPad mini 4 has a fused display assembly (LCD is glued to the digitizer), similar to those found on the iPhone and Air2/Pro iPad models. Technically speaking, if only the digitizer is damaged, it can be replaced independently but this requires a repair shop that has a full suite of tools for screen refurbishment. It is certainly not a DIY repair and even an experienced tech will not get good results unless they have the proper tools. AFAIK, very few people refurbish iPad screens.