PDF of 2.59 MB for the LM220WE1, a code that corresponds to an LCD panel model; the name says nothing more, so the content is likely the panel specification. Panel documents of this kind describe the interface connector pinout, supply voltage, signal timing and backlight characteristics. Use it to check pins at the panel connector, confirm voltages and judge whether a replacement panel will fit. Match the full model and suffix on the panel label before relying on it.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @datasheets1. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.