PDF specification, 301 KB, for the PG320240WRF-HNNHP2 module, a 320 by 240 dot graphic LCD according to its numbering. The long suffix identifies a particular variant, and its exact meaning should be taken from the ordering table inside rather than assumed. Expect electrical characteristics, interface pins, timing charts and a mechanical drawing. Technicians use it to confirm connector pinout and voltage requirements, and to compare against the similar WRF-MNN-H sheet when hunting for a compatible substitute.
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 @acodis_lcd_datasheets_EDID. 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.