Series datasheet for the PG320240 graphic LCD, revision letter M, 315 KB in PDF. The numbers denote a 320 by 240 dot display, and the late revision letter suggests the document went through many updates. Content normally includes the pinout, controller interface, electrical ratings, backlight data and outline. Useful when the exact variant is unknown and only base data is needed for tracing signals. For a replacement, still check the full suffix on the original module, as options differ between versions.
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.