Datasheet for the PG128128LRF-ATA-H graphic LCD module, a 128 x 128 dot Powertip display, supplied as a 521 KB PDF. The name includes an OK tag, likely marking the document as checked. Letters after the base number encode variant details such as LCD mode, backlight and temperature range, so the label on your module should match exactly. The sheet is useful for pinout, outline dimensions, supply and backlight ratings, and controller timing when servicing or substituting the display in panel meters or control equipment.
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.