Datasheet in PDF, 249 KB, for the PG12864LRF-YRA-H-Y1 graphic LCD module, a Y1 sub-version of the YRA-H build in the 128 by 64 pixel PG12864 range. A separate sheet exists for the version without the Y1 ending, so pick the one that matches your label. Content normally includes pinout, electrical characteristics, backlight ratings, timing and outline drawings. Use it to verify supply rails at the connector, diagnose a dead or dim display and confirm whether a replacement fits mechanically and electrically.
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.