Datasheet for the PSE12864MRT-005L01 graphic module, a 4.88 MB PDF and companion to the URT version with almost the same number. The 12864 figure points to a 128x64 dot matrix LCD, while the meaning of the MRT letters is not given in the name. The sheet should cover connector pins, controller interface, electrical characteristics, backlight data and mechanical dimensions. It helps when checking contrast and supply rails on a blank display. Confirm the exact suffix on the hardware before relying on any values.
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.