Short 57.3 KB PDF datasheet for the PG240128-A graphic display series. Following the usual numbering, it covers a 240 x 128 pixel LCD module, with A apparently marking the earlier edition compared with the B sheet. Even a brief document like this generally holds pin assignment, key electrical values and outline dimensions. Technicians use it to verify the connector wiring and drive voltages when a panel is blank or faded, or to judge mechanical fit of a replacement. Confirm the module label matches before relying on it.
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.