PDF datasheet, 178 KB, for the PG8080BRS-AYA-B display module. Following the usual numbering, 8080 suggests an 80 by 80 dot graphic LCD, with BRS-AYA-B defining the variant options. A sheet like this lists interface pins, supply and contrast voltages, backlight data, timing and mechanical drawing. Technicians use it to probe the connector on a faulty device and confirm the panel is being driven correctly. Match the full code on the module label before fitting a replacement part.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.