PDF datasheet, 1.23 MB, for the PD104SL6 display panel, which by its 104 code is likely a 10.4 inch class TFT. It belongs to a family with SL3 and SL5 siblings, so pick the document that matches your panel's label exactly. Expect pin assignment for the interface connector, electrical ratings, timing charts, backlight specification and mechanical drawings. Service technicians use it to check that the controller board supplies correct voltages and signals, and to confirm interchangeability when sourcing a substitute panel.
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.