The 264 KB PDF here is a datasheet for SFW045XS1 with an AV suffix, one entry in a series of similarly named SFW documents. No manufacturer or target device appears in the name. For a technician the value lies in confirmed specifications: pin functions, supply voltages, current draw, timing and physical dimensions, which help when probing a suspect part or choosing a substitute. Read the cover page to confirm the product family and check that the code printed on the component, suffix included, matches before applying 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.