Datasheet for the PS128128LRF-XNN-B-01 LCD module, 213 KB PDF, with the trailing 01 probably a document revision. The code follows the same option-letter style as the PG graphic modules in this set. Expect pinout, mechanical drawing, electrical characteristics and interface timing. A technician would use it to verify logic and drive voltages at the connector, locate backlight pins and plan a replacement. Check that the label on the panel carries this exact code, since suffix options affect compatibility.
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.