PC1002ARS-AHH-A is documented in this 222 KB PDF, a datasheet for a character display coded in the Powertip manner as a 10-character by 2-line module. The AHH option letters and revision A define the exact variant, worth checking against the part label. Content generally includes dimensions, pinout, absolute ratings, electrical characteristics and timing for the built-in controller. Repair work uses it for confirming the supply rails and backlight connection, or for picking a compatible replacement when the original fails.
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.