In the iPhone spare parts market, screens are categorized into several grades. Original Pulls are taken from used devices and offer the best quality. Refurbished (Glass Change) units use original LCD/OLED panels with new front glass. Aftermarket (High Copy) screens, such as those from manufacturers like JK, GX, or ZY, vary in color gamut and brightness. For professional repair businesses, it is critical to verify if the screen supports True Tone programming and to check the IC chip compatibility to avoid 'Unknown Part' warnings in iOS.