Apple brought mini LED displays to the iPad Pro 12.9 a few months ago, with the iPad Pro 11 remaining on an IPS panel. However, a new report claims that Apple is already working on LTPO OLED displays for future iPad Pro models, shifting away from IPS panels completely. Supposedly, these LTPO OLED displays will be particularly bright, not just colour accurate.
https://www.notebookcheck.net/Future-Apple-iPad-Pros-to-feature-LTPO-OLED-displays.569982.0.html