Xiaomi has released eight Redmi K30 series devices this year with a variety of display types. The Chinese company has used everything from 60 Hz AMOLED screens to 144 Hz LCDs, but all Redmi K40 handsets should have high-refresh-rate panels. Fast-charging will be headed to all Redmi K40 series models, too.
https://www.notebookcheck.net/All-Xiaomi-Redmi-40-models-will-have-high-refresh-rate-displays-and-fast-charging-capabilities.505223.0.html