You should get a brand new LCD screen and digitizer when your Xiaomi Mi 4i screen old, touch response issues. The high quality screen replacement LCD may be the part you are looking for.
Screen Size: 5.0 inches
Color: Dark Gray, Black, White, Yellow, Blue, Pink
Compatibility: Xiaomi Mi 4i
Phonelcdwholesale.com is the best place to buy for Xiaomi Mi 4i screen Replacement and digitizer. Each item was double tested before shipping and 12 months warranty.