Smartphone pixel density

Product: [SkyController + Bebop / SkyController + Bebop2]
Product version: [X.X.X] + Bebop version: [X.X.X]
SDK version: [X.X.X]
Use of libARController: [YES/NO] (Only for ARSDK)
SDK platform: [iOS/Android/Unix/Python…]
Reproductible with the official app: [YES/NO/Not tried]


I have a stupid question, hope someone will be able to answer : What is the lowest pixel density requiered for a smartphone screen to be able reach the best FPV definition ?

Thanks !