1.  They are used in different environments Indoor/Outdoor.
  2.  Indoor LED Display is not waterproof Usually IP30/IP31, while Outdoor LED Screen at least IP54 UP.
  3. Indoor LED Display brightness is from 100nit to 2,000nit, while the outdoor LED Screen at least up to 3000Nit.
  4. Indoor LED Lamp Usually uses SMD1010, SMD1515, SMD2121 or SMD3528, While Outdoor LED Screen Use DIP346, SMD3535, SMD2727, SMD1921, indoor LED Lamp is not waterproof, very scare of Moisture, but Outdoor LED Lamp is waterproof, anti-UV, and have good heat deception.