If you use the Swipe method to unlock your device, then you can change lock screen animation on LG G4 when swiping to unlock. To change lock screen animation on LG G4, first make you are using the swipe method to unlock and then do as follows:
1. Open the Settings and go the Lock screen settings
2. Tap the Screen swipe effect option and there you have 5 swipe animation to choose from: Hula hoop, Circle mosaic, Light particle, Vector circle, or Soda.