Drone Camouflage using live camera feed of one side (top) played on a flexible LCD panel on the other side (bottom) of the UAV creating an illusion of invisibility for the eyes on the ground.

Being invisible to the naked eye in the combat zone is always advantageous and also gives an edge over the enemy,
And this kind of invisibility is ideal for small tactical drones (aircraft) which are virtually silent, thanks to electric motors.
But even with a wingspan of a few feet, they can be spotted.
This is where the below proposed camouflage technology comes into play, which would make the drones much less conspicuous.

Drone Camouflage using live camera feed of one side (top) played on a flexible LCD panel on the other side (flat bottom) of the UAV aircraft creating an illusion of invisibility for the eyes on the ground.

In this technology, apart from the main camera (for reconnaissance) underneath the UAV aircraft, there is also a secondary camera located on top of the aircraft.
The bottom of the aircraft is covered entirely with a flexible LCD panel.
While the aircraft is in the sky, the live video feed of secondary camera on top of the aircraft is played on the flexible LCD panel underneath the aircraft.
This creates the illusion that UAV is invisible in the sky for the observer on the ground, as the flexible LCD panel displays the view of the sky above the aircraft.

Small UAV's don't need to be completely invisible. A small UAV need only be hard enough to see that it will not attract the attention of casual observers.
People rarely spend much time looking up into the sky, and with no noise to alert them, they have little chance of spotting a tiny intruder that looks the same as the sky from the ground.