I made some research on this a few days ago and found the same picture as Atak_Snajpera.
Appearently the source is this one:
http://forums.ppsspp.org/showthread....9617#pid109617 (I guess what raffriff found was the source of the shader used in the video, instead)
The author offers the fragment shader code, but it is designed to work with the PPSSPP emulator (which I have never used). We really need MysteryX's help here.
It's not just the CRT grid, but also the bowing effect that makes me doubt wether this is an actual screen or not: