So how does 3D TV in Loewe perfection work? The Loewe Individual 3D flat-screen TV is synchronised with the Loewe Active 3D glasses via infrared signal. When the screen shows the picture for the left eye, the right lens is blacked out – and the same happens in reverse when the picture for the right eye is shown. The switch happens within milliseconds, allowing the viewer to experience the spatial effect of 3D.