https://www.actis.co.in/make-seams-gaps-video-wall-vanish"While the use of thin bezel displays is becoming popular for video walls, the visible gap between neighbouring LCD panels can still be a problem when the viewing distances are small.
DNP recently introduced InvisiBezel to tackle this by “optically” reducing the gap to 1mm – which creates a virtually seamless viewing experience. This is an optical front cover which can be mounted on top of most popular 46” super-narrow-bezel LCD panels (from leading manufacturers such as Samsung, Toshiba, Panasonic and NEC).
The edges consist of prisms that optically stretch the pixels near the edge of the LCD panel (see image below), and has the effect of concealing the bezel/gap. As a secondary benefit, it also protects the LCD panels from damage due to scratches."