Japanese electronics company Panasonic just made a TV screen which is completely invisible when not in use . Organic light-emitting diode(OLED) technology makes it possible .In OLED technology each pixel is determinde by a Light emitting diode to light itself rather than being lit from behind which is used in classic LCD or LED screen .
Although the controller and other circuitary electronics components are visible but they are placed on bottom of screen in such a way that screen seems like completely invisible . Because screen need only wires to lit up the LED in each pixel and these wires can be made from invisible conductive glass fiber . So only screen are invisible whole monitor is not which is possible only if we could make each electronics components made from transparent material which is still a field of research in electronics .