Abstract: An electronic window (21) employing an image taking device (22) mounted outside of a room for providing an image of a scenery external to the room. The electronic window (21) further employing a display screen (21) mounted within the room for displaying and illuminating the image at a luminance level for creating a sensation of a glass window being formed in the wall of the room. Alternatively or concurrently, the display screen (21) can direct an emission of a light beam within the room.

Abstract: The invention relates to a method of representing a video image based on a video signal by means of a projector which comprises an image display device and a high-pressure gas discharge lamp, which lamp is supplied with a square-wave alternating current (I0, I10) on which a current pulse (P1, P3, P10, P40) is superimposed before each phase reversal. According to the invention, the alternating current (I0, I10) is superimposed with a second current pulse (P2, P4, P20, P30, P50, P60) of the same polarity. A simple attunement of the alternating current frequency to the image frequency without image artefacts is made possible by the second pulses (P2, P4, P20, P30, P50, P60).