Abstract: A three-dimensional, black-white or color television display device which is compatible for two-dimensional television. Located in front of the screen of a direct-view display tube is a removable strip or dot filter having alternatingly light-reflecting and light-dispersing strips or dots and light-transmissive, polarizing or light-selecting strips or areas. The display device is provided with a projection display tube which gives with three-dimensional display an image on the strip or dot filter via a polarizer or light-selecting filter. By means of spectacles having polarized glasses or light-selecting glasses an observer can observe a three-dimensional image.

Abstract: A black-white or color television camera comprising a pick-up tube, provided with a signal electrode composed of separated strips. Prior to a line scan to be performed by an electron beam, the signal electrode strips are connected to a reference potential. After a scan the strips are through-connected successively through associated switches for supplying information. The switch outputs are alternatingly, in at least two groups through-connected and connected to at least two output leads. Always two stitches, which are connected to two adjacent strips are closed simultaneously. In this way it is avoided that a capacitive voltage distribution across the strips and switch inputs influence the picture signal obtained in a disturbing manner.

Abstract: When the information of a continuous-motion video record is displayed in the stop-motion mode by repeated display of two fields which form an interlaced picture, motion in the scene gives rise to a frame-frequency flicker phenomenon in the stop-motion picture. By forming suitable video signal combinations in discrete groups which each comprise two associated fields and by recording these combinations in the video record, the flicker phenomenon in a stop-motion picture is eliminated without continuous display being perceptibly affected.

Abstract: A black-white or color television camera has a pick-up tube having a signal electrode comprising separate strips. Before a line scanning operation to be performed by an electron beam takes place, the signal electrode strips are coupled to a reference potential. After the line scan, the strips which are coupled separately to parallel inputs of a switching circuit which is provided with switches coupled to the parallel inputs, are coupled for supplying video information. This results in a separation between electron beam scanning and picture signal supply by the pick-up tube, which has the advantage that the beam scanning does not affect the picture quality in the direction of line scan. Furthermore, the construction with strips yield an improved signal-to-noise ratio. The switching circuit may, possibly together with a shift register, be integrated in a semiconductor body, which is provided near the signal electrode in the pick-up tube or outside the pick-tube.

Abstract: A field-sequential color television camera provided with a pick-up device formed with a number of read strips to be read simultaneously along and in front of which filter strips of a color filter move. An output of the pick-up device supplying output signals associated with successively different colors of the filter strips and with a given read strips is associated with each read strip. The outputs of the pick-up device are connected to a sequential-simultaneous converter so that picture signals each associated with a different color but with an instantaneously identical read strip of the number of read strips occur at camera outputs through a switching circuit and delay circuit. Movement in a scene does not exhibit any disturbing discolored edges upon display such as a so-called "color break". A simple converter construction is possible.

Abstract: A vertical aperture correction circuit for television in which two cheap narrow-band delay circuits are used for giving a line period delay by means of signal modulation. High-frequency video information is applied through a highpass filter to an adder stage to which furthermore the low-frequency video information delayed over one line period and the aperture correction signal are applied. The highpass filter may be formed with a third narrow-band delay circuit as a bandpass filter.