A solid state scanning system includes a body of semiconductive material, such as cadmium sulfide, which exhibits moving high field instability effects, and a light projection system having Schlieren optics to detect surface disturbances caused by a propagating high field domain nucleated within the semiconductor body. The light is preferably directed onto the semiconductor surface by a plurality of louvered mirror strips which also detect the light reflections therefrom. The system may also include a display means to show the relief profile of the surface disturbances in the form of a raster of brightness information representing variations in the voltage across the domain which occurs during the propagation. A layer of a high coupling constant material can be provided on the device to enhance the disturbance effect. A liquid or plastic film can also be used on the device to introduce memory in the system.

Solid state scanning by detecting the relief profile of a semiconductor body

A method of forming an image comprising providing a device for imparting respective phase-shifts to different regions of an incid¬ ent wavefront, wherein the phase shifts give rise to an image in a replay field, and causing zero-order light to be focused into a re¬ gion between the replay field and the device.

Method of forming an image and image projection device

Display device utilizing a medium that alters the degree of refraction of light

1,027,910. Colour television; light modulating. GENERAL ELECTRIC CO. Oct. 8, 1964 [Oct. 16, 1963], No. 41142/64. Heading H4F. [Also in Division H1] In a projection television system particularly for colour in which a light modulating medium located between input and output masks is deformed into diffraction gratings by an electron beam, either the input or the output mask is formed on the inner surface of the input or output window of the electron beam evacuated enclosure and the light modulating medium is adjacent the other window. In either case the window is convex towards the source of light and forms an element of a lens system, i.e. a lenticular lens plate of the input lens system or a part of the projection lens system. The masks comprise opaque bars which may be in three groups with a central group at right-angles to the outer groups for the transmission of different colour components. The input lens system also includes a further lenticular lens plate and a dichroic filter.

Light valve projection apparatus

A display tube is provided in which a dielectric target is charged by an information modulated electron beam, and the resulting electrostatic field between the target and a conductive ground plane deforms a dielectric film. The film is located in a separate chamber of the tube at the side of the target opposite the electron beam generating equipment. The film deformations behave as point light valves, and a visible image of the information contained therein is provided by transmissive or reflective optical systems.

Deformographic storage display tube

Apparatus for reproducing television pictures

Bar system in schlieren-optical systems

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Apparatus for reproducing television pictures

Bar system in schlieren-optical systems