Method and apparatus for transmitting images to a viewing screen
AssigneeM.A.N. Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft
InventorAlfred Hirt
Life of this patent
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Abstract
Method and apparatus for the transmission of images to a screen, wherein luminescence centers of the screen are excited by way of electron beams controlled to suit the image to be transmitted. The electrons are emitted by cathode tips of a thin-film field-effect cathode. The cathode tips are driven individually, the flow of electrons emitted from each cathode tip corresponding to the grey tone for each image point. The cathode tips may be driven by mutually intersecting conducting strips to which are fed successive trigger pulses. In another version, the cathode tips are driven by the use of charge transfer systems, which enable a still picture to be produced by concurrently driving the cathode tips in their entirety.
Claims7
A method of transmitting images to a viewing screen having luminescence centers which can be excited by electron beams, comprising the steps of:
- providing a thin-film field-effect cathode having cathode tips uniformly distributed over the surface of the cathode, each cathode tip being representative of an image point to be transmitted, and
- separately controlling each cathode tip, and driving the cathode tips in the form of a double raster by charge transfer systems.
Apparatus for transmitting images, comprising a thin-film field-effect cathode having cathode tips uniformly distributed over the surface of the cathode,
- a charge transfer system associated with the cathode for individually energizing each cathode tip to produce an electron beam, and
- a fluorescent screen located within the field of the electron beams.
Dependencies are inferred from the claim text.