Browse Prior Art Database

Xerographic Display Tube

IP.com Disclosure Number: IPCOM000097093D
Original Publication Date: 1962-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Dammann, JE: AUTHOR

Abstract

The xerographic display tube is used for producing a visible display of information represented by a video input signal. A charge pattern is laid by the electron beam onto the face plate of the cathode ray tube. Small toner particles are dusted onto the glass screen by means of an air puff or by rotating the tube. These small toner particles are held against the cathode ray tube face plate in those areas having electrostatic charges. This produces a visible image of the information represented by the electrostatic charge distribution pattern.

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Xerographic Display Tube

The xerographic display tube is used for producing a visible display of information represented by a video input signal. A charge pattern is laid by the electron beam onto the face plate of the cathode ray tube. Small toner particles are dusted onto the glass screen by means of an air puff or by rotating the tube. These small toner particles are held against the cathode ray tube face plate in those areas having electrostatic charges. This produces a visible image of the information represented by the electrostatic charge distribution pattern.

The video information signal from source 1 modulates the intensity of an electron beam generated by cathode 2 and grid 3. This modulated beam is directed toward multiple fiber faceplate 4 which forms an electrostatic target. As the modulated electron beam sweeps across 4, it produces on it an electrostatic charge distribution pattern corresponding to the intensity of the modulated beam. The fibers in 4 are constructed from electroconductive glass and are insulated from each other by being embedded in an insulating glass. The electrostatic fields from the electrostatic charge distribution pattern written on 4 extend through the conductive fibers to attract oppositely charged toner particles 5.

To make the charge distribution pattern visible, the toner particles 5 in atmospheric pressure toner compartment 6 are dusted onto the exterior side of 4 by an air puff or by rotating the tube.

Toner particles 5...