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Addressing Method for Tunnel Cathode Matrix

IP.com Disclosure Number: IPCOM000095291D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Wang, CC: AUTHOR

Abstract

This tunnel cathode addressing method addresses any one tunnel cathode or a group of tunnel cathodes in a matrix of M x N tunnel cathodes. It is useful in multi-aperture CRT display systems.

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Addressing Method for Tunnel Cathode Matrix

This tunnel cathode addressing method addresses any one tunnel cathode or a group of tunnel cathodes in a matrix of M x N tunnel cathodes. It is useful in multi-aperture CRT display systems.

In the upper drawings, M x N matrix 1 of tunnel cathodes is deposited on a single insulative substrate 2. By switches SC 1... SC m, all tunnel cathodes in a particular row can be activated by a particular switch. That is, each row of tunnel cathodes can be biased independently of each other row. Each vertical column of tunnel cathodes is provided with an apertured place, or control grid 3, such that there is an opening 4 immediately above the area of emission 5 of each tunnel cathode. Switches SG1... SG n are provided so that a positive voltage can be connected to any control grid 3.

A particular tunnel cathode is addressed by simultaneously closing the row switch SC m corresponding to the row in which it is located and the switch SG n which provides a positive voltage to its associated control grid 3. For instance, if switch SC 1 is closed, tunnel cathodes 11...In are activated. However, no electrons emitted by these cathodes pass the control grids while all control grids 3 are at a negative potential. Whereas, if switch SG 1 is closed, only electrons emitted by tunnel cathode 11 emerge from the grid. If both switches SG 1 and SG 2 are closed, electrons from both tunnel cathodes 11 and 12 will emerge from the grid.

Another arrangem...