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Display Based on the Johnson Rahbeck Effect

IP.com Disclosure Number: IPCOM000090387D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Keyes, RW: AUTHOR

Abstract

A display is provided which employs the Johnson-Rahbeck effect. The display includes two sheets of material normally separated from each other and appears transparent. When a voltage is applied at any point between the two sheets, an attractive force is provided at that point which brings the two sheets into contact. A black appearing point is then produced due to the change in reflectivity brought about by the pressure at the point of contact. The electrostatic forces are applied selectively to patterns of vertical wires on one sheet and horizontal wires on the other sheet to obtain the desired pattern to be displayed. Alternatively, the electrostatic forces can be provided by charges deposited by an electron beam.

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Display Based on the Johnson Rahbeck Effect

A display is provided which employs the Johnson-Rahbeck effect. The display includes two sheets of material normally separated from each other and appears transparent. When a voltage is applied at any point between the two sheets, an attractive force is provided at that point which brings the two sheets into contact. A black appearing point is then produced due to the change in reflectivity brought about by the pressure at the point of contact. The electrostatic forces are applied selectively to patterns of vertical wires on one sheet and horizontal wires on the other sheet to obtain the desired pattern to be displayed. Alternatively, the electrostatic forces can be provided by charges deposited by an electron beam.

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