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Browse Prior Art Database

Neutralization of Manufacturing Defects in a Display Device

IP.com Disclosure Number: IPCOM000051470D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Barclay, DJ: AUTHOR [+2]

Abstract

An electro-optic display uses display electrodes 1 connected by vias 2 to electronic switches (not shown). Defects in the manufacture of the switches leading to them being permanently off (open circuit) can, if the number of such defects is sufficiently low and their distribution sufficiently random, be tolerated. However, even a single defective switch which is permanently on (closed circuit) must be eliminated. This article suggests two methods of neutralizing switches which are manufactured permanently.

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Neutralization of Manufacturing Defects in a Display Device

An electro-optic display uses display electrodes 1 connected by vias 2 to electronic switches (not shown). Defects in the manufacture of the switches leading to them being permanently off (open circuit) can, if the number of such defects is sufficiently low and their distribution sufficiently random, be tolerated. However, even a single defective switch which is permanently on (closed circuit) must be eliminated. This article suggests two methods of neutralizing switches which are manufactured permanently.

Both methods employ the technique of turning off all switches it is possible to turn off. Current flow is then generated through the permanently on switches which is then used for anodizing aluminum or for the electrodeposition of chrome which then spontaneously oxidizes. In this way an insulating layer is interposed between the switch and a counter electrode, preventing current flow through the switch and the counter electrode. As shown in the drawing, the insulating layer may be a layer 3 on the surface of the display electrode 1. A disadvantage of this arrangement is that the layer 3 has different optical characteristics to the display electrode 1 giving the display device an inhomogenous appearance. This is overcome by generating the insulating layer as a coating 4 on the via 2. Display electrodes are then vapor-deposited at every via 2.

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