Touchscreen having multiple parallel connections to each...

G - Physics – 06 – K

Patent

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G06K 11/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 2396763

A resistive or capacitive position touchscreen includes a glass substrate having a uniform resistive coating and series resistive chains of overlapping discrete electrodes adjacent to the peripheral edges of the substrate. Gaps in an otherwise insulating linear discontinuity running parallel to each chain form resistive current paths across the touch area. There are at leat two gaps for each electrode so that multiple current paths connect to each electrode. Each gap produces a local ripple in the voltage field which decays away with distance from the gap. Since the ripple decay length is determined by the distance between current paths, the magnitude of the ripple near the electrodes is reduced exponentially by a factor corresponding to the number of gaps per electrode.

L'invention concerne un écran tactile à position résistive ou capacitive qui comprend un substrat de verre doté d'un revêtement résistif uniforme et des chaînes résistives en série d'électrodes distinctes imbriquées adjacentes aux bords périphériques du substrat. Des espaces dans une discontinuité linéaire normalement isolante parallèle à chaque chaîne forment des chemins de courant résistifs sur la zone tactile. Il existe au moins deux espaces par électrode de façon que plusieurs chemins de courant relient chaque électrode. Chaque espace produit une ondulation locale dans le champ de tension qui décline à distance de l'espace. La longueur du déclin de l'ondulation étant déterminée par la distance entre les chemins de courant, l'ampleur de l'ondulation près des électrodes est exponentiellement réduite par un facteur correspondant au nombre d'espaces par électrode.

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