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US 3,971,013 AGranted
Touch keyboard
AssigneeInternational Business Machines Corporation
InventorsFrancis Loyola Challoner, Hemmige Desikachar Varadarajan
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Abstract
A touch operated keyboard comprising an AC driven gas discharge panel display with conductive touch keys located to pick up an AC voltage from the stray field generated by the gas discharge panel is disclosed. A detector detects the drop in AC voltage level of a key due to the proximity of an operator's finger. The touch keys may be deposited upon the surface of the gas panel or upon a separate transparent sheet. The keyboard may be operated to change the information displayed by the gas panel.
Claims10
A touch operated keyboard comprising:
- an AC driven gas discharge panel display;
- at least one conductive touch key located proximate said display to pick up an AC voltage from said stray field generated by the gas discharge panel;
- and
- means to detect the drop in AC voltage level of said at least one key due to the proximity of an operator's finger.
1 more element
Dependencies are inferred from the claim text.