Compact universal keyboard

Computer graphics processing and selective visual display system – Display peripheral interface input device – Including keyboard

Reexamination Certificate

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Details

C341S022000, C400S485000

Reexamination Certificate

active

07439957

ABSTRACT:
A keyboard type input device has multiple key positions provided as character entry keys. Each key corresponds to one key in the selected row of the conventional QWERTY keyboard. A second set of control buttons provide for the selection of which row of a conventional QWERTY keyboard are represented by the character keys in addition to other functions such as case shift, and alpha-numerical control functions. A selected row is shown on a display, as visual feedback. Alternatively the keys are implemented as LCDs with pressure sensors and the characters of the selected row are displayed directly on the corresponding key positions. The keyboard finds particular use in portable devices as it demands less space than traditional keyboards. The keyboard type input device is implemented with various electronic appliances, including portable phones.

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“Keyboard for Handheld Computer,”IBM Technical Disclosure Bulletin, vol. 27, No. 10A, Mar. 1985.

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