Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1993-07-12
1995-05-23
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
178 19, G09G 302
Patent
active
054185513
ABSTRACT:
A tablet integrated with a display is provided comprising a matrix panel having row and column electrodes, a detecting conductor, a row electrode driver, a column electrode driver, and row and column coordinate detecting circuits. In a display mode, the row electrode driver applies a row scanning pulse successively to each row electrode of the matrix panel, and the column electrode driver simultaneously applies a display voltage to each column electrode of the matrix panel each time a corresponding row scanning pulse is applied. In a row detection mode, the row electrode driver applies the row scanning pulse successively to each row electrode of the matrix panel, and analyzes the timing of the row scanning pulse detected by a detecting conductor touching the matrix panel, so as to determine the row coordinate of the position of the detecting conductor. In a column detection mode, the column electrode driver applies the column scanning pulse successively to each column electrode of the matrix panel, and the column coordinate detecting circuit analyzes the timing of the column scanning pulse detected by the detecting conductor touching the matrix panel, so as to determine the column coordinate of the detecting conductor.
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IEEE Communications Magazine, Jul. 1986, vol. 24, No. 7, pp. 18-23.
Liang Regina
Sharp Kabushiki Kaisha
Weldon Ulysses
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