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Tablet integrated with display

  • US 5,418,551 A
  • Filed: 07/12/1993
  • Issued: 05/23/1995
  • Est. Priority Date: 12/19/1988
  • Status: Expired due to Term
First Claim
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1. A tablet integrated with a display comprising:

  • a matrix panel for display, having row and column electrodes;

    a row electrode driver for applying a row scanning pulse successively to every row electrode of the matrix panel;

    a column electrode driver for applying a column scanning pulse successively to every column electrode of the matrix panel and applying a voltage corresponding to display data;

    a detecting conductor, which can be coupled capacitively with the row and column electrodes by contacting the matrix panel, for picking up the row and column scanning pulses from the matrix panel;

    a timing generator for transferring the display data to the column electrode driver and applying timing signals, for determining timings of the row and column scanning pulses, to the row electrode driver and the column electrode driver; and

    row and column coordinate detecting circuits electrically connected to the detecting conductor;

    wherein,during a display mode, the row electrode driver applies the row scanning pulse successively to every row electrode of the matrix panel, and the column electrode driver applies a voltage, in accordance with the display data, simultaneously to the column electrode of the matrix panel each time the row scanning pulse is applied successively to the row electrode of the matrix panel;

    during a row detection mode, the row electrode driver applies the row scanning pulse successively to the row electrodes of the matrix panel, and the row coordinate detecting circuit analyzes the timing of the row scanning pulse picked up by the detecting conductor touching an arbitrary position on the matrix panel, so as to determine the row coordinate of the position which the detecting conductor touches; and

    during a column detection mode, the column electrode driver applies the column scanning pulse successively to the column electrodes of the matrix panel, and the column coordinate detecting circuit analyzes the timing of the column scanning pulse picked up by the detecting conductor touching an arbitrary position on the matrix panel, so as to determine the column coordinate of the position which the detecting conductor touches;

    said tablet integrated with a display further comprising means for effecting said display mode, row detection mode, and column detection mode during alternate periods of time in a time sharing manner.

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