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Display unit having a coordinate input mechanism

  • US 5,633,659 A
  • Filed: 09/19/1994
  • Issued: 05/27/1997
  • Est. Priority Date: 09/17/1993
  • Status: Expired due to Fees
First Claim
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1. A display unit comprising:

  • a flat display comprising M×

    N display elements in a matrix consisting of M rows and N columns, M pieces of Y-electrodes each connected to each of the rows of the display elements, respectively, and N pieces of X-electrodes each connected to each of the columns of the display elements, respectively;

    a detector for detecting, through an electrostatic capacity coupling, a voltage pulse applied to the column and row corresponding to a position on a display surface of said flat display with which said detector is in contact;

    each of said display elements of said flat display being adopted to enter a display state when predetermined voltages are applied to both the Y- and X-electrodes connected to the display element;

    a Y-electrode driver for applying a voltage pulse to the Y-electrodes in a row arrangement order in a display period;

    an X-electrode driver for applying voltage pulses to the N pieces of X-electrodes with a voltage pulse application pattern specified in a given data string;

    means for supplying to said X-electrode driver a data string for specifying a voltage pulse application pattern corresponding to a display pattern to be displayed on the N display elements on a row to which a voltage pulse is applied in a display period;

    means for supplying L data strings for specifying L different voltage pulse application patterns to said X-electrode driver in order in a non-display period;

    Y coordinate detection means for determining a Y coordinate of a position with which said detector is in contact in response to a Y-electrode to which a voltage pulse is applied at a point in time said detector detects the voltage pulse in a display period;

    X coordinate detection means for determining an X coordinate of a position with which said detector is in contact in response to L detection values each indicating whether or not said detector detects a voltage pulse for each of the L voltage pulse application patterns applied to the N pieces of X-electrodes in response to L data strings in a non-display period; and

    said L voltage pulse application patterns containing H voltage application patterns each for applying a voltage pulse to X-electrodes belonging to every other region in an X-electrode arrangement direction in 2×

    k equal regions into which the N pieces of X-electrodes are grouped according to the X-electrode arrangement with respect to H different arbitrary values k in the range of 1 to H (where H≦

    L).

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