Display unit having a coordinate input mechanism

A display unit comprising:

• a flat display comprising M.times.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, through an electrostatic capacity coupling, for detecting 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 by judging an X-electrode range with which said detector is in contact in order in response to 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 consisting of:
• one voltage application pattern for applying a voltage pulse to X-electrodes belonging to one of two equal regions into which the N pieces of X-electrodes are grouped according to X-electrode arrangement;
• and
• H-1 voltage application patterns each for applying a voltage pulse to X-electrodes belonging to one of two equal regions into which the range judged to be in contact with said detector in detection for the preceding voltage application pattern is divided according to X-electrode arrangement while value k is incremented by one from 2 to H (where H.ltoreq.L) in order.

A display unit comprising:

• a flat display comprising M.times.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 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 through an electrostatic capacity coupling;
• 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 and an X coordinate represented by an A-bit value in binary notation is given to each of the columns;
• 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 to said X-electrode driver, data strings for specifying L voltage pulse application patterns containing H voltage pulse application patterns for applying a voltage pulse only to either of an X-electrode having a given X coordinate whose jth most significant bit has value `1` and an X-electrode having a given X coordinate whose jth most significant bit has value `0` in order with respect to H different arbitrary values j in the range of 1 to H (where H.ltoreq.A) 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;
• and
• X coordinate detection means for determining the bit value of the jth most significant bit of the X coordinate of a position with which said detector is in contact in response to whether or not said detector detects a voltage pulse for the voltage pulse application pattern corresponding to the value of the j for each of the H values j in a non-display period.

A display unit comprising:

• a flat display comprising M.times.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 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 through an electrostatic capacity coupling;
• 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 and an X coordinate represented by an A-bit value in binary notation is given to each of the columns;
• 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 to said X-electrode driver, data strings for specifying L voltage pulse application patterns containing H voltage pulse application patterns each corresponding to each of H values j incremented by one in the range of 1 to H (where H.ltoreq.A) 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 the bit value of the jth most significant bit of the X coordinate of a position with which said detector is in contact in response to whether or not said detector detects a voltage pulse for the voltage pulse application pattern corresponding to the value of the j for each of the H values j incremented by one in a non-display period;
• the voltage pulse application pattern corresponding to j which is 1 is a pattern for applying a voltage pulse to either of an X-electrode having a given X coordinate whose most significant bit has value `1` and an X-electrode having a given X coordinate whose most significant bit has value `0`;
• and
• said voltage pulse application patterns corresponding to j of 2 to H being each a pattern, with respect to the corresponding j, for applying a voltage pulse to an X-electrode which is either of an X-electrode having a given X coordinate whose jth most significant bit has value `1` and an X-electrode having a given X coordinate whose jth most significant bit has value `0`, with the value of the most significant bit to the (j-1)th most significant bit of the given X coordinate being equal to the value determined as the bit value of the most significant bit to the (j-1)th most significant bit of the X coordinate of the position with which the detector is in contact.

A display unit comprising:

• two flat displays each comprising M.times.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 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 through an electrostatic capacity coupling;
• said two flat displays being placed so as to make up one screen;
• 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 and an X coordinate represented by an A-bit value in binary notation is given to each of the columns;
• a Y-electrode driver for applying a voltage pulse to the Y-electrodes for corresponding rows of said two flat displays in parallel in a row arrangement order in a display period;
• two X-electrode drivers being disposed corresponding to said two flat displays, said two X-electrode drivers each for applying voltage pulses to the N pieces of X-electrodes of the corresponding flat display with a voltage pulse application pattern specified in a given data string;
• means for supplying to each of said two X-electrode drivers 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 of the corresponding flat display to which a voltage pulse is applied in a display period;
• means for supplying to one of said two X-electrode drivers a data string for applying voltage pulses to all X-electrodes of the corresponding flat display, and supplying to the other X-electrode driver a data string for suppressing voltage pulse application to all X-electrodes of the corresponding flat display in a non-display period;
• and
• Y coordinate detection means for determining a position in the flat display 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, and determining a Y coordinate on said screen with which said detector is in contact by judging that the flat display having all X-electrodes to which voltage pulses are applied, at a point in time said detector detects voltage pulse in a non-display period, is the flat display with which said detector is in contact.