Display-integrated type tablet device

A display-integrated type tablet device having:

• a display panel, in which display-use material is sandwiched between segment electrodes and common electrodes, orthogonally crossing each other, and which is driven by a duty-type drive method;
• a detection pen having at its tip an electrode to be electrostatically coupled with the segment electrodes and the common electrodes of the display panel;
• a segment drive circuit for driving the segment electrodes;
• a common drive circuit for driving the common electrodes;
• a display control circuit for controlling the segment drive circuit and the common drive circuit during a display period to display an image onto the display panel;
• a detection control circuit for controlling the segment drive circuit during a coordinate detection period to successively scan the segment electrodes of the display panel while controlling the common drive circuit to successively scan the common electrodes;
• an x-coordinate detection circuit for detecting the x-coordinate on the display panel specified by the tip of the detection pen from both the timing at which an output signal from the detection pen is generated and the timing at which the segment electrodes are scanned;
• and a y-coordinate detection circuit for detecting the y-coordinate on the display panel specified by the tip of the detection pen from both the time at which an output signal from the detection pen is generated and the timing at which the common electrodes are scanned, wherein
• the segment electrodes are divided into two, one side segment electrodes belonging to one half region on one side of the display panel and the other side segment electrodes belonging to the other half region on the other side opposite to the aforementioned one side;
• the common electrodes are divided into two, one side common electrodes belonging to one half region on one side of the display panel and the other side common electrodes belonging to the other side half region opposite to the aforementioned one side;
• one of the segment drive circuit and the common drive circuit is composed of a one side drive circuit for driving the one side electrodes and the other side drive circuit for driving the other side electrodes;
• the drive circuit, other than the one composed of a one side drive circuit and the other side drive circuit, having the one side electrodes and the other side electrodes connected thereto in parallel and in conjunction with each other;
• the one side drive circuit and the other side drive circuit are so arranged that they generate a scan signal having a scan pulse of a voltage that does not contribute to display of the display panel depending on an external control signal during a coordinate detection period and they deliver the scan signal to all the electrodes to be driven at the same timing;
• the x-coordinate detection circuit is so arranged that it detects the region on the display panel in which the tip of the detection pen exists, from both the timing at which a scan signal having a scan pulse of a voltage that does not contribute to the display from the one side drive circuit and the other side drive circuit from the detection pen is generated and further from the peak value of the output signal while the y-coordinate detection circuit is so arranged that it detects the region on the display panel in which the tip of the detection pen exists, from both the timing at which a scan signal having a scan pulse of a voltage that does not contribute to the display from the one side drive circuit and the other side drive circuit is inputted and the timing at which an output signal from the detection pen is generated and further from the peak value of the output signal, whereby
• it is detected whether the tip of the detection pen exists in the one side half region of the display panel or in the other side half region thereof.

A display-integrated type tablet, comprising:

• a duty-type display panel, in which a display material is disposed between segment electrodes and common electrodes, the segment electrodes being divided into first segment electrodes and second segment electrodes at approximately center of a display screen;
• a first segment drive circuit for driving the first segment electrodes, one side terminals of said first segment electrodes being electrically connected to the first segment drive circuit, while the other side terminals of said first segment electrodes being opened;
• a second segment drive circuit for driving the second segment electrodes, one side terminals of said second segment electrodes being electrically connected to the second segment drive circuit, while the other side terminals of said second segment electrodes being opened;
• a common drive circuit for driving the common electrodes, one side terminals of said common electrodes being electrically connected to the common drive circuit, while the other side terminals of said common electrodes being opened;
• a display control circuit for, during a display period, controlling the first segment drive circuit, the second segment drive circuit and the common drive circuit to cause the display panel to simultaneously effect the display of the upper half and the display of the lower half of the display panel;
• a position detection control circuit for, during a position detection period, controlling the first segment drive circuit to successively apply first segment scan signals to the one side terminals of the first segment electrodes for x-coordinate detection, for controlling the second segment drive circuit to successively apply second segment scan signals to the one side terminals of the second segment electrodes for x-coordinate detection, and for controlling the common drive circuit to successively apply common scan signals to the one side terminals of the common electrodes for y-coordinate detection;
• a position detection pen to be electrostatically coupled with the first segment electrodes, the second segment electrodes, and the common electrodes;
• and a coordinate detection circuit for detecting coordinates of a position on the display panel specified by the position detection pen depending on an output signal of the position detection pen.

A display-integrated type tablet having:

• a display panel having first electrodes and second electrodes;
• a first drive circuit for applying voltage to the first electrodes;
• a second drive circuit for applying voltage to the second electrodes;
• a detection pen to be electrostatically coupled with the first electrodes and the second electrodes;
• and means for amplifying an electrostatically induced voltage of the detection pen, wherein carried out by time sharing are display of an image with the display panel and coordinate detection for determining a position of the detection pen according to the electrostatically induced voltage, characterized in that
• the first drive circuit is provided with a plurality of driving integrated circuits connected in cascade by serial input/output terminals, the driving integrated circuits comprising:
• scan mode setting means for setting scan mode of the driving integrated circuits to a first mode for a display period and to a second mode for a coordinate detection period;
• the serial input/output terminal;
• a data input terminal for receiving display data during the display period;
• a shift data input/output terminal for receiving shift data during the coordinate detection period;
• a memory for memorizing data inputted from the data input terminal;
• a shift register for shifting the shift data inputted from the shift data input/output terminal;
• a driver for generating scan signals based on the shift data and the display data and outputting the scan signals to the first electrodes;
• and control means, wherein the control means cause the memory to memorize, in the first mode, the display data inputted from the data input terminal and thereafter to output the display data to the driver simultaneously in parallel, while the control means cause the shift register to shift and output, in the second mode, shift data inputted through the shift data input/output terminal to the driver so that the scan signal on the shift data can be successively serially inputted from the driver to the first electrodes.

A display-integrated type tables device having:

• a display panel, in which display-use material is sandwiched between segment electrodes and common electrodes, orthogonally crossing each other, and which is driven by a duty-type drive method;
• a detection pen having at its tip an electrode to be electrostatically coupled with the segment electrodes and the common electrodes of the display panel;
• a segment drive circuit for driving the segment electrodes;
• a common drive circuit for driving the common electrodes;
• a display control circuit for controlling the segment drive circuit and the common drive circuit during a display period to display an image onto the display panel;
• a detection control circuit for controlling the segment drive circuit during a coordinate detection period to successively scan the segment electrodes of the display panel while controlling the common drive circuit to successively scan the common electrodes;
• an x-coordinate detection circuit for detecting the x-coordinate on the display panel specified by the tip of the detection pen from both the timing at which an output signal from the detection pen is generated and the timing at which the segment electrodes are scanned;
• and a y-coordinate detection circuit for detecting the y-coordinate on the display panel specified by the tip of the detection pen from both the timing at which an output signal from the detection pen is generated and the timing at which the common electrodes are scanned, wherein the segment electrodes are divided into two, one side segment electrodes belonging to one half region on one side of the display panel and the other side segment electrodes belonging to the other half region on the other side opposite to the aforementioned one side;
• the common electrodes are divided into two, one side common electrodes belonging to one half region on the one side of the display panel and the other side common electrodes belonging to the other half region on the aforementioned other side;
• the segment drive circuit is composed of a one side segment drive circuit for driving the one side segment electrodes and the other side segment drive circuit for driving the other side segment electrodes;
• the common drive circuit is composed of a one side common drive circuit for driving the one side common electrodes and the other side common drive circuit for driving the other side common electrodes;
• the one side common drive circuit and the other side common drive circuit have a shift register and
• a shift data feed path switching circuit for switching a shift data feed path so that shift data are inputted, in parallel mode, simultaneously into the two shift registers of the one side common drive circuit and the other side common drive circuit, both having the aforementioned shift registers;
• while shift data are inputted in serial mode, first only into the shift register of the one side common drive circuit, thereafter the shift data are outputted from the shift register of a final stage of the one side common drive circuit, and simultaneously or thereafter the shift data are inputted into the shift register of the other side common drive circuit;
• whereby;
• the one side common drive circuit and the other side common drive circuit are driven in parallel in the parallel mode;
• the one side common drive circuit an the other side common drive circuit are driven in series in the serial mode, by switching of the shift data feed path effected by the shift data feed path switching circuit.

A display-integrated type tablet device having:

• a display panel, in which display-use material is sandwiched between segment electrodes and common electrodes, orthogonally crossing each other, and which is driven by a duty-type drive method;
• a detection pen having at is tip an electrode to be electrostatically coupled with the segment electrodes and the common electrodes of the display panel;
• a segment drive circuit for driving the segment electrodes;
• a common drive circuit for driving the common electrodes;
• a display control circuit for controlling the segment drive circuit and the common drive circuit during a display period to display an image onto the display;
• a detection control circuit of controlling the segment drive circuit during a coordinate detection period to successively scan the segment electrodes of the display panel, while controlling the common drive circuit to successively scan the common electrodes;
• an x-coordinate detection circuit for detecting the x-coordinate on the display panel specified by the tip of the detection pen from both the timing at which an output signal from the detection pen is generated and the timing at which the segment electrodes are scanned;
• and a y-coordinate detection circuit for detecting the y-coordinate on the display panel specified by the tip of the detection pen from both the timing at which an output signal from the detection pen is generated and the timing at which the common electrodes are scanned, wherein
• the segment electrodes are divided into two, one side segment electrodes belonging to one half region on one side of the display panel and the other side segment electrodes belonging to the other half region on the other side opposite to the aforementioned one side, said one side segment electrodes being opposed to the other side segment electrodes in such a manner that the one side segment electrodes and the other side segment electrodes lie on parallel straight lines;
• the segment drive circuit is composed of a one side segment drive circuit for driving the one side segment electrodes and the other side segment drive circuit for driving the other side segment electrodes, wherein the one side segment drive circuit and the other side segment drive circuit have the same structure, shape and dimension, and are opposed to each other, and yet have respectively a directional shift register provided with a control terminal for setting a shifting direction,
• whereby the one side segment electrodes and the other side segment electrodes are serially scanned in the same direction during the coordinate detection period by controlling the control terminals of the one side segment drive circuit and the other side segment drive circuit.