Display device provided with sensor and method of driving the same

• US 9,785,283 B2
• Filed: 01/21/2015
• Issued: 10/10/2017
• Est. Priority Date: 01/31/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Koji, Mizuhashi, Hiroshi
• Primary Examiner(s): Ghebretinsae, Temesghen
• Assistant Examiner(s): Quiles, Ivelisse Martinez
• Application Number:
  US14/601,555
• Publication Number:
  US 20150220208A1
• Time in Patent Office: 993 Days
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

According to one embodiment, a display device with a sensor, includes a pair of electrodes for a touch sensor, which are provided to extend to intersect, and a display panel which includes a plurality of display elements arranged in a matrix, a plurality of gate lines extending along display elements of the display elements which are arranged in a row direction, and a plurality of source lines extending along display elements of the display elements which are arranged in a column direction, wherein a common electrode for display provided in the display panel is also used as one of the electrodes for the touch sensor, the electrodes for the touch sensor are driven by the self-detection method, and an image display operation of the display panel and a drive operation of the electrodes for the touch sensor are performing in a time sharing manner.

Claims

1. A display device provided with a sensor, comprising:

a pair of electrodes for a touch sensor, which are provided to extend to intersect; and

a display panel which includes a plurality of display elements arranged in a matrix, a plurality of gate lines extending along display elements of the plurality of display elements which are arranged in a row direction, and a plurality of source lines extending along display elements of the plurality of display elements which are arranged in a column direction, wherein

common electrodes for display which are provided in the display panel are also used as one of the electrodes for the touch sensor,

the electrodes for the touch sensor are selectively driven by one of a self-detection method and a mutual detection method,

an image display operation of the display panel and a driving operation of the electrodes for the touch sensor are performed in a time sharing manner,

the common electrodes are located parallel to the source lines in the display panel, and extend continuously over pixels in a same direction as a direction in which the source lines extend,

when the common electrodes are driven by the self-detection method,

the gate lines provided in the display panel are switched to a floating state;

the source lines are driven by a signal identical to a drive signal supplied to the common electrodes; and

the common electrodes and the source lines are electrically connected and driven,

the display device provided with the sensor further includes circuits, each of which supplies the drive signal to a corresponding common electrode of the common electrodes,

each of the circuits includes;

a first switch configured to switch a connection between the corresponding common electrode and a touch panel integrated circuit;

a second switch configured to switch a connection between the corresponding common electrode and an alternating-current signal line;

a third switch configured to switch a connection between the corresponding common electrode and a direct-current signal line; and

a fourth switch configured to switch a connection between the corresponding common electrode and the source lines,

in the self-detection method, in each of the circuits, the corresponding common electrode and the source lines are connected via the fourth switch, and the drive signal is input to the corresponding common electrode from the touch panel integrated circuit via the first switch, and

in the mutual detection method,

the drive signal is input sequentially from the circuits to the common electrodes;

in a circuit of the circuits which outputs the drive signal, the corresponding common electrode and the source lines are connected via the fourth switch, and an alternating-current signal is input to the corresponding common electrode from the alternating-current signal line via the second switch; and

in a circuit of the circuits which does not output the drive signal, the corresponding common electrode and the source lines are disconnected by the fourth switch, and a direct-current signal is input to the corresponding common electrode from the direct-current signal line via the third switch.

2. The display device provided with the sensor according to claim 1, further comprising a switching circuit configured to effect, when the display device is operated in one of an image display mode, a self-detection mode, and a mutual detection mode, switching to source lines associated with the one of the modes, to supply a signal to the common electrodes.

3. The display device provided with the sensor according to claim 2, wherein the switching circuit is provided at an end portion of the display panel in an extending direction of the common electrodes.

4. A method of driving a display device provided with a sensor, which comprises:

a pair of electrodes for a touch sensor, which are provided to extend to intersect; and

a display panel which includes a plurality of display elements arranged in a matrix, a plurality of gate lines extending along display elements of the plurality of display elements which are arranged in a row direction, and a plurality of source lines extending along display elements of the plurality of display elements which are arranged in a column direction, the method comprising;

using common electrodes for display, which are provided in the display panel, as one of the electrodes for the touch sensor;

selectively driving the electrodes for the touch sensor by one of a self-detection method and a mutual detection method; and

performing an image display operation of the display panel and a drive operation of the electrode for the touch sensor in a time sharing manner, wherein

the common electrodes are located parallel to the source lines in the display panel, and extend continuously over pixels in a same direction as a direction in which the source lines extend,

when the common electrodes are driven by the self-detection method,

the gate lines provided in the display panel are switched to a floating state;

the source lines are driven by a signal identical to a drive signal supplied to the common electrodes; and

the common electrodes and the source lines are electrically connected and driven,

the display device provided with the sensor further includes circuits, each of which supplies the drive signal to a corresponding common electrode of the common electrodes,

each of the circuits includes;

a first switch configured to switch a connection between the corresponding common electrode and a touch panel integrated circuit;

a second switch configured to switch a connection between the corresponding common electrode and an alternating-current signal line;

a third switch configured to switch a connection between the corresponding common electrode and a direct-current signal line; and

a fourth switch configured to switch a connection between the corresponding common electrode and the source lines,

in the self-detection method, in each of the circuits, the corresponding common electrode and the source lines are connected via the fourth switch, and the drive signal is input to the corresponding common electrode from the touch panel integrated circuit via the first switch, and

in the mutual detection method,

the drive signal is input sequentially from the circuits to the common electrodes;

in a circuit of the circuits which outputs the drive signal, the corresponding common electrode and the source lines are connected via the fourth switch, and an alternating-current signal is input to the corresponding common electrode from the alternating-current signal line via the second switch; and

in a circuit of the circuits which does not output the drive signal, the corresponding common electrode and the source lines are disconnected by the fourth switch, and a direct-current signal is input to the corresponding common electrode from the direct-current signal line via the third switch.

5. A display device provided with a sensor, comprising:

a display panel which includes a plurality of display elements arranged in a matrix, a plurality of gate lines extending along display elements of the plurality of display elements which are arranged in a row direction, and a plurality of source lines extending along display elements of the plurality of display elements which are arranged in a column direction; and

a plurality of electrodes for a touch sensor, which are incorporated in the display panel and also provided in both upper and lower surfaces of the display panel,

wherein;

the electrode for the touch sensor provided in the upper surface of the display panel includes electrodes arranged in a manner of stripes and extending in a single direction;

the electrode for the touch sensor provided in the lower surface of the display panel includes a plurality of detection electrodes arranged in a matrix and lead lines connected to the detection electrodes, respectively;

the electrode for the touch sensor provided in the lower surface of the display panel is also used as a common electrode for display which is provided in the display panel;

an image display operation of the display panel and a drive operation of the electrodes for the touch sensor are performed in a time sharing manner;

the display device with the sensor is selectively driven by one of a self-detection method and a mutual detection method in a single frame time period with at least one of the plurality of electrodes for the touch sensor;

in the self-detection method, a detection operation is performed in each of the detection electrodes in the lower surface of the display panel;

in the mutual detection method, a detection operation is performed with a plurality of electrodes of the detection electrodes in the electrode for the touch sensor provided in the lower surface, which are electrically connected in series in the column direction and are arranged in a manner of stripes, and also a plurality of electrodes in the electrode for the touch sensor provided in the upper surface, which are provided to extend in the row direction, and are arranged in the manner of stripes;

when the detection electrodes are driven by the self-detection method,

the gate lines provided in the display panel are switched to a floating state,

the source lines are driven by a signal identical to a drive signal supplied to the detection electrodes, and

the detection electrodes and the source lines are electrically connected and driven;

the display device provided with the sensor further includes circuits, each of which supplies the drive signal to a corresponding detection electrode of the detection electrodes;

each of the circuits includes;

a first switch configured to switch a connection between the corresponding detection electrode and a touch panel integrated circuit,

a second switch configured to switch a connection between the corresponding detection electrode and an alternating-current signal line,

a third switch configured to switch a connection between the corresponding detection electrode and a direct-current signal line, and

a fourth switch configured to switch a connection between the corresponding detection electrode and the source lines;

in the self-detection method, in each of the circuits, the corresponding detection electrode and the source lines are connected via the fourth switch, and the drive signal is input to the corresponding detection electrode from the touch panel integrated circuit via the first switch; and

in the mutual detection method,

the drive signal is input sequentially from the circuits to the detection electrodes,

in a circuit of the circuits which outputs the drive signal, the corresponding detection electrode and the source lines are connected via the fourth switch, and an alternating-current signal is input to the corresponding detection electrode from the alternating-current signal line via the second switch, and

in a circuit of the circuits which does not output the drive signal, the corresponding detection electrode and the source lines are disconnected by the fourth switch, and a direct-current signal is input to the corresponding detection electrode from the direct-current signal line via the third switch.