DISPLAY DEVICE PROVIDED WITH SENSOR AND METHOD OF DRIVING THE SAME

• US 20150220208A1
• Filed: 01/21/2015
• Published: 08/06/2015
• Est. Priority Date: 01/31/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: NOGUCHI, Koji, Mizuhashi, Hiroshi
• Granted Patent: US 9,785,283 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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 which is provided in the display panel is also used as one of the electrodes for the touch sensor, and

the electrodes for the touch sensor are driven by a self-detection method, and

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.

2. The display device provided with the sensor according to claim 1, wherein the common electrode COME is located parallel to the source lines in the display panel.

3. The display device provided with the sensor according to claim 2, wherein when the common electrode is driven by the self-detection method, the source lines and the gate lines in the display panel are made in a floating state.

4. The display device provided with the sensor according to claim 2, wherein when the common electrode is driven by the self-detection method, the gate lines in the display panel float, and the source lines in the display panel are driven by a signal identical to a drive signal supplied to the common electrode.

5. The display device provided with the sensor according to claim 2, when the common electrode is driven by the self-detection method, the source lines and the gate lines in the display panel are driven by a signal identical to a drive signal supplied to the common electrode.

6. The display device provided with the sensor according to claim 2, wherein the electrodes for the touch sensor are driven by one of the self-detection method and the mutual detection method, which is selected by switching.

7. The display device provided with the sensor according to claim 1, wherein when the common electrode COME is driven by the self-detection method, the source lines and the gate lines in the display panel are made in a floating state.

8. The display device provided with the sensor according to claim 1, when the common electrode is driven by the self-detection method, the gate lines in the display panel are made in a floating state, and the source lines in the display panel are driven by a signal identical to a drive signal supplied to the common electrode.

9. The display device provided with the sensor according to claim 1, wherein the common electrode is driven by the self-detection method, the source lines and the gate lines in the display panel are driven by a signal identical to a drive signal supplied to the common electrode.

10. 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 electrode.

11. The display device provided with the sensor according to claim 10, wherein the switching circuit is provided at an end portion of the display panel in an extending direction of the common electrode.

12. 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 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, the method comprising;

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

driving the electrodes for the touch sensor with the self-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.

13. 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 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; 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; and

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 being configured to effect switching between the self-detection method and the mutual detection method, with at least one of the plurality of electrodes for the touch sensor.

14. The display device provided with the sensor, according to claim 13, wherein in the self-detection method, a detection operation is performed in each of the detection electrodes in the lower surface of the display panel.

15. The display device with the sensor, according to claim 13, wherein 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 one of the row and column directions 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 other of the row and column directions, and are arranged in the manner of stripes.

16. The display device with the sensor, according to claim 13, wherein as viewed in a plan view, of the electrodes for the touch sensor provided in the upper surface, the electrodes arranged in the manner of stripes are located between adjacent ones of the detection electrodes provided in the lower surface.