Display device with touch detection, drive circuit, driving method, and electronic unit

• US 8,933,351 B2
• Filed: 04/21/2011
• Issued: 01/13/2015
• Est. Priority Date: 04/28/2010
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Noguchi, Koji, Kida, Yoshitoshi, Nakanishi, Takayuki
• Primary Examiner(s): Wang, Quan-Zhen
• Assistant Examiner(s): DICKE, CHAD M
• Application Number:
  US13/091,621
• Publication Number:
  US 20110267295A1
• Time in Patent Office: 1,363 Days
• Field of Search: 178/18.01
• US Class Current: 178/18.06
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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: G09G 3/3674 Details of drivers for scan electrodes
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12

Abstract

A display device includes: a plurality of drive electrodes; a plurality of detection electrodes intersecting the plurality of drive electrodes; and a scan driving unit performing a first scan drive and a second scan drive. The first scan drive allows a display drive signal for driving the display elements to be applied to each of the plurality of common drive electrodes, and the second scan drive allows a touch detection drive signal for detecting an external proximity object to be applied to each of the plurality of common drive electrodes.

Claims

1. A display device with touch detection, comprising:

display elements;

a plurality of common drive electrodes arranged in parallel to extend in one direction;

a plurality of detection electrodes arranged in parallel to extend in a direction which intersects the common drive electrodes and allowing electrostatic capacitance to be formed at each intersection;

a scan driving unit performing a first scan drive and a second scan drive, the first scan drive allowing a display drive signal for driving the display elements to be time-divisionally applied to each of the plurality of common drive electrodes in succession, the second scan drive allowing a touch detection drive signal for detecting an external proximity object to be time-divisionally applied to each of the plurality of common drive electrodes in succession; and

a detection circuit detecting the external proximity object based on a touch detection signal which is outputted from the detection electrode in response to application of the touch detection drive signal or the display drive signal,

wherein

the scan driving unit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, apply the display drive signal to the coincident common drive electrode and to not apply the touch detection drive signal to the coincident common drive electrode, and

when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, drive the respective common drive electrodes so that waveform of the touch detection drive signal transits at a timing within a period accompanied by no waveform transition of the display drive signal, and

the detection circuit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the display drive signal instead of a transition of the waveform of the touch detection drive signal, and

when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the touch detection drive signal.

2. The display device with touch detection according to claim 1, further comprising a pixel signal driving unit supplying a pixel signal to each of the display elements in a display period,

wherein the common drive electrode is driven so that the waveform of the touch detection drive signal transits at a timing out of the display period.

3. The display device with touch detection according to claim 2, wherein the detection circuit performs sampling on the touch detection signal at a preceding timing and a subsequent timing of the waveform transition timing of the touch detection drive signal, and determines the difference between two sampled values.

4. The display device with touch detection according to claim 2, wherein the plurality of common drive electrodes are partitioned into blocks each including a predetermined number of common drive electrodes, and

the scan driving unit drives the plurality of common drive electrodes for each of the blocks.

5. The display device with touch detection according to claim 1, wherein the display drive signal has a rectangular waveform with a polarity inverted for every scan line.

6. The display device with touch detection according to claim 5, wherein the touch detection drive signal is a signal established by shifting a phase of the display drive signal.

7. A display device with touch detection, comprising:

display elements;

a plurality of common drive electrodes arranged in parallel to extend in one direction;

a plurality of detection electrodes arranged in parallel to extend in a direction which intersects the common drive electrodes and allowing electrostatic capacitance to be formed at each intersection;

a scan driving unit performing a first scan drive and a second scan drive, the first scan drive allowing a display drive signal for driving the display elements to be time-divisionally applied to each of the plurality of common drive electrodes in succession, the second scan drive allowing a touch detection drive signal for detecting an external proximity object to be time-divisionally applied to each of the plurality of common drive electrodes in succession; and

a detection circuit detecting the external proximity object based on a touch detection signal which is outputted from the detection electrode in response to application of the touch detection drive signal,

wherein the scan driving unit is configured to, when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, apply the display drive signal to the coincident common drive electrode and to not apply the touch detection drive signal to the coincident common drive electrode,

wherein the scan driving unit drives the common drive electrodes so that a common drive electrode selected to be driven in the first scan drive is not coincident with a common drive electrode selected to be driven in the second scan drive, the scan driving unit drives the respective common drive electrodes so that waveform of the touch detection drive signal transits at a timing within a period accompanied by no waveform transition of the display drive signal, and

wherein the detection circuit is configured to, when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the display drive signal instead of a transition of the waveform of the waveform of the touch detection drive signal.

8. A display device with touch detection, comprising:

a display unit displaying an image, and including display elements, and a common electrode connected to the display elements; and

a touch detecting unit detecting an external proximity object,

the touch detecting unit including;

a plurality of common drive electrodes arranged in parallel to extend in one direction;

a plurality of detection electrodes arranged in parallel to extend in a direction which intersects the common drive electrodes and allowing electrostatic capacitance to be formed at each intersection;

a scan driving unit performing a scan drive of allowing a touch detection drive signal for detecting the external proximity object to be time-divisionally applied to each of the plurality of common drive electrodes in succession; and

a detection circuit detecting the external proximity object based on a touch detection signal which is outputted from the detection electrode in response to application of the touch detection drive signal or the display drive signal,

wherein a unit which is part of the scan driving unit and which provides the display and touch detection signals to the common electrodes, and the scan driving unit drive the common signal and the touch detection drive signal so that waveform of the touch detection drive signal transits at a timing within a period accompanied by no waveform transition of the common signal,

wherein the scan driving unit is configured to, when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, apply the display drive signal to the coincident common drive electrode and to not apply the touch detection drive signal to the coincident common drive electrode,

wherein the detection circuit is configured to, when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the display drive signal instead of a transition of the waveform of the touch detection drive signal, and

wherein the detection circuit is configured to detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the touch detection drive signal.

9. A drive circuit comprising:

a scan driving unit performing a first scan drive and a second scan drive on a display unit with touch detection, the display unit with the touch detection including display elements, a plurality of common drive electrodes arranged in parallel to extend in one direction, and a plurality of detection electrodes arranged in parallel to extend in a direction which intersects the common drive electrodes and allowing electrostatic capacitance to be formed at each intersection, the first scan drive allowing a display drive signal for driving the display elements to be time-divisionally applied to each of the plurality of common drive electrodes in succession, and the second scan drive allowing a touch detection drive signal for detecting an external proximity object to be time-divisionally applied to each of the plurality of common drive electrodes in succession;

a control unit controlling the scan driving unit; and

a detection circuit detecting the external proximity object based on a touch detection signal which is outputted from the detection electrode in response to application of the touch detection drive signal or the display drive signal,

wherein the scan driving unit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, apply the display drive signal to the coincident common drive electrode and to not apply the touch detection drive signal to the coincident common drive electrode, and,

when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, apply the respective common drive electrodes so that waveform of the touch detection drive signal transits at a timing within a period accompanied by no waveform transition of the display drive signal, and

the detection circuit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the display drive signal instead of a transition of the waveform of the touch detection drive signal, and

when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the touch detection drive signal.

10. A driving method, comprising:

performing a first scan drive on the display unit with touch detection; and

performing a second scan drive on the display unit with the touch detection,

the display unit with the touch detection including display elements, a plurality of common drive electrodes arranged in parallel to extend in one direction, and a plurality of detection electrodes arranged in parallel to extend in a direction which intersects the common drive electrodes and allowing electrostatic capacitance to be formed at each intersection, the first scan drive allowing a display drive signal for driving the display elements to be time-divisionally applied to each of the plurality of common drive electrodes in succession, and the second scan drive allowing a touch detection drive signal for detecting an external proximity object to be time-divisionally applied to each of the plurality of common drive electrodes in succession,

wherein

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, the display drive signal is applied to the coincident common drive electrode and the touch detection drive signal is not applied to the coincident common drive electrode, and the external proximity object is detected based on a change of a touch detection signal upon transition of the waveform the display drive signal instead of a transition of the waveform the touch detection drive signal,

wherein when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, the respective common drive electrodes are driven so that waveform of the touch detection drive signal transits at a timing within a period accompanied by no waveform transition of the display drive signal and the external proximity object is detected based on a change of the touch detection signal upon transition of the waveform of the touch detection drive signal.

11. An electronic unit comprising:

a display device with touch detection; and

a control unit performing an operation control that utilizes the display device with the touch detection,

the display device with the touch detection including;

display elements;

a plurality of common drive electrodes arranged in parallel to extend in one direction;

a plurality of detection electrodes arranged in parallel to extend in a direction which intersects the common drive electrodes and allowing electrostatic capacitance to be formed at each intersection;

a scan driving unit performing a first scan drive and a second scan drive, the first scan drive allowing a display drive signal for driving the display elements to be time-divisionally applied to each of the plurality of common drive electrodes in succession, the second scan drive allowing a touch detection drive signal for detecting an external proximity object to be time-divisionally applied to each of the plurality of common drive electrodes in succession; and

a detection circuit detecting the external proximity object based on a touch detection signal which is outputted from the detection electrode in response to application of the touch detection drive signal or the display drive signal,

wherein

the scan driving unit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, apply the display drive signal to the coincident common drive electrode and to not apply the touch detection drive signal to the coincident common drive electrode, and

when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, drive the respective common drive electrodes so that waveform of the touch detection drive signal transits at a timing within a period accompanied by no waveform transition of the display drive signal, and

the detection circuit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the display drive signal instead of a transition of the waveform of the touch detection drive signal, and

when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the touch detection drive signal.

12. A display device comprising:

a plurality of drive electrodes;

a plurality of detection electrodes intersecting the plurality of drive electrodes;

a scan driving unit performing a first scan drive and a second scan drive, the first scan drive allowing a display drive signal for driving the display elements to be applied to each of a plurality of common drive electrodes, the second scan drive allowing a touch detection drive signal for detecting an external proximity object to be applied to each of the plurality of common drive electrodes; and

a detection circuit detecting an external proximity object based on a touch detection signal which is outputted from the detection electrode in response to application of the touch detection drive signal or the display drive signal,

wherein

the scan driving unit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a drive electrode selected to be driven in the second scan drive, apply the display drive signal to the coincident common drive electrode and to not apply the touch detection drive signal to the coincident common drive electrode, and

when a common drive electrode selected to be driven in the first scan drive is different from a drive electrode selected to be driven in the second scan drive, drive the respective drive electrodes so that waveform of the touch detection drive signal transits at a timing within a period accompanied by no waveform transition of the display drive signal, and

the detection circuit is configured to,

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the display drive signal instead of a transition of the waveform of the touch detection drive signal, and

when a common drive electrode selected to be driven in the first scan drive is different from a common drive electrode selected to be driven in the second scan drive, detect the external proximity object based on a change of the touch detection signal upon transition of the waveform of the touch detection drive signal.

13. A display device comprising:

a plurality of drive electrodes;

a plurality of detection electrodes intersecting the plurality of drive electrodes;

a scan driving unit performing a first scan drive and a second scan drive, the first scan drive allowing a display drive signal to be applied to each of the plurality of common drive electrodes, the second scan drive allowing a touch detection drive signal to be applied to each of the plurality of common drive electrodes at a scan interval different from that of the display drive signal in the first scan drive; and

a detection circuit detecting an external proximity object based on a touch detection signal which is outputted from the detection electrode in response to application of the touch detection drive signal or the display drive signal,

wherein

when a common drive electrode selected to be driven in the first scan drive is coincident with a common drive electrode selected to be driven in the second scan drive, the scan driving unit applies the display drive signal to the coincident common drive electrode and does not apply the touch detection drive signal to the coincident drive electrode, and the detection circuit detects the external proximity object based on a change of the touch detection signal upon transition of the waveform of the display drive signal instead of a transition of the waveform of the touch detection drive signal.