Display apparatus with touch detection function, drive circuit, method of driving display apparatus with touch detection function, and electronic devices

• US 9,619,069 B2
• Filed: 06/23/2015
• Issued: 04/11/2017
• Est. Priority Date: 08/23/2010
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Nakanishi, Takayuki, Mizuhashi, Hiroshi
• Primary Examiner(s): Dicke, Chad
• Application Number:
  US14/747,689
• Publication Number:
  US 20150293638A1
• Time in Patent Office: 658 Days
• Field of Search: 345103, 345173-178
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• 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 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 2310/0218 with collection of electrodes in groups for n-dimensional addressing
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A display apparatus with a touch detection function, includes: a plurality of common drive electrodes disposed in parallel so as to extend in one direction; a display element displaying on the basis of a pixel signal and a display drive signal; a touch detection element detecting an external approaching object on the basis of a touch-detection drive signal; and a scan drive section performing first scan driving to apply the display drive signal to the plurality of common drive electrodes sequentially by time division and second scan driving having a scan speed different from a scan speed of the first scan driving to apply the touch-detection drive signal to the plurality of common drive electrodes sequentially by time division, wherein the scan drive section drives the common drive electrodes for each plurality of the electrodes in the first and the second scan driving.

Claims

1. A display device comprising:

a row(n−

2) of pixels electrically connected to a drive electrode(n−

2), wherein during time period(t−

1), a scan drive section is configured to set a scan signal line GCL(n−

1) at a first logic level while outputting a first voltage level onto the drive electrode(n−

2), a drive electrode(n−

1), and a drive electrode(n);

a row(n−

1) of the pixels electrically connected to the drive electrode(n−

1) and the scan signal line GCL(n−

1), wherein during time period(t), the scan drive section is configured to set a scan signal line GCL(n) at the first logic level while outputting a second voltage level onto the drive electrode(n−

1), a drive electrode(n), and a drive electrode(n+1);

a row(n) of the pixels electrically connected to the drive electrode(n) and the scan signal line GCL(n), wherein during time period(t+1), the scan drive section is configured to set a scan signal line GCL(n+1) at the first logic level while outputting the first voltage level onto the drive electrode(n), a drive electrode(n+1), and a drive electrode(n+2);

a row(n+1) of the pixels electrically connected to the drive electrode(n+1) and the scan signal line GCL(n+1), wherein the scan drive section is configured to output a voltage level other than the first voltage level onto the drive electrode(n−

2) when the scan signal line GCL(n+1) is at the first logic level; and

a row(n+2) of the pixels electrically connected to the drive electrode(n+2), wherein the row(n+1) of the pixels is between the row(n) of the pixels and the row(n+2) of the pixels.

2. The display device according to claim 1, wherein the scan drive section is configured to transition the scan signal line GCL(n−

1) from a second logic level to a first logic level before transitioning the scan signal line GCL(n) from the second logic level to the first logic level.

3. The display device according to claim 2, wherein the first logic level is a high logic level and the second logic level is a low logic level.

4. The display device according to claim 2, wherein the scan drive section is configured to transition the scan signal line GCL(n) from the second logic level to the first logic level before transitioning the scan signal line GCL(n+1) from the second logic level to the first logic level.

5. The display device according to claim 1, wherein the first voltage level differs from the second voltage level.

6. The display device according to claim 1, wherein the first voltage level is higher than a reference level and the second voltage level is lower than the reference level.

7. The display device according to claim 6, wherein the second voltage level is inverted from the first voltage level with respect to the reference level.

8. The display device according to claim 6, wherein the reference level is a direct current drive signal.

9. The display device according to claim 6, wherein the reference level is the voltage level other than the first voltage level.

10. The display device according to claim 1, wherein the second voltage level is the voltage level other than the first voltage level.

11. The display device according to claim 1, wherein the row(n−

1) of the pixels is between the row(n−

2) of the pixels and the row(n) of the pixels, the row(n) of the pixels is between the row(n−

1) of the pixels and the row(n+1) of the pixels.

12. The display device according to claim 1, wherein a pixel in the row(n+1) of the pixels includes a first TFT element and a first pixel electrode, a pixel in the row(n) of the pixels includes a second TFT element and a second pixel electrode.

13. The display device according to claim 12, further comprising:

a signal line electrically connected directly to the first TFT element and the second TFT element.

14. The display device according to claim 13, further comprising:

a display element between the first pixel electrode and the drive electrode(n+1), wherein the first TFT element is controllable to electrically disconnect the signal line from the first pixel electrode and electrically connect the first pixel electrode to the signal line.

15. The display device according to claim 13, further comprising:

a display element between the second pixel electrode and the drive electrode(n), wherein the second TFT element is controllable to electrically disconnect the signal line from the second pixel electrode and electrically connect the second pixel electrode to the signal line.

16. The display device according to claim 13, wherein a third TFT element and a fourth TFT element are electrically connected directly to the signal line.

17. The display device according to claim 16, wherein a pixel in the row(n−

1) of the pixels includes the third TFT element and a third pixel electrode, a pixel in the row(n−

2) of the pixels includes the fourth TFT element and a fourth pixel electrode.

18. The display device according to claim 17, further comprising:

a display element between the third pixel electrode and the drive electrode(n−

1), wherein the third TFT element is controllable to electrically disconnect the signal line from the third pixel electrode and electrically connect the third pixel electrode to the signal line.

19. The display device according to claim 17, further comprising:

a display element between the fourth pixel electrode and the drive electrode(n−

2), wherein the fourth TFT element is controllable to electrically disconnect the signal line from the fourth pixel electrode and electrically connect the fourth pixel electrode to the signal line.

20. The display device according to claim 1, wherein the time period(t−

1) occurs before the time period(t).

21. The display device according to claim 1, wherein the time period(t−

1) occurs before the time period(t+1).

22. The display device according to claim 1, wherein the time period(t) occurs before the time period(t+1).