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

• US 20120044167A1
• Filed: 06/29/2011
• Published: 02/23/2012
• Est. Priority Date: 08/23/2010
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakanishi, Takayuki, Mizuhashi, Hiroshi
• Granted Patent: US 9,087,491 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 apparatus with a touch detection function, comprising:

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.

2. The display apparatus with a touch detection function according to claim 1,

wherein when a common drive electrode to be a target of the first scan driving and a common drive electrode to be a target of the second scan driving overlap, the scan drive section applies the display drive signal to the overlapping common drive electrode.

3. The display apparatus with a touch detection function according to claim 2,

wherein in the first scan driving, the scan drive section applies the same display drive signal to a common drive electrode corresponding to a display element having the pixel signal applied thereto and at least to a common drive electrode adjacent to the common drive electrode.

4. The display apparatus with a touch detection function according to claim 2,

wherein the display element is a liquid-crystal display element.

5. The display apparatus with a touch detection function according to claim 2,

wherein the touch detection element detects the external approaching object using a change in electrostatic capacitance on the basis of proximity or touch of the external approaching object.

6. A display apparatus comprising:

a plurality of drive electrodes;

a display element displaying on the basis of a display drive signal;

a detection element detecting on the basis of a touch-detection drive signal;

a scan drive section performing first scan driving to apply the display drive signal to the plurality of drive electrodes 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 drive electrodes,

wherein the scan drive section drives the drive electrodes for each plurality of the electrodes in the first and the second scan driving.

7. The display apparatus according to claim 6,

wherein the scan drive section includes a buffer, and

the buffer is disposed singly for each of the plurality of drive electrodes.

8. A drive circuit comprising,

to a display section with a touch detection function, including 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, and a touch detection element detecting an external approaching object on the basis of a touch-detection drive signal, 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.

9. A method of driving a display apparatus with a touch detection function, comprising:

first scan driving to apply a display drive signal to a plurality of common drive electrodes disposed in parallel so as to extend in one direction sequentially by time division for each plurality of the electrodes, and to apply a pixel signal to a pixel electrode corresponding to a common drive electrode having the display drive signal applied thereto in synchronism with application of the display drive signal sequentially by time division so as to display on the basis of the pixel signal and the display drive signal; and

second scan driving to apply a touch-detection drive signal for detecting an external approaching object to the plurality of common drive electrodes at a scan speed different from the first scan driving sequentially by time division for each plurality of the electrodes.

10. An electronic device comprising:

a display apparatus with a touch detection function; and

a control section performing operation control using the display apparatus with a touch detection function,

wherein the 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.