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

• US 9,087,491 B2
• Filed: 06/29/2011
• Issued: 07/21/2015
• Est. Priority Date: 08/23/2010
• Status: Expired due to Fees

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Nakanishi, Takayuki, Mizuhashi, Hiroshi
• Primary Examiner(s): Wang, Quan-Zhen
• Assistant Examiner(s): DICKE, CHAD M
• Application Number:
  US13/067,829
• Publication Number:
  US 20120044167A1
• Time in Patent Office: 1,483 Days
• Field of Search: 345/173, 178/18.01
• US Class Current: 1/1
• 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:

groups of common drive electrodes, each of the groups including a plurality of the common drive electrodes, disposed in parallel so as to extend in one direction;

a plurality of display elements configured to display on the basis of a pixel signal and a display drive signal;

a plurality of touch detection elements configured to detect an external object on the basis of a touch-detection drive signal;

a first signal line for applying to the display elements a signal indicating a row to be displayed, the first signal line being provided corresponding to each of the common drive electrodes;

a second signal line for applying to each of the common drive electrodes the touch-detection drive signal, the second signal line being solely provided for each of the groups of the common drive electrodes; and

a scan drive section configured to perform first scan driving having a first scan speed to apply the display drive signal to each of the groups of the common drive electrodes sequentially by time division and second scan driving having a second scan speed different from the first scan speed of the first scan driving to apply the touch-detection drive signal to each of the groups of the common drive electrodes sequentially by time division,

wherein the scan drive section includes a plurality of drive sections each disposed between each of the groups of the common drive electrodes and the sole second signal line,

each of the plurality of drive sections includes a circuit portion connected to at least two of the display drive signals adjacent to each other, and another circuit portion connected to the circuit portion and one of the touch detection drive signal, the other circuit portion applying not the touch-detection drive signal but the display drive signal to the common drive electrodes if at least one of the display drive signals and the touch detection drive signal are active at the same time,

the each of the plurality of drive sections is configured to apply the touch-detection drive signal to all of the common drive electrodes of the group associated therewith in response to a signal from the sole second signal line, and configured to, upon any one of the plurality of first signal lines indicating the row of the display elements to be displayed, apply the display drive signal to all of the common drive electrodes of the group associated therewith, the scan drive section drives the common drive electrodes for each of the groups of the electrodes in the first scan driving and the second scan driving,

a scan direction of the second scan driving is constant,

the second scan speed is a speed in which the second scan driving overtakes the first scan driving when the first scan driving is performed at the first scan speed, and

the scan drive section applies not the touch-detection drive signal but the display drive signal to each of the groups of the common drive electrodes to be subject to the first scan driving and the second scan driving when the second scan driving overlaps the first scan driving.

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

3. The display apparatus with a touch detection function according to claim 1, wherein the display element is a liquid-crystal display element.

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

5. The display apparatus with a touch detection function according to claim 1, wherein the scan drive section includes a display priority circuit configured to apply not the touch-detection drive signal but the display drive signal to each of the groups of the common drive electrodes to be subject to the first scan driving and the second scan driving when the second scan driving overlaps the first scan driving.

6. A display apparatus comprising:

groups of drive electrodes, each of the groups including a plurality of drive electrodes, disposed in parallel so as to extend in one direction;

a plurality of display elements configured to display on the basis of a display drive signal;

a plurality of touch detection elements configured to detect on the basis of a touch-detection drive signal;

a first signal line for applying to the display elements a signal indicating a row to be displayed, the first signal line being provided corresponding to each of the common drive electrodes;

a second signal line for applying to each of the common drive electrodes the touch-detection drive signal, the second signal line being solely provided for each of the groups of the common drive electrodes; and

a scan drive section configured to perform first scan driving having a first scan speed to apply the display drive signal to each of the groups of drive electrodes and second scan driving having a second scan speed different from the first scan speed of the first scan driving to apply the touch-detection drive signal to each of the groups of drive electrodes,

wherein the scan drive section drives the includes a plurality of drive sections each disposed between each of the groups of the common drive electrodes and the sole second signal line,

each of the plurality of drive sections includes a circuit portion connected to at least two of the display drive signals adjacent to each other, and another circuit portion connected to the circuit portion and one of the touch detection drive signal, the other circuit portion applying not the touch-detection drive signal but the display drive signal to the common drive electrodes if at least one of the display drive signals and the touch detection drive signal are active at the same time,

the each of the plurality of drive sections is configured to apply the touch-detection drive signal to all of the common drive electrodes of the group associated therewith in response to a signal from the sole second signal line, and configured to, upon any one of the plurality of first signal lines indicating the row of the display elements to be displayed, apply the display drive signal to all of the drive electrodes of the group associated therewith,

the scan drive section drives the common drive electrodes for each of the groups of the electrodes in the first scan driving and the second scan driving,

a scan direction of the second scan driving is constant,

the second scan speed is a speed in which the second scan driving overtakes the first scan driving when the first scan driving is performed at the first scan speed, and

the scan drive section applies not the touch-detection drive signal but the display drive signal to each of the groups of the common drive electrodes to be subject to the first scan driving and the second scan driving when the second scan driving overlaps the first 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 configured to be connected to a display section with a touch detection function, the display section including:

groups of common drive electrodes, each of groups including a plurality of the common drive electrodes, disposed in parallel so as to extend in one direction;

a plurality of display elements displaying on the basis of a pixel signal and a display drive signal; and

a plurality of touch detection elements detecting an external object on the basis of a touch-detection drive signal,

the drive circuit comprising;

a first signal line for applying to the display elements a signal indicating a row to be displayed, the first signal line being provided corresponding to each of the common drive electrodes;

a second signal line for applying to each of the common drive electrodes the touch-detection drive signal, the second signal line being solely provided for each of the groups of the common drive electrodes; and

a scan drive section configured to perform first scan driving having a first scan speed to apply the display drive signal to each of the groups of the common drive electrodes sequentially by time division and second scan driving having a second scan speed different from the first scan speed of the first scan driving to apply the touch-detection drive signal to each of the groups of the common drive electrodes sequentially by time division,

wherein the scan drive section includes a plurality of drive sections each disposed between each of the groups of the common drive electrodes and the sole second signal line,

each of the plurality of drive sections includes a circuit portion connected to at least two of the display drive signals adjacent to each other, and another circuit portion connected to the circuit portion and one of the touch detection drive signal, the other circuit portion applying not the touch-detection drive signal but the display drive signal to the common drive electrodes if at least one of the display drive signals and the touch detection drive signal are active at the same time,

the each of the plurality of drive sections is configured to apply the touch-detection drive signal to all of the common drive electrodes of the group associated therewith in response to a signal from the sole second signal line, and configured to, upon any one of the plurality of first signal lines indicating the row of the display elements to be displayed, apply the display drive signal to all of the drive electrodes of the group associated therewith,

the scan drive section drives the common drive electrodes for each of the groups of the electrodes in the first scan driving and the second scan driving,

a scan direction of the second scan driving is constant,

the second scan speed is a speed in which the second scan driving overtakes the first scan driving when the first scan driving is performed at the first scan speed, and

the scan drive section applies not the touch-detection drive signal but the display drive signal to each of the groups of the common drive electrodes to be subject to the first scan driving and the second scan driving when the second scan driving overlaps the first scan driving.

9. The drive circuit according to claim 8, 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.

10. The drive circuit according to claim 9, 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.

11. The drive circuit according to claim 9, wherein the display element is a liquid-crystal display element.

12. The drive circuit according to claim 9, 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.

13. A method of driving a display apparatus, the driving a display apparatus including:

groups of common drive electrodes, each of the groups including a plurality of the common drive electrodes, disposed in parallel so as to extend in one direction;

a plurality of display elements configured to display on the basis of a display drive signal;

a plurality of touch detection elements configured to detect on the basis of a touch-detection drive signal;

a first signal line for applying to the display elements a signal indicating a row to be displayed, the first signal line being provided corresponding to each of the common drive electrodes;

a second signal line for applying to each of the common drive electrodes the touch-detection drive signal, the second signal line being solely provided for each of the groups of the common drive electrodes; and

a scan drive section configured to perform first scan driving having a first scan speed to apply the display drive signal to each of the groups of drive electrodes and second scan driving having a second scan speed different from the first scan speed of the first scan driving to apply the touch-detection drive signal to each of the groups of drive electrodes,

wherein the scan drive section drives the includes a plurality of drive sections each disposed between each of the groups of the common drive electrodes and the sole second signal line,

each of the plurality of drive sections includes a circuit portion connected to at least two of the display drive signals adjacent to each other, and another circuit portion connected to the circuit portion and one of the touch detection drive signal, the other circuit portion applying not the touch-detection drive signal but the display drive signal to the common drive electrodes if at least one of the display drive signals and the touch detection drive signal are active at the same time,

the each of the plurality of drive sections is configured to apply the touch-detection drive signal to all of the common drive electrodes of the group associated therewith in response to a signal from the sole second signal line, and configured to, upon any one of the plurality of first signal lines indicating the row of the display elements to be displayed, apply the display drive signal to all of the drive electrodes of the group associated therewith,

the scan drive section drives the common drive electrodes for each of the groups of the electrodes in the first scan driving and the second scan driving,

a scan direction of the second scan driving is constant, and

the second scan speed is a speed in which the second scan driving overtakes the first scan driving when the first scan driving is performed at the first scan speed,

the method comprising;

first scan driving to apply the display drive signal to each of the groups of the common drive electrodes sequentially by time division;

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 each of the groups of the common drive electrodes sequentially by time division; and

applying not the touch-detection drive signal but the display drive signal to each of the groups of the common drive electrodes to be subject to the first scan driving and the second scan driving when the second scan driving overlaps the first scan driving.

14. 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;

groups of common drive electrodes, each of groups including a plurality of the common drive electrodes, disposed in parallel so as to extend in one direction,

a plurality of display elements configured to display on the basis of a pixel signal and a display drive signal,

a plurality of touch detection elements configured to detect an external approaching object on the basis of a touch-detection drive signal,

a first signal line for applying to the display elements a signal indicating a row to be displayed, the first signal line being provided corresponding to each of the common drive electrodes;

a second signal line for applying to each of the common drive electrodes the touch-detection drive signal, the second signal line being solely provided for each of the groups of the common drive electrodes; and

a scan drive section configured to perform first scan driving having a first scan speed to apply the display drive signal to each of the groups of the common drive electrodes sequentially by time division and second scan driving having a second scan speed different from a scan speed of the first scan driving to apply the touch-detection drive signal to each of the groups of the common drive electrodes sequentially by time division,

wherein the scan drive section drives the common includes a plurality of drive sections each disposed between each of the groups of the common drive electrodes and the sole second signal line,

each of the plurality of drive sections includes a circuit portion connected to at least two of the display drive signals adjacent to each other, and another circuit portion connected to the circuit portion and one of the touch detection drive signal, the other circuit portion applying not the touch-detection drive signal but the display drive signal to the common drive electrodes if at least one of the display drive signals and the touch detection drive signal are active at the same time,

the each of the plurality of drive sections is configured to apply the touch-detection drive signal to all of the common drive electrodes of the group associated therewith in response to a signal from the sole second signal line, and configured to, upon any one of the plurality of first signal lines indicating the row of the display elements to be displayed, apply the display drive signal to all of the drive electrodes of the group associated therewith,

the scan drive section drives the common drive electrodes for each of the groups of the electrodes in the first scan driving and the second scan driving,

a scan direction of the second scan driving is constant,

the second scan speed is a speed in which the second scan driving overtakes the first scan driving when the first scan driving is performed at the first scan speed, and

the scan drive section applies not the touch-detection drive signal but the display drive signal to each of the groups of the common drive electrodes to be subject to the first scan driving and the second scan driving when the second scan driving overlaps the first scan driving.

15. The electronic device according to claim 14, 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.

16. The electronic device according to claim 15, 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.

17. The electronic device according to claim 15, wherein the display element is a liquid-crystal display element.

18. The electronic device according to claim 15, 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.