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

• US 20120044195A1
• Filed: 07/08/2011
• 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, Kida, Yoshitoshi, Noguchi, Koji, Mizuhashi, Hiroshi, Ishizaki, Koji
• Granted Patent: US 8,933,895 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04101 2.5D-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 and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• 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 device with a touch detection function includes a plurality of common drive electrodes arranged side by side to extend in one direction, a display element performing display, based on a pixel signal and a display drive signal, a touch detection element of electrostatic capacitance type detecting an external proximity object based on a touch detection drive signal with an amplitude larger than that of the display drive signal, and a scan drive section performing first scan drive and second scan drive, the first scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the display drive signal in a time-divisional manner, and the second scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the touch detection drive signal in a time-divisional manner.

Claims

1. A display device with a touch detection function comprising:

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

a display element performing display, based on a pixel signal and a display drive signal;

a touch detection element of electrostatic capacitance type detecting an external proximity object based on a touch detection drive signal with an amplitude larger than that of the display drive signal; and

a scan drive section performing first scan drive and second scan drive, the first scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the display drive signal in a time-divisional manner, and the second scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the touch detection drive signal in a time-divisional manner.

2. The display device according to claim 1, wherein when the common drive electrode selected as a target of the first scan drive is coincident with the common drive electrode selected as a target of the second scan drive, the scan drive section applies the display drive signal to the coincident common drive electrode.

3. The display device according to claim 2, wherein the scan drive section includes a first switch and a second switch, turning-on of the first switch allowing the common drive electrodes to be supplied with the display drive signal during the first scan drive, and turning-on of the second switch allowing the common drive electrodes to be supplied with the touch detection drive signal during the second scan drive.

4. The display device according to claim 3, wherein

the scan drive section further includes a third switch, turning-on of the third switch allowing unselected common drive electrodes, which is not selected as a target of the first and second scan drive, to be supplied with a direct-current potential.

5. The display device according to claim 4, wherein the direct-current potential is equal to a time-averaged voltage value of the display drive signal.

6. The display device according to claim 2, wherein the touch detection drive signal is a rectangular wave signal with alternately-inverted polarity.

7. A display device comprising:

a plurality of common drive electrodes;

a display element performing display based on a pixel signal and a display drive signal;

a detection element performing detection based on a detection drive signal with an amplitude larger than that of the display drive signal; and

a scan drive section including a first switch and a second switch, turning-on of the first switch allowing the common drive electrodes to be supplied with the display drive signal, and turning-on of the second switch allowing the common drive electrodes to be supplied with the detection drive signal.

8. A drive circuit comprising a scan drive section performing first scan drive and second scan drive, the first scan drive allowing a plurality of common drive electrodes to be sequentially supplied with a display drive signal in a time-divisional manner, and the second scan drive allowing the plurality of common drive electrodes to be sequentially supplied with a touch detection drive signal with an amplitude larger than that of the display drive signal in a time-divisional manner, on a display section with a touch detection function including the plurality of common drive electrodes, a display element, and a touch detection element of electrostatic capacitance type, the plurality of common drive electrodes being arranged side by side to extend in one direction, the display element performing display based on a pixel signal and the display drive signal, and the touch detection element of electrostatic capacitance type detecting an external proximity object based on the touch detection drive signal.

9. A driving method of a display device with a touch detection function performing first scan drive operation and second scan drive operation, the first scan drive operation for performing display, based on a pixel signal and a display drive signal, by allowing a plurality of common drive electrodes to be sequentially supplied with a display drive signal in a time-divisional manner, and allowing pixel electrodes, corresponding to the common drive electrodes which are under the supply of the display drive signal, to be sequentially supplied with the pixel signal in synchronization with the supply of the display drive signal, the plurality of common drive electrodes being arranged side by side to extend in one direction, and the second scan drive operation for detecting an external proximity object, based on a detection signal from a touch detection electrode, by allowing the plurality of common drive electrodes to be sequentially supplied with a touch detection drive signal with an amplitude larger than that of the display drive signal in a time-divisional manner, the touch detection electrode forming an electrostatic capacitance with the plurality of common drive electrodes.

10. An electronic unit including a display device with a touch detection function and a control section performing operation control with use of the display device with a touch detection function, the display device with a touch detection function comprising:

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

a display element performing display based on a pixel signal and a display drive signal;

a touch detection element of electrostatic capacitance type detecting an external proximity object, based on a touch detection drive signal with an amplitude larger than that of the display drive signal; and

a scan drive section performing first scan drive and second scan drive, the first scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the display drive signal in a time-divisional manner, and the second scan drive allowing the plurality of common drive electrodes to be sequentially supplied with the touch detection drive signal in a time-divisional manner.