DISPLAY DEVICE WITH TOUCH DETECTION FUNCTION AND ELECTRONIC APPARATUS

• US 20170315639A1
• Filed: 07/18/2017
• Published: 11/02/2017
• Est. Priority Date: 12/05/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: KIDA, Yoshitoshi, NOGUCHI, Koji, TERANISHI, Yasuyuki, MIZUHASHI, Hiroshi, AZUMI, Kohei
• Granted Patent: US 10,146,389 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• 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 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/04182 Filtering of noise external to the device and not generated by digitiser components
• CPC Class Codes: G06F 3/044 by capacitive means
• 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

Abstract

According to an aspect, a display device with a touch detection function includes a plurality of drive electrodes that face a plurality of pixel electrodes in an orthogonal direction to the surface of the substrate, and extend in a direction parallel to the direction in which a plurality of signal lines extend. The display device with a touch detection function also includes a scan driving unit that applies a touch drive signal to a signal line that faces, in an overlapping manner in the orthogonal direction, a drive electrode to which the touch drive signal is applied.

Claims

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

a substrate;

a plurality of pixel electrodes that are provided to the substrate;

a plurality of signal lines configured to supply pixel signals;

a plurality of drive electrodes that face the pixel electrodes in an orthogonal direction to a surface of the substrate, each of the drive electrodes overlapping at least one of the signal lines in the orthogonal direction; and

a driving circuit configured to;

apply a touch drive signal to a first drive electrode selected from the drive electrodes; and

apply a first signal to a first signal line of the signal lines that faces the first drive electrode in an overlapping manner in the orthogonal direction, the first signal being a signal to suppress an influence by a parasitic capacitance between the first drive electrode and the first signal line.

2. The display device according to claim 1, wherein the first drive electrode is one of a plurality of first drive electrodes.

3. The display device according to claim 1, wherein the first signal line is one of a plurality of first signal lines.

4. The display device according to claim 1, wherein the first signal is a rectangular wave signal.

5. The display device according to claim 1, wherein

in a display operation period, the driving circuit is configured to apply a display drive signal to the drive electrodes, and apply the pixel signals to the signal lines, and

in a touch detection operation period, the driving circuit is configured to apply the touch drive signal to the first drive electrode, and apply the first signal to the first signal line.

6. The display device according to claim 1, further comprising a color filter colored into different regions of a red region, a green region, and a blue region each corresponding to the pixel electrodes,

wherein the drive electrodes are arranged such that a gap between adjacent drive electrodes of the drive electrodes overlaps at least one of a gap between the red region and the blue region of the color filter or a gap between the green region and the blue region of the color filter.

7. The display device according to claim 1, further comprising:

a plurality of metal wirings arranged for respective gaps between adjacent drive electrodes of the drive electrodes, each of the metal wirings being arranged between a corresponding gap of the gaps and a corresponding signal line of the signal lines when viewed in the orthogonal direction.

8. The display device according to claim 1, further comprising a plurality of metal wirings configured to be electrically coupled to the respective drive electrodes, each of the metal wirings being arranged in a position facing a corresponding signal line of the signal lines when viewed in the orthogonal direction.

9. The display device according to claim 8,

wherein the driving circuit is configured to:

apply the touch drive signal to a first metal wiring selected from the metal wirings; and

apply the first signal to a second signal line of the signal lines that faces the first metal wiring in an overlapping manner in the orthogonal direction.

10. The display device according to claim 1, further comprising a detection circuit configured to detect a change in electrostatic capacitance.

11. The display device according to claim 1,

wherein the driving circuit is configured to fix a second drive electrode of the drive electrodes to a predetermined potential, the second drive electrode being not selected as the first drive electrode.

12. The display device according to claim 1,

wherein the driving circuit is configured to fix a second signal line of the signal lines to a predetermined potential, the second signal line facing the first metal wiring in an overlapping manner in the orthogonal direction and being not selected as the first drive electrode.

13. The display device according to claim 1,

wherein the second signal line does not overlap the first drive electrode.

14. The display device according to claim 1, wherein

a first set of signal lines of the signal lines corresponds to one of the drive electrodes, and

the first set of signal lines is configured to be coupled to a signal selector.

15. The display device according to claim 14, wherein

the signal selector includes a switch, and

one end of the switch is coupled to one of the first set of signal lines, and the other end thereof is coupled to a common wiring.

16. The display device according to claim 2,

wherein the common wiring is configured to apply the first signal to the first set of signal lines.

17. The display device according to claim 1,

wherein wirings configured to supply the touch drive signal are routed so as to surround a display region.

18. A display device comprising:

a substrate;

a plurality of pixel electrodes that are provided to the substrate;

a plurality of signal lines configured to supply pixel signals;

a plurality of drive electrodes that face the pixel electrodes in an orthogonal direction to a surface of the substrate, each of the drive electrodes overlapping at least one of the signal lines in the orthogonal direction; and

a driving circuit configured to;

apply a touch drive signal to a first drive electrode selected from the drive electrodes; and

apply a first signal to a first signal line of the signal lines that faces the first drive electrode in an overlapping manner in the orthogonal direction, the first signal being a rectangle wave signal having a same amplitude as that of the touch drive signal.

19. A display device comprising:

a substrate;

a plurality of pixel electrodes provided to the substrate;

a plurality of signal lines configured to supply pixel signals;

a plurality of drive electrodes that face the pixel electrodes in an orthogonal direction to a surface of the substrate, each of the drive electrodes overlapping at least one of the signal lines in the orthogonal direction;

a plurality of metal wirings configured to be electrically coupled to the respective drive electrodes, each of the metal wirings overlapping at least one of the signal lines in the orthogonal direction; and

a driving circuit configured to;

apply a touch drive signal to a first drive electrode selected from the drive electrodes; and

apply the touch drive signal to a first metal wiring of the metal wirings that faces a first signal line of the signal lines, the first signal line facing the first drive electrode.