DISPLAY DEVICE WITH TOUCH DETECTION FUNCTION AND ELECTRONIC APPARATUS

• US 20140192019A1
• Filed: 01/10/2014
• Published: 07/10/2014
• Est. Priority Date: 01/10/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: FUKUSHIMA, Toshiaki
• Granted Patent: US 9,836,168 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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

Abstract

According to an aspect, a display device with a touch detection function includes a controller, touch wiring that supplies a touch drive signal to drive electrodes, and a plurality of switch groups that are provided for each of the drive electrodes, each of the plurality of switch groups having selection switches. The plurality of switch groups select a drive electrode to be coupled to a touch wiring based on a selection signal from the controller. The selection switches for each of the plurality of switch groups are coupled in parallel with each other between a corresponding drive electrode and the touch wiring, and for each of the drive electrodes, all of the selection switches operate in accordance with the selection signal, couple the corresponding drive electrodes and the touch wiring, and apply the touch drive signal to the corresponding drive electrodes.

Claims

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

a display area including a plurality of pixel electrodes arranged in a matrix on a substrate;

a plurality of drive electrodes that are disposed to face at least one of the plurality of pixel electrodes;

a display function layer that has an image display function to display an image in the display area;

a controller that performs image display control to fulfill the image display function of the display function layer by applying a display drive voltage between the plurality of pixel electrodes and the plurality of drive electrodes based on an image signal;

a plurality of touch detection electrodes that face the plurality of drive electrodes, and form an electrostatic capacitance between the plurality of drive electrodes and the plurality of touch detection electrodes;

a touch detection unit that detects a position of an approaching object based on a detection signal from the plurality of touch detection electrodes;

touch wiring that is routed in a frame area located outside the display area and supplies a touch drive signal to the plurality of drive electrodes; and

a plurality of switch groups that are provided for each of the plurality of drive electrodes, each of the plurality of switch groups having a plurality of selection switches that operate based on a selection signal from the controller, wherein

the plurality of switch groups select a drive electrode to be coupled to the touch wiring from the plurality of drive electrodes based on a selection signal from the controller, and

the plurality of selection switches for each of the plurality of switch groups are coupled in parallel with each other between a corresponding drive electrode and the touch wiring, and for each of the plurality of drive electrodes, all of the plurality of selection switches operate in accordance with the selection signal, couple the corresponding drive electrodes and the touch wiring, and apply the touch drive signal to the corresponding drive electrodes.

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

the controller includes a vertical drive circuit,

the vertical drive circuit is coupled to a plurality of scan lines that select pixels in a row unit, and

the plurality of scan lines intersect with the touch wiring in a grade separation manner and the selection switches are arranged in an area between the adjacent scan lines.

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

the vertical drive circuit includes a first vertical drive circuit and a second vertical drive circuit,

the first and the second vertical drive circuits are disposed at ends of the plurality of scan lines in a longitudinal direction of the plurality of scan lines and select the respective pixels in the display area row by row by alternately applying a vertical scan pulse to every other scan line, and

a distance between the scan lines intersecting with the touch wiring in a grade separation manner is larger than a distance between the adjacent scan lines in the display area.

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

the vertical drive circuit includes a first vertical circuit and a second vertical circuit,

the first and the second vertical drive circuits are disposed with the plurality of scan lines interposed therebetween in an extending direction of the plurality of scan lines, and select the respective pixels in the display area row by row by alternately applying a vertical scan pulse to the scan lines in a scan direction,

the scan lines are arranged between the adjacent selection switches, and

a distance between the scan lines intersecting with the touch wiring in a grade separation manner and being adjacent to the selection switch is larger than a distance between the adjacent scan lines in the display area.

5. The display device with a touch detection function according to claim 3, wherein

the touch wiring includes first touch wiring on the first vertical drive circuit side and second touch wiring on the second vertical drive circuit side,

the scan lines coupled to the first vertical drive circuit intersect with the first touch wiring on the first vertical drive circuit side in a grade separation manner and do not intersect with the second touch wiring on the second vertical drive circuit side in a grade separation manner, and

the scan lines coupled to the second vertical drive circuit intersect with the second touch wiring on the second vertical drive circuit side in a grade separation manner and do not intersect with the first touch wiring on the first vertical drive circuit side in a grade separation manner.

6. The display device with a touch detection function according to claim 4, wherein

the touch wiring includes first touch wiring on the first vertical drive circuit side and second touch wiring on the second vertical drive circuit side,

the scan lines coupled to the first vertical drive circuit intersect with the first touch wiring on the first vertical drive circuit side in a grade separation manner and do not intersect with the second touch wiring on the second vertical drive circuit side in a grade separation manner, and

the scan lines coupled to the second vertical drive circuit intersect with the second touch wiring on the second vertical drive circuit side in a grade separation manner and do not intersect with the first touch wiring on the first vertical drive circuit side in a grade separation manner.

7. The display device with a touch detection function according to claim 2, wherein a distance between the scan lines intersecting with the touch wiring in a grade separation manner is a distance between the adjacent scan lines in the display area.

8. The display device with a touch detection function according to claim 1, further comprising:

display wiring that supplies the display drive voltage, wherein

the display wiring is disposed closer to the display area than the touch wiring.

9. The display device with a touch detection function according to claim 8, wherein the plurality of selection switches select either a connection between the plurality of drive electrodes and the display wiring or a connection between the plurality of drive electrodes and the touch wiring in a time-division manner.

10. An electronic apparatus having a display device with a touch detection function capable of detecting an externally approaching object, the display device with a touch detection function comprising:

a display area including a plurality of pixel electrodes arranged in a matrix on a substrate;

a plurality of drive electrodes that are disposed to face at least one of the plurality of pixel electrodes;

a display function layer that has an image display function to display an image in the display area;

a controller that performs image display control to fulfill the image display function of the display function layer by applying a display drive voltage between the plurality of pixel electrodes and the plurality of drive electrodes based on an image signal;

a plurality of touch detection electrodes that face the plurality of drive electrodes, and form an electrostatic capacitance between the plurality of drive electrodes and the plurality of touch detection electrodes;

a touch detection unit that detects a position of an approaching object based on a detection signal from the plurality of touch detection electrodes;

touch wiring that is routed in a frame area located outside the display area and supplies a touch drive signal to the plurality of drive electrodes; and

a plurality of switch groups that are provided for each of the plurality of drive electrodes, each of the plurality of switch groups having a plurality of selection switches that operate based on a selection signal from the controller, wherein

the plurality of switch groups select a drive electrode to be coupled to the touch wiring from the plurality of drive electrodes based on a selection signal from the controller, and

the plurality of selection switches for each of the plurality of switch groups are coupled in parallel with each other between a corresponding drive electrode and the touch wiring, and for each of the plurality of drive electrodes, all of the plurality of selection switches operate in accordance with the selection signal, couple the corresponding drive electrodes and the touch wiring, and apply the touch drive signal to the corresponding drive electrodes.