Touch detection device, display device with touch detecting function, and electronic apparatus

• US 10,095,359 B2
• Filed: 01/08/2014
• Issued: 10/09/2018
• Est. Priority Date: 01/10/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Kurasawa, Hayato, Teranishi, Yasuyuki, Kida, Yoshitoshi
• Primary Examiner(s): Patel, Kumar
• Assistant Examiner(s): BOGALE, AMEN W
• Application Number:
  US14/150,309
• Publication Number:
  US 20140192018A1
• Time in Patent Office: 1,735 Days
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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 touch detection device includes a drive electrode layer including a plurality of drive electrodes formed in stripes in an array direction; a plurality of touch detection electrodes that are arranged in a manner facing the plurality of drive electrodes and generate capacitance with the plurality of drive electrodes; and a touch detecting unit that applies a touch drive signal to the plurality of drive electrodes and detects a position of an object in contiguity with a touch detection area based on detection signals supplied from the plurality of touch detection electrodes. The plurality of the drive electrodes include an end drive electrode that is provided to at least one end in the array direction and has a larger width in the array direction than the width in the array direction of drive electrodes other than the end drive electrode.

Claims

1. A display apparatus with a touch detecting function having a touch detection device and a display device arranged in a manner overlapping with the touch detection device, the display apparatus comprising:

an array substrate;

an opposed substrate opposed to the array substrate;

a display functional layer disposed between the array substrate and the opposed substrate;

a drive electrode layer that is disposed on the array substrate and includes a plurality of drive electrodes formed in stripes and arranged in an array direction, the drive electrodes including

an end drive electrode that has a first width in the array direction and that is provided to at least one end in the array direction, and

middle drive electrodes other than the end drive electrode, each of the middle drive electrodes having a second width in the array direction, the first width being greater than the second width;

a plurality of pixel electrodes arranged on a display functional side of the array substrate in a display area to display an image, the plurality of pixel electrodes being disposed on the plurality of drive electrodes via an insulation layer, wherein a common voltage is applied between the plurality of pixel electrodes and the plurality of drive electrodes such that the display functional layer performs an image display function;

a plurality of touch detection electrodes that are arranged on an observer side of the opposed substrate in a manner facing the plurality of drive electrodes and generate capacitance with the plurality of drive electrodes;

a chip;

a first wiring electrically connected to the chip;

a second wiring extending in a direction different from the first wiring; and

a touch detecting unit configured to detect a position of an object in contiguity with a touch detection area based on detection signals supplied from the plurality of touch detection electrodes,

wherein the end drive electrode, which has the first width greater than the second width and which is located farther from the chip than the middle drive electrodes each having the second width, overlaps a frame area outside the display area in the array direction, and where no pixel electrodes are disposed in the frame area,

wherein the second width is an integral multiple of a pixel pitch that is an arrangement interval between the plurality of pixel electrodes in the display area,

wherein a difference between the first width and the second width is an even integral multiple of the pixel pitch, and

wherein the end drive electrode overlaps with the second wiring in the frame area and is electrically coupled to the second wiring via a plurality of contact portions in the frame area.

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

the display device comprises:

a control unit that applies the common voltage between the plurality of pixel electrodes and the plurality of drive electrodes based on an image signal and performs image display control such that the display functional layer performs the image display function.

3. The display apparatus with a touch detecting function according to claim 1, wherein the touch detection device is configured to detect the position using the detection signals supplied from at least two adjacent touch detection electrodes.

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

a boundary between the drive electrodes in the array direction overlaps a boundary between the pixel electrodes in the array direction.

5. The display apparatus with a touch detecting function according to claim 1, wherein, the plurality of drive electrodes in the drive electrode layer are arranged symmetrically with respect to a center in the array direction.

6. The display apparatus with a touch detecting function according to claim 1, wherein

the display device performs line-sequential scan on each of horizontal lines in a display operation, and

the boundary between the drive electrodes in the array direction overlaps a boundary between horizontal lines.

7. The display apparatus with a touch detecting function according to claim 1, wherein the end drive electrode, which has the first width greater than the second width and overlaps the frame area in which no pixel electrodes are disposed, has fringe electric field of intensity higher than intensity of respective one of the middle drive electrodes, the middle drive electrodes each having the second width and being disposed in the display area in which pixel electrodes are disposed.

8. An electronic apparatus having a display apparatus with a touch detecting function that has a touch detection device and a display device arranged in a manner overlapping with the touch detection device, the display apparatus comprising:

an array substrate;

an opposed substrate opposed to the array substrate;

a display functional layer disposed between the array substrate and the opposed substrate;

a drive electrode layer that is disposed on the array substrate and includes a plurality of drive electrodes formed in stripes and arranged in an array direction, the drive electrodes including

an end drive electrode that has a first width in the array direction and that is provided to at least one end in the array direction, and

middle drive electrodes other than the end drive electrode, each of the middle drive electrodes having a second width in the array direction, the first width being greater than the second width;

a plurality of pixel electrodes arranged on a display functional side of the array substrate in a display area to display an image, the plurality of pixel electrodes being disposed on the plurality of drive electrodes via an insulation layer, wherein a common voltage is applied between the plurality of pixel electrodes and the plurality of drive electrodes such that the display functional layer performs an image display function;

a plurality of touch detection electrodes that are arranged on an observer side of the opposed substrate in a manner facing the plurality of drive electrodes and generate capacitance with the plurality of drive electrodes;

a chip;

a first wiring electrically connected to the chip;

a second wiring extending in a direction different from the first wiring; and

a touch detecting unit configured to detect a position of an object in contiguity with a touch detection area based on detection signals supplied from the plurality of touch detection electrodes,

wherein the end drive electrode, which has the first width greater than the second width and which is located farther from the chip than the middle drive electrodes each having the second width, overlaps a frame area outside the display area in the array direction, and where no pixel electrodes are disposed in the frame area,

wherein the second width is an integral multiple of a pixel pitch that is an arrangement interval between the plurality of pixel electrodes in the display area,

wherein a difference between the first width and the second width is an even integral multiple of the pixel pitch, and

wherein the end drive electrode overlaps with the second wiring in the frame area, and is electrically coupled to the second wiring via a plurality of contact portions in the frame area.

9. The electronic apparatus according to claim 8, wherein, the plurality of drive electrodes in the drive electrode layer are arranged symmetrically with respect to a center in the array direction.