DISPLAY DEVICE WITH TOUCH DETECTION FUNCTION AND ELECTRONIC APPARATUS

• US 20170177133A1
• Filed: 03/08/2017
• Published: 06/22/2017
• Est. Priority Date: 11/30/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Azumi, Kohei, Ishizaki, Koji, Kurasawa, Hayato
• Granted Patent: US 10,067,624 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• 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 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• 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

Abstract

According to an aspect, a display device with a touch detection function includes: a substrate; a drive electrode that extends in a first direction; and a plurality of touch detection electrodes that are metal wirings extending in a second direction different from the first direction. The metal wirings are arranged with a predetermined pitch so as to make capacitive coupling with the drive electrode.

Claims

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

a substrate;

a plurality of pixel electrodes that are arranged in a matrix on a plane parallel to a surface of the substrate;

a plurality of signal lines that extend in a first direction on a plane parallel to the surface of the substrate and supply pixel signals used for displaying an image to the pixel electrodes;

a display functional layer that performs an image displaying function based on the pixel signals;

a drive electrode that faces the plurality of the pixel electrodes in a vertical direction with respect to the surface of the substrate and extends in the first direction;

a plurality of touch detection electrodes each extending in a second direction different from the first direction, the touch detection electrodes being metal wirings facing the drive electrode in the vertical direction; and

a plurality of dummy electrodes each extending in the second direction, the dummy electrodes being metal wirings of a same material with the touch detection electrodes, the dummy electrodes being not coupled with a touch detection unit which detects a touch based on a detection signal from the touch detection electrodes,

wherein the metal wirings including the dummy electrodes and the touch detection electrodes are arranged at intervals of a natural number multiple of a first pixel pitch of the pixel electrodes in the first direction.

2. The display device with a touch detection function according to claim 1, wherein one of the touch detection electrodes and one of the dummy electrodes adjacent to the one of the touch detection electrodes in the first direction are arranged at an interval of a natural number multiple of the first pixel pitch.

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

at least two dummy electrodes are disposed between the touch detection electrodes adjacent in the first direction,

the dummy electrodes adjacent to each other in the first direction are arranged at intervals of a natural number multiple of the first pixel pitch, and

the touch detection electrodes are arranged at intervals of equal to or greater than three times of the first pixel pitch.

4. The display device with a touch detection function according to claim 1, further comprising a color filter that faces the display functional layer in the vertical direction and has a plurality of color areas including at least one of a color area colored in red, a color area colored in green, and a color area colored in blue,

wherein an extending direction of each color area of the color filter coincides with the first direction, and

the plurality of touch detection electrodes cross over each color area of the color filter.

5. The display device with a touch detection function according to claim 1, wherein the touch detection electrodes are disposed in a layer nearer to the pixel display functional layer than a light shielding layer shielding light in an edge portion of the pixels.

6. The display device with a touch detection function according to claim 1, wherein the touch detection electrodes include a bending portion.

7. The display device with a touch detection function according to claim 1, wherein the touch detection electrodes are configured to detect an external proximity object by using a change in electrostatic capacitance that is caused by proximity or contact of the external proximity object.

8. The display device with a touch detection function according to claim 1, further comprising a scanning drive unit that applies a display drive signal to the drive electrodes in a display operation period and applies a touch drive signal to the drive electrodes in a touch detection operation period.

9. An electronic apparatus including a display device with a touch detection function capable of detecting an external proximity object, the display device with a touch detection function comprising:

a substrate;

a plurality of pixel electrodes that are arranged in a matrix on a plane parallel to a surface of the substrate;

a plurality of signal lines that extend in a first direction on a plane parallel to the surface of the substrate and supply pixel signals used for displaying an image to the pixel electrodes;

a display functional layer that performs an image displaying function based on the pixel signals;

a drive electrode that faces the plurality of the pixel electrodes in a vertical direction with respect to the surface of the substrate and extends in the first direction;

a plurality of touch detection electrodes each extending in a second direction different from the first direction, the touch detection electrodes being metal wirings facing the drive electrode in the vertical direction; and

a plurality of dummy electrodes each extending in the second direction, the dummy electrodes being metal wirings of a same material with the touch detection electrodes, the dummy electrodes being not coupled with a touch detection unit which detects a touch based on a detection signal from the touch detection electrodes,

wherein the metal wirings including the dummy electrodes and the touch detection electrodes are arranged at intervals of a natural number multiple of a first pixel pitch of the pixel electrodes in the first direction.