Touch detection device, display device with touch detection function, and covering member

• US 10,126,863 B2
• Filed: 11/08/2016
• Issued: 11/13/2018
• Est. Priority Date: 11/27/2015
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Noguchi, Koji
• Primary Examiner(s): CERULLO, LILIANA P
• Application Number:
  US15/346,093
• Publication Number:
  US 20170153749A1
• Time in Patent Office: 735 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• 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 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• 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 3/0443 using a single layer of sensing electrodes
• 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: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

According to an aspect, a touch detection device includes: a first substrate; a second substrate opposed to the first substrate; a cover base material opposed to the second substrate; a plurality of first electrodes overlapping a display region on a plane parallel with the first substrate; and a second electrode arranged at the cover base material and overlapping a frame region outside the display region. Proximity or contact of an object with respect to the frame region is detected based on capacitance between the first electrodes and the second electrode. The second electrode extends along a side of the frame region.

Claims

1. A touch detection device comprising:

a first substrate;

a second substrate opposed to the first substrate;

a plurality of detection electrodes overlapping a display region on a plane parallel with the first substrate; and

a cover base material that is opposed to the second substrate and that has a frame region outside the display region on a plane parallel with the cover base material;

a first drive electrode arranged in the frame region of the cover base material,

wherein

proximity or contact of an object with respect to the frame region is detected based on capacitance between the detection electrodes and the first drive electrode, and

the first drive electrode extends in a first direction along a side of the frame region that is between a side edge of the cover base material and an outer circumference of the display region,

the detection electrodes, each of which extends in a second direction intersecting the first direction, are arranged in the first direction in which the first drive electrode extends,

capacitance is formed between the detection electrodes and the first drive electrode in an area adjacent to the frame region, and

the touch detection device comprises a plurality of the first drive electrodes arranged to surround at least two sides of the outer circumference of the display region.

2. The touch detection device according to claim 1, further comprising

a plurality of second drive electrodes disposed in the display region, each of the second drive electrodes extending in the first direction along the first drive electrode,

wherein

the first drive electrode and the second drive electrodes are sequentially driven.

3. The touch detection device according to claim 2, further comprising:

a first driving unit that outputs a first drive signal to the second drive electrodes; and

a second driving unit that outputs a second drive signal to the first drive electrode, wherein

the first drive electrode is coupled to the second driving unit via a coupling member coupled to the cover base material.

4. The touch detection device according to claim 3, wherein an electric potential of the second drive signal is higher than an electric potential of the first drive signal.

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

the touch detection device according to claim 3;

a plurality of pixel electrodes arranged in a matrix in the display region on the plane parallel with the first substrate; and

a display function layer that exhibits an image display function in the display region, wherein

a plurality of pixel signal lines and a plurality of scanning signal lines intersecting with each other in a plan view are arranged at the first substrate, and

electric potentials of the scanning signal lines are in a floating state in a period of touch detection operation of detecting proximity or contact of an object, and electric potentials of the pixel signal lines are shifted in synchronization with the first drive signal or the second drive signal.

6. The touch detection device according to claim 2, wherein proximity or contact of an object with respect to the display region is detected based on capacitance between the detection electrodes and the second drive electrodes.

7. The touch detection device according to claim 2, wherein the second drive electrodes are common electrodes.

8. The touch detection device according to claim 2, wherein

the second drive electrodes, the first substrate, the detection electrodes, the first drive electrodes, and the cover base material are sequentially stacked on the second substrate in a third direction vertical to the second substrate.

9. The touch detection device according to claim 1, wherein one-dimensional coordinates of an object that is proximate to or brought into contact with the frame region are detected based on a change in capacitance between the detection electrodes and the first drive electrode.

10. The touch detection device according to claim 1, wherein the first drive electrode does not overlap the detection electrodes.

11. The touch detection device according to claim 1, wherein the first drive electrode is arranged in the frame region that is outside an outer circumference of the first substrate at which the detection electrodes are arranged.

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

the touch detection device according to claim 1;

a plurality of pixel electrodes arranged in a matrix in the display region on the plane parallel with the first substrate; and

a display function layer that exhibits an image display function in the display region.

13. The display device with a touch detection function according to claim 12, wherein a display operation of supplying a pixel signal to the pixel electrode to execute the image display function of the display function layer, and a touch detection operation of detecting proximity or contact of an object are performed in a time division manner.

14. The display device with a touch detection function according to claim 13, wherein

a plurality of pixel signal lines and a plurality of scanning signal lines intersecting with each other in a plan view are arranged at the first substrate, and

electric potentials of the pixel signal lines and the scanning signal lines are in a floating state in a period of the touch detection operation.

15. A touch detection device comprising:

a first substrate;

a second substrate opposed to the first substrate;

a plurality of detection electrodes overlapping a display region on a plane parallel with the first substrate; and

a cover base material that is opposed to the second substrate and that has a frame region outside the display region on a plane parallel with the cover base material;

a first drive electrode arranged at in the frame region of the cover base material,

wherein

proximity or contact of an object with respect to the frame region is detected based on capacitance between the detection electrodes and the first drive electrode, and

the first drive electrode extends in a first direction along a side of the frame region that is between a side edge of the cover base material and an outer circumference of the display region,

capacitance is formed between the detection electrodes and the first drive electrode in an area adjacent to the frame region,

the detection electrodes are individual electrodes arranged in a matrix and overlapping the display region, and

the touch detection device comprises a plurality of the first drive electrodes arranged to surround at least two sides of an outer circumference of the display region.