DISPLAY DEVICE AND ELECTRONIC DEVICE

• US 20140285466A1
• Filed: 02/25/2014
• Published: 09/25/2014
• Est. Priority Date: 03/22/2013
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: HAYASHI, Makoto
• Application Number:
  US14/189,033
• Publication Number:
  US 20140285466A1
• 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 3/04166 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A touch-sensor-equipped display device has: a panel unit including a screen area in which units of detection constituting a touch-sensor function and pixels constituting a display function are formed in a matrix pattern; a plurality of shared electrodes which are formed in the screen area, parallel to an X-direction, and for both display drive and touch drive; a plurality of common electrodes for display drive which are parallel to the X-direction and respectively alternately disposed with the plurality of respective shared electrodes in a Y-direction; a plurality of detection electrodes which are parallel to the Y-direction and intersecting with the plurality of shared electrodes and the plurality of common electrodes; and the units of detection corresponding to respective capacitors formed by intersections of the plurality of shared electrodes and the plurality of detection electrodes.

Claims

1. A display device comprising:

a panel unit including a screen area in which units of detection composing a touch-sensor function and pixels composing a display function are formed in a matrix pattern;

a plurality of drive electrodes which are formed in the screen area, parallel to a first direction, and for both display drive and touch drive;

a plurality of common electrodes for display drive which are formed in the screen area, parallel to the first direction, and respectively alternately disposed with the plurality of respective drive electrodes in a second direction intersecting with the first direction;

a plurality of detection electrodes which are formed in the screen area, parallel to the second direction, and intersect with the plurality of drive electrodes and the plurality of common electrodes; and

the units of detection corresponding to respective capacitors formed by intersections of the plurality of drive electrodes and the plurality of detection electrodes.

2. The display device according to claim 1,

wherein a width of each of the plurality of drive electrodes in the second direction is larger than a width of each of the plurality of detection electrodes in the first direction and is the same as a width of each of the plurality of common electrodes in the second direction.

3. The display device according to claim 1,

wherein a width of each of the plurality of drive electrodes in the second direction is larger than a width of the plurality of detection electrodes in the first direction and is smaller than a width of each of the plurality of common electrodes in the second direction.

4. The display device according to claim 1,

wherein a width of each of the plurality of drive electrodes in the second direction is larger than a width of each of the plurality of detection electrodes in the first direction and is larger than a width of each of the common electrodes in the second direction.

5. The display device according to claim 1,

wherein, in the screen area, the plurality of drive electrodes and the plurality of common electrodes are formed in a same layer in a third direction perpendicular to the screen area;

and

the plurality of drive electrodes are respectively juxtaposed with the plurality of respective common electrodes with a constant interval therebetween.

6. The display device according to any one of claim 1,

wherein each of the plurality of drive electrodes has

a thin wiring part extending in the first direction and intersecting with the detection electrode, and

a protruding electrode portion protruding from the thin wiring part to the second direction in a region not intersecting with the detection electrode.

7. The display device according to claim 6,

wherein each of the plurality of common electrodes has

a thin wiring part extending in the first direction, and

a protruding electrode portion protruding from the thin wiring part to the second direction in a region intersecting with the detection electrode.

8. The display device according to claim 6,

wherein, in the screen area, the plurality of drive electrodes and the plurality of common electrodes are formed in a same layer in a third direction perpendicular to the screen area;

and

the plurality of drive electrodes are respectively juxtaposed with the plurality of respective common electrodes with a constant interval therebetween.

9. The display device according to claim 1,

wherein each of the plurality of drive electrodes has

a plurality of electrode portions provided to be mutually separated in a region not intersecting with the detection electrode in the first direction, and

a wiring part which extends in the first direction and couple the plurality of electrode portions to a region thereof intersecting with the detection electrode.

10. The display device according to claim 9,

wherein the plurality of common electrodes formed in the screen area

is formed as an integrated common electrode in the screen area by connection in the second direction with thin line portions provided between the plurality of electrode portions in the plurality of drive electrodes, and

has a plurality of opening portions corresponding to positions at which the plurality of electrode portions are respectively disposed.

11. The display device according to claim 10,

wherein, in the screen area, the plurality of electrode portions of the plurality of drive electrodes and the integrated common electrode are formed in a same layer in a third direction perpendicular to the screen area;

and

the plurality of electrode portions of the plurality of drive electrodes are disposed respectively in the plurality of opening portions of the integrated common electrode with a constant interval.

12. The display device according to claim 9,

wherein the plurality of electrode portions are formed of a first electrically conductive material;

and

the wiring part is formed of a second electrically conductive material having a resistance lower than that of the first electrically conductive material.

13. The display device according to claim 9,

wherein the wiring part is provided in a first layer in a third direction perpendicular to the screen area;

the wiring part has a plurality of wirings parallel to the first direction;

the plurality of electrode portions are provided in a second layer in the third direction; and

,

in each of the plurality of drive electrodes, each of the plurality of electrode portions and the plurality of wirings of the wiring part are coupled to each other by a contact connecting portion in the third direction.

14. The display device according to claim 13, wherein

the electrode portion is provided above the wiring part in the third direction.

15. The display device according to claim 13, wherein

the wiring part is provided above the electrode portion in the third direction.

16. The display device according to claim 1,

wherein the plurality of detection electrodes are formed of thin line portions disposed at a constant pitch in the first direction.

17. The display device according to claim 1,

wherein the plurality of detection electrodes are disposed at a constant pitch in the first direction;

and

each of the plurality of detection electrodes is formed of a thin line portion branched into two in the screen area.

18. The display device according to claim 16,

wherein each of the plurality of detection electrodes has, at a position overlapped with the common electrode in a third direction perpendicular to the screen area, a protruding electrode portion protruding in the first direction from the thin line portion extending in the second direction.

19. The display device according to claim 1,

wherein the panel unit has

a first board structure in which the plurality of drive electrodes and the plurality of common electrodes are formed;

a second board structure in which the plurality of detection electrodes are formed; and

a display function layer which is provided between the first board structure and the second board structure and is controlled by the pixels in order to display an image.

20. The display device according to claim 1,

further comprising:

a first circuit unit which applies touch-drive signals to the plurality of drive electrodes in the screen area;

a second circuit unit which applies display-drive signals to the plurality of drive electrodes and the plurality of common electrodes of the screen area;

a third circuit unit which applies display-drive signals to the matrix of the pixels of the screen area; and

a fourth circuit unit which detects touch-detection signals based on the touch-drive signals from the plurality of detection electrodes of the screen area.