Touch screen and display device including the same

Patent metadata

Field	Value
Publication number	US-10216303-B2
Application number	US-201715438361-A
Country	US
Kind code	B2
Filing date	Feb 21, 2017
Priority date	Feb 29, 2016
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

The present disclosure relates to a touch screen which includes: a base substrate including a sensing area and a peripheral area enclosing an edge of the sensing area; a first touch electrode disposed in the sensing area and extending in a first direction; a second touch electrode disposed in the sensing area and extending in a second direction which crosses the first direction; a plurality of sensing lines disposed in the peripheral area, wherein one ends of the sensing lines are respectively connected to the first touch electrode and the second touch electrode; and a pad unit disposed in the peripheral area and connected to the other end of each of the sensing lines to electrically connect the sensing lines to a driving circuit, wherein the sensing lines have different line widths.

First claim

What is claimed is:

1. A touch screen comprising:
a base substrate including a sensing area and a peripheral area enclosing an edge of the sensing area;
a first touch electrode disposed in the sensing area and extending in a first direction;
a second touch electrode disposed in the sensing area and extending in a second direction which crosses the first direction;
a plurality of sensing lines disposed in the peripheral area, wherein some of the plurality of sensing lines are each connected at one end to the first touch electrode and some of the plurality of sensing lines are each connected at one end to the second touch electrode;
a pad unit disposed in the peripheral area and connected to an other end of each of the plurality of sensing lines to electrically connect the sensing lines to a driving circuit; and
a dummy electrode disposed between the first touch electrode and the second touch electrode, wherein a line width of the dummy electrode in an area far away from the pad unit is wider than a line width of the dummy electrode in an area close to the pad unit,
wherein the sensing lines have different line widths.

2. The touch screen of claim 1 , wherein:
line widths of the some of the plurality of sensing lines connected to the first touch electrode are decreased toward the pad unit.

3. The touch screen of claim 1 , wherein:
line widths of the plurality of sensing lines are decreased toward the pad unit.

4. The touch screen of claim 1 , wherein:
the sensing area is divided into a first area disposed in an upper portion with reference to a center area and a second area disposed in a lower portion with reference to the center area on a plan view.

5. The touch screen of claim 4 , wherein the first touch electrode is a first touch electrode disposed in the first area and the second touch electrode is a second touch electrode disposed in the second area, further comprising:
a first touch electrode disposed in the second area, and
a second touch electrode disposed in the first area,
wherein:
a size of the first touch electrode disposed in the first area is different from a size of the first touch electrode disposed in the second area,
and a size of the second touch electrode disposed in the first area is different from a size of the second touch electrode disposed in the second area.

6. The touch screen of claim 4 , further comprising:
a plurality of first touch electrodes in the first area comprising the first touch electrode,
a plurality of first touch electrodes in the second area,
a first bridge electrode which electrically connects pairs of the plurality of first touch electrodes in the first area and a second bridge electrode which electrically connects pairs of the plurality of first touch electrodes in the second area.

7. The touch screen of claim 6 , wherein:
a line width of the second bridge electrode is larger than a line width of the first bridge electrode.

8. The touch screen of claim 6 , wherein:
the second bridge electrode includes a pair of metal patterns.

9. The touch screen of claim 1 , wherein:
a thickness of the first touch electrode and a thickness of the second touch electrode is decreased toward the pad unit.

10. A display device comprising:
a display panel displaying an image; and
a touch screen disposed on a front surface of the display panel,
the touch screen includes
a base substrate including a sensing area and a peripheral area enclosing an edge of the sensing area;
a first touch electrode disposed in the sensing area and extending in a first direction;
a second touch electrode disposed in the sensing area and extending in a second direction which crosses the first direction;
a plurality of sensing lines disposed in the peripheral area, wherein some of the plurality of sensing lines are each connected to the first touch electrode and some of the plurality of sensing lines are each connected at one end to the second touch electrode;
a pad unit disposed in the peripheral area and connected to an other end of each of the plurality of sensing lines to electrically connect the sensing lines to a driving circuit; and
a dummy electrode disposed between the first touch electrode and the second touch electrode, wherein a line width of the dummy electrode in an area far away from the pad unit is wider than a line width of the dummy electrode in an area close to the pad unit,
wherein the sensing lines have different line widths.

11. The display device of claim 10 , wherein:
line widths of the some of the plurality sensing lines connected to the first touch electrode are decreased toward the pad unit.

12. The display device of claim 10 , wherein:
line widths of the plurality of sensing lines are decreased toward the pad unit.

13. The display device of claim 10 , wherein:
the sensing area is divided into a first area disposed in an upper portion with reference to a center area and a second area disposed in a lower portion with reference to the center area on a plan view.

14. The display device of claim 13 ,
wherein the first touch electrode is a first touch electrode disposed in the first area and the second touch electrode is a second touch electrode disposed in the second area, further comprising:
a first touch electrode disposed in the second area, and
a second touch electrode disposed in the first area.

15. The display device of claim 13 , further comprising:
a plurality of first touch electrodes in the first area comprising the first touch electrode,
a plurality of first touch electrodes in the second area,
a first bridge electrode which electrically connects pairs of the first touch electrodes in the first area and a second bridge electrode which electrically connects pairs of the first touch electrodes in the second area.

16. The display device of claim 15 , wherein:
a line width of the second bridge electrode is larger than a line width of the first bridge electrode.

17. The display device of claim 15 , wherein:
the second bridge electrode in the second area includes a pair of metal patterns.

18. The display device of claim 10 , wherein:
a thickness of each of the first touch electrode and the second touch electrode is decreased toward the pad unit.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Dae Won

Classifications

• G06F3/044

  by capacitive means · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/047

  using sets of wires, e.g. crossed wires · CPC title

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F2203/04111

  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 title