Touch panel and display device including the same

Patent metadata

Field	Value
Publication number	US-10691231-B2
Application number	US-201715629374-A
Country	US
Kind code	B2
Filing date	Jun 21, 2017
Priority date	Aug 2, 2016
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A touch panel includes: a substrate including a touch recognition area and a fingerprint recognition area; a first driving electrode and a first sensing electrode insulated from each other on the substrate and each positioned in the touch recognition area; and a second driving electrode and a second sensing electrode insulated from each other on the substrate and each positioned in the fingerprint recognition area. At least one of the second driving electrode and the second sensing electrode includes: a stem portion; and a branch portion branching off from the stem portion.

First claim

What is claimed is:

1. A touch panel comprising:
a substrate comprising a touch recognition area and a fingerprint recognition area;
a first driving electrode and a first sensing electrode insulated from each other on the substrate and each positioned in the touch recognition area; and
a second driving electrode and a second sensing electrode insulated from each other on the substrate and each positioned in the fingerprint recognition area,
wherein at least one of the second driving electrode and the second sensing electrode comprises:
a stem portion extending in a first direction; and
a plurality of branch portions directly connected to and branching off from the stem portion in a second direction and a third direction opposite to the second direction, in the same layer.

2. The touch panel as claimed in claim 1 , further comprising an auxiliary branch portion branching off from the branch portion.

3. The touch panel as claimed in claim 1 , wherein the stem portion has a zig-zag shape.

4. The touch panel as claimed in claim 3 , wherein the second driving electrode and the second sensing electrode further comprise an auxiliary branch portion bent from the branch portion to extend therefrom.

5. The touch panel as claimed in claim 1 , wherein the second driving electrode and the second sensing electrode each have a zig-zag shape.

6. The touch panel as claimed in claim 1 , wherein adjacent ones of the branch portions are connected to one another.

7. The touch panel as claimed in claim 1 , wherein an area of the fingerprint recognition area is substantially an integer multiple of an area of the first driving electrode or an area of the first sensing electrode.

8. The touch panel as claimed in claim 1 , wherein the first driving electrode or the first sensing electrode has an area having a magnitude from about several square millimeters (mm 2 ) to about several tens of square millimeters.

9. The touch panel as claimed in claim 8 , wherein the second driving electrode and the second sensing electrode have a pitch having a magnitude from about several micrometers (μm) to about several tens of micrometers.

10. The touch panel as claimed in claim 1 , further comprising:
a first routing wiring connected to the first driving electrode;
a second routing wiring connected to the first sensing electrode; and
a touch driving unit connected to the first routing wiring and the second routing wiring.

11. The touch panel as claimed in claim 10 , further comprising:
a third routing wiring connected to the second driving electrode;
a fourth routing wiring connected to the second sensing electrode; and
a fingerprint recognition unit connected to the third routing wiring and the fourth routing wiring.

12. The touch panel as claimed in claim 11 , wherein the touch driving unit and the fingerprint recognition unit oppose each other.

13. The touch panel as claimed in claim 1 , wherein the stem portion and the branch portion have an included angle that is an angle between about 80 degrees and about 100 degrees.

14. The touch panel as claimed in claim 2 , wherein the branch portion and the auxiliary branch portion have an included angle that is an angle between about 80 degrees and about 100 degrees.

15. The touch panel as claimed in claim 2 , wherein the auxiliary branch portion is substantially parallel to the stem portion.

16. The touch panel as claimed in claim 1 , wherein the fingerprint recognition area is positioned at a central portion of at least one edge portion of the substrate.

17. A touch panel comprising:
a substrate comprising a touch recognition area and a fingerprint recognition area;
a first driving electrode and a first sensing electrode insulated from each other on the substrate and each positioned in the touch recognition area; and
a second driving electrode and a second sensing electrode insulated from each other on the substrate and each positioned in the fingerprint recognition area,
wherein the second driving electrode and the second sensing electrode comprise:
a plurality of unit electrodes, wherein each of the plurality of unit electrodes overlaps with four pixels forming one unit pixel in plan view; and
a connecting wiring connecting the unit electrodes.

18. The touch panel as claimed in claim 17 , wherein the unit electrodes have shapes each selected from: a triangular shape, a quadrangular shape, and a lozenge shape.

19. The touch panel as claimed in claim 17 , wherein the first driving electrode or the first sensing electrode has an area having a magnitude from about several square millimeters (mm 2 ) to about several tens of square millimeters.

20. The touch panel as claimed in claim 19 , wherein the unit electrode has an area having a magnitude from about several tens of square micrometers (μm 2 ) to about several hundreds of square micrometers.

21. A display device comprising:
a display panel comprising a plurality of pixels configured to display an image; and
a touch panel on the display panel,
wherein the touch panel comprises:
a first driving electrode and a first sensing electrode insulated from each other on the display panel and each positioned in a touch recognition area; and
a second driving electrode and a second sensing electrode insulated from each other on the display panel and each positioned in a fingerprint recognition area,

wherein at least one of the second driving electrode and the second sensing electrode comprises:
a stem portion extending in a first direction; and
a plurality of branch portions directly connected to and branching off from the stem portion in a second direction and a third direction opposite to the second direction in the same layer, and

wherein the second driving electrode and the second sensing electrode are disposed proximate to a boundary of the plurality of pixels.

22. The display device as claimed in claim 21 , further comprising an auxiliary branch portion branching off from the branch portion.

23. The display device as claimed in claim 21 , wherein the stem portion has a zig-zag shape.

24. The display device as claimed in claim 21 , wherein the second driving electrode and the second sensing electrode further comprise an auxiliary branch portion bent from the branch portion to extend therefrom.

25. The display device as claimed in claim 21 , wherein the second driving electrode and the second sensing electrode have a zig-zag shape.

26. The display device as claimed in claim 21 , wherein adjacent ones of the branch portions are connected to one another.

27. A display device comprising:
a display panel comprising a plurality of pixels displaying an image; and
a touch panel on the display panel,
wherein the touch panel comprises:
a first driving electrode on the display panel and positioned in a touch recognition area;
a second driving electrode on the display panel and positioned in a fingerprint recognition area;
a first insulating layer on the first driving electrode and the second driving electrode, and covering the first driving electrode and the second driving electrode;
an adhesion layer on the first insulating layer;
a second insulating layer on the adhesion layer;
a first sensing electrode on the second insulating layer and positioned in the touch recognition area;
a second sensing electrode on the second insulating layer and positioned in the fingerprint recognition a

Assignees

• Samsung Display Co Ltd

Inventors

• Han Jeongyun
• Ko Gwangbum
• Na Hyunjae

Classifications

• G06V40/1306

  non-optical, e.g. ultrasonic or capacitive sensing · CPC title

• G06V40/1365

  Matching; Classification · CPC title

• G06F3/0445 Primary

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · 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

• G06F2203/04112

  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 title