Touch panel and organic light emitting diode display panel

• US 10,698,547 B2
• Filed: 12/21/2018
• Issued: 06/30/2020
• Est. Priority Date: 08/06/2018
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Li, Bo
• Primary Examiner(s): Sheng, Tom V
• Application Number:
  US16/230,855
• Publication Number:
  US 20200042116A1
• Time in Patent Office: 557 Days
• 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 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/65 OLEDs integrated with inorganic image sensors
• CPC Class Codes: H10K 59/873 Encapsulations

Abstract

Disclosed is a touch panel and a corresponding organic light emitting diode display panel. A metal grid touch line is fabricated on an encapsulation layer of a flexible organic light emitting diode display panel, and is not positioned in a light emitting area of a pixel point, and traced in a middle of adjacent pixel points. At least one electrode of a driving electrode and a sensing electrode is conducted with a metal bridge thereunder, and a floating electrode is disposed in the driving electrode or the sensing electrode to realize a flexible touch panel, to reduce a thickness of a film by reducing use of transparent optical adhesive and improve a touch effect.

Claims

1. A touch panel, comprising:

a plurality of first touch electrode strings arranged in a first direction, wherein each of the first touch electrode strings comprises a plurality of first grid electrodes which are electrically connected;

each of the first grid electrodes at least comprises a plurality of first metal grid bars spaced and connected, and a first floating electrode is disposed between adjacent two first metal grid bars;

a plurality of second touch electrode strings in a same layer that intersect with the plurality of first touch electrode strings arranged in a second direction, wherein each of the second touch electrode strings comprises a plurality of second grid electrodes;

each of the second grid electrodes comprises a plurality of second metal grid bars spaced and connected, and a second floating electrode is disposed between adjacent two second metal grid bars;

an insulating layer, disposed between a metal bridge and the first grid electrode, the second grid electrode to insulate the plurality of first touch electrode strings and the plurality of second touch electrode strings;

wherein adjacent edges of the first grid electrode and the second grid electrode are staggered, and electrical separations between the first metal grid bar and the adjacent second metal grid bar, between the first metal grid bar and the adjacent first floating electrode and between the second metal grid bar and the adjacent second floating electrode are achieved by slight breaks therebetween.

2. The touch panel according to claim 1, wherein two ends of the metal bridge are connected with two adjacent second grid electrodes with through holes provided in the insulating layer.

3. The touch panel according to claim 2, wherein the metal bridge further connects the second grid electrode and the first floating electrode of the first grid electrode adjacent to the second grid electrode with a through hole disposed in the insulating layer.

4. The touch panel according to claim 3, wherein staggered edges of the first touch electrode string and the second touch electrode string possess a pulsed edge or a zigzag edge.

5. The touch panel according to claim 4, wherein the first metal grid bar and the second metal grid bar are made of titanium aluminum titanium three-layer composite metal, and the metal bridge is made of titanium aluminum titanium three-layer composite metal or molybdenum aluminum molybdenum three-layer composite metal.

6. The touch panel according to claim 5, wherein the metal bridge is a metal grid bridge, and the metal bridge comprises at least one third metal line, which is electrically connected, and the metal bridge formed by the third metal line is linear, X-shaped or double X-shaped as a whole.

7. The touch panel according to claim 6, wherein the first touch electrode string is one of a driving electrode and a sensing electrode, and the second touch electrode string is an other of the driving electrode and the sensing electrode.

8. The touch panel according to claim 6, wherein widths of the first metal grid bar, the second metal grid bar and the third metal line in the metal bridge are within a range of 0.5 μ

m to 5 μ

m.

9. The touch panel according to claim 6, wherein a diameter of the through hole does not exceed a distance of adjacent pixel points;

and a distance of the slight breaks is within a range of 3 μ

m to 20 μ

m.

10. An organic light emitting diode display panel, which comprises a substrate, an organic light emitting diode layer disposed on the substrate and an encapsulation layer disposed above the organic light emitting diode layer, further comprising:

a substrate layer disposed on the encapsulation layer;

a touch panel disposed on the substrate layer;

a protective layer disposed on the touch panel;

wherein the touch panel comprises;

a plurality of first touch electrode strings arranged in a first direction, wherein each of the first touch electrode strings comprises a plurality of first grid electrodes which are electrically connected;

each of the first grid electrodes at least comprises a plurality of first metal grid bars spaced and connected, and a first floating electrode is disposed between adjacent two first metal grid bars;

a plurality of second touch electrode strings in a same layer that intersect with the plurality of first touch electrode strings arranged in a second direction, wherein each of the second touch electrode strings comprises a plurality of second grid electrodes;

each of the second grid electrodes comprises a plurality of second metal grid bars spaced and connected, and a second floating electrode is disposed between adjacent two second metal grid bars;

an insulating layer, disposed between a metal bridge and the first grid electrode, the second grid electrode to insulate the plurality of first touch electrode strings and the plurality of second touch electrode strings;

wherein adjacent edges of the first grid electrode and the second grid electrode are staggered, and electrical separations between the first metal grid bar and the adjacent second metal grid bar, between the first metal grid bar and the adjacent first floating electrode and between the second metal grid bar and the adjacent second floating electrode are achieved by slight breaks therebetween.

11. The organic light emitting diode display panel according to claim 10, wherein two ends of the metal bridge are connected with two adjacent second grid electrodes with through holes provided in the insulating layer.

12. The organic light emitting diode display panel according to claim 11, wherein the metal bridge further connects the second grid electrode and the first floating electrode of the first grid electrode adjacent to the second grid electrode with a through hole disposed in the insulating layer.

13. The organic light emitting diode display panel according to claim 12, wherein staggered edges of the first touch electrode string and the second touch electrode string possess a pulsed edge or a zigzag edge.

14. The organic light emitting diode display panel according to claim 13, wherein the first metal grid bar and the second metal grid bar are made of titanium aluminum titanium three-layer composite metal, and the metal bridge is made of titanium aluminum titanium three-layer composite metal or molybdenum aluminum molybdenum three-layer composite metal.

15. The organic light emitting diode display panel according to claim 14, wherein the metal bridge is a metal grid bridge, and the metal bridge comprises at least one third metal line, which is electrically connected, and the metal bridge formed by the third metal line is linear, X-shaped or double X-shaped as a whole.

16. The organic light emitting diode display panel according to claim 15, wherein the first touch electrode string is one of a driving electrode and a sensing electrode, and the second touch electrode string is an other of the driving electrode and the sensing electrode.

17. The organic light emitting diode display panel according to claim 15, wherein widths of the first metal grid bar, the second metal grid bar and the third metal line in the metal bridge are within a range of 0.5 μ

m to 5 μ

m.

18. The organic light emitting diode display panel according to claim 15, wherein a diameter of the through hole does not exceed a distance of adjacent pixel points;

and a distance of the slight breaks is within a range of 3 μ

m to 20 μ

m.