TOUCH PANEL, DISPLAY, AND MANUFACTURING METHOD OF TOUCH PANEL

• US 20100045613A1
• Filed: 12/22/2008
• Published: 02/25/2010
• Est. Priority Date: 08/20/2008
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chien, Yu-Feng, Wu, Yuan-Chun, Lee, Hsin-Hung, Ma, Mei-Sheng, Cheng, Kuo-Hsing
• Application Number:
  US12/342,049
• Publication Number:
  US 20100045613A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• 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 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• 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

Abstract

A touch panel including a substrate, at least one first sensing series and at least one second sensing series is provided. The first sensing series is disposed on the substrate and extends along a first direction. The first sensing series includes several first sensing pads and at least one first bridge line. The first bridge line connects two adjacent first sensing pads, and a material of the first bridge line differs from a material of the first sensing pads. The second sensing series is disposed on the substrate and extends along a second direction. The first direction is different from the second direction. The second sensing series includes several second sensing pads and at least one second bridge line. The second bridge line connects two adjacent second sensing pads.

Claims

1. A touch panel, comprising:

a substrate;

at least one first sensing series, disposed on the substrate and extending along a first direction, the first sensing series comprising;

a plurality of first sensing pads; and

at least one first bridge line, wherein the first bridge line is connected with two adjacent first sensing pads, and a material of the first bridge line is differing from a material of the first sensing pads; and

at least one second sensing series, disposed on the substrate and extending along a second direction, wherein the first direction is different from the second direction, the second sensing series comprising;

a plurality of second sensing pads; and

at least one second bridge line, wherein the second bridge line is connected with two adjacent second sensing pads.

2. The touch panel as claimed in claim 1, wherein the material of the first sensing pads comprises transparent conductive oxide, and the material of the first bridge lines comprises metal.

3. The touch panel as claimed in claim 1, wherein at least a portion of the second bridge lines have a conductivity higher than a conductivity of the second sensing pads, a material of the second sensing pads comprises transparent conductive oxide, and a material of the second bridge lines comprises metal.

4. The touch panel as claimed in claim 1, wherein the first sensing pads are co-planar with the second sensing pads.

5. The touch panel as claimed in claim 1, further comprising a first dielectric layer, disposed on the substrate to cover the first sensing series and the second sensing pads, wherein the first dielectric layer has a plurality of windows, and the second bridge lines are disposed on the first dielectric layer, the second bridge lines being connected to the second sensing pads through the windows.

6. The touch panel as claimed in claim 5, further comprising a second dielectric layer, disposed on the first dielectric layer to cover the first sensing series and the second sensing series.

7. The touch panel as claimed in claim 1, further comprising a first dielectric layer, disposed on the substrate and covering the first sensing series, the first dielectric layer having a plurality of openings corresponding to the second sensing pads, the second sensing pads being disposed inside the corresponding openings, each of the second bridge lines crossing over the first dielectric layer between two adjacent openings and connecting the two adjacent second sensing pads correspondingly.

8. The touch panel as claimed in claim 7, further comprising a second dielectric layer, disposed on the first dielectric layer and covering the first sensing series and the second sensing series.

9. The touch panel as claimed in claim 1, further comprising a first dielectric layer, disposed on the substrate and covering the first bridge lines, wherein the first sensing pads and the second sensing series are disposed on the first dielectric layer, the first dielectric layer has a plurality of windows, and the first bridge lines connect the first sensing pads through the corresponding windows.

10. The touch panel as claimed in claim 9, further comprising a second dielectric layer, disposed on the first dielectric layer and covering the first sensing series and the second sensing series.

11. The touch panel as claimed in claim 1, further comprising a plurality of fan-out traces, disposed on the substrate, wherein the fan-out traces are connected to the first sensing series and the second sensing series, and a material of the fan-out traces is substantially the same as the material of the first sensing pads.

12. The touch panel as claimed in claim 1, further comprising a plurality of fan-out traces, disposed on the substrate, wherein the fan-out traces are connected to the first sensing series and the second sensing series, and a material of the fan-out traces substantially differs from the material of the first bridge lines.

13. The touch panel as claimed in claim 1, wherein a sheet resistance of the first bridge line is about 0.01 Ω

/□

to 1000 Ω

/□

, and a sheet resistance of the first sensing pad is about 0.01 Ω

/□

to 1000 Ω

/□

.

14. The touch panel as claimed in claim 1, wherein the first bridge line is connected with all of the first sensing pads.

15. The touch panel as claimed in claim 1, wherein a conductivity of the first bridge line is higher than a conductivity of the first sensing pads.

16. The touch panel as claimed in claim 1, wherein an sheet resistance of the first bridge line is lower than an sheet resistance of the first sensing pads.

17. The touch panel as claimed in claim 1, wherein the first sensing series further comprises at least one first auxiliary bridge line connecting two other adjacent first sensing pads, a material of the first auxiliary bridge line is the same as the material of the first sensing pads, and the first auxiliary bridge line is co-planar with the first sensing pads.

18. The touch panel as claimed in claim 17, wherein the second sensing series further comprises at least one second auxiliary bridge line connecting two other adjacent second sensing pads of the second sensing pads, a material of the second auxiliary bridge line is the same as a material of the second sensing pads, and the second auxiliary bridge line is co-planar with the second sensing pads.

19. A display, comprising:

a touch panel, comprising;

a substrate;

at least one first sensing series, disposed on the substrate and extending along a first direction, the first sensing series comprising;

a plurality of first sensing pads; and

at least one first bridge line, wherein the first bridge line is connected with two adjacent first sensing pads, and a material of the first bridge line is differing from a material of the first sensing pads; and

at least one second sensing series, disposed on the substrate and extending along a second direction, wherein the first direction is different from the second direction, the second sensing series comprising;

a plurality of second sensing pads; and

at least one second bridge line, wherein the second bridge line is connected with two adjacent second sensing pads; and

a display panel, electrically connected to the touch panel.

20. A manufacturing method of a touch panel, comprising:

forming a plurality of first sensing pads, a plurality of first bridge lines and a plurality of second sensing pads on a substrate so that the first sensing pads, the first bridge lines and the second sensing pads are co-planar with one another;

forming a first dielectric layer on the substrate to cover the first sensing pads, the first bridge lines and the second sensing pads;

forming a plurality of windows inside the first dielectric layer; and

forming a plurality of second bridge lines on the first dielectric layer so that each of the second bridge lines is connected to the corresponding second sensing pads through the corresponding windows,

wherein;

the first sensing pads and the first bridge lines constitute a first sensing series extending along a first direction;

each of the first bridge lines is connected with two adjacent first sensing pads;

a conductivity of at least a portion of the first bridge lines is higher than a conductivity of the first sensing pads;

the second sensing pads and the second bridge lines constitute a second sensing series extending along a second direction;

the first direction differs from the second direction; and

each of the second bridge lines is connected with two adjacent sensing pads.

21. The manufacturing method of the touch panel as claimed in claim 20, further comprising forming a second dielectric layer on the first dielectric layer to cover the first sensing series and the second sensing series.

22. A manufacturing method of a touch panel, comprising:

forming a first sensing series extending along a first direction, and comprising a plurality of first sensing pads and a plurality of first bridge lines on a substrate;

forming a first dielectric layer on the substrate to cover the first sensing series;

forming a plurality of openings inside the first dielectric layer; and

forming a second sensing series extending along a second direction, comprising a plurality of second sensing pads and a plurality of second bridge lines, wherein the second sensing pads of the second sensing series are formed inside the corresponding openings and co-planar with the first sensing pads, and the second bridge lines of the second sensing series cross over the first dielectric layer between two adjacent openings of the openings to connect the two adjacent second sensing pads correspondingly,

wherein;

each of the first bridge lines is connected with two adjacent first sensing pads;

a conductivity of at least a portion of the first bridge lines is higher than a conductivity of the first sensing pads; and

the first direction differs from the second direction.

23. The manufacturing method of the touch panel as claimed in claim 22, further comprising forming a second dielectric layer on the first dielectric layer to cover the first sensing series and the second sensing series.

24. A manufacturing method of a touch panel, comprising:

forming a plurality of first bridge lines on a substrate;

forming a first dielectric layer on the substrate to cover the first bridge lines;

forming a plurality of windows inside the first dielectric layer; and

forming a plurality of first sensing pads and a second sensing series comprising a plurality of second sensing pads and a plurality of second bridge lines on the first dielectric layer, wherein the first sensing pads, the second sensing pads and the second bridge lines are co-planar with one another, and the first sensing pads is connected to the corresponding first bridge lines through the corresponding windows respectively,

wherein;

the first sensing pads and the first bridge lines constitute a first sensing series extending along a first direction.

each of the first bridge lines is connected with two adjacent first sensing pads;

a conductivity of at least a portion of the first bridge lines is higher than a conductivity of the first sensing pads;

the second sensing series extends along a second direction, and the first direction differs from the second direction; and

each of the second bridge lines is connected with two adjacent sensing pads.