Touch panel with parallel electrodes

• US 8,411,048 B2
• Filed: 07/15/2009
• Issued: 04/02/2013
• Est. Priority Date: 12/26/2008
• Status: Active Grant

• Current Assignee: Higgstec, Inc.
• Original Assignee: Higgstec, Inc.
• Inventors: Yeh, Herng-Ming, Chen, Yi-Ta
• Primary Examiner(s): DINH, DUC Q
• Application Number:
  US12/503,178
• Publication Number:
  US 20100164902A1
• Time in Patent Office: 1,357 Days
• Field of Search: 345173-181
• US Class Current: 345/173
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

The disclosure discloses a touch panel with parallel electrodes. The parallel electrodes mainly include a pair of parallel electrodes in x-axis and a pair of parallel electrodes in y-axis, further forming a ring structure by means of a series connection of eight corner resistances. The ring structure is the improvement of the electrode design, and is formed on the conductive layer of touch panel with a chain of series resistances. The voltage support of the conductive layer of the ring structure is provided by the corner electrodes on the conductive layer for touch detection.

Claims

1. A touch panel with parallel electrodes, comprising:

a substrate;

a conductive layer, formed on the substrate, the conductive layer comprising an internal contact area and an edge resistance around the internal contact area;

a plurality of corner electrodes, connected to the corner of the edge resistance;

a pair of parallel electrodes in x-axis, connected to a voltage controlled unit and isolated from the edge resistance, formed out of both sides in x-axis direction of the edge resistance of the conductive layer;

a pair of parallel electrodes in y-axis, connected to the voltage controlled unit and isolated from the edge resistance, formed out of both sides in y-axis direction of the edge resistance of the conductive layer; and

a plurality of corner resistances, each of the plurality of corner resistances comprises two terminals, one terminal is connected to either the parallel electrode in x-axis or the parallel electrode in y-axis, and the other is connected to one terminal of the plurality of corner electrodes.

2. The touch panel with parallel electrodes according to claim 1, wherein the parallel electrodes in x-axis, the parallel electrodes in y-axis and the plurality of corner electrodes are selected from the groups of silver conductive wires, molybdenum/aluminum/molybdenum metal layers and chromium conductive wires.

3. The touch panel with parallel electrodes according to claim 1, wherein the parallel electrodes in x-axis, the parallel electrodes in y-axis and the plurality of corner electrodes are the silver conductive wires which are fabricated using silver paste at a temperature above 500□

.

4. The touch panel with parallel electrodes according to claim 1, wherein the plurality of corner electrodes are L-shaped and formed between the gaps of the plurality of corner electrodes and the parallel electrodes in x-axis or the parallel electrodes in y-axis.

5. The touch panel with parallel electrodes according to claim 1, wherein the edge resistance is a chain of series resistances.

6. The touch panel with parallel electrodes according to claim 1, wherein the resistance of the edge resistance is from 2 k to 5 kΩ

, and the resistance of the plurality of corner electrodes resistances are from 2 k to 5 kΩ

.

7. The touch panel with parallel electrodes according to claim 1, wherein the plurality of corner electrodes resistances are equal.

8. The touch panel with parallel electrodes according to claim 1, further comprising:

a plurality of conductive wires used for the connecting between the parallel electrodes in x-axis or the parallel electrodes in y-axis to the voltage controlled unit.

9. A touch panel with parallel electrodes, comprising:

a substrate;

a conductive layer, formed on the substrate, the conductive layer comprising an internal contact area and an edge resistance around the internal contact area;

a plurality of corner electrodes, connected to the corner of the edge resistance;

a pair of parallel electrodes in x-axis, connected to a voltage controlled unit and isolated from the edge resistance, formed out of both sides in x-axis direction of the edge resistance of the conductive layer;

a pair of parallel electrodes in y-axis, connected to the voltage controlled unit and isolated from the edge resistance, formed out of both sides in y-axis direction of the edge resistance of the conductive layer; and

a plurality of corner resistances, each of the plurality of corner resistances comprising two terminals, one connected either to the x-axis parallel electrode or the y-axis parallel electrode, and the other connected to one terminal of the plurality of corner electrodes;

wherein the voltage controlled unit provides a source voltage and a reference voltage to the parallel electrode in y-axis and is connected in a floating manner to the parallel electrode in x-axis to detect the touch coordination in y-axis, and provides the source voltage and the reference voltage to the x-axis parallel electrode and is connected in a floating manner to the parallel electrode in y-axis to detect the touch coordination in x-axis.

10. The touch panel with parallel electrodes according to 9, wherein the parallel electrodes in x-axis, the parallel electrodes in y-axis and the plurality of corner electrodes are selected from the groups of silver conductive wires, molybdenum/aluminum/molybdenum metal layers and chromium conductive wires.

11. The touch panel with parallel electrodes according to claim 9, wherein the parallel electrodes in x-axis, the parallel electrodes in y-axis and the plurality of corner electrodes are the silver conductive wires which are fabricated by silver paste above 500□

.

12. The touch panel with parallel electrodes according to claim 9, wherein the plurality of corner electrodes are L-shaped and formed between the gaps of the plurality of corner electrodes and the parallel electrodes in x-axis or the parallel electrodes in y-axis.

13. The touch panel with parallel electrodes according to claim 9, wherein the edge resistance is a chain of series resistances.

14. The touch panel with parallel electrodes according to claim 9, wherein the resistance of the edge resistance is from 2 k to 5 kΩ

, and the resistance of the plurality of corner electrodes resistances are from 2 k to 5 kΩ

.

15. The touch panel with parallel electrodes according to claim 9, wherein the plurality of corner electrodes resistances are equal to each other.

16. The touch panel with parallel electrodes according to claim 9, further comprising:

a plurality of conductive wires, used for the connecting between the parallel electrodes in x-axis or the parallel electrodes in y-axis to the voltage controlled unit.

17. The touch panel with parallel electrodes according to claim 9, wherein the source voltage is from 1.5 to 15V, and the reference voltage is ground connection.