Touch screen element

• US 9,430,104 B2
• Filed: 02/10/2014
• Issued: 08/30/2016
• Est. Priority Date: 05/05/2006
• Status: Active Grant

• Current Assignee: Atmel Corporation (Microchip Technology Incorporated)
• Original Assignee: Atmel Corporation (Microchip Technology Incorporated)
• Inventors: Philipp, Harald
• Primary Examiner(s): Sitta, Grant
• Application Number:
  US14/176,619
• Publication Number:
  US 20140152919A1
• Time in Patent Office: 932 Days
• Field of Search: 345156-175
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A capacitive two-dimensional (2D) touch panel has three sets of interleaved electrodes. A first set of electrodes is spaced apart along the y-direction and these are galvanically connected to each other by a resistive strip connected at either end to a connection line. A second set of electrodes is also arrayed along the y-direction and these are galvanically connected to each other via a notionally non-resistive first connection. A third set of electrodes is also arrayed along the y-direction and these are galvanically connected to each other via a notionally non-resistive second connection. The second and third sets of electrodes are interleaved without galvanic cross-conduction to provide a gradient along the x-direction to resolve touch position in the x-direction. The first set of electrodes resolves touch position along the y-direction. Passive or active capacitive sensing techniques may be used to acquire the position information from the 2D touch panel.

Claims

1. A touch sensor comprising:

a plurality of first electrodes, each extending in a first direction;

a resistive voltage divider directly coupled to each of the first electrodes and extending in a second direction, the resistive voltage divider configured to provide a stepwise progression in voltage reduction between a first one of the first electrodes and each succeeding first electrode along the second direction to provide second direction touch position information; and

a plurality of pairs of second and third electrodes, each pair being disposed between adjacent first electrodes, wherein the electrical coupling of the second electrodes or the electrical coupling of the third electrodes are separated from the first electrodes by dielectric areas deposited on the first electrodes, and wherein the second electrodes are electrically coupled to each other and the third electrodes are electrically coupled to each other to provide first direction touch position information.

2. The touch sensor of claim 1, wherein the second and third electrodes each have a triangular shape.

3. The touch sensor of claim 1, wherein each pair of second and third electrodes co-extend into each other in the first direction with interdigitation in the second direction.

4. The touch sensor of claim 1, wherein each of the second and third electrodes has a crenellated shape.

5. The touch sensor of claim 1, wherein:

the first electrodes comprise drive electrodes; and

the second and third electrodes comprise sense electrodes.

6. The touch sensor of claim 1, wherein the resistive voltage divider is incorporated into at least one of the plurality of first electrodes and comprises a portion extending in the second direction that interconnects with an adjacent first electrode.

7. The touch sensor of claim 1, wherein the resistive voltage divider extends into a cutout of at least one of the plurality of first electrodes, the cutout of an electrode comprising an opening at one of the electrode where electrode material has been removed.

8. The touch sensor of claim 1, further comprising:

a connector coupled to the first one of the first electrodes; and

a connector coupled to a last one of the first electrodes.

9. The touch sensor of claim 8, further comprising at least one additional connector coupled to one of the first electrodes between the first one and the last one of the first electrodes.

10. The touch sensor of claim 1, wherein the resistive voltage divider and the first electrodes are formed in a single layer of material.

17. The touch sensor of claim 1, wherein each intermediate first electrode is coupled to adjacent first electrodes at alternating ends of the each intermediate first electrode using resistive routing.

11. A device, comprising:

a touch sensor comprising;

a plurality of first electrodes, each extending in a first direction;

a resistive voltage divider directly coupled to each of the first electrodes and extending in a second direction, the resistive voltage divider configured to provide a stepwise progression in voltage reduction between a first one of the first electrodes and each succeeding first electrode along the second direction to provide second direction touch position information; and

a plurality of pairs of second and third electrodes, each pair being disposed between adjacent first electrodes, wherein the second electrodes are electrically coupled to each other and the third electrodes are electrically coupled to each other to provide first direction touch position information;

a controller coupled to the touch sensor and operable to control the touch sensor;

a first connector coupled to a first one of the first electrodes;

a second connector coupled to a last one of the first electrodes; and

at least one additional connector coupled to one of the first electrodes between the first one and the last one of the first electrodes.

12. The device of claim 11, wherein the second and third electrodes each have a triangular shape.

13. The device of claim 11, wherein each pair of second and third electrodes co-extend into each other in the first direction with interdigitation in the second direction.

14. The device of claim 11, wherein each of the second and third electrodes has a crenellated shape.

15. The device of claim 11, wherein:

the first electrodes comprise drive electrodes; and

the second and third electrodes comprise sense electrodes.

16. A device, comprising:

a touch sensor comprising;

a plurality of first electrodes, each extending in a first direction;

a resistive voltage divider that is directly coupled to each of the first electrode and extends in a second direction, the resistive voltage divider configured to provide a stepwise progression in voltage reduction between a first one of the first electrodes and each succeeding first electrode along the second direction to provide second direction touch position information; and

a plurality of pairs of second and third electrodes, each pair being disposed between adjacent first electrodes, wherein the electrical coupling of the second electrodes or the electrical coupling of the third electrodes are separated from the first electrodes by dielectric areas deposited on the first electrodes, and wherein the second electrodes are electrically coupled to each other and the third electrodes are electrically coupled to each other to provide first direction touch position information; and

a controller coupled to the touch sensor and operable to control the touch sensor.

18. The device of claim 16, further comprising a display coupled with the touch sensor.

19. The device of claim 16, wherein the second and third electrodes each have a triangular shape.

20. The device of claim 16, wherein each pair of second and third electrodes co-extend into each other in the first direction with interdigitation in the second direction.

21. The device of claim 16, wherein each of the second and third electrodes has a crenellated shape.

22. The device of claim 16, wherein:

the first electrodes comprise drive electrodes; and

the second and third electrodes comprise sense electrodes.

23. The device of claim 16, wherein the resistive voltage divider is incorporated into at least one of the plurality of first electrodes and comprises a portion extending in the second direction that interconnects with an adjacent first electrode.

24. The device of claim 16, wherein the resistive voltage divider extends into a cutout of at least one of the plurality of first electrodes, the cutout of an electrode comprising an opening at one of the electrode where electrode material has been removed.

25. The device of claim 16, further comprising:

a connector coupled to a first one of the first electrodes;

a connector coupled to a last one of the first electrodes; and

at least one additional connector coupled to one of the first electrodes between the first one and the last one of the first electrodes.