CAPACITIVE TOUCH PANEL HAVING IMPROVED RESPONSE CHARACTERISTICS

• US 20150346873A1
• Filed: 08/04/2015
• Published: 12/03/2015
• Est. Priority Date: 07/23/2012
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Moyal, Nathan Y., Peng, Tao, Doorenbos, Jerry L., Cormier, Ronald F.
• Application Number:
  US14/818,073
• Publication Number:
  US 20150346873A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 3/0416 Control or interface arrangements specially adapted for digitisers
• 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

An apparatus is provided. The apparatus comprises a second layer disposed over a first layer. Each of the first and second layers have a set of detection electrodes that are spaced apart and electrically isolated from one another and an associated set of interleavers. Each interleaver is located between adjacent detection electrodes from its associated the set of detection electrodes, and each set of interleavers also includes a pair of complementary interleaving electrodes coupled to those that are electrically coupled to the adjacent detection electrodes from its associated set of detection electrodes. The detection electrodes and interleaving electrodes are also substantially transparent to visible spectrum light.

Claims

1. A touch panel sensor comprising:

a first detection electrode extending longitudinally;

a second detection electrode extending longitudinally and parallel with the first detection electrode, the second detection electrode spaced apart and electrically isolated from the first detection electrode;

a first set of interleaving electrodes extending from the first detection electrode without contacting the second detection electrode; and

a second set of interleaving electrodes extending from the second detection electrode without contacting the first detection electrode, the second set of interleaving electrodes interleaving with the first set of interleaving electrodes.

2. The touch panel sensor of claim 1, wherein the first detection electrode, the second detection electrode, the first set of interleaving electrodes, and the second set of interleaving electrodes are substantially transparent to visible spectrum light.

3. The touch panel sensor of claim 1, wherein:

the first set of interleaving electrodes are substantially perpendicular to the first and second detection electrodes; and

the second set of interleaving electrodes are substantially parallel with the first set of interleaving electrodes and substantially perpendicular to the first and second detection electrodes.

4. The touch panel sensor of claim 1, wherein the first set of interleaving electrodes from a first serpentine conductor with the first detection electrode, and the second set of interleaving electrodes from a second serpentine conductor with the second electrode.

5. The touch panel sensor of claim 1, wherein each of the first and second set of interleaving electrodes is substantially rectangular in shape.

6. The touch panel sensor of claim 1, wherein each of the first and second set of interleaving electrodes is substantially triangular in shape.

7. The touch panel sensor of claim 1, further comprising:

a first detection layer having;

a first substrate substantially transparent to visible spectrum light; and

a first conductive layer disposed on the first substrate and patterned to form the first and second detection electrodes and the first and second interleave electrodes in a horizontal direction; and

a second detection layer aligned with the first detection layer in a vertical direction perpendicular to the horizontal direction, the second detection layer having;

a second substrate substantially transparent to the visible spectrum light; and

a second conductive layer disposed on the second substrate and pattern to form third and fourth detection electrodes partially overlapping with the first and second electrodes along the horizontal direction.

8. The touch panel sensor of claim 7, wherein:

the third detection electrode is substantially perpendicular to the first and second detection electrodes along the horizontal direction and has a first extended electrode extending parallel with the first and second detection electrodes along the horizontal direction; and

the fourth detection electrode is arranged parallel with the third detection electrode, the fourth detection electrode is substantially perpendicular to the first and second detection electrodes along the horizontal direction and has a second extended electrode extending parallel with the first and second detection electrodes along the horizontal direction.

9. The touch panel sensor of claim 8, wherein:

the first extended electrode partially overlaps with the first and second sets of interleaving electrodes along the horizontal direction; and

the second extended electrode partially overlaps with the first and second sets of interleaving electrodes along the horizontal direction.

14. The display panel of claim 1, wherein each of the first and second set of interleaving electrodes is substantially rectangular in shape.

15. The display panel of claim 1, wherein each of the first and second set of interleaving electrodes is substantially triangular in shape.

16. The display panel of claim 1, wherein the second detection layer includes:

a third detection electrode isolated from and substantially perpendicular to the first and second electrodes, the third detection electrode having a first extended electrode extending parallel with the first and second detection electrodes; and

a fourth detection electrode isolated from and substantially perpendicular to the first and second electrodes, the fourth detection electrode having a second extended electrode extending parallel with the first and second detection electrodes without interleaving with the first extended electrode.

10. A display panel comprising:

a display screen operative to project visible light;

a first detection layer vertically aligned with the display screen and substantially transparent to the projected visible light, the first detection layer having;

a first detection electrode extending longitudinally along a first horizontal direction parallel with the display screen;

a second detection electrode extending longitudinally and parallel with the first detection electrode, the second detection electrode spaced apart and electrically isolated from the first detection electrode;

a first set of interleaving electrodes extending from the first detection electrode without contacting the second detection electrode; and

a second set of interleaving electrodes extending from the second detection electrode without contacting the first detection electrode, the second set of interleaving electrodes interleaving with the first set of interleaving electrodes; and

a second detection layer vertically aligned with the display screen and the first detection layer, the second detection layer substantially transparent to the projected visible light and configured to sense a touch event along a second horizontal direction substantially perpendicular to the first horizontal direction.

11. The display panel of claim 10, further comprising:

an insulation layer positioned between the first detection layer and the second detection layer.

12. The display panel of claim 10, wherein:

the first set of interleaving electrodes are substantially perpendicular to the first and second detection electrodes; and

the second set of interleaving electrodes are substantially parallel with the first set of interleaving electrodes and substantially perpendicular to the first and second detection electrodes.

13. The display panel of claim 10, wherein the first set of interleaving electrodes from a first serpentine conductor with the first detection electrode, and the second set of interleaving electrodes from a second serpentine conductor with the second electrode.

17. A display system comprising:

a display screen operative to project visible light;

a touch panel vertically aligned with the display screen and substantially transparent to the projected visible light, the touch panel having;

a first detection electrode extending longitudinally along a horizontal direction parallel with the display screen;

a second detection electrode extending longitudinally and parallel with the first detection electrode, the second detection electrode spaced apart and electrically isolated from the first detection electrode;

a first set of interleaving electrodes extending from the first detection electrode without contacting the second detection electrode; and

a second set of interleaving electrodes extending from the second detection electrode without contacting the first detection electrode, the second set of interleaving electrodes interleaving with the first set of interleaving electrodes; and

a control circuit coupled with the touch panel to detect a capacitance change in the first detection electrode and the second detection electrode.

18. The display system of claim 17, wherein:

the first set of interleaving electrodes are substantially perpendicular to the first and second detection electrodes; and

the second set of interleaving electrodes are substantially parallel with the first set of interleaving electrodes and substantially perpendicular to the first and second detection electrodes.

19. The display system of claim 17, wherein the first set of interleaving electrodes from a first serpentine conductor with the first detection electrode, and the second set of interleaving electrodes from a second serpentine conductor with the second electrode.

20. The display system of claim 17, further comprising:

a row detection layer having;

a first substrate substantially transparent to the projected visible light; and

a first conductive layer disposed on the first substrate and patterned to form the first and second detection electrodes and the first and second interleave electrodes along a row direction; and

a column detection layer vertically aligned with the row detection layer, the column detection layer having;

a second substrate substantially transparent to the projected visible light; and

a second conductive layer disposed on the second substrate and pattern to form third and fourth detection electrodes partially overlapping with the first and second electrodes along a column direction perpendicular to the row direction.