CAPACITIVE TOUCH PANEL HAVING IMPROVED RESPONSE CHARACTERISTICS

• US 20140022199A1
• Filed: 07/19/2012
• Published: 01/23/2014
• Est. Priority Date: 07/19/2012
• Status: Abandoned Application

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Peng, Tao, Moyal, Nathan Y., Ai, Jackson
• Application Number:
  US13/553,644
• Publication Number:
  US 20140022199A1
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 3/0443 using a single layer of sensing electrodes
• 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
• 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

Abstract

An apparatus is provided. A substrate and a cover plate are provided. A sensor layer is formed on at least one of the substrate and the cover plate. The sensor layer includes a plurality of row electrodes and a plurality of column electrodes interleaved with the plurality of row electrodes, where each row electrode and each column electrode is formed of a plurality of stair-stepped diamonds. An insulator is also included so as to electrically isolate the plurality of row electrodes and the plurality of column electrodes, where the insulator is substantially transparent to visible spectrum light. A bridge layer is also formed over the sensor layer and having a plurality of bridges, where each bridge is coupled between two adjacent stair-stepped diamonds from at least one of the column electrodes or the row electrodes.

Claims

1. An apparatus comprising:

a substrate;

a cover plate that is substantially transparent to visible spectrum light;

a sensor layer formed on at least one of the substrates and the cover plate, wherein the sensor layer includes;

a plurality of row electrodes;

a plurality of column electrodes interleaved with the plurality of row electrodes, wherein each row electrode and each column electrode is formed of a plurality of stair-stepped diamonds; and

an insulator that electrically isolates the plurality of row electrodes and the plurality of column electrodes, wherein the insulator is substantially transparent to visible spectrum light; and

a bridge layer formed over the sensor layer and having a plurality of bridges, wherein each bridge is coupled between two adjacent stair-stepped diamonds from at least one of the column electrodes or the row electrodes.

2. The apparatus of claim 1, wherein the conductive layer is formed on the cover plate.

3. The apparatus of claim 1, wherein the conductive layer is formed on the substrate.

4. The apparatus of claim 3, wherein the plurality of bridges further comprises a plurality of set of bridges, wherein each set of bridges is associated with at least one of the column electrodes.

5. The apparatus of claim 3, wherein the plurality of bridges further comprises a plurality of set of bridges, wherein each set of bridges is associated with at least one of the row electrodes.

6. The apparatus of claim 5, wherein each stair-stepped diamond is formed of a conductive trace.

7. The apparatus of claim 6, wherein each bridge and each conductive trace is substantially transparent to visible spectrum light.

8. The apparatus of claim 7, wherein the sensor layer further comprises a plurality of floating regions, wherein each floating region is substantially transparent to visible spectrum light, and wherein each floating region is located within at least one of the stair-stepped diamonds.

9. The apparatus of claim 3, wherein each bridge is substantially transparent to visible spectrum light, and wherein each stair-stepped diamond is formed of a conductive pad.

10. An apparatus comprising:

a touch panel having;

a substrate;

a cover plate that is substantially transparent to visible spectrum light;

a sensor layer formed on at least one of the substrates and the cover plate, wherein the sensor layer includes;

a plurality of row electrodes;

a plurality of column electrodes interleaved with the plurality of row electrodes, wherein each row electrode and each column electrode is formed of a plurality of stair-stepped diamonds; and

an insulator that electrically isolates the plurality of row electrodes and the plurality of column electrodes, wherein the insulator is substantially transparent to visible spectrum light; and

a bridge layer formed over the sensor layer and having a plurality of bridges, wherein each bridge is coupled between two adjacent stair-stepped diamonds from at least one of the column electrodes or the row electrodes;

an interconnect that is coupled to each row electrode and each column electrode; and

a touch panel controller that is coupled to the interconnect.

11. The apparatus of claim 10, wherein the conductive layer is formed on the cover plate.

12. The apparatus of claim 10, wherein the conductive layer is formed on the substrate.

13. The apparatus of claim 12, wherein the plurality of bridges further comprises a plurality of set of bridges, wherein each set of bridges is associated with at least one of the column electrodes.

14. The apparatus of claim 12, wherein the plurality of bridges further comprises a plurality of set of bridges, wherein each set of bridges is associated with at least one of the row electrodes.

15. The apparatus of claim 14, wherein each stair-stepped diamond is formed of a conductive trace.

16. The apparatus of claim 15, wherein each bridge and each conductive trace is substantially transparent to visible spectrum light.

17. The apparatus of claim 16, wherein the sensor layer further comprises a plurality of floating regions, wherein each floating region is substantially transparent to visible spectrum light, and wherein each floating region is located within at least one of the stair-stepped diamonds.

18. The apparatus of claim 12, wherein each bridge is substantially transparent to visible spectrum light, and wherein each stair-stepped diamond is formed of a conductive pad.

19. An apparatus comprising:

a touch panel having;

a display;

a substrate that is secured to the display, wherein the substrate is substantially transparent to visible spectrum light;

a sensor layer formed over the substrate, wherein the sensor layer includes;

a plurality of row electrodes formed over the substrate, wherein each row electrode is formed of a first set of stair-stepped diamonds;

a plurality of column electrodes formed over the substrate, wherein each column electrode is formed of a second set of stair-stepped diamonds that are coupled together; and

an first insulator that is formed over the substrate, wherein the first insulator is substantially transparent to visible spectrum light, and wherein the first insulator electrically isolates the plurality of row electrodes and the plurality of column electrodes;

a bridge layer formed over the sensor layer, wherein the bridge layer includes;

a plurality of sets of bridge conductors, wherein each set of bridge conductors is associated with at least one of the row electrodes so as to couple each stair-stepped diamond in each row electrode together; and

a second insulator formed over the sensor layer, wherein the second insulator is substantially transparent to visible spectrum light;

a cover plate that is secured to the bridge layer, wherein the cover plate is substantially transparent to visible spectrum light;

an interconnect that is coupled to each column electrode and each row electrode; and

a touch panel controller having;

an interface that is coupled to the interconnect; and

a control circuit that is coupled to the interface.

20. The apparatus of claim 19, wherein each stair-stepped diamond is formed of a conductive trace.

21. The apparatus of claim 20, wherein the sensor layer further comprises a plurality of floating regions, wherein each floating region is located within at least one of the stair-stepped diamonds.

22. The apparatus of claim 19, wherein each stair-stepped diamond is formed of a conductive pad that is substantially transparent to visible spectrum light.

23. The apparatus of claim 22, wherein the plurality of row electrodes, the plurality of column electrodes, and the plurality of bridge conductors are formed of indium tin oxide (ITO).