Method for preventing interference of contactless card reader and touch functions when they are physically and logically bound together for improved authentication security

Patent metadata

Field	Value
Publication number	US-9740342-B2
Application number	US-201213720075-A
Country	US
Kind code	B2
Filing date	Dec 19, 2012
Priority date	Dec 23, 2011
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A system for physically and logically integrating near field communication technology, touch sensor technology and display technology by using a more powerful near field communication antenna disposed under the touch sensor and display screen for transmitting, and a smaller near field communication antenna on top of the touch sensor for receiving near field communication signals.

First claim

What is claimed is:

1. A system that integrates a touch sensor and near field communication antenna technology to provide communications in a touch sensitive portable electronic appliance, said system comprising:
a display screen;
a touch sensor disposed on top of the display screen to thereby create a touchscreen;
a receiving near field communication antenna disposed between the display screen and the touch sensor and that may only function for receiving a signal; and
a transmitting near field communication antenna disposed underneath the display screen and that may only function for transmitting a signal through the touchscreen, wherein the receiving near field communication antenna is smaller than the transmitting near field communication antenna.

2. The system as defined in claim 1 wherein the system is further comprised of a ground plane disposed between the transmitting near field communication antenna and the touch sensor, wherein the ground plane includes a plurality of electrodes that are formed so that there are no closed loops to thereby minimize eddy currents in the electrodes.

3. The system as defined in claim 1 wherein the system is further comprised of a ground plane on a same substrate as the transmitting near field communication antenna, wherein the ground plane includes a plurality of electrodes that are formed so that there are no closed loops to thereby minimize eddy currents in the electrodes.

4. The system as defined in claim 1 wherein the system is further comprised of a ground plane disposed under the transmitting near field communication antenna, wherein the ground plane includes a plurality of electrodes that are formed so that there are no closed loops to thereby minimize eddy currents in the electrodes.

5. The system as defined in claim 1 wherein the system is further comprised of:
a low or a high impedance material being used for the receiving near field communication antenna; and
a low impedance material being used for the transmitting near field communication antenna.

6. The system as defined in claim 5 wherein the system is further comprised of an antenna circuit having a high input impedance input circuit for receiving an input signal from the receiving near field communication antenna, and a low output impedance driver circuit for transmitting a signal to the transmitting near field communication antenna.

7. The system as defined in claim 1 wherein the system is further comprised of disposing ferrite material on at least one substrate of the system to thereby compress electric or magnetic fields generated by the system.

8. The system as defined in claim 1 wherein the system is further comprised of at least one substrate disposed between the touch sensor and the transmitting NFC antenna, wherein a conductive material is disposed on a surface of the at least one substrate to thereby reduce electrical field interference of the transmitting NFC antenna with the touch sensor.

9. The system as defined in claim 8 wherein the system is further comprised of a conductive electrode that is coupled to all of the conductive material on the at least one substrate to thereby electrically couple all of the conductive material.

10. The system as defined in claim 8 wherein the system is further comprised of a filter disposed on each electrode of the touch sensor to thereby prevent interference of the transmitting NFC antenna with the touch sensor.

11. The system as defined in claim 10 wherein the system is further comprised of a capacitor disposed on each electrode of the touch sensor to thereby shunt signals from the transmitting NFC antenna to ground.

12. The system as defined in claim 1 wherein the system is further comprised of a common oscillator clocking signal that is used by the touch sensor, the display screen and the NFC antennas to thereby minimize unwanted signals between the touch sensor, the display screen and the NFC antennas.

13. The system as defined in claim 1 wherein the system is further comprised of a sensor for detecting activation of the transmitting NFC antenna, to thereby enable the touch sensor to modify sensing functions.

14. The system as defined in claim 1 wherein the system is further comprised of a sensor for detecting activation of the touch sensor, to thereby enable the transmitting NFC antenna to terminate communication functions.

15. The system as defined in claim 1 wherein the system is further comprised of a switch in the touch sensor that enables activation of the receiving NFC antenna, the transmitting NFC antenna, or a combination of the two.

16. The system as defined in claim 1 wherein the system is further comprised of a synchronization circuit for synchronizing functions of the touch sensor, the receiving near field communication antenna, the transmitting near field communication and the display screen.

17. The system as defined in claim 1 wherein the system is further comprised of a mutual capacitance touch sensor.

18. The system as defined in claim 1 wherein the system is further comprised of the display screen being selected from the group of display screens comprised of a liquid crystal display, a light emitting diode display, and an organic light emitting diode display.

19. The system as defined in claim 1 wherein the system is further comprised of a directional coupler connected to the receiving near field communication antenna if the receiving near field communication antenna is used to receive a signal.

20. A method for integrating a touch sensor and near field communication antenna technology to provide communications in a touch sensitive portable electronic appliance, said method comprising:
1) providing a display screen, a touch sensor disposed on top of the display screen to thereby create a touchscreen, a receiving near field communication antenna that may only receive signals and is disposed between the touch sensor and the display screen for receiving a signal, and a transmitting near field communication antenna that may only transmit signals and is disposed under or around the display screen for transmitting a signal, wherein the receiving antenna is smaller than the transmitting antenna; and
2) transmitting a near field communication signal from the transmitting near field communication antenna through the display screen, the touch sensor and the receiving near field communication antenna; and
3) receiving a near field communication signal on the receiving near field communication antenna.

21. The method as defined in claim 20 wherein the method is further comprised of:
1) disposing a ground plane between the transmitting near field communication antenna and the touch sensor; and
2) forming a plurality of ground plane electrodes so that there are no closed loops to thereby minimize eddy currents in the electrodes.

22. The method as defined in claim 20 wherein the method is further comprised of:
1) disposing a ground plane on a same substrate as the transmitting near field communication antenna; and
2) forming a plurality of ground plane electrodes so that there are no closed loops to thereby minimize eddy currents in the electrodes.

23. The method as defined in claim 20 wherein the system is further comprised of:
1) disposing a ground plane on a substrate under the transmitting near field communication antenna; and
2) forming a plurality of ground plane electrodes so that there are no closed loops to thereby minimize eddy currents in the electrodes a gro

Assignees

• Cirque Corp

Inventors

• Paulsen Keith L
• Paulsen Andrew

Classifications

• G06F3/044 Primary

  by capacitive means · CPC title

• H01Q21/28

  Combinations of substantially independent non-interacting antenna units or systems {(multiple beam H01Q25/00)} · CPC title

• H01Q1/22 Primary

  by structural association with other equipment or articles · CPC title

• H01Q1/48

  Earthing means; Earth screens; Counterpoises · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title