Capacitive touch device and capacitive communication device

• US 10,430,005 B2
• Filed: 02/09/2018
• Issued: 10/01/2019
• Est. Priority Date: 12/10/2014
• Status: Active Grant

• Current Assignee: PixArt Imaging Incorporated
• Original Assignee: PixArt Imaging Incorporated
• Inventors: Wu, Sung-Han, Chen, Yu-Han, Tsai, Ming-Hung, Yu, Meng-Lin, Chen, Hsin-Chia
• Primary Examiner(s): Cheng, Joe H
• Application Number:
  US15/893,114
• Publication Number:
  US 20180164924A1
• Time in Patent Office: 599 Days
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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

Abstract

There is provided a capacitive touch device including a touch panel, a detection circuit and a processing unit. The touch panel includes a plurality of drive electrodes and a plurality of receiving electrodes configured to form a coupling electric field with an external touch panel, and the receiving electrodes are respectively configured to output a detection signal. The detection circuit is coupled to one of the receiving electrodes and configured to modulate the detection signal with two signals to generate two detection components. The processing unit is configured to obtain a phase value according to the two detection components to accordingly decode transmission data.

Claims

1. A capacitive touch device, configured to perform a near field communication with at least one external induction conductor disposed on an external object, the capacitive touch device comprising:

a touch panel comprising at least one sensing electrode configured to form a coupling electric field with the at least one external induction conductor, wherein the at least one sensing electrode is configured to output a detection signal according to the coupling electric field;

a detection circuit, coupled to the at least one sensing electrode, configured to modulate the detection signal respectively with two signals to generate two detection components; and

a processing unit configured to obtain a norm of vector according to the two detection components to accordingly identify a touch event, and obtain transmission data according to the two detection components by at least one of an amplitude demodulation, a phase demodulation and a frequency demodulation.

2. The capacitive touch device as claimed in claim 1, wherein the at least one external induction conductor is disposed on an electronic lock, a mouse device, an earphone, a watch, a bracelet, a smart pen or a doll.

3. The capacitive touch device as claimed in claim 1, wherein the at least one external induction conductor is configured to receive a drive signal modulated by at least one of amplitude, frequency and phase modulations.

4. The capacitive touch device as claimed in claim 1, wherein the processing unit is configured to calculate the norm of vector and decode the transmission data according to an identical pair of the two detection components.

5. The capacitive touch device as claimed in claim 1, wherein the processing unit is configured to alternatively calculate the norm of vector and decode the transmission data according to different pairs of the two detection components.

6. The capacitive touch device as claimed in claim 1, wherein the processing unit is configured to decode the transmission data but stop identifying the touch event when identifying that a correlation between a plurality of transmission data and a predetermined code sequence exceeds a threshold.

7. The capacitive touch device as claimed in claim 6, wherein the predetermined code sequence includes Barker codes.

8. The capacitive touch device as claimed in claim 1, wherein the processing unit is configured to decode the transmission data but stop identifying the touch event when identifying that a plurality of transmission data match a predetermined code sequence.

9. A capacitive communication device, configured to perform a near field communication with at least one external induction conductor disposed on an external object, the capacitive communication device comprising:

at least one receiving electrode, configured as a receiving antenna and configured to form a coupling electric field with the at least one external induction conductor, wherein the receiving electrode is configured to output a detection signal according to the coupling electric field;

a detection circuit, coupled to the at least one receiving electrode, configured to modulate the detection signal with at least one signal to generate at least one detection component; and

a processing unit configured to obtain a phase value according to the at least one detection component to accordingly decode transmission data.

10. The capacitive communication device as claimed in claim 9, wherein the processing unit is further configured to perform a synchronization process in which the processing unit is configured to compare a plurality of transmission data with a predetermined code sequence.

11. The capacitive communication device as claimed in claim 10, wherein the predetermined code sequence includes Barker codes.

12. The capacitive communication device as claimed in claim 9, wherein the at least one external induction conductor is disposed on an electronic lock, a mouse device, an earphone, a watch, a bracelet, a smart pen or a doll.

13. A capacitive touch device, configured to perform object recognition according to a near field communication between the capacitive touch device and at least one external induction conductor disposed on an external object, the capacitive touch device comprising:

a touch panel comprising at least one sensing electrode configured to form a coupling electric field with the at least one external induction conductor, wherein the at least one sensing electrode is configured to output a detection signal according to the coupling electric field;

a detection circuit, coupled to the at least one sensing electrode, configured to modulate the detection signal respectively with two signals to generate two detection components; and

a processing unit configured to obtain a norm of vector according to the two detection components to accordingly identify a touch event, and perform the object recognition according to transmission data which is sent by the near field communication and obtained according to the two detection components by at least one of an amplitude demodulation, a phase demodulation and a frequency demodulation.

14. The capacitive touch device as claimed in claim 13, wherein the external object is an electronic lock, a mouse device, an earphone, a watch, a bracelet, a smart pen or a doll.

15. The capacitive touch device as claimed in claim 13, wherein the at least one external induction conductor is configured to receive a drive signal modulated by at least one of amplitude, frequency and phase modulations.

16. The capacitive touch device as claimed in claim 13, wherein the processing unit is configured to calculate the norm of vector and decode the transmission data according to an identical pair of the two detection components.

17. The capacitive touch device as claimed in claim 13, wherein the processing unit is configured to alternatively calculate the norm of vector and decode the transmission data according to different pairs of the two detection components.

18. The capacitive touch device as claimed in claim 13, wherein the processing unit is configured to decode the transmission data but stop identifying the touch event when identifying that a correlation between a plurality of transmission data and a predetermined code sequence exceeds a threshold.

19. The capacitive touch device as claimed in claim 18, wherein the predetermined code sequence includes Barker codes.

20. The capacitive touch device as claimed in claim 13, wherein the processing unit is configured to decode the transmission data but stop identifying the touch event when identifying that a plurality of transmission data match a predetermined code sequence.