HYBRID CAPACITIVE IMAGE DETERMINATION AND USE

• US 20150015528A1
• Filed: 09/30/2013
• Published: 01/15/2015
• Est. Priority Date: 07/10/2013
• Status: Abandoned Application

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Incorporated
• Inventors: Vandermeijden, Tom
• Application Number:
  US14/041,531
• Publication Number:
  US 20150015528A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• 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

In a method of determining a hybrid capacitive image a transcapacitive image, a first absolute capacitive profile, and a second absolute capacitive profile are acquired with a plurality of sensor electrodes. An absolute capacitive image is determined as a function of the first absolute capacitive profile and the second absolute capacitive profile. A hybrid capacitive image is determined as a function of the absolute capacitive image and the transcapacitive image.

Claims

1. A method of determining a hybrid capacitive image comprising:

acquiring a transcapacitive image, a first absolute capacitive profile, and a second absolute capacitive profile with a plurality of sensor electrodes;

determining an absolute capacitive image as a function of said first absolute capacitive profile and said second absolute capacitive profile; and

determining a hybrid capacitive image as a function of said absolute capacitive image and said transcapacitive image.

2. The method as recited in claim 1, further comprising:

downwardly adjusting originally determined capacitive pixel values of said hybrid capacitive image through use of a root function.

3. The method as recited in claim 1, wherein said determining an absolute capacitive image as a function of said first absolute capacitive profile and said second absolute capacitive profile comprises:

weighting at least a portion of one of said first absolute capacitive profile and said second absolute capacitive profile.

4. The method as recited in claim 1, wherein said determining said absolute capacitive image as a function of said first absolute capacitive profile and said second absolute capacitive profile comprises:

multiplying said first absolute capacitive profile and said second absolute capacitive profile.

5. The method as recited in claim 1, wherein said determining said absolute capacitive image as a function of said first absolute capacitive profile and said second absolute capacitive profile comprises:

determining a linear combination of said first absolute capacitive profile and said second absolute capacitive profile.

6. The method as recited in claim 1, wherein said determining a hybrid capacitive image as a function of said absolute capacitive image and said transcapacitive image comprises:

weighting at least a portion of one of said absolute capacitive image and said transcapacitive image.

7. The method as recited in claim 1, wherein said determining a hybrid capacitive image as a function of said absolute capacitive image and said transcapacitive image comprises:

multiplying said absolute capacitive image and said transcapacitive image.

8. The method as recited in claim 1, wherein said determining a hybrid capacitive image as a function of said absolute capacitive image and said transcapacitive image comprises:

determining a linear combination of said absolute capacitive image and said transcapacitive image.

9. A processing system for a capacitive sensing input device, said processing system comprising:

a sensor module configured to acquire transcapacitive resulting signals by transmitting with a first one of a plurality of sensor electrodes and receiving with a second one of the plurality of sensor electrodes and acquire absolute capacitive resulting signals by modulating and receiving with the second one of the plurality of sensor electrodes; and

a determination module configured to;

determine a transcapacitive image from said transcapacitive resulting signals;

determine a first absolute capacitive profile and a second absolute capacitive profile from said absolute capacitive resulting signals;

determine an absolute capacitive image as a function of said first absolute capacitive profile and said second absolute capacitive profile; and

determine a hybrid capacitive image as a function of said absolute capacitive image and said transcapacitive image.

10. The processing system of claim 9, wherein said determination module is further configured to determine positional information for at least one input object based upon said hybrid capacitive image.

11. The processing system of claim 10, wherein said positional information for at least one input object comprises:

positional information for at least one gloved human digit.

12. The processing system of claim 9, wherein said determination module is further configured to perform an operation to downwardly adjust pixel values of said hybrid capacitive image.

13. The processing system of claim 9, wherein said determination module is further configured to:

weight at least a portion of one of said first absolute capacitive profile and said second absolute capacitive profile.

14. The processing system of claim 9, wherein said determination module is configured to:

multiply said first absolute capacitive profile and said second absolute capacitive profile to determine said absolute capacitive image.

15. The processing system of claim 9, wherein said determination module is configured to:

determine a linear combination of said first absolute capacitive profile and said second absolute capacitive profile to determine said absolute capacitive image.

16. The processing system of claim 9, wherein said determination module is configured to:

weight at least a portion of one of said absolute capacitive image and said transcapacitive image.

17. The processing system of claim 9, wherein said determination module is configured to:

multiply said absolute capacitive image and said transcapacitive image to determine said hybrid capacitive image.

18. The processing system of claim 9, wherein said determination module is configured to:

determine said hybrid capacitive image as a linear combination of said absolute capacitive image and said transcapacitive image.

19. The processing system of claim 9, wherein said determination module is configured to:

scale said hybrid capacitive image.

20. A capacitive sensing input device, said capacitive sensing input device comprising:

a plurality of sensor electrodes; and

a processing system coupled with said plurality of sensor electrodes, said processing system configured to;

acquire transcapacitive resulting signals by transmitting with a first one of a plurality of sensor electrodes and receiving with a second one of the plurality of sensor electrodes;

acquire absolute capacitive resulting signals by modulating and receiving with the second one of the plurality of sensor electrodes;

determine a transcapacitive image from said transcapacitive resulting signals;

determine a first absolute capacitive profile and a second absolute capacitive profile from said absolute capacitive resulting signals;

determine an absolute capacitive image as a function of said first absolute capacitive profile and said second absolute capacitive profile; and

determine a hybrid capacitive image as a function of said absolute capacitive image and said transcapacitive image.

21. The capacitive sensing input device of claim 20, wherein said processing system is further configured to determine positional information for at least one input object based upon said hybrid capacitive image.

22. The capacitive sensing input device of claim 21, wherein said positional information for at least one input object comprises:

positional information for at least one gloved human digit.

23. The capacitive sensing input device of claim 20, wherein said processing system is further configured to perform an operation to downwardly adjust pixel values of said hybrid capacitive image.

24. The capacitive sensing input device of claim 20, wherein said hybrid capacitive image is constructed for a sub-portion of a sensing region of said capacitive sensing input device, wherein said sub-portion is less than the entirety of said sensing region.

25. The capacitive sensing input device of claim 24, wherein said sub-portion is selected based on said first absolute capacitive profile and said second absolute capacitive profile.

26. A processing system for a capacitive sensing input device, said processing system comprising:

a sensor module configured to acquire transcapacitive resulting signals by transmitting with a first one of a plurality of sensor electrodes and receiving with a second one of the plurality of sensor electrodes and acquire absolute capacitive resulting signals by modulating and receiving with the second one of the plurality of sensor electrodes; and

a determination module configured to;

determine a transcapacitive image from said transcapacitive resulting signals;

determine a first absolute capacitive profile and a second absolute capacitive profile from said absolute capacitive resulting signals; and

determine a hybrid capacitive image on a pixel-by-pixel basis as a function of said first absolute capacitive profile, said second absolute capacitive profile, and said transcapacitive image.

27. The processing system of claim 26, wherein said determination module is further configured to determine positional information for at least one input object based upon said hybrid capacitive image.

28. The processing system of claim 26, wherein said positional information for at least one input object comprises:

positional information for at least one gloved human digit.

29. The processing system of claim 26, wherein said determination module is further configured to perform an operation to downwardly adjust pixel values of said hybrid capacitive image.