Capacitance sensing device

• US 9,110,547 B1
• Filed: 01/15/2013
• Issued: 08/18/2015
• Est. Priority Date: 01/15/2013
• Status: Active Grant

• Current Assignee: AmZetta Technologies, LLC (American Megatrends International, LLC)
• Original Assignee: American Megatrends Incorporated
• Inventors: Sivertsen, Clas G.
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): MARTINEZ QUILES, IVELISSE
• Application Number:
  US13/741,669
• Time in Patent Office: 945 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Multiple reconfigurable hover sensing arrays are utilized to detect the location of an object with respect to a “hover” sensing panel. Multiple enable switches control the size and the shape of the multiple reconfigurable hover sensing arrays. A portion of one of the multiple reconfigurable hover sensing arrays may overlap with another reconfigurable sensing array to improve detection resolution. A scanning and sampling mechanism might also be utilized to assist with controlling the enable switches.

Claims

1. A capacitance sensing device including:

a capacitive touch panel;

a plurality of capacitive sensor electrodes; and

a microcontroller configured to

create values in sampled value map (SVM) by consecutively sampling signals generated by single ones of the capacitive sensor electrodes;

create values in the SVM by consecutively sampling signals generated by overlapping 2×

2 matrices of the capacitive sensor electrodes;

create values in the SVM by consecutively sampling signals generated by overlapping 3×

3 matrices of the capacitive sensor electrodes;

create values in the SVM by consecutively sampling signals generated by overlapping 4×

4 matrices of the capacitive sensor electrodes; and

create values in the SVM by sampling signals generated by each of the plurality of capacitive sensor electrodes.

2. The capacitive sensing device of claim 1, wherein the microcontroller is further configured to:

sample the signals generated by the capacitive sensor electrodes a plurality of times.

3. The capacitive sensing device of claim 2, wherein the microcontroller is further configured to record a median value of the sampled signals in the sampled value map (SVM).

4. The capacitance sensing device of claim 1, wherein the plurality of capacitive sensor electrodes is located on a first side of the capacitive touch panel, and wherein the microcontroller is located on a second side of the capacitive touch panel.

5. The capacitance sensing device of claim 4, wherein the microcontroller further comprises a capacitance engine for transmitting detection signals and sampling response signals of the detection signals.

6. A method of detecting a location of an object with respect to a capacitive touch panel, the method comprising:

providing multiple capacitive sensor electrodes in conjunction with the capacitive touch panel; and

configuring a microcontroller to;

create values in a sampled value map (SVM) by consecutively sampling signals generated by single ones of the capacitive sensor electrodes,

create values in the SVM by consecutively sampling signals generated by overlapping 2×

2 matrices of the capacitive sensor electrodes,

create values in the SVM by consecutively sampling signals generated by overlapping 3×

3 matrices of the capacitive sensor electrodes,

create values in the SVM by consecutively sampling signals generated by overlapping 4×

4 matrices of the capacitive sensor electrodes,

create values in the SVM by sampling signals generated by each of the plurality of capacitive sensor electrodes, and

detect the location of the object using the SVM.

7. The method of claim 6, wherein the microcontroller is further configured to:

sample signals generated by the capacitive sensing electrodes three times.

8. The method of claim 7, wherein the microcontroller is further configured to:

save a median value of the sampled signals in the sampled value map (SVM).