Sensoring apparatus of proximity and contact, and display devices
A sensor apparatus for detecting contact or proximity of an object includes a calculation section for separating a plurality of points of the contact or the proximity that are generated simultaneously, and calculating individual sets of positional coordinates, and the calculation section includes an analysis section for determining, based on a spatial distribution of signal intensity obtained through detection, a condition for separating the spatial distribution of the signal intensity into a plurality of regions.
1. A sensor apparatus for detecting contact or proximity of an object, comprising:
a calculation section for separating a plurality of points of the contact or the proximity that are generated simultaneously, and calculating individual sets of positional coordinates,
wherein the calculation section comprises an analysis section for determining, based on a first signal intensity distribution on a flat touch sensor detected by a signal from the flat touch sensor, a first threshold for removing noise contents and offset contents from the first signal intensity distribution, and
wherein, after removing the noise contents and the offset contents from the first signal intensity distribution by using the first threshold so as to generate a second signal intensity distribution on the flat touch sensor, the analysis section is configured to determine a second threshold for separating the second signal intensity distribution into a plurality of regions, each of which regions has a peak in accordance with the second signal intensity distribution.
2. The sensor apparatus according to claim 1 , wherein the analysis section is configured to analyze structure of the signal intensity distribution obtained through the detection, to thereby determine the threshold for separating the signal intensity distribution into the plurality of regions based on the structure of the signal intensity distribution.
3. The sensor apparatus according to claim 2 , wherein the analysis section is configured to convert a two-dimensional distribution of the signal intensity into a plurality of one-dimensional distributions, and to analyze a result of the conversion, to thereby determine the threshold for separating the signal intensity distribution into the plurality of regions.
4. The sensor apparatus according to claim 3 , wherein the plurality of one-dimensional distributions comprise two one-dimensional distributions corresponding to axes of the two-dimensional distribution, respectively.
5. The sensor apparatus according to claim 3 , wherein the analysis section is configured to perform the conversion into the plurality of one-dimensional distributions by performing orthogonal projection of the original two-dimensional distribution with respect to one-dimensional axes for the conversion.
6. The sensor apparatus according to claim 3 , wherein the analysis section is configured to determine a threshold for obtaining a maximum number of intervals each of which includes peak existing in each of the plurality of one-dimensional distributions obtained through the conversion of the two-dimensional distribution, to thereby determine the threshold for separating the signal intensity distribution into the plurality of regions.
7. The sensor apparatus according to claim 2 , wherein the analysis section is configured to perform a process, after the threshold for separating the signal intensity distribution into the plurality of regions is obtained, to leave data greater than the threshold among a two-dimensional distribution of the signal intensity.
8. The sensor apparatus according to claim 1 , wherein the analysis section is configured to use a spatial frequency distribution of a detection signal system signal transfer function, to thereby determine the threshold for separating the signal intensity distribution into the plurality of regions.
9. The sensor apparatus according to claim 8 , wherein the analysis section is configured to obtain the spatial frequency distribution of the detection signal system signal transfer function based on a two-dimensional signal intensity distribution obtained by a capacitance detection section with respect to a reference input to the touch sensor.
10. The sensor apparatus according to claim 9 , wherein the analysis section is configured to convert the two-dimensional signal intensity distribution obtained by the capacitance detection section with respect to the reference input to the touch sensor into a spatial frequency distribution, to thereby obtain the spatial frequency distribution of the detection signal system signal transfer function.
11. The sensor apparatus according to claim 10 , wherein the analysis section is configured to convert a two-dimensional signal intensity distribution to be measured by the capacitance detection section into a spatial frequency distribution, and to perform deconvolution calculation using the spatial frequency distribution and the prestored spatial frequency distribution with respect to the reference input.