Touch pressure sensitivity correction method and computer-readable recording medium

• US 10,394,364 B2
• Filed: 05/26/2016
• Issued: 08/27/2019
• Est. Priority Date: 07/24/2015
• Status: Active Grant

• Current Assignee: HiDeep Inc.
• Original Assignee: HiDeep Inc.
• Inventors: Seo, Bong Jin, Moon, Ho Jun, Jin, Myung Jun, Lee, Hwan Hee, Kim, Tae Hoon, Kim, Se Yeob, Lee, Won Woo, Yoon, Sang Sic, Kim, Bon Kee
• Primary Examiner(s): Pervan, Michael
• Application Number:
  US15/745,752
• Publication Number:
  US 20180210599A1
• Time in Patent Office: 1,188 Days
• Field of Search: 178 1801- 1907, 345173-178
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• 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

A touch pressure sensitivity correction method may be provided that includes: defining a plurality of reference points on a touch sensor panel; generating a reference data for a capacitance change amount sensed by applying the same pressure to the plurality of reference points; generating an interpolated data corresponding to a capacitance change amount for a random point present between the plurality of reference points; calculating, on the basis of the reference data and interpolated data, with respect to the reference points and the random point respectively, a correction factor for correcting a sensitivity of a touch input device to a target value; and correcting uniformly for the touch pressure sensitivity of the touch input device by applying the calculated correction factor to each corresponding point.

Claims

1. A touch pressure sensitivity correction method comprising:

defining a plurality of reference points on a touch sensor panel;

generating a reference data for an electrical characteristic change amount sensed by applying the same pressure to the plurality of reference points;

generating an interpolated data corresponding to an electrical characteristic change amount for a random point located between the plurality of reference points;

calculating, on the basis of the reference data and the interpolated data, for each of the reference points and the random point, a correction factor for correcting a touch pressure sensitivity of a touch input device to a target value; and

uniformly correcting the touch pressure sensitivity of the touch input device by applying the calculated correction factor to each corresponding point;

wherein the generating an interpolated data comprises;

creating a base profile on the basis of two or more profiles of the electrical characteristic change amount;

generating a delta data by calculating a deviation between an electrical characteristic change amount of the base profile and an electrical characteristic change amount of the reference data, with respect to coordinates of the plurality of reference points; and

calculating the electrical characteristic change amount for the random point on the basis of the delta data.

2. The touch pressure sensitivity correction method of claim 1, wherein, in the generating an interpolated data, the interpolated data corresponding to the electrical characteristic change amount for the random point is generated based on the reference data and a spaced distance from the plurality of reference points.

3. The touch pressure sensitivity correction method of claim 2, wherein the correction factor corresponds to a value obtained by dividing the target value by the electrical characteristic change amount recorded in the reference data and in the interpolated data and is calculated for each of the reference points and the random point.

4. The touch pressure sensitivity correction method of claim 2, wherein, in the defining the reference point, the reference point is located at an intersection of n number of horizontal lines parallel to each other and m number of vertical lines parallel to each other on the touch sensor panel, so that n×

m (n and m are natural numbers equal to or greater than

     2) number of the reference points are defined.

5. The touch pressure sensitivity correction method of claim 1, wherein the profile is a data recording the electrical characteristic change amount detected by applying the same pressure to a plurality of coordinates, with respect to a plurality of the touch input devices manufactured in the same process.

6. The touch pressure sensitivity correction method of claim 1, wherein, in the generating an interpolated data, the interpolated is generated by calculating the electrical characteristic change amount for the random point, on the basis of the delta data and a spaced distance from the plurality of reference points.

7. The touch pressure sensitivity correction method of claim 1, wherein, in the generating an interpolated data, a function based on the delta data and coordinates of the plurality of reference points is generated, and a coordinate of the random point is substituted into the function, so that the interpolated data corresponding to the electrical characteristic change amount for the random point is calculated.

8. A non-transitory computer-readable storage medium encoded with instructions which, when executed on a processor, perform the method of claim 1.

9. A touch pressure sensitivity correction method comprising:

defining a plurality of reference points on a touch sensor panel;

generating a reference data for an electrical characteristic change amount sensed by applying the same pressure to the plurality of reference points;

generating an interpolated data corresponding to an electrical characteristic change amount for a random point located between the plurality of reference points;

calculating, on the basis of the reference data and the interpolated data, for each of the reference points and the random point, a correction factor for correcting a touch pressure sensitivity of a touch input device to a target value; and

uniformly correcting the touch pressure sensitivity of the touch input device by applying the calculated correction factor to each corresponding point,

wherein, in the generating an interpolated data, a function based on the reference data and coordinates of the plurality of reference points is generated, and a coordinate of the random point is substituted into the function, so that the interpolated data corresponding to the capacitance change amount for the random point is calculated,

wherein the correction factor corresponds to a value obtained by dividing the target value by the electrical characteristic change amount recorded in the reference data and in the interpolated data and is calculated for each of the reference points and the random point.

10. A non-transitory computer-readable storage medium encoded with instructions which, when executed on a processor, perform the method of claim 9.

11. A touch pressure sensitivity correction method comprising:

defining a plurality of reference points on a touch sensor panel;

generating a reference data for an electrical characteristic change amount sensed by applying the same pressure to the plurality of reference points;

generating an interpolated data corresponding to an electrical characteristic change amount for a random point located between the plurality of reference points;

calculating, on the basis of the reference data and the interpolated data, for each of the reference points and the random point, a correction factor for correcting a touch pressure sensitivity of a touch input device to a target value; and

uniformly correcting the touch pressure sensitivity of the touch input device by applying the calculated correction factor to each corresponding point,

wherein, in the generating an interpolated data, a function based on the reference data and coordinates of the plurality of reference points is generated, and a coordinate of the random point is substituted into the function, so that the interpolated data corresponding to the capacitance change amount for the random point is calculated,

wherein, in the defining the reference point, the reference point is located at an intersection of n number of horizontal lines parallel to each other and m number of vertical lines parallel to each other on the touch sensor panel, so that n×

m (n and m are natural numbers equal to or greater than

     2) number of the reference points are defined.

12. A non-transitory computer-readable storage medium encoded with instructions which, when executed on a processor, perform the method of claim 11.