Method for correcting sensitivity of touch input device that detects touch pressure and computer-readable recording medium

• US 10,331,256 B2
• Filed: 05/25/2016
• Issued: 06/25/2019
• Est. Priority Date: 05/29/2015
• Status: Active Grant

• Current Assignee: HiDeep Inc.
• Original Assignee: HiDeep Inc.
• Inventors: Moon, Ho Jun, Kim, Bon Kee, Kim, Se Yeob, Seo, Bong Jin, Kim, Tae Hoon, Jin, Myung Jun
• Primary Examiner(s): Lin, Hang
• Application Number:
  US15/562,603
• Publication Number:
  US 20180088721A1
• Time in Patent Office: 1,126 Days
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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
• 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
• 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 sensitivity compensation method of a touch input device sensing a touch pressure may be provided. The sensitivity compensation method includes: defining a plurality of reference points spaced apart from each other on a touch sensor panel; generating a reference data corresponding to a capacitance change amount sensed by applying a predetermined pressure to the plurality of reference points; generating, on the basis of the reference data, 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 generated reference data and interpolated data, with respect to the reference point and random point respectively, a compensation factor for compensating a sensitivity of the touch input device to a target value; and compensating uniformly for the sensitivity of the touch input device by applying the calculated compensation factor to each corresponding points.

Claims

1. A sensitivity compensation method of a touch input device sensing a touch pressure, the sensitivity compensation method comprising:

defining a plurality of reference points spaced apart from each other on a touch sensor panel;

generating a reference data corresponding to a capacitance change amount sensed by applying a predetermined pressure to the plurality of reference points;

generating, on the basis of the reference data, 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 generated reference data and interpolated data, with respect to the reference point and random point respectively, a compensation factor for compensating a sensitivity of the touch input device to a target value; and

compensating uniformly for the sensitivity of the touch input device by applying the calculated compensation factor to each corresponding points.

2. The sensitivity compensation method of claim 1, wherein the compensation factor corresponds to a value obtained by dividing the target value by the capacitance change amount recorded in the reference data and in the interpolated data and is calculated for the reference point and the random point respectively.

3. The sensitivity compensation method of claim 1, 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.

4. The sensitivity compensation method of claim 1, wherein the interpolated data is generated based on the capacitance change amount detected at four reference points surrounding the random point and on a spaced distance between the random point and four reference points.

5. The sensitivity compensation method of claim 1, comprising

defining, before defining the reference point, a plurality of position points on the touch sensor panel comprised in a plurality of the touch input devices;

sensing the capacitance change amount by applying the same pressure to the plurality of position points;

generating an average value data by calculating an average value of the capacitance change amount sensed at the same position between the plurality of touch input devices;

calculating, on the basis of the average value data, a first compensation factor at the plurality of position points; and

compensating uniformly the sensitivity of the touch input device by applying the first compensation factor to the plurality of position points.

6. The sensitivity compensation method of claim 5, wherein the first compensation factor corresponds to an inverse number of the average value.

7. The sensitivity compensation method of claim 5, wherein the plurality of position points are defined at the same position as those of the reference point and the random point.

8. A non-transitory computer-readable recording medium recording a program which performs:

defining a plurality of reference points spaced apart from each other on a touch sensor panel;

generating a reference data corresponding to a capacitance change amount sensed by applying a predetermined pressure to the plurality of reference points;

generating, on the basis of the reference data, 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 generated reference data and interpolated data, with respect to the reference point and random point respectively, a compensation factor for compensating a sensitivity of the touch input device to a target value; and

compensating uniformly for the sensitivity of the touch input device by applying the calculated compensation factor to each corresponding points.

9. The non-transitory computer-readable recording medium of claim 8, wherein the program recorded in the computer-readable recording medium further performs:

defining, before defining the reference point, a plurality of position points on the touch sensor panel comprised in a plurality of the touch input devices;

sensing the capacitance change amount by applying the same pressure to the plurality of position points;

generating an average value data by calculating an average value of the capacitance change amount sensed at the same position between the plurality of touch input devices;

calculating, on the basis of the average value data, a first compensation factor at the plurality of position points; and

compensating uniformly the sensitivity of the touch input device by applying the first compensation factor to the plurality of position points.