Correction method of touch point and electromagnetic-type touch panel using the same

Patent metadata

Field	Value
Publication number	US-9423911-B2
Application number	US-201514620869-A
Country	US
Kind code	B2
Filing date	Feb 12, 2015
Priority date	Feb 12, 2014
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A touch point correction method is provided. Firstly, a first longitudinal base line of several longitudinal electrodes having a maximal energy is detected. Then, a right-side number of the longitudinal electrodes located in right side of the first longitudinal base line and sensing energy is detected. Then, a left-side number of the longitudinal electrodes located in left side of the longitudinal base line and sensing energy is detected. Then, a side corresponding to the largest of the right-side and left-side numbers is used as an inclined side, and a direction from the first longitudinal base line towards the inclined side is defined as an inclined direction. Then, a second longitudinal base line of the longitudinal electrodes having a sub-maximal energy is detected. Then, the sensing point is corrected by correction toward a reverse direction of the inclined direction according to ratio of the sub-maximal energy to the maximal energy.

First claim

What is claimed is:

1. A touch point correction method, comprising:
sensing a sensing point by an electromagnetic touch panel in response to a touch action, wherein the electromagnetic touch device comprises a plurality of longitudinal electrodes;
detecting a first longitudinal base line of the longitudinal electrodes having a first maximal energy;
detecting a right-side number of the longitudinal electrodes located in a right side of the first longitudinal base line and sensing energy;
detecting a left-side number of the longitudinal electrodes located in a left side of the first longitudinal base line and sensing energy;
using a side corresponding to the largest of the right-side number and the left-side number as a first inclined side, and defining a direction from the first longitudinal base line towards the first inclined side as a first inclined direction;
detecting a second longitudinal base line of the longitudinal electrodes located in first inclined side and having a first sub-maximal energy; and
correcting a position of the sensing point by a first correction towards a reverse direction of the first inclined direction according to a ratio of the first sub-maximal energy to the first maximal energy.

2. The touch point correction method according to claim 1 , wherein the touch action is a touch type touch action.

3. The touch point correction method according to claim 1 , wherein the touch action is a non-touch type touch action.

4. The touch point correction method according to claim 1 , wherein the touch action is generated by a stylus.

5. The touch point correction method according to claim 4 , wherein the first correction is a product of a correction base value and a correction weight, and the correction weight is proportional to an inclined angle of the stylus.

6. The touch point correction method according to claim 5 , wherein the correction base value is a pixel amount.

7. The touch point correction method according to claim 1 , wherein the electromagnetic touch device comprises a plurality of transverse electrodes, and the touch point correction method further comprises:
detecting a first transverse base line of the transverse electrodes having a second maximal energy;
detecting an upper-side number of the transverse electrodes located in an upper side of the first transverse base line and sensing energy;
detecting a lower-side number of the transverse electrodes located in a lower side of the first transverse base line and sensing energy;
using a side corresponding to the largest of the upper-side number and the lower-side number as a second inclined side, and defining a direction from the first transverse base line towards the second inclined side as a second inclined direction;
detecting a second transverse base line of the transverse electrodes located in second inclined side as a second sub-maximal energy; and
correcting the sensing point by a second correction towards a reverse direction of the second inclined direction according to a ratio of the second sub-maximal energy to the second maximal energy.

8. An electromagnetic touch panel, comprising:
a plurality of longitudinal electrodes used for sensing a sensing point in response to a touch action; and
a processing unit used for:
detecting a first longitudinal base line of the longitudinal electrodes having a first maximal energy;
detecting a right-side number of the longitudinal electrodes located in a right side of the first longitudinal base line and sensing energy;
detecting a left-side number of the longitudinal electrodes located in a left side of the first longitudinal base line and sensing energy;
using a side corresponding to the largest of the right-side number and left-side number as a first inclined side, and defining a direction from the first longitudinal base line and towards the first inclined side as a first inclined direction;
detecting a second longitudinal base line of the longitudinal electrodes located in first inclined side and having a first sub-maximal energy; and
correcting the position of the sensing point by a first correction towards a reverse direction of the first inclined direction according to a ratio of the first sub-maximal energy to the first maximal energy.

9. The electromagnetic touch panel according to claim 8 , wherein the touch action is a touch type touch action.

10. The electromagnetic touch panel according to claim 8 The electromagnetic touch panel, wherein the touch action is a non-touch type touch action.

11. The electromagnetic touch panel according to claim 8 , wherein the touch action is generated by a stylus.

12. The electromagnetic touch panel according to claim 11 , further comprising:
calculating a product of a correction base value and a correction weight and using the product value as the first correction, wherein the correction weight is proportional to inclined angle of the stylus.

13. The electromagnetic touch panel according to claim 12 , wherein the correction base value is a pixel amount.

14. The electromagnetic touch panel according to claim 8 , wherein the electromagnetic touch panel further comprises a plurality of transverse electrodes, and the processing unit is used for:
detecting a first transverse base line of the transverse electrodes having a second maximal energy;
detecting an upper-side number of the transverse electrodes located in an upper side of the first transverse base line and sensing energy;
detecting a lower-side number of the transverse electrodes located in a lower side of the first transverse base line and sensing energy;
using a side corresponding to the largest of the upper-side number and the lower-side number as a second inclined side, and defining a reverse direction of the first transverse base line towards the second inclined side as a second inclined direction;
detecting a second transverse base line of the transverse electrodes located in second inclined side and having a second sub-maximal energy; and
correcting the sensing point by a second correction towards a reverse direction of the second inclined direction according to a ratio of the second sub-maximal energy to the second maximal energy.

Assignees

• E Ink Holdings Inc

Inventors

• Kuo Wei-Kai

Classifications

• G06F3/03545

  Pens or stylus · CPC title

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/046

  by electromagnetic means · CPC title