Coordinate detection method
A coordinate detection method includes detecting coordinates corresponding to a position of a pen tip electrode of a pen by detecting distribution of signal levels in a plane of a touch surface through use of a plurality of linear electrodes disposed in the plane of the touch surface; detecting tilt data indicating a tilt of the pen; and acquiring a correction amount corresponding to a combination of the coordinates and the tilt data by referencing a correction table defining a correspondence between correction amounts and combinations of coordinates and tilt data.
1. A coordinate detection method comprising:
detecting coordinates corresponding to a position of a pen tip electrode of a pen by detecting a distribution of signal levels in a plane of a touch surface through use of a plurality of linear electrodes disposed in the plane of the touch surface;
detecting tilt data indicating a tilt of the pen;
acquiring intermediate coordinates by correcting the coordinates corresponding to the position of the pen tip electrode of the pen according to the tilt data; and
acquiring a correction amount corresponding to the intermediate coordinates by referencing a correction table defining a correspondence between coordinates and correction amounts.
2. The coordinate detection method according to claim 1 ,
wherein the linear electrodes are arranged in parallel at predetermined intervals, and
the correction table defines a one-dimensional correspondence between correction amounts and relative coordinates from coordinates determined based on the predetermined intervals.
3. The coordinate detection method according to claim 2 , wherein the correction table includes relative coordinates of areas corresponding to the predetermined intervals.
4. The coordinate detection method according to claim 1 , further comprising:
obtaining second intermediate coordinates by correcting the coordinates corresponding to the position of the pen tip electrode of the pen using the correction amount; and
acquiring output coordinates by correcting the second intermediate coordinates according to the tilt data.
5. The coordinate detection method according to claim 4 , wherein the correcting the second intermediate coordinates according to the tilt data includes making a parallax correction.