Method of outputting pen-up information based on detected position of active pen
A pointer position detection method performed by a sensor controller connected to a sensor pattern includes: detecting a pen signal transmitted via a pen electrode provided at a distal end of an active pen, detecting a position of the active pen based on a level of the pen signal detected; detecting one or more candidate touch positions of a passive pointer that does not transmit a signal by detecting one or more changes of one or more capacitances of the sensor pattern, and outputting, as the position of the passive pointer, the one or more candidate touch positions remaining after excluding the position of the active pen from the one or more candidate touch positions.
1. A sensor controller connected to a sensor pattern, the sensor controller comprising:
a processor; and
a memory storing at least one program that, when executed, causes the sensor controller to:
i) detect a pen signal transmitted via a pen electrode provided at a distal end of an active pen;
ii) detect a position of the active pen based on a level of the pen signal detected;
iii) determine a distance between a current position of the active pen detected by currently performing i) and ii), and a previous position of the active pen detected by previously performing i) and ii);
iv) when the distance exceeds a threshold value, output pen-up information indicative of the active pen separated from a touch surface and thereafter output the current position of the active pen; and
v) when the distance does not exceed the threshold value, without outputting the pen-up information, output the current position of the active pen.
2. The sensor controller according to claim 1 , wherein the at least one program, when executed, causes the sensor controller to:
when the level of the pen signal detected in i) equals or exceeds a first threshold, performing ii) detect the position of the active pen based on the level of the pen signal detected and, if the level of the pen signal detected is below a second threshold greater than the first threshold, not output the current position of the active pen.
3. The sensor controller according to claim 1 , wherein the at least one program, when executed, causes the sensor controller to:
vi) detect a position of a passive pointer by detecting a change in capacitance in the sensor pattern; and
vii) determine whether a type of the position of the passive pointer is a palm type or a finger type; and
when the type of the position of the passive pointer is determined to be the palm type, performing iii) detect the distance between the current position of the active pen and the previous position of the active pen.
4. The sensor controller according to claim 3 , wherein the at least one program, when executed, causes the sensor controller to:
when the level of the pen signal detected in i) equals or exceeds a first threshold, performing ii) detect the position of the active pen based on the level of the pen signal detected and, if the level of the pen signal detected is below a second threshold greater than the first threshold, not output the current position of the active pen.
5. The sensor controller according to claim 1 , wherein the at least one program, when executed, causes the sensor controller to:
iv) when the distance exceeds the threshold value, output the pen-up information, thereafter outputting pen-down information indicative of the active pen in contact with the touch surface, and thereafter outputting the current position of the active pen.
6. The sensor controller according to claim 5 , wherein the at least one program, when executed, causes the sensor controller to:
when the level of the pen signal detected in i) equals or exceeds a first threshold, performing ii) detect the position of the active pen based on the level of the pen signal detected and, if the level of the pen signal detected is below a second threshold greater than the first threshold, not output the current position of the active pen.
7. The sensor controller according to claim 1 , wherein the at least one program, when executed, causes the sensor controller to:
iv) when the distance exceeds the threshold value, output the pen-up information, thereafter output pen-down information indicative of the active pen in contact with the touch surface, and thereafter output the current position of the active pen.
8. The sensor controller according to claim 7 , wherein the at least one program, when executed, causes the sensor controller to:
vi) detect a position of a passive pointer by detecting a change in capacitance in the sensor pattern; and
vii) determine whether a type of the position of the passive pointer is a palm type or a finger type; and
when the type of the position of the passive pointer is determined to be the palm type, performing iii) determine the distance between the current position of the active pen and the previous position of the active pen.
9. The sensor controller according to claim 8 , wherein the at least one program, when executed, causes the sensor controller to:
when the level of the pen signal detected in i) equals or exceeds a first threshold, performing ii) detect the position of the active pen based on the level of the pen signal detected and, if the level of the pen signal detected is below a second threshold greater than the first threshold, not output the current position of the active pen.