Position measuring apparatus, pen and position measuring method

A position measuring apparatus, the position measuring apparatus comprising:

• a plurality of electrodes;
• a driving circuit configured to apply a driving signal to a first electrode among the plurality of electrodes during a first period, wherein the first electrode among the plurality of electrodes transmits an electric field transmission signal to a pen through a capacitive coupling formed between the first electrode among the plurality of electrodes and a conductive pen tip of the pen;
• and
• a processor configured to at least:
• control to stop applying the driving signal such that the transmission of the electric field transmission signal from the plurality of electrodes is stopped, during a second period after the first period,
• determine a position of the pen based on a comparative size of a current output from the one or more electrodes that receive the electric field reception signal during the first period, and
• determine the position of the pen based on a strength of a current, which corresponds to a strength of an electric field reception signal, generated from one or more electrodes among the plurality of electrodes that receive the electric field reception signal from the pen through respective capacitive couplings formed between the one or more electrodes and the conductive pen tip of the pen during the second period,
• wherein the pen generates an electromagnetic reception signal comprising the electric field reception signal and a magnetic field reception signal by producing resonance based on the electric field transmission signal, and
• wherein the first period is not overlapping the second period.

A method for determining a position of a pen at a position measuring apparatus, the method comprising:

• transmitting, from the position measuring apparatus, an electric field transmission signal generated from a first electrode among a plurality of electrodes of the position measuring apparatus to the pen through a capacitive coupling formed between the first electrode among the plurality of electrodes and a conductive pen tip of the pen during a first period, by applying a driving signal to the first electrode among the plurality of electrodes during the first period;
• stopping transmitting the electric field transmission signal during a second period after the first period, wherein the driving signal is not applied to the first electrode among the plurality of electrodes during the second period;
• receiving, from the pen, an electric field reception signal corresponding to the electric field transmission signal at one or more electrodes among the plurality of electrodes of the position measuring apparatus through respective capacitive couplings formed between the one or more electrodes and the conductive pen tip during the second period;
• identifying a position of the pen based on a comparative size of a current output from the one or more electrodes that receive the electric field reception signal during the first period;
• and
• identifying the position of the pen based on a strength of the electric field reception signal which is received at the one or more electrodes during the second period,
• wherein the pen generates an electromagnetic reception signal comprising the electric field reception signal and a magnetic field reception signal by producing resonance based on the electric field transmission signal, and
• wherein the first period is not overlapping the second period.