Position detection method, position detection apparatus, antenna apparatus, and display apparatus

摘要

Provided are a position detection method that selects one antenna at a time from a plurality of loop antennas, transmits, through the selected loop antenna, an electromagnetic signal to a pointer that indicates a screen unit, receives, from the pointer, a resonance signal corresponding to the electromagnetic signal transmitted through the selected loop antenna, and extracts polar coordinates including a distance value and an angle value of a point on a screen unit indicated by the pointer, based on a distribution of a signal strength of a resonance signal received through each of the plurality of loop antennas, a position detection apparatus, a display apparatus, and an antenna apparatus appropriate for extracting polar coordinates.

主权项

1. A position detection apparatus, comprising:
a polar coordinate antenna unit including a plurality of first loop antennas of different radii and a plurality of second loop antennas of different angle ranges; a switching unit configured to select one loop antenna at a time from the plurality of first loop antennas, and to select one loop antenna at a time from the plurality of second loop antennas; a transmitting unit configured to transmit an electromagnetic signal through the selected first loop antenna, and to transmit an electromagnetic signal through the selected second loop antenna; a receiving unit configured to receive, from a pointer, a resonance signal corresponding to the electromagnetic signal transmitted through the selected first loop antenna, and to receive, from the pointer, a resonance signal corresponding to the electromagnetic signal transmitted through the selected second loop antenna; and a processor configured to recognize a distribution of a signal strength of each of the plurality of first loop antennas based on the resonance signal received for each of the plurality of first loop antennas, and to recognize a distribution of a signal strength of each of the plurality of second loop antennas based on the resonance signal received for each of the plurality of second loop antennas, so as to extract polar coordinates including a distance value and an angle value of a point on a screen unit indicated by the pointer.