Position detecting device and display device

摘要

A position detecting device usable with a display having a display-surface side and a rear-surface side opposite to the front side is provided. The position detecting device includes a position indicator, a detector, and a driving coil. The detector is provided on the display-surface side of the display and is configured to detect signals transmitted from the position indicator. The driving coil is provided on the rear-surface side of the display and is configured to supply electric current to the position indicator.

主权项

1. A position detecting device usable with a display having a front side and a rear side opposite to the front side, said position detecting device comprising:
a position indicator for transmitting position-indicating signals; a position detector for disposing on the front side of the display, said position detector comprising a plurality of first conductive elements that comprise a transparent conductive member for extending across the display to detect said position-indicating signals transmitted from said position indicator, the first conductive elements having a first resistance; and a driving coil for disposing below the rear side of the display and comprising a second conductive element having a second resistance which is lower than said first resistance of said first conductive element so as to transmit a position-indicator driving signal to said position indicator and thereby induce a current in said position indicator; and wherein said position indicator comprises a resonant circuit for electromagnetic interaction with said driving coil to induce the current in said position indicator; and wherein said position detector comprises a plurality of detection coils forming a grid for extending across the display, and wherein said driving coil is operable to transmit a first signal to said position indicator to induce a current in said resonant circuit thereof, and said resonant circuit is operable to transmit a second signal to said detection coils for position detection; and wherein said driving coil is driven constantly so that said first signal and said second signal are transmitted simultaneously.