Position detecting device and display device
AssigneeWacom Co., Ltd.
InventorSadao Yamamoto
Life of this patent
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Abstract
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.
Claims12
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.
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 driving coil comprises a single driving coil wound spirally along the rear side of the display, said driving coil crossing back and forth along the rear side of the display several times.
A display device, comprising:
- a display panel having a front display-surface side and a rear-surface side opposite the front display-surface side;
- a position detecting device operably associated with said display panel, said position detecting device including
- a position indicator for transmitting position-indicating signals;
- a position detector provided on said front display-surface side of said display panel, said position detector comprising a plurality of first conductive elements that comprise a transparent conductive member extending across the display to detect said position-indicating signals transmitted from said position indicator, the first conducive elements having a first resistance;
- and
- a driving coil provided below said rear-surface side of said display panel 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 driving coil comprises a single driving coil wound spirally along said rear surface side of said display panel, said driving coil crossing back and forth along said rear surface side several times.
Dependencies are inferred from the claim text.