Touch panel and touch panel system
Proximity of a coil is recognized without increasing a material cost or a manufacturing cost. Provided is a touch panel ( 1 ) that includes a plurality of drive electrodes ( 4 ) that are formed in a drive layer ( 2 ) and a plurality of touch sense electrodes ( 5 ) that are formed in a sense layer ( 3 ), in which a proximity sense electrode ( 7 ) by which proximity of a coil is detected is formed in the sense layer ( 3 ).
1. A touch panel comprising:
a plurality of drive electrodes that are in a drive layer along a first direction; and
a plurality of touch sense electrodes that are in a sense layer, which is insulated from the drive layer, along a second direction crossing the plurality of drive electrodes, wherein a plurality of first proximity sense electrodes by each of which proximity of a coil is detected are provided in the sense layer to correspond to the plurality of touch sense electrodes, respectively,
the plurality of first proximity sense electrodes are each arranged to surround a corresponding one of the plurality of touch sense electrodes,
a second proximity sense electrode is arranged to surround the plurality of first proximity sense electrodes,
drive voltages are applied to the plurality of drive electrodes for a touch detection period in which a touch to the touch panel is detected, and linear sum signals which are based on the drive voltages applied to the drive electrodes and are originated from charges of a plurality of capacitors are read out along the plurality of touch sense electrodes, and
coil detection voltages are applied to the plurality of drive electrodes for a coil detection period in which the proximity of the coil is detected, and linear sum signals which are based on the coil detection voltages applied to the plurality of drive electrodes and are originated from charges of the plurality of capacitors, are read out along the plurality of touch sense electrodes when the linear sum signals are affected by a change of a coupled charge between each of the plurality of first proximity sense electrodes and corresponding one of the plurality of touch sense electrodes due to the proximity of the coil.
2. The touch panel according to claim 1 , wherein the coil is provided in an RFID apparatus.
3. The touch panel according to claim 1 , wherein the plurality of first proximity sense electrodes each have a resonance frequency of the coil.
4. The touch panel according to claim 1 , wherein the plurality of first proximity sense electrodes are made from ITO (Indium Tin Oxide).
5. The touch panel according to claim 1 , further comprising a plurality of resonance frequency capacitors that are each connected to one end and the other end of a corresponding one of the plurality of first proximity sense electrodes to define a resonance frequency of the each of the plurality of first proximity sense electrodes, wherein
each of the plurality of first proximity sense electrodes has a U-shape.
6. The touch panel according to claim 1 , further comprising a plurality of drive layer proximity sense electrodes that are in the drive layer to have a resonance frequency of the coil in order to detect the proximity of the coil, wherein
the plurality of drive layer proximity sense electrodes are arranged at positions corresponding to the respective plurality of drive electrodes.
7. The touch panel according to claim 1 , wherein
the touch panel is built in a liquid crystal display panel,
the liquid crystal display panel includes a circuit substrate, a facing substrate that is arranged opposing the circuit substrate, and a liquid crystal layer that is between the circuit substrate and the facing substrate, and
the drive layer and the sense layer are in the circuit substrate.
8. The touch panel according to claim 1 , wherein
the touch panel is built in a liquid crystal display panel,
the liquid crystal display panel includes a circuit substrate, a facing substrate that is arranged facing the circuit substrate, and a liquid crystal layer that is between the circuit substrate and the facing substrate,
the drive layer is in one of the circuit substrate and the facing substrate, and
the sense layer is in the other of the circuit substrate and the facing substrate.
9. The touch panel according to claim 1 , wherein
the touch panel is built in a liquid crystal display panel,
the liquid crystal display panel includes a circuit substrate, a facing substrate that is arranged facing the circuit substrate, and a liquid crystal layer that is between the circuit substrate and the facing substrate, and
the drive layer and the sense layer are in the facing substrate.
10. The touch panel according to claim 1 , wherein the coil is provided in a stylus pen by which information is input to the touch panel.
11. A touch panel system comprising:
the touch panel according to claim 1 ; and
a controller that controls the touch panel, wherein
the controller includes:
a drive circuit that applies drive voltages to the plurality of drive electrodes for a touch detection period in which a touch to the touch panel is detected and that applies coil detection voltages to the plurality of drive electrodes for a coil detection period in which the proximity of the coil is detected, and
a detection circuit that detects a touch position for the touch detection period by reading out, along the plurality of touch sense electrodes, linear sum signals which are based on the drive voltages applied to the plurality of drive electrodes and are originated from charges of a plurality of capacitors, and that detects the proximity of the coil for the coil detection period by reading out, along the plurality of touch sense electrodes, linear sum signals which are based on the coil detection voltages applied to the plurality of drive electrodes, are originated from charges of the plurality of capacitors, and are affected by a change of a coupled charge between each of the plurality of first proximity sense electrodes and a corresponding one of the plurality of touch sense electrodes due to the proximity of the coil, and
a frequency modulator that receives, from each of the first proximity sense electrodes, a signal based on a resonance frequency of the coil, modulates a frequency of the signal, and supplies the resultant to an RFID transmitter/receiver or the controller.
12. A touch panel comprising:
a plurality of drive electrodes that are in a drive layer along a first direction; and
a plurality of touch sense electrodes that are in a sense layer, which is insulated from the drive layer, along a second direction crossing the plurality of drive electrodes, wherein
a proximity sense electrode by which proximity of a coil is detected is provided in the sense layer,
drive voltages are applied to the plurality of drive electrodes for a touch detection period in which a touch to the touch panel is detected, and linear sum signals that are based on the drive voltages applied to the plurality of drive electrodes and are originated from charges of a plurality of capacitors are read out along the plurality of touch sense electrodes, and
coil detection voltages are applied to the plurality of drive electrodes for a coil detection period in which the proximity of the coil is detected, and linear sum signals that are based on the coil detection voltages applied to the plurality of drive electrodes and are originated from the charges of the plurality of capacitors, are read out along the plurality of touch sense electrodes when the linear sum signals are affected by a change of a coupled charge between the proximity sense electrode and a corresponding one of the plurality of touch sense electrodes due to the proximity of the coil.
13. The touch panel according to claim 12 , wherein the coil is provided in an RFID apparatus.
14. The touch panel according to claim 12 , wherein the proximity sense electrode has a resonance frequency of the coil.
15. The touch panel according to claim 12 , wherein the proximity sense electrode is made from ITO (Indium Tin Oxide).
16. The touch panel according to claim 12 , further comprising a resonance frequency capacitor that is connected to one end and another end of the proximity sense electrode to define a resonance frequency of the proximity sense electrode, wherein
the proximity sense electrodes has a U-shape.
17. The touch panel according to claim 12 , further comprising a plurality of drive layer proximity sense electrodes that are in the drive layer to have a resonance frequency of the coil in order to detect the proximity of the coil, wherein
the plurality of drive layer proximity sense electrodes are arranged at positions corresponding to the respective plurality of drive electrodes.
18. The touch panel according to claim 12 , wherein
the touch panel is built in a liquid crystal display panel,
the liquid crystal display panel includes a circuit substrate, a facing substrate that is arranged opposing the circuit substrate, and a liquid crystal layer that is between the circuit substrate and the facing substrate, and
the drive layer and the sense layer are in the circuit substrate.
19. The touch panel according to claim 12 , wherein
the touch panel is built in a liquid crystal display panel,
the liquid crystal display panel includes a circuit substrate, a facing substrate that is arranged facing the circuit substrate, and a liquid crystal layer that is between the circuit substrate and the facing substrate,
the drive layer is in one of the circuit substrate and the facing substrate, and
the sense layer is in the other of the circuit substrate and the facing substrate.
20. The touch panel according to claim 12 , wherein
the touch panel is built in a liquid crystal display panel,
the liquid crystal display panel includes a circuit substrate, a facing substrate that is arranged facing the circuit substrate, and a liquid crystal layer that is between the circuit substrate and the facing substrate, and
the drive layer and the sense layer are in the facing substrate.
21. The touch panel according to claim 12 , wherein the coil is provided in a stylus pen by which information is input to the touch panel.
22. A touch panel system comprising:
a touch panel including:
a plurality of drive electrodes that are in a drive layer along a first direction; and
a plurality of touch sense electrodes that are in a sense layer, which is insulated from the drive layer, along a second direction crossing the plurality of drive electrodes, wherein a proximity sense electrode by each of which proximity of a coil is detected is provided in the sense layer, and
a controller that controls the touch panel, wherein
the controller includes:
a drive circuit that applies drive voltages to the plurality of drive electrodes for a touch detection period in which a touch to the touch panel is detected and that applies coil detection voltages to the plurality of drive electrodes for a coil detection period in which the proximity of the coil is detected, and
a detection circuit that detects a touch position for the touch detection period by reading out, along the plurality of touch sense electrodes, linear sum signals that are based on the drive voltages applied to the plurality of drive electrodes and are originated from charges of a plurality of capacitors, and that detects the proximity of the coil for the coil detection period by reading out, along the plurality of touch sense electrodes, linear sum signals that are based on the coil detection voltages applied to the drive plurality of electrodes, are originated from the charges of the plurality of capacitors, and are affected by a change of a coupled charge between the proximity sense electrode and a corresponding one of the plurality of touch sense electrodes due to the proximity of the coil, and
a frequency modulator that receives, from the proximity sense electrode, a signal based on a resonance frequency of the coil, modulates a frequency of the signal, and supplies the resultant to an RFID transmitter/receiver or the controller.