Detection device and display device
A detection device and a display device include first electrodes, second electrodes, a detector, and a coupling circuit. The first electrodes are disposed side by side in a first direction and a second direction intersecting the first direction. The second electrodes are disposed on the side facing the first electrodes and extend in the second direction. The detector receives a first detection signal output from the second electrodes based on changes in capacitance between the first electrodes and the second electrodes or a second detection signal output from the first electrodes based on changes in capacitance in the first electrodes.
1. A detection device comprising:
a plurality of first electrodes disposed side by side in a first direction and a second direction intersecting the first direction;
a plurality of second electrodes disposed on a side facing the first electrodes and extending in the second direction; and
a detection circuit,
wherein in a first detection signal period,
the first electrodes arrayed in the first direction among the plurality of first electrodes are electrically coupled to form a first drive electrode block,
a first drive signal is supplied to the first drive electrode block, and
the detection circuit is configured to detect a first detection signal output from the second electrode in response to a change in capacitance between the first drive electrode block and the second electrode, and
in a second detection signal period,
at least two or more of the first electrodes arrayed in the second direction among the plurality of first electrodes are electrically coupled to form a second drive electrode block,
a second drive signal is supplied to the second drive electrode block, and
the detection circuit is configured to detect a second detection signal output from the second drive electrode block in response to a change in capacitance in the second drive electrode block.
2. The detection device according to claim 1 , further comprising a coupling circuit, wherein
the coupling circuit couples at least two or more of the first electrodes to one another in the first direction and the second direction to form the second drive electrode block, and
the second drive electrode block has a larger number of first electrodes arrayed in the second direction than the number of first electrodes arrayed in the second direction of the first drive electrode block.
3. The detection device according to claim 1 , further comprising a drive circuit configured to supply the first drive signal to the first drive electrode block and the second drive signal to the second drive electrode block,
wherein
the first detection signal is output from the second electrodes when the first drive signal is supplied to the first drive electrode block, and
the second detection signal is output from the second drive electrode block when the second drive signal is supplied to the second drive electrode block.
4. The detection device according to claim 3 , wherein the drive circuit supplies, to the second electrodes, a guard signal having the same waveform as a waveform of the second drive signal and synchronized with the second drive signal in the second detection signal period when the detection circuit detects the second detection signal.
5. The detection device according to claim 1 , wherein
the second electrodes are not electrically coupled to any component in the second detection signal period when the detection circuit detects the second detection signal.
6. The detection device according to claim 2 , further comprising
a plurality of wires coupled to the first electrodes, wherein
the coupling circuit includes a switching element configured to couple or cut off between a first wire and a second wire of the wires.
7. The detection device according to claim 2 , further comprising:
a controller configured to control the coupling circuit, wherein
the controller changes the number of first electrodes included in one second drive electrode block based on the second detection signal.
8. A display device comprising:
a detection device;
a substrate having a display region and a frame region surrounding the display region; and
a display functional layer configured to display an image in the display region, wherein the detection device comprises:
a plurality of first electrodes disposed side by side in a first direction and a second direction intersecting the first direction, the first electrodes being provided in the display region;
a plurality of second electrodes disposed on a side facing the first electrodes and extending in the second direction; and
a detection circuit,
wherein in a first detection signal period,
the first electrodes arrayed in the first direction among the plurality of first electrodes are electrically coupled to form a first drive electrode block,
a first drive signal is supplied to the first drive electrode block, and
the detection circuit is configured to detect a first detection signal output from the second electrode in response to a change in capacitance between the first drive electrode block and the second electrode, and
in a second detection signal period,
at least two or more of the first electrodes arrayed in the second direction among the plurality of first electrodes are electrically coupled to form a second drive electrode block,
a second drive signal is supplied to the second drive electrode block, and
the detection circuit is configured to detect a second detection signal output from the second drive electrode block in response to a change in capacitance in the second drive electrode block.
9. The display device according to claim 8 , further comprising:
a coupling circuit configured to form the first drive electrode block in the first detection signal period and the second drive electrode block in the second detection signal period;
wherein the coupling circuit is disposed in the frame region.