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US 10,649,582 B2Granted
Detection apparatus, display apparatus, and detection method
AssigneeJapan Display Inc.
InventorsToshinori Uehara, Hayato Kurasawa
Life of this patent
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Abstract
A detection apparatus includes a first substrate, a first electrode, a plurality of second electrodes, a detection controller, and a second electrode controller. The first electrode is disposed on the first substrate. The second electrodes have an area smaller than the area of the first electrode and overlap the first electrode. The detection controller is coupled to the first electrode and detects a detection signal corresponding to a capacitance change in the first electrode. The second electrode controller supplies, to some of second electrodes in the second electrodes, a guard signal for suppressing a capacitance change in overlapping areas of the first electrode overlapping the respective second electrodes.
Claims16
A detection apparatus comprising:
- a first substrate;
- a first electrode disposed on the first substrate;
- a plurality of second electrodes having an area smaller than an area of the first electrode and overlapping the first electrode;
- a detection controller coupled to the first electrode and configured to detect a detection signal corresponding to a capacitance change in the first electrode;
- and
- a second electrode controller configured to supply, to some of second electrodes in the second electrodes, a guard signal for suppressing a capacitance change in overlapping areas of the first electrode overlapping the respective second electrodes, wherein
- the second electrode controller is configured to bring second electrodes serving as a first selection target out of the second electrodes into a floating state where an electric potential is not fixed and is configured to supply the guard signal to second electrodes serving as a second selection target not included in the first selection target,
- the second electrode controller is configured to perform a first selection operation for bringing the second electrodes serving as the first selection target into a floating state and is configured to perform a second selection operation for bringing the second electrodes serving as the second selection target into a floating state at a timing different from a timing of the first selection operation,
- a first detection signal is output from the first electrode to the detection controller in the first selection operation, and a second detection signal is output from the first electrode to the detection controller in the second selection operation, and
- the detection controller includes a calculator configured to calculate difference between the first detection signal and the second detection signal.
7 more elements
A detection method performed by a detection apparatus including:
- a first substrate;
- a first electrode disposed on the first substrate;
- a plurality of second electrodes having an area smaller than the area of the first electrode and overlapping the first electrode;
- a detection controller coupled to the first electrode and configured to detect a detection signal corresponding to a capacitance change in the first electrode;
- and
- a second electrode controller configured to select some of second electrodes in the second electrodes, the detection method comprising step of
- supplying, to the some of the second electrodes by the second electrode controller, a guard signal for suppressing a capacitance change in overlapping areas of the first electrode overlapping the respective second electrodes and supplying a detection signal corresponding to the capacitance change in the first electrode to the detection controller, wherein
- the second electrode controller is configured to bring second electrodes serving as a first selection target out of the second electrodes into a floating state where an electric potential is not fixed and is configured to supply the guard signal to second electrodes serving as a second selection target not included in the first selection target,
- the second electrode controller is configured to perform a first selection operation for bringing the second electrodes serving as the first selection target into a floating state and is configured to perform a second selection operation for bringing the second electrodes serving as the second selection target into a floating state at a timing different from a timing of the first selection operation,
- a first detection signal is output from the first electrode to the detection controller in the first selection operation, and a second detection signal is output from the first electrode to the detection controller in the second selection operation, and
- the detection controller includes a calculator configured to calculate difference between the first detection signal and the second detection signal.
8 more elements
A detection apparatus comprising:
- a first substrate;
- a first electrode disposed on the first substrate;
- a plurality of second electrodes having an area smaller than an area of the first electrode and overlapping the first electrode;
- a detection controller coupled to the first electrode and configured to detect a detection signal corresponding to a capacitance change in the first electrode;
- and
- a second electrode controller configured to supply, to some of second electrodes in the second electrodes, a guard signal for suppressing a capacitance change in overlapping areas of the first electrode overlapping the respective second electrodes, wherein
- the second electrode controller is configured to bring second electrodes serving as a first selection target out of the second electrodes into a floating state where an electric potential is not fixed and is configured to supply the guard signal to second electrodes serving as a second selection target not included in the first selection target,
- wherein the second electrode controller is configured to select the second electrodes serving as the first selection target and the second electrodes serving as the second selection target corresponding to a selection signal that is based on a predetermined code, and
- the selection signal based on the predetermined code is a signal that is based on a Hadamard matrix.
6 more elements
Dependencies are inferred from the claim text.