# US 2020/0401267 A1 · Detection device and display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0401267 A1 - Document ID: US20200401267A1 - Status: Published application - Kind: A1 - Application number: 17/012,988 - Filed: 2020-09-04 - Published: 2020-12-24 - Earliest claimed: 2018-03-05 - Assignees: Japan Display Inc. - Applicants: Japan Display Inc. - Inventors: Shota HOSAKA; Takayuki NAKANISHI; Naoki TAKADA; Fumitaka GOTOH - Web page: https://patentgrep.com/patent/US20200401267A1 ## CPC - G06F 3/0418: {for error correction or compensation, e.g. based on parallax, calibration or alignment} - G06F 3/04166: {Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184)} - G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes} - G06F 3/0412: {Digitisers structurally integrated in a display} - G06F 2203/04108: Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract A detection device comprising: a plurality of first electrodes; a plurality of second electrodes facing or being close to the first electrodes; a first drive circuit configured to supply a first drive signal to the first electrodes; a second drive circuit configured to supply a second drive signal to the second electrodes, the second drive signal having a same waveform as that of the first drive signal and in synchronization with the first drive signal; and a detector configured to detect a first detection signal, a second detection signal, and a third detection signal. ## Claims ### Claim 1 A detection device comprising: a plurality of first electrodes; a plurality of second electrodes facing or being close to the first electrodes; a first drive circuit configured to supply a first drive signal to the first electrodes; a second drive circuit configured to supply a second drive signal to the second electrodes, the second drive signal having a same waveform as that of the first drive signal and in synchronization with the first drive signal; and a detector configured to detect a first detection signal output from the first electrodes in response to a supply of the second drive signal to the second electrodes, a second detection signal output from the first electrodes in response to a supply of the first drive signal to the first electrodes and a supply of the second drive signal to the second electrodes, and a third detection signal output from the first electrodes in response to a supply of the second drive signal to the second electrodes, wherein the detector is configured to detect the second detection signal and the third detection signal when a detection value of the first detection signal is lower than a threshold, and to correct a detection value of the second detection signal on a basis of the detection value of the third detection signal. ### Claim 2 (depends on 1) The detection device according to claim 1, wherein the detector is configured to hold a reference detection value of the third detection signal detected at a predetermined reference temperature when the detection value of the first detection signal is lower than the threshold, and multiply the detection value of the second detection signal by a ratio of the reference detection value to the detection value of the third detection signal. ### Claim 3 (depends on 1) The detection device according to claim 1, wherein the first electrodes are arranged side by side in a first direction and a second direction intersecting the first direction, the second electrodes extend in the second direction, and the detection device further comprises a coupling circuit configured to couple the first electrodes to one another in the first direction to form a first electrode block in a period in which the detector detects the first detection signal, and couple at least two or more of the first electrodes to one another at least in the second direction to form a second electrode block in a period in which the detector detects the second detection signal. ### Claim 4 (depends on 3) The detection device according to claim 3, wherein the coupling circuit is configured to couple at least two or more of the first electrodes to one another in the first direction and the second direction to form the second electrode block such that a larger number of the first electrodes are arranged in the second direction than in the first electrode block. ### Claim 5 (depends on 1) A display device comprising: the detection device as claimed in claim 1; a substrate having a display region; a display functional layer for displaying an image in the display region; and a controller configured to provide a first period in which the detector detects the first detection signal in one frame period for displaying the image in the display region, and provide, when a detection value of the first detection signal is lower than the threshold, a second period in which the detector detects the second detection signal and a third period in which the detector detects the third detection signal in the one frame period. ### Claim 6 (depends on 5) The display device according to claim 5, wherein the detector: detects the first detection signal a predetermined number of times in the first period; detects the second detection signal a predetermined number of times in the second period; and detects the third detection signal a predetermined number of times in the third period. ### Claim 7 A detection device comprising: a plurality of first electrodes; a plurality of second electrodes disposed facing or being close to the first electrodes; a first drive circuit configured to supply a first drive signal to the first electrodes; a second drive circuit configured to supply a second drive signal to the second electrodes, the second drive signal having a same waveform as that of the first drive signal and in synchronization with the first drive signal; and a detector configured to detect a first detection signal output from the first electrodes in response to a supply of the second drive signal to the second electrodes, a second detection signal output from the first electrodes in response to a supply of the first drive signal to the first electrodes and a supply of the second drive signal to the second electrodes, and a third detection signal output from the first electrodes in response to a supply of the first drive signal to the first electrodes, wherein the detector is configured to detect the second detection signal and the third detection signal when a detection value of the first detection signal is lower than a threshold, and to correct a detection value of the second detection signal on a basis of the detection value of the third detection signal. ### Claim 8 (depends on 7) The detection device according to claim 7, wherein the detector is configured to hold a reference detection value of the third detection signal detected at a predetermined reference temperature when the detection value of the first detection signal is lower than the threshold, and multiply the detection value of the second detection signal by a ratio of the reference detection value to the detection value of the third detection signal. ### Claim 9 (depends on 7) The detection device according to claim 7, wherein the first electrodes are arranged side by side in a first direction and a second direction intersecting the first direction, the second electrodes extend in the second direction, and the detection device further comprises a coupling circuit configured to couple the first electrodes to one another in the first direction to form a first electrode block in a period in which the detector detects the first detection signal, and couple at least two or more of the first electrodes to one another at least in the second direction to form a second electrode block in a period in which the detector detects the second detection signal. ### Claim 10 (depends on 9) The detection device according to claim 9, wherein the coupling circuit is configured to couple at least two or more of the first electrodes to one another in the first direction and the second direction to form the second electrode block such that a larger number of the first electrodes are arranged in the second direction than in the first electrode block. ### Claim 11 (depends on 7) A display device comprising: the detection device as claimed in claim 7; a substrate having a display region; a display functional layer for displaying an image in the display region; and a controller configured to provide a first period in which the detector detects the first detection signal in one frame period for displaying the image in the display region, and provide, when a detection value of the first detection signal is lower than the threshold, a second period in which the detector detects the second detection signal and a third period in which the detector detects the third detection signal in the one frame period. ### Claim 12 (depends on 11) The display device according to claim 11, wherein the detector: detects the first detection signal a predetermined number of times in the first period; detects the second detection signal a predetermined number of times in the second period; and detects the third detection signal a predetermined number of times in the third period.