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1. 发明公开

US20240102871A1 Force Input Localisation 审中-公开
公开(公告)号：US20240102871A1
公开(公告)日：2024-03-28
申请号：US18273470
申请日：2022-01-21
申请人： Cambridge Touch Technologies Ltd.
发明人： Constantinos Tsangarides , Michael Astley , Riccardo Micci , Jiahao Li
IPC分类号： G01L1/16
CPC分类号： G01L1/16 , G06F3/04144
摘要： A device (15) including a piezoelectric sensor (16). The piezoelectric sensor (16) includes a layer of piezoelectric material (7) disposed between a number of sensing electrodes (4, 12, 13) and at least one counter electrode (3). The device (15) also includes a controller (17) connected to the piezoelectric sensor (16). The sensing electrodes (4, 12, 13) are arranged to form one or more active regions (19). Each active region (19) includes one or more primary sensing electrodes (4,12) and one or more secondary sensing electrodes (4, 13). The secondary sensing electrodes (4, 13) are separated from the primary sensing electrodes (4, 12) by a perimeter (14). The controller (17) is configured, for each active region (19), to monitor primary piezoelectric charges induced on each primary sensing electrode (4, 12) and to monitor secondary piezoelectric charges induced on each secondary sensing electrode (4, 13). The controller (17) is also configured, in response to detecting one or more primary and/or secondary piezoelectric charges, to determine whether a corresponding applied force has a centroid within the perimeter (14) based on comparing the primary piezoelectric charges to the secondary piezoelectric charges.

2. 发明授权

US11249575B2 Force signal processing 有权
公开(公告)号：US11249575B2
公开(公告)日：2022-02-15
申请号：US16909248
申请日：2020-06-23
申请人： Cambridge Touch Technologies Ltd.
发明人： Riccardo Micci , Arokia Nathan
IPC分类号： G06F3/041 , G06F3/044
摘要： A method of processing a number of force values is described. Each force value corresponds to a sensor location. The sensor locations are spaced apart along a direction. The method includes receiving the force values (S11). The method also includes determining whether the force values include one or more candidate peaks (S12). Each candidate peak corresponds to a local maximum of the force values. The method also includes, in response to at least one candidate peak exceeds a minimum force threshold (S13), interpolating the force values and estimating a number of peak coordinates and corresponding peak force values based on the interpolated force values and the candidate peaks (S14) which exceed the minimum force threshold.

3. 发明申请

US20210055832A1 Touch panel pressure detection 有权
公开(公告)号：US20210055832A1
公开(公告)日：2021-02-25
申请号：US16636668
申请日：2018-08-07
申请人： Cambridge Touch Technologies Ltd.
发明人： Mojtaba Bagheri
IPC分类号： G06F3/044 , G06F3/041
摘要： A device for touch panel pressure detection includes a plurality of first input/output terminals for a projected capacitance touch panel. The projected capacitance touch panel includes a layer of piezoelectric material disposed between a plurality of sensing electrodes and a common electrode. The device also includes one or more amplifiers. Each amplifier has an inverting input, a non-inverting input and an output. The non-inverting input of the or each amplifier is configured to be switched between a common mode voltage and a capacitance measurement signal. The inverting input of the or each amplifier is configured to drive an input/output terminal based on the capacitance measurement signal. The amplifier is configured such that, when an input/output terminal is connected to a sensing electrode, the amplifier output varies in dependence upon a pressure applied to the touch panel.

4. 发明授权

US10852875B2 Pressure sensing apparatus and method 有权
公开(公告)号：US10852875B2
公开(公告)日：2020-12-01
申请号：US16430549
申请日：2019-06-04
申请人： Cambridge Touch Technologies Ltd.
发明人： Paul Routley , Babak Bastani , Riccardo Micci , Arokia Nathan
IPC分类号： G06F3/041 , G01L1/16 , G01L1/26 , G06F3/044 , G01L1/14
摘要： Apparatus (22) for processing signals from a touch panel (10) is described. The touch panel (10) includes a layer of piezoelectric material (16) disposed between a plurality of sensing electrodes (14, 20) and at least one common electrode (15). The apparatus (22) includes a first circuit (23) for connection to the plurality of sensing electrodes (14, 20). The first circuit (23) is configured to generate a plurality of first pressure signals (29). Each first pressure signal (29) corresponds to one or more sensing electrodes (14, 20) and is indicative of a pressure acting on the touch panel (10) proximate to the corresponding one or more sensing electrodes (14, 20). The apparatus (22) also includes a second circuit (24) for connection to the at least one common electrode (15). The second circuit (24) is configured to generate a second pressure signal (30) indicative of a total pressure applied to the touch panel (10). The apparatus (22) also includes a controller (25) configured to determine an external interference signal (32) based on a weighted sum over the second pressure signal (30) and the plurality of first pressure signals (29). The controller (25) is also configured to compare the external interference signal (32) against a pre-calibrated threshold (Vthresh). The controller is also configured, in response to the external interference signal (32) being greater than or equal to the pre-calibrated threshold (Vthresh), to output an interference flag (Intflag) indicating that the first and second pressure signals (29, 30) are influenced by coupling to one or more external electrical fields.

5. 发明授权

US10496210B2 Pressure sensing display device 有权
公开(公告)号：US10496210B2
公开(公告)日：2019-12-03
申请号：US15876172
申请日：2018-01-21
申请人： Cambridge Touch Technologies Ltd.
发明人： Arokia Nathan , Jackson Chi-Sun Lai , Suk-Bae Cha , Corbin Church
IPC分类号： G06F3/041 , G06F3/044
CPC分类号： G06F3/0414 , G06F3/0412 , G06F3/04144 , G06F2203/04106
摘要： A pressure sensing architecture for use with liquid crystal (LC), organic light emitting diode (OLED), electrophoretic, or other similarly fabricated displays. The described architecture includes a bottom TFT structure and a top structure with color filter material, and with liquid crystal, electrophoretic or OLED material provided in between. A piezoelectric or equivalent material is provided within the display assembly. Transmitting and receiving electrodes can be used to electrically bias the piezoelectric or equivalent material, which provides an analog electrical signal in response to incident touch pressure.

6. 发明授权

US10430009B2 Pressure-sensitive touch panel 有权
公开(公告)号：US10430009B2
公开(公告)日：2019-10-01
申请号：US16356538
申请日：2019-03-18
申请人： Cambridge Touch Technologies Ltd.
发明人： Arokia Nathan , Simon Banks
IPC分类号： G06F3/044 , G06F3/041
摘要： A device (48) for combined capacitance and pressure measurements includes a number of first input/output terminals for a projected capacitance touch panel, wherein the projected capacitance touch panel includes a layer of piezoelectric material disposed between a plurality of first electrodes and at least one second electrode. The device also includes a plurality of second input/output terminals for a capacitive touch controller. The device also includes a plurality of separation stages, each separation stage connecting at least one first input/output terminal to a corresponding second input/output terminal, and each separation stage including a first frequency-dependent filter for filtering signals between first and second input/output terminals. The device also includes at least one amplification stage, each amplification stage having at least one input and an output configured to provide an amplified signal, wherein the number of amplification stages is less than or equal to the number of separation stages and each amplification stage input is connected to one or more of the first input/output terminals through the respective separation stage(s). Each amplification stage or each separation stage includes a second frequency-dependent filter for filtering signals between the respective first input/output terminal and an amplification stage input. Each first frequency-dependent filter is configured to pass signals to and/or from the capacitive touch controller and each second frequency-dependent filter is configured to attenuate signals from the capacitive touch controller.

7. 发明授权

US10254894B2 Pressure-sensitive touch panel 有权
公开(公告)号：US10254894B2
公开(公告)日：2019-04-09
申请号：US15386612
申请日：2016-12-21
申请人： Cambridge Touch Technologies Ltd.
发明人： Arokia Nathan , Simon Banks
IPC分类号： G06F3/041 , G06F3/045 , G06F3/044
摘要： A device for combined capacitance and pressure measurements includes a plurality of first input/output terminals for a projected capacitance touch panel wherein the projected capacitance touch panel includes a layer of piezoelectric material disposed between a plurality of sensing electrodes and a common electrode. The device also includes a plurality of second input/output terminals for a capacitive touch controller. The device also includes a plurality of separation stages, each separation stage connecting one first input/output terminal to a corresponding second input/output terminal, and each separation stage includes a first frequency-dependent filter for filtering signals between respective first and second input/output terminals. The device also includes at least one amplification stage, each amplification stage having at least one input and an output configured to provide an amplified signal, wherein the number of amplification stages is less than or equal to the number of separation stages and each amplification stage input is connected to one or more of the first input/output terminals through the respective separation stage(s) Each amplification stage or each separation stage includes a second frequency-dependent filter for filtering signals between the respective first input/output terminal and an amplification stage input. Each first frequency-dependent filter is configured to pass signals from the capacitive touch controller and each second frequency-dependent filter is configured to attenuate signals from the capacitive touch controller.

8. 发明授权

US11494022B2 Force sensing touch panel 有权
公开(公告)号：US11494022B2
公开(公告)日：2022-11-08
申请号：US17432000
申请日：2020-02-17
申请人： Cambridge Touch Technologies Ltd.
发明人： Michael Astley , Arokia Nathan , Constantinos Tsangarides , Paridhi Sharma , Antonio Afonso Bras Ferreira Marques , Xiang Cheng , Jiahao Li
IPC分类号： G06F3/041 , G06F3/044
摘要： A force-sensing touch panel (31) is described which includes a layer structure stacked in a thickness direction between first and second surfaces. The layer structure includes from first surface to second surface, a number of first electrodes (7) and a number of second electrodes (8), a layer of piezoelectric material (9), and a number of third electrodes (30). The first and second electrodes (7, 8) are configured to define a coordinate system for sensing a location of a force applied to the touch panel in a plane perpendicular to the thickness direction. The third electrodes (30) are configured such that signals received from the first, second and third electrodes (7, 8, 30) enable determining unique locations corresponding to two or more forces applied to the touch panel (31) concurrently.

9. 发明授权

US11474653B2 Buttonless device 有权
公开(公告)号：US11474653B2
公开(公告)日：2022-10-18
申请号：US17077123
申请日：2020-10-22
申请人： Cambridge Touch Technologies Ltd.
发明人： Antonio Afonso Bras Ferreira Marques , Arokia Nathan , Michael Astley , Jiahao Li , Xiang Cheng , Paridhi Sharma , Constantinos Tsangarides
IPC分类号： G09G5/00 , G06F3/044 , H01L41/113
摘要： A device (1) includes a body (2) and a touch panel (3) supported by, integrated with, or underlying the body (2). The touch panel (3) includes a layer of piezoelectric material (5) disposed between a plurality of first electrodes (6) and at least one second electrode (7). The device (1) also includes at least one second piezoelectric input region (8) supported by, integrated with, or underlying a portion of the body (2) which does not correspond to the touch panel (3). The device (1) is configured to receive user input using the touch panel (3) and/or at least one piezoelectric input region (8).

10. 发明申请

US20220171489A1 Force Sensing Touch Panel 有权
公开(公告)号：US20220171489A1
公开(公告)日：2022-06-02
申请号：US17436545
申请日：2020-03-13
申请人： Cambridge Touch Technologies Ltd.
发明人： Arokia Nathan , Michael Astley , Constantinos Tsangarides , Paridhi Sharma , Riccardo Micci , Xiang Cheng , Jiahao Li
IPC分类号： G06F3/041 , G06F3/044
摘要： An apparatus (2, 22) is described which includes a touch panel (1, 21). The touch panel (1, 21) includes a layer of piezoelectric material (4) disposed between a number of sensing electrodes (5, 23, 24) and at least one counter electrode (6). The apparatus (2, 22) also includes a touch controller (3) connected to the touch panel (1, 21). The touch controller (3) is configured to determine, in response to receiving piezoelectric signals (7) from one or more of the sensing electrodes (5, 23, 24), a location (9) and an applied force (10) corresponding to a user interaction (11) with the touch panel (1, 21). The touch controller (3) is configured to determine a capacitance value (20) of one or more of the sensing electrodes (5). The touch controller is configured to operate in a force-based mode, a capacitance-based mode or a mixed force-capacitance mode depending on the type of input received.

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