公开(公告)号：WO2019234430A1

公开(公告)日：2019-12-12

申请号：PCT/GB2019/051568

申请日：2019-06-06

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD

Inventor： ASTLEY, Michael ,  CHENG, Xiang ,  LI, Jiahao ,  ROUTLEY, Paul ,  MICCI, Riccardo ,  BASTANI, Babak ,  NATHAN, Arokia

IPC: G06F3/041 ,  G06F3/044

Abstract: A touch panel (10) including a layer of piezoelectric material (16) disposed between a number of sensing electrodes (14, 20) and at least one common electrode (15). The apparatus (73) including a capacitive touch controller (69) connected to the sensing electrodes and a switch network (74) including a number of inputs connected to some or all sensing electrodes, and an output connected to system ground or a common mode voltage (VCM). The apparatus also includes a controller (25) and a second circuit (24, 44) receiving signals from the at least one common electrode and generating, based thereon, a second pressure signal (30) indicative of a total pressure applied to the touch panel. The controller is configured to control the switch network to couple any connected sensing electrodes to system ground or the common mode voltage during a pressure measurement period, and to estimate the total pressure based on the second pressure signal during the pressure measurement period.

公开(公告)号：WO2020183194A1

公开(公告)日：2020-09-17

申请号：PCT/GB2020/050645

申请日：2020-03-13

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD.

Inventor： NATHAN, Arokia ,  ASTLEY, Michael ,  LI, Jiahao ,  MICCI, Riccardo ,  TSANGARIDES, Constantinos ,  SHARMA, Paridhi ,  CHENG, Xiang

IPC: G06F3/041 ,  G06F3/044

Abstract: 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.

公开(公告)号：WO2020245555A1

公开(公告)日：2020-12-10

申请号：PCT/GB2019/053434

申请日：2019-12-05

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD

Inventor： ASTLEY, Michael ,  CHENG, Xiang ,  LI, Jiahao ,  ROUTLEY, Paul ,  MICCI, Riccardo ,  BASTANI, Babak ,  NATHAN, Arokia

IPC: G06F3/044 ,  G06F3/041

Abstract: Apparatus (104) for processing signals from a touch panel (108) that includes a piezoelectric material layer (16) disposed between a number of sensing electrodes (14,20) and one or more common electrodes (105). The apparatus includes a capacitive touch controller (69) for connection to the sensing electrodes; a switch network (74) including a number of inputs connected to some or all sensing electrodes, and an output connected to system ground or a common mode voltage (V CM ); a second circuit (106) for connection to the one or more common electrodes and configured to generate, for each common electrode, a corresponding pressure signal (30) indicative of a pressure applied proximate to that common electrode and a controller (25) configured during the pressure measurement period to control the switch network to couple any connected sensing electrodes to system ground or the common mode voltage and to sample the pressure signals.

公开(公告)号：WO2022157478A1

公开(公告)日：2022-07-28

申请号：PCT/GB2022/000007

申请日：2022-01-21

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD

Inventor： TSANGARIDES, Constantinos ,  ASTLEY, Michael ,  MICCI, Riccardo ,  LI, Jiahao

IPC: G06F3/041 ,  G01L1/16 ,  H03K17/96

Abstract: 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.

公开(公告)号：WO2020152464A3

公开(公告)日：2020-07-30

申请号：PCT/GB2020/050151

申请日：2020-01-23

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD.

Inventor： TSANGARIDES, Constantinos ,  SHARMA, Paridhi ,  CHENG, Xiang ,  LI, Jiahao ,  ASTLEY, Michael ,  NATHAN, Arokia

IPC: G06F3/041 ,  G06F3/044

Abstract: A touch sensor (1) for combined capacitive touch and force sensing is described. The touch sensor (1) includes number plurality of first electrodes (4) and a number of second electrodes (5). The second electrodes (5) are insulated from the first electrodes (4). The first and second electrodes (4, 5) form a grid for capacitive touch sensing. The touch sensor (1) also includes a transparent cover (6). The touch sensor (1) also includes a transparent piezoelectric film (3) arranged between the transparent cover (6) and the first and second electrodes (4, 5). The touch sensor (1) also includes a patterned counter electrode (8) disposed between the transparent piezoelectric film (3) and the transparent cover (6). The patterned counter electrode (8) is a conductive grid formed from the union of plurality of counter electrode line elements (9). A pitch of the counter electrode line elements (9) is larger than a pitch of the first electrodes (4) and/or second electrodes (5).

公开(公告)号：WO2020152464A2

公开(公告)日：2020-07-30

申请号：PCT/GB2020/050151

申请日：2020-01-23

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD.

Inventor： TSANGARIDES, Constantinos ,  SHARMA, Paridhi ,  CHENG, Xiang ,  LI, Jiahao ,  ASTLEY, Michael ,  NATHAN, Arokia

IPC: G06F3/041 ,  G06F3/044

Abstract: A touch sensor (1) for combined capacitive touch and force sensing is described. The touch sensor (1) includes number plurality of first electrodes (4) and a number of second electrodes (5). The second electrodes (5) are insulated from the first electrodes (4). The first and second electrodes (4, 5) form a grid for capacitive touch sensing. The touch sensor (1) also includes a transparent cover (6). The touch sensor (1) also includes a transparent piezoelectric film (3) arranged between the transparent cover (6) and the first and second electrodes (4, 5). The touch sensor (1) also includes a patterned counter electrode (8) disposed between the transparent piezoelectric film (3) and the transparent cover (6). The patterned counter electrode (8) is a conductive grid formed from the union of plurality of counter electrode line elements (9). A pitch of the counter electrode line elements (9) is larger than a pitch of the first electrodes (4) and/or second electrodes (5).

公开(公告)号：WO2022157478A8

公开(公告)日：2022-07-28

申请号：PCT/GB2022/000007

申请日：2022-01-21

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD

Inventor： TSANGARIDES, Constantinos ,  ASTLEY, Michael ,  MICCI, Riccardo ,  LI, Jiahao

IPC: G06F3/041 ,  G01L1/16 ,  H03K17/96 ,  G01L5/167 ,  G01L9/008 ,  G01L9/08 ,  G06F3/0414 ,  G06F3/04166 ,  H03K17/9643 ,  H03K2017/9602

Abstract: 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.

公开(公告)号：WO2020245554A1

公开(公告)日：2020-12-10

申请号：PCT/GB2019/051605

申请日：2019-06-07

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD

Inventor： ASTLEY, Michael ,  CHENG, Xiang ,  LI, Jiahao ,  ROUTLEY, Paul ,  MICCI, Riccardo ,  BASTANI, Babak ,  NATHAN, Arokia

IPC: G06F3/041 ,  G06F3/044

Abstract: An apparatus (73) for processing signals from a touch panel (10) is described. The touch panel (10) includes a layer of piezoelectric material (16) disposed between a number of sensing electrodes (14, 20) and at least one common electrode (15). The apparatus (73) includes a capacitive touch controller (69) for connection to the sensing electrodes (14, 20). The apparatus (73) also includes a switch network (74) including a number of inputs for connection to some or all of the sensing electrodes (14, 20), and an output connected to system ground or a common mode voltage (VCM). The apparatus (73) also includes a second circuit (24, 44) for connection to the at least one common electrode (15) and configured to generate, based on signals received from the at least one common electrode, a second pressure signal (30) indicative of a total pressure applied to the touch panel (10). The apparatus (73) also includes a controller (25) configured to control the switch network (74) to couple any connected sensing electrodes (14, 20) to system ground or the common mode voltage (VCM) during a pressure measurement period, and to determine an estimate of the total pressure based on the second pressure signal during the pressure measurement period.

公开(公告)号：WO2020169953A1

公开(公告)日：2020-08-27

申请号：PCT/GB2020/050368

申请日：2020-02-17

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD.

Inventor： ASTLEY, Michael ,  NATHAN, Arokia ,  TSANGARIDES, Constantinos ,  SHARMA, Paridhi ,  CHENG, Xiang ,  LI, Jiahao ,  MARQUES, Afonso

IPC: G06F3/041 ,  G06F3/044

Abstract: 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.

公开(公告)号：WO2019234429A1

公开(公告)日：2019-12-12

申请号：PCT/GB2019/051567

申请日：2019-06-06

Applicant: CAMBRIDGE TOUCH TECHNOLOGIES LTD

Inventor： ROUTLEY, Paul ,  MICCI, Riccardo ,  BASTANI, Babak ,  NATHAN, Arokia ,  ASTLEY, Michael ,  CHENG, Xiang ,  LI, Jiahao

IPC: G06F3/041 ,  G06F3/044

Abstract: Apparatus (22) for processing touch panel signals. Touch panel (10) includes a piezoelectric material layer (16) disposed between a plurality of sensing electrodes (14, 20) and at least one common electrode (15). The apparatus includes a controller (25) and a first and a second circuit (23, 24) for connection to the plurality of sensing electrodes and to the at least one common electrode respectively. The first circuit generates one or more first pressure signals (29) corresponding to one or more sensing electrodes indicative of a pressure acting on the touch panel proximate to the corresponding sensing electrode. The second circuit generates a second pressure signal (30) indicative of a total pressure applied to the touch panel. The controller estimates the total pressure based on a weighted difference of the second pressure signal and a sum over the one or more first pressure signals.