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：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：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：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).