公开(公告)号：CA2745422A1

公开(公告)日：2010-06-10

申请号：CA2745422

申请日：2009-12-02

Applicant: FLATFROG LAB AB

Inventor： FAHRAEUS CHRISTER ,  WALL HENRIK ,  WASSVIK OLA ,  CHRISTIANSSON TOMAS

IPC: G06F3/042

Abstract: A touch sensing apparatus is controlled to determine the position of one or more objects (7) that interact with a touch surface (1). The apparatus includes a group of emitters (2) arranged to emit light to illuminate at least part of the touch surface (1), a light detector (4) arranged to receive light from the group of emitters (2), and a processing element (7). Each emitter (2) is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter (2). The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters (2). The processing element processes an output signal from the light detector (4) to separate the light received from the individual emitters (2) based on the transmitted codes, and to determine the position of the object/objects (7) based on the light received from the individual emitters (2), e.g. using triangulation or image reconstruction such as an algorithm for transmission tomography.

公开(公告)号：SE1830086A1

公开(公告)日：2019-09-17

申请号：SE1830086

申请日：2018-03-16

Applicant: FLATFROG LAB AB

Inventor： ANDERSSON DAVID ,  JACOBSON KRISTOFER ,  CHRISTIANSSON TOMAS

IPC: G06F3/0354 ,  G06F3/041 ,  G06T11/20

Abstract: A touch sensing apparatus is disclosed comprising a touch surface, anda touch sensor configured to determine a first set of coordinates on the touch surface of an object in contact with the touch surface. The touch sensing apparatus is configured to determine a virtual brush angle associated with the object, determine a movement of the object to a second set of coordinates determine an updated virtual brush angle for the object in dependence on a position of the second set of coordinates relative to the first set of coordinates, and output the second set of coordinates and the updated virtual brush angle. An associated method is also disclosed.

公开(公告)号：CA2778153A1

公开(公告)日：2011-04-28

申请号：CA2778153

申请日：2010-10-13

Applicant: FLATFROG LAB AB

Inventor： CHRISTIANSSON TOMAS

IPC: G06F3/042

Abstract: A touch-sensing apparatus is based on frustrated total internal reflection (FTIR). The apparatus comprises a panel, in which sheets of light are propagated by internal reflection between a touch surface and an opposite surface. A light sensor arrangement is optically connected to the panel to measure transmitted light energy on detection lines across the touch surface. Each detection line represents a light path across the touch surface from a light source to a light sensor. An object that touches the touch surface will frustrate the propagating light and cause a local attenuation among the detection lines. A data processor is connected to the light sensor arrangement and configured to execute a process for extracting touch-related data. In the process, an output vector is generated to contain signal values indicative of light received by the light sensor arrangement on a set of detection lines (step 52), and a two-dimensional attenuation field on the touch surface is represented by one or more two-dimensional basis functions. Each basis function defines an attenuation strength within its two-dimensional extent. The process reconstructs the attenuation field from the output vector (step 54), based on a mapping of the set of detection lines to each basis function. In the reconstruction, an estimated attenuation field is calculated by optimizing at least one of the attenuation strength and the location of each basis function such that the estimated attenuation field yields the output vector. The estimated attenuation field is then processed for extraction of the touch-related data (step 56).

公开(公告)号：CA2772830A1

公开(公告)日：2011-03-10

申请号：CA2772830

申请日：2010-09-01

Applicant: FLATFROG LAB AB

Inventor： CHRISTIANSSON TOMAS ,  WASSVIK OLA

IPC: G06F3/042

Abstract: A touch-sensitive system comprises a light transmissive panel (1) defining a touch surface and an opposite surface; an illumination arrangement (3) comprising emitters (2) configured to introduce light into the panel (1) for propagation in the panel (1) in an emission pattern; a light detection arrangement (5) comprising detectors (4) configured to receive the light propagating in the panel (1). A control unit (6) is arranged to control the operation of the touch-sensitive system. The control unit (6) executes a control method to monitor the light received in the light detecting arrangement (5) for detection of touches on the touch surface, the touches attenuating the light propagating in the panel (1). The control method also selects a mode for the emission pattern in dependence of the occurrence of touches on the touch surface and controls the emission pattern in accordance with the selected mode.

公开(公告)号：CA2728034A1

公开(公告)日：2010-01-21

申请号：CA2728034

申请日：2009-06-22

Applicant: FLATFROG LAB AB

Inventor： WASSVIK OLA ,  CHRISTIANSSON TOMAS

IPC: G06F3/042

Abstract: An apparatus is operated to determine the location of at least one object on a touch surface of a light transmissive panel (1). In the apparatus, an illumination arrangement introduces radiation into the panel (1) for propagation by internal reflection between the touch surface and the opposite surface, so as to generate a grid of intersecting radiation paths in a sensing area, and a detection arrangement measures the transmitted energy in the radiation paths. A data processor (8) then determines, based on the transmitted energy, the location based on an attenuation of two or more radiation paths caused by the object (01) touching the touch surface within the sensing area. In the apparatus, the illumination arrangement generates at least a subset of the radiation paths by sweeping at least one beam (B1, B2) of radiation along the touch surface. The detection arrangement comprises a fixed re-directing device (12A, 12B) which receives and re-directs the beam (B1, B2) onto a common detection point (D1, D2) while the beam (B1, B2) is swept along the touch surface, and a radiation detector (RD1, RD2) which is located at the common detection point (D1, D2) to measure the energy of the beam(s) (B1, B2).

公开(公告)号：AU2009272923A1

公开(公告)日：2010-01-21

申请号：AU2009272923

申请日：2009-06-22

Applicant: FLATFROG LAB AB

Inventor： WASSVIK OLA ,  CHRISTIANSSON TOMAS

IPC: G06F3/042

Abstract: An apparatus is operated to determine the location of at least one object on a touch surface of a light transmissive panel. In the apparatus, an illumination arrangement introduces radiation into the panel for propagation by internal reflection between the touch surface and the opposite surface, so as to generate a grid of intersecting radiation paths in a sensing area, and a detection arrangement measures the transmitted energy in the radiation paths. A data processor then determines, based on the transmitted energy, the location based on an attenuation of two or more radiation paths caused by the object touching the touch surface within the sensing area. In the apparatus, the illumination arrangement generates at least a subset of the radiation paths by sweeping at least one beam of radiation along the touch surface. The detection arrangement comprises a fixed re-directing device which receives and re-directs the beam onto a common detection point while the beam is swept along the touch surface, and a radiation detector which is located at the common detection point to measure the energy of the beam(s).

公开(公告)号：SE535005C2

公开(公告)日：2012-03-13

申请号：SE1050434

申请日：2010-05-03

Applicant: FLATFROG LAB AB

Inventor： CHRISTIANSSON TOMAS ,  JUHLIN PETER

IPC: G06F3/041 ,  G06T11/00

公开(公告)号：CA2798176A1

公开(公告)日：2011-11-10

申请号：CA2798176

申请日：2011-04-28

Applicant: FLATFROG LAB AB

Inventor： CHRISTIANSSON TOMAS ,  JUHLIN PETER

IPC: G06F3/042

Abstract: A touch-sensitive apparatus comprises a panel configured to conduct signals from a plurality of peripheral incoupling points to a plurality of peripheral outcoupling points. Actual detection lines are defined between pairs of incoupling and outcoupling points to extend across a surface portion of the panel. The signals may be in the form of light, and objects touching the surface portion may affect the light via frustrated total internal reflection (FTIR). A signal generator is coupled to the incoupling points to generate the signals, and a signal detector is coupled to the outcoupling points to generate an output signal. A data processor operates on the output signal to enable identification of touching objects. The output signal is processed (40) to generate a set of data samples, which are indicative of detected energy for at least a subset of the actual detection lines. The set of data samples is processed (42) to generate a set of matched samples, which are indicative of estimated detected energy for fictitious detection lines that have a location on the surface portion that matches a standard geometry for tomographic reconstruction. The set of matched samples is processed (44, 46) by tomographic reconstruction to generate data indicative of a distribution of an energy-related parameter within at least part of the surface portion.

公开(公告)号：SE534244C2

公开(公告)日：2011-06-14

申请号：SE0901145

申请日：2009-09-02

Applicant: FLATFROG LAB AB

Inventor： WASSVIK OLA ,  CHRISTIANSSON TOMAS

IPC: G06F3/042

公开(公告)号：SE0802531A1

公开(公告)日：2010-06-06

申请号：SE0802531

申请日：2008-12-05

Applicant: FLATFROG LAB AB

Inventor： FAAHRAEUS CHRISTER ,  WASSVIK OLA ,  CHRISTIANSSON TOMAS ,  WALL HENRIK

IPC: G06F3/042