Patent application number | Description | Published |
20120068973 | Determining The Location Of An Object On A Touch Surface - An apparatus is operated to determine the location of at least one object on a touch surface ( | 03-22-2012 |
20120162142 | TOUCH-SENSITIVE SYSTEM AND METHOD FOR CONTROLLING THE OPERATION THEREOF - A touch-sensitive system comprises a light transmissive panel defining a touch surface and an opposite surface; an illumination arrangement comprising emitters configured to introduce light into the panel for propagation in the panel in an emission pattern; a light detection arrangement comprising detectors configured to receive the light propagating in the panel. A control unit is arranged to control the operation of the touch-sensitive system. The control unit executes a control method to monitor the light received in the light detecting arrangement for detection of touches on the touch surface, the touches attenuating the light propagating in the panel. 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. | 06-28-2012 |
20120162144 | Touch Surface With A Compensated Signal Profile - An apparatus, method and computer-readable medium for determining a location of at least one object on a touch surface of a light transmissive panel. The method comprises the steps of: introducing light into the panel for propagation by internal reflection between the touch surface and an opposite surface; receiving the light propagating in the panel; and iteratively i) determining a current signal profile of light received by the light detection arrangement, ii) updating, when a condition is met, a background signal profile of light received by the light detection arrangement, iii) calculating a current compensated signal profile as a function of the background signal profile and the current signal profile and iv) determining, when the object touches the touch surface and thereby attenuates the light propagating in the panel, the location as a function of the compensated signal profile. | 06-28-2012 |
20120200538 | TOUCH SURFACE WITH TWO-DIMENSIONAL COMPENSATION - An apparatus for determining an interaction between an object and a touch surface of a panel. An illumination arrangement introduces light into the panel for propagation by internal reflection between the touch surface and an opposite surface and towards a receiving light detection arrangement. A processor unit is configured to iteratively i) determine, based on the received light, a current light status representing a two-dimensional distribution of light in the panel, ii) determine the interaction with the object as a function of the current light status and a previously updated background status representing a two-dimensional distribution of light in the panel caused by contaminations, and iii) update the background status as a function of the interaction. A method and computer readable medium are also described. | 08-09-2012 |
20120256882 | TOUCH SURFACE WITH IDENTIFICATION OF REDUCED PERFORMANCE - A device is configured to process data from a touch-sensitive apparatus for the purpose of identifying a reduced performance of components in the apparatus. The apparatus may be an FTIR system that comprises a light transmissive panel, an illumination arrangement for introducing light into the panel, and a light detection arrangement for receiving the light propagating in the panel and for measuring the energy of the received light. The device comprises a processor unit which is configured to obtain a signal comprising a time series of signal values that represent the energy of the light received by the light detection arrangement; calculate a parameter value representing a temporal variability of the signal values in the signal; and identify, based on the parameter value, a reduced performance of any of the illumination arrangement and the light detection arrangement. The temporal variability may be calculated to represent one of an absolute noise level and a signal-to-noise ratio of the signal, and enables the reduced performance to be identified while objects touch the light transmissive panel. | 10-11-2012 |
20130021300 | TOUCH-SENSING DISPLAY APPARATUS AND ELECTRONIC DEVICE THEREWITH - A touch-sensing display apparatus comprises a display unit with integrated elements, and a planar light guide located in front of the display unit so as to define a touch surface. At least one light emitter is arranged to emit light into the light guide for propagation by total internal reflection inside the light guide, and at least one light detector is arranged to receive at least part of the light propagating inside the light guide. The integrated elements are designed as image-forming elements and touch-sensor elements, wherein the touch-sensor elements comprise the emitter(s) and/or the detector(s) and are arranged along a periphery region of the display unit. The image-forming elements and the touch-sensor elements may be integrated in one and the same composite substrate within the display unit. | 01-24-2013 |
20130127790 | TOUCH-SENSING DISPLAY PANEL - A touch-sensing display panel, comprising a plurality of image-forming pixel elements; a planar light guide with a first refractive index, having a front surface forming a touch-sensing region and an opposite rear surface facing the pixel elements; a plurality of light emitters arranged at a peripheral region of the panel to emit light into the light guide for propagation therein through total internal reflection; a plurality of light detectors disposed at the peripheral region for receiving light from the light guide; and an optical layer disposed at the rear surface of the light guide to cover a plurality of the image-forming pixel elements in at least a central region of the panel, wherein said optical layer is configured to reflect at least a part of the light from the emitters impinging thereon from within the light guide. | 05-23-2013 |
20130154983 | DATA PROCESSING IN RELATION TO A MULTI-TOUCH SENSING APPARATUS - A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining ( | 06-20-2013 |
20140085241 | DEVICE AND METHOD FOR DETERMINING REDUCED PERFORMANCE OF A TOUCH SENSITIVE APPARATUS - A device for processing data from a touch sensitive apparatus is provided. The apparatus includes a light transmitting panel with a touch surface and an opposed back surface, an illumination arrangement configured to introduce light into the panel for propagation by internal reflection between the touch surface and the back surface, and a light detection arrangement configured to receive the light after propagation in the panel. A processor unit in the device obtains a monitored signal which is functionally dependent on transmitted light detected by the light detection arrangement; reconstructs, based on the monitored signal, a two-dimensional attenuation field representing an attenuation of the transmitted light on the touch surface; calculates an expected monitored signal based on the reconstructed attenuation field; and compares the expected monitored signal with the monitored signal in order to determine a reduced performance of the apparatus. | 03-27-2014 |
20140125633 | TOUCH SENSING APPARATUS AND METHOD OF OPERATING THE SAME - A touch sensing apparatus includes a group of emitters arranged to emit light to illuminate at least part of the touch surface, a light detector arranged to receive light from the group of emitters, and a processing element. Each emitter is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter. 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. The processing element processes an output signal from the light detector to separate the light received from the individual emitters based on the transmitted codes, and to determine the position of the object/objects based on the light received from the individual emitters. | 05-08-2014 |