DEVICE AND METHOD FOR DETERMINING REDUCED PERFORMANCE OF A TOUCH SENSITIVE APPARATUS
First Claim
1. A device for processing data from a touch sensitive apparatus, which apparatus comprises:
- a light transmitting panel, which is defined by a touch surface on one side and by an opposed back surface on the opposite side;
an illumination arrangement configured to introduce light into the panel for propagation by internal reflection between the touch surface and the back surface;
a light detection arrangement configured to receive the light after propagation in the panel, wherein the device comprises a processor unit configured to;
obtain a monitored signal which is functionally dependent on transmitted light detected by the light detection arrangement,reconstruct, based on the monitored signal, a two-dimensional attenuation field representing an attenuation of the transmitted light on the touch surface,calculate an expected monitored signal based on the reconstructed attenuation field, andcompare the expected monitored signal with the monitored signal in order to determine a reduced performance of the apparatus.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
-
Citations
20 Claims
-
1. A device for processing data from a touch sensitive apparatus, which apparatus comprises:
- a light transmitting panel, which is defined by a touch surface on one side and by an opposed back surface on the opposite side;
an illumination arrangement configured to introduce light into the panel for propagation by internal reflection between the touch surface and the back surface;
a light detection arrangement configured to receive the light after propagation in the panel, wherein the device comprises a processor unit configured to;obtain a monitored signal which is functionally dependent on transmitted light detected by the light detection arrangement, reconstruct, based on the monitored signal, a two-dimensional attenuation field representing an attenuation of the transmitted light on the touch surface, calculate an expected monitored signal based on the reconstructed attenuation field, and compare the expected monitored signal with the monitored signal in order to determine a reduced performance of the apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- a light transmitting panel, which is defined by a touch surface on one side and by an opposed back surface on the opposite side;
-
18. A method of identifying a reduced performance in a touch sensitive apparatus, the method comprising the steps of:
-
introducing light into a panel of said touch sensitive apparatus in order to detect touch data for one or more objects in contact with said panel, detecting the light as it has passed through the panel and obtaining a monitored signal as a function of the energy of the detected light, reconstructing, based on the monitored signal, a two-dimensional attenuation field that represents an attenuation of the transmitted light on the touch surface, calculating an expected monitored signal based on the reconstructed attenuation field, and comparing the expected monitored signal with the monitored signal in order to determine a reduced performance of the touch sensitive apparatus. - View Dependent Claims (20)
-
-
19. A method of processing data from a touch sensitive apparatus, which apparatus comprises:
- a light transmitting panel, which is defined by a touch surface on one side and by an opposed back surface on the opposite side;
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 detect the light after propagation in the panel, wherein the method comprises;obtaining a monitored signal as a function of the energy of the light detected by the light detection arrangement, reconstructing, based on the monitored signal, a two-dimensional attenuation field representing an attenuation of the transmitted light on the touch surface, calculating an expected monitored signal based on the reconstructed attenuation field, and comparing the expected monitored signal with the monitored signal in order to determine a reduced performance of the touch sensitive apparatus.
- a light transmitting panel, which is defined by a touch surface on one side and by an opposed back surface on the opposite side;
Specification