FLATIR

Ramon Hofer, Daniel Naeff, Andreas Kunz
2009 Proceedings of the 3rd International Conference on Tangible and Embedded Interaction - TEI '09  
Figure 1 : From left to right: Detecting touch by interpolating between triggered sensor values; Detection of multiple touch points by grouping sensor values; 4x8 sensor array, In-coupling FTIR infrared diode frame. ABSTRACT In this paper, we suggest a new way to add multi-touch capabilities to an LC-screen. For this, FTIR and IR-sensing behind the LC-screen will be combined. Using a large infrared sensor array mounted behind the LC-matrix, infrared light in front of the screen, which is strong
more » ... enough to pass through the LCscreen's components, can be detected The FTIR-technology is able to deliver such infrared light to the integrated sensors when touching the screen with the fingers. For the prototype, the key parameters of the FTIR principle were experimentally analyzed to optimize the sensor reactivity. The 4x8 sensor prototype can simultaneously detect multiple touches with an accuracy of around 1 mm and with an update rate of 200 Hz.
doi:10.1145/1517664.1517730 dblp:conf/tei/HoferNK09 fatcat:of4gfnrgh5cxhcfyyd565pr4v4