Fig. 2: Touchless interaction based on EMRT-enabled magnetoreceptor.
a A photograph of the transparent magnetoreceptor applied to the computer monitor and used for human-machine interaction, in this case handwriting input of a word “Hello” (see also Supplementary Movie 2). b A set of reconstructed frames from the input of letter “H” depicted in Supplementary Movie 2. c A photograph of resulting letter “H” handwritten using EMRT-enabled magnetoreceptor. d Variation of the EMRT signal amplitude in an interaction with a magnetic source. e x, y plot of the reconstructed trajectory of a magnetic source moving over the magnetoreceptor while handwriting the letter “H”. The solid lines in panels (d) and (e) depict the full recorded data set and symbols indicate values for the selected frames in the panel (b). f The magnitude of EMRT signal with increasing the distance between the magnetic stylus tip and the magnetoreceptor plane. g Variation of reconstructed position of the magnetic stylus (x0 and y0 coordinates) with increasing distance between the magnetic stylus tip and the magnetoreceptor plane. The symbols and error bars in the panels (f) and (g) denote the mean value and standard deviation of the EMRT signal amplitude and reconstructed (x,y) position over 30 recorded frames. At distances above 15 mm the EMRT algorithm is not able to reliably localize magnetic input due to weak GMR response (below some percent). h Comparison of energy consumption scaling with increasing interactive area between different active transistor matrices and our EMRT platform. The energy consumption of the active matrix-based devices is estimated relying on the reported operating parameters of individual sensing element provided in reports: red30, blue53, green54 and purple55 (Supplementary Note 1). i Temperature of the magnetoreceptor powered with 2 mA current. Inset images are taken with a thermal infrared camera in the beginning and the end of the measurement. The colorcode corresponds to the temperature distribution over the sample area.
