公开(公告)号：US10156901B2

公开(公告)日：2018-12-18

申请号：US14885490

申请日：2015-10-16

Applicant: Wisconsin Alumni Research Foundation

Inventor： Xinyu Zhang ,  Chi Zhang ,  Joshua Tabor ,  Jialiang Zhang

IPC: G06F3/01 ,  G06F3/041 ,  G06F3/042 ,  G06F3/0354

Abstract: A virtual touchscreen for mobile devices provides a touchscreen area displaced to a side of the display to eliminate problems of a finger blocking the display during normal touchscreen operation. The virtual touchscreen may be monitored by a sensor system looking edgewise from a housing of the mobile device employing as few as two displaced photodetectors and a correspondingly oriented light source constrained to sensitivity within a narrow fan-shaped light-sensing plane. Extraction of the spatial location of a finger touch within this touchscreen area may be performed by a model of reflected light signals of a finger in different locations calibrated to environmental parameters of finger reflectivity and background reflectivity by a simple calibration process.