| 主权项 |
1. A touch screen system for sensing a touch event, comprising:
a cover screen having an upper surface, a lower surface and a perimeter; a support frame having a central aperture and stood off from the cover screen by at least one resilient stand-off member; a photodetector disposed adjacent the lower surface of and external to the cover screen, wherein the photodetector and the lower surface of the cover screen are separated by a distance δz and define a Fabry-Perot cavity that resides outside of the cover screen and that has a transmission defined by the distance δz; a light source that emits light and that is in optical communication with the photodetector via reflection off of a portion of the cover screen lower surface adjacent the perimeter and without the light or the reflected light traveling through or above the cover screen, such that when the cover screen a is displaced toward the support frame by compressing the at least one stand-off member, the amount of reflected light detected by the photodetector changes; and wherein the transmission of the Fabry-Perot cavity changes by changing the distance δz when the cover screen is displaced towards or away from the photodetector, thereby causing the change in the amount of light detected by the photodetector, wherein each light source and photodetector defines a sensor head, wherein the system includes multiple sensor heads operably arranged adjacent the cover sheet screen perimeter and adjacent the lower surface, with the multiple sensor heads operably connected to a microcontroller, wherein the signal output from the multiple sensor heads is exported to a computer and used to determine the position and associated force of the touch event, further comprising a capacitive or resistive based system to determine the position of two or more simultaneous touch events, wherein the signal output from the multiple sensor heads is exported to a computer and used to determine the associated force of the two or more simultaneous touch events. |
