Near-field optical sensing system

摘要

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for sensing touch and/or gestures in the near-field area overlying a light-guiding layer within a device or other optical sensing system. In one aspect, modulated infrared light is emitted into the overlying area, and the light reflected by objects within the overlying area is redirected through the light-guiding layer to infrared sensors. In one aspect, a masking structure can be located between the light-guiding layer and the infrared sensors. In some aspects, probability mapping or backtracing can be used to estimate the locations of objects within the overlying area.

主权项

1. An optical sensing system, comprising:
a light guiding layer having a first surface, a second surface, and one or more edges; an infrared (IR) light source configured to direct light into an area overlying the first surface of the light guiding layer; a plurality of light-turning structures configured to redirect light passing through the first surface of the light guiding layer into the light-guiding layer; a plurality of IR sensors adjacent at least one edge of the light-guiding layer; and a plurality of masking structures disposed between the light-guiding layer and the plurality of IR sensors.