| 摘要 |
An optical touchpad system that includes a waveguide having a plurality of waveguide layers. For example, the waveguide may include an intervening layer, a signal layer, and/or other layers. The intervening layer may be defined by a first surface, a second surface and a substantially transparent material having a first index of refraction disposed between the first and the second surface of the interface layer. The signal layer may be defined by a first surface, a second surface and a substantially transparent material having a second index of refraction that is greater than the first index of refraction.
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