Patent ID: 8899851

Claim:
A keyboard comprising: a first substrate comprising a first upper surface and a first lower surface; a second substrate located apart from the first substrate and comprising a second upper surface and a second lower surface opposite the second upper surface, and the second upper surface facing the first lower surface; a first electrode layer positioned on the first lower surface and comprising a first conductive layer comprising a carbon nanotube layer structure, a first resistivity of the carbon nanotube layer structure along a first direction is larger than a second resistivity of the carbon nanotube layer structure along a second direction that is substantially perpendicular with the first direction; a first electrode positioned on one end of the carbon nanotube layer structure and oriented along the first direction; a plurality of detecting electrodes positioned on another end of the carbon nanotube layer structure and arranged along the first direction; a second electrode layer positioned on the second upper surface and comprising a second conductive layer; and a plurality of rows of keys positioned on the first upper surface, each of the plurality of rows is aligned along the second direction, and an amount of the plurality of detecting electrodes is larger than an amount of the plurality of rows, wherein each key is detectable by at least one detecting electrode.