Patent ID: 8692800

Claim:
A coordinate detection apparatus, comprising: a plurality of electrode arrays each including a first electrode extending in a first direction and including a first region that is gradually larger in dimension, with respect to the first direction, in parallel with a second direction orthogonal to the first direction, and a second region that is gradually smaller in dimension, with respect to the first direction, in parallel with the second direction, a second electrode that extends in the first direction, is opposed to the first region in the second direction, and is gradually smaller in dimension, with respect to the first direction, in parallel with the second direction, and a third electrode that extends in the first direction, is opposed to the second region in the second direction, and is gradually larger in dimension, with respect to the first direction, in parallel with the second direction, the plurality of electrode arrays each including a group of the first electrode, the second electrode, and the third electrode that are arranged in the second direction and being configured to have a capacitance varied depending on proximity of a detection target; and a processing unit configured to calculate a first value being a total sum of capacitance values of the first electrodes of the plurality of electrode arrays, a second value being a total sum of capacitance values of the second electrodes of the plurality of electrode arrays, a third value being a total sum of capacitance values of the third electrodes of the plurality of electrode arrays, and a fourth value being a sum of the first value, the second value, and the third value, detect, when the second value is larger than the third value, a first position coordinate in accordance with a first capacitance ratio being a ratio of a difference between the first value and the second value to the fourth value, and detect, when the second value is smaller than the third value, the first position coordinate in accordance with a second capacitance ratio being a ratio of a difference between the third value and the first value to the fourth value.