Study of Textile Input Interface Design and Operability by Using Capacitance Sensing

This study proposes a fabric-type input device that provides mobility by using a weighted value based on the movement velocity between 16 individual capacitors composed of conductive textile. In addition, the proposed device measures the rate of change of dielectric permittivity based on pressure or touch and provides the function like a mouse. A capacitor is composed of a conductive material ($37m{\Omega}/sq$), where a coating of copper and nickel is applied to polyester, and the area of the capacitor is $10mm(W){\times}10mm(L)$. The lower layer is composed of non-conductive fabric having a thickness of 1.36 mm, and the interval between each capacitor is 8 mm with four columns and four rows. Before touch, the capacitance was 120 pF and after touch, the capacitance increased up to 820 pF. In a monitor having a resolution of $1920{\times}1080$, it was observed that the average mobility of a mouse was 60.89 mm and the standard deviation was 0.92 mm, while for a fabric interface, the average mobility was 965.77 mm and the standard deviation was 7.37 mm.

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