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Capacitive tactile sensor array for touch screen application

2010; Elsevier BV; Volume: 165; Issue: 1 Linguagem: Inglês

10.1016/j.sna.2009.12.031

1873-3069

Hongki Kim, Seunggun Lee, Kwang‐Seok Yun,

Advanced Sensor and Energy Harvesting Materials

In this paper, we propose and demonstrate a transparent and flexible capacitive tactile sensor which is designed for multi-touch screen application with force sensing. A sensor module is composed of 2D array tactile cells with a spatial resolution of 2 mm to measure the touch force at multiple positions. The device is fabricated by using transparent materials on a transparent plastic substrate. The optical transmittance of the fabricated tactile sensor is approximately 86% in the visible wavelength region, and the maximum bending radius is approximately 30 mm. The cell size is 1 mm × 1 mm, and the initial capacitance of each cell is approximately 900 fF. The tactile response of a cell is measured with a commercial force gauge having a resolution of 1 mN. The sensitivity of a cell is 4%/mN within the full scale range of 0.3 N.