Development of a flexible touch pad

The enhancement of the resolution of touch of a flexible touch pad will lead to connection of more external wires,resulting in signal disturbance and flexibility reduction.For solving these problems,a flexible touch pad is developed based on the working principle of 4-wire resistive touch screen and made of conductive carbon films.The testing results show that the linearity of the touch pad in X and Y directions are ±1.316% and ±0.796%,respectively,under a flattened placement.Within the working area of 100 mm×100 mm,the resolution reaches as high as 380 dpi×628 dpi.The touch pad can give a quick response when an applied touch force is 0.5~0.7 N.Under small strains of bending and tension,no significant influence on its positioning accuracy is observed.Therefore,it is an ideal flexible sensor for positioning.