Multi-touch optical device based on patterned design and algorithm matrix

The optical device of multi-touch based on an algorithm matrix and patterned design was investigated. The algorithm matrix for array scanning is derived using voltage divider rule with two configurations of equivalent circuits. The virtual high and low impedances are used for patterned design. The microelectromechanical systems technologies are carried out for fabrication process of multi-touch panel. The multi-touch panel with a array of 30 × 30 has a pitch distance of 2 mm and a pixel size of 2 × 2 mm². The maximum transmittance is about 74.2% at the wavelength of 692 nm. The average values of high and low impedances are 53.23 k ohm and 9.3 k ohm, respectively.