Elan Microelectronics Corporation

Hung Nien

Chia-Hsing Lin

Yi-Hsin Tao

Hsin-Shieh Tsai

Chun-Chung Huang

Hsuan-Wen Tseng

Brian Sung

Chih-Hsien Teng

Methods are proposed for object positioning for an X-Y projected capacitive touch panel. In an embodiment, capacitance sensing under inphase excitation of traces is applied to set a base value when the capacitive touch panel is not touched and to obtain capacitances at intersections when the capacitive touch panel is touched, and the base value is compared with the measured capacitances to identify touch points. In other embodiments, X-Y projected sensing and all-point sensing are combined to reduce the amount of calculation and achieve the same positioning effect as an all-point capacitive touch panel.

Object positioning for an X-Y projected capacitive touch panel

A capacitive touch panel has a plurality of traces including a boundary trace, and a virtual trace is defined outward of the boundary trace and assigned with a virtual coordinate and a virtual capacitance for interpolation to position a touch point around the boundary of the capacitive touch panel, thereby eliminating the non-addressable region of the capacitive touch panel.

Boundary resolution improvement for a capacitive touch panel

Growing community of inventors

Hsinchu, Taiwan

Hung Nien