Design of Cell-Patterns for Large-Sized Window Unified Touch Screen Panels with High Sensitivity

초록

We examined the effect of cell-pattern shapes on the touch sensitivity of large-sized window-unified capacitive-type touch screen panels. We constructed 3 x 3 touch cell structures with a 1 mu m-thick transparent electrode, 1.5 mu m-thick insulator and a 1 mu m-thick metal bridge, and analyzed the capacitance changes on the pattern shape, dummy area and bridge width by using Q3D extractor. In order to increase the capacitance change, we investigated three types of cell patterns (cross-polygon, cross-bar, cross-square), which showed a capacitance change of 3.3% in the cross-polygon pattern, 5.2% in the cross-bar one, and 5.5% in the cross-square one, respectively. After modifying the dummy patterns, the cross-square pattern had the high capacitance change of 19.2%, as compared with that of 5.8% in the typical diamond pattern. Finally, we fabricated a 24 inch capacitive-type G2 TSP with a less than 1 mm accuracy and a five multi-touch performance maintaining high sensitivity.

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