Operating touch screens by applying more than one voltage modes, including a first voltage mode corresponding to a display phase and a second voltage mode corresponding to a touch sensing phase, is provided. The noncircular cross-section of the melt channel portion may be, for e. A rotary encoder is provided for detecting the pivot angle of the support arm relative to the chassis as a degree of an adjustment position of the mast. Adjacent stacked packages have complementary asymmetrical arrangements of the die, and one package is inverted with respect to the other in the stack, such that the two die are situated side-by-side in the space between the two substrates. The method further includes forming a channel material on the substrate in the first trench and in the second trench.