Methods for welding sandwich structures together, especially vehicle structures, where the structures include two opposing face sheets with a core, such as a micro-truss core, therebetween. In the electro-optical display according to the present invention, a plurality of pixels included in a pixel portion have a first and a second source signal lines, a first and a second gate signal lines, and a power source supply line. When the stylus is removed from the receiving slot, a switch automatically turns full power onto the computer system thereby allowing a user full use of the computer without requiring an onoff button to be pressed. In an example embodiment, the plurality of openings includes at least one row of openings substantially aligned in an X direction, orthogonal to the Y direction.