The present invention provides a pixel array and a process flow for forming an array of pixel cells that features pixel electrodes having overlapping edges. The port comprises a cap in its front end which axially extends into an essentially sleeve formed part provided with said penetrable membrane which is scaled from contamination by said cap and furthermore it is provided with means to expose said penetrable membrane when it is desired to establish fluid communication with the container. The power monitor device is disposed between a power supply end and a power user end. In subsequent steps, selected ones of the array of square holes can be filled in with a conductive material to form vias and selected others of the square holes can be filled in with an insulating material so as to avoid the formation of unintended vias or conducting paths. A voice application server determines which portions of a voice advertisement will be cached locally at the voice advertising portal for subsequent local retrieval during user interaction with the voice advertising portal.