Abstract: The present invention relates to an augmented reality system for use in an on-site construction process. The augmented reality system includes a plurality of mobile devices, each of which is operable by an authorized user, includes a private information accessible to the authorized user and has a tangible touch-display screen for showing the private information; and a central processing station electrically connected with each of the plurality of mobile devices, including a public information accessible to all of the authorized users and having a tangible touch-display interface for showing the public information, wherein when the private information included in one of the plurality of mobile devices and accessible to the authorized user is transmitted to the central processing station, it is regarded as the public information and accessible to all of the authorized users.

Abstract: The present invention relates to an augmented reality system for use in an on-site construction process. The augmented reality system includes a plurality of mobile devices, each of which is operable by an authorized user, includes a private information accessible to the authorized user and has a tangible touch-display screen for showing the private information; and a central processing station electrically connected with each of the plurality of mobile devices, including a public information accessible to all of the authorized users and having a tangible touch-display interface for showing the public information, wherein when the private information included in one of the plurality of mobile devices and accessible to the authorized user is transmitted to the central processing station, it is regarded as the public information and accessible to all of the authorized users.

Abstract: An arrangement wherein a plurality of LED strings are driven with a balanced drive signal, i.e. a drive signal wherein the positive side and negative side are of equal energy over time, is provided. In a preferred embodiment, the drive signal is balanced responsive to a capacitor provided between a switching network and a driving transformer. Balance of current between various LED strings is provided by a balancing transformer.