Abstract: Microscopic LED dice are printed in groups, to form pixels, on a thin transparent substrate, and the LEDs in each pixel are sandwiched between two transparent conductor layers to connect the LEDs in parallel. This forms a single 2-dimensional pixel layer that is substantially transparent, where the pixels are individually addressable. Multiple pixel layers are stacked with an index-matched spacer layer therebetween to form a 3-dimensional array of pixels. If the 3-D display is formed as a cube, the viewing window may be the top pixel layer. All pixel layers are simultaneously viewable through the viewing window since each layer is transparent. Accordingly, 3-dimensional images may be displayed. In another embodiment, one or more LED pixels layers are folded, like an accordion, to achieve a stereoscopic effect so that the left and right eyes see different images to convey depth.

Abstract: Provided is a system and corresponding methods for a network of indoor modular signs. The indoor signs are composed of various modules which are combined to make the signs fully contained and operable. The modules include paper and e-paper based displays and frames as well as power line communication devices. The invention includes: a network of modular signs within an indoor area, a computing station with prerecorded data, and said data is presented as scheduled on the electronic paper-like display modules and power line communication networks that provide both power and data to the displays.