I found some info about this new technology for fabric, from Daily Tech:

Lumalive fabrics incorporate arrays of LED pixels mounted on a flexible lightweight substrate, with each pixel containing closely spaced red, green and blue LEDs. Electric conducting tracks on the plastic substrate connect these pixels into a matrix display configuration, allowing each pixel to be individually addressed and the light intensity of its three LEDs varied in order to produce any desired color. Standard Lumalive panels measure 20 cm square and contain an array of 14 x 14 pixels, spaced a little over one centimeter apart. The panels can be interlinked or scaled up to cover large areas.

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