Electroluminescent film or wire LCD

Electroluminescent wire (EL wire) is a thin copper wire coated in a phosphor which glows brightly when a current is applied to it.

inside el wire
Inside EL Wire
Creative Commons

EL glow wire or electroluminescent wire is a portable light source that works to provide a bright, colourful glow that looks just like neon. EL glow wire can light up outfits for an evening out, fancy dress costumes. Multi use EL glow wire can also be used for health and safety by dressing up a bicycle, or wearing it when running or cycling in low light.

el wire costumes
EL Wire Costumes

The thin diameter makes it very flexible and ideal for use in a variety of applications such as clothing or costumes.