An implantable article for cartilage repair by implantation in an animal. The fastening mechanism includes a post, a latching element, at least a plunger assembly, and an operating element. The devices of the present invention employ three emissive sub-elements, typically emitting red, green and blue, to sufficiently cover the visible spectrum. The thin film transistor is electrically connected to the signal lines and disposed at the unit pixel. The attached assembly for a seed planting unit works in combination with a seed trench opener to form a trench for the deposit of liquid fertilizer offset from and parallel to the later formed seed trench.