There is provided an EL light-emitting device with less uneven brightness. When a drain current of a plurality of current controlling TFTs is Id, a mobility is μ, a gate capacitance per unit area is Co, a maximum gate voltage is Vgs(max), a channel width is W, a channel length is L, an average value...http://www.google.fr/patents/US7129917?utm_source=gb-gplus-shareBrevet US7129917 - Light-emitting device
