Light emitting device

A light-emitting device includes a substrate and a first sub-pixel. The first sub-pixel has a first transparent area and a first non-transparent area, and includes a switching element, a dielectric layer, an organic light emitting diode, and an encapsulation layer. The switching element is located on the substrate and in the first non-transparent area. The dielectric layer is located on the switching element. The organic light emitting diode is located on the dielectric layer and is electrically connected to the switching element. The encapsulation layer includes a first insulating layer, a second insulating layer, and a third insulating layer stacked in sequence. The first insulating layer is closer to the organic light emitting diode than the third insulating layer. The refractive index of the third insulating layer is smaller than the refractive index of the second insulating layer. The refractive index of the second insulating layer is smaller than the refractive index of the first insulating layer.