Patent ID: 7605535

Claim:
An electroluminescent device comprising: a substrate; pixels over the substrate, the pixel including a first color pixel which emits a first color light and a second color pixel which emits a second color light, the pixels including a common electrode, each of the first color pixel and the second color pixel including a light transmitting pixel electrode and a light-emitting layer between the common electrode and the corresponding light transmitting pixel electrode; an insulator laminated film to a side of the light transmitting pixel electrodes that is opposite from a side at which the light-emitting layers are disposed, the insulator laminated film having a plurality of low refractive-index layers each formed of a light transmitting insulator and a plurality of high refractive-index layers each formed of a light transmitting insulator having a refractive index higher than the refractive-index of the light transmitting insulator of the low refractive-index layers, one of the low refractive-index layers being interposed between two of the high refractive-index layers, each low refractive-index layer is formed over the entire luminescent region of the first color pixel and the second color pixel and has a substantially constant thickness in regions which overlap the first color pixel and the second color pixel, each high refractive-index layer is formed over the entire luminescent region of the first color pixel and the second pixel and has a substantially constant thickness in regions which overlap the first color pixel and the second color pixel, the plurality of the low refractive-index layers have thicknesses that are different from each other, the plurality of the high refractive-index layers have thicknesses that are different from each other, and the thicknesses of the low refractive-index layers and the high refractive-index layers are determined such that, light emitted from the light-emitting layer that passes through the substrate has an intensity in a luminescence peak wavelength of any one of the first color pixel and the second color pixel that is higher than that of the case of not having the insulator laminated film by reflection at, at least, interfaces between the light transmitting pixel electrodes and the insulator laminated film and interfaces between the low refractive-index layers and the high refractive-index layers.