Patent ID: 7902750

Claim:
An electro-optical device, comprising: a substrate having a plurality of pixel electrodes thereon; a bank structure formed on the substrate and provided with a plurality of pixel apertures corresponding to the plurality of pixel electrodes; an injection layer formed in each of the plurality of pixel apertures for injecting electrons or holes; an organic semiconductor layer formed on the injection layer in each of the plurality of pixel apertures; and an electrode formed on the organic semiconductor layer, wherein the bank structure includes a lyophilic layer formed on the substrate and a lyophobic layer formed on the lyophilic layer, wherein each of the plurality of pixel apertures is formed so as to penetrate the lyophilic layer and the lyophobic layer, and comprises a first aperture in the lyophilic layer and a second aperture in the lyophobic layer corresponding to the first aperture in the lyophilic layer, wherein the first and corresponding second apertures are cylindrical with a same diameter and a same central axis as each other, such that in each of the plurality of pixel apertures, an inner circumferential surface of the lyophilic layer and an inner circumferential surface of the lyophobic layer are in a same plane, the lyophobic layer has relatively weak affinity for a material solution used for forming the injection layer in comparison with the lyophilic layer and includes a plurality of lyophobic portions corresponding to the plurality of pixel apertures, and the plurality of lyophobic portions are provided so as to be separate from each other such that each of the lyophobic portions is separate from lyophobic portions corresponding to apertures of adjacent pixels, and each of the plurality of the lyophobic portions surrounds the corresponding pixel aperture of the plurality of pixel apertures.