A display device comprises an actuator substrate which has actuator elements, an optical waveguide plate, crosspieces which is interposed between the optical waveguide plate and the actuator substrate and which surround the actuator elements, and picture element assemblies which are joined onto the actuator elements. A stack for constructing each of the picture element assemblies has a transparent layer opposed to the optical waveguide plate. The transparent layer contains a major component of a cured resin obtained by polymerization with a principal ingredient which is composed of one or more materials selected from modified epoxy, bisphenol A type epoxy, bisphenol F type epoxy, and glycidyl ether type epoxy, and a curing agent which is composed of one or more materials selected from modified polyamine, modified alicyclic polyamine, and heterocyclic diamine modified product of tertiary amine.