Ceramic element, method for producing ceramic element, display device, relay device, and capacitor

A display device comprising an optical waveguide plate for introducing light thereinto, and a driving unit provided opposingly to one plate surface of said optical waveguide plate and including a number of actuator elements arranged corresponding to a large number of picture elements, for displaying, on said optical waveguide plate, a picture image corresponding to an image signal by controlling leakage light at a predetermined portion of said optical waveguide plate by controlling displacement action of each of said actuator elements in a direction to make contact or separation with respect to said optical waveguide plate in accordance with an attribute of said image signal to be inputted, wherein said actuator element comprises:

• a main actuator element having an anti-ferroelectric film and at least a pair of electrodes formed on said anti-ferroelectric film;
• a vibrating section for supporting said main actuator element;
• and
• a fixed section for vibratingly supporting said vibrating section;
• said display device further comprising a displacement-transmitting section for transmitting, to said optical waveguide plate, said displacement action of said actuator element generated by applying a voltage to said pair of electrodes.