Display device

A display device including an optical waveguide plate for introducing light thereinto, and a driving unit disposed opposingly to one plate surface of said optical waveguide plate and arranged with actuator elements of a number corresponding to a large number of picture elements, for displaying a picture on said optical waveguide plate in accordance with an image signal by controlling displacement movement 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 so that leakage light is controlled at a predetermined position on said optical waveguide plate, each of said actuator elements comprising:

• a main actuator element including a piezoelectric/electrostrictive layer, and a pair of electrodes formed on a first principal surface of said piezoelectric/electrostrictive layer;
• a vibrating section contacting with a second principal surface of said piezoelectric/electrostrictive layer, for supporting said main actuator element;
• a fixed section for supporting said vibrating section in a vibrative manner;
• and
• a displacement-transmitting section for transmitting, to said optical waveguide plate, said displacement movement of said actuator element caused by applying a voltage between said pair of electrodes.