A crosspiece precursor and a picture element assembly precursor are hardened
at
mutually different timings to form a crosspiece and a picture element assembly.
For example, the crosspiece precursor is firstly hardened to form the crosspiece.
After that, the picture element assembly precursor is hardened while allowing an
upper end surface of the picture element assembly precursor to make pressed contact
with an optical waveguide plate, by displacing an actuator element toward an actuator
substrate. The picture element assembly, which is formed by hardening the picture
element assembly precursor, reliably abuts against the optical waveguide plate
when a display device is in a light emission state.
