Near-eye display (NED) system and method using flexible reflector

A device, comprising:

• a waveguide configured to output a first light having a first polarization to a first side of the waveguide and a second light having the first polarization to a second side of the waveguide;
• an optical element assembly disposed at the first side of the waveguide and configured to convert the first light having the first polarization into a third light having a second polarization, and output the third light toward the waveguide;
• and
• a polarizer disposed at the second side of the waveguide and configured to transmit the third light having the second polarization, and block the second light having the first polarization,
• wherein the optical element assembly comprises a reflector, and a phase-modulator disposed between the waveguide and the reflector, and
• wherein the reflector is configured to provide an optical power that is variable.