Diffraction optical component, wearable displaying device, and fabrication method thereof

A wearable displaying device, comprising:

• a micro display for generating imaging light;
• and
• a diffraction optical component, comprising:
• a light guide plate, comprising a first area, a second area, and a third area arranged on a surface thereof along a first direction in sequence;
• a first polarization volume grating (PVG) layer, formed on the first area;
• a second PVG layer, formed on the second area;
• and
• a third PVG layer, formed on the third area,
• wherein the imaging light enters the light guide plate through the first PVG layer, is diffracted by the second PVG layer, and then projected outward through the third PVG layer;
• and a thickness of the first PVG layer is greater than that of the second PVG layer, and is also greater than that of the third PVG layer.

A fabrication method of a diffraction optical component, comprising:

• providing a light guide plate, and defining a first area, a second area, and a third area arranged on a surface thereof along a first direction in sequence;
• forming a first polarization volume grating (PVG) layer on the first area;
• forming a second PVG layer on the second area;
• and
• forming a third PVG layer on the third area, wherein
• a thickness of the first PVG layer is greater than that of the second PVG layer, and is also greater than that of the third PVG layer.