Glasses-type augmented reality apparatus and system with compact dimensions

An augmented reality apparatus configured to receive, from an outside of the augmented reality apparatus, a digital holographic image that is viewable only by a wearer and provide the wearer with a digital holographic image incident as a holographic image, the apparatus comprising only:

• an optical configuration which the wearer wears;
• and
• a plurality of holographic optical elements (HOEs) arranged in a form of concentric circles having different radii inside the optical configuration to diffract the incident digital holographic image and provide the diffracted digital holographic image to the wearer such that the digital holographic image is recognized as an augmented reality image,
• wherein each of the holographic optical elements has an angular diameter that is less than 1/180°.

An augmented reality system which enables a wearer to watch a holographic image, the system comprising:

• a projector which outputs a digital holographic image (computer generated holography (CGH)) that is viewable only by the wearer wearing an augmented reality apparatus to an arbitrary space;
• and
• the augmented reality apparatus including only a plurality of holographic optical elements (HOEs) arranged in a form of concentric circles having different radii inside an optical configuration worn by the wearer to diffract an incident digital holographic image and provide the diffracted digital holographic image to the wearer such that the digital holographic image is recognized as an augmented reality image,
• wherein each of the holographic optical elements has an angular diameter that is less than 1/180°.