Accommodation-Free Head Mounted Display with Comfortable 3D Perception and an Enlarged Eye-box

Area of Science:

• Optics and Photonics
• Human-Computer Interaction
• Augmented Reality Displays

Background:

• Accommodation-free displays (Maxwellian displays) offer sharp images but have limited eye-box and field of view (FOV).
• Conventional head-mounted displays (HMDs) can cause discomfort and eye strain due to vergence-accommodation conflict (VAC).

Purpose of the Study:

• To present a high-quality accommodation-free head-mounted display (aHMD) for direct retinal image projection.
• To overcome limitations of existing displays by enlarging the eye-box and FOV.
• To provide comfortable and realistic 3D augmented reality (AR) experiences without VAC.

Main Methods:

• Developed an aHMD utilizing pixel beam scanning for direct retinal image formation.
• Employed an array of beam splitters to replicate viewing points, enlarging the eye-box and FOV.
• Built and evaluated a prototype aHMD.

Main Results:

• The prototype aHMD achieved a 36° FOV, delivering high-definition, low-color aberration 3D AR images.
• The design ensures image quality is unaffected by eye accommodation changes due to narrow, collimated pixel beams.
• The enlarged eye-box is scalable and allows for easy viewing.

Conclusions:

• The proposed aHMD design offers a scalable solution for enlarged eye-box and FOV.
• It delivers realistic 3D viewing perception without vergence-accommodation conflict (VAC).
• The aHMD provides comfortable, all-day use, mitigating common side effects of conventional 3D and HMD displays.