Dynamic exit pupil trackers for autostereoscopic displays

Area of Science:

• Optics and Photonics
• Display Technology
• Computer Vision

Background:

• Autostereoscopic displays offer glasses-free 3D viewing but often face limitations in viewing angle and viewer freedom.
• Existing dynamic exit pupil (DEP) tracking methods have constraints in spatial range and viewer capacity.

Purpose of the Study:

• To present the first demonstrations of two distinct DEP tracker techniques for advanced autostereoscopic displays.
• To enhance the viewing experience by expanding the 3D viewing volume and reducing crosstalk.

Main Methods:

• Developed a DEP tracker using moving shutter glasses within the optical system for single-viewer tracking.
• Implemented a second DEP system utilizing a spatial light modulator (SLM) for dynamic, multi-pupil control.
• Integrated DEP optics as a dynamic backlight for a liquid crystal display (LCD).

Main Results:

• The first DEP tracker prototype enabled a 40 cm x 20 cm lateral and 30 cm axial viewing region for a single user with low crosstalk.
• The SLM-based DEP system demonstrated simultaneous control of multiple exit pupils, creating a large 3D viewing volume (0.6-3 m axial, ±20° lateral) for multiple viewers.
• Both systems achieved acceptable stereo image crosstalk (<5%).

Conclusions:

• The demonstrated DEP tracker techniques significantly expand the capabilities of autostereoscopic displays.
• These innovations pave the way for more immersive and interactive glasses-free 3D experiences for multiple users.
• The integration with LCDs offers advantages in display size and image quality.