Crosstalk noise reduction of angle-multiplexed volume-holographic gratings for see-through lightguide display

Area of Science:

• Optics and Photonics
• Display Technology
• Holography

Background:

• Angle multiplexing is vital for expanding the field of view (FOV) in volume holographic grating (VHG) based lightguide displays.
• Bragg mismatch diffraction from angle-multiplexed gratings causes crosstalk and ghost images, degrading display quality.

Purpose of the Study:

• To analyze the causes of ghost image formation in angle-multiplexed holographic gratings.
• To propose and validate an optimized recording method for minimizing crosstalk noise and suppressing ghost images in VHG lightguide displays.

Main Methods:

• Detailed analysis of ghost image formation mechanisms due to Bragg mismatch in angle-multiplexed gratings.
• Development of an optimized recording procedure to achieve uniform grating vectors across holographic films.
• Experimental validation of the proposed method's effectiveness in reducing crosstalk.

Main Results:

• The optimized recording method ensures uniform grating vectors for all angle-multiplexed gratings.
• Consistent grating periods across gratings lead to corrected crosstalk diffraction angles.
• Significant suppression of ghost images was achieved, improving display fidelity.

Conclusions:

• The proposed optimized recording method effectively mitigates crosstalk and ghost images in VHG lightguide displays.
• Achieving uniform grating vectors is key to correcting diffraction angles and enhancing display performance.
• This technique offers a viable solution for high-quality holographic display systems.