Expansion of display area for tabletop volume holographic displays using spatially-shifted angular multiplexing

This paper presents an exposure method with controlled incident angles to expand the display area of a tabletop volume holographic display. In conventional exposure schemes for area enlargement, identical exposure conditions at different recording positions cause diffracted light from each region to converge at different observation points, preventing simultaneous perception of the entire displayed image. To overcome this limitation, the proposed method adjusts the incident angle of the signal beam at each exposure stage according to the spatial shift of the recording position. This exposure design enables diffracted light from the enlarged hologram area to converge at a designated observation position. Experimental results confirm that the proposed exposure method successfully enlarges the effective display screen and increases the amount of visual information, demonstrating its feasibility for large-scale tabletop volume holographic displays.