Extended viewing angle holographic display system with tilted SLMs in a circular configuration

Abstract

This paper presents an extended viewing angle holographic display for reconstruction of real world objects in which the capture and display systems are decoupled. This is achieved by employing multiple tilted spatial light modulators (SLMs) arranged in a circular configuration. In order to prove the proper reconstruction and visual perception of holographic images the Wigner distribution function is employed. We describe both the capture system using a single static camera with a rotating object and a holographic display utilizing six tilted SLMs. The experimental results based on the reconstruction of computer generated and real world scenes are presented. The coherent noise removal procedure is described and implemented. The experiments prove the possibility to view images reconstructed in the display binocularly and with good quality.

Spatiotemporal multiplexing method for visual field of view extension in holographic displays with naked eye observation

“…The good example of the second approach is the "active tiling" system developed by QuinetiQ [9], however, the hardware connected with this system (based on combina− tion of electrically and optically addressed SLM and multi− ple optics) is highly complicated. The second approach is also realized by means of creating larger display through combining reflective type SLMs into flat or curved panel [10][11][12][13][14]. The most common devices used in holographic dis− plays are Liquid Crystal on Silicon (LCoS) spatial light modulators (SLMs) which provide the highest diffraction efficiency and reconstruction accuracy [16].…”

“…One of the solutions is based on spatial multiplexing technique in which several SLMs are arranged on an arc that increase hor− izontal viewing angle [13][14][15]. Such approach is highly ex− pensive since the viewing angle depends on the number of used modulators.…”

“…Here, on the contrary to the naked eye observation method, an image is scattered in vertical direction which allows to see more information vertically (up to the size of FOV) but the vertical parallax is lost. In horizontal direction the size of an image is still limited by an SLM size, but it contains 3D information (limited horizontal parallax) [13] which can be extended by horizontal spatial multiplexing. Another way is to use spatial multiplexing in horizontal and vertical direc− tions and appropriately designed optical system, as shown in Ref.…”

Multiwavefront digital holographic television

“…The most natural way to increase the SBP in holographic systems is to create a larger display through combining reflective type Liquid Crystal on Silicon Spatial Light Modulators (LCSLMs) [10][11][12][13][14] or DMDs [15] into a flat or curved panel. The flat configuration has its limitation for extension of viewing angle for commercially available modulators [16].…”

Wide angle digital holographic interferometry with real-time optical reconstruction

“…DH and DHI brought different, simplified and digital way of holograms recording and their numerical reconstruction [2]. The next step to mimics classical HI is to use electronically addressed spatial light modulators with digital holographic data and reconstruct optically digital holograms formed at SLMs [3]. In such case the procedure of registration and data processing may be realized in two ways: * E-mail: m.kujawinska@mchtr.pw.edu.pl -direct holograms manipulation and display (off-axis holograms have to be recorded and displayed), -calculation of phases in a hologram plane and manipulation of the phases (for a phase calculation inline phase shifting holograms [1] are usually applied, which requires capturing at least 3 PS).…”