Full-color holographic display with increased-viewing-angle [Invited]

Abstract

Among the important features of holographic displays are the wide viewing angles and the full color of the reconstructed images. The present work focuses on achievement of both features. We propose an increased-viewing-angle full-color holographic display using two tiled phase-only spatial light modulators (SLMs), a 4f concave mirrors system, and a temporal-spatial multiplexing method. The 4f optical system consists of two concave mirrors and serves to increase the viewing angle. A temporal-spatial multiplexing synchronization control (TSMSC) method is developed to achieve a full-color image and to remove the color crosstalk of the image. We calculate RGB phase-only holograms of a computer-generated color pyramid by using a slice-based Fresnel diffraction algorithm. The experimental results indicate that the proposed display system is feasible to reconstruct a full-color holographic 3D image with a viewing angle of 12.8°, which is about 3.8 times wider than the viewing angle formed by a single SLM.

Visual perception of Fourier rainbow holographic display

“…The dotted lines indicate the calculated values of δ λ with (11). The simulation results presented in Figure 10 prove good accuracy of the developed measures given by (11) and (12).…”

“…Such large distances are selected to illustrate the accuracy of the formulas more precisely. The left plots, using solid lines, present the intensity distributions calculated with the simulation, while the dotted lines indicate values of image blur calculated with (12). The plots on the right present distributions of the spectra, which correspond to the reconstructions showed on the left.…”

Holographic Three-Dimensional Virtual Reality and Augmented Reality Display Based on 4K-Spatial Light Modulators

“…As shown in Figure 6, there are two SLMs tiled in a curved configuration with tiled angle α in order to ensure accurate tiling. When α is smaller than θ, the viewing angle is increased to θ+α in this case [23], otherwise, the reconstructed image is not seen continuously. Under ideal conditions, i.e., α = θ, the dependence of the viewing angle on the pixel pitch of SLMs is as shown in Figure 7a.…”

Pursuing High Quality Phase-Only Liquid Crystal on Silicon (LCoS) Devices

“…There are four major issues for holographic display applications: (1) the slow liquid crystal response time; (2) the small field of view (FoV); (3) the laser speckle effect degrading the image quality when using lasers as a backlight unit; and (4) a reduction in the frame rate for achieving field-sequential color displays [25]. There are many studies where the aforementioned issues have been addressed, such as: (1) 3-4 ms phase-only panel response time of thin cell gap at λ = 633 nm to reduce the dynamic reconstruction holographic image blur [26]; (2) the time-division multiplexing method to increase the FoV [27]; and (3) reduction of the speckle effect in image projection using temporal averaging techniques [28].…”