Abstract
Optically addressed spatial light modulators (OASLMs) provide an appropriate solution for large-area and wide-viewing angle holographic displays because of the possibility of uploading holograms on it through tiling and with sub-micron diffraction feature sizes. A prototype with a large-size OASLM of 100 mm × 100 mm was fabricated using a solution-based deposition process for ZnO nanoparticles (NPs). ZnO NP-based OASLM is suitable for hologram tiling because of the extended charge carrier lifetime as a result of trap states in the ZnO NP layer annealed at a low temperature of 180°C, of which the activation energy was determined firstly by low-temperature measurements. Operating the ZnO NP OASLM in a DC driving mode was subsequently proposed, to utilize the extended charge carrier lifetime in the photosensor layer for temporary information storage. Finally, techniques to tile computer generated holograms (CGHs) spatially on a single OASLM were explored and evaluated, including the demonstration of simultaneous image replay from sequentially tiled two separate phase-only CGHs.
Highlights
Holographic displays are ideal to display three-dimensional (3D) images with all the accommodation depth cues
We propose a DC driving scheme with occasional resets for the Optically addressed spatial light modulators (OASLMs) and demonstrate it for tiling holograms for image reply
The characteristics of a large-size OASLM fabricated using solution-processed ZnO NPs together with nematic liquid crystal (LC) have been studied in detail
Summary
Holographic displays are ideal to display three-dimensional (3D) images with all the accommodation depth cues. Current commercial SLMs are based on liquid crystal (LC), e.g. LC on silicon (LCOS) and digital micromirror devices (DMD), both of which have relatively small pixel sizes and a limited viewing aperture. To overcome this challenge, multiple SLMs may be tiled spatially or angularly. A large-area high-resolution hologram can be created by tiling holographic patterns onto an optically addressed SLM (OASLM). QinetQ [1,2] used a method termed Active Tiling to achieve a very high pixel count using a high speed binary electrically addressed SLM (EASLM) as an image engine and a bi-stable ferroelectric LC based OASLM. We propose a DC driving scheme with occasional resets for the OASLM and demonstrate it for tiling holograms for image reply
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