| 研究課題/領域番号 |
18H03281
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| 研究機関 | 国立研究開発法人情報通信研究機構 |
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研究代表者 |
ボワズ ジャキン 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波応用総合研究室, 研究員 (00726325)
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| 研究分担者 |
大井 隆太朗 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波応用総合研究室, 主任研究員 (40443254)
山本 健詞 国立研究開発法人情報通信研究機構, 戦略的プログラムオフィス研究企画推進室, プランニングマネージャー (70402469)
涌波 光喜 国立研究開発法人情報通信研究機構, 電磁波研究所電磁波応用総合研究室, 主任研究員 (70726140)
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| 研究期間 (年度) |
2018-04-01 – 2021-03-31
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| キーワード | Light field display / 3D display / Hologram printing |
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| 研究実績の概要 |
A hologram printing devise was built and tested. This device is known as a 'fringe printer' which prints 2D diffraction patterns on holographic film. Resolutions upto 0.5 microns could be achieved and holograms upto 20 cm x 20 cm size can be printed. A dedicated software was also built to fully automate the printing process. Initial prints were tested using phase-contrast microscopy and diffraction efficiency measurements. The results revealed that further optimization of laser power and exposure time in the printing process is required to achieve best performance. Once the best performance has been achieved this device will be used to print transmission type holograms.
In the mean-time, reflection type holograms were printed and tested for light-field 3D display capabilities. Curved micro-mirror array was fabricated for size 20cm x 20cm which had 200x200 micro concave-mirrors each of size 1 mm x 0.5 mm. The most difficult task was to calibrate the micro-mirror array screen with respect to the projector pixels. A new calibration procedure was developed and tested. This uses tiny diffuse areas of size 300 microns x 300 microns printed on the top left corners of each micro-mirror array. These areas were used as markers to determine the position of each micro-mirror array. It was also verified that the presence of the diffuse markers does not affect the quality of 3D reconstructions. The new calibration procedure could calibrate curved displays of size 10cm x 10cm. The calibration procedure is currently being improved to adapt large displays of size 20cm x 10cm.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The initial fabrication and testing of curved holographic screen for a curved light field display is now complete. A robust calibration procedure has also been developed and tested. All the above test results conclude that the method works but also points out that there is more space for improvement and optimization. These improvement and optimizations will help achieve larger size displays, wider viewing angles and higher quality. This will be achieved the next one year FY2020-2021. The final target will be to successfully demonstrate a 3D curved light field display of size 20cm x 10cm with a wide-viewing angle. We believe with some more optimization and improvement we will be able to achieve the above target in the next one year.
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| 今後の研究の推進方策 |
The calibration method that currently works on 10cm screen will be improved to adapt to a larger screen of size 20cm. We expect the increase in viewing-angle will be better visible on a 20cm screen than on a 10cm screen.
The projector we use has only 4K x 2K pixels, which limits the maximum depth of the 3D scene to 5 cm. We are also planning to cascade multiple projectors to increase the number of pixels through spatial multiplexing.
The newly built fringe printer will be optimized for laser power and exposure time and extensively tested to fabricate transmission type holograms. The holograms will be fabricated as micro-lens array screens and be used to built a transmission type curved light-field display.
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