Ultra-slim coherent backlight unit for mobile holographic display

Choi, Chil-Sung; Morozov, Alexander; Koshelev, Alexander; Dubynin, Sergey; Dubinin, German; Lee, Sung-Hoon; Chung, Jae‐Seung; Sung, Geeyoung; An, Jungkwuen; Song, Hoon; Seo, Juwon; Kim, Hojung; Seo, Wontaek; Putilin, A. N.; Kopenkin, Sergey; Borodin, Yuriy; Kim, Sun Il; Lee, Hong-Seok; Park, Joon-Yong; Chung, U‐In; Hwang, Seongtaek

doi:10.1117/12.2186387

Cited by 4 publications

(3 citation statements)

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“…3a , the S-BLU consists of the BD (Supplementary Note 2 ) and the C-BLU (Supplementary Note 3 ). The BD steers light 19 and the C-BLU 20 forms the uniform wavefront incident from the BD as shown in Fig. 3b, c .…”

Section: Resultsmentioning

confidence: 99%

Slim-panel holographic video display

Won

Kim

et al. 2020

Nat Commun

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Since its discovery almost 70 years ago, the hologram has been considered to reproduce the most realistic three dimensional images without visual side effects. Holographic video has been extensively researched for commercialization, since Benton et al. at MIT Media Lab developed the first holographic video systems in 1990. However, commercially available holographic video displays have not been introduced yet for several reasons: narrow viewing angle, bulky optics and heavy computing power. Here we present an interactive slim-panel holographic video display using a steering-backlight unit and a holographic video processor to solve the above issues. The steering-backlight unit enables to expand the viewing angle by 30 times and its diffractive waveguide architecture makes a slim display form-factor. The holographic video processor computes high quality holograms in real-time on a single-chip. We suggest that the slim-panel holographic display can provide realistic three-dimensional video in office and household environments.

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Section: Resultsmentioning

confidence: 99%

Slim-panel holographic video display

Won

Kim

et al. 2020

Nat Commun

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“…A proposed design of the wrist vein biometrics authentication system is shown in Figure A. The whole system is installed in the body of a wearable device (1) and it works as follows: light source (2) emits incoherent light which is coupled to the front light unit (FrLU) (3) (Figure B and C) fabricated by the holographic method with taking into account the wavelength required. The FrLU should efficiently couple the light from the light source and direct this light perpendicular to its surface, being a very slim (less than 1 mm) and transparent medium.…”

Section: Methodsmentioning

confidence: 99%

“…To make such solution compact we suggest substitute the DMD with a slim liquid crystal display (LCD) or with a diffusely scattering medium. Another important step contributing to minimization of the wearable system is utilizing a holographic optical element combined with a light source. Thus, in our work we focus on modifying and applying the compressed sensing approach for development of a wearable system meant for wrist vein biometrics authentication purposes.…”

Section: Introductionmentioning

confidence: 99%

Compressed sensing approach for wrist vein biometrics

Lantsov

Ryabko

Shchekin

2017

Journal of Biophotonics

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The work describes features of the compressed sensing (CS) approach utilized for development of a wearable system for wrist vein recognition with single-pixel detection; we consider this system useful for biometrics authentication purposes. The CS approach implies use of a spatial light modulation (SLM) which, in our case, can be performed differently-with a liquid crystal display or diffusely scattering medium. We show that compressed sensing combined with above-mentioned means of SLM allows us to avoid using an optical system-a limiting factor for wearable devices. The trade-off between the 2 different SLM approaches regarding issues of practical implementation of CS approach for wrist vein recognition purposes is discussed. A possible solution of a misalignment problem-a typical issue for imaging systems based upon 2D arrays of photodiodes-is also proposed. Proposed design of the wearable device for wrist vein recognition is based upon single-pixel detection.

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37‐5: Invited Paper: Flat‐Panel Holographic Display

Kim

Song

et al. 2022

Symp Digest of Tech Papers

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A new architecture for a flat panel three‐dimensional holographic display is proposed. We developed a beam steering backlight, which is achieved by the integration of a beam deflector and a coherent backlight unit. In addition, a hologram processor is implemented as a single‐chip FPGA. We built a flat prototype that is slim as 10cm thick. It shows high‐resolution holographic images with an improved viewing angle.

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Ultra-slim coherent backlight unit for mobile holographic display

Cited by 4 publications

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Slim-panel holographic video display

Slim-panel holographic video display

Compressed sensing approach for wrist vein biometrics

37‐5: Invited Paper: Flat‐Panel Holographic Display

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