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Proceedings Paper

Coherent backlight unit using holographic optical elements for full-color flat-panel holographic display
Author(s): Sun Il Kim; Chil-Sung Choi; Jungkwuen An; Hoon Song; Yunhee Kim; Young Kim; Geeyoung Sung; Wontaek Seo; Juwon Seo; Yun-Tae Kim; Hojung Kim; Yongkyu Kim; Hong-Seok Lee; Sungwoo Hwang
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Paper Abstract

We propose the coherent backlight unit (BLU) using Holographic Optical Element (HOE) for full-color flat-panel holographic display. The HOE BLU consists of two reflective type HOEs that change the optical beam path and shape by diffraction. The diverging incident beam is transformed to the collimated beam which has a very small diffraction angle (7.5°) by HOE 1 (H1) in order to illuminate the whole display. This collimated beam is converged to a point at a distance from the glass substrate by HOE 2 (H2). As a result, the diverging incident beam is converted to a point light by H1 and H2. When the high resolution Spatial Light Modulator (SLM) displaying Computer Generated Hologram (CGH) is illuminated by HOE BLU, the hologram image is displayed at a view point near focal point. Practically, we fabricated the full color HOE BLU for 5.5" flat panel holographic display by using the proposed design. At least 5.5" size of HOE is required to illuminate the whole panel. For this reason, we recorded 150 mm x 90 mm size HOE on the 10 mm thickness glass substrate. This HOE BLU exhibits a total efficiency of 8.0% at Red (660 nm), 7.7% at Green (532 nm), 3.2% at Blue (460 nm) using optimized recording conditions for each wavelength. Finally, a bright full color hologram image was achieved.

Paper Details

Date Published: 6 April 2017
PDF: 7 pages
Proc. SPIE 10127, Practical Holography XXXI: Materials and Applications, 1012703 (6 April 2017); doi: 10.1117/12.2249744
Show Author Affiliations
Sun Il Kim, Samsung Advanced Institute of Technology (Korea, Republic of)
Chil-Sung Choi, Samsung Advanced Institute of Technology (Korea, Republic of)
Jungkwuen An, Samsung Advanced Institute of Technology (Korea, Republic of)
Hoon Song, Samsung Advanced Institute of Technology (Korea, Republic of)
Yunhee Kim, Samsung Advanced Institute of Technology (Korea, Republic of)
Young Kim, Samsung Advanced Institute of Technology (Korea, Republic of)
Geeyoung Sung, Samsung Advanced Institute of Technology (Korea, Republic of)
Wontaek Seo, Samsung Advanced Institute of Technology (Korea, Republic of)
Juwon Seo, Samsung Advanced Institute of Technology (Korea, Republic of)
Yun-Tae Kim, Samsung Advanced Institute of Technology (Korea, Republic of)
Hojung Kim, Samsung Advanced Institute of Technology (Korea, Republic of)
Yongkyu Kim, Samsung Advanced Institute of Technology (Korea, Republic of)
Hong-Seok Lee, Samsung Advanced Institute of Technology (Korea, Republic of)
Sungwoo Hwang, Samsung Advanced Institute of Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 10127:
Practical Holography XXXI: Materials and Applications
Hans I. Bjelkhagen; V. Michael Bove, Editor(s)

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