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Tian LL, Yu L, Zeng YM, Li Y, Guo Z, Li L, Zhang Y, Chu F. Stimuli-responsive grating with a tunable period and a diffraction order. OPTICS LETTERS 2023; 48:5551-5554. [PMID: 37910700 DOI: 10.1364/ol.503983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 09/30/2023] [Indexed: 11/03/2023]
Abstract
The next-generation diffraction grating not only requires a nonmechanical control and a remote control to generate a diffraction pattern but also requires a tunable period. Here, we propose a stimuli-responsive liquid crystal (LC) phase grating with a tunable period and a diffraction order. The stimuli-responsive LC diffraction grating is composed of periodically arranged electrodes on a double-sided glass substrate. By adjusting the driving scheme, the pitch and diffraction order of the LC grating can be switched between three different modes. The experimental results show that the LC grating has a lower driving voltage (∼5 V). In addition, the tunable LC grating can achieve more diffraction orders, which can be applied to a holographic display to achieve a wide-viewing angle and an enlarged size.
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Li YL, Li NN, Wang D, Chu F, Lee SD, Zheng YW, Wang QH. Tunable liquid crystal grating based holographic 3D display system with wide viewing angle and large size. LIGHT, SCIENCE & APPLICATIONS 2022; 11:188. [PMID: 35729102 PMCID: PMC9213428 DOI: 10.1038/s41377-022-00880-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 06/03/2022] [Accepted: 06/08/2022] [Indexed: 05/17/2023]
Abstract
As one of the most ideal display approaches, holographic 3-dimensional (3D) display has always been a research hotspot since the holographic images reproduced in such system are very similar to what humans see the actual environment. However, current holographic 3D displays suffer from critical bottlenecks of narrow viewing angle and small size. Here, we propose a tunable liquid crystal grating-based holographic 3D display system with wide viewing angle and large size. Our tunable liquid crystal grating, providing an adjustable period and the secondary diffraction of the reconstructed image, enables to simultaneously implement two different hologram generation methods in achieving wide viewing angle and enlarged size, respectively. By using the secondary diffraction mechanism of the tunable liquid crystal grating, the proposed system breaks through the limitations of narrow viewing angle and small size of holographic 3D display. The proposed system shows a viewing angle of 57.4°, which is nearly 7 times of the conventional case with a single spatial light modulator, and the size of the reconstructed image is enlarged by about 4.2. The proposed system will have wide applications in medical diagnosis, advertising, education and entertainment and other fields.
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Affiliation(s)
- Yi-Long Li
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China
| | - Nan-Nan Li
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China
| | - Di Wang
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China.
| | - Fan Chu
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China
| | - Sin-Doo Lee
- Display Technology Research Center, Seoul National University, Gwanak-gu, Seoul, Republic of Korea
| | - Yi-Wei Zheng
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China
| | - Qiong-Hua Wang
- School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China.
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Yin K, Hsiang EL, Zou J, Li Y, Yang Z, Yang Q, Lai PC, Lin CL, Wu ST. Advanced liquid crystal devices for augmented reality and virtual reality displays: principles and applications. LIGHT, SCIENCE & APPLICATIONS 2022; 11:161. [PMID: 35637183 PMCID: PMC9151772 DOI: 10.1038/s41377-022-00851-3] [Citation(s) in RCA: 60] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 05/04/2022] [Accepted: 05/14/2022] [Indexed: 05/20/2023]
Abstract
Liquid crystal displays (LCDs) and photonic devices play a pivotal role to augmented reality (AR) and virtual reality (VR). The recently emerging high-dynamic-range (HDR) mini-LED backlit LCDs significantly boost the image quality and brightness and reduce the power consumption for VR displays. Such a light engine is particularly attractive for compensating the optical loss of pancake structure to achieve compact and lightweight VR headsets. On the other hand, high-resolution-density, and high-brightness liquid-crystal-on-silicon (LCoS) is a promising image source for the see-through AR displays, especially under high ambient lighting conditions. Meanwhile, the high-speed LCoS spatial light modulators open a new door for holographic displays and focal surface displays. Finally, the ultrathin planar diffractive LC optical elements, such as geometric phase LC grating and lens, have found useful applications in AR and VR for enhancing resolution, widening field-of-view, suppressing chromatic aberrations, creating multiplanes to overcome the vergence-accommodation conflict, and dynamic pupil steering to achieve gaze-matched Maxwellian displays, just to name a few. The operation principles, potential applications, and future challenges of these advanced LC devices will be discussed.
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Affiliation(s)
- Kun Yin
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - En-Lin Hsiang
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Junyu Zou
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Yannanqi Li
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Zhiyong Yang
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Qian Yang
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Po-Cheng Lai
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Chih-Lung Lin
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA
| | - Shin-Tson Wu
- College of Optics and Photonics, University of Central Florida, Orlando, FL, 32816, USA.
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Patterned-Liquid-Crystal for Novel Displays. CRYSTALS 2022. [DOI: 10.3390/cryst12020185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The “Patterned-Liquid-Crystal for Novel Displays” is a Special Issue focused on new insights and explorations in the field of liquid crystals arranged in a periodic patterned way [...]
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Recent Advances in Photoalignment Liquid Crystal Polarization Gratings and Their Applications. CRYSTALS 2021. [DOI: 10.3390/cryst11080900] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Liquid crystal (LC) circular polarization gratings (PGs), also known as Pancharatnam–Berry (PB) phase deflectors, are diffractive waveplates with linearly changed optical anisotropy axes. Due to the high diffraction efficiency, polarization selectivity character, and simple fabrication process, photoalignment LC PGs have been widely studied and developed especially in polarization management and beam split. In this review paper, we analyze the physical principles, show the exposure methods and fabrication process, and present relevant promising applications in photonics and imaging optics.
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