Time-multiplexed light field display with 120-degree wide viewing angle

Liu, Boyang; Sang, Xinzhu; Yu, Xunbo; Gao, Xin; Liu, Li; Gao, Chao; Wang, Peiren; Lan, Yang; Du, Jingyan

doi:10.1364/oe.27.035728

Cited by 53 publications

(9 citation statements)

References 22 publications

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“…17 Further, Liu et al formed 40 deg OVZs in three directions using multidirectional backlight units and displayed a 3D image with a wide viewing zone of 120 deg in the horizontal direction using a lenticular lens. 18 Because the aforementioned methods use projectors or LED arrays, the COVZ is static. In addition, they are primarily aimed at expanding the viewing zone by forming the COVZ and do not consider narrowing the OVZ to increase the light ray density.…”

Section: D Display System That Forms Covzmentioning

confidence: 99%

Integral three-dimensional display system with wide viewing zone and depth range using time-division display and eye-tracking technology

et al. 2022

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We propose an integral three-dimensional (3D) display system with a wide viewing zone and depth range using a time-division display and eye-tracking technology. In the proposed system, the optical viewing zone (OVZ) is narrowed to a size that only covers an eye to increase the light ray density using a lens array with a long focal length. In addition, a system with low crosstalk with respect to the viewer's movement is constructed by forming a combined OVZ (COVZ) that covers both eyes through a time-division display. Further, an eye-tracking directional backlight is used to dynamically control the COVZ and realize a wide system viewing zone (SVZ). The luminance unevenness is reduced by partially overlapping two OVZs. The combination of OVZs formed a COVZ with an angle that is ∼1.6 times larger than that of the OVZ, and an SVZ of 81.4 deg and 47.6 deg for the horizontal and vertical directions, respectively, was achieved using the eye-tracking technology. The comparison results of the three types of display systems (i.e., the conventional system, our previously developed system, and our currently proposed system) confirmed that the depth range of the 3D images in the proposed system is wider than that of the other systems.

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Section: D Display System That Forms Covzmentioning

confidence: 99%

Integral three-dimensional display system with wide viewing zone and depth range using time-division display and eye-tracking technology

et al. 2022

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“…Kim et al developed a time-multiplexed sequential projection structure to display two-directional elemental image sets on the same image screen so that the viewing angle was doubled [ 15 ]. Sang et al utilized three groups of directional backlights and a fast-switching LCD panel to multiplex the limited pixels in time division and reached a 120-degree wide viewing angle [ 16 ]. In addition, the combination of position-tracking technologies and 3D display technologies provides an important way to overcome the challenges of viewing angle enhancement in the InIm system.…”

Section: Introductionmentioning

confidence: 99%

Wide-Viewing-Angle Integral Imaging System with Full-Effective-Pixels Elemental Image Array

Liu

Deng

2023

Micromachines

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There exists a defect of the narrow viewing angle in the conventional integral imaging system. One reason for this is that only partial pixels of each elemental image contribute to the viewing angle and the others cause image flips. In this paper, a wide-viewing-angle integral imaging system with a full-effective-pixels elemental image array (FEP-EIA) was proposed. The correspondence between viewpoints and pixel coordinates within the elemental image array was built up, and effective pixel blocks and pixels leading to flipping images were deduced. Then, a pixel replacement method was proposed to generate the FEP-EIAs, which adapt to different viewing distances. As a result, the viewing angle of the proposed integral imaging system was effectively extended through the replacement of the pixels, which caused the image flips. Experiment results demonstrated that wide viewing angles are available for the proposed integral imaging system regardless of the viewing distances.

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“…As a result, a compact battery system working for a long time is available, thus improving the mobility and performance of vehicle speed guns. LEDs typically emit light with a beam view angle of about 120-degree angle if no optical lens or reflector is used (Liu et al 2019). Therefore, a LED array for illumination is just effective only if it is designed and used with accordant optical lenses with special application.…”

Section: Introductionmentioning

confidence: 99%

Design of Optical Collimator System for Vehicle Speed Gun using Non-Imaging Optics

Nhut

Pham

Tran³

et al. 2023

Int. J. Renew. Energy Dev.

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Vehicle speed guns are usually used in normal sunlight conditions (daytime). If we want to use vehicle speed guns in low light conditions (nighttime), the illuminator is needed to provide sufficient light for the vehicle speed gun to take photos. The illuminator must fulfill two requirements: (i) using the infrared wavelength to ensure that the driver is not startled by dazzling eyes by the illuminator of the proposed speed gun system and (ii) high energy efficiency to make the illuminator compact leading to the use a small battery system to improve the portable of the proposed vehicle speed gun. In this study, an illuminator using a collimator system designed by using non-imaging optics is introduced. LEDs with infrared wavelength are chosen from the library of LightToolsTM, the structure of collimated is designed to transfer the illumination from the LEDs array to a square area of 3x3 m2 to cover the vehicle to detect the vehicle number plate. The design process is built based on the conservation of optical path length in the Matlab program. After that, the designed collimator is simulated in LightToolsTM software. The promising results of the simulation in LightToolsTM show that the collimator can efficiently transfer light from the LED array to the target area with a uniformity of about 70 % and optical efficiency of about 80 %.

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Time-multiplexed light field display with 120-degree wide viewing angle

Cited by 53 publications

References 22 publications

Integral three-dimensional display system with wide viewing zone and depth range using time-division display and eye-tracking technology

Integral three-dimensional display system with wide viewing zone and depth range using time-division display and eye-tracking technology

Wide-Viewing-Angle Integral Imaging System with Full-Effective-Pixels Elemental Image Array

Design of Optical Collimator System for Vehicle Speed Gun using Non-Imaging Optics

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