Mr. Hu Heteng Profile

Hu Heteng

at Anhui Univ

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Publications (2)

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Proceedings Article | 12 December 2018 Paper

Effects of number of elemental images of lens-array based systems on angular resolution

Bu Min, GuiZhu Wang, Chuan Shen, Sui Wei, QuanBing Zhang, Rong RunQin, Hu Heteng

Proceedings Volume 10845, 108450U (2018) https://doi.org/10.1117/12.2505674

KEYWORDS: Spatial resolution, 3D displays, LCDs, 3D image processing, Imaging systems, Cameras, Image resolution, 3D modeling, 3D acquisition, Eye

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Lens-array based imaging system is a kind of the direct-view system that is currently a hot topic of research. In fact, the viewing parameters of this system have been one of the focuses of research since its invention. However, most current literature discussions are based on depth of field, spatial resolution, and field of view. Only a few documents or products use angular resolution, spatial resolution, and field of view as criteria. The angle resolution is one of the parameters in the human eye vision module. This article will try to discuss the hardware conditions for realizing the angular resolution in the LCD discrete pixel system and its influence on the 3D perception. The results show that the angular resolution is determined by the number of pixels in each sub-image and is proportional to the number of elemental images and is limited by the LCD pixel pitch.

Proceedings Article | 12 December 2018 Paper

liquid crystal phase modulator based on deep sub-grating structure

Hu Heteng, GuiZhu Wang, Sui Wei, Chuan Shen, Rong RunQin, Bu Min

Proceedings Volume 10845, 108450F (2018) https://doi.org/10.1117/12.2505111

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The challenge of dynamic holographic video display based on spatial light modulator is that it requires a large spatial bandwidth product. A simple method is to reduce the size of a single pixel in conventional LCOS (liquid crystal on silicon , LCOS) device. However, with the pixel size shrinks, it also requires a corresponding reduction in thickness of liquid crystal cell, otherwise the fringe field effect between pixels will affect the modulation of normal pixel. A deep sub-wavelength metal grating with a Fabry-Perot resonance is used instead of the top electrode of LCOS to form a liquid crystal phase modulator in this paper. Different from traditional LCOS, which realizes the phase modulation by using the birefringence of the liquid crystal in liquid crystal cell, the birefringence of the liquid crystal in our device is used to modulate the conditions of the reflective boundary of the deep sub-wavelength metal grating, which in turn controls the amount of phase modulation of reflected light in grating slit. The TechWiz and CST Microwave Studios software are used in this paper. Observing the distribution of liquid crystal directors and electric field distribution. Recording the intensity of visible light reflection and observing whether the device can achieve phase modulation of 0 ~ 2π by changing the pixel pitch and grating structure parameters. The simulation results show that there is no significant change in the liquid crystal directors and electric field distribution in different pixel pitch, the device phase modulation is close to^2π , and it has a high reflectivity.

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