Liquid-crystal lens with a focal length that is variable in a wide range

2004 ◽  
Vol 43 (35) ◽  
pp. 6407 ◽  
Author(s):  
Mao Ye ◽  
Bin Wang ◽  
Susumu Sato
Keyword(s):  
Liquid Crystal ◽  
Focal Length ◽  
Wide Range ◽  
Liquid Crystal Lens

Effective Voltage Control of Liquid Crystal Lens for Rapid Focal Length Change

2021 ◽  
Author(s):  
Tsugumi Fukui ◽  
Sota Shimizu ◽  
Keigo Muryobayashi ◽  
Marenori Kawamura ◽  
Susumu Sato ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Focal Length ◽  
Voltage Control ◽  
Length Change ◽  
Effective Voltage ◽  
Liquid Crystal Lens

Liquid crystal lens with four driving voltages and its applications in imaging system with rectangular aperture

2021 ◽  
Author(s):  
Lvhan Xu ◽  
Yalei Zhang ◽  
Zhiqiang Liu ◽  
Mao Ye
Keyword(s):  
Liquid Crystal ◽  
Aspect Ratio ◽  
Imaging System ◽  
Focal Length ◽  
Rectangular Aperture ◽  
Liquid Crystal Lens ◽  
Four Electrodes

Abstract Liquid crystal lens has the characteristic of variable focal length. Many studies have demonstrated that electronically controlled focusing without mechanical movements can be realized by using liquid crystal lenses in imaging system. In this paper, a four-electrodes liquid crystal lens with a rectangular aperture is applied to focus. The aperture’s aspect ratio of the liquid crystal lens can be designed arbitrarily so that installing it with the periscope lens in phones becomes possible.

scholarly journals Electrically Tunable-Focusing Liquid Crystal Microlens Array with Simple Electrode

Crystals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 431 ◽  
Author(s):  
Li-Lan Tian ◽  
Fan Chu ◽  
Hu Dou ◽  
Lei Li ◽  
Qiong-Hua Wang
Keyword(s):  
Liquid Crystal ◽  
Indium Tin Oxide ◽  
Focal Length ◽  
Microlens Array ◽  
Operating Voltage ◽  
Focusing Effect ◽  
Horizontal Orientation ◽  
Wide Range ◽  
Planar Electrodes ◽  
The Individual

An electrically tunable-focusing liquid crystal (LC) microlens array exhibiting a wide-range tunable focal length is proposed. The lower substrate has strip indium tin oxide (ITO) electrodes, the upper substrate has periodic ITO electrodes with a certain gap coated on the inner surface., and an LC microlens is generated between the two strip electrodes. For each LC microlens, the gap between the top planar electrodes is directly above the center of the microlens. Unlike the conventional LC lens, the individual LC microlens is not coated with ITO electrodes on the central part of its upper and lower substrates, which helps to maintain the LC’s horizontal orientation. In the voltage-off state, the focal length of the microlens array is infinity because of the homogeneous LC alignment. At a given operating voltage, an ideal gradient refractive index distribution is induced over the homogeneous LC layer, which leads to the focusing effect. The simulation result shows that the focal length of the LC microlens could be gradually drawn to 0.381 mm with a change of voltage.

128×128 Elements Frequency Driven Liquid Crystal Lens Array with Tunable Focal Length

2010 ◽  
Vol 30 (1) ◽  
pp. 218-223
Author(s):  
李晖 Li Hui ◽  
刘侃 Liu Kan ◽  
张新宇 Zhang Xinyu ◽  
张天序 Zhang Tianxu ◽  
沈绪榜 Shen Xubang
Keyword(s):  
Liquid Crystal ◽  
Focal Length ◽  
Lens Array ◽  
Liquid Crystal Lens

P‐11.6: A blue phase liquid crystal lens with large tunable focal length range using different birefringence materials

2019 ◽  
Vol 50 (S1) ◽  
pp. 920-920
Author(s):  
Xiang-Yu Zhou ◽  
Hu Dou ◽  
Fan Chu ◽  
Li-Lan Tian ◽  
Rui Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Focal Length ◽  
Length Range ◽  
Phase Liquid ◽  
Blue Phase ◽  
Liquid Crystal Lens

scholarly journals Depth-of-Field-Extended Plenoptic Camera Based on Tunable Multi-Focus Liquid-Crystal Microlens Array

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4142 ◽  
Author(s):  
Mingce Chen ◽  
Wenda He ◽  
Dong Wei ◽  
Chai Hu ◽  
Jiashuo Shi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Radiation Power ◽  
Focal Length ◽  
Microlens Array ◽  
Oxide Semiconductor ◽  
Depth Of Field ◽  
Digital Refocusing ◽  
Wide Range ◽  
Cmos Sensor ◽  
Plenoptic Camera

Plenoptic cameras have received a wide range of research interest because it can record the 4D plenoptic function or radiance including the radiation power and ray direction. One of its important applications is digital refocusing, which can obtain 2D images focused at different depths. To achieve digital refocusing in a wide range, a large depth of field (DOF) is needed, but there are fundamental optical limitations to this. In this paper, we proposed a plenoptic camera with an extended DOF by integrating a main lens, a tunable multi-focus liquid-crystal microlens array (TMF-LCMLA), and a complementary metal oxide semiconductor (CMOS) sensor together. The TMF-LCMLA was fabricated by traditional photolithography and standard microelectronic techniques, and its optical characteristics including interference patterns, focal lengths, and point spread functions (PSFs) were experimentally analyzed. Experiments demonstrated that the proposed plenoptic camera has a wider range of digital refocusing compared to the plenoptic camera based on a conventional liquid-crystal microlens array (LCMLA) with only one corresponding focal length at a certain voltage, which is equivalent to the extension of DOF. In addition, it also has a 2D/3D switchable function, which is not available with conventional plenoptic cameras.

Ultra-fast liquid crystal lens with variable focal length

2020 ◽  
Vol 696 (1) ◽  
pp. 29-42
Author(s):  
O. Kurochkin ◽  
O. Buluy ◽  
V. Nazarenko ◽  
Yu. Nastishin ◽  
J. Varshal ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Focal Length ◽  
Liquid Crystal Lens
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