Three-terminal adaptive nematic liquid-crystal lens device

Riza, Nabeel A.; DeJule, Michael

doi:10.1364/ol.19.001013

Cited by 158 publications

(59 citation statements)

References 4 publications

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“…(GE-CRD) fabricated novel electronically controlled LC lens devices [17], including for eye correction measurement applications [18,19]. Specifically, to the best of our knowledge, Riza, in 1989, first proposed the use of the LC E-Lens for eye exams (see Figure 3) to measure refractive power change [18].…”

Section: History Of Electronic Lenses In Human Vision Carementioning

confidence: 99%

“…Since the 1960s, the Radio Corporation of America (RCA) and later the parent company General Electric (GE), pioneered the use of LCs for designing optical displays such as in watches, avionics, and television systems, and also for designing optical switches [14][15][16]. Starting in the mid-1980s, the LC Display (LCD) lab at the General Electric Corporate Research and Development Center (GE-CRD) fabricated novel electronically controlled LC lens devices [17], including for eye correction measurement applications [18,19]. Specifically, to the best of our knowledge, Riza, in 1989, first proposed the use of the LC E-Lens for eye exams (see Figure 3) to measure refractive power change [18].…”

Section: History Of Electronic Lenses In Human Vision Carementioning

confidence: 99%

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Eye Vision Testing System and Eyewear Using Micromachines

2015

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Proposed is a novel eye vision testing system based on micromachines that uses micro-optic, micromechanic, and microelectronic technologies. The micromachines include a programmable micro-optic lens and aperture control devices, pico-projectors, Radio Frequency (RF), optical wireless communication and control links, and energy harvesting and storage devices with remote wireless energy transfer capabilities. The portable lightweight system can measure eye refractive powers, optimize light conditions for the eye under testing, conduct color-blindness tests, and implement eye strain relief and eye muscle exercises via time sequenced imaging. A basic eye vision test system is built in the laboratory for near-sighted (myopic) vision spherical lens refractive error correction. Refractive error corrections from zero up to´5.0 Diopters and´2.0 Diopters are experimentally demonstrated using the Electronic-Lens (E-Lens) and aperture control methods, respectively. The proposed portable eye vision test system is suited for children's eye tests and developing world eye centers where technical expertise may be limited. Design of a novel low-cost human vision corrective eyewear is also presented based on the proposed aperture control concept. Given its simplistic and economical design, significant impact can be created for humans with vision problems in the under-developed world.

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Section: History Of Electronic Lenses In Human Vision Carementioning

confidence: 99%

Section: History Of Electronic Lenses In Human Vision Carementioning

confidence: 99%

Eye Vision Testing System and Eyewear Using Micromachines

2015

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“…A tunable liquid crystal lens has been investigated, and several configurations have been proposed, such as using nonuniform cell gap 17,18 or structured electrode. [19][20][21][22][23][24][25] We shall show that by using the variable pretilt approach, a large size lens with reasonable F numbers can be fabricated.…”

Section: Introductionmentioning

confidence: 96%

Tunable lens by spatially varying liquid crystal pretilt angles

Tseng

Fan

Lee

et al. 2011

Journal of Applied Physics

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We report a method of obtaining controllable spatially varying liquid crystal pretilt angles using a stacked alignment layer. The stacked alignment layer consists of nano-domains of horizontal and vertical alignment materials. The pretilt angle is controlled by varying the domain ratio of the two layers. By using photoalignment material as the top layer, the pretilt angle can be controlled by varying the UV light dosage. A spatially variable UV light beam can be used to control the pretilt angle spatially. An electrically tunable-focus liquid crystal lens is obtained using this method.

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“…6 Many approaches have been demonstrated to also build nematic LC (NLC) components for optical imaging. 1,[7][8][9][10][11][12][13][14][15][16][17] However, those materials have a fundamental limitation: they are polarization sensitive since the refractive index modulation here is achieved by the electrical field-induced reorientation of their local anisotropy axis (commonly called "director," representing the local average direction of the long molecular axes of the NLC 4 ). Figure 1(a) schematically demonstrates an electrically variable NLC lens using a single-layer of NLC that is in the Y; Z plane (with its ground state director being parallel with the Y-axis).…”

Section: Introductionmentioning

confidence: 99%

Focusing unpolarized light with a single-nematic liquid crystal layer

Galstian

Allahverdyan

2015

Opt. Eng

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Abstract. We describe a simple but very efficient optical device that allows the dynamic focusing of unpolarized light using a single-nematic liquid crystal layer. The operation principle of the proposed device is based on the combination of an electrically variable "half-lens" with two fixed optical elements for light reflection and a 90-deg polarization flip. Such an approach is made possible thanks to the close integration of the thin film wave plate and mirror. Preliminary experimental studies of the obtained electrically variable mirror show very promising results. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Three-terminal adaptive nematic liquid-crystal lens device

Cited by 158 publications

References 4 publications

Eye Vision Testing System and Eyewear Using Micromachines

Eye Vision Testing System and Eyewear Using Micromachines

Tunable lens by spatially varying liquid crystal pretilt angles

Focusing unpolarized light with a single-nematic liquid crystal layer

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