44.3: A Liquid Crystal Lens with Non‐uniform Anchoring Energy

Valyukh, Sergiy; Chigrinov, Vladimir G.; Kwok, Hoi Sing

doi:10.1889/1.3069750

Cited by 13 publications

(21 citation statements)

References 11 publications

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“…In order to see both the microdisplay located immediate vicinity of the eye and objects from ambient, it is necessary to have a switchselectable lens. Liquid crystal (LC) lenses are most suitable for such purposes [19][20][21][22]. Although they cannot compete with refractive lenses in low F-number, LC lenses, nevertheless, are suited for a microlens array for a contact lens [10,11].…”

Section: Resultsmentioning

confidence: 99%

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Assessment of minimum permissible geometrical parameters of a near-to-eye display

Valyukh

Slobodyanyuk

2015

Appl. Opt.

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Light weight and small dimensions are some of the most important characteristics of near-to-eye displays (NEDs). These displays consist of two basic parts: a microdisplay for generating an image and supplementary optics in order to see the image. Nowadays, the pixel size of microdisplays may be less than 4 mu m, which makes the supplementary optics the major factor in defining restrictions on a NED dimensions or at least on the distance between the microdisplay and the eye. The goal of the present work is to find answers to the following two questions: how small this distance can be in principle and what is the microdisplay maximum resolution that stays effective to see through the supplementary optics placed in immediate vicinity of the eye. To explore the first question, we consider an aberration-free magnifier, which is the initial stage in elaboration of a real optical system. In this case, the paraxial approximation and the transfer matrix method are ideal tools for simulation of light propagation from the microdisplay through the magnifier and the human eyes optical system to the retina. The human eye is considered according to the Gullstrand model. Parameters of the magnifier, its location with respect to the eye and the microdisplay, and the depth of field, which can be interpreted as the tolerance of the microdisplay position, are determined and discussed. The second question related to the microdisplay maximum resolution is investigated by using the principles of wave optics. (C) 2015 Optical Society of Americ

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Section: Resultsmentioning

confidence: 99%

“…In summary, although we have mostly considered the customary refractive lens, the many results obtained in this work can be applied for other types of lens, e.g. gradient index (GRIN) lenses [18,[20][21][22]. GRIN lenses based on liquid crystals are tuneable and can be driven by low voltage (up to 1V) [20][21][22].…”

Section: Resultsmentioning

confidence: 99%

Assessment of minimum permissible geometrical parameters of a near-to-eye display

Valyukh

Slobodyanyuk

2015

Appl. Opt.

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“…Several types of LC optical elements have been proposed [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The needed spatial distribution of the LC director is achieved in the majority cases by means of an inhomogeneous electric field [1][2][3][4][5][6][7][8][9][10][11][12] or with a thickness variations [1,2,13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Implementation of inhomogeneous alignment, in particular inhomogeneous anchoring [15,16] or the pre-tilt angle variation [17][18][19], makes possible to achieve a desired formation of the LC director distribution under a uniform electric field. The corresponding optical element can be controlled through a pair of continoues electrodes and be free of the drawbacks mentioned above.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the apparent simplicity of the methods utilizing inhomogeneous alignment and several projects devoted to this subject [15][16][17][18][19], a set of questions related to the potential of the corresponding LC DOE remains unclear. For example, there is no clear evidence about the extreme characteristics that can be achieved by such kind of LC DOE.…”

Section: Introductionmentioning

confidence: 99%

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On liquid crystal diffractive optical elements utilizing inhomogeneous alignment

Valyukh¹,

Chigrinov²,

Kwok³

et al. 2012

Opt. Express

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Formation of a desired liquid crystal (LC) director distribution by the use of inhomogeneous anchoring and pre-tilt angle for electrically controlled diffractive optical elements (DOE) is studied. Such LC DOE can have high periodicity and diffraction efficiency. At the same time they are free of constructive regularities, e.g. a periodic arrangement of the electrodes or thickness deviations, which have undesired impact on diffractive characteristics of LC DOE of other types. We focus on evaluation of potential functional abilities of LC DOE with inhomogeneous alignment. The reasons causing restriction of the LC DOE diffraction efficiency and periodicity are considered. Approaches for improvement of characteristics of the LC DOE are discussed. ©2012 Optical Society of America

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29.2: Distinguished Student Paper: Tunable Polymer Localized Liquid Crystal Lenses for Autostereoscopic 3D Displays

Sergan

Heugten³

et al. 2012

Symp Digest of Tech Papers

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In this paper, we demonstrate a polymer localized liquid crystal (PLLC) lens for autostereoscopic 3D application. The no-voltage focal length of a PLLC lens is set by the polymerization conditions, but can be varied by the application of a voltage which is promising for tracking the viewer position. The fabrication process does not require a shaped substrate, complicated electrode patterns or an optimized driving voltage to make a parabolic optical phase shape. Therefore, both fabrication and driving process are relatively simple with this type of lens.

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44.3: A Liquid Crystal Lens with Non‐uniform Anchoring Energy

Cited by 13 publications

References 11 publications

Assessment of minimum permissible geometrical parameters of a near-to-eye display

Assessment of minimum permissible geometrical parameters of a near-to-eye display

On liquid crystal diffractive optical elements utilizing inhomogeneous alignment

29.2: Distinguished Student Paper: Tunable Polymer Localized Liquid Crystal Lenses for Autostereoscopic 3D Displays

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