Electro-wetting lenticular lens with improved diopter for 2D and 3D conversion using lens-shaped ETPTA chamber

Abstract

In this paper, we introduce a method for improving the lens diopter of 2D/3D convertible devices using electro-wetting. For stable operation, an electro-wetting device requires high dioptric performance and this was achieved using bi-convex liquid-liquid-solid phases. 1-Chloronaphthalene with a refractive index of 1.633 was used as an oil phase to achieve high diopters. ETPTA (trimethylolpropane ethoxylate triacrylate), a UV-sensitive material with low chemical reactivity to the 1-Chloronaphthalene, was used as a chamber material. This resulted in a diopter of 3030D for high quality multi-view images without unstable oil movement or trembling. The ETPTA was molded on a 0.3mm thick glass substrate that was coated with UV adhesive (NOA 81). The maximum diopter capable of stable operation was 3425D. 2D and 3D conversion and parallax motion were demonstrated.

Reliable Determination of Contact Angle from the Liquid Fence

“…The relationship between the voltage U and the contact angle θ is described by the Young-Lippmann equation: cos 0.25em θ = cos 0.25em θ 0 + 1 2 ε r ε 0 γ lv normale U 2 where e is the thickness of the dielectric layer, ε r is the relative dielectric constant, ε 0 is the vacuum dielectric constant, γ lv is the surface tension of the liquid–gas interface, and θ 0 is the initial contact angle. The relationship between contact angle and voltage is a direct manifestation of the electrowetting on dielectric (EWOD) effect. − To verify the measurement accuracy of the fence method for measuring the contact angle, an experimental device was designed, as shown in Figure , and used to perform measurement experiments using the liquid fence method, geometric method, and traditional sessile droplet method. The signal generator and power amplifier constitute an AC power supply, placing the liquid fence on a three-dimensional adjustment frame.…”

Optofluidic lenses for 2D and 3D imaging

“…[ [137][138][139][140], elastomer-liquid lenses [141] or LC lenses [142,143] can be used. In an electrowetting lenticular display design, an electrowetting lens array is formed by placing an oil solution in an array of micro-wells and encapsulated by water.…”

Electrowetting lens with large aperture and focal length tunability

“…Zohrabi et al presented numerical simulations of multielectrode electrowetting devices used in a novel optical design for obtaining correct wavefront aberration 11 . Kim et al designed an electrowetting lenticular lens with high diopter, using a lens-shaped ETPTA(trimethylopropane ethoxylate triacrylate) chamber 12 . Kopp et al proposed an all dual-lens optofluidic zoom system whose focal length could be expanded using the two combined liquid lens method 13 .…”