An Autostereoscopic Device for Mobile Applications Based on a Liquid Crystal Microlens Array and an OLED Display

Abstract

Abstract-In recent years, many experimental and theoretical research groups worldwide have actively worked on demonstrating the use of liquid crystals (LCs) as adaptive lenses for image generation, waveform shaping, and non-mechanical focusing applications. In particular, important achievements have concerned the development of alternative solutions for 3D vision. This work focuses on the design and evaluation of the electro-optic response of a LC-based 2D/3D autostereoscopic display prototype. A strategy for achieving 2D/3D vision has been implemented with a cylindrical LC lens array placed in front of a display; this array acts as a lenticular sheet with a tunable focal length by electrically controlling the birefringence. The performance of the 2D/3D device was evaluated in terms of the angular luminance, image deflection, crosstalk, and 3D contrast within a simulated environment. These measurements were performed with characterization equipment for autostereoscopic 3D displays (angular resolution of 0.03°).

Multifrequency Driven Nematics

“…This dependence gives raise to the possibility of designing liquid crystal mixtures with very low relaxation frequencies of electric permittivity parallel ε , which is useful for many applications [16]. Apart from traditional SLM, the unique properties of this LC mixture can be used in all kind of optical phase modulators recently reported, e.g., adaptive lenses [17], beam steering [18], correction of aberrations [19], 3D vision applications [19][20][21][22], novel aberrations correctors for rectangular apertures [23], microaxicon arrays [24], multioptical elements [25], hole-patterned microlenses [26], multifocal microlenses [27], high fill-factor microlenses [28], frequency controlled [29] microlenses, optical vortices [30], lensacons, and logarithmic axicons [31]. The LC mixtures used in this work have been designed by mixing three different families of LC compounds to meet the requirements of the LC to be controlled by low frequencies of the electrical applied voltage.…”

Liquid Crystal Temperature Sensor Based on Three Electrodes and a High-Resistivity Layer

“…Thanks to this, the structure produces a high voltage output that does not need any type of amplification circuitry. Several materials can be employed, depending on the necessary sheet resistance (R sq ), for instance, Titanium Oxide (TiO 2 ) [17], PEDOT [18], thin films of ITO [19] or Nickel [20], etc. The resistivity of these materials ranges from 0.1 to 10 M /sq.…”

Short focal length tunable liquid crystal lenticular lens array based on fringe field effect

“…A liquid crystal (LC) microlens array is an essential electrooptical device for many applications, including image processing, [1][2][3][4][5] beam steering, 6,7 wavefront correction, 8 and 2D/3D switchable displays. [9][10][11][12] In the LC devices, LC molecules are an effective medium because its optical anisotropy and dielectric anisotropy can be varied by an electric field. 13 Because LC director's orientation is aligned along the electric field direction, light passing through the LC layer experiences a different refractive index by controlling the molecular orientation of the LC layer with an electric field; thus, a gradient refractive index (GRIN) profile can be generated, 14 which leads to a focal length tunable LC lens.…”