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Saint-Sauveur-en-Rue, France

Leroux T.,ELDIM
SID Conference Record of the International Display Research Conference | Year: 2011

In this paper, we detail the technical background of our talk and explain the technical details of the Fourier optics technology for viewing angle measurement of displays. The increasing capacities of the ELDIM systems over the years are presented with up-to-date applications. Multispectral polarization measurements for passive glass 3D TVs and ultrahigh angular resolution measurements for auto-stereoscopic 3D displays are also introduced. Source

Madsen M.H.,DFM A S | Boher P.,ELDIM | Hansen P.-E.,DFM A S | Jorgensen J.F.,Image Metrology A S
Applied Optics | Year: 2016

Fast characterization of 2D gratings is demonstrated using a Fourier lens optical system and a differential optimization algorithm. It is shown that the grating-specific parameters such as the basis vectors and the angle between them, along with the alignment of the sample, such as the rotation of the sample around the x, y, and z axis, can be deduced from a single measurement. More specifically, the lattice vectors and the angle between them have been measured, while the corrections of the alignment parameters are used to improve the quality of the measurement and, hence, reduce the measurement uncertainty. Alignment-free characterization is demonstrated on a 2D hexagonal grating with a period of 700 nm and a checkerboard grating with a pitch of 3000 nm. The method also can be used for automatic alignment and in-line characterization of gratings. © 2016 Optical Society of America. Source

Eldim | Date: 2013-05-21

Scientific, photographic, optical, measuring, signaling, checking (supervision) apparatus and instruments; apparatus for recording, transmission or reproduction of sound or images.

Leroux T.,ELDIM | Boher P.,ELDIM
Molecular Crystals and Liquid Crystals | Year: 2014

Optical characterization of all types of displays is mandatory to quantify the different imperfections and compare the different technologies. Standard characterization is focused on luminance and color measurements of the light emitted by the displays. Viewing angle measurements devoted to the angular characterization and homogeneity measurements are the most frequently used. In the present paper we demonstrate that the same type of measurements extended to the polarization analysis of the light emitted by the display can be a powerful tool in order to understand the origin of many imperfections. The present paper is composed of two main parts: first the different measurement tools for viewing angle and imaging characterization are presented and the method used to analyze the polarization state of the light is explained. The second part gives details on some examples of applications for the characterization of display components (brightness enhancement film, backlight), the measurement of the crystal cell rotation inside a standard LCD display, and the characterization of a passive 3D TV. © 2014 Taylor & Francis Group, LLC. Source

Boher P.,ELDIM | Leroux T.,ELDIM | Bignon T.,ELDIM | Blanc P.,Fnac
Journal of Information Display | Year: 2011

A complete analysis of the color-viewing-angle properties of different displays is presented herein using color-viewing-angle measurements made with a Fourier-optics system. The color gamut in the CIE u'v' chromatic plane was computed for all the viewing angles. The introduction of the lightness using the L * a * b * color space allowed a more precise analysis of the emissive properties of each display. The displays can be directly compared using a common reference. The viewing-angle dependence can be analyzed in full detail using the on-axis values as reference. The gravity center behavior and area of the color hull were computed for a more precise evaluation and comparison. © 2011 Copyright The Korean Information Display Society. Source

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