A method for calculating optimal parameters of liquid chrystal displays developed at RUDN University
To reduce the impact of an angle of view on image quality, the light in displays undergoes additional processing. Only the beams that are oriented in a certain plane are chosen from a disorderly flux of light. To do so, diffraction optical elements are used. DOE are bases with surface microrelief. It is this relief that determines their optical properties, in particular, the intensity of light that goes through them. The researchers compared three surface reliefs and developed an algorithm for calculating their optical parameters. Previously, similar results had been obtained for crystals with positive optical anisotropy (a parameter that shows the movement of light beams inside a crystal). In his work, the professor from RUDN University studied DOE made of the so-called discotic liquid crystals (DLC) that have negative optical anisotropy.
“Our goal was to calculate diffraction in DOE with negative optical anisotropy. Such elements can be based on discotic liquid crystals. DOE of this type may be used to expand the angles of view of liquid crystal displays,” said Prof. Viktor Belyaev, a Ph.D. in Technical Sciences from the Department of Mechanics and Mechatronics of RUDN University.
The team used DOE with undulated and rectangular periodic profiles. In all elements, the period or waves or rectangular ridges was 2.52 um, and the width of cuts in the rectangular DOE amounted to either 0.63 or 1.25 um. The team chose these values because they were divisible by the wavelength of the incident light (0.63 um for red light). The height of the relief varied from 0.063 to 1.89 um. Using these parameters, the team calculated how the intensity of light depended on the ratio of the period to the height of relief in all three types of DOE. The new algorithm can be used to calculate the parameters of DOE based on specific display requirements.
“We have calculated the effect of the periodic profile of microrelief on diffraction parameters. The method suggested by our team helps calculate relief parameters to achieve the required properties of a spatially inhomogeneous anisotropic structure,” added Prof. Viktor Belyaev from RUDN University.
The results of the study were published in the Journal of The Society for Information Display.
RUDN mathematicians investigated the possibility of combining 5 GNR technology and WiGig — a high-frequency range that allows you to transfer data at speeds up to 10 Gbps. This will smooth traffic fluctuations in 5Gnetworks and cope with user requests.
Scientists from the Winogradsky Institute of Microbiology RAS, RUDN University, St. Petersburg State University and the Tyumen Scientific Centre SB RAS studied the microbial communities from several lakes of the Yamal Peninsula. It turned out that methanotrophs (bacteria that use methane as a source of energy) consume methane more actively in the deep mature lakes of the peninsula than in small thermokarst lakes. In this regard, methane emissions into the atmosphere from the surface of deep lakes are low, and only small (relatively younger thermokarst lakes with constitutional ground ice) can make a significant contribution to methane emissions in the north of Western Siberia. Thus, bacteria perform an important function for the climate balance — they reduce the emission of methane into the atmosphere.
RUDN University physicists have described the conditions for the most efficient operation of long mirror-based variant of cyclotron in the autoresonance mode. These data will bring better understanding of plasma processes in magnetic traps.