Andrii Rybalochka

Work place: National Academy of Sciences of Ukraine / V.E. Lashkaryov Institute of Semiconductor Physics, Kyiv, Ukraine



Research Interests: Engineering, Electrical Engineering, Electronic Engineering


Andrii Rybalochka received his PhD from V. Lashkaryov Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine (ISP NASU) in 2009. Defense of thesis “Two-levels Drive Schemes for Bistable Cholesteric Liquid Crystal Displays”, specialty – optoelectronic systems. Since 2012, he has been the head of Semiconductor Lighting Test Centre (SLTC) in ISP NASU. Since 2015, the SLTC has been an accredited conformity assessment body according to DSTU ISO/IEC 17025. In 2016, Laureate of the Ukraine State Prize in the field of science and technology for work “Energy efficient LED Lighting Systems”.
His research interests include metrology, display and lighting technologies, and physics of liquid crystals. 

Author Articles
White Colour Hues in Displays and Lighting Systems Based on RGB and RGBW LEDs

By Andrii Rybalochka Vasyl Kornaga Daria Kalustova Vadym Mukhin Yaroslav Kornaga Valerii Zavgorodnii Sergiy Valyukh

DOI:, Pub. Date: 8 Jun. 2022

In this paper, aspects of obtaining white colour hues for displays/monitors and lighting by using three- and four-components LED systems are discussed. Photometric equipment developed by us for multichannel LEDs control is used in an experimental study to verify theoretical calculations. Three-component RGB and four-component RGBW LED systems, which utilise the same RGB light sources and two white LEDs with warm and cold hues, are investigated. Results of testing of luminous efficacy of such systems at different values of light intensity and comparison of the corresponding circadian action factor as the value of impact of summarized RGB and RGBW white light on human circadian rhythms are presented. It is demonstrated that the four-component RGBW LED systems are more preferable for lighting and displays than the three-components RGB LED systems, because of significant higher luminous efficacy and slightly lower circadian factor over the entire range of correlated colour temperature from 2500K to 7000K studied.

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