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Journal articles on the topic 'RGBW LEDs'

To see the other types of publications on this topic, follow the link: RGBW LEDs.

Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Song Pengcheng, 宋鹏程, 文尚胜 Wen Shangsheng, and 陈颖聪 Chen Yingcong. "Research on Color Mixing Based on RGBW-LEDs." Acta Optica Sinica 35, no. 9 (2015): 0923004. http://dx.doi.org/10.3788/aos201535.0923004.

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2

Kalustova, D. O., V. I. Kornaga, A. V. Rybalochka, and S. I. Valyukh. "RGBW lighting systems: Influence of the white LED." Semiconductor Physics, Quantum Electronics and Optoelectronics 25, no. 1 (March 24, 2022): 76–82. http://dx.doi.org/10.15407/spqeo25.01.076.

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People spend most of the time under artificial light sources, so it is important to create a comfortable lighting environment for work and rest. Four-component RGBW systems are the most effective for this. It is needed to create methods for obtaining white light with the specified parameters and choose the most optimal LED components. In this work, the influence of the white LEDs parameters on the resulting white light of the RGBW systems is studied. Two different methods proposed by us earlier for obtaining white light are applied for three RGBW systems with different warm white LEDs. It is shown that the use of white LEDs with a colour rendering index close to 80 is more optimal for most applications. In this case, they provide the resulting white light with the colour rendering index above 90 and luminous efficacy above 130 lm/W.

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3

Rybalochka, Andrii, Vasyl Kornaga, Daria Kalustova, Vadym Mukhin, Yaroslav Kornaga, Valerii Zavgorodnii, and Sergiy Valyukh. "White Colour Hues in Displays and Lighting Systems Based on RGB and RGBW LEDs." International Journal of Image, Graphics and Signal Processing 14, no. 3 (June 8, 2022): 1–10. http://dx.doi.org/10.5815/ijigsp.2022.03.01.

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4

XIONG Chen-yu, 熊晨雨, 吴玉香 WU Yu-xiang, 李杨 LI Yang, and 文尚胜 WEN Shang-sheng. "Application of Mixed Light Optimization of RGBW-LEDs in Solar Simulation." ACTA PHOTONICA SINICA 46, no. 8 (2017): 823006. http://dx.doi.org/10.3788/gzxb20174608.0823006.

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5

Kornaga, V. I. "Color mixing models for smart lighting systems based on RGBW and WW LEDs." Semiconductor Physics Quantum Electronics and Optoelectronics 18, no. 3 (September 30, 2015): 302–8. http://dx.doi.org/10.15407/spqeo18.03.302.

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6

XIONG Chen-yu, 熊晨雨, 吴玉香 WU Yu-xiang, and 文尚胜 WEN Shang-sheng. "Research on Color Mixing and Optimization of RGBW-LEDs Based on Genetic Algorithm." Chinese Journal of Luminescence 38, no. 2 (2017): 254–65. http://dx.doi.org/10.3788/fgxb20173802.0254.

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7

Bayneva, I. I. "LED AND LIGHT TECHNOLOGIES IN DATA TRANSMISSION." Spravochnik. Inzhenernyi zhurnal, no. 292 (July 2021): 51–56. http://dx.doi.org/10.14489/hb.2021.07.pp.051-056.

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The article deals with the main issues of organizing information transmission systems using modern light technologies. An assessment of the role of LED lighting technology, in particular, LEDs, in the organization of Light Fidelity technology as an innovative technology for wireless optical data transmission is given. An urgent task is to identify the most effective LED light sources for organizing Li-Fi networks. The main provisions on the use of LED light sources for the effective operation of Li-Fi networks are given. The main characteristics and areas of application of Li-Fi technology are analyzed. Since the main component of the Li-Fi system is an LED, the main types and characteristics of modern LEDs, including super-bright LEDs, are considered. Also considered are the features and possibilities of using RGBW-LEDs as more optimal in a number of indicators for organizing Li-Fi networks.

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8

Kalustova, D., V. Kornaga, A. Rybalochka, and S. Valyukh. "Space of visual and circadian parameters of RGBW lighting systems." Lighting engineering and power engineering 1, no. 57 (April 6, 2020): 16–21. http://dx.doi.org/10.33042/2079-424x-2020-1-57-16-21.

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Due to the proven effect of light on human circadian rhythms, nowadays researchers and developers of lighting systems (LS) concentrate on the non-visual parameters of light and methods of ensuring a safe comfortable light environment. This requires optimisation of spectral power distribution (SPD). In this view the most promising and functional are RGBW systems due to their ability to change dynamically SPD and, hence, light parameters. In this work we explore two RGBW (red-greenblue-white) systems with different white LEDs (warm white and neutral white) and the space of visual and non-visual parameters that they can ensure. Visual parameters are studied in terms of colour rendering index, colour fidelity index and visual corneal illuminance while non-visual parameters are studied in terms of circadian light, circadian stimulus and circadian action factor. These parameters are calculated for different contribution of the components in a correlated colour temperature (CCT) range of 2500 – 7000K. In addition, acceptable criterion of the colour fidelity index above 85 is used. It is shown that under this condition the circadian action factor in the range of 0.33-0.98 can be obtained by changing the CCT and (or) colour fidelity index. Also an achievable area of the circadian stimulus versus corneal illuminance space for RGBW systems is found. It enables to choose optimal combination of CCT, circadian stimulus and corneal illuminance to provide the desired level of circadian effect with sufficient visual comfort depending on the daytime and field of system's implementation. This data is useful for LS manufacturers and lighting designers to create a comfortable lighting environment. Keywords - RGBW colour mixing, tunable white light, circadian effect, colour rendering, colour fidelity index.

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9

Kalustova, Daria, Vasyl Kornaga, Andrii Rybalochka, Ying-Jie Yu, and Sergiy Valyukh. "Colour temperature tunable RGBW clusters with 3 control channels." Photonics Letters of Poland 12, no. 1 (March 31, 2020): 10. http://dx.doi.org/10.4302/plp.v12i1.968.

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The work is devoted to development of a smart lighting system that is able to change correlated colour temperature and consists of tunable 4-components RGBW clusters controlled via three channels. It is shown that fixing a ratio between the intensities of white and red LEDs at a level of 100:9 enables obtaining high values of colour rendering in a wide range of correlated colour temperatures. A control of 3 from 4 channels simplifies the system. The influence of the red LED on CRI and luminous efficiency is analysed. Full Text: PDF References:J. Gooley, S. Rajaratnam, G. Brainard, R. Kronauer, C. Czeisler and S. Lockley, "Spectral Responses of the Human Circadian System Depend on the Irradiance and Duration of Exposure to Light", Sci Transl Med 2, 31 (2010) [CrossRef]A. Borisuit, F. Linhart, J. Scartexxini, M. Munch, Light Res Technol 47, 192 (2014) [CrossRef]Q. Dai, W. Cai, L. Hao, W Shi and Z. Wang, Light Res Technol 50 (8), 1198-1211 (2017), [CrossRef]V. Kornaga, V. Sorokin, A. Rybalochka, O. Oliinyk and N. Kornaga, Semicond Phys Quantum Electron Optoelectron 18, 302 (2015) [CrossRef]Illuminating Engineering Society, ANSI/IES TM-30-18 IES method for evaluating light source color rendition (2018). New York, NY[DirectLink]Commission International de l'Éclairage, CIE 224:2017 Colour fidelity index for accurate scientific use (2017). Vienna [CrossRef]V. Kornaga, D. Kalustova and O. Oliynyk, Int Sci Conf "Light and power eng: hist, probl, perspect" 6, 43 (2018) [DirectLink]

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10

Brzychczyk, Beata, Tomasz Hebda, Jakub Fitas, and Jan Giełżecki. "The Follow-up Photobioreactor Illumination System for the Cultivation of Photosynthetic Microorganisms." Energies 13, no. 5 (March 3, 2020): 1143. http://dx.doi.org/10.3390/en13051143.

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The article presents the basic conceptual assumptions of a photobioreactor with a complementary lighting system. The cylindrical bioreactor has three independent, interconnected, and fully controlled lighting systems. A characteristic feature is the combination of the lighting system with the measurement of photosynthetically active PAR (photosynthetically active radiation) and the optical density of the culture medium. The entire lighting system is based on RGBW (“red, green, blue, white”) LED and RBG (“red, green, blue”) LEDs. The pilot study was conducted on a simplified prototype of a photobioreactor designed for the distribution and optimization of light in algae cultures designed for energy purposes. The study was carried out on microalgae Chlorella Vulgaris BA0002a from the collection of marine algae cultures.

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11

Tsai, Chi-Chu, Fang-Cheng Lin, Yi-Pai Huang, and Han-Ping D. Shieh. "29.3: RGBW 4-in-1 LEDs for Backlight System for Ultra-Low Power Consumption Field-Sequential-Color LCDs." SID Symposium Digest of Technical Papers 41, no. 1 (2010): 420. http://dx.doi.org/10.1889/1.3500479.

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12

Serôdio, João, William Schmidt, Jörg C. Frommlet, Gregor Christa, and Matthew R. Nitschke. "An LED-based multi-actinic illumination system for the high throughput study of photosynthetic light responses." PeerJ 6 (September 4, 2018): e5589. http://dx.doi.org/10.7717/peerj.5589.

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The responses of photosynthetic organisms to light stress are of interest for both fundamental and applied research. Functional traits related to the photoinhibition, the light-induced loss of photosynthetic efficiency, are particularly interesting as this process is a key limiting factor of photosynthetic productivity in algae and plants. The quantitative characterization of light responses is often time-consuming and calls for cost-effective high throughput approaches that enable the fast screening of multiple samples. Here we present a novel illumination system based on the concept of ‘multi-actinic imaging’ of in vivo chlorophyll fluorescence. The system is based on the combination of an array of individually addressable low power RGBW LEDs and custom-designed well plates, allowing for the independent illumination of 64 samples through the digital manipulation of both exposure duration and light intensity. The illumination system is inexpensive and easily fabricated, based on open source electronics, off-the-shelf components, and 3D-printed parts, and is optimized for imaging of chlorophyll fluorescence. The high-throughput potential of the system is illustrated by assessing the functional diversity in light responses of marine macroalgal species, through the fast and simultaneous determination of kinetic parameters characterizing the response to light stress of multiple samples. Although the presented illumination system was primarily designed for the measurement of phenotypic traits related to photosynthetic activity and photoinhibition, it can be potentially used for a number of alternative applications, including the measurement of chloroplast phototaxis and action spectra, or as the basis for microphotobioreactors.

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13

Kusznier, Jacek, and Wojciech Wojtkowski. "Spectral properties of smart LED lamps." Photonics Letters of Poland 12, no. 1 (March 31, 2020): 16. http://dx.doi.org/10.4302/plp.v12i1.978.

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Intelligent LED lamps are most often used in intelligent lighting installations. They frequently use one of two different ways to obtain white light. The first is the mixing of monochrome lights R, G and B. The second way is to mix the light of the blue diode with the yellow phosphor radiation. Adjusting the luminous flux in RGBW LED lamps causes greater changes in the position of the chromaticity point than in the case of CW WW LED lamps. In the case of big changes, this can lead to a visible change in the perceived color. Full Text: PDF References:https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html [DirectLink]https://dateandtime.info/pl [DirectLink]J. Kusznier and W. Wojtkowski, "Impact of climatic conditions on PV panels operation in a photovoltaic power plant," IEEE, 2019 15th Selected Issues of Electrical Engineering and Electronics (WZEE), Zakopane, Poland, 2019, pp. 1-6 [CrossRef]J. Kusznier and W. Wojtkowski, "Impact of climatic conditions and solar exposure on the aging of PV panels," IEEE, 2019 15th Selected Issues of Electrical Engineering and Electronics (WZEE), Zakopane, Poland, 2019, pp. 1-6 [CrossRef]https://www.weatheronline.pl/weather/ [CrossRef]L.T. Sharpe, A. Jagla, W. Jägle, "A luminous efficiency function, V*(λ), for daylight adaptation", J. Vision 5(11), 948 (2012) [CrossRef]http://www.ee.co.za/article/integrating-sphere-data-sincere.html [DirectLink]Simunovic M. P., "On Seeing Yellow The Case for, and Against, Short-Wavelength Light-Absorbing Intraocular Lenses", Archives of Ophthalmology, vol. 130, no. 7, pp. 919-926, 2012 [CrossRef]I. Fryc, "Important parameters of multichannel spectroradiometer", Przeglad Elektrotechniczny R. 88(4a), pp. 230-231 (2012) [DirectLink]I. Fryc, "Measurement techniques of optical LEDs properties performed with compliance conformity with CIE 127:2007 standard", Przeglad Elektrotechniczny R. 85(11), pp. 317-319 (2009) [CrossRef]J. Kowalska, I. Fryc, "Colour rendition quality of typical fluorescent lamps determined by CIE Colour Fidelity Index and Colour Rendering Index", Przeglad Elektrotechniczny R. 95(7), pp. 94-97 (2019) [CrossRef]M. Gilewski, L. Gryko, A. Zajac, "Digital controlling system to the set of high power LEDs", Proc. of SPIE, 8902, 89021D, 2013 [CrossRef]M. Gilewski, "The ecological hazard of artificial lighting in greenhouses" Photonics Letters of Poland, vol. 11 Issue: 3 Pages: 87-89, 2019 [CrossRef]I. Fryc and T. Dimitrova-Grekow, "An automated system for evaluation of the quality of light sources," 2016 IEEE Lighting Conference of the Visegrad Countries (Lumen V4), Karpacz, 2016, pp. 1-4. [CrossRef]I. Fryc, "The spectral power distribution of LED driven by square shape pulses", Przeglad Elektrotechniczny R. 88(6), pp. 131-133 (2012) [DirectLink]I. Fryc, "LED's spectral power distribution under different condition of operating temperature and driving current", Przeglad Elektrotechniczny R. 86(10), pp. 187-189 (2010) [DirectLink]J. Kusznier, "Changes in the Spectral Power Distribution of Light Sources for Smart Lighting," IEEE, 2018 14th Selected Issues of Electrical Engineering and Electronics (WZEE), Szczecin, Poland, 2018, pp. 1-5 [CrossRef]

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14

Supronowicz, Robert, and Irena Fryc. "Urban park lighting as a source of botanical light pollution." Photonics Letters of Poland 11, no. 3 (September 30, 2019): 90. http://dx.doi.org/10.4302/plp.v11i3.935.

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In this paper we are focusing on analysis of spectral power distribution (SPD) LED's lamp impact on botanical light pollution, described in relation to full moon light. We introduced new index RMPI which is called Photosynthesis Index in Relation to Moon. We found that in the case when lighting are realized by using LED luminaires instead of high pressure sodium (HPS) or metal halide (MH) lamps, light influence on plant vegetation process amplifies. Additionally our research shows that lamp's CCT is not a sufficient indicator of botanical light pollution and only SPD should be used for this purpose. Full Text: PDF ReferencesP. Tabaka, I. Fryc, Landscape Lighting as a Source of Light Pollution - the Effect of the Seasons on this Phenomenon, Lighting Conference of the Visegrad Countries, Lumen V4, 10.1109/LUMENV.2016.7745541 (IEEE 2016) CrossRef I. Fryc, F. Bisegna, P. Tabaka, Lighting on Recreation Grounds as a Source of Sky Glow - the Influence of Luminaire Type on this Phenomenon, Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) 2017 IEEE International Conference, doi: 10.1109/EEEIC.2017.7977724, (IEEE 2017) CrossRef I. Fryc, P. Tabaka, Zanieczyszczenie Nocnego Nieboskłonu Światłem Emitowanym Przez Oprawy Oświetlenia Zewnętrznego, Przeglad Elektrotechniczny R. 93, No 6, doi: 10.15199/48.2017.06.1, (2017) CrossRef H.E. Schwarz, et al, Light Pollution: The Global View, ISBN 978-94-017-0125-9, (2003) DirectLink M. Aube, J. Roby, M. Kocifaj, Evaluating Potential Spectral Impacts of Various Artificial Lights on Melatonin Suppression, Photosynthesis, and Star Visibility, PLoS One CrossRef M. S. Sankhla, K. Sharma, R. Kumar, Impacts on Human & Environment of Night Time Galore International Journal of Applied Sciences and Humanities, Issue: 2; Vol. 3 (2019) CrossRef M. Tanaka, T. Horiuchi, S. Tominaga, Color Control of a Lighting System Using RGBW LEDs, Color Imaging XVI: Displaying, Processing, Hardcopy, and Applications, 78660W) CrossRef M. Mottus et al, Photosynthetically Active Radiation: Measurement and Modeling, Encyclopedia of Sustainability Science and Technology (2011) CrossRef J. Li, G. Li, H. Wang, X. W. Deng, "Phytochrome Signaling Mechanisms" The Arabidopsis Book Vol. 9, e0148 (2011) CrossRef J.B. Clark, G.R. Lister, Photosynthetic Action Spectra of Trees: I. Comparative Photosynthetic Action Spectra of One Deciduous and Four Coniferous Tree Species as Related to Photorespiration and Pigment Compements, Plant Physiol., NCBI 401-6 (1975) CrossRef DIN 5031-10, Optical radiation physics and illuminating engineering - Part 10: Photobiologically effective radiation, quantities, symbols and action spectra (2018) DirectLink C. ChiLing et al, Effect of Night Illumination on Growth and Yield of Soybean, Journal of Taiwan Agricultural Research, Vol.58 No.2, (2009) DirectLink J. Bennie et al, Ecological Effects of Artificial Light as Night on Wild Plants, Journal of Ecology, https://doi.org/10.1111/1365-2745.12551 (2016) CrossRef W.R. Chaney, Does Night Lighting Harm Trees? Circular FNR-FAQ-17 ( 2002) DirectLink

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15

Sim, Yun-Ju, In-Tae Kim, and An-Seop Choi. "The Subjective Evaluation on White Light Property and Color Appearance of Single Chip LED and RGB Multi Chip LED." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 29, no. 1 (January 31, 2015): 1–8. http://dx.doi.org/10.5207/jieie.2015.29.1.001.

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16

Lim, Sung-Joon, and Sung-Kwun Oh. "Design of RBFNN-based Emotional Lighting System Using RGBW LED." Transactions of The Korean Institute of Electrical Engineers 62, no. 5 (May 1, 2013): 696–704. http://dx.doi.org/10.5370/kiee.2013.62.5.696.

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17

T. N. Ghorude, T. N. Ghorude, and A. D. Shaligram A. D. Shaligram. "Microcontroller Based Color Measurement Using Rgb Leds." International Journal of Scientific Research 1, no. 3 (June 1, 2012): 93–95. http://dx.doi.org/10.15373/22778179/aug2012/35.

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18

Csuti, P., and J. Schanda. "Colour matching experiments with RGB-LEDs." Color Research & Application 33, no. 2 (2008): 108–12. http://dx.doi.org/10.1002/col.20385.

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19

Oh, Sung-Kwun, Sung-Joon Lim, Chang-Min Ma, and Jin-Yul Kim. "Development of RGBW Dimming Control Sensitivity Lighting System based on the Intelligence Algorithm." Journal of Korean Institute of Intelligent Systems 21, no. 3 (June 25, 2011): 359–64. http://dx.doi.org/10.5391/jkiis.2011.21.3.359.

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20

Vaccari, S., M. Meneghini, A. Griffoni, D. Barbisan, M. Barbato, S. Carraro, M. La Grassa, G. Meneghesso, and E. Zanoni. "ESD characterization of multi-chip RGB LEDs." Microelectronics Reliability 53, no. 9-11 (September 2013): 1510–13. http://dx.doi.org/10.1016/j.microrel.2013.07.049.

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21

Li, Lizhu, Guo Tang, Zhao Shi, He Ding, Changbo Liu, Dali Cheng, Qianyi Zhang, et al. "Transfer-printed, tandem microscale light-emitting diodes for full-color displays." Proceedings of the National Academy of Sciences 118, no. 18 (April 26, 2021): e2023436118. http://dx.doi.org/10.1073/pnas.2023436118.

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Inorganic semiconductor-based microscale light-emitting diodes (micro-LEDs) have been widely considered the key solution to next-generation, ubiquitous lighting and display systems, with their efficiency, brightness, contrast, stability, and dynamic response superior to liquid crystal or organic-based counterparts. However, the reduction of micro-LED sizes leads to the deteriorated device performance and increased difficulties in manufacturing. Here, we report a tandem device scheme based on stacked red, green, and blue (RGB) micro-LEDs, for the realization of full-color lighting and displays. Thin-film micro-LEDs (size ∼100 μm, thickness ∼5 μm) based on III–V compound semiconductors are vertically assembled via epitaxial liftoff and transfer printing. A thin-film dielectric-based optical filter serves as a wavelength-selective interface for performance enhancement. Furthermore, we prototype arrays of tandem RGB micro-LEDs and demonstrate display capabilities. These materials and device strategies provide a viable path to advanced lighting and display systems.

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22

Muramoto, Yoshihiko, Masahiro Kimura, Akihiko Dempo, Suguru Nouda, Yuuya Fukawa, and Shiro Sakai. "High-efficiency UV LEDs and RGB white LEDs for lighting and LCD backlights." Journal of the Society for Information Display 19, no. 12 (2011): 907. http://dx.doi.org/10.1889/jsid19.12.907.

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23

Dotto Vizzotto, William, Guilherme Gindri Pereira, Odirlan Iaronka, Vitor Cristiano Bender, Marco Antônio Dalla Costa, Tiago Bandeira Marchesan, and Elvo Calixto Burini Junior. "Electrothermal Characterization Applied To The Study Of Chromaticity Coordinates In Rgb Leds." Eletrônica de Potência 18, no. 3 (August 1, 2013): 1091–99. http://dx.doi.org/10.18618/rep.2013.3.10911099.

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24

Sun, Da, Yue Gang Fu, Jing Yuan Duan, and An Cun Shi. "A Novel Receiver in Visible Light Communication Based on RGB LEDs." Applied Mechanics and Materials 543-547 (March 2014): 2283–87. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2283.

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In this paper, we demonstrate a novel receiver in visible light communication system based on RGB LEDs. It contains three major parts the collimating lens, the spectro-device and the photodetector. The mixed RGB signal lights are captured, separated and received by the collimating lens the spectro-device and the photodetector respectively. Through the adjustment of the collimating lens, the receiver can receive enough light even if the distance between the signal light source and the receiver is changed. The receiver has the advantages of strong mobility and strong ability of receiving signal light. Based on the designed receiver the high-speed visible light communication system using RGB wavelength division multiplexing technology can have better performance.

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25

Jin, H., L. Chen, J. Li, X. An, Y. P. Wu, L. Zhu, H. Yi, and K. H. Li. "Vertically stacked RGB LEDs with optimized distributed Bragg reflectors." Optics Letters 45, no. 24 (December 9, 2020): 6671. http://dx.doi.org/10.1364/ol.408416.

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26

Wang, Hsiang-Chen, and Yung-Tsan Chen. "Optimal lighting of RGB LEDs for oral cavity detection." Optics Express 20, no. 9 (April 19, 2012): 10186. http://dx.doi.org/10.1364/oe.20.010186.

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Frieiro, J. L., C. Guillaume, J. López-Vidrier, O. Blázquez, S. González-Torres, C. Labbé, S. Hernández, X. Portier, and B. Garrido. "Toward RGB LEDs based on rare earth-doped ZnO." Nanotechnology 31, no. 46 (September 2, 2020): 465207. http://dx.doi.org/10.1088/1361-6528/abadc9.

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28

Bui, Thai-Chien, Roberto Cusani, Gaetano Scarano, and Mauro Biagi. "Metameric MIMO-OOK transmission scheme using multiple RGB LEDs." Optics Express 26, no. 11 (May 17, 2018): 14038. http://dx.doi.org/10.1364/oe.26.014038.

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29

Hung, Chih-Ching, Yan-Huei Li, and Ping-Han Yang. "Application of the Mechanism Design to Develop the RGB LEDs Color Mixing." International Journal of Photoenergy 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/876364.

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The big advantage of LED is the flexible spectral design to make white light using different color mixing schemes. Recently, the color mixing of RGB LEDs is mostly done by sealing all three chips at single package and regulated the mix ratio of these three colors to produce the color of light. And, by changing the LEDs array alignment, RGB chips can achieve overlapping colors of light and create the fun of changing colors in light mixing. Therefore, the purpose of this study is to propose an innovative technique of light mixing. By applying the mechanism design, a RGB light mixing mechanism is produced. Each of the RGB LEDs lamp-type is installed on the couple link of the three mechanisms, respectively. By driving a crank makes the couple link and an output link to produce the relative motion, this will result in the fact that the RGB lamps can project lights on the same plane in order to obtain the color mixing. Unlike mixing technique by control system, this design generates light mixing and changes of color with the synchronized driving of three mechanisms, thus achieving the dazzling perception of single-color lights or mixing of multiple colors for creating ambience of a space.

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Wenjuan, Dong, Shi Lin, Meng Shuang, Xia Lei, Zuo Hui, and Ding Guilin. "Design of stage lamp with zoom lens based on RGBW light source." Journal of Applied Optics 38, no. 5 (2017): 623–27. http://dx.doi.org/10.5768/jao201738.0505003.

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31

Su, Kang, Jing Li, Xingdong Lu, Chang Ge, and Guohong Wang. "Influence of drive current and ambient temperature on intensity and wavelength of RGB LEDs for displays." Modern Physics Letters B 32, no. 19 (July 9, 2018): 1850217. http://dx.doi.org/10.1142/s0217984918502172.

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The optical performance of RGB LEDs used in displays is highly sensitive to the drive current and ambient temperature. The emitting intensity and dominant wavelength of RGB LEDs are investigated with the various currents and temperatures, and then the relevant mathematic models are proposed and summarized. Hence, the emitting intensity and dominant wavelength of RGB LEDs under any operating condition can be known from these models.

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32

Hsiang, En-Lin, Ziqian He, Yuge Huang, Fangwang Gou, Yi-Fen Lan, and Shin-Tson Wu. "Improving the Power Efficiency of Micro-LED Displays with Optimized LED Chip Sizes." Crystals 10, no. 6 (June 8, 2020): 494. http://dx.doi.org/10.3390/cryst10060494.

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Micro-LED (light-emitting diode) is a potentially disruptive display technology, while power consumption is a critical issue for all display devices. In this paper, we develop a physical model to evaluate the power consumption of micro-LED displays under different ambient lighting conditions. Both power efficiency and ambient reflectance are investigated in two types of full color display structures: red/green/blue (RGB) micro-LEDs, and blue-LED pumped quantum dots color-conversion. For each type of display with uniform RGB chip size, our simulation results indicate that there exists an optimal LED chip size, which leads to 30–40% power saving. We then extend our model to analyze different RGB chip sizes, and find that with optimized chip sizes an additional 12% average power saving can be achieved over that with uniform chip size.

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Chang, Yun Fei, Guo Qiang Lv, and Qi Bin Feng. "A Nigh-Vision-Compatible LED Backlight for Military Applications." Solid State Phenomena 181-182 (November 2011): 225–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.181-182.225.

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This paper describes a backlight system that can not only reach high luminance but perform a wide color gamut with NVIS compatibility. The backlight consists of red (R), green (G), blue (B), and amber (A) four colors LEDs. During daytimes, RGBA LEDs are simultaneously turned on, providing more luminance and wider color gamut. When working in the night mode, the red LEDs are turned off. The simulation and practical results show that RGBA backlight present the characteristics of high luminance and wide color gamut with compatibility of night vision.

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Srividya, R., C. R. Srinivasan, and Winston Netto. "Investigations on the Optical-Electrical-Thermal Characteristics of RGB LEDs." Journal of Nano- and Electronic Physics 13, no. 3 (2021): 03013–1. http://dx.doi.org/10.21272/jnep.13(3).03013.

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ZHENG Li-li, 郑莉莉, 郭自泉 GUO Zi-quan, 严. 威. YAN Wei, 吴挺竹 WU Ting-zhu, 吕毅军 LYU Yi-jun, 高玉琳 GAO Yu-lin, 史. 园. SHI Yuan, and 陈. 忠. CHEN Zhong. "Investigation on The Circadian Action Factor of RGB White LEDs." Chinese Journal of Luminescence 37, no. 11 (2016): 1384–89. http://dx.doi.org/10.3788/fgxb20163711.1384.

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Sun, Yuechang, Lang Shi, Peng Du, Xiaoyu Zhao, and Shengjun Zhou. "Rational Distributed Bragg Reflector Design for Improving Performance of Flip-Chip Micro-LEDs." Electronics 11, no. 19 (September 23, 2022): 3030. http://dx.doi.org/10.3390/electronics11193030.

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The distributed Bragg reflector (DBR) has been widely used in flip-chip micro light-emitting diodes (micro-LEDs) because of its high reflectivity. However, the conventional double-stack DBR has a strong angular dependence and a narrow reflective bandwidth. Here, we propose a wide reflected angle Ti3O5/SiO2 DBR (WRA-DBR) for AlGaInP-based red and GaN-based green/blue flip-chip micro-LEDs (RGB flip-chip micro-LEDs) to overcome the drawbacks of the double-stack DBR. The WRA-DBR consisting of six sub-DBRs has high reflectivity within the visible light wavelength region at an incident angle of light ranging from 0° to 60°. Furthermore, the influence of the WRA-DBR and double-stack DBR on performances of RGB flip-chip micro-LEDs is numerically investigated based on the finite-difference time-domain method. Owing to higher reflectivity and less angular dependence of the WRA-DBR, the RGB flip-chip micro-LEDs with the WRA-DBR have a stronger electric field intensity in the top side in comparison with RGB flip-chip micro-LEDs with the double-stack DBR, which indicates that more photons can be extracted from micro-LEDs with the WRA-DBR.

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Kijima, Y., N. Asai, N. Kishii, and S. I. Tamura. "RGB luminescence from passive-matrix organic LED'S." IEEE Transactions on Electron Devices 44, no. 8 (1997): 1222–28. http://dx.doi.org/10.1109/16.605458.

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Viñals, Roser, Olga Muñoz, Adrián Agustín, and Josep Vidal. "Multi-User Precoder Designs for RGB Visible Light Communication Systems." Sensors 20, no. 23 (November 29, 2020): 6836. http://dx.doi.org/10.3390/s20236836.

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In this paper, we design linear precoders for the downlink of a visible light communication (VLC) system that simultaneously serves multiple users. Instead of using phosphor-coated white light-emitting diodes (PWLEDs), we focus on Red-Green-Blue light-emitting diodes (RGB-LEDs) that allow modulating three separate data streams on the three primary colors of the RGB-LEDs. For this system, we design a zero-forcing (ZF) precoder that maximizes the weighted sum rate for a multilevel pulse amplitude modulation (M-PAM). The precoding design in RGB-based systems presents some challenges due to the system constraints, such as the limited power, the non-negative amplitude constraints per light-emitting diode (LED), and the need to guarantee white light emission while transmitting with RGB-LEDs. For comparison purposes, we also consider the ZF design for a PWLED-based system and evaluate the performance of both a PWLED- and an RGB-based system.

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Ho, Shih-Jung, and Hsueh-Shih Chen. "Inverse μ-photonic crystals enhanced the features of mini-sized quantum dot LEDs." Journal of Materials Chemistry C 8, no. 13 (2020): 4309–13. http://dx.doi.org/10.1039/c9tc05434k.

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Ryu, Won Jae, and Soo Young Shin. "On Performance Improvement of Optical Camera Communication Using RGB LEDs by Applying Histogram Equalization." Journal of Korean Institute of Communications and Information Sciences 42, no. 8 (August 31, 2017): 1654–61. http://dx.doi.org/10.7840/kics.2017.42.8.1654.

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Choi, Kyungmook. "Visible Light Communication with Color and Brightness Control of RGB LEDs." ETRI Journal 35, no. 5 (October 1, 2013): 927–30. http://dx.doi.org/10.4218/etrij.13.0212.0425.

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Demirel, Ilker, and Sinan Gezici. "Distance and position estimation in visible light systems with RGB LEDs." Digital Signal Processing 123 (April 2022): 103423. http://dx.doi.org/10.1016/j.dsp.2022.103423.

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Lee, Tae-Wook, Jae-Ho Lee, Chang-Gone Kim, and Sin-Ho Kang. "An optical feedback system for local dimming backlight with RGB LEDs." IEEE Transactions on Consumer Electronics 55, no. 4 (November 2009): 2178–83. http://dx.doi.org/10.1109/tce.2009.5373785.

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Dali, Mohd Rumaizan Maidan, Aiman Shahmi Azam, Mohamad Faizal Abd Rahma, Khairul Azman Ahmad, Nor Azlan Othman, Mohd Hanapiah Abdullah, and Ahmad Fairuz Omar. "Optical absorbance of RGB LEDs in pH measurement of colorimetric solution with phenol red reagent." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 3 (September 1, 2022): 1330. http://dx.doi.org/10.11591/ijeecs.v27.i3.pp1330-1337.

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The use of red, green, and blue ( RGB ) light-emitting-diode ( LED ) is a new trend in monochromatic colorimetric sensing due to cost-effective implementation. However, the application of RGB LED in pH measurement depends on the performance of the LED colour towards the colorimetric solution of interest, hence, needs to be evaluated. This work evaluated the performance of RGB LED for pH measurement system based on colorimetric approach using phenol red as a reagent. The main objective was to identify the LED colour with the best performance in terms of signal response and a bsorbance behavior. In this work, LED and photodiode were used as optical components and NI USB DAQ with LabView as the processing software. Four samples with known pH values were prepared and tested to obtain the voltage and absorbance behavior of each LED colour. Among all, the blue LED with wavelength ranged between 450 - 495 nm showed the best sensing behavior based on its linearity and error. Both voltage response and absorbance produced linear correlation with R 2=0.883 and R 2=0.9803, respectively. The significant finding from this study is useful in selecting the best RGB LED that is suitable for colorimetric pH measurement with phenol red as its colorimetric reagent.

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Martínez-Ciro, Roger Alexander, Francisco Eugenio López-Giraldo, José Martín Luna-Rivera, and Atziry Magaly Ramírez-Aguilera. "An Indoor Visible Light Positioning System for Multi-Cell Networks." Photonics 9, no. 3 (March 1, 2022): 146. http://dx.doi.org/10.3390/photonics9030146.

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Indoor positioning systems based on visible light communication (VLC) using white light-emitting diodes (WLEDs) have been widely studied in the literature. In this paper, we present an indoor visible-light positioning (VLP) system based on red–green–blue (RGB) LEDs and a frequency division multiplexing (FDM) scheme. This system combines the functions of an FDM scheme at the transmitters (RGB LEDs) and a received signal strength (RSS) technique to estimate the receiver position. The contribution of this work is two-fold. First, a new VLP system with RGB LEDs is proposed for a multi-cell network. Here, the RGB LEDs allow the exploitation of the chromatic space to transmit the VLP information. In addition, the VLC receiver leverages the responsivity of a single photodiode for estimating the FDM signals in RGB lighting channels. A second contribution is the derivation of an expression to calculate the optical power received by the photodiode for each incident RGB light. To this end, we consider a VLC channel model that includes both line-of-sight (LOS) and non-line-of-sight (NLOS) components. The fast Fourier transform (FFT) estimates the powers and frequencies of the received FDM signal. The receiver uses these optical signal powers in the RSS-based localization application to calculate the Euclidean distances and the frequencies for the RGB LED position. Subsequently, the receiver’s location is estimated using the Euclidean distances and RGB LED positions via a trilateration algorithm. Finally, Monte Carlo simulations are performed to evaluate the error performance of the proposed VLP system in a multi-cell scenario. The results show a high positioning accuracy performance for different color points. The average positioning error for all chromatic points was less than 2.2 cm. These results suggest that the analyzed VLP system could be used in application scenarios where white light balance or luminaire color planning are also the goals.

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Zhao, Peng, Ming Lun Zhang, and Lei Lei. "Visible Light Communication System Based on RGB LEDs and Large Area Detector." Applied Mechanics and Materials 687-691 (November 2014): 3801–5. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3801.

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In this paper, a new visible light communication system is proposed replacing signal lamp system on the boat. The new visible light communication system is demonstrated in 50m including RGB LEDs, lens and large area photodiodes. 153.6kbit/s data rate is achieved with infrared codes.

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T. N. Ghorude, T. N. Ghorude, and A. D. Shaligram A. D. Shaligram. "Microcontroller Driven RGB Led System For Tristimulus Surface Colorimetry." Indian Journal of Applied Research 1, no. 5 (October 1, 2011): 81–83. http://dx.doi.org/10.15373/2249555x/feb2012/30.

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Jeong, Yeong-Cheol, Jo-Cheon Choi, and Dae-Hwan Cho. "An Implementation of the RGB Remote Controller for LED Emotion Lighting of AtoN Facilities." Journal of the Korean Society of Marine Environment and Safety 18, no. 5 (October 31, 2012): 475–80. http://dx.doi.org/10.7837/kosomes.2012.18.5.475.

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Kim, Jong-Oh, Ki-Hoon Kim, Hyeong-Seob Jo, and Uh-Chan Ryu. "A Study on Variation of S/P Ratio and CRI by Changing Spectral Characteristics of RGBY Multi-chip LEDs." Journal of the Korean Institute of Illuminating and Electrical Installation Engineers 31, no. 12 (December 31, 2017): 10–19. http://dx.doi.org/10.5207/jieie.2017.31.12.010.

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Louro, Paula. "Photodetection of modulated light of white RGB LEDs with a-SiC:H device." Advanced Materials Proceedings 3, no. 5 (May 1, 2018): 366–71. http://dx.doi.org/10.5185/amp.2018/410.

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