Additive colour mixing by surface relief gratings utilizing the power spectrum of a fluorescent lamp

Tossavainen, Noora; Orava, Joni; Laakkonen, Pasi; Kuittinen, Markku; Jääskeläinen, Timo

doi:10.1080/09500340600578344

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Red, green, and blue primary gratings were exactly the same as in reference. 2 The master plate for the primary gratings was fabricated using electron beam lithography. Nickel shim was fabricated from the master plate by our nickel electroplating system.…”

Section: Methodsmentioning

confidence: 99%

“…Thus light can be dispersed into a spectrum, where diffraction angle depends on the relation of wavelength and grating period. 2,3 By utilizing gratings on a surface very pure colors can be created, especially, if a light source has a discrete spectrum, as do fluorescent lamps. If a proper grating period is selected, certain wavelength will reflect (or transmit) to the desired angle which is given by the grating Eq.…”

Section: Introductionmentioning

confidence: 99%

“…1 The principles of additive color mixing with diffraction gratings using three primary colors was recently presented in literature by our team. 2 It is well known that periodic microstructures (i.e., diffractive gratings) diffract light. Thus light can be dispersed into a spectrum, where diffraction angle depends on the relation of wavelength and grating period.…”

Section: Introductionmentioning

confidence: 99%

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Diffractive CIE 1931 chromaticity diagram

Orava¹,

Jääskeläinen

Parkkinen

et al. 2007

Color Research & Application

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A novel diffractive CIE 1931 chromaticity diagram is generated by utilizing surface relief gratings on a plastic sample. A properly illuminated sample is shown to reflect the CIE chromaticity diagram with exact colors and large gamut. Additive color mixing is accomplished by utilizing the four main peaks of a 4000 K fluorescent lamp's spectrum as the primary colors. The primary grating units are reflecting the combination of the primary colors to the desired viewing angle and thereby forming the correct chromaticity (x, y) at each pixel of chromaticity diagram. Weights of primary colors at each pixel of the diagram are controlled by fixing the relative areas of the primary gratings. The master grating is fabricated with aid of electron beam lithography. The final grating is hot embossed on a polycarbonate sample using an electroplated nickel shim. Chromaticity values are measured from the plastic sample by a spectroradiometer.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diffractive CIE 1931 chromaticity diagram

Orava¹,

Jääskeläinen

Parkkinen

et al. 2007

Color Research & Application

Self Cite

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A Color-Mixing Setup for a Physics Teaching Laboratory

Dai

Wang

Zhang

et al. 2022

The Physics Teacher

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In this paper, an experimental setup composed of a color-mixing device, power supply, and spectrometer is developed. This setup is available for students to do hands-on color mixing with red, green, and blue light in undergraduate labs. LED volt-ampere and spectrum characteristics are investigated. The apparatus was used to perform additive color mixing, and visual colorimetric parameters such as color coordinates, dominant wavelength, and color purity were obtained. This will help students understand the physics of LEDs and chromaticity. In addition, this experiment is useful in introducing topics such as the CIE chromaticity diagram and human perception of colors.

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Diffractive parameric colors

et al. 2008

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A method of producing inkless parameric color pairs is studied. In this method, colors are formed additively using diffraction gratings with differing grating periods as primary colors. Gratings with different grating periods reflect different spectral radiance peaks of a fluorescent lamp to the desired viewing angle, according to the grating equation. Four spectral peaks of a 4000 K fluorescent lamp--red, green, cyan, and blue-are used as the primary colors. The colors are mixed additively by fixing the relative areas of different grating periods inside a pixel. With four primary colors it is possible to mix certain colors with different triplets of primary colors. Thus, it is theoretically possible to produce metameric colors. In this study, three parameric color pairs are fabricated using electron beam lithography, electroplating, and hot embossing. The radiance spectra of the color pairs are measured by spectroradiometer from hot-embossed plastic samples. The CIELAB DeltaE(ab) and CIEDE2000 color differences between radiance spectra of the color pairs are calculated. The CIEDE2000 color differences of color pairs are between 2.6 and 7.2 units in reference viewing conditions. The effects of viewing angle and different light sources are also evaluated. It is found that both the viewing angle and the light source have very strong influences on the color differences of the color pairs.

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Additive colour mixing by surface relief gratings utilizing the power spectrum of a fluorescent lamp

Cited by 3 publications

References 3 publications

Diffractive CIE 1931 chromaticity diagram

Diffractive CIE 1931 chromaticity diagram

A Color-Mixing Setup for a Physics Teaching Laboratory

Diffractive parameric colors

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