Metric of color-space coverage for wide-gamut displays

Masaoka, Kenichiro; Nishida, Yukihiro

doi:10.1364/oe.23.007802

Cited by 46 publications

(36 citation statements)

References 7 publications

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“…Higher correlations between the Rec. 2020 volume‐coverage ratios and the area‐coverage ratios in the xy diagram than between the same volume‐coverage ratios and the area‐coverage ratios in the u ′ v ′ diagram were also observed in the CIELUV L * u * v * space ( r = 0.985 for xy , r = 0.849 for u ′ v ′) and CIECAM02 Ja C b C space ( r = 0.969 for xy , r = 0.805 for u ′ v ′) . Furthermore, higher correlations were also found between the Rec.…”

Section: Discussionmentioning

confidence: 67%

“…2020, Adobe RGB, DCI‐P3, and Rec. 709), yielding 11,880 different RGB primary sets in total . Note that the boundaries of the sample areas are not exhaustive in the definition of the wide gamut.…”

Section: Simulationmentioning

confidence: 99%

“…From the point of view of source color reproduction accuracy, the coverage ratio (rather than the size ratio) is valid. Regarding planimetry using the two different chromaticity diagrams, Masaoka and Nishida used a heuristic approach to compare the Rec. 2020 area‐coverage ratios in the xy and u ′ v ′ diagrams to the Rec.…”

Section: Introductionmentioning

confidence: 99%

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Single display gamut size metric

Masaoka¹

2016

J Soc Info Display

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-To measure the relative gamut sizes of wide-gamut displays, it is herein proposed that the CIE 1931 xy chromaticity diagram be used rather than the nominally perceptually uniform CIE 1976 u′v′ chromaticity diagram. High correlations were found between the area-coverage ratios in the xy diagram and the volume-coverage ratios in the CIE 1976 L * a * b * color space for major standard wide-gamut color spaces. It is also demonstrated herein that performing planimetry in the uniform u′v′ diagram does not yield accurate relative display gamut sizes, even though the large sizes obtained using the u′v′ diagram are often reported regardless of the fact that its uniformity is valid only when the luminance factor is constant. The single display gamut size metric using the xy diagram will facilitate the unbiased development of wide-gamut displays.

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Section: Discussionmentioning

confidence: 67%

Section: Simulationmentioning

confidence: 99%

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Single display gamut size metric

Masaoka¹

2016

J Soc Info Display

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“…Masaoka and Nishida found that the xy chromaticity areas for additive RGB displays were highly correlated with the 3D CGVs expressed in any of the CIE appearance spaces, including CIELAB, CIELUV (notwithstanding the u′v′ coordinates being precursors of the u*v* coordinates), and CIECAM02. In these color appearance models, the chroma increases as the lightness increases, and it was accidentally found that enlarged yellow and green regions in the xy diagram are suitable for use as a CGV metric .…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the u′v′ chromaticity areas do not exhibit any significant correlation with the 3D CGVs in any color appearance space. Although the u′v′ diagram has gained popularity among display engineers and color scientists for measuring the chromaticity gamut area (often inappropriately referred to as color gamut), owing to its nominal uniformity, we cannot ignore the fact that the u′v′ area ratio to a reference color space, such as sRGB, is usually larger than the xy area ratio …”

Section: Introductionmentioning

confidence: 99%

Analysis of color volume of multi‐chromatic displays using gamut rings

Masaoka¹,

Jiang

Fairchild

et al. 2019

J Soc Info Display

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There are claims that multi‐chromatic displays can achieve a wider color gamut by the use of additional highly saturated secondary color channels. However, there are other claims that these displays lose lightness and/or color saturation at brighter levels. These apparently divergent views have led to some controversy in the display industry and at standard setting organizations. This study examines the color gamut volume for a variety of simulated and measured multi‐chromatic (sometimes incorrectly referred to as “multi‐primary”) displays using combinations of white and/or secondary color channels, such as cyan, magenta, and yellow. Furthermore, a two‐dimensional gamut representation, referred to as “gamut rings,” is introduced to illustrate that the addition of nonprimary optical color channels to a trichromatic (RGB) display can result in a significant decrease in the chroma at higher lightness levels. The additional saturated color channels can increase the gamut volume only around their hues at darker levels. The results also confirm the validity of comparing the color light output and white light output for revealing the design trade‐offs between the high‐peak white and the color‐image brightness for multi‐chromatic displays.

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Quantum Dot‐in‐Mechanoluminescent Matrix for Full‐Color Implementation

Jeong

Yang

Jeong

et al. 2022

Advanced Optical Materials

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the piezoelectric effect and induced by mechanical vibration. [1][2][3][4] Recently, it has been rapidly attracting the attention of researchers, because of its promising potential toward sustainable energy-saving technologies including self-driven electronics and power-less displays. [5,6] Generally, a composite structure has been adopted in which ML-active materials such as zinc sulfide (ZnS) microparticle (MP) phosphors are embedded into elastic polymer matrices such as polydimethylsiloxane (PDMS), denoted as a classical ML matrix (CMM), to effectively utilize the novel light-emitting properties with sufficient reproducibility and durability. [7][8][9] Because of its simplicity in processing, the CMM has, indeed, readily enabled a wide range of next-generation applications directed with ubiquitous electronics such as pressure-sensitive light-emitting devices, [10][11][12] skin-motion sensors, [13] selflighting fabrics and displays. [14][15][16] For lighting and imaging applications, demonstration of primary colors-red (R), green (G), and blue (B)-with high spectral accuracy (peak wavelength position) and purity (full-width at half-maximum (FWHM)) is a key point as their appropriate combinations for full-color implementation, including white (W) light. Significant advances and scientific backgrounds regarding the realization of full-color light have been established in the electroluminescent device platform, attributed to the development of pure R/G/B color emitters. [17,18] Targeted to a high-quality full-color implementation in the ML system, by employing the key principles learned from the electroluminescent systems, recent endeavors have demonstrated a color gamut from pale G to orange in the CMM platform using spectrally color-pure ML-active materials. [12,16] Nevertheless, the full-color implementation of ML, even in the recent ML technology, still lags far behind. This is attributed to the intrinsic limitation of the MLactive materials, in which the emission characteristics (particularly, the peak wavelengths and the FWHMs in ML spectra) and colors are largely determined by the metal ion dopants. In addition, the doping process of the materials usually requires elevated temperature and/or reactive atmosphere, further disrupting the research toward full-color demonstration more challenging. [19][20][21] To challenge the inherent drawbacks of the CMM-based platform and toward the realization of pure-and full-color

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Metric of color-space coverage for wide-gamut displays

Cited by 46 publications

References 7 publications

Single display gamut size metric

Single display gamut size metric

Analysis of color volume of multi‐chromatic displays using gamut rings

Quantum Dot‐in‐Mechanoluminescent Matrix for Full‐Color Implementation

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