Fig 2 - uploaded by Pierre Boher
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Color gamut ratio to Rec.2020 of QLED (left) and OLED (right) displays at all angles in a*b* (top) and CtCp chromatic planes.
Source publication
High Dynamic Range (HDR) and Wide Color Gamut (WCG) displays require adapted color measurements analysis. In this paper, we evaluate the viewing angle dependence of the color gamut and color volume of two HDR/WCG displays, one QLED TV and one OLED TV measured using a Fourier optics viewing angle system. The analysis is made using L*a*b* color space...
Contexts in source publication
Context 1
... if the gamut shapes are very different for the two color spaces, the difference with the reference is comparable. The gamut ratios to Rec.2020 computed at all angles for the QLED and OLED TVs are reported in Figure 2 using the two-color spaces. The white reference used to go to the L*a*b* space is the same at all angles and the strong reduction increasing the incidence angle is mainly due to the lightness reduction. ...
Context 2
... white reference used to go to the L*a*b* space is the same at all angles and the strong reduction increasing the incidence angle is mainly due to the lightness reduction. On the contrary, one advantage of the ICtCp color space is that the CtCp values can be normalized to the XYZ maximum at all angles and the gamut behavior observed on Figure 2 is in this case only due to the color variations. The same type of property can be obtained with the u'v' color space that is naturally normalized and for this reason, commonly used for gamut evaluation. ...
Similar publications
The viewing angle emission properties of different HDR & WCG QLED and OLED TVs obtained with a Fourier optics instrument are used to compute there color gamut and color volume properties using standard color spaces and new ICtCp and Jzazbz color spaces. The advantages of the new color spaces is discussed.
Citations
... The international committee for display metrology has also standardized the method [4]. More recently we have introduced new color spaces especially developed for HDR and WCG contents and in particular the ICtCp color space recently proposed by Dolby laboratories [5] or the Jzazbz color space [6] to do the same task [7][8][9][10]. ...
Color volumes in the new color spaces ICtCp and Jzazbz are used to characterize the performances of different types of displays. The viewing angle behavior of the emissive properties of one QLED TV and one OLED TVs are measured and compared. The influence of the top polarizer on the reflective properties of one LCD vehicle display is also measured and the color performances under various parasitic illumination are predicted.
... The international committee for display metrology has also standardized the method [4]. More recently we have introduced new color spaces especially developed for HDR and WCG contents and in particular the ICtCp color space recently proposed by Dolby laboratories [5] or the Jzazbz color space [6] to do the same task [7][8][9][10]. ...
High Dynamic Range (HDR) and Wide Color Gamut (WCG) displays are now commonly available on the market of TVs. The standard color characteristics are no more adapted for this type of display. In this paper, we use the ICtCp color space recently proposed by Dolby laboratories for new HD video standards to analyze color measurements made with a Fourier optics viewing angle instrument. We evaluate the viewing angle dependence of the color gamut and color volume of two HDR/WCG displays, one QLED TV and one OLED TV. The analysis is also made using the standard L*a*b* color space. The interest of the ICtCp color space for direct comparison of the displays is discussed.
