Size Of 90% Of Peak Highlights In Real-World Content Less Than 0.2%

Evaluation of High Dynamic Range TVs using Actual HDR Content. Sungjin Kim, Yongmin Park, Dongwoo Kang, Jongjin Park, Jangjin Yoo, Jonguk Bae and Sooyoung Yoon. LG Display Co. © 2018, Society for Imaging Science and Technology

A couple years ago, the Classy Tech Calibrations YouTube channel used the Spears & Munsil UHD disc to demonstrate that synthetic test patterns for measuring the peak luminance of displays don’t correlate with real-world content; and in fact, OLED appeared to hold up quite well against LCD.

From the very outset, it’s been a sticking point whether results obtained from measurements using artificial test patterns are consistent with the actual performance of HDR TVs. It was for this reason that researchers at LG Display compared LCD to OLED using actual HDR contents rather than artificial test patterns to measure peak luminance, black level, and EOTF accuracy. A total 34 HDR video clips encoded with the HDR10 format were used, consisting of several HDR movies from Hollywood studios, HDR test videos from Stuttgart Media University and Imagica. A 65″ OLED TV and 65″ VA LCD TV, both released in 2017 and certified as premium UHD/HDR TVs by the UHD Alliance, were used for the study.

A series of measurements were made to evaluate the performance of the two TVs in terms of peak luminance, black luminance, and EOTF accuracy using actual HDR test clips. For measuring peak luminance, it was determined to use a patch size of 0.2%, one reason being that, in a previous study by the authors, it was found that the size of 90% of peak highlights in real-world content is less than 0.2%.

The researchers concluded that, while the results of artificial test patterns for evaluating HDR TV are different from those obtained using actual HDR content, OLED TV adheres more closely to artificial test pattern measurement results in actual HDR content than does LCD TV.