Samsung Display's 'Chehwigamdo' Measurement Method Adopted as International Standard

A New Brightness Measurement Method Complementing Luminance Measurement Limits

Samsung Display's newly devised brightness measurement method has been adopted as an international standard. In the future, 'perceived luminance,' which reflects how the human eye actually perceives brightness, rather than simple luminance, is expected to become the new criterion for image quality.

Samsung Display announced on the 20th that the perceived luminance (XCR) measurement method, proposed to the international semiconductor equipment and materials association (SEMI) last year for the first time in the industry, has recently been officially established as an international standard. SEMI is an industry organization with over 2,500 semiconductor and display companies worldwide, responsible for reviewing and establishing related international standards.

The perceived luminance measurement method devised by Samsung Display explains the phenomenon where displays with the same luminance value but superior color reproduction (an indicator representing the range of colors that TVs, monitors, and cameras can express among the colors distinguishable by the human eye) appear brighter as the concept of 'perceived luminance,' and standardizes this into an objective image quality evaluation method.

Previously, display brightness performance was explained simply by 'luminance.' This method calculates how many times brighter a display is compared to a unit brightness (1 nit) when a single candle illuminates a certain area. However, even if the luminance values of two screens measured by a luminance meter are the same, there was a limitation in that the perceived brightness by the human eye could differ. This is because perceived brightness is influenced not only by luminance but also by color type and saturation.

Last year, the Munsell Color Science Laboratory at the Rochester Institute of Technology in the United States conducted research on visual perception differences arising from saturation differences. As a result, they concluded that perceived luminance, which quantifies brightness by considering saturation and color type rather than luminance alone, better reflects the characteristics of the human visual system than conventional brightness expressed only by luminance.

Since 2020, when Samsung Display began full-scale QD-OLED business, it has emphasized the need for a standard perceived luminance measurement method. Unlike conventional large displays that implement color through color filters, QD-OLED expresses various colors by fusing the strong light energy emitted from blue OLED with quantum dots (luminescent materials that express colors with high purity and accuracy). Samsung Display's QD-OLED introduced this year was measured to have the highest perceived luminance among existing OLED displays.

A Samsung Display official said, "The perceived luminance measurement method will change not only the process of designing, developing, and evaluating displays but also the standards for manufacturing and selecting electronic products," adding, "Consumers will be able to choose products with higher perceived luminance based on objective information and experience improved brightness performance in actual viewing environments."

This content was produced with the assistance of AI translation services.