Do QD-OLEDs Use Color Filters?

Samsung Display’s marketing materials imply that no color filters are used in their QD-OLED displays, which is not 100% true. High color gamut requires very low blue light leakage. As can be seen in the illustrations, without any color filters at all, blue light leakage will occur in the red and green channels, impacting gamut coverage. Filtering is also necessary to prevent excitation of the QDCC layer by ambient light. Consequently, Samsung Display most definitely does use filters to improve the colorimetry of their QD-OLED TVs. In the graphics, Nanosys is referring to the two‐dimensional CIE 1976 chromaticity diagram, which does not include the all-important luminance axis. Color volume includes chromaticity, hue and lightness. It’s important to distinguish between color gamut and color volume. The CIE diagrams were useful for describing SDR, but are inadequate for characterizing the performance of HDR displays. The Sony A95L and Samsung S95B manage to cover 80% of BT.2020.