TCL’s German QLED ban puts pressure on TV brands to be more honest about QDs

“Some products marketed as ‘QLED’ use conventional backlight architectures (standard phosphors, optical films, diffuser plates) and rely on picture modes or software settings to create a more saturated ‘vivid’ appearance,” he said in January. technical document by TÜV Rheinland and QD supplier Nanosys. The whitepaper, “Redefining a ‘true’ quantum dot display,” also notes devices that have QD material at “trace levels, or in packaging and integration designs that limit the excitation and extraction of light of certain wavelengths.”

“In these cases, the display can still achieve competitive core gamut coverage, but the measurable optical signature of an effective QD system is absent or minimal,” the whitepaper says. “The spectrum, color, volume behavior at high luminance, chromaticity stability and temporal response can remain similar to QD-free LCD solutions.”

For now, the German ruling raises necessary scrutiny on “QLED” and other potentially misleading display terms.

A clear understanding of what constitutes QD displays is also essential for QD-OLED displays and will only become more important if it is true. quantum dot electroluminescent the screens ever take off. (These displays, which use non-backlit technology, are also known as QDEL or QD-LED.)

“A quantum dot display should be defined by a combination of measurable material concentration and TV performance results in terms of color purity, color gamut, etc. Ideally, in a way that is understandable to consumers,” Virey said.

The white paper from TÜV Rheinland and Nanosys argues that QD displays must meet certain performance requirements that go beyond the color gamut: “The display must offer the optical advantages associated with quantum dots, including spectral precision, tunability and stability, improved color accuracy performance across the entire luminance (not just a single 2D gamut number), and, where applicable, temporal performance under backlight modulation.”

Since TV marketing remains murky (and often misleading), delving into detailed performance reviews remains the most reliable way to evaluate how a display might perform in the real world.