In 2023, Palomaki tore down a 2019 Samsung QN75Q7DRAF . He reported that the TV used a “very cheap” phosphor known as yttrium telegram number list aluminum garnet (YAG) for color conversion, which is “not very good for color gamut.”
A TV that uses quantum dots
For color conversion should produce an optical spectrogram with narrow peak widths. As quantum dot supplier Avantama explains, “a narrower bandwidth results in purer colors with a higher efficiency level, and vice versa.” In the they demand that brands optical spectrogram of the QN75Q7DRAF provided by Palomaki, you can see that the peaks are sharper and narrower when measuring the full stack of phosphor film compared to the quantum dot film alone. This helps illustrate the TV’s reliance on phosphors to enhance color .
TV manufacturers often label
Their models as QLED and believe that this allows them to charge higher prices . They are also slow to reduce the quality of quantum dots (QD) in favor calling list of different levels of phosphors, which can affect performance.
This is disappointing for buyers who trust QLED TVs for their high-end and mid-range performance. However, it is important to note that the use of phosphors in QD TVs is not always a negative factor.
There are many reasons Optical spectrogram of
Why display engineers might use phosphors in combination with quantum dots (QDs) . The presence of phosphors in a quantum dot TV does not always mean a decrease in performance. They can provide a slight increase in brightness, improve uniformity, and so on. Different types of phosphors can be used for different purposes. Phosphors are used in many high-performance displays, including flagship models.
In cases where QLED TVs don’t have significant quantum dot counts and are at the lower end of a manufacturer’s QD TV offering, “cost is certainly a driving force” for using phosphors.
Please improve testing
Why don’t TCL and Samsung provide optical spectrograms of their TVs to confirm whether color conversion actually occurs as the manufacturer claims?