The colored diodes in an OLED TV degrade over time, causing what’s called “burn-in.” And with these changes happening at different rates for the red, green, and blue diodes, the degradation affects the overall ability of a display to reproduce colors accurately as it ages and also causes “ghost” images to appear where static content is frequently displayed.Īdding QDs into the mix shifts this equation. So black pixels appear truly black, while bright pixels can be run at full power, allowing unsurpassed levels of contrast.īut there’s a drawback. In OLED displays, the red, green, and blue diodes that comprise each pixel emit light and are turned on only when they are needed. Unfortunately, that filtering process isn’t perfect, and in areas that should appear black some light gets through. The picture is created by filtering this light at the many individual pixels. In an LCD TV, the LED backlight, or at least a big section of it, is on all at once. To understand why this combination is so appealing, you have to know the basic principles behind each of these approaches to displaying a moving image. The name of the resulting hybrid is still evolving, but QD-OLED seems to make sense, so I’ll use it here, although Samsung has begun to call its version of the technology QD Display. In 2022, these two rival technologies will merge. Meanwhile, QD (quantum dot) technologies have done a lot to improve the color purity and brightness of the more wallet-friendly LCD TVs. That’s because they produce deep blacks, offer wide viewing angles, and have a broad color range. įor more than a decade now, OLED (organic light-emitting diode) displays have set the bar for screen quality, albeit at a price. It was easier than splitting an Oreo in half. While taking this thing apart was no easy task, and deconstruction cracked the screen, I was surprised at how easily the QD frontplane and the OLED backplane could be separated.This is especially dramatic with green, where “pure” green actually contains a significant amount of added red and a small amount of added blue. So the TV “compresses” the gamut in some cases by adding off-primary colors to bring its primary color points in line with more common gamuts. The bandwidth of the native QD emission is so narrow (resulting in a very wide color gamut, that is, the range of colors that can be produced, generally a good thing) that some content doesn’t know how to handle it.(The blue pixels draw their light directly from the OLED panel, the red and green pixels are lit by quantum dots.) Instead of being evenly arrayed, the green quantum dots form their own line, separate from the blue and red. Samsung used a unique pixel pattern in its new QD-OLED displays.
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