At the Los Angeles Convention Center, two 85-inch TVs sat side by side inside the Nanosys meeting room at Display Week — a yearly business-to-business convention focusing on the technology that goes into displays of all types. One TV was a mini-LED panel with super quantum dots, and the other was an RGB LED — this year’s hottest TV trend. Both TVs were showing the same content at the same time to highlight the differences between the two technologies — or more specifically, to show the potential failings of RGB LED backlights when compared to super quantum dot (SQD), which uses blue LEDs for the backlight.

I should probably mention that Nanosys made the quantum dots in the first TV.

The TV on the right, with the Nanosys super quantum dots, was labeled as the TCL X11L — the striped lower grille confirming as much — and the other was most likely the TCL RM9L. Nanosys wouldn’t confirm as much, but I’ve seen the RGB LED TVs from Hisense, Samsung, LG, and Sony in person, and it wasn’t any of those. Jeff Yurek, vice president of marketing at Nanosys, informed me that both TVs were in Filmmaker Mode and color was set to native to allow both to hit the largest gamut possible.

As a quick refresher, RGB LED TVs use red, green, and blue LEDs grouped into zones to create a colored backlight based on the image displayed on screen. Theoretically, this gives the TV more vibrant and saturated colors than mini-LED TVs like the X11L with blue backlights, without needing to rely solely on the quantum dots. The primary potential issue is that the colored light provided by the backlight will bleed into adjacent pixels or zones that differ in color, resulting in what’s called color crosstalk. Practically, this could cause the red of a bright shirt or hat to cause the skin of the wearer to have a reddish hue. And that’s exactly what this demo showed.

During the entire demonstration, the same video feed went to both TVs. One slide showed three rows: two rows of boxes with the primary and secondary colors — blue, green, red, cyan, magenta, and yellow — and the third with a thin white cross on a black background under each colored box. The top row of boxes would then alternate between a solid box and one with a white cross inside it. On the RGB LED TV, as the white cross appeared in the top row, it was easy to see the color of the area around the cross get a bit lighter and less saturated. The color crosstalk didn’t just happen within the top row of boxes; the box color from the middle row also visibly bled into the bottom row of crosses. This shows in the TVs’ BT.2020 color gamut measurements as well, with the introduction of the white cross diminishing overall BT.2020 coverage, most dramatically with the blue and green color points.

But unless you’re a measurement nerd like me, you don’t watch solid blocks of color on your TV for fun. The effect is also present with skin tones — something that, as humans, is easily noticed. Just as the color of the blocks bleeds into the white cross, so does a colored background into skin tone; still images of a woman’s face with a colored background caused her skin tone to shift toward the background color. To make sure my eye wasn’t causing the color bleed, as opposed to the TV, I used a scope to focus just a portion of the woman’s face, blocking out the rest from my view. I could still tell which background color was displayed by the change in hue of her skin.

The SQD TV did not exhibit any color crosstalk. It also had better contrast, which comes down to the number of dimming zones. The X11L is advertised as having up to 20,000 dining zones, although according to Rtings, the 85-inch model has 14,400 — still an impressive number. The RGB LED TV used in this comparison has, I was told, around 8,000 dimming zones. One reason the number is lower is because each dimming zone on an RGB TV, at a minimum, needs to have three LEDs — a red, a green, and a blue — and those take up space. But when the backlight is composed of only blue LEDs, a single LED can be a dimming zone, giving much finer control.

All of this is perceptible in actual content. During an action scene with quick movement and fast cuts, I could still pick out differences as bright colors affected those surrounding them, particularly with skin tones. And in night scenes, the contrast difference was notable. If the RGB LED TV was in the room by itself, without the SQD TV for comparison, I don’t think the color crosstalk would look as glaring. Our eyes can adjust quickly to visual issues, and we stop noticing them. But taking away the comparison doesn’t take away the problem.

This isn’t brand-new information. Industry experts have been concerned about the potential for color crosstalk in RGB LED TVs since the technology debuted at CES 2025. Those concerns have grown as more RGB LED TVs arrive on the market this year. LG Display, notably a maker of OLED panels which are in direct competition with RGB LED, produced videos a few weeks before this year’s CES, highlighting the problems.

Of course, both Nanosys and LG Display have vested interests in downplaying RGB TV tech. The performance of one RGB LED TV also doesn’t tell the story for all RGB LED TVs. I didn’t notice any crosstalk issues when I reviewed the Hisense UR9, although the more I see other RGB LED TVs, the more I think the Hisense may be bypassing the issue and falling back to white backlighting, not RGB, whenever there were a lot of colors on screen. Also the processing capabilities of the upcoming Sony RGB LED TVs could make color crosstalk a nonissue on those sets. And we’re still right at the beginning of the RGB LED TV story. As the technology continues to develop and refine, these issues should be mitigated. But for 2026, SQD at least looks to have the upper hand.