Interesting. Though maybe not so surprising that "multi-primary color display technology ... was presented as a key direction for the next-generation display industry" at the “Multi Primary Color Display Ecosystem Conference”.
If you’d read the article, you’d learned that these are advancements in backlit LCD technology. More generally, however, having more than three color primaries is orthogonal to the question of backlit vs. self-emissive.
Can anyone explain how this works? Humans have 3 (sometimes 4) cones, so I thought that going beyond 3 primaries wouldn't increase the perceivable gamut.
You are probably familiar with the horseshoe-shaped chromaticity diagram of human-perceptible colors. A light source with three color primaries spans a triangle. To cover the whole horseshoe, the three vertices would need to be considerably outside the horseshoe. With four color primaries, you get a quadrilateral that makes it easier to cover a larger part of the horseshoe.
I don't have an answer, I'm just wondering out loud.
Cone cell activation is complicated. Displays with three well chosen primaries are economical and effective, but they aren't intended to produce every perceivable color. And our chromaticity diagrams, that pointy splotch that's often used to compare display gamuts, is based on a "standard observer" that is a simplified model for human perception.
An ideal pixel would be able to emit any kind of electromagnetic radiation of any intensity, kind of fun to think about but unrealistic and impractical.
What additional primaries mathematically do is expand a gamut from a triangle to a convex polygon. While ten or a hundred primaries would be bonkers, I bet we could fit a quadrilateral or a pentagon to the perceivable gamut in ways that'd see some gains.
Humans can see more than the colors they can make with only combining RGB pixels; you can't make 'neon' colors with them, even though we can see them in real life, for example. Other commenters pointed to links showing the visible color gamut vs the RGB ones. Compare also with CMYK used in print, it can produce sightly different colors compared to display RGB.
Cyan is severely under-represented by monitors, so the extra pixel is a dedicated cyan. It dramatically improves the ability to display blue/green colours.
I was under the impression that yellow was a better candidate for this. But whatever. Can hardly wait for RGBCYM televisions that will make my wallet bleed.
We have a very "fuzzy" visual perception. I remember seeing an RGB response curve of the human vision mechanism once. I doubt it was measured. Maybe they extracted it from the CIELab stuff.
Anyway, things like the green (or blue -can't remember) receptor have a strong curve in the green spectrum, but also a "bump," over in red (I think).
We're an organic mess.
Looking at RGB curves for LEDs, they are three perfect little mountains. No "bumps," anywhere.
I guess that the goal is to try to mimic the "messy" human visual perception.
Also, expect these monitors to be non-cheap. Companies like Eizo are having a difficult time, justifying their prices, these days.
The cones are not sensitive to a single wavelength but to a range.
The green-sensitive cones overlap with the red-sensitive cones, and to a smaller extent also with the blue-sensitive.
Full saturation red and blue are possible by emitting light on the edges of the visible spectrum.
Full saturation green, however, also activates the red and blue cones.
To cover the whole gamut is impossible, but you can approximate it with ~three green tones: a 490nm deep cyan that hits blue and green but not red, ~510nm that hits red and blue equally, and ~540nm the peak of the green cone.
Remember that light is synthesized by combining the primaries; the spectrum is defined by their convex hull. You can expand the hull and ergo gamut by adding primaries.
The RGB setup we have strikes a balance between cost and visual quality. If the cost of adding primaries goes down you can add more to increase the quality. One issue is that the signals often assume RGB (channels), so the hardware manufacturer would have to adapt the RGB signal to their multi-primary hardware.
Remember that light is synthesized by combining the primaries; the spectrum is defined by their convex hull. You can expand the hull and ergo gamut by adding primaries.
I don't know either, but if we visualize the RGB color space as a triangle that is entirely contained within the weird shape that represents the set of all colors the human eye can perceive ( https://en.wikipedia.org/wiki/RGB_color_model#/media/File:CI... ), presumably the idea is to cover more of that human-perceived space via a quadrilateral with four anchor points rather than a triangle with three. Presumably the "C" in "RGBC" stands for cyan, and in the linked image the cyan portion of the color space is particularly poorly represented.
Interesting. Though maybe not so surprising that "multi-primary color display technology ... was presented as a key direction for the next-generation display industry" at the “Multi Primary Color Display Ecosystem Conference”.
So where does this stand in 'backlit' or 'self emmission' panels?
"TV Displays Explained at the Fundamental Level" https://www.youtube.com/watch?v=WhFwPAfwdLo
If you’d read the article, you’d learned that these are advancements in backlit LCD technology. More generally, however, having more than three color primaries is orthogonal to the question of backlit vs. self-emissive.
Can anyone explain how this works? Humans have 3 (sometimes 4) cones, so I thought that going beyond 3 primaries wouldn't increase the perceivable gamut.
You are probably familiar with the horseshoe-shaped chromaticity diagram of human-perceptible colors. A light source with three color primaries spans a triangle. To cover the whole horseshoe, the three vertices would need to be considerably outside the horseshoe. With four color primaries, you get a quadrilateral that makes it easier to cover a larger part of the horseshoe.
I don't have an answer, I'm just wondering out loud.
Cone cell activation is complicated. Displays with three well chosen primaries are economical and effective, but they aren't intended to produce every perceivable color. And our chromaticity diagrams, that pointy splotch that's often used to compare display gamuts, is based on a "standard observer" that is a simplified model for human perception.
An ideal pixel would be able to emit any kind of electromagnetic radiation of any intensity, kind of fun to think about but unrealistic and impractical.
What additional primaries mathematically do is expand a gamut from a triangle to a convex polygon. While ten or a hundred primaries would be bonkers, I bet we could fit a quadrilateral or a pentagon to the perceivable gamut in ways that'd see some gains.
Humans can see more than the colors they can make with only combining RGB pixels; you can't make 'neon' colors with them, even though we can see them in real life, for example. Other commenters pointed to links showing the visible color gamut vs the RGB ones. Compare also with CMYK used in print, it can produce sightly different colors compared to display RGB.
Cyan is severely under-represented by monitors, so the extra pixel is a dedicated cyan. It dramatically improves the ability to display blue/green colours.
*edit: found the link I was after on this: https://moultano.wordpress.com/2026/06/19/where-to-find-the-...
I was under the impression that yellow was a better candidate for this. But whatever. Can hardly wait for RGBCYM televisions that will make my wallet bleed.
We have a very "fuzzy" visual perception. I remember seeing an RGB response curve of the human vision mechanism once. I doubt it was measured. Maybe they extracted it from the CIELab stuff.
Anyway, things like the green (or blue -can't remember) receptor have a strong curve in the green spectrum, but also a "bump," over in red (I think).
We're an organic mess.
Looking at RGB curves for LEDs, they are three perfect little mountains. No "bumps," anywhere.
I guess that the goal is to try to mimic the "messy" human visual perception.
Also, expect these monitors to be non-cheap. Companies like Eizo are having a difficult time, justifying their prices, these days.
The cones are not sensitive to a single wavelength but to a range.
The green-sensitive cones overlap with the red-sensitive cones, and to a smaller extent also with the blue-sensitive.
Full saturation red and blue are possible by emitting light on the edges of the visible spectrum.
Full saturation green, however, also activates the red and blue cones.
To cover the whole gamut is impossible, but you can approximate it with ~three green tones: a 490nm deep cyan that hits blue and green but not red, ~510nm that hits red and blue equally, and ~540nm the peak of the green cone.
Remember that light is synthesized by combining the primaries; the spectrum is defined by their convex hull. You can expand the hull and ergo gamut by adding primaries.
The RGB setup we have strikes a balance between cost and visual quality. If the cost of adding primaries goes down you can add more to increase the quality. One issue is that the signals often assume RGB (channels), so the hardware manufacturer would have to adapt the RGB signal to their multi-primary hardware.
Remember that light is synthesized by combining the primaries; the spectrum is defined by their convex hull. You can expand the hull and ergo gamut by adding primaries.
I don't know either, but if we visualize the RGB color space as a triangle that is entirely contained within the weird shape that represents the set of all colors the human eye can perceive ( https://en.wikipedia.org/wiki/RGB_color_model#/media/File:CI... ), presumably the idea is to cover more of that human-perceived space via a quadrilateral with four anchor points rather than a triangle with three. Presumably the "C" in "RGBC" stands for cyan, and in the linked image the cyan portion of the color space is particularly poorly represented.
Preventing selection is quite the useless and user antagonistic pattern...
Turning off Javascript helps.
Yeah. That was crazy. I've not encountered that, before.