51–60 of 149 posts
This vaguely reminds me of "CCSTN" (Color Coded Super Twisted Nematic) LCD displays, which were used in a few Casio calculators to produce basic colour output without the usual RGB colour filter approach. https://www.youtube.com/watch?v=quB60FmzHKQ https://web.archive.org/web/20240302185148/https://www.zephr...
A single wavelength can't reproduce all visible colors. These pixels are variable wavelength, but can only produce one at a time, so you'd still need at least 2 of these pixels to reproduce any visible color. The fundamental problem is that color space is 2D[1] (color + brightness is 3D, hence 3 subpixel on traditional displays), but monochromatic light has only 1 dimension to vary for color. [1]: https://en.wikipedi…
A single wavelength can't reproduce all visible colors. These pixels are variable wavelength, but can only produce one at a time, so you'd still need at least 2 of these pixels to reproduce any visible color. The fundamental problem is that color space is 2D[1] (color + brightness is 3D, hence 3 subpixel on traditional displays), but monochromatic light has only 1 dimension to vary for color. [1]: https://en.wikipedi…
Relatedly, the page talks a lot about pixel density, but this confused me: if you swap each R, G, or B LED with an adjustable LED, you naively get a one-time 3x boost in pixel area density, which is a one-time sqrt(3)=1.73x boost in linear resolution. So I think density is really a red herring.
But they also mention mass transfer ("positioning of the red, green and blue chips to form a full-colour pixel") which plausibly is a much bigger effect: If you replace a process that needs to delicately interweave 3 distinct parts with one that lays down a grid of identical (but individually controllable) parts, you potentially get a much bigger manufacturing efficiency improvement that could go way beyond 3x. I think that's probably the better sales pitch.
Not quite vector display, but some thing organic than can be adressed with some stimulators like reaction-diffusion or gaussian, FFT, laplacians, gabor filters, Turig patterns, etc. Get fancy patterns with lowest amount of data.
https://www.sciencedirect.com/science/article/pii/S092547739... https://onlinelibrary.wiley.com/doi/10.1111/j.1755-148X.2010...
A single wavelength can't reproduce all visible colors. These pixels are variable wavelength, but can only produce one at a time, so you'd still need at least 2 of these pixels to reproduce any visible color. The fundamental problem is that color space is 2D[1] (color + brightness is 3D, hence 3 subpixel on traditional displays), but monochromatic light has only 1 dimension to vary for color. [1]: https://en.wikipedi…
It can produce all the colors of the rainbow. But no magenta. Perhaps they can quickly pulse the LED enough between multiple wavelengths.
This reminds me of the observation I had in high school that I could immerse LEDs in liquid nitrogen and run them at higher than usual voltage and watch the color change.
I got a PhD in condensed matter physics later on but never got a really good understanding of the phenomenon but I think it has something to do with
https://www.digikey.com/en/articles/identifying-the-causes-o...
Here is a video of people doing it
A single wavelength can't reproduce all visible colors. These pixels are variable wavelength, but can only produce one at a time, so you'd still need at least 2 of these pixels to reproduce any visible color. The fundamental problem is that color space is 2D[1] (color + brightness is 3D, hence 3 subpixel on traditional displays), but monochromatic light has only 1 dimension to vary for color. [1]: https://en.wikipedi…
It can produce all the colors of the rainbow. But no magenta. Perhaps they can quickly pulse the LED enough between multiple wavelengths.
https://upload.wikimedia.org/wikipedia/commons/b/ba/Planckia...
I didn't realize we even had a discrete LED tunable across the visible spectrum, let alone a Micro-LED array of them. Anybody know where I can buy one? I want to build a hyperspectral imager.
Hm, thinking about this further, this would need dithering to work properly (which probably works fine, but the perceived quality difference would mean pixel density comparisons aren't apples-to-apples) Presumably, you get to control hue and brightness per-pixel. But that only gives you access to a thin slice of the sRGB gamut (i.e. the parts of HSL where saturation is maxed out), but dithering can solve that. Coming…
Note that even if we restrict our attention to the max-saturation curve, these pixels can't produce shades of purple/magneta (unless, as you say, they use temporal dithering or some other trick).
