5 ms·
how do they do the black?
by jpeg_hero 6y ago
how do they do the black?
- mortenjorck 6y agoMy first thought was "well of course they don't," but their concept renders do indeed have opaque black. I'm guessing these are just technically uninformed renders with no basis in actually-proposed applications, but it seems at least plausible that one could combine transparent OLED with a transparent LCD backing (sort of the inversion of a backlight) to create a variable-transparency screen.
- ACAVJW4H 6y agoPardon my ignorance but wouldn't LCD need polarized light to perform the darkening? Maybe a transparent pixelated electrochromic display layer might work
- numpad0 6y agoLCD usually has polarization filters already glued to the back
- heftig 6y agoThe backlight of an LCD isn't itself polarized. A TN LCD display is made of two orthogonal polarization filters with the liquid crystals in between. In their relaxed (twisted) state, the crystals rotate the polarization of the light so that it can pass the second filter. When a voltage is applied, the crystals straighten and the second filter blocks the light.
- _jal 6y agoDark-suckers. http://web.mit.edu/kolya/misc/txt/dark_suckers http://web.mit.edu/kolya/misc/txt/dark_suckers
- crazygringo 6y agoA basic transparent OLED screen doesn't, but is often slightly tinted, and (indoors) its pixels are bright enough that the transparent pixels are dark enough to appear black by comparison. The same way you can run a projector on a white wall during the day, and its "black" is just the normal wall color. But while I've never seen it, I don't see why you couldn't put a transparent OLED over an LCD screen like the one in your laptop. Combined, I think they'd give you every combination of color and opacity you could want. I don't know if there's any technology that combines the two capabilities into a single layer.
- StavrosK 6y agoWhat does putting it over an LCD achieve?
- kube-system 6y agoLCDs filter light, so using one, you'd be able to get black?
- StavrosK 6y agoCouldn't you just put a piece of black plastic behind the transparent OLED to do the same?
- kube-system 6y agoYes, but you've now created a non-transparent OLED display, which already exists.
- StavrosK 6y agoOh, you mean a transparent LCD display, I see now.
- kube-system 6y agoTechnically LCDs are all transparent, if we're not counting the backlight. https://youtu.be/cEhZ7fUSxDw?t=33 https://youtu.be/cEhZ7fUSxDw?t=33
- StavrosK 6y agoYeah, I was thining a full-color, backlit LCD system, basically a computer monitor.
- loughnane 6y agoBlack LEDs :)