12 ms·
Uhhh....how does the screen show black?
by cubano 2y ago
Uhhh....how does the screen show black?
- shermantanktop 2y agoEach of the pixels is actually a little shining eye which watches your every move. When the pixel’s eyelid closes, that pixel turns black. That’s why they call it putting a display “to sleep.”
- Waterluvian 2y agoI like your explanation, but to be fair, it depends. Some displays are implemented with dual-eyelid technology for the blackest of blacks. Naturally, like all genius engineering, we see this in nature: cats.
- ahoka 2y agoThe screen knows what color it displays at all times. It knows this because it knows what it doesn't. By subtracting what it does from what it doesn’t, or what it doesn’t from what it does (whichever is greater), it obtains a difference, or deviation. The controller board uses deviations to generate corrective commands to drive the display from a state where it does not display black to a state where it does, and arriving at a state where it displays black, it now doesn't display anything.
- nilamo 2y ago[flagged]
- appendix-rock 2y agoI’ve just broken out in a rash. Thanks.
- speff 2y agoFor the uninitiated: The Missile Knows Where It Is[1] [1]: https://youtu.be/bZe5J8SVCYQ https://youtu.be/bZe5J8SVCYQ
- yetihehe 2y agoThere is also version for those already initiated [1]. [1] https://www.youtube.com/watch?v=_LjN3UclYzU https://www.youtube.com/watch?v=_LjN3UclYzU
- foota 2y agoIt depends afaict. OLED screens have a per-pixel light, and they turn off pixels to make black. LCDs have a single large backlight and pixels that the light shines through and they can change color (but not turn off) so in that case they turn as opaque as possible, but don't completely block the light.
- thayne 2y agoAnd in a CRT the electron beam turns off when scanning over a pixel.
- Ekaros 2y agoThere is also things like microled. Which means that there is bunch of small(bigger than multiple pixels) lights that turn on and off as needed.
- account42 2y agoBlack pixels in an OLED still reflect some light so their are not completely black either.
- GuB-42 2y agoHe said it, it is ultimately a turn off.
- oneshtein 2y agoIn case of a LCD, black pixel is turned ON to block backlight. It's clearly visible on monochrome LCD screens. In case of e-paper, black pigment is attracted to the outer part of the screen.
- Groxx 2y agoWhat, you've never heard of a "black light" before? They just turn on the black sub-pixels. https://en.wikipedia.org/wiki/Blacklight https://en.wikipedia.org/wiki/Blacklight