5 ms·
So what? Someone made progress in an area I find interesting. That's much more useful to me than yet another comment that is crapping on someone else's work.
by SantalBlush 4y ago
So what? Someone made progress in an area I find interesting. That's much more useful to me than yet another comment that is crapping on someone else's work.
- db48x 4y agoBut it isn’t progress. The refresh rate of the screen is still 130ms but now it’s being updated 8 times faster than that, before the pixels have changed color. Thus they continue changing color for the next eight frames before finally reaching either black or white. If your LCD panel did that you would toss it in the trash; most people cannot tolerate more than two or three frames of latency before complaining about motion blur and ghosting.
- eternityforest 4y agoSo they are basically feeding high frequency data into the e ink which low pass filters it? That's still progress, some of the high frequency information gets through, it's just blurred.
- db48x 4y agoNo, that isn’t what is going on. There’s no filter. It just updates the display at 60 Hz. If you simply pause the video you will see the result: the last eight frames are all visible at the same time, getting fainter as they get older. It makes every moving object look like it has a trail of ghosts following behind it. All LCD monitors have this problem to some extent, but cheap LCD monitors are the worst. This display is about 4× worse still. Update: Here, a screenshot: http://db48x.net/temp/Screenshot%20from%202022-06-09%2000-59-45.png http://db48x.net/temp/Screenshot%20from%202022-06-09%2000-59... This is taken right during the arm movement as she throws the apple up at the beginning of the video. Since she is drawn in black on a white background, the image of her arm from the current frame (at the top) is super faint. The pixels in the apple will never reach full black because they were supposed to be black for a frame and then go back to white next frame. They started darkening, but they are already being told to lighten again. The apple essentially disappears during this motion, and it’s supposed to be the focal element of the scene!
- lagrange77 4y agoThe inertia of the e ink itself is the low pass filter, i think.
- db48x 4y agoThat’s just not a useful analogy.
- lagrange77 4y agoIt wasn't meant as an analogy. Am i wrong in that the mass of the ink particles is the root cause for the low refresh rate of i ink displays?
- db48x 4y agoI have no idea why these displays are so slow, but the concept of a “low–pass filter” just doesn’t apply here.
- lagrange77 4y agoOkay, now an analogy: Imagine a container vessel and a rowboat. Which of them is more stable, when you alternate their steering angle with a high frequency?
- nomel 4y agoAt this point I would say your incorrect. The e-ink is acting as a temporal low pass filter, for the desired signal that is the brightness of that pixel. Perhaps you’re thinking of a spatial low pass filter?
- TT-392 4y agoI thought it was useful
- _dh54 4y agoIt's not an analogy. It's literally what is happening. This is apparent by your own admission that each pixel displayed is an average of the last eight frames of that pixel. That is the definition of a convolution filter. The display acts as a physical convolution filter, which is implementing a low-pass filter.