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The question is why I would put up with all this effort and limitations with eink. The latency is not high, but you need to be smart on what you display (the original vi editor would actually be a _perfect_ fit for this )) In a sense, it's like working remotely with a slow modem. one year ago on their screens? - another vaporware demo) (Ironically eink demonstrated high refresh rate video playback what.
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It can be done, but would eventually require a full screen refresh to get good quality due to ghosting again. What is harder is modifying blocks of text. There are many ways to control ghosting in a way that doesn't affect the latency too much (essentially, refresh asynchronously - and again - only where needed)įor regular typing, I have no doubts it can work without disruption. With partial updates the latency can be pretty low.
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I suspect you could get better results by using larger and better tuned tables, and I've seen a hobbyist actually get higher color depth by using their own waveforms.Īn eink display doesn't handle the same as a regular framebuffer, and the speed of the update depends a lot of what operation you want to do on it and how you want it to look like. It looks like they are just "good enough" and small enough to fit into the cheap MCU. These "waveforms" or "wavetables" are proprietary and secret. It depends on the previous color of the pixel and the temperature. There is a look-up-table in the microcontroller that tells the display how much current to use to switch a pixel to a given color. But apparantly not good enough for e-ink. We had good use cases: industrial PCs, outdoors informational displays, and so on. I would suspect a cartel, but it doesn't make any sense - e-ink is too slow and to ugly to really cannibalize laptop and monitor sales. And that the traditional display companies could retool pretty quickly to make e-ink instead, but won't. Įven further, a Chinese colleague hinted that they will never sell to you if you are doing anything in the consumer space (except you are one of the big e-reader makers of course). And I had a strong suspicion that it was artificially limited to a lower color depth than possible. The sample we got had labels scratched from the chips (OK this is actually more common than you might think).
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The reseller would only sell them to us after giving them a detailed business plan. I previously worked in the display and industrial PC industry, and we tried to buy e-ink panels. I can confirm (take it with a grain of salt, I can't give you written sources but it matches the experience of many people).