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Jailbroke my Kindle to use it as an e-ink monitor

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Re: Jailbroke my Kindle to use it as an e-ink monitor

#72

Earlier quoted context omitted.

The good news, maybe, is that "E-Paper" (transflective LCD displays), capable of much higher refresh rates (60 -- 180 Hz), though with greater power draw and lacking E-Ink (electrophoretic) display's persistence, but otherwise sharing bright-light / daylit visibility, are starting to appear. What I've seen of E-Paper displays isn't especially encouraging on the cost front, as similarly-sized displays seem to have rou…

Transflectve LCDs can't compete against Eink on contrast. They are inherently compromised on light transmission because of the polarizers and the modern desire for [back|front]light support.

I'm aware of LCD's inherent contrast handicap due to polarising filters. That said, E-ink also has a relatively low contrast ratio. Interestingly, that turns into a benefit under direct sunlight, where ink-on-paper is often too bright.

Finding current specs is challenging, but E-Ink Carta, as of 2013 (over a decade ago) was citing a 15:1 contrast ratio:

https://wiki.mobileread.com/wiki/E_Ink_Carta>

Edit/Update: A more recent HN comment gives 12:1 as applying to most E-Ink displays as of 2020, with 8:1 being more common: https://news.ycombinator.com/item?id=22832452>

I suspect current displays are somewhat better, and I'm seeing a "50% improvement" comment bandied about but without a corresponding contrast ratio. Earlier displays had an 8:1 ratio.

In practice, displays will have worse contrast with additional layers on top of the display, such as a Wacom tablet, capacitive touch, frontlight, and any surface "tooth" treatment.

E-Paper cites a 30:1 ratio, which would be far greater contrast:

https://www.newvisiondisplay.com/transflective-lcds/>

I've had direct personal experience with E-Ink, but not with transflective LCD tablet displays.

I suspect that in practice the displays are reasonably comparable in terms of contrast.

Re: Jailbroke my Kindle to use it as an e-ink monitor

#74
post #49

Earlier quoted context omitted.

That video has always felt unprofessional to me. I wish we'd choose something else.

It's one of those things where if someone does the work, they're allowed to show off how they like. Next time you do an interesting display mod or port, you can choose whatever video you like.

I meant it's a bit like the Lena image in digital image processing.

I get that the original author of the series is above board, but the fandom around touhou is full of enough toxic people that it's often the first thing one encounters or associates with the brand. Kind of like the tug of war with Pepe, but much worse.

I just now did a Google image search for "touhou" (just that term, no quotes) with safe search enabled and you might guess what came back. And these characters are supposed to be children.

I don't want to be a nanny or intrude on people who most likely mean no harm, but if video demos are to have a "standard" test video, should it really be Bad Apple? If you've got something really cool to show off, don't spoil it by associating it with that.

Re: Jailbroke my Kindle to use it as an e-ink monitor

#76

Someone get Apple Books on a Kindle and I'll pay you a million dollars.

Why trade one walled garden for another? Just use something like Calibre and combine it with something like Kavita.

What does combining them get you?

I use Calibre but hadn't heard of Kavita and I'm not clear what Kavita gives me that I don't already have with Calibre?

Re: Jailbroke my Kindle to use it as an e-ink monitor

#78
post #53

Anyone have a write-up for doing this with a Remarkable 2?

Fairly sure you can run a vnc client on a remarkable 2. I've been on the fence about getting one for a few years and I'm not super up to date on them, but a quick search turned this up https://github.com/matteodelabre/vnsee

I rely in mine so much that I'm not game enough to try that lol

Re: Jailbroke my Kindle to use it as an e-ink monitor

#79

Earlier quoted context omitted.

Why trade one walled garden for another? Just use something like Calibre and combine it with something like Kavita.

What does combining them get you? I use Calibre but hadn't heard of Kavita and I'm not clear what Kavita gives me that I don't already have with Calibre?

I hadn't heard of Kavita either, but it looks like it's a lot prettier than Calibre, and (perhaps) has better a better reader. It looks like it doesn't manage format conversion and syncing though, which I guess is why you'd use both it and Calibre together.

Re: Jailbroke my Kindle to use it as an e-ink monitor

#80

Earlier quoted context omitted.

I’ve been using Daylight Computer’s new Android tablet for a while now, which has a 60fps reflective grayscale LCD screen. During the day it looks and behaves like E-paper, but with a much faster display rate. It’s also got a warm backlight for use at night. When the backlight is off the contrast is lower than the E-ink Carta panel used in the Remarkable and Boox tablets, but the backlight and fast refresh really hel…

How's battery life? Have you compared sessions where you're principally, say, reading books with a bookreader app vs. Web browsing, or using other apps? My experience on the BOOX, an E-ink device, is that web browsing (Einkbro) consumes battery at ~10x the hourly rate that reading books (Neoreader) does. How much of that is active display, and how much is other CPU usage, I don't know.

My experience on the reMarkable 2 is that leaving it "off", showing the screen it displays when it detects that you haven't done anything for a while, will drain the battery in a matter of days, whereas leaving it "off", showing the screen it displays when you manually navigate into the shutdown menu and tell it to turn off, drains the battery in a matter of months.

I assume that none of the difference is in active display; the display is static in either case.

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