3 ms·

What's unclear here is the refresh rate, but knowing the Kindle(s) this is hardly faster than 0.5fps

Rebelgecko 2y ago
It looks like it has the ability to do partial refresh
adtac 2y ago
updated the gist: I'm getting close to 3-4 frames per second! this is only possible because of the partial screen refreshes since most pixels don't change between consecutive frames
- denysvitali 2y ago
  Oh wow. That's nice! Yes, if it does partial refreshes then the refresh rate might be way faster than I expected. Awesome!
Mountain_Skies 2y ago
For me, that would be fine. It's common to have some reference or other piece of information that I want handy but doesn't change much.
retrac 2y ago
Here's my old Kindle Touch 2 running a hacky Android 4 port attempt and a Game Boy emulator: https://i.imgur.com/m7ZZ1Xm.mp4 https://i.imgur.com/m7ZZ1Xm.mp4 I'd say more like 2 - 3 fps. Not sure why there are random black lines. Display driver doesn't handle the demand of constant update very well. I normally use it as an e-ink picture frame.
dredmorbius 2y ago
Independent of the methods indicated here (screen capture + imagemagick conversion), there's the underlying question of E-innk hardware capabilities. I can speak to the latter. E-Ink screens are usually capable of a number of different refresh / display modes, which trade higher-quality visual appearance (crispness, greyscale, ghosting) for slower refresh. Refresh rates typically range from ~2-4 Hz at highest quality to 16--60 Hz at lower quality, but faster-updating modes. For most E-ink devices I've seen there are typically four modes, "Normal/Regal" (highest quality), "Speed", "A2", and "X-Mode" (fastest refresh). "Normal" is best for reading static text. "Speed" is sufficient for terminal-based sessions (I have Termux installed on my Onyx BOOX tablet), and most interactive apps (e.g., Web browsers, Podcast apps). I find little practical distinction between "Speed" and "A2". X-Mode does show considerale ghosting, but is indeed capable of video playback. Typically it's also possible to set the full-refresh interval (now many repaints are premitted between full refreshes which clear ghosting but give a distinct "flash" update. E-ink has a number of compromises, but is quite usable. Apps which are designed with its capabilities and limitations in mind are much better suited. Mostly that involves full-screen pagination of content rather than scrolling. Given the ubiquitous use of touch-based scrolling in most Mobile applications, this can be somewhat frustrating. I tend to use dedicated e-ink apps (such as Onyx's own NeoReader book reader), apps tuned for E-ink such as Einkbro, a Web browser, or terminal-based apps which work well in a text-based context.

It looks like it has the ability to do partial refresh

updated the gist: I'm getting close to 3-4 frames per second! this is only possible because of the partial screen refreshes since most pixels don't change between consecutive frames

denysvitali 2y ago
Oh wow. That's nice! Yes, if it does partial refreshes then the refresh rate might be way faster than I expected. Awesome!

Mountain_Skies 2y ago

For me, that would be fine. It's common to have some reference or other piece of information that I want handy but doesn't change much.

retrac 2y ago

Here's my old Kindle Touch 2 running a hacky Android 4 port attempt and a Game Boy emulator: https://i.imgur.com/m7ZZ1Xm.mp4 https://i.imgur.com/m7ZZ1Xm.mp4 I'd say more like 2 - 3 fps. Not sure why there are random black lines. Display driver doesn't handle the demand of constant update very well. I normally use it as an e-ink picture frame.

dredmorbius 2y ago

Independent of the methods indicated here (screen capture + imagemagick conversion), there's the underlying question of E-innk hardware capabilities. I can speak to the latter. E-Ink screens are usually capable of a number of different refresh / display modes, which trade higher-quality visual appearance (crispness, greyscale, ghosting) for slower refresh. Refresh rates typically range from ~2-4 Hz at highest quality to 16--60 Hz at lower quality, but faster-updating modes. For most E-ink devices I've seen there are typically four modes, "Normal/Regal" (highest quality), "Speed", "A2", and "X-Mode" (fastest refresh). "Normal" is best for reading static text. "Speed" is sufficient for terminal-based sessions (I have Termux installed on my Onyx BOOX tablet), and most interactive apps (e.g., Web browsers, Podcast apps). I find little practical distinction between "Speed" and "A2". X-Mode does show considerale ghosting, but is indeed capable of video playback. Typically it's also possible to set the full-refresh interval (now many repaints are premitted between full refreshes which clear ghosting but give a distinct "flash" update. E-ink has a number of compromises, but is quite usable. Apps which are designed with its capabilities and limitations in mind are much better suited. Mostly that involves full-screen pagination of content rather than scrolling. Given the ubiquitous use of touch-based scrolling in most Mobile applications, this can be somewhat frustrating. I tend to use dedicated e-ink apps (such as Onyx's own NeoReader book reader), apps tuned for E-ink such as Einkbro, a Web browser, or terminal-based apps which work well in a text-based context.