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Old 05-21-2024, 11:24 AM   #1
Greg001
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Boox Note Air 3C Weird Screen Flickering Every Few Seconds

Sorry if this questions has already been asked.

My Boox screen has this weird static image flickering every 2 to 3 seconds which is slightly annoying particularly since I don't know why it does so. It doesn't seem to be any automatic refresh since I have the automatic refresh set to zero.

The whole image, particularly in graphic novels using CDisplayEx, just flickers every couple seconds. Why does it do that since it does that with non-scrolling, static images? is there a way to stop the flickering?

Thanks,

G.
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Old 05-21-2024, 05:56 PM   #2
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Quote:
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My Boox screen has this weird static image flickering every 2 to 3 seconds...
You need to get ADB running so that you can:
Code:
C:\>adb logcat
In idle this should be fairly passive.
If something is looping, you'll see it.
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Old 05-22-2024, 02:28 AM   #3
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Quote:
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You need to get ADB running so that you can:
Code:
C:\>adb logcat
In idle this should be fairly passive.
If something is looping, you'll see it.
Not necessarily - it could also be a malfunction of BSR; it works independently
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Old 05-22-2024, 06:38 AM   #4
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Not necessarily - it could also be a malfunction of BSR; it works independently
Right. I just meant that if you see something in logcat it's something looping.

It's hard to figure out which Onyx devices have BSR.
The NoteAir3C is the first non-Tab to have BSR, or?
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Old 05-22-2024, 02:51 PM   #5
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Hi. I'm dealing with exactly the same issue. Screen on my device flickers every couple of seconds.I tried various auto-refresh settingsin the screensaver app but with no success so far. I really like the device but this screen flickering is really annoying.
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Old 05-22-2024, 04:46 PM   #6
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So, look at the adb logcat.

Are there any Onyx that do video out over USB Type C? Check that.

You could also look at real time power consumption if you intercept the battery with a monitor.

You could also look for traffic over the Eink data path.

Is this exactly regular or more random?
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Old 05-23-2024, 06:52 AM   #7
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Quote:
Originally Posted by Renate View Post
Right. I just meant that if you see something in logcat it's something looping.

It's hard to figure out which Onyx devices have BSR.
The NoteAir3C is the first non-Tab to have BSR, or?
BSR have all "Tab" devices NA3C and Palma - Palma was the first

Last edited by ottischwenk; 05-23-2024 at 06:54 AM.
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Old 05-23-2024, 06:54 AM   #8
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Originally Posted by Renate View Post
So, look at the adb logcat.

Are there any Onyx that do video out over USB Type C? Check that.

You could also look at real time power consumption if you intercept the battery with a monitor.

You could also look for traffic over the Eink data path.

Is this exactly regular or more random?
Hi Renate,

It's absolutely regular, but then sometimes doesn't happen. Perhaps it's between reboots? It has shown so far in 2 apps, CDisplayEx and NeoBrowser. It's as if the display "pulsates." It's really bizarre.
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Old 05-23-2024, 08:23 AM   #9
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There are three separate sources that could come into play.
  • The Eink display
  • The LCD display
  • The LED light
Can you determine what makes this appear worst?
Does color content vs B&W make a difference?
Does changing the LED lighting make a difference?
Can a video recording catch a "dip" or "flash"?
Can a screen capture catch any interim effect?
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Old 05-26-2024, 10:04 AM   #10
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Quote:
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{...}

Are there any Onyx that do video out over USB Type C? Check that.

{...}
scrcpy seems to work pretty well for these devices. Except for some models that don't have an audio codec that the program wants to use... but you can disable that with a commandline switch.

Interestingly it will show screen updates that the device's screen driver doesn't take notice of. (In other words, the eInk display doesn't always update with what is really present and scrcpy shows)
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Old 05-26-2024, 12:17 PM   #11
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No, scrcpy probably won't give me the insight I'm looking for.
My adbgrab.exe can do that too, but it's much slower because it doesn't use any other software on the Android.

My understanding of "BSR" (which could be totally wrong since there is so little info).
The Android puts out standard video (as for an LCD) over a DSI interface.
The custom Onyx chip (with the help of its own video buffers) turns that into Eink updates.
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