I have a small array of sensor data (collected by an UNO) I would like to display on a larger screen, like 7.5 inch, that can be seen a meter or two away. I would like to use an e-Paper display directly connected to a Mega or Uno (With clean fonts of a chosen size) if possible. Or is this a Raspberry Pi fed by a Uno feat, or?
It looks like some polished display graphics quality is coming from an ESP32 board by Waveshare I believe.
Sure, easy. I have some epaper displays that I've tested with a Nano. Make sure they are 5V compatible though...
That's great.
How would the refresh rate be?
One video here using a 7.5" made an issue over screen-burn-in, is this a real problem?
The product price signs in retail stores like Kohls, must not have a screen burn issue, as they are used for multiple products over their life, and don't have images burned from previous products.
Maybe the screen could be blacked-out when no data is present to display.
(so Kindle paper white tablets can be on for hours at a time and not have burn-in?)
I would need this display to be on continuously, if it has to be blacked-out and have time-outs frequently, this may not be what I need.
No such thing as "burn-in" because the tech is all "charged-based"; but sometimes, the refresh on my Waveshare units will leave a "ghosting" because the black/white spheres do not fully migrate front-to-rear quickly. Eventually, the issue seems to clear up. (may be room temperature related in that basement lab is about 10 F degrees cooler.
aarg,
Are you using a 7.5" 3V/5V or 5V only version?
Where did you find it?
I'm seeing small 3v/5v displays but not the larger ones.
Brutally, horribly slow, and the screen flashes while it is happening. IIRC, about 5-10 seconds per update.
No, I'm using much smaller displays. My budget isn't big enough to invest in something like that unless I actually need it. I have two, close to 1.9" diagonal units. One is 5V compatible, the other one is only 3.3V capable.
I worried a little about burn in, because it came to me with a crappy factory pattern, I thought, I'd better hurry up and find something to clear it. But it turns out, it can safely maintain the same image for months or years.
I strongly recommend testing a smaller one to get some hands on feel for how it operates, if you are considering any dynamic information display.
There is a partial refresh feature on some of them, that minimizes the flashing. You need to witness that one too.
Is the horribly slow refresh noticed mostly with complex graphic images, or does simple text have the same refresh behavior?
I'm wondering if the slow refresh is because of the slow Arduino driver, data rate, or?
Anything, any write. It's inherent in the display technology. Also there are finite write cycles. I considered a clock, but the seconds count would kill it before (I can't recall the exact interval) any useful time span.
Just get one and play with it.
For E-paper displays that support partial refresh, please note that you cannot refresh them with the partial refresh mode all the time. After refreshing partially several times, you need to fully refresh EPD once. Otherwise, the display effect will be abnormal, which cannot be repaired!
It is a normal phenomenon that the three-color EPD will have a certain color difference in different batches. Hence, It is recommended to use the program to clear all the pictures on the EPD and store it facing up. Please clear the screen several times before powering on.
Note that the screen cannot be powered on for a long time. When the screen is not refreshed, please set the screen to sleep mode or power off it. Otherwise, the screen will remain in a high voltage state for a long time, which will damage the e-Paper and cannot be repaired!
When using the e-Paper display, it is recommended that the refresh interval be at least 180s, and refresh at least once every 24 hours. If the e-Paper is not used for a long time, you should use the program to clear the screen before storing it. (Refer to the datasheet for specific storage environment requirements.)
After the screen enters sleep mode, the sent image data will be ignored, and it can be refreshed normally only after initializing again.
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