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4.2 inch ePaper Bare Display
You may be familiar with ePaper or eInk displays from eReaders like the Kindle. This display is the next step up with three colors instead of the classic two. The displays really do seem like paper, with easy visibility from almost any angle and even in sunlight. It also features ultra low power consumption. You can even unplug the display entirely without losing your image! This display does take 14 seconds to refresh, but it is ideal for applications where information is updated infrequently, like a weather station or a high tech label.
This 4.2" ePaper display uses black, white, and red pigments on a 400 by 300 pixel matrix.
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Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum for support or to ask a question.
4.2 inch ePaper Bare Display Product Help and Resources
Everything You Should Know About HyperDisplay
February 20, 2019
This is a tutorial to go in-depth about the SparkFun HyperDisplay Arduino Library.
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What is the correct ePaper controller to use with this? The small 1.54" display includes a SPI-based controller with it.
It has a built-in controller, check out the datasheet. That lists all the SPI commands to control the display. Note that some of the pins require extra consideration, see section 7-5 "Reference Circuit" of the datasheet.
Is 14 seconds the correct update lag? Not 1.4 seconds?
Yes, 14 seconds is the correct update lag. I don't have this specific panel, but I do have a similar, red/white/black panel on a pHAT from Pimoroni. The three color ones are very very slow. Two color displays are much faster -- those are the ones with the 1 second or so refresh time.