hardware Uncategorized

Attempts source large E-Ink screens for a laptop-like device

One idea that’s been bouncing around in my head for the last few years has been a laptop with an E-Ink display. I would have thought this would be a niche that had been carved out already, but it doesn’t seem that any companies are interested in exploring it.

I use my laptop in some non-traditional environments, such as outdoors in direct sunlight. Almost all laptops are abysmal in a scenario like this. E-Ink screens are a natural response to this requirement. Unlike traditional TFT-LCD screens, E-Ink panels are meant to be viewed with an abundance of natural light. As a human, I too enjoy natural light.

Besides my fantasies of hacking on the beach, these would be very useful to combat the raster burn that seems to be so common among regular computer users. Since TFT-LCDs act as an artificial sunlight, they can have very negative side-effects on the eyes, and indirectly on the brain. Since E-Ink screens work without a backlight they are not susceptible to these problems. This has the potential to help me reclaim some of the time that I spend without a device before bedtime for health reasons.

The limitations of E-Ink panels are well known to anybody who has used one. The refresh rate is not nearly as good, the color saturation varies between abysmal to non-existent, and the available size are much more limited than LCD panels (smaller). Despite all these reasons, the panels do have advantages. They do not give the user raster burn like other backlit panels. They are cheap, standardized, and easy to replace. They are also useable in direct sunlight. Until recently they offered competitive DPI compared to laptop panels as well.

As a computer professional many of these downsides of LCD panels concern me. I spend a large amount of my work day staring at the displays. I fear this will have a lasting effect on me and many others who do the same.

The E-Ink manufacturer offerings are surprisingly sparse, with no devices that I can find targeted towards consumers or hobbyists. Traditional LCDs are available over a USB interface, able to be used as external displays on any embedded or workstation system. Interfaces for E-Ink displays are decidedly less advanced. The panels that Amazon sources use an undocumented DTO protocol/connector. The panels that everybody else seems to use also have a specific protocol/connector, but some controllers are available.

The one panel I’ve been able to source to try to integrate into a laptop-like object is PervasiveDisplay’s 9.7″ panel with SPI controller. This would allow a computer to speak SPI to the controller board, which would then translate the calls into operations to manage drawing to the panel. Although this is useful, availability is limited to a few component wholesale sites and Digikey. Likewise it’s not exactly cheap. Although the SPI controller board is only $28, the set of controller and 9.7″ panel is $310. Similar replacement Kindle DX panels cost around $85 elsewhere on the internet.

It would be cheaper to buy an entire Kindle DX, scrap the computer and salvage the panel than to buy the PervasiveDisplays evaluation kit on Digikey. To be fair this is comparing a used consumer device to a niche evaluation kit, so of course the former device is going to be cheaper.

To their credit, they’re also trying to be active in the Open Hardware community. They’ve launched, which is a site advocating freeing ePaper technology from the hands of the few companies and into the hands of open hardware enthusiasts and low-run product manufacturers.

From their site:

We recognize ePaper is a new technology and we’re asking your help in making it better known. Up till now, all industry players have kept the core technologies closed. We want to change this. If the history of the Internet has proven anything, it is that open technologies lead to unbounded innovation and unprecedented value added to the entire economy.

There are some panels listed up on SparkFun and Adafruit, although those are limited to 1.44 inch to 2.0 inch displays, which are useless for my use case. Likewise, these are geared towards Arduino compatibility, while I need something that is performant through a (relatively) fast and high bandwidth interface like exists on my laptop mainboard.

Bunnie/Xobs of the Kosagi Novena open laptop project clued me in to the fact that the iMX6 SoC present in the aforementioned device contains an EPD (Electronic Paper Display) controller. Although the pins on the chip likely aren’t broken out to the board, it gives me hope. My hope is that in the future devices such as the Raspberry Pi, CubieBoard, or other single-board computers will break out the controller to a header on the main board.

I think that making this literal stockpile of panels available to open hardware enthusiasts, we can empower them to create anything from innovations in the eBook reader market to creating an entirely new class of device.

12 replies on “Attempts source large E-Ink screens for a laptop-like device”

This looks awesome. I obviously didn’t pay attention to some of the smaller displays at CES! Thanks for the reply, I’m excited that some folks are pushing this technology forward.

A few years ago it seemed Pixel Qi was just about to blow the marked wide open (see e.g. stories on slashdot), but not much have been heard from them lately (perhaps because Mary Lou Jepsen moved to Google X). But looking at their site (although it seems to have technical problems currently), it seems that they do have products. I seem to remember that they also sold kits, so you could replace the screen on your existing laptop.

I do remember this too. There was one model of display that could be retrofit to a single Lenovo netbook, although generic kits were never sold. Some folks were interested in picking up old stock to try to retrofit, although apparently these are notoriously hard to source these days.

The transflective screens could be even better, although these never took off. Sad.

I am thinking of getting a large e-reader with bluetooth and wifi. This one seems to fit the bill:
With an external BT keyboard and a good stand, it might function as a workstation. Android is quite a powerful OS already, and you can already open a terminal and execute command line apps, surf the web with firefox or chrome and do wordprocessing or spreadsheet work.

I know I would buy this sort of device in a heartbeat. Being in a Northern Climate, I want to spend as much time in the summer outside as possible, and with working from home (and free from having to stay stationary, inside all day), it would be nice if my computer could be as portable/flexible as possible.

This seems like it wouldn’t be that hard to put together. If it can be done DIY, you would think that a small-batch operation could be created. When I heard about the Lenovo mod a couple of years ago, that seemed like a no brainer.

There have to be lots of people who want to work outside, right?

It’s been nearly a decade that I’ve been pining for such a thing. I suppose that, while there would be many adopters, it wouldn’t suffice for a sustainable product. More availability of components for tinkerers would be the next best thing. Given the availability of cloud resources, such a device would be nifty for a variety of reading and dev purposes. Here’s to hoping…

Great post – I’ve wanted to have an e-ink laptop for several years, and had contacted US and Russian companies in the space, who told me it wasn’t a good idea. As someone spending many hours daily in front of screens, reading & writing papers, source code and notes I’d be willing to accept certain shortcomings of a first version of such a device and a considerable price premium. I wonder how many of us are out there?

I was wondering if anybody has ever tried to connect a 6″ e-ink screen Replacement for Amazon Kindle to a raspberry pi…
those come around $40 on ebay…

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