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joeycastillo / The-Open-Book

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Slightly larger, high resolution display? #28

Closed Drizzt321 closed 1 year ago

Drizzt321 commented 4 years ago

So love, LOOOOOVE this. Will definitely be making one of these, although my trust PRS-T3 is managing to stay alive. Personally I prefer the size of a 6" display, rather than 4.2". I found https://zh-tw.buyepaper.com/6-inch-1024758high-resolution-epd-display-p0096.html except it's 34-pin parallen, so not a drop-in compatible. Is there any info that, in your research, you've found that could be useful to someone wanting to tweak the design to support these slightly larger displays?

I did just find https://www.waveshare.com/wiki/6inch_HD_e-Paper_HAT which uses IT8591 parallel controller for e-ink displays. Wish they would open-source the design and software. I definitely can see it as more of a v2/advanced.

I suppose I could just go straight to https://zh-tw.buyepaper.com/583-inch-high-resolution-648x480-e-paper-display-black-and-white-e-ink-screen-gdew0583t8-p0363.html which is a 5.48" that still uses the same 24-pin SPI FPC, so probably a drop-in other than mounting differences and changing the resolution/size in the code.

joeycastillo commented 4 years ago

A screen with a parallel interface is something on my radar screen, though the two panels I'm more interested in are either Good Display's 4.3 inch high resolution panel or, more exciting to me, using a recycled Kindle screen like the Inkplate 6 does. The Inkplate folks' Github repository has some code related to driving that screen that I want to play with, once I get software support for this iteration of the Open Book further along.

Also, note that those panels, to my understanding, do not have an on-board booster, which means you would likely also need to add a PMIC like the TPS65185 or TPS65186 to generate the higher voltage rails necessary to drive the screen.

As for the 5.83 inch screen, I've tested it with the Open Book (using the GxEPD2 library), and it "just works"; the same booster circuit and flex connector gets images displaying on the screen. As you say it would involve some dimension tweaks and a larger cutout, but relatively trivial. Having said that, a couple of reasons I don't think it's a great match:

I think it's rad to be looking at larger and higher-res screens, but be careful to watch out for both price and features in addition to panel size and resolution :)

Drizzt321 commented 4 years ago

No, didn't notice the slower refresh and no partial-refresh. Yea, those are big features for e-books. That plus the cost makes that 4.2" far superior.

Hadn't seen that Inkplate 6, very cool. Nice to see that you should be able to re-use some of the same software. A popular quality screen like for a Kindle definitely is useful to have support for. I've got some other projects, but hoping I might be able to join in this winter after I clear some of them off. And get more Arduino dev experience.

seniorm0ment commented 3 years ago

Any updates on this? I'm interested in building an Open Book, that being said the small display is a complete deal breaker for me currently. Of course a larger screen would imply a higher cost, that being said having the option is nice. I think it's important to try to compete with retail readers such as Kobo and Kindle.

An 8" 1440 × 1920 300 PPI display like the one found in the Kobo Forma is ideally what I'm looking for. If not that, then at least a 6" 1072 x 1448 300 PPI display similar to the one found in the Kobo Clara HD.