4 ms·

It's way simpler than that, you just write the displayed image more times based on temperature. If you don't do it your display will just have less contrast in

It's way simpler than that, you just write the displayed image more times based on temperature. If you don't do it your display will just have less contrast in the code. The chip-on-glass has tons of registers to set drive voltages and the like, but the datasheet just gives you values to write to all of them. What do you mean by e-ink driver? If you mean the software, check out the Arduino and Raspberry Pi librares on the repaper site. If you mean the hardware, just follow the schematics in the datasheet and repaper.org.

i336_ 10y ago
> It's way simpler than that, you just write the displayed image more times based on temperature. Oh! Nice. > If you don't do it your display will just have less contrast in the code. That's a really great failure mode for debugging/development :) you can just use a single repaint count until you have temperature sensing wired up. > The chip-on-glass has tons of registers to set drive voltages and the like, but the datasheet just gives you values to write to all of them. Oh okay - so there _is_ a controller. (I didn't know; totally ignorant about the subject.) > What do you mean by e-ink driver? Ah; I've just done some poking around, and I just realized I misunderstood things a bit when I last did some research (way too quickly, apparently) - I saw http://www.pervasivedisplays.com/images/Kits/Extension%20board/Eink%20epaper%20Extension%20kit%20by%20Pervasive.jpg http://www.pervasivedisplays.com/images/Kits/Extension%20boa... and thought I'd need to cram everything on that board onto the final design. I didn't realize the displays were more or less self-contained (with a builtin/COG controller) and could be driven directly like LCDs or VFDs etc and that that board was the "kitchen sink" test/dev breakout kit.
- TD-Linux 10y ago
  You do need part of that - a lot of it is capacitors wired directly to the ribbon cable, for the COG's charge pump. There's also a temperature sensing chip and a couple of external mosfets, one of which is to fix a bug on older COGs. On my own layout I was able to shrink it quite a bit by using 0603 parts. Still expect to burn 300mm^2 on the passives. https://0x0.st/tqo.png https://0x0.st/tqo.png
  - i336_ 10y ago
    Ah, I see. Thanks.

i336_ 10y ago

> It's way simpler than that, you just write the displayed image more times based on temperature. Oh! Nice. > If you don't do it your display will just have less contrast in the code. That's a really great failure mode for debugging/development :) you can just use a single repaint count until you have temperature sensing wired up. > The chip-on-glass has tons of registers to set drive voltages and the like, but the datasheet just gives you values to write to all of them. Oh okay - so there _is_ a controller. (I didn't know; totally ignorant about the subject.) > What do you mean by e-ink driver? Ah; I've just done some poking around, and I just realized I misunderstood things a bit when I last did some research (way too quickly, apparently) - I saw http://www.pervasivedisplays.com/images/Kits/Extension%20board/Eink%20epaper%20Extension%20kit%20by%20Pervasive.jpg http://www.pervasivedisplays.com/images/Kits/Extension%20boa... and thought I'd need to cram everything on that board onto the final design. I didn't realize the displays were more or less self-contained (with a builtin/COG controller) and could be driven directly like LCDs or VFDs etc and that that board was the "kitchen sink" test/dev breakout kit.

TD-Linux 10y ago
You do need part of that - a lot of it is capacitors wired directly to the ribbon cable, for the COG's charge pump. There's also a temperature sensing chip and a couple of external mosfets, one of which is to fix a bug on older COGs. On my own layout I was able to shrink it quite a bit by using 0603 parts. Still expect to burn 300mm^2 on the passives. https://0x0.st/tqo.png https://0x0.st/tqo.png
- i336_ 10y ago
  Ah, I see. Thanks.