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Re: 4.41 inch ePaper Display for the rPi

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rickman <gnuarm@gmail.com> wrote:
> I think using a big MCU chip to drive a low power display over an SPI 
> port is a bit of overkill.  These displays come in families and I have 
> only found one family of ePaper displays that work over an extended 
> temperature range.  The larger displays in this family have exactly one 
> display controller (board and chip) and that is provided by a third 
> party, resold by the display maker.  Oddly enough it seems the 
> controller chip is not rated for the same temperature range as the 
> display.  So although they have an extended temperature range display, 
> there is no extended temperature range controller for it!

You didn't say the panel spoke SPI.  Is this it:
http://www.pervasivedisplays.com/LiteratureRetrieve.aspx?ID=214528
I'm a little unsure why it speaks SPI but also needs a timing controller
(TCon) as well.  Does the display need refresh (like traditional hsync/vsync
timing) with the SPI just being state changes, or are they more closely
related?  Could you run the SPI from the CPU and the timing from a
CPLD/FPGA?

> I'm going to use the lack of an extended temperature range controller 
> (board or chip) as a lever to get the spec for the display and maybe I 
> can roll my own in an FPGA.

That's probably a useful strategy.

> I'm not sure why you are talking about HDMI or RGBHV.  These are purely 
> black and white displays, not even gray scale.  They are not refreshed 
> on a regular basis, only updated when needed and take about a second to 
> redraw the screen.

Since we're on the RPi group, most people are going to assume you're wanting
to show the Pi display on the e-paper panel, which means HDMI-to-something
conversion.  If it's as SPI then it's just a peripheral, so nothing
particularly Pi-specific here, except perhaps in terms of code to drive it.

Theo

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Re: 4.41 inch ePaper Display for the rPi Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-18 22:39 +0000
  Re: 4.41 inch ePaper Display for the rPi Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-19 19:10 +0000
    Re: 4.41 inch ePaper Display for the rPi rickman <gnuarm@gmail.com> - 2015-06-19 15:34 -0400
      Re: 4.41 inch ePaper Display for the rPi Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-19 20:36 +0000
        Re: 4.41 inch ePaper Display for the rPi Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-19 23:22 +0000
        Re: 4.41 inch ePaper Display for the rPi Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-19 23:58 +0000
          Re: 4.41 inch ePaper Display for the rPi hamilton <hamilton@nothere.com> - 2015-06-19 18:25 -0600
          Re: 4.41 inch ePaper Display for the rPi rickman <gnuarm@gmail.com> - 2015-06-19 22:44 -0400
            Re: 4.41 inch ePaper Display for the rPi rickman <gnuarm@gmail.com> - 2015-06-20 13:29 -0400
        Re: 4.41 inch ePaper Display for the rPi cl@isbd.net - 2015-07-29 10:26 +0100
          Re: 4.41 inch ePaper Display for the rPi cl@isbd.net - 2015-07-29 21:21 +0100
            Re: 4.41 inch ePaper Display for the rPi rickman <gnuarm@gmail.com> - 2015-07-29 17:18 -0400
              Re: 4.41 inch ePaper Display for the rPi cl@isbd.net - 2015-07-30 10:23 +0100
                Re: 4.41 inch ePaper Display for the rPi Rob <nomail@example.com> - 2015-07-30 11:14 +0000
                Re: 4.41 inch ePaper Display for the rPi Dom <domafp@blueyonder.co.uk> - 2015-07-30 12:55 +0100
                Re: 4.41 inch ePaper Display for the rPi cl@isbd.net - 2015-07-30 13:15 +0100
  Re: 4.41 inch ePaper Display for the rPi Theo Markettos <theom+news@chiark.greenend.org.uk> - 2015-06-19 20:27 +0100
    Re: 4.41 inch ePaper Display for the rPi rickman <gnuarm@gmail.com> - 2015-06-19 15:57 -0400
  Re: 4.41 inch ePaper Display for the rPi Martin Gregorie <martin@address-in-sig.invalid> - 2015-06-19 19:31 +0000

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