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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    Rich Felker‏ @RichFelker Jul 11

    How is it that unbearably low-res hobby/project LCDs are expensive but high-DPI "retina" iPhone screen replacements are $10 each? Anyone have adapters to drive the latter?

    11:10 AM - 11 Jul 2018
    • 1 Retweet
    • 5 Likes
    • Jon Roelofs 🎃 p-zombie Damien Miller Maxime Borges Oğuz Meteer Kurt "Fights Computers" Mosiejczuk
    2 replies 1 retweet 5 likes
      1. New conversation
      2. Robert Ou‏ @rqou_ Jul 11
        Replying to @RichFelker

        Yes: https://hackaday.io/project/364-mipi-dsi-display-shieldhdmi-adapter … but YMMV

        2 replies 1 retweet 7 likes
      3. Rich Felker‏ @RichFelker Jul 11
        Replying to @rqou_

        Nice. But it needs to be an integrated product, preferably in tiny form factor, before it's practical IMO.

        2 replies 0 retweets 0 likes
      4. Bert “xistence” Regeer‏ @bertjwregeer Jul 11
        Replying to @RichFelker @rqou_

        And that's where your cost is...

        1 reply 0 retweets 0 likes
      5. Rich Felker‏ @RichFelker Jul 11
        Replying to @bertjwregeer @rqou_

        If it were an ASIC you could make them for a few cents each at scale (would require large-scale products integrating cheap iPhone screens). Existing design could probably be minified putting more of it in the FPGA, reusing existing tiny FPGA board.

        1 reply 0 retweets 0 likes
      6. Bert “xistence” Regeer‏ @bertjwregeer Jul 11
        Replying to @RichFelker @rqou_

        Rich, don't take me the wrong way, but you asked why iPhone replacements were only $10. That's because the screen is dirt cheap, all the circuitry to drive it though is what is expensive. Someone out there has to build the code to drive it, then spin an ASIC (at scale). $$$$$$$$$

        1 reply 0 retweets 0 likes
      7. Bert “xistence” Regeer‏ @bertjwregeer Jul 11
        Replying to @bertjwregeer @RichFelker @rqou_

        No-one targeting the market that is looking for small screens is going to see a return on their investment anytime soon. The smaller screens generally come with a piggyback board already designed that was churned out in China years ago.

        1 reply 0 retweets 0 likes
      8. Robert Ou‏ @rqou_ Jul 11
        Replying to @bertjwregeer @RichFelker

        This is only partially true. These MIPI displays already contain quite a bit of complicated driver circuitry in them. It's true that no hobbyist can compete with the scale of Apple, but it's definitely possible to make a reasonably affordable adapter.

        1 reply 0 retweets 2 likes
      9. Rich Felker‏ @RichFelker Jul 11
        Replying to @rqou_ @bertjwregeer

        I don't know, and that's why I asked, but I find it difficult to believe the controller logic is the difference in cost. It seems more likely that one market just hasn't caught up to the economy of scale of the other.

        1 reply 0 retweets 0 likes
      10. 3 more replies
      1. Arvid E. Picciani‏ @arvidep Jul 11
        Replying to @RichFelker

        Panels are cheap and alot of maker boards have lvds outputs for driving them directly. HDMI on the other hand is expensive because the use case doesn't exist at scale.

        0 replies 0 retweets 0 likes
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