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Smartphone panel as an EVF/monitor, DIY
  • (posted this in another forum, but I think the DIY discussion are more robust here)

    As my cameras/rigs have been getting smaller and lighter (BMPCC and GH4), most of the readily available monitors seem hopelessly large and clunky, expensive and underpowered.

    Even my personal favorite DP-6, which seemed impossibly svelte when new, now feels heavy, chunky and unwieldy. I recently built my own BMPCC/GoPro lightweight gimbal, and that's an especially good candidate for a small/light screen.

    Although there are hopeful signs pointing the right direction (Ursa Viewfinder if it ran off a 9v / HDMI, SmallHD 502/Sidefinder), many people like me just wish they could use their smartphone as a monitor.

    Or better yet, what about just using a smartphone LCD or OLED screen? The main problem seems to be the secretive, closed MIPI standard that most phones and tablets use.

    I've been following this Hackaday project for awhile, and they look to be on the verge of selling a commercial controller to take an HDMI input and run a MIPI DSI panel:

    https://hackaday.io/project/364-mipi...ldhdmi-adapter

    There's a poll up right now to gauge interest, and see which panels to support out-of-the-box, among the iPhone 4, 5, Galaxy S3/S4, and Droid DNA:

    http://doodle.com/uv283rp366prppnt

    No pricing yet, but the Bill of Materials is under $40, so my best guess is the board will sell for less than double that. I really like the idea of being able to buy a cheap smartphone replacement panel (>$25 for iPhone 4/5, >$80 for 1080p Galaxy), adding a 5v micro-USB power source (that can run for hours and hours, maybe days), and slapping it in a SUPER thin 3D-printed enclosure.

    It may not be a fancy turnkey solution, but the possibilities are interesting. The Spartan-6 FPGA that it's based on should have plenty of horsepower to support all the advanced monitor features, if some enterprising coder wants to write custom firmware for guides, peaking, false color, histograms, LUTs, etc. etc. My two main cameras have most of that built-in, so 90% of the time, I just want a nice, bright monitor to frame and focus. They're already talking about testing the 2560x1440 Galaxy Note 4 screen, so there may be some 4K possibilities out of this little board, as well.

    What do you folks think?

  • 12 Replies sorted by
  • It is really hardcore DIY.

    Conversion works up to 720p@60 Hz or 1080p@48 Hz.

    Plus this. I mean lack of 1080p50/1080p60 even.

    Isn't it older thing? http://hackaday.com/2014/11/02/using-cell-phone-screens-with-any-hdmi-interface/

  • You're right, Vitaly. The project's been out there for awhile now. The source files have been on GitHub for months now. What's new is the post from 2 weeks ago that they've "...found an industrial partner to manufacture and ship..." That means, you can soon buy a complete board, plug in a supported panel (into the daughter card for that panel), power it up and display HDMI. Will it support the BMPCC's 10-bit uncompressed? I don't know. Will it rotate to landscape automatically? Don't know. Most MIPI displays, as I understand it, scan in portrait orientation. Will it be further programmable down the road? Lots of questions, but the possibilities do interest me.

  • I really wish them to succeed. But if you ask me - much better idea is to make HDMI input with H.264 encoder and USB 2.0 output. So you could plug it to any tablet or phone and it will work (using supplied software, of course, but H.264 hardware decoders are standard on most devices now).

  • @Eimulis

    It is PC one. Much better PC grabbers exist.

  • SD version seems possible

  • 4,3" hdmi screen with USB input for power and 800x480 panel, 64€ (project already and backed andadeveloped) https://www.kickstarter.com/projects/1924187374/manga-screen-multi-touch-43-lcd/rewards Interesting but resolution and sise is a bit small..

  • This one is quite exotic.

  • @Adam_Mercier Did you receive it?

  • Yes, Not working with GH3 but works very well with a laptop or desktop... in playback mode it can display some things but the displayed image is larger than the screen. Even when selecting 800*480p outpout NTSC it does not work. Pity because the screen is very nice and bright. Apparentely the issue is caused by EDID data on the screen, wich is serial-port programmable, i've tried some settings but I have no idea what the GH3 is expecting!

  • Thanks for your feedback!

    Pitty it doesn't work...