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I am working on a custom-made handheld PCB based around a PI Compute Module and one of the hardest steps I have found is how to include an HDMI-to-(50pin-TTL or LVDS) driver on my PCB to run my LCD TFT 7" 1024x600 IPS panel. First I have not found any available open-source driver board, either TTL, LVDS, or parallel RGB. The only alternative I have found is the Adafruit TFP401 board, but it is only compatible with Adafruit's low-resolution (800x480) 40pin TTL screens. Higher resolutions TTL screens often come with 50 pin connectors. Also, I know the pi's MIPI display connector is closed-sourced and only works with pi's expensive and low-resolution screens.

In summary, do you know any open-source HDMI-to-TTL or LVDS driver PCB design I can use for my project? If so, could you also share the schematics and compatible list of screens available for this driver? Thank you.

Maybe I am looking at it from the wrong perspective. If you would have to add an LCD driver to your custom PCB, how would you do it?

Ruben A. Chevez
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  • There is displays with SPI interface and thats much simpler to work with, fewer pins. – Mats Karlsson Oct 13 '20 at 06:25
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    Thank you, @MatsKarlsson. The SPI interface is more common for very low resolutions panels, i.e. 2.8", 3" and maybe 5". The display I need requires a size of 7" and a resolution of 1024x600, which are usually driven using LVDS or TTL interfaces. – Ruben A. Chevez Oct 14 '20 at 03:22
  • Not really a duplicate, but check out this question: https://raspberrypi.stackexchange.com/q/848/33476 . There are tons of HDMI to LVDS boards on sale like LAMV56, LAMV29, TY2662, etc. – Dmitry Grigoryev Oct 14 '20 at 13:26
  • Thank you, @DmitryGrigoryev. There are a lot of cheap boards but what is needed is a schematic I can use to include one of these drivers into a custom PCB and the software to bootload the driver chip. – Ruben A. Chevez Oct 14 '20 at 15:25
  • @RubenA.Chevez I think "Electrical Engineering" could be a more appropriate group, try https://electronics.stackexchange.com/ I know there are more electronic engineers there and I think thats what you are looking for. – Mats Karlsson Oct 14 '20 at 15:52

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