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Author Topic: eDP controllers  (Read 572 times)
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« on: June 26, 2017, 08:51:49 PM »

I'm guessing that no one knows of any universal eDP controllers out there like there are ones for LVDS lcds. I know NJYTouch has some for some popular eDP based screens but it unfortunately runs off 12v. I'm curious about the one from the Abusemark website though. I know some people here have dabbled with them. I'm curious if the Display Port on those boards can be converted to HDMI with the use of a normal DP->HDMI active adapter purchased from anywhere. On their website they sell a "customized" DP adapter or an HDMI revision of the board but both cost quite a bit extra. Anyone have any experience with that?
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« Reply #1 on: June 27, 2017, 06:51:38 PM »

As far as I know, eDP digital interface is almost identical to DP port. Major differences are:
- different cables and connectors,
- eDP must provide power for crystals (LCD) and LEDs (backlight) while DP only sources video,
- flat panel need control interface for backlight power (different sources describe this as extra wires or embedded protocol) while tegular monitor may be controlled by buttons or PC (depend on implemented features).

Any errors in spelling, tact or fact are transmission errors.

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« Reply #2 on: January 04, 2018, 02:48:53 PM »

Some necro for future references.

This has been done with iPad panels, look around Hackaday.
You can wire the eDP screens to full DP. Leave HDMI alone, it's a bastard normie smart TV standard that should die a fiery death. It's essentially identical to one of the DVI cable options. DP is far superior to both.

You need a breakout board with a panel tape connector soldered on it to separate the power pins and the signal pins.
Power pins need a power source that can deliver enough juice to drive the backlight and a power regulator if you want to be able to dim the screen.
Signal pins need to be connected to standard DP cable with matching pin layout. Be wary of path lengths. DP opeates on high frequencies so path lengths are important, otherwise you'll get funny artifacts.
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