Questions tagged [displayport]

Questions relating to DisplayPort, a digital display interface that can also carry audio and other data.

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Confusion with mini displayport

I am designing a board which converts DisplayPort to LVDS, in order to drive cheap panels from older notebooks or off ebay. DP is free of charge, compared to HDMI, and a simple converter IC is ...
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1answer
113 views

Does USB-C Alternate Mode require the Billboard Device to be always connected?

I'm working on a device design that operates in USB-C alternate mode as a displayport dongle. As such it requires a USB 2.0 billboard device to be present to negotiate with the host and enter alt ...
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28 views

Trace width for breaking out 100Ω differential microstrip from 0.5mm pitch BGA

See bottom of post for the actual questions First, some context: I'm making a DisplayPort switch as a hobby project DisplayPort's high speed lines require 100Ω ± 10% differential impedance, which I'...
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DisplayPort without AUX channel

Reading the VESA 1.2 spec it seems that the AUX channel may not be essential to the correct functioning of the video channel, i.e. if we already know the EDID data and don't need to do any calibration,...
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26 views

Common mode choke/ESD protection for internal eDP connection?

In a hobby design I'm putting together, I have to connect a 4-lane eDP LCD panel to the motherboard with a cable about 60cm long. I can ask the cable manufacturer to use shielded twincoax for the ...
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1answer
132 views

Does DisplayPort support scaling natively?

In the DisplayPort Wikipedia page, in advantages section it is stated that "Can drive display panels directly, eliminating scaling and control circuits and allowing for cheaper and slimmer displays". ...
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117 views

LVDS data rate to TFT

I have a two LVDS Ports (A & B) coming from deserializers connected to a 10.25" TFT display. lvdsaclkp, lvdsaclkn, lvdsa[0:3]p/n lvdsbclkp, lvdsbclkn, lvdsb[0:3]p/n VESA: JEITA: What is the ...
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1answer
38 views

USB TYPE-C ALT-MODE DisplayPort + USB 2.0, is it supported?

DipslayPort 4 lanes are supported through usb type-c alternate mode. USB power delivery and usb 2.0 is always supported with the displayport alternate mode. Powerdelivery is not crucial however usb ...
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131 views

What is needed to convert 2 DisplayPort lanes into 4?

Essentially, I'm trying to connect a source with only two HBR2 lanes to a device that requires four HBR1 lanes. Theoretically, the bandwidth is there. But what kind of an IC would I need to accomplish ...
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1answer
190 views

Does polarity of differential DisplayPort signals matter

I am routing a DisplayPort interface. I know from PCIe that the polarity of the differential pairs does not matter. So if it is helpful during routing I can connect the n to the p pin and vice-versa. ...
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1k views

Wiring Embedded Display Port (eDP) to a full-size Display port

In spare time, I repair laptop computers. Pretty much all of the screens in them now use this "eDP" Display Port technology and I thought "this could turn out to be great for troubleshooting" because ...
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68 views

Why would data transferred through an extension cable be different [closed]

This is something that has been bothering me especially when dealing with the latest cables made for DisplayPort or HDMI. I understand that issues can occur with adapters since you might be dealing ...
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2answers
132 views

Do HDMI/DVI and DisplayPort transfer only differences or full frames?

Let's assume I have a static computer desktop on my external display that is attached by HDMI (or equivalently, it could be attached by DVI, as DVI and HDMI are compatible). The 60Hz picture doesn't ...
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1answer
781 views

Displayport clock recovery

The displayport protocol runs at a fixed frequency of either 1.62GHz, 2.7GHz, or 5.4GHz. The pixel stream (strm_clk) it carries runs at an arbitrary frequency and is likely to be asynchronous to the ...
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1answer
100 views

Creating a displayPort Signal

I am attempting to create a displayPort source signal from scratch. I just read through the 1.1 Specification (which is outdated and free on the displayPort website) and it gave a decent overview. ...
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12k views

Disabling DisplayPort hot plug detect

I have a PC with a DisplayPort monitor. When the monitor sleeps or is powered off, the OS loses track of the current display resolution. My research indicates this is probably due to the Hot Plug ...
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2answers
5k views

Why DisplayPort cables must isolate the power pin?

I've been investigating why my 2560×1440 DisplayPort monitor and my mini-DisplayPort MacBook Air don't play along, and, it turns out, this is likely due to a wire in the cable that connects the two ...
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1answer
3k views

Converting DisplayPort to 24 bit RGB parallel. Possible?

Is it possible to interface a DP1.1 complaint source to a TFT Module that uses 24 bit RGB? I'm investigating the possibility of interfacing an Atom D2550 with This Display. I have 3 options to ...