Expected refresh rate at 3440x1440


#1

I’d like to know what kind of refresh rate I can expect if I buy the 4K, USB3.0 -> DP adapter if I try and drive an LG 3440x1440 screen?

My (rather uninformed) maths thinks that I should get at least 50Hz, if not 60Hz. I’d appreciate some sort of official confirmation from you guys before I press the button on this (and the monitor too!).

Many thanks,
Pete


#2

Hi Pete,

Excellent question - thanks for posting!

When I spoke with DisplayLink previously, they indicated that 3440x1440 would refresh at 30Hz - though at the time they didn’t yet have a monitor of this resolution to test with for confirmation. However we’ve had one customer report that they were able to achieve a 50Hz refresh rate, so there’s some conflicting information here.

I’m going to ping our DisplayLink engineering contact and see if they’ve obtained a display with this resolution to confirm the expected refresh. They’re in the UK and sometimes it can take a couple of days for a response, but I’ll post an update once I hear back from them.

Thanks!
Gary


#3

Hi Gary,

Thanks for the response, I really hope that we can find a way to get 50Hz out of the DisplayLink chip. I have an otherwise-fantastic laptop which I don’t want to have to replace yet, and the lure of a huge monitor like the LG is very strong indeed.

I look forward to your update. Thanks again.

Peter


#4

Hi Pete,

Good news! It looks like 3440x1440@50Hz should be possible with the adapter.

(The key factor here is the “pixel clock” - the proposed resolution/refresh will require a ~270MHz pixel clock which is below the maximum 300MHz rate supported by the adapter.)

As this resolution becomes a bit more widespread, I’m sure this question will come up again, so I’m going to start updating product pages and amazon listings to clarify things.

Thanks!
Gary


#5

Cheers Gary,

Looks like my maths wasn’t too bad then - I did a check that 4096x2160x30 > 3440x1440x50 and hoped I was on the right track!

That’s really good news, I think these wide monitors are going to become more widespread, especially for software developers. It’s going to be great to replace two monitors with a single one that will be able to play widescreen movies too.

Thanks for confirming it - I’ll get my order(s) in.

Peter


#6