USB Display monitor


9 posts
by alfanhui » Sat Apr 14, 2012 4:18 pm
I have tried to search for previous posts regarding this option, but it didn't seem recently mentioned or popular. Apology if its been talked about.

USB Monitor
This is a 8" usb powered and input touch display. This is interesting option to have with Pi, as it could be possible to have a screen for transport, and it leaves the HDMI free for external bigger screens. I know there may be an issue with too much information being transferred using USB, perhaps limiting other usb devices that you'd wish to connect as well.

 http://www.lilliputuk.com/monitors/usb/ 

Officiall supported with windows, but there are Linux drivers available. I am thinking of a portable navi device (from Serial Experiements Lain japanese anime)

Mobile computer

Obviously the screen I have choosen is far too big, but to be honest I didn't even know you could get usb Displays! Tell me what you think about the usage of USB Display?
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by JeremyF » Sat Apr 14, 2012 5:24 pm
1. Drivers will have to compiled for ARM

2. It will need a powered hub, as it probably requires more than 100ma.
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by SirLagz » Sat Apr 14, 2012 6:22 pm
Probably using DisplayLink or similar technology. I'd be interested in getting one to see if it would work but I can't afford one at the moment :(

I would love to have one of these connected to an RasPi just for novelty factor.
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by mahjongg » Sun Apr 15, 2012 12:53 am
Actually what these devices seem to do is to create a completely independent (second) "video card", so it does all the video creation and manipulation inside the USB "monitor". That means (unless I'm mistaken) that the GPU inside the PI isn't used at all, so 3D effects etc are out, and also probably video playback.

Didn't know that such devices existed, but if there is a market for such a device…

Further, I agree with JeremyF, its a good question to ask if a driver for such a thing really exists for linux, let alone for ARM based linux. It seems to me the device somehow has to "talk to" the x-windows manager, so it probably needs a kernel driver. Even if it simply copies the content of the VRAM of the R-PI, it also needs a driver, but in that case video playback might be possible, although with a very low framerate.
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by Phil Spiegel » Sun Apr 15, 2012 8:02 am
What about its usability simply as a "console"/teletype terminal  for "embedded-style" applications  – not everyone is wanting a games machine or video player! – they already come in a box with the DVD mechanics 8-)

There are a whole host of applications the Pi can be used for as a compact portable unit – but it needs a start-up / console display that is equally compact but which is legible – hence all the questions (awaiting answers by experiment) as to font size in video output mode as that appears to be the only alternative?  However, I"m sure it should be possible to redirect initial output to an OLED Character-based display for essential info??
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by alfanhui » Sun Apr 15, 2012 1:50 pm
Thanks for the replys. Though, it might have seemed to be a quick alternative, It possibly wouldn't be so optimal in pricing or functionality like video player. Also, taking up a whole usb slot is not good thing either.  I think its besting looking to use the pins - (GPIO is it called?) for better chance for a display. Though I have no idea how, what that involves!

Moving on!
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by SirLagz » Sun Apr 15, 2012 2:09 pm
Using GPIO to output a video display would be harder on the CPU. I recall someone on the forums saying that the only way to output video to GPIO would be to bitbang it through.

Taking up a USB plug isn't too big a deal, I would assume that most people are going to be plugging in a USB hub ( powered hopefully ) to extend the USB ports on the RasPi.

I recall seeing some drivers for DisplayLink in the kernel sources, so it's conceivable that this sort of screen could be used in Linux.

Edit - Looks like even Lenovo is jumping on this bandwagon -

Lenovo 1452DS6
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by alfanhui » Sun Apr 15, 2012 10:02 pm
SirLagz; Power to the display wasn't what i meant when I thought USB wouldn't be a good idea, I was talking about Bandwidth. Power I had already assumed would come from another source like an active hub. Its a shame that screen is huge, I was looking for more 5" or so.

So its a no go on the GPIO? I had read about the nokia n900, and its simularitys with DSI input. again - I don't know any more information.
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by SirLagz » Mon Apr 16, 2012 1:29 am
Ah, Gotcha.

Sorry, forgot about the DSI output, which is possible. However I don't think there's any doco on how to do that at the moment but I could be mistaken.

I'll let some people who are more familiar with the SoC to answer that.
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