7 Inch USB Touchscreen Showdown
by, 10-06-2011 at 10:51 AM (11015 Views)
In this second series comparing the latest 7" touchscreens we have the Xenarc 700TSU, the Mimo 720f 2G, and the Lilliput UM70C/T USB connected monitors. Check out the video below to assist you in deciding if a USB touchscreen is right for you and which one should you currently consider.
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I did end up buying and cracking open a few of these, and it wasnt very impressive. they didnt innovate much, they simply combined a couple things that were tried and true elsewhere in the computer world, and since they only need such a small resolution, it wasn't very hard. it would be almost worth the money if they externally powered it so they could give you a better onboard gpu and brighter backlight, and added much more memory to the gpu. I put them back together, boxed them up and traded them for a new hockey puck sized antenna for mobile satellite tv, like the ones made for RVs. it's starting to look like the best way these companies should be going is to just make tablet docking stations in the headrests and in the dashboard, and replace the carpc box in the trunk with a network attached storage / access point for them. the rolling satellite in my yukon is even starting to be antiquated when you think about it. as long as you're within range of decent cellular internet, all you'd need is to take your home satellite/cable dvr, which is already accessible via the net by slingbox or built in remote access in the receiver, and you have everything you need. I've seen impressive mobile internet hotspots, a 4" by 6" box in the trunk that pulls and bridges up to 3 4g high speed connections giving everyone in the car/bus/etc high speed net access. you wouldn't even need the onboard nas if you had that. then every user would have their own complete access to everything on your dvr at home, the net, all the music/movies on all the pcs in your house, etc. so I guess if you want to make money, start building headrests and dash board panels with ipad docks in them. sad to say, but that's probably the way it will be. my wife has so much time and info wrapped up in her ipad, I sometimes wonder if she would be able to function without it.Do these USB monitors play well with others? Considering combining two of these USB monitors with a VGA monitor in a multi-zone setup.
ok, I'll bite. I have grown partial to xenarc, but i don't like that one. I want a 3rd gen model w/o composite or dc jack, the same size as the others. I spent 5 years writing firmware and drivers for high end networked DVRs (16ch types for surveillance cameras). Much time was spent on the USB drivers, it was always a big decision which features to spend the USB 2.0 resources on. At first it was just for external drives (saving files / video clips transferred from hdd & attaching external usb hdd's to expand storage), then it moved on to networking the dvr's via USB. When you had 4 dvrs, connecting them together via usb made them act as one 48 channel dvr you could control with 1 joystick/control, and it would show up as 1 system when you logged on remotely over the network or internet. This required video feeds to be buffered across the usb between dvr's and allowed 1 dvr to be the master, giving it control over all of the video cards in the other dvrs across the same usb, So the same restrictions we faced with the dvrs they faced making these monitors. The playback had to be buffered because of the massive amount of code required just to operate the gpu's (video cards) in the other units. Since these monitors have internal video cards, the only thing I can think is they are using the onboard RAM to buffer the video. That, and they could be using one of the newer compression formats that weren't available (or stable yet) 5 yrs ago, like the h.264 format the current model dvrs use. The company permanently "loans" me the newest model still, until the next comes out, in exchange for me taking a look at the code some guy in India or Korea wrote for them @ $2.25 / hr. The new dvrs that have the h.264 compression blow everything else away by a long shot, so with the ram on the internal video card, and the giant leap forward in compression I understand it's possible, and now it's worth ~$400 for me to find out how exactly they did it. I've been rambling on about the data/bandwidth... I still have no idea how they are powering the circuitry, lcd, backlight, touch input device, onboard gpu, etc with the same amount of current that we could only manage to power a usb dvdrw/hdd or hardware compression circuit with. If it really stands up with a vga model, that has none of the power or bandwidth restrictions it's quite an achievement. Everyone that codes drivers/firmware for new usb devices has been frustrated by it's limitations, having that much going on, and coexisting peacefully on a usb2.0 cable is no small feat, and the fact that it's been done will influence the next peripheral bus standard, giving more attention to powering the devices it connects to. Like I said before, I have a $200 usb vga card that is garbage, I didn't think usb2 had the balls. I'm gonna order one of the other 2 models, check out the firmware and driver code, then crack it open on the bench and find out how much power each device is getting. It's a weird reason to order one, but I hafta know! -- Thanks for the reply -- eric