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Twin-screen tablet (back-to-back)?

Discussion in 'Electronic Design' started by tutu, Mar 22, 2013.

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  1. tutu

    tutu Guest

    I want a tablet that it can hold between myself and other people with
    a screen on each side showing the same thing.

    I could buy a lilliput monitor and attach that but it out-weighs and
    out-costs a tablet of sufficient capability to create what I need to
    show. I've been looking for an hdmi input bare screen module but the
    only thing I saw had another board and needed power case yada yada
    ....too big and too much bother and not as cheap as a stupid 7 inch

    I tried vnc from an android tablet server to a bbplaybook client and
    video streaming wasn't fast enough over my wifi, plus there may not
    even be an accessable router sometimes, and power is battery.

    What would seem possible would be a cheap tablet to be the
    slave-screen and some sort of usb connection, fast enough for video?

    Has anyone gone this route already, what software did you use, did
    video stream ok...
  2. hamilton

    hamilton Guest

    Please share what program you want to see on both tablets.

    If the program can be a web browser, making one tablet a server, then
    both can view the same page over wifi.


    PS: Sounds like a sales gimmick to me.
  3. Digger

    Digger Guest

    The bottom line of course is that it may not be a WiFi problem at
    all...I stream video throughout my entire home, from an NAS box,
    including to an SGII Captivate without problems. Thus WiFi speeds,
    served over a LAN based network, should not be a problem for anyone
    these days if using 802.11n/ or 802.11ac based router.

    So, not having any specific info on your hardware/ video/ and software
    combo, it's rather difficult to know where the bottleneck lies.

    1) Can you stream/ display 1080p video from YouTube, NetFlix, Hulu, NBC,
    ABC, or any other source, to your tablet without issue? If you can, then
    WiFi over LAN is not the issue, nor is your hardware.

    2) Tunneling into a home based network from outside your own LAN will
    never give you the bandwidth necessary to serve high res video without
    problems, regardless of how good your hardware is. Typical upload speeds
    for consumer based internet access points are far too low in bandwidth
    to support such a capability.

    Cloud based services are actually your best shot at streaming high res
    video across WAN. You really should consider a commercial service with
    higher upload speeds available to your server.

    3) The best solution to part of your quest is indeed a dual monitor
    configuration of some sort, as I personally know of no dual-faced
    display hardware device available for your purpose.

    This would incur additional hardware resources and expense to handle
    streaming traffic, decode, and output to HDMI and/ or splitter ->
    monitor(s). Feasibly one could take most any WiFi extender, laptop, or
    full USB tablet and create a singular access point from which to connect
    multiple displays. There are indeed tablets available on the market
    today that do fully support USB, and added Bluetooth services, limited
    only by the scope of the current operating system in use. Feature sets
    do vary dramatically by both vendor and price...

    4) Serving network streams via WiFi would easily and cheaply satisfy
    most of your requirements, but the streams would not be in-sync with
    each other regardless of all other factors. Propagation delays may or
    may not be problematic...not sure if that really matters.

    4) Added notes on hardware:
    An Arm v7 1GHz Dual Core processor, for example, is actually not fast
    enough for full high res video streaming, factoring in display
    capability, native screen resolution and a host of other factors
    including optimized codecs, and player. So, depending upon your own
    hardware capability, you might need to consider converting native video
    sources to a much more mobile device friendly format. This assumes of
    course one is willing to spend the added time necessary to pre-process
    the video content.

    Although I'm quite sure this is not really an answer to your current
    dilemma, perhaps something said will prove helpful...
  4. tlvp

    tlvp Guest

    You want what Amazon was noising about not quite a year ago:

    : Amazon is working on a dual-display Kindle tablet
    : <>

    But I don't think they're there yet with their hardware. HTH. -- tlvp
  5. Jasen Betts

    Jasen Betts Guest

    router??? if you're using the internet you're definately doing it wrong!

    Put the hotspot inside the tablet, it's just software. drastically
    reduced range should reduce power consumption too.
    should be possible if the tablet has a USB on-the-go port, dunno what
    softwre would be needed for the tablet to emulate a usb display device.
    how good do you need the video to be on yuor side?
  6. tutu

    tutu Guest

    Not exactly - what I want is to use the tablet for video instruction
    in a phys-ed program. A slave screen - glued to the back of the
    tablet, connected to the hdmi out of the tablet (and the tablet set
    to oupt on both its internal screen and the hdmi port) - would work
    exactly right. The cheapest such hdmi screen is bigger and more
    costly than a cheap tablet.

    And the relative height of the instructor (me) and the student(s) is
    such that back-to-back screens are fine for viewing angle.
  7. I use this:

    RAVPower RP-WD01 Wireless WiFi-Disk & Built-in 3000mAh Li-Polymer Battery

    You can find it at Amazon and Newegg, just search for RavPower Wifi Disk.

    Turn it on and plug in your external memory device: SD card, flash
    drive, even a portable hard drive. It creates its own wifi network and
    will stream the content from the memory device to up to five
    individual devices. All you have to do is install the app onto each
    device, then log into the disk's wifi network and choose the content
    you wish to stream. It can stream content up to five hours off its
    built-in battery. It's an incredibly handy device, just a little
    smaller and thinner than the typical portable hard drive.

    Cheap, too. It's currently going for $50, but Newegg occasionally has
    it for $40.
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