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How do these smart phones change screen position

Discussion in 'Electronic Design' started by [email protected], Jan 18, 2013.

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  1. Guest

    How do these smart phones change screen position?

    What I mean, is that when the longest part of the phone is vertical then
    the phone is tipped to the horizontal position, the screen image
    rotates, so the bottom of the page is always downward. How the heck is
    tht done? My only guess is that its mercury switches.....
     
  2. Guest

    On Friday, January 18, 2013 3:10:52 PM UTC-5, wrote:

    Are you serious- mercury switches??? It almost has to be a magnet attached to pendulum hovering over a Hall effect sensor.
     
  3. Guest

    Accelerometer.
     
  4. Guest

    Don't write off Hall-effect technology just yet. This chip is used for the compass function:
    http://www.asahi-kasei.co.jp/akm/en/product/ak8975b/ak8975b.html
     
  5. Guest

    think they all have, it's used for many games so it is a must have
    feature ;)

    Where as an antenna is something you add at the last moment if there's
    room left

    I just saw someone who had tested the big name smartphones in a
    standard setup
    with an artificial hand and head, the newer the phone the worse the
    sensitivity


    -Lasse
     
  6. Most phones now have at least 3 axis accelerometers, plus 3 axis
    compass. You can get all that plus 3 axis gyros in one chip like the
    Invensense MPU9150.
     
  7. Jamie

    Jamie Guest

    http://en.wikipedia.org/wiki/Magnetometer

    Jamie
     
  8. Guest

    It was a danish guy, I'm not sure if it a test standard they are
    developing, but it is done with a hand holding the phone next to
    a head, you known the way phone is normally used ;)


    -Lasse
     
  9. Jasen Betts

    Jasen Betts Guest

    some may, others work by thermal convection.
     
  10. Jamie

    Jamie Guest

    If you say so. I can tell you that I have 3 devices
    that use fluxgates for compass and device position orientation.

    2 of them have acceleration sensors but those are only for the
    HD park and screen wake up.

    Jamie
     
  11. The iPhone and iPad have a 3-axis MEMS accelerometer, a 3-axis MEMS
    angular rate sensor AND a 3-axis Hall-effect compass. All the iPhones
    and some iPads also have GPS. Some Android devices have a barometer
    that is good enough to function as an altimeter.

    You can get and IOS clinometer app that has a resolution of 0.1
    angular degree and some nice 2-axis bubble level apps. The compass is
    a bit flakier- influenced by metal such as computer boxes and by the
    magnets that Apple put into the iPad covers (dunh).

    The accelerometer is great for orientation relative to gravity (roll
    and pitch), but, of course, completely useless for yaw.

    Display orientation is controlled by the accelerometer.




    Best regards,
    Spehro Pefhany
     
  12. Jamie

    Jamie Guest

    Oh really? how strange.. Works for us for angle sensing.


    Jamie
     
  13. rickman

    rickman Guest

    No, they use weighted pixels so they shift when you turn the screen.

    Rick
     
  14. Guest

    This seems to be the generally agreed answer to this question. However
    I have no clue what these things are. Being silicone, they must be a
    chip, but how do they work? Any chip or semiconductor works in any
    direction and does not change the circuit when the chip or item it's in,
    is rotated. Could you please explain how they work. Thanks
     
  15. Jasen Betts

    Jasen Betts Guest

    I could but i's just be paraphrasing the manufacturer's documentation.
    they invent these things, patent them, and then brag about it in the
    datasheet.
     
  16. Accelerometers generally have a proof mass and a flexure, and they
    sense displacement (capacitive is the usual method on a chip). Pretty
    simple concept. Getting to three axis on a monolithic structure gets
    more interesting:-

    http://www.public.asu.edu/~jchae2/Publications_files/3axis accel JMEMS05.pdf





    Best regards,
    Spehro Pefhany
     
  17. josephkk

    josephkk Guest

    Actually, usually two or three. More than enough to reasonably the
    accelerated field we live in.
     
  18. josephkk

    josephkk Guest

    Cite?
    Otherwise "Baloney"! Bloody insufficient space and overwhelming other
    thermal drives make that unbelievable.

    ?-)
     
  19. josephkk

    josephkk Guest

    +2

    ?-)
     
  20. josephkk

    josephkk Guest

    Cool.

    Jeff, enclosing the links in carets is ok for email where HTML is accepted
    but worthless in usenet where HTML is not acceptable. Your choice, just
    thought to explain why.

    ?-)
     
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