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Very Strange Effect with D* and 3D Glasses

Discussion in 'DIRECTV General Discussion' started by SomeRandomIdiot, Sep 4, 2010.

  1. SomeRandomIdiot

    SomeRandomIdiot Godfather

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    Jan 6, 2009
    I have noticed something very strange using Mitsubishi/Samsung 3D Glasses - not really an error - but wondering if anyone can explain it.

    I have a number of STB and other pieces of electronics in the same room as my 3D-TV.

    While viewing 3D programming, I noticed that the blue ring, power, resolution and even the record LED "sparkled" on my HR-20, HR-21 and HR-23. Upon closing one eye, its obvious what is happening. The lights all cycle in 1 second cycles, going from full off, growing in brightness, peaking and then declining in brightness.

    The left and the right eyes are offset in the cycle, giving the "sparkling" effect one sees with both eyes.

    To make it even stranger, NO OTHER ELECTRONICS LED shows this effect. This includes the H2x DirecTV STBs.

    To me, as the glasses cycle 120 times a second, it really makes no sense to me why this is happening in a 1 second cycle - and even stranger that the L&R cycles are out of phase.

    Can anyone explain what is going on - and why are the Directv HR2x units the only electronics to show this?

    Also, can anyone tell is it happening with Panasonic 3D Glasses as well?
     
  2. Impala1ss

    Impala1ss Godfather

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    Jul 22, 2007
    I can't explain but I also can not see a complete number on my LED clock which sits on top of my components.
     
  3. GregLee

    GregLee Hall Of Fame

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    Dec 28, 2005
    I see this also, on my HR24. And my LCD clock is unreadable with 3D glasses on. I don't know what is going on --- some sort of beats, I guess.
     
  4. Nick

    Nick Retired, part-time PITA DBSTalk Club

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    Apr 23, 2002
    The...
    Sounds like a "feature" to me. Don't let Directv know or they'll charge you a monthly fee for it.
     
  5. SteveInNC

    SteveInNC AllStar

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    Oct 8, 2007
    I suspect that the LEDs are being driven by some form of pulsed or clocked circuit. It just so happens that your glasses are switching frames slightly out of sync with the LEDs, so over time, the duty cycle (time on and off) of the glasses shifts to match more of the duty cycle of the LEDs, making them appear more "on" gradually as the cycles sync up, then fading out again as the cycles drift apart. The lens elements on your glasses are likely 180 degrees out of phase so that they can alternate which TV frame you see, so when one side shows the sparkling LEDs full-on, the other should show full-off or dimmest.

    As to the clocks, the circuits driving addressing of clock number segments are very often incremented individually, much like stepping through computer memory and powering (or not) that particular cell depending on the digit you are displaying.
     
  6. Jeremy W

    Jeremy W Hall Of Fame

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    Jun 19, 2006
    I noticed this as well. It's a pretty cool effect.
     

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