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  • 4DPi-32 + playing videos

    Hello,

    I'm building an artistic installation and this time I bought a 4D PI35 Display module to work with PI2.
    It seems to be working.
    I even got video playing now )

    However there is a serious issue with viewing angles.

    When watching from the right, it seems ok from almost any angle.
    However from the left the image disappears at 35 degrees and then if you move further turns negative!

    Do I have a faulty screen or they are all like that ??



    Thanks
    M

    ps it is PI35.. not PI32 as subject says...
    Last edited by SFR75; 24th September 2016, 05:38 AM.

  • #2

    Hi M,

    Good Day.

    Thank you for using our products.

    With regards on how to play Video on the Raspberry Pi.

    You need to install the mplayer2

    On Terminal or SSH
    sudo apt-get install -y mplayer2

    Then you also need to install the fbcp, fbcp takes a snapshot of /dev/fb0, copies it to /dev/fb1
    sudo apt-get install cmake
    git clone https://github.com/tasanakorn/rpi-fbcp
    cd rpi-fbcp/
    mkdir build
    cd build/
    cmake ..
    make
    sudo install fbcp /usr/local/bin/fbcp

    You need to start the fbcp service first, before playing the video

    sudo service fbcp start
    omxplayer yourVideo.mpg

    And with regards to the viewing angle, it depends from which side you are viewing the Display. Our display is a 6 o'clock display,and the optimal viewing is from below when it is in portrait mode.

    Regards,

    Ferdinand

    Comment


    • #3
      Hello,

      Thank you for a detailed answer about video. I will try that with omxplayer.
      Mplayer works.

      Originally posted by frsantiago View Post

      And with regards to the viewing angle, it depends from which side you are viewing the Display. Our display is a 6 o'clock display,and the optimal viewing is from below when it is in portrait mode.
      Now regarding viewing angle. As with any display, I would like image to be visible from any angle.
      This particular screen is quite extreme when it comes to viewing angles range.
      Actually it's the first time I see screen with such reduced vision angle.
      I wonder if it's related to the way polarizing filters are placed or it has nothing to do with this ?

      Thanks!
      M

      Comment


      • #4

        Re: 4DPi-32 + playing videos

        Hi M,

        Good Day.

        Our 4DPi-35 uses TN or Twisted Nematic Panel Techology. Its is more economical than other types like IPS for comparison and changing state quickly giving the best response time of all other LCD technologies. But it has a limited viewing angles specially in vertical direction. Viewing from below the display can be very dark and looking at it too far from the top, the contrast can reverse itself, allowing light to dark shades and vice versa.

        Hope this helps.

        Regards,

        Ferdinand

        Comment


        • #5
          Hello Ferdinand.

          Thanks for the explanations.
          I followed your instruction, however I can't manage to start fbcp as service
          when I type
          "sudo service fbcp start", it says "unrecognized service"... :-(

          I also wonder about brightness control. My jumper is in PWM position (it was like that by default).

          Tried to follow datasheet pdf instructions "sudo echo 255 > /sys/class/backlight/4dpi-32-pwm/brightness", but it doesn't work.
          Looks like the maximum value is not 255, but 100 ?
          (that's the value that /sys/class/backlight/4dpi-32-pwm/maxbrightness contains).


          So how do I change the brightness ?

          Thanks,
          M
          Last edited by SFR75; 2nd October 2016, 12:53 PM.

          Comment


          • #6

            Hi M,

            Good Day.

            Please add this to the step, connect to your RPi via SSH, then goto the folder rpi-fbcp/build

            On SSH,
            cd rpi-fbcp/build
            sudo wget -O /etc/init.d/fbcp https://gist.github.com/notro/eac0fe...a045084be/fbcp
            sudo chmod +x /etc/init.d/fbcp
            con2fbmap 1 0
            sudo service fbcp start

            Then play a movie using omxplayer.

            With regards to backlight control, you need to change the file type first to change the content of the file.

            On SSH,
            sudo chmod 777 /sys/class/backlight/4dpi-32-pwm/brightness
            sudo echo > 50 /sys/class/backlight/4dpi-32-pwm/brightness
            cat /sys/class/backlight/4dpi-32-pwm/brightness

            The value is from 1 to 100 when turn on and 0 if you want to turn off.

            Regards,

            Ferdinand

            Comment

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