Bright stripe on LCD display

Discussion in 'Electronic Equipment' started by DaveC, Jul 26, 2013.

  1. DaveC

    DaveC Guest

    This is a ~ 4 year old HP Pavilion laptop with LCD display.

    There is a bright vertical area on the left end of the display that is
    incongruous with the rest of the display. It is only on the left end.

    http://imagebin.org/265633

    This image also shows the lighter central area of the display which is an
    artifact of just viewing it on-center (or nearly). This phenomenon can be
    ignored.

    Is the stripe due to LCD problem? Or...?

    Thanks.
     
    DaveC, Jul 26, 2013
    #1
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  2. DaveC

    Martin Brown Guest

    On 26/07/2013 07:27, DaveC wrote:
    > This is a ~ 4 year old HP Pavilion laptop with LCD display.
    >
    > There is a bright vertical area on the left end of the display that is
    > incongruous with the rest of the display. It is only on the left end.
    >
    > http://imagebin.org/265633
    >
    > This image also shows the lighter central area of the display which is an
    > artifact of just viewing it on-center (or nearly). This phenomenon can be
    > ignored.
    >
    > Is the stripe due to LCD problem? Or...?


    It is such a terrible photograph that it looks mostly like a reflection
    of something white you left on your desk off bottom right. It doesn't
    look abrupt enough to be an LCD connection defect which tends to give
    very sharp linear errors on bit/byte/word boundaries.

    Looks to me more like a physical fault with the backlighting optics. An
    impression heightened by a dark ridge to the RHS of the brighter patch.

    --
    Regards,
    Martin Brown
     
    Martin Brown, Jul 26, 2013
    #2
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  3. DaveC

    Baron Guest

    Martin Brown Inscribed thus:

    > On 26/07/2013 07:27, DaveC wrote:
    >> This is a ~ 4 year old HP Pavilion laptop with LCD display.
    >>
    >> There is a bright vertical area on the left end of the display that
    >> is incongruous with the rest of the display. It is only on the left
    >> end.
    >>
    >> http://imagebin.org/265633
    >>
    >> This image also shows the lighter central area of the display which
    >> is an artifact of just viewing it on-center (or nearly). This
    >> phenomenon can be ignored.
    >>
    >> Is the stripe due to LCD problem? Or...?

    >
    > It is such a terrible photograph that it looks mostly like a
    > reflection of something white you left on your desk off bottom right.
    > It doesn't look abrupt enough to be an LCD connection defect which
    > tends to give very sharp linear errors on bit/byte/word boundaries.
    >
    > Looks to me more like a physical fault with the backlighting optics.
    > An impression heightened by a dark ridge to the RHS of the brighter
    > patch.
    >


    I would agree ! Probably a defect in the backlight tube/tubes.

    --
    Best Regards:
    Baron.
     
    Baron, Jul 26, 2013
    #3
  4. DaveC

    DaveC Guest

    > I would agree ! Probably a defect in the backlight tube/tubes.

    I've seen dark bands before (burnt out tube) but never a bright band. I
    suppose all but one could be dimmed...

    Thanks,
    Dave
     
    DaveC, Jul 26, 2013
    #4
  5. DaveC

    Baron Guest

    DaveC Inscribed thus:

    >> I would agree ! Probably a defect in the backlight tube/tubes.

    >
    > I've seen dark bands before (burnt out tube) but never a bright band.
    > I suppose all but one could be dimmed...
    >
    > Thanks,
    > Dave


    The tubes blacken at one end more than the other, so the brightness gets
    turned up to compensate causing a bright area at one side. Double tube
    displays do the same but because one tube is at the top and the other
    at the bottom the bright area tends to be towards one corner.

    --
    Best Regards:
    Baron.
     
    Baron, Jul 26, 2013
    #5
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