Polar S720i rainbow screens?

Discussion in 'Cycling Equipment' started by kneighbour, Apr 30, 2003.

  1. Weisse Luft

    Weisse Luft New Member

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    Its completely normal. It only happens in twilight conditions because the light emitted by the sky is slightly polarized, leading to interference patterns much like that of a soap bubble.

    LCD's work by cross-polarization to block light reflection through the liquid crystal display. When current is applied to the desired pixel, the liquid crystals are oriented orthogonally to the polarization axis. This blocks the light transmittance. In the S700 series, the backlight reflects off the oriented liquid crystal, illuminating the pixel preferentially.

    The interference pattern is a "manufacturing defect" arising from birefrengence (sp?) from the multiple laminations required to make such a display. The "defect" is on the order of a wavelength of visible light, 300-600 nanometers. There is no way to hold the tolerances of the laminations as thermal expansion will cause it to shift.

    I admit, its a PITA but it also means I am either starting too early or need to get home.

    The cheap and dirty fix is to get an auxillary light to keep it artifically illuminated. There are a few made for this purpose.
     


  2. hstan

    hstan New Member

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  3. jonsimon

    jonsimon New Member

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    I get it only when I where polarized sunglasses.
     
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