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Sun protection system for automotive vehicle

  • US 8,044,784 B2
  • Filed: 03/14/2011
  • Issued: 10/25/2011
  • Est. Priority Date: 03/14/2011
  • Status: Active Grant
First Claim
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1. A sun protection system for a transportation vehicle comprising:

  • a plurality of liquid crystal zones laminated in one or more glazings of the vehicle, wherein each liquid crystal zone attenuates light transmission in proportion to a respective drive signal applied across the respective liquid crystal zone;

    an occupant sensor for detecting an expanse of at least one occupant in the vehicle;

    a navigation system for determining a vehicle location, a date and time value, and a heading;

    an external temperature sensor for sensing an outside temperature;

    an internal temperature sensor for sensing an inside temperature; and

    a controller for generating the respective drive signals for the respective liquid crystal zones in a manual mode and in an automatic mode, wherein the is controller compares a temperature difference between the outside temperature and the inside temperature to a temperature threshold, and wherein the respective drive signals provide substantially zero attenuation if the temperature difference is less than the temperature threshold while in the automatic mode.

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