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Color head-up display system

  • US 5,200,844 A
  • Filed: 05/22/1992
  • Issued: 04/06/1993
  • Est. Priority Date: 05/22/1992
  • Status: Expired due to Fees
First Claim
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1. A field sequential color head-up display system, comprising:

  • image generating means having a source of light of at least two different wavelengths;

    light polarizing means in optical communication with said source, including a color selective polarizing filter having first and second substantially orthogonally oriented absorption axes, the first absorption axis passing linearly polarized light of a first color and the second absorption axis passing linearly polarized light of a second color;

    circular polarizing means in optical communication with said light polarizing means for selectively transmitting light of a color determined by the amount by which the light emitted by said source is optically retarded;

    variable optical retarding means disposed between said color selective polarizing filter and said circular polarizing means for retarding light applied to said circular polarizing means;

    control means coupled to said variable optical retarding means for controlling the amount of optical retardation imposed by said retarding means upon light transmitted therethrough, whereby said retarding means are capable of at least first and second retardations resulting in the emission of light of at least first and second colors;

    image collimating means in optical communication with said circular polarizing means for applying an image generated by said image generating means to an image combining means positioned in the line of sight between an observer and a scene to provide a superposition of a generated image over the scene visible to the observer; and

    optical wavelength enhancement means in optical communication with said image collimating means and said image combining means for enhancement of the reflectivity on said image combining means of the wavelengths of light generated by said light sourcewhereby generated images appear to the observer as if they were located at infinity so that scenes visible to the observer through the image combining means appear to include the generate images.

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