Automotive head-up display with high brightness in daytime and high contrast in nighttime
First Claim
Patent Images
1. A head-up display for a vehicle, comprising:
- an image source for producing imaging illumination;
an optical combiner for partially reflecting the imaging illumination to produce a virtual image of said image source viewable by an operator of the vehicle, said virtual image having a primary virtual image as well as an unwanted ghost image; and
a movable polarizer that is selectively interposed between said image source and said combiner during dark ambient light conditions for polarizing the imaging illumination provided to said combiner, whereby the primary virtual image has greater brightness relative to that of the ghost image when said polarizer is providing polarized imaging illumination as compared to when said imaging illumination is not polarized by said polarizer.
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Abstract
A head-up display having an image source for producing imaging illumination, an optical combiner for partially reflecting the imaging illumination to produce a virtual image of the image source that is viewable by the operator of the vehicle, and a polarizer which can be controllably interposed between the image source and the optical combiner for nighttime use. The polarizer tends to block the illumination that otherwise would produce objectionable ghost images.
62 Citations
11 Claims
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1. A head-up display for a vehicle, comprising:
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an image source for producing imaging illumination; an optical combiner for partially reflecting the imaging illumination to produce a virtual image of said image source viewable by an operator of the vehicle, said virtual image having a primary virtual image as well as an unwanted ghost image; and a movable polarizer that is selectively interposed between said image source and said combiner during dark ambient light conditions for polarizing the imaging illumination provided to said combiner, whereby the primary virtual image has greater brightness relative to that of the ghost image when said polarizer is providing polarized imaging illumination as compared to when said imaging illumination is not polarized by said polarizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification