Controlling light transmission with polarization and ellipticity adjustment
First Claim
1. A light transmission control system, comprising:
- a combination of a display and a first polarizer, said combination comprising linear polarizing means for linearly polarizing light, said first polarizer comprising an ellipticity increaser, said ellipticity increaser configured and oriented with respect to said linear polarizing means such that light of at least one visible wavelength passing from said linear polarizing means through said ellipticity increaser has a first ellipticity of higher than 0.5; and
a second polarizer spaced away from said first polarizer and comprising an ellipticity adjuster and a linear polarizer, said ellipticity adjuster oriented with respect to said linear polarizer such that light of said at least one visible wavelength passing from said linear polarizer through said ellipticity adjuster has a second ellipticity of higher than 0.5,said ellipticity increaser and said ellipticity adjuster disposed between said linear polarizing means and said linear polarizer,said ellipticity increaser and ellipticity adjuster configured and oriented with respect to each other such that light of said at least one visible wavelength passing from said linear polarizing means through said ellipticity increaser and said ellipticity adjuster to said linear polarizer has a polarization ellipse with a third ellipticity of less than 0.5, a major axis of said polarization ellipse being substantially perpendicular to a transmission axis of said linear polarizer.
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Accused Products
Abstract
Light transmission may be controlled using a system that includes a linear polarizing means and an ellipticity increaser associated with a display. The ellipticity increaser is configured and oriented with respect to the linear polarizing means for increasing the ellipticity of light passing from the linear polarizing means through the ellipticity increaser. The system also includes an ellipticity adjuster and a linear polarizer spaced away from the display. The ellipticity adjuster is oriented with respect to the linear polarizer for increasing the ellipticity of light passing from the linear polarizer through the ellipticity adjuster. The ellipticity increaser and adjuster are disposed between the linear polarizing means and the linear polarizer, and are configured and oriented with respect to each other for reducing ellipticity of light passing from the linear polarizing means through the ellipticity increaser and adjuster to the linear polarizer.
38 Citations
27 Claims
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1. A light transmission control system, comprising:
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a combination of a display and a first polarizer, said combination comprising linear polarizing means for linearly polarizing light, said first polarizer comprising an ellipticity increaser, said ellipticity increaser configured and oriented with respect to said linear polarizing means such that light of at least one visible wavelength passing from said linear polarizing means through said ellipticity increaser has a first ellipticity of higher than 0.5; and a second polarizer spaced away from said first polarizer and comprising an ellipticity adjuster and a linear polarizer, said ellipticity adjuster oriented with respect to said linear polarizer such that light of said at least one visible wavelength passing from said linear polarizer through said ellipticity adjuster has a second ellipticity of higher than 0.5, said ellipticity increaser and said ellipticity adjuster disposed between said linear polarizing means and said linear polarizer, said ellipticity increaser and ellipticity adjuster configured and oriented with respect to each other such that light of said at least one visible wavelength passing from said linear polarizing means through said ellipticity increaser and said ellipticity adjuster to said linear polarizer has a polarization ellipse with a third ellipticity of less than 0.5, a major axis of said polarization ellipse being substantially perpendicular to a transmission axis of said linear polarizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A light filter system for limiting visibility of a display, comprising:
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a first polarizer spaced away from said display and comprising a linear polarizer and a first wave retarder, said first wave retarder located between said linear polarizer and said display, said first polarizer configured and arranged for transmitting external light of at least one visible wavelength therethrough in a polarized state having a polarization ellipticity from 0.5 to 1; and a second polarizer covering said display and comprising a second wave retarder, said second polarizer configured and arranged for transmitting light of said at least one visible wavelength emitted from said display therethrough in a polarized state having a polarization ellipticity from 0.5 to 1; said first and second polarizers being configured and aligned such that transmission of visible light emitted from said display through both of said first and second polarizers is limited, thereby reducing visibility of said display through said first polarizer. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification