Optical filter comprising a variable transmittance layer
First Claim
Patent Images
1. An optical filter comprising:
- a. a variable transmittance layer having a first spectrum in a dark state, and a second spectrum in a faded state; and
b. a spectrally uniform color balancing layer having a third spectrum;
each of the first, second and third spectra comprising a visible portion;
the first and third spectra combining to provide a dark state spectrum approximating a dark state target color; and
the second and third spectra combining to provide a faded state spectrum approximating a faded state target colour.
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Abstract
An optical filter comprising a variable transmittance layer having a first spectrum in a dark state, and a second spectrum in a faded state; and a color balancing layer having a third spectrum; each of the first, second and third spectra comprising a visible portion; the first and third spectra combining to provide a dark state spectrum approximating a dark state target color, and the second and third spectra combining to provide a faded state spectrum approximating a faded state target color. The optical filter may further comprise a light attenuating layer. The optical filter may further comprise part of a laminated glass.
17 Citations
20 Claims
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1. An optical filter comprising:
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a. a variable transmittance layer having a first spectrum in a dark state, and a second spectrum in a faded state; and b. a spectrally uniform color balancing layer having a third spectrum; each of the first, second and third spectra comprising a visible portion; the first and third spectra combining to provide a dark state spectrum approximating a dark state target color; and the second and third spectra combining to provide a faded state spectrum approximating a faded state target colour. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of preparing an optical filter approximating a target color, comprising:
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a. providing a variable transmittance layer having a first spectrum in a dark state, and a second spectrum in a faded state; b. selecting a spectrally uniform color balancing layer having a third spectrum; and c. combining the variable transmittance layer and color balancing layer in a stack approximating the target color in the faded state, the dark state or both the faded state and the dark state.
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Specification