BIREFRINGENT STRUCTURED FILM FOR LED COLOR MIXING IN A BACKLIGHT
First Claim
1. An article for use in light spreading, comprising:
- (a) a body having (i) first and second surfaces, and (ii) first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axes in a thickness direction of the body; and
(b) a portion of the first surface being a birefringent structured surface,wherein the portion is structured such that, when the article receives light signals from a plurality of point light sources each emitting light within a particular range of wavelengths, the structured surface causes splitting of the light signals into a plurality of divergent light signals producing a substantially uniform color light signal.
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Accused Products
Abstract
An article for use in light spreading includes a body having first and second surfaces, and first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axes in a thickness direction of the body. A portion of the first surface is a birefringent structured surface. The portion is structured such that, when the article receives a light signal within a particular range of wavelengths, the structured surface causes splitting the light signal into a plurality of divergent light signals. The article can be used for color mixing such as in a cavity providing a backlight for LCD devices or other display devices requiring a backlight.
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Citations
21 Claims
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1. An article for use in light spreading, comprising:
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(a) a body having (i) first and second surfaces, and (ii) first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axes in a thickness direction of the body; and (b) a portion of the first surface being a birefringent structured surface, wherein the portion is structured such that, when the article receives light signals from a plurality of point light sources each emitting light within a particular range of wavelengths, the structured surface causes splitting of the light signals into a plurality of divergent light signals producing a substantially uniform color light signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of making an article for use in light spreading, comprising the steps of:
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(a) providing a body having (i) first and second surfaces, and (ii) first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axes in a thickness direction of the body; and (b) forming a birefringent structured surface on a portion of the first surface, wherein the portion is structured such that, when the article receives light signals from a plurality of point light sources each emitting light within a particular range of wavelengths, the structured surface causes splitting of the light signals into a plurality of divergent light signals producing a substantially uniform color light signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An article for use in light spreading, comprising:
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(a) a body having (i) first and second surfaces, and (ii) first and second in-plane axes that are orthogonal with respect to each other and a third axis that is mutually orthogonal to the first and second in-plane axes in a thickness direction of the body; and (b) a portion of the first surface being a birefringent structured surface, wherein the portion is structured such that, when the article receives a plurality of light signals each within a distinct range of wavelengths, the structured surface causes splitting the light signal into a plurality of divergent light signals among the wavelengths. - View Dependent Claims (20, 21)
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Specification