Turning film having variable pitch
First Claim
1. A light-redirecting article having a width and a length, comprising:
- a light-redirecting surface comprising a plurality of light-redirecting structures elongated along the length of the light-redirecting article and arranged side-by-side, wherein each light-redirecting structure comprises;
(i) a first side surface oriented away from a normal to the light-redirecting article at a first angle;
(ii) a second side surface oriented away from a normal to the light-redirecting article at a second angle, wherein the cross-sectional shape of each light-redirecting structure has at least one convex surface;
wherein the first and second side surfaces meet at an apex; and
wherein, for at least two adjacent light redirecting structures, over the length of the adjacent light redirecting structures the widthwise pitch between apexes of the adjacent light-redirecting structures varies by more than +/−
3%.
3 Assignments
0 Petitions
Accused Products
Abstract
A light-redirecting article has a width and a length and has a light-redirecting surface with a plurality of light-redirecting structures elongated along the length of the light-redirecting article and arranged side-by-side. Each light-redirecting structure has a first side surface oriented away from a normal to the light-redirecting article at a first angle and a second side surface oriented away from a normal to the light-redirecting article at a second angle. The first and second side surfaces meet at an apex. The cross-sectional shape of each light-redirecting structure has at least one convex surface. For at least two adjacent light-redirecting structures, over the length of the at least two adjacent light-redirecting structures, the widthwise pitch between apexes of the adjacent light-redirecting structures varies by more than +/−3%.
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Citations
25 Claims
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1. A light-redirecting article having a width and a length, comprising:
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a light-redirecting surface comprising a plurality of light-redirecting structures elongated along the length of the light-redirecting article and arranged side-by-side, wherein each light-redirecting structure comprises;
(i) a first side surface oriented away from a normal to the light-redirecting article at a first angle;
(ii) a second side surface oriented away from a normal to the light-redirecting article at a second angle, wherein the cross-sectional shape of each light-redirecting structure has at least one convex surface;
wherein the first and second side surfaces meet at an apex; and
wherein, for at least two adjacent light redirecting structures, over the length of the adjacent light redirecting structures the widthwise pitch between apexes of the adjacent light-redirecting structures varies by more than +/−
3%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of manufacture of a light-redirecting article comprising:
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a) rotating a cylinder;
b) scribing the rotating cylinder with a tool to form adjacent scribe marks having a pitch that, over one full rotation of the cylinder, varies by more than +/−
3%; and
c) forming the light-redirecting article using the scribed cylinder in an injection roll molding process. - View Dependent Claims (13, 14)
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15. A display apparatus comprising
a) a light source; -
b) a light guiding plate for directing light from the light source outward from an output surface, over a range of angles;
c) a light-redirecting article for accepting the light from the light guiding plate, the light redirecting article having a width and a length, comprising;
a light-redirecting surface comprising a plurality of light-redirecting structures elongated along the length of the light-redirecting article and arranged side-by-side, wherein each light-redirecting structure comprises;
(i) a first side surface oriented away from a normal to the light-redirecting article at a first angle;
(ii) a second side surface oriented away from a normal to the light-redirecting article at a second angle, wherein the cross-sectional shape of each light-redirecting structure has at least one convex surface;
wherein the first and second side surfaces meet at an apex; and
wherein, for at least two adjacent light redirecting structures, over the length of the adjacent light redirecting structures the widthwise pitch between apexes of the adjacent light-redirecting structures varies by more than +/−
3%.the light-redirecting article providing illumination thereby; and
,d) a light gating device for modulating the incident illumination from the light-redirecting article. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification