OPTICAL SUBSTRATE AND METHOD OF MAKING
First Claim
1. An optical substrate, comprising:
- a surface characterized by a correlation function value of less than about 37 percent of an initial value within a correlation length of about 1 cm or less, wherein the surface is defined by a first surface structure function modulated by a second surface structure function, the surface of the optical substrate producing specular and diffuse light from a first input beam of light, the first surface structure function defining a plurality of prism structures having a length, width and peak angle with optical characteristics to produce at least one output specular component from an input beam of light, and the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function in at least a phase.
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Abstract
An optical surface substrate. The optical substrate features a three-dimensional surface. The optical substrate is defined by a first surface structure function modulated by a second surface structure function, the first surface structure function producing at least one specular component from a first input beam of light. The second surface structure function has a geometry with at least pseudo-random characteristics to modulate the first surface structure function such that the surface of the optical substrate produces specular and diffuse light from the first input beam of light. The optical substrate is suitable for use in a variety of applications, including brightness enhancement and projection devices.
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Citations
40 Claims
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1. An optical substrate, comprising:
a surface characterized by a correlation function value of less than about 37 percent of an initial value within a correlation length of about 1 cm or less, wherein the surface is defined by a first surface structure function modulated by a second surface structure function, the surface of the optical substrate producing specular and diffuse light from a first input beam of light, the first surface structure function defining a plurality of prism structures having a length, width and peak angle with optical characteristics to produce at least one output specular component from an input beam of light, and the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function in at least a phase. - View Dependent Claims (2, 3, 4)
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5. A brightness enhancement film, comprising:
a surface characterized by a correlation length of about 1 cm or less, the surface having a shape to turn and diffuse incident light to produce at least a 30 percent brightness increase on-axis to a viewer, wherein the surface produces diffused components of light with a power half angle between about 0.1 and 60 degrees, the surface defined by a first surface structure function and a second surface structure function, the first surface structure function defining a plurality of prism structures having a length, width and peak angle with optical characteristics to produce at least one output specular component from an input beam of light, and the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function in at least a phase. - View Dependent Claims (6, 7, 8)
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9. An optical substrate, comprising:
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a three-dimensional surface defined by a first surface structure function and a second surface structure function, the first surface structure function having a geometry with optical characteristics to produce at least one output specular component from an input beam of light;
the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function;
wherein the three-dimensional surface has a correlation function value of less than about 37 percent of an initial correlation function value in a correlation length of about 1 cm or less, the first surface structure function defining a plurality of prism structures having a length, width and peak angle with optical characteristics to produce at least one output specular component from an input beam of light, and the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function in at least a phase. - View Dependent Claims (10, 11, 12)
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13. A brightness enhancement film, comprising:
a surface characterized by a correlation length of about 1 cm or less, the surface having a shape to turn and diffuse incident light to produce a 50 percent to 200 percent brightness increase on-axis to a viewer, wherein the surface produces diffused components of light with a power half angle between about 0.1 and 60 degrees, the surface defined by a first surface structure function and a second surface structure function, the first surface structure function defining a plurality of prism structures having a length, width and peak angle with optical characteristics to produce at least one output specular component from an input beam of light, and the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function in at least a phase. - View Dependent Claims (14, 15)
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16. A backlight display device comprising:
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an optical source for generating light;
a light guide for guiding the light therealong including a reflective surface for reflecting the light out of the light guide; and
at least one optical substrate receptive of the light from the reflective surface, the optical substrate comprising;
a three-dimensional surface defined by two surface structure functions, the first surface structure function defining a plurality of prism structures having a length, width and peak angle with optical characteristics to produce at least one output specular component from an input beam of light;
the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function in at least a phase;
wherein the three-dimensional surface has a correlation function value of less than about 37 percent of an initial correlation function value in a correlation length of about 1 cm or less. - View Dependent Claims (17, 18)
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19. An optical substrate, comprising:
a surface defined by a first surface structure function modulated by a second surface structure function, the surface of the optical substrate producing specular and diffuse light from a first input beam of light, the first surface structure function defining at least one prism structure with optical characteristics to produce at least one output specular component from an input beam of light, and the second surface structure function comprising a sinusoidal function and random function to modulate the first surface structure function in at least a phase, the random function being spatially constant, spatially varying, or a combination of spatially constant and spatially varying.
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20. An optical substrate, comprising:
a surface defined by a first surface structure function modulated by a second surface structure function, the first surface structure function defining at least one prism structure, and the second surface structure function comprising a sinusoidal function and random function to modulate the first surface structure function in at least a phase, the random function being spatially constant, spatially varying, or a combination of spatially constant and spatially varying.
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21. An optical substrate comprising:
an optical surface comprising a plurality of sinusoidally modulated prism structures characterized by a plurality of parameters, wherein at least one of the parameters is randomized for at least one of the prism structures. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. An optical substrate, comprising:
a surface defined by a first surface structure function modulated by a second surface structure function, the first surface structure function defining a plurality of prism structures extending along a length and having a height, the second surface structure function having a geometry with at least pseudo-random characteristics to modulate the first surface structure function in the height along the length, and wherein the second surface structure function comprises a sinusoidal carrier waveform modulated by a random function. - View Dependent Claims (34, 35, 36)
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37. An optical substrate, comprising:
a surface defined by a first surface structure function modulated by a second surface structure function, the first surface structure function defining at least one prism structure, and the second surface structure function comprising a random function to modulate the first surface structure function along a length of the prism structure such that a lateral position of a peak of the prism structure and a height of the prism structure are randomly modulated. - View Dependent Claims (38)
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39. An optical substrate comprising:
a plurality of prism structures modulated by a plurality of sinusoidal functions, wherein at least one of the sinusoidal functions has a randomized parameter for at least one of the prism structures.
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40. An optical substrate comprising:
a plurality of prism structures modulated by a plurality of functions, wherein at least one of the functions has a randomized parameter for at least one of the prism structures.
Specification