Light control film and backlight unit using the same
First Claim
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1. A light control film having a rough surface, wherein, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface, by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
- nv of the rough surface with respect to a base plane of the film is not less than 27 degrees and not more than 70 degrees at substantially any position on the light control film.
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Accused Products
Abstract
A light control film providing improved n front luminance and appropriate light diffusion, without problems of interference pattern, glare etc., has a rough surface constituted so that, for a curved surface portion of the rough surface, having an approximately square area of 1 mm2 or larger and defined at an arbitrary position on the rough surface by using data for heights of the rough surface measured at predetermined intervals in the longitudinal and transverse directions, an average of slopes of the curved surface portion (θnv degrees) of the rough surface, with respect to a base plane of the film, should be not less than 27 degrees and not more than 70 degrees at substantially any position on the light control film.
10 Citations
16 Claims
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1. A light control film having a rough surface, wherein, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface, by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
- nv of the rough surface with respect to a base plane of the film is not less than 27 degrees and not more than 70 degrees at substantially any position on the light control film.
- View Dependent Claims (13, 14, 15, 16)
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2. A light control film having a rough surface formed by a patterned layer comprising a material having a refractive index n, wherein, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface, by using height data of the rough surface measured in predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
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nv of the rough surface with respect to a base plane of the film is not less than 59−
20n degrees and not more than 70 degrees at any position on the light control film.
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nv of the rough surface with respect to a base plane of the film is not less than 59−
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3. A light control film having a rough surface, wherein, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface, by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
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nv of the rough surface with respect to a base plane of the film and a ratio Ar=A2/A1 of an area A1 of the approximately square region and a surface area A2 of the approximated curved surface of the rough surface satisfy the following equation 1 or 2 at substantially any position on the light control film
θ
nv÷
Ar≧
22
(1)
30≦
θ
nv×
Ar≦
140
(2).
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nv of the rough surface with respect to a base plane of the film and a ratio Ar=A2/A1 of an area A1 of the approximately square region and a surface area A2 of the approximated curved surface of the rough surface satisfy the following equation 1 or 2 at substantially any position on the light control film
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4. A light control film having a rough surface formed by a patterned layer comprising a material having a refractive index n, wherein, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
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nv of the rough surface with respect to a base plane of the film and a ratio A2/A1 of an area A1 of the approximately square region and a surface area A2 of the approximated curved surface of the rough surface satisfy the following equation 3 or 4 at substantially any position on the light control film
θ
nv÷
Ar×
n2≧
35
(3)
60≦
θ
nv×
Ar×
n2≦
350
(4).
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nv of the rough surface with respect to a base plane of the film and a ratio A2/A1 of an area A1 of the approximately square region and a surface area A2 of the approximated curved surface of the rough surface satisfy the following equation 3 or 4 at substantially any position on the light control film
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5. A light control film having a rough surface, wherein a condition that, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
- nv of the rough surface with respect to a base plane of the film is not less than 27 degrees and not more than 70 degrees, and an absolute value of a numerical value Ask calculated in accordance with the equation 5 by using all the height data of the rough surface is not more than 1.2 is satisfied at substantially any position on the light control film
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6. A light control film having a rough surface formed by a patterned layer comprising a material having a refractive index n, wherein a condition that, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
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nv of the rough surface with respect to a base plane of the film is not less than 59−
20n degrees and not more than 70 degrees, and an absolute value of a numerical value Ask calculated in accordance with the equation 5 by using all the height data of the rough surface is not more than 1.2 is satisfied at substantially any position on the light control film
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nv of the rough surface with respect to a base plane of the film is not less than 59−
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7. A light control film having a rough surface, wherein a condition that, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface (θ
- nv (degree)) of the rough surface with respect to a base plane of the film is not less than 27 degrees and not more than 70 degrees, and a numerical value (Aku) calculated in accordance with the equation (6) by using all the height data of the rough surface is not less than 1.5 and not more than 5.0 is satisfied at substantially any position on the light control film.
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8. A light control film having a rough surface formed by a patterned layer comprising a material having a refractive index n, wherein a condition that, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, an average of slopes of the curved surface θ
-
nv of the rough surface with respect to a base plane of the film is not less than 59−
20n degrees and not more than 70 degrees, and a numerical value Aku calculated in accordance with the equation 6 by using all the height data of the rough surface is not less than 1.5 and not more than 5.0 is satisfied at substantially any position on the light control film
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nv of the rough surface with respect to a base plane of the film is not less than 59−
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9. A light control film having a rough surface, wherein a condition that, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, a ratio Ar=A2/A1 of an area A1 of the approximately square region and a surface area A2 of the approximated curved surface of the rough surface is not less than 1.2 and not more than 2.5, and absolute value of a numerical value Ask calculated in accordance with the equation (5) by using all the height data of the rough surface is not more than 1.2 is satisfied a substantially any position on the light control film
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10. A light control film having a rough surface formed by a patterned layer comprising a material having a refractive index n, wherein a condition that, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, a ratio Ar=A2/A1 of an area A1 of the approximately square region and a surface area A2 of the approximated curved surface of the rough surface is not less than 2−
- 0.5n and not more than 2.5, and absolute value of a numerical value Ask calculated in accordance with the equation (5) by using all the height data of the rough surface is not more than 1.2 is satisfied at substantially any position on the light control film
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11. A light control film having a rough surface, wherein a condition that, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger defined at an arbitrary position on the rough surface by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, a ratio Ar=A2/A1 of an area A1 of the approximately square region and a surface area A2 of the approximated curved surface of the rough surface is not less than 1.2 and not more than 2.5, and a numerical value Aku calculated in accordance with the equation 6 by using all the surface height data is not less than 1.5 and not more than 5.0 is satisfied at substantially any position on the light control film
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12. A light control film having a rough surface formed by a patterned layer comprising a material having a refractive index n, wherein, for a curved surface of the rough surface in an approximately square region having an area of 1 mm2 or larger, defined at an arbitrary position on the rough surface, by using height data of the rough surface measured at predetermined intervals in the longitudinal and transverse directions in the approximately square region, a ratio of an area of the approximately square region (A1) and a surface area of the approximated curved surface of the rough surface (A2) (Ar=A2/A1) is not less than (2 −
- 0.5n) and not more than 2.5, and a numerical value Aku calculated in accordance with the equation (6) by using all the surface height data is not less than 1.5 and not more than 5.0 at substantially any position on the light control film
Specification
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Current AssigneeKimoto Company Limited
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Original AssigneeKimoto Company Limited
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InventorsEtori, Hideki
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Primary Examiner(s)Husar; Stephen F.
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Assistant Examiner(s)Neils; Peggy A.
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Application NumberUS10/591,396Publication NumberTime in Patent Office2,239 DaysField of Search362/606, 362/618, 362/331, 359/559US Class Current362/606CPC Class CodesG02B 5/02 Diffusing elements; Afocal ...G02F 1/133606 including a specially adapt...
