Light control film and backlight unit using the same
First Claim
Patent Images
1. A light control film having a rough surface,wherein the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, an average θ
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ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surface, not less than 20 degrees and not more than 75 degrees, andwherein substantially all profile curves have an absolute value of skewness, according to JIS B0601;
2001, of not more than 1.2.
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Accused Products
Abstract
The light control film provides improved front luminance and appropriate diffusion without the problems of interference pattern, glare. The light control film has a rough surface that, for substantially any arbitrary cross section perpendicular to a base plane of the film, has an average θave of absolute values of slope, with respect to the base plane of a curve along the edge of the cross section, which is not less than 20 degrees and not more than 75 degrees, and has an absolute value of skewness (JIS B0601:2001) of the profile curve of not more than 1.2.
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Citations
18 Claims
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1. A light control film having a rough surface,
wherein the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, an average θ -
ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surface, not less than 20 degrees and not more than 75 degrees, and
wherein substantially all profile curves have an absolute value of skewness, according to JIS B0601;
2001, of not more than 1.2. - View Dependent Claims (9, 10, 11)
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ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surface, not less than 20 degrees and not more than 75 degrees, and
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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 the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, an average θ -
ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surface, not less than 36−
10n degrees and not more than 86−
10n degrees, andwherein substantially all profile curves have an absolute value of skewness, according to JIS B0601;
2001, of not more than n−
0.4. - View Dependent Claims (12)
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ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surface, not less than 36−
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3. A light control film having a rough surface,
wherein the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, an average θ -
ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surface, not less than 20 degrees and not more than 75 degrees, and
wherein substantially all profile curves have a kurtosis, according to JIS B0601;
2001, of not less than 1.5 and not more than 5.0. - View Dependent Claims (13)
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ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surface, not less than 20 degrees and not more than 75 degrees, and
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4. A light control film having a rough surface formed by a patterned layer comprising a material having a predetermined refractive index of n,
wherein the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, an average θ -
ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surfaces, not less than 36−
10n degrees and not more than 86−
10n degrees, andwherein substantially all profile curves have a kurtosis, according to JIS B0601;
2001, of not less than 1.5 and not more than 10n−
11. - View Dependent Claims (14)
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ave of absolute values of slope, with respect to the base plane of a profile curve along the edge of the cross section contoured by the rough surfaces, not less than 36−
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5. A light control film having a rough surface,
wherein the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, a ratio (Lr=L2/L1, wherein L2 is length of a profile curve along the edge of the cross section contoured by the rough surface and L1 is length of a straight line defined as an intersection of the base plane and the cross section, and wherein the ratio is 1.1≦ - Lr≦
1.8, andwherein substantially all profile curves have an absolute value of skewness, according to JIS B0601;
2001, of not more than 1.2. - View Dependent Claims (15)
- Lr≦
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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 the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, a ratio L2/L1, wherein L2 is length of a profile curve along the edge of the cross section contoured by the rough surface and L1 is length of a straight line defined as an intersection of the base plane and the cross section, and wherein the ratio is 1.9− - 0.5n≦
Lr≦
1.8, andwherein substantially all profile curves have an absolute value of skewness, according to JIS B0601;
2001, not more than n−
0.4. - View Dependent Claims (16)
- 0.5n≦
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7. A light control film having a rough surface,
wherein the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, a ratio (Lr=L2/L1, wherein L2 is length of a profile curve along the edge of the cross section contoured by the rough surface and L1 is length of a straight line defined as an intersection of the base plane and the cross section, and wherein the ratio is 1.1≦ - Lr≦
1.8, andwherein substantially all profile curves have a kurtosis, according to JIS B0601;
2001 of not less than 1.0 and not more than 4.5. - View Dependent Claims (17)
- Lr≦
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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 the rough surface has, for an arbitrary cross section perpendicular to a base plane of the film, a ratio Lr=L2/L1, wherein L2 is length of a profile curve along the edge of the cross section contoured by the rough surface and L1 is length of a straight line defined as an intersection of the base plane and the cross section, and wherein the ratio is 1.9− - 0.5n≦
Lr≦
1.8, andwherein substantially all profile curves have a kurtosis, according to JIS B0601;
2001, of less than 1.0 and not more than 10n−
11.5. - View Dependent Claims (18)
- 0.5n≦
Specification