White film and backlight using same
First Claim
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1. A white film comprising polymer film having a thickness of 188 to 250 μ
- m, containing air bubbles and having a thermal shrinkage rate in longitudinal directions of the film that are not less than 0.08% and not more than 0.15% at 90°
C., in transverse directions of the film that are not less than −
0.05% and not more than 0.01% at 90°
C., wherein the white film has reflectance properties.
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Abstract
A white film including polymer film wherein both the thermal shrinkage rate in the longitudinal direction and that in the transverse direction of the film are not less than −0.2% and not more than 0.5% at 90° C., and a backlight for liquid crystal displays using such a white film. Since the white film hardly suffers from undulation or rise in its end portions, it is most suitable as a reflection film for backlights of liquid crystal displays. Since a backlight for liquid crystal displays using this white film can be used for a long time, it is applicable to liquid crystal displays of various electrical/electronic devices.
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Citations
14 Claims
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1. A white film comprising polymer film having a thickness of 188 to 250 μ
- m, containing air bubbles and having a thermal shrinkage rate in longitudinal directions of the film that are not less than 0.08% and not more than 0.15% at 90°
C., in transverse directions of the film that are not less than −
0.05% and not more than 0.01% at 90°
C., wherein the white film has reflectance properties. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- m, containing air bubbles and having a thermal shrinkage rate in longitudinal directions of the film that are not less than 0.08% and not more than 0.15% at 90°
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14. A white film comprising polymer film having a thickness of 188 to 250 μ
- m, containing air bubbles and having a thermal shrinkage rate in longitudinal directions of the film that are not less than 0.08% and not more than 0.15% at 90°
C., in transverse directions of the film that are not less than −
0.05% and not more than 0.01% at 90°
C., wherein mean reflectance of the white film in a wavelength range of 400 nm to 700 nm is not less than 85%.
- m, containing air bubbles and having a thermal shrinkage rate in longitudinal directions of the film that are not less than 0.08% and not more than 0.15% at 90°
Specification