Intrinsic polarizer and method of manufacturing an intrinsic polarizer
First Claim
1. An intrinsic polarizer, comprising:
- a sheet of polyvinyl alcohol-type matrix including vinylene polymer blocks, the sheet defining a pass polarization axis and a block polarization axis perpendicular to the pass polarization axis, light having an electrical vector parallel to the pass polarization axis being substantially transmitted through the sheet and light having an electrical vector parallel to the block polarization axis being substantially absorbed by the vinylene polymer blocks, the sheet having an intrinsic absorption spectrum such that, when crossed with an identical sheet and illuminated with a cold cathode fluorescent tube (CCFT) light source, the sheet transmits light having an a* co-ordinate with a magnitude of less than 2 and a b* co-ordinate with a magnitude of less than 2, wherein the a* and b* co-ordinates are measured accordingly to the CIELAB color system,a concentration of vinylene polymer blocks having a chain length n less than or equal to 9 being greater than a concentration of vinylene polymer blocks having a chain length greater than 9.
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Accused Products
Abstract
An improved method of forming an intrinsic polarizer, referred to as a K-type polarizer, includes stretching a polymeric film a first stretching step. The polymeric film comprises a hydroxylated linear polymer which is converted after the first stretching step to form dichroic, copolymer polyvinylene blocks aligned in the polymeric film. The polymeric film is stretched in a second stretching step while converting the hydroxylated linear polymer. This method produces an improved K-type polarizer with excellent polarizing and color characteristics. For example, the dichroic ratio is higher than 100, the color shift for light passed through the polarizer in a crossed configuration is low, and the absorption of light in the blue region of the visible spectrum is more than one half of the absorption for light in the middle of the visible spectrum.
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Citations
13 Claims
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1. An intrinsic polarizer, comprising:
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a sheet of polyvinyl alcohol-type matrix including vinylene polymer blocks, the sheet defining a pass polarization axis and a block polarization axis perpendicular to the pass polarization axis, light having an electrical vector parallel to the pass polarization axis being substantially transmitted through the sheet and light having an electrical vector parallel to the block polarization axis being substantially absorbed by the vinylene polymer blocks, the sheet having an intrinsic absorption spectrum such that, when crossed with an identical sheet and illuminated with a cold cathode fluorescent tube (CCFT) light source, the sheet transmits light having an a* co-ordinate with a magnitude of less than 2 and a b* co-ordinate with a magnitude of less than 2, wherein the a* and b* co-ordinates are measured accordingly to the CIELAB color system, a concentration of vinylene polymer blocks having a chain length n less than or equal to 9 being greater than a concentration of vinylene polymer blocks having a chain length greater than 9. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification