Polarizing plate with phase-difference layer and image display device
There is provided a polarizing plate with a retardation layer being extremely thin and having excellent durability. A polarizing plate with a retardation layer includes a polarizer; a protective layer bonded onto one side of the polarizer through intermediation of a first adhesive layer; and a retardation layer bonded onto another side of the polarizer through intermediation of a second adhesive layer. The polarizer has a thickness of from 2 μm to 12 μm, a boric acid content of 18 wt % or more, an iodine content of 2.1 wt % or more, a single layer transmittance of 44.2% or more, a polarization degree of 98% or more, and an orientation function of 0.35 or more. The retardation layer has a thickness of 50 μm or less and a birefringence Δnxy of 0.0025 or more. The first and second adhesive layer each has a thickness of 2 μm or less.
1. A polarizing plate with a retardation layer, comprising:
a polarizer;
a protective layer bonded onto one side of the polarizer through intermediation of a first adhesive layer; and
a retardation layer bonded onto another side of the polarizer through intermediation of a second adhesive layer,
wherein the polarizer has a thickness of from 2 μm to 12 μm, a boric acid content of 18 wt % or more, an iodine content of 2.1 wt % or more, a single layer transmittance of 44.2% or more, a polarization degree of 98% or more, and an orientation function of 0.35 or more,
wherein the retardation layer has a thickness of 50 μm or less and a birefringence Δn xy of 0.0025 or more, and
wherein the first adhesive layer and the second adhesive layer each have a thickness of 2 μm or less.
2. The polarizing plate with a retardation layer according to claim 1 , wherein the retardation layer comprises a resin film selected from a cyclic olefin-based resin film and a polycarbonate-based resin film.
3. The polarizing plate with a retardation layer according to claim 1 , wherein the retardation layer is configured to function as a λ/4 plate.
4. The polarizing plate with a retardation layer according to claim 1 , wherein the polarizer is obtained by forming a polyvinyl alcohol-based resin layer on one side of a resin substrate, and stretching and dyeing a laminate of the resin substrate and the polyvinyl alcohol-based resin layer to turn the polyvinyl alcohol-based resin layer into a polarizer.
5. The polarizing plate with a retardation layer according to claim 1 , wherein the polarizing plate with a retardation layer has a total thickness of 150 μm or less.
6. The polarizing plate with a retardation layer according to claim 1 , wherein the first adhesive layer and the second adhesive layer each have an indentation elastic modulus of 1.0×10 7 Pa or more.
7. An image display apparatus, comprising the polarizing plate with a retardation layer of claim 1 .