Laminate and display apparatus using the same
A laminate is provided that can easily attain safety standards, such as impact resistance, while cost reduction is aimed for, for example, when the laminate is provided on a display viewing surface. A display apparatus using the laminate is also provided. By using a filter for a display having a specified parameter, for example, containing a transparent adhesive layer or a transparent resin layer having a specified Young's modulus and a specified thickness, impact resistance is enhanced. By using the filter for a display containing an impact absorption layer having a specified penetration and a specified thickness, impact resistance is enhanced.
1. A display filter provided on a display viewing surface, comprising:
a laminate comprising at least a transparent adhesive layer and a transparent resin layer and having a thickness of 3.5 mm or less, wherein the laminate satisfies the following relationship when tested by a ball drop impact test:
T/F ≧200(μs/kN)
in which T (μs) represents a period of time from a generation of impact stress to an appearance of a first peak, and F (kN) represents impact stress at the time of the first peak in a stress-time curve, for the ball drop impact test in which a steel ball having a weight in a range of from 530 g to 550 g is dropped on the laminate from a height of 10 cm;
wherein the transparent adhesive layer comprises at least one selected from the group consisting of a rubber adhesive, an acrylic adhesive, a silicone adhesive and a vinyl adhesive, and the transparent adhesive layer has a Young's modulus and a thickness of from 1×10 2 Pa to 1×10 6 Pa and from 10 μm to 500 μm, respectively; and
wherein the transparent resin layer comprises at least one selected from the group consisting of a polyester resin, a polypropylene resin, an ethylene vinyl acetate copolymer, polyethylene, polystyrene, polyurethane and a transparent elastomer, and the transparent resin layer has a thickness of from 10 μm to 3,000 μm.
2. The display filter of claim 1 , wherein at least one of the transparent resin layers has a Young's modulus of from 1×10 3 Pa to 1×10 8 Pa.
3. The display filter of claim 1 , comprising two or more transparent resin layers, of which two layers are in a relation that a ratio of JIS-A hardness between the two layers is 1.1 or more.
4. The display filter of claim 1 , wherein the transparent resin layer has a JIS-A hardness of 55 to 98.
5. The display filter of claim 1 , further comprising at least one impact absorption layer.
6. The display filter of claim 5 , wherein at least one of the impact absorption layers has a penetration of from about 50 to 200 based on the JIS K 2207-1991-50 g load test.
7. The display filter of claim 5 , further comprising at least two layers in total of the transparent resin layers and impact absorption layers, of which two layers are in a relation that a ratio of JIS-A hardness between the two layers is 1.1 or more.
8. The display filter of claim 5 , wherein the impact absorption layer has a JIS-A hardness of 98 or less.
9. The display filter of claim 1 , wherein the transparent resin layer comprises a transparent electrically conductive layer or a metallic mesh layer having a surface resistance of from 0.01 Ω/square to 30 Ω/square.
10. The display filter of claim 1 , wherein the transparent resin layer has at least one function selected from the group consisting of an anti-reflection function, an anti-glare function, an anti-fouling function, an antistatic function, a polarizing function and a phase difference function.
11. The display filter of claim 1 , wherein the transparent resin layer has a filtering function of filtering at least one region selected from the group consisting of the whole region, near-infrared region and visible light region of electromagnetic waves.
12. The display filter of claim 1 , further comprising a dye having an absorption maximum in a wavelength range of 570 nm to 605 nm.
13. A display apparatus comprising the display filter of claim 1 .