التفاصيل البيبلوغرافية
| العنوان: |
LIQUID CRYSTAL DISPLAY PANEL AND LIQUID CRYSTAL DISPLAY |
| Document Number: |
20090231519 |
| تاريخ النشر: |
September 17, 2009 |
| Appl. No: |
12/090765 |
| Application Filed: |
September 14, 2006 |
| مستخلص: |
A liquid crystal display panel includes a liquid crystal cell, a first polarizing plate placed on one side of the liquid crystal cell, a second polarizing plate placed on the other side of the liquid crystal cell, a retardation film placed between the liquid crystal cell and the first polarizing plate, and a pressure-sensitive adhesive layer placed between the liquid crystal cell and the retardation film, wherein the first and second polarizing plates have absorption axes whose directions are substantially orthogonal to each other, the retardation film is a norbornene resin-containing stretched film and has a refractive index ellipsoid satisfying the relation nx≧nz>ny, and the pressure-sensitive adhesive layer includes a pressure-sensitive adhesive that may be produced by crosslinking a composition including a (meth)acrylate (co)polymer and a crosslinking agent including a peroxide as a main component. When the liquid crystal display panel is viewed from oblique directions, leakage of light and changes in color are small, and when the liquid crystal cell is recycled, the laminated film has a high level of easy peelability. |
| Inventors: |
Toyama, Yuusuke (Osaka, JP); Satake, Masayuki (Osaka, JP); Yoda, Kenji (Osaka, JP); Kobayashi, Kentarou (Osaka, JP); Yano, Shuuji (Osaka, JP) |
| Assignees: |
NITTO DENKO CORPORATION (Ibaraki-shi, Osaka, JP) |
| Claim: |
1. A liquid crystal display panel, comprising: a liquid crystal cell; a first polarizing plate placed on one side of the liquid crystal cell; a second polarizing plate placed on another side of the liquid crystal cell; a retardation film placed between the liquid crystal cell and the first polarizing plate; and a pressure-sensitive adhesive layer placed between the liquid crystal cell and the retardation film, wherein the first and second polarizing plates having absorption axes whose directions are substantially orthogonal to each other; the retardation film being a norbornene resin-containing stretched film and having a refractive index ellipsoid satisfying the relation nx≧nz>ny, wherein nx is a refractive index in a slow axis direction, ny is a refractive index in a fast axis direction, and nz is a refractive index in a thickness direction; and the pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive that may be produced by crosslinking a composition comprising a (meth)acrylate (co)polymer and a crosslinking agent comprising a peroxide as a main component. |
| Claim: |
2. The liquid crystal display panel according to claim 1, wherein the liquid crystal cell comprises a liquid crystal layer containing a liquid crystal molecule that is oriented to have a homogeneous molecular alignment with no electric field applied thereto. |
| Claim: |
3. The liquid crystal display panel according to claim 1, wherein the liquid crystal cell has an initial alignment direction that is substantially parallel to the direction of the absorption axis of the second polarizer. |
| Claim: |
4. The liquid crystal display panel according to claim 1, wherein the liquid crystal cell has a driving mode selected from an in-plane switching (IPS) mode, a fringe field switching (FFS) mode and a ferroelectric liquid crystal (FLC) mode. |
| Claim: |
5. The liquid crystal display panel according to claim 1, wherein the first polarizing plate comprises a polarizer, a first protective layer placed on a liquid crystal cell side of the polarizer, and a second protective layer placed on another side of the polarizer opposite to the liquid crystal cell side. |
| Claim: |
6. The liquid crystal display panel according to claim 1, wherein the retardation film has an absolute value of photoelastic coefficient of 1×10−12 to 10×10−12 that is measured at 23° C. and a light wavelength of 590 nm. |
| Claim: |
7. The liquid crystal display panel according to claim 1, wherein the retardation film has a slow axis whose direction is substantially parallel or substantially orthogonal to the direction of the absorption axis of the first polarizing plate. |
| Claim: |
8. The liquid crystal display panel according to claim 1, wherein the retardation film has an in-plane retardation (Re[590]) of 80 nm to 350 nm that is measured at 23° C. and a light wavelength of 590 nm. |
| Claim: |
9. The liquid crystal display panel according to claim 1, wherein the retardation film has a wave dispersion (D) of 0.90 to 1.10, wherein the wave dispersion (D) is calculated from the formula: Re[480]/Re[590], wherein Re[480] is an in-plane retardation measured at 23° C. and a light wavelength of 480 nm, and Re[590] is an in-plane retardation measured at 23° C. and a light wavelength of 590 nm. |
| Claim: |
10. The liquid crystal display panel according to claim 1, wherein the retardation film has an Nz coefficient of 0.1 to 0.7, wherein the Nz coefficient is calculated from the formula: Rth[590]/Re[590], wherein Re[590] is an in-plane retardation measured at 23° C. and a light wavelength of 590 nm, and Rth[590] is a retardation in a thickness direction that is measured at 23° C. and a light wavelength of 590 nm. |
| Claim: |
11. The liquid crystal display panel according to claim 1, wherein the pressure-sensitive adhesive layer has an adhesive force (FA) of 2 N/25 mm to 10 N/25 mm at 23° C. to a glass plate, wherein the adhesive force is measured by a process that comprises pressing a laminate of the pressure-sensitive adhesive layer and the retardation film each with a width of 25 mm against a glass plate by one reciprocation of a 2 kg roller to bond the laminate to the glass plate, aging the laminate at 23° C. for one hour, and then measuring an adhesive strength when the laminate is peeled in a 90-degree direction at a rate of 300 mm/minute, wherein the adhesive strength is determined as the adhesive force. |
| Claim: |
12. The liquid crystal display panel according to claim 1, wherein the pressure-sensitive adhesive layer has an anchoring force (FB) of 10 N/25 mm to 40 N/25 mm at 23° C. to the retardation film, wherein the anchoring force is measured by a process that comprises pressing a laminate of the pressure-sensitive adhesive layer and the retardation film each with a width of 25 mm against a surface of an indium tin oxide vapor-deposited onto a polyethylene terephthalate film by one reciprocation of a 2 kg roller to bond the laminate to the polyethylene terephthalate film, aging the laminate at 23° C. for one hour, and then measuring an adhesive strength when the polyethylene terephthalate film is peeled together with the pressure-sensitive adhesive layer in a 180-degree direction at a rate of 300 mm/minute, wherein the adhesive strength is determined as the anchoring force. |
| Claim: |
13. The liquid crystal display panel according to claim 1, wherein there is a difference (FB−FA) of at least 5 N/25 mm between the anchoring force (FB) of the pressure-sensitive adhesive layer at 23° C. to the retardation film and the adhesive force (FA) of the pressure-sensitive adhesive layer at 23° C. to a glass plate, wherein the anchoring force is measured by a process that comprises pressing a laminate of the pressure-sensitive adhesive layer and the retardation film each with a width of 25 mm against a surface of an indium tin oxide vapor-deposited onto a polyethylene terephthalate film by one reciprocation of a 2 kg roller to bond the laminate to the polyethylene terephthalate film, aging the laminate at 23° C. for one hour, and then measuring an adhesive strength when the polyethylene terephthalate film is peeled together with the pressure-sensitive adhesive layer in a 180-degree direction at a rate of 300 mm/minute, wherein the adhesive strength is determined as the anchoring force, and the adhesive force is measured by a process that comprises pressing a laminate of the pressure-sensitive adhesive layer and the retardation film each with a width of 25 mm against a glass plate by one reciprocation of a 2 kg roller to bond the laminate to the glass plate, aging the laminate at 23° C. for one hour, and then measuring an adhesive strength when the laminate is peeled in a 90-degree direction at a rate of 300 mm/minute, wherein the adhesive strength is determined as the adhesive force. |
| Claim: |
14. The liquid crystal display panel according to claim 1, wherein the (meth)acrylate (co)polymer is a copolymer of a (meth)acrylate monomer having a straight or branched alkyl group of 1 to 8 carbon atoms and another (meth)acrylate monomer having a straight or branched alkyl group of 1 to 8 carbon atoms in which at least one hydrogen atom is replaced with a hydroxyl group. |
| Claim: |
15. The liquid crystal display panel according to claim 1, wherein the crosslinking agent comprising the peroxide as a main component has a content of 0.01 to 1.0 part by weight, base on 100 parts by weight of the (meth)acrylate (co)polymer. |
| Claim: |
16. The liquid crystal display panel according to claim 1, wherein the pressure-sensitive adhesive has a glass transition temperature (Tg) of −70° C. to −10° C. |
| Claim: |
17. The liquid crystal display panel according to claim 1, wherein the pressure-sensitive adhesive has a moisture content of 1.0% or less. |
| Claim: |
18. A liquid crystal display, comprising the liquid crystal display panel according to claim 1. |
| Claim: |
19. The liquid crystal display according to claim 18, wherein it has a maximum Y value of 0.5 or less at a polar angle of 60° along all azimuth angles (0° to 360°), when a black image is displayed. |
| Claim: |
20. The liquid crystal display according to claim 17, wherein it has a maximum Δa*b* value of 8.0 or less at a polar angle of 60° along all azimuth angles (0° to 360°), when a black image is displayed. |
| Current U.S. Class: |
349/96 |
| Current International Class: |
02; 02 |
| رقم الانضمام: |
edspap.20090231519 |
| قاعدة البيانات: |
USPTO Patent Applications |