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Compensator with photochemical solidification barrier layer and its manufacturing method

An optical compensation and compensator technology, applied in the field of optical compensation sheets, can solve the problems of stress cracking of multi-layer LPP/LCP structure, poor adhesion between optical layer and barrier layer, etc.

Inactive Publication Date: 2004-05-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the layers are stacked, this will lead to poor adhesion between the optical layer and the barrier layer and stress cracking of the multilayer LPP / LCP structure

Method used

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  • Compensator with photochemical solidification barrier layer and its manufacturing method
  • Compensator with photochemical solidification barrier layer and its manufacturing method
  • Compensator with photochemical solidification barrier layer and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1 (retardation film R1 and compensator film C1)

[0072] (Photochemical curing barrier layer)

[0073] A barrier layer was prepared by coating the following composition coating solution containing SK 3200 on 80 μm thick triacetyl cellulose using a squeeze hopper. Dry the coating and then use an energy of 365mJ / cm 2 , UV radiation with a wavelength of 320-400nm cross-links it to form a dry weight of 1.7g / m 2 transparent barrier layer.

[0074] Propyl acetate 85%

[0075] SK3200 15%

[0076] (orientation layer 20)

[0077] On top of the cross-linked SK 3200 polymer layer a photo-alignment layer was coated from the following solution to a dry coat weight of 0.076 g / m 2 . After drying to remove the solvent, expose the sample to a wavelength of 308nm and an energy of 10-30mJ / cm 2 and linearly polarized UVB at an angle of 20°.

[0078] Staralign 2110 0.48%

[0079] Methyl ethyl ketone 31.52%

[0080] Cyclohexanone 22.75%

[0081] n-Propyl acetate 40.00% ...

Embodiment 2

[0089] Example 2 (Heat Cured Comparative Barrier Layer)

[0090] The coating solution of the following composition containing Cyme 1300 was coated on triacetyl cellulose with a thickness of 80 μm using an extrusion hopper to obtain a barrier layer. PTSA acts as an acid catalyst to crosslink the Cymel 300 coating. The coated layer was dried and crosslinked at 115°C to obtain a dry weight of 2.15 g / m 2 transparent barrier layer.

[0091] Methanol 63.36%

[0092] Butanol 15.84%

[0093] Cymel 300 20%

[0094] PTSA 0.8%

[0095] Optical layers 20, 30, 40 and 50 were coated on the Cymel barrier layer as described in Example 1 to form retardation film R2 and compensator film C2.

[0096] Comparative samples C2 and R2 were then evaluated for coating stress cracking and contrast in the same manner as in Example 1, and the results for all these samples are given in Table 1.

[0097] Example number

[0098] In Example 1 , no stress cracking was observed in C1 when the o...

Embodiment 3-7

[0100] A coating solution containing 0.71% gelatin and 0.35% nitrocellulose was primed on 80 μm thick triacetylcellulose.

[0101] Multiple compliant layers from the waterborne polyurethanes described in Table 2 were coated on the primed TAC obtained previously. These coatings were dried at 100°C to the dry weights described in Table 2. A SK 3200 UV curable layer was then applied over the compliant layer as described in the examples to give a dry weight of 1.7 g / m 2 transparent barrier layer.

[0102] Example 1

Compliant Layer Composition

Soft layer dry weight

70(g / m 2 )

Indentation of the barrier layer

Modulus*(GPa)

glue for compensator film

With stripping performance #

1 (the present invention)

none

0

1.7

0

2 (comparison)

none

0

2.1

-

3

NeoRez R600+3

Weight%CX100

1.076

0.7

+

4 ...

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PUM

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Abstract

Disclosed is an optical compensator for a liquid crystal display having improved optical properties, comprising a transparent polymeric support bearing an orientation layer and a photochemically cured optically anisotropic layer, in that order, wherein a photochemically cured barrier layer is present between the orientation layer and the support, and wherein the barrier layer, as disposed on the support, exhibits an indentation modulus of less than 2 GPa. The invention further provides a compensator comprising a transparent polymeric support, an orientation layer, and a photochemically cured optically anisotropic layer, in that order, wherein a photochemically cured barrier layer is present between the orientation layer and the support, and wherein there is present a compliant layer softer than the barrier layer adjacent to the support side of the barrier layer, and further comprises a compensator containing two or more compensator layers, with or without an adjacent compliant layer and a process for making the foregoing.

Description

technical field [0001] The invention relates to an optical compensation sheet for a liquid crystal display, which sequentially comprises a transparent support, an alignment layer and an optical anisotropy layer, wherein the photochemical curing blocking layer is located between the alignment layer and the support. Background technique [0002] A typical liquid crystal display comprises a liquid crystal cell or cell, a polarizer, and an optical compensator (phase retarder) between the liquid crystal cell and the polarizer. [0003] Liquid crystal displays (LCDs) are rapidly and widely used in many information display fields today, mainly due to improvements in display quality. Contrast, color rendition and stable gray spectrum intensity are important quality characteristics of electronic displays utilizing liquid crystal display technology. The main factor limiting the contrast of liquid crystal displays is the tendency of light to "bleed" through liquid crystal elements or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/13363G02F1/1337
CPCG02B5/3016G02F2413/105G02F1/133788G02F1/133632Y10T428/10C09K2323/00
Inventor M·奈尔T·K·琼斯B·M·霍塔林J·A·特雷斯特J·S·塞迪塔
Owner NITTO DENKO CORP