Laminate, liquid crystal panel, and liquid crystal display apparatus

A technology of laminates and liquid crystal panels, applied in static indicators, optics, instruments, etc., can solve the problems of reduced contrast, display unevenness, and increased display color changes, and achieve the effect of reducing thickness changes.

Inactive Publication Date: 2008-07-02
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A conventional liquid crystal display device equipped with a liquid crystal cell of the IPS mode has a problem in that when viewed from an oblique direction at an angle of 45° (an azimuth angle of 45°, 135°, 225°, or 315°) with respect to the absorption axis of the polarizing plate When the screen is viewed, contrast decreases; and display color shifting (also known as color shift) increases depending on the angle at which the screen is viewed
[0004] However, when a birefringent layer satisfying the relationship of nz>nx=ny is formed by a forming method including a coating method, a change in the thickness of the birefringent layer occurs due to a change in the coating thickness of the coating layer, and therefore, the occurrence The problem is that display roughness occurs in a black display when viewed in an oblique direction

Method used

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  • Laminate, liquid crystal panel, and liquid crystal display apparatus
  • Laminate, liquid crystal panel, and liquid crystal display apparatus
  • Laminate, liquid crystal panel, and liquid crystal display apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] 1. Preparation of Coating Solution

[0143] The following were mixed in the mixing ratios described in Table 1 to prepare a liquid crystal composition: a liquid crystal polymer represented by the following formula (3) (weight-average molecular weight: 5,000); a commercially available liquid crystal compound ("PaliocolorLC242" (commercial name), produced by BASF), which has a phenylbenzoate group as a mesogenic ligand and has two polymerizable functional groups in the molecular structure; a photopolymerization initiator ("IRGACURE127" (trade name) produced by produced by Ciba Specialty Chemicals Inc.); and a leveling agent (acrylate polymer (block oligomer of butyl acrylate·ethyl acrylate in a molar ratio of 50:50, weight average molecular weight: 16,000)). The obtained liquid crystal composition was mixed with cyclopentanone under shaking at 40° C. for 30 minutes to dissolve the cyclopentanone therein, thereby obtaining a coating solution.

[0144]

[0145] 2. Prepa...

reference example 1

[0162] Using an intermittent corona treatment device ("CORONA GENERATOR CT-0212" (trade name), manufactured by KASUGA DENKI Co. Ltd), the birefringent layer side of the laminate obtained in Example 1, that is, the side facing the base The side opposite to the material side, at 116W / m 2 · Minutes of corona treatment. The contact angle of the treated birefringent layer to pure water was 46°, so it was confirmed that the treated birefringent layer had satisfactory wettability. Similarly, when the side opposite to the substrate side facing the birefringent layer of the laminate obtained in Comparative Example 2 was subjected to corona treatment, the contact angle of the birefringent layer with respect to pure water was 57°. It is believed that the reason for the satisfactory wettability of the laminate obtained in Example 1 is that the non-siloxane-based position of the acrylate polymer (for example, the butyl group of butyl acrylate) in the birefringent layer A coating film of ...

Embodiment 2

[0164] By attaching a polarizing plate (“SIG1423” (trade name), manufactured by Nitto Denko Corporation) to the substrate side of the laminate obtained in Example 1 via an acrylic pressure-sensitive adhesive (thickness: 20 μm), obtained Laminates with polarizers. At this time, the polarizing plate was attached to the laminate such that the absorption axis of the polarizer of the polarizing plate and the slow axis of the base material as a positive A plate were perpendicular to each other. Then, the polarizing plate placed on the backlight side of the liquid crystal cell included in a liquid crystal television ("W37L-H9000" (trade name), manufactured by Hitachi Ltd.) was removed. The above laminate with a polarizer was attached to a liquid crystal cell via an acrylic pressure-sensitive adhesive (thickness: 20 μm) in place of the removed polarizing plate so that the birefringent layer was opposed to the liquid crystal cell, thereby preparing a liquid crystal display device. At ...

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Abstract

A laminate according to one embodiment of the present invention includes: a substrate; and a birefringent layer formed on the substrate and satisfying the relationship of nz>nx=ny, wherein the birefringent layer Contains acrylate polymers.

Description

[0001] This application claims priority under 35 U.S.C. Section 119 to Japanese Patent Application No. 2006-347713 filed December 25, 2006, which is incorporated herein by reference. technical field [0002] The present invention relates to a laminate having a thin birefringent layer with very little variation in thickness, a liquid crystal panel and a liquid crystal display device using the laminate. Background technique [0003] Typical examples of driving modes in a liquid crystal display device provided with a liquid crystal layer (liquid crystal cell) including an in-plane switching (IPS) mode, a fringe field switching (FFS) mode and a ferroelectric liquid crystal (FLC) mode Liquid crystal molecules aligned uniformly in the absence of an electric field. For example, a liquid crystal display device configured with an in-plane switching (IPS) mode liquid crystal cell involves rotating the liquid crystal molecules by about 45° by applying an electric field to the side of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/04G02F1/13363G02F1/133
CPCC09K2323/031G02B5/3083G02F1/133634G02B5/02G02F1/1335
Inventor 武本博之朝永政俊
Owner NITTO DENKO CORP
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