Optical compensating sheet, polarizing plate, and liquid crystal display device

A technology of optical compensation sheet and polarizing plate, which is applied in optics, nonlinear optics, polarizing elements, etc., and can solve problems such as deterioration of optical characteristics, reduction of strength, and reduction of visibility

Inactive Publication Date: 2008-06-18
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In order to respond to the demand for cost reduction due to weight reduction and improvement in productivity, thinning of the transparent support is also strongly desired, but the strength is reduced due to thinning, and it is practically used especially when used in a large liquid crystal display device. question on
Such a problem cannot be fully solved according to the current proposal,

Method used

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  • Optical compensating sheet, polarizing plate, and liquid crystal display device
  • Optical compensating sheet, polarizing plate, and liquid crystal display device
  • Optical compensating sheet, polarizing plate, and liquid crystal display device

Examples

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preparation example Construction

[0349] Next, a method for producing a thin film using a coating liquid in the present invention will be described. The preparation method and equipment of the polymer film can use the currently known solution casting film forming method and solution casting film forming device called the cylinder method or the conveyor belt method for the preparation of the polymer film.

[0350] The film forming process will be described. The coating solution (cellulose acylate solution) prepared in the dissolver (tank) is temporarily stored in the storage tank, and the final preparation is performed to defoam the coating solution containing air bubbles. It is important to remove aggregates and foreign matter by precise filtration of the prepared coating liquid. Specifically, it is preferable to use a filter having a pore size as small as possible within a range in which components in the coating liquid are not removed. Filtration uses a filter with an absolute filtration precision of 0.1 to...

Embodiment 1

[0735] (Manufacture of cellulose acylate film)

[0736] The following composition was put into the mixing tank, and it stirred, heating, and each component was dissolved, and the cellulose acylate solution was prepared.

[0737] Composition of cellulose acylate solution

Cellulose acetate with a degree of acetylation of 60.9%

Triphenyl Phosphate (Plasticizer)

Diphenyl diphenyl phosphate (plasticizer)

Dichloromethane (1st solvent)

Methanol (second solvent)

1-Butanol (the third solvent)

100 parts by mass

7.8 parts by mass

3.9 parts by mass

295 parts by mass

68 parts by mass

2 parts by mass

[0738] In another mixing tank, 16 parts by mass of the following delayed rising agent, 80 parts by mass of methylene chloride, and 20 parts by mass of methanol were charged and stirred while heating to prepare a delayed rising agent solution.

[0739] delayed ascension agent

[0740]

[0741] 474 part...

Embodiment 2

[0757] (Manufacture of cellulose acylate film)

[0758] The following composition was put into the mixing tank, and it stirred, heating, and each component was dissolved, and the cellulose acylate solution was prepared.

[0759] Composition of cellulose acylate solution

Cellulose acetate with a degree of acetylation of 60.7%

Polyether urethane (plasticizer)

100 parts by mass

16 parts by mass

(B-236, Sumitomo Bayer Ulettan Co., Ltd., Desmocol 176)

Dichloromethane (1st solvent)

Methanol (second solvent)

1-Butanol (the third solvent)

290 parts by mass

73 parts by mass

2 parts by mass

[0760] In another mixing tank, 16 parts by mass of the delayed rising agent used in Example 1, 80 parts by mass of methylene chloride, and 20 parts by mass of methanol were charged, stirred while heating, and a delayed rising agent solution was prepared.

[0761] 484 parts by mass of the cellulose acylate solutio...

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Abstract

The object of the present invention is to provide an optical compensation sheet for improving the display quality of a liquid crystal display device, a polarizing plate having the optical compensation sheet, and a liquid crystal display device. An optical compensation sheet is composed of cellulose acylate film, wherein the in-plane retardation value Re of the cellulose acylate film is: 0nm≤Re<20nm, the thickness d is: 10μm<d<85μm, and the sound velocity measured in the film plane The minimum value of V min and maximum V max The average value (V min +V max )/2 is: 2.2km/sec<(V min +V max )/2<2.5km/sec, and the ratio V of the maximum value and the minimum value of the sound velocity measured in the film surface max /V min For: 1.01<V max /V min <1.12. Another optical compensation sheet is composed of a cellulose acylate film and an optically anisotropic layer formed of a liquid crystal compound, wherein the above liquid crystal compound is provided on the above cellulose acylate film, wherein the in-plane of the cellulose acylate film The in-plane retardation value Re of cellulose acylate film is: 0nm≤Re<20nm, the thickness d is: 10μm<d<85μm, and the minimum value V of the sound velocity measured in the film plane min and maximum V max The average value (V min +V max )/2 is: 2.2km/sec<(V min +V max )/2<2.5km/sec, and the ratio V of the maximum value and the minimum value of the sound velocity measured in the film surface max /V min For: 1.01<V max /V min <1.12.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 200410061869.3 submitted on June 25, 2004. technical field [0002] The present invention relates to an optical compensation sheet for improving the viewing angle (also referred to as viewing angle) of a liquid crystal display device, a polarizing plate (also referred to as a polarizer) using the optical compensation sheet, and a liquid crystal display device. Background technique [0003] A liquid crystal display device usually consists of a liquid crystal cell, a polarizing plate, and an optical compensation film (retardation plate). In a transmissive liquid crystal display device, two polarizers are installed on both sides of the liquid crystal unit, and one or two optical compensation sheets are disposed between the liquid crystal unit and the polarizer. For a reflective liquid crystal display device, a reflective plate, a liquid crystal unit, an optical compensation sheet, and a polari...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02F1/13363G02F1/1335B29C41/12B29K1/00B29L7/00
Inventor 伊藤洋士加藤荣一
Owner FUJIFILM CORP
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