Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Optical compensating sheet, polarizing plate and liquid crystal display device

An optical compensation sheet and polarizing plate technology, which is applied in the field of optical compensation sheets, can solve the problems of reduced intensity, deterioration of optical properties, and incomplete research on existing technologies.

Active Publication Date: 2008-08-27
FUJIFILM CORP
View PDF120 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 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, and it is strongly desired to increase the strength of the support, but if the strength of the support is only increased, the problems of poor optical properties and reduced visibility will arise.
[0017] In addition, in a liquid crystal display device composed of a large display panel of 20 inches or more, it will be found that there are problems that have not been fully studied in the prior art.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0348] 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.

[0349] 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

[0727] (Manufacture of cellulose acylate film)

[0728]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.

[0729]

[0730] 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.

[0731] delayed ascension agent

[0732]

[0733] 474 parts by mass of the cellulose acylate solution and 25 parts by mass of the delayed ascension agent solution were mixed and fully stirred to prepare a coating solution. The added amount of the delayed rise agent was 3.5 parts by mass relative to 100 parts by mass of cellulose acetate.

[0734] The obtained coating solution is cast with a cylindrical casting machine. When the film surface temperature on the cylinder reaches 40°C, dry it with hot air at...

Embodiment 2

[0749] (Manufacture of cellulose acylate film)

[0750] 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.

[0751]

[0752] 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.

[0753] 484 parts by mass of the cellulose acylate solution and 15 parts by mass of the delayed rising agent solution were mixed and stirred sufficiently to prepare a coating liquid. The added amount of the delayed rising agent was 2.0 parts by mass relative to 100 parts by mass of cellulose acetate.

[0754] The obtained coating solution is cast with a cylinder casting machine. When the temperature of the film surface on the cylinder reaches 40°C, it is dried with hot air at 65°C for 1 minute, ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
water contact angleaaaaaaaaaa
thicknessaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides an optical compensative sheet for modifying display quality of a liquid crystal display device. An optical compensative sheet using a cellulose acylate, of which the in-plane retardation value (Re) is 0 nm ≤ Re < 20 nm, the thickness (d) is 10 &mgr;m < d < 85 &mgr;m, the average ((Vmin+Vmax) / 2) of minimum value (Vmin) and maximum value (Vmax) of the sonic velocity measured in plane of film is 2.2 km / sec < (Vmin+Vmax) / 2 < 2.5 km / sec, and the proportion (Vmin / Vmax) of minimum value of the sonic velocity measured in plane of film as compared to the maximum value is 1.01 < Vmin / Vmax / 2 < 1.02. An optical compensative sheet made by laminating an aligned membrane and an optically anisotropic layer in this order onto a transparent support comprising at least a micro particle having an average primary particle diameter of less than 80 nm and thickness of more than 20 &mgr;m but less than 80 &mgr;m, wherein the arithmetic average roughness (Ra) of surface unevenness related to a surface at the aligned membrane side of transparent support is more than 0.0002 &mgr;m but less than 0.1 &mgr;m measured according to JIS B0601-1994, the ten-points average roughness (Rz) is more than 0.0002 &mgr;m but less than 0.3&mgr;m, as well as the maximum height (Ry) is more than 0.002 &mgr;m but less than 0.5 &mgr;m, Re value of transparent support is more than 2 nm but less than 200 nm and the Rth value is more than 50 nm but less than 400nm. An optical compensative sheet using a cellulose acylate film comprising a cellulose acylate film having an acylation index of 59.0 to 61.5%, of which the surface is treated by soapnification and contact angle with water of the surface is more than 30 DEG but less than 70 DEG.

Description

technical field [0001] 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 [0002] 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 polarizing plate are sequentially arranged. [0003] As a general example, a liquid crystal cell is composed of rod-shaped liquid crysta...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/10G02B5/30G02F1/1335
CPCC08J5/18G02F1/133528G02F1/13363G02F1/133634
Inventor 伊藤洋士加藤荣一
Owner FUJIFILM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com