Optical film, polarizing plate, and liquid crystal display device

An optical film, optical anisotropy technology, applied in optics, optical elements, polarizing elements, etc., can solve the problems of uncomfortable optical anisotropy layer use, poor manufacturing efficiency, difficult to control the phase freely, etc., and achieve good viewing angle compensation effect. , to prevent light leakage, the effect of high contrast ratio

Inactive Publication Date: 2008-08-27
JSR CORPORATIOON
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the base material used is glass, and it is difficult to freely control the phase difference, and the production efficiency is lower than that of a film that can be processed as a roll, so it is not suitable for use as an optically anisotropic layer for viewing angle compensation.

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 film, polarizing plate, and liquid crystal display device
  • Optical film, polarizing plate, and liquid crystal display device
  • Optical film, polarizing plate, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0321] Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not limited to the following Example unless the summary is exceeded. In addition, unless otherwise specified below, "part" and "%" mean "weight part" and "weight%".

[0322] The measurement methods of various measurement values ​​in the present invention are shown below.

[0323]

[0324] Using a differential scanning calorimeter (DSC) manufactured by Seiko Instruments, the measurement was performed in a nitrogen atmosphere at a temperature increase rate of 20° C. / min.

[0325]

[0326] According to ASTM D570, the sample was immersed in 23 degreeC water for 1 week, and the weight change before and after immersion was measured, and it calculated|required.

[0327]

[0328] The measurement was performed using a haze meter (HGM-2DP type) manufactured by SUGA TEST INSTRUMENTS.

[0329]

[0330] The measurement was performed using "KOBRA-21ADH" manufactur...

Synthetic example 1

[0340] 8-Methyl-8-methoxycarbonyltetracyclo[4.4.0.1 2，5 .1 7，10 250 parts of ]-3-dodecene (specific monomer), 18 parts of 1-hexene (molecular weight modifier) ​​and 750 parts of toluene (solvent for ring-opening polymerization reaction) were loaded into a reaction vessel replaced by nitrogen, and the The solution was heated to 60°C. Then, in the solution in the reaction vessel, add 0.62 parts of toluene solution of triethylaluminum (1.5 mol / l) as a polymerization catalyst, tungsten hexachloride modified with tert-butanol and methyl alcohol (tert-butanol: methanol: tungsten = 3.7 parts of toluene solution (0.35 mol: 0.3 mol: 1 mol) (concentration: 0.05 mol / l), this solution was heated and stirred at 80° C. for 3 hours to perform ring-opening polymerization reaction to obtain a ring-opened polymer solution. The polymerization conversion rate of this polymerization reaction was 97%. The logarithmic viscosity of the obtained ring-opened polymer measured in chloroform at 30°C wa...

Synthetic example 2

[0351] Using 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.1 2，5 .1 7，10 215 parts of ]-3-dodecene, 35 parts of bicyclo[2.2.1]hept-2-ene, and 18 parts of 1-hexene (molecular weight regulator), in the same manner as in Synthesis Example 1 except that A hydrogenated polymer (hereinafter referred to as "resin A2") was obtained.

[0352] The resulting resin A2:

[0353] The hydrogenation rate is 99.9%,

[0354] The glass transition temperature (Tg) measured by the DSC method is 125°C,

[0355] The polystyrene-equivalent Mn measured by the GPC method (column and solvent were the same as in Synthesis Example 1) was 46,000, Mw was 190,000, and the molecular weight distribution (Mw / Mn) was 4.15,

[0356] The saturated water absorption rate at 23°C is 0.18%,

[0357] SP value is 19(MPa 1 / 2 ),

[0358] The logarithmic viscosity in chloroform at 30°C is 0.69dl / g,

[0359] The gel content is 0.2%.

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
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
glass transition temperatureaaaaaaaaaa
Login to view more

Abstract

An optical film includes a film ''a'' formed by cyclic-olefin-based resin and an optically anisotropic layer ''b'' arranged on the film ''a'' and having homeotropic orientation The optical film preferably satisfies the following expressions [1] to [3]: [1] -600 nm <= Rth <= 200 nm, [2] 0 nm <= R <= 600 nm, and [3] NZ <= 1, wherein Rth represents a phase difference in the wavelength 550 nm in the thickness direction of the optical film, R represents a phase difference in the wavelength 550 nm in the optical film surface, and the relationship NZ = (nx - nz) / (nx - ny) is satisfied. When the optical film is used in a liquid crystal device in the ISP mode, it stably prevents light leak or coloring during black display and can obtain a high contrast ratio in all the directions, thereby exhibiting a preferable view angle compensation effect.

Description

technical field [0001] The invention relates to an optical film, a polarizer and a liquid crystal display device. More specifically, it relates to an optical film usable as a viewing angle compensation film of an in-plane switching (IPS) mode liquid crystal display device, a polarizing plate having the optical film, and a liquid crystal display device having the optical film or polarizing plate. Background technique [0002] Liquid crystal display devices are used in various products such as mobile phones, notebook computers, car navigation systems, and liquid crystal televisions due to their advantages of being extremely thin, compact, and low power consumption. Among them, liquid crystal televisions using transmissive liquid crystal displays are expected to have further demand in the future. Moreover, with the increase in size of displays, there is a higher demand than ever before for high-definition displays with high brightness and low cost at wide viewing angles. chang...

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 Applications(China)
IPC IPC(8): G02B5/30B32B7/02B32B27/00G02F1/1335G02F1/13363
CPCC09D5/00C09K2323/00C09K2323/031G02B5/3083G02F1/133634G02F2413/13G02F2413/14G02F1/133637Y10T428/26G02B5/30G02F1/13363G02F1/1337
Inventor 田中圭牛野卓浩关口正之
Owner JSR CORPORATIOON
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap