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Optical film, flexible display device, and manufacturing method of optical film

A flexible display device and optical film technology, applied in the field of optical film, can solve the problems of damaged optical homogeneity, image distortion, uneven thickness, etc., and achieve the effect of excellent optical homogeneity and high optical characteristics

Active Publication Date: 2022-07-12
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a production method involving coating and drying, thickness unevenness and orientation unevenness may occur depending on coating conditions and drying conditions.
Even if the film has unevenness at such a level that it cannot be recognized visually, when it is finally assembled as an optical film in an image display device, the optical homogeneity may be impaired due to the unevenness, and it may be seen image distortion etc.

Method used

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  • Optical film, flexible display device, and manufacturing method of optical film
  • Optical film, flexible display device, and manufacturing method of optical film
  • Optical film, flexible display device, and manufacturing method of optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0322] Hereinafter, the present invention will be described in more detail by way of examples. Unless otherwise indicated, "%" and "part" in an example mean mass % and mass part. First, the measurement method of a physical property value is demonstrated.

[0323]

[0324] Gel permeation chromatography (GPC) assay

[0325] (1) Pretreatment method

[0326]The sample was dissolved in γ-butyrolactone (GBL) to prepare a 20% by mass solution, then diluted 100-fold with N,N-dimethylacetamide (DMF) eluent, and subjected to a 0.45 μm membrane filter. The obtained solution was filtered and used as a measurement solution.

[0327] (2) Measurement conditions

[0328] Column: TSKgel SuperAWM-H×2+SuperAW2500×1 (6.0mm I.D.×150mm×3 pieces)

[0329] Eluent: DMF (added with 10 mM lithium bromide)

[0330] Flow: 0.6mL / min

[0331] Detector: RI detector

[0332] Column temperature: 40℃

[0333] Injection volume: 20μL

[0334] Molecular weight standard: standard polystyrene

[0335] ...

manufacture example 1

[0414] Production Example 1: Production of Polyimide Resin 1

[0415] Prepare a reactor including a silicone tube, a stirring device and a thermometer, and an oil bath in a separable flask. 75.52 parts of 6FDA and 54.44 parts of TFMB were put into this flask. While stirring this at 400 rpm, 19.84 parts of DMAc was added, and stirring was continued until the content of the flask became a uniform solution. Next, stirring was continued for further 20 hours while adjusting the temperature in the container to the range of 20 to 30°C using an oil bath, and the reaction was carried out to generate a polyamic acid. After 30 minutes, the stirring speed was changed to 100 rpm. After stirring for 20 hours, the temperature of the reaction system was returned to room temperature, and 649.8 parts of DMAc was added and adjusted so that the polymer concentration was 10% by mass. Further, 32.27 parts of pyridine and 41.65 parts of acetic anhydride were added, and the mixture was stirred at ...

manufacture example 2

[0416] Production Example 2: Production of Polyimide Resin 2

[0417] Except having changed the stirring time at 20-30 degreeC to 30 hours, it carried out similarly to manufacture example 1, and manufactured the polyimide resin 2 which has a weight average molecular weight of 430,000, and an imidation rate of 98.3%.

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PUM

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Abstract

Provided are an optical film, a flexible display device, and a manufacturing method of the optical film which are excellent in optical homogeneity and exhibit high optical properties after a durability test. The optical film contains a polyimide-based resin and / or a polyamide-based resin with a weight average molecular weight of 230,000 or more, and the inverse space image of the film obtained by Fourier transforming the projected image obtained by the projection method using the optical film The line contours of the orthogonal direction h and direction v are set as the line contour h and the line contour v, and the background inverse space image obtained by Fourier transformation of the background image obtained by the projection method without using the optical film is positive to each other. The line contours in the intersecting direction h' and v' are denoted as the line contour h' and the line contour v', and the maximum strength of the line contour (h‑h') is denoted by Y mh , will display Y mh The frequency is set to X mh , set the maximum intensity of the line profile (v‑v’) to Y mv , will display Y mv The frequency is set to X mv time, Y mh and Y mv All are 30 or less, and satisfy the following relationship, the optical film has a light transmittance of 20% or less at 380 nm, and a light transmittance of 75% or more at 420 nm. (Y mh +Y mv ) / (X mh +X mv ) 1 / 2 <30.

Description

technical field [0001] The present invention relates to an optical film, a flexible display device including the optical film, and a method for producing the optical film. Background technique [0002] Very high optical homogeneity is required for optical films used in image display devices such as liquid crystal display devices and organic EL display devices, since the user directly visually observes the displayed image through the optical film. sex. [0003] As a method for producing such an optical film, a method is used in which a solution containing a volatile solvent and a resin constituting an optical film is applied to a substrate, dried, and then peeled off (for example, Patent Document 1). In such a production method involving coating and drying, unevenness in thickness and unevenness in orientation may occur depending on coating conditions and drying conditions. Even when the film has unevenness of such a level that cannot be visually recognized, when it is fina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/04G09F9/30G06F3/041
CPCG02B1/04G09F9/301G06F3/0412G02B5/20
Inventor 大松一喜片宝蓝
Owner SUMITOMO CHEM CO LTD
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