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Optical film, flexible display device, and method for producing optical film

A flexible display device and optical film technology, applied in the field of optical films, 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: 2020-01-10
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 method for producing optical film
  • Optical film, flexible display device, and method for producing optical film
  • Optical film, flexible display device, and method for producing 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 specified, "%" and "part" in an example mean mass % and a mass part. First, the measurement method of the physical property value will be described.

[0323]

[0324] Gel Permeation Chromatography (GPC) Determination

[0325] (1) Pretreatment method

[0326]Dissolve the sample in γ-butyrolactone (GBL) to make a 20% by mass solution, then dilute it to 100 times with N,N-dimethylacetamide (DMF) eluent, and perform the test with a 0.45 μm membrane filter The resulting 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 10mM lithium bromide)

[0330] Flow: 0.6mL / min

[0331] Detector: RI detector

[0332] Column temperature: 40°C

[0333] Injection volume: 20μL

[0334] Molecular weight standard: standard po...

manufacture example 1

[0414] Production example 1: Production of polyimide resin 1

[0415] Prepare a reactor in which a silicone tube, a stirring device, and a thermometer are installed in a separable flask, and an oil bath. 75.52 parts of 6FDA and 54.44 parts of TFMB were put into this flask. 519.84 parts of DMAc was added, stirring this at 400 rpm, and stirring was continued until the contents of the flask became a uniform solution. Next, stirring was continued for further 20 hours, adjusting the temperature in a container to the range of 20-30 degreeC using an oil bath, and it was made to react and generate|occur|produced 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 to adjust the polymer concentration to 10% by mass. Furthermore, 32.27 parts of pyridine and 41.65 parts of acetic anhydride were added, and it stirred at room te...

manufacture example 2

[0416] Production example 2: Production of polyimide resin 2

[0417] Except having changed the stirring time at 20-30 degreeC into 30 hours, it carried out similarly to the manufacture example 1, and manufactured the polyimide resin 2 whose weight average molecular weight was 430,000 and the imidization rate was 98.3%.

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Abstract

The present invention relates to an optical film which has excellent optical homogeneity and exhibits high optical properties after a durability test, a flexible display device, and a method for producing an optical film. The optical film of the present invention comprises a polyimide-based resin and / or a polyamide-based resin having a weight average molecular weight of 230,000 or more. Line contours in a direction h and a direction v orthogonal to each other in a film inverse space image obtained by performing Fourier transform on a projection image obtained by a projection method using an optical film are set as a line contour h and a line contour v. Line contours in a direction h' and a direction v' orthogonal to each other in a background inverse space image obtained by performing Fourier transform on a background image obtained without using an optical film in a projection method are set as a line contour h' and a line contour v'. The maximum strength of the line contour (h-h') isset as Ymh, the frequency at which Ymh is displayed is set as Xmh, the maximum intensity of the line contour (v-v') is set as Ymv, and the frequency at which Ymv is displayed is set as Xmv, both Ymhand Ymv are 30 or less, and the following relationships are satisfied: the light transmittance at 380 nm of the optical film is 20% or less, and the light transmittance at 420 nm is 75% or more. (Ymh+Ymv) / (Xmh+Xmv)1 / 2<30.

Description

technical field [0001] The present invention relates to an optical film, a flexible display device provided with the optical film, and a method for manufacturing the optical film. Background technique [0002] For optical films used in image display devices such as liquid crystal display devices and organic EL display devices, since the user directly observes the displayed image through the optical film, very high optical homogeneity is required. 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 the 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, 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 ...

Claims

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Application Information

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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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