Optical multilayer film, and optical component and display device comprising same

A technology of optical multilayer film and optical components, applied in optical elements, optics, nonlinear optics, etc., can solve problems such as low durability and reduced degree of polarization

Active Publication Date: 2020-02-07
爱思开迈克沃有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cellulose triacetate film is vulnerable to heat and humidity, so when it is used for a long time in a high-temperature and high-humidity environment, the degree of polarization decreases, and there is a possibility that excessive light exposure at the edge occurs due to moisture degradation. Problems with low durability such as light leakage

Method used

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  • Optical multilayer film, and optical component and display device comprising same
  • Optical multilayer film, and optical component and display device comprising same
  • Optical multilayer film, and optical component and display device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0216] Embodiment 1: the making of optical multilayer film

[0217] Step (1) formation of substrate layer

[0218] Extrude polyethylene terephthalate resin (SKC company) through an extruder at about 280°C, and cast it through casting rolls at about 30°C to make unstretched sheets (sheet ). After preheating the unstretched sheet under the temperature conditions in Table 1 below, stretching was performed in the machine direction (MD) and tenter direction (TD) at a temperature of 125° C. according to the stretching ratios shown in Table 1. Thereafter, the stretched board was thermally cured for about 30 seconds at the temperature in Table 1 below to form a substrate layer.

[0219] Step (2) formation of undercoat

[0220] In the process of forming the base material layer, an undercoat layer is formed on the base material layer after stretching in the machine direction (MD) and before stretching in the tenter direction (TD). In this case, the base layer is formed by applying a...

experiment example 1

[0231] Experimental example 1: Measurement of reflectivity

[0232] The reflectance of the optical multilayer film produced in Example 1 above was measured.

[0233] After attaching a black tape on glass with little light absorption and attaching an optical multilayer film sample thereon, the reflectance was measured in a wavelength range of 400 nm to 800 nm using a spectrophotometer (U-4100, Hitachi).

[0234] Additionally, the same procedure as in Example 1 above was repeated, and the thickness of any layer was changed as shown below to produce individual optical multilayer films.

[0235] Specifically, after producing various optical multilayer films under the conditions of (a) to (d) below and measuring each reflectance, they are shown in Figure 3a to Figure 3d .

[0236] (a) changing the thickness of the undercoat layer from 45nm to 105nm;

[0237] (b) changing the thickness of the hard coat layer from 0.5 μm to 3.5 μm;

[0238] (c) changing the thickness of the firs...

experiment example 2

[0241] Experimental example 2: Evaluation of base material layer

[0242] Repeat the step (1) of the above-mentioned embodiment 1, and the specific production process conditions are as follows to prepare the polyester base material layer.

[0243] Table 2

[0244]

[0245] The following experiments were carried out on the above six substrate layer samples.

[0246] (1) Refractive index and in-plane retardation

[0247] Refractive index ((nx+ny) / 2), in-plane retardation (Ro), thickness direction retardation (Rth), and in-plane retardation within effective width (|ΔRo| / |Δx|) were measured for the samples.

[0248] First, the orientation axis direction of the sample is obtained using two polarizing plates, and the sample is cut out into a rectangle of 4 cm×2 cm so that the orientation axis directions are perpendicular to each other. In-plane retardation (Ro) and thickness direction retardation (Rth) were measured at the width center using a retardation measuring device (man...

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Abstract

Provided is an optical multiplayer film, including a sequential laminate of a polyester base layer, a primer layer, a hard coating layer, a first refractive layer, and a second refractive layer. The optical multilayer film can improve optical characteristics by adjusting an in-plane retardation of the base layer, a refractive index of each layer or the like while realizing a very low reflectance.Accordingly, the optical component and the display device including the optical multilayer film have low reflectance and also have excellent optical characteristics.

Description

technical field [0001] The present example relates to an optical multilayer film having ultra-low reflection properties, an optical component including the same, and a display device. Background technique [0002] Recently, as demand for liquid crystal displays (LCDs) has increased dramatically, attention has also been increasing on polarizing plates, which may be called essential components of the above-mentioned liquid crystal display devices. The polarizer plays the role of changing natural light that vibrates and enters in multiple directions into light that vibrates in only one direction, and is an essential component that provides predetermined transmitted light and changes the color tone of the transmitted light. [0003] A polarizing plate has a structure in which a protective film is laminated on one or both sides of a polarizer. In this case, a polyvinyl alcohol (PVA) film is mainly used for the polarizer. Also, as the protective film, triacetyl cellulose (TAC) is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/14G02B1/11G02F1/1335
CPCG02B5/305G02B1/14G02B1/11G02F1/133528G02B5/3083G02B5/3033G02F1/133502H10K50/8445H10K50/858H10K50/86G02B5/3041C08J7/042C08J5/18C09D175/04C09D133/08G02B1/111C09K2323/035H10K85/151H10K2102/351
Inventor 许荣民李世喆李承爰
Owner 爱思开迈克沃有限公司
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