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Transparent conductive optical sheet with excellent pattern invisibility

A transparent conductive, optical sheet technology, applied in the direction of optics, optical components, conductors, etc., to achieve the effect of high operability, high stability and reliability, and excellent surface hardness

Active Publication Date: 2018-03-27
爱思开迈克沃解决方案有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing transparent conductive optical sheets still have room for improvement in terms of optical / electrical / mechanical properties

Method used

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  • Transparent conductive optical sheet with excellent pattern invisibility
  • Transparent conductive optical sheet with excellent pattern invisibility
  • Transparent conductive optical sheet with excellent pattern invisibility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0115] Example: Fabrication of transparent conductive optical sheets with index matching layers (sheets 1 to 12)

[0116] Step 1: Prepare the transparent base layer

[0117] A transparent PET material with a refractive index (n) of 1.634 to 1.663 at a wavelength of 550 nm and a thickness of 125 μm is used.

[0118] Step 2: Forming the first index matching layer

[0119] Mix 5.5 parts by weight of thermosetting acrylic resin (A811, Aekyung Chemical Co.), 0.3 part by weight of polyisocyanate curing agent (DN980S, Aekyung Chemical Co.), 47.1 parts by weight of xylene (xylene) for dilution ) and 47.1 parts by weight of butyl acetate, 50 to 80 parts by weight of zirconium dioxide (ZrO 2 , JGC Corporation) standard further added zirconium dioxide. The obtained mixed solution is coated on the transparent base layer, dried and thermally cured to form a first refractive index matching layer with a refractive index of 1.573-1.657 and a thickness of 70-85 nm at a wavelength of 550 nm....

experiment example 1

[0132] Experimental example 1: Evaluation of △R value

[0133] For the transparent conductive optical sheet, the reflectance of each wavelength in the visible light region (380 to 780 nm) was measured using a measuring instrument (U4100, Mitsubishi Corporation). At this time, in order to eliminate interference caused by internal reflection, the outer surface of the transparent substrate was printed in black and then measured. Using the measured values, the ΔR value was obtained from the aforementioned Mathematical Formula 1.

experiment example 2

[0134] Experimental example 2: Evaluation of △ER value

[0135] For the transparent conductive optical sheet, the reflected color expressed as the color coordinate of a 2° field of view with respect to a D65 light source was measured using a measuring instrument (U4100, Mitsubishi Corporation). At this time, in order to eliminate the interference caused by internal reflection, the outer surface of the PET material was printed in black and then measured. The value of ΔER was obtained using the measured values ​​and according to the aforementioned Mathematical Formula 2.

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Abstract

The present invention relates to a transparent conductive optical sheet including an ITO layer on which a pattern or the like is formed by etching. A difference between reflectivity of a non-etched portion and reflectivity of an etched portion of the ITO layer, and a difference between a reflected color of the non-etched portion and a reflected color of the etched portion of the ITO layer are corrected by a thin film interference effect of refractive index combination layers arranged on the transparent conductive optical sheet. Therefore, a user cannot visually distinguish the non-etched portion from the etched portion, and the image quality of a lower display panel can be prevented from being deteriorated. In addition, the transparent conductive optical sheet has excellent crystallinity of the ITO layer when treated with heat, has a slow dimensional change rate, and thus is highly reliable. The transparent conductive optical sheet has excellent hardness of the surface and thus has appropriate handling properties. Accordingly, the transparent conductive optical sheet can be advantageously used for a field of touch screen panels applied to display panels of various electronic devices.

Description

technical field [0001] The present invention relates to a transparent conductive optical sheet including indium tin oxide (ITO), and more particularly to a transparent conductive optical sheet including an ITO layer etched to form a pattern or the like used on a touch screen panel or the like. Background technique [0002] Recently, touch screen panels (touch screen panels, TSPs) are widely used in displays of mobile phones, tablet devices, monitors, and the like. As a key material of such a TSP, an optical sheet containing ITO as a transparent conductive material is mainly used. [0003] When the optical sheet containing ITO is used in a touch screen panel, the ITO layer is generally partially etched to form a sensing pattern. However, since ITO has an inherent dispersion characteristic that the refractive index increases as it moves from the visible light wavelength region (380 to 730nm) to the shorter wavelength direction, especially when the light reflected by the ITO l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/045
CPCB32B9/00B32B2307/418B32B7/023B32B7/025G02B5/00H01B5/00
Inventor 遇硕锺朴俊纪片升勇李庚男金京民
Owner 爱思开迈克沃解决方案有限公司
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