KR-102962901-B1 - OPTICAL LAMINATE, transparent display COMPRISING THE SAME, AND MANUFACTURING METHOD FOR THE SAME

KR102962901B1KR 102962901 B1KR102962901 B1KR 102962901B1KR-102962901-B1

Abstract

The present invention relates to an optical laminate and a method for manufacturing the same, comprising: a glass substrate; an adhesive layer formed on one surface of the glass substrate; a metal layer pattern formed on one surface of the adhesive layer; and a functional layer provided in a portion on one surface of the adhesive layer where the metal layer pattern is not formed, wherein the adhesive layer comprises a silicone-based adhesive and the functional layer comprises a solder resist layer.

Inventors

노성진
강구현
윤상원
이준구
박기준
이철훈

Assignees

동우 화인켐 주식회사

Dates

Publication Date: 20260512
Application Date: 20240216
Priority Date: 20230330

Claims (14)

Optical laminate; and A transparent display including a light-emitting diode (LED), The above optical laminate is, Glass substrate; An adhesive layer formed on one surface of the above glass substrate; A metal layer pattern formed on one surface of the adhesive layer; and It includes a functional layer provided in a portion on one surface of the adhesive layer where a metal layer pattern is not formed, and The above adhesive layer comprises a silicone-based adhesive, and The above functional layer includes a solder resist layer, and A light-emitting diode (LED) is included in the portion of the metal layer pattern above where a functional layer is not formed, and A transparent display characterized by the above-mentioned light-emitting diode (LED) being surface-mounted (SMT: Surface Mount Technology).
In claim 1, A transparent display, wherein the functional layer is configured to cover all or part of the metal layer pattern.
In claim 1, The above metal layer is a transparent display having a thickness of 3㎛ to 120㎛.
In claim 1, A transparent display comprising one or more metal layers selected from the group consisting of copper (Cu), aluminum (Al), nickel (Ni), chromium (Cr), silver (Ag), iron (Fe), gold (Au), cobalt (Co), titanium (Ti), and tungsten (W).
In claim 1, The above adhesive layer is a transparent display having a thickness of 5㎛ to 50㎛.
In claim 1, A transparent display that does not include a separate member between the metal layer and the adhesive layer.
In claim 1, The above adhesive layer is a transparent display having an adhesion strength of 5B or higher with a glass substrate.
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In claim 1, A transparent display further comprising a transparent cover on the outermost portion corresponding to the glass substrate of the optical laminate.
In claim 9, The above transparent cover is one or more selected from glass, wired glass, colored glass, magic mirror, and holographic glass, a transparent display.
In claim 10, A transparent display comprising, where the above-mentioned transparent cover is glass, one or more selected from wired glass, colored glass, magic mirror, and holographic glass.
A step of preparing a metal thin film comprising a silicone-based adhesive layer formed on one side of a metal layer, a first protective film provided on one side of the silicone-based adhesive layer, and a second protective film provided on the other side of the metal layer; A step of peeling off the first protective film of the metal thin film above; A step of bonding the metal thin film so that an adhesive layer is disposed on one side of a glass substrate; A step of peeling off the second protective film of the metal thin film above; A step of patterning the metal layer to form a metal layer pattern; A step of forming a functional layer in the portion where the above metal layer pattern is not formed; and The method includes the step of surface mounting (SMT: Surface Mount Technology) a light-emitting diode (LED) on a portion of the metal layer pattern where a functional layer is not formed; A method for manufacturing a transparent display, wherein the functional layer comprises a solder resist layer.
In claim 12, The step of forming the metal layer pattern above is the step of forming a photoresist pattern on one surface of the metal layer; A step of etching an exposed area of a metal layer by the above photoresist pattern; and A method for manufacturing a transparent display comprising the step of peeling off the above photoresist pattern.
In claim 13, A method for manufacturing a transparent display in which damage to the lower adhesive layer does not occur during the above-mentioned etching step.

Description

Optical laminate, transparent display comprising the same, and manufacturing method for the same The present invention relates to an optical laminate, a transparent display including the same, and a method for manufacturing the same. Recently, the demand for large-area display devices in the display market has been steadily increasing due to technological advancements. Advanced electronic circuits and display business sectors, such as Micro-LEDs and Mini-LEDs capable of individually controlling brightness and contrast per unit area, are also undergoing technological development. Consequently, photolithography methods are being researched to fabricate electronic devices that simultaneously satisfy high resolution, contrast ratio quality, and large screen sizes. Korean Patent Publication No. 10-2019-0003025 also discloses a circuit board using a patterning method of a metal layer on top of a glass substrate and a method for manufacturing the same. However, various methods, such as plating or deposition of metal thin films, have been used to implement low-resistance metal wiring on conventional glass substrates, but each of these methods had limitations due to the increasing size of displays. To overcome these limitations, attempts have recently been made to develop a technology that involves bonding a metal thin film onto a glass substrate and then patterning the metal thin film using photolithography. However, this method of bonding a metal thin film onto a glass substrate had a problem in that not only was the adhesion between the metal thin film and the glass substrate insufficient, but the underlying adhesive layer exposed after patterning the metal layer was also damaged due to contact with the metal etching solution. Furthermore, when used in electronic devices exposed to the external environment for extended periods, such as transparent displays, heat resistance and reliability in high-temperature and high-humidity environments are critical; however, conventional acrylic or epoxy adhesives used in metal thin film films have had problems with insufficient heat resistance or reliability in such environments. To address this, when a metal thin film is bonded to a glass substrate using a silicone-based adhesive, surface roughness occurs on the adhesive surface after the metal thin film is patterned and peeled off, as the surface shape of the laminated metal remains intact. Consequently, when applied to a display, light is scattered from the adhesive layer surface where the metal thin film pattern is not formed, leading to increased haze and a decrease in visibility. Accordingly, there is a need to develop optical laminates and transparent displays with improved visibility, as well as adhesion to glass substrates, chemical resistance to metal layer etching solutions, heat resistance, and reliability in high-temperature and high-humidity environments. FIG. 1 is a figure showing an optical laminate according to one or a plurality of embodiments of the present invention. FIG. 2 is a drawing showing a transparent display according to one or a plurality of embodiments of the present invention. FIGS. 3a and FIGS. 3b are drawings illustrating a method for manufacturing an optical laminate according to one embodiment of the present invention. FIG. 3c is a diagram showing a step of mounting a light-emitting diode (LED) (70) according to an example of the present invention, for a method of manufacturing a transparent display. The present invention relates to an optical laminate and a transparent display having an adhesive layer comprising a silicone-based adhesive, and a method for manufacturing the same. By including a functional layer on the surface of the adhesive peeled off after patterning a metal thin film, the surface roughness is lowered and haze is reduced, thereby improving visibility. In particular, the optical laminate and transparent display according to the present invention include a solder resist layer as a functional layer, thereby suppressing the generation of bubbles within the structure of the optical laminate, and thus improving reliability and long-term storage reliability. More specifically, the present invention relates to an optical laminate and a method for manufacturing the same, comprising: a glass substrate; an adhesive layer formed on one surface of the glass substrate; a metal layer pattern formed on one surface of the adhesive layer; and a functional layer provided in a portion on one surface of the adhesive layer where the metal layer pattern is not formed, wherein the adhesive layer comprises a silicone-based adhesive and the functional layer comprises a solder resist layer. Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. However, the following drawings attached to this specification are intended to illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical co