CN-122029964-A - Coating structure and method for producing a coating structure

Abstract

According to an embodiment, a coating structure is disclosed that includes a substrate, a first film disposed on the substrate, a second film disposed on the first film, and a metal pattern protruding from the substrate. The metal pattern penetrates the first film and penetrates a portion of the second film.

Inventors

• LI KUITAI

Assignees

• LG伊诺特有限公司

Dates

Publication Date

20260512

Application Date

20240926

Priority Date

20231011

Claims (10)

1. 1. A coating structure comprising: A substrate; A first thin film disposed on the substrate; A second film disposed on the first film, and A metal pattern protruding from the substrate, Wherein the metal pattern passes through the first film and partially passes through the second film.
2. 2. The coating structure of claim 1, wherein the first film and the second film overlap in a first direction, and The first direction is an incident direction of an optical signal and is perpendicular to the first film and the second film.
3. 3. The coating structure of claim 2, wherein the first film comprises a first surface and a second surface disposed opposite the first surface, The substrate includes an incidence surface on which the optical signal is incident, and The first surface is in contact with the incident surface.
4. 4. The coating structure according to claim 3, wherein the metal pattern is provided on the incident surface, passes through the second surface of the first film, and protrudes in the first direction.
5. 5. The coating structure of claim 1, wherein the first film has a refractive index of 1.3 to 3.0.
6. 6. The coating structure of claim 5, wherein the first film comprises a metal oxide.
7. 7. The coating structure of claim 6, wherein the first film comprises TiO 2 , znO, or Al 2 O 3 .
8. 8. The coating structure according to claim 2, wherein a thickness of the first film in the first direction is 0.1 to 0.7 times a height of the metal pattern in the first direction.
9. 9. The coating structure of claim 8, wherein a height of the metal pattern in the first direction is less than a sum of thicknesses of the first and second films in the first direction.
10. 10. The coating structure of claim 1, wherein the second film has a refractive index of 1.2 to 1.4.

Description

Coating structure and method for producing a coating structure Technical Field Embodiments relate to coating structures. More particularly, embodiments relate to low reflection coating structures having high transmittance and low reflectance in the wide-angle visible wavelength band. Background When external image information is transmitted to the image sensor through the lens, reflection may occur due to a difference in refractive index between the external environment and the lens. When light enters the lens at a high incident angle, multiple reflections occur inside the lens, thereby creating a ghost image. Such ghost images may degrade the performance of the image sensor. Between two materials having different refractive indices, light is partially reflected, resulting in losses due to fresnel reflection. This loss reduces the intensity of the light reaching the sensor and can affect the quality of the image. When the reflectivity between the lens and the external environment (air) is high, light that has reached the sensor after internal reflection of the lens may create ghost images. In particular, for light entering at a wide angle, the reflectance between the two materials tends to increase, making it necessary to prevent the generation of ghost images due to wide angle incidence. Disclosure of Invention [ Technical problem ] Embodiments provide a coating structure having high transmittance and low reflectance in a wide-angle visible wavelength band, and a method of manufacturing the same. Embodiments also provide a coating structure capable of preventing generation of ghost images and a method of manufacturing the same. The problems to be solved by the embodiments are not limited thereto, and also include objects or effects that can be understood from the manner of solving the problems or from the embodiments described below. [ Technical solution ] The coating structure according to an embodiment includes a substrate, a first film disposed on the substrate, a second film disposed on the first film, and a metal pattern protruding from the substrate, wherein the metal pattern passes through the first film and partially passes through the second film. The first film and the second film may overlap in a first direction, and the first direction may be an incident direction of light and may be perpendicular to the first film and the second film. The first film may have a refractive index of 1.3 to 3.0. The first thin film may include a metal oxide. The first film may include TiO 2, znO, or Al 2O3. The thickness of the first film in the first direction may be 0.1 to 0.7 times the height of the metal pattern in the first direction. The second film may have a refractive index of 1.2 to 1.4. The second film may comprise a hydrophobic material. The second film may include Polytetrafluoroethylene (PTFE) or Fluorinated Ethylene Propylene (FEP). The thickness of the second film in the first direction may be 50nm to 200 nm a. The metal pattern may have a refractive index of 1.3 to 3.0. The metal pattern may include a metal oxide. The metal pattern may include TiO 2, znO, or Al 2O3. The height of the metal pattern in the second direction may be 50nm to 300 nm. The refractive index of the first film and the refractive index of the metal pattern may be greater than the refractive index of the second film. A method of manufacturing a coating structure according to an embodiment may include dispersing PS microspheres on a substrate, depositing a metal film on the substrate, removing the PS microspheres, forming a random pattern using the metal film, forming an oxide film on the substrate, and forming a hydrophobic film on the oxide film. [ Advantageous effects ] According to the embodiment, a coating structure having high transmittance and low reflectance in a wide-angle visible wavelength band can be realized. In addition, a coating structure capable of preventing the generation of ghost images can be realized. The various and beneficial advantages and effects of the present invention are not limited to the foregoing description, and will be more readily understood in describing particular embodiments of the invention. Drawings Fig. 1 and 2 are conceptual views of a coating structure according to an embodiment. Fig. 3 is a flowchart illustrating a method of manufacturing a coating structure according to an embodiment. Fig. 4 to 9 are diagrams illustrating a method of manufacturing a coating structure according to an embodiment. Fig. 10 is a graph showing transmittance of incident light with wavelength of a coating structure according to an embodiment. Fig. 11 to 13 are graphs showing transmittance of incident light with an incident angle of the coating structure according to the embodiment. Detailed Description Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to the