KR20180064958A - Cover glass with color coating - Google Patents

Abstract

The present invention relates to cover glass with color coating and, more specifically, to cover glass with color coating, comprising: a glass base; a concavo-convex portion formed on a front surface of the glass base; an opaque layer formed on the concavo-convex portion; and a color coating layer formed on the opaque layer. The cover glass with color coating according to the present invention forms, as the color coating layer, a metal nitride layer or the like with high hardness, chemical resistance, weather resistance and durability on the concavo-convex portion with a range of 0.1-2 micrometer such that a color is able to be formed directly on an outer surface of the cover glass by a simple process while making a color sense and a stereoscopic sense remarkable, and it is possible to perform color coating even on a complex three dimensional shaped glass cover because of not using a film having been conventionally attached on a glass base.

Description

{COVER GLASS WITH COLOR COATING}

The present invention relates to a color-coated cover glass, and more particularly to a glass-coated substrate. An irregularity formed on the front surface of the glass substrate; A opaque layer formed on the unevenness; And a color coating layer formed on the opaque layer.

2. Description of the Related Art In recent years, the importance of design has become more and more important in electronic or electric devices such as home appliances and mobile phones. Particularly, in order to enhance the appearance, gloss and appearance surface patterns are increasingly adopted. Conventionally, as a technique for forming a gloss and a hair line, there has been known a technique of forming a multi-deposited layer in which TiO 2 and SiO 2 are alternately deposited on the surface of a plastic injection part having excellent gloss such as PC and coating a protective layer for providing high gloss thereon And so on. Korean Patent Laid-Open Publication No. 2013-12783 discloses a fine uneven layer of a predetermined plastic material having a fine uneven pattern on its surface; And a multi-deposition layer formed on the fine uneven layer and formed by alternately depositing two materials having different reflectance and refractive index of light a predetermined number of times. However, the above-described conventional housing device also has a problem in that it is difficult to differentiate because of the small number of expressible colors and the effect of multi-color implementation. In addition, the multicolor realized by the conventional technique has a problem in that it can express only fixed multicolor regardless of the change of the surrounding environment.

Meanwhile, in recent years, there has been an increasing trend of finishing metal and / or glass materials on the outer appearance of electronic products in order to enhance the appearance. In particular, the use of expensive or expensive smart devices such as glass or metal in cover materials is becoming common. Also, the design of the cover has been changed from the existing plan structure to the color implementation which is gradually stereoscopic and emotional. Therefore, there is a limitation in realizing a colorful color such as a metal texture as a general printing ink on a cover of a metal or a glass material. Therefore, a flexible film (PET or the like) coated with a metal film is attached to the back surface of the cover glass in order to provide a color feeling of metal feeling and a stereoscopic texture such as a hair line in an existing window glass or a cover glass. 1 is a process flow chart showing a process for color implementation of a conventional cover glass. However, in the above-mentioned conventional flexible film, the cover can be applied only in a plane (two-dimensional shape), and in the curved three-dimensional shape, it is impossible to complete attachment between the three-dimensional substrate and the film. Also, if a pattern is formed on the inner surface of the cover, a three-dimensional feeling will weaken the three-dimensional feeling, and the texture will not be felt. Also, as can be seen from FIG. 1, the film attaching structure raises an unnecessary thickness, has many processes such as a lami process, has a high defect rate, and has a problem in that it takes a lot of cost due to materials other than the coating and air.

Therefore, there has been an attempt to impart a stereoscopic texture directly to the back surface of the cover glass without attaching the flexible film. Korean Patent Laid-Open Publication No. 2016-75410 discloses a glass substrate, a pattern portion formed on the first surface of the glass substrate by etching, a multi-layer thin film portion formed by laminating the pattern portion so as to cover the pattern portion, And a printing portion formed to cover the multilayer thin film portion, wherein the pattern portion is formed such that light reflected by an outermost side disposed on a second surface opposite to the first surface is emitted in a plurality of angles Lt; / RTI > However, the cover glass described in the above document is formed only on the bezel portion which is a very small part of the cover, so that it is not enough to provide overall pattern formation or color feeling, and the portion where the pattern portion is formed is also present only inside the cover glass, I can not feel the texture.

Korean Patent Laid-Open Publication No. 2013-12783 Korean Patent Laid-Open Publication No. 2016-75410

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a color cover and a color cover which can be applied to a cover of a three-dimensional shape, Thereby providing a cover glass.

According to an aspect of the present invention, there is provided a display device comprising: a glass substrate; An irregularity formed on the front surface of the glass substrate; A opaque layer formed on the unevenness; And a color coating layer formed on the opaque layer.

Further, the present invention is characterized in that the average roughness 0.1 to 2 micrometers. ≪ Desc / Clms Page number 2 >

Also, the present invention provides a color coated cover glass characterized in that the color coating layer is made of at least one material selected from the group consisting of a metal oxide film, a nitride film, a carbonized film, and a metal mixed film.

The present invention also relates to a glass substrate, An irregularity formed on the front surface of the glass substrate; A color coating layer formed on the unevenness; And a opaque opaque layer formed on the back surface of the glass substrate.

The color-coated cover glass of the present invention is formed by forming a metal nitride film having high hardness, chemical resistance, weather resistance and durability on the unevenness in the range of 0.1 to 2 micrometers as a color coating layer to prominently show color and three- And color coating can be applied to a complicated three-dimensional glass cover without using a film conventionally used for attaching to a glass substrate.

1 is a process flow diagram illustrating a process for color implementation of a conventional cover glass
Figure 2 is a schematic representation of a process for manufacturing a color coated cover glass according to an embodiment of the present invention.
Figure 3 is a schematic representation of a process for manufacturing a color coated cover glass according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the drawings attached hereto.

A color coated cover glass of the present invention comprises: a glass substrate; An irregularity formed on the front surface of the glass substrate; A opaque layer formed on the unevenness; A structure including a color coating layer formed on the opaque layer or a glass substrate; An irregularity formed on the front surface of the glass substrate; A color coating layer formed on the unevenness; And a non-transparent layer formed on the rear surface of the glass substrate.

In this specification, 'cover glass' may include all kinds of glass or ceramic substrates including window glass. However, it is also possible to use a cover glass such as a window glass or a battery case, As a whole or a part of the housing provided in the housing. At this time, the cover glass can be applied to a camera window, function buttons, various decorations, and the like.

In the present invention, the glass substrate is not particularly limited, and the 'front surface' of the glass substrate means a portion exposed to the outside from the final product. The glass substrate does not only mean a glass material such as general glass or a conductive glass substrate such as FTO (F-doped SnO ₂ : SnO ₂ : F) or ITO, but also a glass material such as alumina, zirconia, silica, silicon nitride, silicon carbide, magnesium oxide And a substrate made of a ceramic material such as aluminum nitride.

In the present invention, the irregularities formed on the entire surface of the glass substrate can be obtained by directly etching the entire surface of the glass substrate, forming a surface roughness by a method such as sand blasting, or forming a product (for example, Siloxane, urethane, acrylic beads, and the like), and the like. When the irregularities are finely formed, there is an effect of preventing contamination due to fingerprints. Generally, a fluorine-based compound coating method is applied to the surface of the fingerprint to see the effect of the fingerprint. However, the duration of the fingerprint effect is usually only about 6 months, and the fingerprint effect is not It can not be said to be effective because it only makes it possible to clean the coated surface with less fingerprints and bury it. On the other hand, when the irregularities are formed on the surface as in the present invention, the entire surface of the finger is not contacted, and fingerprints are not easily adhered, and the haze value increases due to scattering of light due to irregularities. In addition, the effect of preventing fingerprints can be permanently maintained as long as unevenness does not disappear.

In the present invention, the color coating layer is formed on the opaque layer formed on the uneven or irregular surface. In the present invention, the unevenness can maximize the color of the color coating layer. Particularly, in the case of color coating, the thickness of the evaporated film varies depending on the shape of the solid body when the protruded solid body is coated, thereby causing a color change due to the path change when the light is reflected to the surface, And the incidence angle of the light due to the unevenness is generated, and various color change effects can be seen. While expecting such interference or scattering effect of light, it is also necessary to not easily recognize the presence of unevenness in the visual eye. The average roughness of the irregularities is preferably in the range of 0.1 to 2 micrometers. When the roughness of the unevenness is less than 0.1 micrometer, the shape of the unevenness is not properly realized and the effect of the internal stiffness is weak. On the other hand, when the roughness exceeds 2 micrometers, there is a problem that the strength of the tempered glass becomes weak It is because.

In the present invention, the color coating layer is an optical layer which is formed on the concavo-convex surface and develops color and / or pattern by reflection and interference of light. The material and the characteristic of the color layer are not particularly limited, but the durability, the chemical resistance, A nitride film, and a carbonized film formed by vapor deposition in consideration of the uniformity of the metal oxide film, and the like. The metal oxide film is not particularly limited and can be used as long as it is excellent in durability, chemical resistance, weather resistance, and the like. Examples of the metal oxide include zirconia (ZrO2), titanium dioxide (TiO2), alumina (Al2O3), tantalum oxides (Ta2O5), neodymium oxide (Nd2O5), praseodymium oxide (Pr2O3), praseodymium titanate (PrTiO3) At least one selected from the group consisting of oxides (La 2 O 3), niobium oxide (Nb 2 O 5), yttrium oxide (Y 2 O 3) and oxides of these alloys. The deposition can be performed by a known deposition method such as sputtering, E beam, PVD, or the like. In the present invention, the color of the color coating can be controlled by controlling the thickness of the single layer film or by controlling the thickness of the multilayer film of the high refractive film and the low refractive film (e.g., SiO 2). The Si3N4 film or the SiC film is particularly preferable for the present invention because the durability of the film is particularly good and the hardness of the film can be increased when it comes to the surface, and the hardness of the substrate (glass) can be increased to make it strong against scratches. In the present specification, the term 'high-refraction film' means a case where the refractive index is 1.5 or more, while a case where the refractive index is less than 1.5 is defined as a low refractive film. Is preferably referred to as a layer having a high refractive index (HI) when the refractive index of the high refractive film is 1.6 or more, more preferably 1.7 or more, more preferably 1.8 or more, and most preferably 1.9 or more. Preferably, the HI layer has a refractive index of less than 2.1. The layer of antireflective coating is referred to as a low index of refraction (LI) layer when the index of refraction is less than 1.5, preferably less than 1.48, more preferably less than 1.47. Preferably, the LI layer has a refractive index higher than 1.1. Examples of the high refractive index layer are generally metal oxides such as zirconia (ZrO2), titanium dioxide (TiO2), alumina (Al2O3), tantalum oxides (Ta2O5), neodymium oxide (Nd2O5), praseodymium oxide (Pr2O3), praseodymium titanate But is not limited to, at least one selected from the group consisting of PrTiO3, lanthanum oxide (La2O3), niobium oxide (Nb2O5), and yttrium oxide (Y2O3). Optionally, the HI layer may further comprise silica or other material having a low refractive index, if they have a refractive index of at least 1.5 as described above. Preferred materials include TiO2, PrTiO3, ZrO2, Al2O3, Y2O3, and mixtures thereof. Examples of low refractive layers include, but are not limited to, SiO2, or a mixture of silica and alumina, especially silica doped with alumina, the latter contributing to an increase in anti-reflective coating thermal resistance. Preferably, the LI layer is a layer comprising at least 80% by weight of silica, more preferably at least 90% by weight of silica, based on the total layer weight, and is even more preferably composed of a silica layer. Optionally, when the refractive index of the finally produced layer is less than 1.5, the LI layer may further comprise a material having a high refractive index. When an LI layer comprising a mixture of SiO2 and Al2O3 is used, it is preferable to use 1 to 10 wt%, more preferably 1 to 8 wt%, and still more preferably 1 to 10 wt%, based on the total weight of SiO2 + Al2O3, It is preferable to contain 5% by weight of Al2O3. For example, SiO2 doped with Al2O3 up to 4% by weight, or SiO2 doped with 8% Al2O3 may be employed. For example, a commercially available SiO2 / Al2O3 mixture can be used.

The following Tables 1 and 2 show the colorimetric reflection of a Si3N4 single-layer film having a refractive index of 2.01 and the reflection of a single layer film of a high-refractive-index layer Si3N4 (2.01) low refractive layer SiO2 (1.46) .

[Table 1]

[Table 2]

The color coating layer preferably has a thickness in the range of 0.05 to 1 micrometer. When the thickness of the color coating layer is less than 0.05 micrometer, there is a problem that color formation is difficult. On the other hand, when the thickness exceeds 1 micrometer, tensile or compressive stress due to the coated thin film layer becomes large, As shown in FIG.

In the present invention, the opaque layer may be formed on the unevenness or on the rear surface of the glass substrate on which the unevenness is formed. The opaque layer acts as a kind of background to express the color of the color coating layer of the front part in a more colorful manner and to exhibit the effect of covering an inner circuit or a substrate structure. The opaque layer can be formed in a silk screen printing form using a commonly used printing solution for each color, and the thickness can be several micro to several tens of micrometers depending on the number of layers of the printing film. In addition, an opaque layer having a mirror effect can be formed by vapor deposition. A metal layer (Sn, Si, etc.) having a low transmittance may be deposited by depositing a layer having a thickness of 100 nm or more.

The embodiments of the present invention described above should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

Claims (8)

A glass substrate;
An irregularity formed on the front surface of the glass substrate;
A opaque layer formed on the unevenness;
And a color coating layer formed on the opaque layer. The method according to claim 1,
Wherein the average roughness of the unevenness ranges from 0.1 to 2 micrometers. The method according to claim 1,
Wherein the color coating layer is made of at least one material selected from the group consisting of a metal oxide film, a nitride film, a carbonized film, and a metal mixed film. The method of claim 3,
Wherein the color coating layer has a thickness in the range of 0.1 to 1 micrometer. A glass substrate;
An irregularity formed on the front surface of the glass substrate;
A color coating layer formed on the unevenness;
A color coated cover glass comprising an opaque layer formed on the back side of the glass substrate. 6. The method of claim 5,
Wherein the average roughness of the unevenness ranges from 0.1 to 2 micrometers. 6. The method of claim 5,
Wherein the color coating layer is made of at least one material selected from the group consisting of a metal oxide film, a nitride film, a carbonized film, and a metal mixed film. 6. The method of claim 5,
Wherein the color coating layer has a thickness in the range of 0.1 to 1 micrometer.

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