DISPLAY APPARUTUS AND MANUFACTURING METHOD THEREOF

Disclosed embodiment provides a display apparatus including a polysiloxane layer formed by using a polysiloxane containing a pigment on the surface of an aluminum oxide layer of a display apparatus chassis. A display apparatus according to an embodiment includes: a display panel; and a chassis disposed on the outside of the display panel, and the chassis includes an aluminum oxide layer; and a polysiloxane layer disposed on the aluminum oxide layer, on its surface.

TECHNICAL FIELD

The present disclosure relates to a display apparatus.

BACKGROUND ART

A display apparatus includes a display panel for displaying images to display broadcasting signals or various formats of image data.

The display panel includes a self-emissive display panel and a non-emissive display panel. The self-emissive display panel includes a Cathode Ray Tube (CRT) panel, an Electro Luminescence (EL) panel, an Organic Light Emitting Diode (OLED) panel, a Vacuum Fluorescence Display (VFD) panel, a Field Emission Display (FED) panel, a Plasma Display Panel (PDP) panel, etc., and the non-emissive display panel includes a Liquid Crystal Display (LCD) panel.

The LCD panel includes a back light unit to emit white light, and a display panel to transmit or block light emitted from the back light unit.

DISCLOSURE

Therefore, it is an aspect of the disclosure to provide a display apparatus comprising a polysiloxane layer formed using a polysiloxane containing a pigment on the surface of an aluminum oxide layer of a display apparatus chassis.

In accordance with one aspect of the disclosure, a display apparatus includes: a display panel; and a chassis disposed on the outside of the display panel, and the chassis includes an aluminum oxide layer; and a polysiloxane layer disposed on the aluminum oxide layer, on its surface.

The polysiloxane layer may further include an acrylic.

The polysiloxane layer may include at least one of a white pigment, a blue pigment, a green pigment and a yellow pigment.

The polysiloxane layer may include a white pigment including at least one of a white lead, a zinc oxide, a zinc sulfide, an antimony oxide and a titanium oxide. The polysiloxane layer may include a blue pigment including at least one of 2CoO.Cr2O3.Al2O3, CoO.Al2O3and copper phtalocyanine.

The polysiloxane layer may include a green pigment including at least one of chloride copper phthalocyanine and bromide copper phthalocyannine.

The polysiloxane layer may include a yellow pigment including at least one of lead chromate (PbCrO4), lead sulfate (PbSO4), cadmium sulfide, hydrated ferric oxide (Fe2O3.H2O) and BaCrO4.

In accordance with another aspect of the disclosure, a manufacturing method of a display apparatus includes: forming an aluminum oxide layer by performing anodizing on the chassis surface of the display apparatus; and forming a polysiloxane layer on the aluminum oxide layer by using pigment and polysiloxane.

The polysiloxane layer may further include an acrylic.

The forming the polysiloxane layer may include: forming the polysiloxane layer on the aluminum oxide layer using a dipping or spray method.

The pigment may include at least one of a white pigment, a blue pigment, a green pigment and a yellow pigment.

The pigment may include a white pigment including at least one of a white lead, a zinc oxide, a zinc sulfide, an antimony oxide and a titanium oxide.

The pigment may include a blue pigment including at least one of 2CoO.Cr2O3.Al2O3, CoO.Al2O3and copper phtalocyanine.

The pigment may include a green pigment including at least one of chloride copper phthalocyanine and bromide copper phthalocyannine.

The pigment may include a yellow pigment including at least one of lead chromate (PbCrO4), lead sulfate (PbSO4), cadmium sulfide, hydrated ferric oxide (Fe2O3.H2O) and BaCrO4.

According to the display apparatus according to the disclosed embodiment, an conventional coloring and sealing process can be replaced with one process for forming a polysiloxane layer.

In addition, according to the display apparatus according to the disclosed embodiment, it is possible to provide improved surface hardness and corrosion resistance compared to the conventional anodizing method.

In addition, according to the display apparatus according to the disclosed embodiment, a chassis in which various and clear colors are implemented may be included.

MODE OF THE INVENTION

Configurations illustrated in the embodiments and the drawings described in the present specification are only the preferred embodiments of the present disclosure, and thus it is to be understood that various modified examples, which may replace the embodiments and the drawings described in the present specification, are possible when filing the present application.

The terms used in the present specification are used to describe the embodiments of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention is provided for illustration purpose only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. It will be understood that when the terms “includes,” “comprises,” “including,” and/or “comprising,” when used in this specification, specify the presence of stated features, figures, steps, components, or combination thereof, but do not preclude the presence or addition of one or more other features, figures, steps, components, members, or combinations thereof.

It will be understood that, although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the scope of the present disclosure. As used herein, the term “and/or” includes any and all combinations of one or more of associated listed items.

As used herein, the terms “unit”, “device, “block”, “member”, or “module” refers to a unit that can perform at least one function or operation, and may be implemented as a software or hardware component such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC). However, the term “unit”, “device”, “block”, “member”, or “module” is not limited to software or hardware. The “unit”, “device”, “block”, “member”, or “module” may be stored in accessible storage medium, or may be configured to run on at least one processor.

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the appended drawings.

FIG. 1illustrates an external appearance of a display apparatus according to an embodiment of the present disclosure.FIG. 2illustrates an exploded perspective view of a display apparatus according to an embodiment of the present disclosure.FIG. 3illustrates a cross-sectional view of a display apparatus according to an embodiment of the present disclosure.

Referring toFIG. 1, a display apparatus1is an apparatus capable of processing image signals to create an image, and visually displaying the image. Hereinafter, an example in which the display apparatus1is television (TV) is shown. However, the display apparatus1may be any other device, such as a monitor, a portable multimedia device, and a portable communication device, which can visually display images.

Referring toFIGS. 1 to 3, the display apparatus1may include a main body10to accommodate various components, and a display panel20to display an image that a user can recognize. The main body10may include a driving circuit30, a back light unit50, and an optical sheet40.

The main body10may include a top chassis11provided in the front part of the display apparatus1, a bottom chassis13provided in the back part of the display apparatus1, and a mold frame15provided in the inside of the display apparatus1.

The top chassis11may be disposed to surround a surface of the display panel20on which images are displayed, thus preventing the edges of the display panel20from being exposed to the outside.

The bottom chassis13may be disposed to surround the other surface of the display panel20, which is opposite to the surface on which images are displayed, thus preventing various components included in the display apparatus1from being exposed to the outside. Also, the bottom chassis13may protect various components included in the display apparatus1from an external impact.

The mold frame15may limit movements of the display panel20, the optical sheet40, and the back light unit50, and fix the display panel20, the optical sheet40, and the back light unit50in the top chassis11and the bottom chassis13.

Aluminum oxide layer510and polysiloxane layer520formed through an anodizing method are provided on the surfaces of the top chassis and the bottom chassis according to the disclosed embodiment. Detailed description thereof will be described later.

The display panel20may display various images according to image signals received from the outside. The display panel20may be a self-emissive display panel in which a plurality of pixels configuring the display panel20themselves emit light to create an image, or a non-emissive display panel in which a plurality of pixels reflect/transmit/block light to create an image.

In the following description, it is assumed that the display panel20is a non-emissive display panel to reflect/transmit/block light emitted from the back light unit50to create an image.

The display panel20may include a liquid crystal layer (not shown), a pair of transparent electrode layers (not shown), a pair of transparent substrates (not shown), and a color filter array (not shown).

The liquid crystal layer may include liquid crystal, wherein the liquid crystal is a material in the intermediate state between crystal and liquid. The liquid crystal may show optical properties according to a change of an applied voltage. For example, the liquid crystal may change its molecular arrangement according to a change of an applied electric field.

On both sides of the liquid crystal layer, the pair of transparent electrode layers may be provided to form an electric field in the liquid crystal layer. An electric field that is applied to the liquid crystal layer may change according to a voltage applied between the pair of transparent electrode layers.

The transparent electrode layers may include a plurality of gate lines (not shown), a plurality of data lines (not shown), and a plurality of thin film transistors (TFTs).

The gate lines may be arranged in a row direction to turn on/off the TFTs according to gate signals, and the data lines may be arranged in a column direction to transfer data signals to the plurality of pixels through the TFTs. An electric field that is applied to the liquid crystal layer may change according to the gate signals input through the gate lines and the data signals input through the data lines, and the change of the electric field may change the molecular arrangement of liquid crystal. Also, the molecular arrangement of liquid crystal enables the liquid crystal layer to transmit or block light.

The gate lines and the data lines may be formed with Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

The pair of transparent substrates (not shown) may form an external appearance of the display panel20, and protect the liquid crystal layer and the transparent electrode layers. The transparent substrates may be fabricated with tempered glass or a transparent film having high light transmittance.

The color filter layer may include a red filter, a blue filter, and a green filter formed in an area corresponding to each pixel so that the plurality of pixels configuring the display panel20can display colors independently.

As such, the display panel20may block or transmit light generated by the back light unit50which will be described below, to thereby create an image. More specifically, the individual pixels configuring the display panel20may block or transmit light emitted from the back light unit50to thereby create an image having various colors.

The driving circuit30may provide a driving signal for driving the display panel20to the display panel20. The driving circuit30may include a gate driving circuit31and a data driving circuit33.

The gate driving circuit31may be connected to the gate lines of the display panel20to transfer gate signals to the gate lines. Also, the data driving circuit33may be connected to the data lines of the display panel20to transfer data signals to the data lines.

The back light unit50may be disposed behind the display panel20, and generate light that is used by the display panel20to create an image. The back light unit50may be an edge type back light unit in which light sources are disposed along edges, or a direct type back light unit in which light sources are disposed behind the display panel20.

In the following description, the back light unit50is assumed to be an edge type back light unit in which light sources are disposed along edges, however, a quantum dot sheet57which will be described later may also be applied to a direct type back light unit.

The back light unit50may include, as shown inFIG. 3, a light source51configured to generate light, a light guide plate53configured to convert light generated by the light source51into sheet light, a reflector sheet55provided behind the light guide plate53and configured to reflect light output from the light guide plate53, and the quantum dot sheet57configured to receive light from the light guide plate53and to output white light (light resulting from mixing light of various colors). If the back light unit50is a direct type back light unit, a plurality of light sources may be arranged on the front surface of the reflector sheet55, and a diffusion plate, instead of the light guide plate53, may be used.

The light source51may be, as shown inFIG. 3, positioned along an edge of the light guide plate53, to output light toward the light guide plate53.

The light source51may output light (monochromatic light) of a single wavelength (single color), or light (white light) resulting from mixing light of a plurality of wavelengths. Since the back light unit50includes the quantum dot sheet57, the light source51may be a light source of outputting monochromatic light, specifically, light of a blue color having a short wavelength. In the following description, the light source51is assumed to output light of a blue color (hereinafter, simply referred to as blue light).

The light source51may be Light Emitting Diode (LED) or Cold Cathode Fluorescence Lamp (CCFL) having a low amount of heat generation.

In the edge type back light unit50, the light guide plate53may change a propagating direction of light incident to the lateral side so as to cause the light to exit the front surface53a. In order to change the propagating direction of light, a plurality of convex stripe patterns may be formed on the front surface53aof the light guide plate53, and a plurality of dots may be formed on the rear surface53bof the light guide plate53. The sizes and intervals of the convex stripe patterns and the dots may be adjusted to uniformly emit light toward the front surface53aof the light guide plate53.

Also, the convex stripe patterns formed on the front surface53aof the light guide plate53may be patterns embossed through a printing method, and the dots formed on the rear surface53bof the light guide plate53may be dots engraved using laser.

As shown inFIG. 3, a part L1of light incident to the inside of the light guide plate53may be scattered by the dots formed on the rear surface53bof the light guide plate53and then exit the front surface53aof the light guide plate53, and the other part L2of the light may be reflected to the inside of the light guide plate53by the reflector sheet55provided on the rear surface53bof the light guide plate53. The reflected light L2may arrive at the center area of the light guide plate53, and be scattered at the center area of the light guide plate53to then exit the front surface53aof the light guide plate53.

As such, due to refraction, reflection, and scattering of light occurred in the inside of the light guide plate53, the light guide plate53may emit light uniformly through the front surface53a.

The light guide plate53may be made of poly methyl methacrylate (PMMA) or polycarbonate (PC) having transparency and high strength.

The reflector sheet55may be provided on the rear surface of the light guide plate53, as described above, and may reflect a part of light arrived at the rear surface53aof the light guide plate53to the inside of the light guide plate53.

The reflector sheet55may be fabricated by coating a base material with a material having high reflectivity. For example, the reflector sheet55may be fabricated by coating a base material such as polyethylene terephthalate (PET) with polymer having high reflectivity.

The quantum dot sheet57may convert the light exiting the front surface53bof the light guide plate53into white light.FIG. 4shows the quantum dot sheet57according to an embodiment of the present disclosure.

As shown inFIG. 4, the quantum dot sheet57according to an embodiment of the present disclosure may include a fluorescent member57bincluding quantum dots QD, and barrier films configured to prevent the quantum dots QD from being exposed to oxygen or moisture. The barrier films may include a first barrier film57cdisposed on the rear surface of the fluorescent member57b, and a second barrier film57adisposed on the front surface of the fluorescent member57b.

The quantum dot QD is a small globe-shaped semiconductor particle having a nanometer size (nm, 1/1,000,000,000 m), and may be composed of a central body having a size of about 2 to 10 nm and a shell made of zinc sulfide ZnS. The central body of the quantum dot QD may be made of cadmium selenite CdSe, cadmium telluride CdTe, or cadmium sulfide CdS.

If a voltage is applied to the quantum dot QD, the quantum dot QD emits light or absorbs light to emit light of a specific wavelength.

The electrons of the quantum dots QD are at a low energy level (or band) in a stable state. In this state, if the quantum dots QD absorb light from the outside, the electrons at the low energy level transit to a high energy level (or band). Since the electrons at the high energy level are in an unstable state, the electrons again transit from the high energy level to the low energy level. When the electrons transit from the high energy level to the low energy level, the electrons may emit light corresponding to an energy difference between the high energy level and the low energy level. The wavelength of the emitted light may be decided by the energy difference between the high energy level and the low energy level.

Particularly, the smaller size of a quantum dot QD emits light of the shorter wavelength, and the larger size of a quantum dot QD emits light of the longer wavelength. For example, a quantum dot QD having a diameter of 2 nm may emit blue light, and a quantum dot QD having a diameter of about 10 nm may emit red light.

Also, quantum dots QD of various sizes may be used to output various wavelengths of light ranging from red light to blue light. In other words, quantum dots QD having various sizes may be used to generate light (white light) having natural colors. The fluorescent member57bof the quantum dot sheet57may be fabricated by distributing the quantum dots QD in a resin. The resin may be made of a polymer acrylate resin material.

Each of the barrier films57aand57cmay be formed with polyethylene terephthalate (PET), and may include a transparent film to protect the fluorescent member57bfrom an external force, and a barrier layer coated on the transparent film in order to prevent moisture and oxygen from permeating the fluorescent member57b. The barrier layer may also be formed with silicon oxide SiO or SiO2for transparency.

If light is incident to the quantum sheet57from the light guide plate53, the incident light may excite electrons of the quantum dots QD included in the quantum dot sheet57. In other words, electrons at a low energy level (or band) of the quantum dots QD may transit to a high energy level (or band) by the incident light.

When the excited electrons transit from the high energy level to the low energy level, the quantum dots QD may output light (white light) of various wavelengths according to their sizes. The light of various wavelengths may form an image through the optical sheet40and the display panel20.

As described above, the back light unit50may include the light source51, the light guide plate53, the reflector sheet55, and the quantum dot sheet57to emit uniform sheet light.

The optical sheet40may refract or scatter light in order to widen a viewing angle of the display apparatus1and increase the brightness of the display apparatus1. The optical sheet40may include various sheets. For example, the optical sheet40may include a diffusion sheet41, a prism sheet43, a protection sheet45, and a Double Brightness Enhancement Film (DBEF)47(seeFIG. 2).

The diffusion sheet41may diffuse light emitted from the back light unit50over the surface so that the entire screen of the display apparatus1shows uniform colors and brightness. Since the light emitted from the light guide plate53passed through the patterns formed on the front surface53aof the light guide plate53, the patterns formed on the front surface53aof the light guide plate53may be recognized from the light emitted from the light guide plate53.

In order to prevent the patterns formed on the front surface53aof the light guide plate53from being recognized from the light emitted from the light guide plate53, the diffusion sheet41may diffuse the light emitted from the light guide plate53in a direction that is vertical to the emitting direction of the light.

In other words, the diffusion sheet41may diffuse light emitted from the back light unit50to maintain the brightness of the entire screen uniform. According to another embodiment, instead of the diffusion sheet41, a microlens sheet which can diffuse light, like the diffusion sheet41, and widen a viewing angle may be used.

While the light passing through the diffusion sheet41is diffused in the direction that is vertical to the surface of the diffusion sheet41, the brightness of the light may be sharply reduced. The prism sheet43may refract or focus the light diffused by the diffusion sheet41to thereby increase the brightness of the light.

The prism sheet43may include a plurality of prism patterns, each having a trigonal prism shape, and the prism patterns may be arranged adjacent to each other so as to form a plurality of bands. That is, the prism patterns may be repetitive patterns of mountains and valleys, and may protrude in rows toward the display panel20

The protection sheet45may protect various components included in the back light unit50from an external impact or foreign materials. Since the prism sheet43is vulnerable to scratches, the protection sheet45may prevent the prism sheet43from being scratched.

The DBEF47may be a kind of a polarizing film, and is also called a reflective polarizing film. The DBEF47may transmit polarized light incident in a direction that is parallel to the polarizing direction of the DBEF47, among light emitted from the back light unit50, and reflect polarized light incident in a direction that is different from the polarizing direction of the DBEF47, among the light emitted from the back light unit50.

The light is a traverse wave that vibrate in a direction that is vertical to its propagation direction. The polarizing film may transmit light vibrating in a specific direction and absorb light vibrating in the other directions.

As described above, the DBEF47may reflect polarized light incident in a direction that is different from the polarizing direction of the DBEF47.

Meanwhile, an aluminum oxide layer510through an anodizing method is formed on the chassis surface to improve color and corrosion resistance. In general, the anodizing method is a process of realizing color and corrosion resistance by forming an aluminum oxide layer510on an aluminum surface by performing a process of pickling/washing/anodizing/sealing on aluminum processed into the chassis shape of a display apparatus.

More specifically, the anodizing method generally forms an aluminum oxide (Al2O3) layer on the aluminum surface through a process of degreasing, rinsing, etching, polishing, rinsing, desmutting, rinsing, anodizing, rinsing, coloring, rinsing, sealing, rinsing, drying

In general, in the case of the anodizing method, only dyes and metal pigments (inorganic pigments) can be used in the coloring process, so there is a limit to the color that can be realized. Also, hydration sealing treatment/metal salt sealing treatment/organic sealing treatment, which is a general sealing method used for general anodizing methods, uses nickel fluoride, etc., and there is an environmental problem. After sealing, the hardness is formed at the maximum level of 1H˜2H.

The chassis of the display apparatus according to the disclosed embodiment applies a ceramic layer such as polysiloxane as the last layer formed during the anodizing method, thereby simplifying the process and providing various colors and excellent surface hardness and corrosion resistance. Hereinafter, an anodizing method applied to the display apparatus chassis according to the disclosed embodiment will be described in detail.

FIG. 5illustrates a chassis surface layer formed by an anodizing method according to an embodiment of the present disclosure.

As illustrated inFIG. 5, the chassis surface of the display apparatus according to the disclosed embodiment includes an aluminum oxide layer510formed by an anodizing process on the aluminum500surface and a polysiloxane layer520formed on the aluminum oxide layer510.

The aluminum oxide layer510formed on the aluminum500surface is formed by an anodizing method. The polysiloxane layer520formed on the aluminum oxide layer510may be formed by dipping or spraying method.

The polysiloxane layer520may be formed by applying a polysiloxane containing pigment onto the aluminum oxide layer510by the above-described dipping or spraying method.

The polysiloxane constituting the polysiloxane layer520may be composed of only polysiloxane or a combination of acrylic and polysiloxane.

The pigment included in the polysiloxane layer520may include at least one of white pigment, blue pigment, green pigment, and yellow pigment. The white pigment may include at least one of White Lead, Zinc Oxide, Zinc Sulfide, Antimony Oxide and Titanium Oxide The blue pigment may include at least one of 2CoO.Cr2O3.Al2O3, CoO.Al2O3and Copper Phtalocyanine. The green pigment may include at least one of Chloride Copper Phthalocyanine and Bromide Copper Phthalocyannine. The yellow pigment may include at least one of Lead Chromate (PbCrO4), Lead Sulfate (PbSO4), Cadmium Sulfide, Hydrated Ferric Oxide (Fe2O3.H2O) and BaCrO4. The above-mentioned color and type of pigment are only examples, and the color or type of pigment is not limited thereto.

In general, the anodizing method includes coloring and sealing processes as separate processes, as described above. However, in the anodizing method according to the disclosed embodiment, it is possible to implement color while replacing the coloring process and the sealing process performed in separate processes with a single process of forming a polysiloxane containing pigment on an aluminum oxide layer510.

In addition, in general, in the case of the coloring process in the anodizing method, only dyes and inorganic pigments can be used limitedly, so there is a limit to the color that can be realized. However, as described above, the pigment included in the polysiloxane layer520according to the disclosed embodiment may include not only inorganic pigments but also organic pigments, and thus various colors can be implemented.

In the case of forming a polysiloxane layer (520), an improved hardness is exhibited than that of a general anodizing method. As described above, after coating the polysiloxane on the aluminum oxide layer510by dipping or spraying, after drying at 150° C. for 20 minutes, the hardness test was conducted through a pencil hardness test. As a result, while the pencil hardness of the chassis surface subjected to the general coloring and sealing process is included in the range of 1H to 2H, the pencil hardness of the chassis surface on which the polysiloxane layer520is formed is included in the improved 4H to 6H range according to the disclosed embodiment.

As described above, the anodizing method according to the disclosed embodiment can replace the coloring and sealing process with one process of forming the polysiloxane layer520by forming the polysiloxane layer520on the aluminum oxide layer510, and it is possible to realize various colors and improved hardness.

FIG. 6illustrates a manufacturing method of a display apparatus according to an embodiment of the present disclosure.

Referring toFIG. 6, a manufacturing method of a display apparatus according to the disclosed embodiment includes a process of forming an aluminum oxide layer510on an aluminum500surface of the chassis through an anodizing process (600) and of drying the chassis (620) after forming a polysiloxane layer520on the aluminum oxide layer510(610).

The anodizing method according to the disclosed embodiment forms an aluminum oxide (Al2O3) layer on the aluminum of chassis through a process of degreasing, rinsing, etching, polishing, rinsing, desmutting, rinsing, anodizing, rinsing, forming the polysiloxane layer520and drying, and forms a polysiloxane layer520on the aluminum oxide layer510.

The chassis of the display apparatus according to the disclosed embodiment applies a ceramic layer such as polysiloxane as the last layer formed during the anodizing method, thereby simplifying the process and providing various colors and excellent surface hardness and corrosion resistance.

As illustrated inFIG. 5, the chassis surface of the display apparatus according to the disclosed embodiment includes an aluminum oxide layer510formed by an anodizing process on the aluminum500surface and a polysiloxane layer520formed on the aluminum oxide layer510.

The aluminum oxide layer510formed on the aluminum500surface is formed by an anodizing method. The polysiloxane layer520formed on the aluminum oxide layer510may be formed by dipping or spraying method.

The polysiloxane layer520may be formed by applying a polysiloxane containing pigment onto the aluminum oxide layer510by the above-described dipping or spraying method. The polysiloxane constituting the polysiloxane layer520may be composed of only polysiloxane or a combination of acrylic and polysiloxane.

The pigment included in the polysiloxane layer520may include at least one of white pigment, blue pigment, green pigment, and yellow pigment. The white pigment may include at least one of White Lead, Zinc Oxide, Zinc Sulfide, Antimony Oxide and Titanium Oxide The blue pigment may include at least one of 2CoO.Cr2O3.Al2O3, CoO.Al2O3and Copper Phtalocyanine. The green pigment may include at least one of Chloride Copper Phthalocyanine and Bromide Copper Phthalocyannine. The yellow pigment may include at least one of Lead Chromate (PbCrO4), Lead Sulfate (PbSO4), Cadmium Sulfide, Hydrated Ferric Oxide (Fe2O3.H2O) and BaCrO4. The above-mentioned color and type of pigment are only examples, and the color or type of pigment is not limited thereto.

In general, the anodizing method includes coloring and sealing processes as separate processes, as described above. However, in the anodizing method according to the disclosed embodiment, it is possible to implement color while replacing the coloring process and the sealing process performed in separate processes with a single process of forming a polysiloxane containing pigment on an aluminum oxide layer510.