KR20200058819A - Alloy metal plate and deposition mask including the alloy metal plate - Google Patents

Abstract

According to an embodiment of the present invention, the present invention relates to an iron (Fe)-nickel (Ni) alloy metal plate of a deposition mask for OLED pixel deposition. The metal plate is formed by a plurality of crystal grains, and a maximum area of the crystal grains measured in the entire area of the metal plate is 700 um2 or less. According to an embodiment of the present invention, a maximum particle diameter of the crystal grains measured in the entire area of the metal plate is 30 um or less. According to an embodiment of the present invention, the quantity per unit area of the crystal grains is 0.20 to 0.25 ea/μm 2. According to the present invention, the deposition efficiency of a deposition mask can be improved and a deposition defect can be prevented.

Description

Alloy metal plate and deposition mask comprising the same {ALLOY METAL PLATE AND DEPOSITION MASK INCLUDING THE ALLOY METAL PLATE}

An embodiment relates to an iron (Fe) -nickel (Ni) alloy metal plate and a deposition mask for OLED pixel deposition produced by the alloy metal plate.

2. Description of the Related Art Display devices are applied to various devices. For example, the display device is applied to a large device such as a TV, a monitor, a public display (PD), as well as a small device such as a smart phone or a tablet PC. Particularly, in recent years, demand for ultra-high definition UHD (UHD) having a level of about 500 PPI (Pixel Per Inch) or higher has increased, and high-resolution display devices have been applied to small devices and large devices. Accordingly, interest in technologies for realizing low power and high resolution is increasing.

2. Description of the Related Art Display devices generally used may be largely classified into liquid crystal displays (LCDs) and organic light emitting diodes (OLEDs).

The LCD is a display device driven using a liquid crystal, and has a structure in which a light source including a Cold Cathode Fluorescent Lamp (CCFL) or a LED (Light Emitting Diode) is disposed under the liquid crystal. It is a display device that is driven by controlling the amount of light emitted from the light source using the liquid crystal disposed.

In addition, the OLED is a display device driven by using an organic material, and a separate light source is not required, and the organic material itself may serve as a light source and be driven with low power. In addition, OLEDs are drawing attention as display devices that can replace LCDs because they can express an infinite contrast ratio, have a response speed of about 1000 times faster than LCDs, and have excellent viewing angles.

In particular, in the OLED, the organic material included in the light emitting layer may be deposited on a substrate by a deposition mask called a fine metal mask (FMM), and the deposited organic material corresponds to a pattern formed in the deposition mask. Formed in a pattern, it can serve as a pixel. In detail, the deposition mask includes a through hole formed at a position corresponding to a pixel pattern, and red, green, and blue organic materials can be deposited on the substrate by passing through the through hole. have. Accordingly, a pixel pattern can be formed on the substrate.

The deposition mask may be made of a metal plate made of an iron (Fe) and nickel (Ni) alloy. For example, the deposition mask can be made of an iron-nickel alloy called invar. The deposition mask may include a through hole for depositing an organic material as described above, and the through hole may be formed by an etching process.

Meanwhile, a surface treatment process of removing impurities such as foreign substances and rust remaining on the surface of the metal plate is performed by etching the surface of the metal plate using an acidic etching solution before forming a through hole on the surface of the metal plate.

As the surface of the metal plate is etched by the surface treatment process, the impurities may be removed.

At this time, when the surface of the metal plate is not etched uniformly, a pitting phenomenon in which a plurality of pits or the like occurs on the surface of the metal plate may occur. This pitting phenomenon may cause defects in the formation of the through hole as the depth of the pit increases.

Accordingly, there is a problem in that characteristics such as particle diameter, shape, and depth of the through-holes formed on the surface of the metal plate are not uniform, and thus, the amount of organic substances passing through the through-holes decreases, resulting in lower deposition efficiency. have. In addition, there is a problem in that deposition defects occur because organic substances deposited on the substrate are also not uniform.

Therefore, there is a need for a new alloy metal plate capable of solving the above problems and a deposition mask comprising the same.

An embodiment is to provide a deposition mask for depositing an iron and nickel alloy metal plate and an OLED pixel produced therefrom, which can improve the efficiency of a deposition mask produced through the metal plate by reducing the surface fit of the metal plate.

In the iron (Fe) -nickel (Ni) alloy metal plate of the deposition mask for the OLED pixel deposition according to the embodiment, the metal plate is formed by a plurality of crystal grains, the maximum of the crystal grains measured in the total area of the metal plate The area is 700 µm ² or less.

In the iron (Fe) -nickel (Ni) alloy metal plate of the deposition mask for OLED pixel deposition according to the embodiment, when measured from the small crystal grains among the total grains measured in the total area of the metal plate. The maximum area of the 95% crystal grain is 60 µm ² or less.

In the iron (Fe) -nickel (Ni) alloy metal plate of the deposition mask for OLED pixel deposition according to the embodiment, the maximum particle size of the crystal grains measured in the entire area of the metal plate is 30 μm or less.

In the iron (Fe) -nickel (Ni) alloy metal plate of the deposition mask for OLED pixel deposition according to the embodiment, when measured from the small crystal grains among the total grains measured in the total area of the metal plate. The maximum grain size of the 95% crystal grain is 9 µm or less.

In the iron (Fe) -nickel (Ni) alloy metal plate of the deposition mask for OLED pixel deposition according to the embodiment, the quantity per unit area of the plurality of crystal grains is 0.20 ea / µm ² to 0.25 ea / µm ² .

The nickel and iron alloy metal plate according to the embodiment may control the area, particle size, and size of the crystal grains to reduce the number of pits generated after the surface treatment.

In detail, the maximum area of the crystal grains can be controlled to 700 μm ² or less, and the grain size of the crystal grains can be controlled to 30 μm or less. In addition, the size of grains can be minimized to increase the number of grains per unit area.

That is, by controlling the maximum area and particle size of the crystal grains to a certain size or less, the grain density of the surface formed by the crystal grains increases, thereby forming grooves, i.e., pits, of the surface generated during the etching process of the surface treatment. Can be minimized.

Therefore, when manufacturing the marks for deposition using the metal plate, it is possible to uniformize characteristics such as particle diameter, shape, and depth of the through-holes formed in the metal plate, thereby improving the deposition efficiency of the deposition mask, Bad deposition can be prevented.

1 is a sectional view showing a metal plate according to an embodiment.
2 and 3 are views showing a scanning electron microscope (SEM) photograph of the surface of a metal plate according to an embodiment.
4 and 5 are views showing a scanning electron microscope (SEM) photograph of the surface of a metal plate according to a comparative example.
6 is a view showing a scanning electron microscope (SEM) photograph of a surface-treated metal plate according to an embodiment.
7 is a view showing a scanning electron microscope (SEM) photograph of a surface-treated metal plate according to a comparative example.
8 and 9 are graphs showing crystal grain areas of metal plates according to Examples and Comparative Examples.
10 and 11 are graphs showing crystal grain sizes of metal plates according to Examples and Comparative Examples.
12 is a graph showing the number of crystal grains of a metal plate according to Examples and Comparative Examples.
13 to 15 are conceptual views illustrating a process of depositing an organic material on a substrate using a deposition mask made of a metal plate according to an embodiment.
16 is a plan view of a deposition mask according to an embodiment.
17 is a view showing a plan view of an effective portion of a deposition mask according to an embodiment.
18 is a view showing another plan view of a deposition mask according to an embodiment.
FIG. 19 is a diagram showing a cross-sectional view of A-A 'and B-B' of FIG. 17 overlapping.
20 is a view showing a cross-sectional view in the direction BB 'of FIG. 17.
21 is a view showing a manufacturing process of a deposition mask according to an embodiment.
22 and 23 are diagrams illustrating deposition patterns formed through a deposition mask according to an embodiment.

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 some embodiments described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of its constituent elements may be selectively selected between embodiments. It can be used by bonding and substitution.

In addition, the terms used in the embodiments of the present invention (including technical and scientific terms), unless specifically defined and described, can be generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and commonly used terms, such as predefined terms, may interpret the meaning in consideration of the contextual meaning of the related technology.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In the present specification, the singular form may also include a plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and B, C”, A, B, and C may be combined. It can contain one or more of all possible combinations.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the term is not limited to the nature, order, or order of the component.

And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also to the component It may also include a case of 'connected', 'coupled' or 'connected' due to another component between the other components.

Further, when described as being formed or disposed in the "top (top) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other It also includes a case in which another component described above is formed or disposed between two components.

In addition, when expressed as “up (up) or down (down)”, it may include the meaning of the downward direction as well as the upward direction based on one component.

Hereinafter, an iron (Fe) -nickel (Ni) alloy metal plate and a deposition mask for OLED pixel deposition using the same will be described with reference to the drawings.

1 is a view showing a cross-sectional view of an alloy metal plate according to an embodiment.

The metal plate 10 may include a metal material. For example, the metal plate 10 may include a nickel (Ni) alloy. In detail, the metal plate 10 may include an iron (Fe) and a nickel (Ni) alloy.

For example, the metal plate 10 may include the iron in an amount of about 60% to about 65% by weight, and the nickel in an amount of about 35% to about 40% by weight. In detail, the metal plate 10 may contain about 63.5% by weight to about 64.5% by weight of the iron, and about 35.5% by weight to about 36.5% by weight of the nickel.

The weight percentage of the metal plate 10 is a specimen (a * b * t) corresponding to the thickness (t) of the metal plate 10 by selecting a specific area (a * b) on the plane of the metal plate 10 It can be confirmed by using a method of sampling and dissolving it in a strong acid to investigate the weight percent of each component. However, the embodiment is not limited thereto, and the content may be confirmed by various methods.

In addition, the metal plate 10 is a small amount of carbon (C), silicon (Si), sulfur (S), phosphorus (P), manganese (Mn), titanium (Ti), cobalt (Co), copper (Cu), It may further include at least one element of silver (Ag), vanadium (V), niobium (Nb), indium (In), and antimony (Sb). Here, a small amount may mean that it is 1% by weight or less. That is, the metal plate 10 may include Invar.

The invar is an alloy containing iron and nickel, and is a low thermal expansion alloy having a coefficient of thermal expansion close to zero. The invar is used in precision components, such as masks, and precision equipment because the thermal expansion coefficient is very small. Therefore, the deposition mask manufactured using the metal plate 10 may have improved reliability, thereby preventing deformation, and also increasing life.

The metal plate 10 including the iron and nickel alloy may be manufactured by cold rolling. In detail, the metal plate 10 may be formed through melting, forging, hot rolling, normalizing, primary cold rolling, primary annealing, secondary cold rolling, and secondary annealing processes, and may have a thickness of 30 μm or less. have. Alternatively, the thickness may be 30 μm or less through an additional thickness reduction process in addition to the above processes.

Meanwhile, the metal plate 10 may have a rectangular shape. In detail, the metal plate 10 may have a rectangular shape having a long axis and a short axis, and may have a thickness of about 30 μm or less.

As described above, the metal plate 10 may include an alloy metal including a plurality of metals such as iron and nigel.

The metal plate 10 may be formed by contacting a plurality of crystal grains constituting a plurality of metals.

The plurality of crystal grains may have different sizes. In detail, the plurality of crystal grains may have different areas. In addition, the plurality of crystal grains may have different particle sizes. In addition, the plurality of crystal grains may be formed in different shapes. In addition, as the plurality of crystal grains are formed in different shapes and sizes, the number of crystal grains per unit area may also be different.

The shape or sizes of these crystal grains may be related to the surface quality of the metal plate 10. When the deposition mask is manufactured using the metal plate 10, an etching process may be performed through an acidic etchant to remove impurities on the surface of the metal plate 10 before forming a through hole.

At this time, grooves with recessed surfaces may be formed on the surface of the metal plate 10 during the surface treatment process as crystal grains of different shapes or sizes are distributed for each surface of the metal plate 10. When these grooves are formed with pits, these pits may be a factor that degrades etching quality in a subsequent through-hole forming process.

In detail, there may be a first region in which crystal grains are densely gathered on each surface of the metal plate 10 and a second region in which crystal grains are not densely compared to the first region.

At this time, in the case of the second region, the etching rate during the surface treatment process is increased compared to the first region, so that more etching can be performed, and accordingly, pits and the like may be generated on the surface of the metal plate 10.

In order to solve the above problems, the metal plate according to the embodiment is intended to reduce the occurrence of pits due to uneven etching by controlling the area, particle size and size of the crystal grains forming the metal plate.

In detail, the metal plate according to the embodiment may control the area, particle size, and number of crystal grains per unit area of a plurality of crystal grains forming the metal plate.

Control grain area of metal plate

First, referring to FIGS. 8 and 9, it will be described that the surface pit is reduced by controlling the area of a plurality of crystal grains forming the metal plate 10 according to the embodiment.

On the other hand, Figures 2, 3 and 6 are pictures showing before and after the surface treatment of the metal plate according to the embodiment, Figures 4, 5 and 7 are the surface treatment of the metal plate according to the comparative example for comparison with the metal plate according to the embodiment These are drawings showing before and after pictures.

In the metal plate 10 according to the embodiment, the area of the plurality of crystal grains may be controlled to a constant size. Control of the area of the crystal grains may be controlled in a cold rolling process during the manufacturing process of the alloy metal plate.

At this time, the area of the crystal grains may be measured using an electron diffraction refraction equipment (EBSD). The size of the thick border regions of FIGS. 3 and 5 can be measured by the EBSD equipment to measure the area of each of the grains.

Referring to FIG. 8, the maximum area of crystal grains of the metal plate 10 according to the embodiment may be 700 μm ² or less, and the maximum area of 95% of the crystal grains of the entire metal plate may be 60 μm ² or less.

That is, the maximum area of the crystal grains measured in the entire area of the metal plate 10 may be 700 μm ² or less, and when the small grains of the entire grains are measured in the total area of the metal plate. The maximum area of the 95% crystal grain may be 60 µm ² or less.

In detail, the maximum area of the grains measured in the total area of the metal plate 10 is 660㎛ ² to 700㎛ can ^2, in detail, the maximum area of the grains measured in the entire area of the metal sheet 10 is ² to 680㎛ Can be 700㎛ ² ,

Meanwhile, referring to FIG. 9, the maximum area of the crystal grains of the metal plate 10 according to the comparative example may be 1500 μm ² or less, and the maximum area of 95% of the crystal grains of the entire metal plate may be 95 μm ² or less.

That is, the maximum area of the crystal grains measured in the total area of the metal plate 10 may be 1500 µm ² or less, and when the small grains of the entire grains in the total area of the metal plate are measured. The maximum area of the 95% crystal grain may be 95 μm ² or less.

In detail, the maximum, minimum, and average sizes of crystal grains according to Examples and Comparative Examples are shown in Table 1.

Maximum value (㎛ ² ) Minimum armor (㎛ ² ) Average pack (㎛ ² ) Standard deviation (㎛ ² ) 95% cumulative (㎛ ² ) Example 676.10 0.43 12.5 36.9 59.36 Comparative example 1501.00 0.43 18.4 71.5 94.22

2, 3 and 6, in the case of the metal plate according to the embodiment, it can be seen that the number of pits generated on the surface of the metal plate after the surface treatment is small, and the size of the pits is small.

On the other hand, referring to FIGS. 4, 5 and 7, in the case of the metal plate according to the comparative example, the number of pits generated on the surface of the metal plate after the surface treatment is increased compared to the embodiment, and the size of the formed pits is also compared to the embodiment. You can see that it grows.

That is, referring to FIGS. 8 and 9, it can be seen that in the metal plate according to the comparative example, the number of pits can be rapidly increased from the region where the area of the crystal grains exceeds 700 μm ² , and the size of the pits is increased.

That is, it can be seen from FIG. 9 that the area where the area of the crystal grains exceeds 700 μm ² is an area where a large number of pits occur.

Metal grain Particle size  Control

Next, with reference to FIGS. 10 and 11, it will be described that the surface pit is reduced by controlling the particle diameter of a plurality of crystal grains forming the metal plate 10 according to the embodiment.

On the other hand, Figures 2, 3 and 6 are pictures showing before and after the surface treatment of the metal plate according to the embodiment, Figures 4, 5 and 7 are the surface treatment of the metal plate according to the comparative example for comparison with the metal plate according to the embodiment These are drawings showing before and after pictures.

In the metal plate 10 according to the embodiment, the particle diameters of the plurality of crystal grains may be controlled to a constant size. Control of the diameter of the crystal grains can be controlled in a cold rolling process during the manufacturing process of the alloy metal plate.

At this time, the grain size of the crystal grains may be measured indirectly through the area of the crystal grains described above. In detail, the area of the crystal grains can be measured by measuring the size of the thick border regions of FIGS. 3 and 5 using an electron backscattered diffraction (EBSD) device.

In addition, the particle size of the crystal grains can be measured through the following formula.

[Equation]

In detail, the maximum, minimum, and average sizes of crystal grains according to Examples and Comparative Examples are shown in Table 2.

Maximum value (㎛) Minimum value (㎛) Average value (㎛) Standard deviation (㎛) 95% cumulative (㎛) Example 29.34 0.74 2.7 3.0 8.89 Comparative example 43.71 0.74 2.8 4.0 11.18

Referring to FIG. 10, the maximum grain size of the crystal grains of the metal plate 10 according to the embodiment may be 30 μm or less, and the maximum grain size of 95% of the crystal grains of the entire metal plate may be 9 μm or less.

That is, when the maximum grain diameter of the crystal grains measured in the entire area of the metal plate 10 may be 30 μm or less, and when the grain size of the total grains in the total area of the metal plate is measured from the smallest grain size. The maximum grain size of the 95% crystal grain may be 9 μm or less.

The maximum grain size of the crystal grains measured in the entire area of the metal plate 10 may be 25 μm to 30 μm. More specifically, the maximum grain size of the crystal grains measured in the entire area of the metal plate 10 may be 26 μm to 29 μm. ,

On the other hand, referring to Figure 11, the maximum grain size of the crystal grains of the metal plate 10 according to the comparative example is less than or equal to 44㎛, the maximum grain diameter of 95% of the grains of the total metal plate may be less than 11㎛.

That is, when the maximum grain size of the crystal grains measured in the total area of the metal plate 10 may be 44 μm or less, and when the grain size of the total grains in the total area of the metal plate is measured from the smallest grain size. The maximum grain size of the 95% crystal grain may be 11 μm or less.

2, 3 and 6, in the case of the metal plate according to the embodiment, it can be seen that the number of pits generated on the surface of the metal plate after the surface treatment is small, and the size of the pits is small.

On the other hand, referring to FIGS. 4, 5 and 7, in the case of the metal plate according to the comparative example, the number of pits generated on the surface of the metal plate after the surface treatment is increased compared to the embodiment, and the size of the formed pits is also compared to the embodiment. You can see that it grows.

That is, referring to FIGS. 10 and 11, it can be seen that in the metal plate according to the comparative example, the number of pits can be rapidly increased from the region where the grain size of the crystal grain exceeds 30 μm, and the size of the pits is increased.

That is, it can be seen from FIG. 10 that the area where the grain size of the crystal grains exceeds 30 μm is an area where a large number of pits occur.

Control of grain size of metal plate per unit area

Subsequently, referring to FIG. 12, it will be described that the surface pit is reduced by controlling the amount per dimple area of a plurality of crystal grains forming the metal plate 10 according to the embodiment.

On the other hand, Figures 2, 3 and 6 are pictures showing before and after the surface treatment of the metal plate according to the embodiment, Figures 4, 5 and 7 are the surface treatment of the metal plate according to the comparative example for comparison with the metal plate according to the embodiment These are drawings showing before and after pictures.

The metal plate 10 according to the embodiment may be controlled to have a constant size per unit area of a plurality of crystal grains.

At this time, the quantity per unit area of the crystal grains is determined by measuring the number of total grains in an area of 300 μm * 300 μm on the surface of the entire metal plate, and then defining an area of 1 μm * 1 μm as a unit area, The number of was measured.

In detail, the total number of crystal grains according to Examples and Comparative Examples and the quantity per unit area are shown in Table 3.

Total grain size (ea) Quantity per unit area (ea / ㎛ ² ) Example 20000 ~ 21000 0.20 ~ 0.25 Comparative example 10000 ~ 13000 0.10 ~ 0.15

Referring to Table 3, it can be seen that the quantity per unit area of the crystal grains of the metal plate according to the embodiment is larger than the quantity per unit area of the crystal grains of the metal plate according to the comparative example.

That is, a large number of crystal grains per unit area may mean that a small number of crystal grains are distributed. That is, it can be seen that the crystal grains of the metal plate according to the embodiment have more small grains distributed than the crystal grains of the metal plate according to the comparative example.

2, 3 and 6, in the case of the metal plate according to the embodiment, it can be seen that the number of pits generated on the surface of the metal plate after the surface treatment is small, and the size of the pits is small.

On the other hand, referring to FIGS. 4, 5 and 7, in the case of the metal plate according to the comparative example, the number of pits generated on the surface of the metal plate after the surface treatment is increased compared to the embodiment, and the size of the formed pits is also compared to the embodiment. You can see that it grows.

That is, referring to FIG. 12, it can be seen that in the metal plate according to the comparative example, the larger the grain size of the crystal grain, the more the number of pits and the size of the pits.

The nickel and iron alloy metal plate according to the embodiment may control the area, particle size, and size of the crystal grains to reduce the number of pits generated after the surface treatment.

In detail, the maximum area of the crystal grains can be controlled to 700 µm ² or less, and the maximum grain size of the crystal grains can be controlled to 30 µm or less. In addition, the size of grains can be minimized to increase the number of grains per unit area.

That is, by controlling the maximum area and particle size of the crystal grains to a certain size or less, the grain density or density of the surface formed by the grains increases, and thus, the grooves of the surface generated during the etching process of the surface treatment, that is, Pit formation can be minimized.

Therefore, when manufacturing the marks for deposition using the metal plate, it is possible to uniformize characteristics such as particle diameter, shape, and depth of the through-holes formed in the metal plate, thereby improving the deposition efficiency of the deposition mask, Bad deposition can be prevented.

Meanwhile, the deposition mask 100 according to the embodiment may be manufactured from the above-described metal plate 10. Hereinafter, a deposition mask 100 according to an embodiment will be described with reference to the drawings.

13 to 15 are conceptual views illustrating a process of depositing an organic material on a substrate 300 using a deposition mask 100 according to an embodiment.

13 is a view showing an organic material deposition apparatus including a deposition mask 100 according to an embodiment, and FIG. 14 is a deposition mask 100 according to an embodiment being tensioned to be mounted on the mask frame 200 It is a drawing showing that. In addition, FIG. 15 is a diagram illustrating that a plurality of deposition patterns are formed on the substrate 300 through a plurality of through holes of the deposition mask 100.

13 to 15, the organic material deposition apparatus may include a deposition mask 100, a mask frame 200, a substrate 300, an organic material deposition container 400 and a vacuum chamber 500.

The deposition mask 100 may include metal. For example, the deposition mask 100 may have the same composition as the metal plate 10 described above. In detail, the deposition mask 100 may be an invar including iron (Fe) and nickel (Ni). More specifically, the deposition mask 100 includes iron (Fe) by about 63.5% by weight to about 64.5% by weight and nickel (Ni) by about 35.5% by weight to about 36.5% by weight of Invar (Invar). It can contain.

The deposition mask 100 may include an effective portion for deposition, and the effective portion may include a plurality of through holes TH. The deposition mask 100 may be a substrate for a deposition mask including a plurality of through holes TH. At this time, the through hole may be formed to correspond to a pattern to be formed on the substrate. The through-hole TH may be formed not only in an effective region located in the center of the effective portion, but also in an outer region located outside the effective portion and surrounding the effective region. The deposition mask 100 may include a non-effective portion other than the effective portion including a deposition region. The through hole may not be located in the ineffective portion

The mask frame 200 may include an opening. A plurality of through-holes of the deposition mask 100 may be disposed on a region corresponding to the opening. Accordingly, an organic material supplied to the organic material deposition container 400 may be deposited on the substrate 300. The deposition mask 100 may be disposed on the mask frame 200 and fixed. For example, the deposition mask 100 may be fixed by tensioning with a constant tensile force and welding the mask frame 200.

The deposition mask 100 may be stretched in opposite directions from an edge disposed at the outermost edge of the deposition mask 100. The deposition mask 100 may be pulled in a direction in which the one end of the deposition mask 100 and the other end opposite to the one end are opposite to each other in the longitudinal direction of the deposition mask 100. One end and the other end of the deposition mask 100 may be disposed parallel to each other.

One end of the deposition mask 100 may be any one of four end surfaces forming the outermost sides of the deposition mask 100. For example, the deposition mask 100 may be tensioned with a tensile force of about 0.1 kgf to about 2 kgf. In detail, the deposition mask 100 may be tensioned with a force of about 0.4 kgf to about 1.5 kgf. Accordingly, the stretched mask for deposition 100 may be mounted on the mask frame 200.

Subsequently, the deposition mask 100 may fix the deposition mask 100 to the mask frame 200 by welding an ineffective portion of the deposition mask 100. Next, a portion of the deposition mask 100 disposed outside the mask frame 200 may be removed by a method such as cutting.

The substrate 300 may be a substrate used for manufacturing a display device. For example, the substrate 300 may be a substrate 300 for depositing an organic material for an OLED pixel pattern. Red, green, and blue organic patterns may be formed on the substrate 300 to form a pixel having three primary colors of light. That is, an RGB pattern may be formed on the substrate 300. Although not illustrated in the drawing, a white organic pattern may be further formed on the substrate 300 in addition to the red, green, and blue organic pattern. That is, a WRGB pattern may be formed on the substrate 300.

The organic material deposition container 400 may be a crucible. An organic material may be disposed inside the crucible.

As the heat source and / or current is supplied to the crucible in the vacuum chamber 500, the organic material may be deposited on the substrate 100.

Referring to FIG. 15, the deposition mask 100 may include one surface 101 and the other surface 102 facing the first surface.

The one surface 101 of the deposition mask 100 may include a small surface hole V1, and the other surface 102 of the deposition mask 100 may include a large surface hole V2. The through hole TH may be communicated by a communication portion CA to which the boundary between the small face hole V1 and the large face hole V2 is connected.

The deposition mask 100 may include a first inner surface ES1 in the small surface hole V1. The deposition mask 100 may include a second inner surface ES2 in the large hole V2. The first inner surface ES1 in the small surface hole V1 and the second inner surface ES2 in the large surface hole V2 may communicate with each other to form a through hole. For example, the first inner surface ES1 in one small surface hole V1 may communicate with the second inner surface ES2 in one large surface hole V2 to form one through hole.

The width of the large face hole V2 may be greater than the width of the small face hole V1. At this time, the width of the small surface hole (V1) is measured on the one surface 101, the width of the large surface hole (V2) can be measured on the other surface (102).

The small hole V1 may be disposed toward the substrate 300. The small hole V1 may be disposed close to the substrate 300. Accordingly, the small hole V1 may have a shape corresponding to a deposition material, that is, a deposition pattern DP.

The face hole V2 may be disposed toward the organic material deposition container 400. Accordingly, the large-surface hole V2 can accommodate an organic material supplied from the organic material deposition container 400 at a wide width, and the small-surface hole V1 is smaller than the large-surface hole V2. A fine pattern can be quickly formed on the substrate 300.

16 is a plan view of a deposition mask 100 according to an embodiment. Referring to FIG. 6, the deposition mask 100 according to an embodiment may include a deposition area DA and a non-deposition area NDA.

The deposition area DA may be an area for forming a deposition pattern. The deposition area DA may include an effective portion for forming a deposition pattern. The deposition area DA may include a pattern area and a non-pattern area.

The pattern area may be an area including a small face hole V1, a large face hole V2, a through hole TH, and an island portion IS, and the non-patterned area is a small face hole V1, a large face hole V2 ), A region not including the through hole TH and the island portion IS. Here, the deposition area DA may include an effective part including an effective area and an outer area, which will be described later, and a non-effective part without deposition. Therefore, the effective portion may be the pattern region, and the non-effective portion may be the non-pattern region.

In addition, one deposition mask 100 may include a plurality of deposition regions DA. For example, the deposition area DA of the embodiment may include a plurality of effective parts capable of forming a plurality of deposition patterns. The effective part may include a plurality of effective areas AA1, AA2, and AA3.

The plurality of effective areas AA1, AA2, and AA3 may be disposed in a central area of the effective part. The plurality of effective areas AA1, AA2, and AA3 may include a first effective area AA1, a second effective area AA2, and a third effective area AA3. Here, one deposition area DA may be a first effective portion including a first effective area AA1 and a first outer area OA1 surrounding the first effective area AA1.

Also, one deposition area DA may be a second effective portion including a second effective area AA2 and a second outer area OA2 surrounding the second effective area AA2. In addition, one deposition area DA may be a third effective portion including a third effective area AA3 and a third outer area OA3 surrounding the third effective area AA3.

In the case of a small display device such as a smart phone, an effective part of any one of a plurality of deposition regions included in the deposition mask 100 may be for forming one display device. Accordingly, one deposition mask 100 may include a plurality of effective parts, and thus multiple display devices may be simultaneously formed. Therefore, the deposition mask 100 according to the embodiment may improve process efficiency.

Alternatively, in the case of a large display device such as a television, several effective parts included in one deposition mask 100 may be a part for forming one display device. At this time, the plurality of effective parts may be to prevent deformation due to the load of the mask.

The plurality of effective areas AA1, AA2, and AA3 may be spaced apart from each other. In detail, the plurality of effective areas AA1, AA2, and AA3 may be arranged spaced apart in the long axis direction of the deposition mask 100. The deposition area DA may include a plurality of separation areas IA1 and IA2 included in one deposition mask 100. Separation regions IA1 and IA2 may be disposed between adjacent effective portions.

The separation regions IA1 and IA2 may be spaced apart between a plurality of effective portions. For example, a first separation region is between the first outer region OA1 surrounding the first effective region AA1 and the second outer region OA2 surrounding the second effective region AA2. (IA1) may be deployed. In addition, a second separation region IA2 is between the second outer region OA2 surrounding the second effective region AA2 and the third outer region OA3 surrounding the third effective region AA3. It can be placed. That is, adjacent effective portions may be distinguished from each other by the separation regions IA1 and IA2, and one deposition mask 100 may support a plurality of effective portions.

The deposition mask 100 may include non-deposition regions NDA on both sides in the longitudinal direction of the deposition region DA. The deposition mask 100 according to an embodiment may include the non-deposition region NDA on both sides of the deposition region DA in the horizontal direction.

The non-deposition area NDA of the deposition mask 100 may be an area not involved in deposition. The non-deposition region NDA may include frame fixing regions FA1 and FA2 for fixing the deposition mask 100 to the mask frame 200. Also, the non-deposition area NDA may include grooves G1 and G2 and an open portion.

As described above, the deposition area DA may be an area for forming a deposition pattern, and the non-deposition area NDA may be an area not involved in deposition. At this time, a surface treatment layer different from the metal plate 10 material may be formed in the deposition region DA of the deposition mask 100, and a surface treatment layer may not be formed in the non-deposition region NDA. have.

Alternatively, a surface treatment layer different from the material of the metal plate 10 may be formed only on one surface 101 of the deposition mask 100 or the other surface 102 opposite to the one surface 101.

Alternatively, a surface treatment layer different from the material of the metal plate 10 may be formed only on a part of one surface of the deposition mask 100.

For example, one surface and / or the other surface of the deposition mask 100, and all and / or a part of the deposition mask 100 may include a surface treatment layer having an etch rate slower than that of the metal plate 10 material, Etch factor can be improved. Accordingly, the deposition mask 100 of the embodiment can form a through hole of a fine size with high efficiency.

In one example, the deposition mask 100 of the embodiment may have a resolution of 400 PPI or more. Specifically, the deposition mask 100 may form a deposition pattern having a high resolution of 500 PPI or higher with high efficiency.

Here, the surface treatment layer may include a material different from the material of the metal plate 10, or may mean that the composition of the same element includes a different metal material. In this regard, it will be described in more detail in the manufacturing process of the deposition mask described later.

The non-deposition area NDA may include grooves G1 and G2. For example, the non-deposition area NDA of the deposition mask 100 may include a first groove G1 on one side of the deposition area DA, and the one side of the deposition area DA. On the other side opposite to the second groove (G2) may be included.

The first groove G1 and the second groove G2 may be regions in which grooves are formed in a depth direction of the deposition mask 100. The first groove G1 and the second groove G2 may have a groove portion having a thickness of about 1/2 of the deposition mask, so that stress during dispersion of the deposition mask 100 can be dispersed. Further, the grooves G1 and G2 are preferably formed to be symmetrical in the X-axis direction or symmetrical in the Y-axis direction based on the center of the deposition mask 100. Through this, the tensile force in both directions can be uniformly controlled.

The grooves G1 and G2 may be formed in various shapes. The grooves G1 and G2 may include a semi-circular groove. The groove may be formed on at least one surface of one surface 101 of the deposition mask 100 and the other surface 102 opposite to the one surface 101. Preferably, the grooves G1 and G2 may be formed on one surface 101 corresponding to the small face hole V1.

Accordingly, the grooves G1 and G2 may be formed simultaneously with the small face hole V1, thereby improving process efficiency. In addition, the grooves G1 and G2 may disperse the stress that may occur due to the size difference between the large-sized holes V2. However, the embodiment is not limited thereto, and the grooves G1 and G2 may have a rectangular shape. For example, the first groove G1 and the second groove G2 may have a rectangular shape or a square shape. Accordingly, the deposition mask 100 can effectively disperse the stress.

Further, the grooves G1 and G2 may include a curved surface and a flat surface. A plane of the first groove G1 may be disposed adjacent to the first effective area AA1, and the plane may be disposed horizontally with a longitudinal end of the deposition mask 100. The curved surface of the first groove G1 may be convex toward one end in the longitudinal direction of the deposition mask 100. For example, the curved surface of the first groove G1 may be formed such that half of the vertical length of the deposition mask 100 corresponds to a semicircular radius.

In addition, a plane of the second groove G2 may be disposed adjacent to the third effective area AA3, and the plane may be disposed horizontally with a longitudinal end of the deposition mask 100. The curved surface of the second groove G2 may be convex toward the other end in the longitudinal direction of the deposition mask 100. For example, the curved surface of the second groove G2 may be formed such that a half point of the vertical length of the deposition mask 100 corresponds to a semicircular radius.

The grooves G1 and G2 may be formed at the same time when forming the small face hole V1 or the large face hole V2. Through this, process efficiency can be improved. In addition, grooves formed on one surface 101 and the other surface 102 of the deposition mask 100 may be formed to be offset from each other. Through this, the grooves G1 and G2 may not penetrate each other.

In addition, the deposition mask 100 according to the embodiment may include four half-etching portions. For example, the grooves G1 and G2 may include even numbers of grooves G1 and G2, thereby more effectively distributing stress.

In addition, the grooves G1 and G2 may be further formed in the ineffective portion UA of the deposition region DA. For example, a plurality of the grooves G1 and G2 may be dispersed in all or part of the ineffective portion UA in order to disperse the stress during the elongation of the deposition mask 100.

That is, the deposition mask 100 according to the embodiment may include a plurality of grooves. In detail, the deposition mask 100 according to an embodiment is illustrated as including grooves G1 and G2 only in the non-deposited area NDA, but is not limited thereto, and the deposition area DA and the non-deposited area NDA At least one region may further include a plurality of grooves. Accordingly, the stress of the deposition mask 100 can be uniformly distributed.

The non-deposition region NDA may include frame fixing regions FA1 and FA2 for fixing the deposition mask 100 to the mask frame 200. For example, a first frame fixing area FA1 may be included on one side of the deposition area DA, and a second frame fixing area FA2 may be provided on the other side opposite to the one side of the deposition area DA. It can contain. The first frame fixing area FA1 and the second frame fixing area FA2 may be areas fixed to the mask frame 200 by welding.

The frame fixing regions FA1 and FA2 may be disposed between the grooves G1 and G2 of the non-deposition region NDA and the effective portions of the deposition regions DA adjacent to the grooves G1 and G2.

For example, the first frame fixing area FA1 may include a first groove G1 of the non-deposition area NDA and a first effective area of the deposition area DA adjacent to the first groove G1 ( AA1) and the first effective portion including the first outer region OA1.

For example, the second frame fixing area FA2 includes a second groove G2 of the non-deposition area NDA and a third effective area of the deposition area DA adjacent to the second groove G2 ( AA3) and a third effective portion including the third outer region OA3. Accordingly, a plurality of deposition pattern portions can be fixed at the same time.

In addition, the deposition mask 100 may include semi-circular open portions at both ends of the horizontal direction X. The non-deposition region NDA of the deposition mask 100 may include one semi-circular open portion at both ends in a horizontal direction. For example, the non-deposition area NDA of the deposition mask 100 may include an open portion in which the center of the vertical direction Y is open on one side of the horizontal direction.

For example, the non-deposition region NDA of the deposition mask 100 may include an open portion in which the center of the vertical direction is opened on the other side opposite to the one side in the horizontal direction. That is, both ends of the deposition mask 100 may include an open portion at a point 1/2 of the length in the vertical direction. For example, both ends of the deposition mask 100 may be shaped like a horseshoe.

At this time, the curved surface of the open portion may face the grooves G1 and G2. Accordingly, the open portions located at both ends of the deposition mask 100 are separated from the first groove G1 or the second groove G2 and 1/2 of the vertical length of the deposition mask 100. May be the shortest.

In addition, the length d1 in the vertical direction of the first groove G1 or the second groove G2 may correspond to the length d2 in the vertical direction of the open portion. Accordingly, when the mask 100 for evaporation is stretched, stress can be evenly distributed, so that the wave deformation of the evaporation mask 100 can be reduced.

Therefore, the deposition mask 100 according to the embodiment may have a uniform through hole, and thus the deposition efficiency of the pattern may be improved. Preferably, the length d1 in the vertical direction of the first groove G1 or the second groove G2 may be from about 80% to about 200% of the length d2 in the vertical direction of the open portion (d1) : d2 = 0.8-2: 1).

The length d1 in the vertical direction of the first groove G1 or the second groove G2 may be about 90% to about 150% of the length d2 of the vertical direction of the open portion (d1: d2 = 0.9 ~ 1.5: 1).

The length d1 in the vertical direction of the first groove G1 or the second groove G2 may be from about 95% to about 110% of the length d2 in the vertical direction of the open portion (d1: d2 = 0.95 ~ 1.1: 1).

In addition, although not shown in the drawing, the grooves G1 and G2 may be further formed in the ineffective portion UA of the deposition region DA. In order to disperse the stress during the stretching of the deposition mask 100, the grooves may be distributed in a number or part of all or part of the ineffective portion UA.

Also, the grooves G1 and G2 may be formed in the frame fixing areas FA1 and FA2 and / or the peripheral areas of the frame fixing areas FA1 and FA2. Accordingly, the deposition mask 100 that is generated when the deposition mask 100 is fixed to the mask frame 200 and / or after the deposition mask 100 is fixed to the mask frame 200 is deposited. ) Can be uniformly distributed. Accordingly, the deposition mask 100 can be maintained to have a uniform through hole.

The deposition mask 100 may include a plurality of effective parts spaced apart in the longitudinal direction and non-effective parts (UA) other than the effective parts. In detail, the deposition area DA may include a plurality of effective parts and non-effective parts UA other than the effective parts.

The plurality of effective parts may include a first effective part, a second effective part, and a third effective part.

Also, the first effective part may include a first effective area AA1 and a first outer area OA1 surrounding the first effective area AA1. The second effective part may include a second effective area AA2 and a second outer area OA2 surrounding the second effective area AA2. The third effective part may include a third effective area AA3 and a third outer area OA3 surrounding the third effective area AA3.

The effective portion is a plurality of small holes V1 formed on one surface of the deposition mask 100, a plurality of face holes V2 formed on the other surface opposite to the one surface, the small face holes V1 and the face holes It may include a plurality of through-holes (TH) formed by the communication portion (CA) to which the boundary of (V2) is connected.

Further, the effective areas AA1, AA2, and AA3 may include an island portion IS supporting between the plurality of through holes TH.

The island portion IS may be positioned between adjacent through holes TH among the plurality of through holes TH. That is, regions other than the through-holes TH in the effective regions AA1, AA2, and AA3 of the deposition mask 100 may be island portions IS.

The island portion IS may mean a portion that is not etched on one side 101 or the other side 102 of the effective portion of the deposition mask 100. In detail, the island portion IS may be an etched region between the through hole and the through hole on the other surface 102 on which the large hole V2 of the effective portion of the deposition mask 100 is formed. Therefore, the island portion IS may be disposed parallel to one surface 101 of the deposition mask 100.

The island portion IS may be disposed on the same plane as the other surface 102 of the deposition mask 100. Accordingly, the island portion IS may have the same thickness as at least a portion of the non-effective portion UA on the other surface 102 of the deposition mask 100. In detail, the island portion IS may have the same thickness as the non-etched portion of the ineffective portion on the other surface 102 of the deposition mask 100. Accordingly, the deposition uniformity of the sub-pixels may be improved through the deposition mask 100.

Alternatively, the island portion IS may be disposed in a plane parallel to the other surface 102 of the deposition mask 100. Here, the parallel plane means that the non-etched deposition mask among the other surface 102 and the non-effective portion of the deposition mask 100 in which the island portion IS is disposed by an etching process around the island portion IS ( It may include that the height difference of the other surface 102 of 100) is ± 1㎛ or less.

The island portion (IS) may have a polygonal shape. Alternatively, the island portion IS may have a curved shape. That is, when viewed in a plan view from the other surface 102 of the deposition mask 100, the island portion IS may have a polygonal or curved shape.

For example, the upper surface of the island portion IS may have a polygonal or curved shape. That is, the island portion IS may have a polygonal or curved shape. The curved shape may mean a polygon having a plurality of sides and a cabinet, and at least one transition curve. For example, when viewed in a plane, the island portion IS includes a plurality of curves, and the curves may have a curved shape. That is, the upper surface of the island portion IS may have a polygonal shape or a curved shape by an etching process to form the large-surface hole V1.

The deposition mask 100 is disposed surrounding the effective areas AA1, AA2, and AA3, and includes outer areas OA1, OA2, and OA3 arranged outside the effective areas AA1, AA2, and AA3. can do. The effective area AA may be an inner area when connecting the outermost of the through-holes located at the outermost for depositing the organic material among the plurality of through-holes.

The ineffective portion UA may be an outer region when connecting the outer portions of the through-holes located on the outermost side for depositing an organic material among the plurality of through-holes. For example, the ineffective portion UA may be an outer region when connecting the outer portions of the through holes located at the outermost portion in the outer region OA.

The non-effective portion UA includes an effective region (AA1, AA2, AA3) of the deposition region DA, an area excluding the effective portion including the outer regions OA1, OA2, and OA3 surrounding the effective region and the non-deposition. This is the area NDA. The first effective area AA1 may be located in the first outer area OA1. The first effective area AA1 may include a plurality of through holes TH for forming a deposition material. The first outer region OA1 surrounding the outer edge of the first effective region AA1 may include a plurality of through holes.

For example, the plurality of through holes included in the first outer region OA1 is for reducing etching defects of the through holes TH located at the outermost portion of the first effective region AA1. Accordingly, the deposition mask 100 according to the embodiment can improve the uniformity of the plurality of through holes TH located in the effective areas AA1, AA2, and AA3, thereby improving the quality of the deposition pattern produced. Can be improved.

In addition, the shape of the through hole TH of the first effective region AA1 may correspond to the shape of the through hole of the first outer region OA1. Accordingly, uniformity of the through hole TH included in the first effective area AA1 may be improved.

For example, the shape of the through hole TH of the first effective region AA1 and the shape of the through hole of the first outer region OA1 may be circular. However, the embodiment is not limited thereto, and the through hole TH may have various shapes such as a diamond pattern and an oval pattern.

The second effective area AA2 may be located in the second outer area OA2. The second effective area AA2 may have a shape corresponding to the first effective area AA1. The second outer region OA2 may have a shape corresponding to the first outer region OA1.

The second outer region OA2 may further include two through holes in a horizontal direction and a vertical direction, respectively, from the through holes positioned at the outermost portions of the second effective region AA2. For example, in the second outer area OA2, two through holes may be arranged in a row in the horizontal direction at positions above and below the through holes located at the outermost sides of the second effective area AA2.

For example, in the second outer area OA2, two through holes may be arranged in a vertical direction, respectively, on the left and right sides of the through hole located at the outermost side of the second effective area AA2. The plurality of through holes included in the second outer region OA2 is for reducing etching defects of the through holes located at the outermost portion of the effective portion. Accordingly, the deposition mask according to the embodiment can improve the uniformity of a plurality of through holes located in the effective portion, thereby improving the quality of the deposition pattern produced.

The third effective area AA3 may be included in the third outer area OA3. The third effective area AA3 may include a plurality of through holes for forming a deposition material. The third outer region OA3 surrounding the outer edge of the third effective region AA3 may include a plurality of through holes.

The third effective area AA3 may have a shape corresponding to the first effective area AA1. The third outer region OA3 may have a shape corresponding to the first outer region OA1.

In addition, the through holes TH included in the effective regions AA1, AA2, and AA3 may have a shape partially corresponding to the through holes included in the outer regions OA1, OA2, and OA3. Illero, the through-holes included in the effective areas AA1, AA2, and AA3 may include different shapes from the through-holes located at the edge portions of the outer areas OA1, OA2, and OA3. Accordingly, the difference in stress according to the position of the deposition mask 100 can be adjusted.

17 is a plan view of an effective area of the deposition mask 100 according to the embodiment, and FIG. 18 is a view showing another plan view of the deposition mask according to the embodiment.

17 and 18 may be a plan view of any one of the first effective area AA1, the second effective area AA2, and the third effective area AA3 of the deposition mask 100 according to the embodiment. In addition, FIGS. 17 and 18 are for explaining the shape of the through-hole TH and the arrangement between the through-holes TH, and the deposition mask 100 according to the embodiment has a through-hole TH shown in the drawing. It is not limited to the number of.

Referring to FIGS. 17 and 18, the deposition mask 100 may include a plurality of through holes TH. At this time, the through-holes TH may be arranged in a line or staggered with each other depending on the direction. For example, the through holes TH may be arranged in a line in the vertical axis and the horizontal axis, and may be arranged in a line in the vertical axis or the horizontal axis.

Referring to FIGS. 17 and 18, the deposition mask 100 may include a plurality of through holes TH. In this case, the plurality of through holes TH may have a circular shape. In detail, the horizontal particle diameter Cx of the through hole TH and the vertical particle diameter Cy may correspond to each other.

The through holes TH may be arranged in a line according to the direction. For example, the through holes TH may be arranged in a line in the vertical axis and the horizontal axis.

In detail, the first through hole TH1 and the second through hole TH2 may be arranged in a line in the horizontal axis, and the third through hole TH1 and the fourth through hole TH4 may be arranged in line in the horizontal axis. have.

In addition, the first through hole TH1 and the third through hole TH3 may be arranged in a line in the vertical axis, and the second through hole TH2 and the fourth through hole TH4 may be arranged in line in the horizontal axis. have.

That is, when the through-holes TH are arranged in a line in the vertical axis and the horizontal axis, respectively, the island portion IS is positioned between two adjacent through-holes TH in the diagonal direction, which is a direction intersecting both the vertical axis and the horizontal axis. can do. That is, the island portion IS may be positioned between two adjacent through holes TH located diagonally to each other.

For example, the island portion IS may be disposed between the first through hole TH1 and the fourth through hole TH4. Also, an island portion IS may be disposed between the second through hole TH2 and the third through hole TH3. Island portions IS may be located in an inclination angle direction of about +45 degrees around and an inclination angle of about -45 degrees around each other based on the horizontal axis traversing two adjacent through holes. Here, the inclination angle direction of about ± 45 around may mean a diagonal direction between the horizontal axis and the vertical axis, and the inclination angle in the diagonal direction may be measured in the same plane of the horizontal axis and the vertical axis.

In addition, referring to FIG. 18, another deposition mask 100 according to an embodiment may include a plurality of through holes. At this time, the plurality of through holes may have an elliptical shape. In detail, the horizontal direction particle diameter Cx of the through hole TH and the vertical particle diameter Cy may be different from each other. For example, the particle diameter Cx in the horizontal direction of the through hole may be larger than the particle diameter Cy in the vertical direction. However, the embodiment is not limited thereto, and the through hole may be a rectangular shape, an octagonal shape, or a rounded octagonal shape.

The through holes TH may be arranged in a line in one of the vertical axis or the horizontal axis, and may be alternately arranged in the other axis.

In detail, the first through hole TH1 and the second through hole TH2 may be arranged in a line on the horizontal axis, and the third through hole TH1 and the fourth through hole TH4 may be the first through hole TH1. And the second through-hole TH2 and the longitudinal axis, respectively.

When the through-holes TH are arranged in a line in either the longitudinal or transverse axis, and are alternately arranged in the other direction, two adjacent through-holes TH1 in the other direction of the longitudinal or transverse axis An island portion (IS) may be located between TH2). Alternatively, the island portion IS may be positioned between the three through holes TH1, TH2, and TH3 positioned adjacent to each other. Of the three adjacent through-holes TH1, TH2, and TH3, two through-holes TH1, TH2 are through-holes arranged in a line, and the other through-hole TH3 is adjacent to a direction corresponding to the line-direction. In the position, it may mean a through hole that may be disposed in an area between the two through holes TH1 and TH2. An island portion IS may be disposed between the first through hole TH1, the second through hole TH2, and the third through hole TH3. Alternatively, the island portion IS may be disposed between the second through hole TH2, the third through hole TH3, and the fourth through hole TH4.

In addition, in the case of measuring a horizontal particle diameter (Cx) and a vertical particle diameter (Cy) of a reference hole, which is any one through hole, in the deposition mask 100 according to an embodiment, a through hole adjacent to the reference hole The deviation between each horizontal particle diameter (Cx) between the (TH) and the deviation between the vertical particle diameter (Cy) may be implemented in about 2% to about 10%. That is, when the size variation between adjacent holes of one reference hole is implemented from about 2% to about 10%, uniformity of deposition can be secured. For example, the size variation between the reference hole and the adjacent holes may be about 4% to about 9%.

For example, the size variation between the reference hole and the adjacent holes may be about 5% to about 7%. For example, the size variation between the reference hole and the adjacent holes may be about 2% to about 5%. When the size difference between the reference hole and the adjacent holes is less than about 2%, the rate of moire in the OLED panel after deposition may be increased. When the size difference between the reference hole and the adjacent holes exceeds about 10%, the incidence of color unevenness in the OLED panel after deposition may be increased. The average deviation of the through hole particle diameter may be ± 5㎛. For example, the average deviation of the through-hole particle diameter may be ± 3 μm. For example, the average deviation of the through-hole particle diameter may be ± 1 μm. According to an embodiment, as the size variation between the reference hole and the adjacent holes is within ± 3 μm, deposition efficiency can be improved.

The island portion IS of FIGS. 17 and 18 means an etched surface between the through holes TH on the other surface of the deposition mask 100 in which the large hole V2 of the effective area AA is formed. You can. In detail, the island portion IS is the other surface of the etched deposition mask 100 excluding the second inner surface ES2 and the through hole TH located in the large hole in the effective area AA of the deposition mask. Can be. The deposition mask 100 of the embodiment may be for high-resolution to ultra-high resolution OLED pixel deposition having a resolution of 400PPI or more, and in detail 400PPI to 800PPI or more.

For example, the deposition mask 100 of the embodiment may be for forming a deposition pattern having a high resolution of Full-HD (High Definition) having a resolution of 400 PPI or more. For example, the deposition mask 100 of the embodiment may be for depositing OLED pixels in which the number of pixels in the horizontal and vertical directions is 1920 * 1080 or more and 400PPI or more. That is, one effective area included in the deposition mask 100 of the embodiment may be for forming a pixel number of resolution 1920 * 1080 or more.

For example, the deposition mask 100 of the embodiment may be for forming a deposition pattern having a high resolution of QHD (Quad High Definition) having a resolution of 500 PPI or more. For example, the deposition mask 100 of the embodiment may be for depositing OLED pixels in which the number of pixels in the horizontal direction and the vertical direction is 2560 * 1440 or more, and 530 PPI or more. Through the deposition mask 100 of the embodiment, the number of pixels per inch may be 530 PPI or more based on a 5.5 inch OLED panel. That is, one effective area included in the deposition mask 100 of the embodiment may be for forming a number of pixels having a resolution of 2560 * 1440 or more.

For example, the deposition mask 100 of the embodiment may be for forming a deposition pattern having ultra-high resolution of UHD (Ultra High Definition) having a resolution of 700 PPI or more. For example, the deposition mask 100 of the embodiment forms a deposition pattern having a resolution of UHD (Ultra High Definition) class for deposition of OLED pixels having a pixel count in the horizontal direction and the vertical direction of 3840 * 2160 or more, and 794 PPI or more. It may be to do.

The particle diameter of the through hole TH may be a width between the communication parts CA. In detail, the particle diameter of the through hole TH can be measured at the point where the end of the etching surface in the small face hole V1 meets the end of the etching face in the large face hole V2. The direction of measurement of the particle diameter of the through hole TH may be any one of a horizontal direction, a vertical direction, and a diagonal direction. The particle diameter of the through hole TH measured in the horizontal direction may be 33 μm or less. Alternatively, the particle diameter of the through hole TH measured in the horizontal direction may be 33 μm or less. Alternatively, the particle diameter of the through hole TH may be an average value of values measured in horizontal, vertical, and diagonal directions, respectively.

Accordingly, the deposition mask 100 according to the embodiment may implement QHD-level resolution. For example, the particle diameter of the through hole TH may be about 15 μm to about 33 μm. For example, the particle diameter of the through hole TH may be about 19 μm to about 33 μm. For example, the particle diameter of the through hole TH may be about 20 μm to about 27 μm. When the particle diameter of the through hole TH is greater than about 33 μm, it may be difficult to implement a resolution of 500 PPI or higher. On the other hand, when the particle diameter of the through hole TH is less than about 15 μm, deposition failure may occur.

Referring to FIGS. 17 and 18, a pitch between two adjacent through holes TH among a plurality of through holes in a horizontal direction may be about 48 μm or less. For example, a pitch between two adjacent through holes TH among a plurality of through holes TH in the horizontal direction may be about 20 μm to about 48 μm.

For example, a pitch between two adjacent through holes TH among the plurality of through holes TH in the horizontal direction may be about 30 μm to about 35 μm. Here, the distance may mean a distance P1 between the center of two adjacent first through holes TH1 and the center of the second through holes TH2 in the horizontal direction. Alternatively, the distance may mean a distance P2 between the center of two adjacent first island portions and the center of the second island portions in the horizontal direction. Here, the center of the island portion IS may be a center on an etched other surface between four adjacent through holes TH in the horizontal and vertical directions.

For example, the center of the island portion IS is adjacent to the first through hole TH1 in the vertical direction based on two first through holes TH1 and the second through hole TH2 adjacent in the horizontal direction. The horizontal axis connecting the edge of the island portion IS located in the area between the third through hole TH3 and the second through hole TH2 and the adjacent fourth through hole TH4 in the vertical direction and the vertical axis connecting the edge This can mean the intersection point.

In addition, referring to FIGS. 17 and 18, a pitch between two adjacent through holes TH among a plurality of through holes in a horizontal direction may be about 48 μm or less. For example, a pitch between two adjacent through holes TH among a plurality of through holes TH in the horizontal direction may be about 20 μm to about 48 μm.

For example, a pitch between two adjacent through holes TH among the plurality of through holes TH in the horizontal direction may be about 30 μm to about 35 μm. Here, the distance may mean a distance P1 between the center of two adjacent first through holes TH1 and the center of the second through holes TH2 in the horizontal direction.

In addition, the distance may mean a distance P2 between the center of two adjacent first island portions and the center of the second island portions in the horizontal direction. Here, the center of the island portion IS may be a center on an etched other surface between one through-hole and two adjacent through-holes in the vertical direction.

Alternatively, here, the center of the island portion IS may be the center on the other side of the etched surface between two through holes and one adjacent through hole in the vertical direction. That is, the center of the island portion IS is a center on the other side of the etched surface between three adjacent through-holes, and the three adjacent through-holes may mean that a triangular shape can be formed when the center is the center.

The direction of measurement of the particle diameter of the through-hole TH and the distance between two adjacent through-holes TH may be the same. The spacing of the through holes TH may be a measurement of the spacing between two adjacent through holes TH in the horizontal or vertical direction.

That is, the deposition mask 100 according to the embodiment may deposit an OLED pixel having a resolution of 400 PPI or more. In detail, the deposition mask 100 according to the embodiment has a resolution of 500 PPI or more as the particle size of the through hole TH is about 33 µm or less, and the pitch between the through holes TH is about 48 µm or less. OLED pixels can be deposited. In more detail, a green organic material having a resolution of 500 PPI or more may be deposited. That is, the QHD-level resolution may be implemented using the deposition mask 100 according to the embodiment.

The particle diameter of the through hole TH and the distance between the through holes TH may be a size for forming a green sub-pixel. For example, the particle diameter of the through hole TH can be measured based on the green (G) pattern. Since the green (G) pattern has a low recognition rate through vision, a larger number is required than the red (R) pattern and the blue (B) pattern, and the distance between the through holes (TH) is red (R) pattern and blue. (B) It may be narrower than the pattern. The deposition mask 100 may be an OLED deposition mask for realizing QHD display pixels.

For example, the deposition mask 100 may be for depositing at least one sub-pixel of red (R), first green (G1), blue (B), and second green (G2). In detail, the deposition mask 100 may be for depositing a red (R) sub-pixel. Alternatively, the deposition mask 100 may be for depositing a blue (B) sub-pixel. Alternatively, the deposition mask 100 may be for simultaneously forming a first green (G1) subpixel and a second green (G2) subpixel.

The pixel arrangement of the organic light emitting diode display may be arranged in the order of 'Red (R)-first green (G1)-blue (B)-second green (G2)'. In this case, the red (R) -first green (G1) may form one pixel RG, and the blue (B) -second green (G2) may form another pixel (BG). In the organic light emitting display device having such an arrangement, since the deposition interval of the green light emitting organic material is narrower than that of the red light emitting organic material and the blue light emitting organic material, a deposition mask 100 of the same type as the present invention may be required.

In addition, in the deposition mask 100 according to the embodiment, the particle diameter of the through hole TH may be about 20 μm or less in the horizontal direction. Accordingly, the deposition mask 100 according to the embodiment may implement UHD-level resolution. For example, the deposition mask 100 according to the embodiment has a resolution of 800 PPI as the particle size of the through hole TH is about 20 μm or less and the distance between the through holes is about 32 μm or less. OLED pixels can be deposited. That is, a UHD-class resolution may be implemented using a deposition mask according to an embodiment.

The particle size of the through hole and the distance between the through holes may be sized to form a green sub-pixel. The deposition mask may be an OLED deposition mask for realizing UHD display pixels.

FIG. 19 is a view showing each section overlapped in order to explain the height difference and size between the section in the A-A 'direction and the section in the B-B' direction of FIGS. 17 and 18.

First, the cross section in the A-A 'direction of FIGS. 17 and 18 will be described. The A-A 'direction is a cross section that crosses a central region between two first through holes TH1 and third through holes TH3 adjacent in the vertical direction. That is, the cross section in the A-A 'direction may not include the through hole TH.

In the cross-section in the A-A 'direction, an island portion IS, which is the other surface of the deposition mask that is not etched, may be positioned between the etched surface ES2 in the large hole and the etched surface ES2 in the large hole. Accordingly, the island portion IS may include a surface parallel to an unetched surface of the deposition mask. Alternatively, the island portion IS may include a surface that is the same as or parallel to the other surface of the deposition mask 100 that is not etched.

Next, the cross section in the B-B 'direction of FIGS. 17 and 18 will be described. The B-B 'direction is a cross section crossing the center of each of the two first through holes TH1 and the second through holes TH2 adjacent in the horizontal direction. That is, the cross section in the B-B 'direction may include a plurality of through holes TH.

One rib RB may be positioned between the adjacent third through hole TH3 and the fourth through hole TH4 in the B-B 'direction. Another rib RB may be positioned between the fourth through hole TH4 and the fourth through hole in the horizontal direction, but between the third through hole TH3 and the fifth through hole located in the opposite direction. One through hole TH may be located between the one rib and the other rib. That is, one through hole TH may be positioned between two adjacent ribs RB in the horizontal direction.

In addition, in the cross-section in the B-B 'direction, an etch surface ES2 in the large-aperture hole and a rib RB, which is an area where the etched surfaces ES2 in the adjacent large-aperture hole are connected to each other, may be located. Here, the rib (RB) may be an area in which the boundary between two adjacent large holes is connected. Since the rib RB is an etched surface, a thickness may be smaller than that of the island portion IS. For example, the width of the island portion IS may be about 2 μm or more. That is, a width in a direction parallel to the other surface of the portion remaining without being etched on the other surface may be about 2 μm or more. If the width of one end and the other end of the island portion (IS) is about 2 μm or more, the total volume of the deposition mask 100 may be increased. The deposition mask 100 having such a structure may ensure sufficient stiffness with respect to the tensile force imparted in the organic material deposition process, and may be advantageous for maintaining the uniformity of the through hole.

20 is a view showing a cross-sectional view in the direction B-B 'of FIG. 17 or FIG. 18. Referring to FIG. 10, a cross section of B-B 'of FIGS. 17 and 18 and a cross section of an enlarged through hole TH between the ribs RB and the ribs RB of the effective area according to FIG. do.

The deposition mask 100 according to the embodiment may have a different thickness in the effective area AA in which the through hole TH by etching is formed and in the non-etched non-effective portion UA. In detail, the thickness of the ribs RB may be smaller than the thickness of the non-etched non-effective portion UA.

In the deposition mask 100 according to the embodiment, the thickness of the non-effective portion UA may be greater than the thickness of the effective regions AA1, AA2, and AA3. In this case, the island portion IS is an etched region, and the island portion IS may correspond to the maximum thickness of the non-effective portion UA to the non-deposition region NDA. For example, the maximum thickness of the non-effective portion UA to the non-deposition region NDA of the deposition mask 100 may be about 30 μm or less. Accordingly, the maximum thickness of the island portion IS may be about 30 μm or less, and the thickness of the effective areas AA1, AA2, and AA3 excluding the island portion IS is greater than the thickness of the non-effective portion UA. It can be small. In detail, the maximum thickness of the non-effective portion UA to the non-deposition region NDA of the deposition mask 100 may be about 25 μm or less. For example, the deposition mask of the embodiment may have a maximum thickness of an ineffective region to a non-deposited region of about 15 μm to about 25 μm. Accordingly, the maximum thickness of the island portion IS may be about 15 μm to about 25 μm. When the maximum thickness of the ineffective region to the non-deposited region of the deposition mask according to the embodiment exceeds about 30 μm, since the thickness of the metal plate 10, which is the raw material of the deposition mask 100, becomes thicker, penetration of a fine size It may be difficult to form the hole TH. In addition, when the maximum thickness of the non-effective area UA to the non-deposition area NDA of the deposition mask 100 is less than about 15 μm, it may be difficult to form a through hole having a uniform size because the thickness of the metal plate is thin. .

The maximum thickness T3 measured at the center of the rib RB may be about 15 μm or less. For example, the maximum thickness T3 measured at the center of the rib RB may be about 7 μm to about 10 μm. For example, the maximum thickness T3 measured at the center of the rib RB may be about 6 μm to about 9 μm. When the maximum thickness T3 measured at the center of the rib RB exceeds about 15 μm, it may be difficult to form an OLED deposition pattern having a high resolution of 500 PPI or higher. In addition, when the maximum thickness T3 measured at the center of the rib RB is less than about 6 μm, uniform formation of the deposition pattern may be difficult.

The height H1 of the small hole of the deposition mask 100 may be about 0.2 times to about 0.4 times the maximum thickness T3 measured at the center of the rib RB. In one example, the maximum thickness T3 measured at the center of the rib RB is about 7 μm to about 9 μm, and the height H1 between one surface of the deposition mask 100 and the communicating portion is about 1.4. It may be from about ㎛ to about 3.5㎛. The height H1 of the small hole of the deposition mask 100 may be about 3.5 μm or less. For example, the height of the small hole V1 may be about 0.1 μm to about 3.4 μm. For example, the height of the small face hole V1 of the deposition mask 100 may be about 0.5 μm to about 3.2 μm. For example, the height of the small face hole V1 of the deposition mask 100 may be about 1 μm to about 3 μm. Here, the height may be measured in the thickness measurement direction of the deposition mask 100, that is, in the depth direction, and may be a height measured from one surface of the deposition mask 100 to the communicating portion. In detail, the horizontal direction (x direction) and vertical direction (y direction) described above in the plan views of FIGS. 10 to 14 may be measured in the z-axis direction forming 90 degrees.

When the height between the one surface of the deposition mask 100 and the communicating portion is greater than about 3.5 μm, deposition defects may occur due to a shadow effect in which the deposition material spreads to an area larger than the area of the through hole during OLED deposition. Can be.

In addition, the pore diameter (W2) in the communicating portion which is the boundary between the small diameter hole (V1) and the small surface hole (V1) and the large surface hole (V2) is formed on the one side where the small hole V1 of the deposition mask 100 is formed. They can be similar or different. The pore diameter W1 on one surface where the small face hole V1 of the deposition mask 100 is formed may be larger than the pore diameter W2 in the communication portion.

For example, the difference between the pore diameter W1 on one surface of the deposition mask 100 and the pore diameter W2 on the communication portion may be about 0.01 μm to about 1.1 μm. For example, the difference between the pore diameter W1 on one surface of the deposition mask and the pore diameter W2 on the communication portion may be about 0.03 μm to about 1.1 μm. For example, the difference between the pore diameter W1 on one surface of the deposition mask and the pore diameter W2 on the communication portion may be about 0.05 μm to about 1.1 μm.

When the difference between the pore diameter W1 on one surface of the deposition mask 100 and the pore diameter W2 on the communication portion is greater than about 1.1 μm, deposition defects due to a shadow effect may occur.

In addition, between the one end (E1) of the large surface hole (V2) and the small surface hole (V1) and the large surface hole (V2) located on the other surface (102) opposite to the one surface (101) of the deposition mask (100). It may have an inclination angle (θ1) connecting one end (E2) of the communication portion. For example, one end E1 of the face hole V2 may mean a point at which the rib RB, which is a boundary of the second inner surface ES2 in the face hole V2, is located. One end E2 of the communication part may mean an end of the through hole TH. The inclination angle θ1 connecting one end E1 of the face hole V2 and one end E2 of the communication part may be 40 to 55 degrees. Accordingly, it is possible to form a high-resolution deposition pattern of 400 PPI or higher, in detail 500 PPI or higher, and at the same time, an island portion IS may be present on the other surface 102 of the deposition mask 100.

Hereinafter, a method of manufacturing a deposition mask according to an embodiment will be described with reference to FIG. 21.

A method of manufacturing a mask for depositing a metal material for depositing an OLED pixel, the mask for deposition according to an embodiment includes a first step of preparing a base metal plate having a thickness of 20 μm to 30 μm; A patterned photoresist layer is disposed on one surface of the base metal plate, half-etched the open portion of the photoresist layer to form a groove on one surface of the base metal plate, and on the other surface opposite to the one surface of the base metal plate A second step of disposing a patterned photoresist layer on the surface and etching the open portion of the photoresist layer to form a through hole connected to a groove on one surface of the base metal plate; And removing the photoresist layer, to form a through hole formed by a large surface hole formed on one surface, a small surface hole formed on the other surface opposite to the one surface, and a communication portion connecting a boundary between the large surface hole and the small surface hole. And a third step of forming a mask for deposition, including. Through this, a deposition mask capable of realizing a resolution of 500 PPI or more can be manufactured.

A method of manufacturing a mask for depositing a metal material for depositing an OLED pixel, the mask for deposition according to an embodiment includes a first step of preparing a base metal plate having a thickness of 15 μm to 20 μm; A patterned photoresist layer is disposed on one surface of the base metal plate, half-etched the open portion of the photoresist layer to form a groove on one surface of the base metal plate, and on the other surface opposite to the one surface of the base metal plate A second step of disposing a patterned photoresist layer on the surface and etching the open portion of the photoresist layer to form a through hole connected to a groove on one surface of the base metal plate; And removing the photoresist layer, to form a through hole formed by a large surface hole formed on one surface, a small surface hole formed on the other surface opposite to the one surface, and a communication portion connecting a boundary between the large surface hole and the small surface hole. And a third step of forming a mask for deposition, including. Through this, it is possible to manufacture a deposition mask capable of realizing a resolution of 800 PPI or more.

First, a first step of preparing a base metal plate (BM) having a thickness of 20 μm to 30 μm will be described.

The base metal plate BM may include a metal material. The base metal plate (BM) may include a nickel alloy. For example, the base metal plate (BM) may be an alloy of nickel and iron. At this time, nickel may be from about 35% to about 37% by weight, and the iron may be from about 63% to about 65% by weight. For example, the base metal plate (BM) is about 35% to about 37% by weight of nickel, about 63% to about 65% by weight of iron, and trace amounts of C, Si, S, P, Cr, Mo, Mn, Ti, Co, Cu, Fe, Ag, Nb, V, In, and may include an Invar (Invar) containing at least one of Sb. Here, the trace amount may mean that it is 1% by weight or less. In detail, here, the trace amount may mean that it is 0.5% by weight or less. However, the base metal plate (BM) is not limited thereto, and of course, it may include various metal materials.

Since the nickel alloy such as the invar has a small thermal expansion coefficient, it has an advantage that the lifetime of the deposition mask can be increased.

Here, the first step may further include a thickness reduction step, depending on the thickness of the target base metal plate.

For example, the base metal plate (BM) may have a thickness of 25 μm to 30 μm. The base metal plate (BM) may have a thickness of 15 μm to 25 μm through a thickness reduction step by rolling and / or etching. Here, the etching may include electrical or chemical etching.

The base metal plate (BM) or the base metal plate (BM) having undergone a thickness reduction step may optionally include a surface treatment step.

For example, a nickel alloy such as Invar has a problem that uniform etching is difficult. That is, a nickel alloy such as Invar may have a high etching rate at the beginning of etching. Accordingly, there is a problem that the etching factor of the small surface hole may be lowered. When the etching factor of the small surface hole is lowered, there may be a problem that a deposition mask in which deposition defects are generated due to a shadow effect may be formed. Alternatively, the photoresist layer may be de-filmed due to side etching of the large surface hole. In addition, as the size of the through hole increases, it may be difficult to form a through hole having a fine size. In addition, the through-holes are formed non-uniformly, so that the production yield of the deposition mask can be reduced.

Therefore, the embodiment may arrange a surface treatment layer for surface modification having different components, contents, crystal structure, and corrosion rate on the surface of the base metal plate. Here, surface modification may mean a layer made of various materials disposed on a surface in order to improve an etching factor.

That is, the surface treatment layer may be a layer for preventing rapid etching on the surface of the base metal plate. The surface treatment layer may be an etch barrier layer having a slower etching rate than the base metal plate. The surface treatment layer may have a different crystal surface and crystal structure from the base metal layer. For example, as the surface treatment layer includes different elements from the base metal layer, a crystal surface and a crystal structure may be different from each other.

In the same corrosion environment, the surface treatment layer may have a different corrosion potential from the base metal plate. For example, when the same etching solution at the same temperature is treated for the same time, the surface treatment layer may have a different corrosion current or corrosion potential from the base metal plate.

The base metal plate (BM) may include a surface treatment layer or a surface treatment portion on one side and / or both sides, the whole and / or the effective area. The surface treatment layer to the surface treatment part may include different elements from the base metal plate, or a metal element having a slow corrosion rate in a larger content than the base metal plate.

For example, the surface treatment layer is nickel (Ni), chromium (Cr), iron (Fe), titanium (Ti), manganese (Mn), oxygen (O), molybdenum (Mo), silver (Ag), zinc (Zn), nitrogen (N), aluminum (Al) and may include at least one metal of alloys thereof, nickel (Ni), chromium (Cr), iron (Fe), titanium (Ti), manganese ( The metal content of at least one of Mn), oxygen (O), molybdenum (Mo), silver (Ag), zinc (Zn), nitrogen (N), aluminum (Al), and alloys thereof may be greater than that of the base metal plate .

When further including such a surface treatment step, a surface treatment layer may be disposed on the surface of the base metal plate according to the embodiment. In this surface treatment step, by disposing the surface treatment layer of different elements from the base metal plate BM, the corrosion rate on the surface may be slower than the raw material material of the base metal plate BM. Accordingly, the etching factor of the deposition mask according to the embodiment may be increased. In addition, as the deposition mask according to the embodiment can uniformly form a plurality of through holes, it is possible to improve the deposition efficiency of the R, G, and B patterns. Here, the inclusion of different elements may mean that the base metal plate (BM) and the surface treatment layer include at least one other element, or alloys having different contents even if all elements are the same.

Next, the step of disposing the patterned photoresist layer PR1 on one surface of the base metal plate will be described. In order to form a small surface hole, a patterned photoresist layer PR1 may be disposed on one surface of the base metal plate. The other surface opposite to one surface of the base metal plate may be provided with an etch-bottom layer such as a coating layer or a film layer to prevent etching.

Next, a second step of forming a groove on one surface of the metal plate by half etching the open portion of the photoresist layer PR1 will be described.

Since the open portion of the photoresist layer PR1 may be exposed to an etchant or the like, etching may occur in an open portion of the base metal plate where the photoresist layer PR1 is not disposed.

The second step may be a step of etching the base metal plate having a thickness of 20 μm to 30 μm (T1) until the thickness is about 1/2. The depth of the groove formed through the second step may be about 10㎛ to 15㎛. That is, the thickness T2 of the base metal plate measured at the center of the groove after the second step may be about 10 μm to 15 μm.

The second step can be anisotropic etching or a semi additive process (SAP). In detail, an anisotropic etching or semi-addition method may be used to half etch the open portion of the photoresist layer. Accordingly, the groove formed through the half etching may have an etching rate in the depth direction (b direction) faster than that of the side etching (a direction) than isotropic etching.

The etching factor of the small facet may be 2.0 to 3.0. For example, the etch factor of the small facet may be 2.1 to 3.0. For example, the etch factor of the small facet may be 2.2 to 3.0.

Here, the etching factor means the depth of the etched small hole (B) / width of the photoresist layer extending from the island portion on the small hole and protruding toward the center of the through hole (Etching Factor = B / A) Can be. The A represents an average value of the width of one side of the photoresist layer protruding on the one surface hole and the width of the other side opposite to the one side.

Next, a step of forming a through hole will be described.

First, a patterned photoresist layer PR2 may be disposed on the other surface opposite to the one surface of the base metal plate. A patterned photoresist layer PR2 having an open portion may be disposed on the other surface opposite to the one surface of the base metal plate to form a large hole. An etch-bottom layer such as a coating layer or a film layer for preventing etching may be disposed on one surface of the base metal plate.

The open portion of the photoresist layer PR2 may be exposed to an etchant or the like, and etching may occur in an open portion of the other surface of the base metal plate where the photoresist layer P2 is not disposed. The other surface of the base metal plate may be etched by anisotropic etching or isotropic etching.

As the open portion of the photoresist layer is etched, a groove on one surface of the metal plate may be connected to a large surface hole to form a through hole.

The second step is 1) after disposing the photoresist layer PR1 patterned on one surface of the base metal plate and the photoresist layer PR2 patterned on the other surface of the base metal plate, 2 ) A through hole may be formed by simultaneously etching one surface and the other surface of the base metal plate.

Alternatively, the second step is 1) by disposing the patterned photoresist layer PR1 on one surface of the base metal plate, and 2) by half-etching the open portion of the photoresist layer PR1, one surface of the base metal plate After forming a groove only on the top, 3) after disposing the patterned photoresist layer PR2 on the other side of the base metal plate, 4) opening the photoresist layer PR2 on the other side of the base metal plate A through hole may be formed by etching a portion.

Alternatively, the second step is 1) by placing the patterned photoresist layer PR2 on the other surface of the base metal plate, 2) by etching the open portion of the photoresist layer PR2 on the other surface of the base metal plate After forming a face hole only, 3) after arranging the patterned photoresist layer PR1 on one surface of the base metal plate, 4) an open portion of the photoresist layer PR1 on one surface of the base metal plate Half-etching may be to form a through hole that is connected to the face hole.

Next, by removing the photoresist layer, the through-hole formed by the communication between the large hole formed on one surface, the small surface hole formed on the other surface opposite to the one surface, the boundary between the large surface hole and the small surface hole is connected The deposition mask may be formed through a third step of forming a deposition mask including holes.

The deposition mask 100 formed through the third step may include the same material as the base metal plate. For example, the deposition mask may include a material having the same composition as the base metal plate. For example, the island portion of the deposition mask may include the surface treatment layer described above.

The deposition mask formed through the third step may have a maximum thickness at the center of the rib smaller than the maximum thickness at the non-effective area without etching. For example, the maximum thickness at the center of the rib may be 15 μm. For example, the maximum thickness at the center of the rib may be less than 10 μm. However, the maximum thickness in the non-effective area of the deposition mask may be 20 μm to 30 μm. The maximum thickness in the non-effective area of the deposition mask may be the same as the thickness of the base metal plate prepared in the first step. Alternatively, the maximum thickness in the ineffective region of the deposition mask may be 15 μm to 25 μm after the thickness reduction step in the first step.

Referring to FIGS. 22 and 23, a deposition pattern formed by a deposition mask according to an embodiment will be described.

Referring to FIG. 22, in the deposition mask according to the embodiment, a height H1 between one surface of the deposition mask having a small hole and the communicating portion may be 3 μm or less. Accordingly, since the distance between one surface of the deposition screed and the substrate on which the deposition pattern is disposed may be close, deposition defects due to the shadow effect may be reduced.

Referring to FIG. 23, deposition defects in which different deposition materials are disposed in the same region may not occur in regions between two adjacent patterns among adjacent R, G, and B patterns. That is, the R, G, and B patterns according to the embodiment may minimize the shadow phenomenon that the deposition material spreads around the pattern. Accordingly, the deposition mask according to the embodiment may have a small pore height of 3 μm or less, thereby preventing defects in OLED pixel deposition.

Features, structures, effects, and the like described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like exemplified in each embodiment may be combined or modified for other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiments have been mainly described above, these are merely examples and do not limit the present invention, and those skilled in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be implemented by modification. And differences related to these modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

Claims (11)

In the iron (Fe) -nickel (Ni) alloy metal plate of the deposition mask for OLED pixel deposition,
The metal plate is formed by a plurality of crystal grains,
The maximum area of crystal grains measured in the total area of the metal plate is 700 µm ² or less. According to claim 1,
When measuring from a small grain among the total grains measured in the total area of the metal plate. An alloy metal plate having a maximum area of 95% crystal grains of 60 µm ² or less. According to claim 1,
The maximum grain diameter of the crystal grains measured in the total area of the metal plate is 30 µm or less. According to claim 3,
When measuring from a small grain among the total grains measured in the total area of the metal plate. An alloy metal plate having a maximum grain size of 95% of crystal grains of 9 µm or less. According to claim 1,
The quantity per unit area of the plurality of crystal grains is 0.20ea / ㎛ ² to 0.25ea / ㎛ ² alloy metal plate. In the iron (Fe) -nickel (Ni) alloy metal plate of the deposition mask for OLED pixel deposition,
The metal plate is formed by a plurality of crystal grains,
The quantity per unit area of the plurality of crystal grains is 0.20ea / ㎛ ² to 0.25ea / ㎛ ² alloy metal plate. In the deposition mask for OLED pixel deposition comprising an iron (Fe) -nickel (Ni) alloy metal plate,
The deposition mask
A deposition region and a non-deposition region other than the deposition region,
The deposition region includes a plurality of effective portions and non-effective portions other than the effective portion,
The effective portion,
A plurality of small surface holes formed on one surface of the alloy metal plate;
A plurality of face holes formed on the other surface opposite to one surface of the alloy metal plate;
A plurality of through holes communicating with the small face hole and the large face hole; And
It is formed on the other surface of the alloy metal plate, and includes an island portion located between the through-holes,
The alloy metal plate is formed by a plurality of crystal grains,
The maximum area of crystal grains measured in the total area of the alloy metal plate is 700 μm ² or less. The method of claim 7,
When measuring from a small grain among the total grains measured in the total area of the metal plate. A deposition mask having a maximum area of 95% crystal grains of 60 µm ² or less. The method of claim 7,
When measuring from a small grain among the total grains measured in the total area of the metal plate. A deposition mask having a maximum grain size of 95% of the crystal grains of 9 µm or less. The method of claim 9,
When measuring from a small grain among the total grains measured in the total area of the metal plate. A deposition mask having a maximum grain size of 95% of the crystal grains of 9 µm or less. According to claim 1,
The number of crystal grains per unit area is 0.20ea / µm ² to 0.25ea / µm ^{2 The} deposition mask.

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