KR100830321B1 - Metal mask for deposition and the deposition method using it - Google Patents

Abstract

A metal mask for deposition and a method for depositing a pixel for a display device using the same are provided to simplify a deposition process without depositing an organic material stacked in a white pixel without additional deposition. A method for depositing a pixel for a display device using a metal mask for deposition includes the steps of: depositing a red(R) light emitting organic material by using a first metal mask with two slits corresponding to a red subpixel and a white subpixel of a panel for one unit for the mask; depositing a green(G) light emitting organic material by using a second metal mask with two slits corresponding to a green subpixel and a white subpixel of the panel for one unit for the mask: and depositing a blue(B) light emitting organic material by using a third metal mask with two slits corresponding to a blue subpixel and a white subpixel of the panel for one unit for the mask.

Description

Pixel deposition method for display device using metal mask for deposition and metal mask for deposition {Metal mask for deposition and the deposition method using it}

1 is a schematic view showing the entire surface of a general deposition metal mask.

2 is a schematic diagram illustrating one unit of three types of deposition metal masks corresponding to unit pixels according to an embodiment of the present invention.

FIG. 3 illustrates red (R), green (G), and blue (B) organics deposited on an organic light emitting display panel using three types of deposition metal masks according to one embodiment of the present invention. It is a section showing the process.

4 is a cross-sectional view illustrating a structure in which a red (R) organic, a green (G) organic, and a blue (B) organic are stacked to obtain an organic material stacked on a white (W) pixel according to an embodiment of the present invention.

5 is a schematic diagram illustrating a slit of a partition and three types of metal masks according to an embodiment of the present invention.

6 is a schematic diagram illustrating an organic light emitting diode (OLED) after an organic light emitting layer is deposited using a metal mask according to an embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating one unit of three types of deposition metal masks corresponding to unit pixels, according to another exemplary embodiment.

Explanation of symbols on the main parts of the drawings

10: deposition mask

10a: red (R) organic vapor deposition mask 10b: green (G) organic vapor deposition mask

10c: blue (B) organic vapor deposition mask

12a, 12b, 12c, 12d: mask slit

14: anode electrode 16: glass substrate 18: partition wall

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal mask for deposition, and the organic material laminated on the white (W) pixel can be formed by overlapping the red (R), green (G) and blue (B) organic materials. W) The present invention relates to a metal mask for simplifying the deposition process by simultaneously depositing organic materials stacked on a pixel with red (R), green (G), and blue (B) organics.

An organic light emitting diode (OLED) is a form in which a light emitting layer made of an organic material is formed between a cathode electrode and an anode electrode, and when a constant current flows through the cathode electrode and the anode electrode, light is emitted from the light emitting layer. The organic light emitting device has a high response time with a response speed of 1 ms or less, low power consumption, and no self-emission, so there is no problem in viewing angle, and thus it is advantageous as a moving image display medium regardless of the size of the device. In addition, low-temperature manufacturing is possible, and the manufacturing process is simple based on the existing semiconductor process technology has attracted attention as the next generation flat panel display device.

In addition, the organic light emitting device is classified into an active driving method (AM) and a passive driving method (PM) according to the driving method. The passive driving method is unsuitable for large display devices until now due to the problem of wiring resistance, power consumption, and driving voltage. The active driving method has lower power consumption than the passive driving method, the unit pixel forming process is simpler than the passive driving method, and has the advantage of manufacturing a high resolution panel.

The so-called white method is known as an example of using a conventional organic light emitting element to create a display element capable of full color display. The white method is a method in which white light is emitted from a white organic light emitting diode, the white light is filtered by a color filter, and the light emission colors of red (R), green (G), and blue (B) are realized.

Various attempts have been made to obtain the white light. Japanese Patent Application Laid-Open No. 2004-235168 discloses an organic electroluminescent device characterized by providing an organic electroluminescent device in which three colors of red, blue, and green are mixed to obtain white light emission. In 040856, a white organic electroluminescent device having a blue light emitting layer, a red light emitting layer, and a green light emitting layer is disclosed. The organic light emitting device is characterized in that the white light emitting device is disclosed, and Korean Patent Publication No. 2005-0028564 relates to the structure and manufacturing method of the white organic electroluminescent device, red (R), green (G And a high efficiency, high brightness white organic electroluminescent device having a structure in which an organic light emitting layer of three primary colors of blue (B) is laminated.

However, the prior patent document refers to a method of forming white light with a red (R), green (G), and blue (B) lamination structure, but this requires a separate process to obtain white light, which makes the process complicated. There is a costly problem.

In order to solve this problem, there is a need for a deposition metal mask capable of stacking organic materials on white (W) pixels when organic materials are deposited on red (R), green (G), and blue (B) pixels. do.

The present invention was devised to solve the above problems, and its object is to simplify the process when the organic material is deposited on a panel composed of red (R), green (G), blue (B), and white (W) pixels. To this end, it is to provide a deposition metal mask in which one unit of the mask corresponding to the unit pixel has two slits.

In order to achieve the above object, in the deposition metal mask according to the present invention, a panel in which red (R), green (G), blue (B), and white (W) subpixels constitute a unit pixel structure is deposited. The metal mask is characterized in that one unit of the mask corresponding to the unit pixel has two mask slits. The mask slit may have a rectangular shape, and the metal mask may be formed of a nickel-alloy material.

In the pixel deposition method for a display device using the deposition metal mask, a first unit having two slits corresponding to the red (R) subpixel and the white (W) subpixel of the panel is provided in one unit of the mask. Depositing a red (R) light emitting organic material on the panel using a metal mask; Depositing a green (G) light emitting organic material on the panel by using a second metal mask having two slits corresponding to the green (G) subpixel and the white (W) subpixel of the panel in one unit of the mask step; And depositing a blue (B) light emitting organic material on the panel by using a third metal mask having two slits corresponding to the blue (B) subpixel and the white (W) subpixel of the panel in one unit of the mask. It is configured to include. The display device is an organic light emitting display device.

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

FIG. 1 is a schematic view showing a front surface of a general deposition metal mask, and FIG. 2 is a schematic view showing one unit of three types of deposition metal masks corresponding to unit pixels according to an embodiment of the present invention.

As shown, the deposition metal mask according to the present embodiment may be provided in three forms. The red (R) organic vapor deposition mask 10a, the green (G) organic vapor deposition mask 10b, and the blue (B) organic vapor deposition mask 10c may be provided in three forms. The deposition masks 10a, 10b, and 10c may be a collection of portions corresponding to unit pixels (hereinafter, referred to as “one unit”). In one unit of the red (R) organic vapor deposition mask 10a, two slits 12a and 12d are arranged at regular intervals. One unit of the green (G) organic vapor deposition mask 10b includes two slits 12b and 12d disposed at a smaller interval than the interval between the one slits of the red (R) organic vapor deposition mask 10a. Equipped. One unit of the blue (B) organic vapor deposition mask 10c includes two slits 12c and 12d disposed at a smaller interval than the interval between the one slits of the green (G) organic vapor deposition mask 10b. Equipped.

FIG. 3 illustrates red (R), green (G), and blue (B) organics deposited on an organic light emitting display panel using three types of deposition metal masks according to one embodiment of the present invention. It is a section showing the process.

The red (R) organic material is deposited on the red (R) pixel area and the white (W) pixel area between the partition walls 18 through the slits 12a and 12d of the red (R) organic material deposition mask 10a. .

Similarly, through the slits 12b, 12c, and 12d of the green (G) organic vapor deposition mask 10b and the blue (B) organic vapor deposition mask 10c, the green (G) organic material and the blue (B) organic material are partitioned, respectively. Deposition is made between (18) on the green (G) pixel region, the blue (B) pixel region, and the white (W) pixel region.

Through the slits 12d of the red (R), green (G), and blue (B) organic material deposition masks 10a, 10b, and 10c, red (R) organics, green (G) organics, And blue (B) organic materials are sequentially stacked to form organic materials stacked on white (W) pixels. Therefore, the organic material may be deposited on the white (W) pixel simultaneously with the deposition of the red (R), green (G), and blue (B) organic materials without a separate process.

Unexplained reference numeral 14 is an anode electrode of the organic light emitting display device, and reference numeral 16 is a glass substrate.

4 is a cross-sectional view illustrating a structure in which a red (R) organic material, a green (G) organic material, and a blue (B) organic material are stacked to obtain an organic material stacked on a white (W) pixel according to an exemplary embodiment of the present invention. to be. The white (W) pixel may be obtained by using a red (R) organic deposition mask, a green (G) organic deposition mask, and a blue (B) organic deposition mask without using a separate mask. have. On the other hand, the order of red (R), blue (B), and green (G), not blue (B), red (R), And green (G) in order. By changing the order, organic matters stacked on the white (W) pixels can be obtained simultaneously with the deposition of red (R) organics, blue (B) organics, and green (G) organics.

5 is a schematic diagram illustrating a slit of a partition and three types of metal masks according to an embodiment of the present invention. By depositing slits 12a, 12b, 12c, and 12d between the partition wall 18 and the partition wall 18, red (R), green (G), blue (B), and white (W) pixels can be deposited. .

The metal mask uses a nickel-alloy material having a thickness of 0.1 mm or less. The metal mask may be manufactured by various methods. As an example, the photo etching may be performed according to a photo etching method. The photo etching method includes a front process of coating and drying a photoresist after cleaning a surface of a metal material, a photo mask and an exposure machine. Exposure process to pattern the desired shape on the photoresist, development process to wash off the unexposed part, dura-process and dry it, and after the development is completed, the photoresist is washed away and the metal material is exposed. After etching to form the final desired shape by corrosion with iron chloride), the remaining photosensitive liquid is peeled off and finally dried.

6 is a schematic diagram showing an organic light emitting device (OLED) after an organic light emitting layer is deposited using the metal mask of the present invention. By using the three types of masks 10a, 10b, and 10c, a panel having a red (R), green (G), blue (B), and white (W) unit pixel structure can be obtained. However, the deposition order of the subpixels constituting the unit pixel may be changed. For example, the order of red (R), green (G), blue (B), and white (W), but not red (R), blue (B), green (G), and white (W). Or in the order of green (G), blue (B), white (W), and red (R).

FIG. 7 is a schematic diagram illustrating one unit of three types of deposition metal masks corresponding to unit pixels, according to another exemplary embodiment. One unit of the red (R) organic vapor deposition mask 10a can be disposed as shown in the two slits 12a, 12d, and one unit of the green (G) organic vapor deposition mask 10b, blue ( B) One unit of the organic vapor deposition mask 10c and the slits 12b, 12c, and 12d can also be arranged as shown. Through the slits 12d, red (R) organics, green (G) organics, and blue (B) organics are sequentially stacked on each other to form organic materials stacked on the white (W) pixels.

On the other hand, the inventive concept and embodiments disclosed in the present invention may be used by those skilled in the art as a basis for modifying or designing to other structures for carrying out the same purposes of the present invention. In addition, such modifications or equivalent equivalent structures made by those skilled in the art may be variously changed, substituted, and changed without departing from the spirit or scope of the invention described in the claims. For example, the three types of deposition metal masks may be changed in order. Red (R), blue (B), and green (G) order or blue (B), red (R), and green, not a stack of red (R), green (G), and blue (B) order The change can be made in the order of (G). By changing the order, the organic material laminated on the white (W) pixel can be obtained simultaneously with the deposition of the red (R) organic material, the blue (B) organic material, and the green (G) organic material. In addition, the three types of deposition metal masks may be changed in slit positions, thereby forming a unit pixel structure having a shape other than the above-described embodiment.

As described above, according to the deposition metal mask according to the present invention, when organic materials are deposited on a panel composed of red (R), green (G), blue (B), and white (W) pixels, white (W) Organic materials deposited on the pixel can be deposited by stacking red (R), green (G), and blue (B) organic materials at the same time. There is no need to separately deposit organic materials stacked on the white (W) pixels, thereby simplifying the deposition process.

Claims (5)

delete delete delete In order to deposit a panel in which red (R), green (G), blue (B), and white (W) sub-pixels constitute a unit pixel structure, one unit of a mask corresponding to the unit pixel includes two mask slits. In the pixel deposition method for a display device using a deposition metal mask having, A red (R) light emitting organic material is deposited on the panel by using a first metal mask having two slits corresponding to the red (R) subpixel and the white (W) subpixel of the panel in one unit of the mask. Doing; Depositing a green (G) light emitting organic material on the panel by using a second metal mask having two slits corresponding to the green (G) subpixel and the white (W) subpixel of the panel in one unit of the mask step; And A blue (B) light emitting organic material is deposited on the panel by using a third metal mask having two slits corresponding to the blue (B) subpixel and the white (W) subpixel of the panel in one unit of the mask. A pixel deposition method for a display device using a deposition metal mask comprising a step. The pixel deposition method of claim 4, wherein the display device is an organic light emitting display device.

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