KR20020022281A - Full color organic electroluminescence display panel and fabricating mehtod for the same - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a full color organic EL display panel and a method of manufacturing the same, wherein a full color organic EL display panel includes first, second, and second positions at positions where a plurality of first electrodes and a second electrode cross each other perpendicularly. The third light emitting pixels are arranged to face each other in a diagonal direction with different areas according to respective light emitting efficiencies, thereby improving the color sense and opening ratio to increase the efficiency of the device by widening the light emitting area of the light emitting pixels having low light emitting efficiency.

Description

FULL COLOR ORGANIC ELECTROLUMINESCENCE DISPLAY PANEL AND FABRICATING MEHTOD FOR THE SAME}

The present invention relates to a method for producing a full color flat panel display panel using an organic EL device.

1A is a structural sectional view of a full-color organic EL display element.

In making an organic EL display element, the most efficient luminous efficiency among the methods for forming red, green, and blue light emitting pixels is to use a shadow mask as shown in Fig. 1A.

As a method of using the shadow mask 9 as described above, there are a strip method as shown in FIG. 1B and a method of arranging pixels in a delta type as shown in FIG. 1C.

As shown in FIG. 1A, the anode strips 2-1 and 2-2 are formed on the glass 1 and the insulating partition 7 is formed before the cathode is formed. Next, using the shadow mask 9 as shown in Figure 1a to form a red, green, blue emitting material layer (8-1, 8-2, 8-3), and then to form a cathode on the front In order to form the cathode 10 with a metal material.

However, the cell array structure of the full color organic EL device according to the related art described above has the following problems.

In the strip method and the method of arranging pixels in the delta type, red, green, and blue light emitting pixels have almost the same size, and thus, red color, which is relatively poor in luminance and luminous efficiency, does not appear properly. .

In addition, since the aperture ratio is low and the ito strip connecting the light emitting pixels is thin and long, the resistance is large, so that the uniformity of the entire screen is not good and the driving voltage is high.

Accordingly, the present invention has been made to solve the above-mentioned problems, and in order to compensate for the low luminance of red, the full color organic material improves the efficiency of the device by increasing the aperture ratio and improving the color by increasing the red light emitting area. An object thereof is to provide an EL display panel and a method of manufacturing the same.

Another object of the present invention is to provide a full-color organic EL display panel and a method of manufacturing the same, which reduce uniformity and drive voltage of the device by reducing the resistance by forming an auxiliary electrode having a low resistance in a predetermined region of the anode strip. have.

1A is a structural cross-sectional view of a full-color organic EL display element

1B is a structural plan view of an organic EL display element using a strip method according to the prior art

1C is a structural plan view of an organic EL display element using a method of arranging pixels in a delta type according to the prior art

2A to 2L are plan views of a full-color organic EL display device manufacturing process according to the present invention.

3 is a shadow mask

* Explanation of symbols for main parts of the drawings

1: Glass 2-1: Anode strip (light emitting pixel portion)

2-2: anode strip (light emitting pixel connection part)

2-3: unit emission pixel 2-4: subpixel

3-1: positive electrode tab 3-2: negative electrode tab

4: auxiliary electrode (light emitting pixel edge)

5: auxiliary electrode (light emitting pixel connection part)

6: insulation layer 7: insulation partition

8: red, green, blue common organic EL layer

8-1: red emitting material layer 8-2: green emitting material layer

8-3: blue emitting material layer 9: shadow mask

10 negative electrode 11 encapsulant

12: seal cover

A feature of the full-color organic EL display panel according to the present invention for achieving the above object is that the first, second, third light emission respectively formed at a position where a plurality of first electrodes and second electrodes are perpendicular to each other A full-color organic EL display panel having unit light emitting pixels composed of pixels, wherein the unit light emitting pixels have subpixels cut in a diagonal direction, and wherein the first, second, and third light emitting pixels differ according to respective luminous efficiency. It has an area and has a structure arranged in the subpixel.

The first light emitting pixel is positioned in a pair of subpixels facing each other in the diagonal direction among the unit light emitting pixels, and the second light emitting pixel and the third light emitting pixel are in a pair of other subpixels facing each other in the diagonal direction among the unit light emitting pixels. It is located at each pixel.

The first light emitting pixel has a lower luminous efficiency than the second and third light emitting pixels, and the first electrode is formed under each of the light emitting pixels and at a connection portion of the light emitting pixels.

And an auxiliary electrode formed on the first electrode formed at the connection portion of the light emitting pixel, and may be further formed at an edge portion of the light emitting pixel.

And an insulating layer formed in a non-light emitting area around the light emitting pixel, and further comprising an insulating partition wall formed between the second electrodes to electrically insulate the second electrodes.

And an encapsulation plate for encapsulating an organic EL layer formed on the first, second, and third light emitting pixels, and the encapsulation plate and the substrate in a non-light emitting region where the first, second, and third light emitting pixels are not formed. It is configured to further include a sealing material to adhere.

The first electrode is formed of a transparent electrode material as a lower electrode, and the second electrode is formed of a metal material as an upper electrode.

A feature of the full color organic EL display panel manufacturing method according to the present invention for achieving the above object is the first, second, second, respectively formed at a position where a plurality of first electrodes and second electrodes are perpendicular to each other A method for manufacturing a full color organic EL display panel having unit light emitting pixels consisting of three light emitting pixels, the method comprising: a first step of forming a first electrode having a predetermined polygonal shape connected to a band shape and having a repeated pattern on a substrate; A second step of forming an insulating partition between the unit light emitting pixels adjacent to the first electrode in a direction perpendicular to the first electrode, and an organic EL layer emitting light corresponding to each of the light emitting pixels. A third step of forming a pixel, and a fourth step of forming an electrode material on the entire surface including the organic EL layer to form the second electrode between the insulating barrier ribs. Over there makin it has done.

The first step may further include forming a first electrode formed on the light emitting pixel connection portion and an auxiliary electrode having a lower resistance than the first electrode on the first electrode formed on an edge portion of the light emitting pixel.

The first step further includes the step of forming an insulating layer formed in the non-light emitting region which is the periphery of each light emitting pixel.

According to an aspect of the present invention, the luminance of the light emitting pixels is relatively good by forming an array of a plurality of unit light emitting pixels having a subpixel having a diagonal structure differently according to the light emitting efficiency of the light emitting pixels in red, green, and blue colors. The red light emission efficiency can be increased and the aperture ratio can be increased.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

A preferred embodiment of the full color organic EL display panel according to the present invention will be described with reference to the accompanying drawings.

2A to 2L are plan views of a full-color organic EL display device manufacturing process according to the present invention.

First, as shown in FIG. 2A, patterns of anode strips 2-1 and 2-2 are formed on the glass 1 by ito or other transparent electrodes. By patterning the anode strips 2-1 and 2-2 in the same manner as described above, the unit light emitting pixels 2-3 are divided in diagonal directions to subpixels 2-4 having four triangular shapes with smooth edges. It can be seen that it is configured. A light emitting pixel having a light emitting material layer emitting red, green, and blue light is formed in the unit light emitting pixel 2-3 including the subpixels 2-4.

A light emitting pixel is formed by forming a red light emitting material layer that later emits red light having a relatively low light emitting efficiency in a pair of subpixels 2-4 facing each other in the diagonal direction as described above. The other pair of pixels 2-4 facing in the diagonal direction forms a light emitting pixel emitting blue and green light by forming a blue and green light emitting material layer.

Subsequently, as shown in FIG. 2B, the auxiliary electrode 5 is formed to reduce the resistance of the anode strip 2-2 of the light emitting pixel connection portion.

Subsequently, as shown in FIG. 2C, when the auxiliary electrode 4 is formed at the edge of the light emitting pixel, the resistance may be further reduced than when only the anode strip 2-2 connecting each light emitting pixel is formed. Metals such as Cr, Al, Cu, W, Au, Ni, and Ag, which have relatively lower resistance than ito, are used as the auxiliary electrode 4 and 5 materials.

Next, as shown in FIG. 2D, the insulating layer 6 is formed to cover the positive electrode tab 3-1.

The red light emitting pixel may be divided in half using the insulating layer 6.

The insulating layer is formed in the non-light emitting region, which is the periphery of the light emitting pixel, including the anode step 3-1. The insulating layer 6 uses an insulator of an inorganic material and an organic material. In the case of inorganic materials, oxides and nitrides are used, and inorganic materials dissolved in a solvent in a spinable manner are also possible. In the case of the organic material, a polymer of a polymer is preferable, and photoresist, polyimide, and polyolefin are suitable.

Then, as shown in FIG. 2E, an insulating partition 7 is formed for insulation between the cathodes to be formed.

Subsequently, as shown in FIG. 2F, the red, green, and blue common organic EL layers 8 are deposited at once using a blank mask that can deposit all over the emission region.

Then, using the shadow mask 9 as shown in FIG. 3, a red emitting material layer 8-1, which is an organic EL layer that emits red light as shown in FIGS. 2G and 2H, is deposited. The light emitting pixel formed on the upper portion as shown in 2h may be formed by rotating the shadow mask 9 by 180 degrees. Alternatively, the upper and lower two triangular holes may be simultaneously formed using a mask.

Subsequently, the green and blue emitting material layers 8-2 and 8-, which are organic EL layers that emit green and blue colors as shown in FIGS. 2I and 2J using the shadow mask 9 in the same manner as the method of forming red color, are used. 3) is deposited. The shadow mask 9 is rotated or formed in each of the green and blue pixels using another mask.

The red, green, and blue common organic EL layers 8 can be formed on each of the red, green, and blue pixels by using one shadow mask 9 as shown in FIG. 3 without depositing the entire emission area. There is also.

Then, as shown in FIG. 2K, a metal material layer for forming the cathode strip 10 is formed of Mg-Ag alloy, Al, or other conductive material.

Subsequently, as shown in FIG. 2L, a protective film layer such as an oxygen adsorption layer, a moisture adsorption layer, and a moisture barrier layer is formed, and the encapsulation material is encapsulated using the encapsulant 11 and the encapsulation plate 12 to complete the device.

The full color organic EL display panel and the manufacturing method thereof according to the present invention as described above have the following effects.

First, in order to make up for the shortcomings of red, which is relatively inefficient in making full-color organic EL devices, red light emitting pixels are arranged larger than green and blue light emitting pixels to enhance red light emitting efficiency, thereby improving color. In addition, the aperture ratio is increased to increase the efficiency of the device.

Second, the uniformity and driving voltage of the device can be lowered as a whole by reducing the resistance by forming an auxiliary electrode having a low resistance in a predetermined region of the anode strip.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (13)

A full-color organic EL display panel having unit light emitting pixels each consisting of first, second, and third light emitting pixels respectively formed at positions where a plurality of first electrodes and second electrodes cross each other perpendicularly, The unit light emitting pixel has subpixels cut in a diagonal direction, and the first, second, and third light emitting pixels have different structures according to respective luminous efficiencies, and have a structure arranged in the subpixels. Color organic EL display panel. The method of claim 1, The first light emitting pixel is positioned in a pair of subpixels facing in the diagonal direction among the unit light emitting pixels, and the second light emitting pixel and the third light emitting pixel are in pairs of subpixels facing in the diagonal direction among the unit light emitting pixels. Full color organic EL display panel, characterized in that located in each. The method of claim 2, And the first light emitting pixel has a lower luminous efficiency than the second and third light emitting pixels. The method of claim 1, And the first electrode is formed under each of the light emitting pixels and at a connection portion of the light emitting pixels. The method of claim 4, wherein And an auxiliary electrode formed on the first electrode formed at the connection portion of each light emitting pixel. The method of claim 5, And the auxiliary electrode is further formed at an edge portion of the light emitting pixel. The method of claim 1, And an insulating layer formed in a non-light emitting area which is the periphery of the light emitting pixel. The full color organic EL display panel according to claim 1, further comprising an insulating partition formed between the second electrodes to electrically insulate the second electrodes. The method of claim 1, An encapsulation plate encapsulating an organic EL layer formed on the first, second, and third light emitting pixels; And an encapsulant for adhering the encapsulation plate and the substrate to a non-light emitting region where the first, second, and third light emitting pixels are not formed. The full color organic EL display panel according to claim 1, wherein the first electrode is formed of a transparent electrode material as a lower electrode, and the second electrode is formed of a metal material as an upper electrode. A method for manufacturing a full-color organic EL display panel having unit light emitting pixels each consisting of first, second, and third light emitting pixels respectively formed at positions where a plurality of first electrodes and second electrodes cross each other perpendicularly; A first step of forming a first electrode having a predetermined polygonal shape connected to a band shape and having a repeated pattern on the substrate; A second step of forming an insulating partition between the unit light emitting pixels adjacent in a direction perpendicular to the first electrode; A third step of forming an organic EL layer that emits light corresponding to each of the light emitting pixels in the first, second, and third light emitting pixels; And depositing an electrode material on the entire surface including the organic EL layer to form the second electrode between the insulating partition walls. 12. The method of claim 11, wherein the first step is And forming an auxiliary electrode having a lower resistance than the first electrode on the first electrode formed at the light emitting pixel connection part and the first electrode formed at the edge of the light emitting pixel. Organic EL Display Panel Manufacturing Method. 12. The method of claim 11, wherein the first step is And forming an insulating layer formed in the non-light emitting region which is the periphery of each light emitting pixel.