KR100282392B1 - full-colcor Organic Electroluminescent Device and method for fabricating the same - Google Patents

Abstract

The present invention relates to a full-color organic electroluminescence device and a method of manufacturing the same. A plurality of first electrode strips having a predetermined interval on a transparent substrate have a wide polygonal shape in a light emitting area, and other areas. Is formed in a narrow line shape, and electrically insulating barrier ribs having a predetermined interval in a direction perpendicular to the first electrode bands are formed in regions other than the light emitting region, and then light corresponding to each light emitting region using a shadow mask. Forming an organic electroluminescent layer emitting a. In addition, the electrode material is deposited on the entire surface including the organic light emitting layer to form a plurality of second electrode bands between the electrically insulating partition walls, and a protective film is formed on the front surface including the second electrode bands, thereby producing a shadow mask. And the manufacturing process is easy.

Description

Full-colcor Organic Electroluminescent Device and method for fabricating the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to display devices, and more particularly to a full-color organic electroluminescence device and a method of manufacturing the same.

Recently, as the size of the display device increases, the demand for a flat display device having less space occupancy is increasing. As one of the flat display devices, an electroluminescent device is attracting attention.

The electroluminescent device is largely divided into an inorganic electroluminescent device and an organic electroluminescent device according to the material used.

In general, an inorganic electroluminescent device is a device that emits light by applying a high electric field to a light emitting part, accelerating electrons in the high electric field, and colliding with the light emitting center to thereby excite the light emitting center.

In addition, the organic light emitting device is based on the exciton generated by combining electrons and holes injected by injecting electrons and holes from the electron injection electrode (cathode) and the hole injection electrode (anode) into the light emitting unit, respectively. It is a device that emits light when falling into a state.

Since the inorganic electroluminescent device having the above operating principle requires a high electric field, a high voltage of 100 to 200 V is required as a driving voltage, whereas the organic electroluminescent device can be driven at a low voltage of about 5 to 20 V. There is an advantage, and research is being actively conducted.

In addition, the organic light emitting display device has excellent characteristics such as wide viewing angle, high speed response and high contrast, so it can be used as a pixel of a graphic display, a TV image display or a surface light source. They are thin, light, and have good color, making them suitable for next-generation flat panel displays.

There are various ways to implement full-color in making such an organic electroluminescent device.

Among these methods, a method using dual color-filters and CCMs has a disadvantage in that a blue material having good efficiency is required and a rapid decrease as the luminous efficiency passes through a color changing area.

Among them, a method of making the most efficient full-color organic electroluminescent device is a method of separately depositing materials emitting respective RGB colors as shown in FIGS. 1A to 1D.

First, as shown in FIG. 1A, transparent first electrode 2 bands are formed on the transparent substrate 1, and the partition wall 3 is formed in advance to form a second electrode band thereon.

In addition, the red masking material 5 is used to jump over two barrier ribs 3 to form a red emitting material layer 4-1.

Subsequently, as shown in FIGS. 1B and 1C, as in the method of forming the red light emitting material layer 4-1, the green is moved by one space by one side using other shadow masks 5-1 and 5-2. The light emitting material layer 4-2 and the blue light emitting material layer 4-3 are formed.

As shown in FIG. 1D, a second electrode material is deposited on the entire surface to form a strip of the second electrode 6 in the emission region, thereby manufacturing a full-color organic light emitting diode.

The full-color organic light emitting diode and the method of manufacturing the same according to the prior art have the following problems.

As shown in FIG. 2, since the RGB three sub-pixels must be formed in a pixel in a rectangular shape, the size of the pattern is reduced. The process is complicated because it is difficult to make, and secondly, the width of the bulkhead is small, which makes it difficult to align the shadow mask on the bulkhead.

And thirdly, since RGB three sub-pixels are positioned side by side in a rectangular form, color has a disadvantage in implementing full color.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object thereof is to provide a full-color organic light emitting diode and a method of manufacturing the same, which can improve color sensitivity and can be easily and simply manufactured.

1A to 1D are cross-sectional views illustrating a manufacturing process of a full-color organic light emitting display device according to the related art.

2 is a view showing a full-color organic light emitting display device according to the prior art

3 is a view showing a full-color organic light emitting display device according to the present invention;

4 shows an arrangement structure of pixels according to the present invention.

5A to 5F are cross-sectional views illustrating a manufacturing process of a full-color organic light emitting diode device according to the present invention.

Explanation of symbols for main parts of the drawings

21: transparent substrate 22: first electrode

23: electrical insulation partition 24-1, 24-2, 24-3: organic light emitting layer

25: second electrode

A full-color organic electroluminescent device according to the present invention is characterized in that a full-color organic electroluminescent device having first, second and third light emitting regions respectively at positions where the first electrode bands and the second electrode bands cross each other perpendicularly. In the device, the first light emitting region and the second light emitting region are arranged on the same line, and the third light emitting region is arranged to be offset from the first and second light emitting regions between the first light emitting region and the second light emitting region. .

A full-color organic electroluminescent device manufacturing method according to the present invention is characterized in that a full-color organic electroluminescent device having a light emitting region at a position where the first electrode bands and the second electrode bands cross each other perpendicularly, on a transparent substrate. A first step of forming a plurality of first electrode bands having a predetermined interval so that the first electrode bands are wide in the light emitting area and narrow in the other area; A second step of forming electrically insulating barrier ribs having a thickness, a third step of forming an organic light emitting layer emitting light corresponding to each light emitting area by using a shadow mask, and depositing an electrode material on the entire surface including the organic light emitting layer A fourth step of forming a plurality of second electrode bands between the electrically insulating partition walls, and a fifth step of forming a protective film on the entire surface including the second electrode bands. There makin word.

The full-color organic light emitting diode and the method of manufacturing the same according to the present invention having the above characteristics will be described with reference to the accompanying drawings.

First, the concept of the present invention is to produce a pixel array in the form of a delta to improve the color and ease the manufacturing process.

3 is a view illustrating a full-color organic light emitting display device according to the present invention, unlike in the prior art, a polygon having three or more angles of three RGB sub-pixels in one pixel. Shaped, red-lit sub-pixels and blue-lit sub-pixels are arranged on the same line, green-lit sub-pixels are red-lit sub-pixels and blue-lit sub- pixels. It is arranged to shift between the pixels.

That is, these three RGB sub-pixels are arranged in a delta structure.

In addition, each electrically insulating partition wall is formed in a shape surrounding the respective sub-pixels.

Such a structure makes the size of the sub-pixel pattern larger than that of the related art, making it easy to manufacture a shadow mask, and it is easy to align the shadow mask so that the process reliability is high.

In addition, since the RGB three sub-pixels are arranged in a delta structure, colors are good for realizing full color.

In addition, in driving the device, as shown in FIG. 4, three lines of the anode, the first electrode, perform color-control, and two cathodes, the second electrode. The line only needs to be scanned.

5A through 5F are cross-sectional views illustrating a manufacturing process of a full-color organic light emitting display device according to the present invention. As shown in FIG. 5A, first, a first electrode 22 made of a transparent material on a transparent substrate 21 is illustrated. ) Strips are formed to have a predetermined interval.

At this time, the portion formed in the light emitting region of the first electrode 22 is formed in a polygonal shape having three or more angles, and the portion formed in the region not emitting light has a narrower line shape than the portion formed in the emitting region. It is formed to connect the first electrode 22 of the polygonal shape.

The first electrode 22 in the form of a line formed in the region that does not emit light and the first electrode 22 in the form of a polygon formed in the emission region may be formed of different materials.

In addition, the first electrode 22 formed in the emission region should be formed in a delta or triangle structure such as a, b, and c.

That is, the first and third bands of the first electrode 22 are positioned on the same line, and the second bands of the first electrode 22 are formed to be slightly shifted.

In order to easily remove the second electrode strips later, the short strips 22-1 of the same material as that of the first electrode 22 having a short length are formed in advance at the end portion of the second electrode strips. And at the same time form.

After forming the first electrode 22 bands as described above, the insulating layer 20 is formed on the first electrode 22 in the non-light emitting region.

The material used for the insulating layer 20 is a polymer or an inorganic material, and polyimide, oxides, and nitrides are particularly preferable.

The width B of the insulating layer 20 should be A ≦ B ≦ C and the length D should be D ≦ E as shown in FIG. 5A.

Subsequently, as illustrated in FIG. 5B, the strips of the electrically insulating partition walls 23 are formed in a direction perpendicular to the first electrodes 22 at regular intervals to electrically insulate the second electrode strips.

Here, the shape of the electrically insulating partition wall 23 is formed to surround the first electrode 22 of the light emitting region.

In addition, one electrically insulating barrier rib 23 may be formed of one or more sub-bands.

This is to make electrical insulation between the second electrodes more secure. When forming a plurality of sub-bands, a buffer layer must be used between the substrate 21 and the electrically insulating partition 23.

However, it is not necessary to use a buffer layer when only one strip of electrically insulating partition wall 23 is used.

And, as shown in Figure 5c, using the shadow mask (shadow mask) as shown in Figure 4, an organic electroluminescent layer 24-1 that emits red light (composed of a light emitting layer, an electron transport layer, a hole transport layer, etc.) 5D and 5E, the organic light emitting layer 24-2 emitting green light using another shadow mask and the organic light emitting layer emitting blue light using another shadow mask ( 24-3) is deposited.

At this time, the materials that are common among the organic light emitting layers emitting red, green, and blue light are deposited at a time by using a blank mask that can deposit the entire emission area without using a shadow mask. It is good.

In addition, the organic electroluminescent layer emitting red, green, and blue light has a triangular structure, and the organic electroluminescent layer emitting red, green, and blue light, which is repeated next to it, has an inverted triangular structure.

Subsequently, as shown in FIG. 5F, the second electrode 25 material made of any one of Mg-Ag alloy, Al, and other conductive materials is made wider than the entire light emitting region, and the preformed short band 22- The second electrode 25 bands are formed between the electrically insulating partitions 23 by being deposited to overlap 1).

Then, a protective film layer (oxygen adsorption layer, moisture adsorption layer, etc.) is formed thereon, and encapsulation is performed to complete the device.

In the full-color organic electroluminescent device and its manufacturing method according to the present invention has the following effects.

The device of the present invention has good color, and is easy to manufacture and manufacture a shadow mask.

Claims (11)

In a full-color organic electroluminescent device having first, second and third light emitting regions at positions where the bands of the first electrode and the bands of the second electrode cross each other perpendicularly, The first light emitting area and the second light emitting area are arranged on the same line, and the third light emitting area is arranged to be offset from the first and second light emitting areas between the first light emitting area and the second light emitting area. The first electrode is formed to have a wide width in the light emitting region and a narrow width in the non-light emitting region, and an insulating layer is formed on the non-light emitting region, and the second electrode strips are electrically insulated between the second electrodes. Full-color organic light emitting display device, characterized in that the insulating partitions are formed. The full-color organic light emitting diode of claim 1, wherein the first, second, and third light emitting areas emit one of red, green, and blue colors, and they emit different colors. device. The full-color organic light emitting diode of claim 1, wherein the first, second, and third light emitting regions have a polygonal or circular shape having three or more angles. The full-color organic light emitting diode of claim 1, wherein the wide portion and the narrow portion of the first electrode are formed of different materials or the same material. The full-color organic light emitting diode of claim 1, wherein the first electrode of each of the light emitting regions is a polygon or a circle having three or more angles. The full-color organic light emitting diode device of claim 1, wherein the first, second, and third light emitting regions have a delta structure. The full-color organic light emitting diode of claim 1, wherein the electrically insulating partition wall is formed in the same direction as the second electrode bands. The full-color organic light emitting diode of claim 1, wherein each of the electrically insulating partitions is formed only around each of the light emitting regions. The full-color organic light emitting diode device of claim 1, wherein one or more electrically insulating barrier ribs are formed between the second electrode strips. 10. The full-color organic light emitting diode device of claim 9, wherein a buffer layer is formed under the plurality of electrically insulating partition walls. In the full-color organic light emitting device having a light emitting region in a position where the first electrode bands and the second electrode bands perpendicularly cross each other, A first step of forming a plurality of first electrode bands having a predetermined interval on the transparent substrate so that the width is wide in the light emitting area and narrow in the non-light emitting area; A second step of forming an insulating layer on the first electrode of the non-light emitting area; A third step of forming electrically insulating barrier ribs having a predetermined interval in a direction perpendicular to the first electrode bands in a region other than the light emitting region; A fourth step of forming an organic light emitting layer that emits light corresponding to each of the light emitting regions by using a shadow mask; A fifth step of depositing an electrode material on the entire surface including the organic light emitting layer to form a plurality of second electrode bands between the electrically insulating partition walls; And a sixth step of forming a protective film on the entire surface including the second electrode strips.