KR101441388B1 - Organic Emitting Display Device - Google Patents

Abstract

The present invention relates to an organic light emitting device in which a scattering film is formed integrally with a substrate of an organic light emitting device, and a scattering film is formed by selectively patterning a pixel region or a non-pixel region, An organic electroluminescent layer formed corresponding to a plurality of pixel regions on the substrate; a first electrode and a second electrode located above and below the organic electroluminescent layer; And a scattering material pattern formed on a portion corresponding to the pixel regions or a portion corresponding to the pixel regions.

Organic light emitting device, light efficiency, scattering film, scattering

Description

[0001] The present invention relates to an organic light emitting display device,

The present invention relates to an organic light emitting device, and more particularly, to an organic light emitting device having a scattering film formed integrally with one substrate of an organic light emitting device and selectively forming a scattering film in a pixel region or non- Emitting device.

Since the organic electroluminescent device, which is one of the flat panel displays, is of a self-emission type, it has a better viewing angle and contrast than a liquid crystal display device and does not require a backlight, Do.

In addition, since it can be driven by DC low voltage, has a fast response speed, and is entirely solid, it is resistant to external impact, has a wide operating temperature range, and is especially advantageous in terms of manufacturing cost. Particularly, the manufacturing process of the organic electroluminescent device is very simple because the deposition and encapsulation equipment are all different from the liquid crystal display device and the PDP (Plasma Display Panel).

In addition, when the organic electroluminescent device is driven by an active matrix method having a thin film transistor as a switching element for each pixel, the same luminance is exhibited even when a low current is applied, so that the organic electroluminescent device has advantages of low power consumption, high definition and large size.

Such an organic electroluminescent device displays a video image by exciting a fluorescent material using carriers such as electrons and holes.

Meanwhile, a passive matrix type in which a separate thin film transistor is not provided is mainly used as a driving method of such an organic electroluminescent device.

However, since the passive matrix method has many limitations such as resolution, power consumption, and lifetime, active matrix organic electroluminescent devices for next generation display requiring high resolution and large screen are being researched and developed.

Meanwhile, the organic electroluminescent device is classified into a bottom emission type or a top emission type depending on where the light emitting layer is positioned on the upper and lower substrates. When the upper emission type is implemented as an active matrix type, the thin film transistor array is arranged on the lower substrate When the light emitting layer is placed on the upper substrate, this is called a dual plate organic electroluminescence device (DOD).

Hereinafter, a general dual plate organic electroluminescent device will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a conventional dual-plate organic electroluminescent device.

As shown in FIG. 1, a typical dual-plate organic electroluminescent device includes a first substrate 10, a second substrate 20, and a second substrate 20 opposed to each other with a predetermined gap therebetween. (E) formed on the second substrate, and a seal formed on the edges of the first and second substrates (10, 20). The thin film transistor array includes a thin film transistor Pattern 30 as shown in FIG. A connector 17 and a transparent electrode 16 for connecting the second electrode 25 and the thin film transistor TFT are formed on a subpixel basis to supply current to the organic electroluminescent diode E .

The organic electroluminescent diode E includes a first electrode 21 used as a common electrode, a second electrode separator 26 disposed at a boundary of each subpixel on the first electrode 132, The organic electroluminescent layers 22, 23 and 24 and the second electrode 25 are formed in a pattern in which the organic electroluminescent layers 22, 23 and 24 and the second electrode 25 are sequentially separated in the sub-pixel unit.

Here, the organic electroluminescent layer has a structure in which a first carrier transport layer 22, a light emitting layer 23, and a second carrier transport layer 24 are sequentially stacked, and the first and second carrier transport layers 22 And 24 serve to inject and transport electrons or holes into the light emitting layer 23. The light emitting layer 23 is formed of a light emitting layer 23,

The first and second carrier transporting layers 22 and 24 are determined depending on the arrangement structure of the anode and the cathode. For example, the light emitting layer 23 is selected from the polymer material, and the first electrode 22 is electrically connected to the anode the first electrode 21 and the first carrier transporting layer 22 adjacent to the first electrode 21 are formed by sequentially stacking a hole injecting layer and a hole transporting layer, And the second carrier transport layer 24 adjacent to the second electrode 25 has a structure in which an electron injection layer and an electron transport layer are sequentially stacked adjacent to the second electrode 25.

The first and second carrier transporting layers 22 and 24 and the light emitting layer 23 may be formed of a polymer material or a low molecular material. When the material is formed of a low molecular material, the first and second carrier transporting layers 22 and 24 and the light emitting layer 23 may be formed using a vacuum deposition method. In the case of forming, it is formed through the ink jet method.

Unlike the conventional spacer for a liquid crystal display device, the conductive spacer 17 is mainly intended to electrically connect two substrates to each other through a cell gap holding function. The conductive spacer 17 has a predetermined height in a predetermined three- Respectively.

Here, the thin film transistor (TFT) corresponds to a driving thin film transistor connected to the organic electroluminescent diode (E). The thin film transistor TFT includes a gate electrode 11 formed on a predetermined portion of the first substrate 10, a semiconductor layer 13 formed in a prism shape to cover the gate electrode 11, And source and drain electrodes 14a and 14b formed on both sides of the source / drain electrodes 14a and 14b. A gate insulating layer 12 is formed on the entire surface of the first substrate 10 between the gate electrode 11 and the semiconductor layer 13 and the gate insulating layer 12 is formed between the gate electrode 11 and the semiconductor layer 13, A protective film is further formed on the gate insulating film 12. At this time, the drain electrode 14b is electrically connected to the transparent electrode 16 formed on the passivation layer 15 through a hole provided in the passivation layer 15. Here, the upper side of the transparent electrode 16 is in contact with the conductive spacer 17.

The conductive spacer 17 electrically connects the drain electrode 14b of the thin film transistor T provided on the sub-pixel unit to the first substrate 10 and the second electrode 25 provided on the second substrate 20, The first and second substrates 10 and 20 serve to connect the sub pixels of the first and second substrates 10 and 20 in a one-to-one manner to pass current therethrough .

The metal forming the outside of the conductive spacer 17 is selected from a conductive material, preferably a metal material having low ductility and low ductility.

Here, the first electrode 21 is made of a transparent electrode material, and the second electrode 25 is made of a metal layer of a light shielding material.

Further, the spacing space between the first and second substrates 10 and 20 may be filled with an inert gas or an insulating liquid.

Although not shown in the drawings, the first substrate 10 further includes scan lines, signal lines and power supply lines spaced apart from each other by a predetermined distance, and storage capacitors.

The dual-plate organic electroluminescent device includes a first electrode 21 having a large resistivity and a lattice-shaped bus line. The first electrode 21 has a voltage value Thereby preventing degradation.

However, the conventional organic light emitting device has the following problems.

Generally, in the case of an organic light emitting device that performs display of the light emitting effect of a light emitting substance by an electric field, its light efficiency is as low as about 20% of the total light emitting. Therefore, a certain luminous efficiency is required for a predetermined display, and a material having a power consumption or a scattering effect may be used for this purpose.

However, there is a limit to the increase in power consumption, and there is also a risk of reducing the life of the product. However, in the case of the arrangement of the film having the scattering function, the scattering function rather causes a problem that the interval between the pixels is rather less clear, and thus, in recent years, Research is being conducted to improve the light efficiency through the scattering function.

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a method of manufacturing a light emitting device, comprising: forming a scattering film integrally with a substrate of an organic light emitting diode; and selectively patterning a scattering film in a pixel region or non- And an object of the present invention is to provide an organic light emitting device having improved light efficiency.

According to an aspect of the present invention, there is provided an organic light emitting display including a substrate defining a plurality of pixel regions spaced apart from each other, an organic electroluminescent layer formed corresponding to a plurality of pixel regions on the substrate, A scattering material pattern formed on the first electrode and the second electrode located above and below the light emitting layer and the scattering material pattern formed on a portion corresponding to the pixel regions or a portion corresponding to the pixel regions other than the pixel regions, Feature.

Here, the scattering material pattern is formed to have an elliptical cross section.

The shape of the scattering material pattern may be such that the amount of light spreading toward the image side at the time of outputting light is increased and the amount of light spreading toward the side is reduced.

At this time, the scattering material pattern may be a photocurable material including scattering particles. In this case, the scattering material pattern may be formed on the substrate below the organic electroluminescent layer.

Alternatively, the scattering material pattern may be patterned on a transparent base film, and the transparent base film outside the substrate may be formed on the light emission side.

According to another aspect of the present invention, there is provided an organic light emitting display device including a first substrate and a second substrate which are formed to face each other and define a plurality of pixel regions spaced apart from each other, A first electrode formed on the entire surface of the first substrate including the scattering material layer, and a second electrode formed on the second substrate, An organic electroluminescent layer formed on the first electrode corresponding to the pixel region, a second electrode formed on the barrier and the organic electroluminescent layer, and a connection pattern connecting the thin film transistor and the second electrode. This is characterized in that it is made.

Alternatively, the organic light emitting diode display of the present invention for achieving the same object may include a first substrate and a second substrate which define a plurality of pixel regions which are spaced apart from each other and which are opposed to each other, A first electrode formed on the entire surface of the first substrate including the scattering material layer, and a second electrode formed on the second substrate, An organic electroluminescent layer formed on the first electrode corresponding to the pixel region, a second electrode formed on the barrier rib and the organic electroluminescent layer, and a connection pattern connecting the thin film transistor and the second electrode, The present invention also provides another feature.

The organic light emitting display of the present invention has the following effects.

First, the scattering film can be formed so as to selectively pattern the material having a scattering function, so that the light efficiency can be improved without reducing the aperture. Therefore, the light efficiency can be improved without increasing the power consumption. The light efficiency can be improved to about 150% under the same internal structure conditions except for the scattering film.

Secondly, the patterning process is simple compared with the example using the resin black matrix layer material for the structure for preventing the boundary defect due to scattering by forming the scattering film by patterning the light scattering material.

Third, the light efficiency can be improved in the same internal structure without any additional power consumption, and as a result, stable operation and lifetime can be improved.

Hereinafter, the organic light emitting device of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view illustrating an organic light emitting display device having a scattering film applied thereto according to an embodiment of the present invention. FIG.

2, the OLED display 100 of the present invention includes first and second substrates 110 and 120 opposed to each other, a driver formed on one side of the first substrate 110, (Not shown) formed on a substrate 110, an organic electroluminescent layer on the second substrate 120, a first electrode (not shown) and a second electrode (not shown) formed on and under the organic electroluminescent layer, And a scattering film (200) formed on the back surface of the second substrate.

The organic light emitting display device of the present invention can be formed on the backside or inside of the substrate on which the light of the scattering film 200 is emitted.

Here, an example of forming the scattering film 200 will be described.

FIG. 3 is a plan view showing each pixel arrangement of the organic light emitting display according to the present invention, and FIG. 4 is a structural cross-sectional view taken along line I-I 'of FIG.

3 and 4, the organic electroluminescent layer formed on the second substrate 120 is formed to correspond to each pixel region on the matrix, and the color of R 122a, G 122b, and B 122c Of the light emitting layer.

At this time, the part other than the pixel areas includes the barrier ribs 123 to separate the pixel areas.

In this case, if the scattering film 200 is formed on the backside of the second substrate 120 as shown in FIG. 4, the light passes through the scattering film 200 and the light path spreads widely, However, as in the case of the area A, the light scattered at the boundary part between the pixel area and the pixel area has an effect of overlapping, and the color is diffused, and the observer perceives it as a smear. That is, the sharpness of the light is lowered and the image becomes blurred, which leads to deterioration of image quality.

FIG. 5 is a cross-sectional view showing a vertical structure when a light-shielding layer is included when the scattering film of FIG. 2 is formed.

5, when the scattering film 300 is formed to include the black matrix layer 310 corresponding to the boundary of each pixel region and the scattering material layer 320 is filled to correspond to the remaining region, There is a problem in that the aperture ratio is lowered by the area ratio occupied by the black matrix layer 310, and the scattering film is formed in a different manner.

6A and 6B are a plan view showing a scattering film of the organic light emitting display device according to the first embodiment of the present invention and sectional views of the scattering film taken along line II-II 'thereof.

6A and 6B, in the case of the OLED display device according to the first embodiment of the present invention, the scattering film 400 includes scattering particles on a transparent base film 401 so that a transparent photo-curable material is cured And a scattering pattern material layer 410 is patterned in each pixel region.

In this case, the shape of the scattering pattern material layer 410 is formed to have an elliptical cross section. The shape of the scattering material pattern can be changed if the structure has a structure capable of increasing the amount of light that spreads toward the image side at the time of outputting light and decreasing the amount of light spreading toward the side .

Each display region of the organic light emitting display device of Fig. 3 corresponds to the size of the organic electroluminescence layers 122a, 122b and 122c of each color and is formed on the substrate on the light output side corresponding to this region. For example, in a top emmision mode, the first substrate 110 is formed on the backside or inside of the second substrate 120, and when it is a bottom emission mode, Or formed on the inner side.

When the scattering film is formed inside each substrate, the transparent base film 401 may be omitted and the scattering pattern material layer 410 may be directly patterned on the substrate.

FIGS. 7A and 7B are a plan view showing a scattering film of an organic light emitting diode according to a second embodiment of the present invention, and sectional views of the scattering film taken along line III-III 'thereof.

7A and 7B, in the case of the organic light emitting display according to the second embodiment of the present invention, the scattering film 500 includes scattering particles on a transparent base film 501 to cure the transparent photo- And the scattering pattern material layer 510 is patterned corresponding to the boundary of the pixel region.

That is, each display region of the OLED display of FIG. 3 corresponds to a region excluding the organic EL layers 122a, 122b, and 122c of each color, and is formed on the substrate on the light output side corresponding to this region. For example, in a top emmision mode, the first substrate 110 is formed on the backside or inside of the second substrate 120, and when it is a bottom emission mode, Or formed on the inner side.

Similarly, when the scattering film is formed inside each substrate, the transparent base film 501 may be omitted and the scattering pattern material layer 510 may be directly patterned on the substrate.

In the first and second embodiments described above, the method of forming the scattering film is as follows.

First, a coating material comprising a liquid scattering particle and a liquid photo-curable material is prepared.

Next, the coating material is spin-coated on a substrate or a transparent base film.

Then, the coating material is exposed, developed, and baked to form a scattering pattern material layer so that the coating material remains in correspondence with the pixel region or the non-pixel region of the substrate.

When the scattering pattern material layer is formed on the transparent base film, the scattering pattern material layer is formed on the back side of the substrate so that the scattering pattern material layer corresponds to each pixel region or non-pixel region of the substrate, And a double-sided tape is bonded between the substrate and the transparent base film.

8A to 8C are cross-sectional views illustrating various embodiments of the organic light emitting display according to the present invention, which are different from the scattering film forming application example.

8A, when the organic light emitting display 100 is formed in a bottom emission manner, the light is emitted from the lower side of the organic light emitting display 100 The scattering film 610 is positioned on the lower side of the OLED display 100. [ In this case, the scattering film 610 may be formed on the back surface of the organic light emitting diode display 100 or may be formed together with the inner array structure. In either case, the scattering film 610 is located below the organic electroluminescent layer.

8B, when the organic light emitting device 100 is formed in a top emission manner, the light is emitted from the top of the organic light emitting display device 100. At this time, the scattering film 620 And is located on the upper side of the organic light emitting display device 100. [ In this case, it may be formed on the backside of the upper substrate of the organic light emitting display device or may be formed together with the inner substrate array component. In either case, the scattering film 620 is located above the organic electroluminescent layer.

8C shows a case where the organic light emitting display device is formed by a dual plate method. The organic light emitting display device includes first and second substrates 110 and 120 opposed to each other and a sealant 130 An example in which a scattering film 630 is formed inside a second substrate 120 including an organic electroluminescent layer in a structure in which the first and second substrates 120 and 130 are bonded together.

8A to 8C, the scattering films 610, 620, and 630 are shown as one film without patterning. However, when the scattering films 610, 620, and 630 are formed inside each substrate, they are patterned corresponding to pixel regions or non- It is possible.

9 is a cross-sectional view showing a form having a scattering film inside the organic light emitting display device of the present invention.

9 illustrates an example of a dual plate type organic light emitting device of FIG. 8C, in which a scattering pattern material layer 410 is patterned corresponding to each pixel region.

In more detail, the organic light emitting diode display of the present invention includes a first substrate 110, a second substrate 120, and a second substrate 120 facing each other with a predetermined gap therebetween. A thin film transistor array including a transistor (TFT) formed for each sub pixel (pixel region), an organic light emitting diode element E formed on the second substrate 120, And a seal pattern 130 formed on an edge of the base plate 120. A connector 117 and a transparent electrode 116 for connecting the second electrode 125 and the thin film transistor (TFT) in units of subpixels are provided for supplying current to the organic electroluminescent diode E, .

The organic electroluminescent diode E includes a first electrode 121 used as a common electrode, a second electrode separator 126 disposed at a boundary of each subpixel on the first electrode 121, Organic electroluminescent layers 122, 123 and 124, and a second electrode 125 are formed in a pattern in which the organic electroluminescent layers 122, 123 and 124 and the second electrode 125 are sequentially separated in subpixel units in the region inside the barrier ribs 126.

Here, the organic electroluminescent layer has a structure in which a first carrier transport layer 122, an organic electroluminescent layer 123, and a second carrier transport layer 124 are sequentially stacked, and the first and second carrier transport layers 122, The light emitting layers 122 and 124 serve to inject and transport electrons or holes into the light emitting layer 23. [

For example, the organic electroluminescent layer 123 is selected from a polymeric material, and the first electrode 121 and the second electrode 122 are disposed on the first and second carrier transporting layers 122 and 124, respectively. When the anode and the second electrode 124 are formed of a cathode, the first carrier transport layer 122 adjacent to the first electrode 121 is formed by sequentially stacking a hole injection layer and a hole transport layer And the second carrier transport layer 124 adjacent to the second electrode 125 has a structure in which an electron injection layer and an electron transport layer are sequentially stacked adjacent to the second electrode 125.

The first and second carrier transport layers 122 and 124 and the light emitting layer 123 may be formed of a polymer material or a low molecular material. When the material is formed of a low molecular material, the first and second carrier transport layers 122 and 124 and the light emitting layer 123 may be formed using a vacuum deposition method. In the case of forming, it is formed through the ink jet method.

Unlike a conventional spacer for a liquid crystal display device, the conductive spacer 117 is mainly intended to electrically connect two substrates rather than a cell gap holding function. The conductive spacer 117 has a predetermined height in a predetermined three- Respectively.

Here, the thin film transistor (TFT) corresponds to a driving thin film transistor connected to the organic electroluminescent diode (E). The thin film transistor TFT includes a gate electrode 111 formed on a predetermined portion of the first substrate 110, a semiconductor layer 113 formed in a prism shape to cover the gate electrode 111, And source / drain electrodes 114a and 114b formed on both sides of the source / drain electrodes 114a and 114b. A gate insulating layer 112 is formed on the entire surface of the first substrate 110 between the gate electrode 111 and the semiconductor layer 113. A gate insulating layer 112 is formed on the entire surface of the first substrate 110, A protective film is further formed on the gate insulating film 112. At this time, the drain electrode 114b is electrically connected to the transparent electrode 116 formed on the passivation layer 115 through a hole provided in the passivation layer 115. Here, the upper side of the transparent electrode 116 is in contact with the conductive spacer 117.

The conductive spacer 117 electrically connects the drain electrode 114b of the thin film transistor T provided on the sub-pixel unit to the first substrate 110 and the second electrode 125 provided on the second substrate 120, The first and second substrates 110 and 120 serve to connect the sub-pixels of the first and second substrates 110 and 120 in a one-to-one manner to allow current to pass therethrough .

The metal forming the outside of the conductive spacer 117 is preferably selected from a conductive material, preferably a metal material having low ductility and low ductility.

Here, the first electrode 121 is made of a transparent electrode material, and the second electrode 125 is made of a metal layer of a light-shielding material.

In addition, the spacing space between the first and second substrates 110 and 120 may be filled with an inert gas or an insulating liquid.

Although not shown in the drawings, the first substrate 110 further includes scan lines, signal lines and power supply lines spaced apart from each other by a predetermined distance, and storage capacitors.

9, the scattering pattern material layer 410 may be patterned to correspond to a position corresponding to the non-pixel region in a reverse phase as shown in FIG.

Here, the selection of whether to form the scattering patterned material layer 410 corresponding to the pixel region or the non-pixel region by patterning may be made by selecting the efficiency of the emitted light of the organic light emitting diode, the area of the pixel region (or the non-pixel region) .

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

1 is a cross-sectional view showing a general organic light emitting device

FIG. 2 is a perspective view showing an organic light emitting display device according to an embodiment of the present invention,

3 is a plan view showing each pixel arrangement of the organic light emitting display according to the present invention.

4 is a cross-sectional view taken along the line I-I 'in Fig. 3

FIG. 5 is a cross-sectional view showing a vertical structure when the light-shielding layer is included when the scattering film of FIG. 2 is formed

6A and 6B are a plan view showing a scattering film of the OLED display device according to the first embodiment of the present invention and sectional views taken along lines II to II '

7A and 7B are a plan view showing a scattering film of an organic light emitting diode according to a second embodiment of the present invention and sectional views of the scattering film taken along lines III to III '

8A to 8C are cross-sectional views illustrating various embodiments of the organic light emitting display according to the present invention,

9 is a cross-sectional view showing a form having a scattering film on the inner side of the organic light emitting display device of the present invention

Claims (8)

A substrate defining a plurality of pixel regions which are spaced apart from each other; An organic electroluminescent layer formed corresponding to a plurality of pixel regions on the substrate; A first electrode and a second electrode located above and below the organic electroluminescent layer; And And a scattering material pattern formed on a light output side, the scattering material pattern corresponding to a portion corresponding to the pixel regions and a portion corresponding to the pixel regions other than the pixel regions, Wherein the shape of the scattering material pattern is a structure that increases the amount of light that spreads upward when light is emitted and reduces the amount of light that spreads to the side. The method according to claim 1, Wherein the scattering material pattern is formed to have an elliptical cross-section. delete The method according to claim 1, Wherein the scattering material pattern is formed of a photocurable material including scattering particles. The method according to claim 1, Wherein the scattering material pattern is formed on the substrate below the organic electroluminescence layer. The method according to claim 1, Wherein the scattering material pattern is formed by patterning on a transparent base film, and the transparent base film is positioned on an outgoing side of light outside the substrate. A first substrate and a second substrate which define a plurality of pixel regions which are spaced apart from each other and which are formed to face each other; A thin film transistor formed on each of the pixel regions on the first substrate; A scattering material layer formed on the second substrate in correspondence with each pixel region; A first electrode formed on the entire surface of the first substrate including the scattering material layer; A plurality of barrier ribs formed separately from the pixel regions; An organic electroluminescent layer formed on the first electrode corresponding to the pixel region; A second electrode formed on the barrier rib and the organic electroluminescent layer; And And a connection pattern connecting the thin film transistor and the second electrode, Wherein the shape of the scattering material pattern is a structure that increases the amount of light that spreads upward when light is emitted and reduces the amount of light that spreads to the side. A first substrate and a second substrate which define a plurality of pixel regions which are spaced apart from each other and which are formed to face each other; A thin film transistor formed on each of the pixel regions on the first substrate; A scattering material layer formed on the second substrate so as to correspond to a region excluding the pixel region; A first electrode formed on the entire surface of the first substrate including the scattering material layer; A plurality of barrier ribs formed separately from the pixel regions; An organic electroluminescent layer formed on the first electrode corresponding to the pixel region; A second electrode formed on the barrier rib and the organic electroluminescent layer; And And a connection pattern connecting the thin film transistor and the second electrode.

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