KR20180049361A - Organic light emitting display device - Google Patents

Abstract

According to embodiments of the present invention, disclosed is an organic light emitting display device which comprises: a first electrode provided on each of a plurality of subpixels and including at least two regions with different thicknesses; an organic light emitting layer arranged on the first electrode; and a second electrode arranged on the organic light emitting layer. Therefore, a rate of change in a color viewing angle can be reduced.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

The present embodiments relate to an organic light emitting display.

2. Description of the Related Art [0002] As an information-oriented society develops, there have been various demands for a display device for displaying images. Recently, a liquid crystal display (LCD), a plasma display panel (PDP) Various display devices such as a display device (OLED: Organic Light Emitting Display Device, or organic light emitting display) have been utilized. Such various display apparatuses include display panels corresponding thereto.

Thin film transistors are formed in each pixel region of the display panel, and a specific pixel region in the display panel is controlled through the current flow of the thin film transistor. The thin film transistor is composed of a gate and a source / drain electrode.

The organic light emitting display includes an organic light emitting element. In the organic light emitting device, a light emitting layer is disposed between two different electrodes. When electrons generated in one electrode and holes generated in the other electrode are injected into the light emitting layer, injected electrons and holes are coupled to form an exciton, And the generated exciton emits light while falling from an excited state to a ground state to display an image.

On the other hand, the organic light emitting device may include at least one light emitting layer. In general, an organic light emitting device having a plurality of light emitting layers may include light emitting layers that emit light having different peak wavelengths. As described above, an organic light emitting device having a plurality of light emitting layers through a combination of light having different peak wavelengths can emit a specific color.

However, since the peak of the spectrum of the light emitted from the organic light emitting device varies depending on the viewer's viewing position of the organic light emitting display device, there is a problem that it is difficult to realize a uniform image due to a different color depending on the viewing position of the display device.

In order to solve the above-described problems, the embodiments of the present invention provide an OLED display capable of reducing the rate of change of the color viewing angle even when viewing the display device at various angles.

The OLED display according to the present embodiments includes a substrate divided into a plurality of sub-pixels. In addition, the organic light emitting display according to the present embodiments includes a first electrode provided in each of the plurality of subpixels and including at least two regions having different thicknesses. In addition, the organic light emitting display according to the present embodiments includes an organic light emitting layer disposed on the first electrode. In addition, the organic light emitting display according to the embodiments includes a second electrode disposed on the organic light emitting layer.

The organic light emitting display according to the present embodiment has the effect of reducing the change rate of the color viewing angle of the organic light emitting display device by having the first electrode of the organic light emitting device disposed in one light emitting region has a plurality of thicknesses.

1 is a plan view showing one subpixel in an organic light emitting display according to the present embodiments.
FIG. 2 is a schematic view illustrating an organic light emitting diode of an OLED display according to a first embodiment of the present invention. Referring to FIG.
3 is a cross-sectional view taken along the line AB in Fig.
4 is a graph showing a change in viewing angle according to the first electrode thickness of the organic light emitting device.
5 is a table showing percent change in viewing angle according to the first electrode thickness of the organic light emitting device.
6 is a graph showing a change in color viewing angle according to an area ratio of the first region to the second region of the first electrode of the organic light emitting device.
FIG. 7 is a table specifically showing a color viewing angle change rate according to an area ratio of the first region to the second region of the first electrode of the organic light emitting device.
8 is a schematic view illustrating an organic light emitting diode of an OLED display according to a second embodiment of the present invention.
9 is a schematic view illustrating organic light emitting devices of the organic light emitting display according to the third embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. However, it is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

1 is a plan view showing one subpixel in an organic light emitting display according to the present embodiments. 1, the organic light emitting diode display according to the first embodiment includes an active layer 102, a gate electrode 103, a data line DLm, and a data line DLm, which are disposed on a substrate 100, And a drain electrode 106b disposed apart from the source electrode 106a and the source electrode 106a.

The first electrode of the organic light emitting diode is in contact with the drain electrode 106b through the contact hole 170. Here, the first electrode may be an anode electrode of the organic light emitting diode.

A bank pattern 140 defining a light emitting region EA of the subpixel and a non-light emitting region is disposed above the first electrode. The region opened by the bank pattern 140 may be the light emitting region EA of the subpixel. The light emitting region EA is a region in which light is emitted by the organic light emitting element disposed in the subpixel.

On the other hand, the organic light emitting layer of the organic light emitting device may include at least one light emitting layer. Meanwhile, the organic light emitting device having a plurality of light emitting layers may include light emitting layers that emit light having different peak wavelengths. As described above, an organic light emitting device having a plurality of light emitting layers through a combination of light having different peak wavelengths can emit a specific color.

However, since the peak of the spectrum of the light emitted from the organic light emitting diode varies depending on the viewing position of the organic light emitting display device, the color viewing angle varies depending on the viewing position, which makes it difficult to realize a uniform image.

In order to solve this problem, the organic light emitting display according to the present embodiments can have different thicknesses of the first electrodes disposed in one subpixel. This configuration will be described with reference to FIG.

FIG. 2 is a schematic view illustrating an organic light emitting diode of an OLED display according to a first embodiment of the present invention. Referring to FIG. 2, an organic light emitting device EL according to the first embodiment includes a first electrode 130 disposed on a substrate 100, an organic light emitting layer 150 disposed on the first electrode 130, And a second electrode 160 disposed on the organic light emitting layer 150.

In this case, the first electrode 130 may be divided into the first region 131 and the second region 132 in the light emitting region EA included in one sub-pixel. Specifically, the first region 131 and the second region 132 of the first electrode 130 may be classified based on the thickness difference.

For example, the thickness of the first region 131 may be greater than the thickness of the second region 132. Meanwhile, the thickness of the first electrode 130 may change the spectrum of the light emitted from the organic light emitting layer 150 disposed on the first electrode 130 according to the viewing angle. In detail, the spectral change of a specific wavelength depending on the viewing angle can be largely changed according to the thickness of the first electrode 130.

Therefore, the light emitted from the organic light emitting device EL according to the first embodiment may have a different spectral peak change for each region of the first electrode 130. [ The change in the peak of the spectrum of the light emitted from the organic light emitting element EL in the region corresponding to the first region 131 and the second region 132 of the first electrode 130 may be different.

Specifically, the organic light emitting element EL according to the first embodiment can emit white (W) light. At this time, the light emitting layer of the organic light emitting device EL according to the first embodiment may include at least two light emitting layers emitting light of different colors. For example, the organic luminescent layer may include two luminescent layers, one luminescent layer emits blue (B) light and the other one emits yellow-green (YG) light, resulting in the organic luminescent layer being white ) Light.

On the other hand, the peak of the specific wavelength of light generated in the region corresponding to the first region 131 of the first electrode 130 can be reduced as the viewing angle increases. For example, it is preferable that the wavelength of at least one of the wavelength corresponding to the blue (B) of light generated in the region corresponding to the first region 131 of the first electrode 130 and the wavelength corresponding to the yellow green (YG) Peaks can be reduced. Likewise, the peak of the specific wavelength of light generated in the region corresponding to the second region 132 of the first electrode 130 can be reduced as the viewing angle increases. For example, it is preferable that the wavelength of at least one of the wavelength corresponding to the blue (B) of light generated in the region corresponding to the second region 132 of the first electrode 130 and the wavelength corresponding to the yellow green (YG) Peaks can be reduced.

The difference in spectral peaks of the light emitted from the organic light emitting device EL differs from that of the organic light emitting device EL in that the light generated in the region corresponding to the first region 131 of the first electrode 130, The light generated in the region corresponding to the second region 132 of the electrode 130 may mean that the peak of any one of blue (B) and yellow (YG) colors is reduced. Further, as the viewing angle increases, the peak (i.e., the blue (B) peak and the yellow green (YG) peak) with respect to the white W wavelength generated in the region corresponding to the first region 131 of the first electrode 130 It may mean that the extent to which the peak of the white wavelength (W) generated in the region corresponding to the second region 132 of the first electrode 130 decreases.

At this time, the wavelength of the light with the greatest decrease in the peak in the region corresponding to the second region 132 may be different from the wavelength of the light with which the peak is greatly reduced in the region corresponding to the first region 131. This is because the thickness of the first electrode 130, which causes a peak change of a specific wavelength, differs for each region.

On the other hand, in general organic light emitting display devices, spectral peaks generated from the organic light emitting display device vary depending on the viewer's viewing position of the display device. In the organic light emitting display device according to the first embodiment, It is possible to prevent the peak of the spectrum generated from the light emitting display device from being changed.

Specifically, the light emitted from the organic light emitting element EL disposed in one subpixel passes through the first region 130 and the second region 132 of the first electrode 130, And is output to the outside of the organic light emitting display device.

Here, the light emitted from the region corresponding to the second region 132 can compensate the wavelength of the light with the largest peak among the light emitted from the region corresponding to the first region 131 of the first electrode 130 have. Also, the light emitted from the region corresponding to the first region 131 can compensate the wavelength of the light with the largest peak among the light emitted from the region corresponding to the second region 132 of the first electrode 130 have.

That is, the light emitted from the region corresponding to the first region 131 and the second region 132 of the first electrode 130 compensates for the light of the wavelength band whose peaks are reduced, Can be prevented from being changed.

One subpixel structure of the organic light emitting diode display having the above-described structure will be described in detail as follows. 3 is a cross-sectional view taken along line A-B in Fig. Referring to FIG. 3, one sub-pixel of the organic light emitting display according to the first embodiment includes at least one thin film transistor Tr electrically connected to the organic light emitting device EL and the organic light emitting device EL do.

Specifically, the buffer layer 101 is disposed on the substrate 100, and the active layer 102 is disposed on the buffer layer 101. [ A gate insulating film 105 may be disposed on the active layer 102 and a gate insulating film 105 may be disposed to overlap a channel layer (not shown) of the active layer 102. A gate electrode 103 is disposed on the gate insulating film 105.

The gate electrode 103 can be formed by laminating at least one or more of copper (Cu), molybdenum (Mo), aluminum (Al), silver (Ag), titanium (Ti) However, the material is not limited to this, and it can be formed of a material of a gate electrode and a gate line which are generally used. Further, although the figure is made of a single metal layer, in some cases, at least two or more metal layers may be stacked.

An interlayer insulating film 104 is disposed on the gate electrode 103. The source electrode 106a and the drain electrode 106b are arranged on the interlayer insulating film 104 so as to be spaced apart from each other and the source electrode 106a and the drain electrode 106b are electrically connected to each other through a contact hole formed in the interlayer insulating film 104, 0.0 > 102 < / RTI >

Here, the source electrode 106a and the drain electrode 106b may be formed of an alloy made of copper (Cu), molybdenum (Mo), aluminum (Al), silver (Ag), titanium (Ti) At least one of ITO (Indium Tin Oxide), IZO (Indium Tin Oxide), ITZO (Indium Tin Zinc Oxide), and ZnO (Zinc Oxide).

However, the material of the source electrode 106a and the drain electrode 106b is not limited to this and can be formed of a material of a commonly used data line. Further, although the figure is made of a single metal layer, in some cases, at least two or more metal layers may be stacked. As described above, the thin film transistor Tr can be disposed on the substrate 100. [

An overcoat layer 107 for protecting the source electrode 106a and the drain electrode 106b is disposed on the substrate 100 including the thin film transistor Tr. Here, the interlayer insulating film 104 and the overcoat layer 107 may all be insulating layers. On the overcoat layer 107, the first electrode 130 of the organic light emitting element EL is disposed.

A contact hole 170 for connecting the first electrode 130 to the drain electrode 106b of the thin film transistor Tr is formed in the overcoat layer 107 and the first electrode 130 is connected to the overcoat layer 107 through the contact hole 170. [ 130 and the drain electrode 106b may be connected to each other.

Here, the first electrode 130 may be made of a transparent conductive material having a high work function. For example, the first electrode 130 may be formed of one selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), and zinc oxide (ZnO). Although the first electrode 130 is a single layer in the drawing, the first electrode 130 may be composed of multiple layers.

As described above, the first electrode 130 is made of a transparent conductive material, so that a bottom-emission type OLED display can be realized. However, the organic light emitting display according to the present embodiment is not limited to the bottom emission type organic light emitting display, and may be applied to a top emission type organic light emitting display. Although the first electrode 130 of the organic light emitting diode display according to the present embodiment is a transparent conductive material, A composition that is an opaque conductive material may also be included.

The bank pattern 140 is disposed on both sides of the first electrode 130. At this time, the bank pattern 140 may be arranged to expose a part of the upper surface of the first electrode 130. Emitting region EA of the subpixel of the bank pattern 140 and the non-emitting region NEA. The organic light emitting layer 150 and the second electrode 160 of the organic light emitting device EL may be disposed on the first electrode 130 and the bank pattern 140.

The first electrode 130 of the organic light emitting diode EL may be divided into a first region 131 and a second region 132. Here, the thickness of the first region 131 may be thicker than the thickness of the second region 132. Specifically, the thickness of the first region 131 may be 1.3 to 2.4 times greater than the thickness of the second region 132. When the thickness of the first region 131 is less than 1.3 times or more than 2.4 times the thickness of the second region 132, the wavelength at which the peak decreases is not compensated according to the viewing angle, The color of the screen may be different.

The light generated in the region corresponding to the first region 131 corresponds to the second region 132 in the case where the thickness of the first region 131 is less than 1.3 times the thickness of the second region 132. [ It is impossible to sufficiently compensate the light of the wavelength band in which the peak of the light generated in the region where the light is generated.

When the thickness of the first region 131 exceeds 2.4 times the thickness of the second region 132, the light generated in the region corresponding to the second region 132 corresponds to the first region 131 It is impossible to sufficiently compensate the light of the wavelength band in which the peak of the light generated in the region where the light is generated. Therefore, there is a problem that the color of the screen varies depending on the viewing angle.

The area of the first region 131 of the first electrode 130 in the light emitting region EA may be equal to or different from the area of the second region 131. [

The area of the first region 131 of the first electrode 130 is equal to or different from the area of the second region 132 so that the peak of the light generated in the region corresponding to the first region 131 The light generated in the second region 132 can sufficiently compensate the light of the low wavelength band (this should be considered in detail in FIGS. 6 and 7).

In this case, the light generated in the first region 131 can sufficiently compensate the light of the wavelength range in which the peak of light generated in the region corresponding to the second region 132 is low

As described above, due to the difference in thickness of the first electrode 130, the first electrode 130 in the light emitting region EA of one subpixel may have at least one step. The organic light emitting layer 150 and the second electrode 160 of the organic light emitting device EL are disposed on the first electrode 130 and the bank pattern 140.

In this case, the organic light emitting layer 150 and the second electrode 160 may follow the morphology of the first electrode 130 in the light emitting region EA. That is, the organic light emitting layer 150 and the second electrode 160 may have a step difference in a region corresponding to a region where the first electrode 130 has a step. This means that the organic light emitting layer 150 has the same thickness in the region corresponding to each region of the first electrode 130, and therefore, the color coordinates are distorted due to the difference in thickness of the organic light emitting layer 150 in one light emitting region Can be prevented.

Meanwhile, the organic light emitting layer 150 of the OLED display according to the first embodiment may be an organic light emitting layer 150 that emits white light (W). For example, the organic light emitting layer 150 of the OLED display according to the first embodiment may include a plurality of light emitting layers.

 Specifically, the organic light emitting layer 150 according to the first embodiment may include three light emitting layers. The organic light emitting layer 150 can emit white light (W) by emitting blue (B) light in the two light emitting layers and yellow (YG) light in the other light emitting layer.

The organic light emitting display device having the organic light emitting layer 150 as described above may have different colors depending on viewing angles and can be prevented by applying the first electrode 130 according to the first embodiment . This will be described in detail with reference to FIGS. 4 and 5 as follows.

4 is a graph showing a change in viewing angle according to the first electrode thickness of the organic light emitting device. 5 is a table showing percent change in viewing angle according to the first electrode thickness of the organic light emitting device.

Referring to FIG. 4, the x axis in FIG. 4 represents the thickness of the organic light emitting device, and the y axis represents the viewing angle change rate. On the other hand, the viewing angle change rate of the organic light emitting device was adjusted by adjusting the angle between the organic light emitting device and the measuring device according to the present embodiment at 0 °, 15 °, 30 °, 45 °, and 60 ° using a PR-655 SpectraScan Spectroradiometer Respectively. As shown in FIG. 4, the change in the viewing angle spectrum varies depending on the thickness of the first electrode (ITO) of the organic light emitting diode.

Specifically, when the first electrode of the organic light emitting diode includes regions having different thicknesses, the viewing angle change rate is smaller than when the first electrode of the organic light emitting diode has a constant thickness.

More specifically, when the first electrode has a thickness of 500 Å and 1200 Å and the first electrode has a thickness of 700 Å and 1200 Å, the first electrode has a thickness of 500 Å, 700 Å and 1200 Å, It is understood that the viewing angle change rate is smaller than the case where the viewing angle is changed.

As described above, when the first electrode includes at least two regions having different thicknesses, the viewing angle change rate is smaller than when the first electrode has a constant thickness. Therefore, even when the viewer views the screen at various angles, You may not feel it.

Further, when the first electrodes have different thicknesses in one light emitting region, the color viewing angle change rate varies depending on the thicknesses of the first region and the second region to be combined. Specifically, when the thickness of the first region of the first electrode is fixed to 1200 ANGSTROM and the thickness of the second region is 500 ANGSTROM, the change of the color viewing angle is smaller than when the thickness of the second region is 700 ANGSTROM.

Therefore, the color viewing angle change rate can be adjusted according to the combination of the thicknesses of the first region and the second region of the first electrode.

5, the reduction ratio of the blue (B) and yellow (YG) peaks of the organic light emitting display according to the thickness of the first electrode can be determined according to the viewing angle. Here, when the reduction ratio of the blue (B) peak and the yellow green (YG) peak is 100% according to the viewing angle, it means that the color viewing angle is not changed. When the decrease ratio of the blue (B) peak and the yellow green (YG) peak is less than 100% according to the viewing angle, it is shown that the blue (B) peak greatly decreases in comparison with the yellow green (YG) peak, ) Peak and the yellow-green (YG) peak exceeds 100%, the yellow-green (YG) peak is greatly reduced compared to the blue (B) peak.

That is, as shown in FIG. 5, when the viewing angle is changed when the thickness of the first electrode is constant (when the thicknesses of the first electrodes are 500 A and 1200 ANGSTROM, respectively), any one of the blue (B) It can be seen that the peak greatly decreases and the color viewing angle largely changes. On the other hand, when the first electrode includes regions having different thicknesses (when the thickness of the first electrode is 500 ANGSTROM and 1200 ANGSTROM in one light emitting region), the blue (B) peak or the yellow green (YG) peak does not significantly decrease from the other peak, and the color viewing angle is hardly changed.

Specifically, when the thickness of the first electrode is 500 ANGSTROM in one luminescent region, when the viewing angle is changed, the peak of the yellowish green (YG) is greatly reduced as compared with the blue (B) peak and the blue (B) peak and the yellow green Is much greater than 100%. That is, when the thickness of the first electrode is 500 ANGSTROM, the blue (B) peak is significantly larger than the yellow-green (YG) peak, so that the viewer can see the bluish image due to the change of the viewing angle. When the first electrode thickness is 1200 ANGSTROM in one luminescent region, when the viewing angle is changed, the blue (B) peak is greatly reduced compared to the yellow green (YG) peak, and the reduction ratio of the blue (B) peak and the yellow green 100%. ≪ / RTI > That is, when the thickness of the first electrode is 500 ANGSTROM, the yellowish green (YG) peak is significantly larger than the blue (B) peak, so that the viewer can see the yellowish image .

On the other hand, when the first electrode having a thickness of 500 ANGSTROM and 1200 ANGSTROM simultaneously in one light emitting region is applied, the reduction ratio of the blue (B) peak and the yellow green (YG) peak does not deviate greatly from 100% even when the viewing angle changes . That is, when the first electrodes having different thicknesses in one light emitting region are used, it is understood that even when the viewing angle is changed, the color difference of the screen hardly occurs.

Next, referring to FIG. 6, the rate of change of the color viewing angle according to the area ratio of the first region to the second region of the first electrode is as follows. 6 is a graph showing a change in color viewing angle according to an area ratio of the first region to the second region of the first electrode of the organic light emitting device.

Referring to FIG. 6, as described above with reference to FIG. 3, the color viewing angle change rate may vary depending on the area ratio of the first region and the second region of the first electrode of the organic light emitting device.

6, the area ratio of the first region to the second region is set to 4: 6 (the first region has a thickness of 1200 ANGSTROM and the second region has a thickness of 500 ANGSTROM) When the area of the first area is 4 and the area of the second area is 6, it is understood that the color viewing angle change rate is the smallest.

When the area ratio of the first region to the second region is 4: 6 (when the area of the first region is 4, the area ratio of the first region to the second region is 4: 6) , And the area of the second area is 6), the color viewing angle change rate is the smallest.

As described above, it can be seen that the color viewing angle change rate can be adjusted according to the area ratio of the first region and the second region of the first electrode. In addition, when the thicknesses of the first region and the second region are different from each other, it is understood that the optimal area ratio that minimizes the color viewing angle change rate is varied.

This configuration will be described in more detail with reference to FIG. FIG. 7 is a table specifically showing a color viewing angle change rate according to an area ratio of the first region to the second region of the first electrode of the organic light emitting device.

7 is a graph illustrating the relationship between the first electrode and the second electrode when the thickness of the first region of the first electrode is 1200 ANGSTROM and the thickness of the second region is 500 ANGSTROM to 700 ANGSTROM. Of the viewing angle.

7, when the first electrode is formed only of the first region (that is, when the first electrode is formed only to a thickness of 1200 ANGSTROM) and the second region only (that is, when the first electrode is formed to either 500 ANGSTROM or 700 ANGSTROM (When only one thickness is used), the color viewing angle change rate is large.

On the other hand, when the thickness of the second region of the first electrode is 500 ANGSTROM and the area ratio of the first region to the second region is 8: 2 to 1: 9, when the first electrode is made only of a predetermined thickness (for example, It is seen that the rate of change of the color viewing angle is smaller than that of the case of 1200A: 500A = 10: 0 or 1200A: 500A = 0:10).

When the thickness of the second region of the first electrode is 700 ANGSTROM and the area ratio of the first region to the second region is 7: 3 to 1: 9, when the first electrode is made only of a predetermined thickness (for example, 1200A: 700A = 10: 0 or 1200A: 700A = 0: 10).

Taken together, it can be seen that when the area ratio of the first area to the second area is from 7: 3 to 1: 9, the rate of change of the color viewing angle according to the area ratio of the thickness combination of the first electrode decreases. That is, when the area ratio of the first area: the second area is 7: 3 to 1: 9, even if the viewer looks at the screen at various angles, the color difference may hardly be felt.

Next, the organic light emitting diode according to the second embodiment will be described with reference to FIG. 8 is a schematic view illustrating an organic light emitting diode of an OLED display according to a second embodiment of the present invention. The organic light emitting device according to the second embodiment may include the same components as those of the previously described embodiment. The description overlapping with the embodiment described above can be omitted. The same components have the same reference numerals.

Referring to FIG. 8, the organic light emitting device EL according to the second embodiment includes a first electrode 430 disposed on a substrate 100, an organic light emitting layer 450 disposed on the first electrode 430, And a second electrode 460 disposed on the organic light emitting layer 450.

In this case, the first electrode 430 may be divided into a first region 431, a second region 432, and a third region 433 in the light emitting region EA included in one subpixel. Specifically, the first region 431, the second region 432, and the third region 433 of the first electrode 430 may be classified based on the thickness difference. Specifically, the thickness of the first region 431 of the first electrode 430 may be greater than the thickness of the second region 432. The thickness of the second region 432 may be greater than the thickness of the third region 433.

The first area 431, the second area 432, and the third area 433 of the first electrode 430 have different thicknesses, so that the first area 431, the second area 432, The light generated in the region corresponding to the second region 432 or the third region 433 with respect to the wavelength at which the peak decreases in the light generated in the region where the peak is reduced can be compensated for. Likewise, the light generated in the region corresponding to the first region 431 or the third region 433 with respect to the wavelength at which the peak of light generated in the region corresponding to the second region 432 decreases as the viewing angle varies You can compensate. The light generated in the region corresponding to the first region 431 or the second region 432 with respect to the wavelength at which the peak of the light generated in the region corresponding to the third region 433 changes as the viewing angle changes, You can do it.

The areas of the first region 431, the second region 432 and the third region 432 of the first electrode 430 in the light emitting region EA may be the same or different from each other. The area of each region of the first electrode 430 can be adjusted so as to compensate for light of a specific wavelength reduced by the change of the viewing angle.

8, a region of the first electrode 430 is divided into three regions in one light emitting region EA. However, the first electrode 430 of the organic light emitting device according to the present embodiment has a structure in which And it is sufficient that the first electrode 430 can be divided into at least three regions depending on the thickness or the area.

That is, by including at least three regions in which the first electrode 430 has a different thickness or area, the light generated in the region corresponding to one region has a wavelength at which the peak decreases as the viewing angle of the light generated in the other region varies Can be compensated for.

Next, the organic light emitting device according to the third embodiment will be described with reference to FIG. 9 is a schematic view illustrating organic light emitting devices of the organic light emitting display according to the third embodiment. The organic light emitting devices according to the third embodiment may include the same components as those of the previously described embodiment. The description overlapping with the embodiment described above can be omitted. The same components have the same reference numerals.

Referring to FIG. 9, the organic light emitting display according to the third embodiment includes a plurality of light emitting regions EA1, EA2, and EA3. For example, the organic light emitting display according to the third embodiment includes a first light emitting region EA1, a second light emitting region EA2, and a third light emitting region EA3.

The first electrodes 530 and 630 of the organic light emitting elements arranged in the respective light emitting regions EA1, EA2 and EA3 are arranged in the light emitting regions EA1, EA2 and EA3, The other region may include at least two regions.

On the other hand, the first electrodes 530 and 630 of any one of the organic light emitting elements arranged in the respective light emitting regions EA1, EA2 and EA3 are connected to the first electrodes 530 and 630 of at least one adjacent organic light emitting element (530, 630) of different thicknesses. Specifically, the first electrode 530 disposed in the first emission region EA1 may include a region having a different thickness from the first electrode 630 disposed in the adjacent second emission region EA2.

 More specifically, the first electrode 530 disposed in the first light emitting region EA1 includes a first region 531 and a second region 532, and the first electrode 530 disposed in the second light emitting region EA2 One electrode 630 includes a third region 631 and a fourth region 642. At this time, the thickness of the second region 532 of the first electrode 530 disposed in the first light emitting region EA1 and the thickness of the fourth region 530 of the first electrode 630 disposed in the second light emitting region EA2 642 may vary.

9 shows the relationship between the thickness of the second region 532 of the first electrode 530 disposed in the first light emitting region EA1 and the thickness of the second region 532 of the fourth electrode 630 disposed in the second light emitting region EA2. The structure of the organic light emitting devices according to the present embodiment is not limited to this, and the first region 530 of the first electrode 530 disposed in the first light emitting region EA1 may have a different thickness, The thickness of the third region 631 of the first electrode 630 of the second light emitting region EA2 may be different from the thickness of the third region 631 of the second light emitting region EA2.

The first electrode 630 disposed in the second light emitting region EA2 and the first electrode 630 disposed in the third light emitting region EA3 may be formed in the same manner. The first electrode 630 disposed in the second emission region EA2 includes a third region 631 and a fourth region 632 having different thicknesses. And may also be disposed in the third light emitting area EA3.

9, the first electrode 630 disposed in the second light emitting area EA2 and the first electrode 630 disposed in the third light emitting area EA3 have the same structure. However, The embodiment is not limited to this, and the first electrode 630 disposed in the second light emitting area EA2 and the third light emitting area EA3 may include regions having different thicknesses.

As described above, the first electrodes 530 and 630 of any one of the organic light emitting elements disposed in the respective light emitting regions EA1, EA2, and EA3 may be formed of at least one organic light emitting element By including regions having different thicknesses from the first electrodes 530 and 630, wavelengths at which the peaks are reduced in accordance with the viewing angles in units of the light emitting regions are compensated, so that the viewer can hardly notice color difference even when viewing the screen at various angles.

In other words, a wavelength at which the peak decreases according to the viewing angle in the first luminescent region EA1 is compensated by the second luminescent region EA2 and the third luminescent region EA3 to reduce the rate of change of the color viewing angle of the OLED display There is an effect.

As described above, in the organic light emitting display according to the present embodiments, the first electrode of the organic light emitting device disposed in one light emitting region has a plurality of thicknesses, so that the rate of change of the color viewing angle of the organic light emitting display device can be reduced.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Further, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified in other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified and implemented.

100: substrate
130: first electrode
131: first region
132: second area
150: organic light emitting layer
160: Second electrode

Claims (9)

A substrate divided into a plurality of subpixels;
A first electrode provided in each of the plurality of subpixels and including at least two regions having different thicknesses;
An organic light emitting layer disposed on the first electrode; And
And a second electrode disposed on the organic light emitting layer.
The method according to claim 1,
Wherein the first electrode is made of a transparent conductive material.
The method according to claim 1,
Wherein the first electrode includes a first region and a second region having different thicknesses,
Wherein the thickness of the first region is 1.3 to 2.4 times greater than the thickness of the second region.
The method of claim 3,
Wherein the first electrode further comprises at least one region different in thickness from the first region and the second region.
The method of claim 3,
Wherein the first electrode further comprises a third region having a thickness different from the first region,
Wherein the thickness of the first region is 1.3 to 2.4 times greater than the thickness of the third region.
The method according to claim 1,
Wherein the first electrode includes a first region and a second region having different thicknesses,
Wherein an area ratio of the first region to the second region is from 7: 3 to 1: 9.
The method according to claim 1,
Wherein the first electrode includes at least one region different in thickness from the first electrode included in adjacent sub-pixels.
The method according to claim 1,
Wherein the first electrode includes at least one step.
9. The method of claim 8,
Wherein the organic light emitting layer and the second electrode follow the morphology of the first electrode.

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