KR102265610B1 - Organic electro luminescent device - Google Patents

Abstract

The present invention relates to an organic electroluminescent device capable of improving display quality by suppressing a reddish or greenish phenomenon according to a change in viewing angle while driving in a top emission mode, and emitting light of three colors, respectively A substrate having a display area having a plurality of pixel areas having first, second, and third light-emitting areas, each pixel area on the substrate overlaps with the first, second, and third light-emitting areas. and an organic light emitting diode which is sequentially stacked on the first, second and third light emitting regions on the array element and includes a first electrode, an organic light emitting layer, and a second electrode, wherein the plurality of pixels The first, second and third light emitting regions are spaced apart from each other inside each region, and the long axis directions of the first and second light emitting regions and the long axis directions of the third light emitting regions are orthogonal to each other, and the display The first and second light emitting regions corresponding to the first ratio among all the first and second light emitting regions provided in the region are configured such that one side in the long axis direction overlaps the array element, and the first and second light emitting regions are the remaining portions except for the first ratio. The first and second light emitting regions corresponding to the ratio of 2 provide an organic light emitting device, characterized in that the other side in the long axis direction is configured to overlap the array device.

Description

Organic electro luminescent device

The present invention relates to an organic electroluminescent device, and in particular, an organic electroluminescent device having an arrangement structure of a light emitting region capable of realizing high resolution and high aperture ratio, and having excellent display quality by eliminating color change due to change in viewing angle It's about the little ones.

An organic light emitting diode, which is one of flat panel displays (FPDs), has high luminance and low operating voltage characteristics.

In addition, since the organic light emitting device is a self-luminous type that emits light by itself, the contrast ratio is large, it is possible to realize an ultra-thin display, and it is easy to implement a moving image with a response time of several microseconds (㎲), and the viewing angle is limited. It is stable even at low temperature and is driven by a low voltage of 5 to 15V of DC, so it is easy to manufacture and design a driving circuit.

Accordingly, the organic electroluminescent device having the above-described advantages has recently been used in various IT devices such as TVs, monitors, and mobile phones.

Hereinafter, the basic structure of the organic EL device will be described in more detail.

The organic light emitting diode is largely composed of an array element and an organic light emitting diode.

The array element includes a switching thin film transistor connected to a gate and a data line, and a driving thin film transistor connected to the organic light emitting diode, and the organic light emitting diode is sequentially stacked and includes a first electrode connected to the driving thin film transistor and an organic element. It consists of a light emitting layer and a 2nd electrode.

The organic electroluminescent device having such a configuration displays an image by emitting light generated from the organic light emitting layer toward the first electrode or the second electrode. In recent years, such organic light emitting devices have a structure capable of forming a relatively large light emitting area within each pixel area and are manufactured in a top light emission method for displaying an image using light emitted toward the second electrode.

However, in the conventional top emission type organic light emitting device, the elements constituting the array device are disposed in whole or in part under the organic light emitting diode in the light emitting area within each pixel area, so that a predetermined step portion is formed.

Accordingly, in the conventional top emission type organic light emitting device, the organic light emitting layer has a predetermined angle with respect to the substrate surface and is formed to be inclined in one or both directions. Reddish) or greenish (greenish) color is displayed, the display quality is deteriorated.

The present invention has been devised to solve this problem, and it is possible to provide an organic electroluminescent device capable of improving display quality by suppressing a reddish or greenish phenomenon due to a change in viewing angle while driving in a top emission mode. for that purpose to provide.

In order to achieve the above object, in the organic light emitting diode according to an embodiment of the present invention, a display area including a plurality of pixel areas having first, second and third light emitting areas emitting three colors is defined. a substrate, an array element formed to overlap each pixel area on the substrate with the first, second and third light-emitting areas, and the first, second, and third light-emitting areas are sequentially stacked on the array element. and an organic light emitting diode comprising a first electrode, an organic light emitting layer, and a second electrode, wherein the first, second and third light emitting areas are spaced apart from each other in each of the plurality of pixel areas, and The major axis directions of the first and second light emitting regions and the long axis directions of the third light emitting region are orthogonal to each other, and the first light emitting region corresponding to the first ratio among all the first light emitting regions provided in the display area is in the long axis direction. is configured to overlap with the array element, and the first light emitting region corresponding to the second ratio excluding the first ratio is configured such that the other side in the long axis direction overlaps the array element, and is provided in the display area The second light emitting area corresponding to the third ratio among all the second light emitting areas is configured so that one side in the long axis direction overlaps the array element, and the second light emitting area corresponding to the fourth ratio except for the third ratio It is characterized in that the other side in the long axis direction is configured to overlap the array element.

In this case, the first ratio and the third ratio have a value greater than 0 and less than 1, respectively, and the absolute value of the difference between the first ratio and the third ratio is 0 to 0.2, and the first ratio and the second ratio When the first ratio among the two ratios is greater than the second ratio, it is preferable that the third ratio among the third ratio and the fourth ratio is larger than the fourth ratio.

An organic emission layer emitting red light may be provided in the first emission region, an organic emission layer emitting green light may be provided in the second emission region, and an organic emission layer emitting blue light may be provided in the third emission region.

In addition, an organic light emitting layer emitting blue light corresponding to the entire surface of the display area is provided, an organic light emitting layer emitting red light together with an organic light emitting layer emitting blue light is provided in the first light emitting area, and blue light emitting area is provided in the second light emitting area An organic light emitting layer emitting green light may be provided together with the organic light emitting layer emitting light.

Meanwhile, the pixel area is divided into three sub-pixel areas, and the array element is formed for each sub-pixel area within each pixel area, and the first ratio of all the first and second light-emitting areas including the display area is The corresponding first emission region and the second emission region corresponding to the third ratio overlap the array elements provided in the first sub-pixel region, and the first emission region corresponding to the second ratio and the third ratio The second light emitting region corresponding to , is characterized in that it overlaps the array element provided in the second sub-pixel region.

At this time, the positions of the array elements provided for each sub-pixel region within each pixel region are fixed equally for each pixel region, and one side or the other side overlaps with the array element for each pixel region. 2 It is characterized in that the position of the light emitting area is different for each pixel area.

The pixel region is divided into three sub-pixel regions, and the array element includes three first, second, and third array elements spaced apart from each other in each pixel region, and the first and second array elements are each It is configured to correspond to the first and second sub-pixel regions, and the third array element is configured to correspond to the third sub-pixel region.

In this case, the positions of the first, second, and third light emitting regions provided in each pixel region for each pixel region are identically fixed, and the first and second light emitting regions overlapping the first and second emission regions for each pixel region are identically fixed. It is characterized in that the position of the array element is different for each pixel area.

The array element includes a switching thin film transistor and a driving thin film transistor, and on the substrate, a gate line and a data line connected to the switching thin film transistor and intersecting each other are provided, spaced apart from the data line and connected to the driving thin film transistor Power wiring is provided. In addition, a planarization layer covering the array element and having a drain contact hole exposing one electrode of the driving thin film transistor is provided, and the planarization layer is in contact with one electrode of the driving thin film transistor through the drain contact hole on the planarization layer. A first electrode is provided, and the planarization layer forms an inclined surface in the first and second light emitting regions with a portion overlapping the array element as an upper portion and a portion not overlapping with the array element as a lower portion in the first and second light emitting regions. .

The organic electroluminescent device according to the present invention is implemented in a top emission method, so that the aperture ratio is maintained through efficient arrangement of the emission region in one pixel region composed of three sub-pixel regions, and the green nish or redish according to the change in the viewing angle is maintained. There is an effect of improving the display quality by eliminating the phenomenon.

1 is a circuit diagram of one pixel of a general organic electroluminescent device.
FIG. 2 is a schematic plan view of four pixel regions adjacent to each other vertically, horizontally, horizontally and vertically of the organic light emitting diode according to the first embodiment of the present invention, schematically showing only the emission region and the region in which the array element is formed.
Fig. 3 is a cross-sectional view of Fig. 2 taken along line III-III;
Fig. 4 is a cross-sectional view of Fig. 2 taken along the cutting line IV-IV;
FIG. 5 is a schematic cross-sectional view of the first and second light emitting regions respectively provided in the four pixel regions shown in FIG. 2 . All components are omitted, and an array element and a planarization layer overlapping each of the first and second light emitting regions. and a diagram briefly showing only the organic light emitting layer.
6A to 12A are schematic plan views of four pixel regions adjacent to each other vertically, horizontally, horizontally and vertically of the organic light emitting diode according to the second to eighth embodiments of the present invention. the drawing shown.
6B to 12B are schematic cross-sectional views of the first and second light emitting regions provided in each of the four pixel regions shown in FIGS. 6A to 12B respectively, and all components are omitted and each of the first and second light emitting regions and A diagram schematically showing only the overlapped array element, the planarization layer, and the organic light emitting layer.
13 to 20 are schematic plan views of four pixel regions adjacent to each other vertically, horizontally and horizontally of the organic electroluminescent device according to modified examples of the first to eighth embodiments of the present invention, in which the emission region and the array element are formed. A schematic diagram of the bay.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the drawings.

First, the configuration and operation of one sub-pixel region of the organic light emitting diode will be briefly described.

1 is a circuit diagram of one sub-pixel region of a typical organic light emitting device.

As shown, in each sub-pixel region SP of the organic light emitting device, a switching thin film transistor STr, a driving thin film transistor DTr, a storage capacitor StgC, and an organic light emitting diode E are provided. is becoming

A gate line GL is formed in a first direction, a data line DL is formed to define a sub-pixel area SP in a second direction crossing the first direction, and the data line DL A power supply line PL for applying a power supply voltage is formed while being spaced apart from each other.

In addition, a switching thin film transistor STr is formed in a portion where the data line DL and the gate line GL intersect, and the switching thin film transistor STr and the switching thin film transistor STr are electrically formed in each of the sub-pixel regions SP. A connected driving thin film transistor (DTr) is formed.

At this time, the driving thin film transistor (DTr) is electrically connected to the organic light emitting diode (E). That is, the first electrode, which is one terminal of the organic light emitting diode (E), is connected to the drain electrode of the driving thin film transistor (DTr), and the second electrode, which is the other terminal, is connected to the power supply line (PL). At this time, the power supply wiring PL transfers the power supply voltage to the organic light emitting diode E.

Also, a storage capacitor StgC is formed between the gate electrode and the source electrode of the driving thin film transistor DTr.

Accordingly, in the organic light emitting diode having such a configuration, when a gate signal is applied through the gate line GL, the switching thin film transistor STr is turned on, and a data signal is transmitted through the data line DL to the driving thin film. The light is output through the organic light emitting diode (E) because it is transmitted to the gate electrode of the transistor (DTr) and the driving thin film transistor (DTr) is turned on (on).

At this time, when the driving thin film transistor DTr is in an on state, the level of the current flowing from the power wiring PL to the organic light emitting diode E is determined, and thus the organic light emitting diode E is It is possible to implement a gray scale, and the storage capacitor StgC serves to constantly maintain the gate voltage of the driving thin film transistor DTr when the switching thin film transistor STr is turned off. By doing so, even if the switching thin film transistor STr is turned off, the level of the current flowing through the organic light emitting diode E can be constantly maintained until the next frame.

On the other hand, although FIG. 1 shows that the organic light emitting diode E is provided inside the sub pixel area SP, the organic light emitting diode driven in the top light emitting method is divided into the sub pixel area SP and the light emitting area. Therefore, the organic light emitting diode E does not need to be provided in the sub-pixel region SP, and may be configured to extend to a neighboring sub-pixel region (not shown).

2 is a schematic plan view of four pixel regions adjacent to each other vertically, horizontally, horizontally and vertically of the organic light emitting diode according to the first embodiment of the present invention, schematically showing only the emission region and the region in which the array element is formed; FIG. 3 is a cross-sectional view of the portion cut along the cutting line III-III of FIG. 2, FIG. 4 is a cross-sectional view of the portion cut along the cutting line IV-IV of FIG. 2, and FIG. 5 is the 4 shown in FIG. As a schematic cross-sectional view of the first and second light emitting regions provided in each of the pixel regions, all components are omitted and only the array element, the planarization layer, and the organic light emitting layer overlapping each of the first and second light emitting regions are briefly shown. The organic light emitting layer is shown together with oblique arrows.

At this time, for convenience of explanation, each of the pixel areas P(P1, P2, P3, P4) consists of three sub-pixel areas SP1, SP2, and SP3, and each of the sub-pixel areas SP1, SP2, SP3) is defined as an area captured by a gate line (not shown) and a data line (not shown) crossing each other, and pixel areas arranged on the same line in the second direction are defined as vertical pixel lines PL1 and PL2. and pixel regions arranged on the same line in the first direction are defined as horizontal pixel lines SPL1 and SPL2.

2 and 5, as shown, the organic electroluminescent device 100 according to the first embodiment of the present invention includes each pixel region (SP1, SP2, SP3) provided with three sub-pixel regions (SP1, SP2, SP3). One feature is that in P1, P2, P3, and P4), the red and green light emitting regions and the blue light emitting regions are arranged dually. In this case, for convenience of explanation, the red emission region is the first emission region EA1, the green emission region is the second emission region EA2, and the blue emission region is the third emission region EA3. ) is defined as

That is, the first and second light emitting areas EA1 and EA2 emitting red and green light are arranged in a form in which their long axes are arranged in a first direction and alternately in a second direction perpendicular to the first direction, , the third light emitting area EA3 emitting blue light is characterized in that its long axis is disposed in the second direction and alternately with the first and second light emitting areas EA1 and EA2 in the first direction. .

In this case, the third light-emitting area EA3 emitting blue light is located inside the third sub-pixel area SP3, while the first and second light-emitting areas EA1 and EA2 are the first sub-pixel area SP1. It is characterized in that it is formed over both sides of the two sub-pixel areas SP1 and SP2, including the boundary between the second sub-pixel area SP2 and the second sub-pixel area SP2.

The dual arrangement of the first and second light emitting areas EA1 and EA2 and the third light emitting area EA3 as described above realizes high resolution and the efficiency of the organic light emitting layer emitting red, green, and blue light provided in each light emitting area, respectively. and to consider the resolution of the metal mask used to form these organic light emitting layers while considering the lifetime.

In the case of the metal mask used for the deposition of the organic light emitting layer, the side of the opening corresponding to the light emitting region is generally manufactured by an etching method and in order to minimize a shadow effect during the deposition process using the organic light emitting material. It is formed to have a tapered shape. Accordingly, in the metal mask, the size of the opening in the surface facing the substrate on which the organic light emitting layer is deposited is different from the size of the opening in the deposition direction.

A metal mask having such an aperture structure cannot achieve high resolution, for example, higher than 300 ppi. This is because the minimum area required for forming the opening of the metal mask and the distance between the openings are limited. If the opening is too narrow, it is difficult to realize the desired shape, and the adjacent openings stick together. If the opening distance, that is, the lip width, is too narrow, the overall etching rate increases, resulting in a decrease in the mechanical strength of the metal mask itself. because it does

Therefore, in order to solve this problem, a dual arrangement structure of the first and second light emitting areas EA1 and EA2 and the third light emitting area EA3 as described above has been proposed.

When forming the arrangement structure of the light emitting areas EA1, EA2, and EA3 as in the first embodiment of the present invention, the metal mask may use a slot type rather than a straight type, and it is relatively in the opening arrangement characteristics compared to the stripe type metal mask. This is because an organic light emitting layer having a high resolution of 300 ppi or higher can be finally formed by strengthening the rigidity and the like because there is a margin in the lip width and the like.

On the other hand, in the organic electroluminescent device 100 according to the first embodiment of the present invention, the arrangement of the first and second light emitting areas EA1 and EA2 is dualized with the third light emitting area EA3 to form the first and second light emitting areas EA3. The reason why the boundary of the sub-pixel regions SP1 and SP2 can be included is because the top emission type structure is formed.

The organic electroluminescent device has array elements A1, A2, and A3 therein, and requires a region to form it. In the case of a bottom light emitting organic light emitting device, the light emitted from the organic light emitting layer is transmitted to the first electrode and As light is emitted to the surface of the substrate on which the array element is formed, light is blocked in a portion covered by the array element, so that the array element cannot be overlapped in the light emitting area. Therefore, the organic electroluminescent device of the bottom light emitting method has a low degree of freedom in designing the array device, and the light emitting area must be secured so as not to overlap the array device, so the aperture ratio is reduced.

However, in the case of the top emission type organic light emitting device, since the light emitted from the organic light emitting layer is emitted toward the second electrode, the arrangement of the array device is not related to whether the array device is overlapped or not overlapped with respect to the light emitting area. It has a degree of freedom and a light emitting region may be defined separately from such an array element.

Therefore, the top emission type organic light emitting device 100 as disclosed in the first embodiment of the present invention can secure a relatively wide light emitting area compared to the bottom emission type organic light emitting device, so it is excellent in terms of improving the aperture ratio. something to do.

Due to the structural characteristics of the top light emitting method, in the organic light emitting device 100 according to the first embodiment of the present invention, the light emitting region can be disposed regardless of the arrangement of the array devices A1, A2, and A3. The dual arrangement of the same first and second light emitting areas EA1 and EA2 and the third light emitting area EA3 is possible.

Meanwhile, in the organic electroluminescent device according to the first embodiment of the present invention having such an arrangement structure of each light emitting region, as another characteristic configuration, first pixel regions (and third pixel regions) adjacent to each other in the first direction The arrangement of the first and second light emitting areas EA1 and EA2 in the interior is different from the arrangement of the first and second light emission areas EA1 and EA2 in the second pixel area (and the fourth pixel area).

That is, the array elements A1 and A2 provided in each of the first and second light-emitting areas EA1 and EA2 and the first and second sub-pixel areas SP1 and SP2 are more precisely source or drain electrodes of the driving TFT. It is characterized in that the location of the overlapping region of the phyllotaxis is different.

For the odd vertical pixel line PL1 , the left area of the alternating first and second light emitting areas EA1 and EA2 overlaps the array elements A1 and A2 and the right area does not overlap, and the even vertical pixel With respect to the line PL2 , the right area of the alternating first and second light emitting areas EA1 and EA2 overlaps the array elements A1 and A2 and the left area does not overlap with each other.

In this way, like the organic electroluminescent device according to the first embodiment of the present invention, the positions of the overlapping regions of the first and second light emitting areas EA1 and EA2 and the array elements A1 and A2 are aligned with the odd vertical pixel line PL1 and The reason why the even-numbered vertical pixel lines PL2 are configured differently is to solve the redish or greenish phenomenon caused by the change in the viewing angle.

In the case of a general top emission type organic light emitting diode, a portion in which the light emitting region overlaps the array element and a portion that does not overlap may exist. In this case, a step is generated in the portion overlapping the array element region due to the formation of the array element, so that the thickness of the planarization layer is infinitely thick even if a planarization layer is provided on the array element to flatten the step. Therefore, the step difference due to the array element cannot be completely overcome. As a result, the light emitting region is inclined from the overlapping portion to the non-overlapping portion on the surface of the planarization layer.

Accordingly, the organic light emitting layer provided in the light emitting region is also formed with a predetermined inclination due to the predetermined inclination generated in the planarization layer. The arrangement of the light emitting region and the array element region is the same for each pixel region.

In other words, all the first light-emitting regions emitting red light overlap the array elements provided in the first sub-pixel area, and all second light-emitting areas emitting green light are configured to overlap the array elements provided in the second sub-pixel area. Accordingly, a redish or greenish phenomenon occurs according to a change in the viewing angle angle at which the user views the display area.

That is, when viewed from the right side of the central portion of the display area, a reddish phenomenon occurs, and when viewed from the left side, a greenish phenomenon occurs, resulting in deterioration of display quality.

However, in the case of the organic light emitting device 100 according to the first embodiment of the present invention, each odd vertical pixel line PL1 and even vertical pixel line PL2, that is, vertical pixel lines PL1 adjacent to each other left and right. The overlapping areas of the first light emitting area EA1 and the second light emitting area EA2 with the array elements A1 and A2 are different for each PL2), so that the redish or greenish phenomenon caused by the change in the viewing angle is eliminated and the display quality is improved. effect will be realized.

More specifically, in the case of the organic electroluminescent device 100 according to the first embodiment of the present invention, a first emitting device that emits red light in each of the pixel regions P1 and P3 disposed on the odd vertical pixel line PL1 is The left side of the first light emitting area EA1 and the second light emitting area EA2 which emits green light, that is, the portion located in the first sub-pixel area SP1, is formed to overlap the array element A1, while the even vertical In each of the pixel areas P2 and P4 arranged on the pixel line PL2 , the right side of the first light emitting area EA1 emitting red light and the second light emitting area EA2 emitting green light, that is, the second sub-pixel A portion positioned in the region SP2 is formed to overlap the array element A2 .

Therefore, in the case of the organic light emitting device 100 according to the first embodiment of the present invention, the left part of the first light emitting area corresponding to the first ratio among all the first light emitting areas EA1 formed in the entire display area is the array element. By being configured to overlap with (A1), the first light emitting region corresponding to these first ratios is inclined from left to right. Accordingly, in the first light emitting area EA1 corresponding to the first ratio, red is emitted at a predetermined angle to the right with respect to the normal direction of the central portion of the display area. In addition, with respect to the first light emitting area EA1 corresponding to the second ratio, which is the remaining ratio except for the first ratio, the right side of the first light emitting area EA1 is configured to overlap the array element A2, so that the first light emitting corresponding to the second ratio is formed. The area EA1 is inclined from right to left. Accordingly, in the first light emitting area EA1 corresponding to the second ratio, red is emitted at a predetermined angle to the left with respect to the normal direction of the central portion of the display area.

In addition, in the case of the organic light emitting device 100 according to the first embodiment of the present invention, the left part of the first light emitting area corresponding to the third ratio among all the second light emitting areas EA2 formed in the entire display area is an array. By being configured to overlap the device A1, the second light emitting area EA2 corresponding to the third ratio is inclined from the left to the right. Accordingly, in the second light emitting area EA2 corresponding to the third ratio, green is emitted at a predetermined angle to the right with respect to the normal direction of the central portion of the display area. In addition, with respect to the second light emitting area corresponding to the fourth ratio, which is the remaining ratio except for the third ratio, a right portion thereof is configured to overlap the array element A2, and thus the second light emitting area EA2 corresponding to the fourth ratio is configured to overlap with the array element A2. ) is inclined from right to left. Accordingly, in the second light emitting area EA2 corresponding to the fourth ratio, green is emitted at a predetermined angle to the left with respect to the normal direction of the central portion of the display area.

In the drawings, the first ratio and the third ratio are each 1/2, and the second ratio and the fourth ratio are also 1/2 respectively, as an example, but the first ratio and the second ratio are ' The first ratio + second ratio = 1' may be appropriately adjusted within a range that satisfies, and the third ratio and the fourth ratio may also be appropriately adjusted within a range that satisfies 'third ratio + fourth ratio = 1'. have.

At this time, in order to suppress the occurrence of the redish and greenish phenomenon according to the change of the viewing angle, it is most preferable that the first ratio and the third ratio have the same value, but the absolute value of the difference, that is, the 'first ratio - the third ratio' Alternatively, even if the absolute value of the 'third ratio - the first ratio' is 0.2 or less, although the redish and greenish phenomena are minutely generated, the user hardly feels the redish or greennish phenomenon according to the change of the viewing angle. Could know. Accordingly, the first ratio and the third ratio do not necessarily have the same value, and the absolute value of the difference may be freely changed within the range of 0 to 0.2. In this case, when the first ratio among the first ratio and the second ratio is greater than the second ratio, it is preferable that the third ratio among the third ratio and the fourth ratio is larger than the fourth ratio.

On the other hand, in the organic light emitting diode according to the first embodiment of the present invention, the first light emitting area EA1 corresponding to the first ratio among all the first light emitting areas EA1 formed in the entire display area is at the center of the display area. Red is emitted with a bias to the left with respect to the normal direction, and among all the second light emitting areas EA2 formed in the entire display area, the second light emitting area EA2 corresponding to the third ratio is in the normal direction of the center of the display area. Green is emitted with a bias to the left based on , and the first light emitting area EA1 corresponding to the second ratio among all the first light emitting areas EA1 formed in the entire display area corresponds to the normal direction of the center of the display area. Red is emitted with a bias to the right as a reference, and the second light emitting area EA2 corresponding to the fourth ratio among all the second light emitting areas EA2 formed in the entire display area is based on the normal direction of the center of the display area. As a result, green light is emitted toward the right side of the display area, so that even when the display area is viewed from the right and left sides of the display area based on the normal direction of the central part of the display area, the red and green light emitted by the left and right sides is substantially the same or less than or equal to 0.2. It has a ratio difference and is emitted biased to the right and left. Moreover, when the first ratio is greater than the second ratio, the third ratio is larger than the fourth ratio. Accordingly, the red emitted with a right bias at the first ratio is compensated for by the green emitted with a right bias with the third ratio, and the red emitted with a left bias with the second ratio is green emitted with a left bias with the fourth ratio. By being compensated by , the redish and greennish phenomenon can be resolved.

The overlapping positions of the first and second light emitting areas EA1 and EA2 and the array elements A1 and A2 may be variously modified other than those shown in the first embodiment of the present invention shown in FIG. 2 .

6A to 12A are schematic plan views of four pixel regions adjacent to each other vertically, horizontally, horizontally and vertically of the organic light emitting diode according to the second to eighth embodiments of the present invention. 6B to 12B are schematic cross-sectional views of the first and second light emitting areas EA1 and EA2 respectively provided in the four pixel areas shown in FIGS. 6A to 12B, and all components are omitted and each Only the array elements A1 and A2, the planarization layer 140, and the organic light emitting layer 155 overlapped with the first and second light emitting areas EA1 and EA2 are briefly shown, and the organic light emitting layer 155 is indicated by an arrow pointing in an oblique direction. shown together.

6A and 6B , in the case of the organic light emitting diode according to the second embodiment of the present invention, the first and second light emitting areas EA1 and EA2 of the odd horizontal pixel line SPL1 and the even horizontal pixel line The overlapping arrangement of the first light emitting area EA1 with the array elements A1 and A2 of SPL2 is the same as that of the first embodiment, and among the second light emitting areas EA2 disposed on the even horizontal pixel line SPL2, the odd number The second light emitting area EA2 corresponding to the vertical pixel line PL1 overlaps the array element A2 provided in the second sub pixel area SP2 to form an inclined surface at the lower right and left, and the even vertical pixel line PL2 is formed. It is characterized in that the second emission area EA2 corresponding to , overlaps with the irradiation of the array provided in the first sub-pixel area SP1, so that the left, top, right and bottom inclined surfaces are formed.

The organic electroluminescent device 200 according to the second embodiment of the present invention having such a configuration is also the same as the organic electroluminescent device (100 in FIG. 2 ) according to the first embodiment of the present invention. When viewed as a whole, the display area The first light emitting area EA1 corresponding to the first ratio among all the first light emitting areas EA1 formed in the entirety and the second light emitting area EA2 corresponding to the third ratio among all the second light emitting areas EA2 are the upper left. A first light emitting area EA1 having a lower right slanted surface and corresponding to a second ratio remaining except for the first ratio and a second light emission area EA2 corresponding to a fourth ratio remaining except for the third ratio are Since it has an inclined surface on the upper right and lower left, the same effect as that of the organic electroluminescent device 100 in FIG. 2 according to the first embodiment is realized.

7A and 7B , in the case of the organic light emitting diode 300 according to the third embodiment of the present invention, the first and second light emitting regions EA1 and EA2 of the odd horizontal pixel line SPL1 and the even number The arrangement of the horizontal pixel line SPL2 overlapping the second emission area EA2 with the array elements A1 and A2 is the same as that of the first embodiment, and the first emission area EA1 disposed in the even horizontal pixel line SPL2. ), the first light emitting area EA1 corresponding to the odd vertical pixel line PL1 overlaps the array element A2 provided in the second sub pixel area SP2 to form an inclined surface at the lower right and left, and the even vertical pixel line The first light emitting area EA1 corresponding to PL2 overlaps with the array irradiation provided in the first sub-pixel area SP1, so that the left, top, right and bottom inclined surfaces are formed.

8A and 8B , in the case of the organic light emitting diode 400 according to the fourth embodiment of the present invention, the first and second light emitting areas EA1 and EA2 of the odd horizontal pixel line SPL1 and the array The overlapping arrangement with the elements A1 and A2 is the same as that of the first embodiment, and corresponds to the odd vertical pixel line PL1 among the first and second light emitting areas EA1 and EA2 arranged on the even horizontal pixel line SPL2. The first and second light emitting areas EA1 and EA2 used as the first and second light emitting areas EA1 and EA2 overlap the array element A2 provided in the second sub pixel area SP2 to form an inclined surface at the lower right and lower left, and correspond to the even vertical pixel line PL2. The first and second light emitting areas EA1 and EA2 overlap with the array irradiation provided in the first sub-pixel area SP1, so that the inclined surfaces on the left, top, right and bottom are formed.

9A and 9B , in the case of the organic light emitting diode 500 according to the fifth embodiment of the present invention, the first and second light emitting areas EA1 and EA2 of the even horizontal pixel line SPL2 and the odd number The horizontal pixel line SPL1 overlaps the first light emitting area EA1 with the array elements A1 and A2 as in the first embodiment, and the second light emitting area EA2 is disposed on the odd horizontal pixel line SPL1. ), the second light emitting area EA2 corresponding to the odd vertical pixel line PL1 overlaps the array element A2 provided in the second sub pixel area SP2 to form an inclined surface at the bottom right and left, and the even vertical pixel line The second light emitting area EA2 corresponding to PL2 overlaps with the array irradiation provided in the first sub-pixel area SP1 , so that the left, top, right and bottom inclined surfaces are formed.

10A and 10B , in the case of the organic light emitting diode according to the sixth embodiment of the present invention, the first light emitting area EA1 of the odd horizontal pixel line SPL1 and the first light emitting area EA1 of the even horizontal pixel line SPL2 are The overlapping arrangement of the second light emitting area EA2 and the array elements A1 and A2 is the same as that of the first embodiment, and among the second light emitting areas EA2 disposed on the odd horizontal pixel line SPL1, the odd vertical pixel line PL1 ) overlaps the array element A2 provided in the second sub-pixel area SP2 to form an inclined surface in the lower right-left corner, and a second light-emitting area EA2 corresponding to the even-numbered vertical pixel line PL2 is formed. As the light emitting area EA2 overlaps with the array irradiation provided in the first sub pixel area SP1 , inclined surfaces on the left, top, right and bottom are formed, and among the first light emitting areas EA1 disposed on the even horizontal pixel line SPL2 , odd numbers The first light emitting area EA1 corresponding to the vertical pixel line PL1 overlaps the array element A2 provided in the second sub pixel area SP2 to form an inclined surface at the lower right and left, and the even vertical pixel line PL2 is formed. It is characterized in that the first light emitting area EA1 corresponding to , overlaps with the array irradiation provided in the first sub pixel area SP1 , so that the left, top, right and bottom inclined surfaces are formed.

11A and 11B , in the case of the organic light emitting diode according to the seventh embodiment of the present invention, the array element A1 of the first and second light emitting areas EA1 and EA2 of the odd horizontal pixel line SPL1 is , A2) is the same as the fifth embodiment, and the first and second light emitting areas EA1 and EA2 of the even-numbered horizontal pixel line SPL2 overlap with the array elements A1 and A2 in the seventh embodiment. It is characterized by having the same configuration as the example.

12A and 12B , in the case of the organic light emitting diode according to the eighth embodiment of the present invention, the array element A1 of the first and second light emitting areas EA1 and EA2 of the odd horizontal pixel line SPL1 is , A2) is the same as that of the fifth embodiment, and the overlapping arrangement of the first and second light emitting areas EA1 and EA2 of the even-numbered horizontal pixel line SPL2 with the array elements A1 and A2 is the same as in the second embodiment. It is characterized by having the same configuration as the example.

The organic electroluminescent device according to the third to eighth embodiments of the present invention having such a configuration is also formed in the entire display area in the same way as the organic electroluminescent device according to the first embodiment of the present application (100 in FIG. 2 ). The first light emitting area EA1 corresponding to the first ratio among all the first light emitting areas EA1 and the second light emitting area EA2 corresponding to the third ratio among all the second light emitting areas EA2 are inclined surfaces of upper left, lower right and lower left. and the first light emitting area EA1 corresponding to the second ratio remaining except for the first ratio and the second light emission area EA2 corresponding to the fourth ratio remaining except for the third ratio are inclined surfaces of the lower right and left. Therefore, the same effect as that of the organic electroluminescent device ( 100 in FIG. 2 ) according to the first embodiment is realized.

On the other hand, in the case of the organic electroluminescent device according to the first to eighth embodiments of the present application, the array elements A1 , A2 , A3 provided in each pixel region P1 , P2 , P3 , P4 are each part in a plan view. It has a configuration formed for each pixel area SP1, SP2, and SP3, so that the first light emitting area EA1 emitting red light and the second light emitting area EA2 emitting green light are formed in the first and second sub pixel areas SP1. , SP2), each pixel area P1, P2, P3, P4 of the first and second light emitting areas EA1 and EA2 itself, depending on whether they overlap with the array elements A1, A2, A3 located in which part. It shows that the position within the

However, in the case of the organic light emitting device according to the first to eighth embodiments, the first and second light emitting regions EA1 and EA2 in each pixel region P1 , P2 , P3 , and P4 as respective modifications thereof. ), the same effect may be realized by disposing the array elements A1 and A2 overlapping the first and second light emitting areas EA1 and EA2 while being identically disposed.

13 to 20 are schematic plan views of four pixel regions adjacent to each other vertically, horizontally, horizontally and vertically of an organic electroluminescent device according to modified examples of each of the first to eighth embodiments of the present invention, in which the light emitting region and the array element are formed. Only the area to be covered is shown briefly.

As shown, in the case of the organic electroluminescent devices 101, 201, 301, 401, 501, 601, 701, and 801 according to the modified examples of each of the first to eighth embodiments, the third light-emitting region ( The array element A3 overlapping EA3 is located in the third sub-pixel area SP3 while the array elements A1 and A2 are connected to the first and second light-emitting areas EA1 and EA2 emitting red and green light. ) is formed over the first and second sub-pixel areas SP1 and SP2. In this case, the positions of the overlapping regions of the first and second light emitting areas EA1 and EA2 and the array elements A1 and A2 are the same as those of the organic light emitting diodes according to the first to eighth embodiments.

The organic electroluminescent devices 101 , 201 , 301 , 401 , 501 , 601 , 701 , and 801 according to the modified examples of the first to eighth embodiments having such a configuration include the first and second light emitting regions EA1 and EA2 . Since the positions are fixed equally in each of the pixel areas P1, P2, P3, and P4, the metal mask for forming the organic light emitting layer in the first and second light emitting areas EA1 and EA2 has the same opening position, so it is unified. Therefore, it is advantageous in terms of cost and post-metal mask management compared to manufacturing an organic light emitting device by having a metal mask having a different opening arrangement shape for each of the second and third light emitting areas EA2 and EA3, respectively. something to do.

Hereinafter, the cross-sectional structure of the organic electroluminescent device according to the first embodiment of the present invention having the above-described configuration will be described. In the case of the second to eighth embodiments of the present invention, the cross-sectional structure of the same part is the same as that of the organic electroluminescent device according to the first embodiment of the present invention, and thus a description thereof will be omitted.

3 and 4, as shown, the organic electroluminescent device 101 according to the first embodiment of the present invention includes an array element such as a driving and switching thin film transistor (DTr, not shown) and organic electroluminescence. Although not shown in the drawing, it is composed of a first substrate 110 on which the diode E is formed, and a second substrate (not shown) for encapsulation. In this case, the second substrate (not shown) may be omitted by being replaced with an inorganic insulating layer (not shown) or an organic insulating layer (not shown).

A buffer layer 103 is provided on an upper portion of the first substrate 102 made of a plastic or polymer material or glass material having a flexible property, and in the display area over the buffer layer 103, the gate insulating layer 116 and the interlayer A gate line (not shown) and a data line (not shown) are formed, intersecting each other with the insulating layer 123 interposed therebetween, defining sub-pixel regions SP1 and SP2 (not shown), and the gate wiring (not shown). Alternatively, a power line (not shown) is formed in parallel with the data line (not shown).

In addition, in the sub-pixel regions SP1 and SP2 (not shown), a switching thin film transistor (not shown) connected to the gate line (not shown) and the data line (not shown) is formed, and the switching thin film transistor (not shown) is formed. ) and connected to the power wiring (not shown), a driving thin film transistor (DTr) is formed.

At this time, the driving thin film transistor DTr is a polysilicon semiconductor layer ( 113), the gate insulating layer 116, the gate electrode 120 formed to overlap the active region 113a, and the semiconductor layer contact hole 125 exposing the source and drain regions 113b. It consists of an interlayer insulating film 123 and source and drain electrodes 133 and 136 formed to be spaced apart from each other while in contact with the source and drain regions 113b through the semiconductor layer contact hole 125, respectively. Although not shown, the switching thin film transistor (not shown) also has the same structure as the driving thin film transistor DTr.

On the other hand, in the organic electroluminescent device 100 according to the first embodiment of the present invention, the driving and switching thin film transistor (DTr, not shown) is configured to include the semiconductor layer 113 of the polysilicon, respectively, characterized in that Although forming the top gate structure is shown as an example, the configuration of the driving and switching thin film transistor (DTr, not shown) may be variously modified.

The switching and driving thin film transistor (not shown, DTr) includes a gate electrode, a gate insulating film, a semiconductor layer comprising an active layer of pure amorphous silicon and an ohmic contact layer of impurity amorphous silicon, a source spaced apart from each other on the semiconductor layer, and A stacked structure of the drain electrode may be achieved.

In addition, the switching and driving thin film transistor (not shown, DTr) has a gate electrode, a gate insulating layer, an oxide semiconductor layer, an etch stopper, and a source electrode and a drain spaced apart from each other on the etch stopper and in contact with the oxide semiconductor layer, respectively. It is also possible to achieve a laminated configuration of electrodes.

In this way, a switching and driving thin film transistor (DTr, not shown) having a configuration including a semiconductor layer made of amorphous silicon or oxide semiconductor material may form a bottom gate structure in which the gate electrode is located at the bottom, in this case, the gate wiring ( (not shown) is positioned below the gate insulating layer, and the data line (not shown) is positioned above the gate insulating layer.

Meanwhile, referring to FIGS. 3 and 4 , a protection having a drain contact hole 143 exposing the drain electrode 136 of the driving thin film transistor DTr to an upper portion of the driving and switching thin film transistor DTr (not shown) A layer 138 and a planarization layer 140 are formed.

At this time, the protective layer 138 _{is preferably made of silicon oxide (SiO 2} ) or silicon nitride (SiNx) as an inorganic insulating material, and the planarization layer 140 appropriately resolves the step difference located below it to have a flat surface. It is made of an organic insulating material, for example, photo acryl.

However, even if the planarization layer 140 is provided on the protective layer 138 in this way, the surface of the planarization layer 140 does not achieve a completely flat state, and a component substantially located below, that is, a switching and driving thin film transistor (not shown). The inclined surface is formed by the step portion caused by the array elements A1 and A2 (not shown) such as DTr).

That is, on the surface of the planarization layer 140 , in particular, the portion on which the array elements A1 and A2 (not shown) is formed is formed higher than that of the other regions, and the other portions are formed relatively low, so that the array elements A1, A2, It forms an inclined plane with the portion overlapping the city) as the upper side and the non-overlapping portion as the lower side.

In the drawing, it is shown that inclined surfaces of the first light emitting area EA1 are formed on the upper left, lower right and lower sides, and the second light emitting area EA2 has inclined surfaces on the upper right and lower left.

Next, on the planarization layer 140 provided with the drain contact hole 143, through the drain contact hole 143 and in contact with the drain electrode 136 of the driving thin film transistor DTr, the first, second and The first electrodes 150 are respectively formed to correspond to the third light emitting areas EA1 and EA2 (not shown).

The first electrode 150 is preferably made of a double-layer structure in view of the characteristics of being driven in the upper emission mode, the lower layer 150a is made of a metal material having excellent light reflectance, and the upper layer 150b has a relatively work function value. As the transparent conductive material having a large work function value of about 4.8 eV to 5.2 eV, for example, indium-tin-oxide (ITO), serves as the anode electrode.

Next, a bank 152 is formed at the boundary between the first, second, and third light emitting areas EA1 and EA2 (not shown). The bank 152 is characterized in that it exposes the first electrode 150 to correspond to the first, second, and third light emitting areas EA1, EA2, not shown.

In addition, in the first, second, and third light emitting areas EA1 and EA2 (not shown) surrounded by the bank 152 , an organic light emitting layer 155 emitting red, green, and blue light is emitted over the first electrode 150 , respectively. This is being provided.

At this time, in the drawing, the organic light emitting layer 155 emitting red (R) light is formed in the first light emitting area EA1, and the organic light emitting layer 155 which emits green (G) light is formed in the second light emitting area EA2. is formed, and the organic emission layer 155 emitting blue light (not shown) is formed in the third emission area EA3 as an example, but the organic emission layer 155 emitting blue light is formed in the first and second regions. and an organic light emitting layer 155 formed in common on the entire surface of the display area irrespective of the third light emitting areas EA1 and EA2 (not shown) and emitting blue light to the first and second light emitting areas EA1 and EA2. ) may form a configuration in which the organic light emitting layer 155 emitting red and green light is formed.

Meanwhile, although the drawing shows that the organic light emitting layer 155 is composed of a single layer made of only an organic light emitting material, it may have a multi-layer structure to increase luminous efficiency.

When the organic light emitting layer 155 has a multilayer structure, although not shown in the drawing, a hole injection layer and a hole transport layer are sequentially formed from the upper portion of the first electrode 150 serving as the anode electrode. A transporting layer, an organic light emitting material layer, an electron transporting layer, and an electron injection layer may be formed in a five-layer structure, or a hole transporting layer, an organic A four-layer structure of an emitting material layer, an electron transporting layer and an electron injection layer, a hole transporting layer, an organic emitting material layer, an electron transporting layer It may be formed in a triple-layer structure of (electron transporting layer).

Meanwhile, the organic light emitting layer 155 emitting red and green light provided in the first and second light emitting areas EA1 and EA2 having such a configuration is influenced by the planarization layer 140 formed thereunder at a predetermined angle. One characteristic of the organic electroluminescent device 100 according to the first embodiment of the present invention is that it has an inclined surface of upper left, upper right, lower right, and lower left.

In addition, a second electrode 160 is formed on the organic emission layer 155 to correspond to the entire surface of the display area. The second electrode 160 is a metal material having a relatively low work function value, for example, aluminum (Al), aluminum alloy (AlNd), silver (Ag), magnesium (Mg), gold (Au), aluminum magnesium alloy (AlMg). ), it is characterized in that it serves as a cathode electrode.

In this case, the first electrode 150 , the organic light emitting layer 155 , and the second electrode sequentially stacked on each of the first, second and third light emitting areas EA1 , EA2 , not shown on the first substrate 110 . Reference numeral 160 constitutes an organic light emitting diode (E).

Meanwhile, a second substrate (not shown) for encapsulation may be further provided corresponding to the first substrate 102 of the organic electroluminescent device 101 according to the first embodiment of the present invention having the above-described configuration. have.

An adhesive (not shown) made of a sealant or frit is provided along the edges of the first substrate 102 and the second substrate (not shown), and the first substrate is formed by the adhesive (not shown). 102 and the second substrate (not shown) are bonded to each other to maintain the panel state.

In this case, a vacuum state or an inert gas atmosphere may be formed between the first substrate 102 and the second substrate (not shown) that are spaced apart from each other by being filled with an inert gas.

The second substrate (not shown) for the encapsulation may be made of a plastic or polymer material having flexible properties, or may be made of a glass material. Furthermore, the second substrate (not shown) may be configured to contact the second electrode 160 provided on the uppermost layer of the first substrate 102 in the form of a film including an adhesive layer.

In addition, an organic insulating layer (not shown) or an inorganic insulating layer (not shown) may be further provided on the second electrode 160 to form a capping layer (not shown), and the organic insulating layer (not shown) or inorganic insulating layer (not shown) may be used as an encapsulation film (not shown) by itself, and in this case, the second substrate (not shown) may be omitted.

The present invention is not limited to the above-described embodiments and modifications, and can be implemented with various modifications within the limits without departing from the spirit of the present invention.

100: organic electroluminescent device
A1, A2, A3: Array element
EL1, EL2, EL3: first, second and third light emitting regions
P1, P2, P3, P4: pixel area
PL1: odd vertical pixel line
PL2: Even vertical pixel line
R, G, B: red, green and blue light
SP1, SP2, SP3: first, second and third sub-pixel regions
SPL1: odd horizontal pixel line
SPL2: Even horizontal pixel line

Claims (11)

a substrate having a display area defined with a plurality of pixel areas each having first, second, and third light-emitting areas emitting light of three colors;
an array element formed to overlap the first, second, and third light emitting regions of each pixel region on the substrate;
An organic light emitting diode having a first electrode, an organic light emitting layer, and a second electrode that is sequentially stacked on the first, second and third light emitting regions on the array element.
wherein the first, second, and third light emitting regions are spaced apart from each other in each of the plurality of pixel regions, and a long axis direction of the first and second light emitting regions and a long axis direction of the third light emitting region are configured to be spaced apart from each other. is orthogonal to each other, and the first light emitting area corresponding to the first ratio among all the first light emitting areas provided in the display area is configured such that one side in the long axis direction overlaps the array element, except for the first ratio The remaining first light emitting region corresponding to the second ratio is configured such that the other side in the long axis direction overlaps the array element, and the second light emitting region corresponding to the third ratio among all the second light emitting regions provided in the display area is One side in the long axis direction is configured to overlap the array element, and the second light emitting region corresponding to the fourth ratio except for the third ratio is configured such that the other side in the long axis direction overlaps the array element. electroluminescent device.
The method of claim 1,
The first ratio and the third ratio have a value greater than 0 and less than 1, respectively, and the absolute value of the difference between the first ratio and the third ratio is 0 to 0.2.
3. The method of claim 2,
When the first ratio among the first ratio and the second ratio is greater than the second ratio, the third ratio among the third ratio and the fourth ratio is formed to be larger than the fourth ratio.
The method of claim 1,
An organic emission layer emitting red light is provided in the first emission region, an organic emission layer emitting green light is provided in the second emission region, and an organic emission layer emitting blue light is provided in the third emission region. organic electroluminescent device.
The method of claim 1,
An organic light emitting layer emitting blue light is provided on the entire surface of the display area, an organic light emitting layer emitting red light together with an organic light emitting layer emitting blue light is provided in the first light emitting area, and blue light emission is provided in the second light emitting area An organic light emitting device characterized in that an organic light emitting layer emitting green light is provided along with an organic light emitting layer.
The method of claim 1,
The pixel area is divided into first, second and third sub-pixel areas, and the array element is formed for each of the first, second, and third sub-pixel areas within each pixel area, and all Among the first and second emission regions, the first emission region corresponding to the first ratio and the second emission region corresponding to the third ratio overlap the array elements provided in the first sub-pixel region, and The first light emitting region corresponding to the second ratio and the second light emitting region corresponding to the fourth ratio overlap the array element provided in the second sub-pixel region.
7. The method of claim 6,
The positions of the array elements provided for each of the first, second, and third sub-pixel regions within each pixel region are fixed in the same manner for each pixel region, and one side or the other side overlaps the array element for each pixel region. An organic electroluminescent device characterized in that the positions of the first and second light emitting regions are different for each pixel region by the
The method of claim 1,
The pixel region is divided into first, second, and third sub-pixel regions, and the array element includes three first, second, and third array elements spaced apart from each other in each pixel region, and the first and third sub-pixel regions The second array element is configured to correspond to the first and second sub-pixel regions, respectively, and the third array element is configured to correspond to the third sub-pixel region, respectively.
9. The method of claim 8,
First and second arrays in which the positions of the first, second, and third light emitting regions provided in each pixel region are identically fixed for each pixel region, and overlap the first and second light emitting regions for each pixel region An organic electroluminescent device characterized in that the position of the device is different for each pixel area.
The method of claim 1,
The array element is an organic electroluminescent device, characterized in that it comprises a switching thin film transistor and a driving thin film transistor.
11. The method of claim 10,
A planarization layer covering the array element and having a drain contact hole exposing one electrode of the driving thin film transistor is provided, and the first electrode contacting the first electrode of the driving thin film transistor through the drain contact hole is provided on the planarization layer. 1 electrode is provided, and the planarization layer forms an inclined surface in the first and second light emitting regions with a portion overlapping the array element as an upper portion and a portion not overlapping with the array element as a lower portion in the first and second light emitting regions electroluminescent device.

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