KR20200081194A - Display device - Google Patents

Abstract

According to an embodiment of the present application, a display device comprises: a substrate having a first sub-pixel, and a second sub-pixel adjacent to the first sub-pixel; a first electrode provided on the substrate and including a first sub-electrode provided in the first sub-pixel, and a second sub-electrode provided in the second sub-pixel; an organic light emitting layer including a first organic light emitting layer disposed on the first sub-electrode, and a second organic light emitting layer disposed on the second sub-electrode; a second electrode disposed on the organic light emitting layer; and a first bank provided between the first sub-electrode and the second sub-electrode to distinguish the first sub-pixel from the second sub-pixel. The first organic light emitting layer includes a light emitting layer and a first hole transporting layer arranged on the light emitting layer. The first hole transporting layer includes a first sub-hole transporting layer and a second sub-hole transporting layer. The first sub-hole transporting layer of the first hole transporting layer covers the light emitting layer between the light emitting layer and the second sub-hole transporting layer. The organic light emitting layer can be prevented from being damaged by an exposure process or a solution process, so that a defect rate of the complete display device can be reduced.

Description

Display device {DISPLAY DEVICE}

The present application relates to a display device for displaying an image.

As the information society develops, the demand for display devices for displaying images is increasing in various forms. Accordingly, in recent years, various display devices such as liquid crystal display devices, light emitting display devices, organic light emitting display devices, micro light emitting display devices, and quantum dot light emitting display devices have been utilized.

In the case of forming red, green, and blue pixels of the organic light emitting layer, the organic light emitting display device can manufacture a small/medium sized panel by a mask shadow as a problem of sagging of a deposition mask when using FMM technology, but it is difficult to apply a large area. In addition, even when the panel is manufactured using the FMM, there is a limit in reducing the size of each pixel, which makes it difficult to apply ultra-high resolution.

An object of the present application is to provide a display device capable of preventing deterioration of device characteristics of an organic light emitting layer.

A display device according to an exemplary embodiment of the present application includes a substrate having a first sub-pixel and a second sub-pixel adjacent to the first sub-pixel, a first sub-electrode provided on the substrate, and a first sub-electrode provided in the first sub-pixel. An organic light emitting layer and an organic light emitting layer including a first electrode including a second sub electrode provided in 2 sub pixels, a first organic light emitting layer disposed on the first sub electrode, and a second organic light emitting layer disposed on the second sub electrode. A second electrode disposed on the first electrode, and a first bank provided between the first sub-electrode and the second sub-electrode to distinguish the first sub-pixel and the second sub-pixel, the first organic light emitting layer includes a light emitting layer and an emission layer And a first hole transport layer, the first hole transport layer includes a first sub hole transport layer and a second sub hole transport layer, and the first sub hole transport layer of the first hole transport layer is between the light emitting layer and the second sub hole transport layer. In may be provided to cover the light emitting layer.

The display device according to the present application is provided with a first sub hole transport layer so as to cover the light emitting layer of the organic light emitting layer, thereby preventing the organic light emitting layer from being damaged by an exposure process or a solution process, thereby reducing the defective rate of the completed display device. .

In addition to the effects of the present application mentioned above, other features and advantages of the present application are described below, or will be clearly understood by those skilled in the art from the description and description.

1 is a schematic cross-sectional view of a display device according to a first exemplary embodiment of the present application.
2A to 2P are schematic manufacturing process cross-sectional views of a display device according to a first embodiment of the present application.
3 is a schematic structural diagram of part A of FIG. 1.
4 is a graph showing a ratio of oxygen included in the first sub hole transport layer and the second sub hole transport layer of FIG. 3.
5 is a schematic structural diagram of part B of FIG. 3.
6 is a graph showing a voltage change according to driving of the organic light emitting layer of the display device according to the first embodiment of the present application.
7 is a graph showing an improvement in the life of the organic light emitting layer of the display device according to the first embodiment of the present application.
8 is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present application.
9 is a schematic cross-sectional view of a display device according to a third exemplary embodiment of the present application.
10A to 10J are schematic manufacturing process cross-sectional views of a display device according to a third embodiment of the present application.
11 is a schematic cross-sectional view of a display device according to a fourth exemplary embodiment of the present application.
12A to 12P are schematic manufacturing process cross-sectional views of a display device according to a fourth embodiment of the present application.
13 is a graph showing an improvement in the life of the organic light emitting layer of the display device according to the fourth embodiment of the present application.
14 is a schematic cross-sectional view of a display device according to a fifth exemplary embodiment of the present application.
15A to 15P are schematic manufacturing process cross-sectional views of a display device according to a fifth embodiment of the present application.
16A to 16C relate to a display device according to a sixth embodiment of the present application, which relates to a head mounted display (HMD) device.

Advantages and features of the present application, and a method of achieving them will be clarified with reference to examples described below in detail together with the accompanying drawings. However, the present application is not limited to the examples disclosed below, but will be implemented in various different forms, only the examples allow the disclosure of the present application to be complete, and to those skilled in the art to which this application belongs. It is provided to fully inform the scope of the invention, and this application is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining examples of the present application are exemplary, and the present application is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in the description of the present application, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present application, the detailed description will be omitted. When'include','have','consist of' and the like mentioned in the present application are used, other parts may be added unless'~man' is used. When a component is expressed as a singular number, the plural number is included unless otherwise specified.

In interpreting the components, it is interpreted as including the error range even if there is no explicit description.

In the case of the description of the positional relationship, for example, when the positional relationship of two parts is described as'~top','~upper','~bottom','~side', etc.,'right' Alternatively, one or more other parts may be located between the two parts unless'direct' is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, the first component mentioned below may be the second component within the technical spirit of the present application.

In describing the components of the present application, terms such as first and second may be used. These terms are only for distinguishing the component from other components, and the essence, order, order, or number of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected to or connected to the other component, but different components between each component It should be understood that the "intervenes", or each component may be "connected", "coupled" or "connected" through other components.

Each of the features of the various examples of the present application may be partially or totally combined or combined with each other, technically various interlocking and driving may be possible, and each of the examples may be independently implemented with respect to each other or may be implemented together in an associative relationship. .

Hereinafter, an example of a display device according to the present application will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, the same components may have the same reference numerals as possible even though they are displayed on different drawings.

1 is a schematic cross-sectional view of a display device according to a first embodiment of the present application, and FIGS. 2A to 2P are schematic manufacturing process cross-sectional views of a display device according to the first embodiment of the present application.

1 to 2p, the display device 1 according to the first exemplary embodiment of the present application includes a substrate 2, a circuit element layer 3, a first electrode 4, a first bank 5, It includes an organic light emitting layer 6, a second electrode 7, an encapsulation layer 8, and a second bank (9). The organic light emitting layer 6 includes a light emitting layer and a first hole transport layer, the first hole transport layer includes a first sub hole transport layer and a second sub hole transport layer, and the first sub hole transport layer includes the light emitting layer and the first The light emitting layer is disposed between the two sub hole transport layers.

The substrate 2 may be a plastic film, a glass substrate, or a semiconductor substrate such as silicon. The substrate 2 may be made of a transparent material or an opaque material.

A first sub-pixel 21, a second sub-pixel 22, and a third sub-pixel 23 are provided on the substrate 2. The second sub-pixel 22 according to an example may be disposed adjacent to one side of the first sub-pixel 21. The third sub-pixel 23 according to an example may be disposed adjacent to one side of the second sub-pixel 22. Accordingly, the first sub-pixel 21, the second sub-pixel 22, and the third sub-pixel 23 may be sequentially disposed on the substrate 2.

The first sub-pixel 21 emits red (R) light, the second sub-pixel 22 emits green (G) light, and the third sub-pixel 23 emits blue (B) light. It may be provided to emit light, but is not limited thereto, and may emit light of various colors including white. In addition, the arrangement order of each of the sub-pixels 21, 22 and 23 can be variously changed.

Each of the first sub-pixel 21, the second sub-pixel 22, and the third sub-pixel 23 includes a first electrode 4, an organic emission layer 6, and a second electrode 7 It may be provided. Here, the first electrode 4 may be a cathode electrode. In addition, the second electrode 7 may be an anode electrode. Accordingly, the display device 1 according to the first embodiment of the present application may be provided with a structure in which a cathode electrode is disposed at the bottom and an anode electrode is disposed at the top. The first electrode 4 may include a first sub-electrode 41, a second sub-electrode 42, and a third sub-electrode 43.

The display device 1 according to the first embodiment of the present application is made of a so-called top emision method in which the emitted light is emitted toward the top, and thus, the material of the substrate 2 is not only a transparent material. Opaque materials can be used.

The circuit element layer 3 is provided on one surface of the substrate 2.

The circuit element layer 3 is provided with circuit elements including a plurality of thin film transistors 31, 32 and 33, various signal wires, and a capacitor for each sub-pixel 21, 22 and 23. The signal wires may include a gate line, a data line, a power line, and a reference line, and the thin film transistors 31, 32, and 33 may include a switching thin film transistor, a driving thin film transistor, and a sensing thin film transistor. have. The sub-pixels 21, 22, and 23 are defined by a cross structure of gate lines and data lines.

The switching thin film transistor is switched according to a gate signal supplied to the gate line and serves to supply a data voltage supplied from the data line to the driving thin film transistor.

The driving thin film transistor is switched according to the data voltage supplied from the switching thin film transistor to generate a data current from the power supplied from the power line and serves to supply the first electrode 4.

The sensing thin film transistor serves to sense a threshold voltage deviation of the driving thin film transistor that causes a deterioration in image quality, and the current of the driving thin film transistor is responsive to a sensing control signal supplied from the gate line or a separate sensing line. Is supplied to the reference line.

The capacitor serves to maintain the data voltage supplied to the driving thin film transistor for one frame, and is connected to the gate terminal and the source terminal of the driving thin film transistor, respectively.

The first transistor 31, the second transistor 32, and the third transistor 33 are arranged in the circuit element layer 3 for each sub-pixel 21, 22, 23. The first transistor 31 according to an example is connected to the first sub-electrode 41 disposed on the first sub-pixel 21 to drive light of a color corresponding to the first sub-pixel 21 Voltage can be applied.

The second transistor 32 according to an example is connected to the second sub-electrode 42 disposed on the second sub-pixel 22 to drive light of a color corresponding to the second sub-pixel 22. Voltage can be applied.

The third transistor 33 according to an example is connected to the third sub-electrode 43 disposed on the third sub-pixel 23 to drive light of a color corresponding to the third sub-pixel 23. Voltage can be applied.

Each of the first sub-pixel 21, the second sub-pixel 22, and the third sub-pixel 23 according to an example, the gate signal is input from the gate line using each of the transistors 31, 32, 33 If possible, a predetermined current is supplied to the organic light emitting layer according to the data voltage of the data line. Accordingly, the organic emission layers of the first sub-pixel 21, the second sub-pixel 22, and the third sub-pixel 23 may emit light with a predetermined brightness according to a predetermined current.

The first electrode 4 is formed on the circuit element layer 3. The first electrode 4 according to an example is made of aluminum, aluminum and titanium (Ti/Al/Ti), aluminum and ITO (ITO/Al/ITO), APC alloy, and APC alloy and ITO. It may be formed of a metal material having a high reflectance, such as a layered structure (ITO/APC/ITO). APC alloys are alloys of silver (Ag), palladium (Pb), and copper (Cu). The first electrode 4 may be a cathode. The first electrode 4 may include a first sub-electrode 41, a second sub-electrode 42, and a third sub-electrode 43.

The first sub-electrode 41 may be provided in the first sub-pixel 21. The first sub-electrode 41 may be formed on the circuit element layer 3. The first sub-electrode 41 is connected to the source electrode of the first transistor 31 through a contact hole passing through the circuit element layer 3.

The second sub-electrode 42 may be provided in the second sub-pixel 22. The second sub-electrode 42 may be formed on the circuit element layer 3. The second sub-electrode 42 is connected to the source electrode of the second transistor 32 through a contact hole passing through the circuit element layer 3.

The third sub-electrode 43 may be provided in the third sub-pixel 23. The third sub-electrode 43 may be formed on the circuit element layer 3. The third sub-electrode 43 is connected to the source electrode of the third transistor 33 through a contact hole passing through the circuit element layer 3.

Here, the first to third transistors 31, 32, and 33 may be N-type TFTs.

If the first to third transistors 31, 32, and 33 are provided as P-type TFTs, each of the first to third sub-electrodes 41, 42, and 43 is the first to third transistors. Transistors 31, 32, and 33 may be connected to respective drain electrodes.

That is, each of the first to third sub-electrodes 41, 42 and 43 may be connected to a source electrode or a drain electrode according to the type of the first to third transistors 31, 32 and 33.

The display device 1 according to the first embodiment of the present application is made of an upper emission method, and thus, the first to third sub-electrodes 41, 42 and 43 emit light emitted from the organic emission layer 6. It may be made of a reflective material for reflecting upwards. In this case, the first to third sub-electrodes 41, 42, and 43 may be formed of a stacked structure of a transparent electrode formed of a transparent conductive material and a reflective electrode formed of the reflective material. Although not shown, a separate transparent electrode is additionally provided below the reflective electrode, so that each of the first to third sub-electrodes 41, 42, and 43 is a separate transparent electrode, a reflective electrode, and a transparent electrode in turn. It may be made of a stacked three-layer structure.

At this time, the reflective electrode provided in the first sub-pixel 21, the reflective electrode provided in the second sub-pixel 22, and the reflective electrode provided in the third sub-pixel 23 are all made of the same material. It may be formed to have the same thickness.

Similarly, the transparent electrode provided in the first sub-pixel 21, the transparent electrode provided in the second sub-pixel 22, and the transparent electrode provided in the third sub-pixel 23 are all made of the same material. It may be formed to have a thickness. However, the present invention is not limited thereto, and the thickness of the transparent electrodes provided in each of the sub-pixels 21, 22 and 23 to adjust the separation distance of the sub-electrodes 41, 42 and 43 with respect to the second electrode 7 May be different from each other. For example, when the display device is implemented using microcavity characteristics, the thickness of the transparent electrodes may be different from each other. The micro-cavity characteristic is that the distance between the reflective electrode of the first electrode 4 and the second electrode 7 is a half wavelength (λ/2) of light emitted from each sub-pixel 21, 22, 23. When it is an integer multiple, reinforcement interference occurs to amplify the light, and when the above reflection and re-reflection processes are repeated, the degree of amplification of light continuously increases, thereby improving the external extraction efficiency of light. When the display device is implemented to have micro-cavity characteristics, the second electrode 7 may include a translucent electrode.

In order to implement the above-described micro-cavity characteristics, the display device 1 according to the first embodiment of the present application may include the thicknesses of the first sub-hole transport layer of the organic light-emitting layer from the first to third sub-pixels 21 and 22, 23) The distance between the first electrode 4 and the second electrode 7 can be adjusted differently by providing differently. A detailed description of this will be given in the display device 1 according to the second embodiment of the present application, which will be described later.

Referring to FIG. 1 again, the first bank 5 is provided between the first sub-electrode 41 and the second sub-electrode 42. The first bank 5 according to an example is for distinguishing the first sub-pixel 21 from the second sub-pixel 22. The first bank 5 is provided to cover the edges of the first sub-electrode 41 and the second sub-electrode 42, thereby distinguishing the first sub-pixel 21 from the second sub-pixel 22. Can. The first bank 5 serves to define a sub-pixel, that is, a light emitting unit. In addition, since the region in which the first bank 5 is formed does not emit light, it may be defined as a non-light emitting unit. The first bank 5 is formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamise resin, or a polyimide resin. Can. The organic emission layer 6 is formed on the first electrode 4 and the first bank 5.

Referring to FIG. 1, the first bank 5 may include an upper surface 51 and an inclined surface 52. The inclined surface 52 may include a first inclined surface 521 and a second inclined surface 522.

The upper surface 51 of the first bank 5 is a surface positioned above the first bank 5.

The first inclined surface 521 of the first bank 5 is a surface extending from the upper surface 51 to the upper surface 41a of the first sub-electrode 41. Accordingly, the first inclined surface 521 and the upper surface 41a of the first sub-electrode 41 may form a predetermined angle. The predetermined angle may be 50° or more and less than 90° because the width of the bank is narrowed as the display device is implemented in high resolution. The width of the bank may be narrowed as the spacing between sub-pixels is narrowed.

The second inclined surface 522 of the first bank 5 is a surface extending from the upper surface 51 to the upper surface 42a of the second sub-electrode 42. Accordingly, the second inclined surface 522 and the upper surface 42a of the second sub-electrode 42 may form a predetermined angle. The angle formed by the second inclined surface 522 and the upper surface 42a of the second sub-electrode 42 is equal to the angle formed by the first inclined surface 521 and the upper surface 41a of the first sub-electrode 41. It can be the same.

Referring to FIG. 1, the display device 1 according to the first embodiment of the present application may further include a second bank 9.

The second bank 9 is provided between the second sub-electrode 42 and the third sub-electrode 43. The second bank 9 according to an example is provided to cover the edges of each of the second sub-electrode 42 and the third sub-electrode 43, so that the second sub-pixel 22 and the third sub-pixel 23 are provided. Can be distinguished. The second bank 9 serves to define a sub-pixel, that is, a light emitting unit. In addition, the region where the second bank 9 is formed does not emit light, and thus may be defined as a non-light emitting unit. The second bank 9 may be formed of the same material as the first bank 5. The organic light emitting layer 6 is formed on the first electrode 4 and the second bank 9.

Referring to FIG. 1, the second bank 9 may include an upper surface 91 and an inclined surface 92. The inclined surface 92 may include a first inclined surface 921 and a second inclined surface 922.

The upper surface 91 of the second bank 9 is a surface positioned above the second bank 9.

The first inclined surface 921 of the second bank 9 is a surface extending from the upper surface 91 to the upper surface 42a of the second sub-electrode 42. Accordingly, the upper surface 42a of the first inclined surface 921 and the second sub-electrode 42 may form a predetermined angle. The predetermined angle may be 50° or more and less than 90° because the width of the bank is narrowed as the display device is implemented in high resolution.

The second inclined surface 922 of the second bank 9 is a surface extending from the upper surface 91 to the upper surface 43a of the third sub-electrode 43. Accordingly, the upper surface 43a of the second inclined surface 922 and the third sub-electrode 43 may achieve a predetermined angle. The angle formed by the second inclined surface 922 and the upper surface 43a of the third sub-electrode 43 is equal to the angle formed by the first inclined surface 921 and the upper surface 42a of the second sub-electrode 42. It can be the same.

The organic light emitting layer 6 is disposed on the first electrode 4. The organic light emitting layer 6 according to an example includes an electron injecting layer (EIL), an electron transporting layer (ETL), a light emitting layer (EML), a hole transporting layer (HTL), And a hole injecting layer (HIL). The hole transport layer (HTL) is a first hole transport layer including a first sub hole transport layer disposed on an upper surface of the emission layer EML and a second sub hole transport layer disposed on an upper surface of the first sub hole transport layer, and the first It may be provided as a second hole transport layer disposed on the top surface of the hole transport layer. The electron injection layer (EIL) may cover both a layer made of an EIL material and a layer doped with ETL and having electron injection properties. A layer doped with the ETL and having electron injection characteristics may be an N-doped electron transport layer. The N-doped electron transport layer is obtained by plating a metal material such as lithium, cesium and magnesium on the electron transport layer. The N-doped electron transport layer may function as an electron injecting layer (EIL). Therefore, the display device 1 according to the first embodiment of the present application may be provided with an N-doped electron transport layer instead of the electron injection layer (EIL).

The hole injection layer (HIL), the hole transport layer (HTL), the electron transport layer (ETL), and the electron injection layer (EIL) of the organic light emitting layer 6 are for improving the luminous efficiency of the light emitting layer (EML), the hole transport layer ( The HTL) and the electron transport layer (ETL) are for balancing electrons and holes, and the hole injection layer (HIL) and the electron injection layer (EIL) are for enhancing the injection of electrons and holes.

More specifically, the hole injection layer HIL may facilitate hole injection by lowering an injection energy barrier of holes injected from the anode material, that is, the second electrode 7. The hole transport layer (HTL) serves to transport holes to the light emitting layer without loss of holes injected from the anode.

The emission layer (EML) is a layer that emits light through recombination of holes injected from the anode and electrons injected from the cathode, and can emit red, blue, and green light according to the binding energy in the emission layer. It is also possible to form a white light emitting layer. The electron injection layer (EIL) lowers the potential barrier during electron injection to facilitate injection of electrons from the cathode, that is, the first electrode 4. The electron transport layer ETL transports electrons injected from the electron injection layer EIL to the light emitting layer EML.

When a high potential voltage is applied to the first electrode 4 and a low potential voltage is applied to the second electrode 7, holes and electrons are moved to the light emitting layer through the hole transport layer and the electron transport layer, respectively, and the light emitting layers combine to emit light. do. Here, since the first electrode 4 is a cathode electrode, a negative voltage may be applied.

The organic emission layer 6 may include a first organic emission layer 61, a second organic emission layer 62, and a third organic emission layer 63.

The first organic emission layer 61 may be disposed on the first sub-electrode 41. The first organic emission layer 61 may be formed on the first sub-electrode 41 after the first electrode 4, the first bank 5, and the second bank 9 are formed.

The first organic light emitting layer 61, as shown in Figure 1, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, the first sub hole transport layer 6161 and the second sub hole transport layer ( 6142) may include a first hole transport layer 614, a second hole transport layer 615, and a hole injection layer 616. A first hole transport layer 614 including the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, the first sub hole transport layer 6161 and the second sub hole transport layer 6142, The second hole transport layer 615 and the hole injection layer 616 may be sequentially formed in the first sub-pixel 21.

Here, in the display device 1 according to the first embodiment of the present application, the first sub hole transport layer 6161 of the first hole transport layer 614 of the first organic emission layer 61 includes a light emitting layer 613 and a second It may be provided to cover the light emitting layer 613 between the sub-hole transport layer (6142).

Since the first sub hole transport layer 6161 covers the light emitting layer 613, the patterning process is performed such that the first sub hole transport layer 6161 and the light emitting layer 613 are disposed only in the first sub pixel 21, The first sub hole transport layer 6161 may prevent the light emitting layer 613 from being damaged from UV light used in the exposure process of the patterning process, etching gas used in the dry etching process, stripper solution used in the strip process, and the like. have.

The display device 1 according to the first embodiment of the present application includes a first between the light emitting layer 613 and the second sub hole transport layer 6142 or between the light emitting layer 613 and the second hole transport layer 615. A layer other than the sub hole transport layer 6161 may be disposed, but in this case, since the difference in energy level is greater than that in the case where the first sub hole transport layer 6161 is disposed, the light emission efficiency of the light emitting layer 613 may be lowered. .

On the other hand, in the display device 1 according to the first embodiment of the present application, the second sub hole transport layer 6142 of the first organic light emitting layer 61, the second hole transport layer 615, and the hole injection layer 616 ) May be deposited over the first sub-pixel 21 as well as the second sub-pixel 22 and the third sub-pixel 23. That is, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 have the second sub hole transport layer of the second organic emission layer 62. , The second hole transport layer, and the hole injection layer are connected to each other, and the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the second organic light emitting layer 62 have a third organic light emitting layer (63) has Each of the 2 sub hole transport layer, the second hole transport layer, and the hole injection layer may be connected to each other.

Accordingly, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 may be formed of the second organic emission layer 62 as shown in FIG. 1. The second sub hole transport layer, the second hole transport layer, and the hole injection layer may be the second sub hole transport layer of the third organic light emitting layer 63, the second hole transport layer, and the hole injection layer. As a result, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 are the display device 1 according to the first embodiment of the present application In can be arranged as a common layer.

As the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 are disposed as a common layer, the first sub pixel 21 and the second sub pixel 21 Not only can the upper surface 51 and the inclined surface 52 of the first bank 5 disposed between the sub-pixels 22 be covered, but also disposed between the second sub-pixel 22 and the third sub-pixel 23 The upper surface 91 and the inclined surface 92 of the second bank 9 may be covered.

As a result, the display device 1 according to the first embodiment of the present application includes the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the first to third organic light emitting layers 61, 62, and 63, respectively. Compared to the case of patterning for each of the first to third sub-pixels 21, 22 and 23, the number of manufacturing processes may be reduced.

Meanwhile, both ends of the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 disposed in the first sub pixel 21 may be provided to coincide with each other. .

More specifically, the light emitting layer 613 of the first organic light emitting layer 61 is first to first after the electron injection layer 611 and the electron transport layer 612 of the first organic light emitting layer 61 are all deposited as a common layer. The entire surface may be deposited over three sub-pixels 21, 22, and 23. Then, after the first sub hole transport layer 6161 is entirely deposited on the top surface of the light emitting layer 613 of the first organic emission layer 61, the electron injection layer 611 and the electron transport layer 612 of the first organic emission layer 61 ), the light emitting layer 613, and the first sub hole transport layer 6161 may be patterned to be disposed only in the first sub pixel 21.

As described above, since the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 of the first organic emission layer 61 are simultaneously patterned, the first organic emission layer ( 61, both ends of the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 may be embodied as shown in FIG. 1. Accordingly, the display device 1 according to the first embodiment of the present application includes an electron injection layer 611, an electron transport layer 612, a light emitting layer 613, and a first sub hole transport layer (1) of the first organic emission layer 61 ( By patterning 6141) simultaneously, it is possible to reduce the number of manufacturing processes compared to the case where the electron injection layer, the electron transport layer, the light emitting layer, and the first sub hole transport layer are respectively patterned, and each layer is exposed for the patterning process, By reducing the degree of exposure to the etching gas and the strip solution, it may be provided to prevent the luminous efficiency of the entire first organic light-emitting layer 61 is lowered.

Next, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 of the first organic emission layer 61 patterned on the first sub pixel 21 are covered. The second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 may be sequentially deposited as a common layer. Accordingly, the second sub hole transport layer 6142 of the first organic light emitting layer 61 includes top and both sides of the first sub hole transport layer 6161, both sides of the emission layer 613, and both sides of the electron transport layer 612. , And both side surfaces of the electron injection layer 611.

Here, the second sub hole transport layer 6142 of the first organic light emitting layer 61 is made of the same material as the first sub hole transport layer 6161 disposed on the upper side of the layer on which the patterning process is performed, thereby providing the patterning process. Accordingly, the first sub hole transport layer 6161 may be compensated. Here, the compensation may mean forming the second sub hole transport layer 6142 by the thickness of the first sub hole transport layer 6161 lost by the patterning process, and the energy level changed by the patterning process It may also mean that the energy level difference from the 1 sub hole transport layer 6161 is reduced.

Referring to FIG. 1 again, the second organic emission layer 62 may be disposed on the second sub-electrode 42. The second organic light emitting layer 62, like the first organic light emitting layer 61, after the first electrode 4, the first bank 5, and the second bank 9 are formed, the second sub-electrode 42 ). The second organic light emitting layer 62 may be formed after the first organic light emitting layer 61 is formed, but is not limited thereto.

The second organic light emitting layer 62 includes a first hole transport layer, an electron injection layer 621, an electron transport layer 622, a light emitting layer 623, a first sub hole transport layer 6251 and a second sub hole transport layer. 2 may include a hole transport layer, and a hole injection layer. A first hole transport layer, a first hole transport layer, including the electron injection layer 621, the electron transport layer 622, the light emitting layer 623, the first sub hole transport layer 6221 and the second sub hole transport layer of the second organic light emitting layer 62 The 2 hole transport layer and the hole injection layer are sequentially formed in the second sub pixel 22, and as described above, the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the second organic light emitting layer 62 are The second sub hole transport layer 6142 of the first organic light emitting layer 61, the second hole transport layer 615, and the hole injection layer 616 may be connected to each of them to be disposed as a common layer. Therefore, as shown in FIG. 1, the second sub-pixel 22 includes a second sub-hole transport layer 6142, a second hole transport layer 615, and a hole injection layer 616 of the first organic emission layer 61. Arranged as the common layer, the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the second organic light emitting layer 62 may function.

The electron injection layer 621, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6221 of the second organic emission layer 62 disposed on the second sub pixel 22 have both ends. It can be provided to match each other.

More specifically, the light emitting layer 623 of the second organic light emitting layer 62 is the first to the first after the electron injection layer 621 and the electron transport layer 622 of the second organic light emitting layer 62 are deposited as a common layer. The entire surface may be deposited over three sub-pixels 21, 22, and 23. Then, after the first sub hole transport layer 6201 is entirely deposited on the top surface of the light emitting layer 623 of the second organic light emitting layer 62, the electron injection layer 621 of the second organic light emitting layer 62, the electron transport layer 622 ), the light emitting layer 623, and the first sub hole transport layer 6201 may be patterned to be disposed only in the second sub pixel 22.

As described above, since the electron injection layer 621 of the second organic light emitting layer 62, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6421 are simultaneously patterned, the second organic light emitting layer ( Both ends of the electron injection layer 621, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6251 may be embodied as shown in FIG. 1. Therefore, the display device 1 according to the first embodiment of the present application includes the electron injection layer 621 of the second organic light emitting layer 62, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer ( By simultaneously patterning 6241), not only can the number of manufacturing processes be reduced compared to the case where the electron injection layer, the electron transport layer, the light emitting layer, and the first sub hole transport layer are respectively patterned, but each layer is exposed for the patterning process, By reducing the degree of exposure to the etching gas and the strip solution, it may be provided to prevent the luminous efficiency of the entire second organic light emitting layer 62 is lowered.

Next, the electron injection layer 621, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6221 of the second organic emission layer 62 patterned on the second sub pixel 22 are covered. The second sub hole transport layer, the second hole transport layer, and the hole injection layer of the second organic light emitting layer 62 may be sequentially deposited. Here, the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the second organic light emitting layer 62, as described above, the second sub hole transport layer 6142, the second of the first organic light emitting layer 61 Since the hole transport layer 615 and the hole injection layer 616 are connected to each other, the second sub-pixel 22 includes a second sub-hole transport layer 6142 of the first organic emission layer 61, a second hole transport layer 615, And a hole injection layer 616 may be disposed. Accordingly, the second sub hole transport layer 6142 of the first organic light emitting layer 61 includes top and both sides of the first sub hole transport layer 6201 of the second organic light emitting layer 62, and both sides of the light emitting layer 623, It may be provided in a structure that covers both sides of the electron transport layer 622, and both sides of the electron injection layer 621.

Here, the second sub hole transport layer 6142 of the first organic light emitting layer 61 is the first sub of the second organic light emitting layer 62 disposed on the uppermost of the layers where the patterning process is performed in the second sub pixel 22. It is provided with the same material as the hole transport layer 6201, thereby compensating for the first sub hole transport layer 6161 lost by the patterning process. Here, the compensation means to form the second sub hole transport layer 6142 of the first organic light emitting layer 61 by the thickness of the first sub hole transport layer 6221 of the second organic light emitting layer 62 lost by the patterning process. It may mean that the energy level difference with the first sub-hole transport layer 6221, which has been changed in energy level by the patterning process.

The third organic emission layer 63 may be disposed on the third sub-electrode 43. In the third organic light emitting layer 63, the first electrode 4, the first bank 5, and the second bank 9 are the same as the first organic light emitting layer 61 and the second organic light emitting layer 62. After being formed, it may be formed on the third sub-electrode 43. The third organic light emitting layer 63 may be formed after the first organic light emitting layer 61 and the second organic light emitting layer 62 are formed, but is not limited thereto.

The third organic light emitting layer 63 is a first hole transport layer, including an electron injection layer 631, an electron transport layer 632, a light emitting layer 633, a first sub hole transport layer 6301 and a second sub hole transport layer 2 may include a hole transport layer, and a hole injection layer. A first hole transport layer, a first hole transport layer, including the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, the first sub hole transport layer 6321 and the second sub hole transport layer of the third organic emission layer 63 The 2 hole transport layer and the hole injection layer may be sequentially formed in the third sub-pixel 23. Here, the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the third organic light emitting layer 63 are the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the second organic light emitting layer 62, respectively. And can be connected. As a result, as illustrated in FIG. 1, the third sub-pixel 23 includes a second sub-hole transport layer 6142, a second hole transport layer 615, and a hole injection layer 616 of the first organic emission layer 61. ) Is disposed as a common layer to perform the functions of the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the third organic light emitting layer 63.

The electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 631 of the third organic emission layer 63 disposed on the third sub pixel 23 have both ends of each other. Can be provided accordingly.

More specifically, the light emitting layer 633 of the third organic light emitting layer 63 is the first to the first after the electron injection layer 631 and the electron transport layer 632 of the third organic light emitting layer 63 are deposited as a common layer. The entire surface may be deposited over three sub-pixels 21, 22, and 23. Then, after the first sub hole transport layer 6321 is entirely deposited on the top surface of the emission layer 633 of the third organic emission layer 63, the electron injection layer 631 and the electron transport layer 632 of the third organic emission layer 63 ), the light emitting layer 633, and the first sub hole transport layer 6321 may be patterned to be disposed only in the third sub pixel 23.

As described above, since the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 631 of the third organic light emitting layer 63 are simultaneously patterned, the third organic light emitting layer ( Both ends of the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 631 may be embodied as shown in FIG. 1. Accordingly, the display device 1 according to the first embodiment of the present application includes the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer (3) of the third organic light emitting layer 63. By simultaneously patterning 6341), not only can the number of manufacturing processes be reduced compared to the case where the electron injection layer, the electron transport layer, the light emitting layer, and the first sub hole transport layer are respectively patterned, but each layer is exposed for the patterning process, By reducing the degree of exposure to the etching gas and the strip solution, it may be provided to prevent the luminous efficiency of the entire third organic light emitting layer 63 is lowered.

Next, the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 631 of the third organic emission layer 63 patterned on the third sub pixel 23 are covered. The second sub hole transport layer, the second hole transport layer, and the hole injection layer of the third organic light emitting layer 63 may be sequentially deposited. Here, the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the third organic light emitting layer 63, as described above, the second sub hole transport layer, the second hole transport layer of the second organic light emitting layer 62, And a second sub hole transport layer 6142 of the first organic emission layer 61, a second hole transport layer 615, and a hole injection layer 616 are disposed in the third sub pixel 23 because they are connected to the hole injection layer. Can be. Accordingly, the second sub hole transport layer 6142 of the first organic light emitting layer 61 includes top and both sides of the first sub hole transport layer 6321 of the third organic light emitting layer 63, and both sides of the light emitting layer 633, Both sides of the electron transport layer 632 and both sides of the electron injection layer 631 may be covered.

Here, the second sub hole transport layer of the third organic light emitting layer 63, that is, the second sub hole transport layer 6142 of the first organic light emitting layer 61 is the uppermost of the layers where the patterning process is performed in the third sub pixel 23 It is provided with the same material as the first sub hole transport layer 6321 of the third organic light emitting layer 63 disposed in, so that the first sub hole transport layer 631 lost by the patterning process may be compensated. Here, the compensation means that the second sub hole transport layer 6142 of the first organic emission layer 61 is formed by the thickness of the first sub hole transport layer 631 of the third organic emission layer 63 lost by the patterning process. It may mean that the energy level difference between the first sub-hole transport layer 6301 whose energy level is changed by the patterning process is reduced.

As a result, the display device 1 according to the first embodiment of the present application includes an electron injection layer 611, an electron transport layer 612, a light emitting layer 613, and a first sub hole transport layer of the first organic emission layer 61 (6141) is formed by patterning in the first sub-pixel 21, the electron injection layer 621 of the second organic light emitting layer 62, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer ( 6241 is formed by patterning in the second sub-pixel 22, the electron injection layer 631, the electron transport layer 632, the light-emitting layer 633 of the third organic light emitting layer 63, and the first sub hole transport layer 6431 ) Is formed after being patterned in the third sub-pixel 23, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic light emitting layer 61 serve as a common layer. It may be provided by being sequentially deposited.

Accordingly, the display device 1 according to the first exemplary embodiment of the present application includes the electron injection layers 611, 621, and 631, which are patterned and disposed in each of the first to third sub-pixels 21, 22, and 23, and the electron transport layer. (612, 622, 632), the light emitting layer (613, 623, 633), and the first sub hole transport layer (6141, 6241, 6341) by being provided to be spaced apart from each other, the second sub hole transport layer, the second hole transport layer, and the hole Although the injection layer is provided as a common layer connected to each other between the sub-pixels 21, 22 and 23, light of different colors may be emitted for each of the first to third sub-pixels 21, 22 and 23. For example, the first sub-pixel 21 emits red (R) light, the second sub-pixel 22 emits green (G) light, and the third sub-pixel 23 emits blue (B) light. It may be provided to emit light. However, the present invention is not necessarily limited thereto, and may be provided to emit light of various colors.

Each of the first organic emission layer 61, the second organic emission layer 62, and the third organic emission layer 63 emits red (R) light, green (G) light, and blue (B) light. When provided, the arrangement order of the first to third organic light emitting layers 61, 62 and 63 with respect to the first sub-electrodes 41, 42 and 43 may be variously combined. Each of the first organic emission layer 61, the second organic emission layer 62, and the third organic emission layer 63 emits red (R) light, green (G) light, and blue (B) light. Therefore, since the display device 1 according to the first embodiment of the present application may not use a color filter, an effect of reducing manufacturing cost can be expected.

As described above, the electron injection layers 611, 621, and 631 of the first to third organic light emitting layers 61, 62, and 63, electron transport layers 612, 622, 632, and light emitting layers 613, 623, and 633, respectively. ), and the first sub hole transport layer 6161, 6241, and 6341 may be formed by patterning each of the first to third sub pixels 21, 22, and 23. More specifically, each of the electron injection layer (611, 621, 631), electron transport layer (612, 622, 632), the light emitting layer (613, 623, 633), and the first sub-hole transport layer (6141, 6241, 6341) A shield layer (SL) and a photoresist (PR) are deposited on the top surfaces of the hole blocking layers 614, 624, and 634 deposited over the entire surface of the first to third sub pixels 21, 22, and 23. After sequentially stacking, each sub-pixel 21, 22, 23 may be patterned and formed through an exposure process, a dry etching process, or a strip process using a stripper solution.

Here, each light emitting layer 613 in the exposure process of exposing the photoresist PR disposed above the light emitting layers 613, 623, and 633 of the first to third organic light emitting layers 61, 62, and 63 to UV light. 623 and 633) may be damaged due to heat caused by UV light. The display device 1 according to the first embodiment of the present application is first to contact each of the light emitting layers 613, 623, and 633. By providing the sub hole transport layers 6161, 6241, and 6341, respectively, the first sub hole transport layers 6161, 6241, and 6341 may be provided to protect the light emitting layers 613, 623, and 633 from UV light. Therefore, since the display device 1 according to the first embodiment of the present application can prevent the light emitting layers 613, 623, and 633 from being damaged by UV light, it can be provided to reduce the defective rate of the completed display device. .

In addition, in the display device 1 according to the first embodiment of the present application, the first sub hole transport layers 6161, 6241, and 6341 are disposed on the top surfaces of the light emitting layers 613, 623, and 633, respectively, and thus the shield layer SL ) To prevent the etching gas or stripper solution from penetrating toward the light emitting layers 613, 623, and 633, thereby preventing the light emitting layers 613, 623, and 633 from being damaged by the etching gas or stripper solution. Here, the stripper solution may be at least one of a fluorine-based stripper solution and an aqueous stripper solution.

Referring to FIG. 1 again, the second electrode 7 is disposed on the organic emission layer 6. The second electrode 7 according to an embodiment may be an anode electrode, and is commonly formed in the first sub-pixel 21, the second sub-pixel 22, and the third sub-pixel 23. It is a common layer. The second electrode 7 is a transparent metal material (TCO, transparent conductive material) such as ITO or IZO that can transmit light, or magnesium (Mg), silver (Ag), or magnesium (Mg) and silver (ag) It may be formed of a semi-transmissive conductive material such as an alloy of.

An encapsulation layer 8 may be formed on the second electrode 7. The encapsulation layer 8 serves to prevent oxygen or moisture from penetrating the organic light emitting layer 6 and the second electrode 7. To this end, the encapsulation layer 8 may include at least one inorganic layer and at least one organic layer.

For example, the encapsulation layer 8 may include a first inorganic film, an organic film, and a second inorganic film. In this case, the first inorganic film is formed to cover the second electrode 7. The organic film is formed to cover the first inorganic film. The organic film is preferably formed to a sufficient length to prevent particles from entering the organic light emitting layer 6 and the second electrode 7 through the first inorganic film. The second inorganic film is formed to cover the organic film.

In FIG. 1, only the encapsulation layer 8 disposed on the second electrode 7 is illustrated for convenience of description. When the organic emission layer includes red, green, and blue emission layers that emit red (R), green (G), and blue (B) light, the red, green, and blue color filters are on the encapsulation layer 8. It may not be placed on.

2A to 2P are schematic manufacturing process cross-sectional views of a display device according to a first embodiment of the present application. In the display device 1 according to the first embodiment of the present application, the electron injection layers 611, 621, and 631 of the first to third organic light emitting layers 61, 62, and 63, and the electron transport layer ( 612, 622, 632), the light emitting layers 613, 623, 633, and both ends of the first sub hole transport layer 6161, 6241, 6341 can be matched, and the light emitting layers 613, 623, 633 have a top surface of each The first sub hole transport layer (6141, 6241, 6341) is disposed, respectively, so that the first sub hole transport layer (6141, 6241, 6341) protects each light emitting layer (613, 623, 633) from UV light, etching gas, and stripper solution. It may be provided.

2A to 2D, a first electrode 4, a first bank 5, and a second bank 9 as cathode electrodes are formed on the substrate 2 and the circuit element layer 3. In the state, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 of the first organic emission layer 61 are the first to third sub pixels 21, 22 , After sequentially depositing over 23), a shield layer SL and a PR layer are sequentially coated on the top surface of the first sub hole transport layer 6161, and a mask M is applied to the region of the first organic emission layer 61. ) Is placed, and an exposure process of exposing the PR layer of the remaining area to UV light is performed. Accordingly, characteristics of the PR layer may be changed so that the remaining regions other than the first organic light emitting layer 61 are etched in the developer. The region of the first organic emission layer 61 is the electron injection layer 611, the electron transport layer 612, the emission layer 613 of the first organic emission layer 61 only on the upper surface 41a of the first sub-electrode 41, And a region for forming the first sub hole transport layer 6161, which may be smaller than the width of the first sub electrode 41. The emission layer 613 of the first organic emission layer 61 may emit red (R) light, but is not limited thereto.

In the process of exposing the PR layer, the first sub hole transport layer 6161 disposed on the top surface of the light emitting layer 613 may block UV light so that UV light does not penetrate the light emitting layer 613. Therefore, the display device 1 according to the first embodiment of the present application can prevent damage to the light emitting layer 613 by UV light used during the exposure process.

Next, referring to FIGS. 2E and 2F, a primary removal process of removing a PR layer in a region other than the first organic light emitting layer 61 region, and a shield layer in a region other than the first organic light emitting layer 61 region (SL), an electron injection layer 611, an electron transport layer 612, a light emitting layer 613, and performs a secondary removal process to remove the first sub hole transport layer 6161. The primary removal process and the secondary removal process may be performed using at least one of an etching gas, a developer, and a stripper solution. The PR layer can be removed by corrosion by being immersed in a developer.

In the second removal process, the first organic emission layer 61 and the shield layer SL of the remaining regions including the PR layer on the first organic emission layer 61 region may be removed using an etching gas or a stripper solution. The secondary removal process can remove organic substances containing a larger amount of the shield layer SL than the primary removal process by making the exposure time to the etching gas or stripper solution longer than the primary removal process. . Through such a process, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub of the first organic light emitting layer 61 are formed only on the upper surface 41a of the first sub electrode 41. The hole transport layer 6161 remains, and in the remaining regions, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613 of the first organic emission layer 61, and the first sub hole transport layer 6161 and the shield layer ( SL) and PR layers can be removed. The remaining regions are the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole of the first organic emission layer 61 on the upper surface 41a of the first sub electrode 41 The transport layer 6161 is an area excluding the patterned portion, and may be an area including the first bank 5, the second sub-pixel 22, the second bank 9, and the third sub-pixel 23. .

In the manufacturing process of the display device 1 according to the first embodiment of the present application, after the first sub hole transport layer 6161 is disposed on the top surface of the light emitting layer 613, the above exposure process, removal process, that is, patterning process is performed. Therefore, the first sub hole transport layer 6161 can protect the light emitting layer 613 from UV light, etching gas, and stripper solution, thereby preventing damage to the light emitting layer 613 of the display device 1.

Next, referring to FIGS. 2G to 2J, a portion of the second organic emission layer 62 may be formed on the second sub-pixel 22 by repeating the above-described processes of FIGS. 2B to 2F.

More specifically, the electron injection layer 621, the electron transport layer 622, the light emitting layer 623, and the first sub of the second organic light emitting layer 62 across the first to third sub pixels 21, 22, and 23 After sequentially depositing the hole transport layer 6201 sequentially, a shield layer SL and a PR layer are sequentially coated on the top surface of the first sub hole transport layer 6201, and a mask () is formed on the second organic light emitting layer 62 region. After placing M), an exposure process in which the PR layer of the remaining area is exposed to UV light is performed. Accordingly, the properties of the PR layer except for the second organic light emitting layer 62 region may be changed so that the developer is etched. The second organic emission layer 62 region includes only the electron injection layer 621, the electron transport layer 622, and the emission layer 623 of the second organic emission layer 62 only on the upper surface 42a of the second sub-electrode 42, And a region for forming the first sub hole transport layer 6201, which may be smaller than the width of the second sub electrode 42. The emission layer 623 of the second organic emission layer 62 may emit green (G) light, but is not limited thereto.

In the process of exposing the PR layer, protecting the light emitting layer 623 by blocking the UV light by the first sub hole transport layer 6251 disposed on the top surface of the light emitting layer 623 protects the first organic light emitting layer 61 described above. The first sub hole transport layer 6161 of is the same as protecting the light emitting layer 613 from UV light. Therefore, the display device 1 according to the first embodiment of the present application can prevent damage to the light emitting layer 623 of the second organic light emitting layer 62 by UV light used during the exposure process.

In this state, the PR layer in the remaining regions except for the PR layer on the second organic light emitting layer 62 region is removed using a developer as shown in FIG. 2I, and a dry etching process or a strip process is performed as shown in FIG. 2J. The electron injection layer 621, the electron transport layer 622, the light emitting layer 623, and the first sub layer on the second organic light emitting layer 62 region, that is, on the upper surface 42a of the second sub electrode 42 A third removal process is performed to remove the rest except for the hole transport layer 6251. The electron injection layer 621 of the second organic light emitting layer 62 that was disposed on the first sub hole transport layer 6161 of the first organic light emitting layer 61 in the first sub pixel 21 by the third removal process, The electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6251 may be removed. Here, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 of the first organic emission layer 61 already formed in the first sub pixel 21 are shown in FIG. 2J. As shown in FIG. 4, the dry etching process may be entirely performed in a state where only the second sub-pixel 22 has a PR layer, and the second sub-pixel 22 in which the PR layer remains Except for the remaining portions, the electron injection layer 621, the electron transport layer 622, the light emitting layer 623 of the shield layer SL and the second organic light emitting layer 62 have the same thickness. Since it is deposited, when the dry etching process time is the same, since it is etched to the same thickness, the electron injection layer 611, electron transport layer 612, and light emitting layer 613 of the first organic emission layer 61 already formed in the first sub-pixel 21 are etched. ), and the first sub hole transport layer 6161 may remain unetched as illustrated in FIG. 2J.

Meanwhile, in the manufacturing process of the display device 1 according to the first embodiment of the present application, after the first sub hole transport layer 6201 is disposed on the top surface of the light emitting layer 623 of the second organic light emitting layer 62, the exposure as described above is performed. Since the process, the removal process, that is, the patterning process is performed, the first sub hole transport layer 6251 can protect the light emitting layer 623 from UV light, etching gas, and stripper solution, so that the light emitting layer 623 of the display device 1 Damage can be prevented.

Next, referring to FIGS. 2K to 2N, a portion of the third organic emission layer 63 may be formed in the third sub-pixel 23 by repeating the above-described FIGS. 2B to 2F.

More specifically, the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub of the third organic light emitting layer 63 over the first to third sub pixels 21, 22 and 23 After sequentially depositing the hole transport layer 6321 sequentially, a shield layer SL and a PR layer are sequentially coated on the top surface of the first sub hole transport layer 6321, and a mask (3) is formed on the third organic emission layer 63 region. After placing M), an exposure process in which the PR layer of the remaining area is exposed to UV light is performed. Accordingly, in the PR layer, characteristics other than the third organic light emitting layer 63 region may be changed so as to be etched in the developer. The third organic light emitting layer 63 region includes an electron injection layer 631, an electron transport layer 632, and a light emitting layer 633 of the third organic light emitting layer 63 only on the upper surface 43a of the third sub-electrode 43, And a region for forming the first sub hole transport layer 6301, which may be smaller than the width of the third sub electrode 43. The emission layer 633 of the third organic emission layer 63 may emit blue (B) light, but is not limited thereto.

In the process of exposing the PR layer, protecting the light emitting layer 633 by blocking UV light by the first sub hole transport layer 6301 disposed on the top surface of the light emitting layer 633 protects the first and second organic light emitting layers described above. The first sub hole transport layers 6161 and 6241 of 61 and 62 are the same as protecting the light emitting layers 613 and 623 from UV light. Therefore, the display device 1 according to the first embodiment of the present application can prevent damage to the light emitting layer 633 of the third organic light emitting layer 63 by UV light used during the exposure process.

In this state, the PR layer in the remaining regions except for the PR layer on the third organic light emitting layer 63 region is removed using a developer as shown in FIG. 2M, and a dry etching process or a strip process is performed as shown in FIG. 2N. The electron injection layer 631, the electron transport layer 632, and the light emitting layer of the third organic light emitting layer 63 stacked on the third organic light emitting layer 63 region, that is, on the upper surface 43a of the third sub-electrode 43 (633), and performs a fourth removal process to remove the rest except for the first sub hole transport layer (6341). The electron injection layer 631 of the third organic light emitting layer 63 that was disposed on the first sub hole transport layer 6161 of the first organic light emitting layer 61 in the first sub pixel 21 by the fourth removal process, The electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 6321 may be removed. Similarly, the electron injection layer 631 of the third organic light emitting layer 63 that was disposed on the first sub hole transport layer 6221 of the second organic light emitting layer 62 in the second sub pixel 22 by the fourth removal process ), the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 6321 may also be removed at the same time.

The manufacturing process of the display device 1 according to the first embodiment of the present application is the exposure process as described above after the first sub hole transport layer 6321 is disposed on the upper surface of the emission layer 633 of the third organic emission layer 63. Since the removal process, i.e., the patterning process, is performed, the first sub hole transport layer 6321 can protect the light emitting layer 633 from UV light, etching gas, and stripper solution, thereby damaging the light emitting layer 633 of the display device 1 Can be prevented.

As a result, the display device 1 according to the first embodiment of the present application includes a first sub hole transport layer on each of the light emitting layers 613, 623, and 633 of the first to third organic emission layers 61, 62, and 63. By disposing (6141, 6241, 6341) respectively, the light emitting layers 613, 623, and 633 can be protected from UV light, etching gas, and stripper solution used in the patterning process of each organic light emitting layer (61, 62, 63). It is possible to prevent deterioration of device characteristics of the light emitting layers 613, 623, and 634.

Next, referring to FIGS. 2O and 2P, the electron injection layer 611 and the electron transport layer 612 of the first organic emission layer 61 patterned for each of the first to third sub-pixels 21, 22, and 23, respectively, The light emitting layer 613, the first sub hole transport layer 6161, the electron injection layer 621 of the second organic light emitting layer 62, the electron transport layer 622, the light emitting layer 623, the first sub hole transport layer 6251, and The second sub hole transport layer of the first organic light emitting layer 61 so as to cover the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 631 of the third organic light emitting layer 63 By partially depositing the (6142), the second hole transport layer 615, the hole injection layer 616, the second electrode 7, and the encapsulation layer 8 sequentially, the manufacturing process may be partially completed.

Here, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 include a first sub pixel 21, a second sub pixel 22, And a second sub hole transport layer, a second hole transport layer, and a hole injection layer of the second organic light emitting layer 62 because it is a common layer deposited over the third sub pixel 23, and the third organic light emitting layer ( 63) may be a second sub hole transport layer, a second hole transport layer, and a hole injection layer.

Accordingly, the second sub hole transport layer 6142 deposited over the first to third sub pixels 21, 22, and 23 are the top, side, and emission layers of each of the first sub hole transport layers 6161, 6241, and 6341. The side surfaces of 613, 623, and 633, the side surfaces of electron transport layers 612, 622, and 632, and the side surfaces of electron injection layers 611, 621, and 631 may be covered.

In the display device 1 according to the first embodiment of the present application, the second sub hole transport layer 6162, the second hole transport layer 615, and the hole injection layer 616 of the organic light emitting layer 6 are first to third. Since the sub-pixels 21, 22, and 23 are disposed as a common layer covering all of the sub-pixels, the number of manufacturing processes can be reduced compared to the case of forming the second sub-hole transport layer, the second hole transport layer, and the hole injection layer for each sub-pixel It can have an effect of reducing the tact time of the display device.

On the other hand, as shown in Figure 2p, the electron injection layer 611 of the first organic light emitting layer 61, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 is a second organic light emitting layer The electron injection layer 621 of 62, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6201 may be disposed to be spaced apart from each other. Accordingly, even if an electric field is formed between the first sub-electrode 41 and the second electrode 7, no leakage current is generated toward the second sub-pixel 22, so that the second sub-pixel 22 does not emit light. Can. Likewise, even if an electric field is formed between the second sub-electrode 42 and the second electrode 7, no leakage current is generated toward the first sub-pixel 21, so that the first sub-pixel 21 may not emit light. have.

In addition, the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, and the first sub hole transport layer 631 of the third organic light emitting layer 63 are the electron injection layer of the second organic light emitting layer 62 621, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6251 may be disposed to be spaced apart from each other. Accordingly, even when an electric field is formed between the third sub-electrode 43 and the second electrode 7, no leakage current is generated toward the second sub-pixel 22, so that the second sub-pixel 22 does not emit light. Can.

As a result, the display device 1 according to the first embodiment of the present application includes the electron injection layers 611, 621, and 631 of the first to third organic light emitting layers 61, 62, and 63, and the electron transport layer 612, 622, 632), the light emitting layers 613, 623, and 633, and the first sub hole transport layers 6161, 6241, and 6341 are provided to be spaced apart from each other, so that color mixing between adjacent sub pixels emitting different colors of light occurs. Can be prevented.

FIG. 3 is a schematic structural diagram of part A of FIG. 1, FIG. 4 is a graph showing the ratio of oxygen included in the first sub hole transport layer and the second sub hole transport layer of FIG. 3, and FIG. 5 is a part B of FIG. 3 6 is a graph showing a voltage change according to driving of the organic light emitting layer of the display device according to the first embodiment of the present application.

3 to 6, in the display device 1 according to the first exemplary embodiment of the present application, each of the first sub hole transport layers 6161, 6241, and 6341 respectively displays an upper surface of each of the light emitting layers 613, 623, and 633. Since a patterning process including an exposure and etching process is performed in a covered state, the energy level of the first sub hole transport layer 6161, 6241, 6341 and the second sub hole transport layer 6142 disposed in a common layer, that is, energy Level differences may occur.

3 is an electron injection layer 611, an electron transport layer 612, a light emitting layer 613, and a first sub of the first organic light emitting layer 61 that is disposed on the first sub pixel 21 and emits red (R) light. The first hole transport layer 614 including the hole transport layer 6161 and the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616, and their respective energy levels schematically It is shown. 3, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, the first sub hole transport layer 6161, and the second sub hole transport layer constituting the first organic emission layer 61 Each of the (6142), the second hole transport layer 615, and the hole injection layer 616 has a different energy level.

More specifically, the LUMO energy level of the electron transport layer 612 may be greater than the LUMO energy level of the electron injection layer 611, and the HOMO energy level of the electron transport layer 612 may be greater than the HOMO energy level of the electron injection layer 611. It can be big. The LUMO energy level of the light emitting layer 613 may be smaller than the LUMO energy level of the electron transport layer 612, and the HOMO energy level of the light emitting layer 613 may be greater than the HOMO energy level of the electron transport layer 612. The LUMO energy level of the first sub hole transport layer 6161 may be greater than the LUMO energy level of the emission layer 613, and the HOMO energy level of the first sub hole transport layer 6161 may be greater than the HOMO energy level of the emission layer 613. have. The LUMO energy level of the second sub hole transport layer 6142 may be greater than the LUMO energy level of the first sub hole transport layer 6161, and the HOMO energy level of the second sub hole transport layer 6142 may be the first sub hole transport layer 6161 ) May be greater than the HOMO energy level. The LUMO energy level of the second hole transport layer 615 may be smaller than the LUMO energy level of the second sub hole transport layer 6142, and the HOMO energy level of the second hole transport layer 615 may be less than that of the second sub hole transport layer 6142. It may be greater than the HOMO energy level. The LUMO energy level of the hole injection layer 616 may be smaller than the LUMO energy level of the second hole transport layer 615, and the HOMO energy level of the hole injection layer 616 may be less than the HOMO energy level of the second hole transport layer 615. It can be small.

Here, the electron injection layer 611, the electron transport layer 612, and the light emitting layer 613, which are electron transfer parts, may have a difference in LUMO energy level at the boundary of each layer, which may affect the driving voltage, and the hole moving part The phosphorus injection layer 616, the second hole transport layer 615, the second sub hole transport layer 6142, the first sub hole transport layer 6161, and the light emitting layer 613 have HOMO energy levels at the boundary of each layer. The difference in can affect the driving voltage. Therefore, if the difference in the LUMO energy level of each layer in the electron transfer portion is large, the driving voltage may be large because electrons cannot move smoothly toward the light emitting layer 613, and the difference in the LUMO energy level of each layer in the electron transfer portion is small. If it is, the electrons can move smoothly toward the light emitting layer 613, so the driving voltage can be reduced. Likewise, if the difference in HOMO energy level of each layer in the hole moving portion is large, the driving voltage may be increased because holes cannot smoothly move toward the light emitting layer 613, and the difference in HOMO energy level of each layer in the hole moving portion is small. If it is, the hole can smoothly move toward the light emitting layer 613, so the driving voltage can be reduced.

Since the display device 1 according to the first embodiment of the present application is disposed up to the first sub hole transport layer 6161 on the top surface of the light emitting layer 613, a patterning process such as an exposure process or a dry etching process is performed, so that the first sub The hole transport layer 6161 prevents deterioration of the light emitting layer 613 by blocking UV light, thereby preventing damage to the light emitting layer 613 as well as preventing damage to the light emitting layer 613 from etching gas or a stripper solution. The device 1 is provided as described in the manufacturing process described above.

Meanwhile, since the exposure process is performed on the first sub hole transport layer 6161, the first sub hole transport layer 6161 may be deteriorated. Accordingly, the LUMO energy level may increase and the HOMO energy level may decrease in the first sub-hole transport layer 6161. That is, as illustrated in FIG. 3, the first sub hole transport layer 6161 may be expanded in an upper direction and a lower direction. Accordingly, an energy level difference between the first sub hole transport layer 6161 and the layer disposed on the top surface of the first sub hole transport layer 6161 may be increased.

However, in the display device 1 according to the first embodiment of the present application, by disposing the second sub hole transport layer 6142 made of the same material on the upper surface of the first sub hole transport layer 6161 in which the patterning process is performed, The energy gap between the first sub hole transport layer 6161 and the second sub hole transport layer 6142 can be reduced compared to a case in which a layer made of a different material is disposed on the top surface of the first sub hole transport layer 6161.

More specifically, the difference between the LUMO energy level of the first sub hole transport layer 6161 and the LUMO energy level of the second sub hole transport layer 6142 may be 0.2 eV or more and 0.5 eV or less. The difference between the HOMO energy level of the first sub hole transport layer 6161 and the HOMO energy level of the second sub hole transport layer 6142 may be 0.2 eV or more and 0.5 eV or less.

In addition, the display device 1 according to the first embodiment of the present application is disposed on the upper surface of the first sub hole transport layer 6161 by the second sub hole transport layer 6142 provided with the same material, thereby the patterning process. The lost first sub-hole transport layer 6161 may be compensated to prevent the luminous efficiency of the first organic emission layer 61 from being lowered.

Referring to FIG. 3 again, the second hole transport layer 615 disposed to cover the second sub hole transport layer 6142 may be formed of a different material from the second sub hole transport layer 6142. The second hole transport layer 615 may be a material required to exhibit device characteristics, and may be a material capable of injecting holes into the second sub hole transport layer 6142 well.

More specifically, as shown in FIG. 3, the second hole transport layer 615 is disposed between the hole injection layer 616 and the second sub hole transport layer 6142 to be disposed on the upper surface of the second sub hole transport layer 6142. do. Here, the HOMO energy level of the second hole transport layer 615 is approximately 0.11 eV different from the LUMO energy level of the hole injection layer 616, and the HOMO energy level and the hole injection layer 616 of the second sub hole transport layer 6162 It can be seen that the LUMO energy level of) is about 0.35 eV difference. That is, when the second hole transport layer 615 is made of the same material as the second sub hole transport layer 6142, a difference in energy level of about 0.35 eV occurs between the hole injection layer 616 and the energy level difference, as described above. Is larger than the energy level difference of about 0.11 eV when the second hole transport layer 615 is made of a different material from the second sub hole transport layer 6142. If the energy level difference is large, holes cannot move smoothly from the hole injection layer to the second hole transport layer, and thus holes accumulate between the hole injection layer and the interface of the second hole transport layer, which can increase the driving voltage of the entire organic light emitting layer. . When the driving voltage of the organic light emitting layer is increased, a problem that a life of the light emitting device is shortened may occur.

As a result, the display device 1 according to the first embodiment of the present application arranges the second hole transport layer 615 in a material different from that of the second sub hole transport layer 6142, thereby energy with the hole injection layer 616 Since the difference in level can be reduced, the holes are smoothly moved from the hole injection layer 616 to the second sub hole transport layer 6162 through the second hole transport layer 615 to prevent the life of the light emitting device from being shortened. Can be.

Referring to FIG. 4, after the display device 1 according to the first embodiment of the present application is disposed up to the first sub hole transport layer 6161 on the top surface of the light emitting layer 613, a patterning process such as an exposure process, a dry etching process, etc. Since the first sub hole transport layer 6161 is exposed to air, the first sub hole transport layer 6161 may include oxygen (O ₂ ) in the air.

Therefore, the ratio of the oxygen (O ₂ ) included in the first sub hole transport layer 6161 and the second sub hole transport layer 6142 of the display device 1 according to the first embodiment of the present application is the first sub The hole transport layer and the second sub hole transport layer may be higher than in the case of continuously depositing in a vacuum state without a patterning process. For example, when the first sub hole transport layer and the second sub hole transport layer are continuously deposited in a vacuum state without a patterning process, the ratio of oxygen (O ₂ ) contained in the first sub hole transport layer and the second sub hole transport layer is 2 Although less than %, the ratio of oxygen (O ₂ ) included in the first sub hole transport layer 6161 and the second sub hole transport layer 6142 of the display device 1 according to the first embodiment of the present application is It may be 3% or more and 16% or less. Figure 4 shows this graphically.

In FIG. 4, the horizontal axis represents the thickness of the first hole transport layer, that is, the thickness of the first sub-hole transport layer and the second sub-hole transport layer, and the vertical axis represents the ratio of oxygen (O ₂ ) included in the first hole transport layer. Shows. Here, L1 is a graph showing the ratio of the oxygen (O ₂ ) of the first hole transport layer when the first sub hole transport layer and the second sub hole transport layer are continuously deposited in a vacuum state without a patterning process, and L2 is the first part of the present application. This is a graph showing the ratio of oxygen (O ₂ ) of the first hole transport layer 614 of the display device 1 according to the exemplary embodiment. As shown in FIG. 4, since the first sub-hole transport layer and the second sub-hole transport layer are continuously deposited in the vacuum state, L1 has almost no proportion of 1% of oxygen (O ₂ ) in the first hole transport layer. On the other hand, L2 has a proportion of oxygen (O ₂ ) in the first hole transport layer 614 of about 3% or more and 16% or less, which is higher than that of L1. In particular, 100 100 or more close to the upper surface of the first sub hole transport layer 6161 It shows the highest oxygen (O ₂ ) ratio below 200 MPa.

As described above, the display device 1 according to the first embodiment of the present application confirms the proportion of oxygen (O ₂ ) included in the first hole transport layer 614, thereby providing the first sub hole transport layer 6161 made of the same material. ) And the second sub hole transport layer 6142 can be seen that the patterning process was performed. The ratio of oxygen (O ₂ ) included in the first hole transport layer 614 may be confirmed through an analysis method such as EDS.

In addition, as illustrated in FIG. 4, the display device 1 according to the first embodiment of the present application is closer to the center of the first hole transport layer 614 than the interface formed by the first hole transport layer 614 and other layers. It may be provided to increase the oxygen content.

Meanwhile, referring to FIG. 3, the display device 1 according to the first embodiment of the present application includes the thickness (T1, shown in FIG. 3) of the first sub hole transport layer 6161 and the second sub hole transport layer 6142. The thickness (T2, shown in Figure 3) may be provided in the same as each other. For example, if one conventional hole transport layer is provided and its thickness is 400 Å, the display device 1 may have a thickness of 400 Å combined with the first sub hole transport layer 6161 and the second sub hole transport layer 6142. It may be provided. That is, the present display device 1 can be formed by dividing one conventional hole transport layer into two. Therefore, the thickness T1 of the first sub hole transport layer 6161 may be 200 mm 2, and the thickness T2 of the second sub hole transport layer 6142 may be 200 mm 2. However, the thickness T1 of the first sub hole transport layer 6161 is 100 Å or more, and the thickness T2 of the second sub hole transport layer 6142 is 300 Å or less. This is because the effect of protecting the light emitting layer 613 from UV light, etching gas, and stripper solution used in the patterning process is lowered when the thickness (T1) of the first sub hole transport layer 6161 is less than 100 Pa.

The display device 1 according to the first embodiment of the present application has the same thickness of 400 Å as the sum of the first sub hole transport layer and the second sub hole transport layer for each of the first to third sub pixels 21, 22, and 23. It is provided, and may be provided so that the thickness T2 of the second sub hole transport layer 6142 is changed according to the thickness T1 of the first sub hole transport layer 6161.

If the thickness of the first sub hole transport layer 6161 and the second sub hole transport layer 6142 is different for each of the sub pixels 21, 22, and 23, the interval between the first electrode 4 and the second electrode 7 is sub This is because different electric fields are formed for each sub-pixel because it is different for each pixel. When different electric fields are formed for each sub-pixel, only the luminance of a specific color increases, and thus, when viewed as a whole, luminance may become uneven.

Therefore, in the display device 1 according to the first embodiment of the present application, the thickness of the sum of the first sub hole transport layer 6161 and the second sub hole transport layer 6142 is the same for each sub pixel 21, 22, 23. By configuring, it can be provided to prevent the overall luminance from being uneven.

5 shows that the first sub hole transport layer 6161 and the second sub hole transport layer 6142 are made of the same material, thereby forming holes between the first sub hole transport layer 6161 and the second sub hole transport layer 6142. It shows that it does not accumulate and moves smoothly.

As described above, since the patterning process is performed in a state where the first sub hole transport layer 6161 is deposited on the top surface of the light emitting layer 613, the first sub hole transport layer 6161 is expanded by air exposure. The injection of holes toward the 1 sub hole transport layer 6161 may be difficult. If a layer having a different material is disposed on the top surface of the first sub hole transport layer, holes may accumulate between the first sub hole transport layer and the interface of the other material layer, which may cause a problem that the driving voltage increases in light emission.

However, in the display device 1 according to the first embodiment of the present application, the second sub hole transport layer 6142 of the same material is disposed on the top surface of the first sub hole transport layer 6161, so that the driving voltage is almost constant even after time passes. It is possible to maintain the same state as the initial driving voltage without change. Figure 6 shows this graphically.

In FIG. 6, the horizontal axis represents time, and the vertical axis represents a change in driving voltage. Here, L3 is a graph showing a change in driving voltage over time when a patterning process is performed on the light emitting layer so that the light emitting layer is exposed to air and a hole transport layer is deposited on the top surface of the light emitting layer, and L4 is according to the first embodiment of the present application The patterning process is performed in a state where the first sub hole transport layer 6161 is deposited on the top surface of the light emitting layer 613 of the display device 1, and the second sub hole of the same material is formed on the top surface of the first sub hole transport layer 6161 It is a graph showing a change in driving voltage over time when the transport layer 6142 is deposited. As shown in FIG. 6, since L3 is exposed to air and a hole transport layer of a different material from the light emitting layer is deposited, as described above, holes accumulate at the interface between the light emitting layer and the hole transport layer of a different material, and as time passes, It can be seen that the driving voltage is high. On the other hand, in L4, the second sub hole transport layer 6142 of the same material is disposed on the top surface of the first sub hole transport layer 6161 even though the first sub hole transport layer 6161 is exposed to air, so the second sub hole transport layer 6142 ), it can be seen that the movement of holes to the first sub hole transport layer 6161 is smooth, so that there is little variation in driving voltage with time.

As a result, in the display device 1 according to the first embodiment of the present application, even if the first sub hole transport layer 6161 is exposed in the air, the second sub hole transport layer 6142 of the same material may have the first sub hole transport layer 6161 ) To prevent the hole from accumulating at the interface between the first sub hole transport layer 6161 and the second sub hole transport layer 6142, thereby preventing the driving voltage from rising, thereby causing the light emitting layer 613 ) Can be provided to prevent the device life is shortened.

7 is a graph showing an improvement in the life of the organic light emitting layer of the display device according to the first embodiment of the present application.

In FIG. 7, the horizontal axis represents time, and the vertical axis represents the initial luminance in terms of 100%. Here, L5 is a graph showing the lifespan of the light emitting layer when a patterning process is performed on the top surface of the light emitting layer, and a hole transport layer is provided as one layer and deposited on the top surface of the light emitting layer, and L6 is according to the first embodiment of the present application The patterning process is performed in a state in which the first sub hole transport layer 6161 of the display device 1 covers the light emitting layer 613, and the second sub hole transport layer 6142 of the same material is used to replace the first sub hole transport layer 6142. It is a graph showing the lifetime of the light emitting layer when covered. As shown in FIG. 7, L5 has a device life of about 1 hour when the luminance is about 78%, while L6 has a device life of about 50 hours when the luminance is about 78%.

As a result, in the display device 1 according to the first embodiment of the present application, a patterning process is performed in a state where the first sub hole transport layer 6161 covers the light emitting layer 613, and the first sub hole transport layer 6161 The second sub hole transport layer 6142 of the same material is disposed to cover the first sub hole transport layer 6161, so that a patterning process is performed on the top surface of the light emitting layer and a hole transport layer of a different material is disposed on the top surface of the light emitting layer. The device life of the light emitting layer 613 can be improved.

8 is a schematic cross-sectional view of a display device according to a second exemplary embodiment of the present application.

Referring to FIG. 8, the display device 1 according to the second embodiment of the present application includes the first sub hole transport layers 6162, 6121 and 6341 of the first to third organic light emitting layers 61, 62 and 63, respectively. It is the same as the display device 1 according to FIG. 1 described above, except that the thicknesses are different. Therefore, the same reference numerals are assigned to the same components, and only different components will be described below.

In the case of the display device according to FIG. 1 described above, the thicknesses of the first sub hole transport layers 6162, 6121, and 6341 of the first to third organic light emitting layers 61, 62, and 63 are all the same.

On the other hand, in the case of the display device according to FIG. 8, the thickness of the first sub hole transport layer 6142 of the first organic emission layer 61 and the second sub hole transport layer 6221 of the second organic emission layer 62 3 Thicker than the thickness of the third sub hole transport layer 6321 of the organic emission layer 63, and the thickness of the second sub hole transport layer 6251 of the second organic emission layer 62 is the third of the third organic emission layer 63 It is provided to be thicker than the thickness of the sub hole transport layer 6321. Accordingly, the display device 1 according to the second embodiment of the present application may implement micro-cavity characteristics for each of the first to third sub-pixels 21, 22, and 23.

On the other hand, the second sub holes of the first organic light emitting layer 61 disposed as a common layer on the first sub hole transport layer (6142, 6241, 6341) of each of the first to third organic light emitting layer (61, 62, 63) The transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 include the first sub hole transport layers 6161, 6241, and 6341 of the first to third organic emission layers 61, 62, and 63, respectively. As it is provided with different thicknesses, it may be provided to have a step along the profiles of the first sub hole transport layers 6161, 6241, and 6341.

The first organic light emitting layer 61 emits red light, the second organic light emitting layer 62 emits green light, and the third organic light emitting layer 63 may be provided to emit blue light, but is necessarily limited to this. Does not work. However, the thickness of the first sub hole transport layer disposed in the organic light emitting layer that emits long wavelength light, for example, red light, is thicker than the thickness of the first sub hole transport layer disposed in the organic light emitting layer that emits short wavelength light, such as blue light. Can.

9 is a schematic cross-sectional view of a display device according to a third embodiment of the present application, and FIGS. 10A to 10J are schematic manufacturing process cross-sectional views of a display device according to a third embodiment of the present application.

9 to 10J, the display device 1 according to the third exemplary embodiment of the present application includes the electron injection layers 611, 621, and 631 of the first to third organic emission layers 61, 62, and 63, respectively. , The same as the display device 1 according to FIG. 1 described above, except that the structures of the electron transport layers 612, 622, and 632 and the first sub hole transport layers 6161, 6241, and 6341 are changed. Therefore, the same reference numerals are assigned to the same components, and only different components will be described below.

In the case of the display device according to FIG. 1 described above, the electron injection layers 611, 621, and 631 of the first to third organic emission layers 61, 62, and 63, and the electron transport layers 612, 622, and 632, respectively, serve Pixels 21, 22, and 23 are spaced apart from each other. In addition, the first sub hole transport layers 6161, 6241, and 6341 of each of the first to third organic light emitting layers 61, 62, and 63 are provided to coincide with both ends of the light emitting layers 613, 623, 633, respectively, so that the light emitting layers ( 613, 623, and 633 are disposed only on the upper surfaces of each, and do not contact the electron transport layers 612, 622, and 632 disposed on the lower surfaces of the light emitting layers 613, 623, and 633.

In contrast, in the case of the display device according to the third embodiment of FIG. 9, the electron injection layers 611, 621, 631 and the electron transport layer 612 of the first to third organic light emitting layers 61, 62, 63, respectively, 622, 632) are provided to be connected to each other. Accordingly, the display device 1 according to the third exemplary embodiment of the present application includes an electron injection layer 611, an electron transport layer 612, a second sub hole transport layer 6142, and a second hole of the first organic emission layer 61. The transport layer 615, and the hole injection layer 616, the electron injection layer 621 of the second organic light-emitting layer 62, the electron transport layer 622, the second sub hole transport layer, the second hole transport layer, and the hole injection layer, respectively And the electron injection layer 621 of the second organic light emitting layer 62, the electron transport layer 622, the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the third organic light emitting layer 63 The electron injection layer 631, the electron transport layer 632, the second sub hole transport layer, the second hole transport layer, and the hole injection layer may be provided to be connected to each other. Here, the second sub hole transport layer 6162, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 are the first to third subs as described above in the first embodiment. Since it is a common layer formed over the pixels 21, 22, and 23, it can be a second sub hole transport layer, a second hole transport layer, and a hole injection layer of the second organic light emitting layer 62, as shown in FIG. 9, A second sub hole transport layer, a second hole transport layer, and a hole injection layer of the third organic light emitting layer 63 may be used.

As a result, the display device 1 according to the third embodiment of the present application includes the electron injection layers 611, 621, and 631 and the electron transport layer 612, respectively, of the first to third organic emission layers 61, 62, and 63. Since 622 and 632 are formed to be connected to each other, the number of manufacturing processes can be reduced as compared to the case where the electron injection layer and the electron transport layer are formed for each of the sub pixels 21, 22, and 23, thereby reducing the tact time of the completed display device. Can have the effect.

Meanwhile, the display device 1 according to the third embodiment of the present application includes the electron injection layers 611, 621, and 631 of the first to third organic emission layers 61, 62, and 63, and the electron transport layers 612, 622. 632), the second sub hole transport layer (6142, 6242, 6342), the second hole transport layer, and the hole injection layer, the remaining components of the first to third organic light emitting layers (61, 62, 63) as the light emitting layer ( 613, 623, and 633 and the first sub hole transport layer 6161, 6241, and 6341 may be disposed to be spaced apart from each other. Accordingly, the display device 1 according to the third embodiment of the present application includes the light emitting layers 613, 623, and 633 of the first to third organic light emitting layers 61, 62, and 63, and the first sub hole transport layer 61 1, 6241. , 6341) may be provided to emit light of different colors for each of the first to third sub-pixels 21, 22, and 23 as the first to third sub-pixels 21, 22, and 23 are spaced apart from each other. Can.

Referring to FIG. 9 again, in the display device 1 according to the third exemplary embodiment of the present application, the first sub hole transport layer 6161 of the first organic emission layer 61 includes the emission layer 613 of the first organic emission layer 61 ) While covering the top surface and the side surface of the first organic light emitting layer 61, it may be provided to contact the top surface of the electron transport layer 612.

In the case of the display device of FIG. 1, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 are sequentially deposited and then patterned using a dry etching process. On the other hand, in the case of the display device of FIG. 9, after the electron injection layer 611, the electron transport layer 612, the shield layer SL, and the PR layer are sequentially deposited, the shield layer SL and the PR layer are removed, , After depositing the light emitting layer 613 and the first sub hole transport layer 6161 in the removed grooves, the rest of the shield layer SL and the PR layer are removed using a lift-off process, so this structural difference may occur. That is, since the display device of FIG. 1 is a display device manufactured using a dry etching process, and the display device of FIG. 9 is a display device manufactured using a lift-off process, the first sub hole transport layer 6161 is the light emitting layer 613 ), or a structural difference in which the first sub hole transport layer 6161 covers both the top surface and the side surface of the light emitting layer 613 may occur.

Hereinafter, the display device 1 according to the third embodiment of the present application shown in FIG. 9 is combined with the manufacturing process of the display device 1 according to the third embodiment of the present application shown in FIGS. 10A to 10J, The above differences will be described in detail.

First, referring to FIGS. 10A to 10B, a first electrode 4, a first bank 5, and a second bank 9 are formed on the substrate 2 and the circuit element layer 3. In, the first deposition hole (shown in FIG. 10C) after sequentially applying the electron injection layer 611, the electron transport layer 612, the shield layer SL and the PR layer of the first organic light emitting layer 61 After placing the mask M (shown in Fig. 10B) where this will be formed, the rest is exposed. Accordingly, the characteristics of the PR layer may be changed so that the remaining regions other than the region where the first deposition hole H1 is to be formed are not etched by the developer.

Since the electron injection layer 611 and the electron transport layer 612 of the first organic emission layer 61 are entirely deposited as a common layer as described above, the electron injection layer 621 and the electron transport layer of the second organic emission layer 62 (622), the electron injection layer 631 and the electron transport layer 632 of the third organic light emitting layer 63 may be. That is, the electron injection layer 611 and the electron transport layer 612 of the first organic emission layer 61 are the electron injection layer 621 and the electron transport layer 622 of the second organic emission layer 62, and the third organic The electron injection layer 631 and the electron transport layer 632 of the emission layer 63 may be connected to each other.

The first deposition hole H1 is a hole for forming the light emitting layer 613 and the first sub hole transport layer 6161 of the first organic emission layer 61, and finally will be an upper surface of the electron transport layer 612. Can. The PR layer may be a photoresist layer. The emission layer 613 may be a red emission layer that emits red (R) light when an electric field is formed.

Next, referring to FIG. 10C, a primary removal process is performed in which a PR layer located in a region where the first deposition hole H1 is to be formed is removed using a developer. The PR layer removed by the developer can be removed by corrosion by being immersed in the developer.

Next, referring to FIG. 10D, a second removal process is performed to remove the shield layer SL located in the region where the first deposition hole H1 is to be formed using a developer. At this time, in the second removal process, by increasing the time immersed in the developer compared to the first removal process, the volume of the shield layer SL removed compared to the first removal process is increased, so-called undercut, UC) region. Therefore, the width of the shield layer SL removed by the secondary removal process may be wider than the width of the PR layer removed by the first removal process.

Next, referring to FIG. 10E, an emission layer 613 of the first organic emission layer 61 is formed on the electron transport layer 612 disposed in the first deposition hole H1. For example, a light emitting layer 613 of the first organic emission layer 61 may be formed by supplying and depositing organic materials in various ways toward the upper surfaces of the electron transport layer 612 and the PR layer outside the PR layer. In this case, the light emitting layer 613 may be deposited on the upper surface of the electron transport layer 612 through the first deposition hole H1. Meanwhile, a light emitting layer 613 may be deposited on the PR layer due to this process.

Next, referring to FIG. 10F, a first sub hole transport layer 6161 is deposited to surround the emission layer 613 of the first organic emission layer 61. More specifically, the first sub hole transport layer 6161 may contact each of the top surface 6131 and the side surface 6132 of the light emitting layer 613 through the first deposition hole H1. At this time, since the first sub hole transport layer 6161 is deposited after the light emitting layer 613 is formed, the top surface of the electron transport layer 612 may be contacted while covering the light emitting layer 613. On the other hand, the first sub hole transport layer 6161 may be deposited on the light emitting layer 613 such that the thickness is 100 mm or more in a sputtering manner. Therefore, the first sub hole transport layer 6161 may protect the light emitting layer 613 so that the light emitting layer 613 of the first organic light emitting layer 61 is not damaged by an etchant used in a subsequent process.

Next, referring to FIG. 10G, except for the first sub-hole transport layer 6161 surrounding the emission layer 613 of the first organic emission layer 61 and the emission layer 613 of the first organic emission layer 61. The third removal process is performed. The third removal process is the first sub-pixel 21 except for the light emitting layer 613 and the first sub-hole transport layer 6161 of the first organic emission layer 61 formed on the upper surface of the electron transport layer 612, the first Strip process of banks including one bank 5 and the second bank 9, and a shield layer SL applied on the second sub-electrode 42 and the third sub-electrode 43 It can be achieved by lift-off through (Lift-off). Accordingly, only the light emitting layer 613 whose upper surface 6131 and the side surface 6132 are protected by the first sub hole transport layer 6161 may remain on the upper surface of the electron transport layer 612 in the first sub pixel 21. . Therefore, the first sub hole transport layer 6161 prevents the etchant used in the subsequent process from contacting the luminescent layer 613 of the first organic luminescent layer 61, thereby luminescent layer of the first organic luminescent layer 61 by the etchant ( 613) can be prevented from being damaged.

Next, referring to FIG. 10H, in the display device 1 according to the third embodiment of the present application, the processes of FIGS. 10B to 10G described above are repeatedly performed, so that the electron transport layer of the second sub-pixel 22 is A light emitting layer 623 of the second organic light emitting layer 62 having an upper surface and side surfaces protected by a first sub hole transport layer 6251 of the second organic light emitting layer 62 is formed on the upper surface, and the third sub pixel 23 is formed. A light-emitting layer 633 of the third organic light-emitting layer 63 may be formed on the top surface of the electron transport layer of the third organic light-emitting layer 63 by protecting the top and side surfaces of the first sub-hole transport layer 631.

As a result, in the display device 1 according to the third embodiment of the present application, the first sub hole transport layer 6161 of the first organic light emitting layer 61 protects the light emitting layer 613 of the first organic light emitting layer 61. Since the etching process is performed to pattern the light emitting layer 623 of the second organic light emitting layer 62 and the light emitting layer 633 of the third organic light emitting layer 63 in the state, the light emitting layer 613 of the first organic light emitting layer 61 formed first ) Can be prevented from being damaged by the etchant used in the subsequent process.

Likewise, in the display device 1 according to the third embodiment of the present application, the first sub hole transport layer 6221 of the second organic light emitting layer 62 is used for the etching process of the light emitting layer 633 of the third organic light emitting layer 63. It is possible to prevent the light emitting layer 623 of the second organic light emitting layer 62 from being damaged from the etching solution used. The first sub hole transport layer 6321 of the third organic emission layer 63 may prevent the emission layer 633 of the third organic emission layer 63 from being damaged by the etching solution of the strip process used in the third removal process. have.

On the other hand, although not shown, in the display device 1 according to the third embodiment of the present application, each of the first sub hole transport layers 6161, 6241, and 6341 protects the light emitting layers 613, 623, and 633, respectively. Since the etching process is performed, the light emitting layers 613 and 623 from the cleaning solution used in the cleaning process are additionally performed even after a cleaning process for more reliably removing residual materials of the shield layer SL after the etching process. , 633) can be prevented from being damaged. Therefore, since the display device 1 according to the third embodiment of the present application can prevent the foreign matter including the residual shield layer from remaining in the organic light emitting layer 6, the emission efficiency of the organic light emitting layer 6 is caused by the foreign matter. It can prevent falling.

Next, referring to FIGS. 10I and 10J, the display device 1 according to the third exemplary embodiment of the present application includes a first sub hole transport layer 6161 surrounding the light emitting layer 613 of the first organic emission layer 61. 2 After the first sub hole transport layer 6161 surrounding the light emitting layer 623 of the organic light emitting layer 62 and the first sub hole transport layer 631 surrounding the light emitting layer 633 of the third organic light emitting layer 63 are formed, the first The second sub hole transport layer 6142, the second hole transport layer 615, the hole injection layer 616, the second electrode 7, and the encapsulation layer 8 of the organic light emitting layer 61 are sequentially deposited on the entire surface, The manufacturing process may be partially completed.

Here, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 include a first sub pixel 21, a second sub pixel 22, And a second sub hole transport layer, a second hole transport layer, and a hole injection layer of the second organic light emitting layer 62 because it is a common layer deposited over the third sub pixel 23, and the third organic light emitting layer ( 63) may be a second sub hole transport layer, a second hole transport layer, and a hole injection layer.

As a result, the first sub hole transport layer 6161 of the first organic emission layer 61, the first sub hole transport layer 6221 of the second organic emission layer 62, and the first sub hole of the third organic emission layer 63 Each of the transport layer 6321 is inside the first organic emission layer 61, the second organic emission layer 62, and the third organic emission layer 63. More specifically, between the electron transport layer 612 and the second sub hole transport layer 6142, the organic light emitting layers 61, 62, 63 of the light emitting layers 613, 623, 633 of the top and side of the contact, and the electron The light emitting layers 613, 623, and 633 may be sealed to protect the upper surface of the transport layer 612.

Although not shown, the display device 1 according to the third embodiment of the present application includes the first sub hole transport layer 6161 of the first to third organic light emitting layers 61, 62, and 63 as in the display device of FIG. 8 described above. , 6241, 6341) by providing different thicknesses, micro-cavity characteristics may be implemented for each of the first to third sub-pixels 21, 22, and 23.

On the other hand, the display device 1 according to the first to third embodiments of the present application described above is an electron injection layer (611, 621, 631) between the first electrode 4 and the electron transport layer (612, 622, 632) Although it is described as being arranged, it is not limited thereto, and an N-doped electron transport layer may be provided instead of the electron injection layers 611, 621, and 631.

11 is a schematic cross-sectional view of a display device according to a fourth embodiment of the present application, and FIGS. 12A to 12P are schematic manufacturing process cross-sectional views of a display device according to a fourth embodiment of the present application.

11 to 12p, the display device 1 according to the fourth exemplary embodiment of the present application is between the first sub hole transport layer 6161 and the second sub hole transport layer 6142 of the first organic emission layer 61. A first life improvement layer (LIL1) disposed on the second life improvement layer (LIL2) disposed between the first sub hole transport layer (6241) and the second sub hole transport layer of the second organic light emitting layer (62), and the third The display device 1 according to FIG. 1 described above, except that the organic light emitting layer 63 further includes a third life improvement layer LIL3 disposed between the first sub hole transport layer 6321 and the second sub hole transport layer. Is the same as Therefore, the same reference numerals are assigned to the same components, and only different components will be described below. In addition, in the display device 1 according to the fourth embodiment of the present application, the first life improvement layer LIL1, the second life improvement layer LIL2, and the third life improvement layer LIL3 are It may be a shield layer (SL) used in the manufacturing process of the display device according to the first embodiment, such that the shield layer (SL) is not entirely removed from the manufacturing process of the display device according to the first embodiment, it remains, It may be disposed on the light emitting layer. In addition, in the display device 1 according to the fourth embodiment, the shield layer SL used in the manufacturing process of the display device according to the first embodiment includes materials such as F, O, and N, which will be described later, and thus is electronically friendly. High degree of hole injection can be provided.

In the case of the display device according to FIG. 1 described above, the second sub hole transport layer and the second hole provided with a different material from each of the second sub hole transport layers of the first to third organic emission layers 61, 62, and 63 By arranging the transport layer 615, holes are well injected into the second sub-hole transport layer, so that the shortening of the life of the light emitting device can be prevented.

In contrast, in the case of the display device according to the fourth embodiment of FIG. 11, the first sub hole transport layers 6161, 6241, and 6341 of the first to third organic emission layers 61, 62, 63, respectively, A hole is transported from the second sub hole transport layer to the first sub hole transport layer by disposing the first life improvement layer (LIL1), the second life improvement layer (LIL2), and the third life improvement layer (LIL3) between the hole transport layers, respectively. In addition to enhancing the graininess, the first electrode 4, the electron injection layers 611, 621, and 631, which are cathode electrodes disposed under the light emitting layers 613, 623, and 633, and the electron transport layers 612, 622, By pulling electrons from at least one of 632), it is possible to increase the lifetime of the organic light emitting layer 6 by increasing the exciton generation efficiency in the light emitting layers 613, 623, and 633.

More specifically, each of the first to third life improvement layers LIL1, LIL2, and LIL3 may be formed of a polymer including fluorine (F), oxygen (O), and nitrogen (N). When the first to third life improvement layers LIL1, LIL2, and LIL3 include atoms as described above, electron affinity may be increased by having an EWG (Electron Withdrawing Group). The EWG is a functional group having a large electronegativity, and mainly has an electron pulling property through a pi bond. For example, the EWG may be Halides (-F, -CL), Cyano Groups (-CN), Nitro Group (-NO ₂ ), or the like.

In addition, each of the first to third life improvement layers (LIL1, LIL2, LIL3) is provided with a polymer containing fluorine (F), oxygen (O), and nitrogen (N), so that hole injection is performed. Can strengthen. Accordingly, the first to third life improvement layers LIL1, LIL2, and LIL3 are second electrodes 7 that are anode electrodes disposed above each of the first to third life improvement layers LIL1, LIL2, and LIL3. , Holes that move from the hole injection layer 616, the second hole transport layer 615, and the second sub hole transport layer 6142 toward the light emitting layers 613, 623, and 633 to the light emitting layers 613, 623, and 633 By injecting well into the light emitting layer (613, 623, 633) by increasing the exciton (Exciton) generation efficiency can increase the life of the organic light emitting layer (6).

Meanwhile, each of the first to third life improvement layers LIL1, LIL2, and LIL3 may have a thickness of 1 nm or more and 10 nm or less. If the thickness of each of the first to third life improvement layers LIL1, LIL2, and LIL3 is less than 1 nm, the electron pulling property and hole injection property may be too low, and thus the life improvement effect of the organic light emitting layer 6 may not be exhibited. . On the other hand, when the thickness of each of the first to third life improvement layers LIL1, LIL2, and LIL3 exceeds 10 nm, the first to third life improvement layers LIL1, LIL2, and LIL3 are first sub hole transport layers 6141 , 6241, 6341) by acting as a barrier between the second sub-hole transport layer, rather, a problem may occur that degrades the hole injection property to the light-emitting layers 613, 623, and 633. Therefore, in the display device 1 according to the fourth embodiment of the present application, the first to third life improvement layers LIL1, LIL2, and LIL3 each have a thickness of 1 nm or more and 10 nm or less, thereby providing a first sub hole. Light emitting layers 613, 623, and 633 by increasing electron pulling and hole injection into the light emitting layers 613, 623, and 633 while minimizing the barrier function between the transport layers 6161, 6241, and 6341 and the second sub hole transport layer By increasing the exciton (Exciton) generation efficiency of can increase the life of the organic light emitting layer (6).

Referring back to FIG. 11, in the display device 1 according to the fourth embodiment of the present application, the first life improvement layer LIL1 is the first sub hole transport layer 6161 of the first organic emission layer 61. ), the second life improvement layer LIL2 is disposed only on the top surface of the first sub hole transport layer 6201 of the second organic light emitting layer 62, and the third life improvement layer LIL3 is The third organic light emitting layer 63 may be disposed only on the top surface of the first sub hole transport layer 6321. This is because the first to third organic light emitting layers 61, 62 and 63 of the display device 1 according to the fourth embodiment of the present application are formed by a dry etching process. A detailed description of this will be given in the manufacturing process of FIGS. 12A to 12P.

Since the first life improvement layer LIL1 is disposed only on the top surface of the first sub hole transport layer 6161 of the first organic light emitting layer 61, both ends of the first life improvement layer LIL1 are the first organic light emitting layer The electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole transport layer 6161 may be provided to coincide with both ends.

Similarly, the second life improvement layer (LIL2) is disposed only on the top surface of the first sub hole transport layer (6241) of the second organic light emitting layer 62, so that both ends of the second life improvement layer (LIL2) are the second The electron injection layer 621 of the organic light emitting layer 62, the electron transport layer 622, the light emitting layer 623, and the first sub hole transport layer 6251 may be provided to coincide with both ends, and a third life improvement layer (LIL3) is disposed only on the upper surface of the first sub hole transport layer 6321 of the third organic light emitting layer 63, so that both ends of the third life improving layer LIL3 are electrons of the third organic light emitting layer 63 The injection layer 631, the electron transport layer 632, the emission layer 633, and the first sub hole transport layer 6321 may be provided to coincide with both ends.

12A to 12P are schematic manufacturing process cross-sectional views of a display device according to a fourth embodiment of the present application.

The display device 1 according to the fourth embodiment of the present application is provided with the first sub hole transport layer (6141, 6241, 6341) of each of the first to third organic light emitting layers (61, 62, 63) through the following manufacturing process. Electrons to the light emitting layers 613, 623, and 633 by disposing the first life improvement layer LIL1, the second life improvement layer LIL2, and the third life improvement layer LIL3 between the second sub hole transport layers, respectively. Since the pulling and hole injection properties can be increased, the efficiency of generating excitons of the light emitting layers 613, 623, and 633 can be increased to increase the life of the organic light emitting layer 6.

In the above-described manufacturing process of FIGS. 2A to 2P, the shield layer SL was used in the patterning process for forming the first to third organic light emitting layers 61, 62, and 63, but in the manufacturing process of FIGS. 12A to 12P By using a life improvement layer instead of the shield layer SL, the life improvement layer can be disposed between the first sub hole transport layer and the second sub hole transport layer. Here, the life improvement layer may mean first to third life improvement layers LIL1, LIL2, and LIL3. Therefore, except for the above differences, FIGS. 12A to 12P are mostly the same as the manufacturing processes of FIGS. 2A to 2P described above. Therefore, hereinafter, only different manufacturing processes will be described.

12A to 12E are identical except that the first life improvement layer LIL1 is used instead of the shield layer SL of FIGS. 2A to 2E described above, a detailed description thereof will be omitted.

Next, referring to FIG. 12F, a first removal process of removing a PR layer in a region other than the first organic emission layer 61 region, and a first life improvement layer in a region other than the first organic emission layer 61 region (LIL1), an electron injection layer 611, an electron transport layer 612, a light emitting layer 613, and performs a secondary removal process to remove the first sub hole transport layer 6161. The primary removal process and the secondary removal process may be performed using at least one of an etching gas, a developer, and a stripper solution. The PR layer can be removed by corrosion by being immersed in a developer.

In the second removal process, the first organic emission layer 61 and the first life improvement layer LIL1 in the remaining regions including the PR layer on the first organic emission layer 61 region may be removed using an etching gas or a stripper solution. Can. The secondary removal process removes the organic material containing a greater amount of the first life improvement layer (LIL1) than the primary removal process by making the exposure time to the etching gas or stripper solution longer than the primary removal process. can do. At this time, the secondary removal process may be performed only until a portion of the first life improvement layer LIL1 remains at a thickness of 1 nm or more and 10 nm or less on the upper surface of the first sub hole transport layer 6161.

Through such a process, the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, and the first sub hole of the first organic emission layer 61 are formed only on the upper surface 41a of the first sub electrode 41. The transport layer 6161 and the first life improvement layer LIL1 remain, and the electron injection layer 611, the electron transport layer 612, the light emitting layer 613 of the first organic light emitting layer 61, and the first sub The hole transport layer 6161, the first life improvement layer LIL1, and the PR layer may be removed. The remaining regions are the electron injection layer 611, the electron transport layer 612, the light emitting layer 613, the first sub hole transport layer of the first organic light emitting layer 61 on the upper surface 41a of the first sub electrode 41 (6141), and the first life improvement layer (LIL1) is a region excluding the patterned portion, the first bank 5, the second sub-pixel 22, the second bank 9, and the third sub-pixel ( 23) may be included.

Meanwhile, the first life improvement layer LIL1 is disposed on the first sub hole transport layer 6161, and the electron injection layer 611, the electron transport layer 612, and the light emitting layer (1) of the first organic emission layer 61 are 613), and the first sub hole transport layer 6161 together with dry etching. Therefore, as illustrated in FIG. 12F, both ends of the first life improvement layer LIL1 are provided with an electron injection layer 611, an electron transport layer 612, and a light emitting layer 613 of the first organic emission layer 61. And it may be provided to coincide with both ends of each of the first sub-hole transport layer (6141).

The manufacturing process of the display device 1 according to the fourth embodiment of the present application is the exposure process as described above after the first sub hole transport layer 6161 and the first life improvement layer LIL1 are disposed on the top surface of the light emitting layer 613. , Since the removal process, that is, the patterning process is performed, the first sub hole transport layer 6161 and the first life improvement layer LIL1 may prevent the light emitting layer 613 from being damaged from UV light, etching gas, and stripper solution. .

Next, referring to FIGS. 12G to 12J, a part of the second organic light emitting layer 62 and a second life improvement layer LIL2 are formed in the second sub-pixel 22 by repeating the aforementioned processes of FIGS. 12B to 12F. can do. The manufacturing process of FIGS. 12G to 12J is the same except that the second life improving layer LIL2 is used instead of the shield layer SL in the manufacturing process of FIGS. 2G to 2J, and detailed description thereof will be omitted. However, it is noted in FIG. 12E that the removal process is performed only until a portion of the second life improvement layer LIL2 remains at a thickness of 1 nm or more and 10 nm or less on the upper surface of the first sub hole transport layer 6251 in FIG. 12J. It is like one.

Therefore, as shown in FIG. 12J, the electron injection layer 621, the electron transport layer 622, the light emitting layer 623 of the second organic light emitting layer 62 only on the upper surface 42a of the second sub-electrode 42, The first sub hole transport layer 6251 and the second life improvement layer LIL2 may remain. In addition, both ends of the second life improvement layer LIL2 have an electron injection layer 621, an electron transport layer 622, a light emitting layer 623, and a first sub hole transport layer 6241 of the second organic light emitting layer 62. ) It may be provided to coincide with both ends of each.

In the manufacturing process of the display device 1 according to the fourth embodiment of the present application, after the first sub hole transport layer 6221 and the second life improvement layer LIL2 are disposed on the top surface of the light emitting layer 623, the exposure process and removal are performed. Since the process is performed, the first sub hole transport layer 6251 and the second life improvement layer LIL2 may prevent the light emitting layer 623 from being damaged from UV light, etching gas, and stripper solution.

Next, referring to FIGS. 12K to 12N, a portion of the third organic light emitting layer 63 and a third life improvement layer LIL3 are formed in the third sub-pixel 23 by repeating the aforementioned FIGS. 12B to 12F. can do. The manufacturing process of FIGS. 12K to 12N is the same except that the third life improving layer LIL3 is used instead of the shield layer SL in the manufacturing process of FIGS. 2K to 2N, and a detailed description thereof will be omitted. However, it is noted in FIG. 12E that the removal process is performed only until a portion of the third life improvement layer LIL3 remains at a thickness of 1 nm or more and 10 nm or less on the upper surface of the first sub hole transport layer 631 in FIG. 12K. It is like one.

Therefore, as illustrated in FIG. 12N, the electron injection layer 631, the electron transport layer 632, and the light emitting layer 633 of the third organic light emitting layer 63 only on the upper surface 43a of the third sub electrode 43, The first sub hole transport layer 6301 and the third life improvement layer LIL3 may remain. In addition, both ends of the third life improvement layer LIL3 have an electron injection layer 631, an electron transport layer 632, a light emitting layer 633, and a first sub hole transport layer 631 of the third organic emission layer 63. ) It may be provided to coincide with both ends of each.

In the manufacturing process of the display device 1 according to the fourth embodiment of the present application, after the first sub hole transport layer 6321 and the third life improvement layer LIL3 are disposed on the top surface of the light emitting layer 633, the exposure process and the removal process are removed. Since the process is performed, the first sub hole transport layer 6321 and the third life improvement layer LIL3 may prevent the light emitting layer 633 from being damaged from UV light, etching gas, and stripper solution.

Next, referring to FIGS. 12O and 12P, the electron injection layer 611 and the electron transport layer 612 of the first organic emission layer 61 patterned for each of the first to third sub pixels 21, 22 and 23, The light emitting layer 613, the first sub hole transport layer 6161, and the first life improvement layer LIL1, and the electron injection layer 621, the electron transport layer 622, and the light emitting layer 623 of the second organic light emitting layer 62 , The first sub hole transport layer 6221, and the second life improvement layer LIL2, and the electron injection layer 631, electron transport layer 632, light emitting layer 633, and the first sub of the third organic light emitting layer 63 The second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 to cover the hole transport layer 6321 and the third life improvement layer LIL3, By sequentially depositing the second electrode 7 and the encapsulation layer 8 sequentially, a part of the manufacturing process can be completed.

Here, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 include a first sub pixel 21, a second sub pixel 22, And a second sub hole transport layer, a second hole transport layer, and a hole injection layer of the second organic light emitting layer 62 because it is a common layer deposited over the third sub pixel 23, and the third organic light emitting layer ( 63) may be a second sub hole transport layer, a second hole transport layer, and a hole injection layer.

Accordingly, the second sub hole transport layer 6142 deposited over the first to third sub pixels 21, 22, and 23 is formed with the upper surfaces of the first to third life improvement layers LIL1, LIL2, and LIL3, respectively. Side surfaces, side surfaces of the first sub hole transport layers 6161, 6241, 6341, side surfaces of the light emitting layers 613, 623, 633, side surfaces of the electron transport layers 612, 622, 632, and electron injection layers 611, 621, 631).

In the display device 1 according to the fourth embodiment of the present application, the second sub hole transport layer 6162, the second hole transport layer 615, and the hole injection layer 616 of the organic light emitting layer 6 are first to third. Since the sub-pixels 21, 22, and 23 are disposed as a common layer covering all of the sub-pixels, the number of manufacturing processes can be reduced compared to the case where the second sub-hole transport layer, the second hole transport layer, and the hole injection layer are formed for each sub-pixel. It can have an effect of reducing the tact time of the display device.

On the other hand, as shown in Figure 12p, the electron injection layer 611 of the first organic light emitting layer 61, the electron transport layer 612, the light emitting layer 613, the first sub hole transport layer (6141), and the first life improvement The layer LIL1 is an electron injection layer 621 of the second organic light emitting layer 62, an electron transport layer 622, a light emitting layer 623, a first sub hole transport layer 6251, and a second life improvement layer LIL2, respectively. And may be spaced apart from each other. Accordingly, even if an electric field is formed between the first sub-electrode 41 and the second electrode 7, no leakage current is generated toward the second sub-pixel 22, so that the second sub-pixel 22 does not emit light. Can. Likewise, even if an electric field is formed between the second sub-electrode 42 and the second electrode 7, no leakage current is generated toward the first sub-pixel 21, so that the first sub-pixel 21 may not emit light. have.

In addition, the electron injection layer 631, the electron transport layer 632, the light emitting layer 633, the first sub hole transport layer 631, and the third life improvement layer LIL3 of the third organic light emitting layer 63 are the second The electron injection layer 621 of the organic light emitting layer 62, the electron transport layer 622, the light emitting layer 623, the first sub hole transport layer 6251, and the second life improvement layer (LIL2) may be disposed to be spaced apart from each other. have. Accordingly, even when an electric field is formed between the third sub-electrode 43 and the second electrode 7, no leakage current is generated toward the second sub-pixel 22, so that the second sub-pixel 22 does not emit light. Can.

As a result, the display device 1 according to the fourth embodiment of the present application includes the electron injection layers 611, 621, and 631 of the first to third organic light emitting layers 61, 62, and 63, and the electron transport layer 612, 622, 632), the light emitting layers 613, 623, 633, the first sub hole transport layer 6161, 6241, 6341 and the first to third life improvement layers LIL1, LIL2, LIL3 are provided to be spaced apart from each other, Mixing between adjacent sub-pixels emitting light of different colors may be prevented.

13 is a graph showing an improvement in the life of the organic light emitting layer of the display device according to the fourth embodiment of the present application.

In FIG. 13, the horizontal axis represents time, and the vertical axis represents the initial luminance in terms of 100%. Here, L7 is a graph showing the life of the light emitting layer when the patterning process is performed in a state in which the electron injection layer, the electron transport layer, the light emitting layer, and the hole transport layer are sequentially deposited in a vacuum without a life improvement layer, and L8 is the fourth of the present application. A patterning process is performed in a state in which the first sub hole transport layer 6161 and the first life improvement layer LIL1 of the display device 1 cover the light emitting layer 613, and the second sub hole transport layer of the same material It is a graph showing the lifetime of the light emitting layer when (6142) covers the first sub hole transport layer (6141). 13, it can be estimated that L7 has a device life of about 380 hours, whereas L8 has a device life of about 440 hours.

As a result, in the display device 1 according to the fourth embodiment of the present application, a patterning process is performed in a state in which the first sub hole transport layer 6161 and the first life improvement layer LIL1 cover the light emitting layer 613, Since the second sub hole transport layer 6142 having the same material as the first sub hole transport layer 6161 is disposed to cover the first sub hole transport layer 6161, an electron injection layer, an electron transport layer, and a light emitting layer in a vacuum state without a life improvement layer , Compared to the case where the patterning process is performed in a state in which the hole transport layer is sequentially deposited, the device life of the light emitting layer 613 may be improved.

14 is a schematic cross-sectional view of a display device according to a fifth embodiment of the present application, and FIGS. 15A to 15P are schematic manufacturing process cross-sectional views of a display device according to a fifth embodiment of the present application.

14 to 15P, the display device 1 according to the fifth exemplary embodiment of the present application is between the first sub hole transport layer 6161 and the second sub hole transport layer 6142 of the first organic emission layer 61. Further comprising a first life improvement layer (LIL1) disposed in, and a second life improvement layer (LIL2) disposed between the first sub hole transport layer 6251 and the second sub hole transport layer of the second organic light emitting layer 62 It is the same as the display device 1 according to FIG. 3 described above, except that. Therefore, the same reference numerals are assigned to the same components, and only different components will be described below. In addition, in the display device 1 according to the fifth embodiment of the present application, the first life improving layer LIL1 and the second life improving layer LIL2 are manufacturing processes of the display device according to the third embodiment It may be a shield layer (SL) used in, and such a shield layer (SL) may be disposed on the light emitting layer by remaining unremoved in the manufacturing process of the display device according to the third embodiment. In addition, in the display device 1 according to the fifth embodiment, the shield layer SL used in the manufacturing process of the display device according to the third embodiment includes materials such as F, O, N, etc., which will be described later. High degree of hole injection can be provided.

In the case of the display device according to FIG. 3, the electron injection layers 611, 621, and 631 of the first to third organic emission layers 61, 62, and 63 and the electron transport layers 612, 622, and 632 are connected to each other. By being formed, the number of manufacturing processes can be reduced compared to the case where the electron injection layer and the electron transport layer are formed for each of the sub-pixels 21, 22, and 23, so that the tact time of the completed display device can be reduced. The second sub hole transport layer 615 provided with a different material from the second sub hole transport layer is disposed on the second sub hole transport layer of each of the third organic light emitting layers 61, 62, and 63, thereby forming the second sub hole. It is possible to prevent the shortening of the lifespan of the light emitting device by allowing holes to be well injected into the transport layer.

In contrast, in the case of the display device according to the fifth embodiment of FIG. 14, between the first sub hole transport layers 6161 and 6241 of the first and second organic emission layers 61 and 62 and the second sub hole transport layer By arranging the first life improvement layer LIL1 and the second life improvement layer LIL2, respectively, not only the hole injection property from the second sub hole transport layer to the first sub hole transport layer can be enhanced, but also the light emitting layers 613 and 623 By pulling electrons from at least one of the first electrode 4, electron injection layers 611, 621, and 631, and electron transport layers 612, 622, and 632 disposed under the light emitting layers 613, 623, and 633 ) By increasing the exciton generation efficiency, it is possible to increase the life of the organic light emitting layer 6. This effect is the same as the display device according to the fourth embodiment described above.

However, unlike the display device according to the fourth embodiment, the display device 1 according to the fifth embodiment of the present application is between the first sub hole transport layer 6321 and the second sub hole transport layer of the third organic light emitting layer 63. In the third life improving layer (LIL3) is not disposed.

In addition, in the display device 1 according to the fifth embodiment of the present application, unlike the display device according to the fourth embodiment, the first life improvement layer LIL1 has the first sub hole transport layer of the first organic light emitting layer 61 ( 6141), and a second life improvement layer LIL2 is disposed on the top and side surfaces of the first sub hole transport layer 6241 of the second organic light emitting layer 62.

The reason why the display device according to the fifth embodiment is different from the display device according to the fourth embodiment is that the display device according to the fourth embodiment uses the dry-etching process to form the first to third organic materials. While forming the light emitting layers 61, 62, and 63, the display device according to the fifth embodiment forms the first to third organic light emitting layers 61, 62, and 63 using a lift-off process. Because.

Due to this difference in process, the display device 1 according to the fifth embodiment of the present application improves the third life between the first sub hole transport layer 6321 and the second sub hole transport layer of the third organic light emitting layer 63 The layer LIL3 is not disposed, and the first life improvement layer LIL1 is disposed on the top and side surfaces of the first sub hole transport layer 6161 of the first organic light emitting layer 61, and the second life improvement layer LIL2 The second organic light emitting layer 62 may be disposed on the top and side surfaces of the first sub hole transport layer 6251.

Hereinafter, the display device 1 according to the fifth embodiment of the present application shown in FIG. 14 is combined with the manufacturing process of the display device 1 according to the fifth embodiment of the present application shown in FIGS. 15A to 15P, The above differences will be described in detail.

First, referring to FIGS. 15A to 15B, a first electrode 4, a first bank 5, and a second bank 9 are formed on the substrate 2 and the circuit element layer 3. In, the first deposition hole (shown in FIG. 15C) after sequentially applying the electron injection layer 611, the electron transport layer 612, the shield layer SL and the PR layer of the first organic light emitting layer 61 After placing the mask M (shown in Fig. 15B) where this will be formed, the rest is exposed. Accordingly, the characteristics of the PR layer may be changed so that the remaining regions other than the region where the first deposition hole H1 is to be formed are not etched by the developer.

Since the electron injection layer 611 and the electron transport layer 612 of the first organic emission layer 61 are entirely deposited as a common layer, the electron injection layer 621 and the electron transport layer 622 of the second organic emission layer 62, The electron injection layer 631 and the electron transport layer 632 of the third organic light emitting layer 63 may be used.

The first deposition hole H1 is a hole for forming the light emitting layer 613, the first sub hole transport layer 6161, and the first life improvement layer LIL1 of the first organic emission layer 61, and finally It may be an upper surface of the electron transport layer 612. The PR layer may be a photoresist layer. The emission layer 613 may be a red emission layer that emits red (R) light when an electric field is formed.

Next, referring to FIG. 15C, a primary removal process is performed in which a PR layer located in a region where the first deposition hole H1 is to be formed is removed using a developer. The PR layer removed by the developer can be removed by corrosion by being immersed in the developer.

Next, referring to FIG. 15D, a second removal process is performed to remove the shield layer SL located in the region where the first deposition hole H1 is to be formed using a developer. At this time, in the second removal process, by increasing the time immersed in the developer compared to the first removal process, the volume of the shield layer SL removed compared to the first removal process is increased, so-called undercut, UC) region. Therefore, the width of the shield layer SL removed by the secondary removal process may be wider than the width of the PR layer removed by the first removal process.

Next, referring to FIG. 15E, an emission layer 613 of the first organic emission layer 61 is formed on the electron transport layer 612 disposed in the first deposition hole H1. For example, a light emitting layer 613 of the first organic emission layer 61 may be formed by supplying and depositing organic materials in various ways toward the upper surfaces of the electron transport layer 612 and the PR layer outside the PR layer. In this case, the light emitting layer 613 may be deposited on the upper surface of the electron transport layer 612 through the first deposition hole H1. Meanwhile, a light emitting layer 613 may be deposited on the PR layer due to this process.

Next, referring to FIG. 15F, a first sub hole transport layer 6161 is deposited to surround the light emitting layer 613 of the first organic emission layer 61. More specifically, the first sub hole transport layer 6161 may contact each of the top surface 6131 and the side surface 6132 of the light emitting layer 613 through the first deposition hole H1. At this time, since the first sub hole transport layer 6161 is deposited after the light emitting layer 613 is formed, the top surface of the electron transport layer 612 may be contacted while covering the light emitting layer 613. On the other hand, the first sub hole transport layer 6161 may be deposited on the light emitting layer 613 such that the thickness is 100 mm or more in a sputtering manner. Therefore, the first sub hole transport layer 6161 may protect the light emitting layer 613 so that the light emitting layer 613 of the first organic light emitting layer 61 is not damaged by an etchant used in a subsequent process.

Next, referring to FIG. 15G, except for the first sub hole transport layer 6161 surrounding the light emitting layer 613 of the first organic light emitting layer 61 and the light emitting layer 613 of the first organic light emitting layer 61, The third removal process is performed. The third removal process is the first sub-pixel 21 except for the light emitting layer 613 and the first sub-hole transport layer 6161 of the first organic emission layer 61 formed on the upper surface of the electron transport layer 612, the first Strip process of banks including one bank 5 and the second bank 9, and a shield layer SL applied on the second sub-electrode 42 and the third sub-electrode 43 It can be achieved by lift-off through (Lift-off). Accordingly, only the light emitting layer 613 whose upper surface 6131 and the side surface 6132 are protected by the first sub hole transport layer 6161 may remain on the upper surface of the electron transport layer 612 in the first sub pixel 21. . Therefore, the first sub hole transport layer 6161 prevents the etchant used in the subsequent process from contacting the luminescent layer 613 of the first organic luminescent layer 61, thereby luminescent layer of the first organic luminescent layer 61 by the etchant ( 613) can be prevented from being damaged.

Next, referring to FIG. 15H, after sequentially applying the first life improvement layer LIL1 and the PR layer, after placing the mask M where the second deposition hole H2 (shown in FIG. 15I) will be formed, The rest is exposed. Accordingly, characteristics of the PR layer may be changed so that the remaining regions other than the region where the second deposition hole H2 is to be formed are not etched by the developer.

The second deposition hole H2 is a hole for forming the light emitting layer 623 and the first sub hole transport layer 6251 of the second organic light emitting layer 62, and finally will be an upper surface of the electron transport layer 612. Can. The emission layer 623 may be a green emission layer that emits green (G) light when an electric field is formed.

Next, referring to FIG. 15I, a primary removal process is performed in which the PR layer located in the region where the second deposition hole H2 is to be formed is removed using a developer. The PR layer removed by the developer can be removed by corrosion by being immersed in the developer.

Next, referring to FIG. 15J, a second removal process of removing the first life improvement layer LIL1 located in the region where the first deposition hole H1 is to be formed using a developer is performed. At this time, in the second removal process, by increasing the time immersed in the developer compared to the first removal process, the undercut (UC) is increased by increasing the volume of the first life improvement layer (LIL1) that is removed compared to the first removal process. ) Can form an area. Accordingly, the width of the first life improvement layer LIL1 removed by the secondary removal process may be wider than that of the PR layer removed by the first removal process.

Next, referring to FIG. 15K, an emission layer 623 of the second organic emission layer 62 is formed on the electron transport layer 612 disposed in the second deposition hole H2. For example, a light emitting layer 623 of the second organic light emitting layer 62 may be formed by supplying and depositing organic materials in various ways toward the upper surfaces of the electron transport layer 612 and the PR layer outside the PR layer. At this time, the light emitting layer 623 may be deposited on the upper surface of the electron transport layer 612 through the second deposition hole H2. Meanwhile, a light emitting layer 623 may be deposited on the PR layer due to this process.

Next, referring to FIG. 15L, a first sub hole transport layer 6161 is deposited to surround the emission layer 623 of the second organic emission layer 62. More specifically, the first sub hole transport layer 6161 may contact each of the upper surface 6321 and the side surface 6322 of the emission layer 623 through the second deposition hole H2. At this time, since the first sub hole transport layer 6161 is deposited after the emission layer 623 is formed, the upper surface of the electron transport layer 612 may be contacted while covering the emission layer 623. On the other hand, the first sub hole transport layer 6161 may be deposited on the light emitting layer 623 such that the thickness is 100 mm or more in a sputtering manner. Therefore, the first sub hole transport layer 6161 may protect the light emitting layer 623 so that the light emitting layer 623 of the second organic light emitting layer 62 is not damaged by an etchant used in a subsequent process.

Next, referring to FIG. 15M, a third removal process is performed to remove the rest of the second organic light emitting layer 62 except for the light emitting layer 623 and the first sub hole transport layer 6241 surrounding the light emitting layer 613. . The third removal process is the second sub-pixel 22 except for the light emitting layer 623 and the first sub-hole transport layer 6221 of the second organic light emitting layer 62 formed on the upper surface of the electron transport layer 612 The first sub-pixel 21, the banks including the first bank 5 and the second bank 9, and the first life improvement layer LIL1 coated on the third sub-electrode 43 are stripped ( Strip) can be achieved by lift-off through the process. At this time, only the first life improvement layer LIL1 disposed to cover the top and side surfaces of the first sub hole transport layer 6161 of the first organic emission layer 61 in the first sub pixel 21 remains partially. A third removal process can be performed.

Therefore, only the light emitting layer 623 having the upper surface 6321 and the side surface 6222 protected by the first sub hole transport layer 6251 may remain on the upper surface of the electron transport layer 612 in the second sub pixel 22. Therefore, the first sub hole transport layer 6201 prevents the etchant used in the subsequent process from contacting the luminescent layer 623 of the second organic luminescent layer 62, so that the luminescent layer of the second organic luminescent layer 62 by the etchant ( 623) can be prevented from being damaged.

On the other hand, by the third removal process, the first life improvement layer LIL1 may be disposed to cover the top and side surfaces of the first sub hole transport layer 6161 covering the top and side surfaces of the light emitting layer 613.

As a result, in the manufacturing process of the display device according to the fifth embodiment of the present application, when forming a part of the second organic light emitting layer 62 in the second sub-pixel 22, the first life improvement layer LIL1 is removed. It can be formed in one sub-pixel 21.

Next, referring to FIG. 15N, by repeatedly performing the above-described processes of FIGS. 15H to 15M, the first sub of the third organic emission layer 63 is disposed on the upper surface of the electron transport layer 612 of the third sub pixel 23. A light emitting layer 633 of a third organic light emitting layer 63 having a top surface and side surfaces protected by a hole transport layer 631 is formed, and a second organic light emitting layer is formed on the top surface of the electron transport layer 612 of the second sub-pixel 22. The light emitting layer 623 whose top and side surfaces are protected by the first sub hole transport layer 6221 of 62 and the second life improvement layer LIL2 so as to cover the top and side surfaces of the first sub hole transport layer 6251. Can be deployed.

As a result, in the manufacturing process of the display device according to the fifth embodiment of the present application, the first sub hole transport layer 6161 and the first life improvement layer LIL1 of the first organic light emitting layer 61 include the first organic light emitting layer 61 ), the lift-off process for forming the light-emitting layer 623 of the second organic light-emitting layer 62 and the light-emitting layer 633 of the third organic light-emitting layer 63 is performed while the top and side surfaces of the light-emitting layer 613 are double-protected Therefore, it is possible to prevent the light emitting layer 613 of the first organic light emitting layer 61 formed first from being damaged by an etchant used in a subsequent process.

Similarly, in the manufacturing process of the display device according to the fifth embodiment of the present application, the first sub hole transport layer 6221 and the second life improvement layer LIL2 of the second organic light emitting layer 62 have a second organic light emitting layer 62. The light emitting layer 623 of the second organic light emitting layer 62 from the etchant used in the lift-off process when the light emitting layer 633 of the third organic light emitting layer 63 is formed while the top and side surfaces of the light emitting layer 623 are double protected It can be prevented from being damaged.

On the other hand, in the third sub-pixel 23, the first sub-hole transport layer 631 of the third organic emission layer 63 is lifted off while protecting the top and side surfaces of the emission layer 633 of the third organic emission layer 63 Since the process is performed, it is possible to prevent the light emitting layer 633 of the third organic light emitting layer 63 from being damaged by the etchant used in the lift-off process.

As described above, in the manufacturing process of the display device according to the fifth embodiment of the present application, when a part of the second organic light emitting layer 62 is formed in the second sub-pixel 22, the first sub-pixel 21 is removed. When the first life improvement layer LIL1 is formed and a part of the third organic light emitting layer 63 is formed in the third sub pixel 23, the second life improvement layer LIL2 is formed in the second sub pixel 22 Therefore, a third life improvement layer cannot be formed on the third sub-pixel 23. Therefore, in the manufacturing process of the display device according to the fifth embodiment of the present application, the remaining common layers may be formed in a state as shown in FIG. 15N.

Meanwhile, although not shown, in the manufacturing process of the display device according to the fifth embodiment of the present application, the first sub hole transport layer 6161 and the first life improvement layer LIL1 protect the emission layer 613, and the first sub Since the lift-off process is performed in a state in which the hole transport layer 6161 and the second life improvement layer LIL2 protect the light emitting layer 623, and the first sub hole transport layer 6431 protects the light emitting layer 633, lift off Even if a washing process for removing residues on the structure more reliably after the process is additionally performed, it is possible to prevent damage to the respective light emitting layers 613, 623, and 633 from the washing liquid used in the washing process. .

Next, referring to FIGS. 15O and 15P, the second sub hole transport layer 6142, the second hole transport layer 615, the hole injection layer 616, and the second electrode 7 of the first organic emission layer 61, And sequentially encapsulating the encapsulation layer 8 to partially complete the manufacturing process.

Here, the second sub hole transport layer 6142, the second hole transport layer 615, and the hole injection layer 616 of the first organic emission layer 61 include a first sub pixel 21, a second sub pixel 22, And a second sub hole transport layer, a second hole transport layer, and a hole injection layer of the second organic light emitting layer 62 because it is a common layer deposited over the third sub pixel 23, and the third organic light emitting layer ( 63) may be a second sub hole transport layer, a second hole transport layer, and a hole injection layer.

As a result, the first sub hole transport layer 6161 and the first life improvement layer LIL1 of the first organic emission layer 61 and the first sub hole transport layer 6221 and the second life improvement of the second organic emission layer 62 are improved. Each of the first sub hole transport layer 6321 of the layer LIL2 and the third organic emission layer 63 is the first organic emission layer 61, the second organic emission layer 62, and the third organic emission layer 63 ) Inside each. More specifically, between the electron transport layer 612 and the second sub hole transport layer 6142, the organic light emitting layers 61, 62, 63 of the light emitting layers 613, 623, 633 of the top and side of the contact, and the electron The light emitting layers 613, 623, and 633 may be sealed to protect the upper surface of the transport layer 612.

Meanwhile, the first life improvement layer LIL1 is driven by pulling electrons to the light emitting layer 613 of the first organic light emitting layer 61 and at the same time enhancing hole injection to increase the exciton generation efficiency of the light emitting layer 613. By reducing the voltage decrease to increase the service life, the second life improvement layer (LIL2) pulls electrons to the light emitting layer 623 of the second organic light emitting layer 62, and at the same time enhances hole injection and exciton of the light emitting layer 623 ( Exciton) It is as described above to reduce the driving voltage decrease and increase the service life by increasing the production efficiency.

However, in the display device 1 according to the fifth embodiment of the present application, since the first life improvement layer LIL1 is disposed on the top surface and the side surface of the light emitting layer 613, electron pulling and holes are also applied to the side surface of the light emitting layer 613. Injection can be strengthened, but since the first electrode 4 and the second electrode 7 are disposed above and below the light emitting layer 613, electron pulling and hole injection may be mainly performed in the vertical direction, which is an electric field formation direction. The same may be applied to the second life improvement layer LIL2 disposed on the second sub-pixel 22.

In summary, in the display device 1 according to the fifth embodiment of the present application, a third life improvement layer is not formed in the third sub-pixel 23 due to a different manufacturing process from the display device according to the fourth embodiment, A first life improvement layer LIL1 may be formed in the first sub-pixel 21, and a second life improvement layer LIL2 may be formed in the second sub-pixel 22. In addition, unlike the display device according to the fourth embodiment, the first life improvement layer LIL1 of the display device 1 according to the fifth embodiment may cover both the top and side surfaces of the first sub hole transport layer 6161. Since the second life improvement layer LIL2 may cover both the top and side surfaces of the first sub-hole transport layer 6421, the top and side surfaces of the light emitting layer 613 of the first organic light emitting layer 61 and the second organic layer Since the top and side surfaces of the light-emitting layer 623 of the light-emitting layer 62 can be double-protected, the light-emitting layers 613 and 623 can be more safely protected from etchant than the fourth embodiment.

In the present specification, the first life improvement layer (LIL1), the second life improvement layer (LIL2), and the third life improvement layer (LIL3) are the first sub hole transport layer (6141, 6241, 6341) and the first Although described as being disposed between the 2 sub hole transport layers 6162, the first life improvement layer LIL1, the second life improvement layer LIL2, and the third life improvement layer LIL3 are not necessarily limited thereto. The light emitting layers 613, 623, 633 and the second electrode 7 between the light emitting layers 613, 623, 633 may not be disposed at different locations. For example, the first life improvement layer LIL1, the second life improvement layer LIL2, and the third life improvement layer LIL3 are between the first hole transport layer and the second hole transport layer 615, and the second It may be installed at any one of the hole transport layer 615 and the hole injection layer 616, and between the hole injection layer 616 and the second electrode (7). As another example, the first life improvement layer LIL1, the second life improvement layer LIL2, and the third life improvement layer LIL3 include a first hole transport layer and a second hole transport layer as one single layer. It may be disposed on the upper or lower side of the hole transport layer.

16A to 16C relate to a display device according to a sixth embodiment of the present application, which relates to a head mounted display (HMD) device. 16A is a schematic perspective view, FIG. 16B is a schematic plan view of a VR (Virtual Reality) structure, and FIG. 16C is a schematic cross-sectional view of an Augmented Reality (AR) structure.

16A, the head mounted display device according to the present application includes a storage case 10 and a head mounting band 12.

The storage case 10 accommodates components such as a display device, a lens array, and an eyepiece therein.

The head mounting band 12 is fixed to the storage case 10. The head mounting band 12 is exemplified to be formed so as to surround both the top and both sides of the user's head, but is not limited thereto. The head mounting band 12 is for fixing the head mounted display on the user's head, and can be replaced with a frame or helmet type structure.

As can be seen in FIG. 16B, the head mounted display device 1 having a VR (Virtual Reality) structure according to the present application includes a display device 2a for the left eye, a display device 2b for the right eye, a lens array 11, and a left eye. The eyepiece 20a and the right eyepiece 20b may be included.

The left-eye display device 2a, the right-eye display device 2b, the lens array 11, and the left-eye eye lens 20a and the right-eye eye lens 20b are housed in the aforementioned storage case 10. .

The display device 2a for the left eye and the display device 2b for the right eye can display the same image, in which case the user can watch the 2D image. Alternatively, the left-eye display device 2a may display a left-eye image and the right-eye display device 2b may display a right-eye image, in which case the user can view a stereoscopic image. Each of the left-eye display device 2a and the right-eye display device 2b may be formed of the display devices according to FIGS. 1 to 14 described above. For example, each of the left-eye display device 2a and the right-eye display device 2b may be an organic light emitting display.

The left-eye display device 2a and the right-eye display device 2b each include a plurality of sub-pixels, a circuit element layer 3, a first electrode 4, a first bank 5, an organic light emitting layer 6, The second electrode 7, the encapsulation layer 8, and the second bank 9 may be included, and various colors may be displayed by combining colors of light emitted from each sub-pixel in various ways.

The lens array 11 may be provided between the left eyepiece lens 20a and the left eye display device 2a while being spaced apart from each of the left eyepiece lens 20a and the left eye display device 2a. That is, the lens array 11 may be positioned in front of the left-eye eyepiece 20a and behind the left-eye display device 2a. In addition, the lens array 11 may be provided between the right eyepiece lens 20b and the right eye display device 2b while being spaced apart from each of the right eyepiece lens 20b and the right eye display device 2b. have. That is, the lens array 11 may be located in front of the right-eye eyepiece lens 20b and behind the right-eye display device 2b.

The lens array 11 may be a micro lens array. The lens array 11 may be replaced with a pin hole array. The image displayed on the display device 2a for the left eye or the display device 2b for the right eye due to the lens array 11 may be enlarged to the user.

The left eye LE of the user may be located in the left eyepiece 20a, and the right eye RE of the user may be located in the right eyepiece 20b.

As can be seen in Figure 16c, the head mounted display device of the AR (Augmented Reality) structure according to the present invention is a left-eye display device (2a), a lens array 11, a left eyepiece (20a), a transmissive reflector (13) , And a transmission window (14). For convenience, only the left eye configuration is shown in FIG. 16C, and the right eye configuration is the same as the left eye configuration.

The left-eye display device 2a, the lens array 11, the left-eye eyepiece 20a, the transmissive reflecting portion 13, and the transmissive window 14 are housed in the aforementioned storage case 10.

The display device 2a for the left eye may be disposed on one side, for example, an upper side of the transmission reflection portion 13 without covering the transmission window 14. Accordingly, the left eye display device 2a may provide an image to the transmissive reflector 13 without obscuring the external background seen through the transmissive window 14.

The left-eye display device 2a may be formed of the electroluminescent display device according to FIGS. 1 to 14 described above. At this time, in FIG. 1 to FIG. 14, an upper portion corresponding to a surface on which an image is displayed, for example, an encapsulation layer 8 or a color filter layer (not shown) faces the transmissive reflecting portion 13.

The lens array 11 may be provided between the left eyepiece 20a and the transmissive reflector 13.

The left eye of the user is located in the left eyepiece 20a.

The transmission reflection part 13 is disposed between the lens array 11 and the transmission window 14. The transmission reflector 13 may include a reflective surface 13a that transmits a portion of light and reflects another portion of light. The reflective surface 13a is formed such that an image displayed on the left eye display device 2a proceeds to the lens array 11. Accordingly, the user can view both the external background and the image displayed by the left-eye display device 2a through the transmission window 14. That is, since the user can view the virtual image and the background of the reality as a single image, augmented reality (AR) can be implemented.

The transmission window 14 is disposed in front of the transmission reflection unit 13.

The present application described above is not limited to the above-described embodiments and the accompanying drawings, and it is generally possible in the technical field to which this application belongs that various substitutions, modifications, and changes are possible without departing from the spirit of the present application It will be clear to those who have the knowledge of Therefore, the scope of the present application is indicated by the claims, which will be described later, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present application.

1: Display device
2: Substrate 3: Circuit element layer
4: First electrode 5: Bank
6 organic light emitting layer 7 second electrode
8: sealing layer 9: second bank
10: storage case 11: lens array
12: head mounting band

Claims (20)

A substrate having a first sub-pixel and a second sub-pixel adjacent to the first sub-pixel;
A first electrode provided on the substrate and including a first sub-electrode provided in the first sub-pixel and a second sub-electrode provided in the second sub-pixel;
An organic emission layer including a first organic emission layer disposed on the first sub-electrode and a second organic emission layer disposed on the second sub-electrode;
A second electrode disposed on the organic light emitting layer; And
A first bank is provided between the first sub-electrode and the second sub-electrode to distinguish the first sub-pixel and the second sub-pixel,
The first organic light emitting layer includes a light emitting layer and a first hole transport layer disposed on the light emitting layer,
The first hole transport layer includes a first sub hole transport layer and a second sub hole transport layer,
The first sub hole transport layer of the first hole transport layer covers the emission layer between the emission layer and the second sub hole transport layer. According to claim 1,
The first organic light emitting layer includes an electron injection layer and an electron transport layer disposed under the light emitting layer, and a second hole transport layer and a hole injection layer disposed above the second sub hole transport layer,
A display device having both ends of the electron injection layer, the electron transport layer, the light emitting layer, and the first sub hole transport layer of the first organic emission layer coincide with each other. According to claim 2,
The second organic light emitting layer includes an electron injection layer, an electron transport layer, a light emitting layer, a first hole transport layer including a first sub hole transport layer and a second sub hole transport layer, a second hole transport layer, and a hole injection layer,
The electron injection layer, the electron transport layer, the light emitting layer, and the first sub hole transport layer of the first organic light emitting layer are display devices spaced apart from the electron injection layer, the electron transport layer, the light emitting layer, and the first sub hole transport layer of the second organic light emitting layer. According to claim 2,
The second organic light emitting layer includes an electron injection layer, an electron transport layer, a light emitting layer, a first hole transport layer including a first sub hole transport layer and a second sub hole transport layer, a second hole transport layer, and a hole injection layer,
The second sub hole transport layer, the second hole transport layer, and the hole injection layer of the first organic light emitting layer is a display device connected to the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the second organic light emitting layer. The method of claim 3,
The substrate includes a third sub-pixel adjacent to one side of the second sub-pixel,
The first electrode is provided on the substrate, and includes a third sub electrode provided in the third sub pixel,
The organic light emitting layer includes a third organic light emitting layer disposed on the third sub-electrode,
The third organic light emitting layer includes an electron injection layer, an electron transport layer, a light emitting layer, a first hole transport layer including a first sub hole transport layer and a second sub hole transport layer, a second hole transport layer, and a hole injection layer,
The first sub hole transport layer of the third organic emission layer covers the emission layer of the third organic emission layer between the emission layer of the third organic emission layer and the second sub hole transport layer of the third organic emission layer. According to claim 1,
The first organic light emitting layer includes an electron injection layer and an electron transport layer disposed under the light emitting layer, and a second hole transport layer and a hole injection layer disposed above the second sub hole transport layer,
The second organic light emitting layer includes an electron injection layer, an electron transport layer, a light emitting layer, a first hole transport layer including a first sub hole transport layer and a second sub hole transport layer, a second hole transport layer, and a hole injection layer,
The electron injection layer, the electron transport layer, the second sub hole transport layer, the second hole transport layer, and the hole injection layer of the first organic light emitting layer are the electron injection layer, the electron transport layer, the second sub hole transport layer, the second of the second organic light emitting layer A display device connected to each of the hole transport layer and the hole injection layer. The method of claim 6,
A display device in contact with the electron transport layer of the first organic light emitting layer while the first sub hole transport layer of the first organic light emitting layer covers the top and side surfaces of the light emitting layer of the first organic light emitting layer. The method of claim 6,
The light emitting layer and the first sub hole transport layer of the first organic light emitting layer are a display device spaced apart from each of the light emitting layer and the first sub hole transport layer of the second organic light emitting layer. The method of claim 5,
A display device having a first sub hole transport layer of the first organic light emitting layer, a first sub hole transport layer of the second organic light emitting layer, and a first sub hole transport layer of the third organic light emitting layer having different thicknesses, respectively. The method of claim 5,
A first life improvement layer disposed between the first sub hole transport layer and the second sub hole transport layer of the first organic light emitting layer;
A second life improvement layer disposed between the first sub hole transport layer and the second sub hole transport layer of the second organic light emitting layer; And
And a third life improvement layer disposed between the first sub hole transport layer and the second sub hole transport layer of the third organic light emitting layer,
The first life improvement layer enhances electron pulling and hole injection into the light emitting layer of the first organic light emitting layer,
The second life improvement layer enhances electron pulling and hole injection into the light emitting layer of the second organic light emitting layer,
The third life improvement layer is a light emitting layer of the third organic light emitting layer, a display device for enhancing electron pulling and hole injection. The method of claim 10,
The first life improvement layer is disposed only on the top surface of the first sub hole transport layer of the first organic light emitting layer,
The second life improvement layer is disposed only on the top surface of the first sub hole transport layer of the second organic light emitting layer,
The third life improvement layer is a display device disposed only on an upper surface of the first sub hole transport layer of the third organic light emitting layer. The method of claim 10,
The first life improvement layer, the second life improvement layer, and the third life improvement layer is a display device including F, O, N. The method of claim 10,
The thickness of each of the first life improvement layer, the second life improvement layer, and the third life improvement layer is 1 nm or more and 10 nm or less. The method of claim 6,
A first life improvement layer disposed between the first sub hole transport layer and the second sub hole transport layer of the first organic light emitting layer; And
And a second life improvement layer disposed between the first sub hole transport layer and the second sub hole transport layer of the second organic light emitting layer,
The first life improvement layer enhances electron pulling and hole injection into the light emitting layer of the first organic light emitting layer,
The second life improvement layer is a light emitting layer of the second organic light emitting layer, a display device for enhancing electron pulling and hole injection. The method of claim 14,
The first life improvement layer is disposed on the top and side surfaces of the first sub hole transport layer of the first organic light emitting layer,
The second life improvement layer is a display device disposed on an upper surface and a side surface of the first sub hole transport layer of the second organic light emitting layer. The method according to any one of claims 1 to 15,
A display device further comprising a lens array spaced apart from the substrate, and a storage case accommodating the substrate and the lens array. The method according to any one of claims 1 to 15,
The first electrode is a cathode electrode, the second electrode is an anode electrode,
The first electrode is a display device connected to a source electrode or a drain electrode of a transistor. The method according to any one of claims 1 to 15,
The first sub hole transport layer and the second sub hole transport layer are formed of the same material. The method according to claim 2 or 6,
The second sub hole transport layer and the second hole transport layer are provided with different materials. The method according to any one of claims 1 to 8,
The difference between the LUMO energy level of the first sub hole transport layer and the LUMO energy level of the second sub hole transport layer is 0.2 eV or more and 0.5 eV or less,
The difference between the HOMO energy level of the first sub hole transport layer and the HOMO energy level of the second sub hole transport layer is 0.2 eV or more and 0.5 eV or less.

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