KR102370972B1 - Organic light emitting diode display device - Google Patents

Abstract

An object of the present invention is to provide a method capable of improving the reduction in the lifespan of an organic light emitting diode while improving carrier injection and transport efficiency.
To this end, in the organic light emitting diode display device of the present invention, a magnetic induction coil pattern for generating a magnetic field in each pixel region is formed along the periphery of the organic light emitting diode.
Accordingly, the energy barrier between the stacked layers of the organic light emitting diode is lowered and a taper is formed at the energy level, so that the injection and transport efficiency of carriers is improved, and the life span due to the conventional strong electric field can be improved. there will be

Description

Organic light emitting diode display device

The present invention relates to an organic light emitting diode display, and more particularly, to an organic light emitting diode display capable of improving lifespan reduction while improving injection and transport of a carrier.

Recently, a flat panel display having excellent characteristics such as reduction in thickness, weight reduction, and low power consumption has been widely developed and applied to various fields.

Among flat panel display devices, an organic light emitting diode display device (OLED display device), also called an organic electroluminescent display device or an organic electroluminescent display device, includes a cathode and a hole as electron injection electrodes. It is a device that emits light by injecting electric charge into the light emitting layer formed between the anode, which is the injection electrode, and extinguishing after pairing of electrons and holes.

Such an organic light emitting diode display can be formed on a flexible substrate such as plastic, and because it is a self-luminous type, the contrast ratio is large, and the response time is several microseconds (㎲), so moving images are realized. This is easy, there is no restriction on the viewing angle, and it is stable even at low temperatures, and it can be driven with a relatively low voltage of 5V to 15V of DC, so it is easy to manufacture and design a driving circuit.

1 is a diagram showing the structure of a general organic light emitting diode as a band diagram.

As shown in FIG. 1 , in the organic light emitting diode, a light emitting material layer 4 is positioned between an anode 1 which is an anode and a cathode 7 which is a cathode. In order to inject holes from the anode 1 and electrons from the cathode 7 into the light emitting material layer 4 , between the anode 1 and the light emitting material layer 4 and between the cathode 7 and the light emitting material layer 4 ) between the hole transport layer (hole transport layer) (3) and the electron transport layer (electron transport layer) (5) is positioned. At this time, in order to more efficiently inject holes and electrons, a hole injection layer 2 is formed between the anode 1 and the hole transport layer 3 , and electrons are disposed between the electron transport layer 5 and the cathode 7 . It further comprises an electron injection layer (6).

In the band diagram of Figure 1, the lower line is the highest energy level of the valence band, called HOMO (highest occupied molecular orbital), and the upper line is the lowest energy level of the conduction band, LUMO (LUMO). It is called the lowest unoccupied molecular orbital). The energy difference between the HOMO level and the LUMO level becomes a band gap.

In the organic light emitting diode having such a structure, holes (+) injected from the anode 1 and transported to the light emitting material layer 4 through the hole injection layer 2 and the hole transport layer 3, and from the cathode 7 Electrons (-) injected and transported to the light emitting material layer 4 through the electron injection layer 6 and the electron transport layer 5 combine to form an exciton 8, and from the exciton 8 Light of a color corresponding to the band gap of the light emitting material layer 4 is emitted.

Here, in order to inject holes (+) and electrons (-), which are carriers, from the corresponding electrodes and transport them to the light emitting material layer 4 , it is necessary to cross the energy barrier between the stacked layers positioned on the injection and transport paths. However, it is important to design the device structure in consideration of the energy level of each stacked layer. For example, if the work function of the anode 1 and the HOMO level of the hole injection layer 2 are similar, hole injection will be easy.

However, it is true that there are many difficulties in adjusting the energy level while giving a role suitable for the physical and chemical properties of the material and each laminated layer.

Meanwhile, in order to improve carrier injection and transport efficiency, a method of lowering the energy barrier by generating a strong electric field between the anode and the cathode may be used. However, in order to generate a strong electric field, a high voltage must be applied to the two electrodes, and accordingly, the organic layer is deteriorated and the lifespan of the organic light emitting diode is reduced.

An object of the present invention is to provide a method capable of improving the reduction in the lifespan of an organic light emitting diode while improving carrier injection and transport efficiency.

In order to achieve the above object, the present invention provides an organic light emitting diode positioned in a pixel region on a substrate, the organic light emitting diode including a first electrode on a protective film, an organic light emitting layer on the first electrode, and a second electrode on the organic light emitting layer, , located in the pixel area, surrounding the organic light emitting diode, and providing an organic light emitting diode display including a magnetic induction coil pattern for generating a magnetic field along a forward direction of the organic light emitting diode.

Here, the magnetic induction coil pattern may include a plurality of partial patterns, and the adjacent partial patterns may be connected to each other through a coil contact hole formed in at least one insulating layer positioned therebetween.

The plurality of partial patterns may include a second partial pattern positioned on the same layer as the first electrode.

The plurality of partial patterns may include a first partial pattern positioned under the passivation layer.

The plurality of partial patterns may include a third partial pattern positioned between a first bank on the passivation layer and a second bank on the first bank.

The first partial pattern may be positioned between the insulating layer on the driving thin film transistor connected to the organic light emitting diode and the passivation layer on the insulating layer.

The first bank may have hydrophilicity and the second bank may have hydrophobicity.

The partial pattern may have a 'a' or 'b' shape, a 'c' shape, or an open 'ㅁ' shape.

In the present invention, a magnetic induction coil pattern for generating a magnetic field in each pixel area is formed along the periphery of the organic light emitting diode.

Accordingly, the energy barrier between the stacked films of the organic light emitting diode is lowered and a taper is formed at the energy level, so that the injection and transport efficiency of carriers is improved, and the life span due to the conventional strong electric field can be improved. there will be

1 is a diagram showing the structure of a general organic light emitting diode as a band diagram.
2 is a circuit diagram of one pixel area of the organic light emitting diode display according to the first embodiment of the present invention;
3 is a diagram schematically illustrating a cross-sectional structure of an organic light emitting diode display device according to a first embodiment of the present invention.
4 to 6 are views schematically showing various examples of the structure of a magnetic induction coil pattern formed in each pixel area according to the first embodiment of the present invention.
7 is a diagram schematically illustrating a cross-sectional structure of an organic light emitting diode display device according to a second embodiment of the present invention.
8 to 10 are diagrams schematically illustrating various examples of the structure of a magnetic induction coil pattern formed in each pixel area according to a second embodiment of the present invention.
11 is a diagram schematically illustrating a cross-sectional structure of an organic light emitting diode display device according to a third embodiment of the present invention.
12 to 14 are diagrams schematically illustrating various examples of the structure of a magnetic induction coil pattern formed in each pixel area according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Meanwhile, in the following embodiments, the same and similar reference numerals are assigned to the same and similar components, and a detailed description thereof may be omitted.

In the organic light emitting diode display device according to the embodiment of the present invention, by forming a magnetic induction coil pattern for generating a magnetic field in each pixel area along the periphery of the organic light emitting diode, the energy barrier between the stacked layers of the organic light emitting diode is lowered and energy This will form a taper in the level. Accordingly, it is possible to improve the injection and transport efficiency of carriers, and also to improve the problem of a decrease in lifespan due to a conventional strong electric field.

Hereinafter, an organic light emitting diode display having a magnetic induction coil pattern configured in various forms will be described in more detail.

<First embodiment>

2 is a circuit diagram of one pixel region of the organic light emitting diode display according to the first embodiment of the present invention.

As shown in FIG. 2 , the organic light emitting diode display according to the first embodiment of the present invention includes a gate line GL and a data line DL that cross each other and define a pixel region P, respectively. A switching thin film transistor Ts, a driving thin film transistor Td, a storage capacitor Cst, and an organic light emitting diode De are formed in the pixel region P of .

The gate electrode of the switching thin film transistor Ts is connected to the gate line GL, and the source electrode is connected to the data line DL. A gate electrode of the driving thin film transistor Td may be connected to a drain electrode of the switching thin film transistor Ts, and a source electrode may be connected to the high potential power voltage VDD. As a first electrode of the organic light emitting diode De, for example, an anode is connected to the drain electrode of the driving thin film transistor Td, and as a second electrode, for example, a cathode has a low potential power voltage VSS ) is connected to The storage capacitor Cst is connected to the gate electrode and the drain electrode of the driving thin film transistor Td.

Looking at the image display operation of the organic light emitting diode display, the switching thin film transistor Ts is turned on according to the gate signal applied through the gate wiring GL, and in synchronization with this, the data line DL is turned on. ) is applied to the gate electrode of the driving thin film transistor Td through the switching thin film transistor Ts.

The driving thin film transistor Td is turned on according to the data signal to control the current flowing through the organic light emitting diode De to emit light, thereby displaying an image.

Here, the amount of current flowing through the organic light emitting diode De is proportional to the size of the data signal, and the intensity of light emitted from the organic light emitting diode De is proportional to the amount of current flowing through the organic light emitting diode De. The region P displays different gradations according to the size of the data signal, and as a result, the organic light emitting diode display displays an image.

The storage capacitor Cst serves to maintain the data signal applied to the gate electrode of the driving thin film transistor Td for one frame.

3 is a diagram schematically illustrating a cross-sectional structure of an organic light emitting diode display according to a first embodiment of the present invention.

In FIG. 3 , the switching transistor is not shown for convenience of description. And, the magnetic induction coil pattern (BCP) is shown in some form.

Referring to FIG. 3 , the organic light emitting diode display 100 according to the first embodiment of the present invention includes a switching thin film transistor (refer to Ts in FIG. 2 ) formed in each pixel region P on a substrate 110 and driving. It may include a thin film transistor Td and an organic light emitting diode De positioned on the thin film transistors and connected to the driving thin film transistor Td. Moreover, the organic light emitting diode display device 100 according to the present embodiment is formed to surround the periphery of the organic light emitting diode De, and a magnetic induction coil induces a magnetic field penetrating the organic light emitting diode De in a vertical direction. A pattern BCP is provided.

If the cross-sectional structure of the organic light emitting diode display 100 having such a configuration will be described in more detail, a patterned semiconductor layer 122 is formed on the substrate 110 .

Here, the substrate 110 may be a glass substrate or a plastic substrate. The semiconductor layer 122 may be made of an oxide semiconductor material. In this case, a light blocking pattern (not shown) and a buffer layer (not shown) may be formed under the semiconductor layer 122 , and the light blocking pattern is formed of the semiconductor layer 122 . By preventing light from being incident, the semiconductor layer 122 is prevented from being deteriorated by the light. As another example, the semiconductor layer 122 may be made of polycrystalline silicon, and in this case, both edges of the semiconductor layer 122 may be doped with impurities.

A gate insulating layer 130 may be formed on the entire surface of the substrate 110 as an insulating layer made of an insulating material on the semiconductor layer 122 . The gate insulating layer 130 may be formed of an inorganic insulating material such as silicon oxide (SiO ₂ ). Meanwhile, when the semiconductor layer 122 is made of polycrystalline silicon, the gate insulating layer 130 may be formed of silicon oxide (SiO ₂ ) or silicon nitride (SiNx).

A gate electrode 132 made of a conductive material such as metal is formed on the gate insulating layer 130 to correspond to the center of the semiconductor layer 122 . In addition, a gate wiring (refer to GL of FIG. 2 ) and a first capacitor electrode (not shown) may be formed on the gate insulating layer 130 . The gate wiring extends along the first direction, and the first capacitor electrode is connected to the gate electrode 132 .

Meanwhile, in the present embodiment, the case in which the gate insulating layer 130 is formed on the entire surface of the substrate 110 is taken as an example, but the gate insulating layer 130 may be patterned in the same shape as the gate electrode 132 .

An interlayer insulating layer 140 as an insulating layer made of an insulating material may be formed on the entire surface of the substrate 110 on the gate electrode 132 . The interlayer insulating layer 140 may be formed of an inorganic insulating material such as silicon oxide (SiO ₂ ) or silicon nitride (SiNx), or an organic insulating material such as benzocyclobutene or photo acryl. .

The interlayer insulating layer 140 may include first and second contact holes 140a and 140b exposing both sides of the semiconductor layer 122 . The first and second contact holes 140a and 140b are positioned on both sides of the gate electrode 132 to be spaced apart from the gate electrode 132 . Furthermore, the first and second contact holes 140a and 140b may also be formed in the gate insulating layer 130 . In contrast, when the gate insulating layer 130 is patterned to have the same shape as the gate electrode 132 , the first and second contact holes 140a and 140b are formed in the interlayer insulating layer 140 .

Source and drain electrodes 152 and 154 are formed on the interlayer insulating layer 140 using a conductive material such as a metal. In addition, a data line (see DL of FIG. 2 ), a power line (not shown), and a second capacitor electrode (not shown) extending in the second direction may be formed on the interlayer insulating layer 140 .

The source and drain electrodes 152 and 154 are spaced apart from the center of the gate electrode 132 and contact both sides of the semiconductor layer 122 through the first and second contact holes 140a and 140b, respectively. Although not shown, the data line extends along the second direction and intersects the gate line to define the pixel region P, and the power line for transmitting the high potential power voltage (see VDD in FIG. 2 ) is spaced apart from the data line. Located. The second capacitor electrode is connected to the drain electrode 154 and overlaps the first capacitor electrode, and the interlayer insulating layer 140 between the two electrodes is used as a dielectric to form a storage capacitor.

Meanwhile, the semiconductor layer 122 , the gate electrode 132 , and the source and drain electrodes 152 and 154 form the driving thin film transistor Td. Here, the driving thin film transistor Td is a coplanar in which the gate electrode 132 and the source and drain electrodes 152 and 154 are positioned on one side of the semiconductor layer 122 , that is, on the semiconductor layer 122 . It may be configured to have a structure.

As another example, the driving thin film transistor Td may have an inverted staggered structure in which a gate electrode is disposed under a semiconductor layer and a source electrode and a drain electrode are positioned above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon.

Meanwhile, although not shown, a switching thin film transistor (see Ts in FIG. 2 ) having the same structure as the driving thin film transistor Td is formed on the substrate 110 . The gate electrode 132 of the driving thin film transistor Td is electrically connected to the drain electrode of the switching thin film transistor, and the source electrode 152 of the driving thin film transistor Td is connected to the power supply line. In addition, the gate electrode and the source electrode of the switching thin film transistor are respectively connected to the gate line and the data line.

A first passivation layer 160 may be formed on the entire surface of the substrate 110 as an insulating layer made of an insulating material on the source and drain electrodes 152 and 154 . The first passivation layer 160 may be formed of an inorganic insulating material such as silicon oxide (SiO ₂ ) or silicon nitride (SiNx).

On the first passivation layer 160 , as an insulating layer made of an insulating material, a second passivation layer 161 may be formed on the entire surface of the substrate 110 . The second passivation layer 161 may be formed of an organic insulating material such as benzocyclobutene or photoacrylic. The second passivation layer 161 functions as a planarization layer so that its top surface is substantially flat.

As such, in the present embodiment, the protective layers 160 and 161 having a double layer structure may be formed on the driving thin film transistor Td. The first and second passivation layers 160 and 161 have a drain contact hole 160a exposing the drain electrode 154 .

A patterned first electrode 162 for each pixel region P may be formed on the second passivation layer 161 . The first electrode 162 contacts the drain electrode 154 through the drain contact hole 160a. The first electrode 162 may be formed of a conductive material having a relatively high work function, for example, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

A bank layer 170 is formed on the first electrode 162 as an insulating film made of an insulating material. The bank layer 170 is disposed to surround each pixel area P along the boundary of the neighboring pixel area P. As shown in FIG. The bank layer 170 has a through hole 170a exposing the first electrode 162 of each pixel region P, and covers the edge of the first electrode 162 .

The bank layer 170 of the present embodiment may be formed in a double layer structure. That is, the bank layer 170 may include a first bank 172 and a second bank 174 on the first bank 172 . In this case, it is preferable that the width of the first bank 172 is wider than the width of the second bank 174 .

The first bank 172 is made of a material having a relatively high surface energy to lower a contact angle with an organic light emitting layer material to be formed later, and the second bank 174 is made of a material having a relatively low surface energy to form an organic light emitting layer material to be formed later. By increasing the contact angle with , it is possible to prevent the light emitting layer material from overflowing into the adjacent pixel area.

Here, the first bank 172 may be made of an inorganic insulating material or an organic insulating material having a hydrophilic property, and the second bank 174 may be made of an organic insulating material having a hydrophobic property.

The organic light emitting layer 180 is formed on the first electrode 162 exposed through the transmission hole 170a of the bank layer 170 .

The organic light emitting layer 180 may be formed in a multilayer structure including the light emitting material layer 183 . In this regard, for example, when the first electrode 162 is an anode and the second electrode 192 is a cathode, a hole injection layer 181 is formed between the first electrode 162 and the light emitting material layer 183 . The hole transport layer 182 may be sequentially disposed, and the electron transport layer 184 and the electron injection layer 185 may be sequentially disposed between the light emitting material layer 183 and the second electrode 192 .

The organic light emitting layer 180 having such a multilayer structure may be formed by various methods such as a solution process and/or a deposition process. Here, a printing method or a coating method may be used as the solution process, and inkjet printing or nozzle printing may be used as the printing method.

For example, as a part of a plurality of organic layers constituting the organic light emitting layer 180 , the hole injection layer 181 , the hole transport layer 182 , and the light emitting material layer 183 are formed by a solution process, and the upper layer, which is an electron transport layer, is formed by a solution process. 184 and the electron injection layer 185 may be formed by a deposition process.

On the other hand, in the case of a color display device having red, green, and blue pixel regions, when the light emitting material layer 183 is formed, for example, the red and green light emitting material layers respectively formed in the red and green pixel regions are mixed with a solution. It is formed by a process, and a blue light emitting material layer may be formed on the entire surface of the substrate by a deposition process in a subsequent process.

As described above, when a solution process is applied to some organic layers constituting the organic light emitting layer 180 to be formed, the mask process for the organic layers is reduced, thereby improving process efficiency.

Furthermore, when the solution process is applied as described above, the thickness uniformity of the organic layer formed by the solution process in the pixel region can be improved by using the bank layer 170 having a double layer structure as in the present embodiment.

A second electrode 192 made of a conductive material having a relatively low work function may be formed on the entire surface of the substrate 110 on the organic light emitting layer 180 . Here, the second electrode 192 may be formed of aluminum, magnesium, silver, or an alloy thereof.

The first electrode 162 , the organic light emitting layer 180 , and the second electrode 192 form an organic light emitting diode De. Here, one of the first and second electrodes 162 and 192 serves as an anode, and the other serves as a cathode.

On the other hand, the organic light emitting diode display 100 according to the present embodiment may be configured as a top emission type in which light emitted from the organic light emitting layer 180 is output to the outside through the second electrode 192 . there is. In this case, the first electrode 162 may have a multilayer structure further including a reflective layer (not shown) made of an opaque conductive material. For example, the reflective layer may be formed of an aluminum-palladium-copper (APC) alloy, and the first electrode 162 may have a triple layer structure of ITO/APC/ITO. In addition, the second electrode 192 has a relatively thin thickness so that light is transmitted, and the light transmittance of the second electrode 192 may be about 45-50%.

As another example, the organic light emitting diode display 100 may be configured as a bottom emission type in which light emitted from the organic light emitting layer 180 is outputted to the outside through the first electrode 162 .

On the other hand, in the present embodiment, it is characterized in that a coil-shaped magnetic induction coil pattern BCP is formed at a position corresponding to the bank layer 170 along the outer region of each pixel area P. The magnetic induction coil pattern (BCP) is each composed of a plurality of partial patterns interposed between adjacent insulating layers.

In this regard, for example, the magnetic induction coil pattern BCP may include first to third partial patterns CP1 to CP3, and the first partial pattern CP1 includes the first and second protective layers 160 and 161 . The second partial pattern CP2 may be disposed between the second passivation layer 161 and the bank layer 170 , and the third partial pattern CP3 may include the first and second banks 172 , 174) can be disposed between.

Here, the second partial pattern CP2 may be formed of the same material on the same layer as the first electrode 162 , and in this case, a separate mask process for forming the second partial pattern CP2 is not required. There are advantages.

The magnetic induction coil pattern BCP configured as above will be described with further reference to FIG. 4 . 4 is a diagram schematically illustrating an example of the structure of a magnetic induction coil pattern formed in each pixel area according to the first embodiment of the present invention. configuration is omitted.

3 and 4 , a magnetic induction coil pattern BCP is formed along the outer region of each pixel area P, and the magnetic induction coil pattern BCP moves around the organic light emitting diode De at least once. It may be formed to wrap. Here, at least once or more means once or twice the real number.

The magnetic induction coil pattern BCP may include first to third partial patterns CP1 to CP3 formed at positions corresponding to the bank layer 170 , and at least one insulating layer is formed between two adjacent partial patterns. is interposed

For example, the first partial pattern CP1 is disposed on the first passivation layer 160 , the second partial pattern CP2 is disposed on the second passivation layer 161 , and the third partial pattern CP3 is The first bank 172 may be disposed above and below the second bank 174 .

Here, the first to third partial patterns CP1 to CP3 are formed along a part of the outer region of the pixel region P, and these first to third partial patterns CP1 to CP3 are continuously connected to each other. When viewed as a whole, it forms a coil shape.

In FIG. 4 , a case in which the first to third partial patterns CP1 to CP3 is formed in an approximately 'L' shape or a 'L' shape to implement the magnetic induction coil pattern BCP is illustrated as an example. Here, the 'a' shape or the 'b' shape is a shape recognized according to the position where the observer looks, and it corresponds to substantially the same shape.

At this time, the second partial pattern CP2 has one end of the second partial pattern CP1 through the coil contact hole formed in the second protective film 160 , that is, the first coil contact hole H1 , and the other end of the first partial pattern CP1 . come into contact In addition, the third partial pattern CP3 has one end and the other end of the second partial pattern CP2 through the coil contact hole formed in the first bank 172 , that is, the second coil contact hole H2 , which is the lower insulating film. come into contact

As such, the adjacent partial patterns come into contact with each other through the coil contact holes formed in the insulating film disposed therebetween, so that the first to third partial patterns CP1 to CP3 are connected as a whole to form the magnetic induction coil pattern BCP. be able to form

In particular, in the magnetic induction coil pattern (BCP), the direction of the magnetic field (B) induced inside the coil is determined according to the direction of the coil current (Ic). The direction of the coil current Ic is determined so that the magnetic field B is generated in the forward direction of the light emitting diode De.

In this regard, when an electric field or a magnetic field is generated along the forward direction in which the light emitting current flows with respect to the organic light emitting diode De, the energy barrier between the stacked layers is lowered and at the same time, a taper occurs in the energy level of the stacked layers, and the injection of carriers and transport efficiency is improved.

In this embodiment, paying attention to this point, the magnetic induction coil pattern BCP is formed along the periphery of the organic light emitting diode De, and the magnetic field B generated by the magnetic induction coil pattern BCP is generated by the organic light emitting diode De. ) to follow the forward direction. Accordingly, similar to the application of the electric field, the energy barrier is lowered and the energy level is taper, so that the carrier injection and transport efficiency can be improved.

Moreover, when an electric field is used as in the prior art, the organic film is deteriorated by the applied high voltage, and thus the lifespan of the organic light emitting diode De is reduced. In this embodiment, the electric field is used by using the magnetic field B. There is an advantage in that it can improve the problem of deterioration in lifespan.

Accordingly, in the present embodiment, the corresponding coil current Ic is applied to the magnetic induction coil pattern BCP so that the magnetic field B is induced in the forward direction of the organic light emitting diode De.

In this regard, for example, when the first electrode 162 of the organic light emitting diode De is the anode and the second electrode 192 is the cathode, the forward direction of the light emitting current is from the first electrode 162 to the second electrode. Since the direction is (192), the coil current Ic is configured to flow in a counterclockwise direction with respect to the reverse direction from the second electrode 192 to the first electrode 162 . Accordingly, a magnetic field B is generated along the forward direction of the organic light emitting diode De.

In order to generate such a magnetic field B, a relatively high first coil voltage V1 is applied to one end of the first partial pattern CP1 for the magnetic induction coil pattern BCP having the form shown in FIG. 4 . and a relatively low second coil voltage V2 is applied to the other end of the third partial pattern CP3 (ie, V1>V2). Accordingly, the coil current Ic flows in the counterclockwise direction in the magnetic induction coil pattern BCP, and the magnetic field ( B) can occur.

As another example, when the first and second electrodes 162 and 192 are cathodes and anodes, respectively, on the contrary, a relatively low second coil voltage V2 is applied to the first partial pattern CP1 to the third partial pattern ( By applying a relatively high first coil voltage (V1) to CP3) so that the coil current (Ic) flows in a clockwise direction in the magnetic induction coil pattern (BCP), similarly, the forward direction of the emission current (that is, the second electrode ( 192) along the direction of the first electrode 162), the magnetic field B can be generated.

On the other hand, it is preferable that the same magnetic field B is generated in all of the pixel regions P to improve uniform carrier injection and transport efficiency. To this end, it is preferable to apply the same first and second coil voltages V1 and V2 to all the pixel regions P. In addition, it is preferable to apply the coil voltages V1 and V2 so that the magnetic field B is continuously applied while the organic light emitting diode display 100 is being driven.

On the other hand, the shape of the partial pattern constituting the magnetic induction coil pattern (BCP) may be formed to have a shape different from that described above. In this regard, FIGS. 5 and 6 may be referred to.

FIG. 5 illustrates a case in which the first to third partial patterns CP1 to CP3 are formed to have an approximately 'C' shape.

Meanwhile, FIG. 6 illustrates a case in which the first to third partial patterns CP1 to CP3 are formed to have an approximately open 'ㅁ' shape. Here, the open 'ㅁ' shape refers to a partially opened shape rather than a closed shape as an overall 'ㅁ' shape.

As such, the number of turns of the coil is larger in the case of FIG. 5 than in FIG. 4, and furthermore, the number of turns of the coil is maximized in the case of FIG. 6 . As such, when the number of turns of the coil increases, the strength of the magnetic field also increases, resulting in an effect of increasing carrier injection and transport efficiency.

Meanwhile, in the above bar, the case where the first to third partial patterns CP1 to CP3 have the same shape has been described as an example, but these partial patterns may be formed in different shapes, for example, the first partial pattern (CP1) may be formed to have a 'L' shape, and the second partial pattern CP2 may be formed to have a 'C' shape.

In addition, although the case where the magnetic induction coil pattern (BCP) composed of a plurality of partial patterns has a substantially rectangular shape in plan view has been described as an example, it may be formed in a polygonal or circular shape other than this.

As such, it is obvious that the partial pattern or the magnetic induction coil pattern (BCP) may be formed in various shapes as needed.

<Second embodiment>

7 is a diagram schematically illustrating a cross-sectional structure of an organic light emitting diode display device according to a second exemplary embodiment of the present invention.

The organic light emitting diode display device 100 according to the second embodiment has substantially the same configuration as the organic light emitting diode display device of the first embodiment, except for the configuration of the magnetic induction coil pattern BCP. . As such, for convenience of description, descriptions of the same and similar components may be omitted.

Meanwhile, in FIG. 7 , for convenience of explanation, the switching transistor is not shown, and some forms of the magnetic induction coil pattern (BCP) are shown.

Referring to FIG. 7 , in the organic light emitting diode display 100 according to the second embodiment of the present invention, a switching thin film transistor (refer to Ts in FIG. 2 ) formed in each pixel region P on a substrate 110 and driving It may include a thin film transistor Td and an organic light emitting diode De positioned on the thin film transistors and connected to the driving thin film transistor Td. Moreover, the organic light emitting diode display device 100 according to the present embodiment is formed to surround the periphery of the organic light emitting diode De, and a magnetic induction coil induces a magnetic field penetrating the organic light emitting diode De in a vertical direction. A pattern BCP is provided.

Meanwhile, the magnetic induction coil pattern BCP according to the present embodiment is composed of two partial patterns CP1 and CP2, which may correspond to the first and second partial patterns CP1 and CP2 of the first embodiment. For convenience of description, the two partial patterns CP1 and CP2 of this embodiment are referred to as first and second partial patterns.

The first partial pattern CP1 may be disposed between the first and second passivation layers 160 and 161 , and the second partial pattern CP2 may be disposed between the second passivation layer 161 and the bank layer 170 . there is.

Here, the second partial pattern CP2 may be formed of the same material on the same layer as the first electrode 162 , and in this case, a separate mask process for forming the second partial pattern CP2 is not required. There are advantages.

In particular, in this embodiment, by configuring the magnetic induction coil pattern BCP with two partial patterns CP1 and CP2, the third partial pattern in the first embodiment can be omitted, and the mask process is relatively reduced. has the advantage of being

The magnetic induction coil pattern BCP configured as above will be described with further reference to FIG. 8 . 8 is a diagram schematically illustrating an example of the structure of a magnetic induction coil pattern formed in each pixel region according to a second embodiment of the present invention. configuration is omitted.

7 and 8 , a magnetic induction coil pattern BCP is formed along the outer region of each pixel area P, and the magnetic induction coil pattern BCP moves around the organic light emitting diode De at least once. It may be formed to wrap. Here, at least once or more means once or twice the real number.

The magnetic induction coil pattern BCP may include first and second partial patterns CP1 and CP2 formed at positions corresponding to the bank layer 170 , and at least one insulating layer is disposed between the two partial patterns. is interposed

For example, the first partial pattern CP1 may be disposed on the first passivation layer 160 , and the second partial pattern CP2 may be disposed on the second passivation layer 161 .

Here, the first and second partial patterns CP1 and CP2 are formed along a part of the outer region of the pixel region P, and the first and second partial patterns CP1 and CP2 are continuously connected to each other. When viewed as a whole, it forms a coil shape.

In FIG. 8 , a case in which the first and second partial patterns CP1 and CP2 are formed in an approximately 'L' shape or a 'L' shape to implement the magnetic induction coil pattern BCP is shown as an example.

At this time, one end of the second partial pattern CP2 comes into contact with the other end of the first partial pattern CP1 through the coil contact hole H1 formed in the second passivation layer 160 that is the insulating layer below.

As such, the two partial patterns CP1 and CP2 come into contact with each other through the coil contact hole H1 formed in the insulating film disposed therebetween, so that the first and second partial patterns CP1 and CP2 are connected as a whole. It is possible to form a magnetic induction coil pattern (BCP).

In particular, in the present embodiment, the corresponding coil current Ic is applied to the magnetic induction coil pattern BCP to induce the magnetic field B in the forward direction of the organic light emitting diode De.

In this regard, for example, when the first electrode 162 and the second electrode 192 of the organic light emitting diode De are the cathode, the forward direction of the emission current is from the first electrode 162 to the second electrode 192 . ) direction, so that the coil current flows in a counterclockwise direction with respect to the reverse direction from the second electrode 192 to the first electrode 162 . Accordingly, a magnetic field B along the forward direction of the organic light emitting diode De is generated.

In order to generate such a magnetic field B, a relatively high first coil voltage V1 is applied to one end of the first partial pattern CP1 for the magnetic induction coil pattern BCP having the form shown in FIG. 8 . and a relatively low second coil voltage V2 is applied to the other end of the second partial pattern CP2 (ie, V1>V2). Accordingly, the coil current Ic flows in the counterclockwise direction in the magnetic induction coil pattern BCP, and the magnetic field ( B) can occur.

As another example, when the first and second electrodes 162 and 192 are cathodes and anodes, respectively, on the contrary, a relatively low second coil voltage V2 is applied to the first partial pattern CP1 to the second partial pattern ( By applying a relatively high first coil voltage (V1) to CP2) so that the coil current (Ic) flows in a clockwise direction in the magnetic induction coil pattern (BCP), similarly, the forward direction of the emission current (that is, the second electrode ( 192) along the direction of the first electrode 162), the magnetic field B can be generated.

On the other hand, it is preferable that the same magnetic field B is generated in all of the pixel regions P to improve uniform carrier injection and transport efficiency. To this end, it is preferable to apply the same first and second coil voltages V1 and V2 to all the pixel regions P. In addition, it is preferable to apply the coil voltages V1 and V2 so that the magnetic field B is continuously applied while the organic light emitting diode display 100 is being driven.

On the other hand, the shape of the partial pattern constituting the magnetic induction coil pattern (BCP) may be formed to have a shape different from that described above. In this regard, FIGS. 9 and 10 may be referred to.

9 illustrates a case in which the first and second partial patterns CP1 and CP2 are formed to have an approximately 'C' shape.

Meanwhile, FIG. 10 shows a case in which the first and second partial patterns CP1 and CP2 are formed to have an approximately open 'ㅁ' shape.

As such, the number of turns of the coil is greater in the case of FIG. 9 than in FIG. 8, and furthermore, in the case of FIG. 10, the number of turns of the coil is maximized. As such, when the number of turns of the coil increases, the strength of the magnetic field also increases, resulting in an effect of increasing carrier injection and transport efficiency.

Meanwhile, in the above bar, the case where the first and second partial patterns CP1 and CP2 have the same shape has been described as an example, but these partial patterns may be formed in different shapes, for example, the first partial pattern (CP1) may be formed to have a 'L' shape, and the second partial pattern CP2 may be formed to have a 'C' shape.

In addition, although the case where the magnetic induction coil pattern (BCP) composed of a plurality of partial patterns has a substantially rectangular shape in plan view has been described as an example, it may be formed in a polygonal or circular shape other than this.

As such, it is obvious that the partial pattern or the magnetic induction coil pattern (BCP) may be formed in various shapes as needed.

On the other hand, in the present embodiment, the magnetic induction coil pattern BCP is constituted by the first and second partial patterns CP1 and CP2, and between the first and second banks 172 and 174 of the double layer structure of the first embodiment. The third partial pattern constructed in is not required. Accordingly, the bank layer 170 of the present embodiment may be formed in a single-layer structure including the second bank 174 .

<Third embodiment>

11 is a diagram schematically illustrating a cross-sectional structure of an organic light emitting diode display device according to a third embodiment of the present invention.

The organic light emitting diode display device according to the third embodiment has substantially the same configuration as the organic light emitting diode display device of the first or second embodiment, except for the configuration of the magnetic induction coil pattern. As such, for convenience of description, descriptions of the same and similar components may be omitted.

Meanwhile, in FIG. 11 , for convenience of explanation, the switching transistor is not shown, and some forms of the magnetic induction coil pattern (BCP) are shown.

Referring to FIG. 11 , in the organic light emitting diode display 100 according to the third embodiment of the present invention, a switching thin film transistor (refer to Ts in FIG. 2 ) formed in each pixel region P on a substrate 110 and driving It may include a thin film transistor Td and an organic light emitting diode De positioned on the thin film transistors and connected to the driving thin film transistor Td. Moreover, the organic light emitting diode display device 100 according to the present embodiment is formed to surround the periphery of the organic light emitting diode De, and a magnetic induction coil induces a magnetic field penetrating the organic light emitting diode De in a vertical direction. A pattern BCP is provided.

Meanwhile, the magnetic induction coil pattern BCP in the present embodiment is composed of two partial patterns CP2 and CP3, which may correspond to the second and third partial patterns CP2 and CP3 of the first embodiment. For convenience of description, the two partial patterns CP1 and CP2 of this embodiment are referred to as second and third partial patterns.

The second partial pattern CP1 may be disposed between the second passivation layer 161 and the bank layer 170 having a double layer structure, and the third partial pattern CP2 includes the first and second banks of the bank layer 170 . It can be placed between (172, 174).

Here, the second partial pattern CP2 may be formed of the same material on the same layer as the first electrode 162 , and in this case, a separate mask process for forming the second partial pattern CP2 is not required. There are advantages.

In particular, in this embodiment, by configuring the magnetic induction coil pattern BCP with two partial patterns CP2 and CP3, the first partial pattern in the first embodiment can be omitted, and the mask process is relatively reduced. has the advantage of being

The magnetic induction coil pattern BCP configured as above will be described with further reference to FIG. 12 . 12 is a diagram schematically illustrating an example of the structure of a magnetic induction coil pattern formed in each pixel region according to a third embodiment of the present invention. configuration is omitted.

11 and 12 , a magnetic induction coil pattern BCP is formed along the outer region of each pixel region P, and the magnetic induction coil pattern BCP moves around the organic light emitting diode De at least once. It may be formed to wrap. Here, at least once or more means once or twice the real number.

The magnetic induction coil pattern BCP may include second and third partial patterns CP2 and CP3 formed at positions corresponding to the bank layer 170 , and at least one insulating layer is disposed between the two partial patterns. is interposed

For example, the second partial pattern CP2 may be disposed on the second passivation layer 161 , and the third partial pattern CP3 may be disposed on the first bank 172 .

Here, the second and third partial patterns CP2 and CP3 are formed along a part of the outer region of the pixel region P, and these second and third partial patterns CP2 and CP3 are continuously connected to each other. When viewed as a whole, it forms a coil shape.

In FIG. 12 , a case in which the second and third partial patterns CP2 and CP3 are formed in an approximately 'L' shape or a 'L' shape to implement the magnetic induction coil pattern BCP is illustrated as an example.

At this time, one end of the third partial pattern CP3 comes into contact with the other end of the second partial pattern CP2 through the coil contact hole H2 formed in the first bank 172 , which is the lower insulating layer.

As such, the two partial patterns CP2 and CP3 come into contact with each other through the coil contact hole H2 formed in the insulating film disposed therebetween, so that the second and third partial patterns CP2 and CP3 are connected as a whole. It is possible to form a magnetic induction coil pattern (BCP).

In particular, in the present embodiment, a corresponding coil current Ic is applied to the magnetic induction coil pattern BCP to induce a magnetic field in the forward direction of the organic light emitting diode De.

In this regard, for example, when the first electrode 162 of the organic light emitting diode De is the anode and the second electrode 192 is the cathode, the forward direction of the emission current is from the first electrode 162 to the second electrode 162 . Since it is the electrode 192 direction, the coil current Ic is configured to flow in a counterclockwise direction with respect to the reverse direction from the second electrode 192 to the first electrode 162 . Accordingly, a magnetic field B along the forward direction of the emission current is generated.

In order to generate such a magnetic field B, a relatively high first coil voltage V1 is applied to one end of the second partial pattern CP2 for the magnetic induction coil pattern BCP of the form shown in FIG. 12 . and a relatively low second coil voltage V2 is applied to the other end of the third partial pattern CP3 (ie, V1>V2). Accordingly, the coil current Ic flows in the counterclockwise direction in the magnetic induction coil pattern BCP, and the magnetic field ( B) can occur.

As another example, when the first and second electrodes 162 and 192 are cathodes and anodes, respectively, on the contrary, a relatively low second coil voltage V2 is applied to the second partial pattern CP2 to the third partial pattern ( By applying a relatively high first coil voltage (V1) to CP3) so that the coil current (Ic) flows in a clockwise direction in the magnetic induction coil pattern (BCP), similarly, the forward direction of the emission current (that is, the second electrode ( 192) along the direction of the first electrode 9162), a magnetic field B can be generated.

Meanwhile, it is preferable that the same magnetic field B is generated in all of the pixel regions P to improve uniform carrier injection and transport efficiency. To this end, it is preferable to apply the same first and second coil voltages V1 and V2 to all the pixel regions P. In addition, it is preferable to apply the coil voltages V1 and V2 so that the magnetic field B is continuously applied while the organic light emitting diode display 100 is being driven.

On the other hand, the shape of the partial pattern constituting the magnetic induction coil pattern (BCP) may be formed to have a shape different from that described above. In this regard, FIGS. 13 and 14 may be referred to.

13 illustrates a case in which the second and third partial patterns CP2 and CP3 are formed to have an approximately 'C' shape.

Meanwhile, FIG. 14 shows a case in which the second and third partial patterns CP2 and CP3 are formed to have an approximately open 'ㅁ' shape.

As such, in the case of FIG. 13 compared to FIG. 12, the number of turns of the coil is greater, and furthermore, in the case of FIG. 14, the number of turns of the coil is maximized. As such, when the number of turns of the coil increases, the strength of the magnetic field also increases, thereby increasing the carrier injection and transport efficiency.

Meanwhile, in the above-mentioned bar, the case where the second and third partial patterns CP2 and CP3 have the same shape has been described as an example, but these partial patterns may be formed in different shapes, for example, the second partial pattern (CP2) may be formed to have a 'L' shape, and the third partial pattern CP3 may be formed to have a 'C' shape.

In addition, although the case where the magnetic induction coil pattern (BCP) composed of a plurality of partial patterns has a substantially rectangular shape in plan view has been described as an example, it may be formed in a polygonal or circular shape other than this.

As such, it is obvious that the partial pattern or the magnetic induction coil pattern (BCP) can be formed in various shapes as needed.

Meanwhile, in the third embodiment, the magnetic induction coil pattern BCP is constituted by the second and third partial patterns CP2 and CP3, and the first and second protective films 160 and 161 having the double layer structure of the first embodiment The first partial pattern constructed in between is not required. Accordingly, in this embodiment, a single-layered protective film may be formed.

In the above-described embodiments, various types of the magnetic induction coil pattern (BCP) have been described as examples. However, the magnetic induction coil pattern BCP may be modified to have a shape other than the shape in the above-described examples. For example, three or more insulating protective layers may be formed under the first electrode, and partial patterns may be formed between adjacent protective layers. In this case, as the number of partial patterns increases and the number of turns of the magnetic induction coil pattern increases, there is an advantage that the strength of the induced magnetic field can be increased.

As described above, in the organic light emitting diode display according to the embodiment of the present invention, a magnetic induction coil pattern for generating a magnetic field in each pixel area is formed along the periphery of the organic light emitting diode.

Accordingly, the energy barrier between the stacked layers of the organic light emitting diode is lowered and a taper is formed in the energy level, so that the injection and transport efficiency of carriers is improved, and the lifespan is reduced due to the conventional strong electric field. can be improved

The above-described embodiment of the present invention is an example of the present invention, and free modifications are possible within the scope included in the spirit of the present invention. Accordingly, the present invention is intended to cover modifications of the present invention provided they come within the scope of the appended claims and their equivalents.

100: liquid crystal display 110: substrate
122: semiconductor layer 130: gate insulating film
132: gate electrode 140: interlayer insulating film
140a: first contact hole 140b: second contact hole
152: source electrode 154: drain electrode
160: first protective film 161: second protective film
160a: drain contact hole 162: first electrode
170: bank layer 172: first bank
174: second bank 180: organic light emitting layer
181: hole injection layer 182: hole transport layer
183: light emitting material layer 184: electron transport layer
185: electron injection layer 192: second electrode
BCP: magnetic induction coil pattern CP1: first partial pattern
CP2: second partial pattern CP3: third partial pattern
H1: first coil contact hole H2: second coil contact hole

Claims (8)

an organic light emitting diode positioned in a pixel region on a substrate, the organic light emitting diode including a first electrode on a passivation layer, an organic light emitting layer on the first electrode, and a second electrode on the organic light emitting layer;
A magnetic induction coil pattern located in the pixel region, surrounding the organic light emitting diode, and generating a magnetic field along a forward direction of the organic light emitting diode
includes,
The magnetic induction coil pattern includes a plurality of partial patterns,
The adjacent partial patterns are connected to each other through a coil contact hole formed in at least one insulating layer positioned therebetween.
delete The method of claim 1,
The plurality of partial patterns includes a second partial pattern positioned on the same layer as the first electrode.
Organic light emitting diode display.
4. The method of claim 3,
The plurality of partial patterns including a first partial pattern positioned under the passivation layer
Organic light emitting diode display.
5. The method according to claim 3 or 4,
The plurality of partial patterns includes a third partial pattern positioned between a first bank on the passivation layer and a second bank on the first bank.
Organic light emitting diode display.
5. The method of claim 4,
The first partial pattern is positioned between the insulating film on the driving thin film transistor connected to the organic light emitting diode and the protective film on the insulating film.
Organic light emitting diode display.
6. The method of claim 5,
The first bank has hydrophilicity and the second bank has hydrophobicity.
Organic light emitting diode display.
The method of claim 1,
The partial pattern has a 'a' or 'b' shape, a 'c' shape, or an open 'ㅁ' shape.
Organic light emitting diode display.

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