KR102358542B1 - Organic light emitting diode panel and organic light emitting diode display and manufacturing method thereof - Google Patents

Abstract

The organic light emitting diode panel 116 according to an embodiment of the present invention has a substrate SUB, an anode electrode Ano disposed on the substrate SUB, and an opening OP exposing the anode electrode Ano. The bank layer BANK, the organic light emitting layer OLE disposed in the opening OP, and overlapping each other corresponding to the edge region of the opening OP, are disposed between the anode electrode Ano and the substrate SUB The first and second color filters CF1 and CF2 may be included.

Description

Organic light emitting diode panel, organic light emitting diode display device, and manufacturing method thereof

The present invention relates to an organic light emitting diode panel, an organic light emitting diode display device, and a manufacturing method thereof.

Recently, various flat panel displays (FPDs) capable of reducing weight and volume, which are disadvantages of cathode ray tubes, have been developed. Such flat panel displays include a liquid crystal display (hereinafter referred to as "LCD"), a field emission display (FED), a plasma display panel (hereinafter referred to as "PDP"), and an electric field. There is a light emitting device (Electroluminescence Device) and the like.

PDP is attracting attention as a display device that is light, thin, and most advantageous for a large screen because of its simple structure and manufacturing process. TFT LCD to which a thin film transistor (hereinafter referred to as "TFT") is applied as a switching element is the most widely used flat panel display element, but since it is a light emitting element, it has a narrow viewing angle and low response speed. In contrast, the electroluminescent device is largely divided into an inorganic light emitting diode display device and an organic light emitting diode display device according to the material of the light emitting layer. It has great advantages in luminance and viewing angle.

The organic light emitting diode display controls the current flowing from the drain to the source of the driving transistor by controlling the voltage between the gate terminal and the source terminal of the driving transistor.

The current flowing from the drain to the source of the driving transistor emits light while flowing to the organic light emitting diode, and the degree of light emission can be controlled by controlling the amount of current.

Meanwhile, Soluble OLED, which is leading the price decline of OLED products, is attracting attention.

Soluble OLED can be manufactured in RGB method without cutting the main board, thereby reducing manufacturing cost. An inkjet printing method may be used to manufacture such a solvable OLED.

1 is a diagram illustrating a pile-up phenomenon in a conventional inkjet printing process.

Referring to FIG. 1 , in order to manufacture a solvable OLED using an inkjet printing process, a bank, which is a structure that can trap ink in units of pixels during the process, is formed. Banks should be hydrophobic, if necessary, so that the ink does not affect adjacent pixels during processing. Due to this, a pile-up phenomenon occurs in which a thick film between the pixel and the bank is formed after the ink is dried. In the current inkjet process, due to the pile-up phenomenon at the pixel edge, as the thickness at the boundary between the pixel and the bank increases, it becomes difficult to write the boundary as the light emitting area, resulting in a decrease in the effective light emitting area. exist. The reduction of the effective light emitting area leads to a decrease in the aperture ratio, which reduces the efficiency and lifespan of the OLED display.

2 is a view showing a conventional two-stage bank structure.

Referring to FIG. 2 , a two-stage bank structure in which an inorganic bank 10 having a hydrophilic property is additionally formed in order to prevent a pile-up phenomenon has been proposed. The two-stage bank is made of a hydrophilic bank (10) at the first stage and a hydrophobic bank (20) at the second stage to induce planarization of the ink film. However, since the bank has to be stacked in two stages, the process conditions are deteriorated and the use of a mask is increased, so there is a problem in that the cost increases.

Embodiments according to the present invention can provide an organic light emitting diode panel and an organic light emitting diode display device, and a method for manufacturing the same, in which the thickness of the ink film is the same over the entire range of the light emitting region through the overlapping structure of color filters.

In addition, an embodiment of the present invention may provide an organic light emitting diode panel and an organic light emitting diode display capable of preventing a reduction in a light emitting area due to a pile-up phenomenon, and a manufacturing method thereof.

In addition, an embodiment according to the present invention provides an organic light emitting diode panel and an organic light emitting diode display device capable of preventing a flattening defect of an ink film due to a pile-up phenomenon without increasing the number of mask processes, and an organic light emitting diode display device and the same A manufacturing method may also be provided.

The organic light emitting diode panel 116 according to an embodiment of the present invention has a substrate SUB, an anode electrode Ano disposed on the substrate SUB, and an opening OP exposing the anode electrode Ano. The bank layer BANK, the organic light emitting layer OLE disposed in the opening OP, and overlapping each other corresponding to the edge region of the opening OP, are disposed between the anode electrode Ano and the substrate SUB The first and second color filters CF1 and CF2 may be included.

In this case, the thickness of the ink film is adjusted to the pixel area by matching the degree of elevation of the organic light emitting layer (OEL) due to the pile-up phenomenon and the degree of elevation of the overcoat layer (OC) according to the first overlapping area (SP1). The same can be done over the range. Accordingly, not only the thickness h1 of the cathode electrode layer Cat but also the thickness h2 of the organic light emitting layer OLE may be uniformly formed over the entire region.

Although the existing pile-up bank layer (BANK) and the end area, that is, the area where pile-up occurs, were not used as the light emitting area, an effective light emitting area was formed by forming an organic light emitting layer (OLE) of the same thickness. can increase

In addition, since the bank layer BANK is not additionally required, the number of processes is reduced, and the cost is reduced by reducing the mask.

In addition, the substrate SUB of the organic light emitting diode panel 116 according to the embodiment of the present invention is defined by one gate line G and a plurality of data lines Dm-1, Dm, and Dm+1. n-1, n, and n+1-th pixel areas are included, the first color filter CF1 is disposed in the emission area AA of the n-th pixel area, and the second color filter CF2 is It may be disposed in an n−1 th pixel area or an n+1 th pixel area to extend to an edge area of the opening OP. In addition, in the organic light emitting diode panel 116 according to the embodiment of the present invention, when the second color filter CF2 is disposed in the n-1 th pixel area, the second color filter CF2 is formed in the opening OP. ) extends to one side of the edge area to overlap one side of the first color filter CF1 , and is disposed in the n+1th pixel area to extend to the other side of the edge area of the opening OP to overlap the first color filter CF1 . A third color filter CF3 overlapping the other side of the color filter CF1 may be further included. In this way, when the color filter in the pixel area adjacent to the corresponding pixel is formed, it can be extended to the corresponding pixel and overlapped with the color filter of the corresponding pixel, so that an additional process is not required, thereby reducing the manufacturing time and manufacturing cost and reducing the effective light emission. area can be increased.

In addition, the overlapping area SP1 or SP2 of the first and second color filters CF1 and CF2 of the organic light emitting diode panel 116 according to the embodiment of the present invention has an inclined surface, and the organic light emitting layer OLE is the It may have an inclination corresponding to the inclined surface. In addition, the inclined surface may have an inclination in a direction corresponding to the inclination of the inner surface of the opening OP.

In addition, the organic light emitting layer OLE of the organic light emitting diode panel 116 according to an embodiment of the present invention includes an organic material emitting white light, and the first color filter CF1 is any one of red, green, and blue. It may include an organic material emitting light of one color.

In addition, the inclined surface is disposed between the anode electrode Ano and the first and second color filters CF1 and CF2 of the organic light emitting diode panel 116 according to the embodiment of the present invention to correspond to the overlapping area SP. It may further include an overcoat layer (OC) having

In addition, the organic light emitting diode display device according to the embodiment of the present invention includes a bank having a substrate SUB, an anode electrode Ano disposed on the substrate SUB, and an opening OP exposing the anode electrode Ano. A layer BANK, an organic light emitting layer OLE disposed in the opening OP, overlapping each other corresponding to an edge region of the opening OP, and disposed between the anode Ano and the substrate SUB An organic light emitting diode panel 116 including first and second color filters CF1 and CF2 and a cathode electrode layer Cat disposed in the opening OP, and the anode electrode Ano and the cathode electrode layer Cat The organic light emitting layer OLE may include a driving circuit 118 and 120 for applying an electric field therebetween, and the organic light emitting layer OLE may be a bottom emission type that emits light in the direction of the color filters CF1 and CF2 by the electric field.

In addition, the substrate SUB of the organic light emitting diode display according to an embodiment of the present invention has n− defined by one gate line G and a plurality of data lines Dm−1, Dm, and Dm+1. 1 , n , and n+1th pixel areas are included, the first color filter CF1 is disposed in the emission area AA of the nth pixel area, and the second color filter CF2 is the n− It is disposed in the first or n+1-th pixel area and may extend to an edge area of the opening OP.

In addition, when the second color filter CF2 of the organic light emitting diode display device according to an embodiment of the present invention is disposed in the n-1 th pixel area, the second color filter CF2 is formed in the opening OP. It extends to one side of the edge region and overlaps with one side of the first color filter CF1, and in the organic light emitting diode display according to the embodiment of the present invention, it is disposed in the n+1th pixel region to form the opening OP. The third color filter CF3 may further include a third color filter CF3 extending to the other side of the edge region and overlapping the other side of the first color filter CF1 .

In addition, the overlapping area SP1 or SP2 of the first and second color filters CF1 and CF2 of the organic light emitting diode display according to the embodiment of the present invention has an inclined surface, and the organic light emitting layer OLE is on the inclined surface. It may have a corresponding inclination, and in the organic light emitting diode display according to an embodiment of the present invention, it is disposed between the anode electrode Ano and the first and second color filters CF1 and CF2 and the overlapping area SP ) may further include an overcoat layer (OC) having an inclined surface corresponding to the .

In addition, the organic light emitting diode panel 116 according to the embodiment of the present invention is a substrate having n-1, n, and n+1-th pixel regions defined by one gate line G and a plurality of data lines D. preparing (SUB), forming a first color filter CF1 in the n-th pixel area, and overlapping one end of the first color filter CF1 to the n-1 th or n+1 th pixel forming a second color filter CF2 in the region and the n-th pixel region, forming an overcoat layer OC on the color filters CF1 and CF2, an anode electrode on the overcoat layer OC Forming (Ano), forming a bank layer (BANK) having an opening (OP) corresponding to the emission area (AA) of the n-th pixel area, and an organic light-emitting layer (BANK) in the opening (OP) by an inkjet method It can be manufactured by proceeding with the step of forming OLE). In this case, color filters for the same color may be formed at once through the same process.

In addition, when manufacturing the organic light emitting diode panel 116 according to the embodiment of the present invention, the overlapping area SP of the first and second color filters CF1 and CF2 may correspond to the edge area of the opening OP. . In addition, the organic light emitting layer OLE may be piled up on the inner surface of the opening OP. As such, the overlapping area SP is formed to be higher than the area where the color filter is alone, so that the thickness of the organic light emitting layer OLE according to the pile-up on the inner surface of the opening OP is increased. ) can be prevented from being thicker than the thickness of the organic light emitting layer (OLE) in the center.

The embodiment according to the present invention can prevent the reduction of the light emitting area due to the pile-up phenomenon, and the ink film according to the pile-up phenomenon can be prevented without increasing the number of mask processes. It is possible to provide an organic light emitting diode panel and an organic light emitting diode display device, and a manufacturing method thereof, in which the thickness of the ink film is the same over the entire range of the light emitting region through the overlapping structure of color filters to prevent planarization defects.

1 is a view showing a pile-up phenomenon in a conventional inkjet printing process.
2 is a view showing a conventional two-stage bank structure.
3 is a view showing the structure of an organic light emitting diode.
4 is a circuit diagram equivalently showing one pixel in an organic light emitting diode display according to an embodiment of the present invention;
5 is a block diagram illustrating an organic light emitting diode display according to an embodiment of the present invention.
6 is an equivalent circuit showing the structure of an OLED pixel according to the first embodiment.
7 is a view showing the structure of an OLED pixel of a bottom emission type cut along a perforated line AB;
FIG. 8 is an enlarged view of a dotted line portion of FIG. 7 ;
9 is an equivalent circuit showing the structure of an OLED pixel according to the second embodiment.
10 is a view showing the structure of an OLED pixel of a bottom emission type cut by a perforated line CD;
11 is a comparative example illustrating a boundary between a light emitting area and a non-emission area when no color filter overlap is used.
12 is an experimental example showing a boundary between a light-emitting area and a non-emission area when color filter overlap is used;

Hereinafter, an organic light emitting diode panel and an organic light emitting diode display device and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers refer to like elements throughout.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

Reference to an element or layer to another element or “on” or “on” includes not only directly on the other element or layer, but also with other layers or other elements interposed therebetween. do. On the other hand, reference to an element "directly on" or "directly on" indicates that there are no intervening elements or layers.

Spatially relative terms "below, beneath", "lower", "above", "upper", etc. are one element or component as shown in the drawings. and can be used to easily describe the correlation with other devices or components. The spatially relative term should be understood as a term including different directions of the device during use or operation in addition to the directions shown in the drawings. For example, when an element shown in the figures is turned over, an element described as "beneath" or "beneath" another element may be placed "above" the other element. Accordingly, the exemplary term “below” may include both directions below and above.

The terminology used herein is for the purpose of describing the embodiments, and thus is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations, and/or elements mentioned. or addition is not excluded.

<Structure of organic light emitting diode>

3 is a view showing the structure of an organic light emitting diode.

The organic light emitting diode panel and the organic light emitting diode display may include an organic light emitting diode as shown in FIG. 3 .

The organic light emitting diode may include an organic compound layer (HIL, HTL, EML, ETL, EIL) formed between the anode electrode and the cathode electrode.

The organic compound layer includes a hole injection layer (HIL), a hole transport layer (HTL), an emission layer (EML), an electron transport layer (ETL) and an electron injection layer (Electron Injection layer, EIL) may be included.

When a driving voltage is applied to the anode and cathode electrodes, holes passing through the hole transport layer (HTL) and electrons passing through the electron transport layer (ETL) are moved to the light emitting layer (EML) to form excitons, and as a result, the light emitting layer (EML) is produces visible light.

In addition, the organic light emitting diode varies the type and concentration of the dopant of the light emitting layer (EML) according to the color to be displayed to obtain red, green or blue colors and stacking them to form white. It can be an organic light emitting diode.

The organic light emitting diode display device arranges the pixels including the organic light emitting diode in a matrix form and controls the brightness of the pixels selected by the scan pulse according to the gray level of digital video data.

Such an organic light emitting diode display device is divided into a passive matrix method and an active matrix method using a TFT as a switching element.

Among them, the active matrix method selects a pixel by selectively turning on the TFT, which is an active element, and maintains the light emission of the pixel with a voltage maintained in a storage capacitor.

<Equivalent circuit diagram of active matrix pixel>

4 is a circuit diagram equivalently showing one pixel in an organic light emitting diode display according to an embodiment of the present invention.

Referring to FIG. 4 , the pixels of the organic light emitting diode display according to the embodiment of the present invention include an organic light emitting diode (OLED), a data line (D) and a gate line (G) crossing each other, and the pixel on the gate line (G). A scan switch (SW) for sequentially transferring data to pixels in a scan pulse (SP), a driving switch (DR) that generates a current by a voltage between the gate and source terminals, and a drive switch (DR) for storing data and maintaining it for a certain time A storage capacitor Cst is provided. The scan switch SW and the driving switch DR may be formed of an N-type MOS-FET.

As described above, a structure composed of two transistors (SW, DR) and one capacitor (Cst) can be simply referred to as a 2T-1C structure.

The scan switch SW is turned on in response to the scan pulse SP from the gate line G to conduct a current path between its source electrode and the drain electrode.

During the on-time period of the scan switch SW, the data voltage from the data line D is applied to the gate electrode and the storage capacitor Cst of the driving switch DR via the source electrode and the drain electrode of the scan switch SW. is authorized

The driving switch DR controls the current flowing through the organic light emitting diode OLED according to the difference voltage Vgs between its gate electrode and the source electrode.

The storage capacitor Cst maintains the voltage supplied to the gate electrode of the driving switch DR constant for one frame period by storing the data voltage applied to one electrode of the storage capacitor Cst.

The organic light emitting diode OLED implemented with the structure shown in FIG. 3 is connected between the source electrode of the driving switch DR and the low potential driving voltage source VSS.

The current flowing through the organic light emitting diode (OLED) is proportional to the brightness of the pixel, which is determined by the gate-source voltage of the driving switch (DR).

The brightness of the pixel shown in FIG. 4 is proportional to the current flowing through the organic light emitting diode (OLED) as shown in Equation 1 below.

Equation 1

는 구동 스위치(DR)의 이동도 및 기생용량에 의해 결정되는 상수값을 각각 의미한다.Here, 'Vgs' is the difference voltage between the gate voltage Vg and the source voltage Vs of the driving switch DR, 'Vdata' is the data voltage, 'Vinit' is the initialization voltage, 'Ioled' is the driving current, 'Vth' is the threshold voltage of the drive switch (DR),

denotes a constant value determined by the mobility and parasitic capacitance of the driving switch DR, respectively.

<Block diagram of organic light emitting diode display device>

5 is a block diagram illustrating an organic light emitting diode display device according to an embodiment of the present invention.

Referring to FIG. 5 , an organic light emitting diode display device according to an embodiment of the present invention includes a display panel 116 , a gate driving circuit 118 , a data driving circuit 120 , and a timing controller 124 which are organic light emitting diode panels. can be provided

개의 화소들(122)을 구비할 수 있다.The display panel 116 has m pairs of m data lines D1 to Dm, k sensing lines S1 to Sk, and n gate lines G1 to Gn and j corresponding to each other on a one-to-one basis. formed in the intersection area of the sensing control lines SC1 to SCj.

The number of pixels 122 may be provided.

Signal lines supplying the first driving power Vdd and the signal wirings supplying the second driving power Vss to each of the pixels 122 may be formed on the display panel 116 . Here, the first driving power Vdd and the second driving power Vss may be generated from the high potential driving voltage source VDD and the low potential driving voltage source VSS, respectively.

The gate driving circuit 118 may generate a scan pulse SP in response to the gate control signal GDC from the timing controller 124 and sequentially supply the scan pulses SP to the gate lines G1 to Gn.

Also, the gate driving circuit 118 may be controlled from the timing controller 124 to output the sensing control signal SCS, and a sensing switch in each pixel may be controlled by the sensing control signal SCS.

It has been described that the gate driving circuit 118 outputs both the scan pulse SP and the sensing control signal SCS, but is not limited thereto, and is controlled by the timing controller 124 to generate the sensing control signal SCS. A separate sensing switch control driver capable of outputting may be provided.

The data driving circuit 120 may be controlled by a data control signal DDC from the timing controller 124 and output a data voltage to the data lines D1 to Dm and a sensing voltage to the sensing lines S1 to Sk. can

Each of the data lines D1 to Dm may be respectively connected to each pixel 122 to apply a data voltage to each of the pixels 122 .

Each of the sensing lines S1 to Sk may be connected to the pixel 122 to supply a sensing voltage, and may measure the sensing voltage on the sensing lines S1 to Sk. Specifically, by supplying the initialization voltage using one sensing line S1 to Sk, the sensing voltage using charging and floating as the initialization voltage can be detected.

Although it has been described that the data driving circuit 120 can output or detect the data voltage and the sensing voltage, the present invention is not limited thereto, and a separate driver capable of outputting or detecting the sensing voltage may be provided.

<Equivalent circuit diagram of the pixel structure according to the first embodiment>

6 is an equivalent circuit illustrating the structure of an OLED pixel according to the first embodiment, and FIG. 7 is a diagram illustrating the structure of an OLED pixel of a bottom emission type cut along the perforated line A-B.

4 to 7 , an organic light emitting diode panel 116 according to an embodiment of the present invention includes a substrate SUB, an anode electrode Ano disposed on the substrate SUB, and the anode electrode Ano. A bank layer BANK having an opening OP to expose and first and second color filters CF1 and CF2 disposed between the substrate SUB.

In addition, the substrate SUB of the organic light emitting diode panel 116 according to the embodiment of the present invention is defined by one gate line G and a plurality of data lines Dm-1, Dm, and Dm+1. n-1, n, and n+1-th pixel areas are included, the first color filter CF1 is disposed in the emission area AA of the n-th pixel area, and the second color filter CF2 is It may be disposed in an n−1 th pixel area or an n+1 th pixel area to extend to an edge area of the opening OP. In addition, in the organic light emitting diode panel 116 according to the embodiment of the present invention, when the second color filter CF2 is disposed in the n-1 th pixel area, the second color filter CF2 is formed in the opening OP. ) extends to one side of the edge area to overlap one side of the first color filter CF1 , and is disposed in the n+1th pixel area to extend to the other side of the edge area of the opening OP to overlap the first color filter CF1 . A third color filter CF3 overlapping the other side of the color filter CF1 may be further included.

In addition, the overlapping area SP1 or SP2 of the first and second color filters CF1 and CF2 of the organic light emitting diode panel 116 according to the embodiment of the present invention has an inclined surface, and the organic light emitting layer OLE is the It may have an inclination corresponding to the inclined surface. In addition, the inclined surface may have an inclination in a direction corresponding to the inclination of the inner surface of the opening OP.

In addition, the organic light emitting layer OLE of the organic light emitting diode panel 116 according to an embodiment of the present invention includes an organic material emitting white light, and the first color filter CF1 is any one of red, green, and blue. It may include an organic material emitting light of one color.

In addition, the inclined surface is disposed between the anode electrode Ano and the first and second color filters CF1 and CF2 of the organic light emitting diode panel 116 according to the embodiment of the present invention to correspond to the overlapping area SP. It may further include an overcoat layer (OC) having

In addition, the organic light emitting diode display device according to the embodiment of the present invention includes a bank having a substrate SUB, an anode electrode Ano disposed on the substrate SUB, and an opening OP exposing the anode electrode Ano. A layer BANK, an organic light emitting layer OLE disposed in the opening OP, overlapping each other corresponding to an edge region of the opening OP, and disposed between the anode Ano and the substrate SUB An organic light emitting diode panel 116 including first and second color filters CF1 and CF2 and a cathode electrode layer Cat disposed in the opening OP, and the anode electrode Ano and the cathode electrode layer Cat The organic light emitting layer OLE may include a driving circuit 118 and 120 for applying an electric field therebetween, and the organic light emitting layer OLE may be a bottom emission type that emits light in the direction of the color filters CF1 and CF2 by the electric field.

In addition, the organic light emitting diode panel 116 according to the embodiment of the present invention is a substrate having n-1, n, and n+1-th pixel regions defined by one gate line G and a plurality of data lines D. preparing (SUB), forming a first color filter CF1 in the n-th pixel area, and overlapping one end of the first color filter CF1 to the n-1 th or n+1 th pixel forming a second color filter CF2 in the region and the n-th pixel region, forming an overcoat layer OC on the color filters CF1 and CF2, an anode electrode on the overcoat layer OC Forming (Ano), forming a bank layer (BANK) having an opening (OP) corresponding to the emission area (AA) of the n-th pixel area, and an organic light-emitting layer (BANK) in the opening (OP) by an inkjet method It can be manufactured by proceeding with the step of forming OLE). In this case, color filters for the same color may be formed at once through the same process.

In addition, when manufacturing the organic light emitting diode panel 116 according to the embodiment of the present invention, the overlapping area SP of the first and second color filters CF1 and CF2 may correspond to the edge area of the opening OP. . In addition, the organic light emitting layer OLE may be piled up on the inner surface of the opening OP. As such, the overlapping area SP is formed to be higher than the area where the color filter is alone, so that the thickness of the organic light emitting layer OLE according to the pile-up on the inner surface of the opening OP is increased. ) can be prevented from being thicker than the thickness of the organic light emitting layer (OLE) in the center.

Specifically, looking at the pixel structure with reference to FIGS. 6 and 7 , the organic light emitting diode pixel structure according to the first embodiment of the present invention includes a scan thin film transistor (hereinafter referred to as a "switch") (SW), a scan switch It may include a driving switch DR connected to SW, and an organic light emitting diode OLED connected to the driving switch DR.

The scan switch SW is formed at a portion where the gate line G and the data line D intersect. The scan switch SW serves to select a pixel. The scan switch SW includes a scanning gate electrode sGE branching from the gate line G, a scanning semiconductor layer sAL, a scanning source electrode sS, and a scanning drain electrode sD. can do.

In addition, the driving switch DR serves to drive the organic light emitting diode OLED of the pixel selected by the scan switch SW. The driving switch DR includes a driving gate electrode dG connected to the scan drain electrode sD of the scan switch SW, a driving semiconductor layer dAL, and a first driving power wiring supplying the first driving power. It may include a driving source electrode dS connected to VDD and a driving drain electrode dD. The driving drain electrode dD of the driving switch DR may be connected to the anode electrode Ano of the organic light emitting diode OLED.

Looking at the stacked structure, the glass or plastic substrate SUB has a plurality of pixel regions defined by gates and data lines G and D (n-1, n, n+1; n is a natural number). Each pixel area may include a non-emission area NA and an emission area AA. In addition, the substrate SUB may sequentially include an n-1 th pixel region, an n th pixel region, and an n+1 th pixel region along one gate line G.

Gate electrodes sGE and dGE of the scan switch SW and the driving switch DR may be formed on the substrate SUB on the first non-emission area NA1 of the n-th pixel area. In addition, the gate insulating layer GI covers the gate electrodes sGE and dGE. Semiconductor layers sAL and dAL may be formed on a portion of the gate insulating layer GI overlapping the gate electrodes sGE and dGE. On the semiconductor layers sAL and dAL, the source electrodes sS and dS and the drain electrodes sD and dD may be formed to face each other at predetermined intervals. The drain electrode sD of the scan switch SW may contact the driving gate electrode dGE of the driving switch DR through a contact hole formed in the gate insulating layer GI. In addition, a protective layer PAS covering the scan switch SW and the driving switch DR may be applied on the entire surface.

The semiconductor layers sAL and dAL may be formed by selecting an inorganic semiconductor or an organic semiconductor, and the inorganic semiconductor may include CdS, GaS, ZnS, CdSe, ZnSe, CdTe, SiC, and Si. In addition, the organic semiconductor forming the semiconductor layers (sAL, dAL) is a polymer, and includes polythiophene and its derivatives, polyparaphenylenevinylene and its derivatives, polyparaphenylene and its derivatives, polyfluorene and its derivatives. derivatives, polythiophenvinylene and derivatives thereof, polythiophene-heterocycloaromatic copolymers and derivatives thereof, as low molecular weight oligoacenes of pentacene, tetracene, and naphthalene and derivatives thereof, alpha-6 -thiophene, oligothiophene of alpha-5-theophene and derivatives thereof, phthalocyanine and derivatives thereof with or without metal, pyromellitic dianhydride or pyrolytic diimide and derivatives thereof , pyrylenetetrachirboxic acid dianhydride or pyrylenetetracarboxylic diimide and derivatives thereof.

Meanwhile, the first color filter CF1 may be applied to correspond to the emission area AA of the n-th pixel area. In this case, the first color filter CF1 may be disposed on the substrate SUB to have an area sufficient to overlap the entire anode electrode Ano to be formed later. In addition, the second color filter CF2 applied to the n−1th pixel area is extended to the nth pixel area, that is, extended to the first non-emission area NA1 of the nth pixel area, and more specifically, the nth color filter is applied. The coating may be extended to a boundary area between the first non-emission area NA1 and the light emission area AA of the pixel area.

Specifically, the second color filter CF2 applied to the n−1th pixel region extends to the nth pixel region, and the end region of the second color filter CF2 is formed between the first color filter CF1 and the nth pixel. It may overlap in a boundary area between the first non-emission area NA1 and the light emission area AA of the area. Accordingly, the first overlapping area SP1 of the first and second color filters CF1 and CF2 may rise upward. In other words, the first overlapping area SP1 may be formed to be higher than the surrounding area to have a step difference.

In addition, the third color filter CF3 applied to the n+1th pixel area extends to the emission area AA of the nth pixel area, so that the emission area AA of the nth pixel area and the third color filter CF3 of the n+1th pixel area are 2 The coating may be extended to the boundary area of the non-emission area NA2. Specifically, the third color filter CF3 applied to the n+1th pixel region extends to the nth pixel region, and the end region of the third color filter CF3 is formed between the first color filter CF1 and the nth pixel. It may overlap in a boundary area between the light emitting area AA and the second non-emission area NA2 of the area. Accordingly, the second overlapping area SP2 of the first and third color filters CF1 and CF3 may rise upward. In other words, the second overlapping area SP2 may be formed to be higher than the surrounding area to have a step difference.

Thereafter, an overcoat layer (OC) may be applied to the entire surface of the substrate for the purpose of leveling the surface of the substrate. The overcoat layer OC has a purpose of flattening the surface of the substrate, but corresponds to the step difference between the first and second overlapping areas SP1 and SP2 by the first and second overlapping areas SP1 and SP2. It can soar upwards.

Also, an anode electrode Ano of an organic light emitting diode OLED may be formed on the overcoat layer OC. The anode electrode Ano may be provided as a transparent electrode and a reflective electrode. When used as a transparent electrode, ITO, IZO, ZnO, or In2O3 may be provided. When used as a reflective electrode, Ag, Mg, Al , Pt, Pd, Au, Ni, Nd, Ir, Cr, and a compound thereof after forming a reflective film, ITO, IZO, ZnO, or In2O3 may be formed thereon.

Here, the anode electrode Ano may be connected to the drain electrode dD of the driving switch DR through the contact hole H formed in the overcoat layer OC, the second color filter CF2, and the passivation layer PAS. have.

The anode electrode Ano may have a shape that rises upward to correspond to the first and second overlapping regions SP1 and SP2.

In addition, on the substrate SUB on which the anode electrode Ano is formed, a scan switch SW, a driving switch DR, and various wirings D, S, and VDD are formed on the non-emission area NA to define a pixel area. A bank layer BANK that separates the light emitting area AA in which the organic light emitting diode OLED is formed may be formed. The bank layer BANK may determine an overlapping area of the organic light emitting layer OLE and the anode electrode Ano. Accordingly, the light emitting area AA may be determined by the bank layer BANK.

The anode electrode Ano may be exposed by the bank layer BANK. An organic light emitting layer OLE and a cathode electrode layer Cat may be sequentially stacked on the bank layer BANK and the anode electrode Ano. Accordingly, the organic light emitting diode OLED connected to the driving switch DR may be completed.

The organic light emitting layer OLE may be disposed using a printing technique such as ink-jet or nozzle printing. In the organic light emitting layer (OLE) patterning process using such a printing technology, a soluble material or a polymer-based liquid material is injected between the bank layers formed by the bank layers, and dried ( Dry) to form an organic light emitting layer (OLE).

FIG. 8 is an enlarged view of a dotted line portion of FIG. 7 .

Referring to FIG. 8 , the anode electrode Ano, the organic light emitting layer OLE and the cathode electrode layer Cat corresponding to the first overlapping region SP1 in which the first and second color filters CF1 and CF2 overlap each other are It may have an inclination while rising upward by the step formed by the first overlapping area SP1.

As described above, when the color filter CF is applied to supplement color characteristics, an inclination may occur in the overcoat layer OC on the first and second color filters CF1 and CF2. Using this phenomenon, if the amount of rising of the upper overcoat layer (OC) is controlled and the application amount of the pile-up and the overcoat layer (OC) is matched, an ink film of the same thickness can be made. have. That is, by matching the extent to which the organic light emitting layer (OEL) rises due to the pile-up phenomenon and the extent to which the overcoat layer (OC) rises according to the first overlapping area SP1, the thickness of the ink film is adjusted before the pixel area. The same can be done over the range. Accordingly, not only the thickness h1 of the cathode electrode layer Cat but also the thickness h2 of the organic light emitting layer OLE may be uniformly formed over the entire region.

Although the existing pile-up bank layer (BANK) and the end area, that is, the area where pile-up occurs, were not used as the light emitting area, an effective light emitting area was formed by forming an organic light emitting layer (OLE) of the same thickness. can increase

In addition, since the bank layer BANK is not additionally required, the number of processes is reduced, and the cost is reduced by reducing the mask. That is, when the color filter in the pixel area adjacent to the corresponding pixel is formed, it can be extended to the corresponding pixel and overlapped with the color filter of the corresponding pixel, so that an additional process is not required, thereby reducing manufacturing time and manufacturing cost while reducing manufacturing time and manufacturing cost. area can be increased.

Also, on the other hand, the thickness of the color filter can be adjusted through the inkjet method, but considering that there is a process limitation in printing the color filter while adjusting the thickness by the inkjet method as the resolution of the display panel increases, there is no additional photo process required. The first color filter CF1 of the n-th pixel area is first formed, the second color filter CF2 of the n-1 th pixel area is formed, and then the third color filter CF3 of the n+1-th pixel area is formed. ) can be formed. In this case, when the second color filter CF2 is formed, the second color filter CF2 is further extended to the n-th pixel area to overlap one end of the first color filter CF1 in the n-th pixel area, and the third color filter CF3 is formed. When forming , it extends to the n-th pixel area and overlaps the other end of the first color filter CF1 in the n-th pixel area to correspond to the pile-up of the organic light emitting layer OLE, the overlapped color Since the filters are stacked thicker, the thickness of the organic light emitting layer OLE may be uniform.

The principle of making the thickness of the organic light emitting layer OLE uniform can be explained in the same way in the second overlapping region SP2, and the effect thereof is the same, and is equally applied to all pixel regions on the substrate SUB. can do.

9 is an equivalent circuit showing the structure of an OLED pixel according to the second embodiment, and FIG. 10 is a diagram showing the structure of an OLED pixel of a bottom emission type cut along the perforated line C-D.

The structure of the organic light emitting diode display device according to the second embodiment of the present invention is basically the same as that of the first embodiment. If there is a difference, in order to reduce the number of first driving power wirings VDD, one of the first driving power wirings VDD is connected to all of the neighboring anode electrodes Ano1 and Ano2 allocated to pixels on both left and right sides. There is a difference in

Specifically, two pixel columns adjacent to each other share the first driving power supply line VDD disposed in the middle. That is, it has a structure in which left and right sides are symmetric with respect to the first driving power wiring VDD.

In the second embodiment, similarly to the first embodiment, one end of the second color filter CF2 extending from the n-1 th pixel region and the first color filter CF1 of the n th pixel region overlap each other. The other end of the third color filter CF3 extending from the area SP1 and the n+1th pixel area and the first color filter CF1 of the nth pixel area is in the second overlapping area SP2 overlapping each other. Accordingly, the first and second organic light emitting layers OLE1 and OLE2 rise upward in response to pile-up to have an inclined region, and accordingly, the first and second organic light emitting layers OLE1 and OLE2 . Each thickness can be made uniform.

11 is a comparative example showing the boundary between the light emitting region and the non-emissive region when the color filter overlap is not used, and FIG. 12 is an experimental example showing the boundary between the light emitting region and the non-emissive region when the color filter overlap is used.

Referring to FIG. 12 to which the embodiment of the present invention is applied compared to the comparative example of FIG. 11 , it can be seen that the overlapping area is inclined according to the overlapping of the color filters CF. Therefore, when the overcoat layer (OC) is deposited on the overlapping area, if the profile of the overcoat layer (OC) and the degree of pile-up are identical, the thickness of the ink film forming the organic light emitting layer (OLE) is constant. can

That is, as the boundary area between the pixel and the opening OP of the bank layer BANK, which was not used due to the pile-up phenomenon, can be used as the light emitting area, the effective light emitting area increases and the aperture ratio increases. Increasing the aperture ratio improves the efficiency and lifespan of an organic light emitting diode (OLED). In addition, since the existing two-tier bank (BANK) method is not used, the process efficiency increases and the cost decreases as the use of a mask is reduced once.

In the detailed description of the present invention described above, although it has been described with reference to preferred embodiments of the present invention, those skilled in the art or those having ordinary knowledge in the art will It will be understood that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

116 organic light emitting diode panel
118 gate drive circuit
120 data drive circuit
122 pixels, sub pixels
124 timing controller
SUB board
NA non-emission area
AA emission area
CF color filter
SP overlap area
OLED organic light emitting diode
Ano anode electrode
Cat cathode electrode layer
OLE organic light emitting layer
BANK bank floor
OP opening
SW scan switch
Source electrode for sS scan
Drain electrode for sD scan
Gate electrode for sGE scan
semiconductor layer for sAL scan
DR drive switch
Source electrode for dS drive
Drain electrode for dD driving
Gate electrode for dGE driving
semiconductor layer for driving dAL

Claims (11)

Board;
a gate line and a data line disposed on the substrate to define n−1, n, and n+1th pixel regions;
an anode electrode disposed on the substrate;
a bank layer having an opening for exposing the anode electrode corresponding to the light emitting region;
an organic light emitting layer disposed in the opening; and
each of the n-th pixel region and the n-1 th or n+1 th pixel region including the emission region, overlapping each other corresponding to the edge region of the opening, and disposed between the anode electrode and the substrate Including first and second color filters,
An organic light emitting diode panel having an inner surface of the opening inclined by the overlapping first and second color filters. delete According to claim 1,
when the second color filter is disposed in the n-1 th pixel area, the second color filter extends to one side of the edge area of the opening and overlaps with one side of the first color filter;
and a third color filter disposed in the n+1th pixel area and extending to the other side of the edge area of the opening to overlap the other side of the first color filter. According to claim 1,
The overlapping area of the first and second color filters has an inclined surface,
The organic light emitting layer has a slope corresponding to the slope,
The inclined surface is inclined in a direction corresponding to the inclination of the inner surface of the opening. According to claim 1,
The organic light emitting diode panel further comprising an overcoat layer disposed between the anode electrode and the first and second color filters and having an inclined surface corresponding to the overlapping region. Board; a gate line and a data line disposed on the substrate to define n−1, n, and n+1th pixel regions; an anode electrode disposed on the substrate; a bank layer having an opening for exposing the anode electrode corresponding to the light emitting region; an organic light emitting layer disposed in the opening; each of the n-th pixel region and the n-1 th or n+1 th pixel region including the emission region, overlapping each other corresponding to an edge region of the opening, and disposed between the anode electrode and the substrate first and second color filters; and a cathode electrode layer disposed in the opening, wherein an inner surface of the opening is inclined by the overlapping first and second color filters and an electric field between the anode and the cathode is applied. and a driving circuit, wherein the organic light emitting layer emits light in the direction of the color filter by the electric field. delete 7. The method of claim 6,
when the second color filter is disposed in the n-1 th pixel area, the second color filter extends to one side of the edge area of the opening and overlaps with one side of the first color filter;
and a third color filter disposed in the n+1th pixel area, extending to the other side of the edge area of the opening, and overlapping the other side of the first color filter. 7. The method of claim 6,
The overlapping area of the first and second color filters has an inclined surface,
The organic light emitting layer has a slope corresponding to the slope,
The inclined surface is inclined in a direction corresponding to the inclination of the inner surface of the opening. 7. The method of claim 6,
The organic light emitting layer includes an organic material emitting white light,
The first color filter is an organic light emitting diode display including an organic material emitting any one of red, green, and blue color. delete

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