KR102587398B1 - Organic light emitting display device - Google Patents

Abstract

The present invention discloses an organic light emitting display device. The organic light emitting display device of the present invention includes a substrate divided into a plurality of sub-pixels, an organic light emitting element that emits first light and includes a first electrode, an organic light emitting layer, and a second electrode, and the above. It is disposed overlapping with the first electrode in an area corresponding to at least one light-emitting area of the plurality of sub-pixels and includes a wavelength conversion layer that converts the first light into any one of second light to fourth light.

Description

Organic light emitting display device {ORGANIC LIGHT EMITTING DISPLAY DEVICE}

The present invention relates to an organic light emitting display device, and more specifically, to an organic light emitting display device that can simplify processes and prevent color mixing between subpixels.

As the information society develops, the demand for display devices for displaying images is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panel devices (PDPs), Various flat panel display devices such as organic light emitting diode display devices (OLED) are being used.

Among such display devices, organic light emitting display devices use self-luminous elements, so they do not require the backlight used in liquid crystal displays using non-light emitting elements, so they can be lightweight and thin. In addition, organic light emitting display devices have superior viewing angles and contrast ratios compared to liquid crystal displays, and are also advantageous in terms of power consumption. In addition, organic light emitting display devices are capable of driving at low direct current voltages, have a fast response speed, are resistant to external shocks because their internal components are solid, have a wide operating temperature range, and have the advantage of being particularly inexpensive in terms of manufacturing costs.

Such an organic light emitting display device displays images in a top emission method or a bottom emission method depending on the structure of the organic light emitting element including a first electrode, a second electrode, and an organic light emitting layer. The bottom emission method displays visible light generated from the organic emission layer toward the bottom of the substrate on which the TFT is formed, while the top emission method displays visible light generated from the organic emission layer toward the top of the substrate on which the TFT is formed.

Meanwhile, in such organic light emitting display devices, organic light emitting layers are formed for each sub-pixel that emits different colors, so the process is complicated. Additionally, when stacking an organic light emitting layer, there is a problem in that color mixing between sub-pixels occurs due to misalignment.

Accordingly, there is a demand for an organic light emitting display device that can solve these problems.

The present invention is intended to solve the above problems and to provide an organic light emitting display device that can simplify the process and prevent color mixing between sub-pixels.

The organic light emitting display device of the present invention to solve the problems of the prior art as described above includes a substrate divided into a plurality of sub-pixels, an organic light emitting element that emits first light and includes a first electrode, an organic light emitting layer, and a second electrode. and a wavelength conversion layer disposed overlapping with the first electrode in a region corresponding to at least one light-emitting region of the plurality of sub-pixels and converting the first light into any one of second light to fourth light.

Meanwhile, in an organic light emitting display device, one pixel is composed of 2 to 4 subpixels, the wavelength conversion layer is disposed in at least one subpixel among the 2 to 4 subpixels, and the wavelength conversion layer is disposed in at least one subpixel among the 2 to 4 subpixels. The sub-pixel is provided with an area where at least one wavelength conversion layer is not disposed. Here, the area where the wavelength conversion layer is not disposed may be included in a sub-pixel that emits blue light.

The wavelength conversion layer includes quantum dots and may optionally include a conductive material, and the quantum dots may be quantum dots that convert first light into any one of second light to fourth light.

Additionally, the organic light emitting display device may further include a light blocking layer disposed in an area corresponding to the bank pattern in the area corresponding to the non-emission area.

Additionally, the organic light emitting display device may further include a band pass filter that is disposed to overlap the wavelength conversion layer in at least one light emitting area and blocks the first light.

The organic light emitting display device according to the present invention includes an organic light emitting layer that emits light of the same color in each light emitting region and a wavelength conversion layer in at least one light emitting region, so that the process of forming the organic light emitting layer can be simplified. It has the effect of reducing material costs.

In addition, the organic light emitting display device according to the present invention has a band pass filter disposed on at least one wavelength conversion layer, so that unnecessary first light is blocked in at least one light emitting area, thereby improving the color reproduction rate of the organic light emitting display device. It works.

In addition, the organic light emitting display device according to the present invention has the effect of preventing the light passing through the wavelength conversion layer from mixing with each other by disposing a light blocking layer adjacent to at least one wavelength conversion layer in the non-emission area.

1 is a diagram briefly showing a display device according to embodiments.
Figure 2 is a plan view of an organic light emitting display device according to embodiments of the present invention.
Figure 3 is a cross-sectional view of an organic light emitting display device according to a first embodiment of the present invention.
Figure 4 is a diagram showing the size of quantum dots included in the wavelength conversion layer disposed in each light-emitting region.
Figure 5 is a cross-sectional view of an organic light emitting display device according to a second embodiment of the present invention.
Figure 6 is a cross-sectional view of an organic light emitting display device according to a third embodiment of the present invention.
Figure 7 is a cross-sectional view of an organic light emitting display device according to a fourth embodiment of the present invention.
Figure 8 is a cross-sectional view of an organic light emitting display device according to a fifth embodiment of the present invention.
Figure 9 is a cross-sectional view of an organic light emitting display device according to a sixth embodiment of the present invention.
Figure 10 is a cross-sectional view of an organic light emitting display device according to a seventh embodiment of the present invention.
Figure 11 is a cross-sectional view of an organic light emitting display device according to an eighth embodiment of the present invention.
Figure 12 is a cross-sectional view of an organic light emitting display device according to a ninth embodiment of the present invention.
Figure 13 is a cross-sectional view of an organic light emitting display device according to an 11th embodiment of the present invention.
Figure 14 is a plan view of an organic light emitting display device according to another embodiment of the present invention.
Figure 15 is a cross-sectional view of an organic light emitting display device according to an 11th embodiment of the present invention.
Figure 16 is a cross-sectional view of an organic light emitting display device according to a twelfth embodiment of the present invention.
Figure 17 is a cross-sectional view of an organic light emitting display device according to a 13th embodiment of the present invention.

Hereinafter, embodiments 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 idea 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 numerals refer to like elements throughout the specification.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms, but the present embodiments only serve to complete the disclosure of the present invention and are within the scope of common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have 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 specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of explanation.

When an element or layer is referred to as another element or “on” or “on” it includes not only those directly on top of another element or layer, but also all cases where there is another layer or element in between. do. On the other hand, referring to an element as “directly on” or “directly on” indicates that there is no intervening element or layer.

Spatially relative terms such as “below, beneath,” “lower,” “above,” and “upper” refer to one element or component as shown in the drawing. It can be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood as terms that include different directions of the element during use or operation in addition to the direction shown in the drawings. For example, if an element shown in the drawings is turned over, an element described as “below” or “beneath” another element may be placed “above” the other element. Accordingly, the illustrative term “down” can include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments and is therefore not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context. As used in the specification, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements. or does not rule out addition.

1 is a diagram briefly showing a display device according to embodiments. Referring to FIG. 1, the display device 1000 according to embodiments has a plurality of first lines (VL1 to VLm) formed in a first vertical direction and a plurality of second lines in a second horizontal direction. A display panel 1110 in which (HL1 to HLn) is formed, a first driver 1200 that supplies a first signal to a plurality of first lines (VL1 to VLm), and a plurality of second lines (HL1 to HLn). It includes a second driver 1300 that supplies two signals, and a timing controller 1400 that controls the first driver 1200 and the second driver 1300.

The display panel 1110 includes a plurality of pixels (P: Pixel) is defined.

Each of the above-described first driver 1200 and second driver 1300 may include at least one driver integrated circuit (Driver IC) that outputs a signal for image display.

For example, the plurality of first lines (VL1 to VLm) formed in the first direction on the display panel 1110 may be data lines that are formed in the vertical direction and transmit data voltage (first signal) to the pixel column in the vertical direction. The first driver 1200 may be a data driver that supplies data voltage to the data line.

In addition, the plurality of second lines HL1 to HLn formed in the second direction on the display panel 1110 may be gate wires formed in the horizontal direction to transmit a scan signal (first signal) to the pixel column in the horizontal direction. 2 The driver 1300 may be a gate driver that supplies a scan signal to the gate wiring.

Additionally, a pad portion is formed on the display panel 1110 to connect the first driver 1200 and the second driver 1300. When the first signal is supplied from the first driver 1200 to the plurality of first lines (VL1 to VLm), the pad unit transmits it to the display panel 1110, and similarly, the second driver 1300 supplies the first signal to the plurality of second lines (VL1 to VLm). When the second signal is supplied to HL1 to HLn), it is transmitted to the display panel 1110.

Each pixel includes one or more subpixels. The sub-pixel refers to a unit in which a specific type of color filter is formed or an organic light-emitting device can emit a specific color without forming a color filter. Colors defined in sub-pixels may include red (R), green (G), blue (B), and optionally white (W), but the present invention is not limited thereto. Since each sub-pixel includes a separate thin film transistor and an electrode connected thereto, hereinafter, the sub-pixels constituting the pixel are also referred to as one pixel area. A first line may be arranged for each subpixel, and multiple subpixels constituting a pixel may share a specific first line. The configuration of the pixel/sub-pixel and the first line/second line may be implemented in various ways, and the present invention is not limited thereto.

The electrode connected to the thin film transistor that controls the light emission of each pixel area of the display panel 1110 is referred to as the first electrode, and the electrode disposed on the front surface of the display panel or disposed to include two or more pixel areas is referred to as the second electrode. . When the first electrode is an anode electrode, the second electrode becomes a cathode electrode, and vice versa. Hereinafter, the anode electrode will be described as an example of the first electrode, and the cathode electrode will be described as an example of the second electrode, but the present invention is not limited thereto.

Additionally, organic light emitting display devices can be classified into top emission, bottom emission, or dual emission types depending on the structure of the organic light emitting device. In the embodiments described later, the description will focus on the organic light emitting display device for the top emission method, but the present invention is not limited thereto.

Next, an organic light emitting display device according to embodiments of the present invention will be reviewed with reference to FIG. 2 as follows. Figure 2 is a plan view of an organic light emitting display device according to embodiments of the present invention.

Referring to FIG. 2, in the organic light emitting display device according to the present invention, subpixels SP1, SP2, SP3, and SP4 are disposed in areas where the gate wire 10 and the data wire 20 intersect. Here, the subpixel is composed of a first subpixel (SP1), a second subpixel (SP2), a third subpixel (SP3), and a fourth subpixel (SP4).

At this time, the first subpixel (SP1) is a red® subpixel, the second subpixel (SP2) is a green (G) subpixel, the third subpixel (SP3) is a blue (B) subpixel, and the third subpixel (SP3) is a blue (B) subpixel. Subpixel 4 (SP4) may be a white (W) subpixel.

Meanwhile, in Figure 2, one pixel (P) is shown to be composed of four sub-pixels (SP1, SP2, SP3, SP4), but the present invention is not limited to this, and one pixel (P) consists of two to four sub-pixels (SP1, SP2, SP3, and SP4). It may be composed of three sub-pixels. However, in the embodiments described later, the description will focus on embodiments in which one pixel P includes four sub-pixels SP1, SP2, SP3, and SP4.

A driver including a thin film transistor is disposed in each sub-pixel (SP1, SP2, SP3, and SP4), and a display portion including a light-emitting area is disposed above the driver. The thin film transistor includes a gate electrode 101, an active layer 103, a source electrode 104, and a drain electrode 105.

Additionally, the first electrode 130 of the organic light emitting device is disposed, which is connected to the drain electrode 105 of the thin film transistor. Additionally, a bank pattern 140 is disposed on a portion of the upper surface of the first electrode 130. The area where the bank pattern 140 is arranged may be a non-emission area, and the area where the bank pattern 140 is not arranged may be a non-emission area.

And, the first sub-pixel (SP1), the second sub-pixel (SP2), and the fourth sub-pixel (SP4) include the first wavelength conversion layer 170, the second wavelength conversion layer 171, and the third wavelength conversion layer, respectively. Includes (172). In detail, the first wavelength conversion layer 170, the second wavelength conversion layer 171, and the third wavelength conversion layer 172 may each be disposed on the first electrode 130 of the organic light emitting device.

This configuration will be examined in detail with reference to FIG. 3 as follows. Figure 3 is a cross-sectional view of an organic light emitting display device according to a first embodiment of the present invention. Referring to FIG. 3, the organic light emitting display device according to the first embodiment of the present invention includes a plurality of subpixels.

In Figure 3, the first sub-pixel includes the first emission area (EA1), the second sub-pixel includes the second emission area (EA2), and the third sub-pixel includes the third emission area (EA3). , the fourth sub-pixel starts to include the fourth light-emitting area (EA4).

Each of the light emitting areas EA1, EA2, EA3, and EA4 may be driven by a driving thin film transistor (not shown) disposed on the substrate 100. An insulating layer 110 is disposed on the substrate 100 including a driving transistor (not shown).

Although FIG. 3 shows a configuration in which a single-layer insulating layer 110 is disposed on the substrate 100, the organic light emitting display device according to the first embodiment of the present invention is not limited to this, and the substrate 100 Multiple layers of insulating layers may be disposed on the top.

A first electrode 130 of an organic light emitting element (EL) is disposed on the insulating layer 100 for each sub-pixel. Although FIG. 3 shows a configuration in which the first electrode 130 is composed of a single layer, the organic light emitting display device according to the first embodiment of the present invention is not limited to this, and the first electrode 130 is composed of multiple layers. It could be. At this time, the first electrode 130 may include a reflective layer. Through this, a top-emitting organic light emitting display device can be implemented.

A bank pattern 140 is disposed in contact with a portion of the upper surface of the first electrode 130. The bank pattern 140 defines an emission area (EA1, EA2, EA3, EA4) and a non-emission area (NEA) of each subpixel. Additionally, the bank pattern 140 according to the first embodiment of the present invention may be made of an opaque organic material. For example, the bank pattern 140 may be a black bank pattern.

The organic light emitting layer 150 of the organic light emitting device (EL) is disposed on the first electrode 130 and the bank pattern 140. The second electrode 160 of the organic light emitting element (EL) is disposed on the organic light emitting layer 150. The organic light emitting device (EL) may emit first light. At this time, the first light may be blue light. For example, the first light may have a spectrum with maximum intensity at 450 nm to 460 nm.

Meanwhile, it is disposed overlapping with the first electrode 130 in an area corresponding to at least one light-emitting area (EA1, EA2, EA3, EA4) of a plurality of sub-pixels, and transmits the first light into one of the second to fourth lights. It includes wavelength conversion layers (170, 171, 172) that convert to either one. Specifically, the first wavelength conversion layer 170 is disposed in the area corresponding to the first emission area (EA1), and the second wavelength conversion layer 171 is disposed in the area corresponding to the second emission area (EA2). And the third wavelength conversion layer 172 is disposed in the area corresponding to the fourth light-emitting area EA4.

At this time, the first to third wavelength conversion layers 170, 171, and 172 may be disposed between the organic light-emitting layer 150 and the second electrode 160 in each light-emitting region. Additionally, the first to third wavelength conversion layers 170, 171, and 172 may each include quantum dots and optionally a conductive material. Here, the conductive material ensures smooth electrical connection between the first electrode 10 and the second electrode 160.

The quantum dots included in the first to third wavelength conversion layers 170, 171, and 172 convert the wavelength of light to emit specific desired light, and the wavelength that can be converted varies depending on the size of the particle. Therefore, by adjusting the size of the quantum dots, it is possible to emit light of a desired color.

Quantum dots can be made of any material selected from CdSe, ZnSe, ZnO, ZnTe, InP, GaP, InGaN, and InN, and the size of the quantum dots can be adjusted as needed in the range of 2 nm to 10 nm. However, the material and diameter of quantum dots according to embodiments of the present invention are not limited thereto.

As the size of such quantum dots decreases, the wavelength of the emitted light becomes shorter, generating blue light, and as the size of the quantum dot increases, the wavelength of the emitted light becomes longer, generating red light. Additionally, quantum dots may be formed in a dual structure consisting of an inner core and an outer shell surrounding the inner core.

Meanwhile, as shown in FIG. 4, quantum dots of different sizes may be included in each of the wavelength conversion layers 170, 171, and 172 disposed in each light-emitting region. Figure 4 is a diagram showing the size of quantum dots included in the wavelength conversion layer disposed in each light-emitting region.

Referring to FIG. 4, the size of the quantum dots 170a included in the first wavelength conversion layer 170 disposed in the first emission region is the size of the quantum dots included in the second wavelength conversion layer 171 disposed in the second emission region. It can be made larger than the size of (171a). In addition, the size of the quantum dots 171a included in the second wavelength conversion layer 171 disposed in the second light-emitting region is that of the quantum dots 172a included in the third wavelength conversion layer 172 disposed in the fourth light-emitting region. It can be made larger than the size.

Therefore, the wavelength of light passing through the first wavelength conversion layer 170 is longer than the wavelength of light passing through the second wavelength conversion layer 171, and the wavelength of light passing through the second wavelength conversion layer 171 is longer than the wavelength of light passing through the second wavelength conversion layer 171. It can be longer than the wavelength of light that has passed through (172).

In FIG. 3 , the first wavelength conversion layer 170 disposed in an area corresponding to the first emission area EA1 can convert the first light emitted from the organic emission layer 150 into second light. At this time, the second light may be red light. For example, the second light may have a spectrum with a maximum intensity at 630 nm to 640 nm.

In detail, part of the first light emitted from the organic emission layer 150 in the first emission area EA1 propagates in the direction toward the first wavelength conversion layer 170, and the remaining portion propagates in the direction of the first electrode 130. You can. At this time, the first light traveling in the direction of the first wavelength conversion layer 170 is converted into second light while passing through the first wavelength conversion layer 170. Then, the first light traveling in the direction of the first electrode 130 is reflected by a reflection layer (not shown), passes through the first wavelength conversion layer 170, and is finally converted into second light, exiting the display device. It can be.

Additionally, the second wavelength conversion layer 171 disposed in an area corresponding to the second emission area EA2 can convert the first light emitted from the organic emission layer 150 into third light. At this time, the third light may be green light. For example, the third light may have a spectrum with a maximum intensity between 520 nm and 560 nm.

In detail, part of the first light emitted from the organic light-emitting layer 150 in the second light-emitting area EA2 propagates toward the second wavelength conversion layer 171, and the remaining portion propagates toward the first electrode 130. You can. At this time, the first light traveling in the direction of the second wavelength conversion layer 171 is converted into third light while passing through the second wavelength conversion layer 171. Then, the first light traveling in the direction of the first electrode 130 is reflected by a reflection layer (not shown), passes through the second wavelength conversion layer 171, and is finally converted into third light, exiting the display device. It can be.

Additionally, the third wavelength conversion layer 172 disposed in an area corresponding to the fourth emission area EA4 can convert the first light emitted from the organic emission layer 150 into fourth light. At this time, the fourth light may be white light. For example, the fourth light may be white light with high spectral intensity in the wavelength range of 450 nm to 460 nm and the wavelength range of 540 nm to 560 nm.

In detail, part of the first light emitted from the organic light-emitting layer 150 in the fourth light-emitting area EA4 propagates toward the third wavelength conversion layer 172, and the remaining portion propagates toward the first electrode 130. You can. At this time, the first light traveling in the direction of the third wavelength conversion layer 172 is converted into fourth light while passing through the third wavelength conversion layer 172. Then, the first light traveling in the direction of the first electrode 130 is reflected by a reflection layer (not shown), passes through the third wavelength conversion layer 172, and is finally converted into fourth light, exiting the display device. It can be.

In particular, the third wavelength conversion layer 172 converts a portion of blue (B) light into yellow (Y) or yellow green (YG) light, thereby emitting white light from the fourth emission area EA4.

Meanwhile, the wavelength conversion layer may not be disposed in the third emission area EA3. Accordingly, in the third emission area EA3, the first light emitted from the organic emission layer 150 may be emitted as is to the outside of the display device. That is, the first light having a spectrum with a maximum intensity in the range of 450 nm to 460 nm may be emitted from the third emission area EA3.

That is, a first wavelength conversion layer 170, a second wavelength conversion layer 171, and a third wavelength conversion layer in the first emission area (EA1), the second emission area (EA2), and the fourth emission area (EA4), respectively. By disposing 172, the first light emitted from the organic light emitting layer 150 can be converted into second light, third light, and fourth light, respectively. Additionally, since the wavelength conversion layer is not disposed in the third emission area EA3, the first light emitted from the organic emission layer 150 can be emitted as is.

In other words, the second light is emitted from the first emission area EA1, the third light is emitted from the second emission area EA2, the first light is emitted from the third emission area EA3, and the third light is emitted from the third emission area EA3. Fourth light may be emitted from the light emitting area EA4. In this way, by providing the organic light-emitting layer 150 that emits light of the same color in each light-emitting area, the process of forming the organic light-emitting layer 150 can be simplified and material costs can be reduced.

In addition, by emitting the first light having a high spectrum intensity at 450 nm to 460 nm through the organic light emitting layer 150, the wavelength range is higher than that of the first light through the first to third wavelength conversion layers 170, 171, and 172. It can be smoothly switched to the second to fourth lights with high light. In other words, since the organic light emitting layer 150 emits first light with high energy, it can be easily converted to light with lower energy than the first light through the first to third wavelength conversion layers (170, 171, 172). .

In addition, first to third wavelength conversion layers ( By arranging 170, 171, 172), unnecessary first light in the first emission area (EA1), second emission area (EA2), and fourth emission area (EA4) is converted into second light, third light, and fourth light, respectively. By converting it into light, the efficiency of the panel can be improved.

Meanwhile, an encapsulation layer 190 that protects the organic light emitting device EL from moisture and oxygen is disposed on the second electrode 160 of the organic light emitting device EL. A barrier layer 200, a polarizer 201, an adhesive layer 202, and a touch panel unit 203 may be sequentially stacked on the encapsulation layer 190, but the organic light emitting display according to the first embodiment of the present invention The device is not limited to this, and may have a structure in which the touch panel unit 203 is omitted.

Next, looking at the organic light emitting display device according to the second embodiment of the present invention, as follows. Figure 5 is a cross-sectional view of an organic light emitting display device according to a second embodiment of the present invention. The organic light emitting display device according to the second embodiment of the present invention may include the same components as the previously described embodiment. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

Referring to FIG. 5 , compared to FIG. 3 , the organic light emitting display device according to the second embodiment of the present invention may further include a first light blocking layer 300 disposed to overlap the bank pattern 140. . Specifically, the first light blocking layer 300 may be disposed between the organic light emitting layer 150 and the second electrode 160 in the non-emissive area (NEA) within the display area of the organic light emitting display device.

At this time, the first light blocking layer 300 may be disposed adjacent to at least one wavelength conversion layer (170, 171, 172). Here, the first light blocking layer 300 may be made of an opaque organic material.

In this way, the first light blocking layer 300 is disposed adjacent to at least one wavelength conversion layer (170, 171, 172) in the non-emission area (NEA), thereby allowing light passing through the wavelength conversion layers (170, 171, 172) It has the effect of preventing light from mixing with each other.

Additionally, the structure of the organic light emitting display device according to the present invention is not limited to this, and may have a structure as shown in FIG. 6. Figure 6 is a cross-sectional view of an organic light emitting display device according to a third embodiment of the present invention. The organic light emitting display device according to the third embodiment of the present invention may include the same components as the previously described embodiments. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

Referring to FIG. 6, the organic light emitting display device according to the third embodiment of the present invention is an organic light emitting device including a first electrode 130, an organic light emitting layer 150, and a second electrode 160 in each subpixel. (EL) is placed. Additionally, wavelength conversion layers 270, 271, and 272 may be disposed in at least one light emitting area (EA1, EA2, EA3, and EA4) on the second electrode 160.

In detail, the first wavelength conversion layer 270 is disposed in an area corresponding to the first emission area (EA1), and the second wavelength conversion layer 271 is disposed in an area corresponding to the second emission area (EA2). , the third wavelength conversion layer 272 is disposed in an area corresponding to the fourth light-emitting area EA4. Here, the first wavelength conversion layer 270, the second wavelength conversion layer 271, and the third wavelength conversion layer 272 are between the second electrode 160 and the encapsulation layer 290 of the organic light emitting device (EL). can be placed in

Meanwhile, the encapsulation layer 190 may be made of an inorganic film such as SiNx or SiO2, but the present invention is not limited thereto and may be made of an organic film. In addition, although FIG. 6 shows a configuration in which the encapsulation layer 290 is a single layer, the present invention is not limited to this and may be composed of multiple layers.

The first wavelength conversion layer 270, the second wavelength conversion layer 271, and the third wavelength conversion layer 272 have a first emission area (EA1), a second emission area (EA2), and a fourth emission area (EA1), respectively. By being disposed between the second electrode 160 and the encapsulation layer 290 in EA4), the first light emitted from the organic light-emitting element EL becomes second light in the first light-emitting area EA1 and is converted into second light in the second light-emitting area EA1. It can be switched to third light in EA2 and to fourth light in fourth light emitting area EA4.

Through this, even though one pixel shares the organic light-emitting layer 150 that emits the same light, red (R) light, green (R) light, blue (B) light, and white (W) light are emitted from one pixel. can all emit light.

In addition, color mixing in the organic light emitting display device can be prevented through the structure shown in FIG. 7. Figure 7 is a cross-sectional view of an organic light emitting display device according to a fourth embodiment of the present invention. The organic light emitting display device according to the fourth embodiment of the present invention may include the same components as the previously described embodiments. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

Referring to FIG. 7, the organic light emitting display device according to the fourth embodiment of the present invention further includes a second light blocking layer 310 disposed to overlap the bank pattern 140 in the organic light emitting display device shown in FIG. 6. do.

At this time, the second light blocking layer 310 may be disposed between the second electrode 160 and the encapsulation layer 290 in the non-emissive area (NEA) within the display area of the organic light emitting display device. The second light blocking layer 310 can prevent color mixing of light of different wavelengths passing through the first wavelength conversion layer 270, the second wavelength conversion layer 271, and the third wavelength conversion layer 271.

Next, with reference to FIG. 8, an organic light emitting display device according to a fifth embodiment of the present invention will be examined as follows. Figure 8 is a cross-sectional view of an organic light emitting display device according to a fifth embodiment of the present invention. The organic light emitting display device according to the fifth embodiment of the present invention may include the same components as the previously described embodiments. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

Referring to FIG. 8, the organic light emitting display device according to the fifth embodiment of the present invention is an organic light emitting device including a first electrode 130, an organic light emitting layer 150, and a second electrode 160 in each subpixel. (EL) is placed. In addition, wavelength conversion layers 370, 371, and 372 may be disposed in at least one light emitting area (EA1, EA2, EA3, and EA4) on the second electrode 160.

In detail, the first wavelength conversion layer 370 is disposed in an area corresponding to the first emission area (EA1), and the second wavelength conversion layer 371 is disposed in an area corresponding to the second emission area (EA2). , the third wavelength conversion layer 372 is disposed in an area corresponding to the fourth light-emitting area EA4. Here, the first wavelength conversion layer 370, the second wavelength conversion layer 371, and the third wavelength conversion layer 372 may be disposed between the encapsulation layer 190 and the barrier layer 200.

Meanwhile, the barrier layer 200 may be made of an inorganic film or an organic film, and may be in the form of a film. In addition, although FIG. 8 shows a configuration in which the barrier layer 200 is a single layer, the fifth embodiment of the present invention is not limited to this, and the barrier layer 200 may be composed of multiple layers.

The first wavelength conversion layer 370, the second wavelength conversion layer 371, and the third wavelength conversion layer 372 have a first emission area (EA1), a second emission area (EA2), and a fourth emission area (EA1), respectively. By being disposed between the encapsulation layer 190 and the barrier layer 200 in EA4), the first light emitted from the organic light emitting element EL is converted into second light in the first light emitting area EA1, and is converted into second light in the second light emitting area EA1. It can be switched to the third light in EA2) and to the fourth light in the fourth light emitting area (EA4).

Additionally, color mixing in the organic light emitting display device can be prevented through the structure shown in FIG. 9. Figure 9 is a cross-sectional view of an organic light emitting display device according to a sixth embodiment of the present invention. The organic light emitting display device according to the sixth embodiment of the present invention may include the same components as the previously described embodiments. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

Referring to FIG. 9, the organic light emitting display device according to the sixth embodiment of the present invention further includes a third light blocking layer 410 disposed to overlap the bank pattern 140 in the organic light emitting display device shown in FIG. 9. do.

At this time, the third light blocking layer 410 may be disposed between the encapsulation layer 190 and the barrier layer 200 in the non-emissive area (NEA) within the display area of the organic light emitting display device. In addition, the third light blocking layer 410 may be disposed adjacent to at least one wavelength conversion layer among the first wavelength conversion layer 370, the second wavelength conversion layer 371, and the third wavelength conversion layer 372. there is.

The third light blocking layer 410 can prevent color mixing of light of different wavelengths passing through the first wavelength conversion layer 370, the second wavelength conversion layer 371, and the third wavelength conversion layer 371.

Next, the organic light emitting display device according to the seventh embodiment of the present invention will be examined with reference to FIG. 10 as follows. Figure 10 is a cross-sectional view of an organic light emitting display device according to a seventh embodiment of the present invention. The organic light emitting display device according to the seventh embodiment of the present invention may include the same components as the previously described embodiments. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

When compared to FIG. 3, the organic light emitting display device disclosed in FIG. 10 may have a band pass filter disposed on at least one wavelength conversion layer (170, 171, 172).

In detail, the first band pass filter 600 is disposed in an area corresponding to the first emission area EA1, and the second band pass filter 601 is disposed in an area corresponding to the second emission area EA2. . More specifically, the first band pass filter 600 is disposed between the first wavelength conversion layer 170 and the second electrode 160 of the organic light emitting element (EL), and the second band pass filter 601 is the first electrode 160. 2 It may be disposed between the wavelength conversion layer 171 and the second electrode 160.

Here, the first band pass filter 600 and the second band pass filter 601 may serve to block light in a specific wavelength range. For example, the first band pass filter 600 and the second band pass filter 601 may block light having a high spectral intensity at a wavelength of 450 nm to 460 nm.

Meanwhile, the first light emitted from the organic light emitting device EL passes through the first wavelength conversion layer 170 and the converted second light is incident on the first band pass filter 600. At this time, the first band pass filter 600 may block the first light that has not been converted into the second light despite passing through the first wavelength conversion layer 170. Through this, by blocking unnecessary light with high spectral intensity in the wavelength range of 450 nm to 460 nm in the first emission area EA1, second light with excellent color reproduction can be emitted.

In addition, the third light converted by passing the first light emitted from the organic light emitting element (EL) through the second wavelength conversion layer 171 is incident on the second band pass filter 601. At this time, the second band pass filter 601 may block the first light that has not been converted into the third light despite passing through the second wavelength conversion layer 171. Through this, third light with excellent color reproduction rate can be emitted from the second emission area EA1 by blocking unnecessary light with high spectral intensity in the wavelength range of 450 nm to 460 nm.

As such, the organic light emitting display device according to the seventh embodiment of the present invention has the band pass filters 600 and 601 disposed between at least one wavelength conversion layer (170, 171, 172) and the second electrode 160. , unnecessary first light is blocked in the first emission area EA1 and the second emission area EA2, thereby improving the color reproduction rate of the organic light emitting display device.

The position of the band pass filter according to the present invention is not limited to FIG. 10 and may be arranged as shown in FIG. 11. Figure 11 is a cross-sectional view of an organic light emitting display device according to an eighth embodiment of the present invention.

The organic light emitting display device according to the eighth embodiment of the present invention may include the same components as the previously described embodiments. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

Referring to FIG. 11, the organic light emitting display device according to the eighth embodiment of the present invention includes a band pass filter (700, 701) on at least one wavelength conversion layer (470, 471, 472) as shown in FIG. 10. Discloses the configuration in which is arranged. However, in Figure 11, the thickness of the organic light-emitting layer 150 may be formed relatively thick depending on the formation process of the organic light-emitting layer 150 disposed on the substrate 100 and the stack structure of the organic light-emitting layer 150.

In this case as well, the first band pass filter 700 is formed on the first wavelength conversion layer 470 and the second wavelength conversion layer 471 respectively disposed in the first emission area (EA1) and the second emission area (EA2). and a second band pass filter 701 may be disposed. In addition, the second electrode of the organic light emitting device (EL) may be disposed on the substrate 100 including the first band pass filter 700 and the second band pass filter 701.

Next, the organic light emitting display device according to the ninth and tenth embodiments of the present invention will be examined with reference to FIGS. 12 and 13. FIG. 12 shows the organic light emitting display device according to the ninth embodiment of the present invention. This is a cross-sectional view. Figure 13 is a cross-sectional view of an organic light emitting display device according to an 11th embodiment of the present invention.

Organic light emitting display devices according to the ninth and tenth embodiments of the present invention may include the same components as the previously described embodiments. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

FIG. 12 discloses a configuration in which a first band pass filter 800 and a second band pass filter 801 are disposed on the first wavelength conversion layer 270 and the second wavelength conversion layer 271 of FIG. 5, respectively. . At this time, the first band pass filter 800 may be disposed between the first wavelength conversion layer 270 and the encapsulation layer 190, and the second band pass filter 801 may be a second wavelength conversion layer ( 271) and the encapsulation layer 190.

FIG. 13 discloses a configuration in which a first band pass filter 900 and a second band pass filter 900 are disposed on the first wavelength conversion layer 370 and the second wavelength conversion layer 271 of FIG. 8, respectively. At this time, the first band pass filter 900 is disposed between the first wavelength conversion layer 370 and the barrier layer 200, and the second band pass filter 901 is disposed between the second wavelength conversion layer 371 and the barrier layer 200. It may be disposed between the barrier layers 200.

As such, the organic light emitting display device according to the seventh to tenth embodiments of the present invention has the effect of improving the color reproduction rate of the organic light emitting display device by disposing a band pass filter on at least one wavelength conversion layer. In addition, the organic light emitting display device according to the seventh to tenth embodiments of the present invention is not limited to the drawings, and may further include a light blocking layer disposed adjacent to each wavelength conversion layer.

Next, with reference to FIG. 14, organic light emitting display devices according to other embodiments of the present invention will be examined as follows. Figure 14 is a plan view of an organic light emitting display device according to another embodiment of the present invention.

Referring to FIG. 14, in the organic light emitting display device according to the present invention, subpixels SP1, SP2, and SP3 are respectively disposed in the area where the gate wire 10 and the data wire 20 intersect. Here, the subpixel is composed of a first subpixel (SP1), a second subpixel (SP2), and a third subpixel (SP3). At this time, the first subpixel (SP1) is a red (R) subpixel, the second subpixel (SP2) is a green (G) subpixel, and the third subpixel (SP3) is a blue (B) subpixel. You can.

That is, in other embodiments of the present invention, one pixel P may be composed of three sub-pixels SP1, SP2, and SP3. At this time, a first wavelength conversion layer 570 and a second wavelength conversion layer 571 may be disposed in the first subpixel (SP1) and the second subpixel (SP2), respectively.

This configuration will be examined in detail with reference to FIGS. 15 to 17 as follows. Figure 15 is a cross-sectional view of an organic light emitting display device according to an 11th embodiment of the present invention. Figure 16 is a cross-sectional view of an organic light emitting display device according to a twelfth embodiment of the present invention. Figure 17 is a cross-sectional view of an organic light emitting display device according to a 13th embodiment of the present invention.

Organic light emitting display devices according to the 11th to 13th embodiments of the present invention may include the same components as the embodiments described above. Descriptions that overlap with the previously described embodiments may be omitted. Additionally, the same components have the same reference numerals.

Referring to FIGS. 15 to 17 , a first wavelength conversion layer and a second wavelength conversion layer are disposed in areas corresponding to the first and second emission areas (EA1) and EA2, respectively.

In detail, in FIG. 15, the first wavelength conversion layer 570 and the second wavelength conversion layer 571 are disposed between the organic light-emitting layer 150 and the second electrode 160. In Figure 16, the first wavelength conversion layer 670 and the second wavelength conversion layer 571 are disposed between the second electrode 160 and the encapsulation layer 290. In addition, Figure 17 discloses a configuration in which the first wavelength conversion layer 770 and the second wavelength conversion layer 771 are disposed between the encapsulation layer 190 and the barrier layer 200.

However, the organic light emitting display device according to the 11th to 13th embodiments of the present invention is not limited thereto, and may further include a band-pass film overlapping at least one wavelength conversion layer among the first and second wavelength conversion layers. there is. Additionally, the organic light emitting display device according to the 11th to 13th embodiments of the present invention may further include a light blocking layer disposed adjacent to at least one wavelength change layer.

As such, the organic light emitting display device according to embodiments of the present invention includes an organic light emitting layer that emits light of the same color in each light emitting region and a wavelength conversion layer in at least one light emitting region, thereby forming an organic light emitting layer. The forming process can be simplified and material costs can be reduced.

In addition, in the organic light emitting display device according to embodiments of the present invention, a band pass filter is disposed on at least one wavelength conversion layer, thereby blocking unnecessary first light in at least one light emitting area to improve the color gamut of the organic light emitting display device. There is an effect that can be improved.

In addition, organic light emitting display devices according to embodiments of the present invention have at least one wavelength conversion layer and a light blocking layer adjacent to each other in a non-emission area, thereby preventing light passing through the wavelength conversion layer from mixing with each other. It works.

The features, structures, effects, etc. described in the above-described embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person with ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the description has been made focusing on the embodiments above, this is only an example and does not limit the present invention, and those skilled in the art will understand the above examples without departing from the essential characteristics of the present embodiments. You will be able to see that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented.

130: first electrode
140: Bank pattern
150: Organic light emitting layer
160: second electrode
170: First wavelength conversion layer
171: Second wavelength conversion layer
172: Third wavelength conversion layer

Claims (15)

A substrate divided into a plurality of sub-pixels;
An organic light emitting device that emits first light and includes a first electrode, an organic light emitting layer, and a second electrode;
a wavelength conversion layer disposed overlapping with the first electrode in a region corresponding to at least one light-emitting region of the plurality of sub-pixels and converting the first light into any one of second light to fourth light; and
A bank pattern disposed to contact a portion of the upper surface of the first electrode in an area corresponding to at least one non-emission area of the plurality of subpixels,
The organic light-emitting layer is in contact with the top surface of the first electrode and the top surface of the bank pattern,
The first light is blue light, the second light is red light, the third light is green light, and the fourth light is white light.
delete According to claim 1,
One pixel consists of 2 to 4 sub-pixels,
The wavelength conversion layer is disposed in at least one subpixel among 2 to 4 subpixels,
An organic light emitting display device comprising at least one region where a wavelength conversion layer is not disposed in the two to four subpixels.
According to claim 3,
The area where the wavelength conversion layer is not disposed is included in a sub-pixel that emits blue light.
According to claim 1,
An organic light emitting display device wherein the wavelength conversion layer includes quantum dots and optionally includes a conductive material.
According to claim 5,
The quantum dot is an organic light emitting display device that converts first light into any one of second light to fourth light.
According to claim 1,
An organic light emitting display device in which the width of the wavelength conversion layer is not greater than the gap between upper surfaces of the bank patterns disposed adjacently.
According to claim 1,
It includes an encapsulation layer disposed on the organic light emitting device,
The wavelength conversion layer is an organic light emitting display device disposed between a second electrode and an encapsulation layer in the light emitting area.
According to claim 1,
It includes a barrier layer disposed on the organic light emitting device,
The wavelength conversion layer is an organic light emitting display device disposed between an encapsulation layer and a barrier layer in the light emitting area.
According to claim 1,
An organic light emitting display device further comprising a light blocking layer disposed in an area corresponding to a bank pattern in an area corresponding to a non-emission area of a plurality of subpixels.
According to claim 10,
The light blocking layer is disposed between a second electrode and an encapsulation layer in a non-emission area.
According to claim 10,
The light blocking layer is an organic light emitting display device disposed between an encapsulation layer and a barrier layer in a non-emission area.
According to claim 1,
An organic light emitting display device comprising a band pass filter disposed overlapping the wavelength conversion layer in at least one light emitting area and blocking first light.
According to claim 13,
The band pass filter is an organic light emitting display device disposed between a wavelength conversion layer and an encapsulation layer in the light emitting area.
According to claim 13,
The band pass filter is an organic light emitting display device disposed between a wavelength conversion layer and a barrier layer in the light emitting area.

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