KR20220137580A - Organic light emitting display device - Google Patents

Abstract

Disclosed is an organic light emitting display device. The disclosed organic light emitting display device of the present invention may include: a substrate divided into a plurality of sub-pixels; an organic light emitting element which emits a 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 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 particularly, to an organic light emitting display device capable of simplifying a process and preventing color mixing between sub-pixels.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms. Recently, a liquid crystal display device (LCD), a plasma display panel device (PDP), Various flat panel display devices such as an organic light emitting diode display device (OLED) are being used.

Among such display devices, since the organic light emitting display device uses a self-luminous device, a backlight used in a liquid crystal display device using a non-light emitting device is not required, so that it can be lightweight and thin. In addition, the organic light emitting display device has better viewing angle and contrast ratio than the liquid crystal display device, and is advantageous in terms of power consumption. In addition, the organic light emitting display device can be driven with a low DC voltage, has a fast response speed, is strong against external shocks because the internal components are solid, has a wide operating temperature range, and has advantages of low cost in terms of manufacturing cost.

Such an organic light emitting display device displays an image in the form of a top emission method or a bottom emission method according to the structure of an organic light emitting device including a first electrode, a second electrode, and an organic light emitting layer. The bottom light emitting method displays visible light generated from the organic light emitting layer toward the lower side of the substrate on which the TFT is formed, whereas the top light emitting method displays visible light generated from the organic light emitting layer toward the upper side of the substrate on which the TFT is formed.

On the other hand, since the organic light emitting display device forms an organic light emitting layer for each sub-pixel emitting different colors, there is a problem in that the process is complicated. In addition, there is a problem in that color mixing between sub-pixels occurs due to misalignment when the organic light emitting layer is stacked.

Accordingly, there is a demand for an organic light emitting display device capable of solving such a problem.

An object of the present invention is to solve the above problems, and to provide an organic light emitting display device capable of simplifying a process and preventing color mixing between sub-pixels.

The organic light emitting display device of the present invention for solving the problems of the prior art as described above is an organic light emitting device including a substrate divided into a plurality of sub-pixels, a first light emitting device, and a first electrode, an organic light emitting layer, and a second electrode and a wavelength conversion layer disposed to overlap the first electrode in an area corresponding to at least one light emitting area of the plurality of sub-pixels and converting the first light into any one of second to fourth light.

On the other hand, in the organic light emitting display device, one pixel is composed of two to four sub-pixels, the wavelength conversion layer is disposed in at least one sub-pixel among the two to four sub-pixels, and the two to four sub-pixels are The sub-pixel includes at least one non-arranged region of the wavelength conversion layer. Here, the region where the wavelength conversion layer is not disposed may be included in the sub-pixel emitting blue light.

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

In addition, the organic light emitting display device may further include a light blocking layer disposed in a region corresponding to the bank pattern in a region corresponding to the non-emission region.

In addition, the organic light emitting display device may further include a band pass filter disposed to overlap the wavelength conversion layer in at least one light emitting region and blocking 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 includes 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. And it has the effect of reducing the material cost.

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

In addition, in the organic light emitting display device according to the present invention, since at least one wavelength conversion layer and a light blocking layer adjacent to the light blocking layer are disposed in the non-emission region, it is possible to prevent the light passing through the wavelength conversion layer from being mixed with each other.

1 is a diagram schematically illustrating a display device according to example embodiments.
2 is a plan view of an organic light emitting diode display according to example embodiments.
3 is a cross-sectional view of an organic light emitting display device according to a first exemplary embodiment of the present invention.
4 is a diagram illustrating the size of quantum dots included in a wavelength conversion layer disposed in each light emitting region.
5 is a cross-sectional view of an organic light emitting display device according to a second exemplary embodiment of the present invention.
6 is a cross-sectional view of an organic light emitting display device according to a third exemplary embodiment of the present invention.
7 is a cross-sectional view of an organic light emitting diode display according to a fourth exemplary embodiment of the present invention.
8 is a cross-sectional view of an organic light emitting display device according to a fifth exemplary embodiment of the present invention.
9 is a cross-sectional view of an organic light emitting display device according to a sixth exemplary embodiment of the present invention.
10 is a cross-sectional view of an organic light emitting display device according to a seventh exemplary embodiment of the present invention.
11 is a cross-sectional view of an organic light emitting diode display according to an eighth embodiment of the present invention.
12 is a cross-sectional view of an organic light emitting display device according to a ninth exemplary embodiment of the present invention.
13 is a cross-sectional view of an organic light emitting diode display according to an eleventh exemplary embodiment of the present invention.
14 is a plan view of an organic light emitting diode display according to other exemplary embodiments.
15 is a cross-sectional view of an organic light emitting display device according to an eleventh exemplary embodiment of the present invention.
16 is a cross-sectional view of an organic light emitting display device according to a twelfth exemplary embodiment of the present invention.
17 is a cross-sectional view of an organic light emitting display device according to a thirteenth exemplary 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 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 shapes. And in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals refer to like elements throughout.

Advantages and features of the present invention and methods of 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 shapes, and 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 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 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.

The 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. Spatially relative terms should be understood as terms 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.

1 is a diagram schematically illustrating a display device according to example embodiments. Referring to FIG. 1 , in the display device 1000 according to the embodiments, a plurality of first lines VL1 to VLm are formed in a first vertical direction and a plurality of second lines in a second horizontal direction. A display panel 1110 on which (HL1 to HLn) is formed, a first driver 1200 for supplying 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 driving unit 1300 for supplying two signals, a timing controller 1400 for controlling the first driving unit 1200 and the second driving unit 1300 , and the like.

In the display panel 1110 , a plurality of pixels P: Pixel) is defined.

Each of the first driver 1200 and the second driver 1300 described above may include at least one driver IC that outputs a signal for displaying an image.

The plurality of first lines VL1 to VLm formed in the first direction on the display panel 1110 may be, for example, data lines formed in a vertical direction to transmit data voltages (first signals) to pixel columns in the vertical direction. In addition, the first driver 1200 may be a data driver that supplies a data voltage to a 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 wirings formed in the horizontal direction to transmit the scan signal (first signal) to the pixel column in the horizontal direction, The second driver 1300 may be a gate driver that supplies a scan signal to a gate line.

In addition, a pad part is formed in the display panel 1110 to be connected to the first driving unit 1200 and the second driving unit 1300 . When the pad unit supplies a first signal from the first driver 1200 to the plurality of first lines VL1 to VLm, it transmits it to the display panel 1110, and similarly, the second driver 1300 provides a plurality of second lines ( 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 means a unit in which a specific color filter is formed or a color filter is not formed and the organic light emitting device can emit a special color. The colors defined in the sub-pixel 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, the sub-pixel constituting the pixel is also referred to as one pixel region hereinafter. A first line may be disposed for each sub-pixel, and a plurality of sub-pixels constituting a pixel may share a specific first line. The configuration of the pixel/sub-pixel and the first line/second line may be variously changed and implemented, but the present invention is not limited thereto.

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

In addition, the organic light emitting display device may be classified into a top emission type, a bottom emission type, or a dual emission type according to the structure of the organic light emitting device. In the embodiments to be described later, an organic light emitting display device for a top emission type will be mainly described, 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 . 2 is a plan view of an organic light emitting diode display according to example embodiments.

Referring to FIG. 2 , in the organic light emitting diode display according to the present invention, sub-pixels SP1 , SP2 , SP3 , and SP4 are respectively disposed in regions where the gate line 10 and the data line 20 cross each other. Here, the sub-pixel includes a first sub-pixel SP1 , a second sub-pixel SP2 , a third sub-pixel SP3 , and a fourth sub-pixel SP4 .

In this case, the first sub-pixel SP1 is a red ® sub-pixel, the second sub-pixel SP2 is a green (G) sub-pixel, the third sub-pixel SP3 is a blue (B) sub-pixel, and the second sub-pixel SP2 is a blue (B) sub-pixel. The fourth sub-pixel SP4 may be a white (W) sub-pixel.

Meanwhile, although FIG. 2 illustrates that one pixel P is composed of four sub-pixels SP1, SP2, SP3, and SP4, the present invention is not limited thereto, and one pixel P includes two to It may be composed of three sub-pixels. However, in the embodiments to be described below, embodiments in which one pixel P includes four sub-pixels SP1, SP2, SP3, and SP4 will be mainly described.

A driving unit including a thin film transistor is disposed in each of the sub-pixels SP1 , SP2 , SP3 , and SP4 , and a display unit including a light emitting region is disposed above the driving unit. The thin film transistor includes a gate electrode 101 , an active layer 103 , a source electrode 104 , and a drain electrode 105 .

In addition, the first electrode 130 of the organic light emitting device connected to the drain electrode 105 of the thin film transistor is disposed. In addition, a bank pattern 140 is disposed on a portion of the upper surface of the first electrode 130 . A region in which the bank pattern 140 is disposed may be a non-emission region, and a region in which the bank pattern 140 is not disposed may be a non-emission region.

In addition, the first sub-pixel SP1 , the second sub-pixel SP2 , and the fourth sub-pixel SP4 are a first wavelength conversion layer 170 , a second wavelength conversion layer 171 , and a third wavelength conversion layer, respectively. (172). In detail, the first wavelength conversion layer 170 , the second wavelength conversion layer 171 , and the third wavelength conversion layer 172 may be respectively disposed on the first electrode 130 of the organic light emitting diode.

A detailed review of such a configuration with reference to FIG. 3 is as follows. 3 is a cross-sectional view of an organic light emitting display device according to a first exemplary embodiment of the present invention. Referring to FIG. 3 , the organic light emitting diode display according to the first exemplary embodiment includes a plurality of sub-pixels.

In FIG. 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 includes a 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 . The insulating layer 110 is disposed on the substrate 100 including the driving transistor (not shown).

Although FIG. 3 discloses a configuration in which a single 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 thereto, and the substrate 100 is not limited thereto. A multi-layered insulating layer may be disposed thereon.

The first electrode 130 of the organic light emitting device EL is disposed on the insulating layer 100 for each sub-pixel. Although FIG. 3 discloses a configuration in which the first electrode 130 is formed of a single layer, the organic light emitting display device according to the first embodiment of the present invention is not limited thereto, and the first electrode 130 is configured as a multilayer. it might be In this case, the first electrode 130 may include a reflective layer. Through this, an organic light emitting display device of a top emission type can be implemented.

A bank pattern 140 in contact with a portion of an upper surface of the first electrode 130 is disposed. The bank pattern 140 defines light emitting areas EA1 , EA2 , EA3 , and EA4 and non-emission areas NEA of each sub-pixel. In addition, 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 device EL is disposed on the organic light emitting layer 150 . The organic light emitting device EL may emit first light. In this case, the first light may be blue light. For example, the first light may have a spectrum having a maximum intensity between 450 nm and 460 nm.

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

In this case, the first to third wavelength conversion layers 170 , 171 , and 172 may be disposed between the organic emission layer 150 and the second electrode 160 in each emission region. In addition, each of the first to third wavelength conversion layers 170 , 171 , and 172 may include quantum dots and optionally a conductive material. Here, the conductive material allows the first electrode 10 and the second electrode 160 to be electrically connected smoothly.

The quantum dots included in the first to third wavelength conversion layers 170 , 171 , and 172 convert the wavelength of light to emit a specific desired light, and the wavelength that can be converted is different 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.

For the quantum dots, any one material selected from CdSe, ZnSe, ZnO, ZnTe, InP, GaP, InGaN, and InN can be used, and the diameter of the quantum dots is 2 nm to 10 nm. However, the material and diameter of the quantum dots according to the embodiment of the present invention is not limited thereto.

When the size of the quantum dots is reduced, the wavelength of the emitted light is shortened to generate blue-based light, and when the size of the quantum dot is increased, the wavelength of the emitted light is increased to generate red-based light. In addition, the quantum dot may be formed in a dual structure consisting of an inner core and an outer shell surrounding the inner core.

Meanwhile, as illustrated in FIG. 4 , quantum dots having different sizes may be included in each of the wavelength conversion layers 170 , 171 , and 172 disposed in each light emitting region. 4 is a diagram illustrating the size of quantum dots included in a 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 quantum dot included in the second wavelength conversion layer 171 disposed in the second emission region. It may 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 the size of the quantum dots 172a included in the third wavelength conversion layer 172 disposed in the fourth light emission region. It can be made larger than the size.

Therefore, the wavelength of the light passing through the first wavelength conversion layer 170 is made longer than the wavelength of the light passing through the second wavelength conversion layer 171 , and the wavelength of the light passing through the second wavelength conversion layer 171 is the third wavelength conversion layer. It may be made longer than the wavelength of the light passing through (172).

In FIG. 3 , the first wavelength conversion layer 170 disposed in an area corresponding to the first light emitting area EA1 may convert the first light emitted from the organic light emitting layer 150 into the second light. In this case, the second light may be red light. For example, the second light may have a spectrum having a maximum intensity between 630 nm and 640 nm.

In detail, a portion of the first light emitted from the organic light emitting layer 150 in the first light emitting area EA1 travels in the direction of the first wavelength conversion layer 170 , and the remaining portion travels in the direction of the first electrode 130 . can At this time, the first light traveling in the direction of the first wavelength conversion layer 170 is converted into the second light while passing through the first wavelength conversion layer 170 . In addition, the first light traveling in the direction of the first electrode 130 is reflected by a reflective layer (not shown), passes through the first wavelength conversion layer 170 , and is finally converted to the second light, and exits the display device. can be

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

In detail, a portion of the first light emitted from the organic light emitting layer 150 in the second light emitting area EA2 travels in the direction of the second wavelength conversion layer 171 , and the remaining portion travels in the direction of the first electrode 130 . can At this time, the first light traveling in the direction of the second wavelength conversion layer 171 is converted into the third light while passing through the second wavelength conversion layer 171 . In addition, the first light traveling in the direction of the first electrode 130 is reflected by the reflective layer (not shown), passes through the second wavelength conversion layer 171 , and is finally converted into third light, and exits the display device. can be

In addition, the third wavelength conversion layer 172 disposed in an area corresponding to the fourth light emitting area EA4 may convert the first light emitted from the organic light emitting layer 150 into the fourth light. In this case, the fourth light may be white light. For example, the fourth light may be white light having high spectral intensity in a wavelength region of 450 nm to 460 nm and a wavelength region of 540 nm to 560 nm.

In detail, a portion of the first light emitted from the organic light emitting layer 150 in the fourth light emitting area EA4 travels in the direction of the third wavelength conversion layer 172 , and the remaining portion travels in the direction of the first electrode 130 . can At this time, the first light traveling in the direction of the third wavelength conversion layer 172 is converted into the fourth light while passing through the third wavelength conversion layer 172 . In addition, the first light traveling in the direction of the first electrode 130 is reflected by a reflective layer (not shown), passes through the third wavelength conversion layer 172 , and is finally converted into fourth light, and exits to the outside of the display device. 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, so that white light is emitted from the fourth light emitting area EA4 .

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

That is, the first wavelength conversion layer 170 , the second wavelength conversion layer 171 , and the third wavelength conversion layer are respectively formed in the first emission area EA1 , the second emission area EA2 , and the fourth emission area EA4 . By disposing 172 , the first light emitted from the organic light emitting layer 150 may be converted into the second light, the third light, and the fourth light, respectively. In addition, since the wavelength conversion layer is not disposed in the third light emitting area EA3 , the first light emitted from the organic light emitting layer 150 may be emitted as it is.

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

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

In addition, first to third wavelength conversion layers ( By disposing 170 , 171 , and 172 , the second light, the third light, and the fourth unnecessary light are respectively transmitted from the first light-emitting area EA1 , the second light-emitting area EA2 , and the fourth light-emitting area EA4 . By converting to light, there is an effect that can improve the efficiency of the panel.

Meanwhile, an encapsulation layer 190 protecting 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 polarizing plate 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 thereto, and may have a structure in which the touch panel unit 203 is omitted.

Next, an organic light emitting display device according to a second embodiment of the present invention will be described as follows. 5 is a cross-sectional view of an organic light emitting display device according to a second exemplary embodiment of the present invention. The organic light emitting diode display according to the second exemplary embodiment of the present invention may include the same components as those of the above-described exemplary embodiment. A description that overlaps with the above-described embodiment may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 5 , the organic light emitting diode display 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 as compared with FIG. 3 . . 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-emission area NEA in the display area of the organic light emitting diode display.

In this case, the first light-blocking layer 300 may be disposed adjacent to at least one wavelength conversion layer 170 , 171 , and 172 . Here, the first light blocking layer 300 may be formed of an opaque organic material.

In this way, by disposing the first light blocking layer 300 adjacent to at least one wavelength conversion layer 170, 171, 172 in the non-emission area NEA, the wavelength conversion layer 170, 171, 172 passes through There is an effect of preventing the light from being mixed with each other.

In addition, the structure of the organic light emitting diode display according to the present invention is not limited thereto, and may have a structure as shown in FIG. 6 . 6 is a cross-sectional view of an organic light emitting display device according to a third exemplary embodiment of the present invention. The organic light emitting diode display according to the third exemplary embodiment of the present invention may include the same components as those of the above-described exemplary embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 6 , the organic light emitting diode display 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 sub-pixel. (EL) is placed. In addition, wavelength conversion layers 270 and 271,272 may be disposed on 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 light emitting area EA1 , and the second wavelength conversion layer 271 is disposed in an area corresponding to the second light emission area EA2 , , the third wavelength conversion layer 272 is disposed in an area corresponding to the fourth emission area EA4 . Here, the first wavelength conversion layer 270 , the second wavelength conversion layer 271 , and the third wavelength conversion layer 272 are disposed between the second electrode 160 and the encapsulation layer 290 of the organic light emitting diode (EL). can be placed in

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

The first wavelength conversion layer 270 , the second wavelength conversion layer 271 , and the third wavelength conversion layer 272 are formed in a first light emitting area EA1 , a second light emission area EA2 and a fourth light 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 device EL becomes the second light in the first light emitting area EA1 and the second light emitting area The third light may be switched in EA2 and the fourth light may be switched in the fourth light emitting area EA4 .

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

In addition, color mixing of the organic light emitting diode display can be prevented through the structure shown in FIG. 7 . 7 is a cross-sectional view of an organic light emitting diode display according to a fourth exemplary embodiment of the present invention. The organic light emitting diode display according to the fourth embodiment of the present invention may include the same components as those of the above-described embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

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

In this case, the second light blocking layer 310 may be disposed between the second electrode 160 and the encapsulation layer 290 in the non-emission area NEA in the display area of the organic light emitting diode display. The second light blocking layer 310 may prevent mixing of light having different wavelengths passing through the first wavelength conversion layer 270 , the second wavelength conversion layer 271 , and the third wavelength conversion layer 271 .

Next, referring to FIG. 8 , an organic light emitting display device according to a fifth embodiment of the present invention will be described as follows. 8 is a cross-sectional view of an organic light emitting display device according to a fifth exemplary embodiment of the present invention. The organic light emitting diode display according to the fifth exemplary embodiment may include the same components as those of the above-described exemplary embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 8 , an organic light emitting diode display according to a fifth embodiment of the present invention is an organic light emitting diode including a first electrode 130 , an organic light emitting layer 150 , and a second electrode 160 in each sub-pixel. (EL) is placed. In addition, wavelength conversion layers 370 , 371 , and 372 may be disposed on 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 light emitting area EA1 , and the second wavelength conversion layer 371 is disposed in an area corresponding to the second light emission area EA2 , , a third wavelength conversion layer 372 is disposed in an area corresponding to the fourth emission 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 formed of an inorganic film or an organic film, and may be in the form of a film. In addition, although FIG. 8 discloses a configuration in which the barrier layer 200 is a single layer, the fifth embodiment of the present invention is not limited thereto, and the barrier layer 200 may be formed of multiple layers.

The first wavelength conversion layer 370 , the second wavelength conversion layer 371 , and the third wavelength conversion layer 372 are formed in a first light emitting area EA1 , a second light emission area EA2 and a fourth light emission area ( EA2 ), 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 device EL becomes the second light in the first light emitting area EA1, and the second light emission area ( EA2 may be converted to the third light, and in the fourth light emitting area EA4 may be converted to the fourth light.

In addition, color mixing of the organic light emitting display device can be prevented through the structure shown in FIG. 9 . 9 is a cross-sectional view of an organic light emitting display device according to a sixth exemplary embodiment of the present invention. The organic light emitting diode display according to the sixth embodiment of the present invention may include the same components as those of the above-described embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

Referring to FIG. 9 , the organic light emitting diode display according to the sixth exemplary embodiment further includes a third light blocking layer 410 overlapping the bank pattern 140 in the organic light emitting display device illustrated in FIG. 9 . do.

In this case, the third light blocking layer 410 may be disposed between the encapsulation layer 190 and the barrier layer 200 in the non-emission area NEA in the display area of the organic light emitting diode display. In addition, the third light blocking layer 410 may be disposed adjacent to at least one wavelength conversion layer of the first wavelength conversion layer 370 , the second wavelength conversion layer 371 , and the third wavelength conversion layer 372 . have.

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

Next, an organic light emitting display device according to a seventh embodiment of the present invention will be reviewed with reference to FIG. 10 . 10 is a cross-sectional view of an organic light emitting display device according to a seventh exemplary embodiment of the present invention. The organic light emitting diode display according to the seventh embodiment of the present invention may include the same components as those of the above-described embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

In the organic light emitting diode display illustrated in FIG. 10 , as compared with FIG. 3 , a band pass filter may be disposed on at least one wavelength conversion layer 170 , 171 , and 172 .

In detail, the first bandpass filter 600 is disposed in an area corresponding to the first emission area EA1 , and the second bandpass filter 601 is disposed in an area corresponding to the second emission area EA2 . . In more detail, the first bandpass filter 600 is disposed between the first wavelength conversion layer 170 and the second electrode 160 of the organic light emitting device EL, and the second bandpass filter 601 is It may be disposed between the second 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 of a specific wavelength band. 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.

On the other hand, the first light emitted from the organic light emitting device (EL) to the first band pass filter 600, the converted second light passes through the first wavelength conversion layer 170 is incident. In this case, the first band-pass filter 600 may block the first light that is not converted to the second light despite passing through the first wavelength conversion layer 170 . Accordingly, the second light having excellent color reproducibility may be emitted by blocking light having a high spectral intensity in an unnecessary wavelength region of 450 nm to 460 nm in the first emission area EA1 .

In addition, the third light converted from the first light emitted from the organic light emitting device EL through the second wavelength conversion layer 171 is incident to the second band pass filter 601 . In this case, the second band pass filter 601 may block the first light that is not converted to the third light despite passing through the second wavelength conversion layer 171 . Accordingly, the third light having excellent color reproducibility may be emitted by blocking light having a high spectral intensity in an unnecessary wavelength region of 450 nm to 460 nm in the second emission region EA1 .

As described above, in the organic light emitting display device according to the seventh embodiment of the present invention, the band pass filters 600 and 601 are disposed between the at least one wavelength conversion layer 170 , 171 , 172 and the second electrode 160 . , unnecessary first light is blocked in the first light emitting area EA1 and the second light emitting area EA2 , thereby improving the color reproducibility of the organic light emitting diode display.

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 . 11 is a cross-sectional view of an organic light emitting diode display according to an eighth embodiment of the present invention.

The organic light emitting diode display according to the eighth embodiment of the present invention may include the same components as those of the above-described embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

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

Even in this case, 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 light-emitting area EA1 and the second light-emitting area EA2. and a second band-pass filter 701 may be disposed. In addition, a second electrode of the organic light emitting diode EL may be disposed on the substrate 100 including the first band pass filter 700 and the second band pass filter 701 .

Next, an organic light emitting display device according to the ninth and tenth embodiments of the present invention will be reviewed with reference to FIGS. 12 and 13 . FIG. 12 is an organic light emitting display device according to the ninth embodiment of the present invention. It is a cross section. 13 is a cross-sectional view of an organic light emitting diode display according to an eleventh exemplary embodiment of the present invention.

The organic light emitting diode display according to the ninth and tenth embodiments of the present invention may include the same components as those of the above-described embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

FIG. 12 discloses a configuration in which a first bandpass filter 800 and a second bandpass filter 801 are respectively disposed on the first wavelength conversion layer 270 and the second wavelength conversion layer 271 of FIG. 5 . . In this case, 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 includes a second wavelength conversion layer ( 271 ) and the encapsulation layer 190 .

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

As described above, in the organic light emitting display device according to the seventh to tenth embodiments of the present invention, since the band pass filter is disposed on at least one wavelength conversion layer, color gamut of the organic light emitting display device can be improved. 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, referring to FIG. 14 , an organic light emitting display device according to other embodiments of the present invention will be described as follows. 14 is a plan view of an organic light emitting diode display according to other exemplary embodiments.

Referring to FIG. 14 , in the organic light emitting diode display according to the present invention, sub-pixels SP1 , SP2 , and SP3 are respectively disposed in regions where the gate line 10 and the data line 20 cross each other. Here, the sub-pixel includes a first sub-pixel SP1 , a second sub-pixel SP2 , and a third sub-pixel SP3 . In this case, the first sub-pixel SP1 is a red (R) sub-pixel, the second sub-pixel SP2 is a green (G) sub-pixel, and the third sub-pixel SP3 is a blue (B) sub-pixel. can

That is, in other embodiments of the present invention, one pixel P may include three sub-pixels SP1, SP2, and SP3. In this case, a first wavelength conversion layer 570 and a second wavelength conversion layer 571 may be disposed in the first sub-pixel SP1 and the second sub-pixel SP2 , respectively.

A detailed review of such a configuration with reference to FIGS. 15 to 17 is as follows. 15 is a cross-sectional view of an organic light emitting display device according to an eleventh exemplary embodiment of the present invention. 16 is a cross-sectional view of an organic light emitting display device according to a twelfth exemplary embodiment of the present invention. 17 is a cross-sectional view of an organic light emitting display device according to a thirteenth exemplary embodiment of the present invention.

The organic light emitting diode display according to the eleventh to thirteenth embodiments of the present invention may include the same components as those of the above-described embodiments. A description that overlaps with the above-described embodiments may be omitted. Also, the same components have the same reference numerals.

15 to 17 , a first wavelength conversion layer and a second wavelength conversion layer are disposed in areas corresponding to each of the first light emitting area EA1 and the second light emitting area EA2 .

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 FIG. 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, FIG. 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 eleventh to thirteenth 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. have. In addition, the organic light emitting diode display according to the eleventh to thirteenth embodiments of the present invention may further include a light blocking layer disposed adjacent to at least one wavelength change layer.

As described above, 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 includes a wavelength conversion layer in at least one light emitting region, thereby forming the organic light emitting layer. The forming process can be simplified, and there is an effect of reducing material cost.

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

In addition, in the organic light emitting display device according to embodiments of the present invention, at least one wavelength conversion layer and a light blocking layer adjacent to the light blocking layer are disposed in the non-emission region to prevent the light passing through the wavelength conversion layer from being mixed with each other. It works.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiments may be implemented by modification.

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 emitting a first light and including a first electrode, an organic light emitting layer and a second electrode;
a wavelength conversion layer overlapping the first electrode in a region corresponding to at least one emission region of the plurality of sub-pixels and converting the first light into any one of second to fourth lights; and
a bank pattern disposed in contact with a portion of an upper surface of the first electrode in a region corresponding to at least one non-emission region of the plurality of sub-pixels; and
The organic light emitting layer is in contact with an upper surface of the first electrode and an upper surface of the bank pattern.
The method of claim 1,
The first light is blue light.
The method of claim 1,
One pixel is composed of 2 to 4 sub-pixels,
The wavelength conversion layer is disposed on at least one sub-pixel among 2 to 4 sub-pixels,
An organic light emitting diode display including at least one wavelength conversion layer undisposed area in the two to four sub-pixels.
4. The method of claim 3,
The region where the wavelength conversion layer is not arranged is included in the sub-pixel emitting blue light.
The method of claim 1,
The wavelength conversion layer includes quantum dots, and optionally includes a conductive material.
6. The method of claim 5,
The quantum dot is a quantum dot that converts first light into any one of second to fourth light.
The method of claim 1,
A width of the wavelength conversion layer is not greater than an interval between upper surfaces of the bank patterns disposed adjacent to each other.
The method of claim 1,
and an encapsulation layer disposed on the organic light emitting device,
The wavelength conversion layer is disposed between the second electrode and the encapsulation layer in the emission region.
The method of claim 1,
A barrier layer disposed on the organic light emitting device,
The wavelength conversion layer is disposed between the encapsulation layer and the barrier layer in the emission region.
The method of claim 1,
The organic light emitting diode display further comprising a light blocking layer disposed in a region corresponding to the bank pattern in a region corresponding to the non-emission region of the plurality of sub-pixels.
11. The method of claim 10,
The light blocking layer is disposed between the second electrode and the encapsulation layer in the non-emission region.
11. The method of claim 10,
The light blocking layer is disposed between the encapsulation layer and the barrier layer in the non-emission region.
The method of claim 1,
and a band-pass filter overlapping the wavelength conversion layer and blocking the first light in at least one light emitting region.
14. The method of claim 13,
The band-pass filter is disposed between the wavelength conversion layer and the encapsulation layer in the emission region.
14. The method of claim 13,
The band-pass filter is disposed between the wavelength conversion layer and the barrier layer in the emission region.

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