KR102419155B1 - Organic Light Emitting Diode Display Device - Google Patents

Abstract

The present invention discloses an organic light emitting display device. The disclosed organic light emitting display device of the present invention includes a first substrate divided into a plurality of sub-pixel areas, a first electrode, an organic light-emitting layer emitting a first light, and a second disposed in each sub-pixel area on the first substrate. The organic light emitting diode includes an electrode and a color conversion layer overlapping a lower portion of the first electrode in at least one of the plurality of sub-pixel regions.

Description

Organic Light Emitting Diode 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 increasing color gamut.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms, and in recent years, 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 diode 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 is particularly inexpensive 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 a structure of an organic light emitting device including a first electrode, a second electrode, and an organic light emitting layer. The bottom emission 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 emission 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, an organic light emitting diode display including an organic light emitting diode having a two-stack structure has an advantage in that it can be driven at a low voltage, and thus its utilization is increasing. Here, the organic light emitting diode having a two-stack structure implements white light using blue and yellow-green (YG) light emitting layers, and the white light passes through the color filter and is the same as the color filter disposed on each sub-pixel. emit colored light.

Light generated through the organic light emitting device 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. That is, since the light generated through the organic light emitting device has very low spectral intensity of wavelengths corresponding to deep green and deep red, there is a problem in that color gamut is reduced.

An object of the present invention is to provide an organic light emitting display device capable of improving panel efficiency and color gamut in an organic light emitting display device including an organic light emitting layer emitting white light.

The organic light emitting display device of the present invention for solving the problems of the prior art as described above includes a first substrate divided into a plurality of sub-pixel regions, each sub-pixel region on the first substrate, a first electrode, and a first An organic light emitting diode including an organic light emitting layer emitting light and a second electrode, and a color conversion layer overlapping a lower portion of the first electrode in at least one of the plurality of sub pixel areas.

Here, the first light may be white light. The first color conversion layer disposed in the first sub-pixel area included in the plurality of sub-pixel areas may convert the first light into second light having a wavelength of 620 nm to 640 nm. In addition, the second color conversion layer disposed in the second sub-pixel area included in the plurality of sub-pixel areas may convert the first light into third light having a wavelength of 520 nm to 560 nm.

In addition, the thickness of the first electrode or the thickness of the color change layer of the organic light emitting diode display of the present invention may be different in each sub-pixel region.

In the organic light emitting display device according to the present invention, unnecessary light in a wavelength region of 450 nm to 460 nm and a wavelength region of 540 nm to 560 nm due to the first color conversion layer in the first sub-pixel region has a wavelength of 620 nm to 640 nm. By converting to light, panel efficiency and color gamut are increased.

In addition, in the organic light emitting display device according to the present invention, unnecessary light in a wavelength region of 450 nm to 460 nm is converted into light having a wavelength of 520 nm to 560 nm due to the second color conversion layer in the second sub-pixel region, thereby improving panel efficiency. and color gamut is increased.

1 is a diagram schematically illustrating a display device according to example embodiments.
2 is a plan view of an organic light emitting display device according to a first exemplary embodiment of the present invention.
3 is a cross-sectional view taken along line A-A' of the organic light emitting diode display according to the first exemplary embodiment of the present invention.
4A is a diagram illustrating a structure of an organic light emitting diode disposed in a first sub-pixel region.
4B is a diagram illustrating a structure of an organic light emitting diode disposed in a second sub-pixel region.
5 is a cross-sectional view illustrating an organic light emitting diode display including a first electrode according to another exemplary embodiment of the present invention.
6 is a cross-sectional view illustrating an organic light emitting display device according to a second exemplary embodiment of the present invention.
7 is a cross-sectional view illustrating an organic light emitting display device according to a third exemplary embodiment of the present invention.
8 is a cross-sectional view illustrating an organic light emitting display device according to a fourth exemplary embodiment of the present invention.
9 is a cross-sectional view illustrating an organic light emitting display device according to a fifth exemplary embodiment of the present invention.
10 is a cross-sectional view illustrating an organic light emitting display device according to a sixth 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.

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

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but other components may be interposed between each component. It should be understood that each component may be “interposed” or “connected”, “coupled” or “connected” through another component.

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 10 according to the embodiments, a plurality of first lines VL1 to VLm are formed in a first direction (eg, a vertical direction), and a second direction (eg, a horizontal direction) is formed. ), a display panel 50 on which a plurality of second lines HL1 to HLn are formed, a first driver 20 for supplying a first signal to a plurality of first lines VL1 to VLm, and a plurality of second lines. It includes a second driving unit 30 for supplying a second signal to the two lines HL1 to HLn, and a timing controller 140 for controlling the first driving unit 20 and the second driving unit 30 .

The display panel 50 includes a plurality of first lines VL1 to VLm formed in a first direction (eg, a vertical direction) and a plurality of second lines HL1 to HLn formed in a second direction (eg, a horizontal direction). A plurality of pixels (P: Pixels) are defined according to the intersection of . Each of the first and second drivers 20 and 30 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 50 are, for example, formed in a vertical direction (first direction) to transmit data voltages (first signals) to pixel columns in the vertical direction. may be a data line, and the first driver 20 may be a data driver that supplies a 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 50 are formed in the horizontal direction (second direction) to transmit the scan signal (first signal) to the pixel column in the horizontal direction. It may be a wire, and the second driver 30 may be a gate driver that supplies a scan signal to the gate wire.

In addition, a pad part is configured in the display panel 50 to be connected to the first driving part 20 and the second driving part 30 . When a first signal is supplied from the first driver 20 to the plurality of first lines VL1 to VLm, the pad unit transmits it to the display panel 50 , and similarly, the second driver 30 provides a plurality of second lines ( When the second signal is supplied to HL1 to HLn), it is transmitted to the display panel 50 .

Each pixel includes one or more subpixels. The sub-pixel refers to a unit in which a specific color filter is formed or a color filter is not formed and the organic light emitting diode 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.

On the other hand, the organic light emitting display device includes top emission, bottom emission, and dual emission. In a large-area display panel where the display panel increases no matter which light emitting method is selected, a voltage drop of the cathode may occur during the process of forming the cathode on the front side. can Hereinafter, although a top-emitting display device will be mainly described in the present specification, embodiments of the present invention are not limited to top emission, and may be applied to any structure of a display device that prevents a voltage drop of a cathode.

A plan view of the organic light emitting display device according to the first embodiment of the present invention is as follows. 2 is a plan view of an organic light emitting display device according to a first exemplary embodiment of the present invention. 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 60 and the data line 70 intersect. 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 SP3 . In this case, the first sub-pixel SP1 is a red sub-pixel, the second sub-pixel SP2 is a green sub-pixel, the third sub-pixel SP3 is a blue sub-pixel, and the fourth sub-pixel SP4 ) may be a white sub-pixel.

2 illustrates that one pixel P includes four sub-pixels SP1, SP2, SP3, and SP4, but the present invention is not limited thereto, and one pixel P includes three sub-pixels. may include In this case, one pixel P includes a first sub-pixel SP1 , a second sub-pixel SP2 , and a third sub-pixel SP3 . Here, the first sub-pixel SP1 may be a red sub-pixel, the second sub-pixel SP2 may be a green sub-pixel, and the third sub-pixel SP3 may be a blue sub-pixel. 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 area 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, a first electrode 111 of the organic light emitting diode connected to the drain electrode 105 of the thin film transistor is disposed. In addition, the first sub-pixel SP1 region includes a first color conversion layer 150 disposed to overlap the first electrode 111 , and the second sub-pixel SP2 region includes the first electrode and a second color conversion layer 151 disposed to overlap with (111).

A detailed review of the above configuration through a cross-sectional view taken along line A-A' of the organic light emitting display device according to the first embodiment of the present invention is as follows. 3 is a cross-sectional view taken along line A-A' of the organic light emitting diode display according to the first exemplary embodiment of the present invention. Referring to FIG. 3 , the first substrate 100 of the organic light emitting diode display according to the first exemplary embodiment is divided into a plurality of sub-pixel regions. The first substrate 100 may be divided into first to third sub-pixel regions, but is not limited thereto, and the first substrate 100 may be divided into first to fourth sub-pixel regions.

and a thin film transistor Tr disposed on each sub-pixel region of the first substrate 100 , and an organic light emitting device electrically connected to the thin film transistor Tr, and faces the first substrate 100 . and a black matrix 301 , a color filter layer 305 , and a planarization layer 307 disposed on one surface of the second substrate 300 . In addition, the first substrate 100 and the second substrate 300 may be bonded through an adhesive layer 308 or an adhesive layer disposed between the first substrate 100 and the second substrate 300 .

In detail, the thin film transistor Tr includes a gate electrode 101 , an active layer 103 , a source electrode 104 , and a drain electrode 105 . The organic light emitting device includes a first electrode 111 , an organic light emitting layer 200 , and a second electrode 210 . In addition, the color filter layer 305 includes a red color filter pattern 302 , a green color filter pattern 303 , and a blue color filter pattern 304 .

In more detail, the gate electrodes 101 are disposed in each sub-pixel region of the first substrate 100 . The gate electrode 101 is an alloy composed of copper (Cu), molybdenum (Mo), aluminum (Al), silver (Ag), titanium (Ti), or a combination thereof, or indium-tin-oxide ( It may be formed by stacking at least one of indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO). However, the material is not limited thereto, and may be formed of a material of a gate electrode and a gate wiring generally used. In addition, although it is composed of a single metal layer in the drawings, it may be configured by stacking at least two or more metal layers in some cases.

A gate insulating layer 102 is disposed on the first substrate 100 including the gate electrode 101 . An active layer 103 is disposed in each sub-pixel region to overlap the gate electrodes 101 on the first substrate 100 on which the gate insulating layer 102 is disposed. Also, although not shown in the drawing, an etch stop layer for protecting a channel region of the active layer 103 may be further disposed on the active layer 103 .

In addition, a source electrode 104 and a drain electrode 105 overlapping the active layers 103 and spaced apart from each other are provided. The source electrode 104 and the drain electrode 105 are alloys or transparent conductive materials composed of copper (Cu), molybdenum (Mo), aluminum (Al), silver (Ag), titanium (Ti), and combinations thereof. Formed by stacking at least one of indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO) can However, the material is not limited thereto, and may be formed of a material of a generally used data line. In addition, although it is composed of a single metal layer in the drawings, it may be configured by stacking at least two or more metal layers in some cases. In this way, the thin film transistor Tr may be disposed on the first substrate 100 .

An interlayer insulating layer 106 and a planarization layer 107 are disposed on the first substrate 100 including the thin film transistor Tr. Here, a contact hole exposing a portion of the drain electrode 105 of the thin film transistor Tr may be formed in the interlayer insulating layer 106 and the planarization layer 107 .

A first electrode 111 of an organic light emitting diode connected to the drain electrode 105 of the thin film transistor Tr through the contact hole is disposed on the planarization layer 108 . The first electrode 111 includes indium-tin-oxide (ITO), indium-zinc-oxide (IZO), and indium-tin-zinc oxide (Indium-tin-zinc oxide), which are transparent conductive materials. ; ITZO), but the material of the first electrode 111 is not limited thereto.

Here, the reflective layer 110 may be further disposed under the first electrode 111 . The reflective layer 110 reflects the first light emitted from the organic light emitting layer 200 disposed on the first electrode 111 of the organic light emitting device to emit light in the direction of the second substrate 300 of the organic light emitting display device. can

Also, the first electrode 111 and the reflective layer 110 are not limited thereto. This will be reviewed with reference to FIG. 5 as follows. 5 is a cross-sectional view illustrating an organic light emitting diode display including a first electrode according to another exemplary embodiment of the present invention.

As shown in FIG. 5 , a conductive layer 111a overlappingly disposed under the first electrode 111 and the reflective layer 110 may be further disposed. In detail, the reflective layer 110 may be disposed under the first electrode 111 , and the conductive layer 111a may be disposed under the reflective layer 110 .

In this case, the conductive layer 111a is formed of indium-tin-oxide (ITO), indium-zinc-oxide (IZO), and indium-tin-zinc oxide (ITZO). ), but the material of the conductive layer 111a is not limited thereto. Here, the conductive layer 111a may be made of the same material as the first electrode 111 .

In addition, in FIG. 3 , color conversion layers 150 and 151 disposed under the first electrode 111 in at least one sub-pixel area are included. In detail, a first color conversion layer 150 is disposed in the first sub-pixel area, and a second color conversion layer 151 is disposed in the second sub-pixel area.

The first color conversion layer 150 and the second color conversion layer 151 may be disposed on a portion of the upper surface of the reflective layer 110 . Through this, the first color conversion layer 150 and the second color conversion layer 151 may be disposed to expose both ends of the reflective layer 110 . In the region of the reflective layer 110 exposed by the first color conversion layer 150 and the second color conversion layer 151 , the first electrode 111 and the reflective layer 110 may be in contact with each other. Through this, the first electrode 111 and the reflective layer 110 may be electrically connected. In detail, the reflective layer 110 directly contacts the drain electrode 105 of the thin film transistor Tr through a contact hole formed in the planarization layer, and the first electrode 111 connects the reflective layer 110 to the reflective layer 110 . may be electrically connected to the drain electrode 105 through the

The first color conversion layer 150 may convert the first light emitted from the organic light emitting layer 200 into the second light having a wavelength of 620 nm to 640 nm. In addition, the second color conversion layer 151 may convert the first light emitted from the organic light emitting layer 200 into third light having a wavelength of 520 nm to 560 nm. In this case, the first light emitted from the organic light emitting layer 200 may be white light.

The organic light emitting device including the organic light emitting layer 200 emitting white light will be reviewed with reference to FIGS. 4A and 4B as follows. 4A is a diagram illustrating a structure of an organic light emitting diode disposed in a first sub-pixel region. 4B is a diagram illustrating a structure of an organic light emitting diode disposed in a second sub-pixel region.

Referring to FIG. 4A , the organic light-emitting device disposed in the first sub-pixel region of the present invention includes a first electrode 111 , an organic light-emitting layer 200 disposed on the first electrode 111 , and the organic light-emitting layer 200 . ) and a second electrode 210 disposed on it. Here, the first electrode 111 may be an anode electrode of the organic light emitting device, and the second electrode 210 may be a cathode electrode of the organic light emitting device. Here, the second electrode 210 may be made of a transparent conductive material, but the second electrode 210 of the present invention is not limited thereto.

The organic light emitting layer 200 may have a two-stack structure including two light emitting layers. In detail, the organic light emitting layer 200 is a hole injection layer (HIL, 211), a hole transport layer (HTL, 212) disposed on the hole injection layer (HIL, 211), the hole transport layer (HTL, 212) on A first light emitting layer (EML, 213) disposed on the first light emitting layer (EML, 213) A first electron transport layer (ETL, 214) disposed on the electron transport layer (ETL, 214) A charge generation layer (CGL) disposed on the electron transport layer (ETL, 214) , 215), a second light-emitting layer (EML, 216) disposed on the charge generation layer (CGL, 215), a second electron transport layer (ETL, 217) disposed on the second light-emitting layer (EML, 216), and the and an electron injection layer EIL 218 disposed on the second electron transport layer ETL 217 .

Here, the first light emitting layer EML 213 is a layer that emits blue (B) light, and may be configured by doping a host material with a blue (B) dopant. The first light emitting layer (EML, 240) is doped with a fluorescent blue (B) dopant into at least one fluorescent host material selected from the group consisting of an anthracene derivative, a pyrene derivative, and a perylene derivative. It can be done, but is not necessarily limited thereto.

In addition, the second emission layer EML 216 is a layer emitting yellow-green (YG) light, and may be configured by doping a host material with yellow-green (YG) to red (R) dopants. The second emission layer EML 216 may be formed by doping a phosphorescent host material made of a carbazole-based compound or a metal complex with yellow-green (YG) to red (R) dopants. The carbazole-based compound may include CBP (4,4-N,N'-dicarbazole-biphenyl), a CBP derivative, mCP (N,N'-dicarbazolyl-3,5-benzene) or mCP derivative, and the like, and the The metal complex may include, but is not limited to, a phenyloxazole (ZnPBO) metal complex or a phenylthiazole (ZnPBT) metal complex.

In addition, the structure of the organic light emitting layer 200 is not limited thereto. For example, in the organic light emitting layer 200, the hole injection layer (HIL, 211) and the hole transport layer (HTL, 212) may be formed on the same layer, and the first electron transport layer (ETL, 214) and charge generation The layers CGL 215 may also be formed on the same layer. The second electrode 210 of the organic light emitting device is disposed on the hole injection layer 218 of the organic light emitting layer 200 . The second electrode may be made of a transparent metal.

Here, the first emission layer (EML, 213) of the organic emission layer 200 emits blue (B) light having a wavelength of 450 nm to 460 nm, and the second emission layer (EML, 216) has a wavelength of 520 nm to 560 nm. of yellow-green (YG) light. The organic light-emitting layer 200 is a mixture of blue (B) light emitted from the first light-emitting layer (EML, 213) and yellow-green (YG) light emitted from the second light-emitting layer (EML, 216) to form a first light, white light will emit light. In this case, the first 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.

However, the colors of the light emitted from the first light emitting layer EML 213 and the second light emitting layer EML 216 are not limited thereto. It is sufficient if the generated light is mixed and white light is generated from the organic light emitting layer 200 .

In addition, FIG. 4B shows the organic light emitting device disposed in the second sub-pixel region of the present invention, and compared with the organic light emitting device disposed in the first sub-pixel region, the first color conversion layer 150 . Instead, there is a difference only in that the second color conversion layer 151 is disposed.

In FIG. 3 , a portion of the first light emitted from the organic light emitting diode having such a structure is emitted in the direction of the second electrode 210 , and the remaining portion is emitted in the direction of the first electrode 111 . In this case, a portion of the first light emitted in the direction of the first electrode 111 passes through the reflective layer 110 and is again emitted in the direction of the second electrode 210 .

In this case, in the first sub-pixel region of the organic light emitting display device, a portion of the first light emitted in the direction of the second electrode 210 is provided with a red color filter pattern 302 disposed on the second substrate 300 . will pass As such, as a portion of the first light passes through the red color filter pattern 302 , the first light is converted into light having a wavelength of 620 nm to 640 nm.

In addition, a portion of the first light emitted in the direction of the first electrode 111 reaches the reflective layer 110 through the first electrode 111 and the first color conversion layer 150 . At this time, the first light reaching the reflective layer 110 is again emitted in the direction of the second electrode 210 through the first color conversion layer 150 and the first electrode 111 sequentially. In this case, the first light passes through the first color conversion layer 150 and is converted into second light having a wavelength of 620 nm to 640 nm. The second light may pass through the red color filter pattern 302 disposed on the second substrate 300 to make the color of the second light more vivid. As such, the first light emitted from the organic light emitting layer 200 in the first sub-pixel region is finally emitted as the second light having a wavelength of 620 nm to 640 nm.

In addition, the first light having high spectral intensity in the wavelength region of 450 nm to 460 nm and the wavelength region of 520 nm to 560 nm is high in the wavelength region of 620 nm to 640 nm due to the first color conversion layer 150 . By converting to have intensity, there is an effect that high color reproduction is possible.

In addition, in the first sub-pixel region, unnecessary light in a wavelength region of 450 nm to 460 nm and a wavelength region of 520 nm to 560 nm is emitted due to the first color conversion layer 150 in a second wavelength region of 620 nm to 640 nm. By converting to light, panel efficiency is increased. In other words, by converting light of an unnecessary wavelength range into light of a necessary wavelength range, the efficiency of the panel can be increased.

In the second sub-pixel region of the organic light emitting display device, a portion of the first light emitted toward the second electrode 210 passes through the green color filter pattern 303 disposed on the second substrate 300 . . As described above, as a part of the first light passes through the green color filter pattern 303 , the first light is converted into third light having a wavelength of 520 nm to 560 nm.

In addition, a portion of the first light emitted in the direction of the first electrode 111 reaches the reflective layer 110 through the first electrode 111 and the second color conversion layer 151 . At this time, the first light reaching the reflective layer 110 is again emitted in the direction of the second electrode 210 through the second color conversion layer 151 and the first electrode 111 sequentially. In this case, the first light passes through the second color conversion layer 151 and is converted into third light having a wavelength of 520 nm to 560 nm. The third light may pass through the green color filter pattern 303 disposed on the second substrate 300 to make the color of the third light more vivid. As such, the first light emitted from the organic light emitting layer 200 in the second sub-pixel region is finally emitted as the third light having a wavelength of 520 nm to 560 nm.

In addition, the first light having a high spectral intensity in a wavelength region of 450 nm to 460 nm and a wavelength region of 520 nm to 560 nm has a high spectrum in a wavelength region of 520 nm to 560 nm due to the second color conversion layer 151 By converting to have intensity, there is an effect that high color reproduction is possible. In addition, unnecessary light in a wavelength region of 450 nm to 460 nm is converted into third light having a wavelength of 520 nm to 560 nm due to the second color conversion layer 151 in the second sub-pixel region, thereby increasing panel efficiency do.

In addition, in the third sub-pixel region of the organic light emitting diode display, a portion of the first light emitted toward the second electrode 210 passes through the blue color filter pattern 304 disposed on the second substrate 300 . will do As such, as a portion of the first light passes through the blue color filter pattern 304 , the first light is converted into fourth light having a wavelength of 450 nm to 460 nm.

In addition, a portion of the first light emitted in the direction of the first electrode 111 reaches the reflective layer 110 through the first electrode 111 . At this time, the first light reaching the reflective layer 110 is emitted toward the second electrode 210 through the first electrode 111 again. In this case, the first light passes through the blue color filter pattern 304 disposed on the second substrate 300 and is converted into fourth light having a wavelength of 450 nm to 460 nm. As such, the first light emitted from the organic light emitting layer 200 in the third sub-pixel region is finally emitted as the fourth light having a wavelength of 450 nm to 460 nm.

However, the organic light emitting diode display according to the first exemplary embodiment is not limited thereto, and a color conversion layer may be provided under the first electrode 111 even in the third sub-pixel region.

In addition, when a pixel of the organic light emitting diode display includes four sub-pixels, as illustrated in FIG. 3 , the organic light emitting display includes a fourth sub-pixel area that is a white sub-pixel area. In the fourth sub-pixel region of the organic light emitting diode display, a portion of the first light emitted toward the second electrode 210 passes through the second substrate 300 disposed on the second substrate 300 .

In addition, a portion of the first light emitted in the direction of the first electrode 111 reaches the reflective layer 110 through the first electrode 111 . At this time, the first light reaching the reflective layer 110 is emitted toward the second electrode 210 through the first electrode 111 again. In this case, the first light passes through the color filter-unpositioned area 306 provided on the second substrate 300 , so that the wavelength of the first light does not change and is emitted as it is.

In the organic light emitting display device according to the first embodiment of the present invention, the first and second sub-pixel regions each include a first color conversion layer 150 and a second color conversion layer 151 , so that the organic light emitting layer 200 is provided. There is an effect of improving the color gamut by converting the first light emitted from the light into light having a wavelength of 620 nm to 640 nm and 520 nm to 560 nm, respectively.

Next, the organic light emitting display device according to the second embodiment of the present invention will be reviewed with reference to FIG. 6 . 6 is a cross-sectional view illustrating 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. 6 , in the organic light emitting display device according to the second exemplary embodiment of the present invention, an organic light emitting diode device disposed in the first sub-pixel region, the second sub-pixel region, the third sub-pixel region, and the fourth sub-pixel region is illustrated. The thicknesses of the first electrodes 111R, 111G, 111B, and 111 may be different from each other. Here, the first sub-pixel area, the second sub-pixel area, the third sub-pixel area, and the fourth sub-pixel area may be red, green, blue, and white sub-pixel areas, respectively.

Specifically, a thickness of the first electrode 111R disposed in the first sub-pixel area may be greater than a thickness of the first electrode 111G disposed in the second sub-pixel area. In addition, a thickness of the first electrode 111G disposed in the second sub-pixel area may be greater than a thickness of the first electrode 111B disposed in the third sub-pixel area. In addition, the thickness of the first electrode 111B disposed in the third sub-pixel area may be the same as the thickness of the second electrode 111 disposed in the fourth sub-pixel area.

That is, the sum of the thicknesses of the first electrode 111R, the first color conversion layer 150 , the organic light emitting layer 200 and the second electrode 210 disposed in the first sub-pixel region is the second sub-pixel region. It is made larger than the sum of the thicknesses of the first electrode 111G, the second color conversion layer 151 , the organic light emitting layer 200 , and the second electrode 210 disposed on the . In addition, the sum of the thicknesses of the first electrode 111G, the second color conversion layer 151 , the organic light emitting layer 200 , and the second electrode 210 disposed in the second sub-pixel region is the third sub-pixel region. The sum of the thicknesses of the first electrode 111B, the organic light emitting layer 200 and the second electrode 210 disposed in the first electrode 111, the organic light emitting layer 200 and the second It is made larger than the sum of the thicknesses of the electrodes 210 .

As described above, in the organic light emitting diode display according to the second exemplary embodiment of the present invention, the thickness of the first electrodes 111R, 111G, 111B, and 111 disposed in the first to fourth sub-pixel regions is adjusted, thereby forming a micro-cavity (micro-cavity). - By improving the cavity effect, there is an effect to amplify the light efficiency.

Also, the organic light emitting diode display according to the second exemplary embodiment of the present invention is not limited thereto, and may be applied even when three sub-pixels constitute one pixel. Specifically, one pixel area may include a first sub-pixel area, a second sub-pixel area, and a third sub-pixel area. Here, the first sub-pixel area, the second sub-pixel area, and the third sub-pixel area may be red, green, and blue sub-pixel areas, respectively.

In this case, a thickness of the first electrode 111R disposed in the first sub-pixel area may be greater than a thickness of the first electrode 111G disposed in the second sub-pixel area. In addition, a thickness of the first electrode 111G disposed in the second sub-pixel area may be greater than a thickness of the first electrode 111B disposed in the third sub-pixel area. Through this, the micro-cavity effect can be improved.

In addition, the present invention can improve the micro-cavity effect through the structure of the organic light emitting diode display according to the third embodiment. 7 is a cross-sectional view illustrating 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. 7 , the thickness of the first color conversion layer 550 disposed in the first sub-pixel area of the organic light emitting diode display according to the third embodiment of the present invention is the second color disposed in the second sub-pixel area. It may be made thicker than the thickness of the conversion layer 551 . Here, the thickness of the first electrode 111 disposed in the first and second sub-pixel regions may be the same, but the organic light emitting display device according to the third embodiment of the present invention is not limited thereto, and may be formed differently. may be

That is, the sum of the thicknesses of the first electrode 111 , the first color conversion layer 550 , the organic light emitting layer 200 , and the second electrode 210 disposed in the first sub-pixel region is the second sub-pixel region. It is made larger than the sum of the thicknesses of the first electrode 111 , the second color conversion layer 551 , the organic light emitting layer 200 , and the second electrode 210 disposed on the .

In addition, the sum of the thicknesses of the first electrode 111 , the second color conversion layer 551 , the organic light emitting layer 200 , and the second electrode 210 disposed in the second sub-pixel region is the third sub-pixel region. The sum of the thicknesses of the first electrode 111 , the organic light emitting layer 200 and the second electrode 210 disposed in the first electrode 111 , the organic light emitting layer 200 and the second It is made larger than the sum of the thicknesses of the electrodes 210 .

As described above, in the organic light emitting display device according to the third exemplary embodiment of the present invention, the microcavity effect can be improved by adjusting the thicknesses of the first color conversion layer 550 and the second color conversion layer 551 .

Next, an organic light emitting display device according to a fourth embodiment of the present invention will be reviewed with reference to FIG. 8 . 8 is a cross-sectional view illustrating an organic light emitting display device 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. 8 , in the organic light emitting diode display according to the fourth embodiment of the present invention, a thin film transistor Tr is disposed on a substrate 100 for each sub-pixel, and an interlayer insulating layer is formed on the thin film transistor Tr. (106) is arranged.

In addition, the organic light emitting display device includes a color filter layer 405 disposed on the interlayer insulating layer 106 . Here, the red color filter pattern 402 is disposed in the first sub-pixel area, the green color filter pattern 403 is disposed in the second sub-pixel area, and the blue color filter pattern 404 is disposed in the third sub-pixel area. are placed When the organic light emitting diode display includes a fourth sub-pixel region that is a white sub-pixel region, the color filter layer 405 may not be disposed on the interlayer insulating layer 106 in the fourth sub-pixel region.

In addition, a color conversion layer may be disposed on at least one of the red or green color filter patterns 402 and 403 . For example, a first color conversion layer 250 is disposed on the red color filter pattern 402 , and a second color conversion layer 251 is disposed on the green color filter pattern 403 . A planarization film 107 is disposed on the substrate 100 including the first color conversion layer 250 and the second color conversion layer 251 , and the first electrode of the organic light emitting diode is formed on the planarization film 107 . 311 , the organic light emitting layer 200 and the second electrode 210 are disposed.

In this case, the first light generated from the organic light emitting layer 200 in the first sub-pixel region passes through the first color conversion layer 250 and is converted into second light having a wavelength of 620 nm to 640 nm. The second light may pass through the red color filter pattern 402 disposed under the first color conversion layer 250 and be emitted to the rear surface of the first substrate 110 .

In addition, the first light generated from the organic light emitting layer 200 in the second sub-pixel region passes through the second color conversion layer 251 and is converted into third light having a wavelength of 520 nm to 560 nm. The third light may pass through the green color filter pattern 403 disposed under the second color conversion layer 251 and be emitted to the rear surface of the first substrate 110 .

As described above, in the organic light emitting diode display according to the fourth embodiment of the present invention, the first and second sub-pixel regions have a first color conversion layer 250 and a second color conversion layer 251 on the interlayer insulating film 106, respectively. By including, the first light emitted from the organic light emitting layer 200 is converted into light having a wavelength of 620 nm to 640 nm and 520 nm to 560 nm, respectively, thereby improving color gamut. That is, the organic light emitting display device according to the fourth embodiment of the present invention can improve color gamut even in the case of the bottom light emitting method.

Next, an organic light emitting display device according to a fifth embodiment of the present invention will be reviewed with reference to FIG. 9 . 9 is a cross-sectional view illustrating an organic light emitting display device according to a fifth embodiment of the present invention. The organic light emitting diode display according to the fifth 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 , in the organic light emitting diode display according to the fifth embodiment of the present invention, a color filter layer 505 is disposed on the interlayer insulating film 106 in each sub-pixel region. In detail, the red color filter pattern 502 is disposed on the interlayer insulating layer 106 in the first sub-pixel region, and the green color filter pattern 503 is disposed on the interlayer insulating layer 106 in the second sub-pixel region. and a blue color filter pattern 504 is disposed on the interlayer insulating layer 106 in the third sub-pixel region.

A planarization layer 107 is disposed on the color filter layer 505 , and a first electrode 411 electrically connected to the drain electrode 105 of the thin film transistor Tr is disposed on the planarization layer 107 . . Here, a color conversion layer may be disposed to overlap at least one of the red or green color filter patterns 502 and 503 and to be in contact with a lower portion of the first electrode 411 .

For example, a first color conversion layer 350 may be disposed under the first electrode 411 in the first sub-pixel region so as to be in contact with the first electrode 411 . In addition, a second color conversion layer 351 may be disposed under the first electrode 411 in the second sub-pixel region so as to be in contact with the first electrode 411 .

In this case, the first color conversion layer 350 and the second color conversion layer 351 may include a conductive material such that the first electrode 411 and the drain electrode 105 are electrically connected to each other. .

In this case, the first light generated from the organic light emitting layer 200 in the first sub-pixel region passes through the first color conversion layer 350 and is converted into second light having a wavelength of 620 nm to 640 nm. The second light may pass through the red color filter pattern 502 disposed under the first color conversion layer 350 and be emitted to the rear surface of the first substrate 110 .

In addition, the first light generated from the organic light emitting layer 200 in the second sub-pixel region passes through the second color conversion layer 351 and is converted into third light having a wavelength of 520 nm to 560 nm. The third light may pass through the green color filter pattern 503 disposed under the second color conversion layer 351 and be emitted to the rear surface of the first substrate 110 .

As described above, the organic light emitting display device according to the fifth embodiment of the present invention has an effect of improving the color gamut even in the case of the bottom light emitting method.

Next, an organic light emitting display device according to a sixth embodiment of the present invention will be reviewed with reference to FIG. 10 . 10 is a cross-sectional view illustrating 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 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. 10 , an organic light emitting display device according to a sixth embodiment of the present invention includes a first substrate (not shown) on which a thin film transistor (not shown) and an organic light emitting device (not shown) are disposed, and the first substrate ( (not shown) and disposed to face, the second substrate 300 including the color filter layer 605 is included.

In this case, the color filter layer 605 includes a red color filter pattern 602 , a green color filter pattern 603 , and a blue color filter pattern 604 . Here, a first color conversion layer 450 is disposed on the red color filter pattern 602 , and a second color conversion layer 451 is disposed on the green color filter pattern 602 . When the organic light emitting diode display of the present invention includes a white sub-pixel, a color filter pattern or a color change layer may not be disposed in the white sub-pixel area.

That is, the organic light emitting display device includes the first color conversion layer 450 disposed on the second substrate 300 , so that the first generated from the organic light emitting layer (not shown) of the organic light emitting device (not shown) is provided. The light may be converted to a second light having a wavelength of 620 nm to 640 nm. In addition, by including the second color conversion layer 451 disposed on the second substrate 300, the first light generated from the organic light emitting layer (not shown) is converted into third light having a wavelength of 520 nm to 560 nm. can do it

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 one embodiment. Furthermore, the 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.

110: reflective layer
111: first electrode
120: organic light emitting layer
150: first color conversion layer
151: second color conversion layer
200: second electrode

Claims (20)

a first substrate divided into a plurality of sub-pixel regions;
an organic light-emitting device disposed in each of the sub-pixel areas on the first substrate and including a first electrode, an organic light-emitting layer emitting first light, and a second electrode;
a color filter layer disposed on the organic light emitting diode; and
and a color conversion layer overlapping a lower portion of the first electrode in at least one sub-pixel area among the plurality of sub-pixel areas;
and the first electrode is disposed between the color filter layer and the color conversion layer.
The method of claim 1,
The first light is white light.
The method of claim 1,
The first color conversion layer disposed in the first sub-pixel area included in the plurality of sub-pixel areas converts the first light into second light having a wavelength of 620 nm to 640 nm.
The method of claim 1,
The second color conversion layer disposed in the second sub-pixel area included in the plurality of sub-pixel areas converts the first light into third light having a wavelength of 520 nm to 560 nm.
The method of claim 1,
Further comprising a reflective layer disposed below the first electrode,
The color conversion layer is disposed between the first electrode and the reflective layer.
6. The method of claim 5,
The color conversion layer is disposed on a portion of an upper surface of the reflective layer, and both ends of the first electrode and the reflective layer are disposed in contact with each other.
The method of claim 1,
and a second substrate facing the first substrate and having at least one color filter pattern in a plurality of sub-pixel regions.
The method of claim 1,
a second substrate disposed to face the first substrate;
Further comprising a color filter layer disposed on one surface of the second substrate,
and the color filter layer includes red, green, and blue color filter patterns.
9. The method of claim 8,
An organic light emitting display device in which a color conversion layer is disposed to overlap with at least one of the red and green color filter patterns.
9. The method of claim 8,
An organic light emitting display device in which a color conversion layer is disposed to be in contact with a lower portion of the first electrode.
11. The method according to claim 9 or 10,
The color conversion layer overlapping the red color filter pattern converts the first light into the second light having a wavelength of 620 nm to 640 nm,
The color conversion layer overlapping the green color filter pattern converts first light into third light having a wavelength of 520 nm to 560 nm.
The method of claim 1,
The thickness of the first electrode is different in at least one of the plurality of sub-pixel areas.
13. The method of claim 12,
The plurality of sub-pixel regions includes red, green, and blue sub-pixel regions;
The thickness of the first electrode is the thickest in the red sub-pixel region and the thinnest in the blue sub-pixel region.
13. The method of claim 12,
The plurality of sub-pixel areas includes red, green, blue, and white sub-pixel areas;
The thickness of the first electrode is the thickest in the red sub-pixel region and the thinnest in the blue and white sub-pixel regions.
The method of claim 1,
The sum of the thicknesses of the first electrode and the color conversion layer disposed in the red sub-pixel area among the plurality of sub-pixels is greater than the sum of the thicknesses of the first electrode and the color conversion layer disposed in the green sub-pixel area;
The thickness of the first electrode and the color conversion layer disposed in the green sub-pixel area is greater than the thickness of the first electrode disposed in the blue sub-pixel area.
16. The method of claim 15,
The thickness of the first electrode disposed in the blue sub-pixel area is the same as the thickness of the first electrode disposed in the white sub-pixel area.
a first substrate divided into a plurality of sub-pixel regions;
an organic light-emitting device disposed on the substrate for each sub-pixel area and comprising a first electrode, an organic light-emitting layer emitting a first light, and a second electrode;
a second substrate disposed to face the first substrate;
a color filter layer disposed on the second substrate and including first to third color filter patterns; and
a first color conversion layer disposed on the first color filter pattern and a second color conversion layer disposed on the second color filter pattern;
a reflective layer disposed under the first electrode;
The color conversion layer is disposed between the first electrode and the reflective layer,
The first color conversion layer and the second color conversion layer are disposed on a portion of an upper surface of the reflective layer, and both ends of the first electrode and the reflective layer are disposed in contact with each other.
18. The method of claim 17,
The first light is white light.
18. The method of claim 17,
The first color conversion layer is an organic light emitting display device for converting the first light into second light having a wavelength of 620 nm to 640 nm.
18. The method of claim 17,
The second color conversion layer converts first light into third light having a wavelength of 520 nm to 560 nm.

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