KR20190063620A - Organic emitting light display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device capable of increasing light extraction efficiency and color reproducibility. According to the present invention, the organic light emitting display device provides a stepped part to an insulation layer located in a lower part of a color filter layer to alleviate and/or remove the stepped part of the color filter layer and simultaneously improve the brightness of light extracted through red, green, and blue color filters. In addition, the organic light emitting display device comprises a substrate, an insulation layer, a color filter layer, a flattening layer, and an organic light emitting element.

Description

[0001] ORGANIC EMITTING LIGHT DISPLAY DEVICE [0002]

The present invention relates to an organic light emitting display device capable of improving light extraction efficiency and color reproducibility.

2. Description of the Related Art Flat panel display devices having excellent characteristics such as thinning, weight reduction, and low power consumption have been widely developed and applied to various fields.

Among flat panel display devices, an organic light emitting display device, also referred to as an organic electroluminescence display device or an organic electroluminescent display device, is a device in which electrons and holes are paired by injecting charges into a light emitting layer provided between a cathode, which is an electron injecting electrode, A light emitting element which emits light while disappearing is used.

Such an organic light emitting display device can be realized on a flexible substrate such as a plastic substrate, and has advantages such as a high contrast ratio because it is a self-emission type display.

In the early stage of the proposed organic light emitting display device, one pixel includes red, green and blue sub-pixels, and the red, green and blue sub-pixels each have an organic light emitting layer emitting red, green and blue light The light emitted from each sub-pixel is combined to display an image.

However, since the organic light emitting layers emitting light of different colors are formed of different materials, not only they have different light emitting efficiencies, but also the lifetime of each sub-pixel is different.

Therefore, in recent years, an organic light emitting display device has been proposed in which light emitted from the organic light emitting layer passes through a color filter to display light of different colors.

FIG. 1 schematically shows a cross section of a conventional organic light emitting display device to which a color filter is applied. For reference, the organic light emitting display device shown in FIG. 1 is a bottom emission display device.

Referring to FIG. 1, a conventional organic light emitting display device 10 includes a substrate 110 on which a thin film transistor and various circuits are mounted, and an organic light emitting diode 150 disposed on the substrate 110.

The organic light emitting diode 150 includes a first electrode 151 electrically connected to the thin film transistor of the substrate 110, an organic light emitting layer 152 emitting white light, and a second electrode 153.

An insulating layer 120 and a planarization layer 140 are disposed between the substrate 110 and the organic light emitting diode 150 and a color filter layer 130 is disposed between the insulating layer 120 and the planarization layer 140.

The color filter layer 130 includes red color filters, green color filters, and blue color filters respectively corresponding to red, green, and blue sub-pixels. Accordingly, the white light emitted from the organic light emitting layer 152 passes through the red color filter, the green color filter, or the blue color filter to emit red, green, or blue light.

At this time, for example, the white light emitted from the organic light emitting layer 152 passes through the color filter layer 130 and absorbs light of a specific wavelength range, so that the color filter layer 130 The extraction efficiency of the light passing therethrough must be reduced.

For example, the red color filter 17a that emits light having a relatively long wavelength absorbs the short-wavelength light from the white light emitted from the organic light-emitting layer 152, and selectively emits only the long- The extraction efficiency of the red light emitted through the red color filter is reduced.

In recent years, attempts have been made to increase the content of colorant contained in the color filter layer 130 to further improve the color reproducibility of light emitted through the color filter layer.

When the content of the coloring material contained in the color filter layer 130 is increased only and the thickness of the color filter layer 130 is kept the same as before, the extraction efficiency of light transmitted through the color filter layer 130 is significantly reduced, The thickness of the color filter layer 130 must be increased.

At this time, since the content of the coloring material contained in the red color filter, the green color filter, and the blue color filter required for realizing high color reproducibility is different from each other, the color of each color forming the color filter layer 130 The thickness of the filter is inevitably different.

In this case, the upper surface of the planarization layer 140 located on the color filter layer 130 is formed by the step difference caused by the height difference between the red color filter 131, the green color filter 132 and the blue color filter 133 An etched step can be formed. The step formed on the planarization layer 140 also forms a step on the first electrode 151 and the second electrode 153 so that the first electrode 151 and / or the second electrode 153 are short- And the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to alleviate a step formed by red, green, and blue color filters having different thicknesses without having to interpose a separate layer for compensating a step of a color filter layer And / or removing the organic electroluminescent device from the organic electroluminescent device, thereby reducing the possibility of short-circuiting the organic electroluminescent device.

The present invention also provides a method of manufacturing a color filter substrate, which is capable of alleviating and / or eliminating a step of a color filter layer by providing a step on an insulating layer located under the color filter layer, and also capable of improving the luminance of light extracted through red, It is an object of the present invention to provide a light emitting display device.

According to an aspect of the present invention, there is provided a method of manufacturing a color filter, comprising: forming a color filter layer on a substrate; An organic light emitting display device is provided.

According to another aspect of the present invention, there is provided an organic light emitting device comprising: a plurality of organic light emitting elements arranged on a color filter layer by being compensated by a plurality of insulating films laminated so that a thickness difference of a red color filter, a green color filter, There is provided an organic light emitting display device which prevents a short circuit

In addition, according to the present invention, the thickness of the insulating layer or the plurality of insulating films located under the color filter layer is determined in consideration of the transmittance of each spectrum depending on the thickness of the insulating layer or the plurality of insulating films, It is possible to provide an organic light emitting display device that compensates for the level difference of the filter layer and improves the brightness of light extracted through the color filter layer.

According to the present invention, it is possible to alleviate and / or eliminate the steps formed by the red, green, and blue color filters having different thicknesses without having to interpose a separate layer for compensating the step of the color filter layer. Thus, the possibility that the organic light emitting element located on the color filter layer is short-circuited can be reduced.

According to the present invention, it is possible to match the transmittance of each spectrum and the spectrum of light extracted through the color filter layer according to the thickness of the insulating layer or the plurality of insulating films, which compensate the step of the color filter layer, Can be improved.

FIG. 1 schematically shows a cross section of a conventional organic light emitting display device to which a color filter is applied.
2 is an enlarged view of the X region in Fig.
3 is a schematic cross-sectional view of an organic light emitting display device according to an embodiment of the present invention.
4 is an enlarged view of the X region in Fig.
5 is a graph showing the transmittance of each spectrum according to the thickness of the insulating layer.
6 is a schematic cross-sectional view of an OLED display device according to another embodiment of the present invention.
7 is an enlarged view of the X region in Fig.

Hereinafter, the organic light emitting display device according to various embodiments of the present invention will be described in detail.

Generally, an organic light emitting display device can be divided into a top emission type and a bottom emission type according to a direction of light emission.

3 is a schematic cross-sectional view of an organic light emitting display device of a lower emission type according to an embodiment of the present invention. In particular, FIG. 3 shows an area corresponding to one pixel, and one pixel includes an area corresponding to red, green and blue sub-pixels.

Referring to FIG. 3, the organic light emitting display device according to an embodiment of the present invention compensates for the thickness difference of the red color filter, the green color filter, and the blue color filter by the step of the insulating layer, In order to prevent a short circuit.

More specifically, the organic light emitting display device 200 includes a substrate 210 on which a thin film transistor and various circuits are mounted, and an organic light emitting diode 270 disposed on the substrate 210.

The substrate 210 may be a substrate made of a material such as glass or plastic. Particularly, in the organic light emitting display device of the lower emission type, the substrate 210 is preferably a transparent substrate which emits light passing through the color filter layer 250 to the outside.

In addition, the substrate 210 is a thin film transistor substrate, and the thin film transistor 220 is provided on the inner surface of the substrate 210 facing the organic light emitting device 270.

Specifically, a gate electrode 221 is disposed on a substrate 210, a gate insulating layer 231 is formed on the substrate 210 and the gate electrode 221 to insulate the gate electrode 221 from the active layer 222, .

An active layer 222 and an etch stopper 232 are located on the gate insulating layer 231 and a source electrode 223 and a drain electrode 232 are formed on the active layer 222 and the etch stopper 232, (224).

The source electrode 223 and the drain electrode 224 are electrically connected to the active layer 222 in a manner in contact with the active layer 222 and occupy some area on the etch stopper 232.

For convenience of description, only the thin film transistors among various thin film transistors that can be included in the OLED display 200 are shown in this specification. In this specification, the thin film transistor 220 is described as an inverted staggered structure, but a thin film transistor having a coplanar structure may also be used.

An insulating layer 240 is disposed on the thin film transistor 220 and a color filter layer 250 is disposed on the insulating layer 240. The color filter layer 250 may include a red color filter, a green color filter, and a blue color filter as layers for converting the color of the white light emitted from the organic light emitting layer 272. [ Here, the red color filter, the green color filter, and the blue color filter are located in regions corresponding to the red, green, and blue sub-pixels, respectively.

Further, the color filter layer 250 is located on the insulating layer 240 in a region corresponding to the light emitting region. Here, the light emitting region may mean a region where the organic light emitting layer 272 emits light.

A planarization layer 260 is disposed on the insulating layer 240 and the color filter layer 250. The planarization layer 260 may be formed on the planarization layer 260 by reducing and / or removing the step between the insulation layer 240 and the color filter layer 250 to form a planar upper surface, Thereby preventing a short circuit between the first electrode 271 and / or the second electrode 273.

The planarization layer 260 may be formed of, for example, an acrylic resin, a phenol resin, a polyimide resin, a polyamide resin, an unsaturated polyester resin, a polyphenylene resin, a polyphenylene sulfide resin, And the like.

On the planarization layer 260, an organic light emitting device 270 for emitting white light and a bank layer 233 for partitioning a light emitting region are located.

The organic light emitting diode 270 is disposed on the planarization layer 260 and is disposed on the first electrode 271 and the first electrode 120 that are electrically connected to the thin film transistor 220. The organic light emitting diode 270 emits white light, And a second electrode 273 as a reflective cathode located on the organic light emitting layer 272. [

The first electrode 271 is preferably formed of a transparent conductive oxide so that light emitted from the organic light emitting layer 272 can be emitted toward the bottom. As the material of the first electrode 271, a transparent conductive oxide may be used as the transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), gallium doped zinc oxide (GZO), zinc tin oxide (Gallium Tin Oxide) or FTO (Fluorine doped Tin Oxide).

The second electrode 273 may be formed of a metal such as Mo, MoW, Cr, Ag, APC (Ag-Pd-Cu alloy), Al or Al alloy to reflect light emitted from the organic light emitting layer 272 downward. A reflective metal or an alloy thereof. Alternatively, it may be in the form of being provided with a reflective film formed of a reflective metal or an alloy thereof on the transparent conductive oxide.

The organic light emitting layer 272 may include a hole transport layer, a hole injection layer, a light emitting material layer, an electron injection layer, and an electron transport layer from the top of the first electrode 271.

Referring to FIG. 4, which is an enlarged view of the X region of FIG. 3, the color filter layer 250 of the OLED display 200 according to an exemplary embodiment of the present invention includes a red color filter 251, A color filter 252 and a blue color filter 253.

At this time, the thickness d1 of the red color filter 251 may be larger than the thickness d2 of the green color filter 252 and the thickness d3 of the blue color filter 253. Further, the thickness of the green color filter 252 may be larger than the thickness of the blue color filter 253.

The thickness difference of such a color filter can be caused by a difference in the content of colorant contained in the color filter in order to realize the characteristics of each color filter.

That is, the content of the coloring agent contained in the red color filter 251 having a thickness larger than the thickness of the green color filter 252 and the blue color filter 253 is not contained in the green color filter 252 and the blue color filter 253 May be higher than the content of the colorant.

At this time, when the thickness of the red color filter 251 is substantially equal to or similar to that of the green color filter 252 and the blue color filter 253 but only the content of the coloring agent is increased, The density of the colorant is increased and the light extraction efficiency through the red color filter 251 may be remarkably lowered.

Accordingly, the color reproducibility of light transmitted through the color filter can be improved in consideration of the color characteristics of the coloring agent by differently forming the thickness of the color filter, with similar density of the coloring agent in the color filter.

In most of the red colorants known so far, the color reproducibility is lower than that of the green colorant and the blue colorant. Therefore, it is desirable to provide a color filter having a high content of a red colorant relative to a green colorant and a blue colorant in order to realize a high color reproducibility.

The color filter layer 250 of the OLED display 200 according to an exemplary embodiment of the present invention includes a red color filter 251, a green color filter 252, and a blue color filter 253 having different thicknesses from each other Wherein the thickness of the red color filter 251 is greater than the thickness of the other color filters.

The green color filter 252 may be formed thicker than the blue color filter 253 and the content of the coloring agent contained in the green color filter 252 may be larger than the content of the coloring agent contained in the blue color filter 253 Can be more.

In general, the level difference layer, which is provided separately from the planarization layer 260 or the planarization layer 260, may be formed to alleviate and / or remove the step between the insulation layer 240 and the color filter layer 250 to form a flat upper surface . The level difference compensating layer may be provided to compensate for the height difference between the upper surface of the red color filter 251, the green color filter 252 and the blue color filter 253 included in the color filter layer 250.

However, it is possible to compensate for the thickness difference between the red color filter 251, the green color filter 252, and the blue color filter 253 included in the color filter layer 250 by simply using the planarization layer 260 , The planarization layer 260 has no effect on the luminance of the light extracted through the color filter layer 250.

The red color filter 251, the green color filter 252, and the blue color filter 252 included in the color filter layer 250 through the insulating layer 240 located under the color filter layer 250, The thickness difference between the color filter layer 250 and the color filter layer 250 is compensated for and the spectrum of the light extracted through the color filter layer 250 is matched with the transmittance of each spectrum according to the thickness of the insulating layer 240, The luminance can be further improved.

The thickness h1 of the insulating layer 240 located below the red color filter 251 is determined by the thickness h2 of the insulating layer 240 located below the green color filter 252, May be smaller than the thickness h3 of the insulating layer 240 located under the lower electrode 253. The green color filter 252 and the blue color filter 253 included in the color filter layer 250 can be formed by differentiating the thickness of the insulating layer 240 according to the type of the color filter disposed at the upper part, ) Can be alleviated and / or eliminated.

Here, the insulating layer 240 may be formed of a material such as SiO ₂ , SiN _x, and / or SiO _x N _y, and may preferably be an SiO ₂ insulating layer. The difference in the thickness of the insulating layer 240 may be imparted by etching in which the insulating layers are formed to have different heights depending on the type of the color filter disposed on the upper portion after forming the insulating layer of the single layer.

5 is a graph showing the transmittance of each spectrum according to the thickness of the SiO ₂ insulating layer.

Referring to FIG. 5, the insulating layer 240 shows a different transmittance depending on the spectrum, and the change in the transmittance varies depending on the thickness of the insulating layer.

Accordingly, when the thickness of the insulating layer 240 is varied in consideration of the spectrum of light extracted through the color filter located above the insulating layer 240, it is possible to further improve the brightness of light extracted through the color filter .

For example, when the insulating layer 240 has a high transmittance at 550 nm to 650 nm, red light passing through the red color filter 251 through matching with the red color filter 251 is reflected by the insulating layer 240 It is possible to reduce the possibility of absorption and consequently further improve the luminance of the red light.

Tables 1 to 3 below show the color filter 251, the green color filter 252, and the blue color filter 253, which have different thicknesses,

The color coordinates and the luminance characteristics according to the thickness of the SiO ₂ insulating layer 240 are shown.

Thickness (㎛) SiO ₂ thickness Color coordinate Luminance Red color filter (A) x y Y 3.1 1000 0.677 0.319 0.80 2000 0.677 0.319 0.91 3000 0.677 0.319 0.81 4000 0.677 0.319 0.90 5000 0.677 0.318 0.82 6000 0.676 0.320 0.88 7000 0.678 0.318 0.84 8000 0.676 0.320 0.86 9000 0.678 0.318 0.85 10000 0.676 0.320 0.85

Thickness (㎛) SiO ₂ thickness Color coordinate Luminance Green color filter (A) x y Y 2.5 1000 0.263 0.663 2.96 2000 0.265 0.664 3.36 3000 0.261 0.663 3.02 4000 0.268 0.663 3.28 5000 0.258 0.664 3.10 6000 0.270 0.661 3.19 7000 0.257 0.666 3.18 8000 0.269 0.659 3.13 9000 0.259 0.668 3.22 10000 0.267 0.658 3.11

Thickness (㎛) SiO ₂ thickness Color coordinate Luminance Blue color filter (A) x y Y 2.4 1000 0.143 0.049 0.55 2000 0.142 0.051 0.58 3000 0.143 0.048 0.59 4000 0.143 0.050 0.55 5000 0.142 0.051 0.60 6000 0.143 0.048 0.57 7000 0.142 0.051 0.56 8000 0.142 0.049 0.59 9000 0.143 0.049 0.57 10000 0.142 0.051 0.58

Considering the color coordinates and luminance characteristics of the red color filter 251, the green color filter 252 and the blue color filter 253 according to the thickness of the SiO ₂ insulating layer 240 shown in Tables 1 to 3 The steps of the layer 240 can be designed as shown in the following table.

division Thickness (㎛) Luminance Step
(탆) Item Red green blue Red green blue Design 1 Color filter 3.1 2.5 2.4 0.90
(ref) 3.28
(ref) 0.55
(ref) 0.7 Insulating layer 0.4 0.4 0.4 Total thickness 3.5 2.9 2.8 Design 2 Color filter 3.1 2.5 2.4 0.91
(1.4%) 3.36
(2.6%) 0.60
(8.4%) 0.6 Insulating layer 0.2 0.2 0.5 Total thickness 3.3 2.7 2.9 Design 3 Color filter 3.1 2.5 2.4 0.80
(-11.1%) 3.18
(-3.1%) 0.59
(7.9%) 0 Insulating layer 0.1 0.7 0.8 Total thickness 3.2 3.2 3.2 Design 4 Color filter 3.1 2.5 2.4 0.91
(1.4%) 3.13
(-4.4%) 0.57
(2.9%) 0 Insulating layer 0.2 0.8 0.9 Total thickness 3.3 3.3 3.3 Design 5 Color filter 3.1 2.5 2.4 0.81
(-10.3%) 3.22
(-1.9%) 0.58
(4.7%) 0 Insulating layer 0.3 0.9 One Total thickness 3.4 3.4 3.4 Design 6 Color filter 3.1 2.5 2.4 0.90
(0.0%) 3.22
(-1.9%) 0.59
(7.9%) 0.3 Insulating layer 0.4 0.9 0.8 Total thickness 3.5 3.4 3.2

Referring to the design 1 of Table 4, the red color filter 251, the green color filter 252, and the blue color filter 253 have different thicknesses from each other, and the insulating layer 240, And the thickness thereof was designed to be 0.4 탆.

As a result, the level difference of the top surface of the red color filter 251, the green color filter 252 and the blue color filter 253 is 7,000 A at the maximum, which is provided on the planarization layer 260 as well as on the planarization layer 260 There is a level difference at which the first electrode 271 and / or the second electrode 273 of the organic light emitting diode 270 are short-circuited.

In design 2, the thickness of the color filter is the same as that of the design 1, and the thickness of the insulation layer 240 located under the red color filter 251 and the green color filter 252 in relation to the design 1 is set to 0.2 μm And the thickness of the insulating layer 240 located under the blue color filter 253 is designed to be 0.5 mu m.

As a result, although the luminance of light passing through the red color filter 251, the green color filter 252 and the blue color filter 253 with respect to the design 1 is increased, the red color filter 251, the green color filter 252, It can be confirmed that the step height of the upper surface of the blue color filter 253 is maximum 6,000 Å.

On the other hand, in the case of Design 3 to Design 5, the sum of the thicknesses of the red color filter 251 and the insulating layer 240 located under the red color filter 251, the sum of the thicknesses of the green color filter 252 and the green color filter 252 And the thickness of the insulating layer 240 located below the blue color filter 253 are equal to each other so that the total thickness of the insulating layer 240 ) Was designed.

As a result, in the case of the design 3 designed to have a total thickness of the color filter and the insulating layer 240 of 3.2 占 퐉 and the design 5 designed to have a thickness of 3.4 占 퐉, It is confirmed that the step of the color filter 251, the green color filter 252 and the blue color filter 253 is completely removed, but the luminance of the red light transmitted through the red color filter 251 is reduced by about 10%.

On the other hand, in the design 4 designed to have a total thickness of the color filter and the insulating layer 240 of 3.3 m, the luminance of the green light transmitted through the green color filter 252 was reduced by about 4% 251 and the blue light passing through the blue color filter 253 is increased.

In design 6 designed to have a step height of the upper surface of the red color filter 251, the green color filter 252 and the blue color filter 253 to a maximum of 3,000 ANGSTROM, green light The luminance of the red light passing through the red color filter 251 and the blue light passing through the blue color filter 253 can be similar or increased to other design values.

Based on the results of the design 4 and the design 6, according to the present invention, the step of the color filter layer 250 is alleviated by the insulating layer 240 having a stepped height so as to have different heights, The luminance of light extracted through the color filter layer can be further improved by matching the transmittance of each spectrum according to the thickness of the insulating layer and the spectrum of light extracted through the color filter layer.

Accordingly, according to the present invention, the insulating layer 240 having a stepped portion having different heights depending on the type of the color filter disposed on the upper portion is divided into a red color filter 251, a green color filter 252, The first electrode 271 and / or the second electrode 273 of the organic light emitting diode 270 located above the color filter layer 250 may be short-circuited Can be prevented.

6 is a schematic cross-sectional view of an OLED display device according to another embodiment of the present invention.

Referring to FIG. 6, the organic light emitting display device according to another embodiment of the present invention compensates for the thickness difference of the red color filter, the green color filter, and the blue color filter by a plurality of insulating films stacked to form a step toward the top, So as to prevent short-circuiting of the organic light emitting element located on the filter layer.

More specifically, the organic light emitting display device 300 includes a substrate 310 on which a thin film transistor and various circuits are mounted, and an organic light emitting diode 370 disposed on the substrate 310. The substrate 310 is a thin film transistor substrate and the thin film transistor 320 is provided on the inner surface of the substrate 310 facing the organic light emitting device 370.

Specifically, a gate electrode 321 is disposed on the substrate 310, a gate insulating layer 331 is formed on the substrate 310 and the gate electrode 321 to insulate the gate electrode 321 from the active layer 322, .

An active layer 322 and an etch stopper 332 are located on the gate insulating layer 331 and a source electrode 323 and a drain electrode 324 are formed on the active layer 322 and the etch stopper 332, .

An insulating layer 340 is disposed on the thin film transistor 320 and a color filter layer 350 is disposed on the insulating layer 340. A planarization layer 360 is disposed on the insulating layer 340 and the color filter layer 350. The planarization layer 360 may be formed on the planarization layer 360 by reducing and / or removing a step between the insulation layer 340 and the color filter layer 350 to form a planar upper surface, Thereby preventing a short circuit between the first electrode 371 and / or the second electrode 373.

On the planarization layer 360, an organic light emitting device 370 for emitting white light and a bank layer 333 for partitioning a light emitting region are located. The organic light emitting device 370 is disposed on the planarization layer 360 and includes a first electrode 371 electrically connected to the thin film transistor 320 and a second electrode 372 disposed on the first electrode 320, And a second electrode 373 located on the light emitting layer 372 and the organic light emitting layer 372.

Referring to FIG. 7, which is an enlarged view of the X region of FIG. 6, the color filter layer 350 includes a red color filter 351, a green color filter 352, and a blue color filter 353 having different thicknesses from each other The thickness difference between the red color filter 351, the green color filter 352 and the blue color filter 353 can be compensated by a plurality of insulating films 341, 342 and 343 stacked to form a step toward the top .

The first insulating layer 341 forming the lowermost layer of the insulating layer 340 contacts the red color filter 351 and is located on the first insulating layer 341 and has a smaller area than the first insulating layer 341 The second insulating film 342 forming a step with the first insulating film 341 is in contact with the green color filter 352. The third insulating film 343 which is located on the second insulating film 342 and has a smaller area than the second insulating film 342 and forms a step with the second insulating film 342 is formed on the blue color filter 353, Contact with

 The luminance of the red light extracted through the red color filter 351 is improved by matching the spectrum of the red light extracted through the red color filter 351 with the transmittance of each spectrum according to the thickness of the first insulating film 341 .

In the case of the green color filter 352 or the blue color filter 353, the sum of the spectrum of the green light or the blue light extracted through the green color filter 352 or the blue color filter 353 and the thickness of the first insulating film 341 and the second insulating film 342, The luminance of the green light or the blue light extracted through the green color filter 352 or the blue color filter 353 by matching the transmittances of the spectra corresponding to the sum of the thicknesses of the first insulating film 341, the second insulating film 342, the third insulating film 343, Can be improved.

Accordingly, according to the present invention, the steps of the color filter layer 350 are alleviated and / or removed by the plurality of insulating films 341, 342, and 343 stacked so as to have different heights depending on the type of the color filter disposed on the upper side The luminance of the light extracted through the color filter layer can be further improved by matching the transmittance of each spectrum according to the thickness of the insulating film stacked and the spectrum of light extracted through the color filter layer.

The plurality of insulating films 341, 342, and 343 stacked to have different heights depending on the type of the color filter disposed on the upper side are connected to the red color filter 351, the green color filter 352, and the blue color filter 353, A short circuit occurs in the first electrode 371 and / or the second electrode 373 of the organic light emitting diode 370 located above the color filter layer 350, .

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is therefore to be understood that such changes and modifications are intended to be included within the scope of the present invention unless they depart from the scope of the present invention.

Claims (9)

Board;
An insulating layer located on the substrate and having a step on an upper surface thereof;
A color filter layer disposed on the substrate, the color filter layer including a red color filter, a green color filter, and a blue color filter;
A planarization layer disposed on the color filter layer;
An organic light emitting diode (OLED) disposed on the planarization layer;
/ RTI >
Wherein the thicknesses of the red color filter, the green color filter and the blue color filter are different from each other, and the thickness difference of the red color filter, the green color filter and the blue color filter is compensated by the step of the insulating layer,
Organic light emitting display device.
The method according to claim 1,
Wherein the thickness of the red color filter is larger than the thickness of the green color filter and the blue color filter,
Organic light emitting display device.
The method according to claim 1,
Wherein the content of the coloring material contained in the red color filter is larger than the content of the coloring material contained in the green color filter and the blue color filter,
Organic light emitting display device.
The method according to claim 1,
Wherein the step of the upper surface of the red color filter, the green color filter, and the blue color filter is 4,000A or less,
Organic light emitting display device.
The method according to claim 1,
Wherein the thickness of the insulating layer located under the red color filter is smaller than the thickness of the insulating layer located below the green color filter and the blue color filter,
Organic light emitting display device.
Board;
An insulating layer located on the substrate and having a step on an upper surface thereof;
A color filter layer disposed on the substrate, the color filter layer including a red color filter, a green color filter, and a blue color filter;
A planarization layer disposed on the color filter layer;
An organic light emitting diode (OLED) disposed on the planarization layer;
, ≪ / RTI &
Wherein the insulating layer is composed of a plurality of insulating films laminated so as to form a step toward an upper portion,
Wherein the thicknesses of the red color filter, the green color filter, and the blue color filter are different from each other, and the thickness difference of the red color filter, the green color filter, and the blue color filter is compensated by a step formed by the plurality of insulating films ,
Organic light emitting display device.
The method according to claim 6,
Wherein the plurality of insulating films comprise:
A first insulating layer located on the substrate;
A second insulating layer located on the first insulating layer and having a smaller area than the first insulating layer;
A third insulating layer located on the second insulating layer and having a smaller area than the second insulating layer;
/ RTI >
Organic light emitting display device.
8. The method of claim 7,
Wherein the red color filter is in contact with the first insulating film,
Wherein the green color filter is in contact with the second insulating film,
Wherein the blue color filter includes a first insulating layer,
Organic light emitting display device.
The method according to claim 6,
Wherein the step of the upper surface of the red color filter, the green color filter, and the blue color filter is 4,000A or less,
Organic light emitting display device.

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