KR101231849B1 - Organic Light Emitting Display Device - Google Patents

Abstract

Embodiment of the present invention, the substrate; A lower layer formed on the substrate and including a protective film made of a four-layer inorganic film and a first electrode formed on the protective film; And an upper layer formed on the lower layer and including a red, green and blue light emitting layer and a second electrode formed on the light emitting layer, wherein the passivation layer has a total thickness of 200 nm to 1500 nm and includes a lower layer and an upper layer. The device provides an organic light emitting display device characterized in that a traveling direction of a white color coordinate changes at least once at a point 0.017 of? U'v '.

Description

[0001] The present invention relates to an organic light emitting display device,

Embodiments of the present invention relate to an organic light emitting display device.

An organic electroluminescent device used in an organic electroluminescent display device is a self-luminous device in which a light emitting layer is formed between two electrodes. In the organic light emitting display device, electrons and holes are injected into the light emitting layer from an electron injection electrode and a hole injection electrode, respectively, and an exciton in which the injected electrons and holes combine is excited. The device emits light when it falls from the ground state to the ground state.

An organic light emitting display device using an organic light emitting display device includes a top emission type, a bottom emission type, and a dual emission type according to a direction in which light is emitted. According to this, it is divided into passive matrix type and active matrix type.

In the organic light emitting display, when a scan signal, a data signal, a power supply, and the like are supplied to a plurality of subpixels arranged in a matrix form, the selected subpixel emits light, thereby displaying an image.

FIG. 1 is a graph illustrating a change in Δu'v 'of a conventional organic light emitting display device according to a viewing angle, and FIG. 2 is a view illustrating a change in white color coordinates according to FIG. 1.

Some organic light emitting display devices use a microcavity structure to improve display quality. However, in the conventional microcavity structure, as the viewing angle changes as shown in FIG. 1, the white color coordinate moves in one direction as shown in FIG. 2, which causes a large change in the white color coordinate. That is, in the conventional microcavity structure, Δu'v 'is increased according to the viewing angle, and thus the intensity of the RGB is greatly changed according to the viewing angle, and improvement of the microcavity structure is required.

According to an embodiment of the present invention for solving the above-mentioned problems of the background art, an organic microcavity structure in which Δu'v 'is set to 0.02 or less, which is a criterion of specification of a display device, is minimized by minimizing a change in white color according to a viewing angle. An electroluminescent display device is provided.

Embodiments of the present invention as a means for solving the above problems, the substrate; A lower layer formed on the substrate and including a protective film made of a four-layer inorganic film and a first electrode formed on the protective film; And an upper layer formed on the lower layer and including a red, green and blue light emitting layer and a second electrode formed on the light emitting layer, wherein the passivation layer has a total thickness of 200 nm to 1500 nm and includes a lower layer and an upper layer. The device provides an organic light emitting display device characterized in that a traveling direction of a white color coordinate changes at least once at a point 0.017 of? U'v '.

In another aspect, an embodiment of the present invention, a substrate; A lower layer formed on the substrate and including a protective film made of a four-layer inorganic film and a first electrode formed on the protective film; And an upper layer formed on the lower layer and including a red, green, and blue light emitting layer and a second electrode formed on the light emitting layer, wherein the passivation layer has a total thickness of 200 nm to 1500 nm and includes a lower layer and an upper layer. The display device provides an organic light emitting display device characterized in that a traveling direction of a white color coordinate changes at least twice at a 0.009 point of? U'v '.

The display device may reach a final point at which the v 'coordinate is increased from the starting point as the color coordinate of the red color increases in the first direction after moving in the first direction at the starting point of the viewing angle of 0 degrees and then moves in the second direction.

The display element moves in the first direction at the starting point of the viewing angle of 0 degree, moves up in the second direction after the blue color coordinate rises, moves in the second direction after the red color coordinate rises, and moves in the third direction after the green color coordinate rises. Can reach the increased end point.

In the display device, at least two peaks having different heights may appear on the outcoupling curve.

The first peak of the two peaks is represented by a change in thickness from the protective layer included in the lower layer to the light emitting layer included in the upper layer, and the second peak of the two peaks is included in the lower layer. It can be manifested by thickness changes below the interlayer film.

The protective film may have a thickness in which the thickness of the first protective film formed in the lowermost layer is in a range of 50 nm to 500 nm.

The protective film includes a first protective film having a thickness range of 50 nm to 500 nm, a second protective film having a thickness range of 50 nm to 200 nm, a third protective film having a thickness range of 50 nm to 200 nm, and a thickness range of 50 nm to 200 nm. The fourth protective film may have a structure in which the fourth protective film is sequentially stacked on the substrate.

The lower film includes a buffer film formed on the substrate, a gate insulating film formed on the buffer film, a first interlayer film formed on the gate insulating film, a second interlayer film formed on the first interlayer film, and a second interlayer film. The formed protective film and the first electrode formed on the protective film may be included.

The overall thickness of the first interlayer film and the second interlayer film may have a thickness range of 100 nm to 2000 nm.

The embodiment of the present invention has an effect of providing an organic light emitting display device with a micro-cavity structure that minimizes the change in the white color according to the viewing angle and sets Δu'v 'to 0.02 or less, which is a criterion of the display device specification. . In addition, an embodiment of the present invention has an effect of providing an organic light emitting display device that can improve the viewing angle by moving the white color coordinates around the front white color coordinates.

1 is a graph illustrating a change in Δu'v 'of a conventional organic light emitting display device according to a viewing angle.
FIG. 2 is a view illustrating a change in white color coordinates according to FIG. 1. FIG.
3 is a structural diagram of a display device of an organic light emitting display device according to an embodiment of the present invention;
4 is a view for explaining the change in the movement and shape of the outcoupling curve according to the thickness constituting the device.
5 is a graph to help understanding the matching position of the outcoupling curve and the PL.
6 is a graph to help understand how to change the intensity of EL by making the outcoupling curve into two peaks.
FIG. 7 is a Δu'v 'graph obtained from a display device optimized to change at least one progression direction of the white color coordinate according to the first embodiment of the present invention; FIG.
8 is a Δu'v 'graph obtained from a display device optimized to change a traveling direction of a white color coordinate at least twice according to a second exemplary embodiment of the present invention.
9 is a view for explaining an outcoupling relationship according to the thickness of the first protective film included in the protective film.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a structural diagram of a display device of an organic light emitting display device according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the display device of the organic light emitting display device according to the exemplary embodiment includes a substrate SUB, a lower layer TFT, and an upper layer OLED.

The substrate SUB shows glass as an example for forming a display device. However, the substrate SUB includes metal, ceramic, or plastic (polycarbonate resin, acrylic resin, vinyl chloride resin, polyethylene terephthalate resin, polyimide resin, Polyester resin, epoxy resin, silicone resin, fluororesin, etc.) may be selected.

The lower layer TFT is a film in which power supply wiring, data wiring, scan wiring, driving transistor, switching transistor, and capacitor are formed. The lower film TFT includes a buffer film BUF, a gate insulating film GI, an interlayer film ILD, and a passivation film PAS. The buffer film BUF is formed on the substrate SUB and may be formed to protect the lower layer TFT formed in a subsequent process from impurities such as alkali ions flowing out of the substrate SUB. Silicon oxide (SiOx) may be selected as the buffer layer BUF. The gate insulating layer GI is formed on the buffer film BUF and a silicon oxide (SiOx), such as the buffer film BUF, may be selected as a film that insulates the gate electrode of the transistor. The interlayer film ILD is formed on the gate insulating film GI and is a film for distinguishing the layers included in the lower film TFT. It is formed of a two-layer interlayer (ILD2). When the interlayer film ILD is formed of two films, the first interlayer film ILD1 and the second interlayer film ILD2 may be selected as silicon oxide (SiOx) and silicon nitride (SiNx), respectively. The passivation layer PAS includes four passivation layers in which the first to fourth passivation layers PAS1 to PAS4 are sequentially stacked. The first to fourth passivation layers PAS1 to PAS4 have a structure in which silicon nitride (SiNx) having a high refractive index and silicon oxide (SiOx) having a low refractive index are alternately stacked. The first electrode E1 is an electrode connected to the source or drain electrode of the driving transistor, and is selected as a transparent metal such as indium tin oxide (ITO).

The upper layer OLED is a film forming an organic light emitting diode together with the first electrode E1 formed on the lower layer TFT. The upper layer OLED includes an organic light emitting diode including a light emitting part EL and a second electrode E2. The light emitting unit EL includes a hole injection layer HIL, a hole transport layer HTL, a light emitting layer EML, an electron transport layer ETL, and an electron injection layer EIL. The second electrode E2 is selected as an opaque metal such as aluminum (Al).

As described above, the display device of the organic light emitting display device according to the exemplary embodiment has a microcavity structure using a lower layer TFT.

In general, as the microcavity effect is increased, the efficiency and color are improved. In the microcavity device, the outcoupling curve is shifted to a short wavelength depending on the viewing angle, resulting in a significant change in color and efficiency compared to a general device (microcavity-free device). That is, the microcavity applied device changes the color and efficiency of each of the red (R), green (G), and blue (B) formed on the display panel according to the viewing angle, resulting in a mixture of the three colors. ) The color coordinates move badly according to the viewing angle.

Therefore, the organic light emitting display device according to an embodiment of the present invention changes the moving direction of the white color coordinates in order to optimize the change in intensity of each of R, G, and B according to the viewing angle. At this time, the change of direction minimizes Δu'v 'by moving in the direction in which the white color coordinates revolve around 0 degrees. The change in direction occurs at least once and the point of change occurs when Δu'v 'is minimized. On the other hand, the optimization according to the embodiment is to adjust the matching position and the outcoupling curve of the outcoupling curve and PL (photoluminescence) by changing the thickness and the refractive index of the upper layer (OLED) and the lower layer (TFT) of the display device It is achieved by changing the shape.

Hereinafter, specific embodiments of the viewing angle improvement optimization will be described.

4 is a view for explaining the change in the movement and shape of the outcoupling curve according to the thickness of the device, Figure 5 is a graph for helping to understand the matching position of the outcoupling curve and PL, Figure 6 Is a graph to help you understand how to change the intensity of the EL by making the outcoupling curve into two peaks.

As shown in FIG. 4, the outcoupling curve moves from left to right when the thickness of the strong cavity region such as positions 1, 2, and 3 changes. However, if the thickness of the weak cavity area changes, such as position 4, the curve movement is minimized and the shape changes.

Through this principle, the viewing angle enhancement optimization according to the embodiment of the present invention changes the intensity of the EL by adjusting the matching position of the outcoupling curve and the PL as shown in FIG. 5. At this time, the outcoupling curve is made into two peaks P1 and P2 as shown in the left side of FIG. 6 to change the intensity of EL. Referring to the right side of FIG. 6, the luminance and color coordinates of R, G, and B are generated by changing the height and shape of the EL spectrum according to the viewing angle. Referring to the left side of FIG. 6, the outcoupling curve in which the height and shape of the EL spectrum change is moved to the left according to the viewing angle, so that the EL spectrum is changed by the sum of the PL and the outcoupling curve of the luminescent material.

As can be seen from the above description, the outcoupling curve is determined by the structure of the device and the shape of the curve is shifted to the long or short wavelength depending on the thickness of each layer. Therefore, it can be seen that the optimization method of the embodiment is achieved by implementing the device such that the organic material, the lower film thickness, and the refractive index of the display device are changed.

Table 1 is a table showing an example of a micro cavity device structure according to the comparative examples and a micro cavity device structure according to the embodiments.

Table 2 is a table showing the characteristics exhibited by the micro cavity device structure according to the comparative examples described in Table 1 and the micro cavity device structure according to the embodiments.

As can be seen from FIG. 5, Table 1, and Table 2, Examples 1 and 2 satisfy the color coordinate shift characteristics of 0.017 and 0.009, which are 0.02 or less, at a viewing angle of 60 degrees, which is a specification range currently used in televisions, and the like. 1 and 2 show a color coordinate shift characteristic of 0.026 level at or above the viewing angle of 60 degrees.

In order to exhibit the color coordinate movement characteristics as described above, the display devices of Embodiments 1 and 2 are formed such that at least two peaks P1 and P2 having different heights appear on the outcoupling curve.

In the microcavity device structure, the outcoupling curve is formed into two peaks P1 and P2 to change the intensity of the EL. The thickness from the protective film PAS to the light emitting part EL and the thickness below the interlayer film ILD Becomes Here, the first peak P1, which occupies the high position among the two peaks P1 and P2, is achieved by a method of changing the thickness from the protective film PAS to the light emitting part EL. The second peak P2, which occupies the lower position among the two peaks P1 and P2, is achieved by a method of changing the thickness of the interlayer film ILD or less.

As can be seen from Comparative Examples 1 and 2 and Examples 1 and 2, the factor determining the outcoupling curve and thus the color coordinate shift in the microcavity device structure is the protective film PAS determining the peaks P1. To the light emitting portion EL and the thickness below the interlayer film ILD. Among the above factors, the first passivation layer PAS1 determining the thickness of the passivation film PAS and the hole transport layer HTL and the light emitting layer EML determining the thickness of the EL element are the largest factors, while the second peak is obtained. The thickness below the interlayer film ILD for determining (P2) becomes a relatively small factor.

In the background of the above technology, the embodiment minimizes the change in the white color coordinate by changing the R, G, and B intensity points according to the viewing angle in the microcavity device structure. To this end, first, any one of R, G, and B is formed to have a strong intensity between 0 and 20 degrees of the viewing angle. The other forms a strong intensity between 20 and 40 degrees of viewing angle. The remaining one forms a strong intensity between 40 and 60 degrees of the viewing angle. Accordingly, a change occurs in the moving direction of the white color coordinates at 0 to 60 degrees of the viewing angle, which changes the frontal white color coordinate to move the center to improve the viewing angle. Therefore, the embodiment of the microcavity device structure has a change in intensity of R, G, and B according to the angle of the half width of the outcoupling curve (FWHM) through the thickness control and the refractive index of the upper layer OLED and the lower layer TFT; full width at half maximum), the number of peaks in the curve, and the matching position of the PL and outcoupling curves.

As shown in Table 1 and Table 2, the first embodiment of the present invention optimizes the structure of the display device such that the progress direction of the white color coordinate changes at least once at 0.017 of Δu'v 'for viewing angle improvement optimization. .

FIG. 7 is a Δu'v 'graph obtained from a display device that is optimized such that a traveling direction of a white color coordinate changes at least once according to a first embodiment of the present invention.

As shown in FIG. 7, the moving direction of the white color coordinate is changed at least once at Δu'v '. At this time, the color displayed on the display device moves from the starting point S of the viewing angle 0 degrees to the first direction 1 according to the change of the viewing angle, the color coordinate of R rises, and then moves to the second direction 2 and the color coordinate of G rises. While reaching the end point (E) where the v 'coordinates increased from the starting point (S).

As shown in FIGS. 1 and 7, a lower layer TFT is formed to form a display device exhibiting optimized microcavity characteristics as follows.

The passivation layer PAS included in the lower layer TFT includes a first passivation layer PAS1 having a thickness range of 50 nm to 500 nm, a second passivation layer PAS2 having a thickness range of 50 nm to 200 nm, and a thickness of 50 nm to 200 nm. And a third protective film PAS3 having a range, and a fourth protective film PAS4 having a thickness ranging from 50 nm to 200 nm.

The first passivation layer PAS1 preferably has a thickness ranging from 170 nm to 190 nm. In the case of the first passivation layer PAS1, the luminance does not decrease as the second peak P2 of the outcoupling curve becomes larger at 170 nm or less and the angle of the viewing angle increases. Therefore, when the first passivation layer PAS1 is formed to be 170 nm or more, the white color coordinate does not move much in the G (blue) direction according to the viewing angle, thereby improving the viewing angle. In the case of the first passivation film PAS1, the second peak P2 becomes smaller at 190 nm or more, and the luminance of G (blue) according to the viewing angle is lowered. Therefore, when the first passivation layer PAS1 is formed to be 190 nm or less, the white color coordinate does not move in the opposite direction other than the G (blue) direction, thereby improving the viewing angle.

The second passivation film PAS2 to the fourth passivation film PAS4 may preferably have a thickness ranging from 50 nm to 200 nm. In the display device according to the exemplary embodiment, the structure in which the advancing direction of the white color coordinate changes at least once at 0.017 is dependent on the thickness of the first passivation layer PAS1, and thus the thickness of the second passivation layer PAS2 to the fourth passivation layer PAS4. Is formed in the range of 50 nm to 200 nm.

The total thickness of the first interlayer film ILD1 and the second interlayer film ILD2 included in the lower layer PAS is in a thickness range of 100 nm to 2000 nm.

If the total thickness of the first interlayer film ILD1 and the second interlayer film ILD2 is in a thickness range of 100 nm to 2000 nm, the passivation film PAS may be performed within a range that does not deteriorate the performance of the thin film transistor included in the lower layer PAS. ) Together with the microcavity.

As shown in Table 1 and Table 2, the second embodiment of the present invention optimizes the structure of the display device so that the progress direction of the white color coordinate changes at least twice at 0.009 of Δu'v 'for viewing angle improvement optimization. do.

8 is a Δu'v 'graph obtained from a display device that is optimized such that a traveling direction of a white color coordinate changes at least twice according to a second embodiment of the present invention.

As shown in FIG. 8, at? U'v ', the advancing direction of the white color coordinate changes at least twice. At this time, the color displayed on the display element moves from the starting point S of the viewing angle 0 degrees to the first direction 1 according to the change of the viewing angle, the color coordinate of B rises, and then moves to the second direction 2, thereby increasing the color coordinate of R. Afterwards, the color coordinate of G rises in the third direction 3 to reach the end point E of which the v 'coordinate increases from the starting point S. FIG.

As shown in FIG. 8, a lower layer TFT is formed to form a display device exhibiting optimized microcavity characteristics as follows.

The passivation layer PAS included in the lower layer TFT includes a first passivation layer PAS1 having a thickness range of 50 nm to 500 nm, a second passivation layer PAS2 having a thickness range of 50 nm to 200 nm, and a thickness of 50 nm to 200 nm. And a third protective film PAS3 having a range, and a fourth protective film PAS4 having a thickness ranging from 50 nm to 200 nm.

The first passivation layer PAS1 preferably has a thickness ranging from 170 nm to 190 nm. In the case of the first passivation layer PAS1, the luminance does not decrease as the second peak P2 of the outcoupling curve becomes larger at 170 nm or less and the angle of the viewing angle increases. Therefore, when the first passivation layer PAS1 is formed to be 170 nm or more, the white color coordinate does not move much in the G (blue) direction according to the viewing angle, thereby improving the viewing angle. In the case of the first passivation film PAS1, the second peak P2 becomes smaller at 190 nm or more, and the luminance of G (blue) according to the viewing angle is lowered. Therefore, when the first passivation layer PAS1 is formed to be 190 nm or less, the white color coordinate does not move in the opposite direction other than the G (blue) direction, thereby improving the viewing angle.

The second passivation film PAS2 to the fourth passivation film PAS4 may preferably have a thickness ranging from 50 nm to 200 nm. In the case of the second passivation film PAS2 to the fourth passivation film PAS4, the traveling direction of the white color coordinate is changed at least twice. In an exemplary embodiment, the viewing angle is improved by causing the luminance rise time to occur within 20 degrees, moving the white color coordinate moving in the B (blue) direction once in the G (green) direction and then moving in the B (blue) direction again. At this time, when the second passivation layer PAS2 to the fourth passivation layer PAS4 have a low thickness, the left side portion of the outcoupling curve of the G (green) portion becomes too large, so that the same color reference first peak P1 moves to a longer wavelength. do. This occurs when the luminance rise time is 30 degrees or more depending on the viewing angle, so there is no change in the initial G (green) direction, so that the change does not occur twice. In addition, in addition to R (red) where the intensity becomes stronger at 30 degrees or more, the R (red) advancing direction of the white color coordinate is accelerated to decrease the viewing angle. Therefore, when the second passivation layer PAS2 to the fourth passivation layer PAS4 have a high thickness, the left side portion becomes smaller so that the first peak P1 moves to a shorter wavelength. It is preferable to form the thickness in the range of 50 nm to 200 nm since the change in the) direction is also eliminated so that there is no change twice and the viewing angle enhancement effect can be lowered.

The total thickness of the first interlayer film ILD1 and the second interlayer film ILD2 included in the lower layer PAS is in a thickness range of 100 nm to 2000 nm. If the total thickness of the first interlayer film ILD1 and the second interlayer film ILD2 is in a thickness range of 100 nm to 2000 nm, the passivation film PAS may be performed within a range that does not deteriorate the performance of the thin film transistor included in the lower layer PAS. ) Together with the microcavity.

9 is a view for explaining an outcoupling relationship according to the thickness of the first protective film included in the protective film.

As shown in FIG. 9, the outcoupling relationship according to the thickness of the first passivation layer PAS1 included in the passivation layer PAS has a period D of about 120 intervals according to the constructive interference equation of Equation 1 below. .

Equation  One

2ND = mλ, D = m * 120, where m is 1,2,3 ....

In Equation 1, N is a refractive index, D is a thickness, and λ is a wavelength.

Therefore, in the first and second embodiments described above, the optimized thickness of the first passivation layer PAS1 will be described. However, as shown in Equation 1, the first passivation layer PAS1 is formed to have an optimized thickness at a specific period. The outcoupling similar to the embodiment may be shown. However, when the thickness of the first passivation layer PAS1 is out of the ranges of the first and second embodiments, the loss is increased in proportion to the process time, thereby making the device inefficient.

Embodiments of the present invention have an effect of providing an organic light emitting display device having a micro-cavity structure in which Δu'v 'may be set to 0.02 or less, which is a criterion of the display device, by minimizing a change in white color according to a viewing angle. . In addition, an embodiment of the present invention has an effect of providing an organic light emitting display device that can improve the viewing angle by moving the white color coordinates around the front white color coordinates.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

SUB: Substrate TFT: Lower Film
OLED: top film BUF: buffer film
GI: gate insulating film ILD: interlayer film
PAS: Protective Film PAS1: First Protective Film
PAS2: Second Protective Film PAS3: Third Protective Film
PAS4: 4th protective film ILD1: 1st interlayer film
ILD2: Second Layer Interlayer

Claims (10)

Board;
A lower layer formed on the substrate and including a protective film formed of a four-layer inorganic film and a first electrode formed on the protective film; And
An upper layer formed on the lower layer and including a red, green and blue light emitting part and a second electrode formed on the light emitting part;
The protective film has a total thickness of 200nm to 1500nm,
The display device including the lower layer and the upper layer,
At 0.017 of Δu'v ', the advancing direction of the white color coordinate changes at least once,
The display device moves from the starting point of the viewing angle of 0 degrees to the first direction to increase the red color coordinate, and then moves to the second direction to increase the green color coordinate to reach the final point where the v 'coordinate increases from the starting point. Δu'v 'satisfies 0.017 in FIG.
The protective film may be formed,
A first protective film having a thickness range of 50 nm to 500 nm, a second protective film having a thickness range of 50 nm to 200 nm, a third protective film having a thickness range of 50 nm to 200 nm, and a fourth protective film having a thickness range of 50 nm to 200 nm It has a structure laminated in this order on the substrate,
The protective film has a structure in which silicon nitride (SiNx) having a high refractive index and silicon oxide (SiOx) having a low refractive index are alternately stacked.
The lower layer includes a buffer film formed on the substrate, a gate insulating film formed on the buffer film, a first interlayer film formed on the gate insulating film, a second interlayer film formed on the first interlayer film, and the first interlayer film. The protective film formed on the two-layer interlayer, and the first electrode formed on the protective film,
The total thickness of the first interlayer and the second interlayer has a thickness range of 100nm to 2000nm,
The display device has an organic light emitting display, characterized in that the viewing angle at which the intensity of the red, green, and blue light emitting parts is strongly selected is selected between 0 to 20 degrees of the viewing angle, 20 to 40 degrees of the viewing angle, and 40 to 60 degrees of the viewing angle. Device. Board;
A lower layer formed on the substrate and including a protective film formed of a four-layer inorganic film and a first electrode formed on the protective film; And
An upper layer formed on the lower layer and including a red, green and blue light emitting part and a second electrode formed on the light emitting part;
The protective film has a total thickness of 200nm to 1500nm,
The display device including the lower layer and the upper layer,
At 0.009 of Δu'v ', the advancing direction of the white color coordinate changes at least twice,
The display device moves in the first direction at the starting point of the viewing angle of 0 degrees, moves up in the second direction after the blue color coordinate rises, moves in the second direction, moves up in the third direction after the red color coordinate rises, and increases the green color coordinate up to v 'from the starting point. Δu'v 'satisfies 0.009 at a viewing angle of 0 to 60 degrees by reaching the end point with increased coordinates,
The protective film may be formed,
A first protective film having a thickness range of 50 nm to 500 nm, a second protective film having a thickness range of 50 nm to 200 nm, a third protective film having a thickness range of 50 nm to 200 nm, and a fourth protective film having a thickness range of 50 nm to 200 nm It has a structure laminated in this order on the substrate,
The protective film has a structure in which silicon nitride (SiNx) having a high refractive index and silicon oxide (SiOx) having a low refractive index are alternately stacked.
The lower layer includes a buffer film formed on the substrate, a gate insulating film formed on the buffer film, a first interlayer film formed on the gate insulating film, a second interlayer film formed on the first interlayer film, and the first interlayer film. The protective film formed on the two-layer interlayer, and the first electrode formed on the protective film,
The total thickness of the first interlayer and the second interlayer has a thickness range of 100nm to 2000nm,
The display device has an organic light emitting display, characterized in that the viewing angle at which the intensity of the red, green, and blue light emitting parts is strongly selected is selected between 0 to 20 degrees of the viewing angle, 20 to 40 degrees of the viewing angle, and 40 to 60 degrees of the viewing angle. Device. delete delete The method of claim 1,
The display element,
At least two peaks of different heights appear on the outcoupling curve. The method of claim 5,
The first peak, which occupies the highest position among the two peaks, is represented by a change in thickness from the protective layer included in the lower layer to the light emitting layer included in the upper layer.
And a second peak having a lower position among the two peaks is represented by a change in thickness less than or equal to the interlayer film included in the lower layer. delete delete delete delete

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