JP2012038556A - Organic el display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an organic EL display device improved in chromaticity viewing angle characteristics and simple in manufacturing processes.SOLUTION: An organic EL display device 1 includes: a red emitting organic EL element 20R; a green emitting organic EL element 20G; and a blue emitting organic EL element 20B. In the organic EL display device, each of the organic EL elements has a first electrode 21, an organic EL layer 22 including a luminous layer and the a first electrode 23; the red emitting organic EL element 20R, the green emitting organic EL element 20G and the blue emitting organic EL element 20B satisfy the relational expressions represented by the following formulae (1-1), (1-2) and (1-3), respectively; and a viewing angle adjustment layer 24 is provided in the red emitting organic EL element 20R. 3/4≤2L/λ+Φ/(2π)≤5/4 (1-1) 7/4≤2L/λ+Φ/(2π)≤9/4 (1-2) 7/4≤2L/λ+Φ/(2π)≤9/4 (1-3)

Description

  The present invention relates to an organic EL display device.

  As one method for improving the light emission efficiency of an organic EL display device, a method using an optical resonant structure is known. Here, there are two types of methods for enabling the use of the optical resonant structure.

  The first method enabling the use of the optical resonant structure is a method of forming the optical resonant structure in the organic EL element. Specifically, an optical resonant structure is formed by a reflective electrode that is a constituent member of an organic EL element and sandwiches an organic EL layer including a light emitting layer, and a semitransparent electrode on the light extraction side, and has a specific wavelength. This is a method for improving the light extraction efficiency. When this method is employed, the optical path length L between the reflective electrode and the translucent electrode is determined by the following formula (A) according to the peak wavelength λ of the spectrum of light output from each organic EL element.

2L / λ + Φ / (2π) = m (A)
(In the formula (A), m represents an integer of 1 or more, Φ represents a phase shift between the reflective electrode and the semitransparent electrode, and λ represents the emission wavelength of each organic EL element. (The emission wavelength is the maximum peak wavelength of the spectrum of light emitted from the organic EL element.)

  In the formula (A), when m = 1, in the three primary colors of red, green, and blue organic EL elements, the film thickness of the organic EL layer included in each element is red: about 90 nm, green: about 75 nm, Blue: about 60 nm. Generally, when the organic EL layer has a thickness of 80 nm or less, a short leak is likely to occur between the reflective electrode and the semitransparent electrode. This short leak causes problems such as a decrease in luminous efficiency of the organic EL display device and generation of non-lighted pixels. Therefore, in the green and blue organic EL elements, it is necessary to adjust the film thickness of the organic EL layer so that m = 2 in the formula (A) for the purpose of preventing short leak. On the other hand, in the red organic EL element, if m = 2 in the formula (A), the film thickness of the organic EL layer is increased, so that the drive voltage is increased and the power consumption of the organic EL display device is increased. Therefore, in the red organic EL element, m in the formula (A) is preferably 1. FIG. 4 is a schematic cross-sectional view showing a conventional organic EL display device. In the organic EL display device 100 of FIG. 4, the first electrode 121, the organic EL layer 122 (122R, 122G, 122B), and the second electrode 123 are laminated on the substrate 110 in this order. , 120G, 120B are provided. The organic EL elements (120R, 120G, 120B) are sealed with a sealing member 130. In the organic EL display device 100 of FIG. 4, the red organic EL layer 122R is thinner than the green organic EL layer 122G and the blue organic EL layer 122B.

  The second method enabling the use of the optical resonant structure is a method of providing an optical resonant structure on the light extraction side electrode of the organic EL element. As a specific example of this method, there is a method disclosed in Patent Document 1. That is, this is a method of improving the light extraction efficiency by laminating optical resonance layers having different film thicknesses for each color on the light extraction side electrode of the organic EL display device.

  On the other hand, chromaticity viewing angle performance is also an important factor when evaluating display quality in an organic EL display device. Here, the chromaticity viewing angle performance is a color shift of a display image from the front direction when the organic EL display device is viewed from an oblique direction. Here, Patent Document 2 discloses that Δu′v ′, which is a parameter serving as a color shift index, is preferably 0.02 or less as a preferable chromaticity viewing angle performance of the display device.

JP 2007-027108 A JP 2008-298814 A

  Here, in order to prevent short leaks and reduce power consumption in the organic EL display device, the value of m for each color is obtained when the optical path length L between the reflective electrode and the translucent electrode is obtained based on the formula (A). If is set, there may be a problem that the luminance viewing angle distribution is greatly different for each color. For example, when m = 1 is set for red organic EL elements and m = 2 is set for green and blue organic EL elements, the luminance viewing angle distribution is greatly different between red and green / blue. Thus, when the luminance viewing angle distribution is greatly different in the organic EL elements of the respective colors, the chromaticity when the organic EL display device is viewed obliquely deviates greatly from the chromaticity in the front direction. Will be significantly reduced.

  FIG. 5 is a diagram showing the luminance viewing angle dependency (viewing angle characteristics) of the organic EL elements of the respective colors in the organic EL display device of FIG. In the formula (A), m = 1 is set for red organic EL elements, and m = 2 is set for green and blue organic EL elements. Then, as shown in FIG. 5, in the red organic EL element, the luminance ratio from the front direction at an angle of 45 ° is about 80%, whereas in the green / blue organic EL element, from the front direction at an angle of 45 °. Is about 30 to 40%. Then, when the display device is viewed obliquely from 45 °, the display image is entirely reddish compared to the front direction, so that the display quality is remarkably deteriorated. Thus, in the formula (A), when m is set for each color, there is a problem that the display quality of the organic EL display device can be remarkably lowered.

  As a method for solving the above-described problem of luminance viewing angle dependency, as described in Patent Document 1, an optical resonant layer having a different film thickness for each color is formed on the light extraction side electrode of the organic EL display device. There is a method of stacking. By this method, it is possible to adjust the luminance viewing angle distribution of each color. However, this method has a problem that the patterning process when forming the optical resonance layer becomes very complicated, and the manufacturing cost increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an organic EL display device that improves chromaticity viewing angle characteristics and has a simple manufacturing process.

The organic EL display device of the present invention includes an organic EL element that emits red, an organic EL element that emits green, and an organic EL element that emits blue.
Each organic EL element has a first electrode, an organic EL layer including a light emitting layer, and a second electrode,
The organic EL element that emits red satisfies the relational expression (1-1) below,
The organic EL element that emits the green color satisfies the relational expression (1-2) below,
The organic EL element emitting blue color satisfies the relational expression (1-3) below,
The organic EL element that emits red light is provided with a viewing angle adjustment layer.

_{3/4 ≦ 2L R / λ R +} Φ R / (2π) ≦ 5/4 (1-1)
7/4 ≦ 2L _G / λ _G + Φ _G / (2π) ≦ 9/4 (1-2)
7/4 ≦ 2L _B / λ _B + Φ _B / (2π) ≦ 9/4 (1-3)
(In Formula (1-1), L _R represents the optical distance from the first electrode to the second electrode in the organic EL element that emits red, λ _R represents the emission wavelength of the organic EL element that emits red, [Phi _R, in represents the sum of the phase shift at the first electrode and the second electrode in the organic EL device that emits red. equation (1-2), L _G from the first electrode in the organic EL device that emits green Represents the optical distance to the second electrode, λ _G represents the emission wavelength of the organic EL element emitting green, and Φ _G represents the sum of the phase shifts of the first electrode and the second electrode in the organic EL element emitting green. In Formula (1-3), L _B represents the optical distance from the first electrode to the second electrode in the organic EL element that emits blue, and λ _B represents the emission wavelength of the organic EL element that emits blue. represents, is [Phi _B, first in the organic EL device that emits blue 1 It represents the sum of the phase shift in the polar and the second electrode.)

  According to the present invention, it is possible to provide an organic EL display device with improved chromaticity viewing angle characteristics and a simple manufacturing process.

It is a cross-sectional schematic diagram which shows the example of embodiment in the organic electroluminescence display of this invention. It is a graph which shows the evaluation result of the chromaticity viewing angle dependence of the organic electroluminescence display produced in Example 1 and Comparative Example 1, respectively. It is a graph which shows the evaluation result of the chromaticity viewing angle dependence of the organic electroluminescence display in Example 2. It is a cross-sectional schematic diagram which shows the conventional organic EL display apparatus. It is a figure which shows the luminance viewing angle dependence of the organic EL element of each color in the organic EL display apparatus of FIG.

  The organic EL display device of the present invention includes an organic EL element that emits red, an organic EL element that emits green, and an organic EL element that emits blue. Note that a plurality of organic EL elements of each color provided on the substrate may be provided on the substrate. Here, each organic EL element has a first electrode, an organic EL layer including a light emitting layer, and a second electrode. The organic EL element that emits red is provided with a viewing angle adjustment layer. The details of this viewing angle adjustment layer will be described later.

  Hereinafter, embodiments of the organic EL display device of the present invention will be described with reference to the drawings. In the following description, well-known and publicly-known techniques in the technical field can be applied to parts that are not particularly illustrated or described. The embodiments described below are merely examples of the embodiments, and the present invention is not limited thereto.

  FIG. 1 is a schematic cross-sectional view showing an example of an embodiment of the organic EL display device of the present invention. In the organic EL display device 1 of FIG. 1, an organic EL element 20 </ b> R that emits red, an organic EL element 20 </ b> G that emits green, and an organic EL element 20 </ b> B that emits blue are provided on a substrate 10.

  In the organic EL display device 1 of FIG. 1, the organic EL element 20 </ b> R that emits red light has a first electrode 21, an organic EL layer that emits red light (red organic EL layer 22 </ b> R), and a second electrode 23 on the substrate 10. The viewing angle adjusting layer 24 is an organic EL element provided in this order. Here, the viewing angle adjustment layer 24 provided in the organic EL element 20R that emits red specifically reduces the difference in luminance viewing angle dependency (viewing angle characteristics) between red and other colors (blue and green). It is a member provided to do.

  In the organic EL display device 1 of FIG. 1, the organic EL element 20G that emits green light has a first electrode 21, an organic EL layer that emits green light (green organic EL layer 22 </ b> G), and a second electrode 23 on the substrate 10. Are organic EL elements provided in this order.

  In the organic EL display device 1 of FIG. 1, the organic EL element 20 </ b> B that emits blue light has a first electrode 21, an organic EL layer that emits blue light (blue organic EL layer 22 </ b> B), and a second electrode 23 on the substrate 10. Are organic EL elements provided in this order.

  Hereinafter, components of the organic EL display device 1 of FIG. 1 will be described.

  The substrate 10 is made of glass, plastic, silicon or the like. Here, a switching element (not shown) such as a TFT may be formed on the substrate 10.

  The first electrode 21 is patterned on the substrate 10 in a desired shape. Here, the first electrode 21 in FIG. 1 functions as a reflective electrode.

  The material constituting the first electrode 21 is preferably a metal material having a high reflectance or an alloy in which a plurality of metal materials are combined. As the metal material, Al, Ag, Pt, Au, Cu, Pd, Ni and the like are preferable. The first electrode 21 may be a laminated thin film in which a layer made of a metal or an alloy and a layer made of ITO or IZO (registered trademark) having a high work function are laminated in this order.

  The organic EL layer (22R, 22G, 22B) provided on the first electrode 21 includes at least a light emitting layer that emits light of a specific wavelength. The organic EL layer (22R, 22G, 22B) may be composed of only the light emitting layer. A laminate in which a light emitting layer and an organic compound layer other than the light emitting layer, for example, a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, an electron injection layer, and the like are appropriately combined. Can also be adopted. On the other hand, a known organic EL material can be used for each layer constituting the organic EL layer.

  By the way, in the organic EL display device 1 of FIG. 1, since the film thickness of each organic EL layer (22R, 22G, 22B) is different for each color, when forming each organic EL layer (22R, 22G, 22B). , It is necessary to form each color separately (pattern formation). Specifically, the film thickness of the organic EL layer 22R is controlled so that the organic EL element 20R that emits red satisfies the relational expression (1-1) below. Similarly, in the organic EL display device 1 of FIG. 1, the film thickness of the organic EL layer 22G is controlled so that the organic EL element 20G that emits green satisfies the relational expression (1-2) below. In addition, the film thickness of the organic EL layer 22B is controlled so that the organic EL element 20B emitting blue color satisfies the following relational expression (1-3).

_{3/4 ≦ 2L R / λ R +} Φ R / (2π) ≦ 5/4 (1-1)
7/4 ≦ 2L _G / λ _G + Φ _G / (2π) ≦ 9/4 (1-2)
7/4 ≦ 2L _B / λ _B + Φ _B / (2π) ≦ 9/4 (1-3)

In Formula (1-1), L _R represents the optical distance from the first electrode to the second electrode in the organic EL element that emits red, λ _R represents the emission wavelength of the organic EL element that emits red, and Φ _R is the sum (sum) of phase shifts at the first electrode and the second electrode in the organic EL element that emits red, that is, the phase shift at the first electrode and the phase at the second electrode in the organic EL element that emits red. Represents the sum with shift. The phase shift is a change in the phase of light generated on a reflecting surface such as the first electrode or the second electrode.

In Formula (1-2), L _G represents the optical distance from the first electrode to the second electrode in the organic EL element that emits green, λ _G represents the emission wavelength of the organic EL element that emits green, and Φ _G is the sum (sum) of phase shifts at the first electrode and the second electrode in the organic EL element that emits green, that is, the phase shift at the first electrode and the phase at the second electrode in the organic EL element that emits green. Represents the sum with shift.

In Formula (1-3), L _B represents the optical distance from the first electrode to the second electrode in the organic EL element that emits blue, λ _B represents the emission wavelength of the organic EL element that emits blue, and Φ _B is the sum (sum) of phase shifts of the first electrode and the second electrode in the organic EL element emitting blue, that is, the phase shift in the first electrode and the phase in the second electrode of the organic EL element emitting blue. Represents the sum with shift.

That is, when each organic EL layer (22R, 22G, 22B) is formed, the film thickness is applied separately for each color so as to satisfy the expressions (1-1) to (1-3). It is necessary to form (pattern formation). In addition, the optical distance (L _R , L _G , L _B ) of each organic EL layer is represented by Formula (1-4), Formula (1-5), and Formula (1-6), respectively.
L _R = n _R × d _R (1-4)
L _G = n _G × d _G (1-5)
L _B = n _B × d _B (1-6)
(In Formula (1-4), n _R represents the refractive index of the red organic EL layer, and d _R represents the film thickness of the red organic EL layer. In Formula (1-5), n _G represents green. Represents the refractive index of the organic EL layer, d _G represents the film thickness of the green organic EL layer, and in formula (1-6), n _B represents the refractive index of the blue organic EL layer, and d _B represents blue. Represents the thickness of the organic EL layer.)

If only the ideal optical resonator structure is taken into consideration, the equations (1-1), (1-2), and (1-3) are expressed by the following equations (1-1a) and ( Ideally, 1-2a) and formula (1-3a) are used.
2L _R / λ _R + Φ _R / (2π) = 1 (1-1a)
2L _G / λ _G + Φ _G / (2π) = 2 (1-2a)
2L _B / λ _B + Φ _B / (2π) = 2 (1-3a)

  However, when considering the difficulty of controlling the film thickness, the driving voltage of the element itself, and the lifetime, the equations as shown in equations (1-1a), (1-2a), and (1-3a) May not hold. For this reason, it can be said that it is rather better to have a certain numerical range (error range) like the formula (1-1), the formula (1-2), and the formula (1-3).

  For the organic EL layer (22R, 22G, 22B) coating method (pattern formation method), a known coating method (pattern formation) such as a vapor deposition method, a transfer method, a printing method, an ink jet method using a metal mask is used. Method). Of the organic compound layers constituting the organic EL layers (22R, 22G, 22B), layers common to the organic EL elements (20R, 20G, 20B) may be formed in a lump.

  The second electrode 23 provided on the organic EL layer (22R, 22G, 22B) is a translucent electrode made of a material having both high reflectance and high transmittance. This semi-transparent electrode is a thin film electrode in which a metal material having a high reflectance or an alloy formed by combining a plurality of these metal materials is formed thin enough to have optical transparency. The semitransparent electrode may be a laminated electrode in which a plurality of the thin film electrodes are laminated, or a laminated electrode in which the thin film electrode and a transparent conductive film such as ITO or IZO are laminated. As a metal material used as a constituent material of the anti-transparent electrode, Al, Mg, Ag, Au, Ca, Li and the like are preferable. Among these, Ag is particularly preferable because it is a material having a high reflectance, a low absorption rate, and a low specific resistance. The translucent electrode can be formed by a known film formation method, and an evaporation method, a sputtering method, or the like can be used.

  The viewing angle adjustment layer 24 formed only on the second electrode 23 that is a constituent member of the red organic EL element 20R is not particularly limited as long as it is a layer made of a material that transmits light. As a constituent material of the viewing angle adjusting layer 24, for example, an inorganic material such as an oxide, a nitride, or a halide, an organic material constituting an organic EL element, or the like can be used.

The film thickness of the viewing angle adjusting layer 24 is preferably adjusted as appropriate based on the optical path length L _v from the light extraction side surface of the viewing angle adjusting layer 24 to the interface between the second electrode 23 and the viewing angle adjusting layer 24. The Specifically, it is preferable to adjust the optical path length L _v as relationship of the following formula (2) is satisfied.
0.25 ≦ L _v / λ _R ≦ 0.46 (2)
(In Formula (2), λ _R is the same as λ _R shown in Formula (1-1).)

By the optical path length L _v to adjust the thickness of the viewing angle adjustment layer 24 so as to satisfy the equation (2), it is possible to improve the chromaticity viewing angle performance of the organic EL display device. In addition, since the film thickness margin required for the viewing angle adjustment layer 24 obtained by the equation (2) is sufficiently wide, an organic EL display device with high display quality can be manufactured by a simple production process. The film thickness of the viewing angle adjustment layer is preferably 40 nm or more and 100 nm or less.

  By the way, the chromaticity viewing angle performance is evaluated by a parameter Δu′v ′. In a display device such as an organic EL display device, Δu′v ′ is preferably 0.02 or less.

  The viewing angle adjustment layer 24 is formed on the red organic EL element 20 </ b> R using a known coating method (pattern formation method) such as a vapor deposition method, a sputtering method, a CVD method, a transfer method, a printing method, an ink jet method using a metal mask. It can be selectively formed on the second electrode 23 which is a constituent member. For this reason, it is possible to form a thin film to be the viewing angle adjusting layer 24 by a simple film forming process.

  The organic EL display device of FIG. 1 is provided with a protective member 30 that covers the organic EL elements (20R, 20G, 20B) in order to protect the organic EL elements (20R, 20G, 20B) from moisture and oxygen in the atmosphere. ing. As the protection member 30, a transparent sealing member such as a glass lid can be used.

Example 1
The organic EL display device 1 shown in FIG. 1 was produced by the following method.

  Ag film was formed on the substrate 10 by DC sputtering to form an Ag film. At this time, the thickness of the Ag film was set to 100 nm. Next, IZO was formed on the Ag film by DC sputtering to form an IZO film. At this time, the thickness of the IZO film was set to 10 nm. Next, a reflective film (first electrode 21) was formed in a desired shape by patterning a laminated film composed of an Ag film and an IZO film by wet etching. Next, each color organic EL layer (22R, 22G, 22B) was formed in a predetermined position on the reflective electrode by vacuum deposition. In addition, when forming the organic EL layers (22R, 22G, 22B) of the respective colors, the organic EL layers (22R, 22G, 22B) of the respective colors of the formulas (1-1) to (1-3) are pattern-formed. In this case, a selective vapor deposition method using a metal mask was adopted.

  Next, an Ag film was formed by vacuum deposition so as to cover all the organic EL layers (22R, 22G, 22B). At this time, the thickness of the Ag film was set to 12 nm. Next, IZO was formed on the Ag film by DC sputtering to form an IZO film. At this time, the thickness of the IZO film was set to 50 nm. Here, the laminated film composed of the Ag film and the IZO film functions as a translucent electrode (second electrode 23).

Next, a viewing angle adjusting layer 24 was formed by selectively forming Alq ₃ on the second electrode 23 constituting the red organic EL element 20R by vacuum deposition. Here, the film thickness of the viewing angle adjusting layer 24 was 40 nm. In forming the viewing angle adjusting layer 24, a metal mask having an opening only in the red organic EL element portion was used.

  Finally, in a glove box substituted with nitrogen, each organic EL element (20R, 20G, 20B) was sealed with sealing glass (sealing member 30) so as not to come into contact with oxygen and moisture. Thus, the organic EL display device 1 was obtained.

  The obtained organic EL display device was evaluated for chromaticity viewing angle dependency. Specifically, when the obtained organic EL display device displayed white (color temperature 6500K), the chromaticity change Δu′v ′ when the angle was changed from the front was examined.

(Comparative Example 1)
In Example 1, an organic EL display device was obtained by the same method as in Example 1 except that the formation of the viewing angle adjustment layer 24 was omitted.

  The obtained organic EL display device was evaluated for chromaticity viewing angle dependency in the same manner as in Example 1.

  FIG. 2 is a graph showing the evaluation results of the chromaticity viewing angle dependency of the organic EL display devices produced in Example 1 and Comparative Example 1, respectively. In FIG. 2, the x-axis is an angle from the front direction of the organic EL display device, and the y-axis is a chromaticity change Δu′v ′ when viewed from the front direction of the organic EL display device at a predetermined angle. .

  As shown in FIG. 2, Δu′v ′ at a viewing angle of 45 ° was 0.01 (Example 1) and 0.048 (Comparative Example 1), respectively. Here, considering the desirable chromaticity viewing angle performance (Δu′v ′ ≦ 0.02) of the display device, it was shown that the organic EL display device of Example 1 has sufficient display quality. Therefore, it has been shown that the manufacturing process shown in this embodiment can improve the display quality of the organic EL display device itself even with a simple manufacturing process without performing a complicated patterning process. .

(Example 2)
In Example 1, the film thickness of the viewing angle adjusting layer 24 was appropriately changed within the range of 30 nm to 120 nm. Specifically, the film thickness of the viewing angle adjusting layer 24 was set to 30, 40, 50, 60, 70, 80, 90, 100, 110, and 120 nm. Except for this, an organic EL display device was obtained by the same method as in Example 1. The obtained organic EL display device was evaluated for chromaticity viewing angle dependency in the same manner as in Example 1.

FIG. 3 is a graph showing the evaluation results of the chromaticity viewing angle dependency of the organic EL display device in this example. In FIG. 3, the lower part of the x-axis is the parameter value (L _v / λ _R ) shown in Equation (2). In FIG. 3, the upper part of the x-axis is the film thickness of the viewing angle adjustment layer corresponding to the parameter value of the lower part of the x-axis. In FIG. 3, the y-axis is Δu′v ′, which is a parameter value for chromatic viewing angle performance.

From FIG. 3, considering the desirable chromaticity viewing angle performance (Δu′v ′ ≦ 0.02) of the display device, L _v / λ _R is 0.25 or more and 0. 0 as shown in the equation (2). It was found that 46 or less is desirable. 4 that the range of the film thickness of the viewing angle adjusting layer 24 corresponding to the range of L _v / λ _R described above is 40 nm or more and 100 nm or less.

  Therefore, since the film thickness margin required for the viewing angle adjustment layer 24 is sufficiently wide, the organic EL display device of the present invention has high display quality and can be manufactured by a simple production process.

  1: organic EL display device, 10: substrate, 20 (20R, 20G, 20B): organic EL element, 21: first electrode (reflective electrode), 22 (22R, 22G, 22B) organic EL layer, 23: second Electrode, 24: Viewing angle adjustment layer, 30: Sealing member

Claims (4)

It is composed of an organic EL element that emits red, an organic EL element that emits green, and an organic EL element that emits blue.
Each organic EL element has a first electrode, an organic EL layer including a light emitting layer, and a second electrode,
The organic EL element that emits red satisfies the relational expression (1-1) below,
The organic EL element that emits the green color satisfies the relational expression (1-2) below,
The organic EL element emitting blue color satisfies the relational expression (1-3) below,
A viewing angle adjusting layer is provided on the organic EL element that emits red light.
_{3/4 ≦ 2L R / λ R +} Φ R / (2π) ≦ 5/4 (1-1)
7/4 ≦ 2L _G / λ _G + Φ _G / (2π) ≦ 9/4 (1-2)
7/4 ≦ 2L _B / λ _B + Φ _B / (2π) ≦ 9/4 (1-3)
(In Formula (1-1), L _R represents the optical distance from the first electrode to the second electrode in the organic EL element that emits red, λ _R represents the emission wavelength of the organic EL element that emits red, [Phi _R, in represents the sum of the phase shift at the first electrode and the second electrode in the organic EL device that emits red. equation (1-2), L _G from the first electrode in the organic EL device that emits green Represents the optical distance to the second electrode, λ _G represents the emission wavelength of the organic EL element emitting green, and Φ _G represents the sum of the phase shifts of the first electrode and the second electrode in the organic EL element emitting green. In Formula (1-3), L _B represents the optical distance from the first electrode to the second electrode in the organic EL element that emits blue, and λ _B represents the emission wavelength of the organic EL element that emits blue. represents, is [Phi _B, first in the organic EL device that emits blue 1 It represents the sum of the phase shift in the polar and the second electrode.)   The organic EL display device according to claim 1, wherein the viewing angle adjustment layer is a member provided to reduce a difference in viewing angle characteristics between red and another color. The optical path length L _v from the surface on the light extraction side of the viewing angle adjustment layer to the interface between the second electrode and the viewing angle adjustment layer satisfies the relationship of the following formula (2): Item 2. An organic EL display device according to Item 1.
0.25 ≦ L _v / λ _R ≦ 0.46 (2)
(In Formula (2), λ _R is the same as λ _R shown in Formula (1-1).)   4. The organic EL display device according to claim 1, wherein a film thickness of the viewing angle adjustment layer is 40 nm or more and 100 nm or less.

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