Display device and display panel thereof, and OLED display device

Abstract

The present invention provides a display device and a display panel thereof, and an OLED display device. The OLED display device comprises: a red light emitting structure, a green light emitting structure and a blue light emitting structure. 3z ‑n 3xy )‑(n 1z ‑n 1xy )≥ the first preset value, (n 3z ‑n 3xy )‑(n 2z ‑n 2xy )≥ the second preset value, the range of the first preset value and the second preset value are both 0.1 to 0.3; wherein, n 1z is the sum of the refractive indices of the layers of the red light-emitting structure in the thickness direction, n 1xy is the sum of the refractive indices of the layers of the red light-emitting structure in the vertical thickness direction, n 2z is the sum of the refractive indices of the layers of the green light-emitting structure in the thickness direction, n 2xy is the sum of the refractive indices of the layers of the green light-emitting structure in the vertical thickness direction, n 3z is the sum of the refractive indices of the layers of the blue light-emitting structure in the thickness direction, n 3xy is the sum of the refractive indices of the layers of the blue light emitting structure in the vertical thickness direction. According to the embodiments of the present invention, the reflectivity of the interface between the blue light emitting structure and the outside world under a wide viewing angle can be reduced, the transmittance can be increased, the brightness can be improved, and the color deviation can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display equipment, and in particular to a display device and a display panel thereof, and an OLED display device. Background Art

[0002] Compared with the widely used liquid crystal and plasma displays, organic light-emitting diode (OLED) devices have attracted much attention due to their self-luminescence, rich colors, fast response speed, wide viewing angle, light weight, thin thickness, low power consumption, and flexible display.

[0003] However, in the related art, when viewing an OLED screen at different viewing angles, such as at a wide viewing angle, the color of the screen changes greatly, that is, there is a serious color cast problem. For example, white light at a normal viewing angle may appear yellowish at an 80-degree viewing angle.

[0004] Color shift in viewing angle is one of the important evaluation indicators of OLED products. The existing products have to take into account various factors such as lifespan, efficiency, and color gamut, so it is difficult to improve the problem of large color shift in viewing angle. Summary of the invention

[0005] The present invention provides a display device and a display panel thereof, and an OLED display device to solve the deficiencies in the related art.

[0006] To achieve the above object, a first aspect of an embodiment of the present invention provides an OLED display device, comprising: a red light emitting structure, a green light emitting structure and a blue light emitting structure, (n 3z -n 3xy )-(n 1z -n 1xy )≥ the first preset value, (n 3z -n 3xy )-(n 2z -n 2xy )≥ the second preset value, the range of the first preset value and the second preset value are both 0.1 to 0.3; wherein, n 1z is the sum of the refractive indices of the layers of the red light emitting structure in the thickness direction, n 1xy is the sum of the refractive indices of the layers of the red light emitting structure in the vertical thickness direction, n 2z is the sum of the refractive indices of the layers of the green light emitting structure in the thickness direction, n 2xy is the sum of the refractive indices of the layers of the green light emitting structure in the vertical thickness direction, n 3z is the sum of the refractive indices of the layers of the blue light-emitting structure in the thickness direction, n 3xy It is the sum of the refractive indices of the layers of the blue light-emitting structure in the direction perpendicular to the thickness.

[0007] Optionally, each layer of the red light-emitting structure includes a first anode, a first cathode, and a red OLED light-emitting block between the first anode and the first cathode; each layer of the green light-emitting structure includes a second anode, a second cathode, and a green OLED light-emitting block between the second anode and the second cathode; each layer of the blue light-emitting structure includes a third anode, a third cathode, and a blue OLED light-emitting block between the third anode and the third cathode.

[0008] Optionally, the first anode, the second anode and the third anode are located in the same layer and are disconnected in pairs, and the first cathode, the second cathode and the third cathode are located in the same layer and are connected together;

[0009] (n 31z -n 31xy )-(n 11z -n 11xy )≥the first preset value, (n 31z -n 31xy )-(n 21z -n 21xy )≥ the second preset value; wherein, n 11z is the refractive index of the first anode in the thickness direction, n 11xy is the refractive index of the first anode in the direction perpendicular to the thickness, n 21z is the refractive index of the second anode in the thickness direction, n 21xy is the refractive index of the second anode in the direction perpendicular to the thickness, n 31z is the refractive index of the third anode in the thickness direction, n 31xy is the refractive index of the third anode in the direction perpendicular to the thickness; and / or

[0010] (n 32z -n 32xy )-(n 12z -n 12xy )≥the first preset value, (n 32z -n 32xy )-(n 22z -n 22xy )≥ the second preset value; wherein, n 12z is the refractive index of the red OLED light-emitting block in the thickness direction, n 12xy is the refractive index of the red OLED light-emitting block in the vertical thickness direction, n 22z is the refractive index of the green OLED light-emitting block in the thickness direction, n 22xy is the refractive index of the green OLED light-emitting block in the vertical thickness direction, n 32z is the refractive index of the blue OLED light-emitting block in the thickness direction, n32xy is the refractive index of the blue OLED light-emitting block in the vertical thickness direction.

[0011] Optionally, each layer of the red light-emitting structure further includes at least one of a first hole transport layer, a first electron blocking layer, a first hole blocking layer and a first electron transport layer; the first hole transport layer and the first electron blocking layer are located between the first anode and the red OLED light-emitting block, the first hole transport layer is close to the first anode, and the first electron blocking layer is far away from the first anode; the first hole blocking layer and the first electron transport layer are located between the first cathode and the red OLED light-emitting block, the first hole blocking layer is far away from the first cathode, and the first electron transport layer is close to the first cathode;

[0012] Each layer of the green light-emitting structure further includes at least one of a second hole transport layer, a second electron blocking layer, a second hole blocking layer and a second electron transport layer; the second hole transport layer and the second electron blocking layer are located between the second anode and the green OLED light-emitting block, the second hole transport layer is close to the second anode, and the second electron blocking layer is far away from the second anode; the second hole blocking layer and the second electron transport layer are located between the second cathode and the green OLED light-emitting block, the second hole blocking layer is far away from the second cathode, and the second electron transport layer is close to the second cathode;

[0013] Each layer of the blue light-emitting structure further includes a third hole transport layer, a third electron blocking layer, and at least one of a third hole blocking layer and a third electron transport layer; the third hole transport layer and the third electron blocking layer are located between the third anode and the blue OLED light-emitting block, the third hole transport layer is close to the third anode, and the third electron blocking layer is far away from the third anode; the third hole blocking layer and the third electron transport layer are located between the third cathode and the blue OLED light-emitting block, the third hole blocking layer is far away from the third cathode, and the third electron transport layer is close to the third cathode.

[0014] Optionally, the first hole transport layer, the second hole transport layer and the third hole transport layer are located in the same layer and are disconnected from each other; (n 33z -n 33xy )-(n 13z -n 13xy )≥the first preset value, (n 33z -n 33xy )-(n 23z -n 23xy )≥ the second preset value; wherein, n 13z is the refractive index of the first hole transport layer in the thickness direction, n13xy is the refractive index of the first hole transport layer in the direction perpendicular to the thickness, n 23z is the refractive index of the second hole transport layer in the thickness direction, n 23xy is the refractive index of the second hole transport layer in the direction perpendicular to the thickness, n 33z is the refractive index of the third hole transport layer in the thickness direction, n 33xy is the refractive index of the third hole transport layer in the direction perpendicular to the thickness; and / or

[0015] The first electron blocking layer, the second electron blocking layer and the third electron blocking layer are located in the same layer and are disconnected in pairs; (n 34z -n 34xy )-(n 14z -n 14xy )≥the first preset value, (n 34z -n 34xy )-(n 24z -n 24xy )≥ the second preset value; wherein, n 14z is the refractive index of the first electron blocking layer in the thickness direction, n 14xy is the refractive index of the first electron blocking layer in the direction perpendicular to the thickness, n 24z is the refractive index of the second electron blocking layer in the thickness direction, n 24xy is the refractive index of the second electron blocking layer in the direction perpendicular to the thickness, n 34z is the refractive index of the third electron blocking layer in the thickness direction, n 34xy is the refractive index of the third electron blocking layer in the vertical thickness direction; and / or

[0016] The first hole blocking layer, the second hole blocking layer and the third hole blocking layer are located in the same layer and are disconnected from each other; (n 35z -n 35xy )-(n 15z -n 15xy )≥the first preset value, (n 35z -n 35xy )-(n 25z -n 25xy )≥ the second preset value; wherein, n 15z is the refractive index of the first hole blocking layer in the thickness direction, n 15xy is the refractive index of the first hole blocking layer in the vertical thickness direction, n 25z is the refractive index of the second hole blocking layer in the thickness direction, n 25xy is the refractive index of the second hole blocking layer in the direction perpendicular to the thickness, n 35zis the refractive index of the third hole blocking layer in the thickness direction, n 35xy is the refractive index of the third hole blocking layer in the vertical thickness direction; and / or

[0017] The first electron transport layer, the second electron transport layer and the third electron transport layer are located in the same layer and are disconnected from each other; (n 36z -n 36xy )-(n 16z -n 16xy )≥the first preset value, (n 36z -n 36xy )-(n 26z -n 26xy )≥ the second preset value; wherein, n 16z is the refractive index of the first electron transport layer in the thickness direction, n 16xy is the refractive index of the first electron transport layer in the direction perpendicular to the thickness, n 26z is the refractive index of the second electron transport layer in the thickness direction, n 26xy is the refractive index of the second electron transport layer in the direction perpendicular to the thickness, n 36z is the refractive index of the third electron transport layer in the thickness direction, n 36xy is the refractive index of the third electron transport layer in the direction perpendicular to the thickness.

[0018] Optionally, each layer of the red light-emitting structure further includes a first light extraction layer, which is located on a side of the first cathode away from the red OLED light-emitting block; each layer of the green light-emitting structure further includes a second light extraction layer, which is located on a side of the second cathode away from the green OLED light-emitting block; each layer of the blue light-emitting structure further includes a third light extraction layer, which is located on a side of the third cathode away from the blue OLED light-emitting block.

[0019] Optionally, the first light extraction layer, the second light extraction layer and the third light extraction layer are located in the same layer and are disconnected from each other; (n 37z -n 37xy )-(n 17z -n 17xy )≥the first preset value, (n 37z -n 37xy )-(n 27z -n 27xy )≥ the second preset value; wherein, n 17z is the refractive index of the first light extraction layer in the thickness direction, n 17xy is the refractive index of the first light extraction layer in the direction perpendicular to the thickness, n 27z is the refractive index of the second light extraction layer in the thickness direction, n27xy is the refractive index of the second light extraction layer in the direction perpendicular to the thickness, n 37z is the refractive index of the third light extraction layer in the thickness direction, n 37xy is the refractive index of the third light extraction layer in the direction perpendicular to the thickness.

[0020] Optionally, n 1z =n 1xy , and / or n 2z =n 2xy .

[0021] Optionally, n 3z -n 3xy ≥ the third preset value, n 1z -n 1xy ≤ fourth preset value, the third preset value - the fourth preset value = the first preset value; n 2z -n 2xy ≤fifth preset value, the third preset value-the fifth preset value=the second preset value.

[0022] Optionally, n 1x =n 2y , and / or n 2x =n 2y , and / or n 3x =n 3y ; where n 1x is the sum of the refractive indices of the layers of the red light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 1y is the sum of the refractive indices of the layers of the red light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 3x is the sum of the refractive indices of the layers of the blue light-emitting structure in the first direction within the plane perpendicular to the thickness, n 3y It is the sum of the refractive indices of the layers of the blue light-emitting structure in a second direction within a plane perpendicular to the thickness, and the first direction is perpendicular to the second direction.

[0023] Optionally, (n 3x -n 3y )-(n 1x -n 1y )≥ the sixth preset value, (n 3x -n 3y )-(n 2x -n 2y)≥ the seventh preset value, the range of the sixth preset value and the seventh preset value are both 0.1 to 0.3; wherein, n 1x is the sum of the refractive indices of the layers of the red light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 1y is the sum of the refractive indices of the layers of the red light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 3x is the sum of the refractive indices of the layers of the blue light-emitting structure in the first direction within the plane perpendicular to the thickness, n 3y It is the sum of the refractive indices of the layers of the blue light-emitting structure in a second direction within a plane perpendicular to the thickness, and the first direction is perpendicular to the second direction.

[0024] Optionally, (n 3y -n 3x )-(n 1y -n 1x )≥ the sixth preset value, (n 3y -n 3x )-(n 2y -n 2x )≥ the seventh preset value, the range of the sixth preset value and the seventh preset value are both 0.1 to 0.3; wherein, n 1x is the sum of the refractive indices of the layers of the red light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 1y is the sum of the refractive indices of the layers of the red light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 3x is the sum of the refractive indices of the layers of the blue light-emitting structure in the first direction within the plane perpendicular to the thickness, n 3y It is the sum of the refractive indices of the layers of the blue light-emitting structure in a second direction within a plane perpendicular to the thickness, and the first direction is perpendicular to the second direction.

[0025] A second aspect of the embodiments of the present invention provides a display panel, comprising: any one of the above-mentioned OLED display devices, wherein the OLED display devices are arranged in an array.

[0026] Optionally, the OLED display device is a bottom-emitting structure or a top-emitting structure.

[0027] A third aspect of the embodiments of the present invention provides a display device, comprising: a display panel as described in any one of the above items.

[0028] The inventors analyzed the color cast problem in the related art and found that the reason is that the brightness of the blue light-emitting structure decays faster than that of the red light-emitting structure and the green light-emitting structure as the viewing angle increases.

[0029] Based on the above analysis, in the above embodiments of the present invention, by controlling the refractive index anisotropy of each layer of the red light emitting structure, the green light emitting structure and the blue light emitting structure in the thickness direction and the perpendicular thickness direction, (n 3z -n 3xy )-(n 1z -n 1xy )≥ the first preset value, (n 3z -n 3xy )-(n 2z -n 2xy )≥ the second preset value, the range of the first preset value and the second preset value are both 0.1 to 0.3; wherein, n 1z is the sum of the refractive indices of the layers of the red light-emitting structure in the thickness direction, n 1xy is the sum of the refractive indices of the layers of the red light-emitting structure in the vertical thickness direction, n 2z is the sum of the refractive indices of the layers of the green light-emitting structure in the thickness direction, n 2xy is the sum of the refractive indices of the layers of the green light-emitting structure in the vertical thickness direction, n 3z is the sum of the refractive indices of the layers of the blue light-emitting structure in the thickness direction, n 3xy It is the sum of the refractive indices of the layers of the blue light-emitting structure in the direction perpendicular to the thickness; thereby reducing the reflectivity of the interface between the blue light-emitting structure and the outside world at a large viewing angle, increasing the transmittance, improving the brightness, and thus improving the color deviation.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1 is a top view of an OLED display device according to a first embodiment of the present invention;

[0033] Figure 2 It is along Figure 1The cross-sectional view of line AA in the figure;

[0034] Figure 3 is a graph showing the color shift of the blue light emitting structure in the related art and the blue light emitting structure of the present embodiment as the viewing angle deviates from the normal viewing direction in the horizontal direction when emitting white light;

[0035] Figure 4 is a graph showing the ratio of the actual brightness to the required brightness of the blue light emitting structure in the related art and the blue light emitting structure of the present embodiment as the viewing angle deviates from the normal viewing in the X direction;

[0036] Figure 5 is a schematic cross-sectional structural diagram of an OLED display device according to a second embodiment of the present invention;

[0037] Figure 6 FIG. 4 is a schematic cross-sectional structural diagram of an OLED display device according to a third embodiment of the present invention.

[0038] List of reference numerals:

[0039] OLED display device 1, 2, 3 substrate 10

[0040] Red light emitting structure 11 Green light emitting structure 12

[0041] Blue light emitting structure 13 First anode 111

[0042] First cathode 112 Red OLED light emitting block 113

[0043] The second anode 121 and the second cathode 122

[0044] Green OLED light-emitting block 123 Third anode 131

[0045] The third cathode 132 blue OLED light-emitting block 133

[0046] The first hole transport layer HTL1 and the first electron blocking layer EBL1

[0047] First hole blocking layer HBL1 First electron transport layer ETL1

[0048] The second hole transport layer HTL2 The second electron blocking layer EBL2

[0049] Second hole blocking layer HBL2 Second electron transport layer ETL2

[0050] The third hole transport layer HTL3 The third electron blocking layer EBL3

[0051] The third hole blocking layer HBL3 The third electron transport layer ETL3

[0052] First light extraction layer CPL1 Second light extraction layer CPL2

[0053] The third light extraction layer CPL3 DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0055] Figure 1 is a top view of an OLED display device according to a first embodiment of the present invention; Figure 2 It is along Figure 1 Sectional view along line AA.

[0056] Reference Figure 1 and Figure 2 As shown, the OLED display device 1 includes: a red light emitting structure 11, a green light emitting structure 12 and a blue light emitting structure 13, (n 3z -n 3xy )-(n 1z -n 1xy )≥ the first preset value, (n 3z -n 3xy )-(n 2z -n 2xy )≥ the second preset value, the range of the first preset value and the second preset value are both 0.1 to 0.3; wherein, n 1z is the sum of the refractive indices of the layers of the red light emitting structure 11 in the thickness direction, n 1xy is the sum of the refractive indices of the layers of the red light emitting structure 11 in the vertical thickness direction, n 2z is the sum of the refractive indices of the layers of the green light emitting structure 12 in the thickness direction, n 2xy is the sum of the refractive indices of the layers of the green light emitting structure 12 in the vertical thickness direction, n 3z is the sum of the refractive indices of the layers of the blue light emitting structure 13 in the thickness direction, n 3xy It is the sum of the refractive indices of the layers of the blue light emitting structure 13 in the vertical thickness direction.

[0057] Reference Figure 2 As shown, the OLED display device 1 can be arranged on a substrate 10. The substrate 10 can be a flexible substrate or a hard substrate. The material of the flexible substrate can be polyimide, and the material of the hard substrate can be glass.

[0058] In this embodiment, refer to Figure 2 As shown, the red light emitting structure 11 may include a first anode 111 , a first cathode 112 , and a red OLED light emitting block 113 located between the first anode 111 and the first cathode 112 .

[0059] The green light emitting structure 12 may include a second anode 121 , a second cathode 122 , and a green OLED light emitting block 123 located between the second anode 121 and the second cathode 122 .

[0060] The blue light emitting structure 13 may include a third anode 131 , a third cathode 132 , and a blue OLED light emitting block 133 located between the third anode 131 and the third cathode 132 .

[0061] In this embodiment, the first anode 111, the second anode 121 and the third anode 131 are close to the substrate 10, and the first cathode 112, the second cathode 122 and the third cathode 132 are far away from the substrate 10. A pixel definition layer (not shown) may be provided on the first anode 111, the second anode 121, the third anode 131 and the substrate 10 where the first anode 111, the second anode 121 and the third anode 131 are not provided. The pixel definition layer has a plurality of openings, and each opening corresponds to exposing a partial area of ​​the first anode 111, the second anode 121 and the third anode 131. The red OLED light-emitting block 113, the green OLED light-emitting block 123 and the blue OLED light-emitting block 133 are respectively located in the corresponding openings. The first cathode 112, the second cathode 122 and the third cathode 132 are correspondingly located on the red OLED light-emitting block 113, the green OLED light-emitting block 123, the blue OLED light-emitting block 133 and the pixel definition layer.

[0062] Reference Figure 2 As shown, in this embodiment, the red light emitting structure 11, the green light emitting structure 12 and the blue light emitting structure 13 each form a Fabry-Perot resonant cavity.

[0063] According to the principle of the Fabry-Perot resonant cavity, a resonant cavity is formed by two parallel plates with high reflectivity. When the frequency of the incident light in the resonant cavity meets the resonance condition of the resonant cavity, a very high peak value will appear in the transmission spectrum, corresponding to a very high transmittance. Therefore, the resonant cavity with predetermined characteristics can allow the corresponding wavelength of light to pass through. Therefore, there is a corresponding relationship between the cavity length of the Fabry-Perot resonant cavity and the wavelength of light. Microcavity structures with different cavity lengths can only transmit light of specific wavelengths.

[0064] When light is reflected back and forth in the Fabry-Perot resonant cavity, it is also transmitted and reflected at the interface of adjacent layers in the cavity. In addition, light is also transmitted and reflected at the exit light interface of the resonant cavity.

[0065] Interface reflectivity where N1 and N2 are the refractive indices of the media on both sides of the interface respectively, and θ is the reflection angle.

[0066] In an optional solution, when the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure 13 are viewed from the front, θ is 0 degree, N1 = N1z, and N2 = N2z; where N1z and N2z are the refractive indices of the media on both sides of the interface in the thickness direction respectively;

[0067] At a large viewing angle, for the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure in the related art, N1≈N1xy = N1z, and N2≈N2xy = N2z; for the blue light-emitting structure 13 of this embodiment, N1≈N1xy = N1z, and N2≈N2xy < N2z. Where N1xy and N2xy are the refractive indices of the media on both sides of the interface in the direction perpendicular to the thickness direction respectively. In this embodiment, the refractive index of the medium in the direction perpendicular to the thickness direction refers to the refractive index of the medium in any direction within the plane where the thickness direction is located.

[0068] In other words, the refractive indices of each layer in the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure in the related art are isotropic in the thickness direction and the direction perpendicular to the thickness direction. The refractive indices of each layer in the blue light-emitting structure 13 of this embodiment are anisotropic in the thickness direction and the direction perpendicular to the thickness direction.

[0069] For the same large viewing angle θ, the reflectivity R1 of the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure in the related art on the interface is:

[0070]

[0071] The reflectivity R2 of the blue light-emitting structure 13 of this embodiment on the interface is:

[0072]

[0073] It can be seen that N2xy < N2z will result in R2 < R1.

[0074] To verify the above conclusion, at a large viewing angle, for the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure in the related art, N1≈N1xy = N1z = 1 (corresponding to the refractive index of the external air), and N2≈N2xy = N2z = 1.8; for the blue light-emitting structure 13 of this embodiment, N1≈N1xy = N1z = 1 (corresponding to the refractive index of the external air), and N2≈N2xy = 1.7. It can be obtained that R2 < R1.

[0075] R2<R1 will cause the transmittance of the blue light-emitting structure 13 of this embodiment to be greater than the transmittance of the red light-emitting structure 11, the green light-emitting structure 12 and the blue light-emitting structure in the related technology, thereby improving the brightness of the blue light-emitting structure 13 of this embodiment at a wide viewing angle and improving color deviation.

[0076] To verify the above beneficial effects, Figure 3 is a graph showing the color shift of the blue light emitting structure in the related art and the blue light emitting structure 13 of the present embodiment as the viewing angle deviates from the normal viewing direction in the horizontal direction when emitting white light; Figure 4 It is a curve diagram showing the ratio of the actual brightness to the required brightness of the blue light emitting structure in the related art and the blue light emitting structure 13 of this embodiment as the viewing angle deviates from the normal viewing in the X direction.

[0077] Reference Figure 3 As shown, at a wide viewing angle, the color deviation of the blue light emitting structure 13 of the present embodiment is smaller than that of the blue light emitting structure in the related art.

[0078] Reference Figure 4 As shown, at a wide viewing angle, the ratio of the actual brightness to the required brightness of the blue light emitting structure 13 of this embodiment is greater than the ratio of the actual brightness to the required brightness of the blue light emitting structure in the related art.

[0079] First, the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure 13 constituting the resonant cavity have multiple layers, that is, multiple interfaces. Second, the color shift is relative between the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure 13. Third, the luminous efficiency distribution of the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure 13 under normal viewing and wide viewing angles is taken into account. Considering the above three factors, the refractive index of each layer of the red light-emitting structure 11, the green light-emitting structure 12, and the blue light-emitting structure 13 in the thickness direction and the perpendicular thickness direction is set to: (n 3z -n 3xy )-(n 1z -n 1xy )≥ the first preset value, (n 3z -n 3xy )-(n 2z -n 2xy )≥ the second preset value, the range of the first preset value and the second preset value are both 0.1 to 0.3; wherein, n 1z is the sum of the refractive indices of the layers of the red light emitting structure 11 in the thickness direction, n 1xy is the sum of the refractive indices of the layers of the red light emitting structure 11 in the vertical thickness direction, n 2z is the sum of the refractive indices of the layers of the green light emitting structure 12 in the thickness direction, n 2xyis the sum of the refractive indices of the layers of the green light emitting structure 12 in the vertical thickness direction, n 3z is the sum of the refractive indices of the layers of the blue light emitting structure 13 in the thickness direction, n 3xy It is the sum of the refractive indices of the layers of the blue light emitting structure 13 in the vertical thickness direction.

[0080] The numerical ranges in this embodiment include the endpoint values.

[0081] In some embodiments, n 1z =n 1xy , and / or n 2z =n 2xy Correspondingly, n 3z -n 3xy ≥ first preset value, and / or n 3z -n 3xy ≥ Second preset value.

[0082] In some other embodiments, n 3z -n 3xy ≥ the third preset value, n 1z -n 1xy ≤ fourth preset value, third preset value - fourth preset value = first preset value; n 2z -n 2xy ≤fifth preset value, third preset value-fifth preset value=second preset value.

[0083] In addition, in this embodiment, n 1x =n 1y , and / or n 2x =n 2y , and / or n 3x =n 3y .

[0084] In this embodiment, refer to Figure 2 As shown, the first anode 111, the second anode 121 and the third anode 131 are located in the same layer and are disconnected in pairs, and the first cathode 112, the second cathode 122 and the third cathode 132 are located in the same layer and are connected together;

[0085] (n 31z -n 31xy )-(n 11z -n 11xy )≥ the first preset value, (n 31z -n 31xy )-(n 21z -n 21xy )≥ the second preset value; wherein, n 11z is the refractive index of the first anode 111 in the thickness direction, n 11xy is the refractive index of the first anode 111 in the direction perpendicular to the thickness, n 21zis the refractive index of the second anode 121 in the thickness direction, n 21xy is the refractive index of the second anode 121 in the direction perpendicular to the thickness, n 31z is the refractive index of the third anode 131 in the thickness direction, n 31xy is the refractive index of the third anode 131 in the direction perpendicular to the thickness; and / or

[0086] (n 32z -n 32xy )-(n 12z -n 12xy )≥ the first preset value, (n 32z -n 32xy )-(n 22z -n 22xy )≥ the second preset value; wherein, n 12z is the refractive index of the red OLED light-emitting block 113 in the thickness direction, n 12xy is the refractive index of the red OLED light-emitting block 113 in the vertical thickness direction, n 22z is the refractive index of the green OLED light-emitting block 123 in the thickness direction, n 22xy is the refractive index of the green OLED light-emitting block 123 in the vertical thickness direction, n 32z is the refractive index of the blue OLED light-emitting block 133 in the thickness direction, n 32xy is the refractive index of the blue OLED light-emitting block 133 in the vertical thickness direction.

[0087] The refractive index anisotropy of the first anode 111, the second anode 121, and the third anode 131, as well as the red OLED light-emitting block 113, the green OLED light-emitting block 123, and the blue OLED light-emitting block 133 in the thickness direction and the direction perpendicular to the thickness can be achieved through material selection on the one hand, and process control on the other hand. For example, in the deposition process, the temperature of different regions on the substrate can be controlled to be different, so as to achieve the refractive index anisotropy of the first anode 111, the second anode 121, and the third anode 131 in the thickness direction and the direction perpendicular to the thickness.

[0088] Figure 5 FIG. 2 is a schematic cross-sectional view of an OLED display device according to a second embodiment of the present invention. Figure 5As shown, the OLED display device 2 of the present embodiment is substantially the same as the OLED display device 1 of the first embodiment, and the only difference is that: each layer of the red light emitting structure 11 further includes at least one of a first hole transport layer HTL1, a first electron blocking layer EBL1, a first hole blocking layer HBL1 and a first electron transport layer ETL1; the first hole transport layer HTL1 and the first electron blocking layer EBL1 are located between the first anode 111 and the red OLED light emitting block 113, the first hole transport layer HTL1 is close to the first anode 111, and the first electron blocking layer EBL1 is far away from the first anode 111; the first hole blocking layer HBL1 and the first electron transport layer ETL1 are located between the first cathode 112 and the red OLED light emitting block 113, the first hole blocking layer HBL1 is far away from the first cathode 112, and the first electron transport layer ETL1 is close to the first cathode 112;

[0089] Each layer of the green light emitting structure 12 further includes at least one of a second hole transport layer HTL2, a second electron blocking layer EBL2, a second hole blocking layer HBL2 and a second electron transport layer ETL2; the second hole transport layer HTL2 and the second electron blocking layer EBL2 are located between the second anode 121 and the green OLED light emitting block 123, the second hole transport layer HTL2 is close to the second anode 121, and the second electron blocking layer EBL2 is far away from the second anode 121; the second hole blocking layer HBL2 and the second electron transport layer ETL2 are located between the second cathode 122 and the green OLED light emitting block 123, the second hole blocking layer HBL2 is far away from the second cathode 122, and the second electron transport layer ETL2 is close to the second cathode 122;

[0090] The layers of the blue light-emitting structure 13 also include at least one of a third hole transport layer HTL3, a third electron blocking layer EBL3, and a third hole blocking layer HBL3 and a third electron transport layer ETL3; the third hole transport layer HTL3 and the third electron blocking layer EBL3 are located between the third anode 131 and the blue OLED light-emitting block 133, the third hole transport layer HTL3 is close to the third anode 131, and the third electron blocking layer EBL3 is far away from the third anode 131; the third hole blocking layer HBL3 and the third electron transport layer ETL3 are located between the third cathode 132 and the blue OLED light-emitting block 133, the third hole blocking layer HBL3 is far away from the third cathode 132, and the third electron transport layer ETL is close to the third cathode 132.

[0091] The first hole transport layer HTL1, the second hole transport layer HTL2 and the third hole transport layer HTL3 are located in the same layer and are disconnected from each other; (n 33z -n 33xy )-(n 13z -n 13xy )≥ the first preset value, (n 33z -n33xy )-(n 23z -n 23xy )≥ the second preset value; wherein, n 13z is the refractive index of the first hole transport layer HTL1 in the thickness direction, n 13xy is the refractive index of the first hole transport layer HTL1 in the vertical thickness direction, n 23z is the refractive index of the second hole transport layer HTL2 in the thickness direction, n 23xy is the refractive index of the second hole transport layer HTL2 in the vertical thickness direction, n 33z is the refractive index of the third hole transport layer HTL3 in the thickness direction, n 33xy is the refractive index of the third hole transport layer HTL3 in the vertical thickness direction; and / or

[0092] The first electron blocking layer EBL1, the second electron blocking layer EBL2 and the third electron blocking layer EBL3 are located in the same layer and are disconnected in pairs; (n 34z -n 34xy )-(n 14z -n 14xy )≥ the first preset value, (n 34z -n 34xy )-(n 24z -n 24xy )≥ the second preset value; wherein, n 14z is the refractive index of the first electron blocking layer EBL1 in the thickness direction, n 14xy is the refractive index of the first electron blocking layer EBL1 in the vertical thickness direction, n 24z is the refractive index of the second electron blocking layer EBL2 in the thickness direction, n 24xy is the refractive index of the second electron blocking layer EBL2 in the vertical thickness direction, n 34z is the refractive index of the third electron blocking layer EBL3 in the thickness direction, n 34xy is the refractive index of the third electron blocking layer EBL3 in the vertical thickness direction; and / or

[0093] The first hole blocking layer HBL1, the second hole blocking layer HBL2 and the third hole blocking layer HBL3 are located in the same layer and are disconnected from each other; (n 35z -n 35xy )-(n 15z -n 15xy )≥ the first preset value, (n 35z -n 35xy )-(n 25z -n 25xy )≥ the second preset value; wherein, n 15z is the refractive index of the first hole blocking layer HBL1 in the thickness direction, n 15xyis the refractive index of the first hole blocking layer HBL1 in the vertical thickness direction, n 25z is the refractive index of the second hole blocking layer HBL2 in the thickness direction, n 25xy is the refractive index of the second hole blocking layer HBL2 in the vertical thickness direction, n 35z is the refractive index of the third hole blocking layer HBL3 in the thickness direction, n 35xy is the refractive index of the third hole blocking layer HBL3 in the vertical thickness direction; and / or

[0094] The first electron transport layer ETL1, the second electron transport layer ETL2 and the third electron transport layer ETL3 are located in the same layer and are disconnected in pairs; (n 36z -n 36xy )-(n 16z -n 16xy )≥ the first preset value, (n 36z -n 36xy )-(n 26z -n 26xy )≥ the second preset value; wherein, n 16z is the refractive index of the first electron transport layer ETL1 in the thickness direction, n 16xy is the refractive index of the first electron transport layer ETL1 in the vertical thickness direction, n 26z is the refractive index of the second electron transport layer ETL2 in the thickness direction, n 26xy is the refractive index of the second electron transport layer ETL2 in the vertical thickness direction, n 36z is the refractive index of the third electron transport layer ETL3 in the thickness direction, n 36xy is the refractive index of the third electron transport layer ETL3 in the vertical thickness direction.

[0095] The refractive index anisotropy of the above layers in the thickness direction and the perpendicular thickness direction can be achieved through material selection on the one hand and process control on the other hand. For example, T2T has a refractive index of 1.83 in the thickness direction and a refractive index of 1.67 in the perpendicular thickness direction, and can be selected as the third hole transport layer HTL3.

[0096] In this embodiment, it is preferred that the film layer close to the OLED light-emitting block has anisotropy of refractive index in the thickness direction and in the direction perpendicular to the thickness direction.

[0097] In other embodiments, other film layers with anisotropic refractive index may be disposed between the first anode 111 and the first cathode 112 , and / or between the second anode 121 and the second cathode 122 , and / or between the third anode 131 and the third cathode 132 .

[0098] Figure 6 FIG. 1 is a schematic cross-sectional view of an OLED display device according to a third embodiment of the present invention. Figure 6 As shown, the OLED display device 3 of this embodiment is substantially the same as the OLED display device 2 of the second embodiment, and the difference is only in that:

[0099] The layers of the red light-emitting structure 11 also include a first light extraction layer CPL1, which is located on a side of the first cathode 112 away from the red OLED light-emitting block 113; the layers of the green light-emitting structure 12 also include a second light extraction layer CPL2, which is located on a side of the second cathode 122 away from the green OLED light-emitting block 123; the layers of the blue light-emitting structure 13 also include a third light extraction layer CPL3, which is located on a side of the third cathode 132 away from the blue OLED light-emitting block 133.

[0100] The first light extraction layer CPL1, the second light extraction layer CPL2 and the third light extraction layer CPL3 may be located in the same layer and disconnected from each other; (n 37z -n 37xy )-(n 17z -n 17xy )≥ the first preset value, (n 37z -n 37xy )-(n 27z -n 27xy )≥ the second preset value; wherein, n 17z is the refractive index of the first light extraction layer CPL1 in the thickness direction, n 17xy is the refractive index of the first light extraction layer CPL1 in the vertical thickness direction, n 27z is the refractive index of the second light extraction layer CPL2 in the thickness direction, n 27xy is the refractive index of the second light extraction layer CPL2 in the vertical thickness direction, n 37z is the refractive index of the third light extraction layer CPL3 in the thickness direction, n 37xy is the refractive index of the third light extraction layer CPL3 in the vertical thickness direction.

[0101] The fourth embodiment of the present invention further provides an OLED display device. The OLED display device of the fourth embodiment of the present invention is substantially the same as the OLED display devices 1, 2, and 3 of the first to third embodiments, except that: 3x -n 3y )-(n 1x -n 1y )≥ the sixth preset value, (n 3x -n 3y )-(n 2x -n 2y )≥ the seventh preset value, the range of the sixth preset value and the seventh preset value are both 0.1 to 0.3; wherein, n 1xis the sum of the refractive indices of the layers of the red light emitting structure 11 in the first direction in the plane perpendicular to the thickness direction, n 1y is the sum of the refractive indices of the layers of the red light emitting structure 11 in the second direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure 12 in the first direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure 12 in the second direction in the plane perpendicular to the thickness direction, n 3x is the sum of the refractive indices of the layers of the blue light emitting structure 13 in the first direction within the plane perpendicular to the thickness, n 3y It is the sum of the refractive indices of the layers of the blue light emitting structure 13 in the second direction within the plane where the vertical thickness is located, and the first direction is perpendicular to the second direction.

[0102] The numerical ranges in this embodiment include the endpoint values.

[0103] It can be seen that the OLED display device of this embodiment is different from the OLED display devices 1, 2, and 3 of the aforementioned embodiments in that: 3x ≠n 3y .

[0104] The solution of this embodiment can adjust the problem that the color deviation in the Y direction is greater than the color deviation in the X direction under a wide viewing angle, and can solve the problem that the Y direction is more yellow than the X direction under a wide viewing angle.

[0105] When the X direction is more yellow than the Y direction at a large viewing angle, you can control: (n 3y -n 3x )-(n 1y -n 1x )≥ the sixth preset value, (n 3y -n 3x )-(n 2y -n 2x )≥ the seventh preset value.

[0106] Based on the above-mentioned OLED display devices, the fifth embodiment of the present invention further provides a display panel in which the OLED display devices are arranged in an array.

[0107] In some embodiments, a planarization layer (not shown) is disposed between the substrate 10 and the OLED display device.

[0108] In some embodiments, a pixel driving circuit is further disposed between the substrate 10 and the planarization layer. In other words, the light emitting mode of the red light emitting structure 11, the green light emitting structure 12 and the blue light emitting structure 13 is active matrix (AM).

[0109] In some embodiments, the red light emitting structure 11 , the green light emitting structure 12 , and the blue light emitting structure 13 emit light in a passively driven manner (Passive Matrix, PM). In this case, there is no pixel driving circuit between the substrate 10 and the planarization layer.

[0110] The material of the first anode 111, the second anode 121, and the third anode 131 may be a reflective material. The reflective material may include silver (Ag) and its alloys, aluminum (Al) and its alloys, such as silver (Ag), an alloy of silver and lead (Ag:Pb), an alloy of aluminum and neodymium (Al:Nd), an alloy of silver, platinum and copper (Ag:Pt:Cu), etc. When silver and its alloys are used as the reflective material, a layer of ITO, IZO, or IGZO may be disposed between the first anode 111, the second anode 121, and the third anode 131 and the OLED light-emitting block, respectively.

[0111] The material of the first cathode 112, the second cathode 122 and the third cathode 132 may be a material having a partially light-transmitting and partially light-reflecting function (semi-transmitting and semi-reflecting material). The first cathode 112, the second cathode 122 and the third cathode 132 may be a single-layer structure, and the material of the single-layer structure may include: at least one of magnesium, silver, and aluminum, for example: a mixture of magnesium and silver or a mixture of aluminum and silver. The first cathode 112, the second cathode 122 and the third cathode 132 may also be a three-layer structure of a transparent conductive layer, an intermediate layer, and a transparent conductive layer. The material of the transparent conductive layer may be at least one of ITO, IZO and IGZO, and the material of the intermediate layer may include: at least one of magnesium, silver, and aluminum, for example: a mixture of magnesium and silver or a mixture of aluminum and silver. In other words, the red light-emitting structure 11, the green light-emitting structure 12 and the blue light-emitting structure 13 are top light-emitting structures.

[0112] In some embodiments, the red light emitting structure 11 , the green light emitting structure 12 and the blue light emitting structure 13 may also be bottom light emitting structures.

[0113] Based on the above display panel, an embodiment of the present invention further provides a display device including any of the above display panels. The display device can be any product or component with display function, such as electronic paper, mobile phone, tablet computer, television, notebook computer, digital photo frame, navigator, etc.

[0114] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0115] In the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The term "several" refers to one, two or more than two, unless otherwise clearly defined.

[0116] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0117] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An OLED display device, characterized in that: include: Red light emitting structure, green light emitting structure and blue light emitting structure, (n 3z -n 3xy )-(n 1z -n 1xy )≥ the first preset value, (n 3z -n 3xy )-(n 2z -n 2xy )≥ the second preset value, the range of the first preset value and the second preset value are both 0.1 to 0.3; wherein, n 1z is the sum of the refractive indices of the layers of the red light emitting structure in the thickness direction, n 1xy is the sum of the refractive indices of the layers of the red light emitting structure in the vertical thickness direction, n 2z is the sum of the refractive indices of the layers of the green light emitting structure in the thickness direction, n 2xy is the sum of the refractive indices of the layers of the green light emitting structure in the vertical thickness direction, n 3z is the sum of the refractive indices of the layers of the blue light-emitting structure in the thickness direction, n 3xy It is the sum of the refractive indices of the layers of the blue light-emitting structure in the direction perpendicular to the thickness.

2. The OLED display device according to claim 1, characterized in that: Each layer of the red light-emitting structure includes a first anode, a first cathode, and a red OLED light-emitting block between the first anode and the first cathode; each layer of the green light-emitting structure includes a second anode, a second cathode, and a green OLED light-emitting block between the second anode and the second cathode; each layer of the blue light-emitting structure includes a third anode, a third cathode, and a blue OLED light-emitting block between the third anode and the third cathode.

3. The OLED display device according to claim 2, characterized in that: The first anode, the second anode and the third anode are located in the same layer and are disconnected in pairs, and the first cathode, the second cathode and the third cathode are located in the same layer and are connected together; (n 31z -n 31xy )-(n 11z -n 11xy )≥the first preset value, (n 31z -n 31xy )-(n 21z -n 21xy )≥ the second preset value; wherein, n 11z is the refractive index of the first anode in the thickness direction, n 11xy is the refractive index of the first anode in the direction perpendicular to the thickness, n 21z is the refractive index of the second anode in the thickness direction, n 21xy is the refractive index of the second anode in the direction perpendicular to the thickness, n 31z is the refractive index of the third anode in the thickness direction, n 31xy is the refractive index of the third anode in the direction perpendicular to the thickness; and / or (n 32z -n 32xy )-(n 12z -n 12xy )≥the first preset value, (n 32z -n 32xy )-(n 22z -n 22xy )≥ the second preset value; wherein, n 12z is the refractive index of the red OLED light-emitting block in the thickness direction, n 12xy is the refractive index of the red OLED light-emitting block in the vertical thickness direction, n 22z is the refractive index of the green OLED light-emitting block in the thickness direction, n 22xy is the refractive index of the green OLED light-emitting block in the vertical thickness direction, n 32z is the refractive index of the blue OLED light-emitting block in the thickness direction, n 32xy is the refractive index of the blue OLED light-emitting block in the vertical thickness direction.

4. The OLED display device according to claim 2, characterized in that: Each layer of the red light-emitting structure further includes a first hole transport layer, a first electron blocking layer, and at least one of a first hole blocking layer and a first electron transport layer; the first hole transport layer and the first electron blocking layer are located between the first anode and the red OLED light-emitting block, the first hole transport layer is close to the first anode, and the first electron blocking layer is far away from the first anode; the first hole blocking layer and the first electron transport layer are located between the first cathode and the red OLED light-emitting block, the first hole blocking layer is far away from the first cathode, and the first electron transport layer is close to the first cathode; Each layer of the green light-emitting structure further includes at least one of a second hole transport layer, a second electron blocking layer, a second hole blocking layer and a second electron transport layer; the second hole transport layer and the second electron blocking layer are located between the second anode and the green OLED light-emitting block, the second hole transport layer is close to the second anode, and the second electron blocking layer is far away from the second anode; the second hole blocking layer and the second electron transport layer are located between the second cathode and the green OLED light-emitting block, the second hole blocking layer is far away from the second cathode, and the second electron transport layer is close to the second cathode; Each layer of the blue light-emitting structure further includes a third hole transport layer, a third electron blocking layer, and at least one of a third hole blocking layer and a third electron transport layer; the third hole transport layer and the third electron blocking layer are located between the third anode and the blue OLED light-emitting block, the third hole transport layer is close to the third anode, and the third electron blocking layer is far away from the third anode; the third hole blocking layer and the third electron transport layer are located between the third cathode and the blue OLED light-emitting block, the third hole blocking layer is far away from the third cathode, and the third electron transport layer is close to the third cathode.

5. The OLED display device according to claim 4, characterized in that: The first hole transport layer, the second hole transport layer and the third hole transport layer are located in the same layer and are disconnected from each other; (n 33z -n 33xy )-(n 13z -n 13xy )≥the first preset value, (n 33z -n 33xy )-(n 23z -n 23xy )≥ the second preset value; wherein, n 13z is the refractive index of the first hole transport layer in the thickness direction, n 13xy is the refractive index of the first hole transport layer in the direction perpendicular to the thickness, n 23z is the refractive index of the second hole transport layer in the thickness direction, n 23xy is the refractive index of the second hole transport layer in the direction perpendicular to the thickness, n 33z is the refractive index of the third hole transport layer in the thickness direction, n 33xy is the refractive index of the third hole transport layer in the direction perpendicular to the thickness; and / or The first electron blocking layer, the second electron blocking layer and the third electron blocking layer are located in the same layer and are disconnected in pairs; (n 34z -n 34xy )-(n 14z -n 14xy )≥the first preset value, (n 34z -n 34xy )-(n 24z -n 24xy )≥ the second preset value; wherein, n 14z is the refractive index of the first electron blocking layer in the thickness direction, n 14xy is the refractive index of the first electron blocking layer in the direction perpendicular to the thickness, n 24z is the refractive index of the second electron blocking layer in the thickness direction, n 24xy is the refractive index of the second electron blocking layer in the direction perpendicular to the thickness, n 34z is the refractive index of the third electron blocking layer in the thickness direction, n 34xy is the refractive index of the third electron blocking layer in the vertical thickness direction; and / or The first hole blocking layer, the second hole blocking layer and the third hole blocking layer are located in the same layer and are disconnected from each other; (n 35z -n 35xy )-(n 15z -n 15xy )≥the first preset value, (n 35z -n 35xy )-(n 25z -n 25xy )≥ the second preset value; wherein, n 15z is the refractive index of the first hole blocking layer in the thickness direction, n 15xy is the refractive index of the first hole blocking layer in the vertical thickness direction, n 25z is the refractive index of the second hole blocking layer in the thickness direction, n 25xy is the refractive index of the second hole blocking layer in the direction perpendicular to the thickness, n 35z is the refractive index of the third hole blocking layer in the thickness direction, n 35xy is the refractive index of the third hole blocking layer in the vertical thickness direction; and / or The first electron transport layer, the second electron transport layer and the third electron transport layer are located in the same layer and are disconnected from each other; (n 36z -n 36xy )-(n 16z -n 16xy )≥the first preset value, (n 36z -n 36xy )-(n 26z -n 26xy )≥ the second preset value; wherein, n 16z is the refractive index of the first electron transport layer in the thickness direction, n 16xy is the refractive index of the first electron transport layer in the direction perpendicular to the thickness, n 26z is the refractive index of the second electron transport layer in the thickness direction, n 26xy is the refractive index of the second electron transport layer in the direction perpendicular to the thickness, n 36z is the refractive index of the third electron transport layer in the thickness direction, n 36xy is the refractive index of the third electron transport layer in the direction perpendicular to the thickness.

6. The OLED display device according to claim 4, characterized in that: Each layer of the red light-emitting structure also includes a first light extraction layer, which is located on a side of the first cathode away from the red OLED light-emitting block; each layer of the green light-emitting structure also includes a second light extraction layer, which is located on a side of the second cathode away from the green OLED light-emitting block; each layer of the blue light-emitting structure also includes a third light extraction layer, which is located on a side of the third cathode away from the blue OLED light-emitting block.

7. The OLED display device according to claim 6, characterized in that: The first light extraction layer, the second light extraction layer and the third light extraction layer are located in the same layer and are disconnected from each other; (n 37z -n 37xy )-(n 17z -n 17xy )≥the first preset value, (n 37z -n 37xy )-(n 27z -n 27xy )≥ the second preset value; wherein, n 17z is the refractive index of the first light extraction layer in the thickness direction, n 17xy is the refractive index of the first light extraction layer in the direction perpendicular to the thickness, n 27z is the refractive index of the second light extraction layer in the thickness direction, n 27xy is the refractive index of the second light extraction layer in the direction perpendicular to the thickness, n 37z is the refractive index of the third light extraction layer in the thickness direction, n 37xy is the refractive index of the third light extraction layer in the direction perpendicular to the thickness.

8. The OLED display device according to any one of claims 1 to 7, characterized in that: n 1z =n 1xy , and / or n 2z =n 2xy .

9. The OLED display device according to any one of claims 1 to 7, characterized in that: n 3z -n 3xy ≥ the third preset value, n 1z -n 1xy ≤ fourth preset value, the third preset value - the fourth preset value = the first preset value; n 2z -n 2xy ≤fifth preset value, the third preset value-the fifth preset value=the second preset value.

10. The OLED display device according to any one of claims 1 to 7, characterized in that: (n 3x -n 3y )-(n 1x -n 1y )≥ the sixth preset value, (n 3x -n 3y )-(n 2x -n 2y )≥ the seventh preset value, the range of the sixth preset value and the seventh preset value are both 0.1 to 0.3; wherein, n 1x is the sum of the refractive indices of the layers of the red light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 1y is the sum of the refractive indices of the layers of the red light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 3x is the sum of the refractive indices of the layers of the blue light-emitting structure in the first direction within the plane perpendicular to the thickness, n 3y It is the sum of the refractive indices of the layers of the blue light-emitting structure in a second direction within a plane perpendicular to the thickness, and the first direction is perpendicular to the second direction.

11. The OLED display device according to any one of claims 1 to 7, characterized in that: (n 3y -n 3x )-(n 1y -n 1x )≥ the sixth preset value, (n 3y -n 3x )-(n 2y -n 2x )≥ the seventh preset value, the range of the sixth preset value and the seventh preset value are both 0.1 to 0.3; wherein, n 1x is the sum of the refractive indices of the layers of the red light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 1y is the sum of the refractive indices of the layers of the red light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the first direction in the plane perpendicular to the thickness direction, n 2x is the sum of the refractive indices of the layers of the green light emitting structure in the second direction in the plane perpendicular to the thickness direction, n 3x is the sum of the refractive indices of the layers of the blue light-emitting structure in the first direction within the plane perpendicular to the thickness, n 3y It is the sum of the refractive indices of the layers of the blue light-emitting structure in a second direction within a plane perpendicular to the thickness, and the first direction is perpendicular to the second direction.

12. A display panel, characterized in that: include: The OLED display device according to any one of claims 1 to 11, wherein the OLED display devices are arranged in an array.

13. The display panel according to claim 12, characterized in that: The OLED display device is a bottom-emitting structure or a top-emitting structure.

14. A display device, characterized in that: include: The display panel according to claim 12 or 13.

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