CN116033782A

CN116033782A - Display panel and display device

Info

Publication number: CN116033782A
Application number: CN202211313087.9A
Authority: CN
Inventors: 高昊; 温向敏; 曾成松; 张智辉
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-04-28

Abstract

The application relates to a display panel and a display device. The display panel is provided with a light emitting side, and the light emitting side is the side of the display panel emitting light. The display panel includes: a light-emitting unit, a cathode and a color cast improving unit. The cathode is positioned at one side of the light emitting unit facing the light emitting side, and the color shift improving unit is positioned at one side of the cathode away from the color shift improving unit. The color cast improvement unit comprises at least three color cast improvement layers which are stacked, wherein each color cast improvement layer comprises a high refractive index layer and a low refractive index layer, and the refractive index of each high refractive index layer is larger than that of each low refractive index layer. The high refractive index layers and the low refractive index layers are alternately arranged in a direction of the cathode toward the light emitting side.

Description

Display panel and display device

Technical Field

The application relates to the technical field of display, in particular to a display panel and a display device.

Background

In the related art, an organic electroluminescent display device (OLED) has advantages of self-luminescence, high brightness, high contrast, fast response speed, wide viewing angle, simple structure, flexible display, and the like. At the same time, rapid developments are also being obtained due to these advantages. Are now widely used in display products.

Product visual character bias has been a major issue in the development of OLED devices. However, the existing conventional device structure adopts large-angle color cast and tends to have large deviation.

Disclosure of Invention

The application provides a display panel and a display device, which are used for solving all or part of the defects in the related art.

According to a first aspect of embodiments of the present application, there is provided a display panel having a light-emitting side, the light-emitting side being a side of the display panel from which light is emitted; the display panel includes: a light emitting unit, a cathode and a color shift improving unit;

the cathode is positioned at one side of the light emitting unit facing the light emitting side, and the color cast improving unit is positioned at one side of the cathode far from the color cast improving unit;

the color cast improvement unit comprises at least three color cast improvement layers which are stacked, wherein the color cast improvement layers comprise a high refractive index layer and a low refractive index layer, and the refractive index of the high refractive index layer is larger than that of the low refractive index layer; the high refractive index layers and the low refractive index layers are alternately arranged in a direction of the cathode toward the light emitting side.

In some embodiments, the color shift improving layer has a thickness greater than or equal to ((k x λ)/4-5) nanometers and less than or equal to ((k x λ)/4+5) nanometers; wherein k is a positive integer, and lambda is the wavelength of a specific light emitted by the light-emitting unit; meanwhile, the thickness of the color cast improvement layer is not more than 250 nanometers.

In some embodiments, the high refractive index layer has a refractive index greater than or equal to 1.8 and less than or equal to 2.1, the low refractive index layer has a refractive index greater than or equal to 1.4 and less than or equal to 1.6, and the difference between the refractive index of the high refractive index layer and the refractive index of the low refractive index layer is greater than or equal to 0.3.

In some embodiments, the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a third color shift improving layer stacked in a direction away from the cathode;

the thickness of the first color cast improvement layer is more than or equal to 10 nanometers and less than or equal to 30 nanometers, the thickness of the second color cast improvement layer is more than or equal to 50 nanometers and less than or equal to 70 nanometers, and the thickness of the third color cast improvement layer is more than or equal to 90 nanometers and less than or equal to 110 nanometers.

In some embodiments, the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, a third color shift improving layer, and a fourth color shift improving layer stacked in a direction away from the cathode;

the thickness of the first color cast improvement layer is more than or equal to 10 nanometers and less than or equal to 30 nanometers, the thickness of the second color cast improvement layer is more than or equal to 50 nanometers and less than or equal to 70 nanometers, the thickness of the third color cast improvement layer is more than or equal to 90 nanometers and less than or equal to 110 nanometers, and the thickness of the fourth color cast improvement layer is more than or equal to 110 nanometers and less than or equal to 150 nanometers.

In some embodiments, the light emitting unit includes a light emitting layer, and the color shift improving unit includes at least one enhancement improving layer;

the light emitting layer includes a red sub-light emitting layer configured to emit red light, a green sub-light emitting layer configured to emit green light, and a blue sub-light emitting layer configured to emit blue light; the projection of one or two of the three sub-luminescent layers onto the cathode is located within the projection of the enhancement layer onto the cathode.

In some embodiments, the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a first enhancement improving layer stacked in a direction away from the cathode, and a projection of the red sub-light emitting layer on the cathode is located within a projection of the first enhancement improving layer on the cathode;

the thickness of the first color cast improvement layer is more than or equal to 60 nanometers and less than or equal to 90 nanometers, the thickness of the second color cast improvement layer is more than or equal to 75 nanometers and less than or equal to 100 nanometers, and the thickness of the first enhancement improvement layer is more than or equal to 120 nanometers and less than or equal to 160 nanometers.

In some embodiments, the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a first enhancement improving layer stacked in a direction away from the cathode, and a projection of the green sub-light emitting layer on the cathode is located within a projection of the first enhancement improving layer on the cathode;

the thickness of the first color cast improvement layer is greater than or equal to 60 nanometers and less than or equal to 90 nanometers, the thickness of the second color cast improvement layer is greater than or equal to 75 nanometers and less than or equal to 100 nanometers, and the thickness of the first enhancement improvement layer is greater than or equal to 70 nanometers and less than or equal to 100 nanometers.

In some embodiments, the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a first enhancement improving layer stacked in a direction away from the cathode, and a projection of the blue sub-light emitting layer on the cathode is located within a projection of the first enhancement improving layer on the cathode;

the thickness of the first color cast improvement layer is more than or equal to 60 nanometers and less than or equal to 90 nanometers, the thickness of the second color cast improvement layer is more than or equal to 75 nanometers and less than or equal to 100 nanometers, and the thickness of the first enhancement improvement layer is more than or equal to 10 nanometers and less than or equal to 40 nanometers.

According to a second aspect of embodiments of the present application, there is provided a display device including any one of the display panels described above.

According to the embodiment of the application, the color shift improving unit is provided, and the color shift improving unit comprises at least three color shift improving layers which are stacked, wherein the color shift improving layers comprise a high refractive index layer and a low refractive index layer, and the refractive index of the high refractive index layer is larger than that of the low refractive index layer. In addition, in the direction of the cathode facing the light emitting side, the high refractive index layers and the low refractive index layers are alternately arranged, so that an anti-reflection effect similar to that of a Bragg reflector can be formed, the transmittance of light with specific wavelength is increased through the color cast improving unit, and therefore the proportion of light with different colors emitted from the light emitting side can be adjusted through the difference of the anti-reflection effect of the color cast improving unit on the light with different wavelengths, and further, the color cast of the display panel, especially the large-angle color cast of the display panel, can be effectively improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

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

Fig. 1 is a schematic structural view of a display panel according to an embodiment of the present application;

fig. 2 is a schematic structural view of another display panel according to an embodiment of the present application;

fig. 3 is a schematic structural view of another display panel according to an embodiment of the present application;

fig. 4 is a schematic structural view of another display panel according to an embodiment of the present application;

fig. 5 is a schematic structural view of another display panel according to an embodiment of the present application;

fig. 6 is a schematic structural view of another display panel according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.

An embodiment of the present application provides a display panel 10, and fig. 1 shows a schematic structural diagram of the display panel 10. As shown in fig. 1, the display panel 10 has a light emitting side C ₁ Light-emitting side C ₁ Which is the side of the display panel 10 from which light is emitted. The display panel 10 includes: color shift improving unit 11, yinA pole 12 and a light emitting unit 13.

The cathode 12 is positioned at the light emitting unit 13 and faces the light emitting side C ₁ The color shift improving unit 11 is located on a side of the cathode 12 remote from the color shift improving unit 11.

The color shift improving unit 11 includes at least three color shift improving layers 110 arranged in a stacked manner, that is, the color shift improving unit 11 may include three color shift improving layers 110 arranged in a stacked manner, or the color shift improving unit 11 may include four color shift improving layers 110 arranged in a stacked manner, or the color shift improving unit 11 may include five color shift improving layers 110 arranged in a stacked manner, but is not limited thereto. The color shift improving layer 110 includes a high refractive index layer 111 and a low refractive index layer 112, and the refractive index of the high refractive index layer 111 is greater than that of the low refractive index layer 112. At the cathode 12 toward the light-emitting side C ₁ And the high refractive index layers 111 and the low refractive index layers 112 are alternately arranged in the first direction Z. Although fig. 1 shows the alternating arrangement from the high refractive index layers 111 in the first direction Z, the alternating arrangement from the low refractive index layers 112 in the first direction Z may be used in other embodiments.

In the first direction Z, the light emitting unit 13 includes a hole injection layer 132, a hole transport layer 133, a light emitting layer 131, an electron transport layer 134, and an electron injection layer 135, which are stacked. Wherein, the electron injection layer 135 is located at a side of the cathode 12 away from the color shift improving unit 11, the electron transport layer 134 is located at a side of the electron injection layer 135 away from the color shift improving unit 11, the light emitting layer 131 is located at a side of the electron transport layer 134 away from the color shift improving unit 11, the hole transport layer 133 is located at a side of the light emitting layer 131 away from the color shift improving unit 11, and the hole injection layer 132 is located at a side of the hole transport layer 133 away from the color shift improving unit 11.

The electron injection layer 135 is configured to lower a barrier for electrons to enter the light emitting unit 13 so that electrons more easily enter the light emitting unit 13. The electron transport layer 134 is configured to facilitate electron transport to the light emitting layer 131. The hole injection layer 132 is configured to lower the barrier to holes entering the light emitting unit 13, so that holes more easily enter the light emitting unit 13. The hole transport layer 133 is configured to promote electron transport to the light emitting layer 131. And the holes transported in the hole transport layer 133 and the electrons transported in the electron transport layer 134 are recombined in the light emitting layer 131 to form excitons, and thus the light emitting layer 131 emits light by the excitons formed by the recombination of the holes and the electrons.

As can be seen from the above embodiments, by providing the color shift improving unit 11, the color shift improving unit 11 includes at least three color shift improving layers 110 stacked, the color shift improving layers 110 include a high refractive index layer 111 and a low refractive index layer 112, and the refractive index of the high refractive index layer 111 is greater than that of the low refractive index layer 112. And, at the cathode 12, toward the light-emitting side C ₁ The high refractive index layers 111 and the low refractive index layers 112 are alternately arranged in the first direction Z, so that an anti-reflection effect similar to a bragg mirror can be formed to increase the transmittance of light with a specific wavelength through the color cast improving unit 11, and thus, the difference of the anti-reflection effect of the color cast improving unit 11 on light with different wavelengths can be used to adjust the light output side C ₁ The proportion of the emitted light with different colors can further effectively improve the color cast of the display panel 10, especially the large-angle color cast of the display panel 10. The large-angle color shift herein refers to the color shift of the display panel 10 when the observation point forms an angle of 30 degrees or more with the first direction Z, and the same applies to the large-angle color shift as mentioned below.

In some embodiments, as shown in fig. 1, the display panel 10 further includes: a packaging unit 14, an anode 15 and a substrate unit 16.

The packaging unit 14 is positioned at the color shift improving unit 11 and faces the light emitting side C ₁ Is provided. Specifically, the packaging unit 14 may include a packaging layer (not separately shown) and a glass cover plate (not separately shown), where the packaging layer is located on the light emitting side C of the color deviation improving unit 11 ₁ The glass cover plate is positioned on one side of the encapsulation layer away from the color cast improvement unit 11. The encapsulation layer is configured to encapsulate and protect the film structure of the display panel 10, so that oxygen and water vapor can be prevented from entering the film structure of the display panel 10 and damaging the film structure of the display panel 10. The glass cover plate is configured to protect the respective film structures of the display panel 10. It should be noted thatAlthough the encapsulation unit 14 in fig. 1 has only one layer structure, it may actually include two side structures of the encapsulation layer and the glass cover plate that are independent of each other.

Anode 15 is located at light emitting unit 13 away from light emitting side C ₁ Is located on the side of the anode 15 remote from the light emitting unit 13. Specifically, the substrate unit 16 may include a driving array (not separately shown), a planarization layer (not separately shown), and a substrate base plate (not separately shown). Wherein the flat layer is located at a side of the light emitting unit 13 away from the cathode 12, the substrate is located at a side of the flat layer away from the light emitting unit 13, and the driving array is located between the flat layer and the substrate. The driving array is configured to drive the light emitting unit 13 to emit light. The flat layer is configured to fill the uneven part on the substrate after the driving array is formed, so that the flat layer on one side far away from the substrate can be ensured to be flat, and the influence on the film layer on one side far away from the substrate can be avoided. It should also be noted that, although the substrate unit 16 in fig. 1 has only one layer structure, it may actually include a three-sided structure where the driving array, the flat layer and the substrate are independent of each other.

In some embodiments, the thickness of the color shift improving layer 110 is greater than or equal to ((k λ)/4-5) nanometers and less than or equal to ((k λ)/4+5) nanometers. Where k is a positive integer and λ is the wavelength of a specific light emitted from the light emitting unit 13. Meanwhile, the thickness of the color cast improvement layer is not more than 250 nanometers. By such arrangement, the anti-reflection effect of the color cast improving unit 11 on the specific wavelength can be further improved, so that the difference of the anti-reflection effect of the color cast improving unit 11 on the light with different wavelengths can be further accurately adjusted to adjust the light emergent side C ₁ The proportion of the emitted light with different colors can further effectively improve the color cast of the display panel 10, especially the large-angle color cast of the display panel 10.

In some embodiments, the refractive index of the high refractive index layer 111 is greater than or equal to 1.8 and less than or equal to 2.1. Specifically, the refractive index of the high refractive index layer 111 may be 1.8, or the refractive index of the high refractive index layer 111 may be 1.9Alternatively, the refractive index of the high refractive index layer 111 may be 2.0, or the refractive index of the high refractive index layer 111 may be 2.1, but is not limited thereto. The low refractive index layer 112 has a refractive index of 1.4 or more and 1.6 or less. Specifically, the refractive index of the low refractive index layer 112 may be 1.4, or the refractive index of the low refractive index layer 112 may be 1.5, or the refractive index of the low refractive index layer 112 may be 1.6, but is not limited thereto. And a difference between the refractive index of the high refractive index layer 111 and the refractive index of the low refractive index layer 112 is greater than or equal to 0.3. By such arrangement, the anti-reflection effect of the color cast improving unit 11 on the specific wavelength can be further improved, so that the difference of the anti-reflection effect of the color cast improving unit 11 on the light with different wavelengths can be further accurately adjusted to adjust the light emergent side C ₁ The proportion of the emitted light with different colors can further effectively improve the color cast of the display panel 10, especially the large-angle color cast of the display panel 10. The refractive index of each of the high refractive index layer 111 and the low refractive index layer 112 means a refractive index when light having a wavelength of 550 nm passes therethrough.

In some embodiments, as shown in fig. 1, the color shift improving unit 11 includes a first color shift improving layer 113, a second color shift improving layer 114, and a third color shift improving layer 115 stacked along a first direction Z.

The first color deviation improving layer 113 and the third color deviation improving layer 115 may be low refractive index layers 112, and the second color deviation improving layer 114 may be high refractive index layers 111, but is not limited thereto.

The thickness of the first color shift improving layer 113 is 10 nm or more and 30 nm or less. Specifically, the thickness of the first color deviation improving layer 113 may be 10 nanometers, or the thickness of the first color deviation improving layer 113 may be 20 nanometers, or the thickness of the first color deviation improving layer 113 may be 30 nanometers, but is not limited thereto. The thickness of the second color shift improving layer 114 is 50 nm or more and 70 nm or less. Specifically, the thickness of the second color shift improving layer 114 may be 50 nanometers, or the thickness of the second color shift improving layer 114 may be 60 nanometers, or the thickness of the second color shift improving layer 114 may be 70 nanometers, but is not limited thereto. The thickness of the third polarization improving layer 115 is 90 nm or more and 110 nm or less. Specifically, the thickness of the third bias improving layer 115 may be 90 nanometers, or the thickness of the third bias improving layer 115 may be 100 nanometers, or the thickness of the third bias improving layer 115 may be 110 nanometers, but is not limited thereto.

Table 1 below shows the changes in viewing angle color shift values at different angles before and after the color shift improving unit 11 is provided in the scheme shown in fig. 1:

visual angle color cast value (JNCD)	Angle of 30 degree	Angle of 45 degree	Angle of 60 degree
				Before setting	2.4	4.3	7.2
After setting up	2.2	1.9	0.8

TABLE 1

As shown in table 1 above, after the color shift improving unit 11 is provided, the viewing angle color shift values are improved at different angles, and as the angle increases, the improvement of the viewing angle color shift values becomes more remarkable. It should be noted that, the angles in the table refer to the angles between the observation point and the first direction Z, and the angles mentioned below are the same.

In some embodiments, as shown in fig. 2, the color shift improving unit 11 includes a first color shift improving layer 113, a second color shift improving layer 114, a third color shift improving layer 115, and a fourth color shift improving layer 116 stacked along a first direction Z.

The first color bias improving layer 113 and the third color bias improving layer 115 may be the low refractive index layer 112, and the second color bias improving layer 114 and the fourth color bias improving layer 116 may be the high refractive index layer 111, but are not limited thereto.

The thickness of the first color shift improving layer 113 is 10 nm or more and 30 nm or less. Specifically, the thickness of the first color deviation improving layer 113 may be 10 nanometers, or the thickness of the first color deviation improving layer 113 may be 20 nanometers, or the thickness of the first color deviation improving layer 113 may be 30 nanometers, but is not limited thereto. The thickness of the second color shift improving layer 114 is 50 nm or more and 70 nm or less. Specifically, the thickness of the second color shift improving layer 114 may be 50 nanometers, or the thickness of the second color shift improving layer 114 may be 60 nanometers, or the thickness of the second color shift improving layer 114 may be 70 nanometers, but is not limited thereto. The thickness of the third polarization improving layer 115 is 90 nm or more and 110 nm or less. Specifically, the thickness of the third bias improving layer 115 may be 90 nanometers, or the thickness of the third bias improving layer 115 may be 100 nanometers, or the thickness of the third bias improving layer 115 may be 110 nanometers, but is not limited thereto. The thickness of the fourth color shift improving layer 116 is 110 nm or more and 150 nm or less. Specifically, the thickness of the fourth color bias improvement layer 116 may be 110 nanometers, or the thickness of the fourth color bias improvement layer 116 may be 120 nanometers, or the thickness of the fourth color bias improvement layer 116 may be 130 nanometers, or the thickness of the fourth color bias improvement layer 116 may be 140 nanometers, or the thickness of the fourth color bias improvement layer 116 may be 150 nanometers, but is not limited thereto.

Table 2 below shows the changes in viewing angle color shift values at different angles before and after the color shift improving unit 11 is provided in the scheme shown in fig. 2:

visual angle color cast value (JNCD)	Angle of 30 degree	Angle of 45 degree	Angle of 60 degree
				Before setting	2.4	4.3	7.2
After setting up	2.5	1.7	1.4

TABLE 2

As shown in table 2 above, after the color shift improving unit 11 is provided, the viewing angle color shift values are improved at both angles of 45 degrees and 60 degrees, and as the angle increases, the improvement of the viewing angle color shift values becomes more remarkable.

In some embodiments, as shown in fig. 3 to 6, the light emitting unit 13 includes a light emitting layer 131, and the color shift improving unit 11 includes at least one reinforcing improving layer 117.

The light emitting layer 131 includes a red sub-light emitting layer 131r configured to emit red light, a green sub-light emitting layer 131g configured to emit green light, and a blue sub-light emitting layer 131b configured to emit blue light. The projection of one or both of the three sub-luminescent layers 131 onto the cathode 12 is located within the projection of the enhancement layer 117 onto the cathode 12. By providing a layer covering one or more of the three sub-luminescent layers 131The enhancement improving layer 117 of the two sub-luminescent layers 131 can further enhance the transmittance of the light emitted by the sub-luminescent layers 131 through the color cast improving unit 11, and further enhance the anti-reflection effect of the color cast improving unit 11 on specific wavelengths, so that the difference of the anti-reflection effects of the color cast improving unit 11 on light with different wavelengths can be further accurately adjusted to adjust the light emitting side C ₁ The proportion of the emitted light with different colors can further effectively improve the color cast of the display panel 10, especially the large-angle color cast of the display panel 10.

It should be noted that, fig. 3 to 6 show only three preferred solutions that are easier to prepare in terms of technology and have the most reasonable comprehensive efficiency, but the solutions are not limited thereto in practice, and other solutions meeting the above conditions are also within the scope of protection of the present application. Note that, although fig. 3 to 6 show gaps between the color shift improving unit 11 and other film layers, fig. 3 to 6 are merely exemplary, and in practice, these gaps may be filled by providing a flat layer or the like, and in a practical embodiment, no gap exists between the color shift improving unit 11 and other film layers.

In some embodiments, as shown in fig. 3, the color shift improving unit 11 includes a first color shift improving layer 113, a second color shift improving layer 114 and a first enhancement improving layer 1171 stacked in the first direction Z, and the projection of the red sub-luminescent layer 131r on the cathode 12 is located within the projection of the first enhancement improving layer 1171 on the cathode 12.

The first color shift improving layer 113 and the first enhancement improving layer 1171 may be the high refractive index layer 111, and the second color shift improving layer 114 may be the low refractive index layer 112, but is not limited thereto.

The thickness of the first color shift improving layer 113 is 60 nm or more and 90 nm or less. Specifically, the thickness of the first color deviation improving layer 113 may be 60 nanometers, or the thickness of the first color deviation improving layer 113 may be 70 nanometers, or the thickness of the first color deviation improving layer 113 may be 80 nanometers, or the thickness of the first color deviation improving layer 113 may be 90 nanometers, but is not limited thereto. The thickness of the second color shift improving layer 114 is 75 nm or more and 100 nm or less. Specifically, the thickness of the second color shift improving layer 114 may be 75 nanometers, or the thickness of the second color shift improving layer 114 may be 80 nanometers, or the thickness of the second color shift improving layer 114 may be 90 nanometers, or the thickness of the second color shift improving layer 114 may be 100 nanometers, but is not limited thereto. The thickness of the first enhancement layer 1171 is 120 nm or more and 160 nm or less. Specifically, the thickness of the first reinforcing and improving layer 1171 may be 120 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 130 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 140 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 150 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 160 nanometers, but is not limited thereto.

Table 3 below shows the changes in viewing angle color shift values at different angles before and after the color shift improving unit 11 is provided in the scheme shown in fig. 3:

visual angle color cast value (JNCD)	Angle of 30 degree	Angle of 45 degree	Angle of 60 degree
				Before setting	2.4	4.3	7.2
After setting up	1.9	1.4	0.9

TABLE 3 Table 3

As shown in table 3 above, after the color shift improving unit 11 was provided, the viewing angle color shift values were all improved at different angles, and as the angle increased, the improvement of the viewing angle color shift values was more remarkable.

In some embodiments, as shown in fig. 4, the color shift improving unit 11 includes a first color shift improving layer 113, a second color shift improving layer 114 and a first enhancement improving layer 1171 stacked in the first direction Z, and a projection of the green sub-emitting layer 131g on the cathode 12 is located within a projection of the first enhancement improving layer 1171 on the cathode 12.

The thickness of the first color shift improving layer 113 is 60 nm or more and 90 nm or less. Specifically, the thickness of the first color deviation improving layer 113 may be 60 nanometers, or the thickness of the first color deviation improving layer 113 may be 70 nanometers, or the thickness of the first color deviation improving layer 113 may be 80 nanometers, or the thickness of the first color deviation improving layer 113 may be 90 nanometers, but is not limited thereto. The thickness of the second color shift improving layer 114 is 75 nm or more and 100 nm or less. Specifically, the thickness of the second color shift improving layer 114 may be 75 nanometers, or the thickness of the second color shift improving layer 114 may be 80 nanometers, or the thickness of the second color shift improving layer 114 may be 90 nanometers, or the thickness of the second color shift improving layer 114 may be 100 nanometers, but is not limited thereto. The thickness of the first enhancement layer 1171 is 70 nm or more and 100 nm or less. Specifically, the thickness of the first reinforcing and improving layer 1171 may be 70 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 80 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 90 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 100 nanometers, but is not limited thereto.

Table 4 below shows the changes in viewing angle color shift values at different angles before and after the color shift improving unit 11 is provided in the scheme shown in fig. 4:

visual angle color cast value (JNCD)	Angle of 30 degree	Angle of 45 degree	Angle of 60 degree
				Before setting	2.4	4.3	7.2
After setting up	2.0	2.3	0.5

TABLE 4 Table 4

As shown in table 4 above, after the color shift improving unit 11 was provided, the viewing angle color shift values at different angles were improved.

In some embodiments, as shown in fig. 5, the color shift improving unit 11 includes a first color shift improving layer 113, a second color shift improving layer 114 and a first enhancement improving layer 1171 stacked in the first direction Z, and the projection of the blue sub-emitting layer 131b on the cathode 12 is located within the projection of the first enhancement improving layer 1171 on the cathode 12.

The thickness of the first color shift improving layer 113 is 60 nm or more and 90 nm or less. Specifically, the thickness of the first color deviation improving layer 113 may be 60 nanometers, or the thickness of the first color deviation improving layer 113 may be 70 nanometers, or the thickness of the first color deviation improving layer 113 may be 80 nanometers, or the thickness of the first color deviation improving layer 113 may be 90 nanometers, but is not limited thereto. The thickness of the second color shift improving layer 114 is 75 nm or more and 100 nm or less. Specifically, the thickness of the second color shift improving layer 114 may be 75 nanometers, or the thickness of the second color shift improving layer 114 may be 80 nanometers, or the thickness of the second color shift improving layer 114 may be 90 nanometers, or the thickness of the second color shift improving layer 114 may be 100 nanometers, but is not limited thereto. The thickness of the first enhancement layer 1171 is 10 nm or more and 40 nm or less. Specifically, the thickness of the first reinforcing and improving layer 1171 may be 10 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 20 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 30 nanometers, or the thickness of the first reinforcing and improving layer 1171 may be 40 nanometers, but is not limited thereto.

Table 5 below shows the changes in viewing angle color shift values at different angles before and after the color shift improving unit 11 is provided in the scheme shown in fig. 5:

visual angle color cast value (JNCD)	Angle of 30 degree	Angle of 45 degree	Angle of 60 degree
				Before setting	2.4	4.3	7.2
After setting up	1.2	0.6	0.5

TABLE 5

As shown in table 5 above, after the color shift improving unit 11 was provided, the viewing angle color shift values were all improved at different angles, and as the angle increased, the improvement of the viewing angle color shift values was more remarkable.

In some embodiments, as shown in fig. 6, the color shift improving unit 11 includes a second enhancement improving layer 1172 stacked in the first direction Z, a second color shift improving layer 114, and a third color shift improving layer 115, and the projection of the green sub-emitting layer 131g on the cathode 12 is located within the projection of the second enhancement improving layer 1172 on the cathode 12.

The second enhancement improving layer 1172 and the third color shift improving layer 115 may be the low refractive index layer 112, and the second color shift improving layer 114 may be the high refractive index layer 111, but is not limited thereto.

The thickness of the second enhancement layer 1172 is greater than 0 nm and equal to or less than 20 nm. Specifically, the thickness of the second reinforcing and improving layer 1172 may be 5 nanometers, or the thickness of the second reinforcing and improving layer 1172 may be 10 nanometers, or the thickness of the second reinforcing and improving layer 1172 may be 15 nanometers, or the thickness of the second reinforcing and improving layer 1172 may be 20 nanometers, but is not limited thereto. The thickness of the second color shift improving layer 114 is 60 nm or more and 90 nm or less. Specifically, the thickness of the second color shift improving layer 114 may be 60 nanometers, or the thickness of the second color shift improving layer 114 may be 70 nanometers, or the thickness of the second color shift improving layer 114 may be 80 nanometers, or the thickness of the second color shift improving layer 114 may be 90 nanometers, but is not limited thereto. The thickness of the third polarization improving layer 115 is 60 nm or more and 90 nm or less. Specifically, the thickness of the third bias improving layer 115 may be 60 nanometers, or the thickness of the third bias improving layer 115 may be 70 nanometers, or the thickness of the third bias improving layer 115 may be 80 nanometers, or the thickness of the third bias improving layer 115 may be 90 nanometers, but is not limited thereto.

In some embodiments, the material of the low refractive index layer 112 may include lithium fluoride (LiF), silicon oxide (SiO), and small molecule organic materials. The material of the high refractive index layer 111 may include silicon nitride (SiN), molybdenum trioxide (MoO) ₃ ) And small molecule organic materials.

The present application also provides a display device comprising any of the display panels 10 described above.

The above embodiments of the present application may be complementary to each other without conflict.

It is noted that in the drawings, the size of layers and regions may be exaggerated for clarity of illustration. Moreover, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or intervening layers may be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may be present. In addition, it will be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or more than one intervening layer or element may also be present. Like reference numerals refer to like elements throughout.

The term "plurality" refers to two or more, unless explicitly defined otherwise.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It is to be understood that the present application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A display panel, wherein the display panel has a light-emitting side, the light-emitting side being a side of the display panel from which light is emitted; the display panel includes: a light emitting unit, a cathode and a color shift improving unit;

2. The display panel according to claim 1, wherein the thickness of the color shift improvement layer is greater than or equal to ((k x λ)/4-5) nm and less than or equal to ((k x λ)/4+5) nm; wherein k is a positive integer, and lambda is the wavelength of a specific light emitted by the light-emitting unit; meanwhile, the thickness of the color cast improvement layer is not more than 250 nanometers.

3. The display panel according to claim 1, wherein a refractive index of the high refractive index layer is greater than or equal to 1.8 and less than or equal to 2.1, a refractive index of the low refractive index layer is greater than or equal to 1.4 and less than or equal to 1.6, and a difference between the refractive index of the high refractive index layer and the refractive index of the low refractive index layer is greater than or equal to 0.3.

4. The display panel according to claim 3, wherein the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a third color shift improving layer stacked in a direction away from the cathode;

5. The display panel according to claim 3, wherein the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, a third color shift improving layer, and a fourth color shift improving layer stacked in a direction away from the cathode;

6. A display panel according to claim 3, wherein the light emitting unit comprises a light emitting layer and the color shift improving unit comprises at least one reinforcing improving layer;

7. The display panel according to claim 6, wherein the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a first enhancement improving layer stacked in a direction away from the cathode, a projection of the red sub-light emitting layer on the cathode being located within a projection of the first enhancement improving layer on the cathode;

8. The display panel according to claim 6, wherein the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a first enhancement improving layer stacked in a direction away from the cathode, a projection of the green sub-light emitting layer on the cathode being located within a projection of the first enhancement improving layer on the cathode;

9. The display panel according to claim 6, wherein the color shift improving unit includes a first color shift improving layer, a second color shift improving layer, and a first enhancement improving layer stacked in a direction away from the cathode, and a projection of the blue sub-light emitting layer on the cathode is located within a projection of the first enhancement improving layer on the cathode;

10. A display device comprising the display panel according to any one of claims 1 to 9.