Display panel and display device

Abstract

The embodiments of the present invention provide a display panel and a display device, which relate to the field of display technology and improve brightness uniformity and color deviation. The display panel includes: a substrate; sub-pixels, including dimming sub-pixels; a dimming structure located on the side of the sub-pixel facing away from the substrate, including multiple light extraction parts and a high refractive index layer; in the direction perpendicular to the substrate, the light extraction part is located on one side of the dimming sub-pixel, and the side of the light extraction part close to the dimming sub-pixel is the dimming side, and the dimming side includes a first oblique side; the high refractive index layer covers the sub-pixel and the extraction part, and the refractive index of the high refractive index layer is greater than the refractive index of the light extraction part; the light extraction part includes a first extraction part and a second extraction part, the first extraction part is located on one side of the dimming sub-pixel in the first direction, and the second extraction part is located on one side of the dimming sub-pixel in the second direction; the angle between the first oblique side and the second direction in the first extraction part is different from the angle between the first oblique side and the first direction in the second extraction part.

Description

[Technical field]

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a display device. [Background technology]

[0002] With the continuous development of display technology, organic light-emitting diode (OLED) display panels have been widely used in various electronic devices due to their advantages such as self-luminescence, wide viewing angle, high contrast and low energy consumption.

[0003] However, existing OLED display panels have problems such as uneven brightness and color cast, which seriously affect the display performance. [Summary of the invention]

[0004] In view of this, embodiments of the present invention provide a display panel and a display device to effectively improve brightness uniformity and color cast.

[0005] In one aspect, an embodiment of the present invention provides a display panel, including:

[0006] substrate;

[0007] A sub-pixel located on one side of the substrate, the sub-pixel comprising a dimming sub-pixel;

[0008] A dimming structure located on the side of the sub-pixel facing away from the substrate, the dimming structure comprising a plurality of light extraction portions and a high refractive index layer; wherein, in a direction perpendicular to the plane where the substrate is located, the light extraction portion is located on one side of the dimming sub-pixel, the side of the light extraction portion close to the dimming sub-pixel is a dimming side, and the dimming side comprises a first oblique side; the high refractive index layer is located on the side of the light extraction portion facing away from the substrate and covers the sub-pixel and the extraction portion, and the refractive index of the high refractive index layer is greater than the refractive index of the light extraction portion;

[0009] The light extraction portion includes a first extraction portion and a second extraction portion, and in a direction perpendicular to the plane where the substrate is located, the first extraction portion is located on one side of the dimming sub-pixel in the first direction, and the second extraction portion is located on one side of the dimming sub-pixel in the second direction;

[0010] An angle between the first oblique side and the second direction in the first extraction portion is different from an angle between the first oblique side and the first direction in the second extraction portion.

[0011] On the other hand, an embodiment of the present invention provides a display device including the display panel.

[0012] One of the above technical solutions has the following beneficial effects:

[0013] In an embodiment of the present invention, by designing the included angle λ1 between the first hypotenuse and the second direction in the first extraction part and the included angle ε1 between the first hypotenuse and the first direction in the second extraction part to be different, the equivalent tper angle θ0′ corresponding to the light at 90° and 0° azimuths emitted by the dimming sub-pixel when transmitted to the light extraction part can be adjusted, so as to utilize the influence of the equivalent tper angle θ0′ on the lift rate η to compensate for the influence of the different design sizes of the light extraction part on the lift rate η, thereby reducing the difference in the regulation of light by the first extraction part and the second extraction part, so that the degree of improvement of the light output efficiency of the 90° azimuth light emitted by the dimming sub-pixel by the first extraction part and the degree of improvement of the light output efficiency of the 0° azimuth light emitted by the dimming sub-pixel by the second extraction part tend to be consistent, thereby effectively reducing the brightness difference of the display panel at different azimuths and improving color deviation.

[0014] In addition, in the manufacturing process of the display panel, by adopting the above structure, it is only necessary to adjust the mask pattern used to form the light extraction part so that the control edge of the light extraction part has a bevel edge, without adding other complex processes, and the feasibility is higher.

Brief Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A top view of a display panel provided by an embodiment of the present invention;

[0017] Figure 2 A schematic diagram of a film layer structure of a display panel provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of light transmission provided by an embodiment of the present invention;

[0019] Figure 4 Another schematic diagram of light transmission provided by an embodiment of the present invention;

[0020] Figure 5 A schematic diagram of the dimensions of a dimming sub-pixel and a light extraction unit provided in an embodiment of the present invention;

[0021] Figure 6 Another top view of the display panel provided by the embodiment of the present invention;

[0022] Figure 7 A schematic diagram of the structure of a light extraction unit provided by an embodiment of the present invention;

[0023] Figure 8 An angle schematic diagram provided by an embodiment of the present invention;

[0024] Fig. 9 Another schematic diagram of the structure of the light extraction unit provided by an embodiment of the present invention;

[0025] Fig.10 A schematic diagram of another structure of the light extraction unit provided by an embodiment of the present invention;

[0026] Fig.11 Another top view of the display panel provided by the embodiment of the present invention;

[0027] Fig.12 for Fig.11 The corresponding partial enlarged schematic diagram;

[0028] Fig.13 Another top view of the display panel provided by the embodiment of the present invention;

[0029] Fig.14 for Fig.13 The corresponding partial enlarged schematic diagram;

[0030] Fig.15 A schematic diagram of an arrangement of sub-pixels provided in an embodiment of the present invention;

[0031] Fig.16 A schematic diagram of another arrangement of sub-pixels provided in an embodiment of the present invention;

[0032] Fig.17 A schematic diagram of another structure of the light extraction unit provided by an embodiment of the present invention;

[0033] Fig.18 A schematic diagram of another structure of a light extraction unit provided by an embodiment of the present invention;

[0034] Fig.19 A cross-sectional view of a light extraction portion provided by an embodiment of the present invention;

[0035] Fig. 20 A schematic diagram of the structure of a display device provided by an embodiment of the present invention. [Specific implementation method]

[0036] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0039] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] During the research, the inventors found that in the film structure of the existing display panel, the sub-pixels are covered with multiple structures such as the encapsulation layer, polarizer, and cover plate. When the light emitted by the light-emitting device is transmitted outward, it needs to pass through the reflection and refraction of multiple film layers. Due to the differences in the optical properties of different film materials, light will be lost inside the display panel in the form of total reflection during transmission. For example, light will be fully emitted at the interface between the display panel and the air, resulting in a large amount of energy loss, so that the light that can finally be emitted from the display panel only accounts for about 15% of the light emitted by the light-emitting device, resulting in low light extraction efficiency of the display panel.

[0041] It is understandable that the luminous efficiency of different sub-pixels is different due to the characteristics of the luminescent material. For the sub-pixels with lower luminous efficiency, these sub-pixels have lower luminous efficiency and lower light extraction efficiency. Therefore, in order to make these sub-pixels have sufficient display brightness, it is necessary to increase the driving current flowing to these sub-pixels. However, under the action of high current, the life of these sub-pixels will decay rapidly, resulting in a large difference in the degree of life decay compared with other sub-pixels.

[0042] In this regard, the present invention proposes that a dimming structure can be added to the display panel, and the dimming structure can be used to change the transmission direction of light, thereby increasing the light extraction efficiency of the display panel and allowing more light to be emitted through the panel.

[0043] like Figure 1 and Figure 2 As shown, Figure 1 A top view of a display panel provided by an embodiment of the present invention, Figure 2A schematic diagram of a film layer structure of a display panel provided in an embodiment of the present invention, the display panel comprises a substrate 1, a sub-pixel 2 located on one side of the substrate 1, and a dimming structure 3 located on a side of the sub-pixel 2 facing away from the substrate 1.

[0044] Among them, the sub-pixel 2 includes a dimming sub-pixel 6, and the dimming sub-pixel 6 can be a sub-pixel with low luminous efficiency. The dimming structure 3 includes a plurality of light extraction parts 4 and a high refractive index layer 5. Among them, in the direction perpendicular to the plane where the substrate 1 is located, the light extraction part 4 is located on one side of the dimming sub-pixel 6, and the high refractive index layer 5 is located on the side of the light extraction part 4 facing away from the substrate 1, and covers the light extraction part 4 and the sub-pixel 2, and the refractive index of the high refractive index layer 5 is greater than the refractive index of the light extraction part 4.

[0045] In the above structure, combined with Figure 2 , the interface where the high refractive index layer 5 contacts the light extraction part 4, that is, the side wall of the light extraction part 4 will form a total reflection interface. When the light emitted by the dimming sub-pixel 6 reaches the interface, it will be totally reflected on the interface, thereby changing its transmission direction. In this way, the light that was originally unable to be emitted through the panel can eventually be emitted from the display panel after being regulated by the dimming structure 3. Therefore, the above structure can significantly improve the light output efficiency of the dimming sub-pixel 6, and thus the display brightness of the dimming sub-pixel 6 can be improved by increasing the light output efficiency, and thus there is no need to increase the driving current flowing to the dimming sub-pixel 6, thereby reducing the life decay rate of the dimming sub-pixel 6 and improving the uniformity of the life decay degree between different sub-pixels 2.

[0046] However, the inventors further discovered that when the light extraction portion 4 is located at different positions of the dimming sub-pixel 6, the degree to which the light extraction portion 4 improves the light extraction efficiency of the light emitted by the dimming sub-pixel 6 at different positions is also different, which will cause the display panel to have brightness differences at different viewing angles, affecting the brightness uniformity and also producing a certain degree of color deviation.

[0047] The following describes the improvement rate of the light extraction efficiency of the light-modulating sub-pixel 6 by a single light extraction unit 4 in combination with a specific film layer structure:

[0048] Combination Figure 2 ,like Figure 3 As shown, Figure 3 A schematic diagram of light transmission provided in an embodiment of the present invention, the display panel also includes an encapsulation layer 7 located between the sub-pixel 2 and the dimming structure 3, the encapsulation layer 7 generally includes a first inorganic encapsulation layer 8, an organic encapsulation layer 9 located on the side of the first inorganic encapsulation layer 8 facing away from the substrate 1, and a second inorganic encapsulation layer 10 located on the side of the organic encapsulation layer 9 facing away from the substrate 1.

[0049] The incident angle of the edge light emitted by the dimming sub-pixel 6 near the light extraction part 4 when entering the organic encapsulation layer 9 from the first inorganic encapsulation layer 8 is θ1. If this part of the edge light is to be able to be emitted from the display panel in the end, θ1 satisfies: θ1∈(θ air ,δ2), where θ air is the maximum incident angle that the edge light can have when it can be emitted from the display panel through the interface between the display panel and the air without being reflected by the light extraction part 4, θ air Can be n1 is the refractive index of the dimming sub-pixel 6, that is, the refractive index of the luminescent material of the dimming sub-pixel 6, δ2 is the total reflection angle corresponding to the edge light incident from the first inorganic encapsulation layer 8 to the organic encapsulation layer 9, n3 is the refractive index of the first inorganic encapsulation layer 8 , and n4 is the refractive index of the organic encapsulation layer 9 .

[0050] Assuming that the total reflection angle corresponding to the incident light from the high refractive index layer 5 to the light extraction portion 4 is δ1, n6 is the refractive index of the light extraction part 4, and n7 is the refractive index of the high refractive index layer 5. The incident angle θ6 at which light is reflected on the side wall of the light extraction part 4 is θ6=(90°-θ5)+(90°-θ0), where θ0 is the angle between the side and bottom of the light extraction part 4, hereinafter referred to as the typer angle of the light extraction part 4, and θ5 is the exit angle of light when it enters the high refractive index layer 5 from the second inorganic encapsulation layer 10. To ensure that all light can be reflected on the side wall of the light extraction part 4, θ6 needs to satisfy: θ6∈(δ1, 90°).

[0051] According to the refraction formula, sinθ4×n5=sinθ5×n7, and we get: Wherein, θ4 is the emission angle of light when entering the second inorganic encapsulation layer 10 from the organic encapsulation layer 9 , and n5 is the refractive index of the second inorganic encapsulation layer 10 .

[0052] Since the refractive index of the first inorganic encapsulation layer 8 and the second inorganic encapsulation layer 10 is the same, the exit angle θ4 when the light enters the second inorganic encapsulation layer 10 from the organic encapsulation layer 9 is equal to the incident angle θ1 when the light enters the organic encapsulation layer 9 from the first inorganic encapsulation layer 8. It can be deduced Combining the relationship between θ5 and θ6, we can conclude

[0053] Combined with θ1∈(θ air , δ2) and The following four situations can be concluded:

[0054] The first case: When hour,

[0055] The second situation: When hour,

[0056] The third situation: When hour,

[0057] The fourth situation: When θ1∈(θ air , δ2).

[0058] When θ1 satisfies the above four conditions, the edgemost light emitted by the dimming sub-pixel 6 can be emitted through the light emitting interface of the display panel.

[0059] Combined with the above analysis of the angle range of θ1, Figure 4 As shown, Figure 4 Another light transmission schematic diagram provided in an embodiment of the present invention, the distance between points AB in the dimming sub-pixel 6 is d, wherein point A emits light ①, point B emits light ②, light ① and light ② are parallel, and light ① is reflected at the junction of the side and top surfaces of the light extraction portion 4, while light ② is reflected at the junction of the side and bottom surfaces of the light extraction portion 4.

[0060] d = h × (tan (180 ° - θ5 - θ0) - cot θ0), where h is the thickness of the light extraction portion 4 in the direction perpendicular to the plane of the substrate 1. Furthermore, we can obtain the functional relationship between d and h, θ0 and θ1: d=d(h, θ0, θ1).

[0061] At this time, the light extraction unit 4 increases the light extraction efficiency of the light emitted by the photomodulation sub-pixel 6 by η. Among them, in the direction perpendicular to the plane where the substrate 1 is located, the side of the dimming sub-pixel 6 close to the light extraction portion 4 is the first side, the side intersecting the first side is the second side, D1 is the length of the first side, D2 is the length of the second side, w is the length of the side of the light extraction portion 4 close to the dimming sub-pixel 6, E(θ1) represents the spatial energy distribution of the light emitted by the dimming sub-pixel 6, θ1 max and θ1 min are the maximum and minimum values ​​of θ1 determined in the above four cases respectively.

[0062] Based on the above analysis, if Figure 5 As shown, Figure 5A size schematic diagram of the dimming sub-pixel 6 and the light extraction portion 4 provided in an embodiment of the present invention, the light extraction portion 4 includes a first extraction portion 11 and a second extraction portion 12, in a direction perpendicular to the plane where the substrate 1 is located, the first extraction portion 11 is located on one side of the dimming sub-pixel 6 in the first direction x, the second extraction portion 12 is located on one side of the dimming sub-pixel 6 in the second direction y, the first extraction portion 11 is mainly used to improve the light output efficiency of the light emitted by the dimming sub-pixel 6 at 90°, and the second extraction portion 12 is mainly used to improve the light output efficiency of the light emitted by the dimming sub-pixel 6 at 0°.

[0063] The dimming sub-pixel 6 includes a first pixel edge 16 extending in the second direction y and a second pixel edge 17 extending in the second direction y. The length of the first pixel edge 16 is b, and the length of the second pixel edge 17 is e.

[0064] Combined with the above formula, for the first extraction part 11, w in the formula is the length w1 of the side of the first extraction part 11 close to the dimming sub-pixel 6 in the direction perpendicular to the plane of the substrate 1, D1 is the length of the first pixel side 16, and D2 is the length of the second pixel side 17, that is, D1 = b, D2 = e. Substituting it into the formula, it can be obtained that: the improvement rate of the light extraction efficiency of the light emitted by the first extraction part 11 to the dimming sub-pixel 6 at 90° is

[0065] For the second extraction portion 12, w in the formula is the length w2 of the side of the second extraction portion 12 close to the dimming sub-pixel 6 in the direction perpendicular to the plane of the substrate 1, D1 is the length of the second pixel side 17, and D2 is the length of the first pixel side 16, that is, D1 = e, D2 = d. Substituting it into the formula, it can be obtained that: the improvement rate of the light extraction efficiency of the light emitted by the second extraction portion 12 to the dimming sub-pixel 6 at 0° is

[0066] Since the length of the side of the light extraction part 4 close to the dimming sub-pixel 6 is usually less than or equal to the length of the pixel side of the dimming sub-pixel 6 close to the light extraction part 4, the lengths of different pixel sides in the dimming sub-pixel 6 will limit the design size of the light extraction part 4.

[0067] For example, when the dimming sub-pixel 6 is a long and narrow rectangle, the length e of the second pixel side 17 is much larger than the length d of the first pixel side 16. At this time, the maximum length of the side of the first extraction portion 11 close to the dimming sub-pixel 6 can be set to d, and the maximum length of the side of the second extraction portion 12 close to the dimming sub-pixel 6 can be set to e. At this time, the difference between η1 and η2 is too large, that is, the degree of improvement of the light output efficiency of the two extraction portions for the light in different orientations emitted by the dimming sub-pixel 6 is too different. This will cause the dimming sub-pixel 6 to have different light output amounts at 90° and 0°, resulting in a brightness difference in the display panel at different viewing angles.

[0068] In this regard, an embodiment of the present invention further provides a display panel, Figure 2 ,like Figure 6 and Figure 7 As shown, Figure 6 Another top view of a display panel provided by an embodiment of the present invention, Figure 7 A structural schematic diagram of the light extraction part 4 provided in an embodiment of the present invention, the display panel includes: a substrate 1; a sub-pixel 2 located on one side of the substrate 1, the sub-pixel 2 including a dimming sub-pixel 6; a dimming structure 3 located on the side of the sub-pixel 2 facing away from the substrate 1, the dimming structure 3 including a plurality of light extraction parts 4 and a high refractive index layer 5. In a direction perpendicular to the plane where the substrate 1 is located, the light extraction part 4 is located on one side of the dimming sub-pixel 6, the edge of the light extraction part 4 close to the dimming sub-pixel 6 is the dimming edge 13, and the dimming edge 13 includes a first oblique edge 14; the high refractive index layer 5 is located on the side of the light extraction part 4 facing away from the substrate 1 and covers the sub-pixel 2 and the extraction part, and the refractive index of the high refractive index layer 5 is greater than the refractive index of the light extraction part 4.

[0069] The light extraction portion 4 includes a first extraction portion 11 and a second extraction portion 12. In a direction perpendicular to the plane of the substrate 1, the first extraction portion 11 is located on one side of the dimming sub-pixel 6 in the first direction x, and the second extraction portion 12 is located on one side of the dimming sub-pixel 6 in the second direction y. The angle between the first oblique side 14 in the first extraction portion 11 and the second direction y is different from the angle between the first oblique side 14 in the second extraction portion 12 and the first direction x. Figure 7 The angle between the first oblique side 14 and the second direction y in the first extraction portion 11 is represented by λ1, and the angle between the first oblique side 14 and the first direction x in the second extraction portion 12 is represented by ε1, and λ1≠ε1.

[0070] It should be noted that the dimming edge 13 of the light extraction part 4 as described above can be understood as the edge on the side of the dimming sub-pixel 6 in the orthographic projection of the light extraction part 4 in the direction perpendicular to the plane where the substrate 1 is located, and can also be understood as the edge on the side of the dimming sub-pixel 6 in the bottom surface of the light extraction part 4 close to the substrate 1.

[0071] When at least part of the dimming edge 13 in the light extraction portion 4 is designed as a bevel edge, as shown in FIG. Figure 8 As shown, Figure 8 An angle schematic diagram provided for an embodiment of the present invention, when light from a certain direction emitted by the dimming sub-pixel 6 irradiates the side of the light extraction part 4, the equivalent typer angle θ0′ corresponding to the light will change relative to the typer angle θ0 of the light extraction part 4 itself, and θ0′ is greater than θ0. When the equivalent typer angle θ0′ changes, d=d(h, θ0, θ1) changes, thereby causing the improvement rate η of the light extraction efficiency of the light extraction part 4 to change. Among them, the inclination degree of the hypotenuse in the dimming edge 13 is different, and the equivalent typer angle θ0′ corresponding to the light is different, and accordingly, the improvement rate η of the light extraction efficiency of the light extraction part 4 is also different.

[0072] In an embodiment of the present invention, by designing the included angle λ1 between the first oblique side 14 and the second direction y in the first extraction portion 11 and the included angle ε1 between the first oblique side 14 and the first direction x in the second extraction portion 12 to be different, the equivalent typer angle θ0′ corresponding to the light at 90° and 0° azimuths emitted by the dimming sub-pixel 6 when transmitted to the light extraction portion 4 can be adjusted, thereby utilizing the influence of the equivalent typer angle θ0′ on the lift rate η to compensate for the influence of the different design sizes of the light extraction portion 4 on the lift rate η, thereby reducing the difference in light regulation between the first extraction portion 11 and the second extraction portion 12, so that the degree of improvement in the light output efficiency of the 90° azimuth light emitted by the dimming sub-pixel 6 by the first extraction portion 11 and the degree of improvement in the light output efficiency of the 0° azimuth light emitted by the dimming sub-pixel 6 by the second extraction portion 12 tend to be consistent, thereby effectively reducing the brightness difference of the display panel at different azimuths and improving color deviation.

[0073] In addition, in the manufacturing process of the display panel, the above structure is adopted, and only the mask pattern used to form the light extraction part 4 needs to be adjusted so that the control edge of the light extraction part 4 has a bevel edge, without adding other complex processes, and the feasibility is higher.

[0074] In one possible implementation, see again Figure 7 The dimming edge 13 further includes a second oblique edge 15. The angle between the second oblique edge 15 and the second direction y in the first extraction portion 11 is different from the angle between the second oblique edge 15 and the first direction x in the second extraction portion 12. Figure 7 The angle between the second oblique side 15 and the second direction y in the first extraction portion 11 is represented by λ2, and the angle between the second oblique side 15 and the first direction x in the second extraction portion 12 is represented by ε2, and λ2≠ε2.

[0075] Taking the first extraction part 11 as an example, by setting at least two oblique edges in the control edge, when the light emitted by the dimming sub-pixel 6 on both sides relative to each other in the second direction y is transmitted to the first extraction part 11, the transmission path and the corresponding equivalent typer angle θ0′ will not be very different. At this time, the first extraction part 11 has a similar degree of control over the 90° light emitted from different positions of the dimming sub-pixel 6, and the brightness uniformity of the display panel is better.

[0076] Further, see again Figure 7 In the first extraction portion 11, the angle between the first hypotenuse 14 and the second direction y is the same as the angle between the second hypotenuse 15 and the second direction y, that is, λ1=λ2; and / or, in the second extraction portion 12, the angle between the first hypotenuse 14 and the first direction x is the same as the angle between the second hypotenuse 15 and the first direction x, that is, ε1=ε2.

[0077] The above structure is more suitable for a light extraction part 4 with a larger volume. For example, when the size of the first extraction part 11 in the second direction y is larger, the inclination of the first hypotenuse 14 and the second hypotenuse 15 can be adjusted to a greater extent, so that the first extraction part 11 can also adjust the light extraction efficiency of the 90° azimuth light emitted by the dimming sub-pixel 6 to a greater extent, which helps to better achieve the uniformity of light output brightness in two directions. Under this premise, it is preferred to design λ1 and λ2 to be the same, and to design ε1 and ε2 to be the same, so as to reduce the design difficulty of the light extraction part 4.

[0078] Or, if Fig. 9 As shown, Fig. 9 Another structural schematic diagram of the light extraction portion 4 provided in an embodiment of the present invention, in the first extraction portion 11, the angle between the first hypotenuse 14 and the second direction y is different from the angle between the second hypotenuse 15 and the second direction y, that is, λ1≠λ2; and / or, in the second extraction portion 12, the angle between the first hypotenuse 14 and the first direction x is different from the angle between the second hypotenuse 15 and the first direction x, that is, ε1≠ε2.

[0079] The above structure is more suitable for a light extraction part 4 with a smaller volume. For example, when the size of the first extraction part 11 in the second direction y is small, the inclination of the first hypotenuse 14 and the second hypotenuse 15 is limited, and it is difficult for λ1 and λ2 to have a large angle. By designing λ1 and λ2 to be different, the difference in the two angles can be used to increase the control range of the first extraction part 11 on the degree of improvement of the light extraction efficiency. Therefore, the embodiment of the present invention can increase the control range of the first extraction part 11 and the second extraction part 12 on the degree of improvement of the light extraction efficiency by designing λ1 and λ2 to be different, and designing ε1 and ε2 to be different, which is more conducive to better achieving the uniformity of light output brightness in two directions.

[0080] In a feasible implementation, in a direction perpendicular to the plane of the substrate 1, when the size of the first extraction portion 11 in the second direction y is greater than the size of the second extraction portion 12 in the first direction x, λ1=λ2 and ε1≠ε2. When the size of the first extraction portion 11 in the second direction y is less than the size of the second extraction portion 12 in the first direction x, λ1≠λ2 and ε1=ε2.

[0081] In addition, if Fig.10 As shown, Fig.10 This is another structural schematic diagram of the light extraction part 4 provided in an embodiment of the present invention. In this embodiment of the present invention, the morphology of the light extraction part 4 can also be changed by adjusting the length of the first hypotenuse 14 and the second hypotenuse 15, thereby increasing the control range of the light extraction part 4 on the improvement rate of the light output efficiency.

[0082] In one possible implementation, see again Figure 7 The dimming sub-pixel 6 includes a first pixel edge 16 extending along the second direction y and a second pixel edge 17 extending along the first direction x, and the length of the first pixel edge 16 is less than the length of the second pixel edge 17. In a direction perpendicular to the plane where the substrate 1 is located, the first extraction portion 11 is located on one side of the first pixel edge 16, and the second extraction portion 12 is located on one side of the second pixel edge 17.

[0083] In the above structure, the dimming sub-pixel 6 is in the shape of a long and narrow rectangle or an approximately rectangular shape, so the brightness uniformity of the dimming sub-pixel 6 at the 90° and 0° orientations is worse. By applying the first extraction unit 11 and the second extraction unit 12 provided in the embodiment of the present invention in the above structure, the final light output of the dimming sub-pixel 6 at the two orientations can be effectively made consistent, thereby effectively optimizing the display effect.

[0084] In one possible implementation, see again Figure 6 , the sub-pixel 2 further includes a non-dimming sub-pixel 18, and the luminous efficiency of the non-dimming sub-pixel 18 may be greater than the luminous efficiency of the dimming sub-pixel 6. At least two dimming sub-pixels 6 are adjacently arranged in the first direction x, the first extraction portion 11 is located between at least two adjacent dimming sub-pixels 6, and in the first direction x, the first extraction portion 11 does not overlap with the non-dimming sub-pixel 18.

[0085] Based on the setting position of the first extraction part 11, the first extraction part 11 is far away from the non-dimming sub-pixel 18. At this time, the first extraction part 11 can only improve the light output efficiency of the dimming sub-pixel 6, but will not improve the light output efficiency of the non-dimming sub-pixel 18, thereby making the life attenuation degree between the dimming sub-pixel 6 and the non-dimming sub-pixel 18 more consistent.

[0086] Further, see again Figure 6 , the first extraction portion 11 is symmetrical along the first symmetry axis 19, and the first symmetry axis 19 extends along the second direction y. In this arrangement, the first extraction portion 11 has a first oblique edge 14 near the dimming edges 13 of the dimming sub-pixels 6 on both sides, so the first extraction portion 11 can effectively regulate the improvement rate of the light output efficiency of the light emitted by the dimming sub-pixels 6 on both sides at a 90° angle. Moreover, the first extraction portion 11 is symmetrically arranged along the first symmetry axis 19, and the first extraction portion 11 improves the light output efficiency of the dimming sub-pixels 6 on both sides to a similar degree, so that the light output brightness of the two dimming sub-pixels 6 tends to be consistent.

[0087] In one possible implementation, see again Figure 6 The sub-pixel 2 further includes a non-dimming sub-pixel 18 . In the second direction y, the dimming sub-pixel 6 overlaps with the non-dimming sub-pixel 18 , and the second extraction portion 12 does not overlap with the non-dimming sub-pixel 18 .

[0088] Based on the setting position of the second extraction part 12, the second extraction part 12 is far away from the non-dimming sub-pixel 18. At this time, the second extraction part 12 can only improve the light output efficiency of the dimming sub-pixel 6, but will not improve the light output efficiency of the non-dimming sub-pixel 18, thereby making the life attenuation degree between the dimming sub-pixel 6 and the non-dimming sub-pixel 18 more consistent.

[0089] Furthermore, if Figure 11 to Figure 14 As shown, Fig.11 Another top view of the display panel provided by the embodiment of the present invention, Fig.12 for Fig.11 The corresponding partial enlarged schematic diagram, Fig.13 Another top view of a display panel provided by an embodiment of the present invention, Fig.14 for Fig.13 Corresponding partial enlarged schematic diagram, the second extraction portion 12 includes a second A extraction portion 20 and a second B extraction portion 21. In the direction perpendicular to the plane where the substrate 1 is located, the size of the second A extraction portion 20 in the first direction x is different from the size of the second B extraction portion 21 in the first direction x. The angle between the first oblique side 14 in the second A extraction portion 20 and the first direction x is different from the angle between the first oblique side 14 in the second B extraction portion 21 and the first direction x. Fig.12 The angle between the first oblique side 14 and the first direction x in the second A extraction portion 20 is represented by ε11, and the angle between the first oblique side 14 and the first direction x in the second B extraction portion 21 is represented by ε12, that is, ε11≠ε12.

[0090] Taking the dimming sub-pixel 6 including the blue sub-pixel 22 and the non-dimming sub-pixel 18 including the red sub-pixel 23 and the green sub-pixel 24 as an example, in a feasible configuration, refer again to Fig.11 and Fig.12 , in the second direction y, some blue sub-pixels 22 overlap with the red sub-pixel 23 and the green sub-pixel 24 respectively, while some sub-pixels 2 overlap only with the green sub-pixel 24. Since different blue sub-pixels 22 overlap with the red sub-pixel 23 and the green sub-pixel 24 in different situations, the second extraction parts 12 on one side of the two blue sub-pixels 22 can be designed to have different sizes, provided that the second extraction parts 12 do not overlap with the red sub-pixel 23 and the green sub-pixel 24 in the second direction y. For example, for the blue sub-pixel 22 that overlaps with the red sub-pixel 23 and the green sub-pixel 24 in the second direction y, the size of the second A extraction part 20 on one side thereof in the first direction x can be set larger, while for the blue sub-pixel 22 that overlaps only with the green sub-pixel 24 in the second direction y, the size of the second B extraction part 21 on one side thereof in the first direction x can be set smaller.

[0091] Since the sizes of the second A extraction section 20 and the second B extraction section 21 in the first direction x are different, the lengths of the sides of the second A extraction section 20 and the second B extraction section 21 close to the dimming sub-pixel 6 are different, which results in a difference in the improvement rate of the light output efficiency of the dimming sub-pixel 6 by the two second extraction sections 12.

[0092] In this regard, the embodiment of the present invention designs the angles between the first hypotenuse 14 and the second direction y in the second A extraction portion 20 and the second B extraction portion 21 to be different. The influence of the equivalent typer angle θ0′ corresponding to the two on the light output efficiency improvement rate η can be used to compensate for the influence of the different sizes of the second A extraction portion 20 and the second B extraction portion 21 on the light output efficiency improvement rate η, thereby making the light output efficiency improvement rates of the two blue sub-pixels 22 at the 0° orientation tend to be consistent, thereby improving the consistency of the light output brightness of different blue sub-pixels 22 at the 0° orientation.

[0093] Or, in another possible setting, see again Fig.13 and Fig.14 , for the blue sub-pixel 22 that overlaps only with the green sub-pixel 24 in the second direction y, in the direction perpendicular to the plane where the substrate 1 is located, the distance between the extension line of the top edge of the blue sub-pixel 22 and the green sub-pixel 24 is different from the distance between the extension line of the bottom edge of the blue sub-pixel 22 and the green sub-pixel 24. When the second A extraction portion 20 is located on the side of the blue sub-pixel 22 close to the top edge, and the second B sub-pixel 2 is located on the side of the blue sub-pixel 22 close to the bottom edge, on the premise that the second extraction portion 12 does not overlap with the red sub-pixel 23 and the green sub-pixel 24 in the second direction y, the sizes of the second A extraction portion 20 and the second B extraction portion 21 in the first direction x can also be set to be different.

[0094] At this time, by designing the included angles between the first oblique side 14 and the second direction y in the second A extraction section 20 and the second B extraction section 21 to be different, the influence of the corresponding equivalent typer angle θ0′ on the light extraction efficiency improvement rate η can be used to compensate for the influence of the different sizes of the second A extraction section 20 and the second B extraction section 21 on the light extraction efficiency improvement rate η. At this time, the degree of improvement of the light extraction efficiency of the light emitted from the two opposite sides of the same blue sub-pixel 22 in the first direction x tends to be consistent, and the brightness uniformity of the display panel is also improved to a certain extent.

[0095] Further, see again Fig.12 , in a direction perpendicular to the plane where the substrate 1 is located, the second light extraction portion 4 is symmetrical along the second symmetry axis 40, and the second symmetry axis 40 extends along the first direction x. At this time, the side of the second extraction portion 12 away from the dimming sub-pixel 6 is also designed as a beveled edge. Compared with the straight edge design, the distance between the second light extraction portion 4 and the non-dimming sub-pixel 18 can be further increased, and the amount of red and green light transmitted to the second extraction portion 12 can be reduced, thereby avoiding the influence of the second extraction portion 12 on the light extraction efficiency of the non-dimming sub-pixel 18, and reducing the difference in the life attenuation of sub-pixels 2 of different colors to a greater extent.

[0096] In a feasible implementation, the sub-pixel 2 includes a red sub-pixel 23, a green sub-pixel 24 and a blue sub-pixel 22, and the dimming sub-pixel 6 includes a blue sub-pixel 22. Affected by the characteristics of the luminescent material, the life decay rate of the blue sub-pixel 22 is relatively fast. In the embodiment of the present invention, by setting the dimming sub-pixel 6 as the blue sub-pixel 22, the light extraction unit 4 can be used to significantly improve the light extraction efficiency of the blue sub-pixel 22, so that the brightness of the blue sub-pixel 22 is significantly improved, and then when the blue sub-pixel 22 is controlled to emit light, the driving current flowing into the blue sub-pixel 22 can be reduced, the life of the blue sub-pixel 22 is extended, and the life decay of the blue sub-pixel 22 is consistent with the life decay of the red sub-pixel 23 and the green sub-pixel 24.

[0097] In a possible implementation, Fig.15 As shown, Fig.15 A schematic diagram of the arrangement of sub-pixels 2 provided in an embodiment of the present invention, the display panel includes a first pixel column 25 and a second pixel column 26 arranged along a second direction y, the first pixel column 25 includes green sub-pixels 24 and red sub-pixels 23 alternately arranged along a first direction x, the second pixel column 26 includes a plurality of blue pixel units 27 arranged along the first direction x, wherein the blue pixel unit 27 includes two blue sub-pixels 22 arranged along the first direction x, and the spacing between the two blue sub-pixels 22 in the blue pixel unit 27 is smaller than the spacing between two adjacent blue pixel units 27.

[0098] In the direction perpendicular to the plane where the substrate 1 is located, the first extraction portion 11 is located between two adjacent blue pixel units 27, and, in the first direction x, the first extraction portion 11 does not overlap with the red sub-pixel 23 and the green sub-pixel 24; in the direction perpendicular to the plane where the substrate 1 is located, the second extraction portion 12 is located on one side of the blue sub-pixel 22 in the second direction y, and, in the second direction y, the second extraction portion 12 does not overlap with the red sub-pixel 23 and the green sub-pixel 24.

[0099] It is understandable that in the process of the display panel, the same color sub-pixel 2 is formed by the same high-precision metal mask (Fine Metal Mask, FMM), and the high-precision metal mask has an opening corresponding to the sub-pixel 2. In general, one opening in the high-precision metal mask corresponds to one sub-pixel 2. However, based on the arrangement of the sub-pixels 2, for the high-precision metal mask used to form the blue sub-pixel 22, a larger opening can be set to correspond to two blue sub-pixels 22 in one blue pixel unit 27 at the same time. At this time, the light-emitting layers in the two blue sub-pixels 22 are continuous, which can effectively reduce the life attenuation of the blue sub-pixel 22.

[0100] Based on the above arrangement, since there is a large spacing between two adjacent blue pixel units 27, setting the first extraction portion 11 between two adjacent blue pixel units 27 can increase the design size of the first extraction portion 11 in the first direction x, and the angle between the first hypotenuse 14 in the first extraction portion 11 and the second direction y can be flexibly set in a wider range, thereby adjusting the light extraction efficiency of the first extraction portion 11 for the blue light emitted at a 90° orientation in a wider range. When the second extraction portion 12 is located on one side of the blue sub-pixel 22 in the second direction y and does not overlap with the red sub-pixel 23 and the green sub-pixel 24 in the second direction y, the second extraction portion 12 can be prevented from affecting the light emission of the red sub-pixel 23 and the green sub-pixel 24, thereby better improving the uniformity of the life attenuation of the three color sub-pixels 2.

[0101] In addition, it should be noted that, in order to further slow down the lifetime decay of the blue sub-pixel 22, the area of ​​the blue sub-pixel 22 can be larger than the areas of the green sub-pixel 24 and the red sub-pixel 23. Fig.15 as shown, or, as Fig.16 As shown, Fig.16 This is another schematic diagram of the arrangement of the sub-pixels 2 provided in an embodiment of the present invention, and the areas of the two sub-pixels may not be equal.

[0102] In addition, it can also be explained that, regarding the relative position relationship between the blue sub-pixel 22 and the green sub-pixel 24 and the red sub-pixel 23, in one configuration, refer again to Fig.15 , the interval between the green sub-pixel 24 and the red sub-pixel 23 has a midline extending along the second direction y, and the two blue sub-pixels 22 in the blue pixel unit 27 can be symmetrically arranged along the midline. In this case, each blue sub-pixel 22 overlaps the green sub-pixel 24 and the red sub-pixel 23 in the second direction y. Alternatively, in another arrangement, see again Fig.16 For two blue sub-pixels 22 in the blue pixel unit 27, one of the blue sub-pixels 22 overlaps the green sub-pixel 24 and the red sub-pixel 23 in the second direction y, and the other blue sub-pixel 22 may only overlap the green sub-pixel 24 in the second direction y.

[0103] In a possible implementation, Fig.17 As shown, Fig.17 Another structural schematic diagram of the light extraction portion 4 provided in an embodiment of the present invention, the dimming edge 13 extends in a broken line. At this time, by controlling the inclination angle of each oblique edge in the dimming edge 13, a wider range of regulation of the improvement of the light output efficiency at 90° and 0° can be achieved.

[0104] Or, in another feasible implementation, as Fig.18 As shown, Fig.18 This is another structural diagram of the light extraction portion 4 provided in an embodiment of the present invention, the dimming edge 13 further includes a straight edge 28 extending along the first direction x or the second direction y, and the straight edge 28 is connected to the first oblique edge 14. Taking the first extraction portion 11 as an example,

[0105] Assuming that the control edge only includes the first bevel 14 and the second bevel 15, if the size of the first extraction portion 11 in the first direction x is small, the inclination degree of the first bevel 14 and the second bevel 15 will be limited, resulting in difficulty in setting a larger angle between the first bevel 14, the second bevel 15 and the second direction y. By designing a straight edge 28 in the dimming edge 13, it is beneficial to design the inclination angle of the bevel in the control edge. For example, compared with the setting method in which the control edge only includes the first bevel 14 and the second bevel 15, when a straight edge 28 is added between the first bevel 14 and the second bevel 15, the two bevels can be tilted at a larger angle by reducing the length of the two bevels.

[0106] Of course, in other optional embodiments of the present invention, the light extraction portion 4 may also be designed in other ways, as long as the angles between the first hypotenuse 14 and the second direction y in the first extraction portion 11 and the second extraction portion 12 are different.

[0107] In a possible implementation, Fig.19 As shown, Fig.19 A cross-sectional view of the light extraction portion 4 provided in an embodiment of the present invention, the light extraction portion 4 includes a bottom surface 29 close to the substrate 1 and a side surface 30 intersecting with the bottom surface 29, and the angle between the side surface 30 and the bottom surface 29 in the first extraction portion 11 is the same as the angle between the side surface 30 and the bottom surface 29 in the second extraction portion 12.

[0108] In this embodiment, only the differentiated design of the hypotenuse angle can be used to improve the uniformity of the light output efficiency at 90° and 0° orientations, without adjusting the angle between the side surface 30 and the bottom surface 29 in different extraction parts. Therefore, only the etching pattern of the light extraction part 4 needs to be adjusted in the process, thereby reducing the process difficulty of the light extraction part 4.

[0109] Based on the same inventive concept, an embodiment of the present invention further provides a display device, such as Fig. 20 As shown, Fig. 20 1 is a schematic diagram of a structure of a display device provided in an embodiment of the present invention, and the display device includes the above-mentioned display panel 100. The specific structure of the display panel 100 has been described in detail in the above-mentioned embodiment, and will not be repeated here. Fig. 20 The display device shown is for illustration only, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a laptop computer, an e-reader or a television.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display panel, characterized in that: include: substrate; A sub-pixel located on one side of the substrate, the sub-pixel comprising a dimming sub-pixel; A dimming structure located on the side of the sub-pixel facing away from the substrate, the dimming structure comprising a plurality of light extraction portions and a high refractive index layer; wherein, on the plane where the substrate is located, the orthographic projection of the light extraction portion is located on one side of the orthographic projection of the dimming sub-pixel, the side of the light extraction portion close to the dimming sub-pixel is a dimming side, and the dimming side comprises a first oblique side; the high refractive index layer is located on the side of the light extraction portion facing away from the substrate and covers the sub-pixel and the extraction portion, and the refractive index of the high refractive index layer is greater than the refractive index of the light extraction portion; The light extraction portion includes a first extraction portion and a second extraction portion, and on the plane where the substrate is located, the orthographic projection of the first extraction portion is located on one side of the orthographic projection of the dimming sub-pixel in the first direction, and the orthographic projection of the second extraction portion is located on one side of the orthographic projection of the dimming sub-pixel in the second direction; An angle between the first oblique side and the second direction in the first extraction portion is different from an angle between the first oblique side and the first direction in the second extraction portion.

2. The display panel according to claim 1, characterized in that: The dimming edge also includes a second oblique edge; An angle between the second oblique side and the second direction in the first extraction portion is different from an angle between the second oblique side and the first direction in the second extraction portion.

3. The display panel according to claim 2, characterized in that: In the first extraction portion, an angle between the first oblique side and the second direction is the same as an angle between the second oblique side and the second direction; And / or, in the second extraction portion, an angle between the first oblique side and the first direction is the same as an angle between the second oblique side and the first direction.

4. The display panel according to claim 2, characterized in that: In the first extraction portion, an angle between the first oblique side and the second direction is different from an angle between the second oblique side and the second direction; And / or, in the second extraction portion, an angle between the first oblique side and the first direction is different from an angle between the second oblique side and the first direction.

5. The display panel according to claim 1, characterized in that: The dimming sub-pixel comprises a first pixel side extending along the second direction and a second pixel side extending along the first direction, wherein the length of the first pixel side is smaller than the length of the second pixel side; On the plane where the substrate is located, the orthographic projection of the first extraction portion is located on one side of the orthographic projection of the first pixel edge, and the orthographic projection of the second extraction portion is located on one side of the orthographic projection of the second pixel edge.

6. The display panel according to claim 1, characterized in that: The sub-pixels also include non-dimming sub-pixels; There are at least two dimming sub-pixels disposed adjacent to each other in the first direction, the first extraction portion is located between at least two adjacent dimming sub-pixels, and the first extraction portion does not overlap with the non-dimming sub-pixel in the first direction.

7. The display panel according to claim 6, characterized in that: The first extraction portion is symmetrical along a first symmetry axis, and the first symmetry axis extends along the second direction.

8. The display panel according to claim 1, characterized in that: The sub-pixel further includes a non-dimming sub-pixel. In the second direction, the dimming sub-pixel overlaps with the non-dimming sub-pixel, and the second extraction portion does not overlap with the non-dimming sub-pixel.

9. The display panel according to claim 8, characterized in that: The second extraction portion includes a second A extraction portion and a second B extraction portion, and on the plane where the substrate is located, a size of an orthographic projection of the second A extraction portion in the first direction is different from a size of an orthographic projection of the second B extraction portion in the first direction; An angle between the first oblique side and the first direction in the second A extraction portion is different from an angle between the first oblique side and the first direction in the second B extraction portion.

10. The display panel according to claim 8, characterized in that: On the plane where the substrate is located, along the first direction, the width of the orthographic projection of the second extraction portion in the second direction first decreases and then increases.

11. The display panel according to claim 1, characterized in that: The sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and the dimming sub-pixel includes the blue sub-pixel.

12. The display panel according to claim 11, characterized in that: The display panel comprises a first pixel column and a second pixel column arranged along the second direction, the first pixel column comprises the green sub-pixels and the red sub-pixels arranged alternately along the first direction, the second pixel column comprises a plurality of blue pixel units arranged along the first direction, wherein the blue pixel unit comprises two blue sub-pixels arranged along the first direction, and a spacing between two blue sub-pixels in the blue pixel unit is smaller than a spacing between two adjacent blue pixel units; On the plane where the substrate is located, the orthographic projection of the first extraction portion is located between the orthographic projections of two adjacent blue pixel units, and in the first direction, the first extraction portion does not overlap with the red sub-pixel and the green sub-pixel; On the plane where the substrate is located, the orthographic projection of the second extraction portion is located on one side of the orthographic projection of the blue sub-pixel in the second direction, and in the second direction, the second extraction portion does not overlap with the red sub-pixel and the green sub-pixel.

13. The display panel according to claim 1, characterized in that: The dimming edge extends in a broken line.

14. The display panel according to claim 1, characterized in that: The dimming edge further includes a straight edge extending along the first direction or the second direction, and the straight edge is connected to the first oblique edge.

15. The display panel according to claim 1, characterized in that: The light extraction portion includes a bottom surface close to the substrate and a side surface intersecting the bottom surface, and an angle between the side surface and the bottom surface in the first extraction portion is the same as an angle between the side surface and the bottom surface in the second extraction portion.

16. A display device, characterized in that: Comprising a display panel as described in any one of claims 1 to 15.

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