Display panel and display device

Abstract

The present application provides a display panel and a display device. The display surface includes a substrate, a driving device layer, and a light-emitting device layer. Among them, the light-emitting device layer includes a pixel defining layer, a first electrode layer, an organic functional layer, and a second electrode layer. The pixel defining layer includes a spacer portion and an opening corresponding to each light-emitting unit. The spacer portion extends around the opening. The area of the first cross-section of the spacer portion decreases in the direction away from the driving device layer. The first cross-section is a cross-section perpendicular to the extending direction of the spacer portion, and the first cross-section has a geometric shape with a tip top. The first electrode layer includes a first electrode disposed in each light-emitting unit. The organic functional layer covers the surface of each first electrode facing away from the driving device layer and the surface of the spacer portion. On the surface of the spacer portion, the covering thickness of the organic functional layer at the tip top is less than the covering thickness of other regions. According to the embodiments of the present application, the problem of light leakage between adjacent light-emitting units in the display panel can be effectively solved.

Description

Technical Field

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

[0002] With the continuous development of display technology, the application of display panels is becoming more and more extensive. OLED (Organic Light Emitting Diode) display panels have become a rising star in the display panel industry with their advantages such as fast response speed, brilliant colors, light weight and convenience.

[0003] Existing OLED display panels often experience the problem of adjacent light-emitting units stealing light during operation. Under normal operating conditions, when a light-emitting unit is illuminated, the adjacent light-emitting units should be completely dark. However, in reality, the light-emitting units that should be completely dark often appear to be slightly illuminated (stealing light), but the brightness is lower than that of the illuminated light-emitting units. This problem often affects the display quality of the display panel.

[0004] In view of this, there is a need to further improve the existing display panels. Summary of the Invention

[0005] In view of the above problems, the present application provides a display panel and a display device to solve the problem of adjacent light-emitting units of the display panel being illuminated secretly in the prior art.

[0006] In a first aspect, an embodiment of the present application provides a display panel, comprising a substrate; a driving device layer, arranged on the substrate, the driving device layer comprising a pixel circuit; a light-emitting device layer, arranged on the side of the driving device layer facing away from the substrate, the light-emitting device layer comprising a plurality of light-emitting units, and the light-emitting units are arranged corresponding to the pixel circuit; the light-emitting device layer comprises a pixel defining layer, a first electrode layer, an organic functional layer, and a second electrode layer, the pixel defining layer comprising a spacer and an opening corresponding to each light-emitting unit, the spacer extending around the opening, the area of a first cross-section of the spacer decreasing in a direction away from the driving device layer, the first cross-section being a cross-section perpendicular to the extension direction of the spacer, the first cross-section presenting a geometric figure with a pointed top, the first electrode layer comprising a first electrode arranged on each light-emitting unit, the organic functional layer coated on a surface of a side of each first electrode facing away from the driving device layer and a surface of the spacer, and on the surface of the spacer, the coating thickness of the organic functional layer at the pointed top is less than the coating thickness of other areas.

[0007] In some embodiments of the first aspect, the plurality of light-emitting units include a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit. The first included angle a1 at the apex between the first light-emitting unit and the second light-emitting unit, the second included angle a2 at the apex between the first light-emitting unit and the third light-emitting unit, and the third included angle a3 at the apex between the second light-emitting unit and the third light-emitting unit satisfy a1≠a3 and a2≠a3.

[0008] In some embodiments of the first aspect, a1, a2, and a3 satisfy the relationship: a1<a3 and a2<a3.

[0009] In some embodiments of the first aspect, the first light-emitting unit is a blue light-emitting unit, the second light-emitting unit is a green light-emitting unit, and the third light-emitting unit is a red light-emitting unit.

[0010] In some embodiments of the first aspect, the vertical distance H1 from the vertex to the bottom of the spacer in the first direction satisfies the relationship: 2*(H2 + H3 + H4)≥H1≥H2 + H3; where H2 is the thickness of the first electrode layer in the first direction, H3 is the thickness of the organic functional layer in the first direction, and H4 is the thickness of the second electrode layer in the first direction.

[0011] In some embodiments of the first aspect, the included angle at the apex is an acute angle.

[0012] In some embodiments of the first aspect, the first cross-section is an isosceles triangle.

[0013] In some embodiments of the first aspect, the covering structure of the organic functional layer in the spacer is a first convex structure, and the second cross-section of the first convex structure is trapezoidal or quasi-trapezoidal, and the second cross-section is parallel to the first cross-section.

[0014] In some embodiments of the first aspect, the first cross-section is a right triangle and the included angle at the apex of the first cross-section is an acute angle, and the bottom and side of the first cross-section are connected at a right angle.

[0015] In some embodiments of the first aspect, the covering structure of the organic functional layer in the spacer is a second convex structure, and the third cross-section of the second convex structure is triangular or quasi-triangular, and the third cross-section is parallel to the first cross-section.

[0016] In some embodiments of the first aspect, the organic functional layer includes a connecting layer and at least two sub-functional layers, and adjacent sub-functional layers are connected by the connecting layer. On the surface of the spacer, the thickness of the connecting layer at the apex is less than the thickness of other regions of the connecting layer.

[0017] In some embodiments of the first aspect, the organic functional layer includes a first functional layer, a light-emitting layer, and a second functional layer sequentially covered in a direction away from the substrate.

[0018] In some embodiments of the first aspect, the first functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer, and the second functional layer includes at least one of a hole blocking layer, an electron transport layer, and an electron injection layer.

[0019] In some embodiments of the first aspect, the display panel further includes a color filter layer, which is coated on the surface of the organic functional layer facing away from the first electrode layer. The color filter layer includes a first filter unit, a second filter unit, and a third filter unit. The orthographic projection of the first filter unit on the organic functional layer is formed within the first light-emitting unit, the orthographic projection of the second filter unit on the organic functional layer is formed within the second light-emitting unit, and the orthographic projection of the third filter unit on the organic functional layer is formed within the third light-emitting unit.

[0020] In a second aspect, the present application provides a display device including the display panel provided in any one of the embodiments of the first aspect above.

[0021] In the display panel and the display device provided by the present application, the tip top is formed on the surface of the spacer of the pixel definition layer between different light-emitting units facing away from the driving device layer, causing the organic functional layer of the display panel to break or thin at the tip top of the spacer, which can prevent the lateral leakage of charges in the organic functional layer when the display panel is working, avoid the phenomenon of light stealing between adjacent light-emitting units of the display panel, and effectively improve the display effect of the display panel.

[0022] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0024] Figure 1 is a schematic structural diagram of a display panel provided by some embodiments of the present application;

[0025] Figure 2 is a schematic structural diagram of the pixel definition layer provided by some embodiments of the present application;

[0026] Figure 3 is a schematic cross-sectional structure diagram of the A-A section of the pixel definition layer provided by some embodiments of the present application;

[0027] Figure 4 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0028] Figure 5 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0029] Figure 6 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0030] Figure 7 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0031] Figure 8 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0032] Figure 9 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0033] Figure 10 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0034] Figure 11 Another schematic diagram of a display panel structure provided by some embodiments of the present application;

[0035] Figure 12 A schematic diagram of a display device provided by some embodiments of the present application.

[0036] The reference numerals in the specific embodiments are as follows:

[0037] 100, light-emitting device layer; 110, light-emitting unit; 111, first light-emitting unit; 112, second light-emitting unit; 113, third light-emitting unit; 10, substrate; 20, driving device layer; 21, pixel circuit; 30, first electrode layer; 40, pixel defining layer; 41, spacer; 42, opening; 50, organic functional layer; 501, first functional layer; 502, light-emitting layer; 503, second functional layer; 510, first sub-functional layer; 520, second sub-functional layer; 530, third sub-functional layer; 60, second electrode layer; 61, spacer column; 70, connection layer; 80, color filter layer; 81, first filter unit; 82, second filter unit; 83, third filter unit; 1000, display device. Specific embodiments

[0038] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0039] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be the ordinary meanings understood by those skilled in the art to which the embodiments of the present application belong.

[0040] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0041] In addition, technical terms such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] With the continuous development of display technology, the application of display panels is becoming more and more extensive. OLED (Organic Light Emitting Diode) display panels have become a rising star in the display panel industry with their advantages such as fast response speed, brilliant colors, light weight and convenience.

[0045] The inventors of this application have noted that, during operation, existing OLED display panels often exhibit a problem where adjacent light-emitting units may be illuminating. Specifically, under normal operating conditions, when a light-emitting unit is illuminated, the adjacent light-emitting units should be completely dark. However, in practice, the light-emitting units that should be completely dark often appear to be slightly illuminated ("stealing light"), but at a lower brightness than the illuminated light-emitting units. This problem often affects the display quality of the display panel.

[0046] The inventors of this application have discovered that the light-emitting layer in the organic functional layer emits light using holes provided by the anode and electrons provided by the cathode. Holes provided to a specific light-emitting unit can leak into another adjacent light-emitting unit via a common layer in the organic functional layer. For example, holes provided to a blue light-emitting unit can laterally leak into a red light-emitting unit or a green light-emitting unit via the common layer. This lateral leakage of charge in the organic functional layer causes adjacent light-emitting units in prior art OLED display panels to emit light in a stealthy manner.

[0047] In order to solve the problems of the prior art, the embodiments of the present application provide a display panel and a display device. The display panel provided by the embodiments of the present application is first introduced below. Figure 1 is a schematic diagram of a display panel structure provided by some embodiments of the present application. Figure 2 is a schematic structural diagram of a pixel definition layer provided in some embodiments of the present application. Figure 3 This is a schematic diagram of the AA cross-sectional structure of the pixel definition layer provided in some embodiments of the present application.

[0048] The display panel includes: a substrate 10; a driving device layer 20 disposed on the substrate 10, the driving device layer 20 including pixel circuits 21; a light-emitting device layer 100 disposed on a side of the driving device layer 20 facing away from the substrate 10, the light-emitting device layer 100 including a plurality of light-emitting units 110, the light-emitting units 110 being correspondingly disposed with the pixel circuits 21; the light-emitting device layer 100 including a pixel defining layer 40, a first electrode layer 30, an organic functional layer 50, and a second electrode layer 60, the pixel defining layer 40 including a spacer portion 41 and openings 42 corresponding to the respective light-emitting units 110, the spacer portion 41 extending around the openings 42, an area of a first cross-section of the spacer portion 41 decreasing in a direction away from the driving device layer 20, the first cross-section being a cross-section perpendicular to an extending direction of the spacer portion 41, the first cross-section being a geometric figure having a pointed top, the first electrode layer 30 including first electrodes disposed on the respective light-emitting units 110, the organic functional layer 50 covering a surface of each first electrode facing away from the driving device layer 20 and a surface of the spacer portion 41, and a covering thickness of the organic functional layer 50 at the pointed top on the surface of the spacer portion 41 being less than a covering thickness of other regions.

[0049] Such as Figure 1 , Figure 2 and Figure 3As shown, the pixel circuit 21 in the driving device layer 20 is used to drive the light-emitting unit 110 in the light-emitting device layer 100 to emit light. The light-emitting device layer 100 includes a pixel defining layer 40, a first electrode layer 30, an organic functional layer 50, and a second electrode layer 60. Among them, the organic functional layer 50 emits light by using the holes provided by the first electrode layer 30 and the electrons provided by the second electrode layer 60. The first electrode layer 30 can be an anode layer, and the second electrode layer 60 can be a cathode layer. The pixel defining layer 40 is used to separate a part of the light-emitting device layer 100 to form a plurality of light-emitting units 110. The pixel defining layer 40 includes a spacer 41 and an opening 42 corresponding to each light-emitting unit 110. The spacer 41 extends around the opening 42. The spacer 41 separates the first electrode layer 30, that is, the first electrode layer 30 in adjacent light-emitting units 110 is separated by the spacer 41 of the pixel defining layer 40. The first electrode layer 30 includes a first electrode disposed in each light-emitting unit 110. The organic functional layer 50 covers the surface of each first electrode facing away from the driving device layer 20 and the surface of the spacer 41. On the spacer 41, the cross-section perpendicular to the extending direction of the spacer 41 is set as the first cross-section. The meaning that the area of the first cross-section of the spacer 41 decreases in the direction away from the driving device layer 20 is that, in the direction parallel to the substrate 10, the width of the top of the spacer 41 in the direction away from the driving device layer 20 is smaller than the width of its bottom. The first cross-section of the spacer 41 has a geometric shape with a pointed top. The meaning that the covering thickness of the organic functional layer 50 at the pointed top of the spacer 41 is smaller than that of other regions is that the organic functional layer 50 thins or breaks at the pointed top of the spacer 41. In the case where the organic functional layer 50 thins at the pointed top of the spacer 41, the resistance at the thinning part is large, which can inhibit the lateral leakage of holes of a specific light-emitting unit 110 through the common layer in the organic functional layer 50 to an adjacent another light-emitting unit 110. The situation where the organic functional layer 50 breaks at the pointed top of the spacer 41 is similar to the above, and will not be elaborated here.

[0050] By setting the spacer 41 in the pixel defining layer 40 to have a structure with a pointed top, the organic functional layer 50 between different light-emitting units 110 of the display panel breaks or thins at the pointed top of the spacer 41, which can effectively inhibit the lateral leakage of charges in the organic functional layer 50 between different light-emitting units 110 when the display panel is working, avoid the occurrence of the phenomenon of light stealing between adjacent light-emitting units 110 of the display panel, and improve the display effect of the display panel.

[0051] In some embodiments, the multiple light-emitting units 110 include a first light-emitting unit 111, a second light-emitting unit 112, and a third light-emitting unit 113. A first angle a1 is formed at the tip top between the first light-emitting unit 111 and the second light-emitting unit 112, a second angle a2 is formed at the tip top between the first light-emitting unit 111 and the third light-emitting unit 113, and a third angle a3 is formed at the tip top between the second light-emitting unit 112 and the third light-emitting unit 113. The relationship satisfied by a1, a2, and a3 is: a1 < a3 and a2 < a3.

[0052] As Figure 5 shown, the first light-emitting unit 111 may be a blue light-emitting unit, the second light-emitting unit 112 may be a green light-emitting unit, and the third light-emitting unit 113 may be a red light-emitting unit. The blue light-emitting unit, the green light-emitting unit, and the red light-emitting unit are only used to illustrate an embodiment of the present application. However, as those skilled in the art will appreciate, the present application is not limited to the above three light-emitting units 110, but can be equally applicable to display panel structures including other numbers and types of light-emitting units 110. Generally, the driving voltage and charge of the blue light-emitting unit are relatively large, and the charge transferred laterally through the common layer of the organic functional layer 50 is relatively large. Compared with the green light-emitting unit and the red light-emitting unit, it is more likely to cause crosstalk light generated by charge lateral leakage between adjacent light-emitting units 110. Therefore, the angle at the tip top of the spacer 41 between the blue light-emitting unit and other light-emitting units 110 is reduced, and the film thickness of the organic functional layer 50 at the tip top is thinned, so that the resistance of the organic functional layer 50 at the tip top increases, alleviating the problem of crosstalk light generated by charge lateral leakage; while the driving voltage and charge of the red light-emitting unit and the green light-emitting unit are relatively small, and the problem of crosstalk light generated by charge lateral leakage is relatively light. Therefore, the angle at the tip top of the spacer 41 between the red light-emitting unit and the green light-emitting unit can be relatively large.

[0053] In the embodiments of the present application, as Figure 6 shown, the top end of the spacer 41 between the blue light-emitting unit and other light-emitting units 110 can be set to have a tip shape, that is, the first cross-section of the spacer 41 is triangular; the top end of the spacer 41 between the red light-emitting unit and the green light-emitting unit can be set to have a trapezoidal or quasi-trapezoidal shape, that is, the first cross-section of the spacer 41 is trapezoidal or quasi-trapezoidal. As described above, the first cross-section is a cross-section perpendicular to the extending direction of the spacer 41. The isolation column 61 can be disposed between the red light-emitting unit and the green light-emitting unit.

[0054] By differentially designing the angles at the top tips of the spacers 41 between different light-emitting units 110, the problem of crosstalk emission caused by lateral charge leakage between different light-emitting units 110 can be more targeted. The angle at the top tip of the spacer 41 is reduced between the light-emitting units 110 with severe lateral charge leakage to strengthen the suppression of lateral charge leakage. The angle at the top tip of the spacer 41 is appropriately increased between the light-emitting units 110 with relatively light lateral charge leakage, which can slow down the influence of the top tip of the spacer 41 on the conductivity of the organic functional layer 50 in the light-emitting unit 110.

[0055] In some embodiments, the vertical distance H1 from the vertex to the bottom of the spacer 41 in the first direction satisfies the relationship: 2*(H2 + H3 + H4) ≥ H1 ≥ H2 + H3; where H2 is the thickness of the first electrode layer 30 in the first direction, H3 is the thickness of the organic functional layer 50 in the first direction, and H4 is the thickness of the second electrode layer 60 in the first direction.

[0056] As Figure 1 and Figure 4 shown, the first direction is the direction perpendicular to the display surface of the display panel. The first electrode layers 30 in adjacent light-emitting units 110 are separated by the spacers 41 of the pixel defining layer 40. The thickness of the spacer 41 in the pixel defining layer 40 in the first direction should be at least the same as the thickness of the organic functional layer 50 to achieve the effect of suppressing the lateral leakage of charges between adjacent light-emitting units 110 through the organic functional layer 50. To sum up, the vertical distance H1 from the vertex to the bottom of the spacer 41 in the first direction needs to satisfy the relationship: H1 ≥ H2 + H3. However, the thickness of the spacer 41 in the pixel defining layer 40 in the first direction should not be too large. If the thickness of the spacer 41 in the first direction is too large, it will affect the operation of other film layers of the display panel. Through the experiments of the inventors of this application, it is proved that in order to avoid affecting the operation of other film layers of the display panel, the thickness of the spacer 41 in the first direction needs to be limited within the range: H1 ≤ 2*(H2 + H3 + H4).

[0057] By the above limitation of the thickness range of the spacer 41 in the pixel defining layer 40 in the first direction, the spacer 41 can effectively suppress the lateral charge leakage between adjacent light-emitting units 110 without affecting the operation of other film layers of the display panel.

[0058] In some embodiments, the included angle at the top tip is an acute angle.

[0059] When the organic functional layer 50 is formed by evaporation coating, the adhesion of the material is small when the tip of the spacer 41 of the pixel defining layer 40 is acute, and the film forming property is poor. Therefore, the tip of the spacer 41 of the pixel defining layer 40 is set to be acute, so that the organic functional layer 50 is more easily thinned at the tip, and the lateral transfer of charges is more effectively suppressed. After the evaporation coating of the organic functional layer 50 is completed, a thinner organic film has been formed at the tip of the spacer 41 of the pixel defining layer 40. When the cathode layer is evaporated, it can adhere well to the organic film, forming a continuous metal thin film, which will not affect the conductivity of the cathode layer.

[0060] In some embodiments, the first cross-section is an isosceles triangle, and the covering structure of the organic functional layer 50 on the spacer 41 is a first convex structure. The second cross-section of the first convex structure is a trapezoid or a trapezoid-like shape, and the second cross-section is parallel to the first cross-section.

[0061] As Figure 4 shown, as described above, the organic functional layer 50 is covered on the surface of each first electrode facing away from the driving device layer 20 and the surface of the spacer 41. When the first cross-section of the spacer 41 is an isosceles triangle, the covering structure of the organic functional layer 50 on the surface of the spacer 41 is an axisymmetric shape. The covering structure of the organic functional layer 50 on the surface of the spacer 41 is a first convex structure with respect to the covering structure of the organic functional layer 50 on the surface of the first electrode facing away from the driving device layer 20. The second cross-section of the first convex structure is a trapezoid or a trapezoid-like shape, and the tip of the organic functional layer 50 on the spacer 41 is in a broken state.

[0062] The spacer 41 is set to the above structure with the first cross-section being an isosceles triangle, so that the covering structure of the organic functional layer 50 on the surface of the spacer 41 is an axisymmetric shape, which is beneficial to the evaporation forming of the organic functional layer 50 and can improve the yield of the display panel.

[0063] In some embodiments, the first cross-section is a right triangle and the included angle at the tip of the first cross-section is an acute angle. The bottom and side of the first cross-section are connected at a right angle. The covering structure of the organic functional layer 50 on the spacer 41 is a second convex structure. The third cross-section of the second convex structure is a triangle or a triangle-like shape, and the third cross-section is parallel to the first cross-section.

[0064] As Figure 7 and Figure 8 shown, when the first cross-section of the spacer 41 is a right triangle, the first right side of the right triangle is arranged in the first direction, the first direction is the direction perpendicular to the display surface of the display panel, and the second right side of the right triangle is arranged perpendicular to the extending direction of the spacer 41. The organic functional layer 50 is covered on the surface of the hypotenuse of the spacer 41, and the tip of the organic functional layer 50 on the spacer 41 is in a thinned state.

[0065] The first right-angled side can more effectively block the lateral conduction of charges in the organic functional layer 50. That is to say, even if the organic functional layer 50 is not completely broken at the tip top of the spacer 41, the lateral leakage of charges in the organic functional layer 50 can be effectively inhibited. Since the organic functional layer 50 is not completely broken at the tip top of the spacer 41, the influence of the spacer 41 on the conductivity of the organic functional layer 50 is small, which further improves the display effect of the display panel. At the same time, by setting the spacer 41 into a structure with a right-angled triangle cross-section at the first section, the use of the production material of the pixel defining layer 40 can be reduced, and the manufacturing cost of the display panel can be lowered.

[0066] In some embodiments, the organic functional layer 50 includes a connection layer 70 and at least two sub-functional layers, and the adjacent sub-functional layers are connected by the connection layer 70. On the surface of the spacer 41, the thickness of the connection layer 70 at the tip top is less than the thickness of the connection layer 70 in other regions.

[0067] In the embodiments of the present application, the design of the spacer 41 in the pixel defining layer 40 can also be applied to a tandem OLED display panel, such as Figure 9 As shown, in the tandem OLED display panel of the embodiments of the present application, the organic functional layer 50 includes a connection layer 70, a first sub-functional layer 510, a second sub-functional layer 520, and a third sub-functional layer 530. Among them, the structure and function of each sub-functional layer are the same as those of the organic functional layer, and the adjacent sub-functional layers are connected by the connection layer 70. The connection layer 70 can be a charge generation layer. In the tandem OLED display panel, the lateral leakage of charges in the charge generation layer is relatively serious. On the surface of the spacer 41, the meaning that the thickness of the charge generation layer at the tip top is less than the thickness of the connection layer 70 in other regions is that the charge generation layer is thinned or broken at the tip top of the spacer 41 to avoid the lateral leakage of charges in the charge generation layer.

[0068] By setting the spacer 41 in the pixel defining layer 40 into a structure with a tip top, the connection layer 70 between different light-emitting units 110 in the tandem OLED display panel is broken or thinned at the tip top of the spacer 41, which can effectively inhibit the lateral leakage of charges in the charge generation layer between different light-emitting units 110 when the tandem OLED display panel works, and avoid the occurrence of the phenomenon of light stealing between adjacent light-emitting units 110 in the tandem OLED display panel, and improve the display effect of the tandem OLED display panel.

[0069] In some embodiments, the organic functional layer 50 includes a first functional layer 501, a light-emitting layer 502, and a second functional layer 503 that are sequentially coated in a direction away from the substrate 10. The first functional layer 501 includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer. The second functional layer 503 includes at least one of a hole blocking layer, an electron transport layer, and an electron injection layer.

[0070] As Figure 10 shown, the composite layer of the first functional layer 501, the light-emitting layer 502, and the second functional layer 503 serves as the organic functional layer 50 of the display panel. Among them, the light-emitting layer 502 varies according to the different light-emitting types of the sub-pixels. The first functional layer 501 is disposed between the first electrode layer 30 and the light-emitting layer 502. The first functional layer 501 includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer. The function of the hole transport layer is to enable the holes provided by the anode layer to be efficiently transported into the light-emitting layer 502. The function of the hole injection layer is to improve the energy level matching problem between the anode layer and the hole transport layer. The energy levels of the commonly used hole transport layer materials do not match those of the ITO layer in the anode layer, resulting in low hole transport efficiency. Therefore, by providing a hole injection layer, the injection barrier between the anode layer and the hole transport layer is reduced, assisting the holes to be injected from the ITO layer into the hole transport layer. Similarly, the function of the electron injection layer is to improve the energy level matching problem between the cathode layer and the electron transport layer. However, in other embodiments of the present application, when the injection barrier between the anode layer and the hole transport layer is small, the hole injection layer can be omitted. Similarly, when the injection barrier between the cathode layer and the electron transport layer is small, the electron injection layer can also be omitted. The present application does not make a limitation on this, and it depends on the specific situation. The function of the electron blocking layer is to prevent the electrons in the light-emitting layer 502 from entering the anode layer. Similarly, the function of the hole blocking layer is to prevent the holes in the light-emitting layer 502 from entering the cathode layer.

[0071] By providing a hole injection layer and an electron injection layer in the organic functional layer 50, the transport efficiency of holes and electrons in the display panel can be improved, thereby improving the display effect of the display panel. By providing a hole blocking layer and an electron blocking layer in the organic functional layer 50, the anode layer can be prevented from failing due to the entry of electrons and the cathode layer can be prevented from failing due to the entry of holes, improving the service life and stability of the display panel.

[0072] In some embodiments, the display panel further includes a color filter layer 80, which is coated on the surface of the organic functional layer 50 facing away from the first electrode layer 30. The color filter layer 80 includes a first filter unit 81, a second filter unit 82, and a third filter unit 83. The orthographic projection of the first filter unit 81 on the organic functional layer 50 is formed within the first light-emitting unit 111, the orthographic projection of the second filter unit 82 on the organic functional layer 50 is formed within the second light-emitting unit 112, and the orthographic projection of the third filter unit 83 on the organic functional layer 50 is formed within the third light-emitting unit 113.

[0073] As Figure 11 shown, the filter unit is the same as the light-emitting unit 110 in the embodiments of the present application. The first filter unit 81 may be a blue filter unit, the second filter unit 82 may be a green filter unit, and the third filter unit 83 may be a red filter unit. The meaning that the orthographic projection of the first filter unit 81 on the organic functional layer 50 is formed within the first light-emitting unit 111 is that the first filter unit 81 corresponds to the first light-emitting unit 111, that is, the blue filter unit corresponds to the blue light-emitting unit. The blue filter unit can further filter out the light components of other colors emitted by the blue light-emitting unit except blue, so that the wavelength range of the light emitted by the blue light-emitting unit is smaller. Similarly, the green filter unit makes the wavelength range of the light emitted by the green light-emitting unit smaller, and the red filter unit makes the wavelength range of the light emitted by the red light-emitting unit smaller.

[0074] By providing the color filter layer 80 in the display panel, the light components that are not expected to be emitted in each light-emitting unit 110 can be further filtered out, so that the wavelength ranges of the light emitted by the first light-emitting unit 111, the second light-emitting unit 112, and the third light-emitting unit 113 are smaller, thereby further increasing the color gamut of the display panel and improving the display effect of the display panel.

[0075] Based on the display panel provided by the above embodiments of the present application, the embodiments of the present application further provide a display device 1000, which includes the display panel provided by any of the above embodiments.

[0076] As Figure 12 shown, the display device 1000 provided by the present application may be any device including the display panel as described above, including but not limited to mobile phones, tablet computers, computer monitors, displays applied to smart wearable devices, display devices applied to vehicles such as cars, and so on. As long as the display device includes the structure of the display panel disclosed in the present application, it is considered to fall within the protection scope of the present application.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A display panel, characterized in that, Comprising: A substrate; A driving device layer disposed on the substrate, the driving device layer including pixel circuits; A light-emitting device layer disposed on a side of the driving device layer facing away from the substrate, the light-emitting device layer including a plurality of light-emitting units, the light-emitting units being correspondingly disposed with the pixel circuits; The light-emitting device layer includes a pixel definition layer, a first electrode layer, an organic functional layer, and a second electrode layer. The pixel definition layer includes a spacer portion and openings corresponding to the respective light-emitting units. The spacer portion extends around the openings. The area of a first cross-section of the spacer portion decreases in a direction away from the driving device layer. The first cross-section is a cross-section perpendicular to the extending direction of the spacer portion, and the first cross-section has a geometric shape with a pointed top. The first electrode layer includes first electrodes disposed on the respective light-emitting units. The organic functional layer covers a surface of each first electrode facing away from the driving device layer and a surface of the spacer portion. On the surface of the spacer portion, the covering thickness of the organic functional layer at the pointed top is less than the covering thickness of other regions; Wherein, the plurality of light-emitting units include a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit. A first included angle a1 of the pointed top between the first light-emitting unit and the second light-emitting unit, a second included angle a2 of the pointed top between the first light-emitting unit and the third light-emitting unit, and a third included angle a3 of the pointed top between the second light-emitting unit and the third light-emitting unit, a1≠a3 and a2≠a3.

2. The display panel according to claim 1, wherein The a1, a2, and a3 satisfy the relationship: a1<a3 and a2<a3.

3. The display panel according to claim 1, characterized in that, The first light-emitting unit is a blue light-emitting unit, the second light-emitting unit is a green light-emitting unit, and the third light-emitting unit is a red light-emitting unit.

4. The display panel according to claim 1, wherein, The vertical distance H1 from the vertex to the bottom of the spacer portion in a first direction satisfies the relationship: 2*(H2 + H3 + H4)≥H1≥H2 + H3; Wherein, H2 is the thickness of the first electrode layer in the first direction, H3 is the thickness of the organic functional layer in the first direction, and H4 is the thickness of the second electrode layer in the first direction.

5. The display panel according to claim 1, wherein The included angle of the pointed top is an acute angle.

6. The display panel according to claim 1, wherein The first cross-section is an isosceles triangle.

7. The display panel according to claim 6, wherein The covering structure of the organic functional layer on the spacer portion is a first convex structure, and a second cross-section of the first convex structure is trapezoidal or quasi-trapezoidal, and the second cross-section is parallel to the first cross-section.

8. The display panel according to claim 1, wherein, The first cross-section is a right triangle and the included angle of the pointed top of the first cross-section is an acute angle, and the bottom and side of the first cross-section are connected at a right angle.

9. The display panel according to claim 8, wherein, The covering structure of the organic functional layer on the spacer portion is a second convex structure, and a third cross-section of the second convex structure is triangular, and the third cross-section is parallel to the first cross-section.

10. The display panel according to claim 1, wherein The organic functional layer includes a connecting layer and at least two sub-functional layers, and adjacent sub-functional layers are connected by the connecting layer. On the surface of the spacer portion, the thickness of the connecting layer at the pointed top is less than the thickness of other regions of the connecting layer.

11. The display panel according to claim 1, wherein The organic functional layer includes a first functional layer, a light-emitting layer, and a second functional layer that are sequentially coated in a direction away from the substrate.

12. The display panel according to claim 11, wherein, The first functional layer includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer, and the second functional layer includes at least one of a hole blocking layer, an electron transport layer, and an electron injection layer.

13. The display panel according to claim 1, characterized in that, The display panel further includes a color filter layer that is coated on a surface of the organic functional layer facing away from the first electrode layer. The color filter layer includes a first filter unit, a second filter unit, and a third filter unit. A front projection of the first filter unit on the organic functional layer is formed within the first light-emitting unit, a front projection of the second filter unit on the organic functional layer is formed within the second light-emitting unit, and a front projection of the third filter unit on the organic functional layer is formed within the third light-emitting unit.

14. A display device, comprising the display panel according to any one of claims 1-13.

Images