Display panel and manufacturing method thereof

Abstract

The present invention provides a display panel and a method for manufacturing the same. The display panel includes a display area, the display area comprising a light-emitting area and a non-light-emitting area. The display area includes a first display area, the light-emitting area of ​​the first display area comprising a stacked anode, a light-emitting layer, a first electron transport layer, a patterned second electron transport layer, and a first cathode, the first cathode and the second electron transport layer having the same pattern. The first display area of ​​the display panel provided by the present invention has a high transmittance.

Description

Technical Field

[0001] The present invention belongs to the technical field of display panels, and particularly relates to a display panel and a method for preparing the same. Background Art

[0002] With the continuous development of display technology, consumers' requirements for display panels are constantly increasing. Various types of display panels have emerged and have developed rapidly, such as liquid crystal display panels, organic light-emitting display panels, etc. On this basis, display technologies such as 3D display, touch display technology, curved display, ultra-high resolution display and anti-peep display are constantly emerging to meet consumer needs.

[0003] In addition, in recent years, more and more functions have been gradually integrated into display panels, such as fingerprint recognition, light-sensitive touch, face recognition or iris recognition. However, functions such as fingerprint recognition and face recognition require light to pass through the display panel and illuminate the sensing device installed on the backlight surface of the display panel. This requires the display panel to have a sufficiently high light transmittance. However, in the current display panels, the entire cathode is covered in the light-emitting area of ​​the panel. In order to utilize the microcavity effect, the cathode transmittance is usually only 50% to 60%, and the effect of transparent display cannot be achieved, resulting in a low light transmittance of the display panel. Therefore, how to provide a display panel with high light transmittance is a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0004] In view of this, the present invention provides a display panel and a method for manufacturing the same, wherein a cathode in a specific area is patterned by disposing a first electron transport layer and a patterned second electron transport layer, thereby improving the light transmittance of the display panel.

[0005] In a first aspect, the present invention provides a display panel, comprising a display area, wherein the display area comprises a light-emitting area and a non-light-emitting area;

[0006] The display area includes a first display area, and the light-emitting area of ​​the first display area includes a stacked anode, a light-emitting layer, a first electron transport layer, a patterned second electron transport layer and a first cathode, and the pattern of the first cathode is the same as that of the second electron transport layer.

[0007] In the present invention, the first cathode and the second electron transport layer have the same pattern, which means that the first cathode formed after metal is deposited on the surface of the patterned second electron transport layer covers the surface of the patterned second electron transport layer.

[0008] In another aspect, the present invention provides a method for manufacturing a display panel according to the first aspect, the method comprising the following steps:

[0009] (1) performing evaporation deposition on one side of the anode to obtain the light-emitting layer;

[0010] (2) performing vapor deposition on the side of the light-emitting layer obtained in step (1) away from the anode to obtain the first electron transport layer in the first display area;

[0011] (3) performing vapor deposition on the side of the first electron transport layer obtained in step (2) away from the light-emitting layer to obtain the patterned second electron transport layer;

[0012] (4) The patterned second electron transport layer obtained in step (3) is evaporated on a side away from the light-emitting layer to form the first cathode, thereby obtaining the display panel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In the present invention, by designing the structure of the display panel, the first electron transport layer and the patterned second electron transport layer, the second cathode of the non-luminous area of ​​the first display area is patterned, thereby improving the transmittance of the first display area of ​​the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a top view of the first display area in a specific embodiment provided by the present invention;

[0016] Figure 2 It is along Figure 1 A cross-sectional view of an example taken along line II;

[0017] Figure 3 It is along Figure 1 along the line II-II or Figure 5 A cross-sectional view of an example taken along line IV-IV;

[0018] Figure 4 This is a schematic structural diagram of a light-emitting area in a first display area of ​​a display panel provided by the present invention;

[0019] Figure 5 is a top view of the first display area in another specific embodiment provided by the present invention;

[0020] Figure 6 It is along Figure 5 A cross-sectional view of an example taken along line III-III;

[0021] Figure 7 Schematic diagram of the structure of the fourth electron transport layer;

[0022] Figure 8 This is a schematic diagram of the structure of the fourth electron transport layer after evaporation of the second cathode;

[0023] Figure 9 Schematic diagram of a structure in which the second cathode completely overlaps with the lines connecting the geometric centers of two adjacent first cathodes;

[0024] Figure 10 Schematic diagram of a structure in which the second cathode partially overlaps with the line connecting the geometric centers of two adjacent first cathodes;

[0025] Figure 11 It is along Figure 10 A cross-sectional view of an example taken along a line connecting the geometric centers of two adjacent first cathodes;

[0026] Figure 12 is a structural schematic diagram in which the width of the second cathode is equal to the width of the first cathode;

[0027] Figure 13 is a structural schematic diagram in which the width of the second cathode is greater than the width of the first cathode;

[0028] Figure 14 is a top view of the second display area in a specific embodiment provided by the present invention;

[0029] Figure 15 It is along Figure 14 A cross-sectional view of an example taken along line VV or line VI-VI;

[0030] Figure 16 is a top view of the manufacturing process of the display panel provided by the present invention;

[0031] Figure 17 is a schematic diagram of the anatomical structure of the first electron transport layer prepared in step (2);

[0032] Figure 18 is a schematic diagram of the anatomical structure of the second electron transport layer prepared in step (3);

[0033] Figure 19 is a schematic diagram of the anatomical structure of the first cathode prepared in step (4);

[0034] Figure 20 This is a schematic diagram of the preparation process of the first display area in a specific embodiment provided by the present invention;

[0035] Figure 21 This is a schematic diagram of the preparation process of the first display area in another specific embodiment provided by the present invention;

[0036] Among them, 1-substrate, 2-anode, 3-light-emitting layer, 4-first electron transport layer, 5-patterned second electron transport layer, 6-first cathode, 7-patterned third electron transport layer, 8-second cathode, 9-patterned fourth electron transport layer, 10-first spacer, 11-third cathode;

[0037] 31-hole injection layer, 32-hole transport layer, 33-organic light-emitting layer;

[0038] A-bank, B-line connecting the geometric centers of two adjacent first cathodes. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described below with reference to the accompanying drawings.

[0040] It should be noted that specific details are set forth in the following description to facilitate a thorough understanding of the present invention, but the present invention can be implemented in many other ways than those described herein.

[0041] One aspect of the present invention provides a display panel, comprising a display area, wherein the display area comprises a light-emitting area and a non-light-emitting area.

[0042] In a specific embodiment, the display panel includes a first display area, Figure 1 is a top view of the first display area, Figure 2 It is along Figure 1 A cross-sectional view of an example taken along line II of FIG. Figure 3 It is along Figure 1 A cross-sectional view of an example taken along line II-II.

[0043] Depend on Figure 1-3 It can be seen that the light-emitting area P1 of the first display area provided by the present invention includes an anode 2, a light-emitting layer 3, a first electron transport layer 4, a patterned second electron transport layer 5 and a first cathode 6 stacked on one side of the substrate 1; the non-light-emitting area P2 of the first display area includes a first electron transport layer 4, a patterned third electron transport layer 7 and a second cathode 8 stacked in sequence, and the second cathode 8 is electrically connected to the first cathode 6.

[0044] In the present invention, the top view of the first display area is as follows Figure 1 As shown, a first electrode 6 and a second cathode 8 are included, and the first cathode 6 and the second cathode 8 are electrically connected. Figure 1 In the figure, the dotted box area represents the patterned second electron transport layer 5, and the first cathode 6 completely covers the surface of the patterned second electron transport layer 5. Therefore, the pattern of the first cathode 6 is the same as that of the second electron transport layer 5.

[0045] In the process of manufacturing the first display area, since the first electron transport layer 4 is prepared from an organic material having a metal-phobic property, metal atoms cannot be deposited on its surface. Therefore, in the process of manufacturing the display panel, metal cannot be deposited on the surface of the first electron transport layer 4 to form a cathode. In the present invention, a patterned second electron transport layer 5 is provided on one side of the first electron transport layer 4, so that metal can be deposited on the side of the patterned second electron transport layer 5 away from the first electron transport layer 4 to form a first cathode 6. Therefore, in the present invention, the pattern of the first cathode 6 is the same as that of the second electron transport layer 5, which means that the first cathode 6 formed after the metal is deposited on the surface of the patterned second electron transport layer 5 covers the surface of the patterned second electron transport layer 5, that is, the first cathode 6 has the same pattern as the second electron transport layer 5.

[0046] Similarly, in the non-luminescent area of ​​the first display region, the second cathode 8 completely covers the surface of the patterned third electron transport layer 7 . Therefore, the pattern of the second cathode 8 is the same as that of the third electron transport layer 7 .

[0047] In the present invention, by designing the first cathode 6 to have the same pattern as the second electron transport layer 5, and designing the second cathode 8 to have the same pattern as the third electron transport layer 7, the second cathode 8 does not completely cover the non-luminous area of ​​the first display area, thereby improving the light transmittance of the first display area.

[0048] Depend on Figure 2 and Figure 3 As can be seen, the substrate 1 is provided with a bank A, which covers the edge of the anode 2 and separates two adjacent anodes 2. In the present invention, the opening area without the bank A is the light-emitting area P1, and the non-opening area with the bank A is the non-light-emitting area P2.

[0049] The light-emitting layer 3 is arranged on the side of the anode 2 away from the substrate 1. The light-emitting layer 3 includes a hole injection layer, a hole transport layer and an organic light-emitting layer stacked in sequence, wherein the hole injection layer is located between the anode 2 and the hole transport layer.

[0050] like Figure 4 As shown, in the present invention, the light-emitting area of ​​the first display area includes a substrate 1, an anode 2, a hole injection layer 31, a hole transport layer 32, an organic light-emitting layer 33, a first electron transport layer 4, a patterned second electron transport layer 5 and a first cathode 6 which are stacked in sequence.

[0051] In another specific embodiment, the display panel includes a first display area, Figure 5 is a top view of the first display area, Figure 6 It is along Figure 1 A cross-sectional view of an example taken along line III-III Figure 4 An example cross-sectional view taken along line IV-IV is shown above. Figure 3 shown.

[0052] From 5-6 and Figure 3 It can be seen that the light-emitting area P1 of the first display area provided by the present invention includes an anode 2, a light-emitting layer 3, a first electron transport layer 4, a patterned second electron transport layer 5 and a first cathode 6 stacked on a substrate 1; the non-light-emitting area P2 of the first display area includes a patterned fourth electron transport layer 9 and a second cathode 8 stacked in sequence, and the second cathode 8 is electrically connected to the first cathode 6.

[0053] Depend on Figure 5 It can be seen that in another embodiment provided by the present invention, the first display area includes a first cathode 6, a second cathode 8 and a patterned fourth electron transport layer 9, wherein the first cathode 6 and the second cathode 8 are electrically connected. Figure 5 In the figure, the dotted box area represents the patterned second electron transport layer 5, and the first cathode 6 completely covers the surface of the patterned second electron transport layer 5. Therefore, the pattern of the first cathode 6 is the same as that of the second electron transport layer 5; the second cathode 8 fills the non-patterned area of ​​the patterned fourth electron transport layer 9, and finally the second cathode 8 and the patterned fourth electron transport layer 9 jointly cover the non-luminous area of ​​the first display area. Therefore, the second cathode 8 and the patterned fourth electron transport layer 9 are complementary.

[0054] The structural diagram of the patterned fourth electron transport layer 9 in the non-luminescent area of ​​the first display area is as follows: Figure 7 As shown. Figure 7 It can be seen that the patterned fourth electron transport layer 9 is not provided at the positions of the first cathode 6 and the second cathode 8. After the second cathode 8 is evaporated in the non-luminous area of ​​the first display area, the structural diagram thereof is as follows: Figure 8 As shown by Figure 8 It can be seen that the second cathode 8 fills the non-patterned area of ​​the patterned fourth electron transport layer 9 in the non-luminous area of ​​the first display area. Finally, the second cathode 8 and the patterned fourth electron transport layer 9 jointly cover the non-luminous area of ​​the first display area, that is, the second cathode 8 and the patterned fourth electron transport layer 9 complement each other.

[0055] In one embodiment, Figure 1 As shown, the second cathode 8 is located between two adjacent first cathodes 6. Along the first direction, the width of the second cathode 8 is smaller than the width of the first cathode 6. The first direction is perpendicular to the direction of the line connecting the two first cathodes 6 and parallel to the plane where the display panel is located.

[0056] In one embodiment, the second cathode 8 at least partially overlaps with a line connecting the geometric centers of two adjacent first cathodes 6 .

[0057] In a specific embodiment, the schematic diagram of the top view structure of the first display area is as follows: Figure 9 As shown, the dotted line represents the line connecting the geometric centers of two adjacent first cathodes 6. As can be seen from the figure, the second cathode 8 completely overlaps with the line connecting the geometric centers of two adjacent first cathodes 6. Figure 2 As shown. By combining Figure 10 and Figure 2 It can be seen that at the dotted line, the second cathode 8 completely covers the line connecting the geometric centers of two adjacent first cathodes 6, so as to electrically connect the two adjacent cathodes.

[0058] In another specific embodiment, the schematic diagram of the top view structure of the first display area is as follows: Figure 10 As shown, the dotted line represents the line connecting the geometric centers of two adjacent first cathodes 6, Figure 10 It can be seen that the second cathode 8 partially overlaps with the line connecting the geometric centers of the two adjacent first cathodes 6. The cross-sectional structure diagram at the dotted line is as follows: Figure 11 As shown by Figure 11 It can be seen that in the non-luminous area, the second cathode 8 is not continuous, which means that the second cathode 8 partially covers the line connecting the geometric centers of two adjacent first cathodes 6 .

[0059] In the present invention, the second cathode 8 is electrically connected to the two adjacent first cathodes 6 by controlling the second cathode 8 to at least partially overlap the line connecting the geometric centers of the two adjacent first cathodes 6 .

[0060] In one embodiment, Figure 12 As shown, the second cathode 8 is located between two adjacent first cathodes 6. Along a second direction, the width of the second cathode 8 is equal to the width of the first cathode 6. The second direction is perpendicular to the direction connecting the two first cathodes 6 and parallel to the plane of the display panel. Along the second direction, two adjacent second cathodes 8 include a first spacer 10. The first spacer 10 is located in the non-luminous area 2 of the first display area.

[0061] In another embodiment, the top view of the first display area is as follows: Figure 13 As shown, along the second direction, the width of the second cathode 8 is greater than the width of the first cathode 6. The second direction is perpendicular to the direction of the line connecting the two first cathodes 6 and parallel to the plane of the display panel. Along the second direction, two adjacent second cathodes 8 include a first gap 10.

[0062] In the present invention, along the second direction, regardless of whether the width of the second cathode 8 is equal to the width of the first cathode 6 or the width of the second cathode 8 is greater than the width of the first cathode 6, a first gap 10 is provided between the two cathodes. Since the first gap 10 is located in the non-luminous area of ​​the first display area and the second cathode 8 does not cover the first gap 10, light can pass through the first gap 10 area, thereby improving the light transmittance of the first display area.

[0063] In a specific embodiment, the display panel includes a second display area, Figure 14 is a top view of the second display area, Figure 15 It is along Figure 1 Cross-sectional views taken along line VV and line VI-VI.

[0064] Depend on Figure 14 and Figure 15 It can be seen that the light-emitting area of ​​the second display area includes an anode 2, a light-emitting layer 3, a patterned second electron transport layer 5 and a third cathode 11 stacked on a substrate 1; the non-light-emitting area P2 of the second display area includes the third cathode 11.

[0065] Figure 14 3 is a top view of the second display area, wherein the dotted box area represents the patterned second electron transport layer 5 . Figure 14 In the cross-sectional view taken along line VV and line VI-VI, the third cathode 11 covers the light-emitting area and the non-light-emitting area. Figure 14 and Figure 15 It can be seen that the third cathode 11 completely covers the second display area. Therefore, the light transmittance of the second display area is relatively low.

[0066] In the display panel provided by the present invention, in the non-luminous area of ​​the first display area, the second cathode 8 is used to electrically connect the first cathode 6 of the luminous area of ​​the first display area, and the second cathode 8 does not completely cover the non-luminous area of ​​the first display area. Therefore, light can pass through the non-luminous area of ​​the first display area, so that the first display area has a higher light transmittance; in the second display area of ​​the display panel, the third cathode 11 completely covers the luminous area and non-luminous area of ​​the second display area, resulting in a lower light transmittance in the second display area, so the transmittance of the second display area is less than the transmittance of the first display area.

[0067] In one embodiment, the material of the first electron transport layer 4 and the material of the patterned fourth electron transport layer 9 both include fluorine-containing compounds;

[0068] The fluorine-containing compound has a structure as shown in Formula I:

[0069]

[0070] wherein R1 and R2 are each independently selected from a substituted or unsubstituted C1-C20 straight or branched aliphatic group, a substituted or unsubstituted C3-C30 cycloalkane group, a substituted or unsubstituted C5-C60 aryl group, or a substituted or unsubstituted C5-C60 heteroaryl group;

[0071] The substituents in R1 and R2 are selected from at least one of a fluorine atom and a trifluoromethyl group;

[0072] One hydrogen atom in the fluorine-containing compound of formula I may be substituted by a fluorine atom and / or a trifluoromethyl group.

[0073] In the present invention, the C1 to C20 may be C1, C2, C4, C6, C8, C10, C12, C14, C16, C18 or C20, etc.

[0074] The C3 to C30 may be C3, C4, C6, C8, C10, C12, C15, C18, C20, C24 or C30, etc.

[0075] The C6 to C60 may be C6, C8, C10, C15, C20, C30, C42, C50 or C60, etc.

[0076] The first electron transport layer 4 and the patterned fourth electron transport layer 9 formed of the fluorine-containing compound provided by the present invention have a metal-phobic property, and metal cannot be deposited on their surfaces.

[0077] In one embodiment, R1 and R2 are each independently selected from

[0078] Any of the following;

[0079] The dotted lines represent the attachment sites of the groups.

[0080] In one embodiment, the fluorine-containing compound is selected from any one of the following compounds:

[0081] In a second aspect, the present invention provides a method for manufacturing a display panel as described in the first aspect, wherein a top view of the component structure during the manufacturing process is shown in FIG. Figure 16 As shown, the preparation method comprises the following steps:

[0082] (1) performing evaporation deposition on one side of the anode 2 to obtain the light-emitting layer 3;

[0083] (2) The light-emitting layer 3 obtained in step (1) is evaporated on the side away from the anode 2 to obtain the first electron transport layer 4 in the first display area; the anatomical structure diagram thereof is shown in FIG. Figure 17As shown:

[0084] (3) The first electron transport layer 4 obtained in step (2) is evaporated on the side away from the light-emitting layer 3 to obtain the patterned second electron transport layer 5; the schematic diagram of its anatomical structure is as follows Figure 18 As shown:

[0085] (4) The patterned second electron transport layer 5 obtained in step (3) is evaporated on the side away from the light-emitting layer 3 to form the first cathode 6, thereby obtaining the display panel. Figure 19 As shown:

[0086] In a specific embodiment, the non-luminescent region of the first display region includes a first electron transport layer 4, a patterned third electron transport layer 7 and a second cathode 8. The top view of the first display region is as shown above. Figure 1 As shown, along Figure 1 A cross-sectional view of an example taken along line II is shown in FIG. Figure 2 As shown, the preparation process diagram of the cross section taken along line II is as follows Figure 20 As shown, the preparation method of the first display area includes the following steps:

[0087] (S1) performing evaporation deposition on one side of the anode 2 to form a light-emitting layer 3 in the light-emitting area of ​​the first display area;

[0088] (S2) vapor-depositing a fluorine-containing compound on a side of the light-emitting layer 3 away from the anode 2 to form a first electron transport layer 1 in the light-emitting area of ​​the first display area and the non-light-emitting area of ​​the first display area;

[0089] (S3) performing evaporation deposition on a side of the first electron transport layer 4 away from the light-emitting layer 3 to form a patterned second electron transport layer 5 in the light-emitting region of the first display region, and forming a patterned third electron transport layer 7 in the non-light-emitting region of the first display region;

[0090] (S4) Evaporation is performed on the side of the patterned second electron transport layer 5 and the patterned third electron transport layer 7 away from the light-emitting layer 3 to form a first cathode 6 and a second cathode 8, respectively, to obtain the first display area; wherein the pattern of the first cathode 6 is the same as that of the second electron transport layer 5, the pattern of the second cathode 8 is the same as that of the third electron transport layer 7, and the second cathode 8 is electrically connected to the first cathode 6.

[0091] It should be noted that in the present invention, a fluorine-containing compound is evaporated on the side of the light-emitting layer away from the anode through CMM (common mask) to form a first electron transport layer with metal-phobic properties covering the light-emitting area and non-light-emitting area of ​​the first display area, so that metal cannot be deposited on its surface to form a cathode; then, through FMM (fine metal mask), a patterned second electron transport layer is formed in the light-emitting area of ​​the first display area, and a patterned third electron transport layer 7 is formed in the non-light-emitting area of ​​the first display area, so that metal can be deposited on the surface of the patterned second electron transport layer and the patterned third electron transport layer 7 through CMM to form a first cathode with the same pattern as the second electron transport layer and a second cathode 8 with the same pattern as the third electron transport layer 7, and the second cathode 8 is connected to the two adjacent first cathodes 6.

[0092] In one embodiment, the evaporation in steps (S1) and (S3) is performed in the presence of a fine metal mask, and the fine metal masks used in steps (S1) and (S3) are different.

[0093] In another embodiment, the non-luminescent region of the first display region includes a patterned fourth electron transport layer 9 and a second cathode 8. The top view of the first display region is as shown above. Figure 5 As shown, along Figure 1 An example cross-sectional view taken along line III-III is shown in FIG. Figure 6 As shown, the schematic diagram of the preparation process of the cross section taken along line III-III is as follows Figure 21 As shown, the preparation method of the first display area includes the following steps:

[0094] (A) performing evaporation deposition on one side of the anode 2 to form a light-emitting layer 3 in the light-emitting area of ​​the first display area;

[0095] (B) evaporating a fluorine-containing compound on a side of the light-emitting layer 3 away from the anode 2 to form a first electron transport layer 4 in the light-emitting region of the first display region and a patterned fourth electron transport layer 9 in the non-light-emitting region of the first display region;

[0096] (C) performing evaporation deposition on a side of the first electron transport layer 4 away from the light-emitting layer 3 to form a patterned second electron transport layer 5 in the light-emitting region of the first display region;

[0097] (D) Evaporation is performed on the side of the patterned second electron transport layer 5 away from the light-emitting layer 3 to form a first cathode 6 and a second cathode 8, thereby obtaining the first display area; wherein the pattern of the first cathode 6 is the same as that of the second electron transport layer 5, the pattern of the second cathode 8 is complementary to that of the fourth electron transport layer 9, and the second cathode 8 is electrically connected to the first cathode 6.

[0098] The evaporation in step (A), step (B) and step (C) is all carried out in the presence of a fine metal mask, and the fine metal mask used in the evaporation in step (A) and step (C) is the same.

[0099] In the present invention, a first electron transport layer covering the light-emitting area of ​​the first display area is formed by FMM, and a patterned fourth electron transport layer 9 is formed in the non-light-emitting area of ​​the first display area. Then, using the same fine metal mask as in step (A), a patterned second electron transport layer is formed in the light-emitting area of ​​the first display area. Finally, using CMM, metal is deposited on the surface of the patterned second electron transport layer and the non-patterned area of ​​the patterned fourth electron transport layer 9 to form a first cathode 6 and a second cathode 8, respectively. The first cathode 6 has the same pattern as the second electron transport layer, and the second cathode 8 has a complementary pattern to the fourth electron transport layer 9.

[0100] In the present invention, the complementary patterns of the second cathode 8 and the fourth electron transport layer 9 mean that the second cathode 8 completely fills the non-patterned area of ​​the patterned fourth electron transport layer 9, and finally the second cathode 8 and the patterned fourth electron transport layer 9 cover the non-luminous area of ​​the first display area.

[0101] From the above description, it can be seen that in the present invention, by designing the structure of the display panel, by designing the first electron transport layer and the patterned second electron transport layer, the second cathode of the non-luminous area of ​​the first display area is patterned, thereby improving the transmittance of the first display area of ​​the display panel.

[0102] The applicant declares that the above content is intended to illustrate the detailed structural features of the present invention, but the present invention is not limited to the aforementioned detailed structural features. This does not mean that the present invention must rely on the aforementioned detailed structural features in order to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent replacements for selected components, additions of auxiliary components, and selection of specific embodiments, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A display panel, characterized in that: The display panel includes a display area, and the display area includes a light-emitting area and a non-light-emitting area; The display area includes a first display area, the light-emitting area of ​​the first display area includes a stacked anode, a light-emitting layer, a first electron transport layer, a patterned second electron transport layer and a first cathode, and the pattern of the first cathode is the same as that of the second electron transport layer; The non-luminescent area of ​​the first display area includes a second cathode, and the second cathode is electrically connected to the first cathode; The non-luminescent area of ​​the first display area includes a first electron transport layer and a patterned third electron transport layer, and the second cathode has the same pattern as the third electron transport layer; and / or, The non-emissive region of the first display region includes a patterned fourth electron transport layer, and the second cathode is complementary to the pattern of the fourth electron transport layer.

2. The display panel according to claim 1, wherein: The second cathode is located between two adjacent first cathodes. Along a first direction, the width of the second cathode is smaller than that of the first cathode. The first direction is perpendicular to the direction of the line connecting the two first cathodes and parallel to the plane where the display panel is located.

3. The display panel according to claim 2, wherein: The second cathode at least partially overlaps with a line connecting geometric centers of two adjacent first cathodes.

4. The display panel according to claim 1, wherein: The second cathode is located between two adjacent first cathodes. Along a second direction, the width of the second cathode is greater than or equal to the width of the first cathode. The second direction is perpendicular to the direction of the line connecting the two first cathodes and parallel to the plane where the display panel is located.

5. The display panel according to claim 4, wherein: Along the second direction, two adjacent second cathodes include a first gap, and the first gap is located in the non-luminescent area of ​​the first display area.

6. The display panel according to claim 1, wherein: The display panel includes a second display area, and the transmittance of the second display area is smaller than the transmittance of the first display area; The second display area includes a third cathode, the third cathode is electrically connected to the first cathode, the third cathode covers the light emitting area of ​​the second display area, and the third cathode covers the non-light emitting area of ​​the second display area.

7. The display panel according to claim 1, wherein: The material of the first electron transport layer and the material of the patterned fourth electron transport layer both include fluorine-containing compounds; The fluorine-containing compound has a structure as shown in Formula I: wherein R1 and R2 are each independently selected from a substituted or unsubstituted C1-C20 straight or branched aliphatic group, a substituted or unsubstituted C3-C30 cycloalkane group, a substituted or unsubstituted C6-C60 aryl group, or a substituted or unsubstituted C6-C60 heteroaryl group; The substituents in R1 and R2 are selected from at least one of a fluorine atom and a trifluoromethyl group; One hydrogen atom in the fluorine-containing compound of formula I may be substituted by a fluorine atom and / or a trifluoromethyl group.

8. The display panel according to claim 7, wherein: The R1 and R2 are each independently selected from Any of the following; The dotted lines represent the attachment sites of the groups.

9. The display panel according to claim 8, wherein: The fluorine-containing compound is selected from any one of the following compounds:

10. A method for preparing a display panel according to claim 1-9, characterized in that: The preparation method comprises the following steps: (1) performing evaporation deposition on one side of the anode to obtain the light-emitting layer; (2) performing vapor deposition on the side of the light-emitting layer obtained in step (1) away from the anode to obtain the first electron transport layer in the first display area; (3) performing vapor deposition on the side of the first electron transport layer obtained in step (2) away from the light-emitting layer to obtain the patterned second electron transport layer; (4) The first cathode is fabricated on a side of the patterned second electron transport layer obtained in step (3) away from the light-emitting layer.

11. The preparation method according to claim 10, characterized in that: The non-luminescent area of ​​the first display area includes a first electron transport layer, a patterned third electron transport layer, and a second cathode. The preparation method of the first display area includes the following steps: (S1) performing evaporation on one side of the anode to form a light-emitting layer in the light-emitting area of ​​the first display area; (S2) vapor-depositing a fluorine-containing compound on a side of the light-emitting layer away from the anode to form a first electron transport layer in the light-emitting area of ​​the first display area and the non-light-emitting area of ​​the first display area; (S3) performing evaporation deposition on a side of the first electron transport layer away from the light-emitting layer to form a patterned second electron transport layer in the light-emitting region of the first display region, and forming a patterned third electron transport layer in the non-light-emitting region of the first display region; (S4) performing vapor deposition on the side of the patterned second electron transport layer and the patterned third electron transport layer away from the light-emitting layer to form a first cathode and a second cathode, respectively, to obtain the first display area; wherein the pattern of the first cathode is the same as that of the second electron transport layer, and the pattern of the second cathode is the same as that of the third electron transport layer.

12. The preparation method according to claim 11, characterized in that The evaporation in steps (S1) and (S3) is performed in the presence of a fine metal mask, and the fine metal mask used in the evaporation in steps (S1) and (S3) is different.

13. The preparation method according to claim 10, characterized in that The non-luminescent area of ​​the first display area includes a patterned fourth electron transport layer and a second cathode, and the preparation method of the first display area includes the following steps: (A) performing evaporation on one side of the anode to form a light-emitting layer in the light-emitting area of ​​the first display area; (B) vapor-depositing a fluorine-containing compound on a side of the light-emitting layer away from the anode to form a first electron transport layer in the light-emitting region of the first display region and a patterned fourth electron transport layer in the non-light-emitting region of the first display region; (C) performing vapor deposition on a side of the first electron transport layer away from the light-emitting layer to form a patterned second electron transport layer in the light-emitting region of the first display region; (D) performing vapor deposition on a side of the patterned second electron transport layer away from the light-emitting layer to form a first cathode and a second cathode, thereby obtaining the first display area; wherein the pattern of the first cathode is the same as that of the second electron transport layer, and the pattern of the second cathode is complementary to that of the fourth electron transport layer.

14. The preparation method according to claim 13, characterized in that The evaporation in step (A), step (B) and step (C) is all carried out in the presence of a fine metal mask; The fine metal mask used in the evaporation in step (A) and step (C) is the same.

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