CN115295738B - Display panel and manufacturing method thereof - Google Patents
Display panel and manufacturing method thereofInfo
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- CN115295738B CN115295738B CN202210993641.6A CN202210993641A CN115295738B CN 115295738 B CN115295738 B CN 115295738B CN 202210993641 A CN202210993641 A CN 202210993641A CN 115295738 B CN115295738 B CN 115295738B
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Abstract
The invention provides a display panel and a preparation method thereof. The display panel comprises a display area, wherein the display area comprises a light-emitting area and a non-light-emitting area, the display area comprises a first display area, the light-emitting area of the first display area comprises an anode, a light-emitting layer, a first electron transmission layer, a patterned second electron transmission layer and a first cathode which are arranged in a stacked mode, and the patterns of the first cathode and the second electron transmission layer are the same. The first display area of the display panel provided by the invention has higher transmittance.
Description
Technical Field
The invention belongs to the technical field of display panels, and particularly relates to a display panel and a preparation method thereof.
Background
With the continuous development of display technology, the requirements of consumers on display panels are continuously improved, various display panel layers are not assembled, rapid development is achieved, such as a liquid crystal display panel, an organic light emitting display panel and the like, and on the basis, display technologies such as 3D display, touch display technology, curved surface display, ultrahigh resolution display and peep-proof display are continuously developed to meet the requirements of consumers.
In addition, in recent years, more and more functions are gradually integrated in a display panel, such as fingerprint recognition, light-sensing touch control, face recognition or iris recognition, however, the functions such as fingerprint recognition, face recognition and the like require that light passes through the display panel to be irradiated onto a sensing device mounted on the backlight surface of the display panel, which requires that the display panel has a high enough light transmittance, however, in the current display panel, the cathode covers the whole light emitting area of the panel, in order to utilize microcavity effect, the transmittance of the cathode is usually only 50% -60%, and the effect of transparent display cannot be realized, so that the light transmittance of the display panel is lower, and therefore, how to provide a display panel with a high light transmittance is a technical problem to be solved in the art.
Disclosure of Invention
In view of the above, the present invention provides a display panel and a method for manufacturing the same, wherein the first electron transport layer and the patterned second electron transport layer are arranged to pattern the cathode in a specific area, thereby improving the light transmittance of the display panel.
In a first aspect, the present invention provides a display panel comprising a display region comprising a light emitting region and a non-light emitting region;
the display area comprises a first display area, wherein the light-emitting area of the first display area comprises an anode, a light-emitting layer, a first electron transport layer, a patterned second electron transport layer and a first cathode which are arranged in a stacked mode, and the patterns of the first cathode and the second electron transport layer are the same.
In the invention, the first cathode and the second electron transport layer have the same pattern, namely, 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.
In another aspect, the present invention provides a method for manufacturing a display panel according to the first aspect, the method comprising the steps of:
(1) Evaporating one side of the anode to obtain the light-emitting layer;
(2) Evaporating the side, away from the anode, of the light-emitting layer obtained in the step (1), and obtaining the first electron transport layer in a first display area;
(3) Evaporating the side, away from the light-emitting layer, of the first electron transport layer obtained in the step (2) to obtain the patterned second electron transport layer;
(4) Evaporating the side, away from the light-emitting layer, of the patterned second electron transport layer obtained in the step (3) to form the first cathode, so as to obtain the display panel.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the design of the structure of the display panel is adopted, and the design of the first electron transmission layer and the patterned second electron transmission layer is adopted to pattern the second cathode of the non-luminous area of the first display area, so that the transmittance of the first display area of the display panel is improved.
Drawings
FIG. 1 is a top view of a first display area in one embodiment of the present invention;
FIG. 2 is a cross-sectional view of one example taken along line I-I of FIG. 1;
FIG. 3 is a cross-sectional view of one example taken along line II-II of FIG. 1 or along line IV-IV of FIG. 5;
FIG. 4 is a schematic view of a structure of a light emitting region in a first display region of a display panel according to the present invention;
FIG. 5 is a top view of a first display area in another embodiment of the present invention;
FIG. 6 is a cross-sectional view of one example taken along line III-III of FIG. 5;
fig. 7 is a schematic structural view of a fourth electron transport layer;
FIG. 8 is a schematic view of the structure of the fourth electron transport layer after evaporation of the second cathode;
FIG. 9 is a schematic diagram of a structure in which the second cathode is entirely overlapped with the connection lines between the geometric centers of two adjacent first cathodes;
FIG. 10 is a schematic diagram of a structure in which the second cathode partially overlaps the connection line between the geometric centers of two adjacent first cathodes;
FIG. 11 is a cross-sectional view of one example taken along the line connecting the geometric centers of two adjacent first cathodes in FIG. 10;
FIG. 12 is a schematic view of a structure in which the width of the second cathode is equal to the width of the first cathode;
FIG. 13 is a schematic view of a structure in which the width of the second cathode is greater than the width of the first cathode;
FIG. 14 is a top view of a second display area in one embodiment provided by the present invention;
FIG. 15 is a cross-sectional view of one example taken along line V-V or line VI-VI of FIG. 14;
FIG. 16 is a top view of a manufacturing process of a display panel according to the present invention;
FIG. 17 is a schematic view of the anatomy of the first electron transport layer prepared in step (2);
FIG. 18 is a schematic view of the anatomy of the second electron transport layer prepared in step (3);
FIG. 19 is a schematic view of the anatomy of the first cathode prepared in step (4);
FIG. 20 is a schematic view of a process for preparing a first display area according to an embodiment of the present invention;
FIG. 21 is a schematic view of a process for preparing a first display area according to another embodiment of the present invention;
Wherein, 1-base plate, 2-positive pole, 3-luminescent 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 interval, 11-third cathode;
31-hole injection layer, 32-hole transport layer, 33-organic light emitting layer;
a is a dyke, B is a connecting line of geometric centers of two adjacent first cathodes.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is further described with reference to the accompanying drawings.
It is noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be practiced in a variety of other ways than as described herein.
In one aspect, the present invention provides a display panel including a display region including a light emitting region and a non-light emitting region.
In a specific embodiment, the display panel includes a first display area, fig. 1 is a top view of the first display area, fig. 2 is a cross-sectional view of one example taken along line I-I of fig. 1, and fig. 3 is a cross-sectional view of one example taken along line II-II of fig. 1.
As can be seen from fig. 1 to 3, the light-emitting region P1 of the first display region provided by the present invention comprises 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 a substrate 1, and the non-light-emitting region P2 of the first display region comprises the first electron transport layer 4, the patterned third electron transport layer 7 and a second cathode 8 stacked in sequence, wherein the second cathode 8 is electrically connected with the first cathode 6.
In the present invention, as shown in fig. 1, the top view of the first display area includes a first electrode 6 and a second cathode 8, and the first cathode 6 and the second cathode 8 are electrically connected. In fig. 1, the dashed box region 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, so that the first cathode 6 has the same pattern as the second electron transport layer 5.
In the process of the first display area, since the first electron transport layer 4 is made of an organic material having a metal-repellent property, metal atoms cannot be deposited on the surface thereof, and thus, 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, by providing the patterned second electron transport layer 5 on the side of the first electron transport layer 4, a 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 the first cathode 6. Thus, in the present invention, the first cathode 6 having the same pattern as the second electron transport layer 5 means that the first cathode 6 formed by depositing metal on the surface of the patterned second electron transport layer 5 covers the surface of the patterned second electron transport layer 5, i.e. the first cathode 6 has the same pattern as the second electron transport layer 5.
Similarly, in the non-light-emitting region of the first display region, the second cathode 8 completely covers the surface of the patterned third electron transport layer 7, and thus, the second cathode 8 has the same pattern as the third electron transport layer 7.
In the invention, the patterns of the first cathode 6and the second electron transport layer 5 are designed to be the same, and the patterns of the second cathode 8and the third electron transport layer 7 are designed to be the same, so that 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.
As can be seen from fig. 2 and 3, the substrate 1 is provided with a bank a covering the edges of the anodes 2 while separating two adjacent anodes 2. In the present invention, the light-emitting region P1 is an opening region where the bank a is not provided, and the non-light-emitting region P2 is a non-opening region where the bank a is provided.
The luminescent layer 3 is arranged on one surface of the anode 2 far away from the substrate 1, and the luminescent layer 3 comprises a hole injection layer, a hole transport layer and an organic luminescent layer which are sequentially overlapped, wherein the hole injection layer is positioned between the anode 2 and the hole transport layer.
As shown in fig. 4, in the present invention, the light emitting region of the first display region 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 sequentially stacked.
In another embodiment, the display panel includes a first display area, fig. 5 is a top view of the first display area, fig. 6 is a cross-sectional view of one example taken along line III-III of fig. 1, and a cross-sectional view of one example taken along line IV-IV of fig. 4 is shown in fig. 3 above.
As can be seen from fig. 5 to 6 and fig. 3, the light-emitting region P1 of the first display region 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, wherein the non-light-emitting region P2 of the first display region 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.
As can be seen from fig. 5, in another embodiment of 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. In fig. 5, the dashed box region represents the patterned second electron transport layer 5, the first cathode 6 completely covers the surface of the patterned second electron transport layer 5, so that the first cathode 6 has the same pattern as the second electron transport layer 5, the second cathode 8 fills the non-patterned region of the patterned fourth electron transport layer 9, and finally the second cathode 8 and the patterned fourth electron transport layer 9 together cover the non-light emitting region of the first display region, so that the second cathode 8 and the patterned fourth electron transport layer 9 are complementary.
A schematic structure of the fourth electron transport layer 9 patterned in the non-light emitting region of the first display region is shown in fig. 7. As can be seen from fig. 7, 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-light emitting region of the first display region, the schematic structure is shown in fig. 8. As can be seen from fig. 8, the second cathode 8 fills the non-pattern portion of the patterned fourth electron transport layer 9 in the non-light emitting region of the first display region, and finally the second cathode 8 and the patterned fourth electron transport layer 9 together cover the non-light emitting region of the first display region, i.e. the second cathode 8 and the patterned fourth electron transport layer 9 are complementary.
In one embodiment, as shown in fig. 1, the second cathode 8 is located between two adjacent first cathodes 6, and the width of the second cathode 8 is smaller than the width of the first cathode 6 along a first direction, where the first direction is perpendicular to the direction in which the two first cathodes 6 are connected, and is parallel to the plane in which the display panel is located.
In a specific embodiment, the second cathode 8 at least partially overlaps with the line connecting the geometric centers of two adjacent first cathodes 6.
In a specific embodiment, a schematic top view structure of the first display area is shown in fig. 9, wherein a dotted line indicates a connection line between geometric centers of two adjacent first cathodes 6, and it can be seen that the second cathode 8 is overlapped with the connection line between geometric centers of two adjacent first cathodes 6. A schematic cross-sectional structure at the dashed line is shown in fig. 2. As can be seen from the combination of fig. 10 and fig. 2, at the dotted line, the second cathode 8 completely covers the connection line between the geometric centers of the adjacent two first cathodes 6, so as to electrically connect the adjacent two cathodes.
In another embodiment, a schematic top view structure of the first display area is shown in fig. 10, wherein a dotted line indicates a connection line between geometric centers of two adjacent first cathodes 6, and as can be seen from fig. 10, the second cathode 8 partially overlaps with the connection line between geometric centers of two adjacent first cathodes 6. As shown in fig. 11, in the schematic cross-sectional structure at the dotted line, as can be seen from fig. 11, the second cathode 8 is discontinuous in the non-light-emitting region, which illustrates that the second cathode 8 partially covers the connection line between the geometric centers of the adjacent two first cathodes 6.
In the present invention, the second cathode 8 is electrically connected to the adjacent two first cathodes 6 by controlling the connection line between the geometric centers of the second cathode 8 and the adjacent two first cathodes 6 to at least partially overlap.
In one embodiment, as shown in fig. 12, the second cathode 8 is located between two adjacent first cathodes 6, and the width of the second cathode 8 is equal to the width of the first cathode 6 along a second direction, and the second direction is perpendicular to the direction in which the two first cathodes 6 are connected and parallel to the plane of the display panel. In the second direction, two adjacent second cathodes 8 comprise a first space 10, the first space 10 being located in the non-light emitting area 2 of the first display area.
In another embodiment, as shown in fig. 13, the width of the second cathode 8 is greater than the width of the first cathode 6 along a second direction, and the second direction is perpendicular to the direction in which the two first cathodes 6 are connected and parallel to the plane of the display panel. In said second direction, two adjacent second cathodes 8 comprise a first separation 10.
In the present invention, in the second direction, 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 space 10 is disposed between the two cathodes, and since the first space 10 is located in the non-light-emitting area of the first display area and the second cathode 8 does not cover the first space 10, light can pass through the area of the first space 10, and the light transmittance of the first display area is improved.
In one embodiment, the display panel includes a second display area, fig. 14 is a top view of the second display area, and fig. 15 is a cross-sectional view taken along line V-V and line VI-VI of fig. 1.
As can be seen from fig. 14 and 15, the light emitting region of the second display region 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, and the non-light emitting region P2 of the second display region includes the third cathode 11.
Fig. 14 is a top view of the second display region, wherein the dashed box region represents the patterned second electron transport layer 5. In the cross-sectional view taken along line V-V and line VI-VI in fig. 14, the third cathode 11 covers the light-emitting region and the non-light-emitting region. As can be seen from fig. 14 and 15, the third cathode 11 completely covers the second display region, and therefore, the light transmittance of the second display region is low.
In the display panel provided by the invention, the non-light-emitting area of the first display area is electrically connected with the first cathode 6 of the light-emitting area of the first display area, and the second cathode 8 does not completely cover the non-light-emitting area of the first display area, so that light can pass through the non-light-emitting area of the first display area to enable the first display area to have higher light transmittance, and in the second display area of the display panel, the third cathode 11 completely covers the light-emitting area and the non-light-emitting area of the second display area to cause lower light transmittance of the second display area, so that the transmittance of the second display area is smaller than that of the first display area.
In one embodiment, the material of the first electron transport layer 4 and the material of the patterned fourth electron transport layer 9 each comprise a fluorine-containing compound;
the fluorine-containing compound has a structure shown as a formula I:
Wherein R 1 and R 2 are each independently selected from a substituted or unsubstituted C1-C20 straight or branched chain aliphatic group, a substituted or unsubstituted C3-C30 cycloalkane group, a substituted or unsubstituted C5-C60 aryl group, a substituted or unsubstituted C5-C60 heteroaryl group;
The substituent groups of the substitution in R 1 and R 2 are selected from at least one of fluorine atoms or trifluoromethyl;
One hydrogen atom in the fluorine-containing compound of the formula I may be substituted with a fluorine atom and/or a trifluoromethyl group.
In the invention, the C1-C20 can be C1, C2, C4, C6, C8, C10, C12, C14, C16, C18, C20 or the like.
The C3-C30 can be C3, C4, C6, C8, C10, C12, C15, C18, C20, C24, C30 or the like.
The C6-C60 can be C6, C8, C10, C15, C20, C30, C42, C50 or C60, etc.
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-repellent property, and a metal cannot be deposited on the surface thereof.
In one embodiment, each of R 1 and R 2 is independently selected from
Any one of them;
Wherein the dotted line represents the attachment site of the group.
In a specific embodiment, the fluorine-containing compound is selected from any one of the following compounds:
In a second aspect, the present invention provides a method for manufacturing a display panel according to the first aspect, wherein a top view of a component structure of a manufacturing process is shown in fig. 16, and the method comprises the following steps:
(1) Evaporating one side of the anode 2 to obtain the light-emitting layer 3;
(2) Evaporating the side, away from the anode 2, of the light-emitting layer 3 obtained in the step (1) to obtain the first electron transport layer 4 in a first display area, wherein the schematic anatomical structure is shown in fig. 17:
(3) Evaporating the side, away from the light-emitting layer 3, of the first electron transport layer 4 obtained in the step (2) to obtain the patterned second electron transport layer 5, wherein the schematic anatomical structure is shown in fig. 18:
(4) And (3) evaporating the side, away from the light-emitting layer 3, of the patterned second electron transport layer 5 obtained in the step (3) to form the first cathode 6, thereby obtaining the display panel. The anatomical schematic diagram is shown in fig. 19:
In a specific embodiment, the non-light emitting region of the first display region includes the first electron transport layer 4, the patterned third electron transport layer 7 and the second cathode 8, the top view of the first display region is shown in fig. 1, the cross-sectional view of an example taken along the line I-I of fig. 1 is shown in fig. 2, the schematic view of the preparation flow of the cross-section taken along the line I-I is shown in fig. 20, and the preparation method of the first display region includes the following steps:
(S1) vapor deposition is performed on one side of an anode 2, and a light-emitting layer 3 is formed in the light-emitting region of the first display region;
(S2) vapor-depositing a fluorine-containing compound on a side of the light-emitting layer 3 remote from the anode 2, and forming a first electron transport layer 1 in the light-emitting region of the first display region and the non-light-emitting region of the first display region;
(S3) evaporating the first electron transport layer 4 on a side away from the light emitting layer 3, forming 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;
(S4) evaporating the patterned second electron transport layer 5 and the patterned third electron transport layer 7 on the side far away from the light-emitting layer 3 to form a first cathode 6 and a second cathode 8 respectively, thereby obtaining the first display area, wherein the first cathode 6 has the same pattern as the second electron transport layer 5, the second cathode 8 has the same pattern as the third electron transport layer 7, and the second cathode 8 is electrically connected with the first cathode 6.
In the present invention, a fluorine-containing compound is evaporated on a side of the light emitting layer far from the anode through CMM (common mask) to form a first electron transport layer with a metal-repellent property covering the light emitting region and the non-light emitting region of the first display region, so that a metal cannot be deposited on the surface to form a cathode, then a patterned second electron transport layer is formed on the light emitting region of the first display region through FMM (fine metal mask), a patterned third electron transport layer 7 is formed on the non-light emitting region of the first display region, so that a metal can be deposited on the surfaces 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 with two adjacent first cathodes 6.
In a specific embodiment, the evaporation in steps (S1) and (S3) are performed in the presence of a fine metal mask, and the fine metal masks used in the evaporation in steps (S1) and (S3) are different.
In another specific embodiment, the non-light emitting 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 shown in fig. 5, a cross-sectional view of an example taken along the line III-III of fig. 1 is shown in fig. 6, a schematic view of a preparation flow of a cross-section taken along the line III-III is shown in fig. 21, and the preparation method of the first display region includes the following steps:
(A) Vapor deposition is performed on one side of the anode 2, and a light-emitting layer 3 is formed in the light-emitting region of the first display region;
(B) Evaporating a fluorine-containing compound on one side of the light-emitting layer 3 far from the anode 2, forming a first electron transport layer 4 in the light-emitting region of the first display region, and forming a patterned fourth electron transport layer 9 in the non-light-emitting region of the first display region;
(C) Evaporating the first electron transport layer 4 on the side far away from the light emitting layer 3, and forming a patterned second electron transport layer 5 in the light emitting region of the first display region;
(D) Evaporating the patterned second electron transport layer 5 on the side far 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 patterns of the first cathode 6 and the second electron transport layer 5 are the same, the patterns of the second cathode 8 and the fourth electron transport layer 9 are complementary, and the second cathode 8 is electrically connected with the first cathode 6.
The evaporation in the step (A), the step (B) and the step (C) are all carried out in the presence of a fine metal mask, and the fine metal mask used in the evaporation in the step (A) and the fine metal mask used in the evaporation in the step (C) are the same.
In the present invention, a first electron transport layer covering the light emitting region of a first display region is formed by an FMM, and a patterned fourth electron transport layer 9 is formed in the non-light emitting region of the first display region. And (3) forming a patterned second electron transport layer in the light emitting area of the first display area by using the same fine metal mask plate as in the step (A), and finally depositing metal on the surface of the patterned second electron transport layer and the non-patterned area of the patterned fourth electron transport layer 9 by using a CMM to form a first cathode 6 and a second cathode 8 respectively, wherein the first cathode 6 has the same pattern as the second electron transport layer, and the second cathode 8 has the complementary pattern with the fourth electron transport layer 9.
In the present invention, the complementary pattern of the second cathode 8 and the fourth electron transport layer 9 means that the second cathode 8 completely fills the non-pattern region 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-light emitting region of the first display region.
As can be seen from the above description, in the present invention, the transmittance of the first display area of the display panel is improved by designing the structure of the display panel, and patterning the second cathode of the non-light emitting area of the first display area by designing the first electron transport layer and the patterned second electron transport layer.
The applicant states that the detailed structural features of the present invention are described in the foregoing, but the present invention is not limited to, i.e., does not mean that the present invention must be practiced in dependence upon such detailed structural features. It should be apparent to those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention and the scope of the disclosure.
Claims (14)
1. A display panel, wherein the display panel comprises a display region comprising a light emitting region and a non-light emitting region;
the display area comprises a first display area, wherein the light-emitting area of the first display area comprises an anode, a light-emitting layer, a first electron transport layer, a patterned second electron transport layer and a first cathode which are arranged in a stacked manner, and the patterns of the first cathode and the second electron transport layer are the same;
the non-light emitting region of the first display region includes a second cathode electrically connected to the first cathode;
The non-light emitting region of the first display region includes a first electron transport layer, a patterned third electron transport layer, the second cathode and the third electron transport layer are in the same pattern, and/or,
The non-light emitting region of the first display region includes a patterned fourth electron transport layer, and the second cathode is complementary to the fourth electron transport layer pattern.
2. The display panel according to claim 1, wherein the second cathode is located between two adjacent first cathodes, and a width of the second cathode is smaller than a width of the first cathode along a first direction, and the first direction is perpendicular to a direction of connecting the two first cathodes and parallel to a plane of the display panel.
3. The display panel of claim 2, wherein the second cathode at least partially overlaps a line connecting geometric centers of adjacent two of the first cathodes.
4. The display panel according to claim 1, wherein the second cathode is located between two adjacent first cathodes, and the width of the second cathode is greater than or equal to the width of the first cathode along a second direction, and the second direction is perpendicular to the direction of the connection line of the two first cathodes and is parallel to the plane of the display panel.
5. The display panel of claim 4, wherein two adjacent second cathodes in the second direction include a first spacing at the non-light emitting region of the first display region.
6. The display panel of claim 1, wherein the display panel comprises a second display region having a transmittance that is less than a transmittance of the first display region;
The second display region includes a third cathode electrically connected to the first cathode, the third cathode covering a light emitting region of the second display region, and the third cathode covering a non-light emitting region of the second display region.
7. The display panel of claim 1, wherein the material of the first electron transport layer and the material of the patterned fourth electron transport layer each comprise a fluorine-containing compound;
the fluorine-containing compound has a structure shown as a formula I:
Wherein R 1 and R 2 are each independently selected from a substituted or unsubstituted C1-C20 straight or branched chain aliphatic group, a substituted or unsubstituted C3-C30 cycloalkane group, a substituted or unsubstituted C6-C60 aryl group, a substituted or unsubstituted C6-C60 heteroaryl group;
The substituent groups of the substitution in R 1 and R 2 are selected from at least one of fluorine atoms or trifluoromethyl;
One hydrogen atom in the fluorine-containing compound of the formula I may be substituted with a fluorine atom and/or a trifluoromethyl group.
8. The display panel of claim 7, wherein each of R 1 and R 2 is independently selected from the group consisting of Any one of them;
Wherein the dotted line represents the attachment site of the group.
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 of manufacturing a display panel according to claims 1-9, comprising the steps of:
(1) Evaporating one side of the anode to obtain the light-emitting layer;
(2) Evaporating the side, away from the anode, of the light-emitting layer obtained in the step (1), and obtaining the first electron transport layer in a first display area;
(3) Evaporating the side, away from the light-emitting layer, of the first electron transport layer obtained in the step (2) to obtain the patterned second electron transport layer;
(4) And (3) manufacturing the first cathode on one side of the patterned second electron transport layer, which is far away from the light-emitting layer, obtained in the step (3).
11. The method of manufacturing according to claim 10, wherein the non-light emitting region of the first display region includes a first electron transport layer, a patterned third electron transport layer, and a second cathode, the method of manufacturing the first display region comprising the steps of:
(S1) vapor deposition is performed on one side of an anode, and a light-emitting layer is formed in the light-emitting region of the first display region;
(S2) vapor-depositing a fluorine-containing compound on a side of the light-emitting layer away from the anode, forming a first electron transport layer in the light-emitting region of the first display region and the non-light-emitting region of the first display region;
(S3) evaporating the first electron transport layer on a side away from the light emitting layer, forming 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;
And (S4) evaporating one side of the patterned second electron transport layer and one side of the patterned third electron transport layer, which are far away from the light-emitting layer, respectively forming a first cathode and a second cathode to obtain the first display area, wherein the first cathode and the second electron transport layer have the same pattern, and the second cathode and the third electron transport layer have the same pattern.
12. The method of claim 11, wherein the vapor deposition in steps (S1) and (S3) are performed in the presence of a fine metal mask, and the fine metal mask used for the vapor deposition in steps (S1) and (S3) is different.
13. The method of manufacturing according to claim 10, wherein the non-light emitting region of the first display region includes a patterned fourth electron transport layer and a second cathode, the method of manufacturing the first display region comprising the steps of:
(A) Evaporating one side of an anode to form a light-emitting layer in the light-emitting area of the first display area;
(B) Evaporating a fluorine-containing compound on one side of the light-emitting layer far away from the anode, forming a first electron transport layer in the light-emitting region of the first display region, and forming a patterned fourth electron transport layer in the non-light-emitting region of the first display region;
(C) Evaporating one side of the first electron transport layer far away from the light emitting layer, and forming a patterned second electron transport layer in the light emitting region of the first display region;
(D) Evaporating one side of the patterned second electron transport layer far away from the light-emitting layer to form a first cathode and a second cathode, and obtaining the first display area, wherein the patterns of the first cathode and the second electron transport layer are the same, and the patterns of the second cathode and the fourth electron transport layer are complementary.
14. The method of claim 13, wherein the evaporating in step (a), step (B) and step (C) are performed in the presence of a fine metal mask;
And (C) the fine metal mask plates used in the evaporation in the step (A) and the step (C) are the same.
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