Display panel and preparation method thereof

Abstract

The invention provides a display panel and a preparation method thereof, and the display panel comprises a light-emitting layer which comprises a plurality of sub-pixels; the supporting column is located on one side of the light-emitting layer; in the direction perpendicular to the plane where the display panel is located and deviating from the light-emitting layer, the sectional area, parallel to the plane where the display panel is located, of each supporting column is gradually increased, and at least one section, perpendicular to the plane where the display panel is located, of each supporting column is in an inverted trapezoid shape; the supporting columns are located between the adjacent sub-pixels in the direction of the plane where the display panel is located. The supporting column is made of a negative organic photoresist; the supporting column is formed by at least coating, exposing, developing and curing an organic light resistor; the cathode layer is located on the same side of the light-emitting layer and the supporting columns, the cathode layer comprises a plurality of through holes, the through holes are formed in the bottoms of the supporting columns, and the cathode layer and the through holes form a transverse isolation area through the supporting columns. According to the invention, the cathode layer on the whole surface can be separated to form a net-shaped cathode structure, and the transverse crosstalk current between sub-pixels is reduced.

Description

Technical Field

[0001] The present invention relates to the field of display panel structures, and in particular to a display panel and a method for preparing the same. Background Art

[0002] As a new generation of display technology, OLED (Organic Light Emitting Diode) displays have the advantages of low power consumption, high color gamut, high brightness, high refresh rate, wide viewing angle, and high response speed. In particular, the high refresh rate makes OLED displays more suitable for display in mobile devices, and therefore they are increasingly widely used.

[0003] Current OLED products suffer from severe crosstalk at low grayscales, causing offsets in the RGB color coordinates. This crosstalk is primarily due to the full-surface vapor deposition of the OLED's three-color common layer and cathode layer, which is fully conductive. During the display process, lateral electric field interference between adjacent sub-pixels causes distortion in the display panel.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0005] In view of this, the present invention provides a display panel and a manufacturing method thereof, which at least solves the above-mentioned problem of distortion of the display panel caused by lateral crosstalk between sub-pixels due to conduction of the entire cathode layer.

[0006] One aspect of the present invention provides a display panel, comprising:

[0007] a light-emitting layer comprising a plurality of sub-pixels;

[0008] A support column is located on one side of the light-emitting layer; the cross-sectional area of ​​the support column parallel to the plane of the display panel gradually increases in a direction perpendicular to the plane of the display panel and away from the light-emitting layer, and the shape of at least one cross-section of the support column perpendicular to the plane of the display panel is an inverted trapezoid; the support column is located between adjacent sub-pixels in the direction of the plane of the display panel; the material of the support column is a negative organic photoresist; the support column is formed by at least coating, exposing, developing, and curing the organic photoresist; and

[0009] The cathode layer includes a first part and a second part separated from each other, the first part is located on the same side of the light-emitting layer as the support column, and the second part is located on the side of the support column away from the light-emitting layer; the first part of the cathode layer includes a plurality of through holes, the through holes are formed at the bottom of the support column, and the cathode layer forms a lateral isolation region through the support column and the through holes.

[0010] In some embodiments, the projection of the sub-pixel on the plane where the display panel is located is included in the projection of the cathode layer on the plane where the display panel is located.

[0011] In some embodiments, the display panel further comprises:

[0012] The pixel definition layer is located on a side of the support column close to the light-emitting layer; the pixel definition layer includes a plurality of pixel definition areas, and the sub-pixels are located in the pixel definition areas.

[0013] In some embodiments, the display panel further comprises:

[0014] The planarization layer is located on a side of the pixel definition layer away from the support pillars to provide a flat surface for the preparation of the sub-pixels.

[0015] In some embodiments, the support pillar is separated from a projection of the sub-pixel based on the planarization layer based on the projection of the planarization layer.

[0016] In some embodiments, the sub-pixels include three types: red, green, and blue. In the direction of the plane where the display panel is located, at least some of the red sub-pixels have the support columns between them and the adjacent sub-pixels of other colors.

[0017] In some embodiments, in the direction of the plane where the display panel is located, there is a support column between each red sub-pixel and adjacent sub-pixels of other colors.

[0018] In some embodiments, in the direction of the plane where the display panel is located, the green sub-pixel and the adjacent blue sub-pixel also have the support column.

[0019] In some embodiments, in the direction of the plane where the display panel is located, the support column is located between at least part of the green sub-pixels and adjacent sub-pixels of other colors;

[0020] In the direction of the plane where the display panel is located, the support column is located between at least part of the blue sub-pixels and adjacent sub-pixels of other colors.

[0021] Another aspect of the present invention further provides a method for preparing a display panel, which comprises the following steps:

[0022] Applying the negative type organic photoresist;

[0023] exposing the organic photoresist using a mask to prepare the support pillar;

[0024] The unexposed areas of the organic photoresist are washed away with a developer, and then cured to obtain the support column; wherein, along a direction perpendicular to the plane of the display panel and away from the light-emitting layer, the cross-sectional area of ​​the support column parallel to the plane of the display panel gradually increases, and at least one cross-sectional shape of the support column perpendicular to the plane of the display panel is an inverted trapezoid;

[0025] Vapor-depositing the sub-pixels between the support pillars to form the light-emitting layer; wherein the support pillars are located between adjacent sub-pixels in the direction of the plane where the display panel is located; and

[0026] The cathode layer is evaporated on the side of the light-emitting layer close to the support column; wherein the cathode layer includes a first part and a second part separated from each other, the first part is located on the same side of the light-emitting layer as the support column, and the second part is located on the side of the support column away from the light-emitting layer; the first part of the cathode layer includes a plurality of through holes, the through holes are formed at the bottom of the support column, and the cathode layer forms a lateral isolation region through the support column and the through holes.

[0027] Compared with the prior art, the present invention has at least the following advantages:

[0028] The display panel and preparation method of the present invention, by designing a wedge-shaped support column that is wide at the top and narrow at the bottom, form two separate parts of the cathode layer during vapor deposition preparation, thereby isolating the entire surface of the cathode layer from being conductive, forming a mesh cathode structure, reducing the lateral crosstalk current between sub-pixels, and improving the display effect of the display panel at low grayscale.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are incorporated into and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and it is clear that those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0031] Figure 1A schematic diagram showing a display panel provided by the present invention;

[0032] Figure 2 A schematic structural diagram of a support column and a cathode layer of a display panel provided by the present invention is shown;

[0033] Figure 3 A schematic top view showing the arrangement of support columns of a display panel according to a first embodiment of the present invention;

[0034] Figure 4 A schematic top view showing the arrangement of support columns of a display panel according to a second embodiment of the present invention;

[0035] Figure 5 A schematic top view showing the arrangement of support columns of a display panel according to a third embodiment of the present invention;

[0036] Figure 6 A schematic top view showing the arrangement of support columns of a display panel according to a fourth embodiment of the present invention;

[0037] Figure 7 A schematic top view showing the arrangement of support columns of a display panel according to a fifth embodiment of the present invention;

[0038] Figure 8 A flow chart showing a method for manufacturing a display panel provided by the present invention;

[0039] Figure 9 Show Figure 8 A schematic diagram of the structure of the display panel before step S110;

[0040] Figure 10 Show Figure 8 A schematic diagram of the structure of the display panel after step S110;

[0041] Figure 11 Show Figure 8 A schematic diagram of the structure of the display panel after step S120;

[0042] Figure 12 Show Figure 8 A schematic diagram of the structure of the display panel after step S130.

[0043] Reference numerals:

[0044] 1. Luminescent layer

[0045] 11 sub-pixels

[0046] 2 support columns

[0047] 21 Organic photoresist

[0048] 3 Cathode layer

[0049] 31 Part 1

[0050] 32 Part 2

[0051] 4 pixel definition layers

[0052] 5. Planarization layer

[0053] 6 Mask

[0054] 7 Display Panel DETAILED DESCRIPTION

[0055] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Identical reference numerals in the figures represent identical or similar structures, and thus a repeated description thereof will be omitted.

[0056] The terms "first," "second," and similar terms used in the specific description do not denote any order, quantity, or importance, but are simply used to distinguish different components. Furthermore, in the description of the present invention, the terms "upper," "lower," and the like indicate orientations or positional relationships based on those shown in the accompanying drawings. These are intended solely for ease of description and do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0057] It should be noted that, in the absence of conflict, the embodiments of the present invention and features in different embodiments may be combined with each other.

[0058] The inventors of this case have conducted careful and in-depth research and have provided a solution to the problems existing in the prior art. The present invention provides a display panel and a method for preparing the same, wherein the display panel includes: a light-emitting layer including a plurality of sub-pixels; a support column located on one side of the light-emitting layer; the cross-sectional area of ​​the support column parallel to the plane where the display panel is located gradually increases in a direction perpendicular to the plane where the display panel is located and away from the light-emitting layer; the support column is located between adjacent sub-pixels in the direction of the plane where the display panel is located; and a cathode layer located on the same side of the light-emitting layer as the support column, the cathode layer including a plurality of through holes formed at the bottom of the support column. The display panel and the method for preparing the same of the present invention form two separated parts of the cathode layer during the evaporation preparation by designing a wedge-shaped support column that is wide at the top and narrow at the bottom, so as to block the conduction of the entire surface of the cathode layer, thereby forming a mesh cathode structure, reducing the lateral crosstalk current between sub-pixels, and improving the display effect of the display panel at low grayscale.

[0059] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0060] Figure 1 A schematic diagram showing a display panel provided by the present invention; Figure 2 A schematic structural diagram of a support column and a cathode layer of a display panel provided by the present invention is shown.

[0061] One aspect of the present invention provides a display panel 7 , comprising: a planarization layer 5 , a pixel definition layer 4 , a light emitting layer 1 , a cathode layer 3 , and support pillars 2 .

[0062] In some embodiments, the planarization layer 5 is used to planarize the underlying film structure of the display panel 7 to facilitate the preparation of the pixel definition layer 4 and the light-emitting layer 1 .

[0063] In some embodiments, the pixel definition layer 4 is located on one side of the planarization layer 5. The pixel definition layer 4 forms a plurality of protrusions on the planarization layer 5, and the grooves between the protrusions form a plurality of pixel definition areas to facilitate the evaporation deposition of sub-pixels 11. The sub-pixels 11 are located in the pixel definition areas.

[0064] In some embodiments, the light emitting layer 1 includes a plurality of sub-pixels 11. When the display panel 7 is an OLED display panel, the sub-pixels 11 are made of OLED material, but the present invention is not limited thereto.

[0065] In some embodiments, support pillars 2 are located on one side of light-emitting layer 1. The cross-sectional area of ​​support pillars 2, parallel to the plane of display panel 7, gradually increases in a direction perpendicular to the plane of display panel 7 and away from light-emitting layer 1, forming a wedge-shaped support pillar 2 that is wider at the top and narrower at the bottom. This allows for the formation of through-holes in cathode layer 3 during vapor deposition. Support pillars 2 are located between adjacent sub-pixels 11 in the plane of display panel 7, thereby blocking the entire surface of cathode layer 3 from being conductive, reducing lateral crosstalk current between sub-pixels 11 and improving the display quality of display panel 7 at low grayscale levels.

[0066] In some embodiments, the cathode layer 3 includes a first portion 31 and a second portion 32 that are separated from each other. The first portion 31 is located on the same side of the light-emitting layer 1 as the support pillar 2, and the second portion 32 is located on the side of the support pillar 2 facing away from the light-emitting layer 1. The first portion 31 of the cathode layer 3 includes a plurality of through holes formed at the bottom of the support pillar 2. The cathode layer 3 forms a lateral isolation region through the support pillar 2 and the through holes. The first portion 31 of the cathode layer 3 forms a lateral isolation region through the support pillar 2 and the through holes to isolate the entire surface of the cathode layer 3 from conduction, reducing lateral crosstalk current between sub-pixels 11 and improving the display quality of the display panel 7 at low grayscales.

[0067] In some embodiments, the projection of the second portion 32 of the cathode layer 3 on the planarization layer 5 includes the projection of the through hole on the planarization layer 5. In other words, due to the presence of the wedge-shaped support pillar 2, which is wide at the top and narrow at the bottom, the first portion 31 and the second portion 32 of the cathode layer 3, which should be connected, are separated.

[0068] In some embodiments, the support pillars 2 are made of a negative organic photoresist 21, such as the Dongjin DLX-100R1 model, to form wedge-shaped support pillars 2 that are wide at the top and narrow at the bottom, but the invention is not limited thereto. The exposed portion of the negative organic photoresist is insoluble in the developer, while the unexposed portion is soluble in the developer. The support pillars 2 are formed from the organic photoresist 21 through at least coating, exposure, development, and curing, but the invention is not limited thereto.

[0069] In some embodiments, the projection of the sub-pixel 11 on the plane where the display panel 7 is located is included in the projection of the cathode layer 3 on the plane where the display panel 7 is located, so as to ensure that the through hole is arranged between the sub-pixels 11 to isolate the entire surface of the cathode layer 3 from being conductive, reduce the lateral crosstalk current between the sub-pixels 11, and improve the display effect of the display panel 7 at low grayscale.

[0070] In some embodiments, the support column 2 is separated from the projection of the sub-pixel 11 based on the planarization layer 5 to ensure that the through hole is arranged between the sub-pixels 11 to block the entire surface of the cathode layer 3 from being conductive, forming a mesh cathode structure, reducing the lateral crosstalk current between the sub-pixels 11, and improving the display effect of the display panel 7 at low grayscale.

[0071] Figure 3 A schematic top view showing the arrangement of support columns of a display panel according to a first embodiment of the present invention; Figure 4 A schematic top view showing the arrangement of support columns of a display panel according to a second embodiment of the present invention; Figure 5 A schematic top view showing the arrangement of support columns of a display panel according to a third embodiment of the present invention; Figure 6 A schematic top view showing the arrangement of support columns of a display panel according to a fourth embodiment of the present invention; Figure 7 A schematic top view of the arrangement of support columns of a display panel according to a fifth embodiment of the present invention is shown.

[0072] refer to Figures 3 to 7 The present invention provides five embodiments of the top-view structural diagrams of the support columns 2 and sub-pixels 11 of the display panel 7. However, these five embodiments are only used for illustrative purposes and do not mean that the present invention only includes these five embodiments. It is only necessary to meet the following general description.

[0073] In some embodiments, the sub-pixels 11 include three types: red, green, and blue. In the direction of the plane where the display panel is located, there are support columns 2 between at least some of the red sub-pixels 11 and the adjacent sub-pixels 11 of other colors, but the present invention is not limited thereto. In some embodiments, in the direction of the plane where the display panel is located, there are support columns 2 between each red sub-pixel 11 and the adjacent sub-pixels 11 of other colors, but the present invention is not limited thereto. In some embodiments, in the direction of the plane where the display panel is located, there are support columns 2 between the green sub-pixels 11 and the adjacent blue sub-pixels 11, but the present invention is not limited thereto. In some embodiments, in the direction of the plane where the display panel is located, there are support columns 2 between at least some of the green sub-pixels 11 and the adjacent sub-pixels 11 of other colors; in the direction of the plane where the display panel is located, there are support columns 2 between at least some of the blue sub-pixels 11 and the adjacent sub-pixels 11 of other colors, but the present invention is not limited thereto. The above is only a general description, and the following is an explanation with specific embodiments.

[0074] [First embodiment]

[0075] refer to Figure 3 In this embodiment, among all sub-pixels 11, a support column 2 is provided between half of the red sub-pixels 11 and adjacent sub-pixels 11 of other colors, wherein two support columns 2 surround one red sub-pixel 11. A support column 2 is provided between half of the blue sub-pixels 11 and adjacent sub-pixels 11 of other colors, wherein two support columns 2 surround one blue sub-pixel 11. A support column 2 is provided between half of the green sub-pixels 11 and adjacent sub-pixels 11 of other colors, wherein two support columns 2 surround one green sub-pixel 11. In each row of pixel arrangement, the support columns 2 sequentially surround the red sub-pixels 11, the blue sub-pixels 11, and the green sub-pixels 11. Specifically, each of the sub-pixels 11 surrounded by the support columns 2 is surrounded by support columns 2 on all four sides. The distribution of the support columns 2 allows the cathode layer 3 to form through holes during the evaporation process, thereby isolating the entire surface of the cathode layer 3 from being conductive, reducing the lateral crosstalk current between the sub-pixels 11, and improving the display effect of the display panel 7 at low grayscale.

[0076] [Second embodiment]

[0077] refer to Figure 4In this embodiment, only all red sub-pixels 11 have support columns 2 between them and adjacent sub-pixels 11 of other colors, wherein two support columns 2 surround one red sub-pixel 11. No support columns 2 are provided for the blue sub-pixels 11 and the green sub-pixels 11. Specifically, each of the red sub-pixels 11 surrounded by support columns 2 is surrounded by support columns 2 on all four sides. Because the red sub-pixel 11 is a sub-pixel with a high grayscale when lit, its lateral crosstalk is severe at low grayscale. Therefore, only the red sub-pixel 11 is isolated to improve the display effect of the display panel 7 at low grayscale. At the same time, the number of through holes in the cathode layer 3 is reduced, and the structural strength of the cathode layer 3 is improved.

[0078] [Third embodiment]

[0079] refer to Figure 5 In this embodiment, all sub-pixels 11 are provided with support columns 2 between adjacent sub-pixels 11 of other colors, wherein two support columns 2 half-surround one sub-pixel 11. Specifically, each sub-pixel 11 surrounded by support columns 2 is surrounded by support columns 2 on three sides, and the directions in which each sub-pixel 11 is not surrounded are the same. This allows for a horizontal separation between every two sub-pixels 11 when arranged in an array, further improving the display quality of the display panel 7 at low grayscales.

[0080] [Fourth embodiment]

[0081] refer to Figure 6 In this embodiment, all sub-pixels 11 have support columns 2 between them and adjacent sub-pixels 11 of other colors, wherein two support columns 2 semi-surround one sub-pixel 11. The difference from the third embodiment is that the two support columns 2 have different shapes and different degrees of semi-surrounding the sub-pixels 11. Specifically, each of the above-mentioned sub-pixels 11 surrounded by support columns 2 is surrounded by support columns 2 on two sides, and the two directions in which each sub-pixel 11 is not surrounded are the same. Both this embodiment and the third embodiment can realize a horizontal partition between every two sub-pixels 11 when arranged in an array, so as to improve the display effect of the display panel 7 at low grayscale. At the same time, compared with the third embodiment, since the support columns 2 are reused between every two adjacent sub-pixels 11, the total area of ​​the through-holes of the cathode layer 3 can be reduced, thereby improving the structural strength of the cathode layer 3.

[0082] [Fifth embodiment]

[0083] refer to Figure 7In this embodiment, in the second embodiment, only all red sub-pixels 11 and adjacent sub-pixels 11 of other colors have support columns 2, that is, only all red sub-pixels 11 are surrounded by support columns 2 on all sides. Then, a support column 2 is provided between the blue sub-pixel 11 and the green sub-pixel 11, and the support column 2 is reused for the blue sub-pixel 11 and the green sub-pixel 11 to further isolate the entire surface of the cathode layer 3 from being turned on, reduce the lateral crosstalk current between the sub-pixels 11, and improve the display effect of the display panel 7 at low grayscale.

[0084] The display panel 7 of the present invention is designed with a wedge-shaped support column 2 that is wide at the top and narrow at the bottom, so that the cathode layer 3 forms a separated first part 31 and a second part 32 during the evaporation preparation, thereby isolating the entire surface of the cathode layer 3 from being conductive, forming a mesh cathode structure, reducing the lateral crosstalk current between the sub-pixels 11, and improving the display effect of the display panel 7 at low grayscale.

[0085] Figure 8 A flow chart showing a method for manufacturing a display panel provided by the present invention; Figure 9 Show Figure 8 A schematic diagram of the structure of the display panel before step S110; Figure 10 Show Figure 8 A schematic diagram of the structure of the display panel after step S110; Figure 11 Show Figure 8 A schematic diagram of the structure of the display panel after step S120; Figure 12 Show Figure 8 A schematic diagram of the structure of the display panel after step S130.

[0086] refer to Figures 8 to 12 Based on the same inventive concept, another aspect of the present invention further provides a method for manufacturing a display panel, which is used to manufacture the above-mentioned display panel 7, comprising the following steps:

[0087] S110, coating a negative type organic photoresist 21;

[0088] S120, exposing the organic photoresist 21 using the mask plate 6 to prepare the support column 2;

[0089] S130, using a developer to wash away the unexposed areas of the organic photoresist 21, and curing to obtain a support column 2; wherein, along a direction perpendicular to the plane of the display panel and away from the light-emitting layer 1, the cross-sectional area of ​​the support column 2 parallel to the plane of the display panel gradually increases, and at least one cross-sectional shape of the support column 2 perpendicular to the plane of the display panel is an inverted trapezoid;

[0090] S140, evaporating sub-pixels 11 between the support pillars 2 to form a light-emitting layer 1; wherein the support pillars 2 are located between adjacent sub-pixels 11 in the direction of the plane where the display panel is located; and

[0091] S150 , vapor-depositing a cathode layer 3 on a side of the light-emitting layer 1 close to the support column 2 , and forming a through hole at the bottom of the support column 2 .

[0092] It is worth noting that S110 to S150 are merely step numbers, intended to facilitate subsequent reference and avoid duplication, and are not intended to limit the order in which the steps of this method are to be performed. In other embodiments, the above steps of this method may be written in an alternate order, and the method is not limited thereto. Subsequent step numbers in the present invention all have the same meaning, and any duplication will not be repeated.

[0093] refer to Figure 9 and 10 In step S110, the support pillars 2 may be made of a negative organic photoresist 21, such as the Dongjin DLX-100R1 model, to form wedge-shaped support pillars 2 that are wider at the top and narrower at the bottom. The exposed portion of the negative organic photoresist is insoluble in the developer, while the unexposed portion is soluble in the developer.

[0094] refer to Figure 11 In the above step S120, during exposure, the negative organic photoresist 21 is located below the mask plate 6, and the light source is irradiated downward from above the mask plate 6. The mask plate 6 is provided with a through hole at the position where the support column 2 is to be formed. The shape of the through hole can be designed according to the shape of the support column 2. For details, please refer to Figures 3 to 7 The shape of the support pillar 2 in the embodiment described above, or other embodiments, can be used. During exposure, the upper surface of the organic photoresist receives a greater dose of light than the lower surface, and the exposed portion of the negative-type organic photoresist 21 does not dissolve in the developer during development, leaving the exposed area. Consequently, more organic photoresist 21 remains in the exposed area, forming a wedge-shaped support pillar 2. In other embodiments, a positive-type organic photoresist or other preparation methods may be used, as long as the final result is a wedge-shaped support pillar 2 that is wider at the top and narrower at the bottom.

[0095] refer to Figure 12 In the above step S130, since the exposed portion of the negative organic photoresist will not dissolve in the developer, while the unexposed portion will dissolve in the developer, the developer is used to wash away the unexposed area of ​​the organic photoresist 21, so as to finally form a support column 2 with a wedge-shaped structure that is wide at the top and narrow at the bottom, so that a through hole is formed in the cathode layer 3 during the evaporation preparation.

[0096] In step S140, sub-pixels 11 are evaporated between the support pillars 2 to form a light-emitting layer 1. The light-emitting layer 1 includes a plurality of sub-pixels 11. When the display panel 7 is an OLED display panel, the sub-pixels 11 are made of OLED material, but the present invention is not limited thereto. Before preparing the light-emitting layer 1, a pixel definition layer 4 must also be prepared. The pixel definition layer 4 is located on one side of the planarization layer 5. The pixel definition layer 4 forms a plurality of protrusions on the planarization layer 5. The grooves between the protrusions form a plurality of pixel definition areas to facilitate the evaporation of the sub-pixels 11. The sub-pixels 11 are located within the pixel definition areas.

[0097] In the above step S150, since the cathode layer 3 is prepared by evaporation, when the support column 2 is a wedge-shaped structure that is wide at the top and narrow at the bottom when the display panel is square, the cathode layer 3 cannot be completely connected at the support column 2, forming a first part 31 and a second part 32 that are separated from each other, and then a through hole is formed at the bottom of the support column 2 to cut off the entire surface of the cathode layer 3 from being conductive, thereby reducing the lateral crosstalk current between the sub-pixels 11 and improving the display effect of the display panel 7 at low grayscale.

[0098] For other aspects of the embodiment of the present method, reference may be made to the embodiment of the display panel 7 described above, and repeated details will be omitted.

[0099] The preparation method of the display panel 7 of the present invention designs a wedge-shaped support column 2 that is wide at the top and narrow at the bottom, so that the cathode layer 3 is formed into two separated parts during the evaporation preparation, thereby isolating the entire surface of the cathode layer 3 from being conductive, forming a mesh cathode structure, reducing the lateral crosstalk current between the sub-pixels 11, and improving the display effect of the display panel 7 at low grayscale.

[0100] In summary, the display panel and preparation method thereof of the present invention, by designing a wedge-shaped support column that is wide at the top and narrow at the bottom, allows the cathode layer to be formed into two separated parts during vapor deposition preparation, thereby isolating the entire surface of the cathode layer from being conductive, forming a mesh cathode structure, reducing the lateral crosstalk current between sub-pixels, and improving the display effect of the display panel at low grayscale.

[0101] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A display panel, characterized in that: include: A light-emitting layer (1) comprising a plurality of sub-pixels (11); A support column (2) is located on one side of the light-emitting layer (1); along a direction perpendicular to the plane where the display panel is located and away from the light-emitting layer (1), the cross-sectional area of ​​the support column (2) parallel to the plane where the display panel is located gradually increases, and the shape of at least one cross-section of the support column (2) perpendicular to the plane where the display panel is located is an inverted trapezoid; the support column (2) is located between adjacent sub-pixels (11) in the direction of the plane where the display panel is located; the material of the support column (2) is a negative organic photoresist (21); the support column (2) is formed by the organic photoresist (21) through at least coating, exposure, development and curing; and A cathode layer (3) comprises a first portion (31) and a second portion (32) separated from each other, wherein the first portion (31) is located on the same side of the light-emitting layer (1) as the support column (2), and the second portion (32) is located on the side of the support column (2) away from the light-emitting layer (1); the first portion (31) of the cathode layer (3) comprises a plurality of through holes, wherein the through holes are formed at the bottom of the support column (2), and the cathode layer (3) forms a lateral isolation region through the support column (2) and the through holes.

2. The display panel according to claim 1, wherein: The projection of the sub-pixel (11) on the plane where the display panel is located is included in the projection of the cathode layer (3) on the plane where the display panel is located.

3. The display panel according to claim 1, wherein: Also includes: A pixel definition layer (4) is located on a side of the support column (2) close to the light-emitting layer (1); the pixel definition layer (4) includes a plurality of pixel definition areas, and the sub-pixels (11) are located in the pixel definition areas.

4. The display panel according to claim 3, wherein: Also includes: A planarization layer (5) is located on a side of the pixel definition layer (4) away from the support pillar (2) to provide a flat surface for the preparation of the sub-pixel (11).

5. The display panel according to claim 4, wherein: The support column (2) is based on a projection of the planarization layer (5), and is separated from a projection of the sub-pixel (11) based on the planarization layer (5).

6. The display panel according to claim 1, wherein: The sub-pixels (11) include three types: red, green and blue. In the direction of the plane where the display panel is located, the support column (2) is provided between at least some of the red sub-pixels (11) and adjacent sub-pixels (11) of other colors.

7. The display panel according to claim 6, wherein: In the direction of the plane where the display panel is located, the support column (2) is provided between each red sub-pixel (11) and adjacent sub-pixels (11) of other colors.

8. The display panel according to claim 7, wherein: In the direction of the plane where the display panel is located, the green sub-pixel (11) and the adjacent blue sub-pixel (11) also have the support column (2).

9. The display panel according to claim 6, wherein: In the direction of the plane where the display panel is located, the support column (2) is provided between at least some of the green sub-pixels (11) and adjacent sub-pixels (11) of other colors; In the direction of the plane where the display panel is located, the support column (2) is provided between at least part of the blue sub-pixels (11) and adjacent sub-pixels (11) of other colors.

10. A method for preparing a display panel, for preparing the display panel according to claim 1, characterized in that: The following steps are involved: Applying the negative type organic photoresist (21); Using a mask plate (6) to expose the organic photoresist (21) to prepare the support column (2); The unexposed area of ​​the organic photoresist (21) is washed away with a developer, and the organic photoresist (21) is cured to obtain the support column (2); wherein, along a direction perpendicular to the plane where the display panel is located and away from the light-emitting layer (1), the cross-sectional area of ​​the support column (2) parallel to the plane where the display panel is located gradually increases, and the shape of at least one cross-section of the support column (2) perpendicular to the plane where the display panel is located is an inverted trapezoid; The sub-pixels (11) are evaporated between the support columns (2) to form the light-emitting layer (1); wherein the support columns (2) are located between adjacent sub-pixels (11) in the direction of the plane where the display panel is located; and The cathode layer (3) is evaporated on a side of the light-emitting layer (1) close to the support column (2); wherein the cathode layer (3) comprises a first portion (31) and a second portion (32) separated from each other, the first portion (31) being located on the same side of the light-emitting layer (1) as the support column (2), and the second portion (32) being located on a side of the support column (2) facing away from the light-emitting layer (1); The first portion (31) of the cathode layer (3) includes a plurality of through holes, wherein the through holes are formed at the bottom of the support column (2), and the cathode layer (3) forms a lateral isolation region through the support column (2) and the through holes.

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