Display panel and display device

Abstract

The invention relates to a display panel and a display device. The display panel comprises an array substrate, a pixel definition layer and a light emitting device layer. The pixel definition layer is arranged on the array substrate and comprises a plurality of first dams and a plurality of second dams, the first dams are arranged in a criss-cross mode and define a plurality of first openings, and two spaced second dams are arranged between every two adjacent first dams in the transverse direction or the longitudinal direction and define a plurality of second openings. Each first opening is divided into three second openings; the light-emitting device layer comprises a plurality of light-emitting devices, and the light-emitting devices are correspondingly arranged in the second openings respectively; wherein the colors of the light-emitting devices in the three second openings divided by each first opening are different, and the colors of the light-emitting devices in the second openings on the two sides of each first dam are the same.

Description

Technical Field

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

[0002] Ink-Jet Printing OLED (IJP OLED) is a new display technology that has physical advantages that LCD technology cannot match. Since IJP OLED devices are all-solid-state, non-vacuum devices with characteristics such as anti-vibration and low-temperature resistance (-40°C), they have a wide range of applications. Taking large-size panels as an example, in order to meet the display needs of high-resolution 8K / 16K, the IJP OLED structure has also changed from a bottom-emitting structure to a top-emitting structure, but it is limited by the original resolution of the printer equipment, making it difficult to achieve high-precision printing of high-resolution displays. Summary of the invention

[0003] The embodiments of the present application provide a display panel and a display device, which enable existing printer equipment to be suitable for 8K and 16K high-resolution displays while meeting the requirements for high-resolution display.

[0004] In order to achieve the above object, according to a first aspect of the present application, a display panel is provided, comprising:

[0005] An array substrate;

[0006] a pixel definition layer, disposed on the array substrate, the pixel definition layer comprising a plurality of first dams and a plurality of second dams, the plurality of first dams being arranged in a crisscross pattern and defining a plurality of first openings, two second dams being arranged spaced apart between two adjacent first dams in a horizontal or vertical direction, and each of the first openings being divided into three second openings;

[0007] A light emitting device layer, comprising a plurality of light emitting devices, wherein the plurality of light emitting devices are respectively and correspondingly arranged in the plurality of second openings;

[0008] The light emitting devices in the three second openings separated by each of the first openings have different colors, and the light emitting devices in the second openings on both sides of each of the first dams have the same color.

[0009] In one embodiment, among the three second openings separated by each first opening, the second opening area between two adjacent second dams is set to S1, the second opening area between adjacent first dams and second dams is set to S2, and S1 is greater than S2.

[0010] In one embodiment, between two adjacent second dams, the color of the light emitting device in the second opening is set to blue.

[0011] In one embodiment, between the adjacent first dam and the second dam, the color of the light emitting device in the second opening is set to red or green.

[0012] In one embodiment, among the three second openings separated by each first opening, the second opening area between two adjacent second dams is set to S1, the second opening area between adjacent first dams and second dams is set to S2, and S1 is equal to twice S2.

[0013] In one embodiment, in the thickness direction of the display panel, the height of the second dam is greater than the height of the first dam.

[0014] In one embodiment, the width of the first dam is smaller than the width of the second dam.

[0015] In one embodiment, the material of the first dam includes an inorganic photoresist material;

[0016] The material of the second bank includes organic photoresist material.

[0017] In one embodiment, the width of the first dam is less than or equal to 10 μm;

[0018] The width of the second bank is set to be 14 μm to 15 μm.

[0019] According to a second aspect of the present application, a display device is provided, comprising the above-mentioned display panel.

[0020] In the display panel of the embodiment of the present application, the second dam separates the first opening into three second openings, and the light-emitting devices in the three second openings separated by each first opening have different colors. In this way, the pixel opening area of ​​a single sub-pixel can be reduced, the pixel resolution can be improved, and the high-resolution display requirements can be met. At the same time, the light-emitting devices in the second openings on both sides of each first dam have the same color, and the printer device can simultaneously spray droplets of the same color into the two second openings to form light-emitting layers of the same color. That is, a single inkjet simultaneously forms light-emitting layers of two light-emitting devices. On the basis of meeting the high-resolution display requirements, the printing movement accuracy of the printer device and the requirements for a single droplet ejection are reduced, so that the existing printer device can also be suitable for 8K and 16K high-resolution displays.

[0021] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0023] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0024] Figure 1 A schematic diagram of sub-pixel arrangement of a display panel provided by the prior art;

[0025] Figure 2 A schematic diagram of the sub-pixel arrangement of a display panel provided in an embodiment of the present application;

[0026] Figure 3 for Figure 2 Sectional view along AA;

[0027] Figure 4 A process diagram of a display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0029] IJP OLED (English full name: Ink-Jet Printing OLED, Chinese full name: Inkjet Printing Organic Light Emitting Diode) is a new display technology, which has physical advantages that LCD technology cannot match, with active light emission, true color, infinite contrast, zero delay, transparent display, flexible display, free display form and other characteristics, it is the next generation display technology that can replace liquid crystal display technology. Since IJP OLED devices are all-solid-state, non-vacuum devices, they have the characteristics of anti-vibration and low temperature resistance (-40℃), so they have a wide range of applications.

[0030] Taking large-size panels as an example, although the high-resolution display requirements can be met by improving the IJP OLED structure, it is difficult to achieve high-resolution display high-precision printing due to the limitation of printer equipment. Taking a 30-inch 8K display as an example, the pixel resolution is 7680*3840, the pixel density of the panel is 293ppi, and the RGB sub-pixel arrangement is designed. When the distance between adjacent dams is 10μm, the maximum width of the sub-pixel is only 18.8μm; at such a high-precision resolution, to meet the accuracy requirements of inkjet printing, the printer equipment must meet the printing volume <1pL (ink droplet diameter 12.4μm) and the printing movement accuracy <6μm; but the current nozzle can only spray a minimum droplet of 1pL, and the movement accuracy is 10μm, so the existing printer equipment cannot meet the needs of preparing large-size and high-resolution.

[0031] The embodiment of the present application provides a display panel 100 and a display device, wherein the display panel 100 can reduce the requirements for printer accuracy and nozzle droplet volume on the basis of meeting the high-resolution display requirements, so that the existing inkjet printer can also be applied to 8K and 16K displays. The following is a detailed description. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments.

[0032] In a first aspect, an embodiment of the present application provides a display panel 100. Figures 2 to 3 , Figure 2 A schematic diagram of sub-pixel arrangement of a display panel 100 provided in an embodiment of the present application; Figure 3 for Figure 2 Sectional view along AA.

[0033] The display panel 100 includes an array substrate 1, a pixel definition layer 2, and a light-emitting device layer 3; the pixel definition layer 2 is arranged on the array substrate 1, and the pixel definition layer 2 includes a plurality of first dams 21 and a plurality of second dams 22, the plurality of first dams 21 are arranged in a criss-cross pattern and define a plurality of first openings 23, and in the horizontal direction F1 or the vertical direction F2, two second dams 22 are arranged between two adjacent first dams 21, and each first opening 23 is divided into three second openings 24; the light-emitting device layer 3 includes a plurality of light-emitting devices 31, and the plurality of light-emitting devices 31 are respectively arranged in the plurality of second openings 24, wherein the light-emitting devices 31 in the three second openings 24 separated by each first opening 23 have different colors, and the light-emitting devices 31 in the second openings 24 on both sides of each first dam 21 have the same color.

[0034] The light-emitting device layer 3 also includes an anode layer 32 and a light-emitting functional layer 33. The anode layer 32 includes a plurality of anodes 321, and the plurality of anodes 321 are respectively arranged corresponding to the plurality of second openings 24. The light-emitting functional layer 33 includes a plurality of light-emitting layers 331, and each of the light-emitting layers 331 is located on the corresponding anode 321 to form a light-emitting device 31.

[0035] As mentioned above, please refer to Figure 1 , Figure 1 A schematic diagram of the sub-pixel arrangement of a display panel 100' provided by the prior art. As the resolution of existing large-size panels is getting higher and higher, the opening 23' of the sub-pixel is getting smaller and smaller, that is, the area of ​​each light-emitting layer 331' is getting smaller and smaller; the pixel definition layer 2' on the array substrate is provided with a plurality of openings 23', and each opening 23' needs to use an inkjet printer to print a light-emitting layer 331'. Since the sub-pixels formed by the light-emitting layer 331' are blue sub-pixels 311', green sub-pixels 312', and red sub-pixels 313' arranged in a circular pattern, when performing inkjet printing, the droplets formed by the nozzle of the printer device need to be smaller and smaller, and the movement accuracy of the nozzle is increasing, but the existing printer device cannot meet this requirement.

[0036] However, in the present application, the second dam 22 separates the first opening 23 into three second openings 24, and the light-emitting devices 31 in the three second openings 24 separated by each first opening 23 have different colors, which can reduce the pixel opening area of ​​a single sub-pixel, improve the pixel resolution, and meet the high-resolution display requirements; at the same time, the light-emitting devices 31 in the second openings 24 on both sides of each first dam 21 have the same color, and the printer device can simultaneously spray droplets of the same color into the two second openings 24 to form a light-emitting layer 331 of the same color; taking the nozzle single-time droplet volume of 1pL as an example: in the prior art, a single inkjet can only form a light-emitting layer 331′ of a sub-pixel, and the size of the pixel opening 23′ must be able to carry 1pL of ink droplets, which cannot meet the high-resolution requirements; while in the present application, a single inkjet simultaneously forms the light-emitting layer 331 of two of the light-emitting devices 31, so the size of the pixel opening only needs to carry 0.5pL of ink droplets. Compared with the prior art, the single light-emitting device 31 of the present application has a smaller pixel opening, which can further improve the pixel resolution and meet the high-resolution display requirements.

[0037] At the same time, in the prior art, since a single inkjet forms a light-emitting layer 331′ of a sub-pixel, the volume of a single ejected droplet must be less than 1pL and the printing movement accuracy must be less than 6um to meet the printing accuracy requirements, which places very high demands on the movement accuracy and inkjet volume of the printer; however, in the present application, since the light-emitting layer 331 corresponding to a single print can be applied to two light-emitting devices 31, the volume of a single ejected droplet and the printing movement accuracy can be twice that of the prior art, and the number of prints can be halved, that is, the printing movement accuracy of the printer device is reduced, and the volume of a single ejected droplet becomes larger, so that a printing device with a nozzle single ejection droplet volume of 1pL and a movement accuracy of 10μm can also be suitable for 8K and 16K displays.

[0038] The present application does not impose any specific restriction on the arrangement of the second dam 22. The second dam 22 may be arranged along the longitudinal direction F2, and two second dams 22 may be arranged between two adjacent first dams 21 in the transverse direction F1. The second dam 22 may be arranged along the transverse direction F1, and two second dams 22 may be arranged between two adjacent first dams 21 in the longitudinal direction F2.

[0039] The following description will be made by taking “the second dams 22 are arranged along the transverse direction F1 , and in the longitudinal direction F2 , two adjacent first dams 21 are provided with two intervals of the second dams 22 ” as an example.

[0040] In one embodiment, among the three second openings 24 separated by each first opening 23, the area of ​​the second opening 24 between two adjacent second dams 22 is set to S1, and the area of ​​the second opening 24 between the adjacent first dams 21 and the second dam 22 is set to S2, and S1 is greater than S2. It can be understood that the light-emitting devices 31 in the second openings 24 on both sides of the first dam 21 have the same color, and a single inkjet can form a light-emitting layer 331 of two light-emitting devices 31; however, the light-emitting device 31 in the second opening 24 between two adjacent second dams 22 has a different color from the light-emitting devices 31 on both sides thereof, and corresponding to the second opening 24, a single inkjet can only form a light-emitting layer 331 of one light-emitting device 3, and the area of ​​the second opening 24 between two adjacent second dams 22 can be set larger to facilitate printing by the printer.

[0041] It can be known that, compared with red and green, the luminous efficiency of the blue light emitting device is low, so the area of ​​the blue light emitting device 311 can be set to be larger than the area of ​​the red light emitting device 313 and the green light emitting device 312, thereby extending the service life of the blue light emitting device 311, and further improving the reliability of the display panel 100. Based on the above-mentioned "the second opening 24 between two adjacent second dams 22 has the largest area", the color of the light emitting device 31 in the second opening 24 between two adjacent second dams 22 can be set to blue, that is, the blue light emitting device 31 is set in the second opening 24 with a larger area, so that the blue light emitting device has the largest pixel opening area.

[0042] Correspondingly, between the adjacent first dam 21 and the second dam 22, the color of the light-emitting device 31 in the second opening 24 is set to red or green; although the area of ​​the second opening 24 between the adjacent first dam 21 and the second dam 22 is small, due to the high luminous efficiency of the red light-emitting device 313 and the green light-emitting device 312, the reliability of the display panel 100 can be guaranteed even if the red light-emitting device 313 and the green light-emitting device 312 are small in area.

[0043] See also Figure 2 , in the column direction, a row of blue light emitting devices 311, two rows of red light emitting devices 313, a row of blue light emitting devices 311, two rows of green light emitting devices 312... and so on are arranged in a cycle; by setting the area of ​​the second opening 24 between two adjacent second dams 22 to S1, the area of ​​the second opening 24 between the adjacent first dam 21 and the second dam 22 to S2, and S1 is equal to twice S2, so that the total area of ​​the second openings 24 of two adjacent red light emitters 313 is equal to the area of ​​the second opening 24 of the blue light emitting device 311, and the total area of ​​the second openings 24 of two adjacent red light emitters 313 is equal to the area of ​​the second opening 24 of the blue light emitting device 311, so that the volume of the droplets ejected by the printer in a single time can be set to be the same, thereby improving the inkjet stability of the printer.

[0044] It can be known that the color of the light emitting device 31 can be one of blue, red and green. The light emitting devices 31 in the three second openings 24 separated by each first opening 23 have different colors; that is, the light emitting devices 31 in the second openings 24 on both sides of the second dam 22 have different colors. In the thickness direction F3 of the display panel 100, the height of the second dam 22 is greater than the height of the first dam 21, which can prevent the mixing of inks containing different organic light emitting materials, and is conducive to preventing the occurrence of undesirable phenomena such as pixel light color deviation and color mixing. The height of the second dam 22 is set to 1μm~5μm.

[0045] At the same time, the light emitting devices 31 in the second openings 24 on both sides of each first dam 21 have the same color. Since the printer device can spray droplets of the same color into the two second openings 24 at the same time to form a light emitting layer of the same color, the first dam 21 only serves to distinguish the two sub-pixels without deliberately preventing the ink in the two second openings 24 from mixing colors. Therefore, the height of the first dam 21 can be smaller than the height of the second dam 22 to facilitate the nozzle to spray ink droplets. The height of the first dam 21 is set to 0.2μm to 2μm.

[0046] In the prior art, the dam is usually made of organic PDL material. Since the existing ink concentration is low, more ink is needed to achieve the target film thickness of the light-emitting layer 331', but it will also cause the ink of adjacent sub-pixels to bridge and cause poor color mixing. In order to solve this problem, the dam line width is usually increased; please refer to Figure 1 , usually the dam line width W in the horizontal direction F1′ 1 ' is greater than 12μm, and the bank line width W in the longitudinal direction F2' 2 ' is greater than 25μm; in this way, although poor color mixing can be avoided, it will lead to a decrease in the sub-pixel opening 23' rate and a smaller effective light-emitting area. Therefore, it is necessary to increase the operating current density and the operating voltage to achieve the display target brightness, resulting in an increase in the power consumption of the display panel 100'.

[0047] In one embodiment of the present application, please refer to Figure 2 and Figure 3 , the line width of the first dam 21 is smaller than the line width of the second dam 22; since the light emitting devices 31 in the second openings 24 on both sides of each first dam 21 have the same color, even if ink droplet offset and color mixing occur, there will be no problem of poor light emission; based on this, the line width of the first dam 21 can be set smaller, thereby increasing the aperture ratio of the sub-pixel and increasing the effective light emitting area. The light emitting devices 31 in the second openings 24 on both sides of the second dam 22 have different colors, and setting the line width of the second dam 22 larger can avoid poor color mixing.

[0048] Since the dam is usually made of organic PDL material, the line width of the dam is usually greater than 12μm due to the exposure accuracy of the organic photoresist material; while the line width of the dam made of inorganic photoresist material can be improved to 10μm; since the light-emitting devices 31 in the second opening 24 on both sides of the second dam 22 have different colors, the second dam 22 needs to be set to a sufficient thickness to avoid ink droplet bridging of adjacent sub-pixels; and the light-emitting devices 31 in the second opening 24 on both sides of each first dam 21 have the same color, so the first dam 21 can only play the role of dividing sub-pixels; by setting the material of the first dam 21 to include inorganic photoresist material; the material of the second dam 22 to include organic photoresist material; so that the first dam 21 and the second dam 22 meet their respective line width requirements. The width W of the second dam 22 1 The width W of the first dam 21 is set to 14 μm to 15 μm. 3 Less than or equal to 10μm.

[0049] The material of the first dam 21 includes one of silicon-based photoresist, metal oxide photoresist, silicon carbide, silicon nitride, titanium dioxide and molybdate photoresist; the material of the second dam 22 includes acrylic photoresist, polystyrene photoresist, phenolic resin photoresist, chemically amplified photoresist and electron beam photoresist.

[0050] Based on the structure of the display panel 100 described above, the present application also provides a method for manufacturing the display panel 100. Figure 4 The steps of manufacturing the display panel 100 are as follows:

[0051] S10: providing an array substrate 1;

[0052] S20: depositing an anode layer 32 on the array substrate 1, and then patterning the anode layer 32 through processes such as exposure, development, etching and patterning to form a plurality of anodes 321, wherein the anode layer 32 is set as an ITO / Ag / ITO layer and has a high reflective property;

[0053] S30: depositing a first photoresist layer on the anode layer 32, and then patterning the first photoresist layer through processes such as exposure, development, etching and patterning to form a plurality of first dams 21, wherein the first photoresist layer is made of an inorganic photoresist material;

[0054] S40: depositing a second photoresist layer on the anode layer 32, and then patterning the first photoresist layer through processes such as exposure, development, etching and patterning to form a plurality of second dams 22, wherein the second photoresist layer is made of an organic photoresist material;

[0055] S50: using an inkjet printer to print an organic material in the second opening 24 , and forming a light-emitting functional layer 33 in the plurality of second openings 24 ;

[0056] S60: evaporating a cathode layer on the light-emitting functional layer 33, wherein the cathode layer is made of Mg:Ag, the thickness of the cathode layer is set to 5nm to 30nm, and the cathode layer has good light transmittance;

[0057] S70: bonding and packaging the array substrate 1 and the cover plate.

[0058] Furthermore, the step S10 of providing an array substrate 1 further includes:

[0059] S101: providing a substrate, depositing a first metal layer on the substrate in sequence, and then patterning the first metal layer through processes such as exposure, development, etching, and patterning to form a metal light shielding layer, wherein the material of the first metal layer is Mo / Ti / Cu;

[0060] S102: Depositing a buffer layer covering the metal light shielding layer on the substrate, wherein the material of the buffer layer includes SiN X Or SiO X ;

[0061] S103: sequentially forming a semiconductor layer, a gate insulating layer, a gate layer, an interlayer insulating layer, and a source and drain electrode on the buffer layer;

[0062] S104: a resin layer is disposed on the source and drain electrodes, and then the resin layer is patterned through processes such as exposure and development to form a dielectric protection layer.

[0063] In the second aspect, the embodiment of the present application provides a display device. The display device includes a display panel 100; it should be noted that the display panel 100 is set as the above-mentioned display panel 100, that is, the display panel 100 includes all the technical features of the above-mentioned display panel 100, and the display device includes all the embodiments of the above-mentioned display panel 100, and also has all the technical effects of the above-mentioned embodiments, which will not be described one by one here.

[0064] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0065] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0067] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A display panel, characterized in that: include: An array substrate; a pixel definition layer, disposed on the array substrate, the pixel definition layer comprising a plurality of first dams and a plurality of second dams, the plurality of first dams being arranged in a crisscross pattern and defining a plurality of first openings, two second dams being arranged spaced apart between two adjacent first dams in a horizontal or vertical direction, and each of the first openings being divided into three second openings; A light emitting device layer, comprising a plurality of light emitting devices, wherein the plurality of light emitting devices are respectively and correspondingly arranged in the plurality of second openings; The light emitting devices in the three second openings separated by each of the first openings have different colors, and the light emitting devices in the second openings on both sides of each of the first dams have the same color.

2. The display panel according to claim 1, wherein: In the three second openings separated by each first opening, the second opening area between two adjacent second dams is set to S1, the second opening area between adjacent first dams and second dams is set to S2, and S1 is greater than S2.

3. The display panel according to claim 2, wherein: Between two adjacent second dams, the color of the light emitting device in the second opening is set to blue.

4. The display panel according to claim 2, wherein: Between the adjacent first dams and the second dams, the color of the light emitting device in the second opening is set to red or green.

5. The display panel according to claim 1, wherein: In each of the three second openings separated by the first opening, the second opening area between two adjacent second dams is set to S1, and the second opening area between adjacent first dams and second dams is set to S2, and S1 is equal to twice S2.

6. The display panel according to claim 1, wherein: In a thickness direction of the display panel, a height of the second dam is greater than a height of the first dam.

7. The display panel according to claim 1, wherein: A line width of the first dam is smaller than a line width of the second dam.

8. The display panel according to claim 7, wherein: The material of the first dam includes an inorganic photoresist material; The material of the second bank includes organic photoresist material.

9. The display panel according to claim 8, wherein: The width of the first dam is less than or equal to 10 μm; The width of the second bank is set to be 14 μm to 15 μm.

10. A display device, characterized in that: Comprising the display panel as claimed in any one of claims 1 to 9.

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