CN107230697B - Substrate with pixel structure, photoelectric device comprising same and printing method - Google Patents
Substrate with pixel structure, photoelectric device comprising same and printing method Download PDFInfo
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- CN107230697B CN107230697B CN201710344849.4A CN201710344849A CN107230697B CN 107230697 B CN107230697 B CN 107230697B CN 201710344849 A CN201710344849 A CN 201710344849A CN 107230697 B CN107230697 B CN 107230697B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/17—Passive-matrix OLED displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
- H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
- H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
- H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
Abstract
The application provides a substrate with a pixel structure, a photoelectric device comprising the substrate and a printing method. The pixel structure in the substrate with the pixel structure comprises pixel units with sub-pixels, each sub-pixel comprises a pixel isolation region and a light emitting region, the light emitting region is a region where a recess is formed by the pixel isolation structure located in the pixel isolation region and the substrate, the recess is used for containing liquid materials sprayed by an ink jet printing device, the bottom surface of the recess is in a shape of a first plane graph S1, the area of S2/the area of S1 is larger than or equal to 1 and smaller than or equal to 1.5, the S2 and the S1 have an intersection which is S1, the S2 is a conductive substrate which is not provided with the pixel isolation layer structure and is used for printing the sprayed liquid materials by the ink jet printing device at a certain height away from a test substrate and drying the sprayed liquid materials on the flat surface of the test substrate. The effect of improving the film uniformity of the light-emitting area and the light-emitting uniformity of the light-emitting device is achieved.
Description
Technical Field
The application relates to the technical field of pixel design, in particular to a substrate with a pixel structure, a photoelectric device with the pixel structure and a printing method.
Background
In recent years, a solution method gradually replaces a traditional evaporation method to become a research hotspot for manufacturing an electroluminescent device, the process of manufacturing the electroluminescent device mainly comprises the steps of arranging corresponding functional ink into corresponding pixels, wherein the pixels generally comprise a pixel defining layer and a light emitting area, the light emitting area is a pit formed by the pixel defining layer and a substrate in a surrounding mode, the pit is used for containing the ink, after the ink is dried, each film layer (each functional layer and each light emitting layer) is formed, and each film layer and an upper electrode and a lower electrode form the electroluminescent device.
The ink jet printing method among the solution methods is considered as one of the most promising methods because it is applicable to the production of large-scale light emitting devices. However, the light emitting device manufactured by the existing ink jet printing method is easy to have the phenomenon of uneven film layer due to the limitation of the design of the light emitting area of the pixel. The existing light emitting area is usually in a rounded rectangle, as shown in fig. 1, the light emitting area 1 'is separated by a pixel defining layer 2', the volume of ink which can be contained in the light emitting area 1 'is relatively large, a printing device is required to print a plurality of drops of ink 3' in the light emitting area to meet the setting requirement, in the process, the printed ink drops are overlapped in the light emitting area and need to spread by means of natural flow of the ink drops, ink drop blanks often appear at the upper and lower ends (approximate to a semicircle) of the light emitting area, or the solid content of the ink at the intersection part is higher than that at the non-intersection part, the design of the light emitting area can aggravate the non-uniform degree of the film layer, and the non-.
In the prior art, the proposal of adjusting the formula of the ink to improve the unevenness of the film layer is provided, but the improvement effect is not ideal, the regulator for adjusting the formula can bring adverse effect to the performances of luminescence, conductivity and the like of a luminescent device, and in addition, the complexity of the ink configuration process is increased due to the introduction of the adjustment process.
From the above, the problem that the existing light emitting device prepared by the inkjet printing method is prone to generating uneven film layer still needs to be further researched and solved.
Disclosure of Invention
The application mainly aims to provide a substrate with a pixel structure, a photoelectric device comprising the substrate and a printing method, so as to solve the problem that a light-emitting device prepared by the existing ink-jet printing method is easy to have uneven film layers.
In order to achieve the above object, according to one aspect of the present application, there is provided a substrate having a pixel structure, the pixel structure includes one or more pixel units, each pixel unit includes one or more sub-pixels, each sub-pixel includes a pixel isolation region and a light emitting region, the pixel isolation region is disposed on the substrate corresponding to the pixel isolation region, the light emitting region is a region where a recess is defined by the pixel isolation structure and the substrate, the recess is used for containing a liquid material ejected by an inkjet printing apparatus, a bottom surface of the recess of the light emitting region is shaped as a first planar pattern S1, and a size of S1 is determined by the following formula: the area of S2 is not more than 1.5/the area of S1 is not more than 1.5, and S2 and S1 have an intersection which is S1, wherein S2 is that the ink jet printing device prints a second plane pattern formed by the ejected liquid material after drying on the flat surface of the test substrate at a certain height from the test substrate, and the test substrate is a conductive substrate without a pixel structure.
Further, each pixel unit includes a plurality of sub-pixels, and the shape of the first planar patterns S1 corresponding to the light emitting areas is selected from one or more of a circle, an ellipse, and a regular n-polygon, where n is an integer greater than or equal to 6.
Further, in the case where the light emitting region is an ellipse, the length 2a of the major axis and the length 2b of the minor axis of the ellipse satisfy the following formula: b is less than or equal to a and less than or equal to 2 b.
Further, the specific height is a height from a bottom surface of the recess of the substrate having the pixel structure to the nozzle when the inkjet printing apparatus prints, and is preferably 0.4mm or more and 1mm or less.
Further, the volume of the corresponding recess of the light-emitting region in the sub-pixel is V1Volume of liquid material in a single spray is V2Then V is2≤V1≤10V2Preferably 1 pL.ltoreq.V2≤10pL。
Furthermore, the pixel isolation structure is a pixel defining layer, and the height of the pixel defining layer is greater than or equal to 1 μm and less than or equal to 5 μm.
Further, three sub-pixels are included in the pixel unit, and the three sub-pixels are respectively used for any one or more of red light, green light and blue light.
Furthermore, three sub-pixels located in the same pixel unit are arranged in parallel, each pixel unit is arranged in a matrix, the distance between two adjacent identical sub-pixels is d, d is 25.4mm/R, wherein,
r is pixel resolution, the unit is pixels per inch, x and y are the number of pixel units in the horizontal and vertical directions respectively, L is the length of the oblique side of a rectangular area where the matrix is located, and the unit of L is inches.
Furthermore, the three sub-pixels located in the same pixel unit are respectively a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in parallel in the first row, the third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in the second row in a staggered manner, and the third sub-pixel is aligned with the middle positions of the first sub-pixel and the second sub-pixel.
Further, the first planar patterns S1 corresponding to the light emitting regions of the first and second sub-pixels are circular, and the first planar patterns S1 corresponding to the light emitting regions of the third sub-pixel are elliptical; it is preferable that the first and second sub-pixels are for emitting one of red and green light, and the third sub-pixel is for emitting blue light.
According to a second aspect of the present application, there is provided an optoelectronic device comprising the above substrate having a pixel structure.
According to a third aspect of the present application, there is provided a printing method including: preparing the substrate with the pixel structure; and printing the liquid material in the depressions of the pixel structure by using an ink-jet printing device, and drying the liquid material to form a film layer.
By applying the technical scheme of the application, since the light emitting region in the pixel structure on the substrate is provided with the recess for containing the liquid material sprayed by the ink-jet printing device, the substrate with the pixel structure is suitable for ink-jet printing, the shape of the bottom surface of the recess is the first plane pattern S1, the same liquid material sprayed by the ink-jet printing device is printed at a certain height away from the test substrate in a single time, the pattern formed after drying on the flat surface of the test substrate is the second plane pattern S2, the size of S1 is determined by the second plane pattern S2, the area of S2/S1 is not more than 1.5, S2 and S1 have an intersection, the intersection is S1, then the area of S1 is close to S2, and S2 can completely cover S1. The shape (S1) of the concave bottom surface of the light-emitting area of the substrate with the pixel structure is close to the shape (S2) that the liquid material printed by ink jet is dry spread on the test substrate without the pixel structure, when the liquid material printed by ink jet falls into the light-emitting area with the concave of the pixel structure, the liquid material printed by ink jet is easier to spread naturally on the bottom surface of the light-emitting area and covers the whole bottom surface, thereby compared with the existing pixel adopting a rectangular or racetrack-shaped light-emitting area with large length-width ratio, the phenomenon that the light-emitting material sprayed in the process of ink jet printing cannot be spread completely in the light-emitting area or the phenomenon that the solid content of the light-emitting material is higher than that of the non-crossing part and the light-emitting material is spread unevenly when the light-emitting material is printed by dislocation for a plurality of times is avoided, therefore, the pixel structure is more suitable for, and then the problem that the film layer is uneven easily appears in the luminescent device prepared by the existing ink-jet printing method is solved.
In addition to the objects, features and advantages described above, other objects, features and advantages will be apparent from the present application. The present application will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 shows a schematic of a prior art ink jet printing ink to a light emitting area;
FIG. 2 is a schematic diagram of a light emitting region in an alternative pixel structure provided herein; and
fig. 3 shows a schematic diagram of a light emitting region in an alternative pixel cell provided herein.
Wherein the figures include the following reference numerals:
1', a light emitting region; 2', a pixel defining layer; 3', ink; 1. a light emitting region; 2. a pixel isolation structure; 4. a first sub-pixel; 5. a second sub-pixel; 6. and a third sub-pixel.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background, the light emitting device manufactured by the ink jet printing method in the prior art is prone to the problem of non-uniformity of the film layer. The applicant of the present application has studied in view of the above problems and proposed a substrate with a pixel structure, an optoelectronic device comprising the substrate, and a printing method, in the substrate with the pixel structure, the pixel structure includes one or more pixel units, each pixel unit includes one or more sub-pixels, each sub-pixel includes a pixel isolation region and a light emitting region, the pixel isolation region is disposed on the substrate corresponding to the pixel isolation region, the light emitting region is a region where a recess is defined by the pixel isolation structure and the substrate, the recess is used for containing a liquid material ejected by an inkjet printing apparatus, a bottom surface of the recess of the light emitting region is shaped as a first planar pattern S1, and a size of S1 is determined by the following formula: the area of S2 is not more than 1.5/the area of S1 is not more than 1.5, and S2 and S1 have an intersection which is S1, wherein S2 is a pattern formed by the inkjet printing device after the liquid material ejected by the inkjet printing device is dried on the flat surface of the test substrate in a single printing at a certain height from the test substrate, and the test substrate is a conductive substrate not provided with the pixel structure.
Compared with the substrate with the pixel structure, the test substrate in the above embodiment has the same structure except that the pixel structure is not present, and the surface of the test substrate is relatively smooth. The first planar pattern S1 represents the shape and size of the bottom surface of the recess of the light-emitting region, and the second planar pattern S2 represents the shape and size of the pattern formed by the inkjet printing apparatus printing the liquid material onto the flat surface of the test substrate at a single time and drying the liquid material, wherein the liquid material printed on the test substrate and the liquid material printed in the recess corresponding to the light-emitting region have the same chemical properties, and the volume of the liquid material ejected by the inkjet printing apparatus at a single time is the same.
The intersection of the S2 and the S1 is obtained by moving the S1 and the S2 graphs to a plane by a mathematical method, and the maximum intersection area is obtained; the area of the first planar pattern S1 is smaller than that of the second planar pattern S2, and when S1 and S2 are disposed in the same plane, S1 and S2 may overlap, or S2 may completely cover S1, or there may be a state where S1 is in S2, and any point of the edge and the inside of S1 is inside the enclosed region (including the edge) of S2. The bottom of the recess of the light-emitting region can be flat or slightly uneven, and the shape of the bottom surface can be that the bottom surface edge lines surround a pattern or the bottom surface projects a corresponding plane pattern.
With the present application, since the light emitting region in the pixel structure on the substrate has a recess for accommodating the liquid material ejected by the inkjet printing device, the substrate with the pixel structure is suitable for inkjet printing, and the shape of the bottom surface of the recess is the first planar pattern S1, the pattern formed by the inkjet printing device after the liquid material ejected by the inkjet printing device is printed once at a certain height from the test substrate and dried on the flat surface of the test substrate is the second planar pattern S2, the size of S1 is determined by the second planar pattern S2, the area of S2/S1 is 1.5 or less, and S2 and S1 have an intersection, which is S1, then the area of S1 is close to S2, and S2 can cover S1 completely. The shape (S1) of the concave bottom surface of the light-emitting area of the substrate with the pixel structure is close to the shape (S2) that the liquid material printed by ink jet is dry spread on the test substrate without the pixel structure, when the liquid material printed by ink jet falls into the light-emitting area with the concave of the pixel structure, the liquid material printed by ink jet is easier to spread naturally on the bottom surface of the light-emitting area and covers the whole bottom surface, thereby compared with the existing pixel adopting a rectangular or racetrack-shaped light-emitting area with large length-width ratio, the phenomenon that the light-emitting material sprayed in the process of ink jet printing cannot be spread completely in the light-emitting area or the phenomenon that the solid content of the light-emitting material is higher than that of the non-crossing part and the light-emitting material is spread unevenly when the light-emitting material is printed by dislocation for a plurality of times is avoided, therefore, the pixel structure is more suitable for, and then the problem that the film layer is uneven easily appears in the luminescent device prepared by the existing ink-jet printing method is solved.
The drying in the above embodiment may be any one or a combination of plural drying methods such as natural drying, vacuum drying, and thermal drying, and the above specific height is related to the type of the inkjet printing apparatus selected, and is preferably 0.4mm or more and 1mm or less. The substrate having the pixel structure in the present application may be a relatively square rectangular substrate, or may be a substrate having any shape and provided with the pixel structure, and the substrate is not limited to the material and type of the substrate in the prior art, and any material having a carrying capacity and provided with the pixel structure may be used as the material of the substrate, and may be regarded as the substrate in the present application.
The liquid material in the above embodiments may be a light emitting material for emitting light, such as a quantum dot light emitting material, or may be a material for transporting electrons or holes, or may be a material for injecting electrons or holes, and the liquid material may be other materials for preparing various film layers in a light emitting device, and those skilled in the art may select the materials according to actual needs.
It should be noted that the shape and size of the second planar pattern S2 are related to the surface energy of the test substrate, the chemical property of the liquid material for ink-jet printing, the surface tension and the specific height of the printing, wherein when the liquid material is ink-jet printed, different kinds of liquid materials may be sequentially and respectively printed on the concave portions of the light-emitting regions, and after drying, the film layers with different functions are obtained. At this time, the shape and size of the second plane pattern S2 are determined according to the shape and size of the plane patterns corresponding to the dried printed liquid materials, the area of the second plane pattern S2 may be selected as the average of the areas of the plane patterns, and the shape of S2 may be selected as the shape of the pattern corresponding to the middle area or the shape closest to a circle.
The pixel units in the above embodiments may be arranged in a matrix, and the pixel isolation structure is a structure for isolating each light emitting region, and may be a structure of a pixel defining layer, or other structures that can block or reduce the flow of light and/or liquid materials, so as to prevent the liquid materials in adjacent light emitting regions from being mixed with each other, and also prevent each light emitting region of a light emitting device having the pixel structure from forming mixed light.
As shown in fig. 2, the pixel structure includes one or more pixel units, each pixel unit includes a plurality of sub-pixels (each pixel unit includes three sub-pixels shown in fig. 2), each sub-pixel includes a pixel isolation region 2 and a light emitting region 1, the pixel isolation region is disposed on a substrate corresponding to the pixel isolation region, the light emitting region is a region where a recess surrounded by the pixel isolation structure and the substrate is located, the recess is used for containing a liquid material, and a plurality of first planar patterns S1 corresponding to the light emitting regions have a shape selected from one or more of a circle (as shown in fig. 2, where S1 is not shown in fig. 2), an ellipse, and a positive n-polygon, where n is an integer greater than or equal to 6.
Adopt this application, the shape design of the first plane S1 that corresponds the luminous region of pixel is circular, oval or regular n polygon (n is an integer, n is greater than or equal to 6), compare with current longer fillet rectangle, the shape is more close to the shape that ink droplet naturally tiled on the base plate when ink jet printing ink (liquid material), help the ink to evenly spread naturally to whole pixel luminous region after printing to luminous region, this pixel structure is more applicable to the technology preparation light emitting device of ink jet printing, the effect of the rete homogeneity that has realized improving luminous region and light emitting device' S luminescence homogeneity.
In a preferred embodiment, the light-emitting region may be formed in an elliptical shape, and if 2a is the length of the long axis of the elliptical light-emitting region and 2b is the length of the short axis thereof, the light-emitting region may be designed in a shape satisfying b ≦ a ≦ 2b, so that the elliptical region is not too long to allow the liquid material to spread naturally. More preferably, the light emitting region is designed to be circular, i.e., the major axis 2b and the minor axis 2a are equal in length, i.e., a is b. By adopting the above embodiment, the shape of the recessed bottom surface of the light emitting region (i.e., the first planar pattern S1) is set to be circular or elliptical, which is more conducive to natural spreading of ink after inkjet printing, and the processing process is simple, reducing the production cost.
The light emitting areas (corresponding to the first planar patterns S1) in each sub-pixel may be circular and have the same radius, so that the light emitting areas of the sub-pixels are designed to be circular with the same radius, and compared with the existing rounded rectangle design with large length-width ratio, the light emitting areas are more suitable for natural spreading of the liquid material printed by inkjet in the light emitting areas, and simultaneously, the light emitting areas are beneficial for batch ejection of the liquid material by inkjet printing equipment, and the mass production is more beneficial.
The above-mentioned pixel structure of this application is applicable to inkjet printing device, and the sunken liquid material that is used for holding that sends out light zone territory can be inkjet printing device spun, and the shape that sends out light zone territory can be by the liquid material that inkjet printing device single erupted, and the drying spread area at the plane carrier is confirmed, and the plane carrier is for not being provided with the base plate of pixel isolation structure, and the light zone area less than or equal to natural drying area is sent out to preferred. In an alternative embodiment, the volume of the corresponding recess of the light-emitting region in the sub-pixel is V1, and the volume of the liquid material ejected in a single ejection is V2Then V is2≤V1≤10V2Preferably 1 pL.ltoreq.V2≤10pL。
The following is a detailed description of the method for determining the maximum inner diameter (or area) of the light-emitting region of the pixel structure in the above embodiments:
the maximum inner diameter mentioned above refers to the maximum distance between two points in the first planar pattern S1 corresponding to the same light emitting region, for example, when the first planar pattern S1 corresponding to the light emitting region is an ellipse, the maximum inner diameter refers to the major axis 2a of the ellipse, when the light emitting region is a circle, the maximum inner diameter is the diameter of the circle, and when the first planar pattern S1 corresponding to the light emitting region is a regular n-polygon, the maximum inner diameter is the diameter of the circumscribed circle of the regular n-polygon. In determining the maximum inner diameter of the light-emitting region, the nozzle of the ink-jet printing apparatus for testing may be selected, a drop of ink (i.e., the liquid material) may be printed on the test substrate at the normal operating height thereof (the specific height at this time is the normal operating height), after the drop of ink is dried, the actual dried shape, which is the second planar pattern S2, may be observed with a microscope, the maximum inner diameter or area of the actual dried shape (i.e., the second planar pattern S2) may be measured, for example, if the actual dried shape (the second planar pattern) is a circle, the diameter length D of the circle may be measured, and finally the size of the light-emitting region (i.e., the first planar pattern S1) in the substrate having the pixel structure may be designed according to the measured D, the diameter 2a of the first planar pattern S1 corresponding to the light-emitting region may be designed to be equal to or less than D, and the area of 1 equal to or less than S2/the area of S1, and the intersection of S2 and S1 is S1, which is beneficial to natural spreading of ink drops, overcomes the defect that two ends of a strip-shaped pixel can not spread liquid drops, is suitable for preparing a film layer by an ink-jet printing method, and improves the uniformity of film layer preparation. More preferably, the diameter 2a of the light emitting region is preferably such that ink droplets ejected by inkjet printing can enter the light emitting region, that is, the maximum inner diameter of the light emitting region is not more than the maximum inner diameter of the drop, wherein the light emitting region is disposed in a pixel isolation structure, the pixel isolation structure may be a pixel defining layer, and preferably, the height of the pixel defining layer may be set to 1 to 5 micrometers.
In an alternative embodiment, three sub-pixels for emitting any one or more of red light, green light, and blue light, respectively, may be included in the pixel unit. For example, the three sub-pixels may be a first sub-pixel (red pixel structure R) for emitting red light, a second sub-pixel (green pixel structure G) for emitting green light, and a third sub-pixel (blue pixel structure B) for emitting blue light, respectively.
Three sub-pixels positioned in the same pixel unit are arranged in parallel, each pixel unit is arranged in a matrix, the distance between two adjacent same sub-pixels is d, the distance d is 25.4mm/R,
wherein R is the pixel resolutionThe unit is ppi (Pixel per inch), x and y are the number of Pixel units in the horizontal and vertical directions, respectively, L is the length of the oblique side of the rectangular area where the matrix is located, and the unit of L is inches.
For example, when a pixel having a resolution of 100dpi is to be printed, the distance in the x and y directions of the adjacent first sub-pixel emitting red light is 0.254mm, wherein the print pixel refers to printing of ink into the recess of the light emitting region in the sub-pixel.
In an alternative embodiment, one or more drops of ink may be printed in the light emitting region of the pixel structure. Assuming that the volume of the light emitting region is V1Volume of each drop of ink is V2Then there is V2≤V1≤10V2That is, the light emitting region of the sub-pixel may accommodate at least 1 to 10 drops of ink.
The method for designing the substrate corresponding to the light-emitting region is suitable for manufacturing substrates with various driving modes, and can be suitable for both Passive Matrix (Passive Matrix) and Active Matrix (Active Matrix) substrates, wherein the Passive Matrix can be a Passive Organic light emitting Diode (PM-OLED) or a Passive quantum dot light emitting Diode (PM-QLED), and includes three RGB sub-pixels, and the three pixels are arranged in an array, and the structure of the three pixels can be as shown in fig. 2.
In addition, the substrate corresponding to the Light Emitting region is also suitable for an Active Matrix/Organic Light Emitting Diode (AM-OLED) or an Active quantum dot Light Emitting Diode (AM-QLED), and the AM-OLED does not require a backlight module, a color filter, and other materials.
When the AM-OLED is used as the substrate, the arrangement structure of the three sub-pixels in the pixel unit can be arbitrarily adjusted and designed according to actual needs, and in order to improve the resolution of the pixel, in a preferred embodiment, the arrangement structure of the three sub-pixels in the pixel unit can be as follows: the three sub-pixels positioned in the same pixel unit are respectively a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel can be arranged in parallel in a first row, the third sub-pixel and the first sub-pixel and the second sub-pixel are arranged in a second row in a staggered mode, and the third sub-pixel is aligned with the middle positions of the first sub-pixel and the second sub-pixel. At this time, the sub-pixels are arranged in a "pin" or an inverted "pin" structure in the pixel unit, and the sub-pixels can be arbitrarily designated as required. In order to improve the light emitting effect of the pixel unit, in an alternative embodiment, the first planar patterns S1 corresponding to the light emitting regions of the first sub-pixel and the second sub-pixel are circular, and the first planar patterns S1 corresponding to the light emitting regions of the third sub-pixel are elliptical; preferably, the first and second sub-pixels are for emitting red and green light, and the third sub-pixel is for emitting blue light.
As shown in fig. 3, R and G sub-pixels (i.e., the first sub-pixel 4 and the second sub-pixel 5 emitting red light and green light) may be arranged in a row, both having a circular shape, and a B sub-pixel (i.e., the third sub-pixel 6 emitting blue light) may be arranged below the RG sub-pixels (the first sub-pixel 4 and the second sub-pixel 5), and the B sub-pixels may be arranged in an elliptical structure, and the ratio of each pixel may be adjusted by the arrangement of the light emitting region of the pixels as described above, and the arrangement may be adjusted according to the actual light emitting condition.
Through the embodiment, the mode of reducing the light emitting area of the sub-pixel is adopted, the effect of easy spreading is achieved, and after the area with the light emitting area is reduced, the number of the pixel structures can be relatively increased, and as the formula of the pixel resolution is known, the more the number of the pixel structures is arranged in the same size area, the higher the resolution is, so that the arrangement mode in the embodiment is also beneficial to improving the pixel resolution, wherein the formula of the pixel resolution is as follows:
where R is the Pixel resolution in ppi (Pixel per inch), x and y are the number of Pixel cells in the horizontal and vertical directions, respectively, and L is the diagonal length (in inches).
By adopting the substrate with the pixel structure, the shape and the size of the light-emitting area corresponding to the first plane graph S1 and the arrangement mode of the sub-pixels are skillfully designed, so that ink for ink-jet printing can be uniformly spread in the light-emitting area of the substrate, the subsequent complex process of uniform film layers is omitted, the problem that the film layers of a light-emitting device prepared by the existing ink-jet printing method are not uniform is solved fundamentally by adopting a simpler mode, and the effects of improving the film layer uniformity of the light-emitting area and the light-emitting uniformity of the light-emitting device are realized.
According to another aspect of the present application, there is also provided an optoelectronic device including the substrate having the pixel structure of the above embodiments.
The optoelectronic device in the above embodiments may be a light emitting device, such as an electroluminescent device or a photoluminescent device, and may be used in the display or lighting field, but is not limited to the above-listed fields, and other devices related to the pixel structure may also be applied.
With the above-described embodiment, since the light emitting region in the pixel structure on the substrate has the recess for holding the liquid material ejected by the ink jet printing apparatus, the substrate with the pixel structure is suitable for ink jet printing, and the shape of the bottom surface of the recess is the first planar pattern S1, the pattern formed after the liquid material ejected by the ink jet printing apparatus is printed once at a certain height from the test substrate and dried on the flat surface of the test substrate is the second planar pattern S2, the size of S1 is determined by the second planar pattern S2, the area of S2/S1 is 1.5 or less, and S2 and S1 have an intersection which is S1, the area of S1 is close to S2, and S2 can cover S1 entirely. The shape (S1) of the concave bottom surface of the light-emitting area of the substrate with the pixel structure is close to the shape (S2) that the liquid material printed by ink jet is dry spread on the test substrate without the pixel structure, when the liquid material printed by ink jet falls into the light-emitting area with the concave of the pixel structure, the liquid material printed by ink jet is easier to spread naturally on the bottom surface of the light-emitting area and covers the whole bottom surface, thereby compared with the existing pixel adopting a rectangular or racetrack-shaped light-emitting area with large length-width ratio, the phenomenon that the light-emitting material sprayed in the process of ink jet printing cannot be spread completely in the light-emitting area or the phenomenon that the solid content of the light-emitting material is higher than that of the non-crossing part and the light-emitting material is spread unevenly when the light-emitting material is printed by dislocation for a plurality of times is avoided, therefore, the pixel structure is more suitable for, and then the problem that the film layer is uneven easily appears in the luminescent device prepared by the existing ink-jet printing method is solved.
According to a third aspect of the present application, there is also provided a printing method including the steps of: preparing a substrate having a pixel structure in each of the above embodiments; and printing the liquid material in the depressions of the pixel structure by using an ink-jet printing device, and drying the liquid material to form a film layer.
The liquid material in the above embodiments may be a light emitting material for emitting light, such as a quantum dot light emitting material, or may be a material for transporting electrons or holes, or may be a material for injecting electrons or holes, and the liquid material may be other materials for preparing various film layers in a light emitting device, and those skilled in the art may select the materials according to actual needs. The film layer can be used in devices in the fields of display, illumination and solar cells.
In an alternative embodiment, before printing the liquid material in the recesses of the pixel structure using the inkjet printing apparatus, the printing method further includes: and adjusting the relative position of the inkjet printing device and the substrate, and more preferably, adjusting the distance from a nozzle of the inkjet printing device to the substrate to a specific height, wherein the specific height may be the height from the nozzle to the bottom surface of the recess of the substrate with the pixel structure when the inkjet printing device prints.
By the printing method, due to the adoption of the substrate which is more suitable for the pixel structure of the ink-jet printing device, when the liquid material is arranged by the ink-jet printing device, the liquid material is easier to spread naturally in the light emitting area of the pixel isolation structure, so that the printed liquid material is more uniformly spread after being dried, the uniformity of the film layer is improved, and the light emitting uniformity of the photoelectric device comprising the film layer prepared by the method is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (14)
1. A substrate with a pixel structure, the pixel structure comprising one or more pixel units, each pixel unit comprising one or more sub-pixels, each sub-pixel comprising a pixel isolation region and a light emitting region, the substrate corresponding to the pixel isolation region having a pixel isolation structure thereon, the light emitting region being a region where a recess is defined by the pixel isolation structure and the substrate,
the recess is used for containing liquid materials sprayed by an ink-jet printing device, the shape of the bottom surface of the recess of the light-emitting area is a first plane figure S1, and the size of S1 is determined by the following formula: the area of S2/the area of S1 is 1, and S2 has an intersection with S1, the intersection being S1,
the step S2 is a second planar pattern formed by the inkjet printing apparatus after the liquid material ejected by the inkjet printing apparatus is printed once at a specific height from the test substrate, the test substrate is a conductive substrate without a pixel structure, and the specific height is a height from a bottom surface of a recess of the substrate with the pixel structure when the inkjet printing apparatus prints.
2. The substrate having a pixel structure according to claim 1, wherein each of the pixel units includes a plurality of sub-pixels, and a shape of the first planar patterns S1 corresponding to the light emitting areas is one or more selected from a circle, an ellipse, and a regular n-polygon, where n is an integer greater than or equal to 6.
3. The substrate having a pixel structure according to claim 2, wherein in a case where the light emitting region is an ellipse, a length 2a of a major axis and a length 2b of a minor axis of the ellipse satisfy the following formula: b is less than or equal to a and less than or equal to 2 b.
4. The substrate having a pixel structure according to claim 1, wherein the specific height is greater than or equal to 0.4mm and less than or equal to 1 mm.
5. The substrate with pixel structure according to claim 1, wherein a volume of the corresponding recess of the light-emitting region in the sub-pixel is V1The volume of the liquid material sprayed in a single spray is V2Then V is2≤V1≤10V2。
6. The substrate with pixel structure of claim 5, wherein 1pL ≦ V2≤10pL。
7. The substrate with a pixel structure according to claim 1, wherein the pixel isolation structure is a pixel defining layer having a height of 1 μm or more and 5 μm or less.
8. The substrate having a pixel structure according to claim 1 or 2, wherein the pixel unit comprises three sub-pixels, and the three sub-pixels are respectively used for emitting any one or more of red light, green light and blue light.
9. The substrate with a pixel structure according to claim 8, wherein the three sub-pixels located in a same pixel unit are arranged in parallel, each pixel unit is arranged in a matrix, a distance between two adjacent same sub-pixels is d, d is 25.4mm/R,
wherein, R is pixel resolution, the unit is per inch of pixels, x and y are the number of pixel units in the horizontal and vertical directions respectively, L is the length of the oblique side of the rectangular area where the matrix is located, and the unit of L is inches.
10. The substrate with a pixel structure according to claim 8, wherein the three sub-pixels located in a same pixel unit are respectively a first sub-pixel, a second sub-pixel and a third sub-pixel, the first sub-pixel and the second sub-pixel are arranged in parallel in a first row, the third sub-pixel is arranged in a second row with the first sub-pixel and the second sub-pixel being staggered, and the third sub-pixel is aligned with a middle position of the first sub-pixel and the second sub-pixel.
11. The substrate having a pixel structure according to claim 10, wherein the first planar patterns S1 corresponding to the light emitting areas of the first and second sub-pixels are circular, and the first planar pattern S1 corresponding to the light emitting area of the third sub-pixel is elliptical.
12. The substrate having a pixel structure according to claim 10, wherein the first sub-pixel and the second sub-pixel are configured to emit one of red light and green light, and the third sub-pixel is configured to emit blue light.
13. An optoelectronic device comprising the substrate having a pixel structure according to any one of claims 1 to 12.
14. A method of printing, comprising:
preparing a substrate having a pixel structure according to any one of claims 1 to 12;
and printing a liquid material in the recess of the pixel structure by using an ink-jet printing device, and drying the liquid material to form a film layer.
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| KR102456458B1 (en) * | 2017-12-27 | 2022-10-18 | 엘지디스플레이 주식회사 | Electroluminescent Display Device |
| CN109119550B (en) * | 2018-09-11 | 2021-02-26 | 合肥鑫晟光电科技有限公司 | Ink-jet printing method, pixel structure, OLED substrate and display device |
| CN110265563B (en) * | 2019-06-20 | 2021-11-16 | 京东方科技集团股份有限公司 | Substrate for ink-jet printing light-emitting layer thereon, light-emitting device, and method for producing substrate |
| CN113593428A (en) * | 2021-07-20 | 2021-11-02 | Tcl华星光电技术有限公司 | Display panel and electronic device |
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| JP3628997B2 (en) * | 2000-11-27 | 2005-03-16 | セイコーエプソン株式会社 | Method for manufacturing organic electroluminescence device |
| US8906752B2 (en) * | 2011-09-16 | 2014-12-09 | Kateeva, Inc. | Polythiophene-containing ink compositions for inkjet printing |
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