Printing method

Abstract

An inkjet printing method is provided. The inkjet printing method includes: moving an inkjet head so as to discharge ink to a substrate including a plurality of print line regions; discharging ink to a first print line region and a second print line region among the plurality of print line regions; discharging ink to a third print line region and the second print line region among the plurality of print line regions; and discharging ink only to the first print line region.

Description

Technical Field

[0001] The implementation method relates to a printing method using an inkjet printer. Background Technology

[0002] Organic light-emitting display devices are display devices that can emit their own light and generate color images without the need for an additional light source such as a backlight.

[0003] Recently, organic light-emitting display devices including color conversion layers have been studied to improve display quality. The color conversion layer converts the wavelength of light emitted by the light-emitting element. Accordingly, the color conversion layer can convert the light emitted by the light-emitting element into light with various colors. The color conversion layer may include wavelength conversion particles such as quantum dots and scattering components.

[0004] Inkjet printing can be used to form color conversion layers that include quantum dots and scattering components. However, when forming color conversion layers using inkjet printing, the scattering components may deposit within the inkjet printer. Consequently, smudges may appear in a portion of the color conversion layer.

[0005] It will be understood that this background section of the technical section is intended in part to provide context useful for understanding the technology. However, this background section of the technical section may also include ideas, concepts, or understandings that were not part of what a person skilled in the art knew or understood prior to the effective application date of the subject matter disclosed herein. Summary of the Invention

[0006] The implementation provides an inkjet printing method that can prevent stains from appearing in a portion of the color conversion layer.

[0007] In an embodiment of the inkjet printing method according to the present disclosure, the inkjet printing method may include: moving an inkjet head to discharge ink onto a substrate including a plurality of print line regions; discharging ink into a first print line region and a second print line region among the plurality of print line regions; discharging ink into a third print line region and a second print line region among the plurality of print line regions; and discharging ink only into the first print line region.

[0008] In an embodiment, the inkjet printing method may further include discharging ink into the (n-1)th and nth printing line regions among a plurality of printing line regions, where n is a natural number greater than 3.

[0009] In an embodiment, the inkjet printing method may further include discharging ink only into the nth printing line area after discharging ink into the (n-1)th printing line area and the nth printing line area.

[0010] In one embodiment, when discharging ink into the (n-1)th and nth printing line areas, ink can be discharged into the (n-1)th printing line area via the first head of the inkjet head, and ink can also be discharged into the nth printing line area via the second head of the inkjet head.

[0011] In one implementation, when ink is discharged only to the nth printed line area, ink may be discharged only through the first head of the inkjet head, and ink may be discharged without passing through the second head of the inkjet head.

[0012] In one implementation, when ink is discharged only to the first printed line area, ink can be discharged only through the first head of the inkjet head.

[0013] In an embodiment, the inkjet printing method may further include: forming a first color filter, a second color filter, and a third color filter on a substrate; and forming a partition wall on the first color filter, the second color filter, and the third color filter, the partition wall including a plurality of openings.

[0014] In an implementation, the plurality of openings may include a first opening, a second opening, and a third opening, and at least one of the plurality of openings may be formed in at least one of the plurality of print line areas.

[0015] In one implementation, multiple openings may be repeatedly arranged in multiple print line areas.

[0016] In one embodiment, the inkjet head may include a blue ink printing head, a red ink printing head, and a green ink printing head. The blue ink printing head can discharge ink into a second opening, the green ink printing head can discharge ink into a third opening, and the red ink printing head can discharge ink into a first opening.

[0017] In one implementation, the ink discharged into multiple openings may include particles.

[0018] In an embodiment, the particles may include at least one of wavelength conversion particles and scattering components.

[0019] In one implementation, the blue ink printing head can dispense ink that includes scattering components.

[0020] In one implementation, each of the green ink printhead and the red ink printhead can discharge ink comprising wavelength conversion particles and scattering components.

[0021] In this embodiment, the scattering component may include titanium oxide.

[0022] In some embodiments, the wavelength conversion particles may include quantum dots.

[0023] In an embodiment of the inkjet printing method according to the present disclosure, the inkjet printing method may include: moving an inkjet head to discharge ink onto a substrate including a plurality of print line regions; discharging ink into a first print line region, a second print line region, and a third print line region among the plurality of print line regions; discharging ink into a fourth print line region among the plurality of print line regions, as well as the second and third print line regions; and discharging ink only into the first print line region.

[0024] In an embodiment, the inkjet printing method may further include dispensing ink only into the nth printing line region among a plurality of printing line regions, where n is a natural number greater than 4.

[0025] In one implementation, if ink is to be discharged only to the nth printed line area, ink can be discharged only through the first head of the inkjet head.

[0026] In one implementation, when ink is discharged only to the first printed line area, ink can be discharged only through the first head of the inkjet head.

[0027] According to embodiments of this disclosure, after ink is dispensed into the first and second printing line areas, ink can be dispensed into the second and third printing line areas. Accordingly, no stains may appear in the second printing line area.

[0028] According to embodiments of this disclosure, after ink is dispensed into the first printing line area and the second printing line area, ink can be dispensed only into the first printing line area. Accordingly, no stains may appear in the first printing line area. Attached Figure Description

[0029] The illustrative and non-limiting embodiments will be more clearly understood through the following detailed description taken in conjunction with the accompanying drawings.

[0030] Figure 1 This is a schematic diagram illustrating an embodiment of the inkjet printing method of this disclosure.

[0031] Figure 2 It is along Figure 1 A schematic cross-sectional view taken by line I-I'.

[0032] Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 This is a schematic diagram used to explain the inkjet printing method according to embodiments of the present disclosure.

[0033] Figure 9 , Figure 10 , Figure 11 and Figure 12 This is a schematic diagram used to explain an inkjet printing method according to another embodiment of the present disclosure. Detailed Implementation

[0034] The inkjet printing method according to embodiments will be explained in detail below with reference to the accompanying drawings. However, this disclosure may be implemented in different 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 thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0035] Unless the context clearly indicates otherwise, the singular forms “a”, “an” and “the” as used herein are intended to include the plural forms as well.

[0036] In the specification and claims, for purposes of meaning and interpretation, the word “and / or” is intended to include any combination of the words “and” and “or”. For example, “A and / or B” can be understood to mean “A, B, or A and B”. The words “and” and “or” can be used in combination or separately and are to be understood as equivalent to “and / or”. In the specification and claims, for purposes of meaning and interpretation, the phrase “at least one of…” is intended to include “at least one selected from the cluster of…”. For example, “at least one of A and B” can be understood to mean “A, B, or A and B”.

[0037] The term “overlap” or “overlapped” means that the first object may be above or below the second object or to the side of the second object, and vice versa. Additionally, the term “overlap” may include layer, stack, face or facing, extend over, cover or partially cover, or any other suitable terminology that will be understood and appreciated by one of ordinary skill in the art.

[0038] It will be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0039] The terms “comprises,” “comprising,” “includes,” and / or “including,” “has,” “have,” and / or “having,” and variations thereof, when used in this specification, indicate the presence of the stated features, integers, steps, operations, elements, components, and / or clusters thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or clusters thereof.

[0040] Taking into account the errors associated with measurements and a particular number of measurements (i.e., limitations of the measurement system), the terms "about," "approximately," or "substantially" (e.g., substantially similar), as used herein, include the stated values ​​and mean within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art. For example, "about" may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0041] The discussion of "optional" elements should not be used to interpret other elements as mandatory.

[0042] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be understood that, unless expressly defined herein, terms, such as those defined in common dictionaries, shall be interpreted as having the meaning consistent with their meaning in the context of the relevant field and shall not be interpreted in an idealized or overly formal sense.

[0043] Figure 1 This is a schematic diagram illustrating an embodiment of the inkjet printing method of this disclosure. Figure 2 It is along Figure 1 A schematic cross-sectional view taken by line I-I'.

[0044] Reference Figure 1 The substrate SUB may include openings. The openings may include a first opening OP1, a second opening OP2, and a third opening OP3. Ink comprising particles may be supplied to the first opening OP1, the second opening OP2, and the third opening OP3. The particles may include wavelength conversion particles, scattering components, and combinations thereof.

[0045] Inkjet printers can be used to supply ink. Inkjet printers may include inkjet heads containing nozzles (NZ).

[0046] In one embodiment, the inkjet head may include a first head P1. The first head P1 may include a first blue ink printing head BH1, a first green ink printing head GH1, and a first red ink printing head RH1. Each of the first blue ink printing head BH1, the first green ink printing head GH1, and the first red ink printing head RH1 may include a nozzle NZ. Each of the nozzles NZ can dispense ink.

[0047] In other embodiments, the inkjet head may include a first head P1 and a second head having elements substantially similar to the first head P1. Furthermore, the inkjet head may include a first head P1, a second head having elements substantially similar to the first head P1, and a third head having elements substantially similar to the first head P1.

[0048] An inkjet printer can supply ink to a first opening OP1, a second opening OP2, and a third opening OP3 via an inkjet head and a nozzle NZ included in the inkjet head. For example, an inkjet printer may include a first red ink printing head RH1 that supplies ink having a first component 231 to the first opening OP1, a first blue ink printing head BH1 that supplies ink having a second component 232 to the second opening OP2, and a first green ink printing head GH1 that supplies ink having a third component 233 to the third opening OP3.

[0049] Reference Figure 2 The substrate SUB may include a base substrate 210, a first color filter layer 222, a second color filter layer 224, a third color filter layer 226, a protective layer 240, and a partition wall 250. For example, a method of forming the substrate SUB may include: providing a base substrate 210; forming the first color filter layer 222, the second color filter layer 224, and the third color filter layer 226 on the base substrate 210; and forming a partition wall 250 including a first opening OP1, a second opening OP2, and a third opening OP3 on the first color filter layer 222, the second color filter layer 224, and the third color filter layer 226. Optionally, a protective layer 240 covering the first color filter layer 222, the second color filter layer 224, and the third color filter layer 226 may be added.

[0050] The first color filter layer 222, the second color filter layer 224, and the third color filter layer 226 may be formed to overlap with the corresponding light-emitting regions LA1, LA2, and LA3. For example, the first color filter layer 222 may be formed to overlap with the first light-emitting region LA1. The second color filter layer 224 may be formed to overlap with the second light-emitting region LA2. The third color filter layer 226 may be formed to overlap with the third light-emitting region LA3.

[0051] The colors of the light emitted from the first emitting region LA1, the second emitting region LA2, and the third emitting region LA3 can be determined by the first color filter layer 222, the second color filter layer 224, and the third color filter layer 226, respectively. In one embodiment, the first color filter layer 222 may be formed to overlap with the first emitting region LA1 and may emit red light. The second color filter layer 224 may be formed to overlap with the second emitting region LA2 and may emit blue light. The third color filter layer 226 may be formed to overlap with the third emitting region LA3 and may emit green light.

[0052] The protective layer 240 may be formed to cover the first color filter layer 222, the second color filter layer 224, and the third color filter layer 226. The protective layer 240 may include inorganic materials, such as silicon oxide, silicon nitride, etc.

[0053] The partition wall 250 may be formed and disposed on the protective layer 240. The partition wall 250 may correspond to one or more non-display areas BA. The partition wall 250 may form a space capable of containing ink. In an embodiment, the partition wall 250 may have a grid shape or a matrix shape in a plan view. The partition wall 250 may include organic materials such as epoxy resin, phenolic resin, acrylic resin, silicone resin, etc., or combinations thereof.

[0054] In one embodiment, the partition wall 250 may include a light-blocking material used as a black matrix. For example, at least a portion of the partition wall 250 may include a light-blocking material such as pigment, dye, carbon black, or a combination thereof.

[0055] The nozzle NZ included in the inkjet printer can discharge ink into the space formed in the partition wall 250. For example, ink having a first component 231 can be supplied in the first opening OP1, ink having a second component 232 can be supplied in the second opening OP2, and ink having a third component 233 can be supplied in the third opening OP3.

[0056] The first component 231 and the third component 233 may include wavelength conversion particles 231a and 233a, resin materials 231b and 233b, scattering components 231c and 233c, adhesive components, and solvents. For example, the first component 231 may include wavelength conversion particles 231a, resin material 231b, and scattering component 231c, and the third component 233 may include wavelength conversion particles 233a, resin material 233b, and scattering component 233c.

[0057] Wavelength conversion particles 231a and 233a may include quantum dots. Quantum dots may be defined as semiconductor materials having nanocrystals. Quantum dots may have specific band gaps depending on their composition and size. Accordingly, quantum dots may absorb light and emit light of different wavelengths. For example, the diameter of the quantum dot may be about 100 nm or less. In embodiments, the diameter of the quantum dot may be greater than or equal to about 1 nm and less than or equal to about 20 nm.

[0058] Quantum dots may include group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements, group IV compounds and combinations thereof.

[0059] For example, group II-VI compounds can be binary compounds selected from the cluster of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and mixtures thereof, or compounds selected from CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHg Ternary compounds in the clusters of S, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and mixtures thereof, and quaternary compounds selected from the clusters of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and mixtures thereof.

[0060] For example, III-V compounds can be binary compounds selected from the cluster of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and mixtures thereof; ternary compounds selected from the cluster of GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb and mixtures thereof; and quaternary compounds selected from the cluster of GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb, GaAlNP and mixtures thereof.

[0061] For example, group IV-VI compounds can be binary compounds selected from the cluster of SnS, SnSe, SnTe, PbS, PbSe, PbTe and mixtures thereof, ternary compounds selected from the cluster of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and mixtures thereof, and quaternary compounds selected from the cluster of SnPbSSe, SnPbSeTe, SnPbSTe and mixtures thereof.

[0062] For example, Group IV elements can be selected from the clusters of Si, Ge, and mixtures thereof. Group IV compounds can be binary compounds selected from the clusters of SiC, SiGe, and mixtures thereof.

[0063] For example, quantum dots can have a core-shell structure, consisting of a core and a shell surrounding the core. For example, the core and shell can contain different materials.

[0064] In one embodiment, wavelength conversion particles 231a included in the first composition 231 may include quantum dots that emit red light, and wavelength conversion particles 233a included in the third composition 233 may include quantum dots that emit green light.

[0065] Wavelength conversion particles 231a and 233a may be dispersed in resin materials 231b and 233b, respectively. For example, resin materials 231b and 233b may include epoxy resin, acrylic resin, phenolic resin, melamine resin, cardo resin, imide resin, or combinations thereof.

[0066] The first component 231 and the third component 233 may each include scattering components 231c and 233c. Scattering components 231c and 233c may be selectively omitted. In other words, the first component 231 and the third component 233 may selectively exclude scattering components 231c and 233c. Scattering components 231c and 233c can scatter light without substantially altering the wavelength of the light.

[0067] The scattering components 231c and 233c may include metal oxides or organic materials. For example, metal oxides may include titanium oxide, zirconium oxide, aluminum oxide, indium oxide, zinc oxide, tin oxide, or combinations thereof. Organic materials may include acrylic resins or polyurethane resins.

[0068] The adhesive components may include polymers, polymeric monomers, or combinations thereof. For example, the polymer may include an aromatic ring structure in its main chain. The aromatic ring structure may include benzene, biphenyl, fluorene, or combinations thereof. The polymeric monomer may include one or more carbon-carbon double bonds. For example, the polymeric monomer may include (meth)acrylate compounds.

[0069] Considering factors such as affinity with other components, dispersibility of quantum dots, viscosity, and boiling point, solvents can be appropriately selected or combined from a variety of materials.

[0070] Except for the exclusion of wavelength conversion particles 231a and 233a, the second composition 232 may include components substantially similar to those of the first composition 231 or the third composition 233. For example, the second composition 232 may include scattering component 232a, resin material 232b, adhesive component, and solvent.

[0071] The inkjet printer can supply ink comprising a first component 231, a second component 232, and a third component 233 corresponding to the first opening OP1, the second opening OP2, and the third opening OP3, respectively. Accordingly, the first opening OP1, the second opening OP2, and the third opening OP3 can be filled.

[0072] The first component 231, the second component 232, and the third component 233, respectively filled into the first opening OP1, the second opening OP2, and the third opening OP3, can be cured to form a color conversion layer and a compensation layer. For example, the first component 231, the second component 232, and the third component 233 can be thermocured and photocured.

[0073] Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 This is a schematic diagram used to explain the inkjet printing method according to embodiments of the present disclosure.

[0074] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 Ink can be dispensed onto the substrate SUB by performing the steps of placing the inkjet head IH on the substrate SUB and dispensing ink while moving the inkjet head IH. The substrate SUB can be compared with a reference. Figure 1 and Figure 2 The substrates described are essentially similar to those in the SUB.

[0075] The substrate SUB may include a first printed row area A1, a second printed row area A2, a third printed row area A3, a fourth printed row area A4, a fifth printed row area A5, a sixth printed row area A6, a seventh printed row area A7, and an eighth printed row area A8. The first printed row area A1, the second printed row area A2, the third printed row area A3, the fourth printed row area A4, the fifth printed row area A5, the sixth printed row area A6, the seventh printed row area A7, and the eighth printed row area A8 may each extend along a row direction (e.g., the x-axis direction) and may be arranged along a column direction (e.g., the y-axis direction).

[0076] Each of the first printed line area A1, the second printed line area A2, the third printed line area A3, the fourth printed line area A4, the fifth printed line area A5, the sixth printed line area A6, the seventh printed line area A7, and the eighth printed line area A8 can mean a unit area printed by ink emitted through the inkjet head IH.

[0077] An opening may be formed in each of the first printing line area A1, the second printing line area A2, the third printing line area A3, the fourth printing line area A4, the fifth printing line area A5, the sixth printing line area A6, the seventh printing line area A7, and the eighth printing line area A8 (for example, see reference). Figure 1 and Figure 2 The first opening OP1, the second opening OP2, and the third opening OP3 are described. In an embodiment, the openings may be formed in a repeating arrangement in each of the first printing line area A1, the second printing line area A2, the third printing line area A3, the fourth printing line area A4, the fifth printing line area A5, the sixth printing line area A6, the seventh printing line area A7, and the eighth printing line area A8. Discharging ink while moving the inkjet head IH may include discharging ink into and filling the openings formed in each of the first printing line area A1, the second printing line area A2, the third printing line area A3, the fourth printing line area A4, the fifth printing line area A5, the sixth printing line area A6, the seventh printing line area A7, and the eighth printing line area A8.

[0078] Figures 3 to 8 An embodiment is shown in which the substrate SUB includes a first printed row region A1, a second printed row region A2, a third printed row region A3, a fourth printed row region A4, a fifth printed row region A5, a sixth printed row region A6, a seventh printed row region A7, and an eighth printed row region A8. However, the number of printed row regions included in the substrate SUB is not limited to this. For example, the substrate SUB may include the first printed row region to the nth printed row region (where n may be a natural number 3 or greater).

[0079] The inkjet head IH may include a first head P1 and a second head P2 adjacent to the first head P1. The first head P1 may be connected to a reference... Figure 1 The first head P1 is described as substantially similar. The structure of the second head P2 is substantially similar to that of the first head P1. Accordingly, the inkjet head IH can synchronously discharge ink to two adjacent printing line areas.

[0080] Reference Figure 3 After placing an inkjet head IH for discharging ink into a substrate SUB comprising a first printed line area A1, a second printed line area A2, a third printed line area A3, a fourth printed line area A4, a fifth printed line area A5, a sixth printed line area A6, a seventh printed line area A7, and an eighth printed line area A8, ink can be discharged into the first printed line area A1 and the second printed line area A2 of the first printed line area A1, the second printed line area A2, the third printed line area A3, the fourth printed line area A4, the fifth printed line area A5, the sixth printed line area A6, the seventh printed line area A7, and the eighth printed line area A8 while the inkjet head IH is moving. For example, the first head P1 of the inkjet head IH can discharge ink into the first printed line area A1, and the second head P2 of the inkjet head IH can discharge ink into the second printed line area A2. The inkjet head IH can move repeatedly in the positive x-axis direction or the negative x-axis direction. The inkjet head IH can move repeatedly in the positive y-axis direction or the negative y-axis direction.

[0081] When ink is discharged into the first printing line area A1 and the second printing line area A2, components included in the ink may deposit in the inkjet head IH. Accordingly, the concentration of components in the ink discharged into the first printing line area A1 and the second printing line area A2 may be relatively increased. In other words, the concentration of components in the ink filling the openings included in the first printing line area A1 and the second printing line area A2 may be relatively increased. Consequently, stains may be visually identifiable in the first printing line area A1 and the second printing line area A2.

[0082] For example, refer to Figure 1 , Figure 2 and Figure 3 Each of the first printing line area A1 and the second printing line area A2 may include a first opening OP1, a second opening OP2, and a third opening OP3. Ink having a second composition 232 comprising a scattering component 232a and a resin material 232b may be discharged into the second opening OP2, which is one of the first opening OP1, the second opening OP2, and the third opening OP3. Ink having the second composition 232 may fill the second opening OP2.

[0083] Before ink containing the second component 232 can be dispensed, ink including the scattering component 232a can be filled into the inkjet head IH. If the ink containing the second component 232 is filled into the inkjet head IH for a relatively long time, the scattering component 232a may precipitate in the inkjet head IH. Accordingly, the concentration of the scattering component 232a in the ink containing the second component 232 dispensed into the second opening OP2 can be relatively increased. If ink with a relatively high concentration of scattering component 232a is filled into the second opening OP2, a stain can be visually identified in the second luminescent area LA2.

[0084] When ink containing the second component 232 is continuously ejected through the inkjet head IH, the concentration of the scattering component 232a in the ejected ink can gradually decrease and approach a normal concentration. Accordingly, the phenomenon of a relative increase in the concentration of the scattering component 232a in the ink due to precipitation of the scattering component 232a can be a problem in the initial stage of the inkjet printing method.

[0085] Reference Figure 4 After dispensing ink into the first printing line area A1 and the second printing line area A2, ink can be dispensed into the second printing line area A2 and the third printing line area A3 simultaneously with the movement of the inkjet head IH. For example, the first head P1 of the inkjet head IH can dispense ink into the second printing line area A2, and the second head P2 of the inkjet head IH can dispense ink into the third printing line area A3. The inkjet head IH can move repeatedly in either the positive x-axis direction or the negative x-axis direction. The inkjet head IH can also move repeatedly in either the positive y-axis direction or the negative y-axis direction.

[0086] When ink is discharged into the second printing line area A2 and the third printing line area A3, the components included in the ink may not precipitate in the inkjet head IH. Accordingly, the components included in the ink discharged through the inkjet head IH may have a normal concentration.

[0087] In this disclosure, after ink is discharged into the first printing line area A1 and the second printing line area A2, ink can be discharged into the second printing line area A2 and the third printing line area A3 simultaneously with the movement of the inkjet head IH. Accordingly, the concentration of components included in the ink discharged into the second printing line area A2 can be compensated.

[0088] Specifically, when ink is discharged into the first printed line area A1 and the second printed line area A2, the second head P2 of the inkjet head IH can discharge ink into the second printed line area A2 to fill half of the opening in the second printed line area A2. When ink is discharged into the second printed line area A2 and the third printed line area A3 while the inkjet head IH is moving, the first head P1 of the inkjet head IH can repeatedly discharge ink into the second printed line area A2 to fill the other half of the opening in the second printed line area A2.

[0089] Accordingly, the concentration of the composition in the ink filling the opening (e.g., the other half of the opening) can be relatively low. Therefore, the concentration of the composition in the ink filling the opening can be normal, and the stain may not be visually identifiable, or the stain may be less visible in the second printed line area A2.

[0090] Reference Figures 5 to 7 After dispensing ink into the second printing line area A2 and the third printing line area A3, ink can be dispensed into the third printing line area A3, the fourth printing line area A4, the fifth printing line area A5, the sixth printing line area A6, the seventh printing line area A7, and the eighth printing line area A8. The inkjet head IH can move repeatedly in the positive x-axis direction or the negative x-axis direction. The inkjet head IH can move repeatedly in the positive y-axis direction or the negative y-axis direction.

[0091] For example, the steps of discharging ink into the third printing line area A3 and the fourth printing line area A4, discharging ink into the fourth printing line area A4 and the fifth printing line area A5, discharging ink into the fifth printing line area A5 and the sixth printing line area A6, discharging ink into the sixth printing line area A6 and the seventh printing line area A7, discharging ink into the seventh printing line area A7 and the eighth printing line area A8, and discharging ink only into the eighth printing line area A8 can be performed sequentially. Therefore, in each of the third printing line area A3, the fourth printing line area A4, the fifth printing line area A5, the sixth printing line area A6, the seventh printing line area A7, and the eighth printing line area A8, the steps of discharging ink through the second head P2 and discharging ink through the first head P1 can be performed sequentially.

[0092] For example, when discharging ink into the seventh printing line area A7 and the eighth printing line area A8, the first head P1 of the inkjet head IH can discharge ink into the seventh printing line area A7, and the second head P2 of the inkjet head IH can discharge ink into the eighth printing line area A8.

[0093] For example, when ink is only discharged into the eighth printed line area A8, the first head P1 of the inkjet head IH can discharge ink into the eighth printed line area A8, while the second head P2 of the inkjet head IH may not discharge ink. During the period when ink is only discharged into the eighth printed line area A8, since the second head P2 does not discharge ink, components in the ink included in the second head P2 may precipitate. During the period when ink is only discharged into the eighth printed line area A8, since the first head P1 discharges ink, components in the ink included in the first head P1 may not precipitate.

[0094] Reference Figure 8 After dispensing ink only into the eighth printing line area A8, ink can be dispensing only into the first printing line area A1 while moving the inkjet head IH.

[0095] In one implementation, when ink is only discharged into the first printed line area A1, only the first head P1 of the inkjet head IH can discharge ink. For example, when ink is only discharged into the first printed line area A1, the first head P1 can discharge ink into the first printed line area A1, and the second head P2 may not discharge ink.

[0096] In this disclosure, after ink is discharged only into the eighth print line region A8, ink can be discharged only into the first print line region A1 while the inkjet head IH is moved. Accordingly, the concentration of components included in the ink discharged into the first print line region A1 can be compensated.

[0097] Figure 9 , Figure 10 , Figure 11 and Figure 12 This is a schematic diagram used to explain an inkjet printing method according to another embodiment of the present disclosure. (The following can be omitted:) Figures 1 to 8 The same explanation applies to the configuration in [the document / platform].

[0098] Reference Figure 9 , Figure 10 , Figure 11 and Figure 12 Ink can be dispensed onto the substrate SUB by performing the steps of placing the inkjet head IH on the substrate SUB and dispensing ink while moving the inkjet head IH. The substrate SUB can be compared with a reference. Figure 1 and Figure 2 The substrates described are essentially similar to those in the SUB.

[0099] The substrate SUB may include a first printed row area A1, a second printed row area A2, a third printed row area A3, a fourth printed row area A4, a fifth printed row area A5, a sixth printed row area A6, a seventh printed row area A7, and an eighth printed row area A8. The first printed row area A1, the second printed row area A2, the third printed row area A3, the fourth printed row area A4, the fifth printed row area A5, the sixth printed row area A6, the seventh printed row area A7, and the eighth printed row area A8 may each extend along a row direction (e.g., the x-axis direction) and may be arranged along a column direction (e.g., the y-axis direction).

[0100] An opening may be formed in each of the first printing line area A1, the second printing line area A2, the third printing line area A3, the fourth printing line area A4, the fifth printing line area A5, the sixth printing line area A6, the seventh printing line area A7, and the eighth printing line area A8 (for example, see reference). Figure 1 and Figure 2 The first opening OP1, the second opening OP2, and the third opening OP3 are described.

[0101] Figures 9 to 12 An embodiment is shown in which the substrate SUB includes a first printed line region A1, a second printed line region A2, a third printed line region A3, a fourth printed line region A4, a fifth printed line region A5, a sixth printed line region A6, a seventh printed line region A7, and an eighth printed line region A8. However, the number of printed line regions included in the substrate SUB is not limited to this. For example, the substrate SUB may include the first printed line region to the nth printed line region (where n may be a natural number of 4 or greater).

[0102] The inkjet head IH may include a first head P1, a second head P2 adjacent to the first head P1, and a third head P3 adjacent to the second head P2 and spaced apart from the first head P1. The first head P1 may be referenced... Figure 1 The first head P1 is described as substantially similar. The structure of the second head P2 is substantially similar to that of the first head P1. The structure of the third head P3 is substantially similar to that of the first head P1. Accordingly, the inkjet head IH can simultaneously dispense ink into three adjacent printing line areas.

[0103] Reference Figure 9After placing an inkjet head IH for discharging ink into a substrate SUB comprising a first printed line area A1, a second printed line area A2, a third printed line area A3, a fourth printed line area A4, a fifth printed line area A5, a sixth printed line area A6, a seventh printed line area A7, and an eighth printed line area A8, ink can be discharged into the first printed line area A1, the second printed line area A2, and the third printed line area A3, among the first printed line area A1, the second printed line area A2, the third printed line area A3, the fourth printed line area A4, the fifth printed line area A5, the sixth printed line area A6, the seventh printed line area A7, and the eighth printed line area A8, while the inkjet head IH is moved. For example, the first head P1 of the inkjet head IH can discharge ink into the first printed line area A1, the second head P2 of the inkjet head IH can discharge ink into the second printed line area A2, and the third head P3 of the inkjet head IH can discharge ink into the third printed line area A3. The inkjet head IH can move repeatedly in the positive x-axis direction or the negative x-axis direction. The inkjet head IH can move repeatedly in the positive y-axis direction or the negative y-axis direction.

[0104] When ink is discharged into the first printing line area A1, the second printing line area A2, and the third printing line area A3, components included in the ink may precipitate in the inkjet head IH. Accordingly, the concentration of components in the ink discharged into the first printing line area A1, the second printing line area A2, and the third printing line area A3 may be relatively increased. In other words, the concentration of components in the ink filling the openings included in the first printing line area A1, the second printing line area A2, and the third printing line area A3 may be relatively increased. Consequently, blemishes may be visually identifiable in the first printing line area A1, the second printing line area A2, and the third printing line area A3.

[0105] Reference Figure 10 After dispensing ink into the first printing line area A1, the second printing line area A2, and the third printing line area A3, ink can be dispensed into the second printing line area A2, the third printing line area A3, and the fourth printing line area A4. For example, the first head P1 of the inkjet head IH can dispense ink into the second printing line area A2, the second head P2 of the inkjet head IH can dispense ink into the third printing line area A3, and the third head P3 of the inkjet head IH can dispense ink into the fourth printing line area A4. The inkjet head IH can move repeatedly in the positive x-axis direction or the negative x-axis direction. The inkjet head IH can move repeatedly in the positive y-axis direction or the negative y-axis direction.

[0106] When ink is discharged into the second printing line area A2, the third printing line area A3, and the fourth printing line area A4, the components included in the ink may not precipitate in the inkjet head IH. Accordingly, the components included in the ink discharged through the inkjet head IH can have a normal concentration. Accordingly, the concentration of the components included in the ink discharged into the second printing line area A2 and the third printing line area A3 can be compensated.

[0107] Reference Figure 11 After dispensing ink into the second printing line area A2, the third printing line area A3, and the fourth printing line area A4, ink can be dispensed only into the eighth printing line area A8. The inkjet head IH can move repeatedly in either the positive x-axis direction or the negative x-axis direction. The inkjet head IH can also move repeatedly in either the positive y-axis direction or the negative y-axis direction.

[0108] For example, when ink is only discharged into the eighth printed line area A8, the first head P1 of the inkjet head IH can discharge ink into the eighth printed line area A8, while the second head P2 and the third head P3 may not discharge ink. During the period when ink is only discharged into the eighth printed line area A8, since the second head P2 and the third head P3 do not discharge ink, components included in the ink in the second head P2 and the third head P3 may precipitate. During the period when ink is only discharged into the eighth printed line area A8, since the first head P1 discharges ink, components included in the ink in the first head P1 may not precipitate.

[0109] Reference Figure 12 After dispensing ink only into the eighth printing line area A8, ink can be dispensing only into the first printing line area A1 while moving the inkjet head IH.

[0110] In one implementation, when ink is discharged only into the first printed line area A1, only the first head P1 of the inkjet head IH can discharge ink. For example, when ink is discharged only into the first printed line area A1, the first head P1 can discharge ink into the first printed line area A1, while the second head P2 and the third head P3 may not discharge ink.

[0111] In this disclosure, after ink is discharged only into the eighth print line region A8, ink can be discharged only into the first print line region A1 while the inkjet head IH is moved. Accordingly, the concentration of components included in the ink discharged into the first print line region A1 can be compensated.

[0112] This disclosure can be applied to the manufacturing processes of various display devices. For example, this disclosure can be applied to the manufacturing processes of various display devices such as display devices for vehicles, ships and aircraft, portable communication devices, display devices for exhibition or information broadcasting, medical display devices, etc.

[0113] Although the inkjet printing method according to embodiments has been described with reference to the accompanying drawings, the embodiments shown are examples and can be modified and altered by those skilled in the art without departing from the spirit of this disclosure.

Claims

1. An inkjet printing method, comprising: The first step is to move the inkjet head to discharge ink onto a substrate that includes multiple printed rows. The second step involves discharging ink into the first printing line area among the plurality of printing line areas through the first head of the inkjet head, and discharging ink into the second printing line area among the plurality of printing line areas through the second head of the inkjet head. The third step is to discharge ink into the third printing line area and the second printing line area among the plurality of printing line areas; as well as After the third step, ink is dispensed only into the first printed line area. In the case where ink is discharged only into the first printed line area, the ink is discharged only through the first head of the inkjet head, and the ink is not discharged through the second head of the inkjet head.

2. The inkjet printing method according to claim 1 further includes: Ink is dispensed into the (n-1)th and nth printing line regions among the plurality of printing line regions, where n is a natural number greater than 3.

3. The inkjet printing method according to claim 2 further includes: After dispensing the ink into the (n-1)th and nth printing line areas, ink is dispensed only into the nth printing line area.

4. The inkjet printing method according to claim 3, wherein, When the ink is discharged into the (n-1)th printed line area and the nth printed line area... The ink is discharged into the (n-1)th printed line area through the first head of the inkjet head, and The ink is discharged into the nth printing line area through the second head of the inkjet head.

5. The inkjet printing method according to claim 3, wherein, In the case where the ink is only discharged into the nth printed row area. The ink is discharged only through the first head of the inkjet head, and The ink is not discharged through the second head of the inkjet head.

6. An inkjet printing method, comprising: The first step is to move the inkjet head to discharge ink onto a substrate that includes multiple printed rows. The second step involves discharging ink into the first printing line area among the plurality of printing line areas through the first head of the inkjet head, discharging ink into the second printing line area among the plurality of printing line areas through the second head of the inkjet head, and discharging ink into the third printing line area among the plurality of printing line areas through the third head of the inkjet head. The third step is to discharge ink into the fourth printing line area, the second printing line area, and the third printing line area among the plurality of printing line areas; as well as After the third step, ink is dispensed only into the first printed line area. In the case where ink is discharged only into the first printed line area, the ink is discharged only through the first head of the inkjet head, and the ink is not discharged through the second head and the third head of the inkjet head.

7. The inkjet printing method according to claim 6, further comprising: Ink is dispensed only into the nth printing line region among the plurality of printing line regions, where n is a natural number greater than 4.

8. The inkjet printing method according to claim 7, wherein, In the case where the ink is only discharged into the nth printed row area. The ink is discharged only through the first head of the inkjet head.

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