CN219650845U - Ink jet printing apparatus - Google Patents

Ink jet printing apparatus Download PDF

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Publication number
CN219650845U
CN219650845U CN202320637565.5U CN202320637565U CN219650845U CN 219650845 U CN219650845 U CN 219650845U CN 202320637565 U CN202320637565 U CN 202320637565U CN 219650845 U CN219650845 U CN 219650845U
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CN
China
Prior art keywords
chamber
corner
ink
printing apparatus
inkjet printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202320637565.5U
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Chinese (zh)
Inventor
韩政洹
朴锺镐
梁泰镐
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Samsung Display Co Ltd
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Samsung Display Co Ltd
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Filing date
Publication date
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Publication of CN219650845U publication Critical patent/CN219650845U/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14016—Structure of bubble jet print heads
    • B41J2/14032—Structure of the pressure chamber
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

The inkjet printing apparatus of the present utility model includes: an objective table; and a print head located at an upper portion of the stage and including a chamber and a nozzle for ejecting ink from the chamber. When viewed on one side, the chamber comprises: a first side, a second side, a third side, and a fourth side; a first corner contiguous with the first edge and the second edge and having a rounded shape; and a second corner, contiguous with the second side and the third side, and having a rounded shape.

Description

Ink jet printing apparatus
Technical Field
The present utility model relates to an inkjet printing apparatus.
Background
In a thin film manufacturing process of a display device (for example, a manufacturing process of a light emitting layer or the like), an Inkjet printing (Inkjet printing) process of forming a thin film having a desired morphology by ejecting ink to a surface of a target object may be used. An inkjet printing apparatus can print a thin film having a desired pattern on a substrate by generating ink droplets in nozzles of a print head and ejecting the ink droplets to predetermined positions of the substrate as a target object.
Disclosure of Invention
Technical problem to be solved
An object of the present utility model is to provide an inkjet printing apparatus in which uniformity of particle concentration of ejected ink is improved.
Solution method
An inkjet printing apparatus according to an embodiment of the utility model may include: an objective table; and a print head located at an upper portion of the stage and including a chamber and a nozzle for ejecting ink from the chamber. In an embodiment, the chamber may comprise, when viewed on one side: a first side, a second side, a third side, and a fourth side; a first corner contiguous with the first and second sides and having a rounded shape; and a second corner contiguous with the second side and the third side and having a rounded shape.
In an embodiment, the first corner may be arranged on one side of the chamber and the second corner may be arranged on the other side of the chamber.
In an embodiment, the first side and the third side may be parallel to each other, the second side and the fourth side may be parallel to each other, and the second side and the fourth side may be perpendicular to the first side and the third side.
In an embodiment, the chamber may include: a first chamber component comprising the first, second, third and fourth sides, the first corner, and the second corner; a second chamber component comprising a fifth side, a sixth side, a seventh side, and an eighth side; and a filter member disposed between the first chamber member and the second chamber member.
In an embodiment, the second chamber component may further comprise, when viewed on the one side: a third corner that meets the fifth side and the sixth side and extends in an oblique direction with respect to the fifth side and the sixth side; and a fourth corner that meets the sixth side and the seventh side and extends in an oblique direction with respect to the sixth side and the seventh side.
In an embodiment, the second chamber component may further comprise, when viewed on the one side: a third corner contiguous with the fifth and sixth sides and having a rounded shape; and a fourth corner, contiguous with the sixth and seventh sides and having a rounded shape.
In an embodiment, the third corner may be arranged on one side of the second chamber component and the fourth corner may be arranged on the other side of the second chamber component.
In an embodiment, the fifth side and the seventh side may be parallel to each other, the sixth side and the eighth side may be parallel to each other, and the sixth side and the eighth side may be perpendicular to the fifth side and the seventh side.
In an embodiment, the width of the second chamber part in one direction may increase from the side portion toward the central portion.
In an embodiment, the first chamber component and the second chamber component may be integrally formed.
In an embodiment, the nozzle may be arranged in a lower portion of the first chamber part.
An inkjet printing apparatus according to an embodiment of the utility model may include: an objective table; and a print head located at an upper portion of the stage and including a chamber and a nozzle for ejecting ink from the chamber. In an embodiment, the chamber may comprise, when viewed on one side: a first side, a second side, a third side, and a fourth side; a first corner contiguous with the first and second sides and extending in an oblique direction relative to the first and second sides; and a second corner that meets the second side and the third side and extends in an oblique direction with respect to the second side and the third side.
In an embodiment, the first corner may be arranged on one side of the chamber and the second corner may be arranged on the other side of the chamber.
In an embodiment, the first side and the third side may be parallel to each other, the second side and the fourth side may be parallel to each other, and the second side and the fourth side may be perpendicular to the first side and the third side.
In an embodiment, the chamber may include: a first chamber component comprising the first, second, third and fourth sides, the first corner, and the second corner; a second chamber component comprising a fifth side, a sixth side, a seventh side, and an eighth side; and a filter member disposed between the first chamber member and the second chamber member.
In an embodiment, the second chamber component may further comprise, when viewed on the one side: a third corner that meets the fifth side and the sixth side and extends in an oblique direction with respect to the fifth side and the sixth side; a fourth corner that meets the sixth side and the seventh side and extends in an oblique direction with respect to the sixth side and the seventh side.
In an embodiment, the second chamber component may further comprise, when viewed on the one side: a third corner contiguous with the fifth and sixth sides and having a rounded shape; and a fourth corner, contiguous with the sixth and seventh sides and having a rounded shape.
In an embodiment, the third corner may be arranged on one side of the second chamber component and the fourth corner may be arranged on the other side of the second chamber component.
In an embodiment, the fifth side and the seventh side may be parallel to each other, the sixth side and the eighth side may be parallel to each other, and the sixth side and the eighth side may be perpendicular to the fifth side and the seventh side.
In an embodiment, the width of the second chamber part in one direction may increase from the side portion toward the central portion.
Advantageous effects
The lower side corners of the chambers included in the print head of the inkjet printing apparatus according to an embodiment of the present utility model may have a rounded shape or a shape extending in an oblique direction. Thus, uniformity of the concentration of particles included in the ink in the chamber of the print head can be improved.
However, the effects of the present utility model are not limited to the above effects, and various extensions can be made within the scope not departing from the spirit and scope of the present utility model.
Drawings
Fig. 1 is a schematic perspective view for explaining an inkjet printing apparatus according to an embodiment of the present utility model.
Fig. 2 is a diagram for explaining an inkjet printing apparatus according to an embodiment of the present utility model.
Fig. 3a is a diagram showing a print head according to a comparative example.
Fig. 3b is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 3a through a nozzle.
Fig. 4a is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2.
Fig. 4b is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 4a through a nozzle.
Fig. 5a is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2.
Fig. 5b is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2.
Fig. 5c is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 5a through a nozzle.
Fig. 6a is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2.
Fig. 6b is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 6a through a nozzle.
Fig. 7 is a diagram for explaining an inkjet printing apparatus according to an embodiment of the present utility model.
Fig. 8 is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 7.
Description of the reference numerals
10. 10_1: ink jet printing apparatus
100: object stage
200. 200_1, 200_2, 200_3, 200_4: printing head
210. 210_1, 210_2, 210_3, 210_4: chamber chamber
211. 211_1: first chamber component
212. 212_1, 212_2: second chamber component
213: filtering component
220: nozzle
300: substrate board
400: liquid storage device
ILT: inflow port
And (3) an OLT: outflow opening
SPA: sub-pixel region
Detailed Description
In describing the various drawings, like reference numerals are used for like components. In the drawings, the size of the structures is shown exaggerated compared to the actual size for the sake of clarity of the utility model. The terms "first", "second", etc. may be used to describe various components, however, the above components should not be limited by the above terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component, and similarly, a second component may also be named a first component, without departing from the scope of the claims of the present utility model. The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.
In the present utility model, it should be understood that the terms "comprises" or "comprising," etc., are intended to specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
Furthermore, when a portion is referred to as being "connected" to another portion, this includes not only the case of direct connection but also the case of connection with other elements being interposed therebetween.
Further, when a portion referred to as a layer, a film, a region, a plate, or the like is "on" another portion, this includes not only the case of "directly on" another portion but also the case of further intervening portions. In addition, in this specification, when a portion called a certain layer, film, region, plate, or the like is formed "on" another portion, the above-described forming direction is not limited to the upper direction, but includes a case of forming in the side direction or the lower direction. Conversely, when a portion referred to as a layer, film, region, plate, or the like is "under" another portion, this includes not only the case of "directly under" the other portion but also the case of further intervening portions.
Hereinafter, preferred embodiments of the present utility model will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and repeated description of the same components is omitted.
Fig. 1 is a schematic perspective view for explaining an inkjet printing apparatus according to an embodiment of the present utility model. Fig. 2 is a diagram for explaining an inkjet printing apparatus according to an embodiment of the present utility model. Fig. 3a is a diagram showing a print head according to a comparative example. Fig. 3b is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 3a through a nozzle.
Meanwhile, a comparison graph showing the particle concentration according to the relative position in the second direction DR2 for the ink ejected through the nozzle 220_c of the print head 200_c according to the comparative example of fig. 3a is shown in fig. 3 b.
Referring to fig. 1 and 2, an inkjet printing apparatus 10 according to an embodiment of the present utility model may include a stage 100 and a printhead 200 that ejects ink onto a substrate 300. According to an embodiment, the inkjet printing apparatus 10 may also include a reservoir (reservoir) 400.
The stage 100 may support the substrate 300 and may be formed of a rigid material. However, the material of the stage 100 is not limited thereto. In an exemplary embodiment, the stage 100 may have a rectangular parallelepiped shape, but the shape of the stage 100 is not limited thereto.
A substrate 300 may be disposed on the stage 100. For example, the substrate 300 may be disposed on a surface of the stage 100. Here, the above-described one surface of the stage 100 on which the substrate 300 is disposed may be parallel to a plane defined by the second direction axis corresponding to the second direction DR2 and the third direction axis corresponding to the third direction DR 3. The normal direction of the surface of the stage 100 where the substrate 300 is disposed, that is, the thickness direction of the stage 100 (or the substrate 300) is defined as a first direction DR1. However, the first, second, and third directions DR1, DR2, and DR3 are only examples, and the first, second, and third directions DR1, DR2, and DR3 may be converted into other directions as a relative concept.
The substrate 300 may include a base substrate, a thin film transistor, an insulating layer, and the like. The base substrate may be made of transparent glass, plastic sheet, silicon, or the like, but the material of the base substrate is not limited thereto.
The substrate 300 may be a unit display substrate or a mother substrate before being cut into a plurality of unit display substrates. The substrate 300 may be one substrate 300, but may also include a plurality of substrates stacked.
The substrate 300 may include a plurality of sub-pixel regions SPA. For example, the sub-pixel region SPA may include a region in which sub-pixels such as red (red) pixels, green (green) pixels, and blue (blue) pixels are arranged. However, this is merely exemplary, and the present utility model is not limited thereto. For example, the sub-pixel region SPA may also include a region in which sub-pixels such as magenta (magenta) pixels, cyan (cyan) pixels, and yellow (yellow) pixels are arranged.
Each of the sub-pixels included in the sub-pixel region SPA may be formed with a light emitting layer of a corresponding color. For example, a light emitting layer including at least one of an organic light emitting (organic light emitting) substance and an inorganic light emitting substance such as a quantum dot (quantum dot) substance may be formed in each of the sub-pixels. In a display device, such subpixels may be arranged in a plurality in a row and column direction.
Each of the sub-pixel regions SPA may have a rectangular shape. However, this is merely exemplary, and the shape of the sub-pixel region SPA is not limited thereto. For example, the subpixel regions SPA may have a diamond shape or a square shape.
The sub-pixel region SPA may include a region in which sub-pixels are arranged in a matrix of n×m (n, m are integers of 1 or more). However, this is merely exemplary, and the arrangement form of the sub-pixels is not limited thereto. For example, the subpixels may be in a stripe (stripe) or PENTILE form in addition to the matrix form ○R Morphology, etc.
In an embodiment, the light emitting layer disposed within the sub-pixel region SPA may be formed by the print head 200. For example, a light emitting layer may be formed in each of the sub-pixel regions SPA by ink ejected from the nozzles 220 included in the printhead 200. For this purpose, the ink may include particles (or ink composition) for forming the light-emitting layer. For example, the ink may include at least one of an organic light-emitting substance and a quantum dot substance, and may further include a material containing a metal oxide (e.g., titanium oxide (TiO) 2 ) Etc.) or organic material.
The print head 200 can eject ink onto the substrate 300 disposed on the stage 100.
In an embodiment, the printhead 200 may include a chamber 210, a nozzle 220, an inflow ILT, and an outflow OLT.
The inflow port ILT may be arranged at one side of the print head 200, and the outflow port OLT may be arranged at the other side of the print head 200. Ink may be injected into the chamber 210 of the printhead 200 through the inflow port ILT and may flow out through the outflow port OLT. For example, ink stored in the reservoir 400 may be provided into the chamber 210 of the printhead 200 through the inflow port ILT via the first conduit P1 (e.g., ink is injected into an interior void space of the chamber 210). Ink droplets may be generated from ink supplied into the chamber 210, and ink droplets selected from the generated ink droplets may be ejected onto the substrate 300 through the nozzles 220. In addition, the non-ejected ink (or non-ejected ink droplets) may be recovered into the reservoir 400 through the second pipe P2 by the outflow port OLT so that the ink may be recycled.
On the other hand, in fig. 1 and 2, the inflow port ILT and the outflow port OLT are illustrated as being independent of the constitution of the chamber 210, but this is for convenience of explanation, and embodiments of the present utility model are not limited thereto. For example, holes (holes) may be formed at one side and the other side of the chamber 210 of the printhead 200, respectively, and the ink stored in the reservoir 400 may be provided into the chamber 210 through the holes formed at one side of the chamber 210 via the first pipe P1. In addition, the ink that is not ejected through the nozzle 220 may be recovered into the reservoir 400 through the second pipe P2 through the hole formed at the other side of the chamber 210.
The chamber 210 may store ink supplied from the inflow port ILT. To this end, the chamber 210 may include an internal empty space for storing ink.
In an embodiment, the chamber 210 may include a filter member disposed in the interior void space. At least a portion of the ink stored in the inner empty space of the chamber 210 may be provided to the nozzle 220 via the filter member. Since the chamber 210 includes a filter member, filtered ink of bubbles, foreign substances, and the like may be supplied to the nozzle 220.
The nozzle 220 may be disposed at (or coupled to) a lower portion of the chamber 210, and receive ink from the chamber 210 and eject ink of a desired size. For example, the nozzle 220 may include at least one hole corresponding to the size of the ejected ink, and the ink (or ink droplet) may be ejected onto the substrate 300 through the at least one hole.
On the other hand, as described above, a part of the ink injected into the chamber 210 through the inflow port ILT of the printhead 200 may be ejected onto the substrate 300 through the nozzles 220, and the non-ejected ink may be recovered from the chamber 210 into the reservoir 400 through the outflow port OLT of the printhead 200, so that the ink may be recycled. During such recirculation of ink, the ink may form a flow path in the internal empty space of the chamber 210 from the inflow port ILT to the outflow port OLT. For example, in the process of flowing out the ink injected into the inflow port ILT to the outflow port OLT, a flow path is formed from the first region A1 in the internal empty space of the chamber 210 toward the second region A2 via the third region A3 as the intermediate region. In this case, depending on the shape of the chamber 210, a phenomenon in which the particle concentration of the ink in each region within the chamber 210 becomes uneven may occur due to a change in the flow rate of the ink flowing in the flow path, a change in the flow path caused by a filter member included in the chamber 210, or the like.
For example, referring also to fig. 3a, fig. 3a shows a print head 200_c according to a comparative example of the utility model.
The printhead 200_c according to the comparative example may include a chamber 210_c, a nozzle 220_c, an inflow port ilt_c, and an outflow port olt_c. The chamber 210_c according to the comparative example may include chamber parts 211_c, 212_c and a filter part 213_c.
The chamber 210_c according to the comparative example may include corners having an angled shape of a right angle form when viewed on one side (e.g., a plane defined by a first direction axis corresponding to the first direction DR1 and a second direction axis corresponding to the second direction DR 2). For example, when viewed on one side, the lower side corner of the chamber 210_c according to the comparative example may have an angled shape of a right angle form.
Here, on a flow path in which the ink injected through the inflow port ilt_c flows into the first region A1 and flows out from the second region A2 to the outflow port olt_c, the flow rate of the ink may decrease due to the right-angle corner of the chamber 210_c, so that particles included in the ink may be retained at the right-angle corner portion of the chamber 210_c.
For example, in the course of the ink injected through the inflow port ilt_c flowing on the first path pth1 of the first area A1, the flow velocity of the ink may drastically decrease on the flow path corresponding to the right-angled corner portion of the chamber 210_c. For example, the ink flowing along the first path pth1 may be subjected to resistance caused by the lower end portion in the right-angle corner portion of the chamber 210_c (for example, the lower long side of the chamber 210_c parallel to the second direction DR 2), so that the flow rate of the ink may drastically decrease. Therefore, particles included in the ink may remain in the first region A1, so that the concentration of particles in the first region A1 may increase.
Similarly, in the process of the ink flowing out to the outflow port olt_c through the third path pth3 of the second area A2, the flow velocity of the ink may drastically decrease in the flow path corresponding to the right-angle corner portion of the chamber 210_c. For example, the ink flowing along the third path pth3 may be subjected to resistance caused by a side face portion in the right-angle corner portion of the chamber 210_c (for example, the right-side short side of the chamber 210_c parallel to the first direction DR 1), so that the flow rate of the ink may drastically decrease. Therefore, particles included in the ink may remain in the third region A3, so that the concentration of particles in the third region A3 may increase.
Further, a part of particles included in the ink is filtered by the filter member 213_c included in the chamber 210_c, so that the particle concentration at the corner portion of the chamber 210_c may be increased.
For example, in the course of the ink injected through the inflow port ilt_c flowing from the second chamber part 212_c (or the inner empty space of the second chamber part 212_c) to the first chamber part 211_c (or the inner empty space of the first chamber part 211_c) via the filter part 213_c, a part of particles included in the ink may be filtered by the filter part 213_c and returned to the first region A1 through the second path pth 2. When this phenomenon is repeated, in the first region A1, the concentration of particles included in the ink may increase.
Similarly, in the process in which ink flows from the first chamber part 211_c (or the internal empty space of the first chamber part 211_c) to the second chamber part 212_c (or the internal empty space of the second chamber part 212_c) via the filter part 213_c, a part of particles included in ink that is not ejected through the nozzle 220_c may be filtered by the filter part 213_c and returned to the second region A2 through the fourth path pth 4. When this phenomenon is repeated, in the second region A2, the concentration of particles included in the ink may increase.
As described above, in the inner empty space of the chamber 210_c according to the comparative example (i.e., the comparative example including the corner having the angled shape of the right angle form), the concentration of the particles in the ink included in the region (e.g., the first region A1 and/or the second region A2) corresponding to the corner side of the chamber 210_c may be higher than the concentration of the particles in the ink included in the region (e.g., the third region A3) corresponding to the center side. In this case, the particle concentration of the ink ejected from the chamber 210_c through the nozzle 220_c may be different depending on the relative position.
For example, referring also to fig. 3b, as shown in the comparative graph shown in fig. 3b, the particle concentration of the ink ejected from the nozzle 220_c at the position corresponding to the first region A1 and the second region A2 may be higher than the particle concentration of the ink ejected from the nozzle 220_c at the position corresponding to the third region A3.
As described in the comparative example with reference to fig. 3a and 3b, when the ink ejected from the nozzle 220_c has different particle concentrations according to the relative positions (i.e., when the particle concentrations are not uniform), the reliability of the light emitting layer or the like formed by the ink ejected from the nozzle 220_c may be degraded. For example, when the concentration of particles in the light emitting layer disposed within the sub-pixel region SPA is different depending on the position, a problem may occur in that a patch or the like is recognized at the time of light emission.
The chamber 210 (or the printhead 200) according to an embodiment of the present utility model may include at least one corner CS1, CS2 having a rounded shape (or curved shape) when viewed on one side (e.g., a plane defined by a first direction axis corresponding to the first direction DR1 and a second direction axis corresponding to the second direction DR 2). For example, the lower side corners of the chamber 210 may have a rounded shape when viewed on the one side. In this case, since the flow rate of the ink flowing in the chamber 210 is not reduced and the ink flows along the rounded corner portions in the region corresponding to the lower corner portion of the chamber 210 having the rounded shape, the particles (or the ink composition) are not retained at the corner portions of the chamber 210 but move and circulate along the flow path of the ink together with the ink. Accordingly, uniformity of particle concentration of the ink in the chamber 210 in each region can be improved. In this regard, a more specific description will be made with reference to fig. 4a to 6 b.
Fig. 4a is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2. Fig. 4b is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 4a through a nozzle.
Meanwhile, a shape of the print head 200 is shown in fig. 4a as viewed on one side (e.g., a plane defined by a first direction axis corresponding to the first direction DR1 and a second direction axis corresponding to the second direction DR 2). Hereinafter, a specific configuration of the print head 200 according to the embodiment of the present utility model will be specifically described with reference to the shape as viewed on the one side described above, unless otherwise specified.
Meanwhile, a first graph showing particle concentration according to the relative position in the second direction DR2 for ink ejected through the nozzle 220 of the printhead 200 according to an embodiment of fig. 4a is shown in fig. 4 b.
Referring to fig. 4a, a printhead 200 according to an embodiment of the present utility model may include a chamber 210, a nozzle 220, an inflow ILT, and an outflow OLT.
In an embodiment, the chamber 210 may include a first chamber component 211, a second chamber component 212, and a filter component 213.
The first chamber component 211 and the second chamber component 212 may function as a frame for the chamber 210 (or the printhead 200). For example, each of the first chamber part 211 and the second chamber part 212 may include an internal empty space for supplying ink.
On the other hand, for convenience of explanation, the first chamber part 211 and the second chamber part 212 are illustrated in fig. 4a as being independent from each other, but embodiments of the present utility model are not limited thereto. For example, the first chamber component 211 and the second chamber component 212 may be integrally formed, thereby forming a frame of the chamber 210.
The filter member 213 may be arranged between the first chamber member 211 and the second chamber member 212.
The filter member 213 may filter bubbles, impurities, and the like included in the ink injected through the inflow port ILT and flowing toward the nozzle 220. For example, the ink injected into the inner empty space of the second chamber member 212 through the inflow port ILT may flow into the inner empty space of the first chamber member 211 via the filter member 213 while bubbles, impurities, and the like in the ink are filtered. Accordingly, when ink droplets are generated from the ink supplied into the first chamber part 211 and ejected onto a substrate (e.g., the substrate 300 of fig. 1) through the nozzle 220, the ink droplets from which bubbles, impurities, and the like are removed may be ejected onto the substrate (e.g., the substrate 300 of fig. 1). Therefore, the reliability of the light emitting layer or the like formed by the ink ejected from the nozzles 220 can be improved.
On the other hand, the filter member 213 may include a known filter material for filtering bubbles, impurities, and the like and transmitting particles (or ink composition) (for example, organic light-emitting substances, quantum dot substances, and the like) of a solution for forming ink, a light-emitting layer, and the like.
In an embodiment, the first chamber component 211 may include a first side SI1, a second side SI2, a third side SI3, and a fourth side SI4. For example, the shape defining the interior void space of the first chamber component 211 may include first and third sides SI1, SI3 parallel to the first direction DR1 and second and fourth sides SI2, SI4 parallel to the second direction DR2 (e.g., the second and fourth sides SI2, SI4 are perpendicular to the first and third sides SI1, SI 3). As an example, the first side SI1 may correspond to a left side short side of the first chamber part 211, the third side SI3 may correspond to a right side short side of the first chamber part 211, the second side SI2 may correspond to a lower side long side of the first chamber part 211, and the fourth side SI4 may correspond to an upper side long side of the first chamber part 211.
In an embodiment, the first chamber component 211 may include a first corner CS1 that meets the first side SI1 and the second side SI2 and has a rounded shape. Further, in an embodiment, the first chamber component 211 may include a second corner CS2 that meets the second and third sides SI2, SI3 and has a rounded shape. For example, the lower side corners of the first chamber part 211 may have a rounded shape (or curved shape). As an example, the first corner CS1 may correspond to a corner portion disposed at a left lower end of the first chamber part 211, and the second corner CS2 may correspond to a corner portion disposed at a right lower end of the first chamber part 211. For example, the first corner CS1 may be disposed on one side of the first chamber component 211 (or chamber 210), and the second corner CS2 may be disposed on the other side of the first chamber component 211 (or chamber 210).
In this case, in the areas corresponding to the first corner CS1 and the second corner CS2, the flow rate of the ink flowing in the internal empty space of the first chamber part 211 (or the chamber 210) is not reduced, and the ink flows along the first corner CS1 and the second corner CS2 having the rounded shape. Therefore, the particles (or ink composition) included in the ink do not remain in the areas corresponding to the first corner CS1 and the second corner CS2 (e.g., the first area A1 and the second area A2 of fig. 2), but move along the flow path of the flowing ink together with the ink, so that the phenomenon that the particle concentration relatively increases on the first corner CS1 and the second corner CS2 can be prevented. That is, uniformity of concentration of particles included in the ink in the chamber 210 (or the first chamber part 211) can be improved.
For example, referring also to fig. 4b, as shown in the first graph shown in fig. 4b, the particle concentration of ink ejected from the nozzle 220 at a position corresponding to the first region A1 and the second region A2 (e.g., regions corresponding to the first corner CS1 and the second corner CS 2) of the first chamber member 211 may be substantially similar to the particle concentration of ink ejected from the nozzle 220 at a position corresponding to the third region A3 (e.g., region corresponding to the central region of the first chamber member 211). That is, the phenomenon that the ink ejected from the nozzles 220_c of the print head 200_c according to the comparative example described with reference to fig. 3a and 3b has different particle concentrations according to the relative positions can be improved.
Fig. 5a is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2. Fig. 5b is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2. Fig. 5c is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 5a through a nozzle.
Meanwhile, the shapes of the printheads 200_1, 200_2 as viewed on one side (e.g., a plane defined by a first direction axis corresponding to the first direction DR1 and a second direction axis corresponding to the second direction DR 2) are shown in fig. 5a and 5 b. Hereinafter, specific configurations of the print heads 200_1, 200_2 according to the embodiment of the present utility model will be described with reference to the shape as viewed on the one side described above, unless otherwise specified.
Meanwhile, a second graph showing the particle concentration according to the relative position in the second direction DR2 for the ink ejected through the nozzle 220 of the print head 200_1 according to an embodiment of fig. 5a is shown in fig. 5 c.
Fig. 5a and 5b show a variant embodiment with respect to the embodiment of fig. 4a in relation to the shape of the second chamber part 212_1, 212_2.
Referring to fig. 5a, a printhead 200_1 according to an embodiment of the present utility model includes a chamber 210_1, a nozzle 220, an inflow port ILT, and an outflow port OLT.
In an embodiment, the chamber 210_1 may include a first chamber part 211, a second chamber part 212_1, and a filter part 213.
In an embodiment, the second chamber component 212_1 may include a fifth side SI5, a sixth side SI6, a seventh side SI7, and an eighth side SI8. For example, the outline defining the interior void space of the second chamber component 212_1 may include a fifth side SI5 and a seventh side SI7 parallel to the first direction DR1 and a sixth side SI6 and an eighth side SI8 parallel to the second direction DR2 (e.g., the sixth side SI6 and the eighth side SI8 are perpendicular to the fifth side SI5 and the seventh side SI 7). As an example, the fifth side SI5 may correspond to a left side short side of the second chamber part 212_1, the seventh side SI7 may correspond to a right side short side of the second chamber part 212_1, the sixth side SI6 may correspond to a lower side long side of the second chamber part 212_1, and the eighth side SI8 may correspond to an upper side long side of the second chamber part 212_1.
In an embodiment, the second chamber component 212_1 may include a third corner CS3 that interfaces with the fifth and sixth sides SI5, SI6 and extends in an oblique direction relative to the fifth and sixth sides SI5, SI 6. Further, in an embodiment, the second chamber component 212_1 may include a fourth corner CS4 that interfaces with the sixth side SI6 and the seventh side SI7 and extends in an oblique direction relative to the sixth side SI6 and the seventh side SI 7. For example, the third corner CS3 and the fourth corner CS4 may extend in an oblique direction with respect to the first direction DR1 and the second direction DR 2. As an example, the third corner CS3 may correspond to a corner portion disposed at the left lower end of the second chamber part 212_1, and the fourth corner CS4 may correspond to a corner portion disposed at the right lower end of the second chamber part 212_1. For example, the third corner CS3 may be disposed on one side of the second chamber component 212_1 (or the chamber 210_1), and the fourth corner CS4 may be disposed on the other side of the second chamber component 212_1 (or the chamber 210_1).
As described above, not only the first chamber member 211 but also the second chamber member 212_1 includes the third corner CS3 and the fourth corner CS4 extending in the oblique direction, so that uniformity of the concentration of particles included in the ink in the chamber 210_1 can be further improved.
For example, referring also to fig. 5c, as shown in the second graph shown in fig. 5c, the particle concentration of the ink ejected from the nozzle 220 at the positions corresponding to the first region A1 and the second region A2 corresponding to the lower side corner portion of the chamber 210_1 may be substantially similar to the particle concentration of the ink ejected from the nozzle 220 at the position corresponding to the third region A3 corresponding to the central portion of the chamber 210_1. That is, the phenomenon that the ink ejected from the nozzles 220_c of the print head 200_c according to the comparative example described with reference to fig. 3a and 3b has different particle concentrations according to the relative positions can be improved.
On the other hand, the shapes of the third corner CS3 and the fourth corner CS4 included in the second chamber part 212_1 are not limited thereto. For example, referring also to fig. 5b, the printhead 200_2 may include a chamber 210_2, a nozzle 220, an inflow ILT, and an outflow OLT, and the chamber 210_2 may include a first chamber component 211, a second chamber component 212_2, and a filter component 213. In an embodiment, substantially similar to the first and second corners CS1, CS2 of the first chamber component 211, the third corner CS3_1 of the second chamber component 212_2 may meet the fifth and sixth sides SI5, SI6 and also have a rounded shape, and the fourth corner CS4_1 of the second chamber component 212_2 may meet the sixth and seventh sides SI6, SI7 and also have a rounded shape.
Fig. 6a is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 2. Fig. 6b is a graph showing particle concentration according to relative position of ink ejected from the print head of fig. 6a through a nozzle.
Meanwhile, a shape of the print head 200_3 viewed on one side (e.g., a plane defined by a first direction axis corresponding to the first direction DR1 and a second direction axis corresponding to the second direction DR 2) is shown in fig. 6 a. Hereinafter, a specific configuration of the print head 200_3 according to an embodiment of the present utility model will be described with reference to a shape as viewed on the above-described one side surface unless otherwise specified.
Meanwhile, a third graph showing the particle concentration according to the relative position in the second direction DR2 for the ink ejected through the nozzle 220 of the print head 200_3 according to an embodiment of fig. 6a is shown in fig. 6 b.
Fig. 6a shows a variant embodiment with respect to the embodiment of fig. 4a in relation to the shape of the second chamber part 212_3.
Referring to fig. 6a, a printhead 200_3 according to an embodiment of the present utility model may include a chamber 210_3, a nozzle 220, an inflow port ILT, and an outflow port OLT.
In an embodiment, the chamber 210_3 may include a first chamber part 211, a second chamber part 212_3, and a filter part 213.
In an embodiment, the width of the interior void space of the second chamber component 212_3 (or the interior void space of the chamber 210_3) (e.g., the width in the first direction DR 1) may increase from the side portion toward the central portion. For example, the interval (e.g., the first interval d 1) of the central portion (e.g., the portion corresponding to the third region A3 of fig. 2) of the second chamber part 212_3 in the first direction DR1 may be greater than the interval (e.g., the second interval d 2) of the side portions (e.g., the portions corresponding to the first region A1 and the second region A2 of fig. 2) in the first direction DR1.
As described above, since the width of the inner empty space of the chamber 210_3 increases toward the central portion, the flow space of ink corresponding to the central portion in the inner empty space of the chamber 210_3 (i.e., the flow space of ink) can be formed larger. Therefore, the uniformity of the concentration of particles included in the ink in the chamber 210_3 can be further improved.
For example, referring also to fig. 6b, as shown in the third graph shown in fig. 6b, the particle concentration of the ink ejected from the nozzle 220 at the positions corresponding to the first region A1 and the second region A2 corresponding to the lower side corner portion of the chamber 210_3 may be substantially similar to the particle concentration of the ink ejected from the nozzle 220 at the position corresponding to the third region A3 corresponding to the central portion of the chamber 210_3. That is, the phenomenon that the particle concentration is relatively low in the third region A3 corresponding to the central portion of the chamber 210_3 may be further improved.
Fig. 7 is a diagram for explaining an inkjet printing apparatus according to an embodiment of the present utility model. Fig. 8 is a diagram showing an example of a print head included in the inkjet printing apparatus of fig. 7.
Fig. 7 and 8 show a variant embodiment with respect to the embodiment of fig. 2 and 4a in relation to the shape of the chamber 210_4 (or the first chamber part 211_1).
Referring to fig. 7 and 8, the inkjet printing apparatus 10_1 may include a stage 100 and a printhead 200_4 that ejects ink onto a substrate 300. According to an embodiment, the inkjet printing device 10_1 may also include a reservoir 400.
In an embodiment, the printhead 200_4 may include a chamber 210_4, a nozzle 220, an inflow port ILT, and an outflow port OLT. In addition, the chamber 210_4 may include a first chamber part 211_1, a second chamber part 212, and a filter part 213.
In an embodiment, the chamber 210_4 (or the print head 200_4) may include at least one corner cs1_1, cs2_1 extending in an oblique direction with respect to the first direction DR1 and the second direction DR2 when viewed on one side (e.g., a plane defined by a first direction axis corresponding to the first direction DR1 and a second direction axis corresponding to the second direction DR 2).
For example, as shown in fig. 8, the first chamber part 211_1 included in the chamber 210_4 may include a first corner cs1_1 that meets the first and second sides SI1 and SI2 and extends in an oblique direction with respect to the first and second sides SI1 and SI 2. Further, in an embodiment, the first chamber part 211_1 may include a second corner cs2_1 that meets the second and third sides SI2 and SI3 and extends in an oblique direction with respect to the second and third sides SI2 and SI 3. For example, the first corner cs1_1 and the second corner cs2_1 may extend in an oblique direction with respect to the first direction DR1 and the second direction DR 2. As an example, the first corner cs1_1 may correspond to a corner portion disposed at a left lower end of the first chamber part 211_1, and the second corner cs2_1 may correspond to a corner portion disposed at a right lower end of the first chamber part 211_1.
On the other hand, in the embodiment of fig. 7 and 8, as described with reference to fig. 5a and 5b, the lower side corner portion of the second chamber part 212 may also have a shape extending in an oblique direction or a rounded shape. For example, the second chamber component 212 shown in fig. 8 may include the third corner CS3 and the fourth corner CS4 described with reference to fig. 5a, or may include the third corner cs3_1 and the fourth corner cs4_1 described with reference to fig. 5 b. In this regard, the features overlapping with those described with reference to fig. 5a and 5b will not be repeated.
Furthermore, in the embodiment of fig. 7 and 8, as described with reference to fig. 6a, the width of the second chamber component 212 (e.g., the width in the first direction DR 1) may also increase from the side portion toward the central portion. In this regard, the features overlapping with those described with reference to fig. 6a will not be described again.
While the present utility model has been described with reference to the embodiments thereof, those skilled in the art will appreciate that various modifications and changes can be made to the present utility model without departing from the spirit and scope of the present utility model as set forth in the appended claims.

Claims (10)

1. An inkjet printing apparatus, comprising:
an objective table; and
a print head located at an upper portion of the stage and including a chamber and a nozzle for ejecting ink from the chamber,
wherein the chamber, when viewed on one side, comprises: a first side, a second side, a third side, and a fourth side; a first corner contiguous with the first and second sides and having a rounded shape; and a second corner contiguous with the second side and the third side and having a rounded shape.
2. The inkjet printing apparatus of claim 1 wherein the chamber comprises:
a first chamber component comprising the first, second, third and fourth sides, the first corner, and the second corner;
a second chamber component comprising a fifth side, a sixth side, a seventh side, and an eighth side; and
a filter member disposed between the first chamber member and the second chamber member.
3. The inkjet printing apparatus of claim 2 wherein the second chamber part further comprises, when viewed on the one side: a third corner that meets the fifth side and the sixth side and extends in an oblique direction with respect to the fifth side and the sixth side; and a fourth corner that meets the sixth side and the seventh side and extends in an oblique direction with respect to the sixth side and the seventh side.
4. The inkjet printing apparatus of claim 2 wherein the second chamber part further comprises, when viewed on the one side: a third corner contiguous with the fifth and sixth sides and having a rounded shape; and a fourth corner, contiguous with the sixth and seventh sides and having a rounded shape.
5. Inkjet printing apparatus according to claim 2 wherein the width of the second chamber member in one direction increases from the side portion toward the central portion.
6. An inkjet printing apparatus, comprising:
an objective table; and
a print head located at an upper portion of the stage and including a chamber and a nozzle for ejecting ink from the chamber,
wherein the chamber, when viewed on one side, comprises: a first side, a second side, a third side, and a fourth side; a first corner contiguous with the first and second sides and extending in an oblique direction relative to the first and second sides; and a second corner that meets the second side and the third side and extends in an oblique direction with respect to the second side and the third side.
7. The inkjet printing apparatus of claim 6 wherein the chamber comprises:
a first chamber component comprising the first, second, third and fourth sides, the first corner, and the second corner;
a second chamber component comprising a fifth side, a sixth side, a seventh side, and an eighth side; and
a filter member disposed between the first chamber member and the second chamber member.
8. The inkjet printing apparatus of claim 7 wherein said second chamber member further comprises, when viewed on said one side: a third corner that meets the fifth side and the sixth side and extends in an oblique direction with respect to the fifth side and the sixth side; a fourth corner that meets the sixth side and the seventh side and extends in an oblique direction with respect to the sixth side and the seventh side.
9. The inkjet printing apparatus of claim 7 wherein said second chamber member further comprises, when viewed on said one side: a third corner contiguous with the fifth and sixth sides and having a rounded shape; and a fourth corner, contiguous with the sixth and seventh sides and having a rounded shape.
10. The inkjet printing apparatus of claim 7 wherein the width of the second chamber member in one direction increases from the side portion toward the central portion.
CN202320637565.5U 2022-03-31 2023-03-28 Ink jet printing apparatus Active CN219650845U (en)

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KR10-2022-0040694 2022-03-31
KR1020220040694A KR20230142075A (en) 2022-03-31 2022-03-31 Inkjet print apparatus

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CN219650845U true CN219650845U (en) 2023-09-08

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