CN114536973B - Ink jet printing device - Google Patents
Ink jet printing device Download PDFInfo
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- CN114536973B CN114536973B CN202210120321.XA CN202210120321A CN114536973B CN 114536973 B CN114536973 B CN 114536973B CN 202210120321 A CN202210120321 A CN 202210120321A CN 114536973 B CN114536973 B CN 114536973B
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- printing
- nozzles
- light
- inkjet printing
- liquid drop
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- 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
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- 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
- B41J2/07—Ink jet characterised by jet control
- B41J2/11—Ink jet characterised by jet control for ink spray
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- 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
- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
Abstract
The present invention provides an inkjet printing apparatus including: a plurality of printing nozzles for performing inkjet printing on the display panel; the liquid drop monitoring members are arranged in one-to-one correspondence with the printing nozzles and are used for monitoring the positions of liquid drops sprayed by the printing nozzles; a controller for controlling the printing nozzles to perform inkjet printing; when the liquid drop monitoring component monitors that the liquid drops ejected by the corresponding printing nozzles deviate from a threshold angle, the controller closes the printing nozzles and calls the other printing nozzles with the same ink ejection volume to carry out bit-complement printing. According to the invention, the liquid drop is monitored by adopting the liquid drop monitoring component, and when the corresponding liquid drop is monitored to deviate from the threshold angle, the controller is adopted to call the other printing nozzle with the same ink jet volume to perform the bit-supplementing printing, so that the problem of color mixing phenomenon between adjacent pixel printing areas caused by the deviation of the liquid drop is avoided, and the yield and the reliability of the display panel are improved.
Description
Technical Field
The present application relates to the field of displays, and more particularly, to an inkjet printing apparatus.
Background
The ink jet printing technology (IJP) is one of the most promising technologies for realizing flexible, large-sized Active-matrix organic light emitting diode (AMOLED) panels.
The ink jet printer usually completes the ink jet printing action by a plurality of nozzles together, before ink jet printing, the volume, speed and angle of ink drops ejected by each nozzle are monitored by a laser ink observing system, and before printing is executed, the nozzles with the volume, speed or angle exceeding a threshold value are disabled, so that the yield of the printed panel is ensured.
However, if the ejection state of some printing nozzles is unstable, the system does not recognize the abnormal ejection state of the nozzles when the laser ink viewing system monitors, and when the formal printing is performed, the angle of the ink droplets ejected by the nozzles with unstable ejection state is greatly deviated, the ejected ink droplets are caused to fall into the sub-pixels adjacent to the target pixel, so that uneven printing (mura) or color mixing is caused, and the product yield of the display panel is reduced.
Disclosure of Invention
The invention provides an ink-jet printing device, which is used for improving the problem that color mixing phenomenon occurs between adjacent pixel printing areas due to ink drop deviation when the ink-jet printing is used for preparing a display panel, and improving the yield and the reliability of the display panel.
In order to solve the problems, the technical scheme provided by the invention is as follows:
the present invention provides an inkjet printing apparatus including:
a plurality of printing nozzles for performing inkjet printing on the display panel;
the liquid drop monitoring members are arranged in one-to-one correspondence with the printing nozzles and are used for monitoring the positions of liquid drops sprayed by the printing nozzles;
a controller for controlling the printing nozzles to perform inkjet printing;
when the liquid drop monitoring component monitors that the liquid drops ejected by the corresponding printing nozzles deviate from a threshold angle, the controller closes the printing nozzles and calls the other printing nozzles with the same ink ejection volume to carry out bit-complement printing.
Alternatively, in some embodiments of the invention, the droplet monitoring means is a laser monitoring means.
Optionally, in some embodiments of the present invention, the laser monitoring member includes a laser emitting unit and a light guiding unit, and the light guiding unit is configured to emit a laser beam emitted by the laser emitting unit out of the laser monitoring member at the threshold angle.
Optionally, in some embodiments of the present invention, the light guiding unit is a ring structure, and the light guiding unit is disposed around the printing nozzle.
Optionally, in some embodiments of the present invention, the light guiding unit includes a light guiding inner housing and a light guiding outer housing, which together enclose a light propagation space of the light guiding unit.
Optionally, in some embodiments of the present invention, a side of the light guiding inner shell facing the light guiding outer shell is provided with a first reflective layer, and a side of the light guiding outer shell facing the light guiding inner shell is provided with a second reflective layer.
Optionally, in some embodiments of the invention, the light propagation space is a hollow space.
Alternatively, in some embodiments of the invention, the light propagation space is filled with polycarbonate or polymethyl methacrylate.
Optionally, in some embodiments of the invention, the light guiding inner housing is a nozzle outer housing of the printing nozzle.
Alternatively, in some embodiments of the invention, the light guiding outer shell and the light guiding inner shell are of the same material.
The invention provides an ink jet printing device, which is characterized in that a liquid drop monitoring component is additionally arranged in the ink jet printing device, liquid drops sprayed by printing nozzles are monitored by the liquid drop monitoring component, when the liquid drops sprayed by the corresponding printing nozzles deviate from a threshold angle, the printing nozzles are closed by a controller, and the other printing nozzles with the same ink jet volume are called for position compensation printing. The problem that color mixing phenomenon occurs between adjacent pixel printing areas due to ink drop deviation when the display panel is prepared by ink jet printing is avoided, and the yield and reliability of the display panel are improved.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a first structure of an inkjet printing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of an inkjet printing apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of an inkjet printing apparatus according to an embodiment of the present invention;
fig. 4 is a schematic printing diagram of an inkjet printing apparatus according to an embodiment of the present invention.
Detailed Description
The following description of the present embodiments and/or examples will be provided for clarity and completeness of the description of the present embodiments and/or examples, and it is apparent that the embodiments and/or examples described below are merely some, but not all, embodiments and/or examples of the present invention. All other embodiments and/or examples, which a person of ordinary skill in the art would achieve without undue burden, are within the scope of the invention based on embodiments and/or examples in the present invention.
The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ left ], [ right ], [ front ], [ rear ], [ inner ], [ outer ], [ side ], etc., are only referring to the directions of the attached drawings. Accordingly, directional terminology is used to describe and understand the invention and is not intended to be limiting. The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature.
Aiming at the problem that color mixing phenomenon occurs between adjacent pixel printing areas of a display panel due to ink drop deviation in the existing ink jet printing process, the invention provides a novel ink jet printing device which solves the problem.
In one embodiment, referring to fig. 1 to 4, fig. 1 is a schematic diagram illustrating a first structure of an inkjet printing apparatus according to an embodiment of the present invention; fig. 2 is a schematic diagram of a second structure of an inkjet printing apparatus according to an embodiment of the present invention, and in particular, a first schematic diagram of a bottom view of the inkjet printing apparatus according to the embodiment of the present invention; fig. 3 is a schematic diagram of a third structure of an inkjet printing apparatus according to an embodiment of the present invention, and in particular, a second schematic diagram of a bottom view of the inkjet printing apparatus according to the embodiment of the present invention; fig. 4 shows a schematic printing diagram of an inkjet printing apparatus according to an embodiment of the present invention. As shown in fig. 1 to 4, an inkjet printing apparatus 10 provided in an embodiment of the present invention includes:
a plurality of printing nozzles 11 for performing inkjet printing on the display panel 20;
a droplet monitoring member 12, disposed in one-to-one correspondence with the printing nozzles 11, for monitoring positions of droplets 111 ejected from the printing nozzles 11;
a controller (not shown) for controlling the printing nozzles 11 to perform inkjet printing;
when the droplet monitoring member 12 monitors that the droplet 111 ejected from the corresponding printing nozzle 11 deviates from the threshold angle, the controller closes the printing nozzle 11 and calls the other printing nozzle 11 with the same ink ejection volume to perform the bit-by-bit printing.
According to the embodiment of the invention, the liquid drop monitoring component is additionally arranged in the ink-jet printing device, the liquid drop monitoring component is used for monitoring liquid drops sprayed by the printing nozzles, when the liquid drops sprayed by the corresponding printing nozzles deviate from a threshold angle, the printing nozzles are closed by the controller, and the other printing nozzles with the same ink-jet volume are called for bit-filling printing. The problem that color mixing phenomenon occurs between adjacent pixel printing areas due to ink drop deviation when the display panel is prepared by ink jet printing is avoided, and the yield and reliability of the display panel are improved.
Specifically, referring to fig. 1 to 4, the droplet monitoring member 12 is a laser monitoring member, and mainly uses laser to monitor the positions of the droplets. The laser monitoring member 12 includes a laser emitting unit (not shown) for emitting a laser beam 124, and a light guiding unit for emitting the laser beam 124 emitted from the laser emitting unit out of the laser monitoring member 12 at a threshold angle θ, which is a critical angle for causing deviation of the liquid droplets when color mixing of the display panel occurs. As shown in fig. 4, the threshold angle θ is an included angle between the laser beam 124 and the gravity direction, and a specific value of the threshold angle θ is determined by factors such as a size of the printing nozzle, a size of a pixel to be printed, a distance between the printing nozzle and the pixel, and the like, and may be specifically set according to actual needs, and an outgoing angle of the laser beam 124 may be adjusted by adjusting an outgoing angle of the laser beam 124, so that the outgoing angle of the laser beam 124 meets the threshold angle θ. Specifically, the pixel information to be printed is input into the controller, the controller automatically calculates the threshold angle θ, and controls the laser emitting unit to emit the laser beam 124 at a predetermined angle, and the laser beam 124 is transmitted through the light guiding unit and then emitted to the laser monitoring member at the threshold angle θ.
Referring to fig. 2 and 3, in order to monitor the deviation of the droplets in all directions, the light guiding units are arranged in a ring-shaped structure around the printing nozzles, and the printing nozzles 11 are arranged in a one-to-one correspondence. Specifically, the light guiding unit includes a light guiding outer casing 121 and a light guiding inner casing 122, and the light guiding inner casing 122 and the light guiding outer casing 121 together enclose a light propagation space 123 of the light guiding unit. A first reflective layer is disposed on a side of the light guiding inner housing 122 facing the light guiding outer housing 121, and a second reflective layer is disposed on a side of the light guiding outer housing 121 facing the light guiding inner housing 122. The laser beam 124 propagates in the light propagation space 123 through the reflection effects of the first reflecting layer and the second reflecting layer, and further, the laser beam 124 is totally reflected at the first reflecting layer and the second reflecting layer, so that the attenuation of the laser beam 124 can be reduced, and the monitoring effect of the laser monitoring member 12 is improved.
In one embodiment, the light propagation space 123 is a hollow space, i.e., the laser beam 124 propagates in air as a medium within the light propagation space 123.
In another embodiment, the light propagation space 123 is a solid space filled with a light guiding material such as polycarbonate or polymethyl methacrylate, and the laser beam 124 propagates in the light propagation space 123 with the solid light guiding material as a medium. In this way, the light propagation medium in the light propagation space 123 is relatively stable, and the problem of adversely affecting the propagation of the laser beam 124 due to the entry of impurity particles into the light propagation space 123 is avoided.
In one embodiment, referring to fig. 2, the light guiding unit and the printing nozzle 11 are two independent components, the light guiding inner housing 122 may be connected to the nozzle outer housing of the printing nozzle 11, the light guiding inner housing 122 and the nozzle outer housing may be connected by glue, a connecting component or any other means, and the light guiding inner housing 122 may also be disconnected from the nozzle outer housing. Further, the material of the light guiding outer case 121 is the same as the material of the light guiding inner case 122, and the material of the first reflective layer and the second reflective layer is the same. Further, the material of the light guide inner case 122 is the same as that of the nozzle outer case.
In another embodiment, referring to fig. 3, the light guiding inner case 122 is a nozzle outer case of the printing nozzle 11, that is, the nozzle outer case of the printing nozzle 11 is multiplexed into the light guiding inner case 122 of the light guiding unit, and the side of the nozzle outer case facing the light guiding outer case 121 is provided with the first reflective layer. Further, the material of the light guide housing 121 is the same as that of the nozzle housing, and the material of the first reflective layer and the second reflective layer is the same.
Referring to fig. 4, the display panel 20 to be printed includes an array substrate 21, a first electrode 22, and a pixel defining layer 23. The pixel defining layer 23 is patterned to form a pixel area, where the pixel area includes a red pixel area R, a green pixel area G, and a blue pixel area B, and the pixel area is configured to accommodate a luminescent material of a corresponding color, and the luminescent material is printed into the corresponding pixel area by using the inkjet printing device provided by the embodiment of the present invention.
As shown in fig. 4, in this embodiment, the printing of the green light emitting material to the green pixel area is taken as an example, and the inkjet printing apparatus provided by the present invention will be explained in detail. When the ink jet printing device is used for printing the green luminescent material 24 on the green pixel area G, the printing nozzle 11 ejects the liquid drop 111 containing the green luminescent material, and the liquid drop monitoring component 12 emits the laser beam 124 to monitor the liquid drop 111; when the droplet 111 does not exceed the threshold angle θ, the printing nozzle 11 continues the printing operation on the green pixel area G until the printing of the green luminescent material is completed; when the drop monitoring member 12 monitors that the drop exceeds the threshold angle θ, the drop monitoring member 12 feeds back a monitoring result to the controller, and the controller controls the printing nozzle 11 to close the printing operation and calls another printing nozzle 11 adjacent to the printing nozzle 11 and having the same ink ejection volume to perform the offset printing, that is, calls another printing nozzle 11 adjacent to the printing nozzle 11 to print the green luminescent material to perform the offset printing. In this way, the problem of color mixing between adjacent pixel printing areas due to the large deviation of the liquid drops 111 ejected from the printing nozzles 11 and the dripping in the adjacent sub-pixels of the target pixel is avoided, and the yield and reliability of the display panel 20 are improved.
In summary, in the embodiment of the present invention, by adding the droplet monitoring member in the inkjet printing device, the droplet monitoring member is used to monitor the droplet ejected from the printing nozzle, and when it is monitored that the droplet ejected from the corresponding printing nozzle deviates from the threshold angle, the controller is used to close the printing nozzle, and call another printing nozzle with the same inkjet volume to perform the bit-filling printing. The problem that color mixing phenomenon occurs between adjacent pixel printing areas due to ink drop deviation when the display panel is prepared by ink jet printing is avoided, and the yield and reliability of the display panel are improved.
The foregoing has described in detail the inkjet printing apparatus provided by the embodiments of the present invention, and specific examples have been set forth herein to illustrate the principles and embodiments of the present invention, the above examples being provided only to assist in understanding the methods of the present invention and the core ideas thereof; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.
Claims (7)
1. An inkjet printing apparatus, comprising:
a plurality of printing nozzles for performing inkjet printing on the display panel;
the liquid drop monitoring members are arranged in one-to-one correspondence with the printing nozzles and are used for monitoring the positions of liquid drops sprayed by the printing nozzles;
a controller for controlling the printing nozzles to perform inkjet printing;
when the liquid drop monitoring component monitors that the liquid drops ejected by the corresponding printing nozzles deviate from a threshold angle, the controller closes the printing nozzles and calls the other printing nozzles with the same ink ejection volume to carry out position compensating printing;
wherein the droplet monitoring member is a laser monitoring member; the laser monitoring component comprises a laser emission unit and a light guide unit, wherein the light guide unit is used for emitting laser beams emitted by the laser emission unit out of the laser monitoring component at the threshold angle; the light guide unit is of an annular structure and is arranged around the printing nozzle.
2. The inkjet printing apparatus of claim 1 wherein the light guide unit comprises a light guide inner housing and a light guide outer housing that together enclose a light propagation space of the light guide unit.
3. The inkjet printing apparatus of claim 2 wherein a side of the light guiding inner housing facing the light guiding outer housing is provided with a first reflective layer and a side of the light guiding outer housing facing the light guiding inner housing is provided with a second reflective layer.
4. An inkjet printing apparatus according to claim 3 wherein the light propagation space is a hollow space.
5. An inkjet printing apparatus according to claim 3 wherein the light propagation space is filled with polycarbonate or polymethyl methacrylate.
6. The inkjet printing apparatus of claim 2 wherein the light directing inner housing is a nozzle outer housing of the printing nozzle.
7. The inkjet printing apparatus of claim 2 wherein the light-guiding outer housing and the light-guiding inner housing are of the same material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210120321.XA CN114536973B (en) | 2022-02-07 | 2022-02-07 | Ink jet printing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210120321.XA CN114536973B (en) | 2022-02-07 | 2022-02-07 | Ink jet printing device |
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| Publication Number | Publication Date |
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| CN114536973A CN114536973A (en) | 2022-05-27 |
| CN114536973B true CN114536973B (en) | 2023-06-02 |
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| CN202210120321.XA Active CN114536973B (en) | 2022-02-07 | 2022-02-07 | Ink jet printing device |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282842B (en) * | 2005-10-07 | 2010-09-01 | 皇家飞利浦电子股份有限公司 | Inkjet device and method for the controlled positioning of droplets of a substance onto a substrate |
| KR102190291B1 (en) * | 2017-04-28 | 2020-12-14 | 한국전기연구원 | Ag Ink For 3D Printing And 3D Printing Methods Using The Same |
| CN207901880U (en) * | 2018-02-28 | 2018-09-25 | 森大（深圳）技术有限公司 | Nozzle detecting device and ink-jet printer with nozzle detecting device |
| CN110757957A (en) * | 2018-11-14 | 2020-02-07 | 肇庆皈一智能科技有限公司 | OLED ink-jet printing method and device |
| CN110370802A (en) * | 2019-07-29 | 2019-10-25 | 深圳市华星光电半导体显示技术有限公司 | Ink jet printing device and its adjusting method |
| CN111038114B (en) * | 2019-11-13 | 2021-03-16 | 深圳市华星光电半导体显示技术有限公司 | Ink-jet printing device and method for preparing organic light-emitting diode display panel |
| KR20210089291A (en) * | 2020-01-07 | 2021-07-16 | 삼성디스플레이 주식회사 | Apparatus and method for manufacturing a display device |
| CN113650422B (en) * | 2021-08-02 | 2022-05-10 | 嘉兴学院 | Control method and device for electrohydrodynamic jet printing of wrapped microstructure |
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