WO2021042633A1

WO2021042633A1 - Inkjet printing ink cartridge configured with inner circulation system

Info

Publication number: WO2021042633A1
Application number: PCT/CN2019/127731
Authority: WO
Inventors: 黄志达
Original assignee: 深圳市华星光电半导体显示技术有限公司
Priority date: 2019-09-06
Filing date: 2019-12-24
Publication date: 2021-03-11
Also published as: CN110561915A

Abstract

An inkjet printing ink cartridge (1) configured with an inner circulation system, the cartridge comprising: an inkjet storage container (101), which is used for storing organic light-emitting material ink; a printing nozzle (102); and an inkjet inner circulation unit (110), which connects the inkjet storage container (101) and the printing nozzle (102). The viscosity of the organic light-emitting material ink within the inkjet storage container (101) is adjusted by means of the inkjet inner circulation unit (110), and printing is performed by means of the printing nozzle (102). By means of adjusting the viscosity of polymer ink within the ink cartridge, the described device further improves printing efficiency and reduces the loss of material during pre-printing.

Description

Inkjet print cartridge with internal circulation system

Technical field

The present invention relates to the technical field of printing equipment, and more specifically, to an inkjet printing cartridge provided with an internal circulation system.

Background technique

At present, organic electroluminescent devices (OLEDs) have become the most promising new display devices in recent years due to their self-luminous, all-solid-state, and high-contrast advantages. Among them, ink-jet printing (ink-jet printing) to prepare the corresponding device due to its high material utilization rate has attracted much attention.

In the current printing process, due to the difference between the dynamic viscosity and the static viscosity of the liquid in the ink cartridge, it is necessary to adjust the viscosity of the liquid in the ink cartridge through pre-printing in the early stage of each printing to meet the printing requirements. If the frequency of pre-printing can be reduced, or the pre-printing operation can be directly avoided in some way, it is expected to further improve the utilization of materials and printing efficiency in the inkjet printing process. The main purpose of performing the pre-printing process is to adjust the physical characteristics of the ink to satisfy stable printing.

technical problem

In view of the above-mentioned shortcomings in the prior art, the present invention adjusts the viscosity characteristics of the ink in the ink cartridge by increasing the internal circulation system of the ink cartridge, and circulates the preparation work before printing inside the printing system, thereby further improving the preparation of organic electroluminescence for inkjet printing. The utilization rate of organic light-emitting materials and inkjet printing efficiency in the whole process of display (OLED).

Technical solutions

The purpose of the present invention and the solution of its technical problems are achieved by adopting the following technical solutions. An inkjet print cartridge provided with an internal circulation system according to the present invention includes: an inkjet storage container for storing organic luminescent material ink; a printing nozzle; and an inkjet internal circulation unit connected to the inkjet The storage container and the printing nozzle adjust the viscosity of the organic luminescent material ink in the inkjet storage container through the inkjet internal circulation unit, and then perform printing by the printing nozzle.

The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

In an embodiment of the present invention, the above-mentioned inkjet storage container is an organic luminescent material storage container.

In an embodiment of the present invention, the above-mentioned ink jet internal circulation unit realizes the internal circulation of the organic luminescent material ink through a transfer pump.

In an embodiment of the present invention, the above-mentioned transfer pump is a liquid transfer pump, and the liquid transfer pump controls the speed of the impeller to adjust the viscosity of the ink jet.

In an embodiment of the present invention, the inkjet internal circulation unit described above realizes the internal circulation of the organic luminescent material ink through a pressure difference.

In an embodiment of the present invention, the faster the rotation speed of the impeller, the lower the ink jet viscosity.

In an embodiment of the present invention, the ink jet internal circulation unit is further provided with a temperature control unit to control the temperature change caused by the rotation of the impeller.

In an embodiment of the present invention, the ink jet internal circulation unit is further provided with a first pressure source and a second pressure source.

In an embodiment of the present invention, the pressure value of the second pressure source is greater than that of the first pressure source.

In an embodiment of the present invention, the inkjet internal circulation unit described above realizes the internal circulation of the organic light-emitting material ink through the pressure difference between the first pressure source and the second pressure source.

Beneficial effect

In the present invention, the technical points of the inkjet print cartridge with the internal circulation system are:

1. Further improve the printing efficiency by adjusting the viscosity characteristics of the polymer ink in the ink cartridge;

2. Reduce the material loss during pre-printing by adjusting the viscosity characteristics of the polymer ink in the ink cartridge.

Description of the drawings

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

Fig. 1 shows a system architecture of an inkjet print cartridge provided with an internal circulation system according to an embodiment of the present invention.

Fig. 2 shows a schematic diagram of a first embodiment according to the present invention.

Fig. 3 shows a schematic diagram of a second embodiment according to the present invention.

Embodiments of the present invention

The description of the following embodiments refers to the attached drawings to illustrate specific embodiments that the present invention can be implemented. The directional terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", "inner", "outer", "side", etc., are for reference only The direction of the additional schema. Therefore, the directional terms used are used to describe and understand the present invention, rather than to limit the present invention.

The drawings and descriptions are to be regarded as illustrative in nature and not restrictive. In the figure, units with similar structures are indicated by the same reference numerals. In addition, for understanding and ease of description, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present invention is not limited thereto.

In addition, in the specification, unless expressly described to the contrary, the word "comprising" will be understood as meaning including the components, but does not exclude any other components. In addition, in the specification, "on" means to be located above or below the target component, and does not mean that it must be located on the top based on the direction of gravity.

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementations of the method and device for customizing smart electronic equipment proposed in accordance with the present invention will be given below with reference to the accompanying drawings and preferred embodiments. The structure, characteristics and effects are described in detail later.

1, there is shown a system architecture of an inkjet print cartridge with an internal circulation system according to an embodiment of the present invention. The inkjet print cartridge 1 with an internal circulation system includes: an inkjet storage container 101, It is used to store organic luminescent material ink; a printing nozzle 102; and an inkjet internal circulation unit 110 which connects the inkjet storage container 101 and the printing nozzle 102, and adjusts the inkjet by the inkjet internal circulation unit 110 The viscosity of the organic light-emitting material ink in the storage container 101 is then printed by the printing nozzle 102.

In this embodiment, the inkjet storage container is an organic luminescent material storage container.

In this embodiment, the inkjet internal circulation unit realizes the internal circulation of the organic luminescent material ink through a transfer pump.

In this embodiment, the transfer pump is a liquid transfer pump.

In this embodiment, the liquid delivery pump controls the speed of the impeller to adjust the viscosity of the inkjet. The faster the speed of the impeller, the lower the viscosity of the inkjet. The inkjet internal circulation unit is further provided with a temperature control unit to control the factor. The temperature change caused by the rotation of the impeller.

In this embodiment, the ink jet internal circulation unit is provided with a first pressure source and a second pressure source, wherein the pressure value of the second pressure source is greater than the first pressure source, and the ink jet internal The circulation unit realizes the internal circulation of the organic luminescent material ink through the pressure difference between the first pressure source and the second pressure source.

Please refer to FIG. 2, which shows a schematic diagram of a first embodiment according to the present invention, in which a liquid transfer pump 210 is added to the lower end of the organic luminescent material storage container 201 through the pipeline in front of the print nozzle 202 to achieve the organic luminescent material Inner loop. The speed of the ink internal circulation in the organic luminescent material storage container 201 is controlled by controlling the speed of the impeller in the liquid transfer pump 210. The faster the speed of the impeller, the lower the inkjet viscosity; the inkjet internal circulation unit is equipped with a temperature control unit to control The temperature change caused by the rotation of the impeller adjusts the viscosity characteristics of the organic light-emitting material, and then prints by the printing nozzle 202.

Specifically, the relationship between the speed of the impeller and the viscosity is not only related to the speed but also to the category of the fluid itself. At present, most of the fluids used in the printing process are non-Newtonian fluids. As the speed of the impeller increases, the viscosity of the fluid will decrease, but at the same time, the friction between the impeller and the fluid will cause a local temperature increase. As time goes by, the overall temperature of the fluid will increase due to heat conduction. This part of the temperature change will cause the overall temperature to rise. In the printing process, the requirements for consistency of viscosity are very high, and the range of viscosity change is required to be within 0.2cp, in other words, the temperature rise and fall should be within 0.3°C, so this patent also proposes the need for a new internal temperature control system. The control system can be designed with a serpentine tube, where the outside of the serpentine tube is ink, and the inside of the tube is ink. For the preparation of OLED devices by the printing process, slight changes in temperature (within 0.2°C) will cause the failure of the pre-built driver waveform, which will result in low production efficiency. It is also an important feature of the present invention to provide a constant temperature internal circulation system, because after fluid movement, the temperature change is more difficult to control than static. For example, the increase in flow velocity will result in the thinning of the fluid boundary layer and the increase in internal energy generated by friction, making the internal energy consumption more serious. Therefore, in the inkjet internal circulation unit, a device that can also achieve temperature control is an extremely important issue.

Please refer to FIG. 3, which shows a schematic diagram of a second embodiment according to the present invention, in which a first pressure source 310 is provided at the top of the organic luminescent material storage container 201, and a second pressure source 320 is provided at the front end of the printing nozzle 202 , Wherein the pressure value P2 of the second pressure source 320 is greater than the pressure value P1 of the first pressure source 310, and the inkjet internal circulation unit at the top of the organic luminescent material storage container 201 and the front end of the print nozzle 202 passes through the first The pressure difference between a pressure source and the second pressure source realizes the internal circulation of the organic luminescent material storage container 201.

Specifically, the internal circulation of the organic luminescent material is realized by controlling the pressure difference between the top of the container and the front of the print nozzle. In this way, the viscosity characteristics of the organic light-emitting material are adjusted to achieve printing efficiency.

In this way, the viscosity characteristics of the organic light-emitting material are adjusted to achieve printing efficiency.

The above are only the preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed in the preferred embodiments as above, it is not intended to limit the present invention. Anyone familiar with the profession Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make slight changes or modifications to equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention is based on the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

Industrial applicability

The subject of this application can be manufactured and used in industry and has industrial applicability.

Claims

An inkjet print cartridge, which includes:

An inkjet storage container for storing organic luminescent material ink;

A print head; and

An inkjet internal circulation unit is connected to the inkjet storage container and the printing nozzle, and the viscosity of the organic luminescent material ink in the inkjet storage container is adjusted by the inkjet internal circulation unit, and then the printing nozzle is used for print.
4. The inkjet print cartridge provided with an internal circulation system according to claim 1, wherein the inkjet storage container is an organic luminescent material storage container.
The inkjet print cartridge provided with an internal circulation system according to claim 1, wherein the inkjet internal circulation unit realizes the internal circulation of the organic luminescent material ink through a transfer pump.
The inkjet print cartridge provided with an internal circulation system according to claim 3, wherein the delivery pump is a liquid delivery pump.
4. The inkjet print cartridge provided with an internal circulation system according to claim 4, wherein the liquid delivery pump controls the speed of the impeller to adjust the viscosity of the inkjet.
The inkjet print cartridge provided with an internal circulation system according to claim 5, wherein the faster the rotation speed of the impeller, the lower the inkjet viscosity.
The inkjet print cartridge provided with an internal circulation system according to claim 5, wherein the viscosity range is within 0.2 cp.
5. The inkjet print cartridge provided with an internal circulation system according to claim 5, wherein the inkjet internal circulation unit is further provided with a temperature control unit to control the temperature change caused by the rotation of the impeller.
8. The inkjet print cartridge provided with an internal circulation system according to claim 8, wherein the inkjet temperature rise and fall due to the rotation of the impeller is within 0.3°C.
The inkjet print cartridge provided with an internal circulation system according to claim 1, wherein the inkjet internal circulation unit is provided with a first pressure source and a second pressure source, and controls the top end of the container and the front end of the print nozzle by providing a first pressure source and a second pressure source. The pressure difference is used to realize the internal circulation of the organic light-emitting material.
10. The inkjet print cartridge provided with an internal circulation system according to claim 10, wherein the pressure value of the second pressure source is greater than that of the first pressure source.
The inkjet print cartridge provided with an internal circulation system according to claim 10, wherein the inkjet internal circulation unit realizes the pressure difference between the first pressure source and the second pressure source to achieve the organic light emitting material ink Inner loop.

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