CN113752702B - Ink jet printing nozzle, cleaning method thereof and ink jet printing device - Google Patents

Ink jet printing nozzle, cleaning method thereof and ink jet printing device Download PDF

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Publication number
CN113752702B
CN113752702B CN202111194080.5A CN202111194080A CN113752702B CN 113752702 B CN113752702 B CN 113752702B CN 202111194080 A CN202111194080 A CN 202111194080A CN 113752702 B CN113752702 B CN 113752702B
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China
Prior art keywords
ink
cleaning solvent
cavity
ink cavity
ultraviolet light
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CN202111194080.5A
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Chinese (zh)
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CN113752702A (en
Inventor
李欣宇
王欣欣
叶志杰
万想
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BOE Technology Group Co Ltd
Hefei BOE Zhuoyin Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei BOE Zhuoyin Technology Co Ltd
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Priority to CN202111194080.5A priority Critical patent/CN113752702B/en
Publication of CN113752702A publication Critical patent/CN113752702A/en
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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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • 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
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • 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
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16579—Detection means therefor, e.g. for nozzle clogging
    • 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
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17506—Refilling of the cartridge
    • 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/17—Cleaning arrangements

Abstract

The disclosure provides an ink-jet printing nozzle, a cleaning method thereof and an ink-jet printing device, which can solve the problems of unclean cleaning and easy waste of ink cleaning solvent when cleaning residual impurities in the ink-jet printing nozzle. The inkjet printing head of the present disclosure includes: the first ink cavity is used for injecting an ink cleaning solvent; the second ink cavity is communicated with the first ink cavity, is positioned in the detection area of the ultraviolet detector and is used for guiding the ink cleaning solvent into the detection area of the ultraviolet detector; the third ink cavity is not communicated with the first ink cavity and the second ink cavity, is positioned in the detection area of the ultraviolet detector and is used for containing an ink cleaning solvent; the ultraviolet detector is used for emitting ultraviolet light with preset wavelength to the detection area, and judging whether the first ink cavity contains impurities or not according to a comparison result of a first spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the second ink cavity and a second spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the third ink cavity.

Description

Ink jet printing nozzle, cleaning method thereof and ink jet printing device
Technical Field
The disclosure belongs to the technical field of display, and particularly relates to an ink-jet printing nozzle, a cleaning method thereof and an ink-jet printing device.
Background
An Organic Light-Emitting Diode (OLED) is a Light-Emitting device using an Organic solid semiconductor as a Light-Emitting material, and has a wide application prospect because of its advantages of simple preparation process, low cost, low power consumption, high luminance, wide working temperature application range, and the like.
At present, equipment and a process for manufacturing an OLED device by adopting an ink-jet printing method are mature, ink for manufacturing the OLED device can be sprayed onto a substrate through a printing nozzle in an ink-jet printing device, and a printing pixel pattern is formed after a solvent in the ink is volatilized. However, ink often needs to be replaced during operation of an inkjet printing head to form a film layer of a different material, e.g., a hole injection layer, a hole transport layer, a light emitting layer, etc. When the ink needs to be replaced, because the ink jet printing nozzle is of a non-transparent and closed structure, whether the ink (namely impurities) injected in the previous step is remained in the ink jet printing nozzle is difficult to directly observe, a large amount of ink cleaning solvent is often needed to clean the ink jet printing nozzle for multiple times, the cleaning efficiency is low, and the waste of the ink cleaning solvent is easily caused.
Disclosure of Invention
The present disclosure is directed to at least one of the problems of the prior art, and provides an inkjet printing head, a cleaning method thereof, and an inkjet printing apparatus.
In a first aspect, an embodiment of the present disclosure provides an inkjet printing head, including: the ink cartridge comprises a first ink cavity, a second ink cavity, a third ink cavity and an ultraviolet detector;
the first ink cavity is used for injecting an ink cleaning solvent;
the second ink cavity is communicated with the first ink cavity, is positioned in the detection area of the ultraviolet detector and is used for introducing the ink cleaning solvent into the detection area of the ultraviolet detector;
the third ink cavity is not communicated with the first ink cavity and the second ink cavity, is positioned in a detection area of the ultraviolet detector and is used for containing the ink cleaning solvent;
the ultraviolet detector is used for emitting ultraviolet light with preset wavelength to the detection area, and judging whether impurities are contained in the first ink cavity or not according to a comparison result of a first spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the second ink cavity and a second spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the third ink cavity.
Optionally, the ultraviolet detector is further configured to determine the content of the impurity according to a comparison result between a first spectrum formed by the ink cleaning solvent in the second ink chamber absorbing the ultraviolet light and a second spectrum formed by the ink cleaning solvent in the third ink chamber absorbing the ultraviolet light.
Optionally, the ultraviolet detector is further configured to determine the type of the impurity according to a first spectrum formed by the ink cleaning solvent in the second ink chamber absorbing the ultraviolet light.
Optionally, the second ink chamber and the third ink chamber are superposed and are positioned at one side of the first ink chamber;
the ultraviolet detector includes: an ultraviolet light emitting module; the ultraviolet light emitting module is located on one side of the third ink cavity, which is far away from the second ink cavity, and is used for emitting ultraviolet light with preset wavelength.
Optionally, the ultraviolet emission module comprises: deuterium lamps or mercury lamps.
Optionally, the inkjet printing head further comprises: an ink injection port and a nozzle;
the ink injection opening and the nozzle are respectively positioned at two opposite sides of the first ink cavity and are communicated with the first ink cavity.
In a second aspect, embodiments of the present disclosure provide an inkjet printing apparatus including an inkjet printing head as provided above.
In a third aspect, an embodiment of the present disclosure provides a cleaning method for an inkjet printing head, for cleaning the inkjet printing head provided as above, the cleaning method for the inkjet printing head including:
injecting an ink cleaning solvent into the first ink cavity, and introducing the ink cleaning solvent into the second ink cavity;
injecting the ink cleaning solvent into the third ink cavity;
emitting ultraviolet rays with preset wavelengths to the second ink cavity and the third ink cavity;
and judging whether the first ink cavity contains impurities or not according to a comparison result of a first spectrum formed by the ultraviolet ray absorbed by the ink cleaning solvent in the second ink cavity and a second spectrum formed by the ultraviolet ray absorbed by the ink cleaning solvent in the third ink cavity.
Optionally, the method for cleaning the inkjet printing head further comprises:
and judging the content of the impurities according to a comparison result of a first spectrum formed by absorbing the ultraviolet light by the ink cleaning solvent in the second ink cavity and a second spectrum formed by absorbing the ultraviolet light by the ink cleaning solvent in the third ink cavity.
Optionally, the method for cleaning the inkjet printing head further comprises:
and judging the type of the impurity according to a first spectrum formed by absorbing the ultraviolet light by the ink cleaning solvent in the second ink cavity.
Drawings
FIG. 1 is a schematic diagram of an exemplary inkjet print head;
fig. 2 is a schematic structural diagram of an inkjet printing head according to an embodiment of the disclosure;
FIG. 3 is a schematic top view of the inkjet print head of FIG. 2;
fig. 4 is a schematic flow chart of a cleaning method for an inkjet printing head according to an embodiment of the disclosure.
Detailed Description
For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1 is a schematic structural view of an exemplary inkjet print head, as shown in fig. 1, including: a first ink chamber 101, an ink injection port 1011, and a nozzle 1012; the ink injection port 1011 and the nozzle 1012 are respectively located at two opposite sides of the first ink chamber 101 and are both communicated with the first ink chamber 101. During operation of the inkjet printing head, ink may be injected into the first ink chamber 101 through the ink injection port 1011, and the ink may be ejected onto the substrate through the nozzles 1012 by pressure to form a print pixel. Ink often needs to be replaced during operation of an inkjet printing head to form a film layer of a different material, such as a hole injection layer, a hole transport layer, a light emitting layer, etc. When the ink needs to be replaced, because the inkjet printing nozzle is a non-transparent and closed structure, it is difficult to directly observe whether the ink (i.e., impurities) injected previously remains in the first ink chamber 101, and a large amount of ink cleaning solvent is often needed to clean the inkjet printing nozzle for multiple times, so that the cleaning efficiency is low, and the waste of the ink cleaning solvent is easily caused.
In order to solve at least one of the above technical problems, an inkjet printing head, a cleaning method thereof, and an inkjet printing apparatus are provided in the embodiments of the present disclosure, and the inkjet printing head, the cleaning method thereof, and the inkjet printing apparatus provided in the embodiments of the present disclosure will be described in further detail with reference to the accompanying drawings and the detailed description.
Fig. 2 is a schematic structural diagram of an inkjet printing head according to an embodiment of the present disclosure, and fig. 3 is a schematic structural diagram of a top view of the inkjet printing head shown in fig. 2, as shown in fig. 2 and fig. 3, the inkjet printing head according to an embodiment of the present disclosure includes: a first ink chamber 101, a second ink chamber 102, a third ink chamber 103, and an ultraviolet detector 104; the first ink chamber 101 is used for injecting ink cleaning solvent; the second ink chamber 102 is communicated with the first ink chamber 101 and is positioned in the detection area of the ultraviolet detector 104, and is used for introducing the ink cleaning solvent into the detection area of the ultraviolet detector 104; the third ink chamber 103 is not communicated with the first ink chamber 101 and the second ink chamber 102, is located in the detection area of the ultraviolet detector 104, and is used for accommodating an ink cleaning solvent; the ultraviolet detector 104 is configured to emit ultraviolet light with a preset wavelength to the detection region, and determine whether the first ink chamber 101 contains impurities according to a comparison result between a first spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the second ink chamber 102 and a second spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the third ink chamber 103.
Here, the impurity in the embodiment of the present disclosure may be another substance different from the ink to be injected at this time, for example, the previously injected ink. In practical applications, the impurities may be all substances that may affect the performance of the ink to be injected, and are not listed here. In a specific example, for example, it is previously necessary to form a hole transport layer, the ink injected into the inkjet print head is a hole transport material, a light emitting layer is currently necessary to form, and the ink injected into the inkjet print head is a light emitting material, so that the hole transport material previously injected is an impurity. Or, a red light emitting layer needs to be formed previously, the ink injected into the inkjet printing head is a red light emitting material, a green light emitting layer needs to be formed currently, and the ink injected into the inkjet printing head is a green light emitting material, so that the red light emitting material injected previously is an impurity. In order to avoid the influence of impurities on the performance of the ink injected into the inkjet printing head this time, the first ink chamber 101 of the inkjet printing head needs to be thoroughly cleaned before the ink is injected this time, so as to remove the impurities therein.
In the cleaning process of the inkjet printing head, the ink cleaning solvent may be injected into the first ink chamber 101, so that impurities possibly remaining in the first ink chamber 101 may be dissolved in the ink cleaning solvent, and the impurities in the first ink chamber may be removed by the ink cleaning solvent. Since the second ink chamber 102 is communicated with the first ink chamber 101, the ink cleaning solvent carrying impurities may be introduced into the second ink chamber 102. The third ink chamber 103 contains an ink cleaning solvent, which is a pure liquid substance. The second ink chamber 102 and the third ink chamber 103 are both located in a detection area of the ultraviolet detector 104, and the ultraviolet detector 104 can emit ultraviolet light with a preset wavelength and irradiate the second ink chamber 102 and the third ink chamber 103. Because substances in the ink cleaning solvent have a certain degree of absorption effect on ultraviolet light, and absorption effects of different substances on ultraviolet light with the same wavelength are different, the ink cleaning solvent in the third ink chamber 103 can be used as a reference, a first spectrum formed by the ink cleaning solvent in the second ink chamber 102 absorbing ultraviolet light is compared with a second spectrum formed by the ink cleaning solvent in the third ink chamber 103 absorbing ultraviolet light, if the first spectrum is the same as or substantially the same as the second spectrum, it can be determined that the first ink chamber 101 contains almost no impurities, which means that the first ink chamber 101 is cleaned, and if the first spectrum is greatly different from the second spectrum, it can be determined that the first ink chamber 101 contains a large amount of impurities, and further injection of the ink cleaning solvent into the first ink chamber 101 is required to clean and clean the first ink chamber 101 again.
In the cleaning process of the inkjet printing nozzle provided by the embodiment of the disclosure, the ultraviolet detector 104 can be used for emitting ultraviolet light with preset wavelength to monitor the ink cleaning solvent in the second ink cavity 102, and a first spectrum formed by absorbing ultraviolet light by the ink cleaning solvent in the second ink cavity 102 is compared with a second spectrum formed by absorbing ultraviolet light by the ink cleaning solvent in the third ink cavity 103, whether impurities remain in the first ink cavity 101 can be judged according to a comparison result, so that the amount of the ink cleaning solvent injected into the first ink cavity 101 can be reasonably controlled, waste of the ink solvent caused by cleaning the first ink cavity 101 by using a large amount of ink cleaning solvent can be avoided, and the usage amount of the ink cleaning solvent can be saved. Moreover, the method can avoid the blockage of the ink-jet printing nozzle caused by impurities and the mixing of the next ink, and ensure the quality of the luminescent device formed by ink-jet printing, thereby improving the display effect. Meanwhile, the cleaning efficiency of the ink-jet printing head can be improved, so that the preparation efficiency of the light-emitting device can be improved, and the preparation cost can be saved.
In some embodiments, the ultraviolet detector 104 is further configured to determine the content of the impurity according to a comparison result between a first spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the second ink chamber 102 and a second spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the third ink chamber 103.
Due to the absorption effect of substances in the ink cleaning solvent on ultraviolet rays, the incident light intensity of the ultraviolet rays before the ultraviolet rays pass through a certain substance is different from the transmission light intensity of the ultraviolet rays after the ultraviolet rays pass through the substance, and the incident light intensity and the transmission light intensity can be expressed by absorbance and are generally the ratio of the incident light intensity to the transmission light intensity. And the absorbance of the ultraviolet light by different substances is also different, so that the absorbance of the ink cleaning solvent in the second ink chamber 102 and the ink cleaning solvent in the third ink chamber 103 may be different, which may result in the first spectrum and the second spectrum being different. The larger the difference between the first spectrum and the second spectrum is, the larger the impurity content in the second ink chamber is, so that the amount of the ink cleaning solvent injected into the first ink chamber 101 is reasonably controlled, the waste of the ink cleaning solvent caused by cleaning the first ink chamber 101 by using a large amount of ink cleaning solvent can be avoided, and the using amount of the ink cleaning solvent can be saved.
In some embodiments, the ultraviolet detector 104 is further configured to determine the type of the impurity according to a first spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the second ink chamber 102.
In practical application, different impurities have different absorption effects on ultraviolet light, spectra corresponding to some impurities which are common in the ink-jet printing process can be listed, and when the formed first spectrum is compared with the spectrum polarity formed by different kinds of impurities in the list, the kinds of the impurities are identified. The reason for the impurities is deduced in the ink-jet printing operation process, and the risk that the subsequent impurities remain in the first ink cavity 101 is avoided, so that the ink-jet printing quality can be improved, and the display effect is improved.
In some embodiments, as shown in FIG. 2, the second ink chamber 102 and the third ink chamber 103 are stacked and both located on one side of the first ink chamber 101; the ultraviolet detector 104 includes: an ultraviolet light emitting module 1041; the ultraviolet light emitting module 1041 is located at a side of the third ink chamber 103 away from the second ink chamber 102, and is used for emitting ultraviolet light with a preset wavelength.
The second ink chamber 102 overlaps the third ink chamber 103, so that the occupied space of the whole ink-jet printing head can be reduced. The ultraviolet emitting module 1041 may emit ultraviolet rays, and the ultraviolet rays may simultaneously pass through the second ink chamber 102 and the third ink chamber 103 to irradiate the ink cleaning solvent therein, so that substances therein may absorb the ultraviolet rays to form a first spectrum and a second spectrum. The detection precision of ultraviolet light is higher, even very weak to the absorption of ultraviolet light, also can effectively detect to can improve the detection precision of the impurity in first ink chamber 101, and then the reasonable control ink washs the use amount of solvent, avoid using a large amount of inks to wash the waste of ink washing solvent that leads to the fact first ink chamber 101 of solvent washing, with the use amount of practicing thrift ink washing solvent. Specifically, the ultraviolet emitting module 1041 may be a deuterium lamp or a mercury lamp, or may be other types of ultraviolet lamps, which are not listed herein.
In some embodiments, the inkjet printing head further comprises: an ink injection port 1011 and a nozzle 1012; the ink injection port 1011 and the nozzle 1012 are respectively located at two opposite sides of the first ink chamber 101 and are both communicated with the first ink chamber 101.
During operation of the inkjet printing head, ink may be injected into the first ink chamber 101 through the ink injection port 1011, and the ink is ejected from the nozzle 1012 onto the substrate by pressure to form a printing pixel. When the inkjet printing head is cleaned, an ink cleaning solvent may be injected into the first ink chamber 101 through the ink injection port 1011 to clean the first ink chamber 101, so as to completely remove impurities that may remain therein.
The embodiment of the present disclosure further provides an inkjet printing apparatus, which includes the inkjet printing head provided in any of the above embodiments, in a cleaning process of the inkjet printing head, the inkjet printing head may use the ultraviolet light with a preset wavelength emitted by the ultraviolet detector 104 to monitor the ink cleaning solvent in the second ink chamber 102, and compare a first spectrum formed by the ink cleaning solvent in the second ink chamber 102 absorbing the ultraviolet light with a second spectrum formed by the ink cleaning solvent in the third ink chamber 103 absorbing the ultraviolet light, and according to a comparison result, determine whether there is impurities remaining in the first ink chamber 101, so as to reasonably control an amount of the ink cleaning solvent injected into the first ink chamber 101, thereby avoiding waste of the ink solvent caused by cleaning the first ink chamber 101 with a large amount of the ink cleaning solvent, and saving an amount of the ink cleaning solvent. Moreover, the method can avoid the blockage of the ink-jet printing nozzle caused by impurities and the mixing of the next ink, and ensure the quality of the luminescent device formed by ink-jet printing, thereby improving the display effect. Meanwhile, the cleaning efficiency of the ink-jet printing head can be improved, so that the preparation efficiency of the luminescent device can be improved, and the preparation cost can be saved.
The embodiment of the present disclosure further provides a method for cleaning an inkjet printing head, which can be used for cleaning the inkjet printing head provided in any of the above embodiments, fig. 4 is a schematic flow diagram of the method for cleaning an inkjet printing head provided in the embodiment of the present disclosure, and as shown in fig. 4, the method for cleaning an inkjet printing head includes the following steps:
s401, injecting an ink cleaning solvent into the first ink cavity, and introducing the ink cleaning solvent into the second ink cavity.
S402, injecting an ink cleaning solvent into the third ink cavity.
And S403, emitting ultraviolet rays with preset wavelengths to the second ink cavity and the third ink cavity.
S404, judging whether the first ink cavity contains impurities or not according to a comparison result of a first spectrum formed by the ultraviolet ray absorbed by the ink cleaning solvent in the second ink cavity and a second spectrum formed by the ultraviolet ray absorbed by the ink cleaning solvent in the third ink cavity.
In the cleaning process of the inkjet printing head, an ink cleaning solvent may be injected into the first ink chamber 101, so that impurities possibly remaining in the first ink chamber 101 may be dissolved in the ink cleaning solvent, and the impurities may be removed by the ink cleaning solvent. Since the second ink chamber 102 is communicated with the first ink chamber 101, the ink cleaning solvent carrying impurities can be introduced into the second ink chamber 102. The third ink chamber 103 contains an ink cleaning solvent, which is a pure liquid substance. The second ink chamber 102 and the third ink chamber 103 are both located in a detection area of the ultraviolet detector 104, and the ultraviolet detector 104 can emit ultraviolet light with a preset wavelength and irradiate the second ink chamber 102 and the third ink chamber 103. Because substances in the ink cleaning solvent have a certain degree of absorption effect on ultraviolet light, and different substances have different absorption effects on ultraviolet light with the same wavelength, the ink cleaning solvent in the third ink chamber 103 can be used as a reference, a first spectrum formed by the ink cleaning solvent in the second ink chamber 102 absorbing ultraviolet light is compared with a second spectrum formed by the ink cleaning solvent in the third ink chamber 103 absorbing ultraviolet light, if the first spectrum is the same as or substantially the same as the second spectrum, it can be determined that the first ink chamber 101 contains almost no impurities, which means that the first ink chamber 101 is cleaned, and if the first spectrum is greatly different from the second spectrum, it can be determined that the first ink chamber 101 contains a large amount of impurities, and further injection of the ink cleaning solvent into the first ink chamber 101 is required to clean and clean the first ink chamber 101 again.
In the cleaning process of the inkjet printing nozzle, the ultraviolet detector 104 can be used for emitting ultraviolet light with preset wavelength to monitor the ink cleaning solvent in the second ink cavity 102, a first spectrum formed by the ink cleaning solvent in the second ink cavity 102 absorbing ultraviolet light is compared with a second spectrum formed by the ink cleaning solvent in the third ink cavity 103 absorbing ultraviolet light, whether impurities remain in the first ink cavity 101 can be judged according to a comparison result, the amount of the ink cleaning solvent injected into the first ink cavity 101 is reasonably controlled, waste of the ink solvent caused by cleaning the first ink cavity 101 by using a large amount of ink cleaning solvent can be avoided, and therefore the using amount of the ink cleaning solvent can be saved. Moreover, the method can avoid the blockage of the ink-jet printing nozzle caused by impurities and the mixing of the next ink, and ensure the quality of the luminescent device formed by ink-jet printing, thereby improving the display effect. Meanwhile, the cleaning efficiency of the ink-jet printing head can be improved, so that the preparation efficiency of the light-emitting device can be improved, and the preparation cost can be saved.
In some embodiments, the method for cleaning an inkjet printing head further comprises: s405, judging the content of impurities according to a comparison result of a first spectrum formed by absorbing ultraviolet rays by the ink cleaning solvent in the second ink cavity and a second spectrum formed by absorbing ultraviolet rays by the ink cleaning solvent in the third ink cavity.
Due to the absorption effect of substances in the ink cleaning solvent on ultraviolet rays, the incident light intensity of the ultraviolet rays before the ultraviolet rays pass through a certain substance is different from the transmission light intensity of the ultraviolet rays after the ultraviolet rays pass through the substance, and the incident light intensity and the transmission light intensity can be expressed by absorbance and are generally the ratio of the incident light intensity to the transmission light intensity. And the absorbance of ultraviolet light by different substances is also different, so that the absorbance of the ink cleaning solvent in the second ink chamber 102 and the ink cleaning solvent in the third ink chamber 103 may be different, which may result in the first spectrum and the second spectrum being different. The larger the difference between the first spectrum and the second spectrum is, the larger the impurity content in the second ink chamber is, so that the amount of the ink cleaning solvent injected into the first ink chamber 101 is reasonably controlled, the waste of the ink cleaning solvent caused by cleaning the first ink chamber 101 by using a large amount of ink cleaning solvent can be avoided, and the using amount of the ink cleaning solvent can be saved.
In some embodiments, the method for cleaning an inkjet printing head further comprises: s406, judging the type of the impurity according to a first spectrum formed by absorbing ultraviolet rays by the ink cleaning solvent in the second ink cavity.
In practical application, different impurities have different absorption effects on ultraviolet light, spectra corresponding to some impurities which are common in the ink-jet printing process can be listed, and when the formed first spectrum is compared with the spectrum polarity formed by different kinds of impurities in the list, the kinds of the impurities are identified. The reason for the impurities is deduced in the ink-jet printing operation process, and the risk that the subsequent impurities remain in the first ink cavity 101 is avoided, so that the ink-jet printing quality can be improved, and the display effect is improved.
It will be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, and the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these changes and modifications are to be considered within the scope of the disclosure.

Claims (9)

1. An inkjet printing head, comprising: the ink cartridge comprises a first ink cavity, a second ink cavity, a third ink cavity and an ultraviolet detector;
the first ink cavity is used for injecting an ink cleaning solvent;
the second ink cavity is communicated with the first ink cavity, is positioned in the detection area of the ultraviolet detector and is used for guiding the ink cleaning solvent into the detection area of the ultraviolet detector;
the third ink cavity is not communicated with the first ink cavity and the second ink cavity, is positioned in the detection area of the ultraviolet detector and is used for containing the ink cleaning solvent;
the ultraviolet detector is used for emitting ultraviolet light with preset wavelength to a detection area and judging whether impurities are contained in the first ink cavity or not according to a comparison result of a first spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the second ink cavity and a second spectrum formed by the ultraviolet light absorbed by the ink cleaning solvent in the third ink cavity;
the second ink cavity and the third ink cavity are overlapped and are positioned on one side of the first ink cavity;
the ultraviolet detector includes: an ultraviolet light emitting module; the ultraviolet light emitting module is located on one side of the third ink cavity, which is far away from the second ink cavity, and is used for emitting ultraviolet light with preset wavelength.
2. The inkjet printing head of claim 1, wherein the ultraviolet detector is further configured to determine the content of the impurity according to a comparison result between a first spectrum formed by the ink cleaning solvent in the second ink chamber absorbing the ultraviolet light and a second spectrum formed by the ink cleaning solvent in the third ink chamber absorbing the ultraviolet light.
3. The inkjet print head of claim 1 wherein the uv detector is further configured to determine the type of the contaminant according to a first spectrum formed by the ink cleaning solvent in the second ink chamber absorbing the uv light.
4. An inkjet print head according to claim 1 wherein the ultraviolet light emitting module comprises: deuterium or mercury lamps.
5. An inkjet print head according to claim 1 further comprising: an ink injection port and a nozzle;
the ink injection opening and the nozzle are respectively positioned at two opposite sides of the first ink cavity and are communicated with the first ink cavity.
6. Inkjet printing apparatus comprising an inkjet printing head according to any of claims 1 to 5.
7. A method of cleaning an ink jet printing head according to any one of claims 1 to 5, the method comprising:
injecting an ink cleaning solvent into the first ink cavity, and introducing the ink cleaning solvent into the second ink cavity;
injecting the ink cleaning solvent into the third ink cavity;
emitting ultraviolet rays with preset wavelengths to the second ink cavity and the third ink cavity;
and judging whether the first ink cavity contains impurities or not according to a comparison result of a first spectrum formed by the ultraviolet ray absorbed by the ink cleaning solvent in the second ink cavity and a second spectrum formed by the ultraviolet ray absorbed by the ink cleaning solvent in the third ink cavity.
8. A method of cleaning an inkjet print head according to claim 7, further comprising:
and judging the content of the impurities according to a comparison result of a first spectrum formed by absorbing the ultraviolet light by the ink cleaning solvent in the second ink cavity and a second spectrum formed by absorbing the ultraviolet light by the ink cleaning solvent in the third ink cavity.
9. A method of cleaning an inkjet print head according to claim 7, further comprising:
and judging the type of the impurity according to a first spectrum formed by absorbing the ultraviolet light by the ink cleaning solvent in the second ink cavity.
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