CN109581752B - Coating method and coating system of alignment liquid - Google Patents
Coating method and coating system of alignment liquid Download PDFInfo
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- CN109581752B CN109581752B CN201811579666.1A CN201811579666A CN109581752B CN 109581752 B CN109581752 B CN 109581752B CN 201811579666 A CN201811579666 A CN 201811579666A CN 109581752 B CN109581752 B CN 109581752B
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- 238000000576 coating method Methods 0.000 title claims abstract description 242
- 239000011248 coating agent Substances 0.000 title claims abstract description 230
- 239000007788 liquid Substances 0.000 title claims abstract description 96
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 230000004888 barrier function Effects 0.000 claims description 22
- 230000000903 blocking effect Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 239000002861 polymer material Substances 0.000 claims description 12
- 239000004642 Polyimide Substances 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000010408 film Substances 0.000 description 14
- 238000002474 experimental method Methods 0.000 description 6
- 238000002910 structure generation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010835 comparative analysis Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Liquid Crystal (AREA)
Abstract
The invention relates to a coating method and a coating system of alignment liquid, wherein the coating method of the alignment liquid comprises the following steps: providing a coating area on a substrate, wherein the coating area comprises a first coating area and a second coating area, and the second coating area is arranged around the first coating area; leading a first voltage into a coating device, and enabling the coating device to coat alignment liquid on the first coating area; introducing a second voltage into the coating equipment, and enabling the coating equipment to coat the alignment liquid on the second coating area; wherein the second voltage is greater than the first voltage. The invention ensures that the discharge amount of the alignment liquid in the second coating area is larger than that of the alignment liquid in the first coating area, solves the problem of thick middle and thin edge of the alignment liquid, ensures the thickness of the formed alignment film to be uniform and improves the production yield of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a coating method and a coating system of alignment liquid.
Background
In the manufacturing process of a TFT-LCD (thin film transistor-liquid crystal display), alignment films are required to be respectively disposed on an array substrate and a color film substrate of the thin film transistor-liquid crystal display, and the alignment films are formed by solidifying an alignment liquid. When the alignment liquid is coated on the substrate, the alignment liquid has flowing diffusivity, so that the phenomenon of thick middle and thin edge of the alignment liquid is easy to occur after the coating is finished, the formed alignment film is different in thickness, the brightness of the display panel is not uniform, and the production yield of the display panel is reduced.
Disclosure of Invention
In view of the above, it is necessary to provide a method for coating an alignment liquid and a method for manufacturing an alignment film, which solve the problem of the alignment liquid having a thick middle and a thin edge, so as to form an alignment film with a uniform thickness and improve the production yield of the display panel.
A coating method of alignment liquid comprises the following steps:
providing a coating area on a substrate, wherein the coating area comprises a first coating area and a second coating area, and the second coating area is arranged around the first coating area;
leading a first voltage into a coating device, and enabling the coating device to coat alignment liquid on the first coating area;
introducing a second voltage into the coating equipment, and enabling the coating equipment to coat the alignment liquid on the second coating area;
wherein the second voltage is greater than the first voltage.
In one embodiment, the first coating region is a display region on the substrate.
In one embodiment, the first voltage is obtained first, and then the second voltage is obtained according to the first voltage.
In one embodiment, before the alignment liquid is coated, a barrier structure is formed around the coating area, and the barrier structure is used for blocking the alignment liquid from diffusing out of the coating area.
In one embodiment, after the alignment liquid is coated, the barrier structure is removed.
In one embodiment, the material used for the barrier structure is a polymer material that can be hardened and formed in air.
According to the coating method of the alignment liquid, the coating area is divided into the first coating area and the second coating area, the first coating area is arranged in the middle, the second coating area is arranged around the first coating area, different voltages are respectively provided for the first coating area and the second coating area, the discharge amount of the alignment liquid in the second coating area is larger than that of the alignment liquid in the first coating area, the problem that the middle of the alignment liquid is thick and the edge of the alignment liquid is thin is solved, the thickness of the formed alignment liquid is uniform, and the production yield of the display panel is improved.
Based on the inventive concept, a coating method of alignment liquid is provided, which comprises the following steps:
providing a coating area on a substrate, wherein the coating area comprises a first coating area and a second coating area, and the second coating area is arranged around the first coating area;
forming a barrier structure around the coating area, wherein the barrier structure is used for blocking the alignment liquid from diffusing out of the coating area;
leading a first voltage into a coating device, and enabling the coating device to coat alignment liquid on the first coating area;
introducing a second voltage into the coating equipment, and enabling the coating equipment to coat the alignment liquid on the second coating area;
removing the blocking structure;
the second voltage is greater than the first voltage, the first voltage is obtained first, and then the second voltage is obtained according to the first voltage;
the first coating area is a display area on the substrate;
the blocking structure is made of a high polymer material which can be hardened and formed in the air.
According to the coating method of the alignment liquid, the coating area is divided into the first coating area and the second coating area, the first coating area is arranged in the middle, the second coating area is arranged around the first coating area, different voltages are respectively provided for the first coating area and the second coating area, the discharge amount of the alignment liquid in the second coating area is larger than that of the alignment liquid in the first coating area, the problem that the middle of the alignment liquid is thick and the edge of the alignment liquid is thin is solved, the thickness of the formed alignment liquid is uniform, and the production yield of the display panel is improved.
Based on the inventive concept, a rubbing liquid coating system is provided, which comprises:
a coating region setting unit for setting a first coating region and a second coating region;
the first power supply unit is used for providing a first voltage for the first coating area;
the second power supply unit is used for providing a second voltage for the second coating area;
the coating driving unit is used for driving a coating device to coat the substrate and is respectively connected with the coating area setting unit, the first power supply unit and the second power supply unit;
wherein the second coating region is set around the first coating region; the second voltage is greater than the first voltage.
In one embodiment, the first coating region corresponds to a display region on the substrate.
In one embodiment, the power supply device further comprises a control unit, wherein the control unit is respectively connected with the first power supply unit and the second power supply unit and used for adjusting the first voltage and the second voltage.
The alignment liquid coating system divides the coating area into a first coating area and a second coating area, the first coating area is arranged in the middle, the second coating area is arranged around the first coating area, different voltages are respectively provided for the first coating area and the second coating area, the discharge amount of the alignment liquid in the second coating area is larger than that of the alignment liquid in the first coating area, the problem that the middle of the alignment liquid is thick and the edge of the alignment liquid is thin is solved, the thickness of the formed alignment film is uniform, and the production yield of the display panel is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow diagram of a method in one embodiment;
FIG. 2 is a schematic structural diagram in one embodiment;
FIG. 3 is a flow chart of a method in another embodiment;
FIG. 4 is a schematic structural view in another embodiment;
FIG. 5 is a schematic circuit diagram of one embodiment;
FIG. 6 is a schematic view of the structure of a coated area in one embodiment;
fig. 7 is a circuit schematic in another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
A method for coating alignment liquid, as shown in fig. 1-2, includes:
s101, arranging a coating area on a substrate 200, wherein the coating area comprises a first coating area 201 and a second coating area 202, and arranging the second coating area 202 around the first coating area 201;
s102, introducing a first voltage into a coating device, so that the coating device coats an alignment liquid on the first coating region 201;
s103, introducing a second voltage into the coating device, so that the coating device coats the alignment liquid on the second coating region 202;
the second voltage is greater than the first voltage, so that the discharge amount of the alignment liquid in the second coating area 202 is greater than that of the alignment liquid in the first coating area 201, the problem that the middle of the alignment liquid coated on the substrate 200 is thick and the edge of the alignment liquid is thin is solved, the thickness of the formed alignment film is uniform, and the production yield of the display panel is improved.
Wherein, the alignment liquid is polyimide.
In one embodiment, as shown in fig. 2, the first coating region 201 is a display region on the substrate 200, that is, the area of the first coating region 201 is the same as the area of the display region; the second coating region 202 is disposed around the first coating region 201, and the optimal area of the second coating region 202 can be determined by experimentally collecting a large amount of data and performing comparative analysis.
In one embodiment, the first voltage is obtained first, and then the second voltage is obtained according to the first voltage. The first voltage is selected according to the selectable values in the coating apparatus, and after the first voltage is determined, the second voltage is selected experimentally.
In the above experiment, the specific steps of one experiment are as follows: after the alignment liquid was applied to the first coating region, the voltage was increased in addition to the first voltage, the second coating region was coated, the condition of the film surface on the substrate was observed at the voltage, the film thickness was measured after the coating was completed, and finally the display condition of the substrate after lighting was tested. And changing the increased voltage amount on the basis of the first voltage, repeating the steps, and collecting a large amount of data to determine the second voltage.
In one embodiment, as shown in fig. 3 and 4, the step of the method for coating the alignment liquid further includes: before coating the alignment liquid, forming a barrier structure 403 around the coating region; after the alignment liquid is coated, the barrier structure 403 is removed.
Therefore, in this embodiment, the method for coating the alignment liquid includes:
s301, arranging a coating area on the substrate 400, wherein the coating area comprises a first coating area 401 and a second coating area 402, and the second coating area 402 is arranged around the first coating area 401;
s302, forming a blocking structure 403 around the coating area;
s303, introducing a first voltage into the coating device to make the coating device coat the alignment liquid on the first coating region 401;
s304, introducing a second voltage into the coating equipment to enable the coating equipment to coat the alignment liquid on the second coating area 402;
s305, removing the blocking structure 403.
The barrier structure 403 is used to prevent the alignment liquid from diffusing out of the coating area, and the material used is a polymer material that can be cured and molded in air. Specifically, the polymer material may be a single polymer material or a mixed polymer material, and is not specifically limited in this embodiment; the cross section of the blocking structure may be triangular, square, trapezoid or other shapes according to practical situations, and is not particularly limited in this embodiment.
In step S305, the barrier structure 403 is removed by heating, spraying a solvent, or etching.
In the coating method of the alignment liquid, the barrier structure 403 is formed around the coating region, so that the alignment liquid can be prevented from diffusing out of the coating region and affecting other circuit structures on the substrate; the coating area is divided into a first coating area 401 and a second coating area 402, the first coating area 401 is arranged in the middle, the second coating area 402 is arranged around the first coating area 401, different voltages are respectively provided for the first coating area 401 and the second coating area 402, the discharge amount of the alignment liquid in the second coating area 402 is larger than that of the alignment liquid in the first coating area 401, the problem that the middle of the alignment liquid coated on the substrate 400 is thick and the edge of the alignment liquid is thin is solved, the thickness of the formed alignment film is uniform, and the production yield of the display panel is improved.
Based on the above inventive concept, an alignment liquid coating system is provided, as shown in fig. 5 and 6, including:
a coating region setting unit 501 for setting a first coating region 601 and a second coating region 602;
a first power supply unit 502 for supplying a first voltage to the first coating region 601;
a second power supply unit 503 for supplying a second voltage to the second coating region 602;
a coating driving unit 504 for driving a coating device to coat the substrate, wherein the coating driving unit 504 is respectively connected with the coating region setting unit 501, the first power supply unit 502 and the second power supply unit 503;
the second coating area 602 is set around the first coating area 601, the second voltage is greater than the first voltage, so that the discharge amount of the alignment liquid in the second coating area 602 is greater than that of the alignment liquid in the first coating area 601, the problem that the middle of the alignment liquid coated on the substrate 200 is thick and the edge of the alignment liquid is thin is solved, the thickness of the formed alignment film is uniform, and the production yield of the display panel is improved.
Wherein, the alignment liquid is polyimide.
In one embodiment, the first coating region 601 corresponds to a display region on the substrate, i.e., in the coating system, the area of the first coating region 601 can be set according to the display region on the substrate. The second coating region 602 is set around the first coating region 601, and the optimal area of the second coating region 602 can be determined by collecting a large amount of data through experiments and performing comparative analysis.
In one embodiment, with continued reference to fig. 5-6, the coating system further comprises a control unit 505, the control unit 505 being connected to the first power supply unit 502 and the second power supply unit 503, respectively, for regulating the first voltage and the second voltage. The first voltage can be selected according to selectable values in the coating equipment, after the first voltage is determined, the quantity relation between the first voltage and the parameters, the second voltage and the parameters is established through an experiment acquisition database, and the second voltage is selected.
In the above experiment, the specific steps of one experiment are as follows: after the alignment liquid was applied to the first application area 601, the voltage was increased in addition to the first voltage, the second application area 602 was applied, the film surface condition on the substrate was observed at the voltage, the film thickness was measured after the application was completed, and finally the display condition of the substrate after lighting was tested. And changing the increased voltage amount on the basis of the first voltage, repeating the steps, and collecting a large amount of data to determine the second voltage.
In one embodiment, as shown in fig. 7, the coating system further includes a blocking structure generation and removal unit 506, the blocking structure generation and removal unit 506 is connected to the control unit 505, before the alignment solution is coated, the control unit 505 controls the blocking structure generation and removal unit 506 to form a blocking structure around the coating region on the substrate, so as to prevent the alignment solution from diffusing out of the coating region and affecting other circuit structures on the substrate; and after coating is finished, an instruction is given to cause the barrier structure generation and removal unit 506 to remove the barrier structure, specifically, the barrier structure can be removed by heating, solvent spraying or etching.
The barrier structure is made of a polymer material that can be hardened and molded in air, specifically, the polymer material may be a single polymer material or a mixed polymer material, which is not specifically limited in this embodiment; the cross section of the blocking structure may be triangular, square, trapezoid or other shapes according to practical situations, and is not particularly limited in this embodiment.
The alignment liquid coating system forms the barrier structure around the coating area on the substrate, so that the alignment liquid can be prevented from diffusing out of the coating area to influence other circuit structures on the substrate, and the production yield of the display panel is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A coating method of alignment liquid is characterized by comprising the following steps:
providing a coating area on a substrate, wherein the coating area comprises a first coating area and a second coating area, and the second coating area is arranged around the first coating area;
leading a first voltage into a coating device, and enabling the coating device to coat alignment liquid on the first coating area;
introducing a second voltage into the coating equipment, and enabling the coating equipment to coat the alignment liquid on the second coating area;
wherein the second voltage is greater than the first voltage so that the discharge amount of the alignment liquid in the second coating area is greater than the discharge amount of the alignment liquid in the first coating area; the first voltage is obtained first, and then the second voltage is obtained according to the first voltage.
2. The method for coating the alignment liquid according to claim 1, wherein the first coating region is a display region on the substrate.
3. The method for coating the alignment liquid according to claim 1, wherein the alignment liquid is polyimide.
4. The method according to claim 1, wherein a barrier structure is formed around the coating region before the coating of the alignment liquid, and the barrier structure is used for preventing the alignment liquid from diffusing out of the coating region.
5. The method according to claim 4, wherein the barrier structure is removed after the alignment liquid is coated.
6. The method for coating the alignment liquid according to claim 4 or 5, wherein the barrier structure is made of a polymer material that can be cured and molded in air.
7. A coating method of alignment liquid is characterized by comprising the following steps:
providing a coating area on a substrate, wherein the coating area comprises a first coating area and a second coating area, and the second coating area is arranged around the first coating area;
forming a barrier structure around the coating area, wherein the barrier structure is used for blocking the alignment liquid from diffusing out of the coating area;
leading a first voltage into a coating device, and enabling the coating device to coat alignment liquid on the first coating area;
introducing a second voltage into the coating equipment, and enabling the coating equipment to coat the alignment liquid on the second coating area;
removing the blocking structure;
the second voltage is greater than the first voltage, the first voltage is obtained first, and then the second voltage is obtained according to the first voltage; so that the discharge amount of the alignment liquid in the second coating area is larger than that in the first coating area;
the first coating area is a display area;
the blocking structure is made of a high polymer material which can be hardened and formed in the air.
8. An alignment liquid coating system is characterized by comprising:
a coating region setting unit for setting a first coating region and a second coating region;
the first power supply unit is used for providing a first voltage for the first coating area;
the second power supply unit is used for providing a second voltage for the second coating area; the second voltage is determined according to the first voltage;
the coating driving unit is used for driving a coating device to coat the substrate and is respectively connected with the coating area setting unit, the first power supply unit and the second power supply unit;
wherein the second coating region is set around the first coating region; the second voltage is greater than the first voltage; so that the discharge amount of the alignment liquid in the second coating area is larger than that in the first coating area.
9. The alignment liquid coating system of claim 8, wherein the first coating region corresponds to a display region on the substrate.
10. The alignment liquid coating system according to claim 8, further comprising a control unit, wherein the control unit is connected to the first power supply unit and the second power supply unit respectively, and is configured to adjust the first voltage and the second voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579666.1A CN109581752B (en) | 2018-12-24 | 2018-12-24 | Coating method and coating system of alignment liquid |
| PCT/CN2018/124659 WO2020133153A1 (en) | 2018-12-24 | 2018-12-28 | Alignment liquid coating method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811579666.1A CN109581752B (en) | 2018-12-24 | 2018-12-24 | Coating method and coating system of alignment liquid |
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| CN109581752A CN109581752A (en) | 2019-04-05 |
| CN109581752B true CN109581752B (en) | 2021-07-27 |
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| CN114624913A (en) * | 2022-03-24 | 2022-06-14 | 广州华星光电半导体显示技术有限公司 | Display panel manufacturing method and device and display panel |
| CN114624914B (en) * | 2022-03-25 | 2024-01-09 | 广州华星光电半导体显示技术有限公司 | Liquid crystal display panel |
| CN114779533A (en) * | 2022-04-11 | 2022-07-22 | Tcl华星光电技术有限公司 | Alignment film and preparation method thereof |
| CN114721187A (en) * | 2022-04-28 | 2022-07-08 | 广州华星光电半导体显示技术有限公司 | Manufacturing method of alignment film and liquid crystal display panel |
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| WO2011155133A1 (en) * | 2010-06-10 | 2011-12-15 | シャープ株式会社 | Liquid crystal display device and production method thereof |
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| JP4993973B2 (en) * | 2006-09-08 | 2012-08-08 | 株式会社ジャパンディスプレイイースト | Liquid crystal display |
| JP2009258554A (en) * | 2008-04-21 | 2009-11-05 | Seiko Epson Corp | Composition for forming liquid crystal alignment film and method for manufacturing liquid crystal display device |
| JP2009288483A (en) * | 2008-05-29 | 2009-12-10 | Seiko Epson Corp | Liquid crystal device, manufacturing method thereof, and electronic apparatus |
| JP5520614B2 (en) * | 2010-01-15 | 2014-06-11 | 株式会社ジャパンディスプレイ | Liquid crystal display device and manufacturing method thereof |
| CN102809851B (en) * | 2012-08-22 | 2015-01-21 | 深圳市华星光电技术有限公司 | Method for coating alignment film |
| CN103091904B (en) * | 2013-01-25 | 2015-05-13 | 合肥京东方光电科技有限公司 | Preparation method of display panel |
| CN203444196U (en) * | 2013-08-28 | 2014-02-19 | 京东方科技集团股份有限公司 | Substrate and display device provided with same |
| CN104722458A (en) * | 2015-04-09 | 2015-06-24 | 武汉华星光电技术有限公司 | Device and method for coating alignment liquid of substrate |
| CN104898326B (en) * | 2015-06-05 | 2018-08-07 | 深圳市华星光电技术有限公司 | A kind of forming method of alignment film |
| CN105080788B (en) * | 2015-07-31 | 2017-09-29 | 深圳市华星光电技术有限公司 | Frame glue apparatus for coating and coating method |
| CN106383421A (en) * | 2016-11-07 | 2017-02-08 | 深圳市华星光电技术有限公司 | Manufacturing method of alignment film, display panel and display device |
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| CN107085324B (en) * | 2017-06-09 | 2020-06-05 | 厦门天马微电子有限公司 | Substrate and liquid crystal display panel comprising same |
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- 2018-12-28 WO PCT/CN2018/124659 patent/WO2020133153A1/en active Application Filing
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|---|---|---|---|---|
| WO2011155133A1 (en) * | 2010-06-10 | 2011-12-15 | シャープ株式会社 | Liquid crystal display device and production method thereof |
| CN105467687A (en) * | 2016-01-08 | 2016-04-06 | 深圳市华星光电技术有限公司 | Liquid crystal display and manufacturing method thereof |
| CN107957643A (en) * | 2017-12-15 | 2018-04-24 | 张家港康得新光电材料有限公司 | The preparation method of orientation template and 3D liquid crystal cells |
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|---|---|
| CN109581752A (en) | 2019-04-05 |
| WO2020133153A1 (en) | 2020-07-02 |
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