WO2015027479A1

WO2015027479A1 - Method for forming color filter substrate and corresponding spraying device

Info

Publication number: WO2015027479A1
Application number: PCT/CN2013/082708
Authority: WO
Inventors: 陈孝贤
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2013-08-27
Filing date: 2013-08-30
Publication date: 2015-03-05
Also published as: CN103435267A; CN103435267B

Abstract

A method for forming a color filter substrate and a corresponding spraying device. The forming method comprises: providing a spraying device (1) having a plurality of spray heads (10), each spray head being filled with printing ink of one color; providing a substrate (2), and forming a plurality of subpixel regions (21) on the substrate, the plurality of subpixel regions being arranged in a matrix; and placing the substrate on the spraying device and moving same in one direction, and controlling the plurality of spray heads to sequentially spray printing ink of corresponding colors onto corresponding subpixel regions on the substrate once the substrate is moved a fixed distance, at least one row of subpixel regions being sequentially coated with printing ink of different colors. The product qualification rate of manufacturing color filter substrates can be improved, so that the production scheduling is more flexible.

Description

The invention relates to a method for forming a color filter substrate and a corresponding spraying device. The application is filed on August 27, 2013, the Chinese Patent Office, the application number is 201310379015.9, and the invention name is "a color filter substrate. The method and the priority of the Chinese patent application of the corresponding spraying device, the entire contents of which are incorporated herein by reference. Technical field

The present invention relates to a thin film transistor liquid crystal display (TFT-LCD) manufacturing technology, and more particularly to a method of forming a color filter substrate and a corresponding spraying device. Background technique

In the new generation of color filter manufacturing technology, in particular, inkjet-based (Ink-Jet Printing, UP) color filter manufacturing technology using a showerhead is advantageous. In this technology, The nozzle of the nozzle coats the photoresist material in a specific pixel of the glass substrate with the black matrix, and the red, green and blue (RGB) color coating of the color filter can be completed in one process. Cloth, this technology has the advantages of saving equipment, space and materials.

However, in this manufacturing method, the existing coating method and the limitation of the coating device cause a problem of color unevenness between the photoresist layers: Since different nozzles are independent mechanical devices, mechanical The difference between the difference and the operation causes the amount of spit out to be inconsistent, resulting in uneven color. Therefore, in some of the existing improved techniques, the same material is coated by using different nozzles in the same pixel.

However, in the existing manufacturing methods, color filters having different chromaticities (different color filter products) are produced by the same spraying device, and the color specifications generally need to be changed every time the product is replaced. At this time, it is necessary to replace the ink in the spraying device. First, it is necessary to clean the pipeline in the nozzle before replacing the ink, which takes a long time. Secondly, it is generally difficult to clean the pipeline in the nozzle. It is cleaned so that during the replacement of different ink materials, it is easy to form due to the incompatibility of the ink materials, resulting in colloidal condensation, which will cause loss of yield. Another In addition, the existing manufacturing method is difficult to adjust on the schedule, thereby reducing the production efficiency. Summary of the invention

The technical problem to be solved by the present invention is to provide a method of forming a color filter substrate and a corresponding spraying device, which can improve the product yield of the color filter substrate and make the production schedule more flexible.

In order to solve the above technical problems, an aspect of an embodiment of the present invention provides a method of forming a color filter substrate, the method comprising the steps of:

Providing a spraying device having a plurality of nozzles, the plurality of nozzles being filled with ink of one color, the ink comprising red, green, blue, yellow, purple ink and colorless ink; providing a substrate, a plurality of sub-pixel regions formed by a black matrix on the substrate, wherein the plurality of sub-pixel regions are arranged in a matrix;

The substrate is placed on the spraying device and moved in a fixed direction. Each time the substrate is moved a fixed distance, the plurality of nozzles are controlled to sequentially spray corresponding color inks on corresponding sub-pixel regions on the substrate. The at least one row of sub-pixel regions are sequentially coated with inks of different colors;

The nozzle having the colorless ink is sprayed in at least one sub-pixel region to supplement the film thickness of the sub-pixel region.

The method further includes the following steps:

The color ink on the substrate is cured to form a color filter in each of the sub-pixel regions.

The method further includes the following steps:

Determining a color required for each row of sub-pixel regions on the substrate;

The desired color for each of the rows of sub-pixel regions is determined, as well as the amount of ink sprayed by each nozzle.

The step of controlling the plurality of nozzles to sequentially spray the corresponding sub-pixel regions on the substrate with the ink of the corresponding color comprises:

The ink of the corresponding color is sprayed on the corresponding sub-pixel area on the substrate according to the predetermined required nozzle and the amount of ink sprayed on the corresponding nozzle. The step of controlling the plurality of nozzles to sequentially spray corresponding color inks on corresponding sub-pixel regions on the substrate includes:

Dividing all sub-pixel regions of the substrate into a plurality of positioning regions, each of the positioning regions including a fixed row of sub-pixel regions;

When the substrate is driven to the nth positioning area, the nozzle with the red ink is controlled to spray red ink on a row of the nth positioning area of the substrate to be sprayed into a red sub-pixel area;

If η-1>0 at this time, at the same time, the nozzle with the green ink is controlled to spray a green sub-pixel area on the n-1th positioning area of the substrate to spray green ink;

If n-2>0 at this time, simultaneously control the nozzle with blue ink to spray a blue ink on the row of the n-2th positioning area of the substrate;

If n-3>0 at this time, simultaneously control the nozzle with the yellow ink to spray a yellow ink on a row of red or green sub-pixel regions to be adjusted in the n-3th positioning area of the substrate;

If n-4>0 at this time, control the nozzle with purple ink to spray a purple ink on the sub-pixel area that needs to be painted in blue to the n-4 position of the substrate.

Each of the positioning areas includes three rows of sub-pixel regions.

Accordingly, as another aspect of an embodiment of the present invention, there is provided a spraying apparatus having a plurality of nozzles for spraying ink on a substrate to form a color filter substrate, wherein the substrate passes through a black matrix Forming a plurality of sub-pixel regions, wherein the plurality of sub-pixel regions are arranged in a matrix; each of the plurality of showerheads is filled with ink of one color, and the ink includes red, green, blue, yellow, Purple ink and colorless ink;

The spraying device further includes a control unit, configured to control the plurality of nozzles to sequentially spray corresponding color sub-pixel regions on the substrate for each fixed distance of the substrate, the at least A row of sub-pixel areas is sequentially coated with ink of different colors.

Wherein, the nozzle containing the colorless ink is further sprayed by the control unit in at least one sub-pixel region to supplement the film thickness of the sub-pixel region.

Wherein, the color required for each row of sub-pixel regions on the substrate is determined in advance; and the required color for each color of the sub-pixel region is determined, and the amount of ink sprayed by each nozzle is determined.

The control unit controls the plurality of nozzles to sequentially face the substrate according to the following rules Spray the corresponding color of the ink in the corresponding sub-pixel area:

Accordingly, as still another aspect of the embodiments of the present invention, there is provided a spraying apparatus, comprising: a plurality of nozzles for spraying ink on a substrate to form a color filter substrate, wherein the substrate passes through a black matrix Forming a plurality of sub-pixel regions, wherein the plurality of sub-pixel regions are arranged in a matrix; each of the plurality of showerheads is filled with ink of one color, and the ink includes red, green, blue, yellow, Purple ink and colorless ink;

The spraying device further includes a control unit, configured to control the plurality of nozzles to sequentially spray corresponding color sub-pixel regions on the substrate for each fixed distance of the substrate, the at least A row of sub-pixel regions are sequentially coated with ink of different colors; and a nozzle for controlling the colorless ink is sprayed in at least one sub-pixel region to complement the film thickness of the sub-pixel region.

The control unit controls the plurality of nozzles to sequentially spray corresponding color sub-pixel regions on the substrate according to the following rules:

Dividing all sub-pixel regions of the substrate into a plurality of positioning regions, each positioning region including fixing The sub-pixel area of the line;

Embodiments of the present invention have the following beneficial effects:

In the embodiment of the present invention, the nozzles of the spraying device are respectively filled with ink of one color, and the required chromaticity can be obtained in the sub-pixel region by the cooperation of different nozzles;

Further, a colorless ink (resin) can be used to complement the film thickness to reduce the difference in film thickness of each sub-pixel region in the entire color filter to avoid display defects due to the difference in cell thickness;

In the embodiment of the present invention, only one color is filled in the same nozzle of the spraying device, no other ink is replaced, and ink of other colors is not replaced, thereby reducing the maintenance time and the cleaning step, thereby improving the product. Yield

In addition, when making different color filters, it is only necessary to adjust the matching of different nozzles and spraying amount, without changing the nozzles, and without changing the ink in the nozzles, it is easier to adjust the scheduling, thereby improving the production efficiency.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain other drawings according to these drawings without any creative work.

1 is a mainstream of an embodiment of a method for forming a color filter substrate provided by the present invention Schematic diagram

2 is a schematic view showing a first state in an embodiment of a method of forming a color filter substrate according to the present invention;

3 is a schematic view showing a second state in an embodiment of a method of forming a color filter substrate according to the present invention;

4 is a schematic view showing a third state in an embodiment of a method of forming a color filter substrate according to the present invention;

5 is a schematic view showing a fourth state in an embodiment of a method of forming a color filter substrate according to the present invention;

6 is a schematic view showing a fifth state in an embodiment of a method of forming a color filter substrate according to the present invention;

Fig. 7 is a view showing a sixth state in an embodiment of a method of forming a color filter substrate provided by the present invention.

detailed description

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1 , it is a schematic diagram of a main flow in an embodiment of a method for forming a color filter substrate provided by the present invention; for ease of understanding, the schematic diagram in FIG. 2 is combined.

Embodiments of the present invention provide a method of forming a color filter substrate that includes the following steps:

In step S10, a spraying device 1 having a plurality of nozzles 10 is provided, and the plurality of nozzles 10 are respectively filled with ink of one color, wherein the ink comprises red, green, blue, yellow, purple ink and colorless ink. Represented by R, G, B, Y, V and Ν in the figure;

Step S11, providing a substrate 2, such as a glass substrate, on which a plurality of sub-pixel regions 21 are formed by a black matrix 20, and the plurality of sub-pixel regions are arranged in a matrix, that is, a plurality of sub-pixels are formed. Rows, and multiple sub-pixel columns;

Step S12, placing the substrate 2 on the spraying device 1 and moving the substrate 2 in a fixed direction (moving from top to bottom in FIG. 2), and controlling each of the plurality of substrates 2 by a fixed distance The nozzle 10 sequentially sprays corresponding sub-pixel regions 21 on the substrate 2 with ink of corresponding colors, wherein at least one row of sub-pixel regions is sequentially coated with ink of different colors, The fixed distance is the distance of one positioning area in FIG. 2, and the distance of the positioning area is the distance of three sub-pixel lines in one embodiment;

Step S13, spraying the nozzle 10 with the colorless ink in at least one sub-pixel region 21 to supplement the film thickness of the sub-pixel region 21;

Step S14, the colored ink sprayed on the substrate 2 is cured to form a color filter in each of the sub-pixel regions.

Wherein, before spraying the substrate 2, the following steps are first completed:

Determining the color of the spray required for each row of sub-pixel regions 21 (or each sub-pixel region) on the substrate 2;

And determining the required nozzles for the color of the spray required for each row of sub-pixel regions, and the amount of ink sprayed by each nozzle. For example, in some sub-pixel region rows, only the required color is a solid color, such as red. It is only necessary to determine the corresponding nozzle 10 filled with red ink; however, in some sub-pixel area rows, the required color is the adjusted color, it is necessary to determine the use of the two nozzles 10 and the ink sprayed by each nozzle. For example, the color required in a sub-pixel region is a blended red color, which can be achieved by combining two nozzles (a red ink jet head and a yellow ink jet head), that is, an R254 nozzle and a Y150 nozzle can be used. The ratio of the amount of spray applied is 1: 2, and so on, other colors can be obtained in a similar manner.

Specifically, the step of controlling the plurality of nozzles 10 to sequentially spray the corresponding sub-pixel regions 21 on the substrate 2 with the ink of the corresponding color is:

The ink of the corresponding color is sprayed on the corresponding sub-pixel region 21 on the substrate 2 according to the predetermined desired use of the head 10 and the amount of ink sprayed by the nozzle 10.

In one embodiment, the control unit 11 may perform the spraying process by the following spraying rules: dividing all the sub-pixel regions 21 of the substrate 2 into a plurality of positioning regions, each of which includes a fixed row (for example, 3 rows) of sub-pixels. Area 21 ;

When the substrate 2 is driven to the nth positioning area, the nozzle 10 with the red ink is controlled to spray a red ink on the row of the nth positioning area of the substrate 2 to be sprayed into the red sub-pixel region 21; if η-1> 0, simultaneously controlling the nozzle 10 with the green ink to spray a green ink on the row of the n-1th positioning region of the substrate 2 to be sprayed into the green sub-pixel region 21;

If n-2>0 at this time, simultaneously control the nozzle 10 with blue ink to the n-2th positioning area of the substrate 2. One row needs to be sprayed into a blue sub-pixel region 21 to spray blue ink;

If n-3>0 at this time, the nozzle 10 with the yellow ink is controlled to simultaneously spray a yellow ink on a row of red or green sub-pixel regions 21 to be toned in the n-3th positioning area of the substrate 2;

If n-4>0 at this time, the nozzle 10 with the purple ink is controlled at the same time. The row to be toned in the n-4th positioning area of the substrate 2 needs to be sprayed into the blue sub-pixel area 21 to spray the purple ink.

To facilitate a deeper understanding, the process of spraying ink onto a substrate in one embodiment of the present invention can be illustrated with reference to Figures 2 through 7.

Wherein, the plurality of nozzles 10 of the spraying device 2 are provided with red, green, blue, yellow, purple, and colorless special inks, and the flow direction of the substrate 2 is from top to bottom, and the sub-pixel region on the substrate 2 is divided into Multiple positioning areas (one substrate in the figure is 6 positioning areas, just for example).

As shown in FIG. 2, when the substrate 2 reaches the first positioning area, the reaching of the first positioning area means that the first positioning area of the substrate 2 faces the nozzle of the spraying device 2 with red ink, and is filled with red ink. The nozzle 10 starts to spray, and the red sub-pixel of the first positioning area is filled with red ink; since the substrate reaches the first positioning area at this time, the other nozzles of the spraying device 2 need not be sprayed; as shown in FIG. 3, when the substrate 2 When flowing to the second positioning area, the nozzle with red ink sprays red ink for the sub-pixel area in the second positioning area that needs to be painted red, and the nozzle with green ink needs to be sprayed green for the first positioning area. The pixel area is sprayed with green ink; as shown in FIG. 4, when the substrate 2 flows to the third positioning area, the nozzle with the red ink sprays red ink for the sub-pixel area in the third positioning area that needs to be painted red. The green ink nozzle sprays green ink for the sub-pixel area that needs to be painted green in the second positioning area, and the nozzle with blue ink is targeted Spraying required a location area into sub-pixel regions spraying blue blue ink;

As shown in FIG. 5, when the substrate 2 flows to the fourth positioning area, the head with the red ink sprays red ink for the sub-pixel area in the fourth positioning area that needs to be painted red, and the head with the green ink is directed to the third. In the positioning area, a sub-pixel area that needs to be sprayed with green is sprayed with green ink, and a nozzle with blue ink is sprayed with blue ink for the sub-pixel area that needs to be sprayed blue in the second positioning area, and the nozzle with yellow ink is directed to the a red color to be toned in a positioning area / a sub-pixel area to be sprayed into green is sprayed with yellow ink;

As shown in FIG. 6, when the substrate 2 flows to the fifth positioning area, the nozzle with the red ink is directed to the In the five positioning areas, the sub-pixel area that needs to be painted in red is sprayed with red ink, and the head with green ink is sprayed with green ink for the sub-pixel area that needs to be sprayed into green in the fourth positioning area, and the nozzle with blue ink is directed to the The sub-pixel area that needs to be sprayed blue in the three positioning areas is sprayed with blue ink, and the nozzle with yellow ink is sprayed with yellow ink for the red/green sub-pixel area to be toned in the second positioning area, and is filled with purple ink. The nozzle is sprayed with purple ink for the blue sub-pixel area to be toned in the first positioning area;

As shown in FIG. 7, when the substrate 2 flows to the sixth positioning area, the head with the red ink sprays red ink for the sub-pixel area in the sixth positioning area that needs to be painted red, and the head with the green ink is for the fifth. In the positioning area, the green sub-pixel area needs to be sprayed with green ink, and the blue ink head sprays blue ink for the sub-pixel area in the fourth positioning area that needs to be sprayed blue, and the nozzle with yellow ink is directed to the The red/green sub-pixel area to be toned in the three positioning areas is sprayed with yellow ink, and the nozzle with purple ink is sprayed with purple ink for the blue sub-pixel area to be toned in the first positioning area; and, in the first The substrate 2 is still in the process, and the second substrate 2 can also be directly connected, so that the idle time of the nozzle is shortened, and the production efficiency can be improved.

In addition, the final colorless nozzle is filled with ink without color, and the main purpose is to adjust the film thickness.

After all of the sub-pixel regions of one substrate 2 are sprayed with a sufficient amount of ink, it is necessary to cure (for example, UV-curable) the colored ink sprayed on the substrate 2, and to form an ITO layer (transparent conductive layer) thereon, A color filter is formed in each sub-pixel region.

Correspondingly, in another aspect of the embodiments of the present invention, a spraying apparatus 1 is provided, which has a plurality of nozzles 10 for spraying ink on the substrate 2 to form a color filter substrate, wherein the substrate 2 passes through a black matrix. 20 is formed with a plurality of sub-pixel regions 21, and a plurality of sub-pixel regions 21 are arranged in a matrix, wherein each of the nozzles 10 is filled with ink of one color, and the ink includes red, green, blue, yellow, purple inks and The coloring ink is further provided with a control unit 11 for controlling the plurality of heads 10 to sequentially spray the corresponding sub-pixel regions 21 on the substrate 2 with corresponding colors of ink when the substrate 2 is moved by a fixed distance, wherein At least one row of sub-pixel regions 21 is sequentially coated with ink of different colors.

Wherein, the nozzle containing the colorless ink is further sprayed by the control unit 11 in at least one sub-pixel region 21 to supplement the film thickness of the sub-pixel region 21. Wherein, before the spray head 10 of the spraying device 1 is sprayed, the color required for each row of the pixel regions 21 on the substrate 2 is required; and the required color for each row of the sub-pixel region 21 is determined, and each nozzle 10 is required. The amount of ink sprayed by a nozzle 10.

In one embodiment, the control unit 11 controls the plurality of heads 10 to sequentially spray the corresponding sub-pixel regions 21 on the substrate 2 with ink of a corresponding color according to the following rules:

Dividing all sub-pixel regions of the substrate 2 into a plurality of positioning regions, each of the positioning regions including a sub-pixel region of a fixed row;

When the substrate is driven to the nth positioning area, the nozzle 10 with the red ink is controlled to spray a red ink on a row of the nth positioning area of the substrate 2 to be sprayed into a red sub-pixel area;

If η-1>0 at this time, the nozzle with the green ink is controlled to spray a green ink on the row of the n-1th positioning region of the substrate to be sprayed into a green sub-pixel region;

If n-4>0 at this time, the nozzle with purple ink is controlled to spray purple ink on a row of blue sub-pixel areas to be tuned in the n-4th positioning area of the substrate.

In the embodiment of the present invention, only one color is filled in the same nozzle of the spraying device, no other ink is replaced, and ink of other colors is not replaced, so the maintenance time and the cleaning step are reduced, thereby improving the product. Yield

In addition, when making different color filters, it is only necessary to adjust the matching of different nozzles and spraying amount, without changing the nozzles, and without changing the ink in the nozzles, it is easier to adjust the scheduling, thereby improving production. effectiveness.

The above disclosure is only the preferred embodiment of the present invention, and of course, the present invention cannot be limited thereto. The scope of the claims, and thus equivalent variations, are still within the scope of the invention.

Claims

Rights request

1. A method of forming a color filter substrate, wherein the method includes the following steps: providing a spraying device with multiple nozzles, each of the multiple nozzles is filled with ink of one color, and the ink includes Red, green, blue, yellow, purple ink and colorless ink; provide a substrate, on which a plurality of sub-pixel areas are formed by a black matrix, and the plurality of sub-pixel areas are arranged in a matrix;

The substrate is placed on the spraying device and moved in a fixed direction. Each time the substrate is moved a fixed distance, the plurality of nozzles are controlled to spray ink of the corresponding color on the corresponding sub-pixel area on the substrate in sequence. The at least one row of sub-pixel areas is sequentially coated with inks of different colors;

The nozzle equipped with colorless ink is used to spray in at least one sub-pixel area to supplement the film thickness of the sub-pixel area.

2. The method of forming a color filter substrate as claimed in claim 1, further comprising the following steps:

The color ink sprayed on the substrate is cured to form a color filter in each sub-pixel area.

3. A method of forming a color filter substrate as claimed in claim 2, further comprising the following steps:

Determine the color required for each row of sub-pixel areas on the substrate;

Determine the nozzle to be used for the color required for the sub-pixel area of each row, and the amount of ink sprayed by each nozzle.

4. A method of forming a color filter substrate as claimed in claim 3, wherein the step of controlling the plurality of nozzles to sequentially spray ink of corresponding colors on corresponding sub-pixel areas on the substrate includes: :

According to the predetermined nozzle to be used and the amount of ink sprayed by the corresponding nozzle, ink of the corresponding color is sprayed on the corresponding sub-pixel area on the substrate.

5. A method of forming a color filter substrate as claimed in claim 4, wherein the step of controlling the plurality of nozzles to sequentially spray inks of corresponding colors on corresponding sub-pixel areas on the substrate includes:

Divide all sub-pixel areas of the substrate into multiple positioning areas, each positioning area including a fixed row of sub-pixel areas;

When the substrate is transported to the n-th positioning area, control the nozzle containing red ink to spray red ink on a row of sub-pixel areas in the n-th positioning area of the substrate that need to be sprayed red;

If η-1>0 at this time, simultaneously control the nozzle equipped with green ink to spray green ink on a row of the n-1th positioning area of the substrate that needs to be sprayed green in the sub-pixel area;

If n-2>0 at this time, simultaneously control the nozzle equipped with blue ink to spray blue ink on a row of the n-2 positioning area of the substrate that needs to be sprayed blue in the sub-pixel area;

If n-3>0 at this time, simultaneously control the nozzle equipped with yellow ink to spray yellow ink on a row of red or green sub-pixel areas that need to be colored in the n-3 positioning area of the substrate;

If n-4>0 at this time, simultaneously control the nozzle equipped with purple ink to spray purple ink on the sub-pixel area of the n-4th positioning area of the substrate that needs to be colored in blue.

6. A method of forming a color filter substrate as claimed in claim 5, wherein each positioning area includes three rows of sub-pixel areas.

7. A spraying device having a plurality of nozzles for spraying ink on a substrate to form a color filter substrate, wherein a plurality of sub-pixel areas are formed on the substrate through a black matrix, and the plurality of sub-pixels The regions are arranged in a matrix; among them,

Each of the plurality of nozzles is filled with one color of ink, and the ink includes red, green, blue, yellow, purple ink and colorless ink;

The spraying device further includes a control unit configured to control the plurality of nozzles to sequentially spray ink of a corresponding color on the corresponding sub-pixel area on the substrate every time the substrate moves a fixed distance, and the at least There is a row of sub-pixel areas that are sequentially coated with different colors of ink.

8. The spraying device according to claim 7, wherein the nozzle equipped with colorless ink is further controlled by the control unit to spray in at least one sub-pixel area to supplement the film thickness of the sub-pixel area. .

9. The spraying device according to claim 8, wherein before the nozzle of the spraying device 1 performs spraying, it is necessary to predetermine the colors required for each row of sub-pixel areas on the substrate; and for each row of sub-pixels The color required for the area determines the nozzles to be used and the amount of ink sprayed by each nozzle.

10. The spraying device according to claim 9, wherein the control unit controls the plurality of nozzles to sequentially spray ink of corresponding colors on the corresponding sub-pixel areas on the substrate according to the following rules:

11. A spraying device having a plurality of nozzles for spraying ink on a substrate to form a color filter substrate, wherein a plurality of sub-pixel areas are formed on the substrate through a black matrix, and the plurality of sub-pixels The regions are arranged in a matrix; among them,

Each of the plurality of nozzles is filled with one color of ink, and the ink includes red, green, blue, yellow, purple ink and colorless ink; The spraying device further includes a control unit configured to control the plurality of nozzles to sequentially spray ink of a corresponding color on the corresponding sub-pixel area on the substrate every time the substrate moves a fixed distance, and the at least There is a row of sub-pixel areas that are sequentially coated with inks of different colors; and used to control the nozzle filled with colorless ink to spray in at least one sub-pixel area to supplement the film thickness of the sub-pixel area.

12. The spraying device according to claim 11, wherein before the nozzle of the spraying device 1 performs spraying, the color required for each row of sub-pixel areas on the substrate needs to be determined in advance; and

Determine the nozzles to be used for the color required for each row of sub-pixel areas, and the amount of ink sprayed by each nozzle.

13. The spraying device according to claim 12, wherein the control unit controls the plurality of nozzles to sequentially spray ink of corresponding colors on the corresponding sub-pixel areas on the substrate according to the following rules: