Preparation method of light filter plate, light filter plate and display panel

Abstract

The application relates to a filter plate preparation method, a filter plate and a display panel. The filter plate preparation method comprises the following steps: providing a substrate. The substrate comprises a starting edge, which is an edge that starts coating first when a coating process is performed on the substrate. The substrate is also provided with a pseudo color film area and a color film area. The pseudo color film area and the color film area are alternately arranged from the starting edge, and the first area and the last area from the starting edge are both pseudo color film areas. A supporting carrier plate is arranged on the substrate, and the supporting carrier plate is located in the pseudo color film area. The supporting carrier plate is used for supporting the coated color film material. At least three color film materials are sequentially coated on one side of the substrate provided with the supporting carrier plate in the same coating direction. The distance between the edge closest to the starting edge of the first coated color film material and the starting edge is greater than or equal to 50 microns. According to the embodiment of the application, the color film material can be effectively prevented from being torn and cracked.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a method for preparing a filter plate, the filter plate, and a display panel. Background Technology

[0002] In related technologies, with the development of display technology, the application range of monitors is becoming increasingly wide. As monitors are used in various life scenarios, people's requirements for monitors are also increasing, placing higher demands on performance aspects such as color gamut, viewing angle, contrast ratio, response time, and power consumption. Among these, ultra-high color gamut has become an increasingly important parameter.

[0003] As demand for ultra-high color gamut products increases, current color filter materials, at their existing thicknesses, cannot meet the requirements for ultra-high color gamut, and a new generation of ultra-high color gamut color filter materials has not yet been fully developed. In response to this situation, the only way to improve color gamut is to increase the thickness of existing color filter materials. However, this approach is prone to problems such as film formation failure and film breakage. Summary of the Invention

[0004] According to a first aspect of the embodiments of this application, a method for preparing a filter plate is provided, comprising:

[0005] A substrate is provided; the substrate includes a starting edge, which is the edge where the coating process begins first when coating is performed on the substrate; the substrate also has a pseudo-color filter area and a color filter area, the pseudo-color filter area and the color filter area are arranged alternately starting from the starting edge, and the first area and the last area starting from the starting edge are both the pseudo-color filter area;

[0006] A support carrier plate is disposed on the substrate, and the support carrier plate is located in the pseudo color filter area; the support carrier plate is used to support the coated color filter material.

[0007] On the side of the substrate where the support carrier is located, at least three types of color filter materials are sequentially coated along the same coating direction; the distance between the edge of the first coated color filter material and the edge closest to the starting edge is greater than or equal to 50 micrometers.

[0008] As can be seen from the above embodiments, by ensuring that the distance between the edge of the first-formed color filter material closest to the starting edge and the starting edge is greater than or equal to 50 micrometers, the higher step formed by the first-formed color filter material and the supporting substrate can be converted into two smaller steps. Furthermore, a distance of greater than or equal to 50 micrometers between the edges of the first edge and the starting edge provides sufficient space to ensure that the color filter material successively crosses the two steps, rather than crossing the height of both steps almost simultaneously due to the properties of the liquid. Therefore, when the color filter material is formed after coating, it can be prevented from crossing the higher step formed by the color filter material and the supporting substrate all at once, thereby effectively preventing tearing and cracking of the color filter material.

[0009] In some embodiments, the color filter material includes a red color filter material, a green color filter material, and a blue color filter material; the color filter material is formed sequentially in the order of the red color filter material, the green color filter material, and the blue color filter material; and the thickness of the red color filter material, the green color filter material, and the blue color filter material is greater than or equal to 0.2 micrometers and less than 1.4 micrometers.

[0010] In some embodiments, the color filter material closest to the starting edge is a red color filter material; starting from the starting edge, the color filter materials are arranged cyclically in the order of the red color filter material, the green color filter material and the blue color filter material;

[0011] The process of coating the color filter material also includes:

[0012] When forming the red film material, the forming begins at a distance of 50 micrometers or more from the starting edge.

[0013] In some embodiments, the color filter material closest to the starting edge is a blue color filter material; starting from the starting edge, the color filter materials are arranged cyclically in the order of the blue color filter material, the green color filter material and the red color filter material;

[0014] The process of coating the color filter material also includes:

[0015] When forming the red color film material, the formation begins at a distance of 100 micrometers or more from the starting edge.

[0016] In some embodiments, the red color filter material, the green color filter material and the blue color filter material constitute a complete cycle; the color filter materials located in the color filter area all constitute the complete cycle.

[0017] In some embodiments, a color film material is coated onto the substrate through a spray nozzle; the spray nozzle moves at a speed of 100 millimeters per second during coating.

[0018] In some embodiments, a color film material is coated on the substrate through a spray nozzle; the distance from the spray nozzle to the substrate is 90 micrometers.

[0019] In some embodiments, a first structure to be segmented is formed after the color filter material is coated; after the color filter material is coated, the structure further includes:

[0020] The first structure to be divided is divided according to the difference between the pseudo-color filter area and the color filter area, and the portion located in the pseudo-color filter area is removed to obtain the second structure to be divided; the second structure to be divided is divided according to a preset size, and the substrate is removed to obtain the filter plate.

[0021] According to a second aspect of the embodiments of this application, a filter plate is provided, which is formed by any of the filter plate preparation methods described above.

[0022] According to a third aspect of the embodiments of this application, a display panel is provided, including the above-described filter plate, the display panel further including: a light-emitting layer; the side of the display panel that mainly emits light is the light-emitting side; the filter plate is located on the side of the light-emitting layer facing the light-emitting side.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 The diagram shows an intermediate structure in the fabrication process of a color filter.

[0026] Figure 2 What is shown is Figure 1 The intermediate structure shown is a top view after it has been torn apart.

[0027] Figure 3 This is a flowchart illustrating a method for preparing a filter plate according to an embodiment of this application.

[0028] Figure 4 This is a top view of an intermediate structure during the filter fabrication process, as shown in the embodiments of this application.

[0029] Figure 5 As shown in the embodiments of this application Figure 4 A sectional view along section line AA.

[0030] Figure 6 This is a top view of another intermediate structure in the filter preparation process shown in the embodiments of this application.

[0031] Figure 7 This is a schematic diagram of the structure of the coating process performed at the spray nozzle according to the embodiments of this application. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0033] In current display technologies, the thickness of current color filter materials is insufficient to meet the demands of ultra-high color gamut, and a new generation of ultra-high color gamut color filter materials has not yet been fully developed. Therefore, to improve the color gamut of display panels, it is necessary to increase the thickness of the color filter layer in the color filter. That is, during the fabrication of the color filter, the thickness of the coated color filter material needs to be increased. However, referring to... Figure 1 The intermediate structure shown in the filter fabrication process, in existing filter fabrication processes, after the support plate 120' is placed on the substrate 110' and the coating process is performed, the color filter material 130' formed on the support plate 120' together with the support plate 120' forms a step T' with a height higher than in conventional processes. When subsequent coatings of other color filter materials 130' are applied, they need to cross this thicker step T', making them prone to tearing at this step T'. Especially when coating blue color filter material, since the coating process is generally carried out in the order of red, green, and then blue, and the thickness of the blue color filter material is less than that of the other color filter materials, tearing is more likely to occur when coating blue color filter material. (Refer to...) Figure 2 What is shown is Figure 1 The top view shown is of the intermediate structure after it has been torn. The crack L' produced by the tear then spreads and affects more filters in the manufacturing process.

[0034] This application provides a method for preparing a filter plate. Figure 3 The flowchart shown is a method for preparing this filter plate. For example... Figure 3 As shown, the preparation method of the filter plate includes steps S110 to S130.

[0035] In step S110, a substrate 110 is provided. (See reference...) Figure 4 This is a top view of the intermediate structure during the filter fabrication process, and... Figure 5 Shown Figure 4A cross-sectional view along section line AA. The substrate 110 includes a starting edge 111, which is the edge where coating begins first during the coating process on the substrate 110. The substrate 110 also has a pseudo-color filter region 101 and a color filter region 102. Starting from the starting edge 111, the pseudo-color filter region 101 and the color filter region 102 are arranged alternately, and the first and last regions starting from the starting edge 111 are both pseudo-color filter regions 101.

[0036] In step S120, a support carrier plate 120 is disposed on the substrate 110, and the support carrier plate 120 is located in the pseudo color filter region 101. The support carrier plate 120 is used to support the coated color filter material 130.

[0037] Specifically, when coating the color filter material 130 onto the substrate 110, since the color filter material 130 is a readily flowing liquid during coating, and it is coated across the entire substrate 110 to form a color filter before removing excess color filter material 130, the coated color filter material 130 is prone to breakage and tearing due to factors such as liquid surface tension and fluidity. Furthermore, the cracks generated by the tearing can propagate within the color filter material 130 on the substrate 110, resulting in larger cracks.

[0038] By separating the pseudo-color filter area 101 and the color filter area 102, and by first setting a support plate 120 in the pseudo-color filter area 101 and then coating the color filter material, the probability of tearing when coating the color filter material 130 can be reduced by using the support plate 120.

[0039] Furthermore, by alternating between the pseudo-color filter area 101 and the color filter area 102, the probability of tearing of the color filter material 130 in the pseudo-color filter area 101 can be reduced during the coating of the color filter material 130 by the support plates 120 located on both sides of the color filter area 102. Since the color filter material 130 is coated in a single strip and the excess color filter material 130 is removed after forming the color filter, the support plates 120 stabilize the properties of the color filter material 130 in the pseudo-color filter area 101, and the properties of the color filter material 130 in the color filter area 102 can be further stabilized by the single-strip coating of the color filter material 130.

[0040] In step S130, the substrate 110 has a side with a support carrier 120, and at least three types of color filter materials 130 are sequentially coated along the same coating direction. The distance between the edge of the first coated color filter material 130 and the starting edge 111 is greater than or equal to 50 micrometers.

[0041] Specifically, the color filter material 130 may include three types of color filter materials 130, namely red color filter material 130R, green color filter material 130G and blue color filter material 130B, but is not limited thereto. In other embodiments, the color filter material 130 may include more types of color filter materials 130.

[0042] By ensuring that the distance between the edge of the first-formed color filter material 130 closest to the starting edge 111 and the starting edge 111 is greater than or equal to 50 micrometers, the higher step formed by the first-formed color filter material 130 and the supporting substrate 120 can be converted into two smaller steps, i.e. Figure 5 The first step T1 and the second step T2 are shown in the figure. Furthermore, the distance between the nearest edge of the starting edge 111 and the starting edge 111 is greater than or equal to 50 micrometers, which provides sufficient space to ensure that the color filter material 130 crosses the first step T1 and the second step T2 successively, rather than crossing the height of the first step T1 and the second step T2 in one go under the influence of liquid properties. Therefore, when the color filter material 130 is formed after coating, it can be avoided that the color filter material 130 crosses the higher step formed by the color filter material 130 and the supporting carrier plate 120 in one go. In addition, it can effectively prevent the color filter material 130 from tearing and cracking.

[0043] In some embodiments, such as Figure 5 As shown, the color filter material 130 includes a red color filter material 130R, a green color filter material 130G, and a blue color filter material 130B. The color filter material 130 is formed sequentially in the order of red color filter material 130R, green color filter material 130G, and blue color filter material 130B. The thickness of each of the red color filter material 130R, green color filter material 130G, and blue color filter material 130B is greater than or equal to 0.2 micrometers and less than 1.4 micrometers.

[0044] Specifically, the thickness of the red color filter material 130R, the green color filter material 130G, and the blue color filter material 130B is all greater than or equal to 0.2 micrometers. Taking the green color filter material 130G as an example, it is... Figure 5 The thickness H shown is greater than or equal to 0.2 micrometers. The thickness of the red color film material 130R and the blue color film material 130B can be referenced to the thickness of the green color film material 130G.

[0045] Through experiments, the inventors discovered that the support plate 120, to ensure its proper function, has a thickness of approximately 1.2 micrometers. However, when the thickness of the color filter material 130 is greater than or equal to 0.2 micrometers, if the distance between the nearest edge of the color filter material 130 to the starting edge 111 and the starting edge 111 is not greater than or equal to 50 micrometers, then the shared height of the first-formed color filter material 130 and the support plate 120 can easily cause tearing of the color filter material 130 spanning this portion.

[0046] When the thickness of the color filter material 130 is greater than or equal to 0.2 micrometers, the resulting color filter plate has a relatively thick color filter, thus ensuring that the display panel using this filter plate can have a higher color gamut. Furthermore, since the thickness of the color filter material is greater than or equal to 0.2 micrometers, and the distance between the nearest edge of the color filter material 130 to the starting edge 111 and the starting edge 111 is greater than or equal to 50 micrometers, this effectively prevents the color filter material 130 from tearing and cracking while ensuring that the display panel using this filter plate can have a higher color gamut.

[0047] In some embodiments, such as Figure 5 As shown, the color filter material 130 closest to the starting edge 111 is the red color filter material 130R. Starting from the starting edge 111, the color filter materials 130 are arranged in a cyclical order of red color filter material 130R, green color filter material 130G to blue color filter material 130B.

[0048] The process of coating the color film material 130 also includes:

[0049] The red colored film material 130R is formed starting from a distance of 50 micrometers or more from the starting edge 111.

[0050] Specifically, in this embodiment, during the coating process, starting from the starting edge 111, along... Figure 5 The coating is applied in the first direction X as shown.

[0051] By ensuring that the distance between the nearest edge of the first-formed color filter material 130 (i.e., the red color filter material 130R) and the starting edge 111 is greater than or equal to 50 micrometers, the higher step formed by the previously formed color filter material 130 and the supporting carrier plate 120 can be converted into the first step T1 and the second step T2. Furthermore, the distance between the nearest edge of the starting edge 111 and the starting edge 111 is greater than or equal to 50 micrometers, providing sufficient space to ensure that the color filter material 130 successively crosses the first step T1 and the second step T2. Therefore, when the color filter material 130 is formed after coating, it can be prevented from crossing the heights of the first step T1 and the second step T2 in one go, thereby effectively preventing tearing and cracking of the color filter material 130.

[0052] In some embodiments, Figure 6 This is a top view of another intermediate structure in the filter fabrication process. (Example:) Figure 6 As shown, the color filter material 130 closest to the starting edge 111 is the blue color filter material 130B. Starting from the starting edge 111, the color filter materials 130 are arranged in a cyclical order of blue color filter material 130B, green color filter material 130G and red color filter material 130R.

[0053] The process of coating the color film material 130 also includes:

[0054] When forming the red color film 130B material, the formation begins at a distance of 100 micrometers or more from the starting edge 111.

[0055] Specifically, in this embodiment, during the coating process, starting from the starting edge 111, along... Figure 6 The coating is applied in the direction opposite to the first direction X, as shown.

[0056] Since the color filter material 130 is arranged cyclically from the starting edge 111, in the order of blue color filter material 130B, green color filter material 130G, to red color filter material 130R, the space left to form the first step T1 when coating the color filter material 130 in the order of red color filter material 130R, green color filter material 130G, to blue color filter material 130B is itself reserved for coating the blue color filter material 130B. Therefore, in implementing this embodiment, it is not necessary to adjust the layout of the pseudo color filter area 101 and the color filter area 102 on the substrate 110, but only to adjust the starting edge 111 corresponding to the coating process. Thus, process changes can be reduced, and consequently, the cost of changing the fabrication process of the filter can be reduced.

[0057] Furthermore, by ensuring that the distance between the nearest edge of the first-formed color filter material 130 (i.e., the red color filter material 130R) and the starting edge 111 is greater than or equal to 50 micrometers, the higher step formed by the previously formed color filter material 130 and the supporting substrate 120 can be converted into the first step T1 and the second step T2. Moreover, the distance between the nearest edge of the starting edge 111 and the starting edge 111 is greater than or equal to 50 micrometers, providing sufficient space to ensure that the color filter material 130 successively crosses the first step T1 and the second step T2. Therefore, when the color filter material 130 is formed after coating, it can be prevented from crossing the higher step formed by the color filter material 130 and the supporting substrate 120 in one go, thereby effectively preventing the color filter material 130 from tearing and cracking.

[0058] In some embodiments, Figure 7 This diagram illustrates the structure of the coating process at the spray nozzle 140. Figure 7 As shown, color film material 130 is coated on substrate 110 through spray nozzle 140. The spray nozzle 140 moves at a speed of 100 millimeters per second during coating.

[0059] Specifically, the spray nozzle 140 moves at a speed of 100 millimeters per second during coating, that is, it moves at a speed of 100 millimeters per second relative to the substrate 110 along the first direction X, starting from its starting edge 111.

[0060] Since the spray nozzle 140 typically moves at a speed of 200 mm per second during coating, and the liquid output from the spray nozzle 140 is constant, reducing the moving speed of the spray nozzle 140 during coating to 100 mm per second increases the amount of color film material 130 coated within the same area. This increases the thickness of the coated color film material 130, further preventing tearing and cracking of the color film material 130.

[0061] In some embodiments, such as Figure 7 As shown, a color filter material is coated on the substrate 110 through the spray nozzle 140. The distance between the spray nozzle 140 and the substrate 110 is 90 micrometers.

[0062] Since the distance between the spray nozzle 140 and the substrate 110 is generally 120 micrometers, and the liquid output from the spray nozzle 140 is constant, reducing the distance between the spray nozzle 140 and the substrate 110 to 90 micrometers can reduce the distance between the color filter material 130 coated on the substrate 110 and the spray nozzle 140. This reduces the stretching of the color filter material 130 coated on the substrate 110, increases the tensile redundancy of the color filter material 130 itself, and further prevents the color filter material 130 from tearing and cracking.

[0063] In some embodiments, after the color filter material 130 is coated, a first structure to be segmented 10 is formed. A top view of the first structure to be segmented 10 can be referenced. Figure 4 The cross-sectional view of the first structure 10 to be divided, as shown, can be referenced. Figure 5 The contents shown. After coating the color film material 130, it also includes:

[0064] The first structure 10 to be segmented is divided according to the difference between the pseudo-color filter region 101 and the color filter region 102, and the portion located in the pseudo-color filter region 101 is removed to obtain the second structure 20 to be segmented. That is... Figure 4 The portion of the first structure to be divided 10 shown in the diagram located in the color filter region 102 is the second structure to be divided 20. The second structure to be divided 20 is divided according to a preset size, and the substrate 110 is removed to obtain a filter plate.

[0065] Specifically, Figure 4 The matrix array arranged within the first structure to be divided 10 shown in the figure is the preset part that needs to be divided to form a single filter plate.

[0066] By following the steps described above, the tearing and cracking of the color filter material 130 can be effectively avoided when preparing high-thickness filter plates, thereby improving the yield rate of filter plate preparation and reducing the cost of mass production of filter plates.

[0067] In some embodiments, a complete cycle is defined as red color filter material 130R, green color filter material 130G, and blue color filter material 130B. All color filter materials 130 located in the color filter region 102 are considered complete cycles.

[0068] Since the color filter material 130 located in the color filter region 102 will eventually form the required filter plate, ensuring that the color filter material 130 located in the color filter region 102 is completely cycled can ensure that after the first segmented structure 10 is segmented according to the difference between the pseudo-color filter region 101 and the color filter region 102, there will be no incomplete cycle interfering with the segmentation and formation of the filter plate in the second segmented structure 20.

[0069] This application also provides a filter plate, which is formed using any of the above-described methods for preparing a filter plate.

[0070] This application also provides a display panel, including the aforementioned filter plate.

[0071] The display panel also includes a light-emitting layer. The side of the display panel that primarily emits light is the light-emitting side. The light filter is located on the side of the light-emitting layer facing the light-emitting side.

[0072] The above embodiments of this application can complement each other without causing conflict.

[0073] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0074] The term “multiple” means two or more, unless otherwise expressly defined.

[0075] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0076] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for preparing a color filter, characterized in that, include: Provide substrate; The substrate includes a starting edge, which is the edge where the coating process begins first on the substrate; the substrate also has a pseudo-color filter area and a color filter area, which are arranged alternately from the starting edge, and the first and last areas from the starting edge are both pseudo-color filter areas. A support carrier plate is disposed on the substrate, and the support carrier plate is located in the pseudo color filter area; the support carrier plate is used to support the coated color filter material. On the side of the substrate where the support carrier is located, at least three types of color filter materials are sequentially coated along the same coating direction; the distance between the edge of the first coated color filter material and the edge closest to the starting edge is greater than or equal to 50 micrometers.

2. The method for preparing the filter plate according to claim 1, characterized in that, The color filter material includes red color filter material, green color filter material and blue color filter material; the color filter material is formed in the order of red color filter material, green color filter material and blue color filter material; and the thickness of red color filter material, green color filter material and blue color filter material is greater than or equal to 0.2 micrometers and less than 1.4 micrometers.

3. The method for preparing the filter plate according to claim 2, characterized in that, The color filter material closest to the starting edge is the red color filter material; starting from the starting edge, the color filter materials are arranged cyclically in the order of the red color filter material, the green color filter material and the blue color filter material; The process of coating the color filter material also includes: When forming the red film material, the forming begins at a distance of 50 micrometers or more from the starting edge.

4. The method for preparing the filter plate according to claim 2, characterized in that, The color filter material closest to the starting edge is the blue color filter material; starting from the starting edge, the color filter materials are arranged cyclically in the order of the blue color filter material, the green color filter material and the red color filter material; The process of coating the color filter material also includes: When forming the red color film material, the formation begins at a distance of 100 micrometers or more from the starting edge.

5. The method for preparing the filter plate according to claim 4, characterized in that, A complete cycle is defined as the red color filter material, the green color filter material, and the blue color filter material; all color filter materials located in the color filter area constitute the complete cycle.

6. The method for preparing a filter plate according to claim 1, characterized in that, Color film material is applied to the substrate through a spray nozzle; the spray nozzle moves at a speed of 100 millimeters per second during the application process.

7. The method for preparing a filter plate according to claim 1, characterized in that, Color film material is applied to the substrate through a spray nozzle; the distance from the spray nozzle to the substrate is 90 micrometers.

8. The method for preparing a filter plate according to claim 1, characterized in that, After the color filter material is coated, the first structure to be segmented is formed; After coating the color filter material, the process also includes: The first structure to be segmented is divided according to the difference between the pseudo-color filter region and the color filter region, and the part located in the pseudo-color filter region is removed to obtain the second structure to be segmented. The second structure to be divided is divided according to a preset size, and the substrate is removed to obtain a filter plate.

9. A filter plate, characterized in that, It is formed using the method for preparing the filter plate according to any one of claims 1 to 8.

10. A display panel, characterized in that, Includes the filter plate as described in claim 9; The display panel further includes: a light-emitting layer; the side of the display panel that mainly emits light is the light-emitting side; the filter plate is located on the side of the light-emitting layer facing the light-emitting side.

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