OLED display device manufacturing method and OLED display device

Abstract

An embodiment of the present invention discloses a method for manufacturing an OLED display device and an OLED display device. The method includes a first pixel-defining bank line forming step, a second pixel-defining bank line forming step, and a color ink printing step. The first pixel-defining bank line forming step includes forming a plurality of first pixel-defining bank lines along a first direction on a substrate. The second pixel-defining bank line forming step includes forming a plurality of second pixel-defining bank lines along a second direction on a substrate, and an overflow guide region is formed in each of the second pixel-defining bank lines. The present invention uses the overflow guide region to guide the overflow of color inks printed on the substrate in the color ink printing step, thereby preventing the problem of the overflowing color inks mixing with each other and affecting the quality of the OLED display device.

Description

[Technical Field]

[0001] The present invention relates to the technical field of display panels, and more particularly to a method for manufacturing an OLED display device and an OLED display device. [Background technology]

[0002] As the development of Organic Light Emitting Diode (OLED) technology becomes more mature, OLED display technology is now covering the medium- to large-sized display field. However, users' demands for display resolution are becoming higher and higher. White OLEDs are limited by technical limitations, such as the inability to address issues such as mask tension in medium- and large-sized displays, making it impossible to produce high-resolution products. Therefore, inkjet printing (IJP) technology is used to manufacture high-resolution medium- and large-sized OLED displays.

[0003] For IJP OLED technology, the bank layer on the substrate in an OLED display device is very important. In particular, line bank technology is the mainstream, and due to the fluidity of color ink, the line bank design can achieve very good OLED film thickness uniformity, and the requirement for precision in the printing process is low in the printing direction of color ink of the same color.

[0004] Please refer to Figure 1, which shows a conventional OLED display device including a substrate 90 and a pixel definition layer disposed on the substrate 90. The pixel definition layer includes a plurality of first bank lines 91 and a plurality of second bank lines 92 that intersect with each other, and the first bank lines 91 and the second bank lines 92 intersect with each other to define a plurality of sub-pixel light-emitting regions. In addition, the plurality of second bank lines 92 are hydrophobic, and can confine color inks printed on the OLED display device to the regions between adjacent second bank lines 92.

[0005] When a color ink printing program is executed on an OLED display device, red, blue, and green color inks R', G', and B' are printed in the areas between adjacent second bank lines 92 so that the color inks R', G', and B' are provided in each sub-pixel light-emitting area, respectively.

[0006] Referring to FIG. 2, a drawback of the above-described OLED display device is that when the second bank line 92 is damaged and broken, the color inks R', G', and B' located on both sides of the second bank line 92 overflow from one side to the other, causing the color inks R', G', and B' to mix with each other, preventing the associated sub-pixel light-emitting areas from corresponding to the correct color inks, ultimately resulting in defects in the OLED display device and reducing product yields. Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention provides a method for manufacturing an OLED display device and an OLED display device to solve the technical problem that, in a conventional OLED display device, the second bank line of the pixel definition layer is damaged or broken, causing color inks on both sides of the second bank line to overflow and mix with each other, preventing the associated sub-pixel light-emitting area from corresponding to the correct color ink, ultimately resulting in defects in the OLED display device and reducing product yield. [Means for solving the problem]

[0008] In one aspect, the present invention provides a method for producing a pharmaceutical composition comprising: a first pixel defining bank line forming step, which includes forming a plurality of first pixel defining bank lines along a first direction on a substrate, the plurality of first pixel defining bank lines being spaced apart from each other to form a first printing area between adjacent first pixel defining bank lines; a second pixel defining bank line forming step including forming a plurality of second pixel defining bank lines along a second direction on the substrate, wherein the plurality of second pixel defining bank lines form second print regions that intersect with the first print regions between adjacent second pixel defining bank lines that are spaced apart from each other, the plurality of second pixel defining bank lines being stacked on the plurality of first pixel defining bank lines so as to intersect with each other, and the first pixel defining bank lines and the second pixel defining bank lines defining a plurality of sub-pixel luminous regions arranged in a matrix, each of the sub-pixel luminous regions corresponding to one of the first print regions and one of the second print regions, and wherein an overflow guide region is formed within each of the second pixel defining bank lines; a color ink printing step, which includes printing and setting a plurality of color inks in the plurality of sub-pixel light-emitting areas, the plurality of color inks being located outside each of the overflow guide areas.

[0009] In some embodiments of the present invention, each of the second pixel defining bank lines includes at least two sub-bank lines that are parallel to and spaced apart from each other, and each of the overflow guide regions is formed between adjacent sub-bank lines.

[0010] In some embodiments of the present invention, in the color ink printing step, each of the plurality of color inks is line-shaped, perpendicular to the plurality of first printing areas, parallel to the plurality of second printing areas, provided in each of the plurality of second printing areas, and provided so as to intersect with the plurality of first printing areas.

[0011] In some embodiments of the present invention, the adjacent color inks are provided on both sides of the corresponding second pixel defining bank line.

[0012] In some embodiments of the present invention, the first direction and the second direction are perpendicular, the plurality of first printing areas and the plurality of second printing areas intersect perpendicularly, and the plurality of sub-pixel light-emitting areas are arranged in a matrix.

[0013] In another aspect, the present invention provides a method for producing a a plurality of first pixel defining bank lines formed on the substrate along a first direction, the plurality of first pixel defining bank lines being spaced apart from each other and forming first printing regions between adjacent first pixel defining bank lines; a plurality of second pixel defining bank lines formed on the substrate along a second direction, the plurality of second pixel defining bank lines forming second print regions that intersect with the first print regions between adjacent second pixel defining bank lines that are spaced apart from each other, the plurality of second pixel defining bank lines being stacked on the plurality of first pixel defining bank lines so as to intersect with each other, the plurality of second pixel defining bank lines defining a plurality of sub-pixel luminous regions that are arranged in a matrix by the first pixel defining bank lines and the second pixel defining bank lines, each of the sub-pixel luminous regions corresponding to one of the first print regions and one of the second print regions, and forming an overflow guide region within each of the second pixel defining bank lines; a plurality of color inks disposed within the plurality of sub-pixel light-emitting regions and positioned outside each of the overflow guide regions.

[0014] In some embodiments of the present invention, each of the second pixel defining bank lines includes at least two sub-bank lines that are parallel to and spaced apart from each other, and each of the overflow guide regions is formed between adjacent sub-bank lines.

[0015] In some embodiments of the present invention, each of the plurality of color inks is line-shaped, perpendicular to the plurality of first printing areas, parallel to the plurality of second printing areas, provided in each of the plurality of second printing areas, and provided so as to intersect with the plurality of first printing areas.

[0016] In some embodiments of the present invention, the adjacent color inks are provided on both sides of the corresponding second pixel defining bank line.

[0017] In some embodiments of the present invention, the first direction and the second direction are perpendicular, the plurality of first printing areas and the plurality of second printing areas intersect perpendicularly, and the plurality of sub-pixel light-emitting areas are arranged in a matrix.

[0018] In another aspect, the present invention provides a method for producing a a plurality of first pixel defining bank lines formed on the substrate along a first direction, the plurality of first pixel defining bank lines being spaced apart from each other and forming first printing regions between adjacent first pixel defining bank lines; a plurality of second pixel defining bank lines formed on the substrate along a second direction, the plurality of second pixel defining bank lines forming second print regions that intersect with the first print regions between adjacent second pixel defining bank lines that are spaced apart from each other, the plurality of second pixel defining bank lines being stacked on the plurality of first pixel defining bank lines so as to intersect with each other, the plurality of second pixel defining bank lines defining a plurality of sub-pixel luminous regions that are arranged in a matrix by the first pixel defining bank lines and the second pixel defining bank lines, each of the sub-pixel luminous regions corresponding to one of the first print regions and one of the second print regions, and forming an overflow guide region within each of the second pixel defining bank lines; a plurality of color inks provided within the plurality of sub-pixel light-emitting regions and positioned outside each of the overflow guide regions, each of the second pixel defining bank lines includes at least two sub-bank lines that are parallel to and spaced apart from each other, and each of the overflow guide regions is formed between adjacent sub-bank lines; An OLED display device is provided in which each of the plurality of color inks is in the form of a line, perpendicular to the plurality of first printing areas, parallel to the plurality of second printing areas, and provided in each of the plurality of second printing areas so as to intersect with the plurality of first printing areas.

[0019] In some embodiments of the present invention, the adjacent color inks are provided on both sides of the corresponding second pixel defining bank line.

[0020] In some embodiments of the present invention, the first direction and the second direction are perpendicular, the plurality of first printing areas and the plurality of second printing areas intersect perpendicularly, and the plurality of sub-pixel light-emitting areas are arranged in a matrix. [Effects of the Invention]

[0021] The present invention has at least the following advantages: The OLED display device and the manufacturing method thereof according to the present invention include a substrate on which a plurality of first pixel-defining bank lines and a plurality of second pixel-defining bank lines are formed, each of the second pixel-defining bank lines having an overflow guide region, and color inks being provided between adjacent second pixel-defining bank lines. When one side of a second pixel-defining bank line is damaged, color inks located on the damaged side of the second pixel-defining bank line flow into the overflow guide region of the second pixel-defining bank line, and the overflowing color inks are limited by the overflow guide region to prevent them from overflowing into adjacent color inks. This solves the technical problem in the conventional OLED display device in that the overflowing color inks cause color mixing, which prevents related sub-pixel light-emitting regions from corresponding to the correct color inks, ultimately resulting in defects in the OLED display device and reduced product yield. [Brief explanation of the drawings]

[0022] In order to more clearly describe the technical means in the embodiments of the present invention, the following briefly introduces the drawings that need to be used in the description of the embodiments. The drawings in the following description are only some embodiments of the present invention, and it is obvious that those skilled in the art can derive other drawings from these drawings without any creative efforts. [Figure 1] FIG. 1 is a plan view of a prior art OLED display device. [Figure 2] FIG. 2 is another plan view of a prior art OLED display device, in which the second bank line is damaged, causing color ink on one side of the second bank line to overflow to the other side and mix with other color ink. [Figure 3] FIG. 3 is a flowchart illustrating steps of a method for manufacturing an OLED display device according to an embodiment of the present invention. [Figure 4] FIG. 4 is a plan view of an OLED display device according to an embodiment of the present invention, in which color inks are omitted. [Figure 5] FIG. 5 is another plan view of an OLED display device according to an embodiment of the present invention. [Figure 6] FIG. 6 is another plan view of an OLED display device according to an embodiment of the present invention, in which one side of a second pixel-defining bank line is damaged, causing color ink on one side to flow into the overflow guide region of the second pixel-defining bank line through the damaged side. [Figure 7] FIG. 7 is a plan view of a second pixel-defining bank line of an OLED display device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] The technical means in the embodiments of the present invention will be described below clearly and completely with reference to the drawings in the embodiments of the present invention, but it is clear that the described embodiments are not all of the embodiments of the present invention, but only a part of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0024] In order to solve the technical problem that the second bank lines of the pixel definition layer in the conventional OLED display device are damaged and broken, the R, G, and B color inks on both sides of the second bank lines overflow and mix with each other, preventing the associated sub-pixel light-emitting area P from corresponding to the correct R, G, and B color inks, ultimately resulting in defects in the OLED display device and reducing the product yield, the embodiments of the present invention provide a method for manufacturing an OLED display device and an OLED display device.

[0025] Each of these will be described in detail below. Note that the order in which the following embodiments are described does not limit the preferred order of the embodiments.

[0026] Referring to FIGS. 3 to 6, the present invention provides a method for manufacturing an OLED display device, which includes a step S01 of forming a first pixel-defining bank line, a step S02 of forming a second pixel-defining bank line, and a step S03 of printing color inks.

[0027] The first pixel definition bank line forming step S01 includes forming a plurality of first pixel definition bank lines 30 along a first direction (e.g., a vertical direction) on the substrate 10, and forming a first printing area 300 between adjacent first pixel definition bank lines 30 that are spaced apart from each other.

[0028] The second pixel defining bank line forming step S02 includes forming a plurality of second pixel defining bank lines 50 along a second direction (e.g., horizontal direction) on the substrate 10, forming second print regions 500 that intersect with the first print regions 300 between adjacent second pixel defining bank lines 50 that are spaced apart from each other, and stacking the second pixel defining bank lines 50 crossing each other on the first pixel defining bank lines 30 to define a plurality of sub-pixel light-emitting regions P arranged in a matrix by the first pixel defining bank lines 30 and the second pixel defining bank lines 50, each of the sub-pixel light-emitting regions P corresponding to one of the first print regions 300 and one of the second print regions 500, and forming an overflow guide region 510 within each of the second pixel defining bank lines 50. Specifically, the overflow guide region 510 is a hollow space for accommodating overflowing color inks R, G, and B.

[0029] The color ink printing step S03 includes printing and setting a plurality of color inks R, G, and B in the plurality of sub-pixel light-emitting regions P, and the plurality of color inks R, G, and B are positioned outside the respective overflow guide regions. Specifically, the color inks R, G, and B may be red, blue, and green color inks R, G, and B, and may be water-based inks or inks that are hydrophobic and / or oil-repellent.

[0030] Specifically, the substrate 10 includes a base substrate, a thin film transistor (TFT) layer, an electrode layer, and a pixel definition layer. The TFT layer includes a gate metal layer formed on the base substrate 11, a gate insulating layer covering the base substrate and the gate metal layer, a source / drain metal layer positioned on the gate insulating layer, and an interlayer insulating layer covering the source / drain metal layer and the gate insulating layer. The electrode layer is formed on the interlayer insulating layer and electrically connected to the source / drain metal layer. The pixel definition layer includes the first pixel definition bank line 30 and the second pixel definition bank line 50. The specific configuration and function of the substrate 10 are well known in the art and will not be described in detail herein.

[0031] In some embodiments of the present invention, each of the second pixel defining bank lines 50 includes at least two sub-bank lines 51 that are parallel to and spaced apart from each other, and each of the overflow guide regions 510 is formed between adjacent sub-bank lines 51.

[0032] In some other embodiments of the present invention, each of the second pixel defining bank lines 50a has a single bank line structure, but the overflow guide region 510a is an enclosed space formed in the second pixel defining bank line 50a, as shown in FIG. 7.

[0033] In some embodiments of the present invention, in the color ink printing step S03, each of the multiple color inks R, G, B is linear, perpendicular to the multiple first printing areas 300, parallel to the multiple second printing areas 500, and is provided in each of the multiple second printing areas 500 and intersects with the multiple first printing areas 300.

[0034] In some embodiments of the present invention, adjacent color inks R, G, B are provided on either side of the corresponding second pixel defining bank line 50 .

[0035] In some embodiments of the present invention, the first direction and the second direction are perpendicular, the plurality of first printing areas 300 and the plurality of second printing areas 500 intersect perpendicularly, and the plurality of sub-pixel light-emitting areas P are arranged in a matrix.

[0036] Referring to FIGS. 4 to 6, in another aspect, the present invention provides an OLED display device including a plurality of first pixel defining bank lines 30, a second pixel defining bank line 50, and a plurality of color inks R, G, and B.

[0037] A plurality of first pixel defining bank lines 30 are formed on the substrate 10 along a first direction, and a first printing region 300 is formed between adjacent first pixel defining bank lines 30 that are spaced apart from each other.

[0038] The second pixel defining bank lines 50 are formed along the second direction on the substrate 10, and second print regions 500 that intersect with the first print regions 300 are formed between adjacent, spaced-apart second pixel defining bank lines 50. The second pixel defining bank lines 50 are stacked on the first pixel defining bank lines 30, crossing each other, to define a plurality of sub-pixel light-emitting regions P arranged in a matrix by the first pixel defining bank lines 30 and the second pixel defining bank lines 50. Each sub-pixel light-emitting region P corresponds to one first print region 300 and one second print region 500, and an overflow guide region 510 is formed within each second pixel defining bank line 50. Specifically, the overflow guide region 510 is a hollow space for accommodating overflowing color inks R, G, and B.

[0039] A plurality of color inks R, G, and B are provided in the plurality of sub-pixel light-emitting regions P and are located outside the respective overflow guide regions 510. Specifically, the color inks R, G, and B may be red, blue, and green color inks R, G, and B, and may be water-based inks or inks that are hydrophobic and / or oil-repellent.

[0040] Specifically, the substrate 10 includes a base substrate, a thin film transistor (TFT) layer, an electrode layer, and a pixel definition layer. The TFT layer includes a gate metal layer formed on the base substrate 11, a gate insulating layer covering the base substrate and the gate metal layer, a source / drain metal layer positioned on the gate insulating layer, and an interlayer insulating layer covering the source / drain metal layer and the gate insulating layer. The electrode layer is formed on the interlayer insulating layer and electrically connected to the source / drain metal layer. The pixel definition layer includes the first pixel definition bank line 30 and the second pixel definition bank line 50. The specific configuration and function of the substrate 10 are well known in the art and will not be described in detail herein.

[0041] In some embodiments of the present invention, each of the second pixel defining bank lines 50 includes at least two sub-bank lines 51 that are parallel to and spaced apart from each other, and each of the overflow guide regions 510 is formed between adjacent sub-bank lines 51.

[0042] In some other embodiments of the present invention, each of the second pixel defining bank lines 50a has a single bank line structure, but the overflow guide region 510a is an enclosed space formed in the second pixel defining bank line 50a, as shown in FIG. 7.

[0043] In some embodiments of the present invention, each of the plurality of color inks R, G, B is linear, perpendicular to the plurality of first printing areas 300, parallel to the plurality of second printing areas 500, and is provided in each of the plurality of second printing areas 500 and intersects with the plurality of first printing areas 300.

[0044] In some embodiments of the present invention, adjacent color inks R, G, B are provided on either side of the corresponding second pixel defining bank line 50 .

[0045] In some embodiments of the present invention, the first direction and the second direction are perpendicular, the plurality of first printing areas 300 and the plurality of second printing areas 500 intersect perpendicularly, and the plurality of sub-pixel light-emitting areas are arranged in a matrix.

[0046] The OLED display device and manufacturing method according to the present invention include a substrate 10 on which a plurality of first pixel-defining bank lines 30 and a plurality of second pixel-defining bank lines 50 are provided. An overflow guide region 510 is formed in each of the second pixel-defining bank lines 50, and color inks R, G, and B are provided between adjacent second pixel-defining bank lines 50. When one side of a second pixel-defining bank line 50 is damaged, the color inks R, G, and B located on the damaged side of the second pixel-defining bank line 50 flow into the overflow guide region 510 of the second pixel-defining bank line 50 and are restricted by the overflow guide region 510, preventing the overflowing color inks R, G, and B from overflowing into adjacent color inks. This solves the technical problem in the prior art OLED display device in which the overflowing color inks R, G, and B cause color mixing, preventing the associated subpixel light-emitting regions from correctly corresponding to the color inks R, G, and B, ultimately resulting in defects in the OLED display device and reduced product yield.

[0047] The method for manufacturing an OLED display device and an OLED display device according to embodiments of the present invention have been described in detail above. Although the present specification has used specific examples to explain the principles and embodiments of the present invention, the explanation of the above examples is merely for understanding the method of the present invention and its core idea. Meanwhile, a person skilled in the art may make changes to the specific embodiments and application scope based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. a first pixel defining bank line forming step, which includes forming a plurality of first pixel defining bank lines along a first direction on a substrate, the plurality of first pixel defining bank lines being spaced apart from each other to form a first printing area between adjacent first pixel defining bank lines; a second pixel defining bank line forming step including forming a plurality of second pixel defining bank lines along a second direction on the substrate, wherein the plurality of second pixel defining bank lines form second print regions between adjacent second pixel defining bank lines that are spaced apart from each other, the second pixel defining bank lines being stacked on the plurality of first pixel defining bank lines to cross each other, and the first pixel defining bank lines and the second pixel defining bank lines defining a plurality of sub-pixel luminous regions arranged in a matrix by the first pixel defining bank lines and the second pixel defining bank lines, each of the sub-pixel luminous regions corresponding to one of the first print regions and one of the second print regions; and a second pixel defining bank line forming step forming an overflow guide region within each of the second pixel defining bank lines. a color ink printing step including printing and setting a plurality of color inks in the plurality of sub-pixel light-emitting areas, the plurality of color inks being positioned outside each of the overflow guide areas; each of the second pixel defining bank lines has a closed single bank line structure formed individually and integrally, and each of the overflow guide regions is a sealed space formed in the second pixel defining bank line.

2. 2. The method for manufacturing an OLED display device according to claim 1, wherein in the color ink printing step, each of the plurality of color inks is linear, perpendicular to the plurality of first printing areas, parallel to the plurality of second printing areas, and provided in each of the plurality of second printing areas so as to intersect with the plurality of first printing areas.

3. 3. The method of claim 2, wherein the adjacent color inks are provided on both sides of the corresponding second pixel defining bank line.

4. 2. The method for manufacturing an OLED display device according to claim 1, wherein the first direction and the second direction are perpendicular to each other, the plurality of first printing regions and the plurality of second printing regions intersect perpendicularly, and the plurality of sub-pixel light-emitting regions are arranged in a matrix.

5. a plurality of first pixel defining bank lines formed on the substrate along a first direction, the plurality of first pixel defining bank lines being spaced apart from each other and forming first printing areas between adjacent first pixel defining bank lines; a plurality of second pixel defining bank lines formed on the substrate along a second direction, the plurality of second pixel defining bank lines forming second print regions between adjacent second pixel defining bank lines that are spaced apart from each other, the plurality of second pixel defining bank lines being stacked on the plurality of first pixel defining bank lines so as to cross each other, the plurality of second pixel defining bank lines defining a plurality of sub-pixel luminous regions arranged in a matrix by the first pixel defining bank lines and the second pixel defining bank lines, each of the sub-pixel luminous regions corresponding to one of the first print regions and one of the second print regions, and forming an overflow guide region within each of the second pixel defining bank lines; a plurality of color inks provided within the plurality of sub-pixel light-emitting regions and positioned outside each of the overflow guide regions, each of the second pixel-defining bank lines has a closed single bank line structure formed individually and integrally, and each of the overflow guide regions is a sealed space formed in the second pixel-defining bank line.

6. 6. The OLED display device according to claim 5, wherein each of the plurality of color inks is linear, perpendicular to the plurality of first printing areas, parallel to the plurality of second printing areas, and provided in each of the plurality of second printing areas so as to intersect with the plurality of first printing areas.

7. The adjacent color inks are provided on both sides of the corresponding second pixel defining bank line.

7. The OLED display device of claim 6.

8. 6. The OLED display device according to claim 5, wherein the first direction and the second direction are perpendicular to each other, the plurality of first printing regions and the plurality of second printing regions intersect perpendicularly, and the plurality of sub-pixel light-emitting regions are arranged in a matrix.

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