Display substrate and its manufacturing method, display device

Abstract

This invention provides a display substrate, its manufacturing method, and a display device, belonging to the field of display technology. The display substrate includes a display area and low-voltage lines disposed around the display area. The low-voltage lines are used to provide negative voltage signals, and each low-voltage line includes at least two parallel sub-low-voltage lines, with an insulating layer separating adjacent sub-low-voltage lines. The technical solution of this invention can prevent the failure of the light-emitting material in the display device.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display substrate, its manufacturing method, and a display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) and QLED (Quantum Dot Light-Emitting Diodes) display devices have been listed as the next generation of display technologies with great development potential due to their advantages such as thinness, light weight, wide viewing angle, active light emission, continuously adjustable emission color, low cost, fast response speed, low power consumption, low driving voltage, wide operating temperature range, simple manufacturing process, high luminous efficiency, and flexible display.

[0003] With the iterative updates of new technologies and products, current display products have very high requirements for narrow bezels. To achieve extremely narrow bezels, the distance between the cutting line and the encapsulation adhesive coating area of ​​the display product needs to be reduced, and the encapsulation adhesive coating area itself also needs to be narrowed. Due to the reduced distance between the cutting line and the encapsulation adhesive coating area, some conventional cutting edge damage can damage the metal film layer of the encapsulation adhesive coating area, leading to encapsulation adhesive leakage and failure of the light-emitting material. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a display substrate and its manufacturing method, and a display device, which can avoid the failure of the light-emitting material of the display device.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide the following technical solutions:

[0006] On one hand, a display substrate is provided, including a display area and low voltage lines disposed around the display area, the low voltage lines being used to provide negative voltage signals, the low voltage lines including at least two parallel sub-low voltage lines, with an insulating layer spaced between adjacent sub-low voltage lines.

[0007] In some embodiments, the low-voltage line includes a first sub-low-voltage line and a second sub-low-voltage line that are parallel to each other.

[0008] In some embodiments, the first sub-low voltage line and the second sub-low voltage line are disposed in the same layer and made of the same material, and an insulating layer is separated between the first sub-low voltage line and the second sub-low voltage line.

[0009] In some embodiments, the shortest distance between the first sub-low voltage line and the second sub-low voltage line is greater than 5 μm.

[0010] In some embodiments, the first sub-low voltage line and the second sub-low voltage line are located on different layers, and an insulating layer separates the first sub-low voltage line and the second sub-low voltage line.

[0011] In some embodiments, the orthographic projection of the first sub-low voltage line on the substrate of the display substrate may or may not overlap with the orthographic projection of the second sub-low voltage line on the substrate.

[0012] In some embodiments, the sub-low voltage line includes multiple cutout areas.

[0013] An embodiment of the present invention provides a display device, including a display substrate as described above.

[0014] An embodiment of the present invention provides a method for manufacturing a display substrate, the display substrate including a display area, the manufacturing method including forming a low voltage line around the periphery of the display area, the low voltage line being used to provide a negative voltage signal, the low voltage line including at least two parallel sub-low voltage lines, and an insulating layer being spaced between adjacent sub-low voltage lines.

[0015] In some embodiments, forming the low-voltage line includes:

[0016] The first and second sub-low voltage lines are formed to be parallel to each other.

[0017] In some embodiments, forming the first and second sub-low voltage lines that are parallel to each other includes:

[0018] The first sub-low voltage line and the second sub-low voltage line are formed by a single patterning process. The shortest distance between the first sub-low voltage line and the second sub-low voltage line is greater than 5 μm. An insulating layer is separated between the first sub-low voltage line and the second sub-low voltage line.

[0019] In some embodiments, forming the first and second sub-low voltage lines that are parallel to each other includes:

[0020] Form the first sub-low voltage line;

[0021] An insulating layer is formed covering the first sub-low voltage line;

[0022] A second sub-low voltage line is formed on the insulating layer, and the orthographic projection of the second sub-low voltage line on the substrate of the display substrate may or may not overlap with the orthographic projection of the first sub-low voltage line on the substrate.

[0023] The embodiments of the present invention have the following beneficial effects:

[0024] In the above scheme, the low-voltage line consists of at least two parallel sub-low-voltage lines with an insulating layer between adjacent sub-low-voltage lines. The insulating layer can isolate adjacent sub-low-voltage lines. If the outer part of the encapsulation adhesive coating area where the low-voltage line is located is damaged during cutting, causing corrosion of the outer part of the sub-low-voltage line, the insulating layer between the sub-low-voltage lines can also prevent corrosion from proceeding inward, reducing the degree of corrosion. On the one hand, it ensures that the transmission of negative voltage signals is not affected, and on the other hand, it can improve the problem of encapsulation adhesive leakage, avoid the failure of the light-emitting material of the display device, and improve the product yield. Attached Figure Description

[0025] Figure 1 This is a planar schematic diagram of the display substrate;

[0026] Figure 2 This is a schematic diagram of the low-voltage lines in related technologies;

[0027] Figure 3 This is a schematic diagram of the cross-section of the low-voltage line in the AA direction in the related technology;

[0028] Figure 4 This is a schematic diagram of a low-voltage line according to an embodiment of the present invention;

[0029] Figure 5 and Figure 6 This is a schematic cross-sectional view of the low-voltage line in the BB direction according to an embodiment of the present invention.

[0030] Figure Labels

[0031] 01 Low Voltage Line

[0032] 02 Hollowed-out area

[0033] 03 First Sub-Low Voltage Line

[0034] 04 base

[0035] 05 Buffer Layer

[0036] 06, 07 insulation layers

[0037] 08 Second Sub-low Voltage Line Detailed Implementation

[0038] To make the technical problems, technical solutions and advantages of the embodiments of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, a low-voltage line 01 is provided around the display area (AA area) of the display substrate to provide a negative voltage signal. The low-voltage line 01 is located in the encapsulant-covered area. After the low-voltage line is made, encapsulant is applied to the encapsulant-covered area to encapsulate the display substrate.

[0040] like Figure 2 and Figure 3 As shown, the low voltage line 01 in the related technology has a single-line structure. Since the width of the encapsulant coating area is relatively narrow, the low voltage line 01 in the encapsulant coating area is easily damaged during cutting, which leads to corrosion of the low voltage line 01. This can cause the encapsulant to leak, the light-emitting material to fail, and also affect the transmission of negative voltage signals, resulting in a low yield of display products.

[0041] This invention provides a display substrate and its manufacturing method, as well as a display device, which can prevent the failure of the light-emitting material in the display device.

[0042] An embodiment of the present invention provides a display substrate, including a display area and low voltage lines disposed around the display area. The low voltage lines are used to provide negative voltage signals. The low voltage lines include at least two parallel sub-low voltage lines, and an insulating layer is spaced between adjacent sub-low voltage lines.

[0043] In this embodiment, the low-voltage line consists of at least two parallel sub-low-voltage lines with an insulating layer between adjacent sub-low-voltage lines. The insulating layer can isolate adjacent sub-low-voltage lines. If the outer part of the encapsulation adhesive coating area where the low-voltage line is located is damaged during cutting (i.e., the part away from the display area), causing corrosion of the sub-low-voltage line on the outer part, the insulating layer between the sub-low-voltage lines can also prevent corrosion from proceeding inward, reducing the degree of corrosion. On the one hand, this ensures that the transmission of the negative voltage signal is not affected, and on the other hand, it can improve the problem of encapsulation adhesive leakage, avoid the failure of the light-emitting material of the display device, and improve the product yield.

[0044] In this embodiment, the low-voltage line may include two parallel sub-low-voltage lines, three parallel sub-low-voltage lines, or even more parallel sub-low-voltage lines. However, for the sake of a narrow bezel, the low-voltage line should not include too many sub-low-voltage lines. In some embodiments, such as... Figure 4 As shown, the low voltage line includes a first sub-low voltage line 03 and a second sub-low voltage line 08 that are parallel to each other.

[0045] In this embodiment, after the low voltage line is fabricated, encapsulating adhesive is applied above the low voltage line. In order to enhance the adhesion between the encapsulating adhesive and the display substrate, the low voltage line may include multiple hollow areas 02. The shape of the hollow areas 02 may be square, circular, triangular, or irregular.

[0046] In some embodiments, such as Figure 6As shown, the first sub-low voltage line 03 and the second sub-low voltage line 08 can be disposed in the same layer and made of the same material. This allows the first sub-low voltage line 03 and the second sub-low voltage line 08 to be formed simultaneously in a single patterning process, simplifying the manufacturing process of the display substrate. To isolate the first sub-low voltage line 03 and the second sub-low voltage line 08, the shortest distance between them can be greater than 5 μm. An insulating layer 06 is placed between the first sub-low voltage line 03 and the second sub-low voltage line 08. This insulating layer 06 can be made of organic or inorganic insulating materials. The first sub-low voltage line 03 can be located on the side of the second sub-low voltage line away from the display area. If the first sub-low voltage line 03 is damaged during the cutting of the display substrate, causing corrosion of the outer side of the first sub-low voltage line 03, the insulating layer 06 between the sub-low voltage lines can prevent corrosion from proceeding inward, reducing the degree of corrosion and ensuring that the second sub-low voltage line 08 is not corroded. This ensures that the transmission of the negative voltage signal is not affected and also improves the problem of encapsulant leakage, preventing the failure of the light-emitting material of the display device and improving product yield.

[0047] In some embodiments, the first sub-low voltage line and the second sub-low voltage line are located on different layers, such as... Figure 5 As shown, an insulating layer 06 separates the first sub-low voltage line 03 from the second sub-low voltage line 08, meaning the first and second sub-low voltage lines are formed in two different film layers. This improves the isolation effect between the first and second sub-low voltage lines. The orthographic projections of the first and second sub-low voltage lines on the substrate of the display substrate may partially overlap, or they may not overlap. Preferably, the orthographic projection of the first sub-low voltage line on the substrate of the display substrate does not overlap with the orthographic projection of the second sub-low voltage line on the substrate. The first sub-low voltage line can be located on the side of the second sub-low voltage line away from the display area. If the first sub-low voltage line is damaged when the display substrate is cut, causing corrosion of the outer first sub-low voltage line, since the first sub-low voltage line and the second sub-low voltage line are located in different layers, the insulating layer between the sub-low voltage lines can also prevent corrosion from proceeding inward, reducing the degree of corrosion and ensuring that the second sub-low voltage line is not corroded. On the one hand, this ensures that the transmission of negative voltage signals is not affected, and on the other hand, it can improve the problem of leakage of encapsulant, avoid the failure of the light-emitting material of the display device, and improve the product yield.

[0048] An embodiment of the present invention provides a display device, including a display substrate as described above.

[0049] The display device includes, but is not limited to, components such as: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will understand that the above-described structure of the display device does not constitute a limitation on the display device; the display device may include more or fewer of the aforementioned components, or combine certain components, or arrange different components. In embodiments of the present invention, the display device includes, but is not limited to, a monitor, a mobile phone, a tablet computer, a television set, a wearable electronic device, a navigation display device, etc.

[0050] The display device can be any product or component with display function, such as a television, monitor, digital photo frame, mobile phone, or tablet computer. The display device further includes a flexible circuit board, a printed circuit board, and a backplane. In this embodiment, the display device can be an OLED display device or a QLED display device.

[0051] An embodiment of the present invention provides a method for manufacturing a display substrate, the display substrate including a display area, the manufacturing method including forming a low voltage line around the display area, the low voltage line being used to provide a negative voltage signal, the low voltage line including at least two parallel sub-low voltage lines, and an insulating layer being spaced between adjacent sub-low voltage lines.

[0052] In this embodiment, the low-voltage line consists of at least two parallel sub-low-voltage lines with an insulating layer between adjacent sub-low-voltage lines. The insulating layer can isolate adjacent sub-low-voltage lines. If the outer part of the encapsulation adhesive coating area where the low-voltage line is located is damaged during cutting, causing corrosion of the outer part of the sub-low-voltage line, the insulating layer between the sub-low-voltage lines can also prevent corrosion from proceeding inward, reducing the degree of corrosion. On the one hand, this ensures that the transmission of negative voltage signals is not affected, and on the other hand, it can improve the problem of encapsulation adhesive leakage, avoid the failure of the light-emitting material of the display device, and improve the product yield.

[0053] In this embodiment, the low-voltage line may include two parallel sub-low-voltage lines, three parallel sub-low-voltage lines, or more parallel sub-low-voltage lines. However, for the sake of a narrow bezel, the low-voltage line should not include too many sub-low-voltage lines. In some embodiments, forming the low-voltage line includes:

[0054] The first and second sub-low voltage lines are formed to be parallel to each other.

[0055] In some embodiments, forming the first and second sub-low voltage lines that are parallel to each other includes:

[0056] Forming the first and second sub-low voltage lines in a single patterning process simplifies the display substrate manufacturing process. The shortest distance between the first and second sub-low voltage lines is greater than 5µm, and an insulating layer, which can be made of either organic or inorganic insulating material, separates them. The first sub-low voltage line can be located on the side of the second sub-low voltage line furthest from the display area. If the first sub-low voltage line is damaged during display substrate cutting, causing corrosion on the outer side, the insulating layer between the sub-low voltage lines prevents corrosion from progressing inwards, reducing the degree of corrosion and ensuring the second sub-low voltage line remains uncorroded. This ensures uninterrupted transmission of negative voltage signals and mitigates encapsulation leakage, preventing luminescent material failure and improving product yield.

[0057] In some embodiments, the first sub-low voltage line and the second sub-low voltage line are located on different layers, and forming the first and second sub-low voltage lines that are parallel to each other includes:

[0058] A buffer layer 05 is formed on a substrate 04, wherein the substrate 04 may include a substrate, and the buffer layer 05 may be made of silicon nitride or silicon oxide.

[0059] The first sub-low voltage line 03 is formed on the buffer layer 05;

[0060] An insulating layer 06 is formed to cover the first sub-low voltage line 03;

[0061] A second sub-low voltage line 08 is formed on the insulating layer 06. The orthographic projection of the second sub-low voltage line on the substrate of the display substrate may or may not overlap with the orthographic projection of the first sub-low voltage line on the substrate.

[0062] An insulating layer 07 is formed to cover the second sub-low voltage line 08.

[0063] The insulating layer 06 can be made of organic or inorganic insulating materials, and the insulating layer 07 can also be made of organic or inorganic insulating materials. After forming the insulating layer 07 and completing the preparation of other film layers of the display substrate, encapsulating adhesive can be applied over the insulating layer 07 to encapsulate the display substrate. To enhance the adhesion between the encapsulating adhesive and the display substrate, the sub-low voltage line can include multiple hollow areas 02. The hollow areas 02 can be square, circular, triangular, or irregular in shape.

[0064] Preferably, the orthographic projection of the first sub-low voltage line on the substrate of the display substrate does not overlap with the orthographic projection of the second sub-low voltage line on the substrate, thus the distance between the first and second sub-low voltage lines is relatively large. The first sub-low voltage line can be located on the side of the second sub-low voltage line away from the display area. If the first sub-low voltage line is damaged during the cutting of the display substrate, causing corrosion of the outer first sub-low voltage line, the insulating layer between the first and second sub-low voltage lines can also prevent corrosion from proceeding inward, reducing the degree of corrosion and ensuring that the second sub-low voltage line is not corroded. This ensures that the transmission of negative voltage signals is not affected, improves the problem of encapsulant leakage, avoids the failure of the light-emitting material of the display device, and improves product yield.

[0065] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, since the embodiments are basically similar to the product embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the product embodiments.

[0066] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0067] It is understandable that when a component such as a layer, film, region, or substrate is referred to as being "above" or "below" another component, the component may be "directly" located "above" or "below" the other component, or there may be intermediate components present.

[0068] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0069] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display substrate, characterized by, The display substrate comprises a display area and a low-voltage line arranged at the periphery of the display area, the low-voltage line is used to provide a negative voltage signal, the low-voltage line comprises at least two mutually parallel sub-low-voltage lines, and an insulating layer is arranged between adjacent sub-low-voltage lines; wherein the low-voltage line comprises a first sub-low-voltage line and a second sub-low-voltage line which are mutually parallel; The first sub-low-voltage line and the second sub-low-voltage line are located at different layers, and the orthographic projection of the first sub-low-voltage line on a substrate of the display substrate does not overlap with the orthographic projection of the second sub-low-voltage line on the substrate; The low-voltage line is used for coating encapsulation glue, and the sub-low-voltage line comprises a plurality of hollow regions.

2. A display device, characterized by comprising: The display substrate comprises a display area and a low-voltage line arranged at the periphery of the display area, the low-voltage line is used to provide a negative voltage signal, the low-voltage line comprises at least two mutually parallel sub-low-voltage lines, and an insulating layer is arranged between adjacent sub-low-voltage lines; wherein the low-voltage line comprises a first sub-low-voltage line and a second sub-low-voltage line which are mutually parallel; 3. A method for manufacturing a display substrate, comprising: The first sub-low-voltage line and the second sub-low-voltage line are located at different layers, and the orthographic projection of the first sub-low-voltage line on a substrate of the display substrate does not overlap with the orthographic projection of the second sub-low-voltage line on the substrate; The low-voltage line is used for coating encapsulation glue, and the sub-low-voltage line comprises a plurality of hollow regions. ​ ​ ​

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