阅读说明：本技术 一种发光基板及其制备方法、测试方法、显示装置 (Light-emitting substrate, preparation method and test method thereof, and display device ) 是由 贾明明 冯莎 汪楚航 王莉莉 王静 刘超 翟明 于 2021-08-16 设计创作，主要内容包括：本申请公开了一种发光基板及其制备方法、测试方法、显示装置,用以提高断路检测准确度和灵敏度。发光基板包括：衬底基板,衬底基板正面具有显示区以及周边区,衬底基板背面具有扇出区；多条信号线,在衬底基板的正面从显示区延伸到周边区；多条扇出线,位于所扇出区；多条连接引线,从周边区经过衬底基板的侧面延伸至扇出区；多条连接引线中的每一连接引线的一端与信号线电连接,多条连接引线中的每一连接引线的另一端与扇出线电连接；第一绝缘层,覆盖连接引线表面；检测电极,在周边区位于第一绝缘层背离连接引线的一侧；在周边区,检测电极在衬底基板的正投影与多条连接引线在衬底基板的正投影具有交叠,检测电极与多条连接引线形成电容。(The application discloses a light-emitting substrate, a preparation method thereof, a testing method thereof and a display device, which are used for improving the accuracy and the sensitivity of open circuit detection. The light emitting substrate includes: the front surface of the substrate base plate is provided with a display area and a peripheral area, and the back surface of the substrate base plate is provided with a fan-out area; a plurality of signal lines extending from the display region to the peripheral region on the front surface of the substrate base plate; the fan-out lines are positioned in the fan-out area; a plurality of connecting leads extending from the peripheral region to the fan-out region through the side surface of the substrate base plate; one end of each connecting lead in the connecting leads is electrically connected with the signal wire, and the other end of each connecting lead in the connecting leads is electrically connected with the fanout wire; a first insulating layer covering the surface of the connection lead; the detection electrode is positioned on one side, away from the connecting lead, of the first insulating layer in the peripheral area; in the peripheral area, the orthographic projection of the detection electrode on the substrate base plate and the orthographic projection of the plurality of connecting leads on the substrate base plate are overlapped, and the detection electrode and the plurality of connecting leads form a capacitor.)

1. A light-emitting substrate, comprising:

the front surface of the substrate base plate is provided with a display area and a peripheral area outside the display area, and the back surface of the substrate base plate is provided with a fan-out area;

a plurality of signal lines extending from the display region to the peripheral region on the front surface of the substrate base plate;

the fan-out lines are positioned in the fan-out area;

a plurality of connecting leads extending from the peripheral region to the fan-out region through a side surface of the substrate base plate; one end of each connecting lead wire in the plurality of connecting lead wires is electrically connected with the signal wire, and the other end of each connecting lead wire in the plurality of connecting lead wires is electrically connected with the fanout wire;

the first insulating layer covers the surface of the connecting lead;

the detection electrode is positioned on one side, away from the connecting lead, of the first insulating layer in the peripheral area; in the peripheral area, the orthographic projection of the detection electrode on the substrate base plate and the orthographic projection of the plurality of connecting leads on the substrate base plate have overlapping, and the detection electrode and the plurality of connecting leads form capacitance.

2. The light-emitting substrate according to claim 1, wherein the plurality of connecting leads are arranged along a first direction, and the detecting electrode is a strip electrode extending along the first direction.

3. The light-emitting substrate according to claim 2, wherein the width of the stripe-shaped electrodes is greater than or equal to 100 micrometers and less than or equal to 200 micrometers.

4. The light-emitting substrate according to any one of claims 1 to 3, wherein the material of the detection electrode comprises one or a combination of the following materials: copper-titanium alloy and aluminum-molybdenum alloy.

5. The light-emitting substrate according to any one of claims 1 to 3, wherein a thickness of the first insulating layer is 0.6 μm or more and 1 μm or less.

6. A method of fabricating a light-emitting substrate, the method comprising:

providing a substrate base plate; the front surface of the substrate base plate is provided with a display area and a peripheral area outside the display area; the back surface of the substrate base plate is provided with a fan-out area;

forming a plurality of signal line patterns on the front surface of the substrate base plate; the signal lines extend from the display area to the peripheral area;

forming a plurality of fan-out line patterns in the fan-out area;

forming a pattern of a plurality of connecting leads; the plurality of connecting leads extend from the peripheral area to the fan-out area through the side face of the substrate base plate, one end of each connecting lead in the plurality of connecting leads is electrically connected with the signal line, and the other end of each connecting lead in the plurality of connecting leads is electrically connected with the fan-out line;

forming a first insulating layer covering the surface of the connecting lead;

forming a pattern of detection electrodes on one side of the first insulating layer of the peripheral area, which is away from the connecting leads; in the peripheral area, the orthographic projection of the detection electrode on the substrate base plate has overlap with the orthographic projection of the plurality of connecting leads on the substrate base plate.

7. The method of claim 6, wherein prior to forming the first insulating layer covering the surface of the connecting lead, the method further comprises:

and in the area outside the connecting lead, attaching first protective films to one side of the signal wire, which is far away from the substrate base plate, and one side of the fanout wire, which is far away from the substrate base plate.

8. The method of claim 7, wherein after forming a first insulating layer on the surface of the connection lead, the method further comprises:

tearing off the first protective film on one side of the fanout line, which is far away from the substrate base plate;

attaching a second protective film covering the fan-out wire and the first insulating layer to one side of the fan-out wire, which is far away from the substrate; the second protective film extends to the peripheral area and covers the first insulating layer outside the detection electrode setting area.

9. The method of claim 8, wherein after patterning detection electrodes on a side of the first insulating layer of the peripheral region facing away from the connection leads, the method further comprises:

tearing off the first protective film and the second protective film;

and attaching a third protective film to one side of the signal line, which is far away from the substrate base plate.

10. The method according to any one of claims 6 to 9, wherein the forming of the pattern of the detection electrode on the side of the first insulating layer of the peripheral area facing away from the connection lead includes:

forming strip-shaped electrodes extending along a first direction on one side, away from the connecting leads, of the first insulating layer in the peripheral area; wherein the first direction is an arrangement direction of the plurality of connection leads.

11. A method of inspecting a luminescent substrate according to any one of claims 1 to 5, wherein the method comprises:

and determining whether the connection lead has an open circuit according to a signal of the capacitance formed between the detection electrode and the connection lead.

12. The method of claim 11, wherein determining whether there is an open circuit in the connection lead based on a signal indicative of a capacitance formed between the sensing electrode and the connection lead comprises:

and contacting the fanout wire with a signal loading probe of a lower platform of the detection jig, contacting the detection electrode with a signal receiving probe of an upper platform of the detection jig, and determining whether the connection lead is broken according to a signal received by the signal receiving probe.

13. A display device, comprising: a light-emitting substrate according to any one of claims 1 to 5.

Technical Field

The application relates to the technical field of display, in particular to a light-emitting substrate, a preparation method, a test method and a display device thereof.

Background

At present, a Mini inorganic light emitting diode (Mini LED) display product is a large-size product spliced by a plurality of small panels (panel), and the small panel is required to be designed with a narrow frame in order to ensure a small enough splicing seam.

To achieve a narrow border design, area is saved by designing the binding area on the back of the panel. The front and back wiring conduction is realized by manufacturing side leads at the edge of the glass substrate. Therefore, if there is an open circuit in the side lead, it will directly cause display abnormality. Therefore, the open circuit detection of the side lead is required to determine the conduction state of the side trace. Because there is no space specially designed test point in the front of the panel, in order to avoid the damage to the panel wiring, the present open circuit detection adopts non-contact inspection in the front of the panel. The principle is that the back bonding area loads an alternating current signal through a probe, and the front testing area enables a capacitor to be formed between an induction electrode of the detection jig and a side lead and senses the alternating current signal. By setting the upper and lower limits of the waveform signal, a signal that is not within this range can be determined to be in an open circuit state. However, since the sensing electrode is designed on the testing fixture, the distance between the sensing electrode and the panel during testing affects the sensitivity and accuracy of the measured signal.

Disclosure of Invention

The embodiment of the application provides a light-emitting substrate, a preparation method thereof, a testing method thereof and a display device, which are used for improving the accuracy and the sensitivity of open circuit detection.

The embodiment of this application provides a luminescent substrate, luminescent substrate includes:

the front surface of the substrate base plate is provided with a display area and a peripheral area outside the display area, and the back surface of the substrate base plate is provided with a fan-out area;

a plurality of signal lines extending from the display region to the peripheral region on the front surface of the substrate base plate;

the fan-out lines are positioned in the fan-out area;

a plurality of connecting leads extending from the peripheral region to the fan-out region through the side surface of the substrate base plate; one end of each connecting lead in the connecting leads is electrically connected with the signal wire, and the other end of each connecting lead in the connecting leads is electrically connected with the fanout wire;

a first insulating layer covering the surface of the connection lead;

the detection electrode is positioned on one side, away from the connecting lead, of the first insulating layer in the peripheral area; in the peripheral area, the orthographic projection of the detection electrode on the substrate base plate and the orthographic projection of the plurality of connecting leads on the substrate base plate are overlapped, and the detection electrode and the plurality of connecting leads form a capacitor.

In some embodiments, the plurality of connection leads are arranged along a first direction, and the detection electrode is a strip electrode extending along the first direction.

In some embodiments, the width of the stripe electrode is greater than or equal to 100 micrometers and less than or equal to 200 micrometers.

In some embodiments, the material of the detection electrode comprises one or a combination of: copper-titanium alloy and aluminum-molybdenum alloy.

In some embodiments, the thickness of the first insulating layer is 0.6 microns or more and 1 micron or less.

The preparation method of the light-emitting substrate provided by the embodiment of the application comprises the following steps:

providing a substrate base plate; the front surface of the substrate base plate is provided with a display area and a peripheral area outside the display area; the back surface of the substrate base plate is provided with a fan-out area;

forming a plurality of signal line patterns on the front surface of the substrate base plate; the signal lines extend from the display area to the peripheral area;

forming a plurality of fan-out line patterns in the fan-out area;

forming a pattern of a plurality of connecting leads; the plurality of connecting leads extend to the fan-out area from the peripheral area through the side face of the substrate, one end of each connecting lead in the plurality of connecting leads is electrically connected with the signal wire, and the other end of each connecting lead in the plurality of connecting leads is electrically connected with the fan-out wire;

forming a first insulating layer covering the surface of the connecting lead;

forming a pattern of detection electrodes on one side of the first insulating layer in the peripheral area, which is far away from the connecting lead; in the peripheral area, the orthographic projection of the detection electrode on the substrate base plate and the orthographic projection of the plurality of connecting leads on the substrate base plate have overlapping.

In some embodiments, before forming the first insulating layer covering the surface of the connection lead, the method further comprises:

and in the region outside the connecting lead, a first protective film is respectively attached to one side of the signal wire, which is far away from the substrate base plate, and one side of the fan-out wire, which is far away from the substrate base plate.

In some embodiments, after forming the first insulating layer on the surface of the connection lead, the method further includes:

tearing off the first protective film on one side of the fanout line, which is far away from the substrate;

attaching a second protective film covering the fan-out wire and the first insulating layer to one side of the fan-out wire, which is far away from the substrate; the second protective film extends to the peripheral area and covers the first insulating layer outside the detection electrode arrangement area.

In some embodiments, after patterning the detection electrodes on a side of the first insulating layer of the peripheral region facing away from the connection leads, the method further comprises:

tearing off the first protective film and the second protective film;

and attaching a third protective film to the side of the signal line, which is far away from the substrate base plate.

In some embodiments, the forming of the pattern of the detection electrode on the side of the first insulating layer in the peripheral region, which faces away from the connection lead, specifically includes:

forming strip-shaped electrodes extending along a first direction on one side, away from the connecting leads, of the first insulating layer in the peripheral area; the first direction is the arrangement direction of the connecting leads.

The detection method for the light-emitting substrate provided by the embodiment of the application comprises the following steps:

and determining whether there is an open circuit in the connection lead based on a signal of the capacitance formed between the detection electrode and the connection lead.

In some embodiments, determining whether there is an open circuit in the connection lead based on a signal of a capacitance formed between the detection electrode and the connection lead includes:

and (3) contacting the fanout wire with a signal loading probe of the lower platform of the detection jig, contacting the detection electrode with a signal receiving probe of the upper platform of the detection jig, and determining whether the connection lead is broken according to a signal received by the signal receiving probe.

An embodiment of the present application provides a display device, including: according to the luminous base plate that this application embodiment provided.

In summary, according to the light emitting substrate, the manufacturing method thereof, the detection method thereof and the display device provided by the embodiment of the application, the first insulating layer covers the surface of the connecting lead, and the detection electrode is formed on one side of the first insulating layer away from the connecting lead, so that the detection electrode and the plurality of connecting leads form a capacitor structure, and the first insulating layer is equivalent to a dielectric layer of a capacitor. Can be integrated on luminescent substrate with the detection electrode that the lead wire forms the electric capacity like this for the positive opposite area between the capacitance electrode and the distance between the capacitance electrode are fixed, thereby the capacitance of the capacitance structure that detection electrode and many lead wires formed is more stable, can improve the accuracy and the sensitivity that the lead wire that connects broken circuit detected. In addition, the first insulating layer covers the surface of the connecting lead, so that the connecting lead can be protected, and the connecting lead is prevented from being damaged in the manufacturing process of the detection electrode.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a light-emitting substrate according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a short circuit detection performed on a light-emitting substrate in a non-contact manner according to the related art;

fig. 3 is a schematic structural diagram of another light-emitting substrate provided in this embodiment of the present application;

fig. 4 is a schematic structural diagram of another light-emitting substrate provided in this embodiment of the present application;

fig. 5 is a schematic flow chart illustrating a method for manufacturing a light-emitting substrate according to an embodiment of the present disclosure;

fig. 6 is a schematic flow chart illustrating another method for manufacturing a light-emitting substrate according to an embodiment of the present disclosure;

fig. 7 is a schematic view illustrating a method for detecting a light-emitting substrate according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings of the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present disclosure. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

An embodiment of the present application provides a light emitting substrate provided in an embodiment of the present application, as shown in fig. 1, the light emitting substrate includes:

the display panel comprises a substrate base plate 1, wherein the front surface of the substrate base plate 1 is provided with a display area 11 and a peripheral area 12 outside the display area 11, and the back surface of the substrate base plate 1 is provided with a fan-out area 13;

a plurality of signal lines 2 extending from the display region 11 to the peripheral region 12 on the front surface of the base substrate 1;

a plurality of fan-out lines 3 located in the fan-out area 13;

a plurality of connecting leads 4 extending from the peripheral region 12 to the fan-out region 13 through the side surface of the substrate base plate 1; one end of each connecting lead 4 in the connecting leads 4 is electrically connected with the signal wire 2, and the other end of each connecting lead 4 in the connecting leads 4 is electrically connected with the fanout wire 3;

a first insulating layer 5 covering the surface of the connection lead 4;

a detection electrode 6 on a side of the first insulating layer 5 facing away from the connection lead 4 in the peripheral region 12; in the peripheral area 12, an orthogonal projection of the detection electrode 6 on the substrate 1 and an orthogonal projection of the plurality of connection leads 4 on the substrate 1 have an overlap, and the detection electrode 6 and the plurality of connection leads 4 form a capacitor.

The front surface and the back surface of the base substrate are two opposite surfaces of the base substrate, respectively.

In the light-emitting substrate provided in the embodiment of the present application, the connection leads may be subjected to disconnection detection by using the capacitance formed by the detection electrode and the plurality of connection leads, that is, whether the connection leads are disconnected or not may be determined according to the capacitance.

It should be noted that S represents the relative area of the two parallel metal layers, d represents the distance between the two parallel metal layers, the two parallel metal layers are filled with a dielectric with a relative dielectric epsilon, and the capacitance C of the parallel metal layers satisfies the following formula: and C is epsilon S/d. In the related art, short circuit detection is performed in a non-contact manner, specifically, as shown in fig. 2, the sensing electrode 24 and the connecting lead 4 of the detection fixture are used as two parallel metal layers, and a capacitance formed between the sensing electrode 25 and the connecting lead 4 is determined by S, d, which affects the stability of the capacitance if the two are misaligned, and further affects the accuracy and sensitivity of open circuit detection. Moreover, each test of one luminescent substrate needs to be aligned again, and due to process fluctuation, consistency of S and d is difficult to ensure when different luminescent substrates are measured, so that a test result has larger fluctuation.

The light-emitting substrate provided by the embodiment of the application covers the first insulating layer on the surface of the connecting lead, and the detection electrode is arranged on one side, deviating from the connecting lead, of the first insulating layer, so that the detection electrode and the plurality of connecting leads form a capacitor structure, and the first insulating layer is equivalent to a dielectric layer of a capacitor. Can be integrated on luminescent substrate with the detection electrode that the lead wire forms the electric capacity like this for the positive opposite area between the capacitance electrode and the distance between the capacitance electrode are fixed, thereby the capacitance of the capacitance structure that detection electrode and many lead wires formed is more stable, can improve the accuracy and the sensitivity that the lead wire that connects broken circuit detected. In addition, the first insulating layer covers the surface of the connecting lead, so that the connecting lead can be protected, and the connecting lead is prevented from being damaged in the manufacturing process of the detection electrode.

In some embodiments, as shown in fig. 3, the plurality of connection leads 4 are arranged along the first direction Y, and the detection electrodes are strip-shaped electrodes extending along the first direction Y.

Note that, in order to clearly illustrate the positional relationship between the detection electrode and the plurality of connection leads, the first insulating layer is not shown in the peripheral region in fig. 3. Fig. 1 may be, for example, a cross-sectional view along AA' in fig. 3.

In some embodiments, as shown in fig. 3, the plurality of signal lines 2 extend in the second direction X, arranged in the first direction Y. The first direction Y intersects the second direction X. The first direction Y is perpendicular to the second direction X in fig. 3. The plurality of connecting leads 4 also extend in the second direction X.

As shown in fig. 1 and 3, only one end of the signal line 2 extending in the second direction X may be connected to the fanout line 3 through the connection lead 4. It is understood that the widths of the connecting leads 4 may be different, and the overlapping areas of the connecting leads 4 and the strip-shaped detection electrodes 6 may be the same or different. In a specific implementation, the width h1 of the strip-shaped electrodes may be set according to the length of the connecting leads in the second direction X in the peripheral area.

For example, in some embodiments, in the second direction X, the width h1 of the stripe electrode is greater than or equal to 100 micrometers and less than or equal to 200 micrometers.

In some embodiments, the fan-out lines extend along the second direction X and are arranged along the first direction Y.

In some embodiments, the fan-out lines, the signal lines, and the connecting leads correspond to one another.

In some embodiments, the material of the detection electrode comprises one or a combination of: copper-titanium alloy and aluminum-molybdenum alloy.

In some embodiments, the material of the first insulating layer comprises silicon nitride.

In some embodiments, the thickness of the first insulating layer is 0.6 microns or more and 1 micron or less.

In some embodiments, the display area further comprises: a plurality of pixels arranged in an array in a first direction Y and a second direction X; at least one pixel of the plurality of pixels includes: the pixel driving circuit comprises sub-pixels and a pixel driving chip for driving each sub-pixel in the pixel; the sub-pixel includes at least one light emitting device; the first electrode of the light emitting device is electrically connected with the pixel driving chip.

In a specific implementation, each sub-pixel may include one light emitting device, and each sub-pixel may also include more light emitting devices, for example, a sub-pixel may include two light emitting devices, and the application does not limit the number of light emitting diodes in a sub-pixel. For convenience of control, when the sub-pixel includes a plurality of light emitting devices, the color of each light emitting device in the sub-pixel is the same, and of course, the color of each light emitting device in the sub-pixel may not be completely the same in some cases, which is not limited in this application. In a specific implementation, when the sub-pixel includes a plurality of light emitting devices, the light emitting devices in the sub-pixel are connected in parallel, and certainly, the light emitting devices in the sub-pixel may also be connected in series, which is not limited in this application.

In some embodiments, each pixel comprises: a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel. In a specific implementation, the first color sub-pixel includes a red light emitting device R, the second color sub-pixel includes a blue light emitting device B, and the third color sub-pixel includes a green light emitting device G. That is, the first color sub-pixel is a red sub-pixel, the second color sub-pixel is a blue sub-pixel, and the third color sub-pixel is a green sub-pixel.

In some embodiments, the light emitting device comprises a micro-sized inorganic light emitting diode device.

In some embodiments, the Micro-sized inorganic Light Emitting Diode may be, for example, a Mini Light Emitting Diode (Mini-LED) or a Micro Light Emitting Diode (Micro-LED).

It should be noted that the Mini-LEDs and the Micro-LEDs have small sizes and high brightness, and can be applied to a large number of display devices or backlight modules thereof. For example, typical dimensions (e.g., length) of Micro-LEDs are less than 100 microns; typical dimensions (e.g. length) of the Mini-LED are between 80 and 350 microns.

In some embodiments, the plurality of signal lines includes: a plurality of power signal lines. In a specific implementation, the power signal line is coupled to the second electrode of the light emitting device.

In some embodiments, the plurality of signal lines further comprises: a plurality of data signal lines. In one embodiment, each data signal line is coupled to the data signal terminal of the pixel driving chip of a row of pixels arranged in the second direction X.

In some embodiments, the plurality of signal lines further comprises: and each of the plurality of address signal lines is coupled with an address signal end of a pixel driving chip of a row of pixels arranged in the second direction X.

In some embodiments, the plurality of signal lines further comprises: a plurality of fixed voltage signal lines. In a specific implementation, each of the fixed voltage signal lines is coupled to the fixed voltage signal terminals of the pixel driving chips of the row of pixels arranged in the second direction X.

In the specific implementation, for example, the power signal line, the data signal line, the fixed voltage signal line, and the address signal line are disposed in the same layer.

In some embodiments, the light emitting substrate further comprises: and the signal source is positioned on the back surface of the substrate base plate. The signal source is bound with the fanout line. The signal source can be coupled with the signal lines through the fan-out lines and the connecting leads so as to provide corresponding driving signals for the signal lines. In a specific implementation, the signal source may be an Integrated Circuit (IC), a Printed Circuit Board (PCB), a Flexible Printed Circuit (FPC), or the like, which is not limited in this application.

Next, the structure of the display region of the light emitting substrate provided in this embodiment will be described by taking the coupling of the power signal line and the light emitting device as an example.

In some embodiments, as shown in fig. 4, the light emitting substrate further includes: a first buffer layer 15 between the power supply signal line 14 and the substrate base plate 1, a second insulating layer 15 on a side of the power supply signal line 14 facing away from the buffer layer 15, a first pad 16 on a side of the second insulating layer 15 facing away from the power supply signal line 14, and a third insulating layer 17 on a side of the first pad 16 facing away from the second insulating layer 15. The second insulating layer 15 includes a first via 18, and the first pad 16 is electrically connected to the power signal line 14 through the first via 18. The third insulating layer 17 includes a second via 19, and the second electrode 202 of the light emitting device 20 is electrically connected to the first pad 16 through the second via 19. I.e., the second electrode of the light emitting device 20, is coupled to the power signal line 14 through the first pad 16.

In a specific implementation, the second insulating layer includes, for example: the second buffer layer, the first planarization layer and the first passivation layer are arranged in sequence. The third insulating layer includes, for example: the third buffer layer, the second planarization layer and the second passivation layer are arranged in sequence.

Based on the same inventive concept, the embodiment of the present application further provides a method for manufacturing a light emitting substrate, as shown in fig. 5, including:

s101, providing a substrate base plate; the front surface of the substrate base plate is provided with a display area and a peripheral area outside the display area; the back surface of the substrate base plate is provided with a fan-out area;

s102, forming a plurality of signal line patterns on the front surface of the substrate base plate; the signal lines extend from the display area to the peripheral area;

s103, forming a plurality of fan-out line patterns in the fan-out area;

s104, forming a plurality of patterns for connecting lead wires; the plurality of connecting leads extend to the fan-out area from the peripheral area through the side face of the substrate, one end of each connecting lead in the plurality of connecting leads is electrically connected with the signal wire, and the other end of each connecting lead in the plurality of connecting leads is electrically connected with the fan-out wire;

s105, forming a first insulating layer covering the surfaces of the connecting leads;

s106, forming a detection electrode pattern on one side, away from the connecting lead, of the first insulating layer in the peripheral area; in the peripheral area, the orthographic projection of the detection electrode on the substrate base plate and the orthographic projection of the plurality of connecting leads on the substrate base plate have overlapping.

According to the preparation method of the light-emitting substrate, the surface of the connecting lead is covered with the first insulating layer, and the detection electrode is formed on one side, away from the connecting lead, of the first insulating layer, so that the detection electrode and the connecting leads form a capacitor structure, and the first insulating layer is equivalent to a dielectric layer of a capacitor. Can be integrated on luminescent substrate with the detection electrode that the lead wire forms the electric capacity like this for the positive opposite area between the capacitance electrode and the distance between the capacitance electrode are fixed, thereby the capacitance of the capacitance structure that detection electrode and many lead wires formed is more stable, can improve the accuracy and the sensitivity that the lead wire that connects broken circuit detected. In addition, the first insulating layer covers the surface of the connecting lead, so that the connecting lead can be protected, and the connecting lead is prevented from being damaged in the manufacturing process of the detection electrode.

In some embodiments, the step S104 of forming a plurality of patterns of connecting leads specifically includes:

and forming a plurality of connecting lead patterns by adopting a sputtering process.

In particular, the plurality of connecting leads may be formed, for example, using a magnetron sputtering process.

In some embodiments, step S105 forms a first insulating layer covering the surface of the connecting lead, specifically including:

and forming a first insulating layer covering the surface of the connecting lead by adopting a sputtering process.

In specific implementation, the first insulating layer may be formed by, for example, a magnetron sputtering process.

In some embodiments, the step S106 of forming a detection electrode pattern on a side of the first insulating layer in the peripheral region, which side faces away from the connecting leads, specifically includes:

forming strip-shaped electrodes extending along a first direction on one side, away from the connecting leads, of the first insulating layer in the peripheral area; the first direction is the arrangement direction of the connecting leads.

In a specific implementation, for example, a sputtering process may be used to form a strip-shaped electrode extending along the first direction on a side of the first insulating layer in the peripheral region, the side facing away from the connecting lead.

In some embodiments, before forming the first insulating layer covering the surface of the connecting lead in step S105, the method further includes:

and in the region outside the connecting lead, a first protective film is respectively attached to one side of the signal wire, which is far away from the substrate base plate, and one side of the fan-out wire, which is far away from the substrate base plate.

Therefore, the first protective film attached to the front surface of the substrate base plate can protect the signal wire and other elements arranged on the front surface of the substrate base plate, the first protective film attached to the back surface of the substrate base plate can protect the exposed part of the fan-out wire, and the signal wire, other elements and the fan-out wire are prevented from being damaged in the process of forming the first insulating layer.

In some embodiments, step S105 further includes, after forming the first insulating layer on the surface of the connection lead:

tearing off the first protective film on one side of the fanout line, which is far away from the substrate;

attaching a second protective film covering the fan-out wire and the first insulating layer to one side of the fan-out wire, which is far away from the substrate; the second protective film extends to the peripheral area and covers the first insulating layer outside the detection electrode arrangement area.

Namely, the first insulating layer and the fan-out line outside the detection electrode setting area are protected by the second protective film.

In some embodiments, after the step S106 forms the pattern of the detection electrode on the side of the first insulating layer of the peripheral region facing away from the connection lead, the method further includes:

tearing off the first protective film and the second protective film;

and attaching a third protective film to the side of the signal line, which is far away from the substrate base plate.

According to the preparation method of the light-emitting substrate, the first protective film is torn off after the detection electrode is formed, so that the problem that the connection lead disconnection detection result is influenced by the material of the detection electrode left on the first protective film can be avoided. And the third protective film is attached subsequently, so that the signal line and other elements arranged on the front surface of the substrate can be protected continuously, and the signal line and other elements arranged on the front surface of the substrate are prevented from being damaged by the subsequent process flow.

In some embodiments, the first, second, and third protective films are Polyimide (PI) films.

Next, a method for manufacturing a light-emitting substrate provided in an embodiment of the present application is described as an example, and as shown in fig. 6, the method for manufacturing a light-emitting substrate includes the following steps:

s201, forming a plurality of patterns of signal lines 2 on the front surface of the substrate 1, and forming a plurality of patterns of fan-out lines 3 on the back surface of the substrate 1;

s202, forming a plurality of patterns of connecting leads 4 by adopting a sputtering process;

s203, respectively attaching first protective films 21 to the side, away from the substrate base plate 1, of the signal wire 2 and the side, away from the substrate base plate 1, of the fan-out wire 3 in the region outside the connecting lead 4;

s204, forming a first insulating layer 5 covering the surface of the connecting lead 4 by adopting a sputtering process;

s205, tearing off the first protective film 21 on the side, away from the substrate base plate 1, of the fan-out line 3, and attaching a second protective film 22 covering the fan-out line 3 and the first insulating layer 5 to the side, away from the substrate base plate 1, of the fan-out line 3; wherein the second protective film 22 extends to the front surface of the substrate base substrate 1, covering the first insulating layer 5 outside the detection electrode setting region;

s206, forming a pattern of the detection electrode 6 on the front surface of the substrate base plate 1 and on one side, away from the connecting lead 4, of the first insulating layer 5 by adopting a sputtering process;

s207, the first protective film 21 and the second protective film 22 are removed, and the third protective film 23 is attached to the signal line 2 on the side away from the base substrate 1.

Based on the same inventive concept, an embodiment of the present application further provides a method for detecting a light-emitting substrate, as shown in fig. 7, including:

it is determined whether there is an open circuit of the connection lead 4 based on a signal of the capacitance formed between the detection electrode 6 and the connection lead 4.

In some embodiments, as shown in fig. 7, determining whether there is an open circuit in the connection lead according to a signal of a capacitance formed between the detection electrode and the connection lead specifically includes:

the fanout wire 3 is contacted with a signal loading probe 9 of a lower platform 7 of the detection jig, meanwhile, the detection electrode 6 is contacted with a signal receiving probe 10 of an upper platform 8 of the detection jig, and whether the connection lead 4 is broken is determined according to a signal received by the signal receiving probe 10.

In a specific implementation, the detection of whether the connection lead is broken may be performed during the manufacturing process of the light emitting substrate, that is, after the detection electrode is formed, the detection method provided in the embodiment of the present application is used to detect whether the connection lead is broken. And after the condition that the connecting lead is not broken is determined, carrying out the subsequent manufacturing process of the light-emitting substrate.

In a specific implementation, as shown in fig. 7, for example, after the first protective film on the front surface of the base substrate 1 and the second protective film on the back surface of the base substrate are removed and the third protective film 23 is attached to the front surface of the base substrate 1, a signal of capacitance formed between the detection electrode 6 and the connection lead 4 may be detected by a detection jig. Thus, the signal wires on the front side of the substrate can be prevented from being damaged in the detection process.

In particular, when the connection lead is subjected to an open circuit test, the light emitting device and the pixel driving chip are not bound in the display area of the light emitting substrate. And after the connecting lead is determined to have no open circuit, subsequent processes of flip chip, die bonding, packaging and bonding of the light-emitting device and the pixel driving chip can be carried out, and the manufacturing of the complete light-emitting substrate is completed.

An embodiment of the present application provides a display device, including: according to the luminous base plate that this application embodiment provided.

In some embodiments, a display device includes a plurality of tiled light emitting substrates provided by embodiments of the present application. Namely, the display device is a tiled display device.

According to the splicing display device provided by the embodiment of the application, each signal line is led out to the back surface of the substrate through the connecting lead, so that narrow-frame display can be realized.

The display device provided by the embodiment of the application is as follows: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the present application. The implementation of the display device can be seen in the above embodiments of the light emitting substrate, and repeated descriptions are omitted.

In summary, according to the light emitting substrate, the manufacturing method thereof, the detection method thereof and the display device provided by the embodiment of the application, the first insulating layer covers the surface of the connecting lead, and the detection electrode is formed on one side of the first insulating layer away from the connecting lead, so that the detection electrode and the plurality of connecting leads form a capacitor structure, and the first insulating layer is equivalent to a dielectric layer of a capacitor. Can be integrated on luminescent substrate with the detection electrode that the lead wire forms the electric capacity like this for the positive opposite area between the capacitance electrode and the distance between the capacitance electrode are fixed, thereby the capacitance of the capacitance structure that detection electrode and many lead wires formed is more stable, can improve the accuracy and the sensitivity that the lead wire that connects broken circuit detected. In addition, the first insulating layer covers the surface of the connecting lead, so that the connecting lead can be protected, and the connecting lead is prevented from being damaged in the manufacturing process of the detection electrode.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.