CN109935571B - Display substrate and manufacturing method thereof, crack detection method and display device - Google Patents
Display substrate and manufacturing method thereof, crack detection method and display device Download PDFInfo
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- CN109935571B CN109935571B CN201910261909.5A CN201910261909A CN109935571B CN 109935571 B CN109935571 B CN 109935571B CN 201910261909 A CN201910261909 A CN 201910261909A CN 109935571 B CN109935571 B CN 109935571B
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Abstract
The invention discloses a display substrate and a manufacturing method thereof, a crack detection method and a display device, relates to the technical field of display, and aims to solve the problems that the conventional crack detection mode is complex to operate and the difficulty of wiring in the edge area of a display screen is easily increased. The display substrate includes a pixel unit and a data signal line, the data signal line is used for writing a data voltage signal into the pixel unit, the display substrate further includes an electrostatic discharge circuit, the electrostatic discharge circuit includes: a first electrostatic discharge line; the first electrostatic discharge sub-circuit is respectively connected with the data signal line and the first electrostatic discharge line, a connecting line included in the first electrostatic discharge sub-circuit is multiplexed into a crack detection line, and the crack detection line is positioned in a peripheral area surrounding a display area in the display substrate and extends along the edge of the display substrate; the first electrostatic discharge sub-circuit is used for: and when the crack detection line breaks at the detection time period, the connection between the data signal line and the first electrostatic discharge line is conducted. The display substrate provided by the invention is used for displaying.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display substrate, a manufacturing method of the display substrate, a crack detection method and a display device.
Background
With the continuous development of display technology, the application of the organic light emitting diode display screen is more and more extensive, and cracks are easily generated in the edge area of the display screen in the preparation process of the organic light emitting diode display screen, and the cracks easily influence the reliability of the display screen. In the prior art, in order to ensure the reliability of a manufactured display screen, a crack detection line and a detection circuit are generally arranged in an edge area of the display screen, and whether cracks exist in the edge area of the display screen is determined through the cooperation of the detection circuit and the crack detection line.
Although the above-mentioned method can detect whether there is a crack in the edge area of the display screen, the detection method is complicated, and a detection circuit needs to be provided in the edge area of the display screen, which easily increases the difficulty of wiring in the edge area of the display screen.
Disclosure of Invention
The invention aims to provide a display substrate, a manufacturing method thereof, a crack detection method and a display device, which are used for solving the problems that the conventional crack detection mode is complex in operation and the difficulty of wiring in the edge area of a display screen is easily increased.
In order to achieve the above purpose, the invention provides the following technical scheme:
a first aspect of the present invention provides a display substrate including a pixel unit and a data signal line for writing a data voltage signal to the pixel unit, the display substrate further including an electrostatic discharge circuit, the electrostatic discharge circuit including:
a first electrostatic discharge line;
the first electrostatic discharge sub-circuit is respectively connected with the data signal line and the first electrostatic discharge line, connecting lines included in the first electrostatic discharge sub-circuit are multiplexed into crack detection lines, and the crack detection lines are located in a peripheral area surrounding a display area in the display substrate and extend along the edge of the display substrate; the first electrostatic discharge sub-circuit is used for: and when the crack detection line breaks in the detection period, the connection between the data signal line and the first electrostatic discharge line is conducted.
Optionally, the first electrostatic discharge sub-circuit includes:
a first transistor, a first pole of which is connected to the data signal line, a second pole of which is connected to the first electrostatic discharge line, a gate of which is connected to a first end of the crack detection line, and a second end of the crack detection line is connected to the first electrostatic discharge line.
Optionally, the electrostatic discharge circuit includes a plurality of electrostatic discharge sub-circuits, the crack detection lines in each of the electrostatic discharge sub-circuits are insulated from each other, and an orthographic projection of the crack detection lines in each of the electrostatic discharge sub-circuits on the substrate of the display substrate surrounds the display area.
Optionally, in the crack detection lines included in each of the electrostatic discharge sub-circuits, adjacent crack detection lines are arranged in different layers, and orthographic projections of adjacent portions of the adjacent crack detection lines on the substrate have an overlapping region.
Optionally, the electrostatic discharge circuit further includes:
a second electrostatic discharge line;
a second electrostatic discharge sub-circuit connected to the data signal line and the second electrostatic discharge line, respectively, the second electrostatic discharge sub-circuit being configured to: discharging a second electrostatic charge generated on the data signal line to the second electrostatic discharge line.
Optionally, the second electrostatic discharge sub-circuit includes:
and a second transistor, a first pole of which is connected to the data signal line, a second pole of which is connected to the second electrostatic discharge line, and a gate of which is connected to the first pole of the second transistor.
Based on the technical solution of the display substrate, a second aspect of the invention provides a display device, which includes the display substrate.
Based on the technical solution of the display substrate, a third aspect of the present invention provides a crack detection method for a display substrate, which is applied to the display substrate, and the detection method includes:
and in the detection period, when the multiplexed crack detection lines in the display substrate break, the first electrostatic discharge sub-circuit in the display substrate conducts the connection between the data signal lines and the first electrostatic discharge lines in the display substrate.
Based on the above technical solution of the display substrate, a fourth aspect of the present invention provides a method for manufacturing a display substrate, for manufacturing the display substrate, where the method for manufacturing the display substrate includes a step of manufacturing an electrostatic discharge circuit, and the step of manufacturing the electrostatic discharge circuit specifically includes:
manufacturing a first electrostatic discharge line;
manufacturing a first electrostatic discharge sub-circuit which is respectively connected with a data signal line and the first electrostatic discharge line in the display substrate, wherein connecting lines included in the first electrostatic discharge sub-circuit are multiplexed into crack detection lines, and the crack detection lines are located in the peripheral area of the display substrate and extend along the edge of the display substrate; the first electrostatic discharge sub-circuit is used for: and when the crack detection line breaks in the detection period, the connection between the data signal line and the first electrostatic discharge line is conducted.
Optionally, when the first electrostatic discharge sub-circuit includes a first transistor, the step of manufacturing the first electrostatic discharge sub-circuit specifically includes:
and manufacturing a grid electrode of the first transistor and the crack detection line connected with the grid electrode through the same patterning process.
According to the technical scheme provided by the invention, a first electrostatic discharge line and a first electrostatic discharge sub-circuit connected between the first electrostatic discharge line and a data signal line are arranged, a connecting line in the first electrostatic discharge sub-circuit is multiplexed into a crack detection line, the crack detection line is arranged in the peripheral area of a display substrate and can extend along the edge of the display substrate, and when the crack detection line is broken, the first electrostatic discharge sub-circuit controls and conducts the connection between the data signal line and the first electrostatic discharge line, so that when the display substrate displays a preset display picture, a line with abnormal brightness appears in the display area; when the crack detection line is not broken, the first electrostatic discharge sub-circuit controls to disconnect the data signal line and the first electrostatic discharge line, so that the display substrate displays a normal preset display picture; therefore, according to the technical scheme provided by the invention, the connecting lines in the first electrostatic discharge sub-circuit are multiplexed into the crack detection line, and the first electrostatic discharge sub-circuit can be in different working states under the conditions that the crack detection line is broken and the crack detection line is not broken, so that the display substrate is correspondingly controlled to be in different display states, and whether cracks exist in the edge area of the display substrate is judged according to the picture state displayed by the display substrate.
Therefore, in the technical scheme provided by the invention, the detection of the cracks on the periphery of the display substrate can be realized without arranging a special crack detection circuit, and the space for wiring in the edge area of the display substrate is increased, so that the difficulty of wiring in the edge area of the display substrate is reduced, and the risk of poor display substrate is well reduced. In addition, in the technical scheme provided by the invention, the crack detection is realized by utilizing the original static discharge circuit in the display substrate, and the switching of the display substrate between the crack detection and the display function detection is not required to be controlled, so that the complexity of the crack detection is well reduced, and the crack detection of the display substrate is simpler, easier and more efficient. In addition, according to the technical scheme provided by the invention, not only can crack detection in a cell state be realized, but also whether cracks occur in a module manufacturing process stage can be detected after a module is formed, and the crack detection in the module state is simple, easy and efficient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of an ESD in the prior art.
FIG. 2 is a schematic diagram illustrating an embodiment of a crack detection line in an electrostatic discharge circuit without cracking;
FIG. 3 is a schematic diagram illustrating crack detection line breakage in an electrostatic discharge circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a crack detection line enclosing a display area provided by an embodiment of the invention;
FIG. 5 is a schematic diagram of a staggered arrangement of crack detection lines provided by an embodiment of the invention;
fig. 6 is a schematic flow chart illustrating a method for manufacturing an electrostatic discharge circuit according to an embodiment of the present invention.
Detailed Description
In order to further explain the display substrate and the manufacturing method thereof, the crack detection method, and the display device provided by the embodiments of the invention, the following detailed description is made with reference to the drawings of the specification.
In the related art, when manufacturing an organic light emitting diode display screen, a display mother board is generally manufactured, and then the display mother board is cut to form a single display substrate, which may also be referred to as a cell unit.
More specifically, in order to perform crack detection, generally, a crack detection line is arranged in an edge region of a display substrate, a crack detection circuit is arranged in the edge region of the display substrate, the crack detection line is connected to a data signal line of the display substrate through the crack detection circuit, when crack detection is performed, the crack detection circuit controls and conducts connection between the crack detection line and the data line, and if the crack detection line is broken, the broken crack detection line increases resistance, so that the data signal line connected with the broken crack detection line is insufficient in writing of a data signal, and an image displayed by the display substrate has an unlighted line; when the display function of the display substrate is detected, the crack detection circuit controls and disconnects the connection between the crack detection line and the data line number line, and normal display function detection of the display substrate can be realized.
From the above analysis, it can be seen that, in the related art, when crack detection is performed, a special crack detection circuit needs to be manufactured in an edge region of a display substrate, and switching between crack detection and display function detection is realized by controlling the crack detection circuit, so that not only is complexity of crack detection increased, but also an available region for arranging other circuits in the edge region of the display substrate is reduced, difficulty in wiring in the edge region of a display screen is increased, and further, risk of occurrence of defects in the display substrate is increased.
Based on the above problems, the inventors of the present invention have studied and found that the crack detection line can be combined with the existing electrostatic discharge circuit (such as the ESD circuit in fig. 1) in the display substrate, and a special crack detection circuit can be eliminated, so as to solve the above problems, and the specific scheme is as follows:
referring to fig. 2 and fig. 4, an embodiment of the invention provides a display substrate 1, which includes a pixel unit and a data signal line 11, wherein the data signal line 11 is used for writing a data voltage signal to the pixel unit, the display substrate 1 further includes an electrostatic discharge circuit 12, and the electrostatic discharge circuit 12 includes: a first electrostatic discharge line 120; and a first electrostatic discharge sub-circuit 123 connected to the data signal line 11 and the first electrostatic discharge line 120, respectively, connection lines included in the first electrostatic discharge sub-circuit 123 are multiplexed into a crack detection line 13, and the crack detection line 13 is located in a peripheral region of the display substrate 1 surrounding the display region 10 and extends along an edge of the display substrate 1; the first electrostatic discharge sub-circuit 123 is configured to: when the crack detection line 13 is broken during the detection period, the connection between the data signal line 11 and the first electrostatic discharge line 120 is made conductive as shown in fig. 3.
Specifically, the above-described electrostatic discharge sub-circuit is generally composed of a transistor, which is required to be electrically connected to the data signal line 11 and/or the first electrostatic discharge line 120 through a connection line, which is multiplexed as the crack detection line 13, and the crack detection lines 13 are disposed in the peripheral region of the display region 10 and extend along the edge of the display substrate 1, it is possible to make the crack detection lines, when cracks occur in the peripheral region of the display substrate 1, the cracks may cause the crack detecting lines 13 to be broken, the broken crack detecting lines 13 may cause the connection relationship between the transistors and the data signal line 11 and/or the first electrostatic discharge line 120 to be changed, thereby affecting the signal written on the data signal line 11, changing the state of the picture displayed on the display substrate 1, and therefore, whether the edge of the display substrate 1 has cracks can be judged according to the display screen state of the display substrate 1.
It should be noted that when the connecting lines are multiplexed into the crack detection lines 13, the lengths and specific positions of the crack detection lines 13 can be set according to actual needs.
When the display substrate 1 is subjected to crack detection, electrostatic charges are easily generated on the data signal line 11 of the display substrate 1 at the moment of lighting the display substrate 1 and at the moment of closing the display substrate 1, and when the charges are accumulated to a certain degree, the charges can be discharged to the first electrostatic discharge line 120 through the first electrostatic discharge sub-circuit 123, so that the data signal line 11 is prevented from being damaged by the electrostatic charges, and the reliability of the display substrate 1 is ensured. After the display substrate 1 is in a stable lighting state, that is, in a detection period, when the crack detection line 13 is broken, the electrostatic discharge sub-circuit can control and conduct the connection between the data signal line 11 and the first electrostatic discharge line 120, that is, an electric signal on the first electrostatic discharge line 120 is written into a data signal, so as to control the pixel unit correspondingly connected with the data signal line 11 to display different brightness from other pixel units, that is, a line with abnormal brightness appears in a preset display picture of the display substrate 1, thereby realizing crack detection on the display substrate 1; when the crack detection line 13 is not broken, the electrostatic discharge sub-circuit can control to disconnect the connection between the data signal line 11 and the first electrostatic discharge line 120, so that the display substrate 1 displays a normal preset display picture.
As can be seen from the specific structure of the display substrate 1 and the process of performing crack detection provided in the foregoing embodiment, in the display substrate 1 provided in the embodiment of the present invention, the first electrostatic discharge line 120 and the first electrostatic discharge sub-circuit 123 connected between the first electrostatic discharge line 120 and the data signal line 11 are provided, and the connection lines in the first electrostatic discharge sub-circuit 123 are multiplexed into the crack detection lines 13, the crack detection lines 13 are disposed in the peripheral region of the display substrate 1 and can extend along the edge of the display substrate 1, when the crack detection lines 13 are broken, the first electrostatic discharge sub-circuit 123 controls to conduct the connection between the data signal line 11 and the first electrostatic discharge line 120, so that when the display substrate 1 displays a preset display screen, lines of abnormal brightness appear in the display region 10; when the crack detection line 13 is not broken, the first electrostatic discharge sub-circuit 123 controls to disconnect the connection between the data signal line 11 and the first electrostatic discharge line 120, so that the display substrate 1 displays a normal preset display picture; as can be seen, in the display substrate 1 provided in the embodiment of the present invention, the connection lines in the first electrostatic discharge sub-circuit 123 are multiplexed into the crack detection lines 13, and when the crack detection lines 13 are broken and are not broken, the first electrostatic discharge sub-circuit 123 can be in different working states, so that the display substrate 1 is correspondingly controlled to be in different display states, and whether cracks exist in the edge area of the display substrate 1 is determined according to the picture state displayed by the display substrate 1.
Therefore, in the display substrate 1 provided in the embodiment of the present invention, the detection of the cracks around the display substrate 1 can be achieved without providing a special crack detection circuit, and the space in which the edge region of the display substrate 1 can be used for wiring is increased, so that the difficulty of wiring in the edge region of the display substrate 1 is reduced, and the risk of the display substrate 1 being defective is well reduced. In addition, in the display substrate 1 provided by the embodiment of the present invention, the crack detection is realized by using the original electrostatic discharge circuit 12 in the display substrate 1, and the switching between the crack detection and the display function detection of the display substrate 1 does not need to be controlled, so that the complexity of the crack detection is well reduced, and the crack detection of the display substrate 1 is simpler, easier and more efficient.
In addition, it should be noted that the display substrate 1 provided in the embodiment of the present invention can detect cracks in a cell state, and after a module is formed, that is, after the flexible circuit board and the driving chip are bonded to the display substrate 1, it can also detect whether cracks are generated in a module manufacturing process, and the crack detection in the module state is also simple, easy and efficient.
In some embodiments, the first electrostatic discharge sub-circuit 123 provided in the above embodiments may include a first transistor T1, a first pole of the first transistor T1 is connected to the data signal line 11, a second pole of the first transistor T1 is connected to the first electrostatic discharge line 120, a gate of the first transistor T1 is connected to a first end of the crack detection line 13, and a second end of the crack detection line 13 is connected to the first electrostatic discharge line 120.
A specific implementation is given below, and a detailed description is given of a specific crack detection process when the first electrostatic discharge sub-circuit 123 includes the first transistor T1.
Illustratively, the display substrate 1 includes red pixel cells, green pixel cells and blue pixel cells, each pixel cell is distributed in an array, the red pixel cells and the blue pixel cells are located in a same column and are alternately arranged in the same column, the green pixel cells are located in the same column, the first transistor T1 is connected to the data signal line 11 corresponding to the green pixel cell in the column, the first transistor T1 is a P-type transistor, the first electrostatic discharge line 120 is loaded with a high-level signal, and the potential of the high-level signal is 7V.
When a lighting test is performed on the display substrate 1, a 2V voltage signal is written to each data signal line 11 included in the display substrate 1, that is, the data voltages written to the red pixel cell, the green pixel cell, and the blue pixel cell are all controlled to be 2V, so that a preset initial white picture is displayed on the display substrate 1, and at the moment when the display substrate 1 is turned on or turned off, electrostatic charges are easily generated on the data signal lines 11, and when the electrostatic charges are positive charges and are accumulated to a certain extent (for example, 50V), the first transistor T1 can be controlled to be turned on, and the charges accumulated on the data signal lines 11 are discharged through the first electrostatic discharge line 120, thereby protecting the data signal lines 11.
When the display substrate 1 is in a stable display period, that is, a detection period for detecting cracks in the edge area of the display substrate 1 is entered, and in this detection period, when the crack detection line 13 is not broken, the gate of the first transistor T1 and the second pole (i.e., the source) of the first transistor T1 are shorted, and the first transistor T1 is controlled to be in an off state, at which time the display substrate 1 displays a normal white picture. When the crack detection line 13 is broken, the source potential of the first transistor T1 is 7V, the potential of the first electrode (i.e., the drain) of the first transistor T1 is 2V, and the potential of the gate of the first transistor T1 is 0V, so that the potential difference Vgs between the gate and the source of the first transistor T1 is-7V, and the threshold voltage Vth of the P-type transistor is generally-2V, so that Vgs < Vth, and the first transistor T1 is turned on, so that the connection between the data signal line 11 and the first electrostatic discharge line 120 is turned on, the electric signal on the first electrostatic discharge line 120 is written on the data signal line 11, the voltage of the data voltage signal written on the data signal line 11 is pulled high, so that the pixel cell connected to the data signal line 11 displays an abnormality, and it can be determined that a crack exists in the edge region of the display substrate 1.
It should be noted that, when the first transistor T1 is turned on, so that the voltage of the data voltage signal written on the data signal line 11 is pulled high, the display brightness of the pixel unit connected to the data signal line 11 is darkened, so that a dark line with darker display brightness appears in the white picture displayed on the display substrate 1, and it can be determined that there is a crack in the edge area of the display substrate 1 according to the dark line.
After the display module is formed by using the display substrate 1 provided in the above embodiment, whether cracks occur in the process of manufacturing the display module can be determined by using the same method as above.
In some embodiments, the electrostatic discharge circuit 12 provided by the above embodiments may include a plurality of electrostatic discharge sub-circuits, the crack detection lines 13 in each electrostatic discharge sub-circuit are insulated from each other, and an orthogonal projection of the crack detection lines 13 in each electrostatic discharge sub-circuit on the substrate of the display substrate 1 surrounds the display area 10.
Specifically, the electrostatic discharge circuit 12 may include a plurality of electrostatic discharge sub-circuits, each of the electrostatic discharge sub-circuits may share one first electrostatic discharge line 120, and the crack detection lines 13 multiplexed in each of the electrostatic discharge sub-circuits are located in the peripheral region of the display substrate 1 and can extend along the edge line of the display substrate 1, so that the specific distribution position, the extending direction and the extending length of each crack detection line 13 may be set according to actual needs, so that the orthographic projection of each crack detection line 13 on the substrate of the display substrate 1 can surround the display region 10, thereby implementing crack detection on any position of the edge region of the display substrate 1.
For example, as shown in fig. 4, the electrostatic discharge circuit 12 may include two first electrostatic discharge sub-circuits 123, wherein the crack detection lines 13 multiplexed in one electrostatic discharge sub-circuit can extend for half of the length of the edge line of the display substrate 1, the crack detection lines 13 multiplexed in the other electrostatic discharge sub-circuit can extend for the other half of the length of the edge line of the display substrate 1, and the two crack detection lines 13 are respectively located on two sides of the display substrate 1 and jointly surround the display area 10 of the display substrate 1.
It should be noted that the crack detection lines 13 in each esd subcircuit should be insulated from each other to avoid the first esd subcircuit 123 from performing a normal esd discharging function or a crack detection function due to a short circuit between the crack detection lines 13.
Further, among the crack detection lines 13 included in each electrostatic discharge sub-circuit, the adjacent crack detection lines 13 may be arranged in different layers, and the orthographic projections of the adjacent portions of the adjacent crack detection lines 13 on the substrate may have an overlapping region.
Specifically, among the crack detection lines 13 included in each electrostatic discharge sub-circuit, the adjacent crack detection lines 13 are arranged in different layers, and the orthographic projections of the portions, close to the adjacent crack detection lines 13, on the substrate have an overlapping region, so that the orthographic projections of the crack detection lines 13 on the substrate can form a closed surrounding line, that is, each crack detection line 13 can completely surround the display region 10 of the display substrate 1, and no gap exists, thereby better ensuring that the cracks appearing in the peripheral region of the display substrate 1 are detected.
In addition, as shown in fig. 5, the crack detection lines 13 included in each electrostatic discharge sub-circuit may be all arranged in the same layer, and the portions of the adjacent crack detection lines 13 are arranged to be staggered (as shown in a in fig. 5), that is, the portion of one crack detection line 13 adjacent to the other crack detection line 13 is located between the display area 10 and the other crack detection line 13, so that the orthographic projection of each crack detection line 13 on the substrate can completely surround the display area 10, and the short circuit phenomenon between the adjacent crack detection lines 13 is avoided.
Referring to fig. 2, in some embodiments, the electrostatic discharge circuit 12 provided in the above embodiments may further include: a second electrostatic discharge line 121; and a second electrostatic discharge sub-circuit 124 connected to the data signal line 11 and the second electrostatic discharge line 121, respectively, the second electrostatic discharge sub-circuit 124 being configured to: the second electrostatic charge generated on the data signal line 11 is discharged to the second electrostatic discharge line 121.
Specifically, the first electrostatic discharge line 120 may be loaded with a high-level signal, the second electrostatic discharge line 121 may be loaded with a low-level signal, and when a lighting test is performed on the display substrate 1, a data voltage signal is written to each data signal line 11 included in the display substrate 1, and at the moment when the display substrate 1 is turned on or turned off for display, electrostatic charges are easily generated on the data signal lines 11, and when the electrostatic charges are positive charges and accumulated to a certain extent, the positive charges can be discharged through the first electrostatic discharge line 120 by the first electrostatic discharge sub-circuit 123, thereby protecting the data signal lines 11; when the electrostatic charge generated on the data signal line 11 is negative and accumulated to a certain extent, the second electrostatic discharge sub-circuit 124 can discharge the negative charge through the second electrostatic discharge line 121, thereby protecting the data signal line 11.
Further, the second electrostatic discharge sub-circuit 124 provided in the above embodiment may specifically include a second transistor T2, a first pole of the second transistor T2 is connected to the data signal line 11, a second pole of the second transistor T2 is connected to the second electrostatic discharge line 121, and a gate of the second transistor T2 is connected to the first pole of the second transistor T2.
Specifically, at the moment when the display substrate 1 is turned on or off for display, electrostatic charge is easily accumulated on the data signal line 11, and when a certain degree of negative charge is accumulated on the data signal line 11, the second transistor T2 can be turned on to discharge the negative charge accumulated on the data signal line 11 through the second electrostatic discharge line 121, thereby protecting the data signal line 11; when the display substrate 1 is in a stable display state, and negative electrostatic charges do not need to be discharged through the second transistor T2, the second transistor T2 is in an off state, so that the normal loading of the data voltage signal on the data signal line 11 is not affected, and the normal display state of the display substrate 1 is ensured.
The embodiment of the invention also provides a display device, which comprises the display substrate 1 provided by the embodiment.
In the display substrate 1 provided by the above embodiment, the detection of the cracks around the display substrate 1 can be realized without setting a special crack detection circuit, and the space in which the edge region of the display substrate 1 can be used for wiring is increased, so that the difficulty of wiring in the edge region of the display substrate 1 is reduced, and the risk of occurrence of defects in the display substrate 1 is well reduced. In addition, in the display substrate 1 provided in the above embodiment, the crack detection is realized by using the original electrostatic discharge circuit 12 in the display substrate 1, and the switching between the crack detection and the display function detection of the display substrate 1 does not need to be controlled, so that the complexity of the crack detection is well reduced, and the crack detection of the display substrate 1 is simpler, easier and more efficient. Meanwhile, after the display substrate 1 provided by the embodiment is used for forming a module, whether cracks occur in the module manufacturing process can be detected, and the crack detection in the module state is simple, easy and efficient. Therefore, the display device provided by the embodiment of the invention has the same beneficial effects when the display device comprises the display substrate 1 provided by the embodiment, and the description is omitted here.
The display device may be: the display device comprises a television, a display, a digital photo frame, a mobile phone, a tablet personal computer and any other product or component with a display function, wherein the display device further comprises a flexible circuit board, a printed circuit board, a back plate and the like.
The embodiment of the present invention further provides a crack detection method for a display substrate 1, which is applied to the display substrate 1 provided in the above embodiment, and the detection method includes:
in the detection period, when the crack detection line 13 multiplexed in the display substrate 1 is broken, the first electrostatic discharge sub-circuit 123 in the display substrate 1 turns on the connection between the data signal line 11 and the first electrostatic discharge line 120 in the display substrate 1.
Specifically, when crack detection is performed on the display substrate 1 provided in the above embodiment, static charge is easily generated on the data signal line 11 of the display substrate 1 at the moment of lighting the display substrate 1 and at the moment of turning off the display substrate 1, and when the charge is accumulated to a certain extent, the charge can be discharged to the first static electricity discharge line 120 through the first static electricity discharge sub-circuit 123, so that damage to the data signal line 11 due to static electricity is avoided, and the reliability of the display substrate 1 is ensured. After the display substrate 1 is in a stable lighting state, that is, in a detection period, when the crack detection line 13 is broken, the electrostatic discharge sub-circuit can control and conduct the connection between the data signal line 11 and the first electrostatic discharge line 120, that is, an electric signal on the first electrostatic discharge line 120 is written into a data signal, so as to control the pixel unit correspondingly connected with the data signal line 11 to display different brightness from other pixel units, that is, a line with abnormal brightness appears in a preset display picture of the display substrate 1, thereby realizing crack detection on the display substrate 1; when the crack detection line 13 is not broken, the electrostatic discharge sub-circuit can control to disconnect the connection between the data signal line 11 and the first electrostatic discharge line 120, so that the display substrate 1 displays a normal preset display picture.
When the crack detection method provided by the embodiment of the invention is used for crack detection of the display substrate 1 provided by the embodiment, when the crack detection line 13 is broken, the first electrostatic discharge sub-circuit 123 controls connection between the conducting data signal line 11 and the first electrostatic discharge line 120, so that when the display substrate 1 displays a preset display screen, a line with abnormal brightness appears in the display area 10; when the crack detection line 13 is not broken, the first electrostatic discharge sub-circuit 123 controls to disconnect the connection between the data signal line 11 and the first electrostatic discharge line 120, so that the display substrate 1 displays a normal preset display picture; as can be seen, when the crack detection method provided by the embodiment of the present invention is used to perform crack detection on the display substrate 1, the first electrostatic discharge sub-circuit 123 can be in different working states when the crack detection line 13 is broken and when the crack detection line is not broken, so as to correspondingly control the display substrate 1 to be in different display states, and determine whether a crack exists in the edge area of the display substrate 1 according to the picture state displayed by the display substrate 1.
Therefore, when the crack detection method provided by the embodiment of the invention is used for detecting cracks of the display substrate 1, the cracks around the display substrate 1 can be detected without arranging a special crack detection circuit in the display substrate 1, and the space for wiring in the edge area of the display substrate 1 is increased, so that the difficulty of wiring in the edge area of the display substrate 1 is reduced, and the risk of poor display substrate 1 is well reduced. In addition, the crack detection method provided by the embodiment of the invention realizes the crack detection by using the original electrostatic discharge circuit 12 in the display substrate 1, and does not need to control the display substrate 1 to switch between the crack detection and the display function detection, thereby well reducing the complexity of the crack detection and enabling the crack detection of the display substrate 1 to be simpler, easier and more efficient.
In addition, the crack detection method provided by the embodiment of the invention can realize crack detection in a cell state, can also realize whether cracks are generated in a module process stage after a module is formed, and is simple, easy and efficient in crack detection in the module state.
Further, when the first electrostatic discharge sub-circuit 123 provided in the above-described embodiment includes the first transistor T1, in the crack detection period, when the crack detection line 13 is broken, the first transistor T1 is turned on, so as to control the connection between the data signal line 11 and the first electrostatic discharge line 120 to be turned on, that is, the electric signal on the first electrostatic discharge line 120 is written onto the data signal, so as to control the pixel cell to which the data signal line 11 is correspondingly connected to display a luminance different from that of other pixel cells, that is, so that the display substrate 1 has a line of abnormal luminance in a preset display screen, thereby realizing the crack detection of the display substrate 1; when the crack detection line 13 is not broken, the first transistor T1 is turned off, thereby controlling the disconnection between the data signal line 11 and the first electrostatic discharge line 120, and causing the display substrate 1 to display a normal preset display screen.
The embodiment of the present invention further provides a manufacturing method of a display substrate 1, which is used for manufacturing the display substrate 1 provided in the above embodiment, the manufacturing method includes a step of manufacturing an electrostatic discharge circuit 12, and the step of manufacturing the electrostatic discharge circuit 12 specifically includes: manufacturing a first electrostatic discharge line 120; and making a first electrostatic discharge sub-circuit 123 respectively connected with the data signal line 11 and the first electrostatic discharge line 120 in the display substrate 1, wherein connecting lines included in the first electrostatic discharge sub-circuit 123 are multiplexed into a crack detection line 13, and the crack detection line 13 is located in a peripheral area in the display substrate 1 and extends along the edge of the display substrate 1; the first electrostatic discharge sub-circuit 123 is configured to: when the crack detection line 13 is broken during the detection period, the connection between the data signal line 11 and the first electrostatic discharge line 120 is turned on.
Specifically, when the display substrate 1 provided in the above embodiment is manufactured, the method includes manufacturing the pixel unit, the data signal line 11, and the electrostatic discharge circuit 12 in the display substrate 1; the steps of manufacturing the electrostatic discharge circuit 12 specifically include: the first electrostatic discharge line 120 and the first electrostatic discharge sub-circuit 123 are manufactured, when the first electrostatic discharge sub-circuit 123 is manufactured, the first electrostatic discharge sub-circuit 123 generally includes a transistor and a connecting line for connecting the transistor with the data signal line 11 and the first electrostatic discharge line 120, the connecting line has a conductive performance, when the connecting line is manufactured, the connecting line can be formed in a peripheral area of the display substrate 1 and extends along an edge of the display substrate 1, so that when a crack occurs in an area covered by the connecting line, a fracture phenomenon can occur on the connecting line, thereby affecting a connection relationship between the transistor and the data signal line 11 and the first electrostatic discharge line 120, changing an effect of a picture displayed by the display substrate 1, and realizing crack detection on the peripheral area of the display substrate 1.
In the display substrate 1 manufactured by the manufacturing method provided by the embodiment of the invention, the first electrostatic discharge line 120 and the first electrostatic discharge sub-circuit 123 connected between the first electrostatic discharge line 120 and the data signal line 11 are formed, and the connecting line in the first electrostatic discharge sub-circuit 123 is multiplexed into the crack detection line 13, the crack detection line 13 is arranged in the peripheral area of the display substrate 1 and can extend along the edge of the display substrate 1, when the crack detection line 13 is broken, the first electrostatic discharge sub-circuit 123 controls to conduct the connection between the data signal line 11 and the first electrostatic discharge line 120, so that the display area 10 has a line with abnormal brightness when the display substrate 1 displays a preset display picture; when the crack detection line 13 is not broken, the first electrostatic discharge sub-circuit 123 controls to disconnect the connection between the data signal line 11 and the first electrostatic discharge line 120, so that the display substrate 1 displays a normal preset display picture; as can be seen, in the display substrate 1 manufactured by the manufacturing method provided by the embodiment of the present invention, the connecting lines in the first electrostatic discharge sub-circuit 123 are multiplexed into the crack detection lines 13, and when the crack detection lines 13 are broken and are not broken, the first electrostatic discharge sub-circuit 123 can be in different working states, so that the display substrate 1 is correspondingly controlled to be in different display states, and whether cracks exist in the edge area of the display substrate 1 is determined according to the picture state displayed by the display substrate 1.
Therefore, the display substrate 1 manufactured by the manufacturing method provided by the embodiment of the invention can realize the detection of the cracks around the display substrate 1 without manufacturing a special crack detection circuit, and increases the space for wiring in the edge area of the display substrate 1, thereby reducing the difficulty of wiring in the edge area of the display substrate 1 and well reducing the risk of the display substrate 1 causing defects. Moreover, the display substrate 1 manufactured by the manufacturing method provided by the embodiment of the invention can realize crack detection by using the original electrostatic discharge circuit 12 in the display substrate 1, and does not need to control the switching of the display substrate 1 between crack detection and display function detection, thereby well reducing the complexity of crack detection and enabling the crack detection of the display substrate 1 to be simpler, easier and more efficient.
In addition, the display substrate 1 manufactured by the manufacturing method provided by the embodiment of the invention can realize crack detection in a cell state, can also realize whether cracks are generated in a module manufacturing process stage after a module is formed, and can also realize simple, easy and efficient crack detection in the module state.
In some embodiments, when the first electrostatic discharge sub-circuit 123 provided in the above embodiments includes the first transistor T1, the step of manufacturing the first electrostatic discharge sub-circuit 123 may specifically include: through the same patterning process, the gate of the first transistor T1 and the crack detection line 13 connected to the gate are fabricated.
The specific manufacturing process of the first electrostatic discharge sub-circuit 123 and the second electrostatic discharge sub-circuit 124 will be described in detail with the display substrate 1 including the first electrostatic discharge sub-circuit 123 and the second electrostatic discharge sub-circuit 124, wherein the first electrostatic discharge sub-circuit 123 includes the first transistor T1, and the second electrostatic discharge sub-circuit 124 includes the second transistor T2.
As shown in fig. 6, the specific connection manner of the first transistor T1 and the second transistor T2 is the connection manner described in the embodiment of the display substrate 1, and the step of manufacturing the electrostatic discharge circuit 12 specifically includes:
step one, depositing a polysilicon (P-Si) film layer on a substrate, doping the P-Si film layer to determine a threshold voltage of a transistor to be formed, then patterning the doped P-Si film layer, specifically forming a photoresist on the P-Si film layer, exposing the photoresist by using a corresponding mask plate to form a photoresist reserved region and a photoresist removed region, wherein the photoresist reserved region corresponds to a region where an active film layer C corresponding to a first transistor T1 and a second transistor T2 is located, the photoresist removed region corresponds to other regions except the region where the active film layer C is located, removing the photoresist in the photoresist removed region by using a developing solution, etching the P-Si film layer in the photoresist reserved region, and stripping the photoresist in the photoresist reserved region, the active film layer C corresponding to the first and second transistors T1 and T2 is formed.
And secondly, manufacturing a first insulating layer (also called a gate insulating layer) on the side, opposite to the substrate, of the formed active layer, wherein the first insulating layer covers a first part and a second part of the active film layer, the first part is used as an active layer of the first transistor T1, and the second part is used as an active layer of the second transistor T2.
Step three, manufacturing a grid electrode of the first transistor T1, a grid electrode of the second transistor T2, a crack detection line 13 connected with the grid electrode of the first transistor T1, a first electrostatic discharge line 120 and a second electrostatic discharge line 121 on one side of the first insulating layer, which faces away from the substrate; the specific manufacturing process is as follows: depositing a first metal film on one side of the first insulating layer, which is opposite to the substrate, forming a photoresist on the surface of the first metal film, which is opposite to the substrate, exposing the photoresist by using a corresponding mask plate to form a photoresist reserved region and a photoresist removed region, wherein the photoresist reserved region corresponds to the gate of the first transistor T1, the gate of the second transistor T2, the crack detection line 13, the first electrostatic discharge line 120 and the second electrostatic discharge line 121, the photoresist removed region corresponds to other regions except for the regions where the gate of the first transistor T1, the gate of the second transistor T2, the crack detection line 13, the first electrostatic discharge line 120 and the second electrostatic discharge line 121 are located, developing the exposed photoresist by using a developing solution to remove the photoresist in the photoresist removed region, and removing the first metal film in the photoresist removed region by using an etching process, after the photoresist at the photoresist remaining region is stripped, the gate of the first transistor T1, the gate of the second transistor T2, the crack detection line 13, the first electrostatic discharge line 120, and the second electrostatic discharge line 121 are formed.
And fourthly, doping the active film layer by taking the first insulating layer, the gate of the first transistor T1 and the gate of the second transistor T2 as masks, wherein the specific doped part is the other part (defined as a third part B) except the first part and the second part in the active film layer, and the doping has the function of enabling the third part to have good conductivity.
And fifthly, sequentially manufacturing a second insulating layer and a dielectric layer on the gate of the first transistor T1, the gate of the second transistor T2 and the side, opposite to the substrate, of the crack detection line 13, and punching holes at corresponding positions.
And a sixth step of depositing and forming a second metal film, patterning the second metal film, and forming a first electrode and a second electrode of the first transistor T1, a first electrode and a second electrode of the second transistor T2, and conductive connection lines for connecting the transistors to the first electrostatic discharge line 120, the second electrostatic discharge line 121, and the data signal line 11, respectively.
When the display substrate 1 is manufactured by using the manufacturing method provided by the above embodiment, the crack detection line 13, the gate of each transistor, the first electrostatic discharge line 120, and the second electrostatic discharge line 121 can be simultaneously manufactured by one-time patterning process, so that an increase of a separate manufacturing process for manufacturing the crack detection line 13 is avoided, and the manufacturing cost of the display substrate 1 is better reduced.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the method embodiments, since they are substantially similar to the product embodiments, they are described simply, and reference may be made to the partial description of the product embodiments for relevant points.
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 invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is 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. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A display substrate comprising a pixel cell and a data signal line for writing a data voltage signal to the pixel cell, the display substrate further comprising an electrostatic discharge circuit, the electrostatic discharge circuit comprising:
a first electrostatic discharge line;
the first electrostatic discharge sub-circuit is respectively connected with the data signal line and the first electrostatic discharge line, connecting lines included in the first electrostatic discharge sub-circuit are multiplexed into crack detection lines, and the crack detection lines are located in a peripheral area surrounding a display area in the display substrate and extend along the edge of the display substrate; the first electrostatic discharge sub-circuit is used for: and when the crack detection line breaks in the detection period, the connection between the data signal line and the first electrostatic discharge line is conducted.
2. The display substrate of claim 1, wherein the first electrostatic discharge subcircuit comprises:
a first transistor, a first pole of which is connected to the data signal line, a second pole of which is connected to the first electrostatic discharge line, a gate of which is connected to a first end of the crack detection line, and a second end of the crack detection line is connected to the first electrostatic discharge line.
3. The display substrate according to claim 1 or 2, wherein the electrostatic discharge circuit comprises a plurality of electrostatic discharge sub-circuits, the crack detection lines in each electrostatic discharge sub-circuit are insulated from each other, and an orthographic projection of the crack detection lines in each electrostatic discharge sub-circuit on the substrate of the display substrate surrounds the display area.
4. The display substrate according to claim 3, wherein each of the electrostatic discharge sub-circuits includes crack detection lines, adjacent crack detection lines are arranged in different layers, and orthographic projections of adjacent portions of the adjacent crack detection lines on the substrate have an overlapping region.
5. The display substrate according to claim 1 or 2, wherein the electrostatic discharge circuit further comprises:
a second electrostatic discharge line;
a second electrostatic discharge sub-circuit connected to the data signal line and the second electrostatic discharge line, respectively, the second electrostatic discharge sub-circuit being configured to: discharging a second electrostatic charge generated on the data signal line to the second electrostatic discharge line.
6. The display substrate of claim 5, wherein the second electrostatic discharge subcircuit comprises:
and a second transistor, a first pole of which is connected to the data signal line, a second pole of which is connected to the second electrostatic discharge line, and a gate of which is connected to the first pole of the second transistor.
7. A display device comprising the display substrate according to any one of claims 1 to 6.
8. A crack detection method of a display substrate, which is applied to the display substrate according to any one of claims 1 to 6, the method comprising:
and in the detection period, when the multiplexed crack detection lines in the display substrate break, the first electrostatic discharge sub-circuit in the display substrate conducts the connection between the data signal lines and the first electrostatic discharge lines in the display substrate.
9. A method for manufacturing a display substrate according to any one of claims 1 to 6, the method comprising a step of manufacturing an electrostatic discharge circuit, wherein the step of manufacturing the electrostatic discharge circuit specifically comprises:
manufacturing a first electrostatic discharge line;
manufacturing a first electrostatic discharge sub-circuit which is respectively connected with a data signal line and the first electrostatic discharge line in the display substrate, wherein connecting lines included in the first electrostatic discharge sub-circuit are multiplexed into crack detection lines, and the crack detection lines are located in the peripheral area of the display substrate and extend along the edge of the display substrate; the first electrostatic discharge sub-circuit is used for: and when the crack detection line breaks in the detection period, the connection between the data signal line and the first electrostatic discharge line is conducted.
10. The method for manufacturing a display substrate according to claim 9, wherein when the first esd sub-circuit comprises a first transistor, the step of manufacturing the first esd sub-circuit specifically comprises:
and manufacturing a grid electrode of the first transistor and the crack detection line connected with the grid electrode through the same patterning process.
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| CN111025697B (en) * | 2019-12-16 | 2021-06-01 | 武汉华星光电技术有限公司 | Liquid crystal display panel and display device |
| CN111044578B (en) * | 2019-12-31 | 2022-10-28 | 厦门天马微电子有限公司 | Display panel, crack position positioning method thereof and display device |
| CN111276494B (en) * | 2020-02-11 | 2022-06-24 | 合肥鑫晟光电科技有限公司 | Array substrate, manufacturing method thereof, display panel and display device |
| CN113467140B (en) * | 2020-03-31 | 2022-06-07 | 荣耀终端有限公司 | Display screen, electronic equipment and crack detection method |
| CN114270526A (en) | 2020-04-15 | 2022-04-01 | 京东方科技集团股份有限公司 | Display substrate, display panel and display device |
| WO2021223080A1 (en) * | 2020-05-06 | 2021-11-11 | 京东方科技集团股份有限公司 | Display substrate and display device |
| CN111696459B (en) * | 2020-05-26 | 2023-10-20 | 京东方科技集团股份有限公司 | Detection module, crack detection method, display panel and display device |
| CN111739453B (en) * | 2020-06-28 | 2022-05-17 | 武汉天马微电子有限公司 | Display panel and display device |
| CN111863916B (en) * | 2020-07-29 | 2022-08-02 | 京东方科技集团股份有限公司 | Electrostatic protection circuit, display substrate and display device |
| WO2022087815A1 (en) * | 2020-10-27 | 2022-05-05 | 京东方科技集团股份有限公司 | Display substrate and crack detection method therefor, and display apparatus |
| CN112509467B (en) * | 2020-11-27 | 2022-03-08 | 合肥维信诺科技有限公司 | Display substrate, electrostatic discharge device and method |
| CN112378960A (en) * | 2020-12-14 | 2021-02-19 | 霸州市云谷电子科技有限公司 | Display substrate, display screen and crack detection method |
| CN112863410A (en) * | 2021-01-11 | 2021-05-28 | 京东方科技集团股份有限公司 | Display substrate, crack detection method thereof and display device |
| CN113284441A (en) * | 2021-05-18 | 2021-08-20 | 京东方科技集团股份有限公司 | Display module, fracture detection method and display device |
| CN115561571B (en) * | 2022-01-13 | 2023-12-08 | 深圳荣耀智能机器有限公司 | Crack detection circuit, system, integrated circuit and electronic equipment |
| CN114944111B (en) * | 2022-05-23 | 2023-12-05 | 京东方科技集团股份有限公司 | Display panel and display device |
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