Display substrate and detection method thereof, and display device

Abstract

A display substrate and a detection method and a display device, the display substrate comprising: a substrate (1), comprising a display area (AA) and a peripheral area surrounding the display area (AA); a plurality of sub-pixels (P), a plurality of data lines (2), located in the display area (AA); a first control signal line (4), a second control signal line (5), a crack detection line (D1), and at least one data detection line, all located in the peripheral area, and the crack detection line (D1) is arranged around the display area (AA); a plurality of display screen detection units (CT), located in the peripheral area, configured to transmit a detection signal provided by at least one data detection line to at least one of the plurality of data lines (2) according to a control signal provided by the first control signal line (4); and a plurality of crack detection units (PCD), located in the peripheral area, at least one of the plurality of crack detection units (PCD) being electrically connected to the crack detection line (D1), the second control signal line (5) and at least one of the plurality of data lines (2).

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display substrate and a detection method thereof, and a display device. Background Art

[0002] With the continuous innovation of display technology, flexible organic light-emitting diodes (OLED) have become the biggest hot spot in recent years and are being used more and more widely. Although flexible OLEDs have many advantages, the edges of flexible products are more prone to cracks, and these cracks will cause packaging failure or display abnormalities in subsequent processes. Therefore, it is very necessary to design a circuit for detecting cracks in flexible display panels and a detection method based on the circuit. Summary of the invention

[0003] A display substrate provided in an embodiment of the present disclosure includes:

[0004] A substrate, comprising a display area and a peripheral area surrounding the display area;

[0005] A plurality of sub-pixels are located in the display area;

[0006] a plurality of data lines, located in the display area and electrically connected to the plurality of sub-pixels;

[0007] A first control signal line, located in the peripheral area;

[0008] A second control signal line is located in the peripheral area;

[0009] A crack detection line is located in the peripheral area and is arranged around the display area;

[0010] at least one data detection line located in the peripheral area;

[0011] a plurality of display screen detection units, located in the peripheral area, at least one of the plurality of display screen detection units being electrically connected to the first control signal line, the at least one data detection line and at least one of the plurality of data lines, and being configured to transmit a detection signal provided by the at least one data detection line to at least one of the plurality of data lines according to a control signal provided by the first control signal line;

[0012] A plurality of crack detection units are located in the peripheral area, and at least one of the plurality of crack detection units is electrically connected to the crack detection line, the second control signal line, and at least one of the plurality of data lines.

[0013] Optionally, in the above-mentioned display substrate provided in the embodiment of the present disclosure, the plurality of data lines include a first data line, a second data line and a third data line, and at least one of the crack detection units is electrically connected to one of the first data line, the second data line and the third data line.

[0014] Optionally, in the above-mentioned display substrate provided by the embodiment of the present disclosure, it further includes a test line located in the peripheral area, and at least one of the crack detection units is electrically connected to the crack detection line, the test line, the second control signal line, the first data line, the second data line and the third data line;

[0015] The crack detection unit is further configured to transmit the test signal provided by the test line to at least one of the plurality of data lines according to the control signal provided by the second control signal line.

[0016] Optionally, in the above-mentioned display substrate provided by the embodiment of the present disclosure, the at least one data detection line includes a first data detection line, a second data detection line and a third data detection line, and at least one of the display screen detection units is electrically connected to one of the first data detection line, the second data detection line and the third data detection line;

[0017] The display screen detection unit is specifically configured to transmit the detection signals provided by the first data detection line, the second data detection line, and the third data detection line to the corresponding data lines according to the control signal provided by the first control signal line.

[0018] Optionally, in the above-mentioned display substrate provided in an embodiment of the present disclosure, at least one of the display screen detection units is electrically connected to the first data detection line, the second data detection line and the third data detection line.

[0019] Optionally, in the above-mentioned display substrate provided by the embodiment of the present disclosure, at least one of the display screen detection units includes a first transistor, a second transistor and a third transistor;

[0020] The control electrode of the first transistor, the control electrode of the second transistor and the control electrode of the third transistor are all electrically connected to the first control signal line;

[0021] The first electrode of the first transistor is electrically connected to the first data detection line, the first electrode of the second transistor is electrically connected to the second data detection line, and the first electrode of the third transistor is electrically connected to the third data detection line;

[0022] The second electrode of the first transistor, the second electrode of the second transistor and the second electrode of the third transistor are electrically connected to the corresponding data lines respectively.

[0023] Optionally, in the above-mentioned display substrate provided by the embodiment of the present disclosure, at least one of the crack detection units includes at least a fourth transistor, a fifth transistor and a sixth transistor;

[0024] The control electrode of the fourth transistor, the control electrode of the fifth transistor and the control electrode of the sixth transistor in each of the crack detection units are electrically connected to the second control signal line;

[0025] The first electrode of the fourth transistor, the first electrode of the fifth transistor and the first electrode of the sixth transistor in each of the crack detection units are electrically connected to the corresponding data line respectively;

[0026] The second electrode of the fifth transistor in at least one of the crack detection units is electrically connected to the crack detection line, and the second electrode of the fourth transistor and the second electrode of the sixth transistor are electrically connected to the test line; the second electrode of the fourth transistor, the second electrode of the fifth transistor and the second electrode of the sixth transistor in the remaining crack detection units are all electrically connected to the test line.

[0027] Optionally, in the above-mentioned display substrate provided in the embodiment of the present disclosure, it further includes a plurality of binding pads located in the peripheral area;

[0028] The plurality of display screen detection units are located at opposite sides of the plurality of binding pads, and the plurality of display screen detection units and the plurality of binding pads are located at opposite sides of the display area;

[0029] The plurality of crack detection units are located at opposite sides of the plurality of binding pads, and the plurality of crack detection units and the plurality of binding pads are located at opposite sides of the display area.

[0030] Optionally, in the above-mentioned display substrate provided in an embodiment of the present disclosure, the multiple crack detection units are arranged around the display area, the multiple display screen detection units are arranged around the display area, and the multiple crack detection units are located between the multiple display screen detection units and the display area.

[0031] Optionally, the display substrate provided in the embodiment of the present disclosure further includes a plurality of binding pads located in the peripheral area, and the crack detection line and the test line are led out from the same binding pad.

[0032] Optionally, in the above-mentioned display substrate provided in the embodiment of the present disclosure, the test line is led out from the binding pad and directly arranged around the display area, and the crack detection line is led out from the binding pad and arranged around the edge of the display substrate and around the display area.

[0033] Optionally, in the above-mentioned display substrate provided in an embodiment of the present disclosure, the second control signal line, the at least one data detection line and the first control signal line are all led out from the corresponding binding pads and are arranged around the display area.

[0034] Optionally, in the above-mentioned display substrate provided in the embodiment of the present disclosure, along the direction from the display area to the peripheral area, the at least one data detection line, the first control signal line, the second control signal line, the test line and the crack detection line are arranged in sequence.

[0035] Correspondingly, an embodiment of the present disclosure further provides a display device, comprising the above-mentioned display substrate provided by an embodiment of the present disclosure.

[0036] Accordingly, an embodiment of the present disclosure further provides a method for detecting a display substrate, comprising:

[0037] In the crack detection stage of the display substrate: the first control signal line receives a first level signal to control the display screen detection unit to be turned off; the second control signal line receives a second level signal to control the crack detection unit to be turned on; if the crack detection line is not broken, the detection signal on the crack detection line is transmitted to the corresponding data line through the crack detection unit, and is output to the light-emitting element in the sub-pixel connected to the data line through the data line, and the light-emitting element electrically connected to the data line is in a dark state; if the crack detection line is broken, the detection signal on the crack detection line cannot be transmitted to the light-emitting element in the sub-pixel connected to the data line, and the light-emitting element electrically connected to the data line emits light;

[0038] In the display screen detection stage: the first control signal line receives the second level signal to control the display screen detection unit to be turned on; the second control signal line receives the first level signal to control the crack detection unit to be turned off; the detection signal on the at least one data detection line is transmitted to the corresponding data line via the display screen detection unit, and the light-emitting element in the sub-pixel electrically connected to the data line emits light. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a top view structure of a portion of a film layer of a display substrate provided by an embodiment of the present disclosure;

[0040] Figure 2 A schematic diagram of a partial cross-sectional structure of a display substrate provided in an embodiment of the present disclosure;

[0041] Figure 3 A schematic diagram of a partial cross-sectional structure of another display substrate provided in an embodiment of the present disclosure;

[0042] Figure 4A flow chart of a method for detecting a display substrate provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0044] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. "Include" or "comprising" and other similar words used in the present disclosure mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Inside", "outside", "upper", "lower", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0045] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual proportions, and are only intended to illustrate the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0046] The display panel needs to be cut into the required size through a cutting process. Affected by the cutting process, some cracks are very likely to form on the edge area of ​​the display panel. During the subsequent processes and the use of the final product, the cracks are likely to expand into the interior of the display panel, affecting the normal display of the display panel. Therefore, the display panel needs to undergo crack detection (Panel Crack Detection, PCD) before leaving the factory; in addition, the display panel also needs to undergo display screen detection (Cell Test, CT) before leaving the factory. CT refers to the detection of whether the display panel can display a pure color picture. At present, PCD and CT are implemented using the same detection circuit. Due to the large difference in the resistance of the signal line during different detections, the screen brightness may be uneven, resulting in the problem of mutual interference in detection.

[0047] In view of this, the present disclosure provides a display substrate, such as Figure 1 As shown, including:

[0048] The substrate 1 includes a display area AA and a peripheral area surrounding the display area AA. The substrate 1 may be a flexible substrate or a rigid substrate. The middle portion of the substrate 1 is the display area AA for displaying, and the periphery of the display area AA is a peripheral area with other structures. The display area AA is used to display images.

[0049] A plurality of sub-pixels P are located in the display area AA. Figure 1 The middle display area AA only schematically shows some sub-pixels P; each sub-pixel P is provided with a pixel circuit, which is used to drive the sub-pixel P to emit light, and the pixel circuit may be a circuit structure such as 2T1C or 7T1C;

[0050] A plurality of data lines 2 are located in the display area AA and are electrically connected to a plurality of sub-pixels P. The data lines 2 are configured to provide data signals to the plurality of sub-pixels P. The plurality of sub-pixels P are defined by the plurality of data lines 2 and a plurality of gate lines (not shown) being insulated and crossed. The gate lines are configured to provide gate drive signals to the plurality of sub-pixels P. The data lines 2 are parallel to the column direction, and each data line 2 is electrically connected to a column of sub-pixels P. The gate lines are parallel to the row direction, and each gate line is electrically connected to a row of sub-pixels P.

[0051] The first control signal line 4 is located in the peripheral area and is arranged around the display area AA;

[0052] The second control signal line 5 is located in the peripheral area, is arranged around the display area AA, and is located on a side of the first control signal line 4 away from the display area AA;

[0053] The crack detection line D1 is located in the peripheral area and is arranged around the display area AA;

[0054] At least one data detection line is located in the peripheral area and is arranged around the display area AA; specifically, in the embodiment of the present invention, Figure 1 Take three data detection lines as an example for explanation, namely a first data detection line CTDR, a second data detection line CTDG and a third data detection line CTDB, which will be described in detail later;

[0055] A plurality of display screen detection units CT are located in the peripheral area, at least one of the plurality of display screen detection units CT is electrically connected to the first control signal line 4, at least one data detection line (CTDR, CTDG or CTDB) and at least one of the plurality of data lines 2, and is configured to transmit a detection signal provided by at least one data detection line (CTDR, CTDG or CTDB) to at least one of the plurality of data lines 2 according to a control signal provided by the first control signal line 4;

[0056] Multiple crack detection units PCD are located in the peripheral area, and at least one of the multiple crack detection units PCD is electrically connected to the crack detection line D1, the second control signal line 5 and at least one of the multiple data lines 2; when performing crack detection, the crack detection unit PCD is configured to transmit the detection signal provided by the crack detection line D1 to at least one of the multiple data lines 2 according to the control signal provided by the second control signal line 5.

[0057] Specifically, in the crack detection stage, the display screen detection unit CT is controlled to be closed, and the crack detection unit PCD is controlled to work. Since the crack detection line D1 is arranged around the display area AA, when the display panel is affected by the cutting process and cracks are generated at the cutting edge, the crack detection line D1 will be broken, and the detection signal on the crack detection line D1 cannot be transmitted to the crack detection unit PCD, and the detection signal on the crack detection line D1 cannot be transmitted to the light-emitting element in the sub-pixel P connected to the data line 2, and the light-emitting element electrically connected to the data line 2 emits light, and a bright line appears in the display area AA; if the crack detection line D1 is not broken, the detection signal on the crack detection line D1 is transmitted to the corresponding data line 2 through the crack detection unit PCD, and is output to the light-emitting element in the sub-pixel P connected to the data line 2 through the data line 2, and the light-emitting element electrically connected to the data line 2 is in a dark state; therefore, at least one of the multiple crack detection units PCD is electrically connected to the crack detection line D1, and the remaining crack detection units PCD are not electrically connected to the crack detection line D1, so that it is possible to detect whether a crack occurs at the edge of the display substrate. When a plurality of crack detection units PCD are electrically connected to the crack detection line D1 , if the crack detection line D1 is broken, a plurality of bright lines will appear in the display area AA.

[0058] It should be noted that the embodiments of the present disclosure Figure 1 The example of two crack detection units PCD electrically connected to the crack detection line D1 is used for explanation. Figure 1 For the purpose of illustrative illustration only, only some sub-pixels are shown.

[0059] Specifically, in the display screen single body detection stage, the display screen detection unit CT is controlled to work, and the crack detection unit PCD is controlled to be turned off. The detection signals on the first data detection line CTDR, the second data detection line CTDG and the third data detection line CTDB are respectively transmitted to the corresponding data line 2 via the display screen detection unit CT, and the light-emitting element in the sub-pixel P electrically connected to the data line 2 emits light, thereby performing pure color picture detection.

[0060] It should be noted that in the embodiment of the present disclosure, at least one crack detection unit PCD is electrically connected to the crack detection line D1 instead of all crack detection units PCD being electrically connected to the crack detection line D1. This is because when all crack detection units PCD are electrically connected to the crack detection line D1, if the crack detection line D1 is broken, all the pixels in the display area AA will be lit, and the bright lines in the display area AA caused by other reasons cannot be detected, affecting the reliability of the display substrate. Therefore, in the embodiment of the present disclosure, at least one of the multiple crack detection units PCD only needs to be electrically connected to the crack detection line D1.

[0061] The above-mentioned display substrate provided by the embodiment of the present disclosure separates the crack detection unit PCD and the display screen detection unit CT so as not to interfere with each other and affect the tests of different sections. In addition, when the driver chip IC does not support bright line detection, a probe can be used to access the detection signal from the outside, that is, bright line detection can still be performed on the module end.

[0062] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1 , Figure 2 and Figure 3 As shown, Figure 2 for Figure 1 Schematic diagram of the film structure of PCD and CT in the dotted box on the left. Figure 3 for Figure 1 Schematic diagram of the film structure of PCD and CT in the solid line frame on the right, multiple crack detection units PCD are arranged around the display area AA, multiple display screen detection units CT are arranged around the display area AA, and multiple crack detection units PCD are located between multiple display screen detection units CT and the display area AA. In this way, multiple crack detection units PCD and multiple display screen detection units CT can be independently arranged around the display area AA without affecting each other. Figure 3 and Figure 2 The difference is Figure 3 The crack detection unit PCD in the circuit should be electrically connected to the crack detection line D1. Figure 2 The crack detection unit PCD in is not connected to the crack detection line D1.

[0063] It should be noted that Figure 1 is the equivalent circuit diagram of equivalent PCD and CT, Figure 2 and Figure 3 This is a schematic diagram of the layout of PCD and CT. Figure 2 and Figure 3 The layout shall prevail. Figure 2 and Figure 3The example in which multiple crack detection units PCD are located between multiple display screen detection units CT and the display area AA is used for illustration; of course, in specific production, multiple display screen detection units CT may also be located between multiple crack detection units PCD and the display area AA. Figure 1 It is only a schematic diagram of the equivalent circuit and not a layout for film production.

[0064] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1-Figure 3 As shown, the plurality of data lines 2 include a first data line 201, a second data line 202, and a third data line 203, and at least one crack detection unit PCD is electrically connected to one of the first data line 201, the second data line 202, and the third data line 203. For example, the crack detection line D1 corresponds to the second data line 202, so that when the crack detection line D1 is broken, the second data line 202 corresponding to the crack detection line D1 cannot receive the detection signal on the crack detection line D1, and the sub-pixel P column corresponding to the second data line 202 generates a bright line, while the sub-pixel P column corresponding to the first data line 201 and the third data line 203 is in a dark state, so that crack detection can be performed.

[0065] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1-Figure 3 As shown, it also includes a test line D2 located in the peripheral area, the test line D2 is located between the crack detection line D1 and the second control signal line 5, at least one crack detection unit PCD is electrically connected to the crack detection line D1, the test line D2, the second control signal line 5, the first data line 201, the second data line 202 and the third data line 203; the remaining crack detection units PCD are electrically connected to the test line D2, the second control signal line 5, the first data line 201, the second data line 202 and the third data line 203.

[0066] The crack detection unit PCD is further configured to transmit the test signal provided by the test line D2 to at least one of the plurality of data lines 2 according to the control signal provided by the second control signal line 5. For example, the crack detection line D1 corresponds to the second data line 202, so that when the crack detection line D1 is broken, the second data line 202 corresponding to the crack detection line D1 cannot receive the detection signal on the crack detection line D1, and the sub-pixel P column corresponding to the second data line 202 generates a bright line, while the first data line 201 and the third data line 203 receive the test signal on the test line D1, and the test signal controls the sub-pixel P column corresponding to the first data line 201 and the third data line 203 to be in a dark state, so that crack detection can be performed.

[0067] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1-Figure 3As shown, at least one data detection line includes a first data detection line CTDR, a second data detection line CTDG and a third data detection line CTDB, the first data detection line CTDR is closest to the display area AA, the second data detection line CTDG is located between the crack detection line D1 and the first data detection line CTDR, and the third data detection line CTDB is located between the crack detection line D1 and the second data detection line CTDG; at least one display screen detection unit CT is electrically connected to one of the first data detection line CTDR, the second data detection line CTDG and the third data detection line CTDB;

[0068] The display screen detection unit CT is specifically configured to transmit the detection signals provided by the first data detection line CTDR, the second data detection line CTDG and the third data detection line CTDB to the corresponding data line 2 according to the control signal provided by the first control signal line 4. In this way, when the display screen unit is detected, the crack detection unit PCD is controlled not to work, and the display screen detection unit CT is controlled to work by the control signal provided by the first control signal line 4, so that the detection signals provided by the first data detection line CTDR, the second data detection line CTDG and the third data detection line CTDB are transmitted to the corresponding data line 2, thereby realizing the detection of pure color pictures.

[0069] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1-Figure 3 As shown, at least one display screen detection unit CT is electrically connected to the first data detection line CTDR, the second data detection line CTDG and the third data detection line CTDB. In this way, when performing pure color image detection, the display panel can be controlled to display a red image through the detection signal provided by the first data detection line CTDR, the display panel can be controlled to display a green image through the detection signal provided by the second data detection line CTDG, and the display panel can be controlled to display a blue image through the detection signal provided by the third data detection line CTDB.

[0070] It should be noted that the embodiment of the present invention is described by taking the example that multiple display screen detection units CT are electrically connected to corresponding data detection lines (first data detection line CTDR, second data detection line CTDG and third data detection line CTDB), which can make the detection effect of pure color images better.

[0071] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1As shown, it also includes a plurality of binding pads 3 located in the peripheral area; a plurality of display screen detection units CT are located on the opposite side of the plurality of binding pads 3, that is, the plurality of display screen detection units CT and the plurality of binding pads 3 are located on the opposite side of the display area AA; a plurality of crack detection units PCD are located on the opposite side of the plurality of binding pads 3, that is, the plurality of crack detection units PCD and the plurality of binding pads 3 are located on the opposite side of the display area AA. Specifically, the binding pad 3 is a structure provided on the substrate 1 for obtaining a signal, and specifically can be a sheet-like one or more metal layers provided on the substrate 1; for example, the binding pad 3 can be a structure (such as a Pin) for bonding (Bonding) with a flexible circuit board (FPC) or a driver chip (IC), so as to obtain a signal from the flexible circuit board or the driver chip; and at least part of the binding pad 3 is used to provide a data signal to the data line 2, that is, at least part of the binding pad 3 is used to provide a data signal to the data line 2 when displaying, so as to control the sub-pixel P connected to the data line 2 to display the required content.

[0072] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1 As shown, it also includes a plurality of binding pads 3 located in the peripheral area, and the crack detection line D1 and the test line D2 are led out from the same binding pad 3 .

[0073] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1 As shown, the test line D2 is led out from the binding pad 3 and then directly arranged around the display area AA, and the crack detection line D1 is led out from the binding pad 3 and then arranged around the display area AA. In this way, when the edge of the display substrate is cracked due to cutting, the crack detection line D1 arranged around the display area will be broken, and the detection signal on the crack detection line D1 cannot be transmitted to the display area AA, so that a bright line will appear in the display area AA.

[0074] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1 As shown, the second control signal line 5, at least one data detection line (a first data detection line CTDR, a second data detection line CTDG and a third data detection line CTDB) and the first control signal line 4 are all led out from their respective corresponding binding pads 3 and are arranged around the display area AA. The positional relationship of these signal lines has been described in the previous content and will not be repeated here.

[0075] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 2 and Figure 3As shown, along the direction from the display area AA to the peripheral area, at least one data detection line (the first data detection line CTDR, the second data detection line CTDG and the third data detection line CTDB), the first control signal line 4, the second control signal line 5, the test line D2 and the crack detection line D1 are arranged in sequence. The positional relationship of these signal lines has been described in the above content and will not be repeated here. Of course, other wiring arrangements can also be used in specific implementations, all of which belong to the scope of protection of the present invention.

[0076] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1-Figure 3 As shown, at least one display screen detection unit CT at least includes a first transistor 10, a second transistor 20 and a third transistor 30;

[0077] The control electrode 11 of the first transistor 10, the control electrode 21 of the second transistor 20 and the control electrode 31 of the third transistor 30 are all electrically connected to the first control signal line 4;

[0078] The first electrode 12 of the first transistor 10 is electrically connected to the first data detection line CTDR, the first electrode 22 of the second transistor 20 is electrically connected to the second data detection line CTDG, and the first electrodes 32 of all the third transistors 30 are electrically connected to the third data detection line CTDB;

[0079] The second electrode 13 of the first transistor 10 , the second electrode 23 of the second transistor 20 , and the second electrode 33 of the third transistor 30 are electrically connected to the corresponding data lines 2 , respectively.

[0080] In a specific implementation, in the above-mentioned display substrate provided in the embodiment of the present disclosure, if Figure 1-Figure 3 As shown, at least one crack detection unit PCD comprises at least a fourth transistor 40, a fifth transistor 50 and a sixth transistor 60;

[0081] The control electrode 41 of the fourth transistor 40, the control electrode of the fifth transistor 50 and the control electrode 51 of the sixth transistor 60 in each crack detection unit PCD are all electrically connected to the second control signal line 5;

[0082] The first electrode 42 of the fourth transistor 40, the first electrode 52 of the fifth transistor 50 and the first electrode 62 of the sixth transistor 60 in each crack detection unit PCD are electrically connected to the corresponding data line 2 respectively;

[0083] The second electrode 53 of the fifth transistor 50 in at least one crack detection unit PCD is electrically connected to the crack detection line D1, the second electrode 43 of the fourth transistor 40 and the second electrode 63 of the sixth transistor 60 are electrically connected to the test line D2, Figure 1It is shown that the second electrode 53 of the fifth transistor 50 in two crack detection units PCD is electrically connected to the crack detection line D1; the second electrode 43 of the fourth transistor 40, the second electrode 53 of the fifth transistor 50 and the second electrode 63 of the sixth transistor 60 in the remaining crack detection units PCD are all electrically connected to the test line D2.

[0084] Specifically, all switch transistors are P-type switch transistors. Figure 2 It is a schematic diagram of the layout during CT detection. During CT detection, the first control signal line 4 provides a low-level signal, and the transistor of the display screen detection unit CT is turned on. The second control signal line 5 provides a high-level signal, and the transistor of the crack detection unit PCD is turned off, which does not affect the CT detection. Figure 3 This is a schematic diagram of the layout of the PCD detection. When performing crack detection, that is, bright line detection, the first control signal line 4 provides a high-level signal, and the transistor of the display screen detection unit CT is turned off. The second control signal line 5 provides a low-level signal, and the transistor of the crack detection unit PCD is turned on. When a crack occurs at the edge of the screen, Figure 2 The signal on the test line D2 output by the crack detection unit PCD makes the sub-pixel controlled by it dark state. Figure 3 The sub-pixel (R) and sub-pixel (B) controlled by the crack detection unit PCD are controlled to be dark by the test signal on the test line D2, and the sub-pixel (G) is controlled to emit light by the detection signal on the crack detection line D1, so when a crack occurs on the edge of the screen, a clearly visible green line will appear. During the module-side detection, that is, the stage of binding the driver chip IC, all signals are input by the module-side IC.

[0085] It should be noted that if Figure 1-Figure 3 As shown, the sub-pixel corresponding to the second transistor 20 electrically connected to the second data detection line CTDG is a green sub-pixel (G), and the first electrode 52 of the fifth transistor 50 electrically connected to the crack detection line D1 is electrically connected to the green sub-pixel (G) column, that is, when a crack appears, a green bright line will appear in the display area AA. The crack detection line D1 is electrically connected to the green sub-pixel (G) column because the human eye is more sensitive to green. Of course, the first electrode of the fifth transistor 50 electrically connected to the crack detection line D1 in the crack detection unit PCD can also be electrically connected to the red sub-pixel (R) column or the blue sub-pixel (B) column.

[0086] Therefore, the display substrate provided in the embodiment of the present disclosure separates the PCD and CT units so as not to interfere with each other, and supports PCD for bright line detection at the module end.

[0087] In the display substrate provided in the embodiment of the present disclosure, the crack detection unit PCD and the display screen detection unit CT are two independent structures located in the same unit, and the crack detection and the pure color image detection do not interfere with each other. In specific implementation, in the display substrate provided in the embodiment of the present disclosure, if Figure 1 As shown, the crack detection line D1 and the test line D2 are led out from the same binding pad 3, that is, the crack detection line D1 and the test line D2 are the same signal. For example, the test line D2 is directly routed into the detection unit after being output by the driver chip IC in the binding area at the module end, and the crack detection line D1 is output by the driver chip IC in the binding area and then enters the detection unit after winding at the edge of the display substrate. During detection, only the data signals of a few columns of sub-pixels P are controlled and input by the crack detection unit PCD, and the data signals of the remaining columns of sub-pixels are all controlled and input by the display detection unit CT.

[0088] Specifically, each of the above transistors is a thin film transistor (TFT). If the first electrode of the thin film transistor is the source of the thin film transistor, the second electrode of the transistor is the drain of the thin film transistor; if the first electrode of the transistor is the drain of the thin film transistor, the second electrode of the transistor is the source of the thin film transistor.

[0089] Specifically, Figure 1 As shown, the first transistor to the sixth transistor are all P-type transistors, and of course, they can also all be N-type transistors.

[0090] Those skilled in the art will appreciate that the embodiments of the present disclosure Figure 1 The provided crack detection unit PCD and display screen detection unit CT are an example. When each transistor is a P-type transistor or an N-type transistor or the first pole and the second pole of each transistor are different poles of the transistor, the electrical connection method of each element in the crack detection unit PCD and the display screen detection unit CT provided in the embodiment of the present disclosure can be adaptively adjusted, and the adaptively adjusted electrical connection method still falls within the protection scope of the embodiment of the present disclosure.

[0091] Based on the same inventive concept, the embodiment of the present disclosure also provides a method for detecting the above-mentioned display substrate, such as Figure 4 As shown, including:

[0092] S401, in the crack detection stage of the display substrate: the first control signal line receives a first level signal to control the display screen detection unit to be turned off; the second control signal line receives a second level signal to control the crack detection unit to be turned on; if the crack detection line is not broken, the detection signal on the crack detection line is transmitted to the corresponding data line through the crack detection unit, and is output to the light-emitting element in the sub-pixel connected to the data line through the data line, and the light-emitting element electrically connected to the data line is in a dark state; if the crack detection line is broken, the detection signal on the crack detection line cannot be transmitted to the light-emitting element in the sub-pixel connected to the data line, and the light-emitting element electrically connected to the data line emits light;

[0093] S402, in the display screen detection stage: the first control signal line receives the second level signal to control the display screen detection unit to be turned on; the second control signal line receives the first level signal to control the crack detection unit to be turned off; the detection signal on at least one data detection line is transmitted to the corresponding data line via the display screen detection unit, and the light-emitting element in the sub-pixel electrically connected to the data line emits light.

[0094] The detection method for the above-mentioned display substrate provided by the embodiment of the present disclosure separates the crack detection unit and the display screen detection unit so as not to interfere with each other and affect the testing of different sections. In addition, when the driving chip does not support bright line detection, a probe can be used to access the detection signal from the outside, that is, bright line detection can still be performed on the module end.

[0095] Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the above-mentioned display substrate provided in an embodiment of the present invention. The display device can be: a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function. The implementation of the display device can refer to the above-mentioned embodiment of the display substrate, and the repeated parts will not be repeated. The other essential components of the display device should be understood by ordinary technicians in the field, and will not be repeated here, nor should they be used as a limitation to the present disclosure.

[0096] In a specific implementation, the display device provided in the embodiment of the present disclosure may be a wearable display product such as a watch.

[0097] The above-mentioned display substrate and its detection method and display device provided by the embodiments of the present disclosure, by separating the crack detection unit PCD and the display screen detection unit CT, do not interfere with each other and do not affect the tests of different sections; in addition, when the driver chip IC does not support bright line detection, a probe can be used to access the detection signal from the outside, that is, bright line detection can still be performed on the module end.

[0098] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present disclosure.

[0099] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if these modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

1. A display substrate, wherein: include: A substrate, comprising a display area and a peripheral area surrounding the display area; A plurality of sub-pixels are located in the display area; a plurality of data lines, located in the display area and electrically connected to the plurality of sub-pixels; A first control signal line, located in the peripheral area; A second control signal line is located in the peripheral area; A crack detection line is located in the peripheral area and is arranged around the display area; at least one data detection line located in the peripheral area; a plurality of display screen detection units, located in the peripheral area, at least one of the plurality of display screen detection units being electrically connected to the first control signal line, the at least one data detection line and at least one of the plurality of data lines, and being configured to transmit a detection signal provided by the at least one data detection line to at least one of the plurality of data lines according to a control signal provided by the first control signal line; a plurality of crack detection units located in the peripheral area, at least one of the plurality of crack detection units being electrically connected to the crack detection line, the second control signal line, and at least one of the plurality of data lines; The plurality of data lines include a first data line, a second data line and a third data line, and at least one of the crack detection units is electrically connected to one of the first data line, the second data line and the third data line; Also comprising a test line located in the peripheral area, at least one of the crack detection units is electrically connected to the crack detection line, the test line, the second control signal line, the first data line, the second data line and the third data line; The crack detection unit is further configured to transmit the test signal provided by the test line to at least one of the plurality of data lines according to the control signal provided by the second control signal line; At least one of the crack detection units includes at least a fourth transistor, a fifth transistor and a sixth transistor; The control electrode of the fourth transistor, the control electrode of the fifth transistor and the control electrode of the sixth transistor are all electrically connected to the second control signal line; The first electrode of the fourth transistor, the first electrode of the fifth transistor and the first electrode of the sixth transistor are electrically connected to the corresponding data lines respectively; The second electrode of the fifth transistor in at least one of the crack detection units is electrically connected to the crack detection line, and the second electrode of the fourth transistor and the second electrode of the sixth transistor are electrically connected to the test line; The second electrode of the fourth transistor, the second electrode of the fifth transistor and the second electrode of the sixth transistor in the remaining crack detection units are all electrically connected to the test line.

2. The display substrate according to claim 1, wherein: The at least one data detection line includes a first data detection line, a second data detection line and a third data detection line, and at least one of the display screen detection units is electrically connected to one of the first data detection line, the second data detection line and the third data detection line; The display screen detection unit is configured to transmit detection signals provided by the first data detection line, the second data detection line, and the third data detection line to the corresponding data lines according to the control signal provided by the first control signal line.

3. The display substrate according to claim 2, wherein: At least one of the display screen detection units is electrically connected to the first data detection line, the second data detection line, and the third data detection line.

4. The display substrate according to claim 3, wherein: At least one of the display screen detection units includes a first transistor, a second transistor and a third transistor; The control electrode of the first transistor, the control electrode of the second transistor and the control electrode of the third transistor are all electrically connected to the first control signal line; The first electrode of the first transistor is electrically connected to the first data detection line, the first electrode of the second transistor is electrically connected to the second data detection line, and the first electrode of the third transistor is electrically connected to the third data detection line; The second electrode of the first transistor, the second electrode of the second transistor and the second electrode of the third transistor are electrically connected to the corresponding data lines respectively.

5. The display substrate according to any one of claims 1 to 4, wherein: Also included are a plurality of bonding pads located in the peripheral region; The plurality of display screen detection units are located at opposite sides of the plurality of binding pads, and the plurality of display screen detection units and the plurality of binding pads are located at opposite sides of the display area; The plurality of crack detection units are located at opposite sides of the plurality of binding pads, and the plurality of crack detection units and the plurality of binding pads are located at opposite sides of the display area.

6. The display substrate according to claim 5, wherein: The plurality of crack detection units are arranged around the display area, the plurality of display screen detection units are arranged around the display area, and the plurality of crack detection units are located between the plurality of display screen detection units and the display area.

7. The display substrate according to claim 1, wherein: It also includes a plurality of binding pads located in the peripheral area, and the crack detection line and the test line are led out from the same binding pad.

8. The display substrate according to claim 7, wherein: The test line is led out from the binding pad and arranged around the display area. The crack detection line is led out from the binding pad and arranged around the display area along the edge of the display substrate.

9. The display substrate according to claim 5, wherein: The second control signal line, the at least one data detection line and the first control signal line are all led out from the corresponding binding pads and are arranged around the display area.

10. The display substrate according to claim 1, wherein: Along the direction from the display area to the peripheral area, the at least one data detection line, the first control signal line, the second control signal line, the test line and the crack detection line are arranged in sequence.

11. A display device, wherein: Comprising the display substrate as described in any one of claims 1-10.

12. A method for detecting a display substrate according to any one of claims 1 to 10, wherein: include: In the display substrate crack detection stage: the first control signal line receives a first level signal to control the display screen detection unit to be turned off; The second control signal line receives a second level signal to control the crack detection unit to be turned on; if the crack detection line is not broken, the detection signal on the crack detection line is transmitted to the corresponding data line through the crack detection unit, and is output to the light-emitting element in the sub-pixel connected to the data line through the data line, and the light-emitting element electrically connected to the data line is in a dark state; if the crack detection line is broken, the detection signal on the crack detection line cannot be transmitted to the light-emitting element in the sub-pixel connected to the data line, and the light-emitting element electrically connected to the data line emits light; In the display screen detection stage: the first control signal line receives the second level signal to control the display screen detection unit to be turned on; The second control signal line receives the first level signal to control the crack detection unit to be turned off; the detection signal on the at least one data detection line is transmitted to the corresponding data line via the display screen detection unit, and the light-emitting element in the sub-pixel electrically connected to the data line emits light.

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