CN113487990A - Crack detection circuit, display panel, terminal device and crack detection method - Google Patents
Crack detection circuit, display panel, terminal device and crack detection method Download PDFInfo
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- CN113487990A CN113487990A CN202110738316.0A CN202110738316A CN113487990A CN 113487990 A CN113487990 A CN 113487990A CN 202110738316 A CN202110738316 A CN 202110738316A CN 113487990 A CN113487990 A CN 113487990A
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Abstract
The application provides a crack detection circuit, a display panel, a terminal device and a crack detection method, wherein the crack detection circuit is provided with a detection circuit and a control module connected with the detection circuit, the detection circuit is connected with at least one pixel driving circuit on the display panel, and the control module is used for transmitting a first signal to the detection circuit when the crack detection is carried out on the display panel; the light emitting condition of the pixel driving circuit is different under the conditions that the display panel has cracks and does not have cracks, so that whether the display panel has cracks or not can be judged by combining the light emitting condition of the pixel driving circuit. The crack detection circuit is used for crack detection after each process section and module finished product, so that resource waste caused by the fact that a display panel with cracks is mistakenly used as a qualified product to be continuously processed subsequently can be avoided.
Description
Technical Field
The application relates to the field of display screens, in particular to a crack detection circuit, a display panel, a terminal device and a crack detection method.
Background
The display panel generally includes a camera via region, a package region, and a display region. The method comprises the steps of punching a hole in a packaging area, wherein the punching comprises Laser Lift-off (LLO), cutting, attaching and other process sections, cracks may occur in the packaging area, and if the packaging area has cracks, water vapor and oxygen may enter an organic light emitting layer, so that the organic light emitting layer cannot normally emit light, for example, black spots occur. The prior art does not currently provide a corresponding crack detection method.
Disclosure of Invention
The application provides a crack detection circuit, a display panel, a terminal device and a crack detection method, which are used for detecting whether cracks exist in the display panel.
In a first aspect, the present application provides a crack detection circuit for detecting a display panel, the crack detection circuit comprising: the display panel comprises a detection circuit and a control module connected with the detection circuit, wherein the detection circuit is connected with at least one pixel driving circuit on the display panel, and the control module is used for transmitting a first signal to the detection circuit when crack detection is carried out on the display panel; when the display panel has no crack, the detection circuit is used for transmitting the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit emits abnormal bright light under the influence of the first signal; when the display panel has a crack, the detection circuit cannot transmit the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can normally emit light.
Optionally, the first end of the control module is connected to the first signal, the control end of the control module is connected to the crack detection signal, and the second end of the control module is connected to the detection line.
Optionally, the detection line includes at least one detection node, and for each detection node, the detection node is connected to a first pixel driving circuit, and the first pixel driving circuit is a pixel driving circuit that is in the same row as the detection node and in the same side as the detection node.
Optionally, the first pixel driving circuit includes a light emission compensation module, and the detection node is connected to the light emission compensation module;
when no crack exists at the position corresponding to the detection node on the display panel, the detection node is used for transmitting the first signal to the light-emitting compensation module, so that the light-emitting compensation module cannot perform light-emitting compensation under the influence of the first signal, and the first pixel driving circuit emits abnormal bright light; when a crack exists at a position corresponding to the detection node on the display panel, the detection node cannot transmit the first signal to the light-emitting compensation module, so that the at least one pixel driving circuit can normally emit light.
In a second aspect, the present application provides a display panel comprising: the crack detection circuit comprises a camera through hole area, a packaging area, a display area and the crack detection circuit, wherein the packaging area is arranged around the camera through hole area, the display area is arranged around the packaging area, the camera through hole area is used for a camera to collect images, the packaging area is used for preventing the side edge of an organic light emitting layer of the display area from being exposed in the air, and the crack detection circuit is arranged in the packaging area and used for performing crack detection on the packaging area.
Optionally, the display area includes pixel driving circuits arranged in an array, and the detection line is connected to at least one of the pixel driving circuits arranged in the array;
when the packaging area has no crack, the detection circuit is used for transmitting the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit emits abnormal bright light under the influence of the first signal; when the packaging area has cracks, the detection circuit cannot transmit the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can normally emit light.
In a third aspect, the present application provides a terminal device comprising the display panel provided in the second aspect.
In a fourth aspect, the present application provides a crack detection method applied to the crack detection circuit provided in the first aspect, the method including:
when crack detection is carried out on the display panel, the control module transmits a first signal to the detection circuit;
when the display panel has no crack, the detection circuit transmits the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit emits abnormal bright light under the influence of the first signal; when the display panel has a crack, the detection circuit cannot transmit the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can normally emit light.
Optionally, the transmitting, by the control module, the first signal to the detection line includes:
the control module is conducted under the control of the crack detection signal, so that the first signal connected with the first end of the control module is transmitted to the detection line.
The crack detection circuit is provided with a detection circuit and a control module connected with the detection circuit, the detection circuit is connected with at least one pixel driving circuit on the display panel, and the control module is used for transmitting a first signal to the detection circuit when the crack detection is carried out on the display panel; the light emitting condition of the pixel driving circuit is different under the conditions that the display panel has cracks and does not have cracks, so that whether the display panel has cracks or not can be judged by combining the light emitting condition of the pixel driving circuit. The crack detection circuit is used for crack detection after each process section and module finished product, so that resource waste caused by the fact that a display panel with cracks is mistakenly used as a qualified product to be continuously processed subsequently can be avoided.
Drawings
FIG. 1 is a schematic diagram of a crack detection circuit provided herein;
FIG. 2 is a schematic diagram of the detection line provided herein;
FIG. 3 is another schematic diagram of a crack detection circuit provided herein;
fig. 4 is a structural diagram of a 7T1C pixel driving circuit provided in the present application;
FIG. 5 is a timing diagram provided herein;
FIG. 6 is a schematic diagram of the connection between the detection node and the first pixel driving circuit provided in the present application;
fig. 7 is a schematic view of a display panel provided in the present application;
FIG. 8 is a flowchart of a first embodiment of a crack detection method provided herein;
fig. 9 is a flowchart of a second embodiment of a crack detection method provided in the present application.
Description of reference numerals:
10: a camera through hole area;
11: a packaging region;
12: a display area;
131: detecting a line;
132: a control module;
133: and detecting lines.
Detailed Description
To make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application, and it is obvious that the described embodiments are some, but not all embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, it is to be construed that "at least one" means one or more and "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "is a relationship generally indicating that the former and latter associated objects are an" or ". "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a alone, b alone, c alone, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.
The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that the application may employ. In the present application, directional terms such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", and the like are merely referring to the directions of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and understanding, and is in no way limiting. In the drawings, elements having similar structures are denoted by the same reference numerals.
Due to the fact that holes are formed in the display panel and the like, cracks may exist in the display panel, and the cracks need to be detected after each process section and module finished products, so that resource waste caused by the fact that the display panel with the cracks is mistakenly used as a qualified product to be continuously processed subsequently is avoided. The prior art does not provide a corresponding crack detection method at present.
To this end, the present application provides a crack detection circuit, which can be used to detect whether a crack exists in a display panel, and the following detailed description is provided for a specific implementation scheme of the present application with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a crack detection circuit provided in the present application. Referring to fig. 1, the crack detection circuit includes: a detection line 131 and a control module 132 connected to the detection line 131. The detection line 131 is connected to at least one pixel driving circuit on the display panel, and the control module 132 is configured to transmit a first signal to the detection line 131 when performing crack detection on the display panel.
In a possible implementation manner, in the area to be detected, a metal trace indicated by a solid line in fig. 1 may be formed by a Ti/Al/Ti three-layer metal through processes such as exposure, development, and the like, and the metal trace may serve as the detection line 131. The position of the area to be detected with the crack cannot form the metal wiring through the process, namely, the metal wiring is interrupted at the position of the area to be detected with the crack.
It should be noted that: the shape of the trace shown in fig. 1 is only an example, and other shapes can be designed according to actual requirements, which is not limited in this application.
In a possible implementation manner, the control module 132 includes a first switch tube, a first end of the control module 132 is an input end of the first switch tube, a second end of the control module 132 is an output end of the first switch tube, and a control end of the control module 132 is a control end of the first switch tube. The input end of the first switch tube is connected with a first signal, the control end of the first switch tube is connected with a Panel Crack Detection (PCD) signal, and the output end of the first switch tube is connected with a detection line 131. Referring to fig. 1, the first signal may be a VGH signal, and the VGH signal is a high-level direct current signal. In the VGH signal, V represents Voltage, G represents gate, and H represents High.
In one possible implementation, referring to fig. 2, the control terminal of the first switch tube may be connected to an Integrated Circuit (IC) through a screen edge detection line 133, and the IC sends a PCD signal to the first switch tube through the detection line 133. When crack detection needs to be performed on the display panel, the IC sends a PCD signal to the first switch tube, the PCD signal may be a voltage signal of-7V, and the first switch tube is turned on after receiving the PCD signal, so that the VGH signal may be transmitted to the detection line 131 through the first switch tube.
The crack detection principle is described below:
when crack detection is needed, the IC sends a PCD signal to the first switch tube, the first switch tube is turned on, the VGH signal is transmitted to the detection line 131 through the first switch tube, the whole detection line 131 is turned on only when no crack exists on the display panel, the detection line 131 can transmit the VGH signal to at least one pixel driving circuit connected to the detection line 131, and the at least one pixel driving circuit can emit abnormal bright light due to failure of light emission compensation under the influence of the VGH signal. When the display panel has a crack, the detection line 131 is not fully turned on, and the detection line 131 cannot transmit the VGH signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can perform light emission compensation, so that the light emitting element emits light normally. Therefore, when the at least one pixel driving circuit emits abnormal bright light, it can be determined that the display panel has no crack, and when the at least one pixel driving circuit emits normal light, it can be determined that the display panel has a crack.
The crack detection circuit is provided with a detection circuit and a control module connected with the detection circuit, wherein the detection circuit is connected with at least one pixel driving circuit on a display panel, and the control module is used for transmitting a first signal to the detection circuit when the crack detection is carried out on the display panel; the light emitting condition of the pixel driving circuit is different under the conditions that the display panel has cracks and does not have cracks, so that whether the display panel has cracks or not can be judged by combining the light emitting condition of the pixel driving circuit. The crack detection circuit is used for crack detection after each process section and module finished product, so that resource waste caused by the fact that a display panel with cracks is mistakenly used as a qualified product to be continuously processed subsequently can be avoided.
Fig. 3 is another structural diagram of the crack detection circuit provided in the present application in order to identify a specific orientation of a crack. On the basis of the above embodiments, the detection line 131 provided by the present embodiment includes at least one detection node. The detection circuit 131 in FIG. 3 includes a detection node A, a detection node B, a detection node C, a detection node D, a detection node E, a detection node A1, a detection node B1, a detection node C1, a detection node D1, and a detection node E1. For each sense node, the sense node is connected to a first pixel drive circuit, where the first pixel drive circuit is a pixel drive circuit in the same row and on the same side as the sense node.
It should be noted that: fig. 3 is only illustrated that the detection line 131 includes 10 detection nodes, and the denser the detection nodes are, the more specific the crack positions obtained by the detection method provided in this embodiment are. In this embodiment, the scheme of this embodiment is described only by taking 10 detection nodes as an example, and the number of the detection nodes is not limited in this application.
The following describes the connection between the detection node and the pixel driving circuit:
taking the detection node a as an example, the detection node a is connected to a first pixel driving circuit, which is a pixel driving circuit on the same row and on the same left side as the detection node a. Suppose that: the detection node a is located in the mth row of the pixel array, n pixels in the mth row on the left of the detection node a are respectively pixels 1 to n, each pixel has a corresponding pixel driving circuit, and then the pixel driving circuits corresponding to the pixels 1 to n are all the first pixel driving circuits. The detection node a and the pixel driving circuits corresponding to the pixels 1 to n may be connected through the via holes.
It should be noted that: referring to fig. 3, the connection relationship between the detection node B, the detection node C, the detection node D, the detection node E, the detection node a1, the detection node B1, the detection node C1, the detection node D1, the detection node E1 and the pixel driving circuit is similar to that of the detection node a, and the description of the embodiment is omitted here.
Alternatively, referring to FIG. 3, sense node A and sense node A1 may be in the same row, sense node B and sense node B1 may be in the same row, sense node C and sense node C1 may be in the same row, sense node D and sense node D1 may be in the same row, and sense node E1 may be in the same row, but this is merely an example and should not be construed as limiting the present application.
In one possible implementation manner, each pixel driving circuit in the display panel includes a light-emitting compensation module, and when the detection node is connected to the first pixel driving circuit, the detection node may be connected to the light-emitting compensation module in the first pixel driving circuit, and the detection principle specifically is as follows:
when no crack exists at a position corresponding to a certain detection node, the detection node can transmit a first signal to a light-emitting compensation module in a first pixel driving circuit connected with the detection node, so that the light-emitting compensation module cannot perform light-emitting compensation under the influence of the first signal, and the first pixel driving circuit emits abnormal bright light; when there is the crackle in the position department that this detection node corresponds, because this detection node can't give the luminescence compensation module with first signal for the luminescence compensation module can not receive the influence of first signal, can give out light the compensation, thereby makes first pixel drive circuit can normally give out light.
In one possible implementation, all the pixel driving circuits in the display panel may be 7T1C pixel driving circuits. The detection principle of the present application is described below with reference to 7T1C, but it should be noted that: the pixel driving circuit in the display panel may also be other types of circuits including a light-emitting compensation module, and is not described herein in detail by way of example.
Fig. 4 shows a block diagram of a 7T1C pixel drive circuit. The 7T1C pixel driving circuit includes 7 thin film transistors, a capacitor Cst, and a light emitting element, the 7 thin film transistors being T1, T2, T3, T4, T5, T6, and T7, respectively. Where, EL VDD is the positive voltage of the power supply, Data is the Data voltage, and EM is the control signal. T2 is also referred to herein as the second switch tube, and T3 is also referred to herein as the third switch tube. T2 and T3 constitute a luminescence compensation module.
The T4 is used to control the discharge of the capacitor Cst, the control terminal of the T4 is connected to the Scan1 signal, the second terminal of the T4 is connected to the low voltage Vref, and the first terminal of the T4 is connected to one end of the capacitor Cst.
The T7 is used for controlling the light emitting element to reset, the control end of the T7 is connected with a Scan3 signal, the second pole of the T7 is connected with a low potential voltage Vref, and the first pole of the T7 is connected with the anode of the light emitting element.
Alternatively, the light emitting element may be an organic light emitting diode.
The driving principle of the 7T1C pixel driving circuit is as follows:
in the period from T1 to T2 in fig. 5, Scan1 is at low potential, T4 turns on, the potential at point a is changed to low potential, and the capacitor Cst discharges.
In the period from T2 to T3, Scan2 and Scan3 are low, and T2, T3 and T7 are all turned on. The first pole and the second pole of the T1 are short-circuited (source drain short-circuited), and the potential | VA | of the point A is | > | Vth |; that is, at this time, T1 becomes a diode, T1 is turned on until the potential at point A becomes Vdata- | Vth | is turned off; t7 is turned on and the organic light emitting diode is reset.
After time T3, EM is low, and T5 and T6 are turned on. The voltage Vgs of the control terminal of T1 with respect to the first pole (source) is:
Vgs＝Vdd-(Vdata-|Vth|)；
the current Ids through T1 is given by:
Ids＝(1/2)K[Vdd-(Vdata-|Vth|)-|Vth|]2
that is, Ids ═ 1/2 (K) (Vdd-Vdata) 2;
K＝CoxμW/L；
the current flowing through the organic light emitting diode D1 is equal to Ids.
In one possible implementation, the sense node, when connected to each pixel driving circuit, may be connected to the control terminals of T2 and T3, as shown in fig. 6.
The crack detection principle of the present embodiment will be described below:
when crack detection is needed, the IC sends a PCD signal to the first switch tube, the first switch tube is turned on, the VGH signal is transmitted to the detection line 131 through the first switch tube, when there is no crack on the display panel, the entire detection line 131 is turned on, both T2 and T3 in the pixel driving circuit connected to each detection node can receive the VGH signal transmitted by the detection node, and the VGH signal is a high-level direct current signal, so that T2 and T3 are turned off after receiving the VGH signal, and T1 cannot obtain light emission compensation so that the light emitting element can emit abnormal bright light. That is, in the case of the display panel without cracks, all the pixel driving circuits connected to the detection node a, the detection node B, the detection node C, the detection node D, the detection node E, the detection node a1, the detection node B1, the detection node C1, the detection node D1, and the detection node E1 in fig. 3 emit abnormal light.
In the case of a crack in the display panel, for example, if a crack exists between the detection nodes B and C, the connection is made between the point O and the detection node B, and the connection is not made between the detection node B and the detection node E. As described above, the pixel driving circuit connected to the detection node a and the pixel driving circuit connected to the detection node B emit abnormally bright light. For the detection node C, the detection node D and the detection node E, the VGH signal cannot be transmitted to the pixel driving circuit connected thereto, so T2 and T3 are not controlled by the VGH signal to be turned off, and T1 can be compensated for light emission so that the light emitting element emits light normally. That is, the pixel driving circuit to which the detection node C is connected, the pixel driving circuit to which the detection node D is connected, and the pixel driving circuit to which the detection node E is connected all emit light normally.
That is, in the case where a crack exists between the detection nodes B and C, the pixel driving circuit connected to the detection node a and the pixel driving circuit connected to the detection node B emit abnormal light, and the pixel driving circuit connected to the detection node C, the pixel driving circuit connected to the detection node D, and the pixel driving circuit connected to the detection node E all emit light normally.
It can be seen that the light emission of the pixel driving circuit is different between the case where the display panel has cracks and the case where the display panel does not have cracks. Further, when the display panel has a crack, the position of the crack is different, and the pixel drive circuit emits light differently. Therefore, the position of the crack can be located by the light emission condition of the pixel drive circuit to which each detection node is connected in fig. 3.
For example:
the pixel driving circuits connected with the detection nodes A, B, C, A1 and B1 emit abnormal light, and the pixel driving circuits connected with the detection nodes D, E, C1, D1 and E1 emit normal light, so that the crack between the detection nodes C and D and the crack between the detection nodes B1 and C1 can be determined.
It should be noted that: in the above example, the type of the transistor is P-type, but this is only an example, and the transistor may also be N-type, and the application is not limited thereto, but it should be noted that: when the transistor is of an N-type, the VGH signal needs to be changed to the VGL signal.
The application provides a crack detection circuit, through set up a plurality of detection nodes on detecting the circuit, because the position of crack is different, the luminous condition of the pixel drive circuit that each detection node is connected is different, consequently can fix a position the position of crack according to the luminous condition of the pixel drive circuit that each detection node is connected.
Fig. 7 is a schematic view of a display panel provided in the present application, and as shown in fig. 7, the display panel provided in the present application includes: camera via area 10, package area 11, display area 12 and the crack detection circuit in the above embodiments. The function of each region is explained below:
camera through-hole region 10: for the camera to acquire images through the region.
The encapsulation region 11: in order to hide the camera below the screen, a hole needs to be punched in an operable Area (AA Area) of the display panel to form a camera through hole Area 10. When display panel's organic luminescent layer got into steam oxygen, can influence organic luminescent layer normal luminescence, if directly punch in AA district, organic luminescent layer side will expose in the air, lead to steam oxygen to get into organic luminescent layer easily, for this reason, can pack the position of punching, form encapsulation district 11, directly punch in this encapsulation district 11 to prevent that the side on organic emergence layer from exposing, specific packaging mode can see prior art, and this application is no longer repeated herein. The encapsulation area 11 mentioned in the present application is also called annual ring area, and the present application will describe the solution of the present application by taking the name of the encapsulation area 11 as an example.
Display area 12: for displaying a picture.
The perforation in the encapsulation area 11 includes Laser Lift-off (LLO), cutting, and bonding process segments, which may cause cracks in the encapsulation area 11, and if cracks occur in the encapsulation area 11, water vapor and oxygen may still enter the organic light emitting layer, which may cause the organic light emitting layer not to emit light normally, for example, black spots. The crack detection circuit in the above-described embodiment may be used to detect the package region 11.
Generally, the encapsulation region 11 is disposed around the camera through hole region 10, the display region 12 is disposed around the encapsulation region 11, a crack detection circuit can be disposed in the encapsulation region 11, and the structure of the crack detection circuit is referred to the above embodiments, which is not described herein again. The display region 12 includes pixel driving circuits arranged in an array, and the detection line 131 may be connected to at least one of the pixel driving circuits arranged in the array.
The detection principle of the cracks in the packaging area is as follows:
when crack detection needs to be performed on the packaging area 11, the IC sends a PCD signal to the first switch tube, the first switch tube is turned on, the VGH signal is transmitted to the detection line 131 through the first switch tube, the whole detection line 131 is only turned on if the packaging area 11 has no crack, the detection line 131 can transmit the VGH signal to at least one pixel driving circuit connected to the detection line 131, and the at least one pixel driving circuit can emit abnormal bright light due to the fact that light-emitting compensation cannot be performed under the influence of the VGH signal. When there is a crack in the package region 11, the detection line 131 is not fully conductive, and the detection line 131 cannot transmit the VGH signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can perform light emission compensation, so that the light emitting element emits light normally. Therefore, when the at least one pixel driving circuit emits abnormal light, it is determined that the package region 11 has no crack, and when the at least one pixel driving circuit emits normal light, it is determined that the package region 11 has a crack.
According to the display panel, after each process section and module finished product, crack detection can be carried out on the packaging area by using the crack detection circuit, and resource waste caused by the fact that the follow-up display panel with cracks is mistakenly processed as a qualified product can be avoided.
Fig. 8 is a flowchart of a first embodiment of a crack detection method provided in the present application. As shown in fig. 8, the crack detection method provided by the present application includes:
s901, the control module 132 transmits the first signal to the detection line 131.
When the crack detection circuit adopts the structure shown in fig. 1, when crack detection is required, a PCD signal, which may be a voltage signal of-7V, may be sent to the first switching tube through the IC, and the first switching tube is turned on after receiving the PCD signal, so that the first signal may be transmitted to the detection line 131 through the first switching tube.
As described above, when the transistor in the pixel driving circuit is N-type, the first signal may be VGH signal, and VGH is a high-level dc signal. When the transistor in the pixel driving circuit is P-type, the first signal may be VGL signal.
If there is no crack in the display panel and the entire detection line 131 is conducted, the detection line 131 will transmit the first signal to the at least one pixel driving circuit connected to the detection line 131, and then the at least one pixel driving circuit connected to the detection line 131 performs S902.
If there is a crack in the display panel, the detection line 131 is not fully conductive, and the detection line 131 cannot transmit the first signal to the at least one pixel driving circuit connected to the detection line 131, and then the at least one pixel driving circuit connected to the detection line 131 performs S903.
And S902, emitting abnormal bright light by at least one pixel driving circuit under the influence of the first signal.
And S903, enabling at least one pixel driving circuit to normally emit light.
According to the crack detection method provided by the embodiment, when crack detection is required, the control module transmits the first signal to the detection circuit, and the light emitting conditions of the pixel driving circuit are different under the two conditions of existence and nonexistence of cracks on the display panel, so that whether the display panel has cracks or not can be judged by combining the light emitting conditions of the pixel driving circuit.
Fig. 9 is a flowchart of a second embodiment of a crack detection method provided in the present application. As shown in fig. 9, the crack detection method provided by the present application includes:
s1001, the control module 132 transmits the first signal to the detection line 131.
See S901 for an implementation manner of S1001, which is not described herein again.
To identify a particular orientation of a crack, at least one detection node may be provided on the detection line 131, as shown in FIG. 3. The detection circuit 131 in FIG. 3 includes a detection node A, a detection node B, a detection node C, a detection node D, a detection node E, a detection node A1, a detection node B1, a detection node C1, a detection node D1, and a detection node E1.
The connection mode between each detection node and the pixel driving circuit is described above, and is not described herein again.
Take the example that all the pixel driving circuits in the display panel are the 7T1C pixel driving circuits shown in fig. 4. The sensing node, when connected to each pixel driving circuit, may be connected to the control terminals of the emission compensation blocks of fig. 4, i.e., T2 and T3. T2 is also referred to herein as the second switch tube, and T3 is also referred to herein as the third switch tube.
The structure and driving principle of the 7T1C pixel driving circuit are described above, and the description of the present application is omitted here.
In the case where there is no crack in the display panel, the entire detection line 131 is conducted, and the VGH signal transmitted by the detection node can be received by the pixel driving circuit connected to each detection node at T2 and T3, where the VGH signal is a high flat direct current signal, and after the VGH signal is received by T2 and T3, S1002 is executed.
In the case of a crack in the display panel, for example, if a crack exists between the detection nodes B and C, the connection is made between the point O and the detection node B, and the connection is not made between the detection node B and the detection node E. As described above, the pixel driving circuit connected to the detection node a and the pixel driving circuit connected to the detection node B emit abnormally bright light. However, for the sensing nodes C, D, and E, the VGH signal cannot be transmitted to the pixel driving circuits connected thereto, and thus T2 and T3 are not subjected to the VGH signal, and then T2 and T3 perform S1003.
S1002, the second switch tube and the third switch tube are closed, and the light-emitting element emits abnormal light.
Specifically, in the 7T1C pixel driving circuit, the Data voltage Data compensates the light emission of the light emitting element through the second switching tube and the third switching tube, and if the second switching tube and the third switching tube are turned off, the Data voltage Data cannot compensate the light emission of the light emitting element, so that the light emitting element emits abnormal light.
S1002, the second switching tube and the third switching tube work normally, and the light-emitting element emits light normally.
Specifically, since the VGH signal cannot be transmitted to the second switching tube and the third switching tube, the second switching tube and the third switching tube are not turned off under the influence of the VGH signal, so that the light emitting element can normally emit light.
That is, in the case where a crack exists between the detection nodes B and C, the pixel driving circuit connected to the detection node a and the pixel driving circuit connected to the detection node B emit abnormal light, and the pixel driving circuit connected to the detection node C, the pixel driving circuit connected to the detection node D, and the pixel driving circuit connected to the detection node E all emit light normally.
According to the crack detection method provided by the application, due to the fact that the positions of the cracks are different, the light emitting conditions of the pixel driving circuits connected with the detection nodes are different, and therefore the positions of the cracks can be located according to the light emitting conditions of the pixel driving circuits connected with the detection nodes.
The display panel provided by the application can be applied to terminal equipment. The terminal equipment can be a mobile phone, a tablet computer, an intelligent watch, a television and other electronic equipment with a display screen and a camera under the screen. By way of example, and not limitation, in the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A crack detection circuit for detecting a display panel, the crack detection circuit comprising: the display panel crack detection circuit comprises a detection circuit and a control module connected with the detection circuit, wherein the detection circuit is connected with at least one pixel driving circuit on the display panel, and the control module is used for transmitting a first signal to the detection circuit when the display panel is subjected to crack detection;
when the display panel has no crack, the detection circuit is used for transmitting the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit emits abnormal bright light under the influence of the first signal; when the display panel has a crack, the detection circuit cannot transmit the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can normally emit light.
2. The crack detection circuit of claim 1, wherein a first terminal of the control module is coupled to the first signal, a control terminal of the control module is coupled to a crack detection signal, and a second terminal of the control module is coupled to the detection line.
3. The crack detection circuit of claim 2, wherein the control terminal of the control module is connected to an Integrated Circuit (IC) through a panel edge detection line, and the IC is configured to send the crack detection signal to the control module when the crack detection is performed on the display panel.
4. Crack detection circuit as claimed in any of the claims 1-3, characterized in that the detection line comprises at least one detection node, which for each detection node is connected to a first pixel driving circuit, which is a pixel driving circuit in the same row and on the same side as the detection node.
5. The crack detection circuit of claim 4, wherein the first pixel driving circuit comprises a luminescence compensation module, the detection node and the luminescence compensation module being connected;
when no crack exists at the position corresponding to the detection node on the display panel, the detection node is used for transmitting the first signal to the light-emitting compensation module, so that the light-emitting compensation module cannot perform light-emitting compensation under the influence of the first signal, and the first pixel driving circuit emits abnormal bright light; when a crack exists at a position corresponding to the detection node on the display panel, the detection node cannot transmit the first signal to the light-emitting compensation module, so that the at least one pixel driving circuit can normally emit light.
6. A display panel, comprising: the crack detection circuit comprises a camera through hole area, an encapsulation area, a display area and the crack detection circuit of any one of claims 1 to 5, wherein the encapsulation area is arranged around the camera through hole area, the display area is arranged around the encapsulation area, the camera through hole area is used for a camera to collect images, the encapsulation area is used for preventing the side edge of the organic luminescent layer of the display area from being exposed in the air, and the crack detection circuit is arranged in the encapsulation area and used for performing crack detection on the encapsulation area.
7. The display panel according to claim 6, wherein the display region includes pixel driving circuits arranged in an array, and the detection line is connected to at least one of the pixel driving circuits arranged in the array;
when the packaging area has no crack, the detection circuit is used for transmitting the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit emits abnormal bright light under the influence of the first signal; when the packaging area has cracks, the detection circuit cannot transmit the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can normally emit light.
8. A terminal device characterized by comprising the display panel of claim 6 or 7.
9. A crack detection method applied to the crack detection circuit according to any one of claims 1 to 5, the method comprising:
when crack detection is carried out on the display panel, the control module transmits a first signal to the detection circuit;
when the display panel has no crack, the detection circuit transmits the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit emits abnormal bright light under the influence of the first signal; when the display panel has a crack, the detection circuit cannot transmit the first signal to the at least one pixel driving circuit, so that the at least one pixel driving circuit can normally emit light.
10. The method of claim 9, wherein the control module communicates a first signal to the detection circuitry comprising:
the control module is conducted under the control of the crack detection signal, so that the first signal connected with the first end of the control module is transmitted to the detection line.
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