CN112419947B - Display panel, crack detection method thereof and display device - Google Patents
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a display panel, a crack detection method thereof and a display device, wherein the display panel comprises: at least one detection line of the non-display area and an auxiliary detection line disposed around the display area; each detection line comprises a head end and a tail end; the auxiliary detection lines are respectively connected with the head ends of the detection lines; the non-display area also comprises a third switching tube, a plurality of first switching tubes and a plurality of second switching tubes; the third switching tube is used for transmitting the auxiliary detection signal to the auxiliary detection line; each detection line is connected with at least one first data line through at least one first switching tube, and the at least one first switching tube is connected with the tail end of the connected detection line; the auxiliary detection line is connected with a plurality of second data lines through a plurality of second switching tubes; the control ends of the first switching tube, the second switching tube and the third switching tube are all connected with the first level output end. The technical scheme provided by the invention can solve the problem that the existing crack detection circuit has dark lines in the module manufacturing process.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a crack detection method thereof and a display device.
Background
With the continuous development of display technology, display devices are increasingly used in various fields. In general, a plurality of patterns of display panels are formed on a mother board in a manufacturing process of the display panels, and then the mother board is cut to finally obtain the discrete display panels, but cracks may be generated at edges of the display panels in a cutting process, and as a service time increases, the cracks may extend into the display panels to affect service lives of the display panels, so that panel crack detection (Panel Crack Detection, PCD) is required after the display panel is cut.
In the prior art, most of crack detection methods form a circle of metal wire on the edge of a display panel, the metal wire is connected with a crack detection circuit, whether the display panel has cracks is judged by using a bright and dark picture detection mode in a lighting test stage, specifically, a data wire of the display panel is directly connected to the crack detection circuit, and whether the display panel has cracks is confirmed by displaying bright lines or dark lines through the display panel. However, in the subsequent module stage, the switching tube of the crack detection circuit is easy to deviate the bias voltage or generate leakage current, so that the switching tube leaks high voltage onto the data line, the data line is pulled up, a dark line appears on the screen, and normal module detection or subsequent panel display is affected, so that the crack detection circuit is not suitable for module manufacturing process.
Disclosure of Invention
The embodiment of the invention provides a display panel, a crack detection method thereof and a display device, which are used for solving the problem that dark lines appear in the conventional crack detection circuit in a module manufacturing process.
In a first aspect, an embodiment of the present invention provides a display panel, including: a display region and a non-display region surrounding the display region; the non-display area comprises at least one detection line and an auxiliary detection line arranged around the display area; each detection line comprises a head end and a tail end; the auxiliary detection lines are respectively connected with the head end of at least one detection line;
the non-display area further comprises a third switching tube, a plurality of first switching tubes and a plurality of second switching tubes; the third switching tube is used for transmitting an auxiliary detection signal of the auxiliary detection signal output end to the auxiliary detection line; the display area comprises a plurality of first data lines and second data lines; each detection line is connected with at least one first data line through at least one first switching tube, and at least one first switching tube is connected with the tail end of the detection line; the auxiliary detection line is connected with a plurality of second data lines through a plurality of second switching tubes; the control ends of the first switching tube, the second switching tube and the third switching tube are all connected with a first level output end; and judging the fracture state of the detection line and/or the auxiliary detection line by driving the pixels connected with the first data line to emit light or not and driving the pixels connected with the second data line to emit light or not.
In a second aspect, an embodiment of the present invention provides a display apparatus, where the display apparatus includes the display panel provided in any embodiment of the present invention.
In a third aspect, an embodiment of the present invention further provides a crack detection method for a display panel, which is applicable to the display panel provided in any embodiment of the present invention, including:
controlling an auxiliary detection signal output end to output an auxiliary detection signal to an auxiliary detection line;
when crack detection is carried out, a third level is output to the control ends of the first switching tube, the second switching tube and the third switching tube through the first level output end so as to conduct the first switching tube, the second switching tube and the third switching tube; judging the breaking state of the detection line and/or the auxiliary detection line by driving the pixels connected with the first data line to emit light or not and driving the pixels connected with the second data line to emit light or not;
when the image display is carried out, a fourth level is output to the control ends of the first switch tube, the second switch tube and the third switch tube through the first level output end, so that the first switch tube, the second switch tube and the third switch tube are cut off, and the auxiliary detection line is suspended.
In the invention, the non-display area of the display panel comprises at least one detection line and an auxiliary detection line arranged around the display area, the detection line comprises a head end and a tail end, the auxiliary detection line is connected with the head end of each detection line to realize the communication of the detection line and the auxiliary detection line, the non-display area also comprises a first switch tube, a second switch tube and a third switch tube, each detection line is connected with a corresponding first data line through at least one first switch tube, the third switch tube is used for connecting an auxiliary detection signal output end and the auxiliary detection line, the auxiliary detection line is connected with a corresponding second data line through a plurality of second switch tubes, the control ends of the three switch tubes are all connected with the first level output end and are simultaneously conducted, when the detection line is not broken, an auxiliary detection signal is transmitted to the auxiliary detection line and the detection line through the third switch tube, the first data line of the detection line drives the connected pixels to emit light or not emit light, when the detection line is broken, the auxiliary detection signal can not reach all positions of the detection line, the connected first data line drives the connected pixels to emit light or not emit light, and in addition, the condition that the auxiliary detection signal can be judged by the second data line drives the connected pixels to emit light or not to break. In this embodiment, the tail end of each detection line is at least connected to one first switching tube, so that when any position on the detection line breaks, the first switching tube connected to the tail end can drive the connected pixel to detect the crack. And auxiliary detection signals are transmitted to the auxiliary detection line through the third switching tube, when crack detection is not carried out, the third switching tube is not conducted, the auxiliary detection signals cannot be transmitted to the auxiliary detection line, then the terminals of the first switching tube and the second switching tube are suspended, the condition that the control ends and the source electrodes of the first switching tube and the second switching tube are simultaneously connected with the same high level is effectively avoided, so that bias voltage deviation or leakage current is not easy to occur in the first switching tube and the second switching tube, the problem that the first switching tube or the second switching tube leaks high level to a data line is avoided, the problem of dark lines of a display panel is effectively prevented, and the quality of module detection or subsequent display is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a comparative example of a display panel according to the present invention;
FIG. 5 is a schematic diagram of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of another display panel according to an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of the display panel of FIG. 2 along line a-a';
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 11 is a flow chart of a crack detection method of a display panel according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
An embodiment of the present invention provides a display panel including:
a display region and a non-display region surrounding the display region; the non-display area comprises at least one detection line and an auxiliary detection line arranged around the display area; each detection line comprises a head end and a tail end; the auxiliary detection lines are respectively connected with the head end of at least one detection line;
the non-display area also comprises a third switching tube, a plurality of first switching tubes and a plurality of second switching tubes; the third switching tube is used for transmitting an auxiliary detection signal of the auxiliary detection signal output end to the auxiliary detection line; the display area comprises a plurality of first data lines and second data lines; each detection line is connected with at least one first data line through at least one first switching tube, and the at least one first switching tube is connected with the tail end of the connected detection line; the auxiliary detection line is connected with a plurality of second data lines through a plurality of second switching tubes; the control ends of the first switching tube, the second switching tube and the third switching tube are connected with the first level output end; and judging the fracture state of the detection line and/or the auxiliary detection line by driving the pixels connected with the first data line to emit light or not and driving the pixels connected with the second data line to emit light or not.
In the embodiment of the invention, the non-display area of the display panel comprises at least one detection line and an auxiliary detection line arranged around the display area, the detection line comprises a head end and a tail end, the auxiliary detection line is connected with the head end of each detection line to realize the communication between the detection line and the auxiliary detection line, the non-display area also comprises a first switch tube, a second switch tube and a third switch tube, each detection line is connected with a corresponding first data line through at least one first switch tube, the third switch tube is used for connecting an auxiliary detection signal output end and the auxiliary detection line, the auxiliary detection line is connected with a corresponding second data line through a plurality of second switch tubes, the control ends of the three switch tubes are connected with the first level output end and are simultaneously conducted, when the detection line is not broken, an auxiliary detection signal is transmitted to the auxiliary detection line and the detection line through the third switch tube, the first data line of the detection line drives the connected pixels to emit light or not emit light, when the detection line is broken, the auxiliary detection signal can not reach all positions of the detection line, the first data line connected with the detection line drives the connected pixels to emit light or not emit light, in addition, the second data line can drive the connected pixels to emit light or emit light through the second data line to drive the connected pixels to the second data line to emit light, the control signals to drive the connected pixels to the first level switch, and the connected with the first switch tube can drive the connected pixels to the detection line to realize at least broken position. And auxiliary detection signals are transmitted to the auxiliary detection line through the third switching tube, when crack detection is not carried out, the third switching tube is not conducted, the auxiliary detection signals cannot be transmitted to the auxiliary detection line, then the terminals of the first switching tube and the second switching tube are suspended, the condition that the control ends and the source electrodes of the first switching tube and the second switching tube are simultaneously connected with the same high level is effectively avoided, so that bias voltage deviation or leakage current is not easy to occur in the first switching tube and the second switching tube, the problem that the first switching tube or the second switching tube leaks high level to a data line is avoided, the problem of dark lines of a display panel is effectively prevented, and the quality of module detection or subsequent display is improved.
The foregoing is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, as shown in fig. 1, the display panel includes a display area AA and a non-display area NA disposed around the display area AA, the display area AA includes pixels 11 arranged in an array, and scan lines G and data lines D disposed in an intersecting manner, the scan lines G and the data lines D intersect to define positions of the respective pixels 11, the non-display area NA includes an auxiliary detection line 12 disposed around the display area AA, and the auxiliary detection line 12 may be a non-closed structure in fig. 1, that is, the auxiliary detection line 12 includes a head end 121 and a tail end 122, and a certain gap S1 exists between the head end 121 and the tail end 122. In addition, the auxiliary sensing line 12 may be a closed structure, for example, the auxiliary sensing line 12 may be a ring shape, which is disposed around the entire display area AA, which is not limited in this embodiment. The non-display area NA further includes at least one detection line 13, where the detection line 13 is disposed at an edge of the display panel, the detection line 13 is used for applying a fixed voltage, and whether the detection line 13 is broken can be determined by detecting voltage values at different positions on the detection line 13. In this embodiment, the auxiliary detection lines 12 provide auxiliary detection signals for the detection lines 13, specifically, as shown in fig. 1, each detection line 13 includes a head end 13a and a tail end 13b, and the auxiliary detection line 12 is connected to the head end 13a of each detection line 13 to provide auxiliary detection signals for the detection lines 13. For example, referring to fig. 1, if a certain detection line 13 breaks (the cross sign in fig. 1 indicates a break), the auxiliary detection signal can be obtained only from the head end 13a to the break of the detection line 13, the auxiliary detection signal cannot be obtained from the break to the tail end 13b of the detection line 13, and the detection line 13 may be divided into multiple parts and connected to different data lines D, and whether a break exists on the detection line 13 is determined according to the brightness of the pixel 11. It should be noted that a plurality of detection lines 13 may be disposed around the display area AA in common, and referring to fig. 1, two detection lines 13 may be disposed, and two detection lines 13 may be disposed around the display area AA. In addition, the detection lines 13 may be disposed only at the edge where breakage is likely to occur, as shown in fig. 2, fig. 2 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, where the detection lines 13 may be disposed on the longer side of the display panel for the broken high-emission area, that is, two sides of the lower step area NA1 of the display panel may be disposed with the detection lines 13, and the specific disposition form of the detection lines 13 is not limited in this embodiment.
Specifically, with continued reference to fig. 1, the non-display area NA further includes a first switching tube T1, a second switching tube T2, and a third switching tube T3. The third switch tube T3 may be at least one, in fig. 1, a third switch tube T3 is used to make a schematic diagram, the third switch tube T3 is respectively connected with the auxiliary detection signal output end 14 and the auxiliary detection line 12, and can output auxiliary detection signals to the auxiliary detection line 12, alternatively, the third switch tube T3 may also be multiple, each third switch tube T3 is provided with a corresponding auxiliary detection signal output end 14, all the auxiliary detection signal output ends 14 are of the same potential, and can respectively output the same auxiliary detection signals to the auxiliary detection line 12, so that the potential accuracy of each position of the auxiliary detection line 12 is improved, and the situation of potential difference generated by voltage drop at different positions of the auxiliary detection line 12 is effectively avoided. As shown in fig. 3, fig. 3 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, two third switching tubes T3 may be disposed, and the two third switching tubes T3 are disposed on opposite sides of the display area AA and symmetrically disposed, and referring to fig. 3, the embodiment may include two detection lines 13, and the detection lines 13 are also disposed on opposite sides of the display area AA and symmetrically disposed, so that a symmetrical structure of the whole display panel is realized on the whole, which is convenient for designing and manufacturing a panel process, and each third switching tube T3 is disposed near a corresponding detection line 13, which is favorable for realizing potential balance on the two detection lines 13.
The data line D in this embodiment may be divided into a first data line D1 and a second data line D2, the first switching tube T1 is used for connecting the detection line 13 and the first data line D1, and the second switching tube T2 is used for connecting the detection line 13 and the second data line D2. The first switching tube T1 may be provided in plurality, each detection line 13 is connected to at least one first switching tube T1, so that signals on the detection lines 13 can be transmitted to the first data line D1, and the second switching tube T2 may be provided in plurality, so that the auxiliary detection line 12 transmits auxiliary detection signals to the second data line D2. Optionally, as shown in fig. 1, the first switching tubes T1 are connected to the first data lines D1 in a one-to-one correspondence; the second switching tubes T2 are connected to the second data lines D2 in a one-to-one correspondence manner, and in addition, each first switching tube T1 may be connected to a plurality of first data lines D1, each second switching tube T2 is connected to a plurality of second data lines D2, and the correspondence relationship between the switching tubes and the data lines is not limited in particular in this embodiment. The first level output terminal V1 is connected to the first switching tube T1, the second switching tube T2 and the third switching tube T3, and can be turned on or off simultaneously, when the three switching tubes are turned on simultaneously, crack detection is performed on the display panel, if none of the detection line 13 and the auxiliary detection line 12 breaks, the auxiliary detection signal is transmitted to the detection line 13 and the auxiliary detection line 12 via the third switching tube T3, so that the pixels connected to the detection line 13 and the auxiliary detection line 12 emit light or neither, when the detection line 13 breaks, a part of the detection line 13 cannot acquire the auxiliary detection signal, so that the pixel connected to the first data line D1 connected to the part of the detection line 13 emits light or does not emit light, and when the auxiliary detection line 12 breaks, a part of the auxiliary detection line 12 cannot acquire the auxiliary detection signal, so that the pixel connected to the second data line D2 connected to the part of the auxiliary detection line 12 emits light or does not emit light, and thus the crack is judged. For example, as shown in fig. 1, when the detection line 13 is broken at the graphic P1 or the auxiliary detection line 12 is broken at the graphic P2, the pixel connected to the first data line D1 connected to the first detection line 131 emits light, and the pixel connected to the second data line D2 does not emit light, the display panel displays a bright line; when the auxiliary detecting line 12 is broken at the position P3, the pixels connected to the first data line D1 and the second data line D2 near the first detecting line 131 do not emit light, and the pixels connected to the first data line D1 and the second data line D2 near the second detecting line 132 emit light, taking the position P3 as a boundary. The embodiment can judge the occurrence position of the crack through the bright and dark display state of the display panel.
Optionally, with continued reference to fig. 1, the auxiliary detection line 12 is configured to make the first data line D1 connected to the detection line 13 drive the connected pixel to emit no light when the detection line 13 is not broken, and make the first data line D1 connected to the detection line 13 drive the connected pixel to emit light when the detection line 13 is broken. The auxiliary detection signal is transmitted to the auxiliary detection line 12 through the third switching tube T3, if the detection line 13 is not broken, the auxiliary detection signal can be transmitted to the detection line 13, the detection line 13 is transmitted to the corresponding first data line D1 through the first switching tube T1, and the pixel 11 connected to the first data line D1 is not lighted under the driving of the auxiliary detection signal. When the detection line 13 breaks, a part of the detection line 13 cannot acquire the auxiliary detection signal, and the part of the detection line 13 cannot transmit the auxiliary detection signal to the first data line D1, and the pixel 11 connected to the first data line D1 emits light. At this time, the second data line D2 can acquire the auxiliary detection signal, and is in a non-light emitting state, and under the contrast of the pixels 11 connected to the second data line D2, only the pixels 11 connected to the first data line D1 emit light to form a bright line, so that whether the detection line 13 is broken or not can be determined according to the bright line. In this embodiment, the tail end 13b of each detection line 13 is connected with at least one first switch tube T1, so that the first switch tube T1 can detect the situation that any position between the head end 13a and the tail end 13b of the detection line 13 is broken, and the accuracy of crack detection is enhanced.
It should be noted that, as shown in fig. 1, in this embodiment, the first switch tube T1 and the second switch tube T2 form a crack detection circuit 17, in the module display stage, the third switch tube T3 is kept in a closed state, the auxiliary detection signal cannot reach the auxiliary detection line 12, the auxiliary detection line 12 is in a floating state, both the first switch tube T1 and the second switch tube T2 cannot be turned on, and leakage currents are not easily generated in the first switch tube T1 and the second switch tube T2, so that the influence of the auxiliary detection signal on the display of the display panel is avoided, the display panel is prevented from displaying dark lines, and the quality of module detection or subsequent display is improved. Referring to fig. 4, fig. 4 is a schematic diagram of a comparative example structure of a display panel provided by the present invention, in which fig. 4 shows a switch tube T1' in a crack detection circuit, the switch tube T1' is connected to a data line D ' and a crack detection line PCD ', respectively, when the crack detection line of the switch tube T1' needs to be at a high level VGH in a module display process, and a control end of the switch tube T1' needs to be at a high level VGH at the same time, so as to prevent the switch tube T1' from being turned on to avoid affecting a normal display of the display module, but the Vgs of the switch tube T1' is zero for a long time, which easily causes Vth shift or leakage current of the switch tube T1', so that the high level VGH is output to the data line D ', so that the data line D ' is pulled up, a dark line appears on the display panel, affecting a normal module detection or a subsequent panel display, so that the crack detection circuit in the comparative example is not suitable for the module process, and the crack detection cannot be performed in the module stage before the module process, so that the crack detection is required to be cut off before the module process, causing a problem of increasing the number of the subsequent unqualified display panels. In this embodiment, in order to make the display panel still display normally in the module stage, the third switching tube T3 is adopted to make the terminals of the first switching tube T1 and the second switching tube T2 connected with the detection line 13 or the auxiliary detection line 12 in the module stage hang in the air, and no leakage current is output to the data line D. Therefore, the crack detection method can be simultaneously applied to the lighting test stage and the module test stage of the display panel, and the problem that the crack detection method in the lighting test stage cannot be used in the module test stage because the display of the display panel is affected is avoided.
Fig. 5 is a schematic structural view of another display panel according to an embodiment of the present invention, and fig. 6 is a schematic structural view of another display panel according to an embodiment of the present invention, where optionally, the non-display area NA may further include a gate driving circuit (not shown in fig. 5 and 6); as shown in fig. 5 and 6, the gate driving circuit includes a plurality of first shift registers 15 sequentially cascaded and a plurality of second shift registers 16 sequentially cascaded; the output end of the first shift register 15 is used for outputting a grid scanning signal; the output end of the second shift register 16 is used for outputting a light-emitting control signal; the output of either the first shift register 15 or the second shift register 16 may be multiplexed as the auxiliary detection signal output 14.
The auxiliary detection signal in this embodiment is preferably a high level fixed voltage, which may typically be provided by a crack detection circuit, i.e. a pin is led from the crack detection current to the auxiliary detection signal output 14. The shift register of the gate driving circuit of the display panel is also generally at a high level. For example, the gate driving circuit may include a first shift register 15 for outputting a gate scan signal, and may further include a second shift register 16 for outputting a light emission control signal. The first shift registers 15 and the second shift registers 16 are sequentially cascaded, and the gate scan signal output from any one of the first shift registers 15 may be used as the auxiliary detection signal, or the emission control signal output from any one of the second shift registers 16 may be used as the auxiliary detection signal, which is not limited in this embodiment. The output of either the first shift register 15 or the second shift register 16 is multiplexed as the auxiliary detection signal output 14 in this embodiment. For example, as shown in fig. 5, a gate scanning signal output from the first shift register 15 of zero order is used as an auxiliary detection signal, and as shown in fig. 6, a light emission control signal output from the second shift register 16 of one order is used as an auxiliary detection signal.
It should be noted that the auxiliary detection line output terminal 14 may also be used as a signal testing terminal of the driving circuit, for example, if the auxiliary detection line output terminal 14 is an output terminal of the first shift register 15, the measurement of the gate scan signal may be implemented through the auxiliary detection line output terminal 14, and similarly, if the auxiliary detection line output terminal 14 is an output terminal of the second shift register 16, the measurement of the light emission control signal may be implemented through the auxiliary detection line output terminal 14. The driving circuit signal testing terminal can realize the function of measuring the driving circuit signal around the display panel, especially when the auxiliary detection line output terminal 14 multiplexes the zero-order first shift register 15 or multiplexes the low-order second shift register 16, the setting of the auxiliary detection line output terminal 14 in this embodiment can measure the driving signal far from one end of the driving chip, so as to further enhance the control of the whole display panel. It should be noted that when the plurality of third switch tubes T3 are provided, a plurality of auxiliary detection line output terminals 14 with the same potential corresponding to the third switch tubes T3 one by one are provided, and the user can measure different parameters of the display panel peripheral driving circuit signal through different auxiliary detection line output terminals 14, for example, measure the frequency of the gate scanning signal through one of the auxiliary detection line output terminals 14 and measure the amplitude of the gate scanning signal through the other auxiliary detection line output terminal 14, thereby realizing more accurate measurement of the display panel peripheral driving circuit signal and improving the measurement performance.
Fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and optionally, at least one intermediate connection terminal 13c may be included between the head end 13a and the tail end 13b of each detection line 13; each intermediate connection terminal 13c is connected to at least one first switching tube T1.
As shown in fig. 7, at least one intermediate connection terminal 13c may be included between the head end 13a and the tail end 13b of each detection line 13, for example, fig. 7 only shows a schematic diagram with one intermediate connection terminal 13c added, and alternatively, the intermediate connection terminal 13c may be selected from a midpoint between the head end 13a and the tail end 13b of each detection line 13, which may be other positions, but the embodiment is not limited thereto. Each intermediate connection terminal 13c is connected to at least one first switching tube T1, and the corresponding at least two columns of pixels 11 may be displayed with bright lines to verify crack detection of the detection line 13. The intermediate connection terminal 13c is provided to further position the crack position of the inspection line 13. For example, as shown in fig. 7, if the pixel 11 connected to the first data line D1 connected to the intermediate connection terminal 13c of the detection line 13 does not emit light and the pixel 11 connected to the first data line D1 connected to the tail end 13b of the detection line 13 emits light, it may be determined that the detection line 13 is broken and that the crack position is located in the region between the intermediate connection terminal 13c and the tail end 13b of the detection line 13. The scheme of the embodiment can position the cracks of the detection line, and is convenient for implementing remedial measures according to the positions of the cracks.
Alternatively, as shown in fig. 1, the first level output terminal V1 may be a lighting test pad for lighting test; or, the output pins used for binding the driving chip or the flexible circuit board are bound with bonding pads. The first level output terminal V1 may be a lighting test pad for lighting test, and the crack detection circuit 17 may obtain control signals of the first switching tube T1, the second switching tube T2, and the third switching tube T3 from the lighting test pad when performing crack detection after the lighting test. After the lighting test is finished, the lower step area NA1 of the display panel needs to be bound with a driving chip or a flexible circuit board to form a display module. After the display module is formed, if module detection is needed, the crack detection circuit 17 can be used for detecting the cracks again, so that the display panel is prevented from generating cracks in the module manufacturing process due to collision and other factors, the yield of the display device is further improved, and the manufacturing efficiency of the display device is improved.
Optionally, with continued reference to fig. 1, the non-display area NA may include a binding area NA2 near the first edge L1 of the display area AA for binding a driving chip or a flexible circuit board; the first switching tube T1 and the second switching tube T2 are arranged in a first non-display area NA3 close to the second edge L2 of the display area AA; the first edge L1 and the second edge L2 are disposed opposite to each other.
The step area NA1 of the display panel is provided with a binding area NA2 for binding a driving chip or a flexible circuit board, in this embodiment, the edge of the display area AA close to the binding area NA2 is set to be a first edge L1, then the edge opposite to the first edge L1 is set to be a second edge L2, that is, the second edge L2 is the edge of the display area AA far away from the binding area NA2, and the non-display area close to the second edge L2 of the display area AA is set to be a first non-display area NA3, in this embodiment, the crack detection circuit 17 formed by the first switch tube T1 and the second switch tube T2 is set in the first non-display area NA3, so that the width of the step area NA1 is effectively reduced, and the narrow frame design of the whole display panel is realized.
In addition to being disposed in the first non-display area NA3, the crack detection circuit may be disposed in the step area NA1, as shown in fig. 8, fig. 8 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, in this embodiment, the crack detection circuit 17 formed by the first switch tube T1 and the second switch tube T2 is disposed in the step area NA1, at this time, the tail end 13b of the detection line 13 is disposed in the step area NA1, and then the first switch tube T1 and the second switch tube T2 are disposed closer to the tail end 13b of the detection line 13, so as to improve the accuracy of crack detection. And the crack detection circuit is convenient to be arranged together with the static protection circuit, the demux circuit and the like of the step area NA1, and is convenient for sharing external signal input pins.
Optionally, with continued reference to fig. 1, each of the first switching tube T1, the second switching tube T2, and the third switching tube T3 may include a first end K1, a second end K2, and a control end K3; the first end K1 of the first switching tube T1 is connected with a corresponding detection line 13, and the second end K2 of the first switching tube K2 is connected with a corresponding first data line D1; the first end K1 of the second switching tube T2 is connected with the auxiliary detection line 12, and the second end K2 of the second switching tube T2 is connected with the corresponding second data line D2; the first end K1 of the third switching tube T3 is connected to the auxiliary detection line 12, and the second end K2 of the third switching tube T3 is connected to the auxiliary detection signal output end 14. For example, the first end K1 of the first, second and third switching tubes T1, T2 and T3 may be a source and the second end K2 may be a drain. When the third switching tube T3 is turned on, the auxiliary detection signal output end 14 will be transmitted to the auxiliary detection line 12, and when the third switching tube T3 is turned off, the first ends K1 of the first switching tube T1 and the second switching tube T2 are both suspended, so that no high level is output to the data line D.
Alternatively, with continued reference to FIG. 1, the auxiliary detection signal 12 may be a second high level; the first switching tube T1, the second switching tube T2 and the third switching tube T3 are P-type switching tubes; the first level output terminal V1 is used for outputting a first low level when crack detection is carried out; the auxiliary detection signal is used for enabling the first data line D1 connected with the detection line 13 to receive a second high level when the detection line 13 is not broken; the auxiliary detection signal is also used for enabling the first data line D1 connected with the detection line 13 to receive a second low level when the detection line 13 breaks; the first level output terminal V1 is further configured to output a first high level when performing image display; the auxiliary detection signal is used for turning off the third switching tube T3 so as to suspend the auxiliary detection line 12.
In this embodiment, the auxiliary detection signal 12 may be selected to be at a high level, so that the output end of the shift register is conveniently multiplexed to be the auxiliary signal output end 14, and the auxiliary detection signal 12 may be at a second high level, where the first switching tube T1, the second switching tube T2, and the third switching tube T3 are P-type switching tubes, that is, the first switching tube T1, the second switching tube T2, and the third switching tube T3 are all turned off at a high level, and turned on at a low level. When crack detection is performed, the first level output end V1 outputs a first low level to the control end K3 of each switching tube, the first end K1 of the third switching tube T3 is a second high level, the control end K3 is the first low level, the third switching tube T3 is turned on and inputs the second high level to the auxiliary detection signal 12, the first end K1 of the second switching tube T2 is a second high level, the control end K3 is the first low level, the second switching tube T2 is turned on and inputs the second high level to the corresponding second data line D2, and the pixel 11 connected to the second data line D2 does not emit light. If the detection line 13 has no crack, the detection line 13 acquires a second high level, the first end K1 of the first switch tube T1 is the second high level, the control end K3 is the first low level, the first switch tube T1 is turned on and inputs the second high level to the corresponding first data line D1, and the pixel 11 connected to the first data line D1 does not emit light, that is, when the detection line 13 has not been broken, the whole display panel is dark. When the detection line 13 has a crack, a part of the position where the detection line 13 exists does not acquire the second high level, the first end K1 of the first switching tube T1 is at the second low level (caused by metal fracture), the control end K3 is at the first low level, the first switching tube T1 is turned on and inputs the second low level to the corresponding first data line D1, the pixel 11 connected to the first data line D1 emits light, that is, when the detection line 13 breaks, at least one column of pixels 11 emits a bright line on the whole display panel, so that the display panel is judged to have the crack.
In addition, when the display panel normally displays, the first level output end V1 outputs a first high level to the control ends K3 of the first switching tube T1, the second switching tube T2 and the third switching tube T3, the control end K3 of the third switching tube T3 is the first high level, the first end K1 is the second high level, the third switching tube T3 is turned off, the auxiliary detection line 12 floats, the second high level cannot be obtained, the control ends K3 of the first switching tube T1 and the second switching tube T2 are the first high level, the first end K1 is a suspension potential, the first switching tube T1 and the second switching tube T2 are turned off, the first switching tube T1 and the second switching tube T2 cannot influence the potential of the data line, dark lines generated on the display panel by the first switching tube T1 and the second switching tube T2 are effectively avoided, and the display quality of the display panel is improved.
Alternatively, with continued reference to fig. 1, the first data line D1 and the second data line D2 may extend in the first direction X and be sequentially disposed in the second direction Y; the first direction X and the second direction Y are parallel to the plane of the display panel; the first switching tube T1 and the second switching tube T2 are sequentially arranged along the second direction Y. In the direction along the second direction Y, the first switching tube T1 and the second switching tube T2 are sequentially arranged, and the first data line D1 and the second data line D2 are sequentially arranged, which should be noted that the arrangement sequence of the first data line D1 and the second data line D2 is not limited in this embodiment, and the arrangement sequence of the first switching tube T1 and the second switching tube T2 is not limited in the same manner. In this embodiment, the arrangement order of the first data lines D1 and the second data lines D2 may be set according to the principle of easy crack recognition, for example, alternatively, M first data lines D1 may be adjacently arranged along the second direction Y; m is an integer greater than 1; p second data lines D2 are adjacently disposed along the second direction Y; p is an integer greater than 1. The first data lines D1 are arranged together, and the second data lines D2 are arranged together, so that when the detection line 13 breaks, the plurality of first data lines D1 drive the pixels 11 connected with the first data lines to emit light, so that obvious bright lines are formed, and the breaking condition is rapidly identified. In addition, the arrangement sequence of the first data lines D1 and the second data lines D2 may also have other manners, for example, the first data lines D1 and the second data lines D2 are alternately arranged, so as to enhance the contrast of the light and shade of the display panel and improve the recognition accuracy.
Alternatively, the pixels 11 may include at least a first color pixel and a second color pixel; the pixel 11 connected to the first data line D1 is a first color pixel; the pixel 11 connected to the second data line D2 is a second color pixel. The first data line D1 and the second data line D2 respectively drive the pixels 11 with different colors, so as to further increase the contrast when the detection line 13 generates cracks, for example, when the first data line D1 is connected with a red pixel, the detection line 13 is determined to generate cracks when the red pixel is lighted, so that the user can recognize the cracks conveniently. In this embodiment, the pixels 11 may include at least two colors of pixels 11, for example, may include blue pixels and yellow pixels, and the pixels 11 may further include three or four colors, for example, the pixels 11 may further include red pixels, blue pixels, and green pixels.
Alternatively, with continued reference to fig. 1, the detection line 13 may include a first detection line 131 and a second detection line 132 disposed to be insulated from each other; the head end 13a of the first detection line 131 is disposed near the head end 13a of the second detection line 132; the tail end 13b of the first detection line 131 is disposed near the tail end 13b of the second detection line 132; the first and second detection lines 131 and 132 are sequentially disposed around the display area AA; the head end 121 of the auxiliary detection line 12 is close to the tail end 122 of the auxiliary detection line 12; the head end 13a of the first detection line 131 is connected to the head end 121 of the auxiliary detection line 12, and the head end 13a of the second detection line 132 is connected to the tail end 122 of the auxiliary detection line 12.
In this embodiment, two detection lines 13 may be included: the first detection line 131 and the second detection line 132, the first end 13a of the two detection lines is close to the first detection line 131, the second detection line 132 is close to the second detection line 13b, the first detection line 131 and the second detection line 132 jointly surround the edge of the whole display area AA, in addition, the auxiliary detection line 12 is also in a non-closed structure comprising the first end 121 and the second end 122, as shown in fig. 1, the first end 13a of the first detection line 131 is connected with the first end 121 of the auxiliary detection line 12, the second end 122 of the auxiliary detection line 12 is connected with the first end 13a of the second detection line 132, and then the first detection line 131, the auxiliary detection line 12 and the second detection line 132 are sequentially communicated to form a communication structure, and any position of the communication structure is broken and all the broken positions can be measured through the pixels 11 connected with the first data line D1. The auxiliary detection lines 12 may be multiplexed as detection lines to detect cracks, further enhancing crack detection accuracy.
Fig. 9 is a schematic cross-sectional view of the display panel of fig. 2 along line a-a', and optionally, the display panel may include a flexible substrate 21, and a driving circuit layer 22 on the flexible substrate 21; the driving circuit layer 22 includes a plurality of thin film transistors TFTs; the driving circuit layer 22 sequentially includes, in a direction away from the flexible substrate 21: an active layer P provided with active layers of a thin film transistor TFT, a first switching transistor T1, a second switching transistor (not shown in fig. 9), and a third switching transistor (not shown in fig. 9); a first metal layer 24 provided with a gate electrode K3' of the thin film transistor TFT, a control terminal K3 of the first switching transistor T1, a control terminal of the second switching transistor, a control terminal of the third switching transistor, and a scan line; the second metal layer 25 is provided with a source electrode K1 'and a drain electrode K2' of the thin film transistor TFT, a first terminal K1 and a second terminal K2 of the first switching tube T1, a first terminal and a second terminal of the second switching tube, a data line, an auxiliary detection line 12, and a detection line 13.
In this embodiment, the active layers of the first switching transistor T1, the second switching transistor and the third switching transistor are arranged in the same layer as the active layer of the thin film transistor TFT, the control terminal K3 is arranged in the same layer as the gate electrode K3', and the first terminal K1 and the second terminal K2 are arranged in the same layer as the source electrode K1' and the drain electrode K2 '. In addition, the auxiliary detecting line 12 and the detecting line 13 are also arranged in the same layer as the source electrode K1 'and the drain electrode K2', and it should be noted that an insulating layer 23 is present between the active layer P and the first metal layer 24, specifically, a gate insulating layer 231, and an insulating layer 23 is present between the first metal layer 24 and the second metal layer 25, specifically, an interlayer insulating layer 232. The process of the crack detection circuit is the same as the original process of the display panel, and the process is not required to be additionally arranged, so that the manufacturing is convenient, and the process cost is reduced.
The embodiment of the invention also provides a display device. Fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 10, the display device according to the embodiment of the present invention includes the display panel 1 according to any embodiment of the present invention. The display device may be a mobile phone as shown in fig. 10, or may be a computer, a television, an intelligent wearable device, etc., which is not limited in this embodiment.
Based on the same conception, the embodiment of the invention also provides a crack detection method of the display panel. Fig. 11 is a flow chart of a crack detection method for a display panel according to an embodiment of the present invention, as shown in fig. 11, the method of the embodiment includes the following steps:
step S110, an auxiliary detection signal output end is controlled to output an auxiliary detection signal to an auxiliary detection line.
Step S120, outputting a third level to the control ends of the first switching tube, the second switching tube and the third switching tube through the first level output end when crack detection is carried out, so that the first switching tube, the second switching tube and the third switching tube are conducted; and judging the breaking state of the detection line and/or the auxiliary detection line by driving the pixels connected with the first data line to emit light or not and driving the pixels connected with the second data line to emit light or not.
And step 130, outputting a fourth level to the control ends of the first switching tube, the second switching tube and the third switching tube through the first level output end when the image display is performed, so that the first switching tube, the second switching tube and the third switching tube are cut off, and the auxiliary detection line is suspended.
It should be noted that the voltage difference between the third level and the fourth level is large, so as to ensure that the control terminal of the switching tube is turned on at the third level and turned off at the fourth level, that is, if the third level is high, the fourth level is low, or if the fourth level is high, the third level is low, which is not particularly limited in this embodiment.
In the embodiment of the invention, the non-display area of the display panel comprises at least one detection line and an auxiliary detection line arranged around the display area, the detection line comprises a head end and a tail end, the auxiliary detection line is connected with the head end of each detection line to realize the communication between the detection line and the auxiliary detection line, the non-display area also comprises a first switch tube, a second switch tube and a third switch tube, each detection line is connected with a corresponding first data line through at least one first switch tube, the third switch tube is used for connecting an auxiliary detection signal output end and the auxiliary detection line, the auxiliary detection line is connected with a corresponding second data line through a plurality of second switch tubes, the control ends of the three switch tubes are all connected with the first level output end and are simultaneously conducted, when the detection line is not broken, an auxiliary detection signal is transmitted to the auxiliary detection line and the detection line through the third switch tube, the first data line of the detection line drives the connected pixels to emit light or not emit light, when the detection line is broken, the auxiliary detection signal can not reach all positions of the detection line, the first data line connected with the detection line drives the connected pixels to emit light or not emit light, and in addition, the condition that the second data line drives the connected pixels to emit light or not to emit light to drive light to the detection signal through the second data line to drive the connected pixels to drive the first data lines to do not emit light. In this embodiment, the tail end of each detection line is at least connected to one first switching tube, so that when any position on the detection line breaks, the first switching tube connected to the tail end can drive the connected pixel to detect the crack. And auxiliary detection signals are transmitted to the auxiliary detection line through the third switching tube, when crack detection is not carried out, the third switching tube is not conducted, the auxiliary detection signals cannot be transmitted to the auxiliary detection line, then the terminals of the first switching tube and the second switching tube are suspended, the condition that the control ends and the source electrodes of the first switching tube and the second switching tube are simultaneously connected with the same high level is effectively avoided, so that bias voltage deviation or leakage current is not easy to occur in the first switching tube and the second switching tube, the problem that the first switching tube or the second switching tube leaks high level to a data line is avoided, the problem of dark lines of a display panel is effectively prevented, and the quality of module detection or subsequent display is improved.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (15)
1. A display panel, comprising: a display region and a non-display region surrounding the display region; the non-display area comprises at least one detection line and an auxiliary detection line arranged around the display area; each detection line comprises a head end and a tail end; the auxiliary detection lines are respectively connected with the head end of at least one detection line;
the non-display area further comprises at least one third switching tube, a plurality of first switching tubes and a plurality of second switching tubes; the third switching tube is used for transmitting an auxiliary detection signal of the auxiliary detection signal output end to the auxiliary detection line; the display area comprises a plurality of first data lines and second data lines; each detection line is connected with at least one first data line through at least one first switching tube, and at least one first switching tube is connected with the tail end of the detection line; the auxiliary detection line is connected with a plurality of second data lines through a plurality of second switching tubes; the control ends of the first switching tube, the second switching tube and the third switching tube are all connected with a first level output end; and judging the fracture state of the detection line and/or the auxiliary detection line by driving the pixels connected with the first data line to emit light or not and driving the pixels connected with the second data line to emit light or not.
2. The display panel of claim 1, wherein:
the auxiliary detection signal is used for enabling the first data line connected with the detection line to drive the connected pixels not to emit light when the detection line is not broken, and enabling the first data line connected with the detection line to drive the connected pixels to emit light when the detection line is broken.
3. The display panel of claim 1, wherein the non-display region further comprises a gate driving circuit; the grid driving circuit comprises a plurality of first shift registers which are sequentially cascaded and a plurality of second shift registers which are sequentially cascaded; the output end of the first shift register is used for outputting a grid scanning signal; the output end of the second shift register is used for outputting a light-emitting control signal;
the output end of any one of the first shift register or the second shift register is multiplexed as the auxiliary detection signal output end.
4. The display panel of claim 1, wherein each of the detection lines includes at least one intermediate connection terminal between a head end and a tail end thereof;
each intermediate connection terminal is connected with at least one first switching tube.
5. The display panel of claim 1, wherein the first level output terminal is a lighting test pad for lighting test; or,
And the output pin binding pad is used for binding the driving chip or the flexible circuit board.
6. The display panel of claim 1, wherein the non-display area includes a binding area near a first edge of the display area for binding a driving chip or a flexible circuit board;
the first switching tube and the second switching tube are arranged in a first non-display area close to the second edge of the display area; the first edge and the second edge are disposed opposite each other.
7. The display panel of claim 1, wherein the first switching tube, the second switching tube, and the third switching tube each comprise a first end, a second end, and the control end;
the first end of the first switching tube is connected with the corresponding detection line, and the second end of the first switching tube is connected with the corresponding first data line;
the first end of the second switching tube is connected with the auxiliary detection line, and the second end of the second switching tube is connected with a corresponding second data line;
the first end of the third switching tube is connected with the auxiliary detection line, and the second end of the third switching tube is connected with the auxiliary detection signal output end.
8. The display panel of claim 7, wherein the auxiliary detection signal is at a second high level; the first switching tube, the second switching tube and the third switching tube are P-type switching tubes;
the first level output end is used for outputting a first low level when crack detection is carried out; the auxiliary detection signal is used for enabling a first data line connected with the detection line to receive the second high level when the detection line is not broken; the auxiliary detection signal is also used for enabling a first data line connected with the detection line to receive a second low level when the detection line breaks;
the first level output end is also used for outputting a first high level when the image display is carried out; the auxiliary detection signal is used for enabling the third switching tube to be cut off so as to enable the auxiliary detection line to be suspended.
9. The display panel of claim 1, wherein the first data line and the second data line extend in a first direction and are sequentially disposed in a second direction; the first direction and the second direction are parallel to the plane where the display panel is located;
the first switching tube and the second switching tube are sequentially arranged along the second direction.
10. The display panel of claim 9, wherein M first data lines are disposed adjacent to each other along the second direction; m is an integer greater than 1;
p second data lines are adjacently arranged along the second direction; p is an integer greater than 1.
11. The display panel of claim 10, wherein the pixels comprise at least a first color pixel and a second color pixel;
the pixel connected with the first data line is a first color pixel; the pixel connected with the second data line is a second color pixel.
12. The display panel according to claim 1, wherein the detection lines include a first detection line and a second detection line which are disposed to be insulated from each other; the head end of the first detection line is arranged close to the head end of the second detection line; the tail end of the first detection line is arranged close to the tail end of the second detection line; the first detection line and the second detection line are sequentially arranged around the display area; the head end of the auxiliary detection line is close to the tail end of the auxiliary detection line;
the head end of the first detection line is connected with the head end of the auxiliary detection line, and the head end of the second detection line is connected with the tail end of the auxiliary detection line.
13. The display panel according to claim 1, wherein the display panel comprises a flexible substrate, and a driving circuit layer on the flexible substrate; the driving circuit layer includes a plurality of thin film transistors;
the driving circuit layer sequentially includes, in a direction away from the flexible substrate:
an active layer provided with active layers of the thin film transistor, the first switching transistor, the second switching transistor, and the third switching transistor;
the first metal layer is provided with a grid electrode of the thin film transistor, a control end of the first switch tube, a control end of the second switch tube, a control end of the third switch tube and a scanning line;
the second metal layer is provided with a source electrode and a drain electrode of the thin film transistor, a first end and a second end of the first switch tube, a first end and a second end of the second switch tube, the data line, the auxiliary detection line and the detection line.
14. A display device comprising the display panel of any one of claims 1-13.
15. A crack detection method for a display panel, adapted to the display panel of any one of claims 1 to 13, comprising:
Controlling an auxiliary detection signal output end to output an auxiliary detection signal to an auxiliary detection line;
when crack detection is carried out, a third level is output to the control ends of the first switching tube, the second switching tube and the third switching tube through the first level output end so as to conduct the first switching tube, the second switching tube and the third switching tube; judging the breaking state of the detection line and/or the auxiliary detection line by driving the pixels connected with the first data line to emit light or not and driving the pixels connected with the second data line to emit light or not;
when the image display is carried out, a fourth level is output to the control ends of the first switch tube, the second switch tube and the third switch tube through the first level output end, so that the first switch tube, the second switch tube and the third switch tube are cut off, and the auxiliary detection line is suspended.
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| JP2006084221A (en) * | 2004-09-14 | 2006-03-30 | Mitsubishi Electric Corp | Manufacturing method of semiconductor module |
| CN108154800A (en) * | 2016-12-05 | 2018-06-12 | 三星显示有限公司 | Display device |
| CN108153017A (en) * | 2016-12-06 | 2018-06-12 | 三星显示有限公司 | Display device |
| KR20190064254A (en) * | 2017-11-30 | 2019-06-10 | 엘지디스플레이 주식회사 | Display apparatus |
| CN110021641A (en) * | 2018-01-10 | 2019-07-16 | 三星显示有限公司 | Show equipment |
| KR20190140629A (en) * | 2018-06-12 | 2019-12-20 | 엘지디스플레이 주식회사 | Light emttting display device |
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| CN110858603A (en) * | 2018-08-24 | 2020-03-03 | 京东方科技集团股份有限公司 | Array substrate, detection method thereof and display device |
| CN109597226A (en) * | 2018-12-25 | 2019-04-09 | 上海天马微电子有限公司 | Display panel and display device |
| CN110136618A (en) * | 2019-05-31 | 2019-08-16 | 京东方科技集团股份有限公司 | A kind of display panel detection circuit, display device and display panel testing method |
| CN111509026A (en) * | 2020-05-27 | 2020-08-07 | 京东方科技集团股份有限公司 | Display panel, crack detection method thereof and display device |
| CN111540294A (en) * | 2020-06-04 | 2020-08-14 | 京东方科技集团股份有限公司 | Display panel, crack detection method thereof and display device |
| CN111564130A (en) * | 2020-06-11 | 2020-08-21 | 京东方科技集团股份有限公司 | Display panel, crack detection method thereof and display device |
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