Detection circuit and method of display panel and display panel

Abstract

The invention provides a detection circuit and method of a display panel and the display panel. The display panel comprises a display area and a non-display area, the display area comprises display units arranged in an array mode, the display units are configured to be arranged in the mode that every two display units form a group in the row or column arrangement direction of the display units, each display unit comprises sub-pixels with preset patterns, the sub-pixels are correspondingly matched with driving circuits, and the driving circuits are arranged in the non-display area. The sub-pixels comprise a red sub-pixel, a green sub-pixel and a blue sub-pixel, the detection circuit is located in a non-display area and electrically connected with the driving circuit, the detection circuit comprises a CT circuit used for triggering the selected sub-pixel, the CT circuit is configured to comprise an input signal line, and the input signal line is electrically connected with the driving circuit. The green sub-pixels are matched with the corresponding selection signal lines and are electrically connected with the green sub-pixels in one display unit in the same group, and the input signal lines are matched with the corresponding selection signal lines and are electrically connected with the green sub-pixels in the other display unit in the same group. In this way, the G sub-pixels are respectively controlled, and short circuit detection is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a detection circuit and method for a display panel and a display panel. Background Art

[0002] At present, the requirements for display area of ​​AMOLED products are getting higher and higher, and narrow borders have become an important development trend. In order to design the display panel with a narrow border, sectors are configured on one side (such as the lower border side) and sector routing is set for subsequent process operations, such as detection, chip or FPC binding, etc. The display panel is set up with detection processes in the array stage before evaporation and before and after chip binding. For example, the AT circuit is used for testing in the array stage, and the CT circuit is used for testing before and after chip binding after evaporation. In the current display panel detection circuit (CT circuit) design, the test equipment cannot detect the metal short circuit on the same layer of the sector (also called the fan-out area), and there is a possibility of missed detection. Summary of the invention

[0003] The purpose of the present invention is to provide a display panel detection circuit, method and display panel to solve the current problem of missed detection, improve the yield of the process, and enhance the overall yield of the product.

[0004] To achieve the above object, the present invention provides a detection circuit for a display panel, wherein the display panel includes a display area and a non-display area.

[0005] The display area includes display units arranged in an array, wherein the display units are arranged in a row or column direction in which two display units form a group, each of the display units includes sub-pixels of a preset pattern, each of the sub-pixels is matched with a corresponding driving circuit, and the sub-pixels include red sub-pixels, green sub-pixels, and blue sub-pixels.

[0006] The detection circuit is located in the non-display area and is electrically connected to the driving circuit.

[0007] The detection circuit includes a CT circuit for triggering the selected sub-pixel, and the CT circuit is configured to include an input signal line, which matches the corresponding selection signal line and is electrically connected to the green sub-pixel in a display unit in the same group, and an input signal line, which matches the corresponding selection signal line and is electrically connected to the green sub-pixel in another display unit in the same group. Through such a design, the green (G) sub-pixels (or the columns where the green (G) sub-pixels are located) in the two display units in the same group can be controlled separately during detection, and whether there is a voltage difference between the two G sub-pixels in the same group, when abnormal, the brightness difference between the abnormal pixel and the normal pixel can be obtained to detect the exact location of the defect (this is convenient for the improvement of the previous process). This method solves the problem that the same-layer metal short circuit (Short) in the Fanout area cannot be detected at present.

[0008] In one embodiment, the CT circuit is configured to include a first input signal line, a second input signal line, a third input signal line, and a fourth input signal line.

[0009] The first input signal line is electrically connected to the red sub-pixels in the two display units in the same group, the second input signal line is electrically connected to the blue sub-pixels in the two display units in the same group, the third input signal line is electrically connected to the green sub-pixels in one display unit in the same group, and the fourth input signal line is electrically connected to the green sub-pixels in another display unit in the same group.

[0010] Preferably, the first input signal line matches the corresponding first selection signal line, which is used to trigger the selected red sub-pixel; the second input signal line matches the corresponding second selection signal line, which is used to trigger the selected blue sub-pixel; the third input signal line matches the corresponding third selection signal line, which is used to trigger the selected green sub-pixel in a display unit in the same group; the fourth input signal line matches the corresponding fourth selection signal line, which is used to trigger the selected green sub-pixel in another display unit in the same group.

[0011] In one embodiment, in each of the display units, the row or column where the red sub-pixel and the blue sub-pixel are located is arranged side by side with the row or column where the green sub-pixel is located.

[0012] In one embodiment, the row or column where the red sub-pixel and the blue sub-pixel are located in one display unit in the same group is arranged side by side with the row or column where the green sub-pixel is located, and the row or column where the blue sub-pixel and the red sub-pixel are located in another display unit is arranged side by side with the row or column where the green sub-pixel is located.

[0013] Preferably, the red sub-pixel, the green sub-pixel and the blue sub-pixel are respectively matched with pixel driving circuits, which are electrically connected to the detection circuit via wiring.

[0014] Preferably, the detection circuit comprises an AT circuit,

[0015] The AT circuit includes a connection portion and a signal distribution line.

[0016] The connecting portion is used to electrically connect the AT device.

[0017] The signal distribution lines include a signal distribution line MUX_1, a signal distribution line MUX_2, a signal distribution line MUX_3 and a signal distribution line MUX_4.

[0018] The signal distribution line is configured to apply an electrical signal to the driving circuit matched with the selected sub-pixel based on an instruction during a test.

[0019] Furthermore, the AT circuit further includes a plurality of first switches, a second switch, a third switch and a fourth switch.

[0020] The trigger end of the first switch is electrically connected to the signal distribution line MUX_1, the first end is electrically connected to the red / blue sub-pixel in a display unit in the same group, and the second end is electrically connected to the second end of the second switch and the connecting portion, the first end of the second switch is electrically connected to the green sub-pixel in a display unit in the same group, and the trigger end is electrically connected to the signal distribution line MUX_2;

[0021] The trigger end of the third switch is electrically connected to the signal distribution line MUX_4, the first end is electrically connected to the blue / red sub-pixel in another display unit in the same group, the second end is electrically connected to the second end of the fourth switch and the connecting portion, the first end of the fourth switch is electrically connected to the green sub-pixel in another display unit in the same group, and the trigger end of the fourth switch is electrically connected to the signal distribution line MUX_3. The first switch, the second switch, the third switch and the fourth switch are triodes, MOS switches or metal oxide switches.

[0022] Preferably, the CT circuit is used to be electrically connected to a CT device, and comprises a plurality of input signal lines, wherein the input signal lines match corresponding selection signal lines and are used to select predetermined sub-pixels and apply electrical signals thereto.

[0023] Preferably, the selection signal line includes a first selection signal line, a second selection signal line, a third selection signal line and a fourth selection signal line, the input signal line includes a first input signal line, a second input signal line, a third input signal line and a fourth input signal line, and the CT circuit further includes:

[0024] a fifth switch, whose trigger end is electrically connected to the first selection signal line, whose first end is electrically connected to the first input signal line, whose second end is electrically connected to the second end of the sixth switch, the first end of the first switch and the red / blue sub-pixel in a display unit in the same group, whose trigger end is electrically connected to the second selection signal line, whose second end is electrically connected to the first input signal line, whose trigger end is electrically connected to the third selection signal line, whose first end is electrically connected to the third input signal line, and whose second end is electrically connected to the green sub-pixel in a display unit in the same group and the first end of the second switch;

[0025] The trigger end of the eighth switch is electrically connected to the first selection signal line, the first end is electrically connected to the first input signal line, the second end is electrically connected to the second end of the ninth switch, the first end of the ninth switch and the blue / red sub-pixel in another display unit in the same group, the trigger end of the ninth switch is electrically connected to the second selection signal line, the second end is electrically connected to the first input signal line, the trigger end of the tenth switch is electrically connected to the fourth selection signal line, the first end is electrically connected to the fourth input signal line, the second end is electrically connected to the green sub-pixel in another display unit in the same group and the first end of the fourth switch.

[0026] The embodiment of the present application provides a display panel detection method, which is used in the above-mentioned display panel detection circuit. The display panel detection method includes:

[0027] Generate test signals based on detection equipment,

[0028] inputting the test signal into the connection part and receiving a feedback signal in response to the test signal,

[0029] Determine whether the sub-pixel corresponding to the test signal and the sector wiring are short-circuited according to the feedback signal; or

[0030] Generate test signals based on detection equipment,

[0031] The test signal is input into the CT circuit,

[0032] The light and dark state of the sub-pixel corresponding to the test signal is obtained and compared with the expected light and dark state. If they are inconsistent, a short circuit occurs. This method can detect defects in the CT stage and can also detect defects in the AT stage.

[0033] An embodiment of the present application provides a display panel, which includes the above-mentioned detection circuit.

[0034] Through the detection circuit of the display panel proposed in the present application, the same-color sub-pixels in the two display units in the same group can be independently controlled during detection, and the voltage difference between adjacent same-color sub-pixels can be achieved, so that the brightness of abnormal pixels and normal pixels can be checked to detect the exact location of the defect, solving the problem of being unable to detect when the metal of the same layer in the fanout area is short. In this way, defects can be discovered and improved in time during production, the process yield can be improved, and the outflow defects can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic diagram of a display panel according to an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the arrangement of some display units in a display panel according to an embodiment of the present application;

[0038] Figure 3 A schematic diagram of a detection circuit configured on one side of a non-display area of ​​a display panel according to an embodiment of the present application;

[0039] Figure 4A schematic diagram of a part of the display units of the display panel according to an embodiment of the present application being electrically connected to a detection circuit;

[0040] Figure 5 A schematic diagram of a Fanout area in a display panel according to an embodiment of the present application being electrically connected to a CT circuit;

[0041] Figure 6 A timing diagram of the detection circuit of an embodiment of the present application during CT testing;

[0042] Figure 7 FIG. 1 is a timing diagram of the detection circuit of an embodiment of the present application during AT testing. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below with reference to the drawings in the specification to prove that the present invention can be implemented. The embodiments of the invention can fully introduce the present invention to those skilled in the art, making its technical content clearer and easier to understand. The present invention can be embodied through many different forms of embodiments of the invention, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0044] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0045] In addition, the following descriptions of the various embodiments of the invention are made with reference to the attached diagrams to illustrate specific embodiments of the invention that the present invention can be implemented with. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer description and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] When some components are described as being "on" another component, the component may be directly placed on the other component; there may also be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "mounted on" or "connected to" another component, the two may be understood to be directly "mounted on" or "connected", or one component may be indirectly "mounted on" or "connected to" another component via an intermediate component.

[0047] The production of display panels is roughly divided into the undeposited array stage (Array), the organic film formation stage (OLED) and the module stage (Module). A detection process is set up at each stage, such as the CT circuit of the sector is electrically connected to the AT device for testing in the array stage, and the CT circuit of the sector is electrically connected to the CT device before and after the chip binding after evaporation for testing to reduce the bad outflow. The applicant further analyzed the CT circuit (detection circuit) of the current display panel and found that the CT circuit has the defect of the metal short circuit in the same layer that the test equipment (AT / CT equipment) cannot detect, and there is a possibility of missed detection.

[0048] Based on the above research findings of the applicant, a detection circuit, method and display panel of a display panel are proposed. The display panel includes a display area and a non-display area, the display area includes display units arranged in an array, the display units are arranged in a group of two display units in the row or column arrangement direction, each display unit includes sub-pixels of a preset pattern, the sub-pixels include red sub-pixels, green sub-pixels and blue sub-pixels, and the sub-pixels are matched with corresponding driving circuits, and the driving circuits are electrically connected to a CT circuit. The CT circuit includes a plurality of input signal lines and a plurality of selection signal lines, and the input signal lines match and correspond to the selection signal lines. In a group of two display units, an input signal line is included, which matches the corresponding selection signal line and is electrically connected to the green sub-pixel (or the column in which it is located) in a display unit in the same group, and an input signal line is matched with the corresponding selection signal line and is electrically connected to the green sub-pixel (or the column in which it is located) in another display unit in the same group. The CT circuit is used to trigger the selected sub-pixel (or the column in which it is located). In this way, based on the coordination of the input signal line and its corresponding selection signal line during testing, the two green sub-pixels in the same group (or the columns they are in) can be independently controlled. In this way, when a defect occurs, the defect can be detected and the exact location of the defect can be identified, which is convenient for improving the previous process to improve the process yield and the overall product yield. Preferably, the selected red / blue sub-pixel or the column it is in can also be triggered.

[0049] Next, the detection circuit, method and display panel of the display panel proposed in the present application are described in detail with reference to the accompanying drawings.

[0050] The display panel has a display area and a non-display area outside the display area. The display area is used to display a predetermined pattern. In the non-display area, a sealing dam, wiring / routing, and detection circuits can be set. The red / green / blue sub-pixels are also called R / G / B sub-pixels.

[0051] like Figure 1 FIG. 1 is a schematic diagram of a display panel according to an embodiment of the present application. Figure 1As shown, the display panel includes a display area 110 (also called AA area) and a non-display area 120 (also called NA area). Display area AA is provided with regularly arranged display units (not shown), each display unit includes sub-pixels (such as R / G / B sub-pixels) of a preset arrangement pattern, and the arrangement design of the sub-pixels is such that the R / B sub-pixels are arranged in a row or a column, and the rows / columns composed of the G sub-pixels and the R / B sub-pixels are designed side by side. The R / G / B sub-pixels are respectively wired and electrically connected to their matching pixel driving circuits and a detection circuit (such as the back side of the CT circuit / AT circuit display area AA) is configured on one side of the non-display area NA, and the wiring anomalies are checked or the wiring anomalies of the fan-out area are detected by the detection circuit (located at the back of the display area after the part is folded in the module state). Preferably, a binding area for IC binding is also provided on the detection circuit side. Various preset colors can be presented by adjusting the ratio of the three primary colors emitted by the R / G / B sub-pixels during display.

[0052] like Figure 3 The figure shows a schematic diagram of the arrangement of a CT circuit 130 and an AT circuit 150 configured on one side of the non-display area 120 of a display panel according to an embodiment of the present application. In the array stage, the CT circuit 130 of the sector is electrically connected to the AT device for testing. The AT circuit 150 has a connection part (also called AT Pad). During the detection, the AT device electrically connects the connection part (also called AT Pad) through the pin of the connector (probe) configured by it, and applies an electrical signal to it. The detection module configured by the AT device receives the feedback signal in response to the applied signal for processing (such as determining whether an abnormality / short circuit occurs). The AT device can use an existing detection device, which can realize applying a signal to the AT Pad and detecting / identifying whether the fan-out wiring is abnormal, and is not limited here. The non-display area 120 of the display panel is also provided with a binding area 140, which is used to bind a driving module (such as an IC), so that after binding, the display panel can be lit up (display a preset screen) according to a program-controlled mode.

[0053] like Figure 3 The diagram shows the arrangement of sub-pixels of some display units in a row in the display area AA of a display panel according to an embodiment of the present application. In this manner, R / B sub-pixels or B / R sub-pixels are arranged in a row and are designed side by side with the column where the G sub-pixels are located.

[0054] like Figure 3As shown, only four consecutive display units are shown in a row, two of which are grouped together (i.e., one configuration cycle). In one group, one display unit is configured so that the R / B sub-pixels are arranged in a row and are designed side by side with the G sub-pixel column, and the other display unit is configured so that the B / R sub-pixels are arranged in a row and are designed side by side with the G sub-pixel column. Part of the routing of the R / B sub-pixels is multiplexed and electrically connected to the AT circuit and the CT circuit. Part of the routing multiplexing of the sub-pixels is a prior art and is not described in detail herein.

[0055] Figure 4 for Figure 3 A topological diagram of the electrical connection of sub-pixels of some display units in a row in the display area AA of the embodiment shown is a detection circuit (CT circuit and AT circuit). In this manner, the R / B / G sub-pixels in each display unit are arranged such that the R / B sub-pixels or the B / R sub-pixels are arranged in a row and are aligned with the G sub-pixels in the row. Figure 4 Only four display units are shown, two of which are grouped together.

[0056] The AT circuit includes a connection part (also called AT Pad) and a signal distribution line. Figure 4 Taking four consecutive display units (display units 221 / 222 / 223 / 224) in a row as an example, the four display units are divided into two groups (i.e., two configuration cycles), and each group matches a corresponding connection part (also called AT Pad) 241 and four switches T1 / T2 / T3 / T4, which can be MOS switches or metal oxide switches, and four signal distribution lines MUX_1 / MUX_2 / MUX_3 / MUX_4.

[0057] The trigger end of the first switch T1 is electrically connected to the signal first distribution line MUX_1, the first end of the first switch T1 is electrically connected to the R / B sub-pixel in the display unit 211, and the second end is electrically connected to the second end of the second switch T2 and the connecting part 241; the first end of the second switch T2 is electrically connected to the G sub-pixel in the display unit 211, and the trigger end of the second switch T2 is electrically connected to the signal second distribution line MUX_2.

[0058] The trigger end of the third switch T3 is electrically connected to the fourth signal distribution line MUX_4, the first end of the third switch T3 is electrically connected to the R / B sub-pixel in the display unit 212, the second end of the third switch T3 is electrically connected to the second end of the fourth switch T4 and the connecting portion 241, the first end of the fourth switch T4 is electrically connected to the G sub-pixel in the display unit 212, and the trigger end of the fourth switch T4 is electrically connected to the third signal distribution line MUX_3. Through such a design, the G sub-pixels (or the columns in which they are located) in the two display units in each group can be controlled separately, and the Short (short circuit) caused by the metal residue in the Fanout area of ​​the wiring corresponding to the G sub-pixel can be detected. In this embodiment, only 4 display units are shown (two consecutive display units are grouped, such as display units 211 / 212 are grouped, and display units 213 / 214 are grouped), and the sub-pixels in each display unit are arranged in 2 columns, and the column where the G sub-pixel is located is side by side with the column where the R / B sub-pixel is located. In a preferred embodiment, the number of groups of display units in each column of the display unit may depend on the resolution of the application scenario and is not limited here. Each group of display units is connected to the signal distribution line and the corresponding connecting terminal (also called AT Pad) through wiring.

[0059] The CT circuit is configured to include a selection signal line, please refer to Figure 4 , taking four consecutive display units in a row as an example, two display units are grouped together, such as display units 211 / 212 are grouped together, and display units 213 / 214 are grouped together. Preferably, each selection signal line is configured with a selection switch, and the corresponding selection signal line is selected by triggering the selection switch, such as triggering the selection switch to select the selection signal line corresponding to SW_1, and the selection switch can be a thin film transistor switch, a MOS switch, or a metal oxide switch). Input signal lines, such as four input signal lines including a first input signal line D_R, a second input signal line D_B, a third input signal line D_G_1, and a fourth input signal line D_G_2, apply a preset voltage to the selected sub-pixel through the input signal line to determine whether the wiring / routing corresponding to the sub-pixel is short-circuited (whether a short circuit occurs in the Fanout area).

[0060] The trigger end of the fifth switch T5 is electrically connected to the first selection signal line SW_1, the first end of the fifth switch T5 is electrically connected to the first input signal line D_R, and the second end is electrically connected to the second end of the sixth switch T6, the first end of the first switch T1 and the R / B sub-pixel in the display unit 211; the trigger end of the sixth switch T6 is electrically connected to the second selection signal line SW_2, and the second end of the sixth switch T6 is electrically connected to the second input signal line D_B.

[0061] The trigger end of the seventh switch T7 is electrically connected to the third selection signal line SW_3, the first end of the seventh switch T7 is electrically connected to the third input signal line D_G_1, and the second end of the seventh switch T7 is electrically connected to the G sub-image in the display unit 211 and the first end of the second switch T2.

[0062] The trigger end of the eighth switch T8 is electrically connected to the first selection signal line SW_1, the first end of the eighth switch T8 is electrically connected to the first input signal line D_R, and the second end is electrically connected to the second end of the ninth switch T9, the first end of the ninth switch T9 and the R / B sub-pixel in the display unit 212; the trigger end of the ninth switch T9 is electrically connected to the second selection signal line SW_2, and the second end of the ninth switch T9 is electrically connected to the second input signal line D_B.

[0063] The trigger end of the tenth switch T10 is electrically connected to the fourth selection signal line SW_4, the first end of the tenth switch T10 is electrically connected to the fourth input signal line D_G_2, and the second end of the tenth switch T10 is electrically connected to the G sub-pixel in the display unit 212 and the first end of the fourth switch T4. In this embodiment, the display units are regularly arranged in rows, and on the same row, two adjacent display units can be regarded as a group. In an actual embodiment, the number of groups depends on the resolution of the display panel and is not limited here. Through such a design, it is possible to control the G sub-pixels or the columns in which they are located in two display units in a group separately. If metal residue occurs in the Fanout area corresponding to the wiring of the G sub-pixel, it can be detected in time during detection. The Fanout area 260 is configured between the AA area and the CT circuit. Figure 5 As shown, Figure 5 Schematic diagram of the display area being electrically connected to the Fanout area, through which the wiring of the driving circuit of the R / B / G sub-pixel in the AA area is electrically connected to the detection circuit via the fan-out.

[0064] During the test, the CT circuit is electrically connected to the CT device, and the sub-pixels (or the columns thereof) in the selected display unit are lit up through the cooperation of the CT device, the selection signal lines and the input signal lines (SW_1 / SW_2 / SW_3 / SW_4 and the first input signal line D_R, the second input signal line D_B, the third input signal line D_G_1 and the fourth input signal line D_G_2), so as to detect / identify whether the fan-out wiring of the Fanout area 260 is abnormal (short-circuited). The CT device has an image acquisition device, through which the brightness of the selected sub-pixel during the test is acquired, and compared with the preset brightness, to detect / identify whether the fan-out wiring of the Fanout area 260 is abnormal (short-circuited).

[0065] Preferably, the first input signal line is used to input a signal corresponding to a red sub-pixel into the display unit, the second input signal line is used to input a signal corresponding to a blue sub-pixel into the display unit, the third input signal line is used to input a signal corresponding to a green sub-pixel into one of adjacent display units in the same row, and the fourth input signal line is used to input a signal corresponding to a green sub-pixel into another of adjacent display units in the same row.

[0066] In other embodiments, when the display units are arranged in columns as rules, the first input signal line is used to input a signal corresponding to a red sub-pixel into the display unit, the second input signal line is used to input a signal corresponding to a blue sub-pixel into the display unit, the third input signal line is used to input a signal corresponding to a green sub-pixel into one of the adjacent display units in the same column, and the fourth input signal line is used to input a signal corresponding to a green sub-pixel into another of the adjacent display units in the same column.

[0067] Next structure Figure 6 and Figure 7 and participate Figure 4 To describe the operation of the detection circuit of the embodiment of the present application.

[0068] like Figure 6 The figure shows the timing diagram of the detection circuit during CT test; Figure 7 FIG. 1 is a timing diagram of the detection circuit of an embodiment of the present application during AT testing.

[0069] During AT testing, the test signal is generated based on the detection equipment.

[0070] The test signal is input into the connection part, and a feedback signal in response to the test signal is received,

[0071] The feedback signal is used to determine whether the sub-pixel corresponding to the test signal matches the corresponding sector routing (whether a short circuit occurs). The test end of the AT device is electrically connected to the connection end of the AT circuit, and a voltage signal is applied to it. The timing is as follows: Figure 7 As shown, in the t1 stage, short circuit detection is performed between G sub-pixels. At this time, MUX_2 is at a low level, D_G_1 is at a low level, and SW_3 and SW_4 are both at low levels. In the t2 stage, short circuit detection is performed between R / B column pixels. At this time, MUX_1 is at a low level, D_B is at a low level, and SW_2 is both at a low level. The detection mechanism of this embodiment: short detection is performed in the t1 / t2 stage. When there is a short, the test current of the connection end (AT Pad) is large, otherwise it is close to 0A. In this embodiment, the control strategy adopts low level effective, and in other embodiments, high level effective can be adopted. In the t2 stage, short circuit detection is performed between G sub-pixels.

[0072] During CT testing, test signals are generated based on the detection equipment.

[0073] The test signal is input into the CT circuit,

[0074] The light and dark state of the sub-pixel corresponding to the test signal is obtained, and compared with the expected light and dark state. If they are inconsistent, a short circuit occurs. This method can detect defects in the CT stage, and can also detect defects in the AT stage. The test end of the CT device is electrically connected to the CT circuit (electrically connected to SW_1 / SW_2 / SW_3 / SW_4, the first input signal line D_R, the second input signal line D_B, the third input signal line D_G_1 and the fourth input signal line D_G_2), and the Fanout area G column sub-pixel Data is detected. If there is no short circuit (short), the 2nd and 6th columns of pixels are bright, and the 4th and 8th columns of pixels are dark; when there is a short in the Fanout area G pixel Data, the display unit shows that two adjacent columns of G pixels are lit, and the single brightness is weak, based on which it can be judged whether a short circuit occurs.

[0075] The embodiment of the present application further provides a display panel, which includes the detection circuit of the display panel in the above embodiment. The detection circuit can be arranged in the non-display area of ​​the display panel. The above display panel can be a display screen on VR / AR, a car display screen, a display screen of a mobile phone, a tablet, a PDA, an IPAD and other devices, etc., which is not limited here.

[0076] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the detection method embodiment and the display panel embodiment, the relevant parts can refer to the description part of the detection circuit embodiment. According to the embodiments of the present application as described above, these embodiments do not describe all the details in detail, nor do they limit the application to only the specific embodiments described.

[0077] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A detection circuit for a display panel, characterized in that: The display panel includes a display area and a non-display area. The display area includes display units arranged in an array, wherein the display units are arranged in a row or column direction in which two display units form a group, and each of the display units includes sub-pixels of a preset pattern, and the sub-pixels are matched with corresponding drive circuits. The detection circuit is located in the non-display area and is electrically connected to the driving circuit. The detection circuit includes a CT circuit for triggering the selected sub-pixel, and the CT circuit is configured to include an input signal line, which matches the corresponding selection signal line and is electrically connected to the green sub-pixel in a display unit in the same group, and an input signal line, which matches the corresponding selection signal line and is electrically connected to the green sub-pixel in another display unit in the same group.

2. The detection circuit of the display panel according to claim 1, characterized in that: The sub-pixels include a red sub-pixel, a green sub-pixel and a blue sub-pixel, the display unit includes a red sub-pixel and a blue sub-pixel and / or the display unit includes two green sub-pixels; The CT circuit is configured to include a first input signal line, a second input signal line, a third input signal line and a fourth input signal line, The first input signal line is electrically connected to the red sub-pixels in the two display units in the same group, the second input signal line is electrically connected to the blue sub-pixels in the display unit in the same group, the third input signal line is electrically connected to the green sub-pixels in one display unit in the same group, and the fourth input signal line is electrically connected to the green sub-pixels in another display unit in the same group. Preferably, the first input signal line matches the corresponding first selection signal line, which is used to trigger the selected red sub-pixel; the second input signal line matches the corresponding second selection signal line, which is used to trigger the selected blue sub-pixel; the third input signal line matches the corresponding third selection signal line, which is used to trigger a green sub-pixel in the selected display unit of the same group; the fourth input signal line matches the corresponding fourth selection signal line, which is used to trigger another green sub-pixel in the selected display unit of the same group.

3. The detection circuit of the display panel according to claim 1, characterized in that: In each of the display units, the row or column where the red sub-pixel and the blue sub-pixel are located is arranged side by side with the row or column where the green sub-pixel is located.

4. The detection circuit of the display panel according to claim 1, characterized in that: In one display unit in the same group, the row or column where the red sub-pixel and the blue sub-pixel are located is arranged side by side with the row or column where the green sub-pixel is located, and in another display unit, the row or column where the blue sub-pixel and the red sub-pixel are located is arranged side by side with the row or column where the green sub-pixel is located, Preferably, the red sub-pixel, the green sub-pixel and the blue sub-pixel are respectively matched with pixel driving circuits, which are electrically connected to the detection circuit via wiring.

5. The detection circuit of the display panel according to claim 1, characterized in that: The detection circuit includes an AT circuit, The AT circuit includes a connection portion and a signal distribution line. The connecting portion is used to electrically connect the AT device. The signal distribution lines include a signal distribution line MUX_1, a signal distribution line MUX_2, a signal distribution line MUX_3 and a signal distribution line MUX_4. The signal distribution line is configured to apply an electrical signal to the driving circuit matched with the selected sub-pixel based on an instruction during a test.

6. The detection circuit of the display panel according to claim 5, characterized in that: The AT circuit further includes a plurality of first switches, a second switch, a third switch and a fourth switch. The trigger end of the first switch is electrically connected to the signal distribution line MUX_1, the first end is electrically connected to the red / blue sub-pixel in a display unit in the same group, and the second end is electrically connected to the second end of the second switch and the connecting portion, the first end of the second switch is electrically connected to the green sub-pixel in a display unit in the same group, and the trigger end is electrically connected to the signal distribution line MUX_2; The trigger end of the third switch is electrically connected to the signal distribution line MUX_4, the first end is electrically connected to the blue / red sub-pixel in another display unit in the same group, the second end is electrically connected to the second end of the fourth switch and the connecting part, the first end of the fourth switch is electrically connected to the green sub-pixel in another display unit in the same group, and the trigger end of the fourth switch is electrically connected to the signal distribution line MUX_3.

7. The detection circuit of the display panel according to claim 6, characterized in that: The first switch, the second switch, the third switch and the fourth switch are respectively triodes, MOS switches or metal oxide switches.

8. The detection circuit of the display panel according to claim 1, characterized in that: The CT circuit is used to be electrically connected to the CT device, and includes a plurality of input signal lines, wherein the input signal lines match corresponding selection signal lines and are used to select predetermined sub-pixels and apply electrical signals thereto. Preferably, the selection signal line includes a first selection signal line, a second selection signal line, a third selection signal line and a fourth selection signal line, the input signal line includes a first input signal line, a second input signal line, a third input signal line and a fourth input signal line, and the CT circuit further includes: a fifth switch, whose trigger end is electrically connected to the first selection signal line, whose first end is electrically connected to the first input signal line, whose second end is electrically connected to the second end of the sixth switch, the first end of the first switch and the red / blue sub-pixel in a display unit in the same group, whose trigger end is electrically connected to the second selection signal line, whose second end is electrically connected to the first input signal line, whose trigger end is electrically connected to the third selection signal line, whose first end is electrically connected to the third input signal line, and whose second end is electrically connected to the green sub-pixel in a display unit in the same group and the first end of the second switch; The trigger end of the eighth switch is electrically connected to the first selection signal line, the first end is electrically connected to the first input signal line, the second end is electrically connected to the second end of the ninth switch, the first end of the ninth switch and the blue / red sub-pixel in another display unit in the same group, the trigger end of the ninth switch is electrically connected to the second selection signal line, the second end is electrically connected to the first input signal line, the trigger end of the tenth switch is electrically connected to the fourth selection signal line, the first end is electrically connected to the fourth input signal line, the second end is electrically connected to the green sub-pixel in another display unit in the same group and the first end of the fourth switch.

9. A method for detecting a display panel, characterized in that: A detection circuit for a display panel according to any one of claims 1 to 8, wherein the detection method of the display panel comprises: Generate test signals based on detection equipment, inputting the test signal into the connection part and receiving a feedback signal in response to the test signal, Determine whether the sub-pixel corresponding to the test signal and the sector wiring are short-circuited according to the feedback signal; or Generate test signals based on detection equipment, The test signal is input into the CT circuit, The light and dark state of the sub-pixel corresponding to the test signal is obtained and compared with the expected light and dark state. If they are inconsistent, a short circuit occurs.

10. A display panel, characterized in that: The method comprises the detection circuit as claimed in any one of claims 1 to 8.

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