Patent Publication Number: US-11385485-B2

Title: Test wiring structure, test apparatus and test system

Description:
CROSS REFERENCE OF RELATED APPLICATIONS 
     The present application claims the priority to the Chinese Patent Application No. CN201821857989.8, filed with the National Intellectual Property Administration, PRC on Nov. 12, 2018 and entitled “TEST WIRING STRUCTURE, TEST APPARATUS AND TEST SYSTEM”, which is incorporated herein by reference in its entirety. 
     TECHNICAL FIELD 
     The present application relates to the technical field of display, particularly to a test wiring structure, a test apparatus and a test system. 
     BACKGROUND 
     The statements herein merely provide background information related to the present application and do not necessarily constitute the conventional art. With the rapid development of liquid crystal display technology, people have increasingly higher requirements for the picture quality of a liquid crystal display panel. In order to ensure the display quality of the liquid crystal display panel, a Power Up Test is often required to be performed for the picture in the produced liquid crystal display panel, that is, a pressure head with a probe is pressed onto the liquid crystal display panel so that the probe is in contact with a signal input point of the liquid crystal display panel, and a corresponding test signal is input to light the liquid crystal display panel for testing, so as to determine whether the liquid crystal display panel displays normally. 
     In the traditional Power Up Test, a test pad needs to be pricked once for the test of each liquid crystal display panel, which takes much time. The test time is too long when testing a large number of liquid crystal display panels at the identical time. Therefore, the traditional Power Up Test method has low test efficiency. 
     SUMMARY 
     According to various embodiments of the present application, a test wiring structure, a test apparatus and a test system are provided. 
     A test wiring structure includes signal wirings that are sequentially cascaded, where each signal wiring includes a first interface, a second interface and a cascade interface, the first interface and the second interface being respectively located at the two ends of the signal wiring and the cascade interface being disposed on the signal wiring and positioned between the first interface and the second interface; in the sequentially cascaded signal wirings, the first interface and the second interface of a previous-stage signal wiring are respectively connected to the cascade interfaces of corresponding signal wirings in next-stage signal wirings; and the cascade interface of a first-stage signal wiring is used to connect to a test pad and the first interfaces and the second interfaces of last-stage signal wirings are respectively used to connect to corresponding display panels. 
     A test apparatus includes: test wirings including signal wirings that are sequentially cascaded, where each signal wiring includes a first interface, a second interface and a cascade interface, the first interface and the second interface being respectively located at the two ends of the signal wiring and the cascade interface being disposed on the signal wiring and positioned between the first interface and the second interface; in the sequentially cascaded signal wirings, the first interface and the second interface of a previous-stage signal wiring are respectively connected to the cascade interfaces of corresponding signal wirings in next-stage signal wirings; and the cascade interface of a first-stage signal wiring is used to connect to a test pad and the first interfaces and the second interfaces of last-stage signal wirings are respectively used to connect to corresponding display panels; probes disposed on the first interfaces and the second interfaces of the last-stage signal wirings, where the last-stage signal wirings are connected to the corresponding display panels through the probes; and the test pad disposed at the cascade interface of the first-stage signal wiring. 
     A test system includes display panels and a test apparatus including: test wirings including signal wirings that are sequentially cascaded, where each signal wiring includes a first interface, a second interface and a cascade interface, the first interface and the second interface being respectively located at the two ends of the signal wiring and the cascade interface being disposed on the signal wiring and positioned between the first interface and the second interface; in the sequentially cascaded signal wirings, the first interface and the second interface of a previous-stage signal wiring are respectively connected to the cascade interfaces of corresponding signal wiring in next-stage signal wirings; and the cascade interface of a first-stage signal wiring is used to connect to a test pad and the first interfaces and the second interfaces of last-stage signal wirings are respectively used to connect to corresponding display panels; probes disposed on the first interfaces and the second interfaces of the last-stage signal wirings, where the last-stage signal wirings are connected to the corresponding display panels through the probes; and the test pad disposed at the cascade interface of the first-stage signal wiring. 
     The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the present application will be apparent from the specification, drawings and claims. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the conventional art, the drawings required in the description of the embodiments or the conventional art will be briefly described below. Obviously, the drawings in the following description are merely some embodiments of the present application, and those of ordinary skill in the art can obtain other drawings according, to the drawings without any inventive labor. 
         FIG. 1  is a schematic diagram of a test wiring structure according to an embodiment; 
         FIG. 2  is a schematic diagram of signal wiring interfaces according to an embodiment; 
         FIG. 3  is a schematic diagram of a test wiring structure according to another embodiment; 
         FIG. 4  is a structural schematic diagram of a test apparatus according to an embodiment; and 
         FIG. 5  is a structural schematic diagram of a test system according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     To facilitate understanding of the present application, the present application will now be described in more detail with reference to the related drawings. Optional embodiments of the present application are shown in the drawings. However, the present application may be embodied in many different forms and should not be construed as being limited to the embodiments described herein. Rather, these embodiments are provided to facilitate more thorough and complete understanding of the disclosure of the present application. 
     Referring to  FIG. 1 , a test wiring structure includes sequentially cascaded signal wirings  100 . Each signal wiring  100  includes a first interface and a second interface respectively located at the two ends of the signal wiring  100  and a cascade interface disposed on the signal wiring  100 . In the sequentially cascaded signal wirings  100 , the first interface and the second interface of a previous-stage signal wiring are respectively connected to the cascade interfaces of corresponding signal wirings in next-stage signal wirings. Moreover, the cascade interface of a first-stage signal wiring  110  is used to connect to a test pad  200 , and the first interfaces and the second interfaces of last-stage signal wirings  120  are respectively used to connect to corresponding display panels  300 . 
     Specifically, a Power Up Test refers to a method of performing a lighting test of a display picture of a display panel after the display panel is produced and determining whether the display panel displays normally, and it has a good effect in terms of ensuring the display reliability of the display panel. In the Power Up Test of the display panels  300 , a set of test pads  200  are often adopted to perform the lighting test of the display panels  300  one by one, and in the test process, the test pads  200  need to be pricked every time the display panels  300  are switched, so as to ensure that the test pads  200  can perform the lighting test of the corresponding display panels  300 . This test method is only suitable for the Power Up Test of a small number of display panels  300 . However, a relatively large number of display panels  300  are often cut and divided on a identical substrate for the Power Up Test, and if the test pad  200  is pricked every time the test is performed, a large amount of time will be consumed, resulting in low efficiency of the Power Up Test. Referring to  FIG. 2 , taking a first-stage signal wiring  110  connected to the test pad  200  as an example, the first-stage signal wiring  110  has a first interface  112  and a second interface  113  respectively located at the two ends of the signal wiring and a cascade interface  111  located on the signal wiring, and each signal wiring  100  has three interfaces identical to those of the first-stage signal wiring  110 . In this solution, through the sequentially cascaded signal wires  100 , in the sequentially cascaded signal wires  100 , the first interface and the second interface of a previous-stage signal wire are respectively connected to the cascade interfaces of corresponding signal wires in next-stage signal wires, the cascade interface of the first-stage signal wire  110  is used to connect to the test pad  200 , and the first interfaces and the second interfaces of last-stage signal wires  120  are respectively used to connect to the corresponding display panels  300 . It can be understood that the signal wirings for connecting to the test pads  200  are used as the first-stage signal wirings  110 , and the signal wirings for connecting to the display panels  300  are used as the last-stage signal wirings  120 ; the previous-stage signal wirings and the next-stage signal wirings are defined in a relative sense, and in two adjacent stages of signal wirings  100 , one signal wiring  100  relatively close to the test pad  200  is used as the previous-stage signal wiring, and the signal wiring  100  relatively close to the display panel  300  (i.e., relatively far from the test pad  200 ) is used as the next-stage signal wiring. 
     It should be noted that the number of each stage of signal wirings  100  of the sequentially cascaded signal wirings  100  is sequentially increased from the first stage to the last stage, and the two interfaces of a previous-stage signal wiring are respectively connected to the cascade interfaces of two different signal wirings in next-stage signal wirings. Therefore, it can be understood as that the number of the first-stage signal wirings  110  is 1 (i.e., 2 0 ), the number of the corresponding signal wirings  100  of the following stages is sequentially 2 (i.e., 2 1 ), 4 (i.e., 2 2 ), 8 (i.e., 2 3 ) . . . , and the number of the corresponding signal wirings of the n th  stage the last-stage signal wirings  120 ) is 2 n-1  and the first interfaces and the second interfaces of the signal wirings of the n th  stage are correspondingly connected to 2 n  display panels  300 . In summary, by adopting the design method of the signal wirings  100  described above, the Power Up Test of 2 n  display panels  300  through a set of test pads  200  can be realized by designing the n-stage sequentially cascaded signal wirings  100 , and in the test process, the test pads  200  only need to be pricked once, thereby greatly shortening the time of Power Up Test of a large number of display panels  300  and effectively improving the efficiency of the Power Up Test. 
     In one or more embodiments, referring to  FIG. 3 , the signal wirings  100  have two stages, where the last-stage signal wirings include a first final-stage signal wiring  121  and a second final-stage signal wiring  122 ; the first interface of the first final-stage signal wiring  121 , the second interface of the first final-stage signal wiring  121 , the first interface of the second final-stage signal wiring  122  and the second interface of the second final-stage signal wiring  122  are respectively used to connect to corresponding display panels  300 ; and the first interface of the first-stage signal wiring  110  is connected to the cascade interface of the first final-stage signal wiring  121 , and the second interface of the first-stage signal wiring  110  is connected to the cascade interface of the second final-stage signal wiring  122 . 
     Specifically, taking two-stage signal wirings  100  as an example, the corresponding first-stage signal wiring  110  serves as a previous-stage signal wiring of the last-stage signal wiring, and the last-stage signal wiring serves as a next-stage signal wiring of the first-stage signal wiring  110 . Therefore, the cascade interface of the first-stage signal wiring  110  is used to connect to the test pad  200 , the first interface of the first-stage signal wiring  110  is connected to the cascade interface of the first final-stage signal wiring  121  in the last-stage signal wirings, the second interface of the first-stage signal wiring  110  is connected to the cascade interface of the second final-stage signal wiring  122  in the last-stage signal wirings, and the first interface and the second interface of the first final-stage signal wiring  121  and the first interface and the second interface of the second final-stage signal wiring  122  are respectively connected to different display panels  300 . Through the layout of the two-stage signal wirings  100 , the Power Up Test of four display panels  300  can be realized by adopting a set of test pads  200 , and thus the advantage of high operational convenience is provided. It can be understood that in other embodiments, the signal wirings  100  may have other stages, and accordingly the Power Up Test of a plurality of display panels  300  is realized by adopting a set of test pads  200 , so as to improve the efficiency of the Power Up Test. 
     It should be noted that in one or more embodiments, the cascade interfaces are all located at a half-resistance position of the signal wirings  100 . Specifically, when performing the Power Up Test, in order to ensure the accuracy of the test results, the cascade interfaces are disposed at the half-resistance position of the signal wirings  100 , that is, one signal wiring  100  can be divided into two signal wirings  100  with equal resistance through the point, so that the resistance of the signal wirings  100  from each display panel  300  to the test pad  200  are the identical, so as to ensure that the corresponding test signals sent by each display panels  300  are consistent when received by the test pad  200 . It can be understood that in one or more embodiments, the signal wirings  100  are identical in material, length and cross-sectional area, and in order to ensure that the resistances of the signal wirings  100  from the display panels  300  to the test pad  200  are the identical, the only thing to do is to dispose the cascade interfaces at the midpoint of each signal wiring  100 , which has the advantage of simple operation. In other embodiments, the half-resistance position of each signal wiring  100  may also be determined by other means, for example, by software simulation, and the obtained half-resistance position has the advantage of high accuracy. 
     In one or more embodiments, the signal wirings  100  each include three signal lines. Specifically, each signal wiring  100  includes three different signal lines, which respectively provide different test signals to the test pad  200 . In one or more embodiments, the three signal lines are a red signal line, a green signal line and a blue signal line, which provide gray-scale voltages, data signals, etc. to red pixel units, green pixel units and blue pixel units of the display panel  300  respectively through the test pad  200 . At this time, in all the signal wirings  100 , the red signal line is connected correspondingly to the red signal line, the green signal line is connected correspondingly to the green signal line, and the blue signal line is connected correspondingly to the blue signal line, that is, the first interface and the second interface of the red signal line in the previous-stage signal wiring are respectively connected to the cascade interfaces of corresponding red signal lines in the next-stage signal wiring, the first interface and the second interface of the green signal line in the previous-stage signal wiring, are respectively connected to the cascade interfaces of corresponding green signal lines in the next-stage signal wiring, and the first interface and the second interface of the blue signal line in the previous-stage signal wiring are respectively connected to the cascade interfaces of corresponding blue signal lines in the next-stage signal wiring. 
     It can be understood that in other embodiments, the number of the signal lines in the signal wiring  100  may be different from three. For example, in one embodiment, each signal line includes four signal lines, namely a red signal line, a green signal line, a blue signal line and a white signal line, which provide gray-scale voltages, data signals, etc. to red pixel units, green pixel units, blue pixel units and white pixel units of the display panel  300  respectively through the test pad  200 , so as to realize the Power Up Test of a plurality of display panels  300  through the identical test pad  200 . 
     The test wiring structure described above includes sequentially cascaded signal wirings, where in the sequentially cascaded signal wirings, the first interface and the second interface of a previous-stage signal wiring are respectively connected to cascade interfaces of corresponding signal wirings in next-stage signal wirings, and the first interfaces of last-stage signal wirings and the second interfaces of last-stage signal wirings are respectively connected to different display panels, and the cascade interface of the first-stage signal wiring is connected to a test pad, and thus corresponding data of the display panels can be collected through the last-stage signal wirings and sent to the test pad via the cascade interface of the first-stage signal wiring of the cascaded test wirings, and then the corresponding Power Up Test operation is completed through the test pad. Through the test wiring structure described above, the Power Up Test of a plurality of display panels can be completed only by adopting one test pad, and the pricking of the test pad is not required to be repeated in the test process. When performing Power Up Test of a plurality of display panels, compared with the traditional Power Up Test method, the pricking time can be effectively shortened, thus effectively improving the efficiency of the Power Up Test. 
     Referring to  FIG. 4 , a test apparatus includes probes  400 , a test pad  200  and test wirings having the structure as described above, where the cascade interface of a first-stage signal wiring  110  is connected to the test pad  200 , first interfaces and second interfaces of last-stage signal wirings (including a first final-stage signal wiring  121  and a second final-stage signal wiring  122 , the first interfaces being the first interface of the first final-stage signal wiring  121  and the first interface of the second final-stage signal wiring  122 , and the second interfaces being the second interface of the first final-stage signal wiring  121  and the second interface of the second final-stage signal wiring  122 ) are all arranged with the probe  400 , and the last-stage signal wirings are connected to corresponding display panels through the probes  400 . The specific structure of the test wirings is explained in detail above and will not be described here again, and it can be understood that the test wirings in the test apparatus may be the test wirings in any of the above embodiments, as long as the test of the display panels can be achieved. 
     Specifically, through the sequentially cascaded signal wirings  100 , in the sequentially cascaded signal wirings  100 , the first interface and the second interface of a previous-stage signal wiring are respectively connected to cascade interfaces of corresponding signal wirings in next-stage signal wirings, the cascade interface of the first-stage signal wiring  110  is connected to the test pad  200 , first interfaces and second interfaces of last-stage signal wirings are respectively connected with the probes  400 , and the first interfaces and the second interfaces of the last-stage signal wirings are respectively connected to corresponding display panels through the probes  400 ; when there&#39;s a need to perform Power Up Test of the display panels, the only thing to do is to press the probes  400  onto corresponding display panels, so that the probes  400  are in contact with corresponding signal contact points in the display panels, and then the Power Up Test of the display panels is completed through the Power Up Test apparatus. It can be understood that the signal wirings for connecting to the test pads  200  are used as the first-stage signal wirings  110 , and the signal wirings for connecting to the display panels are used as the last-stage signal wirings; the previous-stage signal wirings and the next-stage signal wirings are defined in a relative sense, and in two adjacent stages of signal wirings  100 , one signal wiring  100  relatively close to the test pad  200  is used as the previous-stage signal wiring, and the signal wiring  100  relatively close to the display panel (i.e., relatively far from the test pad  200 ) is used as the next-stage signal wiring. 
     It should be noted that the number of each stage of signal wirings  100  of the sequentially cascaded signal wirings  100  is sequentially increased from the first stage to the last stage, and the two interfaces of a previous-stage signal wiring are respectively connected to the cascade interfaces of two different signal wirings in next-stage signal wirings. Therefore, it can be understood as that the number of the first-stage signal wirings  110  is 1 (i.e., 2 0 ), the number of the corresponding signal wirings  100  of the following stages is sequentially 2 (i.e., 2 1 ), 4 (i.e., 2 2 ), 8 (i.e., 2 3 ) . . . , and the number of the corresponding signal wirings of the n th  stage (i.e., the last-stage signal wirings) is 2 n-1 , and the first interfaces and the second interfaces of the signal wirings of the n th  stage are correspondingly connected to 2 n  display panels. In summary, by adopting the design method of the signal wirings  100  described above, the Power Up Test of 2 n  display panels through a set of test pads  200  can be realized by designing the n-stage sequentially cascaded signal wirings  100 , and in the test process, the test pads  200  only need to be pricked once, thereby greatly shortening the time of Power Up. Test of a large number of display panels and effectively improving the efficiency of the Power Up Test. 
     Further, in one or more embodiments, taking two-stage signal wirings as an example, the cascade interface of the first-stage signal wiring  110  is used to connect to the test pad  200 , the first interface of the first-stage signal wiring  110  is connected to the cascade interface of the first final-stage signal wiring  121  in the last-stage signal wirings, the second interface of the first-stage signal wiring  110  is connected to the cascade interface of the second final-stage signal wiring  122  in the last-stage signal wirings, and the first interface and the second interface of the first final-stage signal wiring  121  and the first interface and the second interface of the second final-stage signal wiring  122  are respectively connected with probes  400 . When performing a Power Up Test, the only thing to do is to press the probes  400  onto corresponding contact points on the display panels and then input test signals to complete corresponding Power Up Test. 
     In one or more embodiments, the test pad  200  includes a micro control unit, a processing unit and a signal conversion chip, where the micro-control unit is connected to the processing unit, the processing unit is connected to the signal conversion chip, and the signal conversion chip is connected to the cascade interface of the first-stage signal wiring  110 . 
     Specifically, the micro control unit receives timing information for lighting the display panels and sends the timing information to the processing unit, the processing unit converts the processed timing information and gray-scale voltages and data signals of red, green and blue pixels generated inside into Transistor-Transistor Logic (TTL) digital signals and sends the timing information and the gray-scale voltages and the data signals of the red, green and blue pixels converted into the TTL digital signals to the signal conversion chip, and the signal conversion chip further converts the received signals into Mobile Industry Processor Interface (MIPI) signals or Embedded Display Port (EDP) signals required by interfaces of display panels and then sends them to the display panels to complete the Power Up Test of the display panels. 
     Further, in one or more embodiments, the processing unit is a Field-Programmable Gate Array (FPGA). Specifically, the FPGA enables users to combine freely so as to realize different circuit functions, and it has the advantages of higher efficiency and speed compared with the traditional processors such as a CPU, a GPU, etc. The FPGA is adopted to process timing information, convert the processed timing information and gray-scale voltages and data signals of red, green and blue pixels generated by display panels into digital signals, and send the digital signals to the signal conversion chip for processing, thereby completing the Power Up Test operation of the display panels. It can be understood that in other embodiments, the processing unit may also be other types of programmable devices, such as Programmable Array Logic (PAL), Complex Programmable Logic Device (CPLD), etc., as long as they can realize functions similar to those of the FPGA described above. 
     Continue to refer to  FIG. 4 , in one or more embodiments, the test apparatus further includes a substrate  500 , and the test pad  200 , the probes  400  and the test wirings are fixedly disposed on the substrate  500 . Specifically, taking two-stage signal wirings  100  as an example, the test pad  200 , the probes  400  and the signal wirings  100  are all fixedly disposed on the substrate  500 , and the only thing to do is to press the probes  400  fixed on the substrate  500  onto the display panels when performing the Power Up Test. Fixedly disposing the test pad  200 , the probes  400  and the signal wirings  100  on the substrate  500  helps to protect the signal wirings  100  and has the advantage of high operational convenience in the Power Up Test. Further, in one or more embodiments, the substrate  500  is a glass substrate. The glass substrate is used as the substrate  500 , and the test pad  200 , the probes  400  and the signal wirings  100  are all disposed on the glass substrate to realize the Power Up Test of the display panels, thus providing the advantages of easy realization and low cost. 
     In the test apparatus described above, the test wirings include sequentially cascaded signal wirings, where in the sequentially cascaded signal wirings, the first interface and the second interface of a previous-stage signal wiring are respectively connected to cascade interfaces of corresponding signal wirings in next-stage signal wirings, and the first interfaces of last-stage signal wirings and the second interfaces of last-stage signal wirings are respectively connected to different display panels and the cascade interface of the first-stage signal wiring is connected to a test pad, and thus corresponding data of the display panels can be collected through the last-stage signal wirings and sent to the test pad via the cascade interface of the first-stage signal wiring of the cascaded test wirings, and then the corresponding Power Up Test operation is completed through the test pad. Through the test apparatus described above, the Power Up Test of a plurality of display panels can be completed only by adopting one test pad, and the pricking of the test pad is not required to be repeated in the test process. When performing Power Up Test of a plurality of display panels, compared with the traditional Power Up Test method, the pricking time can be effectively shortened, thus effectively improving the efficiency of the Power Up Test. 
     Referring to  FIG. 5 , a test system includes display panels  300  and a test apparatus, where the test apparatus is connected to corresponding display panels  300  through probes  400 , respectively. It can be understood that the test apparatus may be specifically the test apparatus described in any of the above embodiments, and the specific structure has been explained in detail in the above embodiments and will not be described here again. 
     Specifically, in the test system, through the sequentially cascaded signal wirings  100 , in the sequentially cascaded signal wirings  100 , the first interface and the second interface of a previous-stage signal wiring, are respectively connected to cascade interfaces of corresponding signal wirings in next-stage signal wirings, the cascade interface of the first-stage signal wiring  110  is connected to the test pad  200 , first interfaces and second interfaces of last-stage signal wirings  120  are respectively connected with the probes  400 , and the first interfaces and the second interfaces of the last-stage signal wirings  120  are respectively connected to corresponding display panels  300  through the probes  400 ; when there&#39;s a need to perform Power Up Test of the display panels  300 , the only thing to do is to press the probes  400  onto corresponding display panels  300 , so that the probes  400  are in contact with corresponding signal contact points in the display panels  300 , and then the Power Up Test of the display panels  300  is completed through the Power Up Test apparatus. It can be understood that the signal wirings for connecting to the test pads  200  are used as the first-stage signal wirings  110 , and the signal wirings for connecting to the display panels  300  are used as the last-stage signal wirings  120 ; the previous-stage signal wirings and the next-stage signal wirings are defined in a relative sense, and in two adjacent stages of signal wirings  100 , one signal wiring  100  relatively close to the test pad  200  is used as the previous-stage signal wiring, and the signal wiring  100  relatively close to the display panel  300  (i.e., relatively far from the test pad  200 ) is used as the next-stage signal wiring. 
     It should be noted that the number of each stage of signal wirings  100  of the sequentially cascaded signal wirings  100  is sequentially increased from the first stage to the last stage, and the two interfaces of a previous-stage signal wiring are respectively connected to the cascade interfaces of two different signal wirings in next-stage signal wirings. Therefore, it can be understood as that the number of the first-stage signal wirings  110  is 1 (i.e., 2 0 ), the number of the corresponding signal wirings  100  of the following stages is sequentially 2 (i.e., 2 1 ), 4 (i.e., 2 2 ), 8 (i.e., 2 3 ) . . . , and the number of the corresponding signal wirings of the n th  stage the last-stage signal wirings  120 ) is 2 n-1 , and the first interfaces and the second interfaces of the signal wirings of the n th  stage are correspondingly connected to 2 n  display panels  300 . In summary, by adopting the design method of the signal wirings  100  described above, the Power Up Test of 2 n  display panels  300  through a set of test pads  200  can be realized by designing the n-stage sequentially cascaded signal wirings  100 , and in the test process, the test pads  200  only need to be pricked once, thereby greatly shortening the time of Power Up Test of a large number of display panels  300  and effectively improving the efficiency of the Power Up Test. It should be noted that, in one or more embodiments, the display panels  300  are identical in model, that is, the test of a large number of display panels  300  of the identical model can be completed by one test apparatus, which has the advantage of high testing efficiency. 
     In one or more embodiments, the display panel  300  is a Liquid Crystal Display (LCD) panel. The LCD panel is a display panel with an ultra-thin plane, and it is composed of a certain number of color pixels or black and white pixels and is placed in front of a light source or a reflecting surface. The LCD panel has the advantages of low power consumption, power saving, low radiation and soft picture, and it is widely used in daily life. The LCD panel is also required to be subjected to Power Up Test when the production is finished so as to ensure that the display picture of the LCD panel is normal. 
     In one or more embodiments, the display panel includes an array substrate disposed with pixel units arranged in an array. Specifically, the array substrate has a plurality of data lines arranged along a first direction and a plurality of scanning lines arranged along a second direction, and the plurality of data lines arranged along the first direction and the plurality of scanning lines arranged along the second direction are in insulated intersection. Pixel units arranged in an array are defined at the insulated intersection position of each data line and each scanning line, and after driving signals are provided to the pixel units through the data lines and the scanning lines, the pixel units emit light to complete image display. 
     In one or more embodiments, the pixel units include Red (R) pixel units, Green (G) pixel units and Blue (B) pixel units. In this embodiment, the signal wiring in the corresponding test wiring structure includes three signal lines, which provide gray-scale voltages, data signals, etc. to the Red pixel units, the Green pixel units and the Blue pixel units of the display panel  300  respectively through the test pad  200 . 
     In one or more embodiments, the pixel units include Red pixel units, Green pixel units, Blue pixel units and White (W) pixel units, and the corresponding signal wirings in the test wiring structure include three signal lines, which provide gray-scale voltages, data signals, etc. to the Red pixel units, the Green pixel units and the Blue pixel units of the display panel  300  respectively through the test pad  200 . 
     In one or more embodiments, the LCD panel is a Twisted Nematic (TN) panel. It can be understood that, in other embodiments, other types of display panels are also possible, for example, In-Plane Switching (IPS) panels, Multi-domain Vertical Alignment (MVA) panels, etc., as long as they are applicable. 
     In the test system described above, the test wirings include sequentially cascaded signal wirings, where in the sequentially cascaded signal wirings, the first interface and the second interface of a previous-stage signal wiring are respectively connected to cascade interfaces of corresponding signal wirings in next-stage signal wirings, and the first interfaces of last-stage signal wirings and the second interfaces of last-stage signal wirings are respectively connected to different LCD panels and the cascade interface of the first-stage signal wiring is connected to a test pad, and thus corresponding data of the LCD panels can be collected through the last-stage signal wirings and sent to the test pad via the cascade interface of the first-stage signal wiring of the cascaded test wirings, and then the corresponding Power Up Test operation is completed through the test pad. Through the test system described above, the Power Up Test of a plurality of LCD panels can be completed only by adopting one test pad, and the pricking of the test pad is not required to be repeated in the test process. When performing Power Up Test of a plurality of LCD panels, compared with the traditional Power Up Test method, the pricking time can be effectively shortened, thus effectively improving the efficiency of the Power Up Test. 
     The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features of the above embodiments are not described, and such combinations of the technical features shall be deemed to fall within the scope of the present disclosure as long as there is no contradiction. 
     The embodiments above only describe several implementations of the present application, and the description thereof is specific and detailed. However, those cannot be therefore construed as limiting the scope of the present application. It should be noted that, for those of ordinary skill in the art, several variations and modifications can be made without departing from the concept of the present disclosure, which also fall within the scope of the present disclosure. Therefore, the protection scope of the present application shall be defined by the appended claims.