Detection Circuit for Display Panel Chip Separation Detection, Detection Method and System Thereof

Abstract

The present invention discloses a detection circuit, a detection method and a system for detecting the splitting of a display panel. The method includes pre-measuring the conductive metal lines of the display panel to obtain electrical parameters; selecting a reading range suitable for detecting the splitting of the panel according to the electrical parameters; determining the compensation range of the passive component unit and determining the group of electronic components used through detecting the process variation situation according to the reading range; and detecting the splitting of the panel with the group of electronic components used as a reference based on the reading range. The system includes a pre-measurement module, a reading range module, a compensation range module and a detection module which are connected to each other. The detection circuit includes a detection unit, a passive component unit and a control selection unit. The technical solution of the present invention can increase the reading range for detecting the splitting of the display panel, enable the detection circuit to be applicable to more specifications of display panels, improve the accuracy of detecting the splitting of the display panel and increase the yield of the production process.

Description

Technical Field

[0001] The present invention relates to the technical field of display panel detection, and particularly to a detection circuit, a detection method and a detection system for detecting the chipping of a display panel. Background Art

[0002] At present, flat panel display products have been widely used in life. The increasing demand requires an increase in production capacity to meet. However, in the manufacturing process of display panels, there are objectively process damage factors. For example, the transportation and bonding of large glass substrates and the panel cutting and assembly processes may cause the display panel to be at risk of cracking due to external forces, especially small cracks in the glass as shown in Figure 1 . These risks have a very important impact on the improvement of the production yield of display panels. Therefore, display panel manufacturers need to add a chipping detection mechanism on the panel (Panel), lay conductive materials outside the panel display area, and then detect the occurrence of chipping by designing a mechanism for reading the circuit, so as to improve the reliability of the product and the production yield.

[0003] As shown in Figure 2 is an application of a PCD (Panel Crack Detection) design in the prior art. Conductive metal wires are arranged in the non-display area of the object to be detected (Panel), and the condition of the corresponding panel chipping can be judged by judging the resistance value of the conductive metal wires.

[0004] As shown in Figure 3 is a chipping detection circuit in the prior art. This kind of circuit generally adopts a MOS (abbreviation of MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide-semiconductor field-effect transistor) SW (abbreviation of Switch, switch) circuit, and is equipped with two groups of MOS control switches at the PCD input end to control the opening of the PCD function.

[0005] As shown in Figure 4Shown is the pattern of configuring conductive metal wires in the prior art. By using the loop detection method, the resistance value of the object to be measured is read, and whether there is a phenomenon of panel cracking is judged by measuring the resistance on the detection loop. Currently, PCD is basically designed to match the size of the object to be measured, so the measurable range of resistance values is not large. Some designs are even directly configured on the object to be measured, so the application flexibility of the detection circuit (mechanism) is not large. Moreover, the integrated circuit detection circuit (mechanism) also has the problem of poor detection accuracy, mainly due to the process variation in integrated circuit manufacturing. In addition, for different specifications (sizes or conductive metal materials) of the object to be measured, it is necessary to increase the measurable range of the object to be measured, improve the detection technology, and integrate integrated circuit technology, and use the reading circuit to improve the detection flexibility of PCD. Summary of the Invention

[0006] One of the purposes of the present invention is to overcome the deficiencies of the prior art. In view of the problems of small measurable range and application flexibility existing in the loop detection method in the prior art, a detection circuit, a detection method and a system for detecting panel cracking of a display panel are provided.

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] In a first aspect, the present invention provides a detection method for a detection circuit for detecting panel cracking of a display panel, and the detection method includes:

[0009] For the same type of display panel, pre-measure the conductive metal wires arranged on at least one of the display panels to obtain the electrical parameters corresponding to the same type of display panel;

[0010] According to the electrical parameters, select a reading range suitable for detecting panel cracking of the same type of display panel from a plurality of levels pre-designed in the passive component unit;

[0011] According to the reading range, determine the compensation range for compensating the passive component unit through process variation detection to determine the group of electronic components selected in the passive component unit;

[0012] Use the group of electronic components selected in the passive component unit to detect panel cracking of the same type of display panel based on the reading range and output the detection result.

[0013] In a preferred embodiment of the present application, in the step of selecting a reading range suitable for detecting panel cracking of the same type of display panel from a plurality of levels pre-designed in the passive component unit according to the electrical parameters, it specifically includes:

[0014] Design multiple levels in advance in the passive component unit, and each level is respectively composed of predetermined values of different numbers of electronic components in the passive component unit;

[0015] Compare the value of the electrical parameter with the values of the multiple levels, and divide the multiple levels into a first part larger than the value of the electrical parameter and a second part smaller than the value of the electrical parameter;

[0016] In the first part, select the level with the smallest value as the upper limit of the reading range for panel crack detection, and in the second part, select the level with the largest value as the lower limit of the reading range for panel crack detection, so as to obtain the reading range.

[0017] In a preferred embodiment of the present application, according to the reading range, determine the compensation range for compensating the passive component unit by detecting the process variation situation, so as to determine the specific content in the group of electronic components selected in the passive component unit, including:

[0018] Select a group of electronic components to be tested in the passive component unit according to the reading range and the predetermined value of a single electronic component;

[0019] Detect the actual value of a single electronic component in the group of electronic components to be tested;

[0020] Calculate the difference between the predetermined value and the actual value of a single electronic component, and combine the number of electronic components in the group of electronic components to be tested to obtain the compensation range corresponding to the reading range;

[0021] According to the compensation range, select a group of electronic components for compensation that need to be added to or removed from the group of electronic components to be tested in the passive component unit;

[0022] Based on the group of electronic components to be tested and the group of electronic components for compensation, determine the group of electronic components used for panel crack detection.

[0023] In a preferred embodiment of the present application, when performing the pre-measurement, calculate the pre-measurement values of the conductive metal wires on multiple display panels to obtain the electrical parameters corresponding to the same type of display panel.

[0024] In a preferred embodiment of the present application, the values of the multiple levels designed in advance are {5, 20, 40, 80, 160, 320, 640, 1028} kΩ respectively.

[0025] In a second aspect, the present invention provides a detection system for a detection circuit for detecting panel cracks of a display panel. The detection system includes a pre-measurement module, a reading range module, a compensation range module, and a detection module that are connected to each other;

[0026] The pre-measurement module is used to pre-measure the conductive metal wires arranged on at least one display panel of the same type of display panel, and obtain the electrical parameters corresponding to the same type of display panel;

[0027] The reading range module is used to select a reading range suitable for detecting panel splitting of the same type of display panel from a plurality of levels pre-designed in the passive component unit according to the electrical parameters;

[0028] The compensation range module is used to determine the compensation range for compensating the passive component unit according to the reading range through process variation detection, so as to determine the electronic component usage group selected in the passive component unit;

[0029] The detection module is used to detect panel splitting of the same type of display panel with the reading range as a reference through the electronic component usage group selected in the passive component unit, and output a detection result.

[0030] In a third aspect, the present invention provides a detection circuit for detecting panel splitting of a display panel. The detection circuit includes a detection unit, a passive component unit, and a control selection unit. The passive component unit is connected to the detection unit, and the control selection unit is connected to the passive component unit;

[0031] A detection system for the detection circuit for detecting panel splitting of a display panel as described in the second aspect is provided in the detection unit;

[0032] The detection system determines the reading range of the passive component unit through the control selection unit according to the electrical parameters of the display panel obtained by detection, and determines the electronic component usage group selected in the passive component unit according to the compensation range obtained by process variation detection through the control selection unit. Then, panel splitting of the same type of display panel is detected with the reading range as a reference, and finally a detection result is output.

[0033] In a preferred embodiment of the present application, a plurality of electronic components, a selection switch, a correction increase switch, and a correction reduction switch connected to the electronic components are provided in the passive component unit, and a reading range encoder and a compensation range encoder are provided in the control selection unit;

[0034] N electronic components connected in parallel with a single selection switch form a group of electronic components to be measured;

[0035] In the group of electronic components to be measured, M of the electronic components are connected in parallel with the correction reduction switch, and M of the electronic components adjacent thereto are connected in parallel with the correction increase switch outside the group of electronic components to form a group of electronic component compensation;

[0036] Among them, different reading ranges correspond to different N, and the range of M / N is between 10% and 20%;

[0037] The reading range encoder finds the reading range corresponding to the electrical parameters according to the electrical parameters obtained by the detection system, selects N corresponding to the reading range, and controls the corresponding selection switch to activate the corresponding group of electronic components to be tested;

[0038] The compensation range encoder selects and controls the correction reduction switch to remove M electronic components from the group of electronic components to be tested, or selects and controls the correction increase switch to add M electronic components to the group of electronic components to be tested, so as to form a group of electronic components for panel crack detection.

[0039] In a fourth aspect, the present invention provides a computer-readable storage medium, in which a computer program is stored. When it runs on a computer, it causes the computer to execute the detection method of the detection circuit for detecting cracks in a display panel as described in the first aspect.

[0040] In a fifth aspect, the present invention provides a computer program product, which includes a computer program. When it runs on a computer, it causes the computer to execute the detection method of the detection circuit for detecting cracks in a display panel as described in the first aspect.

[0041] The detection circuit, detection method and system for detecting cracks in a display panel disclosed by the present invention increase the reading range of the display panel crack detection, enable the detection circuit to be applicable to more specifications of display panels, and can improve the accuracy of the display panel crack detection and increase the production process yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention is described with the aid of the following drawings:

[0043] Figure 1 is a schematic diagram of a cracked display panel;

[0044] Figure 2 is a schematic diagram of arranging conductive metal wires in the non-display area of the display panel for panel crack detection;

[0045] Figure 3 is a schematic diagram of a detection circuit for detecting cracks in a cracked display panel;

[0046] Figure 4 is different ways of arranging conductive metal wires when detecting cracks in a display panel;

[0047] Figure 5It is a schematic flowchart of the detection method of the detection circuit for detecting the fracture of the display panel in Embodiment 1 of the present invention;

[0048] Figure 6 It is a specific schematic flowchart of S200 in the detection method of the detection circuit for detecting the fracture of the display panel in Embodiment 1 of the present invention;

[0049] Figure 7 It is a specific schematic flowchart of S300 in the detection method of the detection circuit for detecting the fracture of the display panel in Embodiment 1 of the present invention;

[0050] Figure 8 It is a schematic diagram of the modules of the detection system of the detection circuit for detecting the fracture of the display panel in Embodiment 2 of the present invention;

[0051] Figure 9 It is a schematic diagram of the detection circuit for detecting the fracture of the display panel in Embodiment 3 of the present invention;

[0052] Figure 10 It is a schematic diagram of the internal structure of the control selection unit in the detection circuit for detecting the fracture of the display panel in Embodiment 3 of the present invention;

[0053] Figure 11 It is an internal schematic diagram of the passive component unit in the detection circuit for detecting the fracture of the display panel in Embodiment 3 of the present invention.

[0054] Reference numerals:

[0055] 10 - Detection system; 11 - Pre - measurement module; 12 - Reading range module; 13 - Compensation range module; 14 - Detection module; 20 - Detection circuit; 21 - Detection unit; 22 - Passive component unit; 23 - Control selection unit; 24 - Reading range encoder; 25 - Compensation range encoder. Detailed implementation manners

[0056] For a better understanding of the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0057] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0058] With the continuous progress of integrated circuit technology, the continuous improvement of the physical measurement technology of nature in miniaturization and chipization in recent years has enabled the PCD (Panel Crack Detection) technology to be applied to existing products. However, there are still many areas for improvement and adjustment at the initial stage of the development of this technology. Among them, the detection accuracy of the display panel to be measured is the bottleneck, and there are also variable factors of process variation in the design of the components configured in the integrated detection circuit, which brings greater inaccuracy. Therefore, the present invention provides a detection circuit, a detection method and a system for detecting cracks in a display panel, which compensate for the variations of the display panel to be measured and the detection circuit respectively, increase the reading range and can adjust the reading range by controlling the selection unit, and then use the compensation mechanism for the passive component unit to improve the accuracy of the detection circuit for reading the electrical parameters of the display panel to be measured.

[0059] Embodiment 1

[0060] Embodiment 1 of the present invention discloses a detection method for a detection circuit for detecting cracks in a display panel, which improves the detection accuracy of panel cracks and the applicable range of display panel specifications by expanding the selection of the reading range of the passive component unit and compensating for the problem of poor accuracy caused by process variation of the passive component unit.

[0061] See Figure 5 , the detection method of this Embodiment 1 includes:

[0062] S100: For display panels of the same type, pre-measure the conductive metal wires arranged on at least one of the display panels to obtain the electrical parameters corresponding to the display panels of the same type;

[0063] S200: According to the electrical parameters, select a reading range suitable for detecting panel cracks in display panels of the same type from multiple levels pre-designed in the passive component unit;

[0064] S300: According to the reading range, determine the compensation range for compensating the passive component unit through detecting the process variation situation, so as to determine the group of electronic components selected in the passive component unit;

[0065] S400: Use the group of electronic components selected in the passive component unit to detect panel cracks in display panels of the same type based on the reading range, and output the detection result.

[0066] In the detection method of Embodiment 1, by pre-designing multiple levels in the passive component unit to form different reading ranges corresponding to different specifications of the display panel, the applicable range of the detection circuit is increased. And by detecting the process variation of the passive component unit to compensate the passive component unit, the problem that the actual value of the electronic component in the passive component unit does not match the predetermined value due to the process variation in integrated circuit manufacturing is solved, and the accuracy of the detection circuit for detecting panel cracking is improved. Among them, the passive component unit has multiple electronic components, and these electronic components can be any one of resistors, capacitors or inductors. In Embodiment 1, the electronic component is taken as a resistor for illustration. Then the predetermined value of the electronic component is the set resistance value when the resistor leaves the factory, and the actual value of the electronic component is the actual resistance value when actually measured.

[0067] Specifically, the same type of display panel means that all display panels in this type have the same specifications, and the way of arranging the conductive metal wires on them is the same. For example, all the conductive metal wires are arranged according to Figure 4Arranged in the left - hand manner. Generally speaking, on the detection production line, the display panel to be measured in the same batch is of the same type of display panel. Since among the display panels of the same type in the batch to be measured, it is not known which display panel has a crack, nor is it known whether each of the selected display panels for pre - measurement has a crack. Therefore, in order to more accurately detect the display panel with a crack and find out the reading range suitable for panel splitting detection of this same type of display panel. Thus, when performing S100 for pre - measurement, it is necessary to perform pre - measurement on one or several display panels. By calculating the pre - measurement values of the conductive metal wires on multiple display panels, the electrical parameters corresponding to the same type of display panel are obtained. The obtained electrical parameter is the average value of multiple pre - measurement values. In this way, even in the most extreme case where all the selected display panels have cracks, the numerical variation caused by the cracks in the display panels can be eliminated through the average value, and the electrical parameter most in line with this type of display panel can be obtained. Among them, the electrical parameter includes voltage or current. When performing S200, the panel splitting detection of the display panel is realized by using a passive component unit. In this Embodiment 1, the passive component unit is pre - designed with multiple levels, which not only expands the reading range but also can adjust the reading range according to the different display panel specifications. Among them, the values of the multiple levels pre - designed in the passive component unit can be resistance values, which are {5, 20, 40, 80, 160, 320, 640, 1028} kilo - ohms respectively. Since the resistance values of the electronic components in the passive component unit are known, the number of electronic components forming each level is also known. Then when selecting the reading range, either the corresponding number of electronic components can be selected in the passive component unit to form the corresponding reading range, or different numbers of electronic components can be combined in advance in the passive component unit according to each level to form different groups, and the corresponding group can be activated according to different reading ranges during use. And because process variation will inevitably occur during the manufacturing process of the passive component unit, resulting in the resistance value of the electronic component being larger or smaller than the predetermined value. When using these electronic components, the user does not know whether the resistance value of the electronic component has become larger or smaller. Therefore, before the panel splitting detection, it is necessary to perform S300 to detect the resistance value of the electronic components in the passive component unit and compensate for the part where the resistance value becomes larger or smaller, so as to maintain the accuracy of the reading range. However, when performing panel splitting detection on a type of display panel, only the electronic components corresponding to its corresponding reading range are often used. Therefore, it is only necessary to detect the process variation situation of the electronic components corresponding to the reading range, which not only saves detection resources but also increases the detection efficiency.The compensation range for compensating the passive component unit through process variation detection is ±10% of the reading range. Finally, a compensated electronic component usage group is obtained, and the sum of the resistance values of all the electronic components it contains is adapted to the corresponding reading range. Finally, S400 is executed to compare and calculate the electrical parameters (voltage / current) measured in the display panel with the determined reading range (resistance value). The resistance value represented by the reading range can be converted into the corresponding physical quantity (voltage / current), and then by judging whether the electrical parameters (voltage / current) are within the reading range, the detection result of whether there is a crack in the display panel is obtained, and finally this detection result is output for the user's reference.

[0068] In the detection method of Embodiment 1, step S200 is used to implement the PCD reading range. Refer to Figure 6 , and S200 specifically includes:

[0069] S201: Predesign multiple levels in the passive component unit, and each level is composed of the predetermined values of different numbers of electronic components in the passive component unit;

[0070] S202: Compare the value of the electrical parameter with the values of the multiple levels, and divide the multiple levels into a first part larger than the value of the electrical parameter and a second part smaller than the value of the electrical parameter;

[0071] S203: In the first part, select the level with the smallest value as the upper limit of the reading range for panel crack detection, and in the second part, select the level with the largest value as the lower limit of the reading range for panel crack detection, so as to obtain the reading range.

[0072] Specifically, since the size of the display panel to be measured and the material specifications of the conductive metal wires determine the magnitude of the electrical parameters (such as resistance values), the detection method of Embodiment 1 of the present invention sets a larger reading range. Then, according to the requirements of the display panel to be measured, an appropriate reading range is adjusted and selected through a control mechanism, so that the panel cracking detection can be applied to display panels of more sizes and conductive metal wires of more material specifications. Among them, the larger reading range is realized by pre-designing multiple levels, and these levels are realized by selecting different numbers of electronic components in the passive component unit. For example, the electronic components in the passive component unit are resistors, and each electronic component has a different resistance value. For example, the resistance value of each electronic component is 1 kiloohm. The multiple levels pre-designed are respectively {5, 20, 40, 80, 160, 320, 640, 1028} kiloohm. Selecting 5 electronic components as a group forms a level of 5 kiloohm, selecting 20 electronic components as a group forms a level of 20 kiloohm, and so on. The progression relationship between each level is generally a linear curve. An appropriate reading range is selected according to the measured electrical parameters among the reading ranges composed of these levels. Suppose the resistance value corresponding to the electrical parameters measured on a certain type of display panel to be measured is 250 kiloohm. Comparing the electrical parameters with multiple levels, it can be known that the first part with a value larger than 250 kiloohm is {320, 640, 1028} kiloohm, and the second part with a value smaller than 250 kiloohm is {5, 20, 40, 80, 160} kiloohm. Select the maximum value of 160 kiloohm in the first part as the lower limit of the reading range, and select the minimum value of 320 kiloohm in the second part as the upper limit of the reading range to form a reading range of 160 - 320 kiloohm for the panel cracking detection of this type of display panel. By using the above method, the detection range of the panel cracking detection can be increased to about 5 - 1000 kiloohm.

[0073] See Figure 7 , in the detection method of Embodiment 1 of the present invention, S300 specifically includes:

[0074] S301: Select a group of electronic components to be measured in the passive component unit according to the reading range and the predetermined value of a single electronic component;

[0075] S302: Detect the actual value of a single electronic component in the group of electronic components to be measured;

[0076] S303: Calculate the difference between the predetermined value and the actual value of a single electronic component, and combine the number of electronic components in the group of electronic components to be measured to obtain a compensation range corresponding to the reading range;

[0077] S304: Select a group of electronic components for compensation that need to be added to or removed from the group of electronic components to be measured in the passive component unit according to the compensation range;

[0078] S305: Determine an electronic component usage group for panel chip separation detection based on the electronic component group to be measured and the electronic component compensation group.

[0079] Specifically, when performing panel chip separation detection on a display panel, passive component units' electronic components (such as resistors, capacitors, inductors) and MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) components that control these electronic components are used. In integrated circuit applications, there are often variation factors in the integrated circuit manufacturing process, such as process variations, which can affect the selection of the reading range for passive component units. There are numerical errors (such as ±10%) between design and implementation due to passive component units. Therefore, in the detection method of this Embodiment 1, by reserving an electronic component compensation group in the passive component unit, for example, according to the reading range, 10% - 20% of the number of electronic components are reserved as the electronic component compensation group to be added to or removed from the electronic component group to be measured. Through the control mechanism, the compensation range of the reading range is elastically adjusted to improve the reading accuracy. For example, for multiple pre-designed levels {5, 20, 40, 80, 160, 320, 640, 1028} kΩ, the compensation range of the electronic component compensation group is designed as ±5%, ±10% or ±20% as a reference value and designed in the passive component unit. Then, according to the detection results of the process variation of the electronic component group to be measured, the selection of the compensation range is realized. For example, if the measured resistance value corresponding to the electrical parameter is 250 kΩ, and the selected reading range is 160 - 320 kΩ, that is, 320 electronic components are selected in the passive component unit. However, after the process variation is detected, the actual value of a single electronic component becomes 0.8 kΩ, with a difference of 0.2 kΩ compared to the predetermined value of 1 kΩ. Then the compensation range is 64 kΩ. Then, it is necessary to make up for this 64 kΩ compensation range through the electronic component compensation group, that is, add 64 additional electronic components to the electronic component group to be measured to compensate for the reading range. Even if the actual values of the 64 electronic components in the electronic component compensation group are also 0.8 kΩ, the reading range will lose 12.8 kΩ. Compared with the original difference of up to 20%, the accuracy has been greatly improved. In summary, by adopting the detection method of this Embodiment 1, the detection accuracy of panel chip separation detection can be greatly improved, thereby improving the product yield.

[0080] Embodiment 2

[0081] Embodiment 2 of the present invention discloses a detection system for a detection circuit for detecting the cleavage of a display panel, which is used to execute the compensation method disclosed in Embodiment 1 of the present application. By expanding the selection of the reading range of passive component units and compensating for the problem of poor accuracy of passive component units caused by process variations, the accuracy of panel cleavage detection and the applicable range of display panel specifications are improved.

[0082] See Figure 8 , the detection system 10 of this Embodiment 2 includes a pre-measurement module 11, a reading range module 12, a compensation range module 13, and a detection module 14 that are interconnected. Among them, the pre-measurement module 11 is used to pre-measure the conductive metal lines arranged on at least one display panel of the same type of display panel to obtain the electrical parameters corresponding to the same type of display panel; the reading range module 12 is used to select, according to the electrical parameters, a reading range suitable for detecting the cleavage of the same type of display panel from multiple levels pre-designed in the passive component unit; the compensation range module 13 is used to determine the compensation range for compensating the passive component unit according to the reading range through process variation detection, so as to determine the group of electronic components used in the passive component unit; the detection module 14 is used to detect the cleavage of the same type of display panel with the reading range as the reference by the group of electronic components used in the passive component unit and output the detection result. The pre-measurement module 11 transmits the electrical parameters to the reading range module 12, the reading range module 12 transmits the selected reading range according to the electrical parameters to the compensation range module 13, the compensation range module 13 compensates the passive component unit according to the reading parameters and selects the group of electronic components used, and the detection module 14 detects the cleavage of the display panel to be tested according to the selected group of electronic components used.

[0083] When the detection system 10 of this Embodiment 2 executes the detection method disclosed in Embodiment 1 of the present application, by pre-designing multiple levels in the passive component unit to form different reading ranges corresponding to different display panel specifications, the applicable range of the detection circuit is increased, and the passive component unit is compensated by detecting the process variation of the passive component unit, so as to solve the problem that the actual value of the electronic components in the passive component unit does not match the predetermined value caused by the process variation of integrated circuit manufacturing, and improve the accuracy of the detection circuit for detecting panel cleavage. Among them, the passive component unit has multiple electronic components, and these electronic components can be any one of resistors, capacitors or inductors.

[0084] Specifically, the same type of display panel means that all display panels of this type have the same specifications, and the way of arranging conductive metal lines on them is the same. For example, all conductive metal lines are arranged according to Figure 4Arranged in the left - hand manner. Generally speaking, on the detection production line, the display panels to be tested in the same batch are all of the same type of display panel. Since among the display panels of the same type in the batch to be tested, it is not known which display panel has a crack, nor is it known whether each of the selected display panels for pre - measurement has a crack. Therefore, in order to more accurately detect the display panel with a crack and find out the reading range suitable for panel cleavage detection of this same type of display panel. Thus, when performing pre - measurement through the pre - measurement module 11, it is necessary to perform pre - measurement on one or several display panels. By calculating the pre - measurement values of the conductive metal wires on multiple display panels, the electrical parameters corresponding to the same type of display panel are obtained. The obtained electrical parameter is the average value of multiple pre - measurement values. In this way, even in the most extreme case where all the selected display panels have cracks, the numerical variation caused by the cracks in the display panels can be eliminated through the average value, and the electrical parameter most in line with this type of display panel can be obtained. Among them, the electrical parameter includes voltage or current. The reading range module 12 is used to select the reading range corresponding to the electrical parameter, and the panel cleavage detection of the display panel is realized by using the passive component unit. In this Embodiment 2, the passive component unit is pre - designed with multiple levels, which not only expands the reading range but also can adjust the reading range according to different display panel specifications. Among them, the values of the multiple levels pre - designed in the passive component unit can be resistance values, which are {5, 20, 40, 80, 160, 320, 640, 1028} kilo - ohms respectively. Since the resistance values of the electronic components in the passive component unit are known, the number of electronic components forming each level is also known. Then when selecting the reading range, either the corresponding number of electronic components can be selected in the passive component unit to form the corresponding reading range, or different numbers of electronic components can be combined in advance in the passive component unit according to each level to form different groups, and the corresponding group can be activated according to different reading ranges during use. And because process variations will inevitably occur during the manufacturing process of the passive component unit, resulting in the resistance values of the electronic components being larger or smaller than the predetermined values, when using these electronic components, the user does not know whether the resistance value of the electronic component has become larger or smaller. Therefore, before the panel cleavage detection, it is necessary to use the compensation range module 13 to detect the resistance values of the electronic components in the passive component unit and compensate for the part where the resistance value has become larger or smaller, so as to maintain the accuracy of the reading range. However, when performing panel cleavage detection on a type of display panel, usually only those electronic components corresponding to its corresponding reading range are used. Therefore, it is only necessary to detect the process variation situation of the electronic components corresponding to the reading range, which not only saves detection resources but also increases detection efficiency.The compensation range for compensating the passive component unit through process variation detection is ±10% of the reading range. Finally, a compensated electronic component usage group is obtained, and the sum of the resistance values of all the electronic components it contains is adapted to the corresponding reading range. Finally, the detection module 14 is used to compare and calculate the electrical parameters (voltage / current) measured in the display panel with the determined reading range (resistance value). The resistance value represented by the reading range can be converted into the corresponding physical quantity (voltage / current), and then by determining whether the electrical parameter (voltage / current) is within the reading range, the detection result of whether there is a crack in the display panel is obtained, and finally this detection result is output for the user's reference.

[0085] Embodiment 3

[0086] Embodiment 3 of the present invention discloses a detection circuit for detecting cracks in a display panel. The compensation system disclosed in Embodiment 2 of the present application is used. By expanding the selection of the reading range of the passive component unit and compensating for the problem of poor accuracy of the passive component unit caused by process variation, the accuracy of panel crack detection and the applicable range of display panel specifications are improved.

[0087] See Figure 9 , the detection circuit 20 includes a detection unit 21, a passive component unit 22, and a control selection unit 23. The passive component unit 22 is connected to the detection unit 21, and the control selection unit 23 is connected to the passive component unit 22; a detection system 10 for detecting cracks in the display panel disclosed in Embodiment 2 of the present application is provided in the detection unit 21; according to the electrical parameters of the display panel obtained by detection, the detection system 10 determines the reading range of the passive component unit 22 through the control selection unit 23, and determines the electronic component usage group selected from the passive component unit 22 according to the compensation range detected according to the process variation situation through the control selection unit 23, and then performs panel crack detection on the same type of display panel based on the reading range, and finally outputs the detection result.

[0088] Specifically, for the detection circuit 20 disclosed in Embodiment 3 of the present invention, by providing the detection system 10 disclosed in Embodiment 2 of the present invention in the detection unit 21, the control selection unit 23 connected to the passive component unit 22 is controlled. According to the electrical parameters measured by the detection system 10, a part of the electronic components corresponding to the reading range corresponding to the electrical parameters is selected and activated in the passive component unit 22 as the electronic component usage group, and the voltage / current (i.e., the electrical parameter) of the conductive metal wire arranged on the display panel connected to the detection circuit 20 is detected to perform panel crack detection.

[0089] See Figure 10 and Figure 11, a plurality of electronic components, a selection switch, a correction increase switch, and a correction decrease switch connected to the electronic components are provided in the passive component unit 22, and a reading range encoder 24 and a compensation range encoder 25 are provided in the control selection unit 23; N electronic components connected in parallel with a single selection switch form a group of electronic components to be measured; in the group of electronic components to be measured, M of the electronic components are connected in parallel with the correction decrease switch, and outside the group of electronic components to be measured, M adjacent electronic components are connected in parallel with the correction increase switch to form a group of electronic components for compensation; wherein, different reading ranges correspond to different N, and the range of M / N is between 10% and 20%; the reading range encoder 24 finds the reading range corresponding to the electrical parameter according to the electrical parameter obtained by the detection system 10, selects the corresponding N for the reading range, and controls the corresponding selection switch to activate the corresponding group of electronic components to be measured; the compensation range encoder 25 selects to control the correction decrease switch to remove M electronic components from the group of electronic components to be measured, or selects to control the correction increase switch to add M electronic components to the group of electronic components to be measured to form a group of electronic components for use in panel crack detection.

[0090] Specifically, the passive component unit 22 is pre-designed with a plurality of levels to form different reading ranges corresponding to different specifications of the display panel, increasing the applicable range of the detection circuit 20, and compensating the passive component unit 22 by detecting the process variation of the passive component unit 22, solving the problem that the actual value of the electronic components in the passive component unit 22 does not match the predetermined value due to the process variation in the integrated circuit manufacturing, and improving the accuracy of the detection circuit 20 for detecting panel cracks. Among them, the passive component unit 22 has a plurality of electronic components, and these electronic components can be any one of resistors, capacitors or inductors. In this embodiment 3, the electronic components are resistors for illustration. Figure 11Among them, each electronic component is represented by R, the selection switch is represented by SSW, the correction increase switch is represented by C+SW, the correction reduction switch is represented by C-SW, and multiple groups of similar electronic component test groups and electronic component compensation groups in the passive component unit 22 are uniformly represented by R-Array, and their specific functions are the same as those of the shown electronic component test groups and electronic component compensation groups. Thus, the values of these levels can be resistance values. For example, if the resistance value of each electronic component is 1 kΩ, then these levels can be {5, 20, 40, 80, 160, 320, 640, 1028} kΩ respectively. Select 5 electronic components as a group to form a 5 kΩ level, select 20 electronic components as a group to form a 20 kΩ level, and so on. The progressive relationship between each level is generally a linear curve. These levels correspond to the electronic component test groups. A selection switch is connected in parallel at both ends of each electronic component test group. For example, the selection switch connected in parallel at both ends of the electronic component test group corresponding to the 5 kΩ level is connected in parallel with a total of 5 electronic components (N = 5), and the selection switch connected in parallel at both ends of the electronic component test group corresponding to the 20 kΩ level is connected in parallel with a total of 20 electronic components (N = 20). In each reading range formed by these levels, the reading range encoder 24 of the detection system 10 controls to select an appropriate reading range according to the measured electrical parameters. Suppose the resistance value corresponding to the electrical parameters measured on a display panel of a certain type to be tested is 250 kΩ. By comparing the electrical parameters with multiple levels, it can be obtained that the electrical parameters of 250 kΩ correspond to the reading range of 160 - 320 kΩ. At this time, the reading range encoder 24 of the control selection unit 23 selects and activates the selection switch connected in parallel at both ends of 250 electronic components, and the 250 electronic components are used to perform panel cracking detection on the display panel of the type corresponding to the electrical parameters of 250 kΩ.

[0091] To address the issue that the selected reading range affects the detection accuracy due to process variations during the manufacturing process of the passive component unit 22, an electronic component compensation group is additionally designed in the passive component unit 22. Its compensation range is designed to be ±5%, ±10%, or ±20% to compensate for the reading range, thereby improving the accuracy of panel chip detection. For example, if the measured resistance value corresponding to the electrical parameter is 250 kΩ and the selected reading range is 160 - 320 kΩ, that is, the reading range module 12 in the detection system 10 controls the reading range encoder 24 to select 320 electronic components (N = 320) in the passive component unit 22. However, through the detection of process variation conditions, the actual value of a single electronic component becomes 0.8 kΩ, with a difference of 0.2 kΩ compared to the predetermined value of 1 kΩ. Then the compensation range is 64 kΩ. In this case, it is necessary to control the compensation range encoder 25 by the compensation range module 13 of the detection system 10 to select an appropriate electronic component compensation group to make up for this 64 kΩ compensation range. That is, 64 additional electronic components are added to the group of electronic components to be measured to compensate for the reading range. Even if the actual values of the 64 electronic components (M = 64) in the electronic component compensation group are also 0.8 kΩ, the reading range will be lost by 12.8 kΩ. At this time, M / N = 64 / 320 = 20%. After the above compensation of the reading range by the electronic component compensation group, compared with the original difference of up to 20%, the accuracy of the reading range for panel chip detection has been greatly improved, and at the same time, the yield of the product has also been increased.

[0092] Example 4

[0093] Example 4 of the present invention discloses a computer-readable storage medium. A computer program is stored in the computer-readable storage medium. When it runs on a computer, it causes the computer to execute the detection method of the detection circuit for display panel chip detection as disclosed in Example 1.

[0094] Example 5

[0095] Example 5 of the present invention discloses a computer program product. The computer program product includes a computer program. When it runs on a computer, it causes the computer to execute the detection method of the detection circuit for display panel chip detection as disclosed in Example 1.

[0096] The detection circuit, its detection method, and system for display panel chip detection disclosed by the present invention increase the reading range of display panel chip detection. The detection circuit can be applicable to more specifications of display panels, and can improve the accuracy of display panel chip detection and increase the production process yield.

[0097] It should be understood that the above description of the specific embodiments of the present invention is only for explaining the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the above specific embodiments. Any changes or modifications made within the scope of the claims of the present invention should be covered by the protection scope of the present invention.

Claims

1. A detection method for a detection circuit used for detecting the cleavage of a display panel, characterized in that The detection method includes: For display panels of the same type, pre-measure the conductive metal wires arranged on at least one of the display panels to obtain the electrical parameters corresponding to the display panels of the same type; According to the electrical parameters, select a reading range suitable for panel cracking detection of the display panels of the same type from multiple levels pre-designed in the passive component unit, where the passive component unit includes resistors, capacitors, and inductors; According to the reading range, determine the compensation range for compensating the passive component unit through process variation detection to determine the group of electronic components selected in the passive component unit; Use the group of electronic components selected in the passive component unit to perform panel cracking detection on the display panels of the same type based on the reading range and output the detection result.

2. The detection method of the detection circuit for display panel chip separation detection according to claim 1, wherein In the step of selecting a reading range suitable for panel cracking detection of the display panels of the same type from multiple levels pre-designed in the passive component unit according to the electrical parameters, it specifically includes: Pre-design multiple levels in the passive component unit, and each level is composed of predetermined values of different numbers of electronic components in the passive component unit; Compare the value of the electrical parameter with the values of the multiple levels, and divide the multiple levels into a first part larger than the value of the electrical parameter and a second part smaller than the value of the electrical parameter; In the first part, select the level with the smallest value as the upper limit of the reading range for panel cracking detection, and in the second part, select the level with the largest value as the lower limit of the reading range for panel cracking detection, so as to obtain the reading range.

3. The detection method of the detection circuit for detecting the splitting of a display panel according to claim 1, characterized in that, In the step of determining the compensation range for compensating the passive component unit through process variation detection according to the reading range to determine the group of electronic components selected in the passive component unit, it specifically includes: Select a group of electronic components to be measured in the passive component unit according to the reading range and the predetermined value of a single electronic component; Detect the actual value of a single electronic component in the group of electronic components to be measured; Calculate the difference between the predetermined value and the actual value of a single electronic component, and combine the number of electronic components in the group of electronic components to be measured to obtain the compensation range corresponding to the reading range; According to the compensation range, select a group of electronic components for compensation that need to be added to or removed from the group of electronic components to be measured in the passive component unit; Based on the group of electronic components to be measured and the group of electronic components for compensation, determine the group of electronic components used for panel cracking detection.

4. The detection method of the detection circuit for display panel chip separation detection according to claim 1, characterized in that When performing the pre-measurement, calculate the pre-measurement values of the conductive metal wires on multiple display panels to obtain the electrical parameters corresponding to the display panels of the same type.

5. The detection method of the detection circuit for display panel chip separation detection according to claim 1, characterized in that, The values of the pre-designed multiple levels are respectively {5, 20, 40, 80, 160, 320, 640, 1028} kΩ.

6. A detection system for a detection circuit used for detecting the splitting of a display panel, characterized in that, The detection system includes a pre-measurement module, a reading range module, a compensation range module, and a detection module that are interconnected; The pre-measurement module is used to pre-measure the conductive metal wires arranged on at least one display panel of the same type of display panel, and obtain the electrical parameters corresponding to the same type of display panel; The reading range module is used to select a reading range suitable for panel cracking detection of the same type of display panel from a plurality of levels pre-designed in the passive component unit according to the electrical parameters. The passive component unit includes resistors, capacitors and inductors; The compensation range module is used to determine the compensation range for compensating the passive component unit through process variation detection according to the reading range, so as to determine the electronic component usage group selected in the passive component unit; The detection module is used to perform panel cracking detection on the same type of display panel based on the reading range by using the electronic component usage group selected in the passive component unit, and output the detection result.

7. A detection circuit for detecting the chip separation of a display panel, characterized in that, The detection circuit includes a detection unit, a passive component unit and a control selection unit. The passive component unit is connected to the detection unit, and the control selection unit is connected to the passive component unit; The detection system for detecting the cracking of the display panel as described in claim 6 is provided in the detection unit; The detection system determines the reading range of the passive component unit through the control selection unit according to the electrical parameters of the detected display panel, and determines the electronic component usage group selected in the passive component unit according to the compensation range obtained by process variation detection. Then, it performs panel cracking detection on the same type of display panel based on the reading range, and finally outputs the detection result.

8. The detection circuit for detecting the cleavage of a display panel according to claim 7, characterized in that, A plurality of electronic components, a selection switch, a calibration increase switch and a calibration reduction switch connected to the electronic components are provided in the passive component unit. A reading range encoder and a compensation range encoder are provided in the control selection unit; N electronic components connected in parallel with a single selection switch form a group of electronic components to be measured; In the group of electronic components to be measured, M of the electronic components are connected in parallel with the calibration reduction switch. Outside the group of electronic components to be measured, M of the adjacent electronic components are connected in parallel with the calibration increase switch to form a group of electronic components for compensation; Among them, different reading ranges correspond to different N, and the range of M / N is between 10% and 20%; The reading range encoder finds the reading range corresponding to the electrical parameters according to the electrical parameters obtained by the detection system, selects the corresponding N for the reading range, and controls the corresponding selection switch to activate the corresponding group of electronic components to be measured; The compensation range encoder selects and controls the calibration reduction switch to remove M electronic components from the group of electronic components to be measured, or selects and controls the calibration increase switch to add M electronic components to the group of electronic components to be measured to form a group of electronic components for panel cracking detection.

9. A computer-readable storage medium, characterized in that, A computer program is stored in the computer-readable storage medium, and when it runs on a computer, it causes the computer to execute the detection method of the detection circuit for detecting the fracture of a display panel according to any one of claims 1 to 5.

10. A computer program product, characterized in that, The computer program product includes a computer program, and when it runs on a computer, it causes the computer to execute the detection method of the detection circuit for detecting the fracture of a display panel according to any one of claims 1 to 5.

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