Threshold voltage correction circuit, threshold voltage correction method, threshold voltage correction device and display equipment

Abstract

The invention relates to a threshold voltage correcting circuit, a threshold voltage correcting method, a threshold voltage correcting device and display equipment. The threshold voltage correcting circuit comprises a comparison unit, a simulation unit and a control unit. The contrast unit comprises a first transistor; the simulation unit comprises a second transistor, and the second transistor is used for simulating the running state of a pull-down transistor in the gate drive circuit; the control unit is used for determining the threshold voltage difference between the first transistor and the second transistor according to the current change between the source and drain electrodes of the first transistor and the second transistor; and if the threshold voltage difference is greater than the preset voltage, controlling a gate driving unit signal to insert a black picture frame in a display process, and applying a target voltage to a second transistor and a pull-down transistor in the gate driving circuit until the threshold voltage difference is detected to be less than or equal to the preset voltage. The problem that the I-V curve of the TFT moves rightwards to cause cross grains in a picture is solved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a threshold voltage correction circuit and correction method, device and display device thereof. Background Art

[0002] With the continuous maturity of liquid crystal display technology, LCDs have been widely used in various fields. Currently, the gate driver circuit in LCDs is generally fabricated on the array substrate, known as a GDL (Gate Driver Less) circuit. Under high temperature and high humidity conditions, the thin film transistors (TFTs) in the pull-down module of the GDL circuit are subjected to a forward bias state for a long time, causing the IV curve of the TFT in the pull-down module to shift rightward. This rightward shift can lead to deviations in the switching timing of the gate driver circuit, resulting in display anomalies such as horizontal streaks.

[0003] Currently, no effective solution has been proposed to the problem of horizontal stripes appearing on the screen due to the rightward shift of the IV curve of the TFT. Summary of the Invention

[0004] The present application provides a threshold voltage correction circuit and correction method, device and display device thereof to solve the above-mentioned technical problem of "horizontal stripes appearing on the screen due to the right shift of the IV curve of the TFT".

[0005] According to one aspect of an embodiment of the present application, the present application provides a threshold voltage correction circuit, including a control unit, an analog unit and a control unit; the control unit includes a first transistor, and the first transistor is arranged in a non-display area of ​​the display panel; the analog unit includes a second transistor, and the second transistor is used to simulate the operating state of the pull-down transistor in the gate drive circuit, and the second transistor is arranged in the non-display area of ​​the display panel; the control unit is respectively connected to the control unit, the analog unit and the gate drive circuit, and is used to monitor the current changes between the source and drain of the first transistor and the second transistor respectively, and determine the threshold voltage difference between the first transistor and the second transistor based on the current changes; if the threshold voltage difference is greater than a preset voltage, the gate drive unit signal is controlled to insert a black picture frame during the display process, and a target voltage is applied to the second transistor and the pull-down transistor in the gate drive circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0006] Optionally, the gate of the first transistor is connected to the control unit, the first end of the first transistor is connected to the control unit through a first detection point, the second end of the first transistor is connected to the first signal line, the control unit applies alternating high and low voltage signals to the gate of the first transistor, and the first signal line is used to apply a low voltage signal to the second end of the first transistor.

[0007] Optionally, the gate of the second transistor is connected to the control unit, the first end of the second transistor is connected to the control unit via a second detection point, and the gate high voltage signal of the second transistor is provided by a second signal line.

[0008] Optionally, the analog unit also includes a third transistor, the first end of the third transistor is connected to the second end of the second transistor, the second end of the third transistor is connected to the control unit, and the third transistor is used to receive the target voltage applied by the control unit and transmit the target voltage to the second transistor.

[0009] Optionally, the analog unit also includes a fourth transistor, the gate of the fourth transistor is connected to the control unit, the first end of the fourth transistor is connected to the second end of the second transistor, and the second end of the fourth transistor is connected to the first signal line. When the control unit does not output the target voltage, the fourth transistor is used to operate when it receives a high and low voltage alternating signal applied by the control unit.

[0010] According to another aspect of the embodiments of the present application, the present application also provides a threshold voltage correction method, which is applied to the above-mentioned circuit, and the correction method includes: setting a first transistor and a second transistor, wherein the second transistor is used to simulate the operating state of the pull-down transistor in the gate drive circuit; monitoring the current changes between the source and drain of the first transistor and the second transistor respectively through the control unit, and determining the threshold voltage difference between the first transistor and the second transistor based on the current change; if the threshold voltage difference is greater than the preset voltage, controlling the gate drive unit signal to insert a black picture frame during the display process, and applying the target voltage to the second transistor and the pull-down transistor in the gate drive circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0011] Optionally, providing the first transistor and the second transistor includes: transmitting a high-low voltage alternating signal to the gate of the first transistor, and transmitting a high-voltage signal to the gate of the second transistor.

[0012] Optionally, a target voltage is applied to the second transistor and the pull-down transistor in the gate drive circuit until a threshold voltage difference is detected to be less than or equal to a preset voltage, including: obtaining the gate voltage of the pull-down transistor and determining a target voltage based on the gate voltage, wherein the target voltage is greater than the gate voltage; applying a target voltage to the source of the second transistor and applying a target voltage to the pull-down transistor in the gate drive circuit; monitoring changes in the threshold voltage difference and stopping applying the target voltage to the second transistor and the pull-down transistor when it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0013] According to another aspect of an embodiment of the present application, the present application provides a threshold voltage correction device, including: a first processing module, used to set a first transistor and a second transistor, wherein the second transistor is used to simulate the operating state of the pull-down transistor in the gate drive circuit; a monitoring module, used to monitor the current changes between the source and drain of the first transistor and the second transistor respectively through a control unit, and determine the threshold voltage difference between the first transistor and the second transistor based on the current change; a second processing module, used to control the gate drive unit signal to insert a black picture frame during the display process if the threshold voltage difference is greater than a preset voltage, and apply a target voltage to the second transistor and the pull-down transistor in the gate drive circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0014] According to another aspect of the embodiments of the present application, the present application also provides a display device, including the above-mentioned threshold voltage correction circuit.

[0015] The above technical solution provided by the embodiment of the present application has the following advantages compared with the related art:

[0016] The present application provides a threshold voltage correction circuit, including a control unit, an analog unit and a control unit; the control unit includes a first transistor, which is arranged in a non-display area of ​​a display panel; the analog unit includes a second transistor, which is used to simulate the operating state of a pull-down transistor in a gate drive circuit, and the second transistor is arranged in the non-display area of ​​the display panel; the control unit is connected to the control unit, the analog unit and the gate drive circuit, respectively, and is used to monitor the current changes between the source and drain of the first transistor and the second transistor, respectively, and determine the threshold voltage difference between the first transistor and the second transistor based on the current changes; if the threshold voltage difference is greater than a preset voltage, the gate drive unit signal is controlled to insert a black frame during the display process, and a target voltage is applied to the second transistor and the pull-down transistor in the gate drive circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage. By setting a second transistor to simulate the operating state of the pull-down transistor in the gate drive circuit, and then monitoring the threshold voltage difference between the normally operating first transistor and the second transistor, the right shift degree of the IV curve of the pull-down transistor is determined according to the difference between the threshold voltage difference and the preset voltage. If the difference is too large, it means that the right shift degree of the IV curve is too large. At this time, the target voltage is applied to the pull-down transistor to shift the IV curve to the left, solving the problem of horizontal stripes on the screen caused by the right shift of the IV curve of the TFT. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of an optional threshold voltage correction circuit provided according to an embodiment of the present application;

[0020] Figure 2 A schematic diagram of an optional display panel provided according to an embodiment of the present application;

[0021] Figure 3 A schematic diagram of applying an optional level signal according to an embodiment of the present application;

[0022] Figure 4 A schematic diagram of another optional threshold voltage correction circuit provided according to an embodiment of the present application;

[0023] Figure 5 This is a flowchart of an optional method for correcting a threshold voltage according to an embodiment of the present application;

[0024] Figure 6 This is a block diagram of an optional device for correcting a threshold voltage according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of this application and have no specific meaning. Therefore, "module" and "component" can be used interchangeably.

[0027] With the continuous maturity of liquid crystal display technology, LCDs have been widely used in various fields. Currently, the gate driver circuit in LCDs is generally fabricated on the array substrate, known as a GDL (Gate Driver Less) circuit. Under high temperature and high humidity conditions, the thin film transistors (TFTs) in the pull-down module of the GDL circuit are subjected to a forward bias state for a long time, causing the IV curve of the TFT in the pull-down module to shift rightward. This rightward shift can lead to deviations in the switching timing of the gate driver circuit, resulting in display anomalies such as horizontal streaks.

[0028] In order to solve the problems mentioned in the background technology, according to one aspect of the embodiment of the present application, a threshold voltage correction circuit is provided, such as Figure 1 As shown, it includes: a control unit 102, a simulation unit 104 and a control unit 106;

[0029] The control unit 102 includes a first transistor, which is disposed in a non-display area of ​​the display panel;

[0030] The simulation unit 104 includes a second transistor, which is used to simulate the operating state of the pull-down transistor in the gate driving circuit, and the second transistor is arranged in the non-display area of ​​the display panel;

[0031] The control unit 106 is connected to the control unit 102, the simulation unit 104 and the gate drive circuit, respectively, and is used to monitor the current changes between the source and drain of the first transistor and the second transistor, and determine the threshold voltage difference between the first transistor and the second transistor based on the current changes; if the threshold voltage difference is greater than a preset voltage, the gate drive unit signal is controlled to insert a black frame during the display process, and a target voltage is applied to the second transistor and the pull-down transistor in the gate drive circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0032] Specifically, the control unit includes a first transistor used as a control, and the simulation unit includes a second transistor used to simulate the operating state of the pull-down transistor in the gate drive circuit. The control unit monitors the current changes between the source and drain of the first transistor and the second transistor respectively, and then determines the threshold voltage difference between the first transistor and the second transistor based on the current changes, thereby determining the degree of right shift of the IV curve of the pull-down transistor. If the degree of right shift is too large (that is, the threshold voltage difference is greater than the preset voltage), a black picture frame is inserted in the display area, and a target voltage is applied to the second transistor and the pull-down transistor in the gate drive circuit to adjust the impact of continuous high voltage on the pull-down transistor.

[0033] To avoid affecting the visual effect of the displayed image, both transistors are arranged in the non-display area of ​​the display panel. The non-display area refers to the part of the panel that is not used to actually display the image, and is usually used to place driving circuits and auxiliary components.

[0034] Applying a target voltage to the pull-down transistor in the gate drive circuit is to adjust the right shift degree of the characteristic curve of the pull-down transistor, and applying a target voltage to the second transistor is to ensure that the second transistor can synchronize the operating state of the pull-down transistor.

[0035] Specifically, the target voltage may be set according to the gate voltage of the pull-down transistor, and the target voltage may be greater than the gate voltage of the pull-down transistor.

[0036] Applying a target voltage to the pull-down transistor in the gate drive circuit can put the entire pull-down transistor in a reverse negative stress state, causing a left shift in the IV curve of the pull-down transistor, thereby offsetting the right shift effect caused by the forward bias stress.

[0037] Figure 2 A schematic diagram of the display panel provided for the present application is shown in the figure, in which an analog unit and a control unit are set in the non-display area of ​​the display panel. The control unit includes a transistor in a normal operating state, and the analog unit includes a transistor for simulating the operating state of the pull-down transistor in the gate drive circuit. The control unit is also set in the non-display area (not shown in the figure).

[0038] The present application sets a first transistor in a normally operating state as a control group, sets a second transistor to simulate the operating state of the pull-down transistor in the gate drive circuit, and then monitors the threshold voltage difference between the normally operating first transistor and the second transistor. The right shift degree of the IV curve of the pull-down transistor is determined according to the difference between the threshold voltage difference and the preset voltage. If the difference is too large, it means that the right shift degree of the IV curve is too large. At this time, a target voltage greater than the gate voltage of the pull-down transistor is applied to the pull-down transistor to shift the IV curve to the left, thereby adjusting the right shift degree of the IV curve to avoid horizontal stripes on the display screen due to excessive right shift.

[0039] As an optional embodiment, the gate of the first transistor is connected to the control unit, the first end of the first transistor is connected to the control unit through the first detection point, the second end of the first transistor is connected to the first signal line, the control unit applies alternating high and low voltage signals to the gate of the first transistor, and the first signal line is used to apply a low voltage signal to the second end of the first transistor.

[0040] The first end of the first transistor is connected to the control unit via a first detection point, and the control unit can monitor the current change between the source and drain of the first transistor according to the first detection point.

[0041] The first signal line applies a low voltage signal to the second end of the first transistor. This signal may be used to simulate the driving signal of the display panel during actual operation, helping the transistor to better adapt to the working conditions of the display panel.

[0042] As an optional embodiment, the gate of the second transistor is connected to the control unit, the first end of the second transistor is connected to the control unit via the second detection point, and the gate high voltage signal of the second transistor is provided by the second signal line.

[0043] A second signal line (ie, a VGH (Gate High Voltage) signal line) on the display panel applies a high voltage signal to the gate of the second transistor.

[0044] Figure 3 A schematic diagram of applying a level signal provided in this application is shown in the figure, where V1 is a level signal applied to the first transistor, and the signal level of V1 alternates between high and low levels; V2 is a level signal applied to the second transistor, and the signal level of V2 is a continuously high level (or a high level for at least 99% of the time).

[0045] As an optional embodiment, the analog unit also includes a third transistor, the first end of the third transistor is connected to the second end of the second transistor, the second end of the third transistor is connected to the control unit, and the third transistor is used to receive the target voltage applied by the control unit and transmit the target voltage to the second transistor.

[0046] The first end of the third transistor is an output end, and the second end is an input end.

[0047] The third transistor plays the role of outputting the target voltage applied by the control unit to the second transistor, and can synchronize the pressure signal received by the pull-down transistor to the second transistor.

[0048] As an optional embodiment, the analog unit also includes a fourth transistor, the gate of the fourth transistor is connected to the control unit, the first end of the fourth transistor is connected to the second end of the second transistor, and the second end of the fourth transistor is connected to the first signal line. When the control unit does not output the target voltage, the fourth transistor is used to operate when it receives a high and low voltage alternating signal applied by the control unit.

[0049] The second end of the fourth transistor is connected to the first signal line VGL (Gate Low Voltage) on the display panel. When the control unit outputs the target voltage, the gate signal line of the fourth transistor is switched to a low voltage signal, the signal input of the fourth transistor is cut off, and the second transistor only receives the target voltage from the control unit.

[0050] Figure 4This is a schematic diagram of another threshold voltage correction circuit provided by the present application. As shown in the figure, the control unit is connected to the control unit through IC test point 1 (i.e., the first detection point). The control unit includes T1 (i.e., the first transistor). The gate of T1 receives the V1 signal (alternating between high and low levels), the source of T1 receives the low-voltage signal VGL given by the panel, and the drain of T1 is connected to IC test point 1; the analog unit is connected to the control unit through IC test point 2 (i.e., the second detection point). The analog unit includes T2 (i.e., the second transistor), T3 (i.e., the third transistor), and T4 (i.e., the fourth transistor). The gate of T2 receives the V2 signal (continuous high level), the source of T2 is connected to T3 and T4 respectively, and the drain of T2 is connected to IC test point 2. The gate and source of T3 are both connected to the control unit to receive the V3 signal (target voltage) given by the control unit. The gate of T4 is used to receive the signal given by the control unit; the control unit is also connected to the pull-down transistor of the gate drive circuit to apply the target voltage to the pull-down transistor.

[0051] The present application provides a threshold voltage correction circuit, including a control unit, an analog unit and a control unit; the control unit includes a first transistor, which is arranged in a non-display area of ​​a display panel; the analog unit includes a second transistor, which is used to simulate the operating state of a pull-down transistor in a gate drive circuit, and the second transistor is arranged in the non-display area of ​​the display panel; the control unit is connected to the control unit, the analog unit and the gate drive circuit, respectively, and is used to monitor the current changes between the source and drain of the first transistor and the second transistor, respectively, and determine the threshold voltage difference between the first transistor and the second transistor based on the current changes; if the threshold voltage difference is greater than a preset voltage, the gate drive unit signal is controlled to insert a black frame during the display process, and a target voltage is applied to the second transistor and the pull-down transistor in the gate drive circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage. By setting a second transistor to simulate the operating state of the pull-down transistor in the gate drive circuit, and then monitoring the threshold voltage difference between the normally operating first transistor and the second transistor, the right shift degree of the IV curve of the pull-down transistor is determined according to the difference between the threshold voltage difference and the preset voltage. If the difference is too large, it means that the right shift degree of the IV curve is too large. At this time, the target voltage is applied to the pull-down transistor to shift the IV curve to the left, solving the problem of horizontal stripes on the screen caused by the right shift of the IV curve of the TFT.

[0052] According to another aspect of the embodiment of the present application, the present application also provides a threshold voltage correction method, which is applied to the above correction circuit, such as Figure 5 As shown, the correction method includes:

[0053] Step 501, setting a first transistor and a second transistor, wherein the second transistor is used to simulate the operating state of a pull-down transistor in a gate drive circuit;

[0054] Step 503 , monitoring the current changes between the source and drain of the first transistor and the second transistor respectively by the control unit, and determining the threshold voltage difference between the first transistor and the second transistor according to the current changes;

[0055] Step 505 , if the threshold voltage difference is greater than the preset voltage, control the gate driving unit signal to insert a black frame during the display process, and apply the target voltage to the second transistor and the pull-down transistor in the gate driving circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0056] The first transistor is a reference transistor in a normal operating state, which reflects the ideal working state of the gate drive circuit. The second transistor is a transistor used to simulate the working state of the pull-down transistor in the gate drive circuit.

[0057] Monitor the current change between the source and drain of the first transistor and the second transistor, calculate the threshold voltage difference between the first transistor and the second transistor, and thus determine whether the IV curve of the pull-down transistor in the gate drive circuit is shifted to the right.

[0058] As an optional embodiment, providing the first transistor and the second transistor includes: transmitting alternating high and low voltage signals to the gate of the first transistor, and transmitting a high voltage signal to the gate of the second transistor.

[0059] Specifically, the working conditions of an actual display panel are simulated by applying a high-low voltage alternating signal to its gate. This alternating signal means that its gate voltage switches between high and low voltages to simulate the on / off state of a TFT transistor.

[0060] Specifically, a high voltage signal is continuously applied to the gate of the second transistor to test the working state of the pull-down transistor.

[0061] By placing the two transistors in different operating states (one operating normally and the other simulating the function of a pull-down transistor), the current and voltage differences can be compared to identify abnormal conditions in the pull-down transistor.

[0062] As an optional embodiment, a target voltage is applied to the second transistor and the pull-down transistor in the gate drive circuit until a threshold voltage difference is detected to be less than or equal to a preset voltage, including: obtaining the gate voltage of the pull-down transistor and determining the target voltage based on the gate voltage, wherein the target voltage is greater than the gate voltage; applying the target voltage to the source of the second transistor and applying the target voltage to the pull-down transistor in the gate drive circuit; monitoring changes in the threshold voltage difference, and stopping applying the target voltage to the second transistor and the pull-down transistor when it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0063] Applying a target voltage to the pull-down transistor in the gate drive circuit is to adjust the right shift degree of the characteristic curve of the pull-down transistor, and applying a target voltage to the second transistor is to ensure that the second transistor can synchronize the operating state of the pull-down transistor.

[0064] Specifically, the target voltage may be set according to the gate voltage of the pull-down transistor, and the target voltage may be greater than the gate voltage of the pull-down transistor.

[0065] Applying a target voltage to the pull-down transistor in the gate drive circuit can put the entire pull-down transistor in a reverse negative stress state, causing a left shift in the IV curve of the pull-down transistor, thereby offsetting the right shift effect caused by the forward bias stress.

[0066] The present application provides a threshold voltage correction method for the above-mentioned circuit. The correction method includes: providing a first transistor and a second transistor, wherein the second transistor is used to simulate the operating state of a pull-down transistor in a gate drive circuit; monitoring the current changes between the source and drain of the first transistor and the second transistor respectively by a control unit, and determining the threshold voltage difference between the first transistor and the second transistor based on the current changes; if the threshold voltage difference is greater than a preset voltage, controlling the gate drive unit signal to insert a black frame during the display process, and applying a target voltage to the second transistor and the pull-down transistor in the gate drive circuit until the threshold voltage difference is detected to be less than or equal to the preset voltage. The second transistor is provided to simulate the operating state of the pull-down transistor in the gate drive circuit, and then the threshold voltage difference between the normally operating first transistor and the second transistor is monitored. The degree of rightward shift of the IV curve of the pull-down transistor is determined based on the difference between the threshold voltage difference and the preset voltage. If the difference is too large, indicating that the IV curve has shifted too much to the right, the target voltage is applied to the pull-down transistor to shift the IV curve to the left, thereby resolving the problem of horizontal stripes on the screen caused by the rightward shift of the TFT IV curve.

[0067] According to another aspect of the embodiment of the present application, the present application provides a threshold voltage correction device, such as Figure 6 Shown, including:

[0068] A first processing module 602 is configured to set a first transistor and a second transistor, wherein the second transistor is configured to simulate an operating state of a pull-down transistor in a gate drive circuit;

[0069] A monitoring module 604 is configured to monitor, through a control unit, current changes between the source and drain of the first transistor and the second transistor, respectively, and determine a threshold voltage difference between the first transistor and the second transistor based on the current changes;

[0070] The second processing module 606 is used to control the gate driving unit signal to insert a black frame during the display process if the threshold voltage difference is greater than the preset voltage, and apply the target voltage to the second transistor and the pull-down transistor in the gate driving circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0071] It should be noted that the first processing module 602 in this embodiment can be used to execute step 501 in the embodiment of the present application, the monitoring module 604 in this embodiment can be used to execute step 503 in the embodiment of the present application, and the second processing module 606 in this embodiment can be used to execute step 505 in the embodiment of the present application.

[0072] Optionally, the first processing module 602 is specifically configured to transmit a high-low voltage alternating signal to the gate of the first transistor, and transmit a high-voltage signal to the gate of the second transistor.

[0073] Optionally, the second processing module 606 is specifically used to obtain the gate voltage of the pull-down transistor and determine the target voltage based on the gate voltage, wherein the target voltage is greater than the gate voltage; apply the target voltage to the source of the second transistor, and apply the target voltage to the pull-down transistor in the gate drive circuit; monitor the change of the threshold voltage difference, and stop applying the target voltage to the second transistor and the pull-down transistor when it is detected that the threshold voltage difference is less than or equal to the preset voltage.

[0074] It should be noted here that the examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments.

[0075] According to another aspect of an embodiment of the present application, the present application provides a display device including the above-mentioned threshold voltage correction circuit.

[0076] According to another aspect of the embodiments of the present application, a computer-readable medium having non-volatile program code executable by a processor is provided.

[0077] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0078] When implementing the embodiments of the present application, reference may be made to the above embodiments, which have corresponding technical effects.

[0079] It is understood that the embodiments described herein may be implemented using hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit may be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or a combination thereof.

[0080] For software implementation, the technology described herein can be implemented by a unit that performs the functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

[0081] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0082] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0083] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0084] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0085] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0086] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application are essentially or partly contributed to the prior art or part of the technical solutions can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard drive, a ROM, a RAM, a magnetic disk, or an optical disk. It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without further constraints, an element defined by the phrase "comprises a..." does not preclude the existence of additional identical elements in the process, method, article or apparatus that includes the element.

[0087] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A threshold voltage correction circuit, characterized in that: including a control unit, a simulation unit and a control unit; The control unit includes a first transistor, which is arranged in a non-display area of ​​the display panel; The simulation unit includes a second transistor, the second transistor is used to simulate the operating state of the pull-down transistor in the gate driving circuit, and the second transistor is arranged in the non-display area of ​​the display panel; The control unit is connected to the control unit, the simulation unit and the gate drive circuit respectively, and is used to monitor the current changes between the source and drain of the first transistor and the second transistor respectively, and determine the threshold voltage difference between the first transistor and the second transistor according to the current changes; If the threshold voltage difference is greater than a preset voltage, the gate driving unit signal is controlled to insert a black frame during the display process, and a target voltage is applied to the second transistor and the pull-down transistor in the gate driving circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

2. The circuit according to claim 1, wherein: The gate of the first transistor is connected to the control unit, the first end of the first transistor is connected to the control unit through a first detection point, the second end of the first transistor is connected to a first signal line, the control unit applies a high and low voltage alternating signal to the gate of the first transistor, and the first signal line is used to apply a low voltage signal to the second end of the first transistor.

3. The circuit according to claim 1, wherein: The gate of the second transistor is connected to the control unit, the first end of the second transistor is connected to the control unit via a second detection point, and the gate high voltage signal of the second transistor is provided by a second signal line.

4. The circuit according to claim 3, characterized in that The analog unit also includes a third transistor, a first end of the third transistor is connected to the second end of the second transistor, and a second end of the third transistor is connected to the control unit. The third transistor is used to receive the target voltage applied by the control unit and transmit the target voltage to the second transistor.

5. The circuit according to claim 3, characterized in that The analog unit also includes a fourth transistor, the gate of the fourth transistor is connected to the control unit, the first end of the fourth transistor is connected to the second end of the second transistor, and the second end of the fourth transistor is connected to the first signal line. When the control unit does not output the target voltage, the fourth transistor is used to operate when it receives a high and low voltage alternating signal applied by the control unit.

6. A threshold voltage correction method, characterized in that: Applied to the correction circuit according to any one of claims 1 to 5, the correction method comprises: Setting a first transistor and a second transistor, wherein the second transistor is used to simulate the operating state of the pull-down transistor in the gate drive circuit; respectively monitoring current changes between the source and drain of the first transistor and the second transistor by a control unit, and determining a threshold voltage difference between the first transistor and the second transistor according to the current changes; If the threshold voltage difference is greater than a preset voltage, the gate driving unit signal is controlled to insert a black frame during the display process, and a target voltage is applied to the second transistor and the pull-down transistor in the gate driving circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

7. The method according to claim 6, characterized in that The step of setting the first transistor and the second transistor includes: A high-low alternating voltage signal is transmitted to the gate of the first transistor, and a high-voltage signal is transmitted to the gate of the second transistor.

8. The method according to claim 6, characterized in that The applying a target voltage to the second transistor and the pull-down transistor in the gate driving circuit until detecting that the threshold voltage difference is less than or equal to the preset voltage includes: obtaining a gate voltage of the pull-down transistor, and determining the target voltage according to the gate voltage, wherein the target voltage is greater than the gate voltage; applying the target voltage to the source of the second transistor and applying the target voltage to the pull-down transistor in the gate drive circuit; The change of the threshold voltage difference is monitored, and when it is detected that the threshold voltage difference is less than or equal to the preset voltage, application of the target voltage to the second transistor and the pull-down transistor is stopped.

9. A threshold voltage correction device, characterized in that: include: A first processing module is configured to set a first transistor and a second transistor, wherein the second transistor is configured to simulate an operating state of a pull-down transistor in a gate drive circuit; a monitoring module, configured to monitor, through a control unit, current changes between the source and drain of the first transistor and the second transistor, respectively, and determine a threshold voltage difference between the first transistor and the second transistor based on the current changes; The second processing module is used to control the gate drive unit signal to insert a black frame during the display process if the threshold voltage difference is greater than a preset voltage, and to apply a target voltage to the second transistor and the pull-down transistor in the gate drive circuit until it is detected that the threshold voltage difference is less than or equal to the preset voltage.

10. A display device, characterized in that: A threshold voltage correction circuit comprising the circuit according to any one of claims 1 to 5.

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