Gate drive circuit and display device

Abstract

This application provides a gate driving circuit and a display device. The gate driving circuit includes a drive control switch and an adjustment unit. The adjustment unit is connected to the drive control switch and is used to switch from a first state to a second state in response to a compensation signal to increase the temperature of the drive control switch; and / or switch from the second state to the first state to decrease the temperature of the drive control switch. This application utilizes the material properties of the drive control switch to first increase its temperature and then cool it, thereby solving the display abnormality problem caused by the threshold voltage deviation of the drive control switch.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a gate driving circuit and a display device. Background Technology

[0002] Amorphous oxide semiconductor IGZO (Indium Gallium Zinc Oxide) has become the mainstream material for high-resolution panel TFTs (Thin Film Transistors) due to its high mobility, good thin film uniformity, and visible light transparency. However, its defect state characteristics make the threshold voltage (Vth) of the device quite sensitive to external environmental stresses such as temperature, bias voltage, light, and humidity. In particular, temperature changes can induce a significant shift in the threshold voltage.

[0003] When a TFT device with a threshold voltage offset is applied to an actual gate drive circuit, the offset will cause insufficient pixel charging and abnormal output signal, which will lead to abnormal display problems such as line flicker, uneven brightness, and color difference in the display screen, seriously affecting the viewing experience of the end user and even causing a decrease in panel yield. Summary of the Invention

[0004] The gate driving circuit and display device provided in this application solve the display abnormality problem caused by the threshold voltage deviation of amorphous oxide semiconductor devices.

[0005] To solve the above-mentioned technical problems, the first technical solution adopted in this application is: to provide a gate driving circuit, the gate driving circuit including: a drive control switch and an adjustment unit; The regulating unit is connected to the drive control switch and is used to switch from a first state to a second state in response to a compensation signal to increase the temperature of the drive control switch; and / or switch from a second state to a first state to decrease the temperature of the drive control switch.

[0006] In one embodiment, the gate drive circuit includes: a first switch, a second switch, a bootstrap capacitor, and a third switch; Wherein, the first path terminal of the first switch is connected to the input signal terminal, the second path terminal of the first switch is connected to the first node, and the control terminal of the first switch is connected to the first path terminal of the first switch. The first path terminal of the second switch is connected to the first clock signal input terminal, the second path terminal of the second switch is connected to the output signal terminal, and the control terminal of the second switch is connected to the first node. The first end of the bootstrap capacitor is connected to the first node, and the second end of the bootstrap capacitor is connected to the output signal terminal. The first path terminal of the third switch is connected to the output signal terminal, the second path terminal of the third switch is connected to the power supply terminal, and the control terminal of the third switch is connected to the reset terminal. The first path terminal of the drive control switch is connected to the first node, the second path terminal of the drive control switch is connected to the power supply terminal, and the control terminal of the drive control switch is connected to the reset terminal.

[0007] In one embodiment, the regulating unit includes: a temperature regulating resistor and a first control unit; The first end of the temperature-regulating resistor is connected to the second path terminal of the drive control switch, and the second end of the temperature-regulating resistor is connected to the power supply terminal. The first control unit connects the first path terminal of the drive control switch and the control terminal of the drive control switch. The first control unit is used to receive a temperature control signal and a data enable signal, determine a compensation signal based on the data enable signal, control the drive control switch to turn on in response to the compensation signal, and control the temperature regulating resistor to switch from a first state to a second state using the temperature control signal; and / or switch from a second state to a first state.

[0008] In one embodiment, the first control unit includes: an inverter, a first control switch, and a second control switch; The inverter's input terminal receives a data enable signal; The first path terminal of the first control switch receives the temperature control signal, the second path terminal of the first control switch is connected to the first path terminal of the drive control switch, and the control terminal of the first control switch is connected to the output terminal of the inverter. The first path terminal of the second control switch is connected to the second clock signal input terminal, the second path terminal of the second control switch is connected to the control terminal of the drive control switch, and the control terminal of the second control switch is connected to the output terminal of the inverter.

[0009] In one embodiment, when the temperature control signal is a first level signal, the temperature regulating resistor is in a first state; when the temperature control signal is a second level signal, the temperature regulating resistor is in a second state. The voltage value of the second-level signal is greater than the voltage value of the first-level signal; and / or The duty cycle of the second level signal is less than the duty cycle of the first level signal.

[0010] In one embodiment, the adjustment unit further includes: a first diode and a second diode; The anode of the first diode is connected to the control terminal and the reset terminal of the third switch, and the cathode of the first diode is connected to the control terminal of the drive control switch. The anode of the second diode is connected to the second path terminal of the third switch, and the cathode of the second diode is connected to the power supply terminal.

[0011] In one embodiment, the adjustment unit includes: a drive compensation switch and a second control unit; Among them, the control terminal of the drive compensation switch is connected to the control terminal of the third switch, and the second path terminal of the drive compensation switch is connected to the power supply terminal. The second control unit connects the first path terminal of the drive compensation switch and the first path terminal of the drive control switch and the control terminal of the drive control switch. In response to the compensation signal, it outputs a temperature compensation signal to the drive control switch to control the drive control switch to switch from a first state to a second state; and / or switch from a second state to a first state; and outputs a drive control signal to control the drive compensation switch to turn on.

[0012] In one embodiment, the second control unit includes: a selection unit and a compensation unit; The selection unit is connected to the first path terminal of the drive control switch and the first path terminal of the drive compensation switch. The compensation unit is connected to the selection unit, and is also connected to the first path terminal of the drive control switch and the control terminal of the drive control switch. In response to the compensation signal, the selection unit closes the channel connected to the first path terminal of the drive control switch, opens the channel connected to the first path terminal of the drive compensation switch, and outputs an enable signal to the compensation unit; the compensation unit outputs a temperature compensation signal to the drive control switch in response to the enable signal. The temperature compensation signal includes a pulse signal and a low-level signal. When the temperature compensation signal is a pulse signal, the drive control switch is in the second state. When the temperature compensation signal is a low-level signal, the drive control switch is in the first state.

[0013] In one embodiment, the adjustment unit further includes: a third diode and a fourth diode; The anode of the third diode is connected to the control terminal of the third switch and the control terminal of the drive compensation switch, and the cathode of the third diode is connected to the control terminal of the drive control switch. The anode of the fourth diode is connected to the second path terminal of the third switch, and the cathode of the fourth diode is connected to the power supply terminal.

[0014] To solve the above-mentioned technical problems, the second technical solution adopted in this application is: to provide a display device, the device comprising: a display module and a backlight module; The display module includes the gate driving circuit in any of the above embodiments; The backlight module is used to provide a light source for the display module.

[0015] The beneficial effects of this application are as follows: Unlike existing technologies, this application provides a gate driving circuit and a display device. The gate driving circuit includes a drive control switch and an adjustment unit. The adjustment unit is connected to the drive control switch and is used to switch from a first state to a second state in response to a compensation signal to increase the temperature of the drive control switch; and / or switch from the second state to the first state to decrease the temperature of the drive control switch. This application utilizes the material properties of the drive control switch to first increase its temperature and then cool it, thereby solving the display abnormality problem caused by the threshold voltage deviation of the drive control switch. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of an embodiment of the gate drive circuit provided in this application; Figure 2 A circuit diagram of a first embodiment of the gate drive circuit provided in this application; Figure 3 A circuit diagram of a second embodiment of the gate drive circuit provided in this application; Figure 4 A timing diagram of the temperature control signal and data enable signal in the gate drive circuit provided in this application; Figure 5 A circuit diagram of a third embodiment of the gate drive circuit provided in this application; Figure 6 A timing diagram of the temperature compensation signal in the gate drive circuit provided in this application; Figure 7 This is a schematic diagram of an embodiment of the display device provided in this application.

[0018] Reference numerals: Display device 1000, display module 1001, backlight module 1002, gate drive circuit 100, drive control switch T0, adjustment unit 11, first switch T1, second switch T2, third switch T3, bootstrap capacitor C1, power supply terminal VSS, reset terminal Reset, first node PU, second node PD, temperature control resistor R, first control unit 12, inverter 13, first control switch 14, second control switch 15, first diode D1, second diode D2, drive compensation switch TFT1, second control unit 16, selection unit 17, compensation unit 18, third diode D3, fourth diode D4. Detailed Implementation

[0019] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0020] In the following description, specific details such as particular system architectures, interfaces, and technologies are presented for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of this application.

[0021] In this article, the term "and / or" simply describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / " generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, "more" in this article means two or more objects.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0023] Before providing a further detailed description of the embodiments of this application, the nouns and terms involved in the embodiments of this application will be explained, and the nouns and terms involved in the embodiments of this application shall be interpreted as follows.

[0024] To address the technical challenge of temperature-induced threshold voltage shift in amorphous oxide semiconductors (such as indium gallium zinc oxide) leading to display anomalies in existing technologies, this application studies the influence of temperature changes on the threshold voltage of indium gallium zinc oxide TFTs (Thin Film Transistors). Leveraging the unique properties of indium gallium zinc oxide materials, which eliminate threshold voltage drift after high-temperature heating and subsequent cooling, this application provides the gate driving circuit in the following embodiments. By actively regulating the operating temperature of the TFT device, it suppresses threshold voltage shift caused by temperature changes, thus resolving the abnormal display problem caused by temperature influences in existing technologies and improving the operational stability and display quality of the display panel.

[0025] like Figure 1 As shown, Figure 1 This is a schematic diagram of an embodiment of the gate drive circuit 100 provided in this application. In one embodiment, this application provides a gate drive circuit 100, which includes a drive control switch T0 and an adjustment unit 11. The adjustment unit 11 is connected to the drive control switch T0 and is used to switch from a first state to a second state in response to a compensation signal to increase the temperature of the drive control switch T0; and / or switch from the second state to the first state to decrease the temperature of the drive control switch T0.

[0026] It should be noted that the drive control switch T0 in this embodiment is a metal-oxide-semiconductor transistor that is prone to threshold voltage drift. The adjustment unit 11 is connected to the drive control switch T0 and is used to control its working state. The compensation signal in this embodiment is used to trigger the adjustment unit 11 to adjust the temperature of the drive control switch T0.

[0027] In this embodiment, the compensation signal can be, for example, the blanking interval after the scanning of the effective area of ​​the liquid crystal display ends when the data enable signal is low. It is understood that the data enable signal is a high-level active signal. When the data enable signal is high, the currently transmitted pixel data is valid pixel data, which will be received by the display panel and written to the corresponding pixel; when the data enable signal is low, the current data is invalid data in the blanking interval, and the driving circuit will directly ignore it. The compensation signal can also be used to cause a drift in the threshold voltage of the drive control switch T0.

[0028] In this embodiment, the first state of the adjustment unit 11 can be, for example, a cooling state (i.e., a state in which no current flows when the drive control switch T0 is turned on), or it can simply indicate that the drive control switch T0 is turned off; the second state of the adjustment unit 11 can be, for example, a heating state (i.e., a state in which the drive control switch T0 is turned on and current flows), or it can simply indicate that the drive control switch T0 is turned on.

[0029] In one embodiment, the adjustment unit 11 switches from a first state to a second state in response to a compensation signal to increase the temperature of the drive control switch T0, and / or switches from a second state to a first state to decrease the temperature of the drive control switch T0. Specifically, when the data enable signal is low, during the blanking period, while the drive control switch T0 is on, the adjustment unit 11 first controls the current to flow through the drive control switch T0 to generate heat, thereby increasing the temperature of the drive control switch T0, and then further controls no current to flow through the drive control switch T0, thereby cooling the drive control switch T0.

[0030] In another embodiment, the regulating unit 11 switches from a first state to a second state in response to a compensation signal to increase the temperature of the drive control switch T0, and / or switches from a second state to a first state to decrease the temperature of the drive control switch T0. Specifically, the regulating unit 11 frequently controls the drive control switch T0 to turn on and off in response to a drift in the threshold voltage of the drive control switch T0, so as to generate heat by utilizing the frequent on and off actions of the drive control switch T0; and after the drive control switch T0 heats up rapidly, the regulating unit 11 stops controlling the drive control switch T0 to allow it to cool down.

[0031] This embodiment utilizes the material properties of the drive control switch T0 to raise its temperature before cooling it, thereby solving the display abnormality problem caused by the deviation of the threshold voltage of the drive control switch T0.

[0032] like Figure 2 As shown, Figure 2 This is a circuit diagram of a first embodiment of the gate driving circuit provided in this application. In one embodiment, the gate driving circuit 100 includes: a first switch T1, a second switch T2, a bootstrap capacitor C1, and a third switch T3; wherein, the first path terminal of the first switch T1 is connected to the input signal terminal, the second path terminal of the first switch T1 is connected to the first node PU, and the control terminal of the first switch T1 is connected to the first path terminal of the first switch T1; the first path terminal of the second switch T2 is connected to the first clock signal input terminal, the second path terminal of the second switch T2 is connected to the output signal terminal, and the control terminal of the second switch T2 is connected to the first node PU; the first terminal of the bootstrap capacitor C1 is connected to the first node PU, and the second terminal of the bootstrap capacitor C1 is connected to the output signal terminal; the first path terminal of the third switch T3 is connected to the output signal terminal, the second path terminal of the third switch T3 is connected to the power supply terminal VSS, and the control terminal of the third switch T3 is connected to the reset terminal Reset; the first path terminal of the drive control switch T0 is connected to the first node PU, the second path terminal of the drive control switch T0 is connected to the power supply terminal VSS, and the control terminal of the drive control switch T0 is connected to the reset terminal Reset.

[0033] It should be noted that the input signal terminal receives the pulse signal output from TCON (Timing Controller) to the gate line, which is the frame start signal marking the official start of a new frame scan. The output signal terminal outputs the gate drive signal. When the second switch T2 is turned on, it outputs the gate drive signal in response to a high-level first clock signal input to the first clock signal input terminal.

[0034] In a specific embodiment, the threshold voltage V(th) drift in the gate drive circuit 100 is caused by the drive control switch T0. The main reason is that when the drive control switch T0 is turned off, the first node PU will generate a large voltage due to the presence of the bootstrap capacitor C1, resulting in a large voltage difference between the first and second path terminals of the drive control switch T0, which causes the threshold voltage of the drive control switch T0 to drift.

[0035] In a specific embodiment, the power supply terminal VSS signal in the gate driving circuit 100 refers to the TFT turn-off signal, which is used to provide a reference potential for the circuit and serves as the return path for current in the circuit, playing a role in stabilizing the potential in the electronic circuit. The reset terminal Reset signal is a reset signal, whose function is to restore the circuit or system to its initial state. It is triggered when the system starts up or when re-initialization is required, causing the relevant registers, counters, etc., to return to their set initial values. One gate driving unit outputs the turn-on signal for one row of TFTs. After the row scan is completed, it is necessary to ensure that the row TFTs are in the off state during other row scans. The generation of the turn-off signal requires the combined action of the power supply terminal VSS and the reset terminal Reset signal.

[0036] Specifically, when the Reset signal at the reset terminal is high, the second node PD (the intersection of the control terminals of drive control switch T0 and the third switch T3) is at a high level. Both drive control switch T0 and the third switch T3 are turned on. The residual charge on the first switch T1, the second switch T2, and the bootstrap capacitor C1 is discharged through drive control switch T0 and the third switch T3, maintaining the output voltage at the potential level of the power supply terminal VSS. Due to the special properties of the new material, the threshold voltage V(th) of the TFT transistor will shift to the right due to prolonged operation, resulting in a turn-off delay. The gate drive signal cannot output the power supply terminal VSS voltage in time, and the TFT cannot be turned off in time, leading to abnormal display.

[0037] In this embodiment, by setting the specific connection relationship of the first switch T1, the second switch T2, the bootstrap capacitor C1, the third switch T3, and the drive control switch T0, the gate drive circuit 100 can directly control the conduction and cutoff of the drive control switch T0 through the reset signal while maintaining normal logic function.

[0038] like Figure 3 As shown, Figure 3 This is a circuit diagram of a second embodiment of the gate drive circuit provided in this application. In one embodiment, the adjustment unit 11 includes a temperature-regulating resistor R and a first control unit 12; wherein, the first end of the temperature-regulating resistor R is connected to the second path terminal of the drive control switch T0, and the second end of the temperature-regulating resistor R is connected to the power supply terminal VSS; the first control unit 12 is connected to the first path terminal of the drive control switch T0 and the control terminal of the drive control switch T0, and the first control unit 12 is used to receive a temperature control signal and a data enable signal, determine a compensation signal based on the data enable signal, control the drive control switch T0 to turn on in response to the compensation signal, and control the temperature-regulating resistor R to switch from a first state to a second state using the temperature control signal; and / or switch from the second state to the first state.

[0039] It should be noted that the compensation signal in this embodiment is determined based on the data enable signal. When the data enable signal is low, the effective area of ​​the liquid crystal display is in the blanking interval after the scan ends. Utilizing the blanking interval to heat and cool the drive control switch T0 can effectively reduce the drift problem of the threshold voltage of the drive control switch T0, and also avoid the impact on the liquid crystal display scanning drive during the heating and cooling process of the drive control switch T0.

[0040] exist Figure 3 In this embodiment, the adjustment unit 11 in the gate drive circuit 100 specifically includes: a first control unit 12, a temperature regulating resistor R, a first diode D1, and a second diode D2. The first path terminal of the drive control switch T0 is also connected to the second path terminal of the first switch T1; the first path terminal of the third switch T3 is connected to the output signal terminal.

[0041] Combination Figure 3 and Figure 4 , Figure 3 The potential at point e at the second terminal of the temperature-regulating resistor R corresponds to Figure 4 middle e signal; Figure 3 The potential at point d on the second path terminal of the second control switch 15 corresponds to Figure 4 Medium d signal.

[0042] exist Figure 4 In the illustrated embodiment, when the data enable signal changes from high to low, the corresponding inverter 13 output signal changes from low to high; the temperature control signal also changes from a low-level signal to a pulse signal containing both high and low levels; the second clock signal remains high throughout the entire process of heating and cooling the drive control switch T0; the potential at point d of the second path terminal of the second control switch 15 is also pulled high when the data enable signal becomes low; the potential at point e of the second terminal of the temperature control resistor R is pulled high and low as the temperature control signal changes when the data enable signal becomes low; specifically, when the temperature control signal is high, the potential at point e is pulled high, causing the temperature control resistor R to generate heat and transfer it to the drive control switch T0, thereby causing the drive control switch T0 to heat up rapidly; when the temperature control signal is low, the potential at point e is pulled low, and no current flows through the temperature control resistor R. At this time, the temperature control resistor R and the drive control switch T0 are in a cooling state.

[0043] In a specific embodiment, the first control unit 12 controls the drive control switch T0 to turn on based on the received low-level data enable signal, thereby connecting the first and second path terminals of the drive control switch T0; and transmits the received temperature control signal to the temperature regulating resistor R through the drive control switch T0. The temperature regulating resistor R switches from a first state to a second state based on the received temperature control signal; and / or switches from a second state to a first state.

[0044] The first state of the temperature-regulating resistor R refers to the situation where, when the temperature control signal is low, the potential difference between the first and second terminals of the drive control switch T0 is zero. At this time, no current flows through the temperature-regulating resistor R, and both the temperature-regulating resistor R and the drive control switch T0 are in a cooling state. The second state of the temperature-regulating resistor R refers to the situation where, when the temperature control signal is high, there is a large potential difference between the first and second terminals of the drive control switch T0. At this time, a large current flows through the temperature-regulating resistor R, causing it to heat up rapidly. Due to heat transfer, the drive control switch T0 will also experience a temperature increase under the influence of the temperature-regulating resistor R.

[0045] This embodiment, by setting a specific connection between the temperature-regulating resistor R and the drive control switch T0, and through the collaborative working logic of the first control unit 12 based on the data enable signal and the temperature control signal, enables the circuit to automatically perform temperature compensation during the blanking period of the row scan. Utilizing the timing characteristics of the data enable signal to select the blanking period as the compensation window helps avoid interference with normal data transmission and image display during compensation. The temperature control signal controls the temperature-regulating resistor R to switch between the first and second states, realizing the on / off switching or magnitude adjustment of the current, thereby precisely controlling the heating and stopping process of the temperature-regulating resistor R, and utilizing the thermal repair characteristics of the IGZO material to restore its threshold voltage stability. In the subsequent cooling stage, the device temperature decreases, completing a full thermal cycle.

[0046] In one embodiment, the first control unit 12 includes: an inverter 13, a first control switch 14, and a second control switch 15; wherein, the input terminal of the inverter receives a data enable signal; the first path terminal of the first control switch 14 receives a temperature control signal, the second path terminal of the first control switch 14 is connected to the first path terminal of the drive control switch T0, and the control terminal of the first control switch 14 is connected to the output terminal of the inverter; the first path terminal of the second control switch 15 is connected to the second clock signal input terminal, the second path terminal of the second control switch 15 is connected to the control terminal of the drive control switch T0, and the control terminal of the second control switch 15 is connected to the output terminal of the inverter.

[0047] It should be noted that the inverter in this embodiment is used to invert the level of the input data enable signal. When the data enable signal is high, the inverter outputs a low level; when the data enable signal is low, the inverter outputs a high level. In this embodiment, the second clock signal is a continuously high-level signal during the heating and cooling operation of the drive control switch.

[0048] In a specific embodiment, when the data enable signal is low, the inverter 13 outputs a high-level signal to turn on the first control switch 14 and the second control switch 15. While the first control switch 14 is turned on, it receives a temperature control signal; while the second control switch 15 is turned on, it turns on the drive control switch T0 based on the received high-level second clock signal.

[0049] Specifically, when the inverter outputs a high level (i.e., the data enable signal is low and in the blanking interval), the first control switch 14 is turned on, allowing the temperature control signal to be transmitted to the temperature regulating resistor R through the drive control switch. This causes the temperature regulating resistor R to generate heat when current flows through it, and transfers this heat to the drive control switch T0, causing the drive control switch T0 to heat up rapidly. When no current flows through it, the temperature regulating resistor R and the drive control switch T0 cool down. During the effective display period when the data enable signal is high, the inverter outputs a low level signal, the first control switch 14 is turned off, cutting off the influence of the temperature control signal on the temperature regulating resistor R, ensuring that the normal display is not disturbed.

[0050] This embodiment, through the specific combination of an inverter, a first control switch 14, and a second control switch 15, enables the circuit to strictly follow the timing of the data enable signal to initiate temperature compensation during the blanking interval. The application of the inverter simplifies logic control, and using a low-level data enable signal to trigger compensation helps avoid erroneous operations during effective display. The first control switch 14, based on the synergistic effect of the temperature control signal and the inverter output, enables on-demand activation of the heating function of the temperature-adjusting resistor R, allowing adjustment of heating power according to actual needs during the blanking period, thus improving the flexibility of temperature control. The second control switch 15, based on the synergistic effect of the second clock signal and the inverter output, enables the drive control switch T0 to conduct during the blanking period, thereby utilizing the thermal repair characteristics of the IGZO material to restore the threshold voltage of the drive control switch T0.

[0051] In one embodiment, when the temperature control signal is a first level signal, the temperature regulating resistor R is in a first state; when the temperature control signal is a second level signal, the temperature regulating resistor R is in a second state; the voltage value of the second level signal is greater than the voltage value of the first level signal; and / or the duty cycle of the second level signal is less than the duty cycle of the first level signal.

[0052] It should be noted that in this embodiment, the first level signal refers to a low level signal, and the second level signal refers to a high level signal. That is, when the temperature control signal is a low level signal, the temperature regulating resistor R is in the first state; when the temperature control signal is a high level signal, the temperature regulating resistor R is in the second state.

[0053] In this embodiment, the temperature control signal can be, for example, an alternating high and low level pulse signal. Specifically, the duty cycle of the second level signal is less than that of the first level signal. This means that the duty cycle of the high level signal of the temperature control signal is less than that of the low level signal. Specifically, the time during which no current flows through the temperature regulating resistor R is longer than the time during which current flows, meaning the heating time of the temperature regulating resistor R and the drive control switch T0 is less than the cooling time. Based on this, the threshold voltage recovery effect of the drive control switch T0 can be improved.

[0054] This embodiment limits the second-level signal voltage to be greater than the first-level signal, allowing the temperature-regulating resistor R to receive a larger driving voltage in the second state. This results in a larger current flowing through the resistor, increasing the heating power and heating rate. This facilitates the rapid heating of the drive control switch T0 to the temperature required for threshold voltage recovery within the short blanking period. By limiting the difference in duty cycle, precise control of the heating power or time is achieved, ensuring that the heating and cooling rhythm matches the thermal repair characteristics of the IGZO material. This maximizes the thermal repair effect without damaging the device.

[0055] In one embodiment, the adjustment unit 11 further includes: a first diode D1 and a second diode D2; wherein, the anode of the first diode D1 is connected to the control terminal and the reset terminal Reset of the third switch T3, and the cathode of the first diode D1 is connected to the control terminal of the drive control switch T0; the anode of the second diode D2 is connected to the second path terminal of the third switch T3, and the cathode of the second diode D2 is connected to the power supply terminal VSS.

[0056] It should be noted that, in this embodiment, the primary function of the first diode D1 is to isolate the influence of the control terminal of the drive control switch T0 on the third switch T3. Understandably, when the data enable signal is low (i.e., during the blanking interval of the horizontal scan) and the drive control switch T0 is heated or cooled, it is necessary to ensure that the third switch T3 is in the off state. Utilizing the unidirectional conductivity of the first diode D1, the high-level signal input to the drive control switch T0 can be effectively isolated, preventing it from affecting the third switch T3.

[0057] In a specific embodiment, when the Reset terminal or the control terminal of the third switch T3 outputs a high-level signal to trigger a specific action, the high level can be conducted to the control terminal of the drive control switch T0 through the first diode D1, so that it is turned on or maintained in the on state; when the potential of the control terminal of the drive control switch T0 is higher than the potential of the Reset terminal or the control terminal of the third switch T3, the first diode D1 is turned off to prevent high potential backflow, thereby protecting the front-end control signal from the influence of the voltage fluctuation of the drive node.

[0058] It should be noted that when the data enable signal is low (i.e., during the blanking interval of the horizontal scan), the voltage signal input to the first and second path terminals of the drive control switch T0 during heating and cooling operations will also affect the power supply terminal VSS. Therefore, to prevent the voltage signal output from the second path terminal of the drive control switch T0 from flowing back to the output of the entire circuit, the anode of the second diode D2 is connected to the second path terminal of the third switch T3, and the cathode of the second diode D2 is connected to the power supply terminal VSS. Based on this, the charge on the third switch T3 can be released to the power supply terminal VSS, but the voltage output by the drive control switch T0 will not affect the third switch T3.

[0059] When the potential of the second path terminal of the third switch T3 exceeds the potential of the power supply terminal VSS due to switch action or induction effect, the second diode D2 conducts, discharging excess charge to the power supply terminal VSS or limiting the potential of this node to not exceed the power supply voltage plus the forward voltage drop of the diode, thereby preventing overvoltage damage to the third switch T3 or subsequent circuits; when the potential of the second path terminal of the third switch T3 is lower than or equal to the potential of the power supply terminal VSS, the second diode D2 is cut off, which does not affect the normal operation of the circuit.

[0060] This embodiment introduces a first diode D1, enabling the reset signal or the control signal of the third switch T3 to be transmitted unidirectionally and reliably to the control terminal of the drive control switch T0. Simultaneously, it prevents the high potential at the control terminal of the drive control switch T0 from interfering with the reset terminal or the control logic of the third switch T3, thus improving the accuracy of signal transmission and anti-interference capability. Introducing a second diode D2 effectively clamps the potential of the second path terminal of the third switch T3 near the power supply voltage, preventing voltage spikes caused by switching action or parasitic capacitance coupling from exceeding the power supply voltage and damaging the devices. This helps protect circuit components and improves the stability of circuit operation.

[0061] In a specific embodiment, the drive control switch T0 is the most prone to threshold voltage drift in the gate drive circuit 100. The main reason is that when the drive control switch T0 is in the off state, the oxygen vacancies in the IGZO film migrate to the boundary between IGZO and GI (Gate Insulator) and the source end under the action of the electric field. Due to the trapping effect of oxygen vacancies on electrons, the transfer characteristic curve eventually shifts positively, which causes the threshold voltage of the drive control switch T0 to drift.

[0062] The following embodiments of this application are based on the technical principle that migrated oxygen vacancies can be restored after heating to restore the threshold voltage of the drive control switch T0.

[0063] like Figure 5 As shown, Figure 5 This is a circuit diagram of a third embodiment of the gate driving circuit provided in this application. In one embodiment, the adjustment unit 11 includes: a driving compensation switch TFT1 and a second control unit 16; wherein, the control terminal of the driving compensation switch TFT1 is connected to the control terminal of the third switch T3, and the second path terminal of the driving compensation switch TFT1 is connected to the power supply terminal VSS; the second control unit 16 is connected to the first path terminal of the driving compensation switch TFT1 and the first path terminal and control terminal of the driving control switch T0, and in response to the compensation signal, outputs a temperature compensation signal to the driving control switch T0, controls the driving control switch T0 to switch from a first state to a second state; and / or switch from a second state to a first state; and outputs a driving control signal to control the driving compensation switch TFT1 to be turned on.

[0064] It should be noted that the drive compensation switch TFT1 is used to replace the drive control switch T0 in the process of restoring the threshold voltage of the drive control switch T0 to normal through high temperature heating and then cooling. The drive compensation switch TFT1 and the drive control switch T0 have the same specifications.

[0065] In this embodiment, the compensation signal is generated when the threshold voltage of the drive control switch T0 drifts. The first state of the drive control switch T0 is the off state, and the second state of the drive control switch T0 is a state of frequent switching between on and off.

[0066] In a specific embodiment, the temperature compensation signal includes a pulse signal and a low-level signal. When the temperature compensation signal is a pulse signal, the drive control switch T0 is in the second state, and when the temperature compensation signal is a low-level signal, the drive control switch T0 is in the first state.

[0067] In a specific embodiment, the second control unit 16 switches the connection path with the first path terminal of the drive control switch T0 based on the compensation signal, i.e., when the threshold voltage drift of the drive control switch T0 occurs. Simultaneously, the second control unit 16 outputs a temperature compensation signal to the drive control switch T0, and connects to the first path terminal of the drive compensation switch TFT1, causing the drive compensation switch TFT1 to conduct when the Reset signal is high, thus replacing the drive control switch T0 and ensuring normal display driving of the liquid crystal display.

[0068] exist Figure 5 In this embodiment, the adjustment unit 11 in the gate drive circuit 100 specifically includes: a drive compensation switch TFT1, a second control unit 16, a third diode D3, and a fourth diode D4.

[0069] In this embodiment, the on and off states of the drive control switch T0 are switched at high frequency, causing it to heat up rapidly due to the rapid switching between on and off states. Simultaneously, the second control unit 16 outputs a drive control signal to control the operation of the drive compensation switch TFT1, ensuring that the drive compensation switch TFT1 remains on to provide a stable current path during the switching between on and off states of the drive control switch T0.

[0070] In one embodiment, the second control unit 16 includes a selection unit 17 and a compensation unit 18; wherein the selection unit 17 is connected to the first channel terminal of the drive control switch T0 and the first channel terminal of the drive compensation switch TFT1; the compensation unit 18 is connected to the selection unit 17 and to the first channel terminal and control terminal of the drive control switch T0; in response to a compensation signal, the selection unit 17 closes the channel connected to the first channel terminal of the drive control switch T0, opens the channel connected to the first channel terminal of the drive compensation switch TFT1, and outputs an enable signal to the compensation unit 18; the compensation unit 18 outputs a temperature compensation signal to the drive control switch T0 in response to the enable signal.

[0071] It should be noted that the function of the selection unit 17 in this embodiment is to switch the connection path between the second control unit 16 and the drive control switch T0 when a threshold voltage drift is detected in the drive control switch T0.

[0072] In one embodiment, in response to a compensation signal, selection unit 17 closes the channel connected to the first path terminal of drive control switch T0 and opens the channel connected to the first path terminal of drive compensation switch TFT1. For example, switches can be set on the corresponding channels. It is understood that selection unit 17, in response to the compensation signal, disconnects the switch on the channel connected to the first path terminal of drive control switch T0 and opens the switch on the channel connected to the first path terminal of drive compensation switch TFT1. In specific embodiments, the switch type can be, for example, a MOS (Metal Oxide Semiconductor) transistor, a triode, a relay switch, etc.

[0073] In other embodiments, the method for the selection unit to switch the connection path between the second control unit 16 and the drive control switch T0 is not limited.

[0074] Specifically, selection unit 17 first disconnects from the first path terminal of drive control switch T0, and simultaneously connects to the first path terminal of drive compensation switch TFT1. Selection unit 17 also transmits an enable signal generated based on a compensation signal—that is, when a threshold voltage drift of drive control switch T0 is detected—to compensation unit 18. Compensation unit 18 connects the control terminal and the first path terminal of drive control switch T0.

[0075] In a specific embodiment, in normal display mode, the selection unit 17 maintains a channel connected to the drive control switch T0 (e.g., Figure 5 Channel ① in the middle is turned on, while the channel connected to the drive compensation switch TFT1 (e.g.) is turned on. Figure 5 Channel ② is closed to ensure normal scanning signal pass-through. When a time when temperature compensation is required is detected, i.e., when the threshold voltage of the drive control switch T0 drifts, the selection unit 17 performs a switching action: closing the channel to the drive control switch T0, opening the channel to the drive compensation switch TFT1, and transmitting the enable signal to the compensation unit 18.

[0076] Furthermore, after receiving the enable signal, the compensation unit 18 starts working and generates a specific temperature compensation signal through a specific channel (e.g., Figure 5 The output of channel ③ is sent to the control terminal and the first path terminal of the drive control switch T0. The temperature compensation signal consists of alternating pulse signals and low-level signals. When the temperature compensation signal is a pulse signal, the drive control switch T0 is turned on when the pulse is high and turned off when the pulse is low, which is the second state. By frequently controlling the on and off states of the drive control switch T0, the temperature of the drive control switch T0 is increased. When the temperature compensation signal is a low-level signal, the drive control switch T0 remains off, which is the first state. The current is cut off, and the device cools down through heat dissipation.

[0077] like Figure 6 As shown, the processing cycle for heating and cooling the drive control switch T0 is T, where T is the time of one frame. T is divided into heating time t1 and cooling time t2. At time t1, the signal output to the first and second path terminals of the drive control switch T0 is a high-frequency pulse signal. When the input is high, the drive control switch T0 will turn on and the output will be high; otherwise, it will be low. At this time, the drive control switch T0 is in a rapid switching state and will heat up quickly. Since this is for a new type of material, cooling after high temperature has a more significant effect on restoring the drive control switch T0 to normal. Within the entire processing cycle T, there is also a cooling time t2. During this cooling time, the drive control switch T0 is in a normally closed state, and the drive control switch T0 will complete the cooling process within this time.

[0078] In this embodiment, the ratio of heating time to cooling time can be determined based on the characteristics of the specific components used. This application does not impose any limitations on this.

[0079] This embodiment, through the cooperative structure of selection unit 17 and compensation unit 18, enables the circuit to seamlessly switch between normal driving and temperature compensation modes, avoiding signal conflicts and path interference. Under the action of the compensation signal, selection unit 17 closes the drive control switch T0 channel and opens the drive compensation switch TFT1 channel, while simultaneously transmitting an enable signal to compensation unit 18, ensuring that the compensation operation does not affect the normal row scan timing. Compensation unit 18 responds to the enable signal by outputting a composite temperature compensation signal containing a pulse and a low level, causing drive control switch T0 to be in a second state for rapid heating during the pulse period and in a first state for cooling during the low level period, thus correcting the threshold voltage drift of drive control switch T0.

[0080] In one embodiment, the adjustment unit 11 further includes a third diode D3 and a fourth diode D4; wherein the anode of the third diode D3 is connected to the control terminal of the third switch T3 and the control terminal of the drive compensation switch TFT1, and the cathode of the third diode D3 is connected to the control terminal of the drive control switch T0; the anode of the fourth diode D4 is connected to the second path terminal of the third switch T3, and the cathode of the fourth diode D4 is connected to the power supply terminal VSS.

[0081] It should be noted that the main function of the third diode D3 in this embodiment is to isolate the influence of the signal input to the drive control switch T0 on the third switch T3. In a specific embodiment, when the reset terminal or the control terminal of the third switch T3 outputs a high-level signal to trigger a specific action, this high level can be conducted through the third diode D3 to the control terminal of the drive control switch T0, making it conduct or maintain its conduction state; while when the potential of the control terminal of the drive control switch T0 is higher than the potential of the reset terminal or the control terminal of the third switch T3, the third diode D3 is cut off to prevent high potential backflow, thereby protecting the front-end control signal from the influence of drive node voltage fluctuations.

[0082] To prevent the voltage signal output from the second path terminal of the drive control switch T0 from flowing back to the output terminal of the entire circuit, the anode of the fourth diode D4 is connected to the second path terminal of the third switch T3, and the cathode of the fourth diode D4 is connected to the power supply terminal VSS. Based on this, the charge on the third switch T3 can be released to the power supply terminal VSS, but the voltage output from the drive control switch T0 will not affect the third switch T3.

[0083] When the potential of the second path terminal of the third switch T3 exceeds the potential of the power supply terminal VSS due to switch action or induction effect, the fourth diode D4 conducts, discharging excess charge to the power supply terminal VSS or limiting the potential of this node to not exceed the power supply voltage plus the forward voltage drop of the diode, thereby preventing overvoltage damage to the third switch T3 or subsequent circuits; when the potential of the second path terminal of the third switch T3 is lower than or equal to the potential of the power supply terminal VSS, the fourth diode D4 is cut off, which does not affect the normal operation of the circuit.

[0084] This embodiment introduces a third diode D3, enabling the reset signal or the control signal of the third switch T3 to be transmitted unidirectionally and reliably to the control terminal of the drive control switch T0. Simultaneously, it prevents the high potential at the control terminal of the drive control switch T0 from interfering with the reset terminal or the control logic of the third switch T3, thus improving the accuracy of signal transmission and anti-interference capability. The introduction of a fourth diode D4 effectively clamps the potential of the second path terminal of the third switch T3 near the power supply voltage, preventing voltage spikes caused by switching action or parasitic capacitance coupling from exceeding the power supply voltage and damaging the devices. This helps protect circuit components and improves the stability of circuit operation.

[0085] like Figure 7 As shown, Figure 7 This is a schematic diagram of an embodiment of the display device provided in this application. In one embodiment, this application provides a display device 1000, which includes a display module 1001 and a backlight module 1002. The display module 1001 includes the gate driving circuit 100 in any of the above embodiments; the backlight module 1002 is used to provide a light source for the display module 1001.

[0086] In some embodiments, the functions or modules of the apparatus provided in this disclosure can be used to perform the methods described in the above embodiments. The specific implementation can be referred to the description in the above embodiments, and for the sake of brevity, it will not be repeated here.

[0087] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0088] The above are merely embodiments of this application and do not limit the scope of patent protection of this application. Any equivalent structural or procedural changes made using the content of this application’s specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A gate driving circuit, characterized in that, The gate driving circuit includes: Drive control switch; An adjustment unit is connected to the drive control switch, and the adjustment unit is used to switch from a first state to a second state in response to a compensation signal to increase the temperature of the drive control switch; and / or switch from the second state to the first state to decrease the temperature of the drive control switch; A first switch, wherein the first path terminal of the first switch is connected to the input signal terminal, the second path terminal of the first switch is connected to the first node, and the control terminal of the first switch is connected to the first path terminal of the first switch. The second switch has a first path terminal connected to the first clock signal input terminal, a second path terminal connected to the output signal terminal, and a control terminal connected to the first node. A bootstrap capacitor, wherein the first end of the bootstrap capacitor is connected to the first node, and the second end of the bootstrap capacitor is connected to the output signal terminal; The third switch has its first path terminal connected to the output signal terminal, its second path terminal connected to the power supply terminal, and its control terminal connected to the reset terminal. The first path terminal of the drive control switch is connected to the first node, the second path terminal of the drive control switch is connected to the power supply terminal, and the control terminal of the drive control switch is connected to the reset terminal.

2. The gate driving circuit according to claim 1, characterized in that, The adjustment unit includes: A temperature-regulating resistor, the first end of which is connected to the second path terminal of the drive control switch, and the second end of which is connected to the power supply terminal; A first control unit is connected to the first path terminal of the drive control switch and the control terminal of the drive control switch. The first control unit is used to receive a temperature control signal and a data enable signal, determine the compensation signal based on the data enable signal, control the drive control switch to turn on in response to the compensation signal, and control the temperature regulating resistor to switch from the first state to the second state using the temperature control signal; and / or switch from the second state to the first state.

3. The gate driving circuit according to claim 2, characterized in that, The first control unit includes: An inverter, the input of which receives the data enable signal; A first control switch, the first path terminal of the first control switch receives the temperature control signal, the second path terminal of the first control switch is connected to the first path terminal of the drive control switch, and the control terminal of the first control switch is connected to the output terminal of the inverter. The second control switch has a first path terminal connected to the second clock signal input terminal, a second path terminal connected to the control terminal of the drive control switch, and a control terminal connected to the output terminal of the inverter.

4. The gate driving circuit according to claim 2, characterized in that, When the temperature control signal is a first level signal, the temperature regulating resistor is in a first state; when the temperature control signal is a second level signal, the temperature regulating resistor is in a second state. The voltage value of the second level signal is greater than the voltage value of the first level signal; and / or The duty cycle of the second level signal is less than the duty cycle of the first level signal.

5. The gate driving circuit according to claim 3, characterized in that, The adjustment unit further includes: A first diode, the anode of which is connected to the control terminal and the reset terminal of the third switch, and the cathode of which is connected to the control terminal of the drive control switch; The second diode has its anode connected to the second path terminal of the third switch, and its cathode connected to the power supply terminal.

6. The gate driving circuit according to claim 1, characterized in that, The adjustment unit includes: A drive compensation switch is provided, the control terminal of which is connected to the control terminal of the third switch, and the second path terminal of the drive compensation switch is connected to the power supply terminal. The second control unit is connected to the first path terminal of the drive compensation switch and the first path terminal of the drive control switch and the control terminal of the drive control switch. In response to the compensation signal, it outputs a temperature compensation signal to the drive control switch to control the drive control switch to switch from the first state to the second state; and / or switch from the second state to the first state; and outputs a drive control signal to control the drive compensation switch to be turned on.

7. The gate driving circuit according to claim 6, characterized in that, The second control unit includes: The selection unit is connected to the first path terminal of the drive control switch and the first path terminal of the drive compensation switch. A compensation unit is connected to the selection unit and to the first path terminal of the drive control switch and the control terminal of the drive control switch. In response to the compensation signal, the selection unit closes the channel connected to the first path terminal of the drive control switch, opens the channel connected to the first path terminal of the drive compensation switch, and outputs an enable signal to the compensation unit; the compensation unit outputs the temperature compensation signal to the drive control switch in response to the enable signal. The temperature compensation signal includes a pulse signal and a low-level signal. When the temperature compensation signal is the pulse signal, the drive control switch is in the second state. When the temperature compensation signal is the low-level signal, the drive control switch is in the first state.

8. The gate driving circuit according to claim 6, characterized in that, The adjustment unit further includes: The third diode has its anode connected to the control terminal of the third switch and the control terminal of the drive compensation switch, and its cathode connected to the control terminal of the drive control switch. The fourth diode has its anode connected to the second path terminal of the third switch and its cathode connected to the power supply terminal.

9. A display device, characterized in that, include: The display module includes the gate driving circuit according to any one of claims 1 to 8; A backlight module, which provides a light source for the display module.

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