Display device and driving method thereof

Abstract

The application discloses a display device and a driving method thereof. The display device comprises a pixel circuit, a gate driving circuit and a display driver. The gate driving circuit is connected with a switch module in the pixel circuit, and is used for outputting a gate driving signal for driving the switch module. The gate driving signal comprises a first level and a second level, and the first level is greater than the second level. The switch module comprises a threshold compensation module. The display driver is connected with the gate driving circuit, and is used for controlling the gate driving circuit to increase the absolute value of the second level in the output gate driving signal when the luminance attenuation degree of the display device is greater than a set threshold, so as to enhance the negative bias temperature stress (NBTS) of the switch module. The second level is a level for turning off the switch module. The application can solve the color cast problem when the luminance changes, and improve the display effect.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display device and its driving method. Background Technology

[0002] With the development of display technology, users have increasingly higher requirements for display quality.

[0003] While current display devices have advantages in terms of power consumption and refresh rate, they suffer from color distortion due to brightness changes when users slowly drag the brightness bar. Summary of the Invention

[0004] This invention provides a display device and its driving method, which can solve the color shift problem when brightness changes and improve the display effect.

[0005] In a first aspect, embodiments of the present invention provide a display device, comprising: a pixel circuit, a gate driving circuit, and a display driver; the gate driving circuit is connected to a switching module in the pixel circuit, and the gate driving circuit is used to output a gate driving signal to drive the switching module; the gate driving signal includes a first level and a second level, wherein the first level is greater than the second level; the switching module includes a threshold compensation module; the display driver is connected to the gate driving circuit and is used to control the gate driving circuit to increase the absolute value of the second level in the output gate driving signal when the brightness attenuation of the display device is greater than a set threshold, so as to enhance the negative bias temperature stress (NBTS) of the switching module; the second level is a level that turns off the switching module.

[0006] Optionally, the display driver includes: a level control signal generation module and a power supply module; the level control signal generation module is used to output a level control signal according to the brightness attenuation level when the brightness attenuation level is greater than a set threshold; the power supply module is connected to the level control signal generation module and the gate drive circuit, and the power supply module is used to increase the absolute value of the second level output to the gate drive circuit according to the level control signal, and the gate drive circuit is used to generate a gate drive signal according to the second level.

[0007] Optionally, the display driver stores a brightness potential relationship table, which is a mapping relationship table between the degree of brightness attenuation and the second level; the power supply module calls the brightness potential relationship table according to the level control signal, and increases the absolute value of the second level output to the gate drive circuit according to the brightness potential relationship table.

[0008] Optionally, the level control signal generation module includes: a brightness time conversion unit, a brightness attenuation degree determination unit, and a logic control unit; the brightness time conversion unit receives the cumulative screen-on duration signal and determines the real-time brightness of the display device based on the cumulative screen-on duration signal; the brightness attenuation degree determination unit is connected to the brightness time conversion unit and is used to determine the brightness attenuation degree based on the initial brightness, real-time brightness, and cumulative screen-on duration of the display device; the logic control unit is connected to the brightness attenuation degree determination unit and is used to output a level control signal with a corresponding number of pulses based on the brightness attenuation degree when the brightness attenuation degree of the display device is greater than a set threshold.

[0009] Optionally, the pixel circuit further includes a driving module and a first initialization module; the first initialization module is connected between the first initialization signal line and the control terminal of the driving module, and the first initialization module is used to write the first initialization voltage provided by the first initialization signal line to the control terminal of the driving module according to the first gate driving signal; the high potential of the first gate driving signal is the first level, and the low potential of the first gate driving signal is the second level; the first terminal of the threshold compensation module is connected to the first terminal of the driving module, and the second terminal of the threshold compensation module is connected to the control terminal of the driving module, and the threshold compensation module is used to perform threshold compensation on the driving module according to the second gate driving signal; the high potential of the second gate driving signal is the first level, and the low potential of the second gate driving signal is the second level.

[0010] Optionally, the threshold compensation module includes a first transistor; the first electrode of the first transistor serves as the first terminal of the threshold compensation module, the second electrode of the first transistor serves as the second terminal of the threshold compensation module, and the gate of the first transistor serves as the control terminal of the threshold compensation module.

[0011] Optionally, the first transistor is an indium gallium zinc oxide transistor.

[0012] Optionally, the first initialization module includes a second transistor; the gate of the second transistor is connected to a first gate drive signal, the first terminal of the second transistor is connected to a first initialization signal line, and the second terminal of the second transistor is connected to the control terminal of the drive module.

[0013] Optionally, the second transistor is an indium gallium zinc oxide transistor.

[0014] Optionally, the pixel circuit further includes a data writing module; the data writing module is connected between the data line and the second end of the driving module, and the data writing module is used to transmit the data voltage on the data line to the second end of the driving module according to the third gate driving signal; the high potential of the third gate driving signal is the first level, and the low potential of the third gate driving signal is the second level.

[0015] Optionally, the data writing module includes a third transistor, the gate of the third transistor is connected to a third gate drive signal, the first terminal of the third transistor is connected to a data line, and the second terminal of the third transistor is connected to the second terminal of the drive module.

[0016] Optionally, the third transistor is a PMOS transistor.

[0017] Optionally, the pixel circuit further includes a light-emitting module and a light-emitting control module; the light-emitting control module, the driving module, and the light-emitting module are connected between the first power supply and the second power supply, and the light-emitting control module is used to control the light-emitting module to emit light according to the driving current output by the driving module according to the light-emitting control signal.

[0018] Optionally, the pixel circuit also includes a storage module connected between the first power supply and the control terminal of the drive module, and the storage module is used to store the voltage of the control terminal of the drive module.

[0019] Optionally, the storage module includes a storage capacitor, with a first end of the storage capacitor connected to a first power supply and a second end of the storage capacitor connected to the control terminal of the drive module.

[0020] Optionally, the light-emitting control module includes a first light-emitting control module and a second light-emitting control module; the first light-emitting control module is connected between the first power supply and the second end of the driving module, the second light-emitting control module is connected between the first end of the driving module and the first end of the light-emitting module, the second end of the light-emitting module is connected to the second power supply, and the control terminals of the first and second light-emitting control modules are connected to light-emitting control signals.

[0021] Optionally, the first light-emitting control module includes a fourth transistor, and the second light-emitting control module includes a fifth transistor; the first terminal of the fourth transistor is connected to a first power supply, the second terminal of the fourth transistor is connected to the second terminal of the driving module, and the gate of the fourth transistor is connected to the light-emitting control signal line; the first terminal of the fifth transistor is connected to the first terminal of the driving module, the second terminal of the fifth transistor is connected to the first terminal of the light-emitting module, and the gate of the fifth transistor is connected to the light-emitting control signal line.

[0022] Optionally, both the fourth and fifth transistors are PMOS transistors.

[0023] Optionally, the pixel circuit further includes a second initialization module, which is connected between the second initialization signal line and the first end of the light-emitting module. The second initialization module is used to write the second initialization voltage provided by the second initialization signal line to the first end of the light-emitting module according to the fourth gate drive signal; the high potential of the fourth gate drive signal is the first level, and the low potential of the fourth gate drive signal is the second level.

[0024] Optionally, the second initialization module includes a sixth transistor, the gate of the sixth transistor is connected to a fourth gate drive signal, the first terminal of the sixth transistor is connected to a second initialization signal line, and the second terminal of the sixth transistor is connected to a first terminal of the light-emitting module.

[0025] Optionally, the sixth transistor is a PMOS transistor.

[0026] In a second aspect, embodiments of the present invention provide a driving method for a display device, the display device comprising: a pixel circuit, a gate driving circuit, and a display driver; the gate driving circuit is connected to a switching module in the pixel circuit, and the gate driving circuit is used to output a gate driving signal to drive the switching module; the gate driving signal includes a first level and a second level, the first level being greater than the second level; the switching module includes a threshold compensation module; the display driver is connected to the gate driving circuit; the driving method for the display device includes:

[0027] When the brightness decay of the display device exceeds a set threshold, the control gate drive circuit increases the absolute value of the second level in the output gate drive signal to enhance the negative bias temperature stress (NBTS) of the switching module; the second level is the level that turns off the switching module.

[0028] Optionally, when the brightness attenuation of the display device is greater than a set threshold, the step of controlling the gate drive circuit to increase the absolute value of the second level in the output gate drive signal to enhance the negative bias temperature stress (NBTS) of the switching module includes: when the brightness attenuation is greater than the set threshold, outputting a level control signal according to the brightness attenuation; and increasing the absolute value of the second level output to the gate drive circuit according to the level control signal.

[0029] Optionally, the step of increasing the absolute value of the second level output to the gate drive circuit according to the level control signal includes: calling the brightness potential relationship table according to the level control signal, and increasing the absolute value of the second level output to the gate drive circuit according to the brightness potential relationship table; wherein, the brightness potential relationship table is a mapping relationship table between the brightness attenuation degree and the second level.

[0030] Optionally, when the brightness attenuation of the display device exceeds a set threshold, the step of outputting a level control signal based on the brightness attenuation includes: determining the real-time brightness of the display device based on the cumulative screen-on duration signal; determining the brightness attenuation based on the initial brightness, real-time brightness, and cumulative screen-on duration of the display device; and outputting a level control signal with a corresponding number of pulses based on the brightness attenuation when the brightness attenuation of the display device exceeds the set threshold.

[0031] The display device provided in this invention includes a pixel circuit, a gate driving circuit, and a display driver. When the brightness decay of the display device exceeds a set threshold, the display driver controls the gate driving circuit to increase the absolute value of the second level in the output gate driving signal, thereby enhancing the NBTS effect of the threshold compensation module. The threshold compensation module is responsible for compensating for threshold voltage changes in the driving module during the data writing and threshold compensation phases. If the threshold voltage of the threshold compensation module becomes more negative due to the NBTS effect, the conduction current when the threshold compensation module is turned on will increase under the same high-level driving signal. The increased conduction current allows more charge to be injected into the gate of the driving transistor, increasing its gate voltage. This can offset the threshold voltage drift of the driving transistor caused by long-term use, thereby preventing a decrease in driving current during the light-emitting phase, solving the color shift problem during brightness decay, and improving the display effect.

[0032] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram illustrating the relationship between the degree of brightness decay and the cumulative screen-on time provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of another display device provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of another display device provided in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of another pixel circuit provided in an embodiment of the present invention;

[0040] Figure 7 This is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention;

[0041] Figure 8 This is a flowchart of a driving method for a display device provided in an embodiment of the present invention;

[0042] Figure 9 This is a flowchart of another driving method for a display device provided in an embodiment of the present invention;

[0043] Figure 10 This is a flowchart of another driving method for a display device provided in an embodiment of the present invention. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0046] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a pixel circuit provided in an embodiment of the present invention. Figure 1 and Figure 2 As shown, the display device includes: pixel circuit 10, gate driving circuit 20 and display driver 30.

[0047] The gate driving circuit 20 is connected to the switching module in the pixel circuit 10. The gate driving circuit 20 is used to output the gate driving signal to drive the switching module. The gate driving signal includes a first level and a second level VGL, where the first level is greater than the second level VGL. The switching module includes a threshold compensation module 110.

[0048] The display driver 30 is connected to the gate drive circuit 20 and is used to control the gate drive circuit 20 to increase the absolute value of the second level VGL in the output gate drive signal when the brightness decay of the display device is greater than a set threshold, so as to enhance the negative bias temperature stress NBTS of the switching module; the second level VGL is the level that turns off the switching module.

[0049] Specifically, the display device further includes a display panel, which includes a gate driving circuit 20 disposed in the non-display area NAA and pixel circuits 10 arranged in an array in the display area AA of the display panel. The gate driving circuit 20 includes a plurality of cascaded shift registers 210; the shift registers 210 are used to provide gate driving signals to the pixel circuits 10 of the corresponding row. Each shift register 210 is connected to at least one gate driving signal line LS and provides gate driving signals to the sub-pixels of the corresponding row through the gate driving signal line LS, and each column of sub-pixels is connected to a data line DL.

[0050] During screen display, data is written to each pixel circuit through line-by-line scanning. Specifically, the shift register 210 provides a gate drive signal to the pixel circuit via the gate drive signal line LS. Corresponding to the duration of the gate drive signal's on-level, the data voltage on the data line DL is transmitted to the corresponding pixel circuit to achieve data writing. Each pixel circuit 10 outputs a drive current based on the data voltage, driving the light-emitting device to emit light for display. When the gate drive signal line LS provides an off-level, the data voltage on the data line DL cannot be transmitted to the corresponding pixel circuit 10, and no data is written.

[0051] The pixel circuit 10 can have any existing pixel circuit structure. The gate driving circuit 20 may include multiple cascaded shift registers 210. Each shift register 210 can be connected to a functional module in one or more rows of pixel circuits 10 via a corresponding gate driving signal line LS. For example, it can be connected to a functional module in pixel circuit 10 used to control the gate initialization of the driving transistor. For example, a row of pixel circuits 10 may also correspond to two shift registers. One shift register can be connected to a functional module in the odd-numbered columns of pixel circuits 10 in a row of pixel circuits 10 via a corresponding gate driving signal line LS, and the other shift register can be connected to a functional module in the even-numbered columns of pixel circuits 10 in a row of pixel circuits 10 via a corresponding gate driving signal line LS.

[0052] Optionally, the pixel circuit 10 further includes a driving module 120. A first terminal of the threshold compensation module 110 is connected to the first terminal of the driving module 120, and a second terminal of the threshold compensation module 110 is connected to the control terminal of the driving module 120. The threshold compensation module 110 is used to perform threshold compensation on the driving module 120 during the data writing and threshold compensation stages. The driving module 120 includes a driving transistor DTFT.

[0053] The gate driving circuit 20 can be a scanning circuit or a light-emitting control driving circuit, etc. The gate driving circuit 20 outputs a gate driving signal based on at least the input signal and the clock pulse signal. The gate driving signal is transmitted to the pixel unit of the display area AA of the display panel via the gate driving signal line LS to drive the pixel unit display. The pixel unit includes a pixel circuit 10 and a light-emitting element. Exemplarily, the gate driving signal can include a gate driving signal or a light-emitting control signal, etc. Exemplarily, when the display panel includes multiple rows of pixel circuits 10, multiple shift registers in each gate driving circuit are cascaded. The multiple cascaded shift registers provide gate driving signals to at least one row of pixel circuits 10 respectively. The input signal of the first-stage shift register can include the input signal provided by the display driver 30 to the start signal line STV, and the input signals of other-stage shift registers can be the gate driving signal output by the previous-stage shift register.

[0054] Brightness decay refers to the percentage decrease in the real-time brightness of a display panel relative to its initial brightness over a certain period of time.

[0055] The display driver 30 stores a brightness decay table relating brightness to cumulative screen-on time. This brightness decay table can be represented as follows: Figure 3 The curve shown can be obtained through experiments or simulations. The vertical axis (Lv) represents brightness, and the horizontal axis (T) represents cumulative screen-on time. Lv0 represents the initial brightness of the display panel; as the cumulative screen-on time increases, the brightness increases as shown... Figure 3 The brightness decays in the same way as the curve shown. The display driver 30 can first obtain the cumulative screen-on time of the display panel, then obtain the real-time brightness corresponding to the cumulative screen-on time according to the brightness time decay relationship table, and then determine the degree of brightness decay of the display panel according to the initial brightness, real-time brightness, and cumulative screen-on time. The cumulative screen-on time refers to the power-on time of the display device.

[0056] In other words,

[0057] Optionally, the display driver 30 also stores a brightness potential relationship table between the brightness attenuation level and the second level VGL. As the brightness attenuation level gradually increases, the absolute value of the second level VGL gradually increases. For example, a brightness attenuation level of 10% corresponds to a second level VGL of -6V, and a brightness attenuation level of 20% corresponds to a second level VGL of -7V. The display driver 30 can obtain the second level VGL corresponding to the brightness attenuation level according to the brightness potential relationship table, thereby increasing the absolute value of the second level VGL.

[0058] Negative bias temperature stress (NBTS) refers to the phenomenon where the threshold voltage of a transistor drifts under the combined effects of negative bias and temperature. Negative bias refers to a negative voltage between the gate and the source. Applying a more negative gate voltage (i.e., a lower second-level voltage VGL) causes the transistor's threshold voltage to drift in the negative direction, which affects the transistor's conduction characteristics.

[0059] The second level VGL is the turn-off level (negative value) of the gate drive signal connected to the switching module. When the second level VGL becomes more negative, the negative bias voltage intensity borne by the threshold compensation module 110 during the turn-off phase increases, causing its threshold voltage to drift further negatively.

[0060] During the data writing and threshold compensation phase, the gate drive signal of the threshold compensation module 110 switches to a high level (first level). Because the threshold voltage Vth of the threshold compensation module 110 becomes more negative due to the NBTS effect, its overdrive voltage (Vgs-Vth) increases significantly. Here, Vgs represents the gate-source voltage of the threshold compensation module. For example, if the original threshold voltage Vth = -2V, increasing the negative bias may change it to Vth = -3V. Under the same high-level drive signal, Vgs-Vth = 5V - (-3V) = 8V (assuming Vgs is 5V), which is larger than the original value 5V - (-2V) = 7V. According to the MOSFET on-current formula I... D ∝(V gs -V th ) 2 A higher overdrive voltage increases the conduction current of the threshold compensation module. The increased conduction current of the threshold compensation module 110 means that more charge is injected into the gate of the driving transistor DTFT, increasing its gate voltage. This can counteract the threshold voltage drift of the driving transistor DTFT caused by long-term use, thereby avoiding a decrease in driving current during the light emission stage, solving the color shift problem during brightness decay, and improving the display effect.

[0061] The display device provided in this invention includes a pixel circuit, a gate driving circuit, and a display driver. When the brightness decay of the display device exceeds a set threshold, the display driver controls the gate driving circuit to increase the absolute value of the second level in the output gate driving signal, thereby enhancing the NBTS effect of the threshold compensation module. The threshold compensation module is responsible for compensating for threshold voltage changes in the driving module during the data writing and threshold compensation phases. If the threshold voltage of the threshold compensation module becomes more negative due to the NBTS effect, the conduction current when the threshold compensation module is turned on will increase under the same high-level driving signal. The increased conduction current allows more charge to be injected into the gate of the driving transistor, increasing its gate voltage. This can offset the threshold voltage drift of the driving transistor caused by long-term use, thereby preventing a decrease in driving current during the light-emitting phase, solving the color shift problem during brightness decay, and improving the display effect.

[0062] Figure 4 This is a schematic diagram of the structure of another display device provided in an embodiment of the present invention. For example... Figure 4 As shown, optionally, the display driver 30 includes a level control signal generation module 310 and a power supply module 320.

[0063] The level control signal generation module 310 is used to output a level control signal CTR according to the degree of brightness attenuation when the brightness attenuation is greater than a set threshold.

[0064] The power supply module 320 is connected to the level control signal generation module 310 and the gate drive circuit 20. The power supply module 320 is used to increase the absolute value of the second level VGL output to the gate drive circuit 20 according to the level control signal CTR. The gate drive circuit 20 is used to generate a gate drive signal according to the second level VGL.

[0065] Specifically, the level control signal generation module 310 monitors the brightness decay of the display panel. When the brightness decay exceeds a set threshold, it generates a corresponding level control signal CTR. After receiving the level control signal CTR, the power supply module 320 dynamically adjusts the second level VGL output to the gate drive circuit 20, for example, adjusting it from -5V to -7V to enhance the negative bias. The gate drive circuit 20 uses the adjusted second level VGL to generate a gate drive signal, controlling the on / off state of the functional modules in the pixel circuit 10.

[0066] The level control signal generation module 310 stores a brightness-time decay relationship table and converts the cumulative screen-on duration signal into the corresponding brightness decay level according to the table. The cumulative screen-on duration signal is derived from the cumulative screen-on duration; for example, as the cumulative screen-on duration increases, the number of pulses in the cumulative screen-on duration signal also increases. The cumulative screen-on duration is the cumulative duration during which the display panel or pixel circuit 10 is lit. When the level control signal generation module 310 determines that the brightness decay level is greater than a set threshold, i.e., when the number of pulses in the cumulative screen-on duration signal reaches a certain amount, it indicates that the cumulative screen-on duration has reached the corresponding stage. In this stage, a level control signal CTR with the corresponding number of pulses is output. For example, when the brightness decay level is 10%, the output level control signal CTR includes 10 pulses; when the brightness decay level is 20%, the output level control signal CTR includes 20 pulses. The number of pulses has a linear or non-linear proportional relationship with the brightness decay level.

[0067] As the power-on time of the display panel increases, the brightness decay will successively enter different stages, such as the first stage, the second stage, the third stage, etc., where the brightness decay level represented by the first, second, and third stages increases sequentially. Correspondingly, the level control signal CTR has a first number of pulses n1, a second number of pulses n2, and a third number of pulses n3 in the first, second, and third stages, respectively, where the first number of pulses n1, the second number of pulses n2, and the third number of pulses n3 increase sequentially.

[0068] The power module 320 integrates a DC-DC conversion circuit. Through a feedback loop or lookup table, it increases the absolute value (more negative) of the second level VGL based on the level control signal CTR. Optionally, it can call a brightness potential relationship table based on the level control signal and increase the absolute value of the second level VGL output to the gate drive circuit according to the table. The brightness potential relationship table is a mapping table between the brightness attenuation level and the second level VGL. The level control signal is a pulse signal with a corresponding number of pulses. The pulse signal is a periodic square wave with a fixed pulse width (e.g., 1ms) and a fixed pulse interval (e.g., 1ms). The power module 320 can have a built-in counter to accumulate the number n of pulses received from the level control signal in real time. Different numbers of pulses correspond to different brightness attenuation levels. The corresponding second level VGL is obtained by looking up the brightness potential relationship table based on the current brightness attenuation level.

[0069] Figure 5 This is a schematic diagram of the structure of another display device provided in an embodiment of the present invention. For example... Figure 5As shown, optionally, the level control signal generation module 310 includes: a brightness time conversion unit 301, a brightness attenuation degree determination unit 302, and a logic control unit 303.

[0070] The brightness time conversion unit 301 receives the cumulative screen usage duration signal Cout and determines the real-time brightness of the display device based on the cumulative screen usage duration signal Cout.

[0071] The brightness attenuation degree determination unit 302 is connected to the brightness time conversion unit 301. The brightness attenuation degree determination unit 302 is used to determine the brightness attenuation degree based on the initial brightness, real-time brightness and cumulative screen-on time of the display device.

[0072] The logic control unit 303 is connected to the brightness attenuation degree determination unit 302. The logic control unit 303 is used to output a level control signal CTR with a corresponding number of pulses according to the brightness attenuation degree when the brightness attenuation degree of the display device is greater than a set threshold.

[0073] Specifically, the brightness-time conversion unit 301 stores a brightness-time decay relationship table between brightness and cumulative screen-on duration. The brightness-time conversion unit 301 can first obtain the cumulative screen-on duration of the display panel, and then obtain the real-time brightness corresponding to the cumulative screen-on duration according to the brightness-time decay relationship table.

[0074] The brightness attenuation determination unit 302 determines the brightness attenuation level of the display panel based on the initial brightness, real-time brightness, and cumulative screen-on time. Cumulative screen-on time refers to the total usage time of the display device. A built-in timer in the display driver 30 records the power-on time of the display panel (i.e., the cumulative screen-on time).

[0075] When the brightness attenuation exceeds a set threshold (e.g., 10%), the logic control unit 303 generates a level control signal CTR with a corresponding number of pulses based on the brightness attenuation level (e.g., the level control signal corresponding to a brightness attenuation level of 15% includes 15 pulses). The level control signal CTR is then sent to the power module 320 via a digital interface.

[0076] Continue to refer to Figure 2 Optionally, the pixel circuit 10 further includes a driving module 120 and a first initialization module 130.

[0077] The first initialization module 130 is connected between the first initialization signal line and the control terminal of the drive module 120. The first initialization module 130 is used to write the first initialization voltage Vref1 provided by the first initialization signal line to the control terminal of the drive module 120 according to the first gate drive signal S1. The high potential of the first gate drive signal S1 is the first level, and the low potential of the first gate drive signal S1 is the second level VGL.

[0078] The first terminal of the threshold compensation module 110 is connected to the first terminal of the drive module 120, and the second terminal of the threshold compensation module 110 is connected to the control terminal of the drive module 120. The threshold compensation module 110 is used to perform threshold compensation on the drive module 120 according to the second gate drive signal S2. The high potential of the second gate drive signal S2 is the first level, and the low potential of the second gate drive signal S2 is the second level VGL.

[0079] Optionally, the pixel circuit further includes a data writing module 140; the data writing module 140 is connected between the data line and the second end of the driving module 120, and the data writing module 140 is used to transmit the data voltage Vdata on the data line to the second end of the driving module 120 according to the third gate driving signal S3; the high potential of the third gate driving signal S3 is the first level, and the low potential of the third gate driving signal S3 is the second level VGL.

[0080] Optionally, the pixel circuit further includes a light-emitting module 150 and a light-emitting control module 160. The light-emitting control module 160, the driving module 120, and the light-emitting module 150 are connected between the first power supply ELVDD and the second power supply ELVSS. The light-emitting control module 160 is used to control the light-emitting module 150 to emit light according to the driving current output by the driving module 120 based on the light-emitting control signal EM.

[0081] Optionally, the light-emitting control module 160 includes a first light-emitting control module 1601 and a second light-emitting control module 1602. The first light-emitting control module 1601 is connected between the first power supply ELVDD and the second terminal of the driver module 120, and the second light-emitting control module 1602 is connected between the first terminal of the driver module 120 and the first terminal of the light-emitting module 150. The second terminal of the light-emitting module 150 is connected to the second power supply ELVSS, and the control terminals of the first light-emitting control module 1601 and the second light-emitting control module 1602 are connected to the light-emitting control signal EM.

[0082] Optionally, the pixel circuit also includes a storage module 170, which is connected between the first power supply ELVDD and the control terminal of the drive module 120. The storage module 170 is used to store the voltage of the control terminal of the drive module 120.

[0083] Optionally, the pixel circuit further includes a second initialization module 180, which is connected between the second initialization signal line and the first terminal of the light-emitting module 150. The second initialization module 180 is used to write the second initialization voltage Vref2 provided by the second initialization signal line to the first terminal of the light-emitting module 150 according to the fourth gate drive signal S4. The high potential of the fourth gate drive signal S4 is the first level, and the low potential of the fourth gate drive signal S4 is the second level VGL.

[0084] Figure 6 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention. For example... Figure 6 As shown, optionally, the threshold compensation module 110 includes a first transistor T1. The first terminal of the first transistor T1 serves as the first terminal of the threshold compensation module 110, the second terminal of the first transistor T1 serves as the second terminal of the threshold compensation module 110, and the gate of the first transistor T1 serves as the control terminal of the threshold compensation module 110. Optionally, the first transistor T1 is an indium gallium zinc oxide (IGZO) transistor. IGZO transistors have extremely low leakage current in the off state, which can reduce static power consumption and improve the energy efficiency of the display panel.

[0085] Optionally, the first initialization module 130 includes a second transistor T2. The gate of the second transistor T2 is connected to a first gate drive signal S1, the first terminal of the second transistor T2 is connected to the first initialization signal line, and the second terminal of the second transistor T2 is connected to the control terminal of the drive module 120. The second transistor T2 is an indium gallium zinc oxide transistor. This configuration can further reduce leakage current.

[0086] Optionally, the data writing module 140 includes a third transistor T3, the gate of which is connected to a third gate drive signal S3, the first terminal of which is connected to a data line, and the second terminal of which is connected to the second terminal of the drive module 120. Optionally, the third transistor T3 is a PMOS transistor.

[0087] Optionally, the first light-emitting control module 1601 includes a fourth transistor T4, and the second light-emitting control module 1602 includes a fifth transistor T5. The first terminal of the fourth transistor T4 is connected to the first power supply ELVDD, the second terminal of the fourth transistor T4 is connected to the second terminal of the driving module 120, and the gate of the fourth transistor T4 is connected to the light-emitting control signal line. The first terminal of the fifth transistor T5 is connected to the first terminal of the driving module 120, the second terminal of the fifth transistor T5 is connected to the first terminal of the light-emitting module 150, and the gate of the fifth transistor T5 is connected to the light-emitting control signal line. Optionally, both the fourth transistor T4 and the fifth transistor T5 are PMOS transistors.

[0088] Optionally, the storage module 170 includes a storage capacitor Cst, the first end of which is connected to a first power supply ELVDD, and the second end of which is connected to the control terminal of the drive module 120.

[0089] Optionally, the second initialization module 180 includes a sixth transistor T6. The gate of the sixth transistor T6 is connected to a fourth gate drive signal S4, the first terminal of the sixth transistor T6 is connected to a second initialization signal line, and the second terminal of the sixth transistor T6 is connected to a first terminal of the light-emitting module 150. Optionally, the sixth transistor T6 is a PMOS transistor.

[0090] Optionally, the driving module 120 includes a driving transistor DTFT, the gate of the driving transistor DTFT serving as the control terminal of the driving module 120, the first electrode of the driving transistor DTFT serving as the first terminal of the driving module 120, and the second electrode of the driving transistor DTFT serving as the second terminal of the driving module 120.

[0091] Optionally, the light-emitting module 150 includes a light-emitting element D1, with a first end of the light-emitting element D1 serving as the first end of the light-emitting module 150 and a second end of the light-emitting element D1 serving as the second end of the light-emitting module 150.

[0092] In this configuration, the first electrode is one of the source and the drain, and the second electrode is the other of the source and the drain. For example, if the first electrode is the source, the second electrode is the drain; or if the first electrode is the drain, the second electrode is the source.

[0093] Figure 7 This is a driving timing diagram of a pixel circuit provided in an embodiment of the present invention. Figure 7 The driving timing shown can be applied to the driver. Figure 2 and Figure 6 The pixel circuit shown is working. The following will combine... Figure 6 and Figure 7 The working principle of the pixel circuit provided in the embodiments of the present invention will be explained. Exemplarily, the operation of the pixel circuit within a display frame includes at least an initialization phase P1, a data writing and threshold compensation phase P2, and a light emission phase P3. After the (n-1)th display frame ends, the nth display frame begins. n is an integer greater than or equal to 2.

[0094] During the initialization phase P1 of the nth display frame, the first gate drive signal S1 is high, the second gate drive signal S2 is low, and the third gate drive signal S3, the fourth gate drive signal S4, and the light emission control signal EM are high. The first initialization module 130 is turned on, while the second initialization module 180, the data writing module 140, the first light emission control module 1601, the second light emission control module 1602, and the threshold compensation module 110 are turned off. That is, the second transistor T2 is turned on, while the sixth transistor T6, the third transistor T3, the fourth transistor T4, the fifth transistor T5, and the first transistor T1 are turned off. The first initialization voltage Vref1 transmitted by the first initialization signal line is written to the gate of the driving transistor DTFT through the second transistor T2, resetting the gate voltage of the driving transistor DTFT to the first initialization voltage Vref1 and controlling the driving transistor DTFT to turn on.

[0095] During the data writing and threshold compensation stage P2 of the nth display frame, the first gate drive signal S1 is low, the second gate drive signal S2 is high, the third gate drive signal S3 and the fourth gate drive signal S4 are low, and the light emission control signal EM is high. The data writing module 140, the threshold compensation module 110, and the second initialization module 180 are turned on, while the first initialization module 130, the first light emission control module 1601, and the second light emission control module 1602 are turned off. That is, the third transistor T3, the first transistor T1, and the sixth transistor T6 are turned on, while the second transistor T2, the fourth transistor T4, and the fifth transistor T5 are turned off. The data voltage Vdata transmitted via the data line is sequentially written to the gate of the driving transistor DTFT through the third transistor T3, the driving transistor DTFT, and the first transistor T1, making the gate voltage of the driving transistor DTFT correlated with both the data voltage Vdata and the threshold voltage of the driving transistor DTFT. Simultaneously, the gate voltage of the driving transistor DTFT is stored through the storage capacitor Cst. The second initialization voltage Vref2 transmitted by the second initialization signal line is written to the first terminal (e.g., anode) of the light-emitting element D1 through the sixth transistor T6, eliminating residual charge from the previous frame.

[0096] During the light-emitting phase P3 of the nth display frame, the first gate drive signal S1 is low, the second gate drive signal S2 is low, the third gate drive signal S3 and the fourth gate drive signal S4 are high, and the light-emitting control signal EM is low. The driving module 120, the first light-emitting control module 1601, and the second light-emitting control module 1602 are turned on, while the data writing module 140, the first initialization module 130, the second initialization module 180, and the threshold compensation module 110 are turned off. That is, the fourth transistor T4, the fifth transistor T5, and the driving transistor DTFT are turned on, while the third transistor T3, the second transistor T2, the sixth transistor T6, and the first transistor T1 are turned off. The driving transistor DTFT generates a driving current based on its gate voltage, thereby driving the light-emitting element D1 to emit light at a corresponding brightness. During the light-emitting phase P3, since the gate voltage of the driving transistor DTFT is related to both the data voltage Vdata and the threshold voltage of the driving transistor DTFT, it helps to compensate for the influence of the threshold voltage of the driving transistor DTFT on the driving current, thereby improving the display uniformity during the light-emitting phase.

[0097] Based on the same inventive concept, embodiments of the present invention also provide a driving method for a display device, applicable to any display device provided in any embodiment of the present invention. Figure 8 This is a flowchart of a driving method for a display device provided in an embodiment of the present invention. Figure 8 As shown, the driving method of the display device includes:

[0098] S101. When the brightness decay of the display device exceeds a set threshold, the control gate drive circuit increases the absolute value of the second level in the output gate drive signal to enhance the negative bias temperature stress (NBTS) of the switching module. The second level is the level that turns off the switching module.

[0099] Specifically, please refer to Figure 1 , Figure 2 and Figure 3 The display driver 30 stores a brightness decay table relating brightness to cumulative screen time, which can be represented as follows: Figure 3 The curve shown can be obtained through experiments or simulations. The vertical axis (Lv) represents brightness, and the horizontal axis (T) represents cumulative screen-on time. Lv0 represents the initial brightness of the display panel; as the cumulative screen-on time increases, the brightness increases as shown... Figure 3 The brightness decays in the same way as the curve shown. The display driver 30 can first obtain the cumulative screen-on time of the display panel, then obtain the real-time brightness corresponding to the cumulative screen-on time according to the brightness time decay relationship table, and then determine the degree of brightness decay of the display panel according to the initial brightness, real-time brightness, and cumulative screen-on time. The cumulative screen-on time refers to the power-on time of the display device.

[0100] Optionally, the display driver 30 also stores a brightness potential relationship table between the brightness attenuation level and the second voltage level. As the brightness attenuation level gradually increases, the absolute value of the second voltage level gradually increases. For example, a brightness attenuation level of 10% corresponds to a second voltage level of -6V, and a brightness attenuation level of 20% corresponds to a second voltage level of -7V. The display driver 30 can obtain the second voltage level corresponding to the brightness attenuation level according to the brightness potential relationship table, thereby increasing the absolute value of the second voltage level.

[0101] During the data writing and threshold compensation phase, the gate drive signal of the threshold compensation module 110 switches to a high level (first level). Because the threshold voltage Vth of the threshold compensation module 110 becomes more negative due to the NBTS effect, its overdrive voltage (Vgs-Vth) increases significantly. Here, Vgs represents the gate-source voltage of the threshold compensation module. For example, if the original threshold voltage Vth = -2V, increasing the negative bias may change it to Vth = -3V. Under the same high-level drive signal, Vgs-Vth = 5V - (-3V) = 8V (assuming Vgs is 5V), which is larger than the original value 5V - (-2V) = 7V. According to the MOSFET on-current formula I... D ∝(V gs -V th ) 2 A higher overdrive voltage increases the conduction current of the threshold compensation module. The increased conduction current of the threshold compensation module 110 means that more charge is injected into the gate of the driving transistor DTFT, increasing its gate voltage. This can counteract the threshold voltage drift of the driving transistor DTFT caused by long-term use, thereby avoiding a decrease in driving current during the light emission stage, solving the color shift problem during brightness decay, and improving the display effect.

[0102] The driving method for a display device provided in this invention enhances the NBTS effect of the threshold compensation module by increasing the absolute value of the second level in the output gate driving signal when the brightness decay of the display device exceeds a set threshold. The threshold compensation module is responsible for compensating for threshold voltage changes in the driving module during the data writing and threshold compensation phases. If the threshold voltage of the threshold compensation module becomes more negative due to the NBTS effect, the conduction current when the threshold compensation module is turned on will increase under the same high-level driving signal. The increased conduction current allows more charge to be injected into the gate of the driving transistor, increasing its gate voltage. This can offset the threshold voltage drift of the driving transistor caused by long-term use, thereby preventing a decrease in driving current during the light-emitting phase, solving the color shift problem during brightness decay, and improving the display effect.

[0103] Figure 9 This is a flowchart of another driving method for a display device provided in an embodiment of the present invention. For example... Figure 9As shown, the driving method of the display device includes:

[0104] S201. When the brightness attenuation exceeds the set threshold, output a level control signal according to the brightness attenuation level.

[0105] Specifically, please refer to Figure 4 The level control signal generation module 310 stores a brightness time decay relationship table and converts the cumulative screen-on duration signal into the corresponding brightness decay level according to the brightness time decay relationship table. The cumulative screen-on duration signal is derived from the cumulative screen-on duration. For example, as the cumulative screen-on duration increases, the number of pulses in the cumulative screen-on duration signal also increases. The cumulative screen-on duration is the cumulative duration during which the display panel or pixel circuit 10 is lit. When the level control signal generation module 310 determines that the brightness decay level is greater than a set threshold, that is, when the number of pulses in the cumulative screen-on duration signal reaches a certain number, it indicates that the cumulative screen-on duration has reached the corresponding stage. In this stage, a level control signal CTR with the corresponding number of pulses is output. For example, when the brightness decay level is 10%, the corresponding output level control signal CTR includes 10 pulses; when the brightness decay level is 20%, the corresponding output level control signal CTR includes 20 pulses. The number of pulses has a linear or non-linear proportional relationship with the brightness decay level. This embodiment quantifies the brightness decay level into a transmittable pulse signal (i.e., a level control signal), simplifying the control logic.

[0106] S202. Increase the absolute value of the second level output to the gate drive circuit according to the level control signal.

[0107] Specifically, please refer to Figure 4 The power module 320 includes a DC-DC conversion circuit that, through a feedback loop or lookup table, increases the absolute value (making it more negative) of the second level based on the level control signal CTR. Optionally, it can call up a brightness potential relationship table based on the level control signal and increase the absolute value of the second level output to the gate drive circuit according to the brightness potential relationship table. The brightness potential relationship table is a mapping table between the degree of brightness attenuation and the second level. The lookup table method eliminates the need for real-time calculation, directly calling pre-stored data, thus reducing latency.

[0108] Figure 10 This is a flowchart of another driving method for a display device provided in an embodiment of the present invention. For example... Figure 10 As shown, the driving method of the display device includes:

[0109] S301. Determine the real-time brightness of the display device based on the cumulative screen duration signal.

[0110] Specifically, please refer to Figure 5The brightness-time conversion unit 301 stores a brightness-time decay relationship table between brightness and cumulative screen-on duration. The brightness-time conversion unit 301 can first obtain the cumulative screen-on duration of the display panel, and then obtain the real-time brightness corresponding to the cumulative screen-on duration according to the brightness-time decay relationship table.

[0111] S302. Determine the degree of brightness decay based on the initial brightness, real-time brightness, and cumulative screen-clicking duration of the display device.

[0112] Specifically, please refer to Figure 5 The brightness attenuation determination unit 302 determines the brightness attenuation level of the display panel based on the initial brightness, real-time brightness, and cumulative screen-on time. Cumulative screen-on time refers to the total usage time of the display device. A built-in timer in the display driver 30 records the power-on time of the display panel (i.e., the cumulative screen-on time).

[0113] S303. When the brightness attenuation of the display device is greater than a set threshold, output a level control signal with a corresponding number of pulses according to the brightness attenuation.

[0114] Specifically, please refer to Figure 5 When the brightness attenuation exceeds a set threshold (e.g., 10%), the logic control unit 303 generates a level control signal CTR with a corresponding number of pulses based on the brightness attenuation level (e.g., the level control signal corresponding to a brightness attenuation level of 15% includes 15 pulses). The level control signal CTR is then sent to the power module 320 via a digital interface.

[0115] S304. Increase the absolute value of the second level output to the gate drive circuit according to the level control signal.

[0116] It should be noted that the driving method of the display device provided in the embodiments of the present invention is the same as that of the display device. For the same reason, please refer to the corresponding explanation of the display device. The embodiments of the present invention will not be repeated here.

[0117] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0118] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A display device, characterized in that, include: Pixel circuit, gate drive circuit, and display driver; The gate driving circuit is connected to the switching module in the pixel circuit, and the gate driving circuit is used to output a gate driving signal to drive the switching module; the gate driving signal includes a first level and a second level, wherein the first level is greater than the second level; the switching module includes a threshold compensation module; The display driver is connected to the gate drive circuit and is used to control the gate drive circuit to increase the absolute value of the second level in the output gate drive signal when the brightness decay of the display device is greater than a set threshold, so as to enhance the negative bias temperature stress (NBTS) of the switching module. The second level is the level that turns off the switch module.

2. The display device according to claim 1, characterized in that, The display driver includes: a level control signal generation module and a power supply module; The level control signal generation module is used to output a level control signal according to the degree of brightness attenuation when the brightness attenuation is greater than the set threshold. The power supply module is connected to the level control signal generation module and the gate drive circuit. The power supply module is used to increase the absolute value of the second level output to the gate drive circuit according to the level control signal. The gate drive circuit is used to generate the gate drive signal according to the second level.

3. The display device according to claim 2, characterized in that, The display driver stores a brightness potential relationship table, which is a mapping relationship table between the brightness attenuation degree and the second level; The power module calls the brightness potential relationship table according to the level control signal, and increases the absolute value of the second level output to the gate drive circuit according to the brightness potential relationship table.

4. The display device according to claim 2, characterized in that, The level control signal generation module includes: a brightness time conversion unit, a brightness attenuation degree determination unit, and a logic control unit; The brightness-time conversion unit receives the cumulative screen-on duration signal, and the brightness-time conversion unit determines the real-time brightness of the display device based on the cumulative screen-on duration signal; The brightness attenuation degree determination unit is connected to the brightness time conversion unit, and the brightness attenuation degree determination unit is used to determine the brightness attenuation degree based on the initial brightness of the display device, the real-time brightness, and the cumulative screen-clicking time. The logic control unit is connected to the brightness attenuation degree determination unit. The logic control unit is used to output the level control signal with a corresponding number of pulses according to the brightness attenuation degree when the brightness attenuation degree of the display device is greater than a set threshold.

5. The display device according to claim 1, characterized in that, The pixel circuit also includes a driving module and a first initialization module; The first initialization module is connected between the first initialization signal line and the control terminal of the driving module. The first initialization module is used to write the first initialization voltage provided by the first initialization signal line to the control terminal of the driving module according to the first gate driving signal. The high potential of the first gate driving signal is the first level, and the low potential of the first gate driving signal is the second level. The first terminal of the threshold compensation module is connected to the first terminal of the driving module, and the second terminal of the threshold compensation module is connected to the control terminal of the driving module. The threshold compensation module is used to perform threshold compensation on the driving module according to the second gate driving signal; the high potential of the second gate driving signal is the first level, and the low potential of the second gate driving signal is the second level. Preferably, the threshold compensation module includes a first transistor; The first terminal of the first transistor serves as the first terminal of the threshold compensation module, the second terminal of the first transistor serves as the second terminal of the threshold compensation module, and the gate of the first transistor serves as the control terminal of the threshold compensation module. Preferably, the first transistor is an indium gallium zinc oxide transistor; Preferably, the first initialization module includes a second transistor; The gate of the second transistor is connected to the first gate drive signal, the first terminal of the second transistor is connected to the first initialization signal line, and the second terminal of the second transistor is connected to the control terminal of the drive module. The second transistor is an indium gallium zinc oxide transistor; Preferably, the pixel circuit further includes a data writing module; The data writing module is connected between the data line and the second end of the driving module. The data writing module is used to transmit the data voltage on the data line to the second end of the driving module according to the third gate driving signal. The high potential of the third gate driving signal is the first level, and the low potential of the third gate driving signal is the second level. Preferably, the data writing module includes a third transistor, the gate of the third transistor is connected to the third gate drive signal, the first terminal of the third transistor is connected to the data line, and the second terminal of the third transistor is connected to the second terminal of the drive module; Preferably, the third transistor is a PMOS transistor.

6. The display device according to claim 5, characterized in that, The pixel circuit also includes a light-emitting module and a light-emitting control module; The light-emitting control module, the driving module, and the light-emitting module are connected between the first power supply and the second power supply. The light-emitting control module is used to control the light-emitting module to emit light according to the driving current output by the driving module according to the light-emitting control signal. Preferably, the pixel circuit further includes a storage module, which is connected between the first power supply and the control terminal of the driving module, and is used to store the voltage of the control terminal of the driving module. Preferably, the storage module includes a storage capacitor, a first end of which is connected to the first power supply, and a second end of which is connected to the control terminal of the drive module. Preferably, the light-emitting control module includes a first light-emitting control module and a second light-emitting control module; The first light-emitting control module is connected between the first power supply and the second end of the driving module, the second light-emitting control module is connected between the first end of the driving module and the first end of the light-emitting module, the second end of the light-emitting module is connected to the second power supply, and the control terminals of the first light-emitting control module and the second light-emitting module are connected to the light-emitting control signal. Preferably, the first light-emitting control module includes a fourth transistor, and the second light-emitting control module includes a fifth transistor; The first terminal of the fourth transistor is connected to the first power supply, the second terminal of the fourth transistor is connected to the second terminal of the driving module, and the gate of the fourth transistor is connected to the light emission control signal line. The first terminal of the fifth transistor is connected to the first terminal of the driving module, the second terminal of the fifth transistor is connected to the first terminal of the light-emitting module, and the gate of the fifth transistor is connected to the light-emitting control signal line. Preferably, both the fourth transistor and the fifth transistor are PMOS transistors; Preferably, the pixel circuit further includes a second initialization module, which is connected between the second initialization signal line and the first end of the light-emitting module. The second initialization module is used to write a second initialization voltage provided by the second initialization signal line to the first end of the light-emitting module according to the fourth gate driving signal; the high potential of the fourth gate driving signal is the first level, and the low potential of the fourth gate driving signal is the second level. Preferably, the second initialization module includes a sixth transistor, the gate of the sixth transistor is connected to the fourth gate drive signal, the first terminal of the sixth transistor is connected to the second initialization signal line, and the second terminal of the sixth transistor is connected to the first terminal of the light-emitting module; Preferably, the sixth transistor is a PMOS transistor.

7. A driving method for a display device, characterized in that, The display device includes: a pixel circuit, a gate driving circuit, and a display driver; the gate driving circuit is connected to a switching module in the pixel circuit, and the gate driving circuit is used to output a gate driving signal to drive the switching module; the gate driving signal includes a first level and a second level, wherein the first level is greater than the second level; the switching module includes a threshold compensation module; the display driver is connected to the gate driving circuit; the driving method of the display device includes: When the brightness decay of the display device exceeds a set threshold, the gate drive circuit is controlled to increase the absolute value of the second level in the output gate drive signal to enhance the negative bias temperature stress (NBTS) of the switching module; the second level is the level that turns off the switching module.

8. The driving method for the display device according to claim 7, characterized in that, The step of controlling the gate drive circuit to increase the absolute value of the second level in the output gate drive signal to enhance the negative bias temperature stress (NBTS) of the switching module when the brightness decay of the display device is greater than a set threshold includes: When the brightness attenuation level is greater than the set threshold, a level control signal is output according to the brightness attenuation level; The absolute value of the second level output to the gate drive circuit is increased according to the level control signal.

9. The driving method for the display device according to claim 8, characterized in that, The step of increasing the absolute value of the second level output to the gate drive circuit according to the level control signal includes: The brightness potential relationship table is invoked according to the level control signal, and the absolute value of the second level output to the gate drive circuit is increased according to the brightness potential relationship table. The brightness potential relationship table is a mapping table between the brightness attenuation degree and the second level.

10. The driving method for the display device according to claim 8, characterized in that, The step of outputting a level control signal based on the brightness attenuation level when the brightness attenuation of the display device is greater than the set threshold includes: The real-time brightness of the display device is determined based on the cumulative screen tap duration signal; The degree of brightness decay is determined based on the initial brightness of the display device, the real-time brightness, and the cumulative screen-click duration. When the brightness attenuation of the display device exceeds a set threshold, a level control signal with a corresponding number of pulses is output according to the brightness attenuation level.

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