Driving method and device of display panel and display device

Abstract

The invention discloses a driving method and device of a display panel and a display device. The driving method of the display panel comprises the following steps: in a data writing stage, adjusting a change rate of a data signal and / or a voltage value of an analog power supply voltage signal, so that a power change amount of the analog power supply voltage signal is smaller than a preset power change amount when the data signal changes; and in a light emitting stage, driving the pixel unit to display based on the data signal according to the first gate control signal. When the data signal changes, the power change acting on the analog power supply voltage when the data signal changes can be reduced, so that the instantaneous large current of the analog power supply voltage signal can be reduced, the probability of damage of the driving circuit and signal interference is reduced, and the reliability of the display panel is improved. When the analog power supply voltage is provided by the power supply chip, the probability of replacing the power supply chip can be reduced, and meanwhile, the improvement probability of process equipment is reduced.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular, to a method and device for driving a display panel, and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display panel has many advantages such as self-luminescence and high contrast, and is a display panel with broad application prospects.

[0003] The display panel has a driver chip and a driver circuit. The driver chip includes a data driver, which is used to provide data voltage to the pixel circuit in the driver circuit. When the data driver is working, the analog power supply voltage signal of the driver chip will generate instantaneous large current, which can easily cause damage to the driver circuit and signal interference, reducing the reliability of the display panel. Summary of the invention

[0004] The present invention provides a display panel driving method and device, and a display device, so as to reduce the instantaneous large current of the analog power supply voltage and improve the reliability of the display panel.

[0005] In a first aspect, an embodiment of the present invention provides a method for driving a display panel, wherein the display panel includes a pixel unit, and the method for driving the display panel includes:

[0006] During the data writing phase, adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal so that the power change amount of the analog power supply voltage signal when the data signal changes is less than a preset power change amount;

[0007] In the light emitting stage, the pixel unit is driven to display based on the data signal according to the first gate control signal.

[0008] Optionally, in the data writing stage, adjusting the power change amount of the analog power supply voltage signal when the data signal changes to be less than a preset power change amount according to the change rate of the data signal and / or the voltage value of the analog power supply voltage signal, comprises:

[0009] In the first data writing phase, adjusting the analog power supply voltage to a first voltage; wherein the first voltage is less than a preset voltage of the analog power supply voltage;

[0010] In the second data writing phase, a data signal is written into the pixel unit; wherein the data signal is a data voltage of a current frame, and the start time of the first data writing phase at least does not lag behind the start time of the second data writing phase.

[0011] Optionally, before the second data writing stage, the method further includes:

[0012] The data signal is controlled to be in a high impedance state.

[0013] Optionally, the difference between the first voltage and the preset voltage ranges from 0.3V to 0.5V.

[0014] Optionally, writing a data signal into a pixel unit comprises:

[0015] The data signal is charged multiple times to become the data voltage of the current frame, and written into the pixel unit; the voltage after each charging is greater than the voltage after the previous charging;

[0016] Preferably, charging the data signal multiple times to the data voltage of the current frame comprises:

[0017] The data signal is charged stepwise to become the data voltage of the current frame.

[0018] Optionally, after writing the data signal into the pixel unit, the method further includes:

[0019] Transmitting a data signal to a data input terminal of the pixel unit;

[0020] The second gate control signal is controlled to be effective, so that the data signal is transmitted to the gate of the driving transistor of the pixel unit through the data input terminal, and the effective level of the second gate control signal is ahead of the effective level of the first gate control signal.

[0021] Optionally, adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal so that the power change amount of the analog power supply voltage signal is less than a preset power change amount when the data signal changes includes:

[0022] Charging the data signal to the pixel unit multiple times; the voltage after each charging is greater than the voltage after the last charging;

[0023] Preferably, charging the data signal to the pixel unit multiple times comprises: charging the data signal to the pixel unit in a step-by-step manner.

[0024] Optionally, the pixel unit includes a pixel circuit and a light emitting unit; and driving the pixel unit to display based on the data signal according to the first gate control signal includes:

[0025] In the light emitting stage, the first gate control signal is controlled to be effective, so that the pixel circuit forms a driving current according to the data signal to drive the light emitting unit to display.

[0026] In a second aspect, an embodiment of the present invention further provides a driving device for a display panel, wherein the display panel includes a pixel unit, and the driving device for the display panel includes:

[0027] An adjustment module, used for adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal during the data writing phase, so that the power change amount of the analog power supply voltage signal is less than a preset power change amount when the data signal changes;

[0028] The driving module is used to drive the pixel unit to display based on the data signal according to the first gate control signal during the light emitting stage.

[0029] In a third aspect, an embodiment of the present invention further provides a display device, comprising a display panel and a driving device for the display panel as described in the second aspect; the display panel is connected to the driving device for the display panel, and the driving device for the display panel is used to drive the display panel to display.

[0030] The technical solution of the embodiment of the present invention reduces the instantaneous large current of the analog power supply voltage, reduces the probability of damage to the drive circuit and signal interference, and improves the reliability of the display panel. When the analog power supply voltage is provided by a power chip, the probability of replacing the power chip can be reduced, and the probability of improving the process equipment is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A timing simulation diagram of different signals of a driver chip provided for related technologies;

[0032] Figure 2 A schematic diagram of the structure of a driver chip provided by an embodiment of the present invention;

[0033] Figure 3 A schematic flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of timing simulation of different signals of a driver chip provided by an embodiment of the present invention;

[0035] Figure 5 A circuit diagram of a pixel unit provided by an embodiment of the present invention;

[0036] Figure 6 A schematic diagram of timing simulation of different signals of another driver chip provided by an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of timing simulation of different signals of another driver chip provided by an embodiment of the present invention;

[0038] Figure 8A schematic structural diagram of a driving device for a display panel provided by an embodiment of the present invention;

[0039] Fig. 9 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0041] The display panel includes a driving chip and a driving circuit. The driving chip may include a data driver; the data driver is connected to the pixel circuit in the driving circuit, and is used to provide a driving signal for the pixel circuit. The driving chip also includes a power module, which is used to form the analog voltage required by the pixel circuit and the gate driving circuit in the driving circuit according to the analog power supply voltage signal. Among them, the analog power supply voltage signal can be provided by a power supply IC, and can also be provided by a motherboard connected to the display panel. In the process of driving the chip, at the moment when the data driver is powered on, due to external reasons of the driving chip, the analog power supply voltage signal will generate an instantaneous large current, which can easily cause damage to the pixel circuit and the gate driving circuit and signal interference, thereby reducing the reliability of the display panel. Among them, the external reasons of the driving chip may include electrostatic interference, and may also include structural differences in the driving chip itself. Exemplarily, Figure 1 A timing simulation diagram of different signals of a driver chip provided for related technologies. Among them, AVDD currut is the current timing of the simulated power supply voltage signal, Source is the timing of the data voltage provided by the data driver, TE is the timing of the frame synchronization signal provided by the driver chip, and MIPI is the timing of the data transmission signal provided by the driver chip. Figure 1 As shown, at the moment when the data voltage changes, the current of the analog power supply voltage signal has an instantaneous large current, with a peak value reaching 299.4 mA, which can easily cause damage to the pixel circuit and the gate drive circuit and signal interference, reducing the reliability of the display panel.

[0042] In view of the above technical problems, an embodiment of the present invention provides a display panel driving method for driving the display panel to display. The display panel may include a driving chip, a gate driving circuit and a pixel unit, wherein the driving chip is connected to the gate driving circuit and the pixel unit, and is used to generate an analog voltage according to an analog power supply voltage signal to provide power to the gate driving circuit and the pixel unit. For example, Figure 2 FIG. 1 is a schematic diagram of the structure of a driver chip provided by an embodiment of the present invention. Figure 2As shown, the driving chip may include a power module 10 and a gamma module 20. The power module 10 converts the analog power supply voltage signal AVDD into the maximum value of the gamma voltage and outputs it to the gamma module 20, so that the gamma module 20 limits the range of the data voltage according to the maximum value of the gamma voltage. Among them, the maximum value of the gamma voltage includes the lowest gamma voltage VGSP and the highest gamma voltage VGMP. When the driving transistor in the pixel unit is a P-type transistor, the lowest gamma voltage VGSP corresponds to the maximum brightness of the display panel, and the highest gamma voltage VGMP corresponds to the lowest brightness of the display panel. The power module 10 can also convert the analog power supply voltage signal AVDD into a reference voltage VREF of the pixel unit and a power supply voltage of the gate drive circuit to drive the pixel unit and the gate drive circuit to work. Among them, the power supply voltage of the gate drive circuit may include a positive power supply voltage VGH and a negative power supply voltage VGL. The driver chip may also include a data processing module 30 (which may include a gate driver and a data driver, etc.), which is used to form a start signal and a clock signal of the gate drive circuit according to the data transmission signal provided by the mainboard and the gamma value provided by the gamma module 20, and output to the gate drive circuit, so that the gate drive circuit generates a gate control signal according to the start signal and the clock signal, and outputs it to the pixel unit. Wherein, when the gate drive circuit includes a scanning circuit and a light emitting control circuit, the start signal of the gate drive circuit includes a start signal SIN of the scanning circuit and a start signal EIN of the light emitting control circuit. The clock signal of the gate drive circuit includes a clock signal SCK of the scanning circuit (which may include at least two) and a clock signal ECK of the light emitting control circuit (which may include at least two). Moreover, the data processing module 30 can form a data voltage data of the pixel unit, so that the pixel unit is displayed according to the gate control signal and the data voltage data.

[0043] The display panel driving method provided in the embodiment of the present invention can be executed by a display panel driving device, and the display panel driving device can be integrated into a display panel driving chip. The display panel driving method includes:

[0044] In the data writing stage, adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal so that the power change amount of the analog power supply voltage signal when the data signal changes is less than the preset power change amount;

[0045] Specifically, the rate of change of the data signal is the speed at which the initial voltage changes to the target voltage during the data signal change process. In the data writing stage, the data signal jumps from the current voltage value to the data voltage of the current frame. By increasing the time required for the data signal to jump from the current voltage value to the data voltage of the current frame, the rate of change of the data signal can be reduced, thereby reducing the instantaneous impact during the data voltage change process, and then reducing the power change of the analog power supply voltage signal, so that the power change of the analog power supply voltage signal is less than the preset power change, reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel. In the data writing stage, the voltage value of the analog power supply voltage signal can also be adjusted so that the voltage value of the analog power supply voltage signal is less than the preset voltage value, which can reduce the voltage value of the analog voltage inside the driver chip, and also reduce the power change acting on the analog power supply voltage when the data signal changes, thereby reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel. When the analog power supply voltage is provided by a power chip, the probability of replacing the power chip can be reduced, while reducing the probability of improving the process equipment. Among them, when the power supply IC provides an analog power supply voltage signal, the power of the analog power supply voltage signal is the product of the voltage of the analog power supply voltage signal and the current acting on the power supply IC when the data signal is output. The power change of the analog power supply voltage signal is the change in the power of the analog power supply voltage signal before and after the change when the data signal changes according to the adjusted change rate at the current voltage value of the analog power supply voltage signal. The preset power change is the change in the power of the analog power supply voltage signal before and after the change when the voltage of the analog power supply voltage signal is the preset analog voltage and the data signal changes according to the change rate before adjustment. Exemplarily, the change rate of the data signal before adjustment is the change rate of the data signal from the current voltage to the data voltage of the current frame, for example, Figure 1 As shown, the data voltage directly jumps from the high impedance state to the data voltage of the current frame.

[0046] In the light emitting stage, the pixel unit is driven to display based on the data signal according to the first gate control signal.

[0047] Specifically, when the data signal is written into the pixel unit, the data processing module of the driving chip can form a start signal and a clock signal of the gate driving circuit according to the data transmission signal and the gamma value provided by the gamma module, and output them to the gate driving circuit, so that the gate driving circuit generates a first gate control signal according to the start signal and the clock signal, and outputs it to the pixel unit. The pixel unit writes the data signal into the gate of the driving transistor in the pixel unit according to the first gate control signal, so that the driving transistor can form a driving current according to the data signal, and drive the light-emitting device in the pixel unit to display.

[0048] The technical solution of this embodiment adjusts the change rate of the data signal and / or the voltage value of the analog power supply voltage signal during the data writing stage so that the power change of the analog power supply voltage signal is less than the preset power change when the data signal changes, thereby reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel. When the analog power supply voltage is provided by the power chip, the probability of replacing the power chip can be reduced, and the probability of improving the process equipment is also reduced.

[0049] Figure 3 A schematic diagram of a method for driving a display panel provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the driving method of the display panel includes:

[0050] S110, in a first data writing phase, adjusting the analog power supply voltage to a first voltage; wherein the first voltage is less than a preset voltage of the analog power supply voltage;

[0051] Among them, the analog power supply voltage can be a voltage provided by a power chip or a mainboard to a driver chip of a display panel, and is used to provide an analog power supply for a power module of the driver chip. The data writing stage can be divided into a continuous first data writing stage and a second data writing stage, and at least part of the first data writing stage is located before the second data writing stage. In the first data writing stage, the power module of the driver chip is actuated so that the power module can form a first voltage according to the analog power supply voltage, and the first voltage is less than a preset voltage of the analog power supply voltage, so that the voltage value of the analog voltage inside the driver chip can be reduced. Exemplarily, the first voltage can be the highest gamma voltage of the gamma module. The highest gamma voltage is less than the analog power supply voltage, so that the analog voltage value inside the driver chip is reduced.

[0052] S120, writing a data signal into a pixel unit in a second data writing phase; wherein the data signal is a data voltage of a current frame, and a start time of the first data writing phase at least does not lag behind a start time of the second data writing phase;

[0053] Among them, after the analog power supply voltage is adjusted to the first voltage, the analog voltage in the driver chip is reduced. In the second data writing stage, the data processing module of the driver chip forms the data voltage of the current frame according to the data transmission signal, and outputs it to the pixel unit, so that the pixel unit can display the picture of the current frame according to the data voltage of the current frame. Because the analog voltage is reduced before the data processing module forms the data signal according to the data transmission signal, the power change acting on the analog power supply voltage when the data signal changes can be reduced, and then the instantaneous large current of the analog power supply voltage can be reduced, which reduces the probability of damage to the drive circuit and signal interference, and improves the reliability of the display panel. When the analog power supply voltage is provided by the power chip, the probability of replacing the power chip can be reduced, and the probability of improving the process equipment is reduced.

[0054] For example, Figure 4 A schematic diagram of timing simulation of different signals of a driver chip provided by an embodiment of the present invention. Among them, AVDD currut is the current timing of the analog power supply voltage signal, Source is the timing of the data signal provided by the data driver, AVDD is the timing of the analog power supply voltage signal, and MIPI is the timing of the data transmission signal provided by the driver chip. Figure 4 As shown, in the first data writing stage, the analog power supply voltage jumps to the first voltage, and then the data driver provides the data signal of the current frame, so that the current of the analog power supply voltage signal drops from 299.4mA to 153.1mA at the instantaneous peak value of the data voltage change, thereby reducing the instantaneous large current of the analog power supply voltage signal, reducing the probability of damage to the driving circuit and signal interference, and improving the reliability of the display panel. Figure 5 A circuit diagram of a pixel unit provided by an embodiment of the present invention is shown in FIG. Figure 5As shown, the pixel unit includes 8T1C, the first transistor T1 is a driving transistor, the fourth transistor T4, the seventh transistor T7 and the eighth transistor T8 are initialization transistors, and the pixel unit includes an initialization phase. In the initialization phase, the first N-type scanning signal SN1 output by the scanning circuit is high, the fourth transistor T4 is turned on, the second P-type scanning signal SP2 output by the scanning circuit is low, the seventh transistor T7 and the eighth transistor T8 are turned on, and different initialization signals are respectively initialized through the fourth transistor T4, the seventh transistor T7 and the eighth transistor T8 to the gate of the driving transistor T1, the anode A of the light-emitting device and the source S of the driving transistor T1. The second data writing phase may include the data writing phase of the pixel unit. In the data writing phase, the first P-type scanning signal SP1 output by the scanning circuit is low, which can control the second transistor T2 to be turned on. At the same time, the second N-type scanning signal SN2 output by the scanning circuit is high, and the third transistor T3 is turned on. The data signal is written into the gate of the driving transistor T1 through the second transistor T2, the driving transistor T1 and the third transistor T3, and is maintained by the storage capacitor Cst.

[0055] S130 , in the light emitting stage, driving the pixel unit to display based on the data signal according to the first gate control signal.

[0056] When the data signal is written into the pixel unit, the data processing module of the driver chip can form a start signal and a clock signal of the gate drive circuit according to the data transmission signal and the gamma value provided by the gamma module, and output them to the gate drive circuit, so that the gate drive circuit generates a first gate control signal according to the start signal and the clock signal, and outputs it to the pixel unit. The pixel unit writes the data signal into the gate of the driving transistor in the pixel unit according to the first gate control signal, so that the driving transistor can form a driving current according to the data signal to drive the light-emitting device in the pixel unit to display. Continue to refer to Figure 5 , the light-emitting stage may include the light-emitting stage of the pixel unit. The first gate control signal may include a light-emitting control signal EM. In the light-emitting stage, the light-emitting control signal EM output by the light-emitting control circuit is at a low level, the fifth transistor T5 and the sixth transistor T6 are turned on, the driving transistor T1 forms a driving current according to the gate data signal and the first power signal ELVDD, and drives the light-emitting device to emit light according to the current data signal. Among them, the cathode of the light-emitting device inputs the second power signal ELVSS.

[0057] The technical solution of this embodiment adjusts the analog power supply voltage to the first voltage before the second data writing stage, so that the analog voltage in the driver chip is reduced. When the data signal changes, the power change acting on the analog power supply voltage when the data signal changes can be reduced, and then the instantaneous large current of the analog power supply voltage signal can be reduced, thereby reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel. When the analog power supply voltage is provided by the power chip, the probability of replacing the power chip can be reduced, and the probability of improving the process equipment is reduced.

[0058] In some embodiments, before the second data writing phase, the method further includes:

[0059] The control data signal is in high impedance state.

[0060] Specifically, before the second data writing phase, the data signal can be in a high impedance state to prevent the data signal from being transmitted to the pixel unit, thereby preventing the data signal from changing before the analog power supply voltage is adjusted to the first voltage, ensuring that the instantaneous large current of the analog power supply voltage is reduced, and further improving the reliability of the display panel. Figure 4 Before the second data writing phase, the data signal Source is in a high impedance state, and the output level is a low level signal.

[0061] In some embodiments, the difference between the first voltage and the preset voltage is in the range of 0.3V-0.5V, so that when the voltage value of the analog voltage is converted into other voltages, the voltage value of the other voltage can be guaranteed to meet the requirements of the pixel unit and the gate drive circuit. Exemplarily, the other voltage may include a reference voltage of the pixel unit and a power supply voltage of the gate drive circuit.

[0062] In some embodiments, writing a data signal into a pixel unit includes:

[0063] The data signal is charged multiple times to become the data voltage of the current frame and written into the pixel unit; the voltage after each charging is greater than the voltage after the previous charging.

[0064] Specifically, before the data signal changes, the data signal can be in a high impedance state. After the data signal changes, the data signal changes to the data voltage of the current frame according to the data transmission signal. Then the voltage of the data signal changes to the data voltage of the current frame minus the low-level voltage corresponding to the high impedance state. During the voltage change process of the data signal, the data signal can be controlled to be charged from the high impedance state to the data voltage of the current frame multiple times, and the voltage after each charge is greater than the voltage after the last charge, so that the voltage of the data signal gradually changes to the data voltage of the current frame, thereby reducing the instantaneous impact during the data voltage change process, and then reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel.

[0065] In some embodiments, charging the data signal multiple times to a data voltage of a current frame includes:

[0066] The data signal is charged step by step to the data voltage of the current frame.

[0067] Specifically, the charging mode of the data signal can be step-charging, so that the data signal can jump from the high impedance state to the data voltage of the current frame in a step-by-step manner. Compared with the data voltage directly jumping from the low level voltage of the high impedance state to the data voltage of the current frame, the change rate of the data voltage can be reduced, thereby reducing the instantaneous impact during the data voltage jump process, and further reducing the instantaneous large current of the analog power supply voltage. Exemplary, Figure 6 Another timing simulation diagram of different signals of a driver chip provided by an embodiment of the present invention. Among them, AVDD currut is the current timing of the analog power supply voltage signal, Source is the timing of the data signal provided by the data driver, TE is the timing of the frame synchronization signal provided by the driver chip, and MIPI is the timing of the data transmission signal provided by the driver chip. Figure 6 As shown, during the data signal jump process, the data signal jumps from a high-impedance low-level voltage to the data voltage of the current frame in three steps, thereby reducing the instantaneous large current of the analog power supply voltage signal, reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel.

[0068] In some embodiments, writing a data signal into a pixel unit includes:

[0069] Transmitting the data signal to the data input terminal of the pixel unit;

[0070] For details, please refer to Figure 5, the data input end of the pixel unit is the first electrode of the second transistor T2. In the second data writing stage, the data processing module of the driving chip can form a data signal according to the data transmission signal and transmit it to the first electrode of the second transistor T2. At this time, the second transistor T2 is in the cut-off state, and the data signal cannot be transmitted to the gate of the driving transistor T1.

[0071] The second gate control signal is controlled to be effective, so that the data signal is transmitted to the gate of the driving transistor of the pixel unit through the data input terminal, and the effective level of the second gate control signal is ahead of the effective level of the first gate control signal.

[0072] Specifically, the second gate control signal may include a first P-type scan signal SP1 and a second N-type scan signal SN2. The effective level of the first P-type scan signal SP1 is a low level, and the effective level of the second N-type scan signal SN2 is a high level. After the data signal is transmitted to the first pole of the second transistor T2, the gate drive circuit controls the first P-type scan signal SP1 to be a low level and the second N-type scan signal SN2 to be a high level, so that the second transistor T2 and the third transistor T3 are turned on, so that the data signal can be written into the gate of the driving transistor T1 through the second transistor T2, the driving transistor T1 and the third transistor T3, thereby realizing the writing of the data signal. Therefore, the writing of the data signal into the pixel unit can be divided into a first process of writing the data signal into the data input end of the pixel unit, and a second process of writing the data signal from the data input end to the gate of the driving transistor, thereby reducing the instantaneous change of the data signal, thereby reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the driving circuit and signal interference, and improving the reliability of the display panel. When the analog power supply voltage is provided by a power supply chip, the probability of replacing the power supply chip can be reduced, and the probability of improving the process equipment can be reduced. Exemplary, Figure 7 Another timing simulation diagram of different signals of a driver chip provided by an embodiment of the present invention. Among them, AVDD currut is the current timing of the analog power supply voltage signal, Source is the timing of the data signal provided by the data driver, TE is the timing of the frame synchronization signal provided by the driver chip, and is used to characterize the second gate control signal. MIPI is the timing of the data transmission signal provided by the driver chip. Figure 7 As shown, the data signal changes ahead of the frame synchronization signal, so that the data signal can be written into the data input terminal of the pixel unit first, and then the frame synchronization signal changes to control the second gate control signal to be effective, so that the data signal is written into the gate of the driving transistor, thereby reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the driving circuit and signal interference, and improving the reliability of the display panel.

[0073] In addition, the effective level of the second gate control signal is ahead of the effective level of the first gate control signal, so that the data signal is first written into the gate of the driving transistor T1, and then the driving transistor T1 forms a driving current according to the data signal, driving the light-emitting device to emit light according to the data signal of the current frame, which can ensure the normal operation of the pixel unit.

[0074] In some embodiments, adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal so that the power change amount of the analog power supply voltage signal is less than a preset power change amount when the data signal changes includes:

[0075] The data signal is charged to the pixel unit multiple times; the voltage after each charging is greater than the voltage after the previous charging.

[0076] Specifically, during the data writing stage, the data signal can be charged to the pixel unit multiple times, and the voltage after each charge is greater than the voltage after the previous charge, so that the voltage of the data signal gradually changes to the data voltage of the current frame, thereby reducing the instantaneous impact during the data voltage change process, and then reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel.

[0077] Preferably, charging the data signal to the pixel unit multiple times comprises:

[0078] The data signal is charged to the pixel unit in a step-by-step manner.

[0079] In some embodiments, the pixel unit includes a pixel circuit and a light emitting unit; and driving the pixel unit to display based on the data signal according to the first gate control signal includes:

[0080] In the light-emitting stage, the first gate control signal is controlled to be effective, so that the pixel circuit forms a driving current according to the data signal to drive the light-emitting unit to display.

[0081] Specifically, when the first gate control signal is valid, the pixel circuit can generate a driving current according to the data signal. Figure 5 , the first gate control signal may include a light emitting control signal EM. When the fifth transistor T5 and the sixth transistor T6 are P-type transistors, the light emitting control signal EM is effective at a low level. In the light emitting stage, the light emitting control signal EM output by the light emitting control circuit is at a low level, the fifth transistor T5 and the sixth transistor T6 are turned on, and the driving transistor T1 forms a driving current according to the gate data signal and the first power supply signal ELVDD, driving the light emitting device to emit light according to the current data signal.

[0082] The embodiment of the present invention further provides a display panel driving device for driving the display panel. The display panel includes a pixel unit. Figure 8FIG. 1 is a schematic diagram of a structure of a driving device for a display panel provided by an embodiment of the present invention. Figure 8 As shown, the driving device includes:

[0083] The regulating module 100 is used to regulate the power variation of the analog power supply voltage signal when the data signal changes to be less than a preset power variation according to the variation rate of the data signal and / or the voltage value of the analog power supply voltage signal during the data writing phase;

[0084] The driving module 200 is used to drive the pixel unit to display based on the data signal according to the first gate control signal during the light emitting stage.

[0085] The technical solution of this embodiment adjusts the change rate of the data signal and / or the voltage value of the analog power supply voltage signal during the data writing stage so that the power change of the analog power supply voltage signal is less than the preset power change when the data signal changes, thereby reducing the instantaneous large current of the analog power supply voltage, reducing the probability of damage to the drive circuit and signal interference, and improving the reliability of the display panel. When the analog power supply voltage is provided by the power chip, the probability of replacing the power chip can be reduced, and the probability of improving the process equipment is also reduced.

[0086] Optionally, the adjustment module includes:

[0087] A first regulating unit, used for regulating the analog power supply voltage to a first voltage in a first data writing phase; wherein the first voltage is less than a preset voltage of the analog power supply voltage;

[0088] The second regulating unit is used to write the data signal into the pixel unit in the second data writing phase; wherein the data signal is the data voltage of the current frame, and the starting time of the first data writing phase at least does not lag behind the starting time of the second data writing phase.

[0089] Optionally, the driving device of the display panel further includes:

[0090] The control module is used to control the data signal to be in a high impedance state.

[0091] Optionally, the difference between the first voltage and the preset voltage ranges from 0.3V to 0.5V.

[0092] Optionally, the second regulating unit is used to charge the data signal multiple times to a data voltage of the current frame and write it into the pixel unit; the voltage after each charging is greater than the voltage after the previous charging;

[0093] Preferably, the second regulating unit is used for charging the data signal in a step-by-step manner to a data voltage of a current frame.

[0094] Optionally, the second adjusting unit includes:

[0095] A transmission unit, used for transmitting a data signal to a data input terminal of the pixel unit;

[0096] The control unit is used to control the second gate control signal to be effective so that the data signal is transmitted to the gate of the driving transistor of the pixel unit through the data input terminal, and the effective level of the second gate control signal is ahead of the effective level of the first gate control signal.

[0097] In some embodiments, the regulating module is used to charge the data signal to the pixel unit multiple times; the voltage after each charging is greater than the voltage after the previous charging.

[0098] Preferably, the regulating module is used to charge the data signal to the pixel unit in a step-by-step manner.

[0099] An embodiment of the present invention further provides a display device. Fig. 9 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present invention. Fig. 9 As shown, the display device includes a display panel 101 and a display panel driving device 102 provided in any embodiment of the present invention. The display panel 101 is connected to the display panel driving device 102, and the display panel driving device 102 is used to drive the display panel 101 to display. Since the display device includes the display panel driving device 102 provided in any embodiment of the present invention, it has the same beneficial effects as the display panel driving device 102 provided in any embodiment of the present invention, which will not be repeated here. The display device can be, for example, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a smart wearable device, an information inquiry machine in a public place hall, and any other product or component with a display function.

[0100] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for driving a display panel, characterized in that: The display panel includes a pixel unit, and the driving method of the display panel includes: During the data writing phase, adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal so that the power change amount of the analog power supply voltage signal when the data signal changes is less than a preset power change amount; In the light emitting stage, the pixel unit is driven to display based on the data signal according to the first gate control signal.

2. The method for driving a display panel according to claim 1, wherein: In the data writing stage, adjusting the power change amount of the analog power supply voltage signal when the data signal changes according to the change rate of the data signal and / or the voltage value of the analog power supply voltage signal to be less than the preset power change amount includes: In the first data writing phase, adjusting the analog power supply voltage to a first voltage; wherein the first voltage is less than a preset voltage of the analog power supply voltage; In the second data writing phase, a data signal is written into the pixel unit; wherein the data signal is a data voltage of a current frame, and the start time of the first data writing phase at least does not lag behind the start time of the second data writing phase.

3. The method for driving a display panel according to claim 2, wherein: Before the second data writing stage, the method further includes: The data signal is controlled to be in a high impedance state.

4. The method for driving a display panel according to claim 2, wherein: The difference between the first voltage and the preset voltage is in the range of 0.3V-0.5V.

5. The method for driving a display panel according to claim 2, wherein: Writing data signals into pixel units includes: The data signal is charged multiple times to become the data voltage of the current frame, and written into the pixel unit; the voltage after each charging is greater than the voltage after the previous charging; Preferably, charging the data signal multiple times to the data voltage of the current frame comprises: The data signal is charged stepwise to become the data voltage of the current frame.

6. The method for driving a display panel according to any one of claims 2 to 5, characterized in that: After the data signal is written into the pixel unit, the method includes: Transmitting a data signal to a data input terminal of the pixel unit; The second gate control signal is controlled to be effective, so that the data signal is transmitted to the gate of the driving transistor of the pixel unit through the data input terminal, and the effective level of the second gate control signal is ahead of the effective level of the first gate control signal.

7. The method for driving a display panel according to claim 1, wherein: Adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal so that the power change amount of the analog power supply voltage signal is less than a preset power change amount when the data signal changes, including: Charging the data signal to the pixel unit multiple times; the voltage after each charging is greater than the voltage after the last charging; Preferably, charging the data signal to the pixel unit multiple times comprises: charging the data signal to the pixel unit in a step-by-step manner.

8. The method for driving a display panel according to claim 1, wherein: The pixel unit includes a pixel circuit and a light emitting unit; Driving the pixel unit to display based on the data signal according to the first gate control signal includes: In the light emitting stage, the first gate control signal is controlled to be effective, so that the pixel circuit forms a driving current according to the data signal to drive the light emitting unit to display.

9. A driving device for a display panel, characterized in that: The display panel includes a pixel unit, and the driving device of the display panel includes: An adjustment module, used for adjusting the change rate of the data signal and / or the voltage value of the analog power supply voltage signal, so that the power change amount of the analog power supply voltage signal is less than a preset power change amount when the data signal changes; The driving module is used to drive the pixel unit to display based on the data signal according to the first gate control signal during the light emitting stage.

10. A display device, characterized in that: It comprises a display panel and a driving device for the display panel as claimed in claim 9; the display panel is connected to the driving device for the display panel, and the driving device for the display panel is used to drive the display panel to display.

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