Display driving method, display panel, display device and computer storage medium

Abstract

The present application relates to a display driving method, a display panel, a display device and a computer storage medium, wherein the display driving method comprises: adjusting the threshold voltage of a driving transistor in a pixel circuit according to a threshold voltage adjustment strategy; obtaining a first brightness of a light-emitting element controlled by the pixel circuit in a display stage based on the adjusted threshold voltage; when the first brightness is less than a target brightness, performing again the step of adjusting the threshold voltage of the driving transistor according to the threshold voltage adjustment strategy until the first brightness is equal to the target brightness; reducing the first power supply voltage of the pixel circuit according to the target threshold voltage, wherein the threshold voltage adjustment strategy is to provide a first data signal to the control terminal of the driving transistor within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor. The present application reduces the voltage required for the display panel by reducing the absolute value of the threshold voltage of the driving transistor, thereby achieving the purpose of reducing power consumption.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display driving method, a display panel, a display device and a computer storage medium. Background Art

[0002] With the development of display technology, organic light-emitting diode (OLED) displays are increasingly used in electronic devices. OLED displays have excellent characteristics such as no need for backlight, high contrast, thin thickness, wide viewing angle, fast response speed, can be used for flexible panels, wide operating temperature range, simple structure and process, etc. With the growth of electronic product applications, the requirements for power consumption are getting higher and higher, especially for portable products and long-term standby products. Therefore, low-power display devices are the trend of future development. Summary of the invention

[0003] Based on this, in view of the above technical problems, it is necessary to provide a display driving method, a display panel, a display device and a computer storage medium to reduce power consumption.

[0004] In a first aspect, an embodiment of the present application provides a display driving method, which is applied to a display panel, wherein the display panel includes a pixel circuit and a light-emitting element, and the method includes:

[0005] The threshold voltage of the driving transistor in the pixel circuit is adjusted according to the threshold voltage adjustment strategy; wherein the threshold voltage adjustment strategy includes: providing a first data signal to the control terminal of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor;

[0006] Based on the adjusted threshold voltage, obtaining a first brightness of the light-emitting element controlled by the pixel circuit in a display stage;

[0007] When the first brightness is less than the target brightness, the step of adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy is performed again until the first brightness is equal to the target brightness;

[0008] The first power supply voltage of the pixel circuit is reduced according to a target threshold voltage; wherein the target threshold voltage is an absolute value of the threshold voltage of the driving transistor before adjustment.

[0009] In one embodiment, the driving transistor is a PMOS, the first data signal is a high level signal, and the carriers are electrons.

[0010] In one embodiment, the driving transistor is NMOS, the first data signal is a low level signal, and the carriers are holes.

[0011] In one of the embodiments, when the first brightness is equal to the target brightness, the absolute value of the adjusted threshold voltage of the driving transistor is less than the voltage difference, and the voltage difference is the difference between the first power supply voltage and the voltage of the second data signal, and the second data signal is a signal provided to the control terminal of the driving transistor during the display stage.

[0012] In one embodiment, the voltage difference is less than 0.01V.

[0013] In one embodiment, the method further comprises:

[0014] In the initial display stage, an initial data signal is written into the control terminal of the driving transistor, and the initial brightness of the light emitting element is controlled based on the initial data signal;

[0015] The initial data signal is adjusted to change the initial brightness of the light emitting element to obtain the target brightness, wherein the target brightness is the brightness corresponding to the minimum grayscale.

[0016] In a second aspect, an embodiment of the present application provides a display panel, comprising: a display driving circuit, a pixel circuit and a light-emitting element, wherein the pixel circuit comprises a driving transistor, a data writing module and a storage module, wherein the control end of the driving transistor is respectively connected to the second end of the data writing module and the first end of the storage module, the first end of the driving transistor is respectively connected to the first power signal end and the second end of the storage module, the second end of the driving transistor is connected to the anode of the light-emitting element, the control end of the data writing module is used to receive a scanning signal, the first end of the data writing module is used to receive a data signal, and the cathode of the light-emitting element is connected to the second power signal end; wherein the display driving circuit is used to:

[0017] The threshold voltage of the driving transistor in the pixel circuit is adjusted according to the threshold voltage adjustment strategy; wherein the threshold voltage adjustment strategy includes: providing a first data signal to the control terminal of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor;

[0018] Based on the adjusted threshold voltage, obtaining a first brightness of the light-emitting element controlled by the pixel circuit in a display stage;

[0019] When the first brightness is less than the target brightness, adjusting the threshold voltage of the driving transistor in the pixel circuit again according to the threshold voltage adjustment strategy until the first brightness is equal to the target brightness;

[0020] The first power supply voltage of the first power supply signal terminal is reduced according to a target threshold voltage; wherein the target threshold voltage is an absolute value of the threshold voltage of the driving transistor before adjustment.

[0021] In one embodiment, the first scan signal voltage received by the control end of the data writing module during the stage of adjusting the threshold voltage is smaller than the second scan signal voltage received during the display stage.

[0022] In a third aspect, an embodiment of the present application provides a display device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the display driving method described in the first aspect when executing the computer program.

[0023] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the display driving method described in the first aspect are implemented.

[0024] The display driving method, display panel, display device and computer storage medium, wherein the display driving method is applied to a display panel, the display panel includes a pixel circuit and a light-emitting element, and the display driving method includes: adjusting the threshold voltage of a driving transistor in the pixel circuit according to a threshold voltage adjustment strategy, and obtaining a first brightness of the light-emitting element controlled by the pixel circuit in a display stage based on the adjusted threshold voltage, when the first brightness is less than the target brightness, it indicates that the threshold voltage adjustment is insufficient, and the step of adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy is returned again until the first brightness is equal to the target brightness; wherein the threshold voltage adjustment strategy is to provide a first data signal to the control end of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor, based on which, the threshold voltage of the driving transistor can be drifted in a direction of decreasing absolute value during the threshold voltage adjustment stage, when the first brightness is equal to the target brightness, it indicates that the threshold voltage has been adjusted, in this case, the first power supply voltage is reduced according to the absolute value of the threshold voltage before the adjustment of the driving transistor, and compared with directly using the first power supply voltage to control the light-emitting element to emit light before the threshold voltage adjustment, the power consumption after using the reduced first power supply voltage after the threshold voltage adjustment is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 is a schematic structural diagram of a display panel according to an embodiment;

[0027] Figure 2 is a schematic structural diagram of a display panel according to another embodiment;

[0028] Figure 3 is a flow chart of a display driving method according to an embodiment;

[0029] Figure 4 A schematic diagram of a PMOS characteristic curve according to an embodiment;

[0030] Figure 5 A schematic diagram of an NMOS characteristic curve according to an embodiment;

[0031] Figure 6 is a timing diagram of a threshold voltage adjustment stage of an embodiment;

[0032] Figure 7 is a timing diagram of a display phase of an embodiment;

[0033] Figure 8 FIG2 is a second flow chart of a display driving method according to an embodiment;

[0034] Fig. 9 is a schematic structural diagram of a display panel according to another embodiment;

[0035] Fig.10 is a timing diagram of a threshold voltage adjustment stage in another embodiment;

[0036] Fig.11 is a timing diagram of a display phase of another embodiment;

[0037] Fig.12 is a flow chart of a display driving method according to another embodiment;

[0038] Fig.13 is a structural block diagram of a display device according to an embodiment;

[0039] Fig.14 FIG. 4 is a structural block diagram of a display device according to another embodiment. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first transistor may be referred to as a second transistor, and similarly, a second transistor may be referred to as a first transistor. Both the first transistor and the second transistor are transistors, but they are not the same transistor.

[0043] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0044] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0045] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0046] like Figure 1As shown, a display panel is provided, which may include a pixel circuit and a light-emitting element. Among them, the pixel circuit may include a driving transistor T1, a data writing module, and a storage module. The control terminal of the driving transistor T1 is respectively connected to the second terminal of the data writing module and the first terminal of the storage module. The first terminal of the driving transistor T1 is respectively connected to the first power signal terminal and the second terminal of the storage module. The second terminal of the driving transistor T1 is connected to the anode of the light-emitting element. The control terminal of the data writing module is used to receive the scan signal Vsn, and the first terminal of the data writing module is used to receive the data signal V DATA , and the cathode of the light-emitting element is connected to the second power signal terminal.

[0047] Exemplarily, the driving transistor T1 may be a MOS transistor. The data writing module may include a first transistor T2, the storage module may include a capacitor Cs, and the light-emitting element may include an OLED. Among them, the control terminal of the driving transistor T1 is respectively connected to the second terminal of the first transistor T2 and the first terminal of the capacitor Cs. The first terminal of the driving transistor T1 is respectively connected to the first power signal terminal and the second terminal of the capacitor Cs. The second terminal of the driving transistor T1 is connected to the anode of the OLED. The first terminal of the first transistor T2 is used to receive the data signal V DATA , the control terminal of the first transistor T2 is used to receive the scan signal Vsn, and the cathode of the OLED is connected to the second power signal terminal.

[0048] For Figure 1 the display panel shown, taking the driving transistor T1 as a MOS transistor as an example, its power consumption mainly comes from between the first power signal and the second power signal. Among them, the current Idrive is determined by the brightness of the light-emitting element, and the light-emitting element cannot change after being specified. The voltage includes the power supply voltage trace resistance voltage Vloss, the source-drain voltage Vds of the driving transistor T1, and the voltage Voled across the two poles of the light-emitting element. Among them, the voltage Voled of the light-emitting element is the inherent characteristic of the device and is difficult to reduce. Since the resistance on the power supply voltage trace is small, Vloss is generally small. In order to ensure the magnitude and stability of the current, the driving transistor T1 needs to operate in the saturation region, so it is necessary to satisfy |Vgs| > |V TH | and |Vds| > |Vgs| - |V TH |, where Vgs is the voltage between the gate and the source of the driving transistor T1, Vds is the voltage between the drain and the source of the driving transistor T1, and V TH is the threshold voltage of the driving transistor T1. The threshold voltage refers to the voltage at which the driving transistor T1 starts to conduct when the gate voltage of the driving transistor T1 reaches a certain value. Generally, the voltage range of the data signal V DATA is between V GSP ~V GMP , where V GSPis the voltage corresponding to the maximum gray scale of the display panel, V GMP is the voltage corresponding to the minimum grayscale. According to the current formula I drive =1 / 2*μ p C ox (W / L)(|V gs |-|V THP |) 2 It can be seen that when a certain brightness condition needs to be displayed, the source voltage of the driving transistor T1 must be greater than V GSP +|V TH |. Display panel driving transistor T1 threshold voltage |V TH |Usually 2~3V, when the current is 300mA, there will be about 600mW of power consumption.

[0049] Based on the above, the present application provides a display driving method, which can be applied to Figure 1 and Figure 2 The display panel shown. Figure 2 Compared to Figure 1 , the pixel circuit may further include a light emitting control module, the control end of the light emitting control module is used to receive the light emitting control signal EM, the first end of the light emitting control module is connected to the anode of the light emitting element, and the second end of the light emitting control module is connected to the second end of the driving transistor T1. Exemplarily, the light emitting control module may include a second transistor T3, the control end of the second transistor T3 is used to receive the light emitting control signal EM, the first end of the first transistor T2 is connected to the anode of the OLED, and the second end of the first transistor T2 is connected to the second end of the driving transistor T1. Figure 2 The display panel shown in FIG. 1 is used, and the display driving method is described by taking each transistor T1 to T3 as a PMOS as an example, wherein the control end of each transistor is a gate, the first end is a source, and the second end is a drain. Figure 3 As shown, the display driving method may include the following steps S302 to S308.

[0050] S302: adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy, wherein the threshold voltage adjustment strategy includes: providing a first data signal to the control terminal of the driving transistor of the pixel circuit within a preset time period, so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor. The preset time period is pre-set and can be recorded as T, which is not limited here.

[0051] The driving transistor T1 may be a PMOS (Metal Oxide semiconductor, metal oxide semiconductor field effect transistor) or an NMOS. Figure 4As shown, when the driving transistor T1 is a PMOS, the first data signal is a high-level signal, and the carriers are electrons. That is, when a forward bias electric field is applied to the PMOS gate, the electrons will accumulate at the interface between the substrate and the insulating layer of the PMOS, passivating the defects at and near the interface, causing the threshold voltage of the PMOS to drift positively, thereby reducing the absolute value of the threshold voltage of the PMOS. Figure 5 As shown, in the case where the driving transistor T1 is NMOS, the first data signal is a low-level signal, and the carriers are holes, that is, when a negative bias electric field is applied to the gate of the NMOS, the holes will accumulate at the interface between the substrate and the insulating layer of the NMOS, passivating the defects at and near the interface, causing the threshold voltage of the NMOS to drift negatively, thereby reducing the absolute value of the threshold voltage of the NMOS.

[0052] During the application process, in the threshold voltage adjustment stage, you can use Figure 6 The timing sequence shown in the figure adjusts the threshold voltage of the driving transistor T1 in the display panel in a positive direction, and the time is T. Specifically, a first scanning signal with a low level VGL1 is provided to the gate of the first transistor T2, a first data signal with a high level VPB is provided to the first end of the first transistor T2, and a light emitting control signal EM with a high level VGH is provided to the second transistor T3. In this case, the first transistor T2 is turned on, and the second transistor T3 is turned off, and the voltage VPB of the first data signal is transmitted to the driving node V PG , so as to positively adjust the threshold voltage of the driving transistor T1.

[0053] S304: Based on the adjusted threshold voltage, obtaining a first brightness of the light-emitting element controlled by the pixel circuit in the display stage.

[0054] After adjusting the threshold voltage of the driving transistor T1 based on the above step S302, the following method can be used: Figure 7 The timing control display panel emits light to obtain the first brightness after the threshold voltage is adjusted. Specifically, in the data writing stage, a second scanning signal with a low level VGL is provided to the gate of the first transistor T2, a second data signal with a high level is provided to the first end of the first transistor T2, and a light emission control signal EM with a high level VGH is provided to the second transistor T3. In this case, the first transistor T2 is turned on, the second transistor T3 is turned off, and the voltage V DATA 'Transmitted to the driving node V through the first transistor T2 PG , capacitor Cs stores the second data signal V DATA ' potential. Wherein, the voltage of the second data signal V DATAThe absolute value of ' is less than the absolute value of the first power supply voltage ELVDD of the first power supply signal terminal. In the embodiment of the present application, the first power supply voltage ELVDD is equal to the voltage V DATA ' is recorded as V1, then V DATA '=ELVDD-V1, wherein V1 is greater than 0. Exemplarily, the voltage difference V1 is less than 0.01V.

[0055] In the light-emitting stage, a third scanning signal with a high level VGH is provided to the gate of the first transistor T2, and a light-emitting control signal EM with a low level VGL is provided to the second transistor T3. In this case, the first transistor T2 is turned off, the second transistor T3 is turned on, and the current of the driving transistor T1 passes through the OLED to make it emit light. In this case, the first brightness is obtained and recorded as L2.

[0056] Optionally, in the stage of adjusting the threshold voltage in step S304, the first scan signal voltage received by the control end of the data writing module is VGL1, and in the display stage in step S306, the second scan signal voltage received by the control end of the data writing module is VGL, wherein the first scan signal voltage VGL1 is less than the second scan voltage VGL, so that the voltage between the control end and the first end of the data writing module is too large during the threshold voltage adjustment stage, and the device is damaged by the excessive voltage reduction. Figure 2 The data writing module shown includes a first transistor T2 which is a PMOS, and VGL1<VGL, which can prevent the voltage between the gate and the source of the first transistor T2 from being too large during the threshold adjustment stage.

[0057] S306: Compare the first brightness with the target brightness. If the first brightness is less than the target brightness, return to step S202, that is, perform the step of adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy again until the first brightness is equal to the target brightness, and perform step S308.

[0058] The target brightness is pre-set and can be measured by controlling the display panel in advance, or it can be a pre-stored fixed brightness value, which is not limited here. The target brightness ranges from the lowest grayscale to the highest grayscale, and the target brightness can take any grayscale value. In the embodiment of the present application, the target brightness is recorded as L1.

[0059] When the first brightness L2 is less than the target brightness L1, it indicates that the threshold voltage is not adjusted enough and the threshold voltage needs to be adjusted further, that is, the process returns to step S302. Steps S302 to S306 are repeatedly executed until the first brightness L2 is equal to the target brightness L1. At this time, the threshold voltage has been adjusted and step S308 is executed.

[0060] S308: reducing the first power supply voltage of the pixel circuit according to the target threshold voltage, wherein the target threshold voltage is the absolute value of the threshold voltage of the driving transistor before adjustment.

[0061] The target threshold voltage is the absolute value of the threshold voltage of the driving transistor T1 before adjustment, that is, the target threshold voltage is the absolute value of the threshold voltage of the driving transistor T1 without adopting the above step S302, and is denoted as |V THP |.

[0062] for Figure 2 For the display panel shown in FIG. 1 , the target brightness L1 is the lowest gray scale, and the data signal voltage corresponding to the brightness is recorded as V GMP According to the current formula, the current flowing through the OLED at this time is I drive1 =1 / 2*μ p C ox (W / L)(ELVDD-V GMP -|V THP |) 2 When the first brightness L2 is equal to the target L1, the current formula can be used to obtain I drive2 =1 / 2*μ p C ox (W / L)(ELVDD-ELVDD+V1-|V THP1 |) 2 , where V THP1 is the adjusted threshold voltage. Since L1=L2, I drive1 = I drive2 We can get V1-|V THP1 |= ELVDD-V GMP -|V THP |, then |V THP1 |= V1-ELVDD+V GMP +|V THP |, where ELVDD-V GMP -|V THP |>0, the absolute value of the threshold voltage after adjustment|V THP1 | is smaller than the set V1 voltage. When V1 is set close to 0, the absolute value of the adjusted threshold voltage |V THP1 |Close to 0V.

[0063] Since the absolute value of the threshold voltage is reduced to a value less than V1, the ELVDD power supply voltage can be reduced at this time. Under the same brightness condition, according to the current formula, we can get

[0064] I drive1 =1 / 2*μ p C ox (W / L)(ELVDD-V GSP-|V THP |) 2

[0065] =1 / 2*μ p C ox (W / L)(ELVDD1-V GSP -|V THP1 |) 2 (1)

[0066] Then ΔELVDD=ELVDD-ELVDD1=|V THP |-|V THP1 |>|V THP |-V1, so under the same current conditions, the voltage of ELVDD can be reduced by about |V THP |-V1, when V1 is close to 0V, ELVDD can reduce |V THP |, so it can save power consumption P=I drive *|V THP |, at this time, the power consumption of the display panel can be reduced to the greatest extent. Assuming that the threshold voltage of the display panel transistor is about 2.5V, when the current is 200mA, the power consumption will be reduced by about 500mW.

[0067] The display driving method adjusts the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy, and obtains the first brightness of the light-emitting element controlled by the pixel circuit in the display stage based on the adjusted threshold voltage. When the first brightness is less than the target brightness, it indicates that the threshold voltage is not adjusted enough, and the step of adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy is returned again until the first brightness is equal to the target brightness; wherein the threshold voltage adjustment strategy is to provide a first data signal to the control end of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor. Based on this, the threshold voltage of the driving transistor can be drifted in the direction of decreasing the absolute value during the threshold voltage adjustment stage. When the first brightness is equal to the target brightness, it indicates that the threshold voltage has been adjusted. In this case, the first power supply voltage is reduced according to the absolute value of the threshold voltage before the adjustment of the driving transistor. Compared with directly using the first power supply voltage to control the light-emitting element to emit light before the threshold voltage is adjusted, the power consumption after using the reduced first power supply voltage after the threshold voltage is adjusted is smaller, that is, by reducing the absolute value of the threshold voltage of the driving transistor, the power supply voltage required for the display panel is reduced, so that under the same current, the display panel power consumption after the power supply voltage is reduced is lower.

[0068] In one embodiment, Figure 8 As shown, the display driving method may further include the following steps S802 and S804 to obtain the target brightness L1.

[0069] S802: In the initial display stage, an initial data signal is written into the control terminal of the driving transistor, and the initial brightness of the light emitting element is controlled based on the initial data signal.

[0070] by Figure 2 Taking the display panel shown as an example, in the initial display stage, a low-level scanning signal is provided to the gate of the first transistor T2, and a high-level scanning signal is provided to the second transistor T3. At this time, the first transistor T2 is turned on, the second transistor T3 is turned off, and the initial voltage of the initial data signal is written to the gate of the driving transistor T1, and the capacitor Cs stores the initial voltage. Then, a high-level scanning signal is provided to the gate of the first transistor T2, and a low-level scanning signal is provided to the second transistor T3. At this time, the first transistor T2 is turned off, the second transistor T3 is turned on, and the current of the driving transistor T1 drives the OLED to emit light.

[0071] S804: Adjust the initial data signal to change the initial brightness of the light emitting element to obtain a target brightness, wherein the target brightness is the brightness corresponding to the minimum grayscale.

[0072] The voltage of the initial data signal is changed, and the above step S802 is performed again, so that the brightness of the light-emitting element is the minimum gray scale, thereby obtaining the target brightness L1.

[0073] It should be noted that the above method is also applicable to a display panel in which each transistor is an NMOS. Figure 8 The signal level control logic is the same, but opposite, which will not be described here.

[0074] The above-mentioned display driving method can change the luminous brightness of the light-emitting element to reach the minimum grayscale by adjusting the initial data signal before adjusting the threshold voltage of the driving transistor, so as to obtain the target brightness of the display panel, and then adjust the threshold voltage of the driving transistor according to the target brightness to minimize the absolute value of the threshold voltage and minimize power consumption.

[0075] It can be understood that the above description is based on the example of a PMOS transistor. In practical applications, each transistor in the display panel may also be an NMOS transistor. Fig. 9 As shown, the control end of each transistor is a gate, the first end is a drain, and the second end is a source. Fig. 9 The display panel shown can be Fig.10 and Fig.11 The timing shown uses Fig.12 The display driving method shown adjusts the absolute value of the threshold voltage of the driving transistor T1 to reduce the power consumption of the display panel. Fig.12 The display driving method shown is similar to the above-mentioned Figure 2 The driving methods of the display panels shown are the same, with the same principle, except that the signal level logic control is opposite.

[0076] S1202: In the initial display stage, an initial data signal is written into the control terminal of the driving transistor, and the initial brightness of the light emitting element is controlled based on the initial data signal.

[0077] S1204: Adjust the initial data signal to change the initial brightness of the light emitting element to obtain a target brightness, wherein the target brightness is the brightness corresponding to the minimum grayscale.

[0078] In this case, the brightness is recorded as L1 and the initial data signal voltage is recorded as V GMN According to the current formula, the current flowing through the OLED device at this time can be obtained as:

[0079] I drive3 =1 / 2*μ n C ox (W / L)( V GMN -ELVSS-|V THN |) 2 (2)

[0080] S1206: Adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy, wherein the threshold voltage adjustment strategy includes: providing a first data signal to the control terminal of the driving transistor of the pixel circuit within a preset time period so that holes accumulate at the interface between the substrate and the insulating layer of the driving transistor.

[0081] Specifically, Fig.10 In the timing sequence shown in FIG. 1 , within the preset time period T, a first scanning signal with a high level VGH1 is provided to the gate of the first transistor T2, a first data signal with a low level VNB is provided to the first end of the first transistor T2, and a light emitting control signal EM with a low level VGL is provided to the second transistor T3. In this case, the first transistor T2 is turned on, and the second transistor T3 is turned off, and the voltage VNB of the first data signal is transmitted to the driving node V via the first transistor T2. NG , so as to reversely adjust the threshold voltage of the driving transistor T1.

[0082] S1208: Based on the adjusted threshold voltage, obtaining a first brightness of the light-emitting element controlled by the pixel circuit in the display stage.

[0083] Specifically, Fig.11As shown in the timing, in the data writing stage, a second scanning signal with a high level VGH is provided to the gate of the first transistor T2, a second data signal with a high level is provided to the first end of the first transistor T2, and a light emitting control signal EM with a low level VGL is provided to the second transistor T3. In this case, the first transistor T2 is turned on, the second transistor T3 is turned off, and the voltage of the second data signal V DATA ''Transmitted to the driving node V through the first transistor T2 NG , capacitor Cs stores the second data signal V DATA '' potential. Wherein, the voltage of the second data signal V DATA ''=V1+ELVSS, and V1 is less than 0.01V.

[0084] In the light-emitting stage, a third scanning signal with a low level VGL is provided to the gate of the first transistor T2, and a light-emitting control signal EM with a high level VGH is provided to the second transistor T3. In this case, the first transistor T2 is turned off, the second transistor T3 is turned on, and the current of the driving transistor T1 passes through the OLED to make it emit light. In this case, the first brightness is obtained and recorded as L2.

[0085] S1210: Compare the first brightness with the target brightness. If the first brightness is less than the target brightness, return to step S1206, that is, perform the step of adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy again until the first brightness is equal to the target brightness, and perform step S1212.

[0086] S1212: reducing the first power supply voltage of the pixel circuit according to the target threshold voltage. The target threshold voltage is the absolute value of the threshold voltage of the driving transistor before adjustment |V THN |. Under the same current conditions, the voltage of ELVSS can be reduced by about |V THN |-V1, when V1 is close to 0V, ELVSS can raise |V THN |, so it can save power consumption P=I drive *|V THN |, at this time, the power consumption of the display panel can be reduced to the greatest extent. Figure 2 In the display panel shown, the first power supply voltage is ELVDD; Fig. 9 In the display panel shown, the first power supply voltage is ELVSS.

[0087] In the above display driving method, the threshold voltage of the driving transistor in the pixel circuit is adjusted according to the threshold voltage adjustment strategy, and based on the adjusted threshold voltage, the first brightness of the light-emitting element controlled by the pixel circuit in the display stage is obtained. When the first brightness is less than the target brightness, it indicates that the threshold voltage adjustment is insufficient, and the step of adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy is returned again until the first brightness is equal to the target brightness. The threshold voltage adjustment strategy is to provide a first data signal to the control end of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor. Based on this, the threshold voltage of the driving transistor can be drifted in the direction of decreasing the absolute value during the threshold voltage adjustment stage. When the first brightness is equal to the target brightness, it indicates that the threshold voltage has been adjusted. In this case, the first power supply voltage is reduced according to the absolute value of the threshold voltage before the adjustment of the driving transistor. Compared with directly using the first power supply voltage to control the light-emitting element to emit light before the threshold voltage adjustment, the power consumption after using the reduced first power supply voltage after the threshold voltage adjustment is smaller, that is, by reducing the absolute value of the threshold voltage of the driving transistor, the power supply voltage required for the display panel is reduced, so that under the same current, the display panel power consumption after the power supply voltage is reduced is lower.

[0088] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0089] Based on the same inventive concept, the embodiment of the present application also provides a display panel for implementing the display driving method involved above. The implementation scheme for solving the problem provided by the display panel is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more display panel embodiments provided below can refer to the limitations on the display driving method above, and will not be repeated here.

[0090] In one embodiment, Fig.13As shown, a display panel is provided, including: a display driving circuit 1301, a pixel circuit 1302 and a light-emitting element 1303, wherein the pixel circuit 1302 includes a driving transistor, a data writing module and a storage module, wherein the control end of the driving transistor is respectively connected to the second end of the data writing module and the first end of the storage module, the first end of the driving transistor is respectively connected to the first power signal end and the second end of the storage module, the second end of the driving transistor is connected to the anode of the light-emitting element, the control end of the data writing module is used to receive a scanning signal, the first end of the data writing module is used to receive a data signal, and the cathode of the light-emitting element is connected to the second power signal end. Exemplarily, the pixel circuit 1302 and the light-emitting element 1303 can be Figure 1 , Figure 2 , Figure 8 For the structure shown, please refer to the above-mentioned related content, which will not be repeated here.

[0091] The display driving circuit 1301 is used to: adjust the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy; based on the adjusted threshold voltage, obtain the first brightness of the light-emitting element controlled by the pixel circuit 1302 in the display stage; when the first brightness is less than the target brightness, adjust the threshold voltage of the driving transistor in the pixel circuit again according to the threshold voltage adjustment strategy until the first brightness is equal to the target brightness; reduce the first power supply voltage of the first power supply signal terminal according to the target threshold voltage. The threshold voltage adjustment strategy includes: providing a first data signal to the control terminal of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor, and the target threshold voltage is the threshold voltage of the driving transistor before adjustment.

[0092] The above-mentioned display panel includes a display driving circuit 1301, a pixel circuit 1302 and a light-emitting element 1303. The display driving circuit 1301 can adjust the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy, and obtain the first brightness of the light-emitting element controlled by the pixel circuit in the display stage based on the adjusted threshold voltage. When the first brightness is less than the target brightness, it indicates that the threshold voltage adjustment is insufficient, and the threshold voltage of the driving transistor in the pixel circuit is adjusted again according to the threshold voltage adjustment strategy until the first brightness is equal to the target brightness; wherein the threshold voltage adjustment strategy is to provide a first data signal to the control end of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor. Based on this, the threshold voltage of the driving transistor can drift in the direction of decreasing the absolute value during the threshold voltage adjustment stage. When the first brightness is equal to the target brightness, it indicates that the threshold voltage has been adjusted. In this case, the first power supply voltage is reduced according to the absolute value of the threshold voltage before the adjustment of the driving transistor. Compared with directly using the first power supply voltage to control the light-emitting element to emit light before the threshold voltage adjustment, the power consumption after using the reduced first power supply voltage after the threshold voltage adjustment is smaller.

[0093] In one embodiment, the first scan signal voltage received by the control end of the data writing module in the threshold voltage adjustment stage is smaller than the second scan signal voltage received in the display stage.

[0094] In one embodiment, the driving transistor is a PMOS, the first data signal is a high level signal, and the carriers are electrons.

[0095] In one embodiment, the driving transistor is an NMOS, the first data signal is a low level signal, and the carriers are holes.

[0096] In one embodiment, when the first brightness is equal to the target brightness, the absolute value of the adjusted threshold voltage of the driving transistor is less than the voltage difference, and the voltage difference is the difference between the first power supply voltage and the voltage of the second data signal. The second data signal is a signal provided to the control terminal of the driving transistor during the display stage.

[0097] In one embodiment, the voltage difference is less than 0.01V.

[0098] In one embodiment, the display driving circuit 1301 is also used to: in the initial display stage, write the initial data signal into the control end of the driving transistor, and control the initial brightness of the light emitting element based on the initial data signal; adjust the initial data signal to change the initial brightness of the light emitting element to obtain the target brightness, wherein the target brightness is the brightness corresponding to the minimum grayscale.

[0099] In one embodiment, a display device is provided, whose internal structure diagram can be as follows: Fig.14 As shown. The display device includes a processor, a memory, a communication interface, a display panel and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the display device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the display device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a display driving method is implemented. The display panel of the display device can be a liquid crystal display or an electronic ink display, and the input device of the display device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the display device housing, or an external keyboard, touchpad or mouse, etc.

[0100] Those skilled in the art will understand that Fig.14 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the display device to which the scheme of the present application is applied. The specific display device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0101] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above display driving method are implemented.

[0102] In one embodiment, a computer program product is provided, including a computer program, which implements the steps of the above display driving method when executed by a processor.

[0103] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0104] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0105] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A display driving method, characterized in that: Applied to a display panel, the display panel includes a pixel circuit and a light-emitting element, and the method includes: The threshold voltage of the driving transistor in the pixel circuit is adjusted according to the threshold voltage adjustment strategy; wherein the threshold voltage adjustment strategy includes: providing a first data signal to the control terminal of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor; Based on the adjusted threshold voltage, obtaining a first brightness of the light-emitting element controlled by the pixel circuit in a display stage; When the first brightness is less than the target brightness, the step of adjusting the threshold voltage of the driving transistor in the pixel circuit according to the threshold voltage adjustment strategy is performed again until the first brightness is equal to the target brightness; reducing the first power supply voltage of the pixel circuit according to a target threshold voltage; wherein the target threshold voltage is an absolute value of the threshold voltage of the driving transistor before adjustment; When the first brightness is equal to the target brightness, the absolute value of the adjusted threshold voltage of the driving transistor is less than the voltage difference, and the voltage difference is the difference between the first power supply voltage and the voltage of the second data signal, and the second data signal is a signal provided to the control end of the driving transistor during the display stage.

2. The method according to claim 1, characterized in that The driving transistor is a PMOS, the first data signal is a high level signal, and the carriers are electrons.

3. The method according to claim 1, characterized in that The driving transistor is an NMOS, the first data signal is a low level signal, and the carriers are holes.

4. The method according to claim 1, characterized in that The voltage difference is less than 0.01V.

5. The method according to claim 1, characterized in that The method further comprises: In the initial display stage, an initial data signal is written into the control terminal of the driving transistor, and the initial brightness of the light emitting element is controlled based on the initial data signal; The initial data signal is adjusted to change the initial brightness of the light emitting element to obtain the target brightness, wherein the target brightness is the brightness corresponding to the minimum grayscale.

6. A display panel, characterized in that: include: A display driving circuit, a pixel circuit and a light-emitting element, wherein the pixel circuit comprises a driving transistor, a data writing module and a storage module, wherein the control end of the driving transistor is respectively connected to the second end of the data writing module and the first end of the storage module, the first end of the driving transistor is respectively connected to the first power signal end and the second end of the storage module, the second end of the driving transistor is connected to the anode of the light-emitting element, the control end of the data writing module is used to receive a scanning signal, the first end of the data writing module is used to receive a data signal, and the cathode of the light-emitting element is connected to the second power signal end; wherein the display driving circuit is used to: The threshold voltage of the driving transistor in the pixel circuit is adjusted according to the threshold voltage adjustment strategy; wherein the threshold voltage adjustment strategy includes: providing a first data signal to the control terminal of the driving transistor of the pixel circuit within a preset time period so that carriers accumulate at the interface between the substrate and the insulating layer of the driving transistor; Based on the adjusted threshold voltage, obtaining a first brightness of the light-emitting element controlled by the pixel circuit in a display stage; When the first brightness is less than the target brightness, adjusting the threshold voltage of the driving transistor in the pixel circuit again according to the threshold voltage adjustment strategy until the first brightness is equal to the target brightness; reducing the first power supply voltage of the first power supply signal terminal according to a target threshold voltage; wherein the target threshold voltage is an absolute value of the threshold voltage of the driving transistor before adjustment; When the first brightness is equal to the target brightness, the absolute value of the adjusted threshold voltage of the driving transistor is less than the voltage difference, and the voltage difference is the difference between the first power supply voltage and the voltage of the second data signal, and the second data signal is a signal provided to the control end of the driving transistor during the display stage.

7. The display panel according to claim 6, characterized in that: The first scanning signal voltage received by the control end of the data writing module in the stage of adjusting the threshold voltage is smaller than the second scanning signal voltage received in the display stage.

8. The display panel according to claim 6, characterized in that: The display driving circuit is also used to write an initial data signal into the control terminal of the driving transistor in the initial display stage, and control the initial brightness of the light emitting element based on the initial data signal; The initial data signal is adjusted to change the initial brightness of the light emitting element to obtain the target brightness, wherein the target brightness is the brightness corresponding to the minimum grayscale.

9. A display device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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