Pixel driving method and driving circuit, and display panel and display device

Abstract

A pixel driving method and driving circuit, and a display panel and a display device. The pixel driving method comprises the steps of: providing a display panel (S110); acquiring a display brightness value of the display panel (S120); on the basis of the display brightness value, adjusting a pulse width regarding a first scanning signal (S130), wherein a first pulse width corresponding to a first display brightness value is less than a second pulse width corresponding to a second display brightness value, the first display brightness value is less than a first preset threshold value, and the second display brightness value is greater than or equal to the first preset threshold value; on the basis of the adjusted pulse width, determining the first scanning signal (S140); and inputting the first scanning signal into a first initialization module (S150). The pixel driving method is conducive to ameliorating the problem of a display picture of an OLED display product flickering under a low-frequency drive.

Description

Pixel driving method and driving circuit, display panel and display device Technical Field

[0001] The present invention relates to the technical field of display panels, and in particular to a pixel driving method and driving circuit, a display panel, and a display device. Background Art

[0002] Organic Light-Emitting Diodes (OLEDs), with their advantages of low power consumption, low cost, self-luminescence, wide viewing angles, and fast response speeds, have become a research hotspot in the display field. Currently, OLEDs are mostly driven by low-temperature polycrystalline silicon (LTPS) backplanes. Electronic products use different refresh rates for different application scenarios. For example, a higher refresh rate drive method is used to drive dynamic images to ensure smooth display, while a lower refresh rate drive method is used to drive static images to reduce power consumption. Due to the inherent hysteresis effect of the LTPS backplane, OLED products can flicker when displayed at low refresh rates, affecting the visual experience.

[0003] Comparing Figures 1 and 2, Figure 1 shows the brightness variation curve at a 60Hz refresh rate, while Figure 2 shows the brightness variation curve at a 30Hz refresh rate. △LV represents the difference in brightness between two adjacent frames. As can be seen from Figures 1 and 2, the brightness variation difference △LV1 at a 30Hz refresh rate is greater than the brightness variation difference △LV2 at a 30Hz refresh rate. This means that low-frequency flicker is more noticeable.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field.

[0005] Summary of the Invention

[0006] In view of this, the present invention provides a pixel driving method and driving circuit, a display panel and a display device to improve the problem of display screen flickering in OLED display products under low-frequency driving.

[0007] According to one aspect of the present invention, a pixel driving method is provided, which is applied to a pixel driving circuit. The pixel driving circuit includes a first initialization module and a light-emitting driving module connected to each other, wherein the first initialization module and the light-emitting driving module are connected to form a first node, and the first initialization module is used to initialize the potential of the first node; the light-emitting driving module is used to drive a light-emitting element to emit light; the first initialization module is connected to a first scanning signal; and the method includes the following steps:

[0008] providing a display panel;

[0009] Obtaining a display brightness value of the display panel;

[0010] adjusting a pulse width of the first scanning signal according to the display brightness value; wherein a first pulse width corresponding to the first display brightness value is smaller than a second pulse width corresponding to the second display brightness value, the first display brightness value is smaller than a first preset threshold value, and the second display brightness value is greater than or equal to the first preset threshold value;

[0011] determining the first scanning signal according to the adjusted pulse width;

[0012] The first scanning signal is input to the first initialization module.

[0013] Optionally, adjusting the pulse width of the first scanning signal according to the display brightness value includes:

[0014] In response to the display brightness value being less than a first preset threshold, reducing the pulse width of the first scanning signal;

[0015] In response to the display brightness value being greater than or equal to a first preset threshold, the pulse width of the first scan signal is increased.

[0016] Optionally, the light-emitting driving module includes a driving transistor; the driving transistor is connected to the first initialization module to form the first node; and adjusting the pulse width of the first scanning signal according to the display brightness value includes:

[0017] In response to the display brightness value being less than a first preset threshold, reducing the duration during which the voltage difference between the gate and the source of the driving transistor is in a positive state;

[0018] In response to the display brightness value being greater than or equal to a first preset threshold, the duration during which the voltage difference between the gate and the source of the driving transistor is in a positive state is increased.

[0019] Optionally, the pixel driving circuit further includes a reset transistor connected to the anode of the light-emitting element; and adjusting the pulse width of the first scanning signal according to the display brightness value includes:

[0020] inputting an initial reset signal having a period of a frame period into the reset transistor;

[0021] Obtaining a delayed light emission time of a sub-pixel of the display panel in response to the initial reset signal;

[0022] The pulse width of the first scanning signal is adjusted until the frequency of brightness delay caused by the delayed light emitting time is no longer visible.

[0023] Optionally, the first initialization module includes a first switching device, a first electrode of the first switching device is connected to a first reference voltage signal, a second electrode is connected to the light-emitting driving module, a third electrode of the first switching device is connected to the first scanning signal, and the third electrode is a gate.

[0024] Optionally, the light-emitting driving module further includes a third switching device and a fourth switching device, and the gate of the third switching device and the gate of the fourth switching device are both connected to the second scan signal.

[0025] Optionally, a third pulse width of the second scanning signal corresponding to the first display brightness value is greater than a fourth pulse width of the second scanning signal corresponding to the second display brightness value.

[0026] Optionally, when the first scanning signal is at a valid level, the second scanning signal is at a non-valid level; and when the second scanning signal is at a valid level, the first scanning signal is at a non-valid level.

[0027] According to another aspect of the present invention, a pixel driving circuit is provided, comprising a first initialization module and a light-emitting driving module connected to each other, wherein the first initialization module is used to initialize the potential of the first node, and the light-emitting driving module is used to drive the light-emitting element to emit light; the first initialization module is connected to a first scanning signal, and the pulse width of the first scanning signal is adjusted based on any of the above-mentioned pixel driving methods.

[0028] According to another aspect of the present invention, a display panel is provided. The display panel includes the pixel driving circuit.

[0029] According to another aspect of the present invention, a display device is provided. The display device includes the display panel.

[0030] The beneficial effects of the present invention compared with the prior art are:

[0031] The pixel driving method and driving circuit, display panel, and display device provided by the present invention adjust the pulse width of the first scanning signal according to the display brightness value of the display panel, and input the adjusted first scanning signal into the first initialization module to adjust the working time during which the voltage difference between the gate and the source of the driving transistor is in a positive state, thereby reducing the influence of the hysteresis effect of the driving transistor on the flicker problem under low-frequency driving conditions, thereby improving the low-frequency flicker problem of OLED display products and enhancing their display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are incorporated into and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and it is clear that those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0033] FIG1 is a schematic diagram showing brightness changes of two adjacent frames of a pixel driving circuit in the prior art when the refresh rate is 60 Hz;

[0034] FIG2 is a schematic diagram showing brightness changes of two adjacent frames of a pixel driving circuit in the prior art when the refresh rate is 30 Hz;

[0035] FIG3 is a schematic structural diagram of a pixel driving circuit disclosed in an embodiment of the present invention;

[0036] FIG4 is a schematic flow chart of a pixel driving method disclosed in an embodiment of the present invention;

[0037] FIG. 5 is a schematic diagram showing the operation timing of the second scanning signal EN corresponding to the low brightness condition and the V of the driving transistor T2. GS Schematic diagram of state changes;

[0038] FIG. 6 is a schematic diagram showing the operation timing of the second scanning signal EN corresponding to the high brightness condition and the V of the driving transistor T2. GS Schematic diagram of state changes;

[0039] FIG7 is a schematic diagram of a screen flicker change curve when switching from 30 Hz to 60 Hz when the brightness change trend within a frame is inconsistent;

[0040] FIG8 is a schematic diagram of a screen flicker change curve when switching from 30 Hz to 60 Hz when the brightness change trend within a frame is consistent;

[0041] FIG. 9 shows the second scanning signal EN and the first scanning signal S before adjustment in two adjacent frames under low brightness conditions. n+1 Working timing diagram;

[0042] FIG. 10 shows the second scanning signal EN and the first scanning signal S before adjustment in two adjacent frames under high brightness conditions. n+1 Working timing diagram;

[0043] FIG. 11 shows the second scanning signal EN and the adjusted first scanning signal S in two adjacent frames under low brightness conditions. n+1 Working timing diagram;

[0044] FIG. 12 shows the second scanning signal EN and the adjusted first scanning signal S in two adjacent frames under high brightness conditions.n+1 Working timing diagram. DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure can be practiced without one or more of the above-mentioned specific details, or other methods, materials, devices, etc. may be adopted. In other cases, well-known technical solutions are not shown or described in detail to avoid blurring various aspects of the present disclosure. The same reference numerals in the figures represent the same or similar structures, and their detailed descriptions will be omitted.

[0046] The terms "a", "an", "the", "above", and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including", "having", and "having" are used to express open-ended inclusiveness and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0047] To address the above issues, as shown in Figure 3, one embodiment of the present invention discloses a pixel driver circuit. The pixel driver circuit includes a first initialization module, a second initialization module, and a light-emitting driver module. The first initialization module and the second initialization module are respectively connected to the light-emitting driver module. The first initialization module and the light-emitting driver module are connected to form a first node. The first initialization module is configured to initialize the potential of the first node. The light-emitting driver module is configured to drive a light-emitting element to emit light. The second initialization module is configured to initialize the anode of the light-emitting element.

[0048] In this embodiment, the first initialization module is respectively connected to the first reference voltage signal VINT1 and the first scan signal S n+1 The light emitting driving module is respectively connected to the second reference voltage signal ELVDD, the second scan signal EN, the preset data signal DATA and the third reference voltage signal ELVSS. The second initialization module is respectively connected to the initial reset signal S n And the fourth reference voltage signal VINT2 is connected. Among them, the first scan signal S n+1 The pulse width of the first scanning signal S is adjusted according to the display brightness value of the display panel, and the adjusted first scanning signal S n+1Enter the first initialization module.

[0049] Continuing to refer to FIG3 , the first initialization module includes a first switch device T1. The first electrode of the first switch device T1 is connected to the first reference voltage signal VINT1, the second electrode is connected to the light-emitting driving module, and the third electrode of the first switch device, i.e., the gate electrode, is connected to the first scan signal S n+1 The light driving module includes a third switch device T3, a driving transistor T2, a fourth switch device T4 and a light emitting element D1 connected in sequence. In this embodiment, the potential polarity of the first reference voltage signal VINT1 is a positive voltage, but the present invention is not limited thereto.

[0050] The first electrode of the third switching device T3 is connected to the second reference voltage signal ELVDD, and the second electrode of the third switching device T3, the first electrode of the driving transistor T2, and the second electrode of the first switching device T1 are connected together to form a first node N1. When the first switching device T1 is turned on, the voltage corresponding to the first reference voltage signal VINT1 is written to the first node N1. In this embodiment, the potential polarity of the first reference voltage signal VINT1 is a positive voltage. Therefore, at this time, the potential of the first node N1 is pulled high, and the voltage difference between the gate and source of the driving transistor T2, i.e., V GS When the first switch device T1 is not turned on, the V GS The value is a constant value.

[0051] A third electrode or gate of the third switching device T3 is connected to the second scan signal EN. A third electrode or gate of the driving transistor T2 is connected to the preset data signal DATA. A second electrode of the driving transistor T2 is connected to the first electrode of the fourth switching device T4. A third electrode or gate of the fourth switching device T4 is connected to the second scan signal EN. A second electrode of the fourth switching device T4 is connected to the anode of the light-emitting element D1. The cathode of the light-emitting element D1 is connected to the third reference voltage signal ELVSS.

[0052] The second initialization module includes a reset transistor T5. The first electrode of the reset transistor T5 is connected to the fourth reference voltage signal VINT2, the second electrode of the reset transistor T5 is connected to the anode of the light emitting element D1, and the third electrode of the reset transistor T5, i.e., the gate, is connected to the initial reset signal S n .

[0053] In this embodiment, the driving transistor T2 transmits the driving current I to the light emitting element D1. OLEDThe signal EN is a periodic cut-off signal input to the gate of the fourth switching device T4. In this embodiment, the signal EN is a periodic high-level signal, which is used to generate a black screen at a certain frequency in each frame period. Specifically, referring to FIG3 , when the gate of the fourth switching device T4 receives a high-level signal, the fourth switching device T4 is cut off, and the driving current I OLED The light cannot be transmitted to the OLED light emitting element D1 through the fourth switch device T4 , causing the brightness of the OLED light emitting element D1 to be reduced to zero, resulting in a black screen.

[0054] Continuing to refer to FIG3 , the initial reset signal S n Is the level signal received by the gate of the reset transistor T5. There is a parasitic capacitance C between the anode and cathode of the OLED light emitting element D1. OLED During the operation of the driving circuit, at the initial stage of a frame period, when the initial reset signal S is input to the gate of the reset transistor T5, n At this time, the EN signal is high, the OLED light emitting element D1 does not work, and the parasitic capacitance C of the reset transistor T5 to the OLED light emitting element D1 is OLED Perform discharge operation to prevent contrast from decreasing. n Set to high level, EN signal is set to low level, the reset process ends, and OLED light emitting element D1 enters the light emitting stage. However, due to the parasitic capacitance C OLED The driving current I that should flow from the anode of the OLED light-emitting element D1 to its cathode to make the OLED light-emitting element D1 emit light during the light-emitting phase OLED , first calculate the parasitic capacitance C OLED The charge is then passed through the OLED light emitting element D1, causing the OLED light emitting element D1 to enter the effective light emitting stage. OLED During the charging process, there is a certain time delay in the light emission of the OLED light emitting element D1, that is, there is a delayed light emission time.

[0055] From the above circuit structure, it can be seen that the initial reset signal S n The first scan signal S controls the on and off of the reset transistor T5. The second scan signal EN controls the on and off of the third switch device T3 and the on and off of the fourth switch device T4. n+1 Controls the on and off of the first switching device T1. When the preset data signal DATA writes the grayscale voltage to the gate of the driving transistor T2, the driving transistor T2 is turned on. The magnitude of the on-state current of the driving transistor T2 determines the grayscale driving current, thereby achieving different brightness levels.

[0056] In this embodiment, the third reference voltage signal ELVSS and the fourth reference voltage signal VINT2 are negative potentials, and the second reference voltage signal ELVDD is positive potential, that is, the second reference voltage signal ELVDD is output as a positive power supply voltage, and the third reference voltage signal ELVSS is output as a negative power supply voltage.

[0057] All switching devices involved in the above embodiments of the present invention can be P-type thin film transistors or N-type thin film transistors. And all switching devices in the circuit are of the same type, that is, all are P-type thin film transistors, or all are N-type thin film transistors. When all are P-type thin film transistors (i.e., P-type TFTs), the corresponding active level signal is a low level, and the inactive level signal is a high level. When all are N-type thin film transistors (N-type TFTs), the corresponding active level signal is a high level, and the inactive level signal is a low level.

[0058] It should be noted that in this embodiment, the switching devices selected in the circuit design of this embodiment are all P-type TFTs, and the corresponding active level signal is a low level, and the inactive level signal is a high level. However, the application is not limited to this type of switching device.

[0059] It should be further noted that the first electrode of all switching devices involved in the above embodiments of the present invention can be either a source or a drain, and the second electrode can also be the other of the source and drain. That is, for example, when the first electrode is a source, the second electrode is a drain. When the first electrode is a drain, the second electrode is a source.

[0060] Based on the pixel driving circuit, with reference to FIG4 , an embodiment of the present invention further discloses a pixel driving method applied to the above-mentioned pixel driving circuit. The pixel driving method includes the following steps: S110, providing a display panel. S120, obtaining a display brightness value of the above-mentioned display panel. The display brightness value is DBV (display brightness value). S130, adjusting the pulse width of the above-mentioned first scanning signal based on the above-mentioned display brightness value. The pulse width (Pulse-Width) is the duration of the inactive level. The first pulse width of the first scanning signal corresponding to the first display brightness value is less than the second pulse width of the first scanning signal corresponding to the second display brightness value. The above-mentioned first display brightness value is less than a first preset threshold, and the above-mentioned second display brightness value is greater than or equal to the above-mentioned first preset threshold. S140, determining a first scanning signal based on the adjusted pulse width. S150, inputting the first scanning signal into the above-mentioned first initialization module. Since the inactive level in this embodiment is a high level, the above-mentioned pulse width is the duration of the high level. In some examples, the first display brightness value may be understood as low brightness, and the second display brightness value may be understood as high brightness.

[0061] In step S130, an initial reset signal S with a period of a frame period is input to the reset transistor. n , obtain the delayed light emission time of the sub-pixel of the display panel in response to the above-mentioned initial reset signal, and adjust the pulse width of the above-mentioned first scanning signal until the frequency of the brightness delay caused by the above-mentioned delayed light emission time is no longer visible. That is, in this embodiment, by adjusting the signal S n+1 The pulse width is adjusted to adjust the voltage difference between the gate and source of the driving transistor T2, namely V GS The duration of the bias is adjusted to eliminate the influence of the hysteresis effect on the flicker phenomenon.

[0062] The step S130 includes: S131, in response to the display brightness value being less than a first preset threshold, reducing the pulse width of the first scanning signal; and / or S132, in response to the display brightness value being greater than or equal to the first preset threshold, increasing the pulse width of the first scanning signal.

[0063] Specifically, refer to Figures 5 and 6. Figure 5 is a schematic diagram of the working timing of the second scanning signal EN corresponding to low brightness and the V of the driving transistor T2. GS FIG6 is a schematic diagram of the state change of the second scanning signal EN corresponding to the high brightness condition and the V of the driving transistor T2. GSReferring to Figure 5, when EN jumps from low level to high level, it will couple with point N2 on T2, and the potential of point N2 will be pulled up, so that the voltage difference between the gate and source of the driving transistor T2, that is, V GS In the positive state. Then the time EN is in the high level is the same as T2's V GS The duration of the positive state remains the same. Comparing Figure 5 and Figure 6, we can see that under low brightness conditions, the V GS The duration 51 in the positive state is greater than the V of the driving transistor T2 in the high brightness condition. GS The duration of the positive state is 52. That is, when the preset data signal DATA is equal, under different display brightness, that is, in each frame period, the hysteresis effect under low display brightness and high display brightness is inconsistent, which will cause the flicker problem of each frame display.

[0064] When the high level ratio of the second scan signal EN and the first scan signal S n+1 When the pulse width ratio is set appropriately, the brightness change trend within a frame will tend to be stable. At this time, when frequency switching is performed, the human eye will not notice screen flickering. However, with DBV dimming, it is necessary to adjust the high level ratio of the second scan signal EN to adjust the brightness, so it will result in different DBV dimming brightness. When watching at a fixed brightness, there will be no flickering. Therefore, in order to achieve no flickering at all brightness levels, it is necessary to adjust the first scan signal S under different EN signal high level ratios. n+1 Pulse width ratio. As shown in Figure 7, when the brightness change trend within a frame is inconsistent, the brightness changes when switching from 30Hz to 60Hz, and the screen will flicker. As shown in Figure 8, when the brightness change trend within a frame is consistent, the brightness does not change when switching from 30Hz to 60Hz, and the screen will not flicker.

[0065] The low brightness is a brightness less than the first preset threshold, and the high brightness is a brightness greater than or equal to the first preset threshold. For example, the first preset threshold may be 50 nit, but the present invention is not limited thereto.

[0066] FIG. 9 shows the second scanning signal EN and the first scanning signal S before adjustment in two adjacent frames under low brightness conditions. n+1 FIG10 is a diagram showing the working timing of the second scanning signal EN and the first scanning signal S before adjustment in two adjacent frames under high brightness conditions. n+1 Schematic diagram of the working sequence of FIG. Among them, the first scanning signal S under low brightness and high brightness conditions before adjustment n+1 FIG11 shows the second scanning signal EN and the adjusted first scanning signal S in two adjacent frames under low brightness. n+1FIG12 is a schematic diagram of the working timing of the second scanning signal EN and the adjusted first scanning signal S in two adjacent frames under high brightness conditions. n+1 Working timing diagram.

[0067] Comparing FIG9 and FIG11, it can be seen that the embodiment of the present invention reduces the first scanning signal S under low brightness conditions. n+1 The working time in the high level state is shortened, that is, the first scanning signal S n+1 The pulse width of the first scanning signal S increases the working time of the first scanning signal S in the low level state, that is, the time when T1 is turned on increases. n+1 The controlled transistor T1 can be used to reset the potential of the first node N1, so that the time for resetting the potential of the N1 point becomes longer, and the time for the potential of the N1 point to be pulled high becomes longer, which can make the V of the driving transistor T2 lower under low brightness conditions. GS The time in the positive state is shortened, which increases the V of the driving transistor T2. GS The duration of the negative state reduces the impact of the hysteresis effect of T2 on flicker in low brightness conditions.

[0068] Comparing FIG10 and FIG12, it can be seen that the embodiment of the present invention increases the first scanning signal S under low brightness conditions. n+1 The working time in the high level state increases the first scanning signal S n+1 The pulse width is shortened, and the working time in the low level state is shortened, that is, the time when T1 is turned on is shortened. Similar to the above principle, this can shorten the time when the potential of point N1 is pulled high, so that the V of the driving transistor T2 is GS The time in the positive state increases, which reduces the V of the driving transistor T2. GS The duration of the negative state reduces the impact of the hysteresis effect of T2 on flicker under high brightness conditions.

[0069] On the other hand, since the first scanning signal S n+1 When not adjusted, the hysteresis effect of T2 in low brightness conditions and high brightness conditions has different effects on the brightness changes within a frame, further affecting the flicker phenomenon. The above-mentioned embodiment of the present invention makes the hysteresis effect of T2 in low brightness conditions and high brightness conditions tend to be consistent, which is further beneficial to improving the flicker problem and enhancing the display effect.

[0070] In this embodiment, the third pulse width of the second scanning signal EN corresponding to the first display brightness value is greater than the fourth pulse width of the second scanning signal EN corresponding to the second display brightness value. In other words, the third pulse width of the second scanning signal EN corresponding to low brightness is greater than the fourth pulse width of the second scanning signal EN corresponding to high brightness.

[0071] As can be seen from FIG. 11 and FIG. 12 , in this embodiment, when the first scanning signal S n+1 When the second scan signal EN is at an active level, the second scan signal EN is at an inactive level; and when the second scan signal EN is at an active level, the first scan signal S n+1 Invalid level.

[0072] As can be seen from the above disclosure, the pixel driving circuit disclosed in the embodiment corresponding to FIG. 3 of the present invention adds an eighth switch device T8 at the first node N1, so that when the second scanning signal EN is at a high level and the first scanning signal S n+1 When the voltage is low, the first switch device T1 is turned on, and the transmission path of the first reference voltage signal VINT1 is: transmitted to the first node N1 through the first switch device T1, so that the potential of the N1 point is reset to the voltage corresponding to the first reference voltage signal VINT1. In this embodiment, the potential polarity of the first reference voltage signal VINT1 is a positive voltage, so that the voltage difference between the gate and the source of the driving transistor in each frame period under low brightness is T2_V GS The positive bias time is shortened, and the positive bias time of the voltage difference between the gate and source of the driving transistor in each frame period under high brightness conditions is increased. This can weaken the influence of the hysteresis effect of the second switching device T2, that is, the driving transistor on the flicker, and make the hysteresis effect under different brightness conditions tend to be consistent, thereby improving the low-frequency flicker problem of the display panel and enhancing the display effect.

[0073] An embodiment of the present invention further discloses a display panel, which includes the pixel driving circuit disclosed in any of the above embodiments. The detailed structural features and advantages of the pixel driving circuit can be found in the description of the above embodiments and will not be repeated here.

[0074] In an optional embodiment, the display panel has multiple light-emitting elements. The solution of the present application can improve the problem of uneven display caused by uneven brightness of the multiple light-emitting elements, reduce the visual flicker, and thus improve the display effect.

[0075] Some embodiments of the present disclosure further provide a display device, which includes the above-mentioned display panel.

[0076] The display device provided by the embodiments of the present disclosure can be any device that displays an image, whether in motion (e.g., video) or fixed (e.g., still image), and whether text or text. More specifically, it is expected that the above embodiments can be implemented in or associated with a variety of electronic devices. The above-mentioned various electronic devices are, for example, (but not limited to) mobile phones, wireless devices, personal data assistants (PDAs), handheld or portable computers, GPS receivers / navigators, cameras, MP4 video players, cameras, game consoles, watches, clocks, calculators, television monitors, flat-panel displays, computer monitors, car displays (e.g., odometer displays, etc.), navigators, cockpit controls and / or displays, displays of camera views (e.g., displays of rearview cameras in vehicles), electronic photos, electronic billboards or signs, projectors, architectural structures, packaging and aesthetic structures, etc.

[0077] In summary, the pixel driving method and driving circuit, display panel, and display device of the present invention have at least the following advantages:

[0078] The pixel driving method and driving circuit, display panel, and display device disclosed in the embodiments of the present invention adjust the pulse width of the first scanning signal according to the display brightness value of the display panel, and input the adjusted first scanning signal into the first initialization module to adjust the working time during which the voltage difference between the gate and the source of the driving transistor is in a positive state, thereby reducing the influence of the hysteresis effect of the driving transistor on the flicker problem under low-frequency driving conditions, thereby improving the low-frequency flicker problem of OLED display products and enhancing their display effect.

[0079] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A pixel driving method, characterized in that: Applied to a pixel driving circuit, the pixel driving circuit comprises a first initialization module and a light-emitting driving module connected to each other, the first initialization module and the light-emitting driving module are connected to form a first node, the first initialization module is used to initialize the potential of the first node; the light-emitting driving module is used to drive the light-emitting element to emit light; the first initialization module is connected to a first scanning signal; the method comprises the following steps: providing a display panel; Acquiring a display brightness value of the display panel; According to the display brightness value, adjusting the pulse width of the first scanning signal; wherein a first pulse width corresponding to the first display brightness value is less than a second pulse width corresponding to the second display brightness value, the first display brightness value is less than a first preset threshold value, and the second display brightness value is greater than or equal to the first preset threshold value; determining the first scanning signal according to the adjusted pulse width; The first scanning signal is input to the first initialization module.

2. The pixel driving method according to claim 1, characterized in that: The step of adjusting the pulse width of the first scanning signal according to the display brightness value includes: In response to the display brightness value being less than a first preset threshold, reducing a pulse width of the first scanning signal; In response to the display brightness value being greater than or equal to a first preset threshold, the pulse width of the first scanning signal is increased.

3. The pixel driving method according to claim 1, wherein: The light-emitting driving module includes a driving transistor; the driving transistor is connected to the first initialization module to form the first node; and the pulse width of the first scanning signal is adjusted according to the display brightness value, including: In response to the display brightness value being less than a first preset threshold, reducing the duration during which the voltage difference between the gate and the source of the driving transistor is in a positive state; In response to the display brightness value being greater than or equal to a first preset threshold, the duration during which the voltage difference between the gate and the source of the driving transistor is in a positive state is increased.

4. The pixel driving method according to claim 2, wherein: The pixel driving circuit further includes a reset transistor connected to the anode of the light emitting element; and adjusting the pulse width of the first scanning signal according to the display brightness value includes: Inputting an initial reset signal having a period of a frame period into the reset transistor; Obtaining a delayed light emission time of a sub-pixel of the display panel in response to the initial reset signal; The pulse width of the first scanning signal is adjusted until the frequency of brightness delay caused by the delayed light emission time is not visible.

5. The pixel driving method according to claim 1, wherein: The first initialization module includes a first switch device, a first electrode of the first switch device is connected to a first reference voltage signal, a second electrode is connected to the light-emitting driving module, a third electrode of the first switch device is connected to the first scanning signal, and the third electrode is a gate.

6. The pixel driving method according to claim 1, wherein: The light-emitting driving module further includes a third switching device and a fourth switching device, and a gate of the third switching device and a gate of the fourth switching device are both connected to a second scanning signal.

7. The pixel driving method according to claim 6, wherein: A third pulse width of the second scanning signal corresponding to the first display brightness value is greater than a fourth pulse width of the second scanning signal corresponding to the second display brightness value.

8. The pixel driving method according to claim 6, wherein: When the first scanning signal is at an effective level, the second scanning signal is at an ineffective level; and when the second scanning signal is at an effective level, the first scanning signal is at an ineffective level.

9. A pixel driving circuit, characterized in that: The pixel driving circuit comprises a first initialization module and a light-emitting driving module connected to each other, wherein the first initialization module is used to initialize the potential of the first node, and the light-emitting driving module is used to drive the light-emitting element to emit light; The first initialization module is connected to a first scanning signal, and a pulse width of the first scanning signal is adjusted based on the pixel driving method according to any one of claims 1 to 8.

10. A display panel, characterized in that: The display panel comprises the pixel driving circuit as claimed in claim 9.

11. A display device, characterized in that: Comprising the display panel according to claim 10.

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