Display panel and control method, device, electronic device and storage medium thereof

Abstract

The present invention discloses a display panel and its control method, device, electronic device and storage medium. The control method includes at least two refresh rates; the light-emitting duration of the display panel is controlled by a light-emitting control signal, the light-emitting control signal jumps between a first level and a second level, and the first level can control the light-emitting device to light up; the duty cycle of the light-emitting control signal is defined as the ratio of the first level to the sum of the first level and the second level; wherein the duty cycles of the light-emitting control signals corresponding to the at least two refresh rates are different when the refresh rate is switched, so as to reduce the brightness difference of the display panel when the refresh rate is switched. Compared with the prior art, the embodiment of the present invention improves the flickering problem when the refresh rate is switched, and improves the display quality of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a control method, device, electronic device and storage medium thereof. Background Art

[0002] With the continuous development of display technology, people have higher and higher requirements for various performances of display panels, such as low power consumption and high display quality. In the prior art, low power consumption of the display panel can be achieved by reducing the refresh rate, and high display quality of the display panel can be achieved by increasing the refresh rate. In order to achieve both low power consumption and high display quality, the prior art adopts a technical solution that is compatible with low refresh rate and high refresh rate. When the display panel has low requirements for image quality, a low refresh rate is used to reduce power consumption; when the display panel has high requirements for image quality, a high refresh rate is used to improve display quality. However, when the refresh rate of the display panel is switched, there is a flickering problem. Summary of the invention

[0003] The present invention provides a display panel and a control method, device, electronic device and storage medium thereof, so as to improve the flicker problem when the refresh rate is switched and enhance the display quality of the display panel.

[0004] According to one aspect of the present invention, a control method for a display panel is provided, comprising at least two refresh rates; the light-emitting duration of the display panel is controlled by a light-emitting control signal, the light-emitting control signal jumps between a first level and a second level, and the first level can control the light-emitting device to light up; the duty cycle of the light-emitting control signal is defined as the ratio of the first level to the sum of the first level and the second level;

[0005] Among them, the duty cycles of the light emitting control signals corresponding to the at least two refresh rates are controlled to be different when the refresh rates are switched, so as to reduce the brightness difference of the display panel when the refresh rates are switched.

[0006] Optionally, the at least two refresh rates include a first refresh rate and a second refresh rate, the first refresh rate corresponds to a first duty cycle of the light emitting control signal, and the second refresh rate corresponds to a second duty cycle of the light emitting control signal.

[0007] Optionally, a method for determining duty cycles corresponding to different refresh rates includes:

[0008] At the first refresh rate, controlling the value of the first duty cycle, collecting the brightness of the display panel, and obtaining a first brightness L1;

[0009] Switching from the first refresh rate to the second refresh rate, controlling the value of the second duty cycle, collecting the brightness of the display panel, and obtaining a second brightness L2;

[0010] Obtaining a frequency-cut flicker value DL according to the first brightness L1 and the second brightness L2;

[0011] Adjusting the value of the first duty cycle and / or the second duty cycle until the frequency switching flicker value DL is within a preset range;

[0012] Preferably, DL=(L1-L2) / L1.

[0013] Optionally, when adjusting the value of the first duty cycle and / or the second duty cycle, the method further includes: keeping the first duty cycle unchanged and adjusting the value of the second duty cycle; wherein the first duty cycle is a system default value;

[0014] Preferably, the value of the second duty cycle is adjusted step by step starting from an initial value, and the initial value is the system default value.

[0015] Optionally, the second duty cycle remains unchanged, and the value of the first duty cycle is adjusted; wherein the second duty cycle is a system default value;

[0016] Preferably, the value of the first duty cycle is adjusted step by step starting from an initial value, and the initial value is the system default value.

[0017] Optionally, the second refresh rate is higher than the first refresh rate, and the second duty cycle is greater than the first duty cycle;

[0018] And / or, the second refresh rate is lower than the first refresh rate, and the second duty cycle is smaller than the first duty cycle.

[0019] Optionally, after the refresh rate is switched, the method further includes:

[0020] Adjusting the duty cycle of the light emitting control signal to a system default value;

[0021] Preferably, the process of adjusting the duty cycle of the light emitting control signal includes at least one frame.

[0022] Optionally, the duty cycle of the light emitting control signal is adjusted by adjusting a program of a scanning driving circuit;

[0023] Preferably, the duty cycle of the light emitting control signal is adjusted by adjusting the duty cycle of an initial input signal of the scan driving circuit.

[0024] Optionally, the refresh rate of the display panel includes at least one of 10 Hz, 30 Hz, 60 Hz, 90 Hz and 120 Hz.

[0025] According to another aspect of the present invention, a display panel is provided, which adopts the control method according to any embodiment of the present invention.

[0026] According to another aspect of the present invention, a control device for a display panel is provided, wherein the display panel includes at least two refresh rates; the light-emitting duration of the display panel is controlled by a light-emitting control signal, the light-emitting control signal jumps between a first level and a second level, and the first level can control the light-emitting device to light up; the duty cycle of the light-emitting control signal is defined as the ratio of the first level to the sum of the first level and the second level; comprising:

[0027] The control device includes a frequency switching control module, which is used to control the duty cycles of the light emitting control signals corresponding to the at least two refresh rates to be different when the refresh rates are switched, so as to reduce the brightness difference of the display panel when the refresh rates are switched.

[0028] According to another aspect of the present invention, a display panel is provided, which adopts the control method according to any embodiment of the present invention.

[0029] According to another aspect of the present invention, there is provided an electronic device, comprising:

[0030] at least one processor; and

[0031] a memory communicatively connected to the at least one processor; wherein,

[0032] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the display panel control method described in any embodiment of the present invention.

[0033] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the display panel control method described in any embodiment of the present invention when executed.

[0034] The embodiment of the present invention controls at least two refresh rates so that the duty cycles of the corresponding light control signals are different when the refresh rates are switched, and can fine-tune the brightness of the display panel when the refresh rate is switched as needed to reduce the brightness difference of the display panel when the refresh rate is switched, thereby improving the flicker problem when the refresh rate is switched and improving the display quality of the display panel. In addition, the embodiment of the present invention does not need to adjust the control logic that affects the data voltage, such as the grayscale and gamma of the display panel, but only needs to adjust the duty cycle of the light control signal. The design idea is ingenious, the implementation method is simple, and the stability is good.

[0035] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic diagram of a light emitting control signal provided by an embodiment of the present invention;

[0038] Figure 2 A schematic flow chart of a method for controlling a display panel provided by an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0040] Figure 4 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention;

[0041] Figure 5 A waveform diagram showing a gate voltage changing with leakage duration provided by an embodiment of the present invention;

[0042] Figure 6 A schematic diagram of grayscale brightness change provided by an embodiment of the present invention;

[0043] Figure 7 A schematic diagram of another light emitting control signal provided by an embodiment of the present invention;

[0044] Figure 8 A schematic diagram of another light emitting control signal provided by an embodiment of the present invention;

[0045] Fig. 9 A schematic flow chart of a method for determining duty cycles corresponding to different refresh rates provided by an embodiment of the present invention;

[0046] Fig.10 A schematic flow chart of another method for controlling a display panel provided by an embodiment of the present invention;

[0047] Fig.11 A schematic structural diagram of a scan drive circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] An embodiment of the present invention provides a control method for a display panel, which is applicable to at least two refresh rate conditions. In the control process of the display panel, there is switching of different refresh rates. The luminous duration of the display panel is controlled by a luminous control signal, and the luminous control signal jumps between a first level and a second level. The first level can control the lighting of the light-emitting device, that is, the first level is an effective level; the duty cycle of the luminous control signal is defined as the ratio of the first level to the sum of the first level and the second level. Among them, the duty cycles of the luminous control signals corresponding to at least two refresh rates are different when the refresh rates are switched, so as to reduce the brightness difference of the display panel when the refresh rates are switched.

[0051] Optionally, the refresh rate of the display panel may be 10 Hz, 30 Hz, 60 Hz, 90 Hz, 120 Hz, a refresh rate lower than 10 Hz, or a refresh rate higher than 120 Hz. The display panel can switch between the above refresh rates, for example, from 60 Hz to 90 Hz, from 90 Hz to 60 Hz, from 60 Hz to 120 Hz, or from 120 Hz to 60 Hz, etc.

[0052] Figure 1 A schematic diagram of a light emitting control signal provided by an embodiment of the present invention. Figure 1, exemplarily, the light-emitting control signal EM jumps between high and low levels, the first level VL is a low level, and the second level VH is a high level. The duration of the first level VL is tEM1, the duration of the second level VH is tEM2, and the duty cycle of the light-emitting control signal duty = tEM1 / (tEM1+tEM2). The larger the duty cycle duty, the longer the low level duration of the light-emitting control signal, the longer the light-emitting time of the light-emitting device, resulting in a brighter overall brightness of the display panel; on the contrary, the smaller the duty cycle duty, the shorter the low level duration of the light-emitting control signal, the shorter the light-emitting time of the light-emitting device, resulting in a darker overall brightness of the display panel. For example, if the display panel flickers due to a sudden decrease in brightness when switching from 60Hz to 90Hz, the brightness of the display panel is increased by increasing the duty cycle of the light-emitting control signal corresponding to 90Hz.

[0053] Therefore, the embodiment of the present invention controls at least two refresh rates so that the duty cycles of the corresponding light control signals are different when the refresh rates are switched, and can fine-tune the brightness of the display panel when the refresh rate is switched as needed to reduce the brightness difference of the display panel when the refresh rate is switched, thereby improving the flicker problem when the refresh rate is switched and improving the display quality of the display panel. In addition, the embodiment of the present invention does not need to adjust the control logic that affects the data voltage, such as the grayscale and gamma of the display panel, but only needs to adjust the duty cycle of the light control signal. The design idea is ingenious, the implementation method is simple, and the stability is good.

[0054] The above is the core inventive concept of the present invention. The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0055] In one embodiment of the present invention, optionally, the at least two refresh rates include a first refresh rate and a second refresh rate, the first refresh rate corresponds to a first duty cycle duty1 of the light emitting control signal, and the second refresh rate corresponds to a second duty cycle duty2 of the light emitting control signal. Figure 2 A flow chart of a method for controlling a display panel provided by an embodiment of the present invention. Figure 2 , the control method of the display panel comprises the following steps:

[0056] S110 , controlling the display panel to display at a first refresh frequency, and the duty cycle of the light emitting control signal is a first duty cycle duty1 .

[0057] S120, controlling the display panel to switch from the first refresh rate to the second refresh rate; and when the refresh rate is switched, adjusting the duty cycle of the light emitting control signal from the first duty cycle duty1 to the second duty cycle duty2.

[0058] The first refresh rate can be any one of 10Hz, 30Hz, 60Hz, 90Hz and 120Hz, and the second refresh rate can be any one except the first refresh rate. No matter how the refresh rate changes, it can be summarized into two cases. One case is that the second refresh rate is higher than the first refresh rate; the other case is that the second refresh rate is lower than the first refresh rate. The following is a detailed description of these two cases.

[0059] In order to facilitate understanding of the technical solution of the present invention, the working principle of the pixel circuit is first described by taking the structure of a specific pixel circuit as an example. Figure 3 A schematic diagram of a pixel circuit provided by an embodiment of the present invention. Figure 3 The pixel circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7 and a storage capacitor Cst. The pixel circuit also includes a first scan line providing a first scan signal Scan1, a second scan line providing a second scan signal Scan2, a third scan line providing a third scan signal Scan3, a light emitting control signal line providing a light emitting control signal EM, a reference voltage signal line providing a reference voltage signal Vrefn, a data line providing a data signal Data, a first power line providing a first power source ELVDD and a second power line providing a second power source ELVSS.

[0060] Among them, the first transistor T1 is a driving transistor, the second transistor T2 is a data writing transistor, the third transistor T3 is a threshold compensation transistor, the fourth transistor T4 is a gate initialization transistor, the fifth transistor T5 and the sixth transistor T6 are light emitting control transistors, and the seventh transistor T7 is an anode initialization transistor. Exemplarily, each transistor is a P-type transistor, the first electrode S of the first transistor T1 is a source electrode, and the second electrode D of the first transistor T1 is a drain electrode.

[0061] The gate of the second transistor T2 is connected to the second scanning signal Scan2, the first electrode of the second transistor T2 is connected to the first electrode S of the first transistor T1, and the second electrode of the second transistor T2 is connected to the data signal Data; the gate of the third transistor T3 is connected to the second scanning signal Scan2, the first electrode of the third transistor T3 is connected to the second electrode D of the first transistor T1, and the second electrode of the third transistor T3 is connected to the gate G of the first transistor T1; the gate of the fourth transistor T4 is connected to the first scanning signal Scan1, the first electrode of the fourth transistor T4 is connected to the gate G of the first transistor T1, and the second electrode of the fourth transistor T4 is connected to the reference voltage signal Vrefn; the gate of the fifth transistor T5 is connected to the second scanning signal Scan2, the first electrode of the third transistor T3 is connected to the second electrode D of the first transistor T1, and the second electrode of the third transistor T3 is connected to the gate G of the first transistor T1, and the second electrode of the fourth transistor T4 is connected to the reference voltage signal Vrefn; The light emitting control signal EM is connected, the first electrode of the fifth transistor T5 is connected to the first electrode S of the first transistor T1, and the second electrode of the fifth transistor T5 is connected to the first power supply ELVDD; the gate of the sixth transistor T6 is connected to the light emitting control signal EM, the first electrode of the sixth transistor T6 is connected to the second electrode D of the first transistor T1, and the second electrode of the sixth transistor T6 is connected to the anode of the light emitting device OLED; the gate of the seventh transistor T7 is connected to the third scanning signal Scan3, the first electrode of the seventh transistor T7 is connected to the anode of the light emitting device OLED, and the second electrode of the seventh transistor T7 is connected to the reference voltage signal Vrefn; the cathode of the light emitting device OLED is connected to the second power supply ELVSS.

[0062] Figure 4 A driving timing diagram of a pixel circuit provided by an embodiment of the present invention. Figure 4 , the driving timing includes two display frames (a first display frame fr1 and a second display frame fr2), and the timing of the light emitting control signal EM and each scanning signal (a first scanning signal Scan1, a second scanning signal Scan2 and a third scanning signal Scan3). In one embodiment, the period of the light emitting control signal EM remains unchanged, and the period of the scanning signal is adjusted according to the change of the refresh rate. Exemplarily, the change period of the light emitting control signal EM is consistent with the minimum refresh rate of the display panel.

[0063] The working process of the pixel circuit in one display frame includes a gate initialization phase t1, a data writing phase t2, an anode initialization phase t3 and a light emitting phase t4.

[0064] In the initialization phase t1, the light-emitting control signal EM, the second scanning signal Scan2 and the third scanning signal Scan3 are all at high levels, and the first scanning signal Scan1 is at a low level. The light-emitting control signal EM controls the fifth transistor T5 and the sixth transistor T6 to be turned off; the second scanning signal Scan2 controls the second transistor T2 and the third transistor T3 to be turned off; the third scanning signal Scan3 controls the seventh transistor T7 to be turned off. The first scanning signal Scan1 controls the fourth transistor T4 to be turned on, and the reference voltage signal Vrefn initializes the gate G of the first transistor T1 (driving transistor), ensuring that the first transistor T1 (driving transistor) is in a conducting state in the data writing phase t2.

[0065] In the data writing stage t2, the light-emitting control signal EM, the first scanning signal Scan1 and the third scanning signal Scan3 are all at high levels, and the second scanning signal Scan2 is at a low level. The light-emitting control signal EM controls the fifth transistor T5 and the sixth transistor T6 to be turned off; the first scanning signal Scan1 controls the fourth transistor T4 to be turned off; and the third scanning signal Scan3 controls the seventh transistor T7 to be turned off. The second scanning signal Scan2 controls the second transistor T2 and the third transistor T3 to be turned on, so as to write the data signal Data into the gate G of the first transistor T1 (driving transistor) via the source S and the drain D of the first transistor T1 (driving transistor).

[0066] In the anode initialization stage t3, the light emitting control signal EM, the first scanning signal Scan1 and the second scanning signal Scan2 are all at high level, and the third scanning signal Scan3 is at low level. The light emitting control signal EM controls the fifth transistor T5 and the sixth transistor T6 to be turned off; the first scanning signal Scan1 controls the fourth transistor T4 to be turned off; the second scanning signal Scan2 controls the second transistor T2 and the third transistor T3 to be turned off. The third scanning signal Scan3 controls the seventh transistor T7 to be turned on, so that the reference voltage signal Vrefn initializes the anode of the light emitting device OLED.

[0067] In the light-emitting stage t4, the first scanning signal Scan1, the second scanning signal Scan2 and the third scanning signal Scan3 are all at high levels. The light-emitting control signal EM is at a low level or presents periodic changes, which is not limited by the present invention. The first scanning signal Scan1 controls the fourth transistor T4 to be disconnected; the second scanning signal Scan2 controls the second transistor T2 and the third transistor T3 to be disconnected; the third scanning signal Scan3 controls the seventh transistor T7 to be disconnected. When the light-emitting control signal EM controls the fifth transistor T5 and the sixth transistor T6 to be turned on, the first transistor T1 (driving transistor) generates a driving current, which flows into the anode of the light-emitting device OLED, driving the light-emitting device OLED to emit light. Then, in the light-emitting stage, the driving current Id generated by the first transistor T1 (driving transistor) is:

[0068]

[0069] Where W is the channel width, L is the channel length, μ is the electron mobility, and C ox is the channel capacitance per unit area, Vth is the threshold voltage, and these physical quantities are constants. The magnitude of the driving current Id is determined by the gate voltage Vg of the first transistor T1, so the brightness of the light-emitting device OLED is determined by the gate voltage Vg of the first transistor T1, and the more stable the gate voltage Vg is, the more stable the brightness of the light-emitting device OLED is.

[0070] However, the working characteristics of the transistors in the pixel circuit are not in an ideal state, and leakage occurs between the source and the drain. Specifically, the leakage problem of the third transistor T3 and the fourth transistor T4 will cause the voltage of the gate G of the first transistor T1 to deviate. For example, when the third transistor T3 leaks, due to the influence of the reference voltage signal Vrefn, the gate voltage Vg of the first transistor T1 decreases, thereby increasing the driving current Id and raising the brightness of the light-emitting device OLED.

[0071] The change in gate voltage Vg is related to the leakage duration. The longer the leakage duration is, the greater the change in gate voltage Vg is. Figure 5 A waveform diagram showing the change of gate voltage with leakage duration provided by an embodiment of the present invention. Figure 5 , the horizontal axis is time, and the vertical axis is the gate voltage Vg of the first transistor T1. The refresh rates of waveform L1 and waveform L2 are different, and the leakage duration is also different. The refresh rate of waveform L1 is 60Hz, and the duration of one frame fr1 is 8.3ms; the refresh rate of waveform L2 is 120Hz, and the duration of one frame fr2 is 16.6ms. Therefore, the leakage duration corresponding to 60Hz is approximately twice the leakage duration corresponding to 120Hz. Figure 5 It can be seen that the lower the refresh rate and the longer the leakage time, the lower the gate voltage Vg of the first transistor T1, and the higher the brightness of the light-emitting device OLED. Due to the brightness difference of the light-emitting device caused by different refresh rates, the display panel has a flickering problem when switching the refresh rate.

[0072] Figure 6 A schematic diagram of grayscale brightness change provided by an embodiment of the present invention. Figure 6, the horizontal axis is grayscale; the vertical axis is the percentage of brightness Lv. The embodiment of the present invention takes 120Hz brightness as the reference, and the vertical axis is expressed as Lv / Lv120. The refresh rate of waveform L3 is 120Hz, and its vertical axis remains 100% at each grayscale; the refresh rate of waveform L4 is 90Hz, and its vertical axis shows a trend of rising from 100% at each grayscale; the refresh rate of waveform L4 is 60Hz, and its vertical axis is completely higher than 100% at each grayscale. Figure 6 It can be seen that the lower the refresh rate, the higher the overall brightness of the display panel.

[0073] In view of the above research, the embodiments of the present invention further define the adjustment method of the duty cycle of the light emitting control signal under different circumstances.

[0074] Figure 7 A schematic diagram of another light emitting control signal provided by an embodiment of the present invention. Figure 7 In one embodiment, optionally, the second refresh rate is higher than the first refresh rate, and the second duty cycle duty2 is greater than the first duty cycle duty1. Wherein, the first duty cycle duty1 = tEM1 / (tEM1+tEM2), and the second duty cycle duty2 = tEM1' / (tEM1'+tEM2'). Exemplarily, the second refresh rate is 90Hz, and the first refresh rate is 60Hz. When the display panel switches from 60Hz to 90Hz, the brightness of the display panel will suddenly dim. At this time, by increasing the duty cycle of the light-emitting control signal EM, the light-emitting time of the light-emitting device can be appropriately extended, thereby increasing the brightness of the display panel, compensating for the light-emitting time, and then buffering the brightness difference caused by frequency cutting.

[0075] Figure 8 A schematic diagram of another light emitting control signal provided by an embodiment of the present invention. Figure 8 In another embodiment, optionally, the second refresh rate is lower than the first refresh rate, and the second duty cycle duty2 is smaller than the first duty cycle duty1. Wherein, the first duty cycle duty1=tEM1 / (tEM1+tEM2), and the second duty cycle duty2=tEM1' / (tEM1'+tEM2'). Exemplarily, the second refresh rate is 60Hz, and the first refresh rate is 90Hz. When the display panel switches from 90Hz to 60Hz, the brightness of the display panel will suddenly become brighter. At this time, by reducing the duty cycle of the light-emitting control signal EM, the light-emitting time of the light-emitting device can be appropriately shortened, thereby reducing the brightness of the display panel, thereby buffering the brightness difference caused by frequency cutting.

[0076] It should be noted that in the control method of the display panel, the duty cycle of the light-emitting control signal can be adjusted only when the low frequency is switched to the high frequency, the duty cycle of the light-emitting control signal can be adjusted only when the high frequency is switched to the low frequency, or the duty cycle of the light-emitting control signal can be adjusted in both cases, and the present invention does not limit this. As can be seen from the above analysis, at a low refresh rate, the brightness of the display panel is significantly increased, and the instantaneous flickering when switching to a high refresh rate is more obvious. Therefore, it is preferred to adjust the duty cycle of the light-emitting control signal when the low frequency is switched to the high frequency. The scheme of adjusting the duty cycle of the light-emitting control signal when the high frequency is switched to the low frequency is an optional scheme.

[0077] On the basis of the above embodiments, the embodiment of the present invention further provides a method for determining a specific value of the duty cycle of the light emitting control signal, which is described in detail below.

[0078] Fig. 9 A flow chart of a method for determining duty cycles corresponding to different refresh rates provided by an embodiment of the present invention. Fig. 9 In one embodiment, optionally, a method for determining duty cycles corresponding to different refresh rates includes the following steps:

[0079] S210 . At a first refresh rate, control the value of a first duty cycle, collect the brightness of the display panel, and obtain a first brightness L1 .

[0080] Among them, a color analyzer can be used to collect the brightness of the display panel.

[0081] S220, switching from the first refresh rate to the second refresh rate, controlling the value of the second duty cycle, collecting the brightness of the display panel, and obtaining a second brightness L2.

[0082] The process of switching from the first refresh rate to the second refresh rate is continuous, and the color analyzer can continuously collect the brightness of the display panel and generate a waveform curve of the brightness, from which the first brightness L1 and the second brightness L2 are obtained.

[0083] S230 , obtaining a frequency-cut flicker value DL according to the first brightness L1 and the second brightness L2 .

[0084] Among them, the frequency-cutting flicker value DL represents the degree of brightness flicker of the display panel when the refresh rate is switched, and can be expressed by taking a quotient or a difference. Preferably, DL = (L1-L2) / L1. The larger the absolute value of the frequency-cutting flicker value DL, the more obvious the flicker phenomenon is, and the smaller the absolute value of the frequency-cutting flicker value DL, the better the flicker phenomenon is. A positive number of the frequency-cutting flicker value DL indicates that the brightness changes from bright to dark when the frequency is cut, and a negative number of the frequency-cutting flicker value DL indicates that the brightness changes from dark to bright when the frequency is cut.

[0085] S240, determining whether the frequency switching flicker value DL is within a preset range, if so, ending; otherwise, executing S250.

[0086] The setting of the preset range can be adjusted according to user needs. For example, the preset range is ±1%, ±2%, ±3%, ±4% or ±5%.

[0087] S250, adjusting the value of the first duty cycle and / or the second duty cycle, and repeatedly executing S210-S240.

[0088] The process of repeatedly executing S210 - S240 is actually the process of repeatedly executing the adjustment of the value of the first duty cycle and / or the second duty cycle until the frequency switching flicker value DL is within a preset range.

[0089] Through S210-S250, the specific value of the duty cycle of the light control signal is determined. This arrangement is simple in implementation and easy to implement. It is understandable that S210-S250 can be debugged before the display panel leaves the factory, and the duty cycle corresponding to each refresh rate switch is stored in the driver chip, which can be called during the use of the display panel.

[0090] In the above embodiments, there are multiple ways to implement the process of adjusting the value of the first duty cycle and / or the second duty cycle. In one embodiment, optionally, the first duty cycle remains unchanged, and only the value of the second duty cycle is adjusted; wherein the first duty cycle is a system default value. The system default value of the duty cycle of the light-emitting control signal can be understood as the duty cycle of the light-emitting control signal in the prior art. That is, before the duty cycle of the light-emitting control signal is adjusted, the duty cycle of the light-emitting control signal is the system default value. The embodiment of the present invention is configured in this way, which is equivalent to adjusting the duty cycle after the refresh rate is switched, thereby compensating for the light-emitting brightness and buffering the brightness difference caused by the refresh rate switching.

[0091] Furthermore, the value of the second duty cycle is adjusted in steps starting from an initial value, and the initial value is a system default value. By means of step-by-step adjustment, the brightness change trend of the display panel can be better grasped, which is conducive to improving the accuracy of the duty cycle adjustment, and the final value of the second duty cycle can be obtained with fewer steps. Exemplarily, when the second duty cycle is adjusted for the first time, if the frequency-cutting flicker value DL is a positive number and is greater than a preset range, it is necessary to increase the value of the second duty cycle by an adjustment amount △duty; after repeating the duty cycle adjustment n times, the value of the second duty cycle increases by n*△duty, and the frequency-cutting flicker value DL gradually decreases, and finally falls within the preset range.

[0092] Furthermore, the preset range is ±3%. When the value of the second duty cycle increases by n*△duty, the frequency cutting flicker value DL>+3%; when the value of the second duty cycle increases by (n+1)*△duty, the frequency cutting flicker value DL<-3%, it is necessary to reduce the value of the adjustment amount △duty and continue the step adjustment.

[0093] In another embodiment, the second duty cycle remains unchanged and the value of the first duty cycle is adjusted; wherein the second duty cycle is a system default value. The embodiment of the present invention is configured in this way, which is equivalent to adjusting the duty cycle before the refresh rate is switched, thereby compensating for the luminous brightness during the switching and buffering the brightness difference caused by the refresh rate switching.

[0094] Furthermore, the value of the first duty cycle is adjusted stepwise from an initial value, and the initial value is a system default value. The specific adjustment method of the first duty cycle is similar to the adjustment method of the second duty cycle in the above embodiment, and will not be repeated here.

[0095] In the above embodiments, the adjustment method of the duty cycle of the light control signal when the refresh rate is switched is described. After the refresh rate is switched, the brightness of the display panel returns to stability, and the duty cycle of the light control signal can continue to use the adjusted value or restore the system default value. Preferably, after the refresh rate is switched, the duty cycle of the light control signal is adjusted to the system default value.

[0096] For example, Fig.10 A flow chart of another method for controlling a display panel provided by an embodiment of the present invention. Fig.10 , the control method of the display panel comprises the following steps:

[0097] S110 , controlling the display panel to display at a first refresh frequency, and the duty cycle of the light emitting control signal is a first duty cycle duty1 ; wherein the first duty cycle duty1 is a system default value.

[0098] S120, controlling the display panel to switch from the first refresh rate to the second refresh rate; and when the refresh rate is switched, adjusting the duty cycle of the light emitting control signal from the first duty cycle duty1 to the second duty cycle duty2.

[0099] S130. After the refresh rate is switched, the duty cycle of the light emitting control signal is adjusted from the second duty cycle duty2 to the first duty cycle duty1, and the system default value is restored.

[0100] The embodiment of the present invention is configured in such a way that the duty cycle of the light emitting control signal is adjusted only when the refresh rate of the display panel is switched, which will not affect other display controls of the display panel, thereby further improving the stability of the display.

[0101] On the basis of the above embodiments, optionally, the process of adjusting the duty cycle of the light-emitting control signal includes at least one frame. That is, the process of switching the refresh rate includes at least one frame. Exemplarily, in the mth frame, the display panel is at the first refresh rate; and in the m+1th frame, the display panel is at the second refresh rate. The switching process of the refresh rate can be considered to be the m+1th frame, and the duty cycle of the light-emitting control signal is adjusted only in the m+1th frame. It can also be considered that the switching process of the refresh rate is from the m+1th frame to the m+pth frame, and the duty cycle of the light-emitting control signal is adjusted from the m+1th frame to the m+pth frame. Wherein, p is a positive integer greater than 1, and can be adjusted as needed in practical applications.

[0102] Based on the above embodiments, optionally, the duty cycle of the light emitting control signal is adjusted by adjusting the program of the scanning driving circuit. The light emitting control signal is provided by the scanning driving circuit, so the duty cycle of the light emitting control signal can be adjusted by adjusting the program of the scanning driving circuit.

[0103] Fig.11 A schematic diagram of the structure of a scan drive circuit provided by an embodiment of the present invention. Fig.11 In one embodiment of the present invention, optionally, the duty cycle of the light-emitting control signal is adjusted by adjusting the duty cycle of the initial input signal SIN of the scan drive circuit. The scan drive circuit includes a plurality of shift registers 10 connected in cascade, that is, the light-emitting control signal EM(i) output by the previous shift register 10 is used as the input signal IN of the current shift register 10. Under the control of the clock signal SCK1 and the clock signal SCK2, the shift register 10 can realize the shift output of the input signal IN, thereby generating light-emitting control signals EM(i) at various levels. The initial input signal SIN is the input signal of the first-stage shift register 10, and the waveform of the signal output by each shift register 10 is determined by the initial input signal SIN, that is, the duty cycle of the signal output by each shift register 10 is determined by the initial input signal SIN.

[0104] The embodiment of the present invention further provides a display panel, which can be any display panel whose light-emitting duration is controlled by a light-emitting control signal, such as an organic light-emitting diode display panel, a micro light-emitting diode display panel, and a light-emitting diode display panel. The display panel adopts the control method of the display panel provided in any embodiment of the present invention, and its technical principle and the effect produced are similar, and will not be repeated.

[0105] The embodiment of the present invention also provides a control device for a display panel. The display panel includes at least two refresh rates; the light-emitting duration of the display panel is controlled by a light-emitting control signal, the light-emitting control signal jumps between a first level and a second level, and the first level can control the light-emitting device to light up; the duty cycle of the light-emitting control signal is defined as the ratio of the first level to the sum of the first level and the second level.

[0106] The control device includes a frequency switching control module for controlling at least two refresh rates so that the duty cycles of the corresponding light control signals are different when the refresh rates are switched, so as to reduce the brightness difference of the display panel when the refresh rates are switched.

[0107] The control device of the display panel provided in the embodiment of the present invention can execute the control method of the display panel provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0108] Optionally, the at least two refresh rates include a first refresh rate and a second refresh rate, the first refresh rate corresponds to a first duty cycle of the light emitting control signal, and the second refresh rate corresponds to a second duty cycle of the light emitting control signal.

[0109] Preferably, the frequency cutting control module is further used to execute a method for determining duty cycles corresponding to different refresh rates, specifically including:

[0110] At a first refresh rate, the value of the first duty cycle is controlled, and the brightness of the display panel is collected to obtain a first brightness L1;

[0111] Switching from the first refresh rate to the second refresh rate, controlling the value of the second duty cycle, collecting the brightness of the display panel, and obtaining a second brightness L2;

[0112] According to the first brightness L1 and the second brightness L2, a frequency-cut flicker value DL is obtained;

[0113] The value of the first duty cycle and / or the second duty cycle is adjusted until the frequency switching flicker value DL is within a preset range.

[0114] Preferably, DL=(L1-L2) / L1.

[0115] Preferably, the second refresh rate is higher than the first refresh rate, and the second duty cycle is greater than the first duty cycle;

[0116] And / or, the second refresh rate is lower than the first refresh rate, and the second duty cycle is smaller than the first duty cycle.

[0117] Optionally, the frequency cutting control module is further configured to keep the first duty cycle unchanged and adjust the value of the second duty cycle when adjusting the value of the first duty cycle and / or the second duty cycle; wherein the first duty cycle is a system default value.

[0118] Preferably, the value of the second duty cycle is adjusted step by step starting from an initial value, and the initial value is a system default value.

[0119] Optionally, the second duty cycle remains unchanged, and the value of the first duty cycle is adjusted; wherein the second duty cycle is a system default value.

[0120] Preferably, the value of the first duty cycle is adjusted step by step starting from an initial value, and the initial value is a system default value.

[0121] Optionally, the frequency cutting control module is further used to adjust the duty cycle of the light emitting control signal to a system default value after the refresh rate is switched.

[0122] Preferably, the process of adjusting the duty cycle of the light emitting control signal includes at least one frame.

[0123] Preferably, the frequency cutting control module is further used to adjust the duty cycle of the light emitting control signal by adjusting the program of the scanning driving circuit.

[0124] Preferably, the duty cycle of the light emitting control signal is adjusted by adjusting the duty cycle of the initial input signal of the scan driving circuit;

[0125] Preferably, the refresh rate of the display panel includes at least one of 10 Hz, 30 Hz, 60 Hz, 90 Hz and 120 Hz.

[0126] An embodiment of the present invention also provides an electronic device. The electronic device is configured with a display panel, such as a laptop computer, a desktop computer, a workbench, a personal digital assistant, etc. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, and wearable devices (such as helmets, glasses, watches, etc.). The electronic device includes at least one processor, and a memory connected to at least one processor in communication, such as a read-only memory (ROM), a random access memory (RAM), etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) or the computer program loaded from the storage unit to the random access memory (RAM). In the RAM, various programs and data required for the operation of the electronic device can also be stored. The processor, ROM, and RAM are connected to each other via a bus. The input / output (I / O) interface is also connected to the bus. The processor can be a variety of general and / or special processing components with processing and computing capabilities, such as a driver chip.

[0127] In some embodiments, the control method of the display panel may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via a ROM and / or a communication unit. When the computer program is loaded into RAM and executed by a processor, one or more steps of the control method of the display panel described above may be performed. Alternatively, in other embodiments, the processor may be configured to execute the control method of the display panel by any other appropriate means (e.g., by means of firmware).

[0128] The computer program for implementing the method of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or the block diagram are implemented.

[0129] In an embodiment of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0130] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0131] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling a display panel, characterized in that: Including at least two refresh rates; the light-emitting duration of the display panel is controlled by a light-emitting control signal, the light-emitting control signal jumps between a first level and a second level, and the first level can control the light-emitting device to light up; defining the duty cycle of the light-emitting control signal as the ratio of the first level to the sum of the first level and the second level; The duty cycles of the light emitting control signals corresponding to the at least two refresh rates are controlled to be different when the refresh rates are switched, so as to reduce the brightness difference of the display panel when the refresh rates are switched; After the refresh rate is switched, it also includes: The duty cycle of the light emitting control signal is adjusted to a system default value.

2. The control method of the display panel according to claim 1, characterized in that: The at least two refresh rates include a first refresh rate and a second refresh rate, the first refresh rate corresponds to a first duty cycle of the light emitting control signal, and the second refresh rate corresponds to a second duty cycle of the light emitting control signal.

3. The control method of the display panel according to claim 2, characterized in that: The method for determining the duty cycle corresponding to different refresh rates includes: At the first refresh rate, controlling the value of the first duty cycle, collecting the brightness of the display panel, and obtaining a first brightness L1; Switching from the first refresh rate to the second refresh rate, controlling the value of the second duty cycle, collecting the brightness of the display panel, and obtaining a second brightness L2; Obtaining a frequency-cut flicker value DL according to the first brightness L1 and the second brightness L2; The value of the first duty cycle and / or the second duty cycle is adjusted until the frequency switching flicker value DL is within a preset range.

4. The control method of the display panel according to claim 3, characterized in that: DL=(L1-L2) / L1.

5. The control method of the display panel according to claim 3, characterized in that: The second refresh rate is higher than the first refresh rate, and the second duty cycle is greater than the first duty cycle; And / or, the second refresh rate is lower than the first refresh rate, and the second duty cycle is smaller than the first duty cycle.

6. The control method of the display panel according to claim 3, characterized in that: When adjusting the value of the first duty cycle and / or the second duty cycle, the method further includes: The first duty cycle remains unchanged, and the value of the second duty cycle is adjusted; wherein the first duty cycle is a system default value.

7. The control method of the display panel according to claim 6, characterized in that: The value of the second duty cycle is adjusted in steps starting from an initial value, and the initial value is the system default value.

8. The control method of the display panel according to claim 3, characterized in that: The second duty cycle remains unchanged, and the value of the first duty cycle is adjusted; wherein the second duty cycle is a system default value.

9. The control method of the display panel according to claim 8, characterized in that: The value of the first duty cycle is adjusted step by step starting from an initial value, and the initial value is the system default value.

10. The control method of the display panel according to claim 1, characterized in that: The process of adjusting the duty cycle of the light emitting control signal includes at least one frame.

11. The control method of the display panel according to claim 1, characterized in that: The duty cycle of the light emitting control signal is adjusted by adjusting the program of the scanning driving circuit.

12. The control method of the display panel according to claim 11, characterized in that: The duty cycle of the light emitting control signal is adjusted by adjusting the duty cycle of the initial input signal of the scan driving circuit.

13. The control method of the display panel according to claim 1, characterized in that: The refresh rate of the display panel includes at least one of 10 Hz, 30 Hz, 60 Hz, 90 Hz and 120 Hz.

14. A control device for a display panel, characterized in that: The display panel includes at least two refresh rates; the light-emitting duration of the display panel is controlled by a light-emitting control signal, the light-emitting control signal jumps between a first level and a second level, and the first level can control the light-emitting device to light up; the duty cycle of the light-emitting control signal is defined as the ratio of the first level to the sum of the first level and the second level; The control device includes a frequency switching control module, which is used to control the duty cycles of the light emitting control signals corresponding to the at least two refresh rates to be different when the refresh rates are switched, so as to reduce the brightness difference of the display panel when the refresh rates are switched; The frequency cutting control module is also used to adjust the duty cycle of the light emitting control signal to a system default value after the refresh rate is switched.

15. A display panel, characterized in that: A control method as claimed in any one of claims 1 to 13 is adopted.

16. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for controlling a display panel according to any one of claims 1 to 13.

17. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the control method of the display panel according to any one of claims 1 to 13 when executed.

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