Driving method of display panel, display panel and display device

Abstract

Embodiments of the present application provide a display panel driving method, a display panel and a display device, and relate to the field of display, to optimize the regulation of the light-emitting control signal and avoid the occurrence of flicker deterioration. The display panel has a first mode, and the driving period in the first mode includes an effective frame and a holding frame. The driving method includes: in the first mode, controlling the total light-emitting duration of the light-emitting control signal in two adjacent unit times in the driving period to satisfy: wherein the unit time includes at least one light-emitting period, the first unit time at least partially overlaps with the effective frame, N i and N i+1 are the total light-emitting durations of the light-emitting control signal in the i-th unit time and the i+1-th unit time, respectively, i≥1, and A is a critical percentage threshold of luminance change.

Description

[Technical Field]

[0001] This invention relates to the field of display technology, and more particularly to a driving method for a display panel, a display panel, and a display device. [Background Technology]

[0002] To improve brightness in display panels during low-frequency driving, which reduces flicker caused by transistor leakage, the duty cycle of the light emission control signal is typically adjusted while maintaining the frame. However, based on the current adjustment method, brightness fluctuations caused by changes in the duty cycle of the light emission control signal may actually exacerbate flicker, having the opposite effect. [Summary of the Invention]

[0003] In view of this, embodiments of the present invention provide a driving method for a display panel, a display panel, and a display device to optimize the regulation of the light emission control signal and avoid flickering degradation.

[0004] On one hand, embodiments of the present invention provide a driving method for a display panel, the display panel having a first mode, wherein the driving cycle in the first mode includes a valid frame and a hold frame;

[0005] The driving method includes: in the first mode, controlling the light emission control signal to have a total light emission duration of two adjacent unit time intervals in the driving cycle that satisfies: Wherein, the unit time includes at least one emission cycle, the first unit time at least partially overlaps with the effective frame, N i and N i+1 These are the total duration of light emission of the light emission control signal in the i-th unit time and the (i+1)-th unit time, respectively, where i≥1, and A is the critical percentage threshold for brightness change.

[0006] On the other hand, embodiments of the present invention provide a display panel that is driven by the above-described driving method.

[0007] In another aspect, embodiments of the present invention provide a display device including the aforementioned display panel.

[0008] One of the above technical solutions has the following beneficial effects:

[0009] In this embodiment of the invention, when setting a unit time, the first unit time at least partially overlaps with the effective frame. That is, it means that the total light emission duration N1 of the light emission control signal in the first unit time will cover the light emission duration of the light emission control signal in a single light emission cycle of the effective frame. Then, when the total light emission duration of the control signal in any two adjacent unit times satisfies Therefore, the adjustment of the total illumination duration of the illumination control signal in subsequent unit time periods can be considered as being based on the illumination duration of the illumination control signal in a single illumination cycle of the effective frame. Since the illumination duration of the illumination control signal in a single illumination cycle of the effective frame varies at different brightness levels, the technical solution provided by this embodiment of the invention can make targeted adjustments to the illumination control signal based on the current brightness level of the display panel. By further controlling the brightness fluctuation amplitude of the illumination control signal in any two adjacent unit time periods to be less than the critical brightness change percentage threshold A that the human eye can perceive as flicker, a gradual and small-scale increase in brightness can be achieved between adjacent unit time periods, avoiding the brightness fluctuation amplitude generated when the illumination control signal changes being perceived by the human eye.

[0010] Therefore, the driving method adopted in the embodiments of the present invention can avoid the flicker deterioration that occurs when improving flicker at different brightness levels. [Attached Image Description]

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a timing diagram of the light emission control signal in the prior art;

[0013] Figure 2 This is a timing diagram of the light emission control signals at different brightness levels in the prior art;

[0014] Figure 3 This is a schematic diagram of brightness fluctuation at different brightness levels in the prior art;

[0015] Figure 4 This is a timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0016] Figure 5 This is another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0017] Figure 6 This is another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0018] Figure 7 This is yet another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0019] Figure 8This is yet another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0020] Figure 9 This is yet another timing diagram of the light emission control signal provided in an embodiment of the present invention;

[0021] Figure 10 This is a schematic diagram of a display device provided in an embodiment of the present invention.

Detailed Implementation Methods

[0022] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0026] When the display panel is driven at low frequencies, the panel brightness will continue to decrease due to the leakage current of the transistors. This is especially true when driven at ultra-low frequencies such as 5Hz and 10Hz, where the brightness decay will be more severe.

[0027] Currently, panel brightness is typically increased by adjusting the duty cycle of the light emission control signal while maintaining the frame. For example... Figure 1 As shown, Figure 1This is a timing diagram of the Emit light emission control signal in the prior art. The driving cycle D of the display panel under low-frequency driving includes an effective frame aF and at least one hold frame kF. In the driving cycle D, the Emit light emission control signal with a duty cycle of a% is provided to the pixel circuit in the effective frame aF, so that the display panel has the target brightness. When the panel brightness decays to the brightness threshold, the duty cycle of the Emit light emission control signal can be adjusted from a% to b%, so that the light emission duration of the Emit light emission control signal in a single light emission cycle M is increased by Δt. That is, the pulse width of the effective level (shown as low level in this embodiment of the invention) in a single light emission cycle M is increased by Δt. Then, the positive influence of the increased light emission duration on the panel brightness is used to compensate for the decayed brightness, and the panel brightness is raised to near the target brightness.

[0028] However, during their research, the inventors discovered that current display panels generally have multiple brightness levels. For example, a higher brightness level can be matched to increase the overall brightness of the display in bright outdoor environments, while a lower brightness level can be matched to decrease the overall brightness of the display in dim indoor environments, allowing users to clearly see the image displayed on the panel in different application scenarios. At different brightness levels, the duty cycle of the emission control signal Emit in the effective frame aF differs. However, the above design only adjusts the duty cycle of the emission control signal Emit, without considering the different impacts on the panel brightness at different brightness levels caused by the increased emission duration in a single emission cycle M after the adjustment of the emission control signal Emit.

[0029] For example, such as Figure 2 and Figure 3 As shown, Figure 2 This is a timing diagram of the emission control signal Emit at different brightness levels in the prior art. Figure 3This diagram illustrates brightness fluctuations at different brightness levels in the prior art. The display panel has a first brightness level DBV-1 and a second brightness level DBV-2. The highest brightness at the first brightness level DBV-1 is greater than the highest brightness at the second brightness level DBV-2. When the display panel is at the higher first brightness level DBV-1, the emission control signal Emit has a longer emission duration t1 within a single emission cycle M of the effective frame aF. When the duty cycle of the emission control signal Emit is adjusted to increase the emission duration t1'(t1+Δt) within a single emission cycle M by Δt, the change in the adjusted emission duration t1'(t1+Δt) compared to the original emission duration t1 is not too large. This small brightness fluctuation generated before and after the adjustment of the emission control signal Emit can effectively raise the panel brightness to near the target brightness. However, when the display panel is switched to the lower second brightness level DBV-2, the emission duration t2 of the emission control signal Emit in a single emission cycle M of the effective frame aF is already small. Therefore, after adjusting the duty cycle of the emission control signal Emit to increase the emission duration t2 in a single emission cycle M by Δt, the adjusted emission duration t2'(t2+Δt) will change significantly compared to the original emission duration t2. This will cause a large brightness fluctuation before and after the adjustment of the emission control signal Emit. This brightness fluctuation will significantly exceed the target brightness, which will actually worsen the flickering phenomenon.

[0030] In particular, based on the current design of the emitter shift register circuit, when the emitter shift register circuit outputs the emitter control signal Emit, the duration of the emitter control signal Emit in a single emitter cycle M is an integer multiple of the line time (H), where the line time is one frame time divided by the number of pixel rows in the display panel. Furthermore, when the first-stage emitter shift register circuit drives one pixel row, after adjusting the duty cycle of the emitter control signal Emit, the change in the duration of the emitter control signal Emit in a single emitter cycle M must be an integer multiple of 2H, meaning the emitter duration must change by at least 2H; when the first-stage shift register circuit drives two pixel rows, after adjusting the duty cycle of the emitter control signal Emit, the change in the duration of the emitter control signal Emit in a single emitter cycle M must be an integer multiple of 4H, meaning the emitter duration must change by at least 4H.

[0031] Taking the change of 8H (Δt) in the duration of the emission control signal Emit in a single emission cycle M as an example, assuming that in the first brightness level DBV-1, the duration t1 of the emission control signal Emit in a single emission cycle M of the effective frame aF is 400H, after the duration of emission changes by 8H, the brightness increases by 2% with small fluctuations. However, when the brightness level is reduced to the second brightness level DBV-2, the duration t2 of the emission control signal Emit in a single emission cycle M of the effective frame aF is only 40H. Therefore, after the duration of emission changes by 8H, the brightness will increase by 20%, resulting in large brightness fluctuations.

[0032] Especially for display products with fewer pixel rows, such as watches, the duration of a single row is longer. After adjusting the duty cycle of the light emission duration, the change in the light emission duration of the light emission control signal Emit in a single light emission cycle M is greater, thus making the flickering problem more severe.

[0033] To address this, embodiments of the present invention provide a driving method for a display panel, such as... Figure 4 and Figure 5 As shown, Figure 4 This is a timing diagram of the Emit light emission control signal provided in an embodiment of the present invention. Figure 5 As an alternative timing diagram of the Emit control signal provided in an embodiment of the present invention, the display panel has a first mode, and the driving cycle D in the first mode includes an effective frame aF and a hold frame kF. This first mode can be a low-frequency driving mode, and the driving frequency of the display panel in the first mode can be 5Hz, 10Hz, 15Hz, 20Hz, 30Hz, 45Hz, 60Hz, etc.

[0034] The driving method includes: In the first mode, the total duration of light emission in two adjacent unit times T within the driving period D of the control signal Emit satisfies: Wherein, unit time T includes at least one emission period M, the first unit time T1 at least partially overlaps with the effective frame aF, and N i and N i+1 The emission control signal Emit is the emission control signal at the i-th unit time T. i and the (i+1)th unit time T i+1 The total duration of light emission within the range, i≥1, and A is the critical percentage threshold for brightness change.

[0035] Wherein, the emission period M is the period of one pulse in the emission control signal Emit. When the emission control signal Emit includes one emission period M, the total emission duration of the emission control signal Emit within a unit time T is the emission duration of the emission control signal Emit within that one emission period M; when the emission control signal Emit includes at least two emission periods M, the total emission duration of the emission control signal Emit within a unit time T is the sum of the emission durations of the emission control signal Emit within those at least two emission periods M. The emission duration of the emission control signal Emit within the emission period M corresponds to the pulse width of the effective level in the pulse of the emission control signal Emit.

[0036] The critical percentage threshold A for brightness change refers to the critical percentage threshold of brightness change that the human eye can detect flickering. For example, when the brightness is increased, if the percentage change of the increased brightness compared to the brightness before the increase reaches A, the brightness fluctuation can be detected by the human eye.

[0037] In this embodiment of the invention, when a unit time T is set, the first unit time T at least partially overlaps with the effective frame aF. That is, it means that the total light emission duration N1 of the light emission control signal Emit within the first unit time T will cover the light emission duration of the light emission control signal Emit within a single light emission period M of the effective frame aF. Then, when the total light emission duration of the light emission control signal Emit within any two adjacent unit times T satisfies... Therefore, the adjustment of the total illumination duration of the emission control signal Emit in each subsequent unit time T can be considered as being based on the illumination duration of the emission control signal Emit in a single illumination cycle M of the effective frame aF. As mentioned above, since the illumination duration of the emission control signal Emit in a single illumination cycle M of the effective frame aF differs at different brightness levels, the technical solution provided by this embodiment of the invention can make targeted adjustments to the emission control signal Emit based on the current brightness level of the display panel. By further controlling the brightness fluctuation amplitude of the emission control signal Emit within any two adjacent unit times T to be less than the critical brightness change percentage threshold A that the human eye can detect flicker, a gradual and small increase in brightness can be made between adjacent unit times T, avoiding the brightness fluctuation amplitude generated when the emission control signal Emit changes being detected by the human eye.

[0038] Therefore, the driving method adopted in the embodiments of the present invention can avoid the flicker deterioration that occurs when improving flicker at different brightness levels.

[0039] It should be noted that, in this embodiment of the invention, the adjustment of the emission control signal Emit can begin only when the panel brightness decays to the brightness threshold. That is, in this embodiment, the duty cycle of the emission control signal Emit does not necessarily begin to be adjusted within the second unit time T2. The emission control signal Emit may remain unchanged for the first few unit time Ts, and adjustment only begins in a later unit time T. However, it is understood that if the emission control signal Emit is not adjusted within the first few unit time Ts, the difference in the total emission duration of the emission control signal Emit between adjacent unit time Ts is 0, and the brightness fluctuation is also 0, thus satisfying the above requirements. The conditions are as follows. Alternatively, in embodiments of the present invention, the adjustment of the emission control signal Emit can begin in the second unit time T2, and the present invention does not impose specific limitations on this.

[0040] Furthermore, it should be noted that the number of holding frames kF included in the driving cycle D, the number of unit time T included in the driving cycle D, and the number of light emission cycles M included in the unit time T shown in the accompanying drawings of the embodiments of the present invention are merely illustrative and do not represent a specific limitation on these quantities.

[0041] In one feasible implementation, see again Figure 4 and Figure 5 The unit time T includes at least two emission cycles M.

[0042] As mentioned earlier, when the first-level emitter shift register circuit drives one pixel row, after adjusting the emitter control signal Emit, the emitter duration of the emitter control signal Emit in a single emitter cycle M must change by at least 2H. When the first-level shift register circuit drives two pixel rows, after adjusting the emitter control signal Emit, the emitter duration of the emitter control signal Emit in a single emitter cycle M must change by at least 4H.

[0043] For some lower brightness levels, the emission duration of the emission control signal Emit in a single emission period M of the effective frame aF is very short. Even if the emission duration of the emission control signal Emit changes by only 2H or 4H in a single emission period M after adjustment, it may not be possible to ensure that the total emission duration of the emission control signal Emit in two adjacent unit times T within the driving period D meets the requirements.

[0044] Taking the minimum change in the emission duration of the emission control signal Emit within a single emission cycle M as an example, assuming A = 3%, at a certain brightness level, the emission duration of the emission control signal Emit within a single emission cycle M of the effective frame aF is 100H. If the unit time T includes only one emission cycle M, after adjusting the duty cycle of the emission control signal Emit, even if the emission duration of the emission control signal Emit changes by only 4H in subsequent emission cycles M, the brightness fluctuation between the two unit times T will reach 4%, failing to meet the condition of less than 3%. However, if the unit time T is set to include two emission cycles M, the brightness fluctuation between the two unit times T can be controlled to 2% by adjusting the emission duration of the emission control signal Emit to change by 4H in one emission cycle M and not change in the emission duration of the other emission cycle M within the subsequent unit time T, thus meeting the condition of less than 3%.

[0045] Therefore, by setting the unit time T to at least two emission cycles M, the embodiments of the present invention can satisfy the above conditions for regulating the emission control signal Emit at more brightness levels, and bring more ways to regulate the emission control signal Emit.

[0046] When the unit time T includes at least two emission cycles M, in one feasible implementation, such as Figure 6 As shown, Figure 6 This is another timing diagram of the emission control signal Emit provided in an embodiment of the present invention, in which there is at least one overlap of emission period M between two adjacent unit time T.

[0047] See Figure 6 Taking a unit time T as an example, where there are 4 light emission cycles M and an overlap of 2 light emission cycles M between two adjacent unit times T, in this configuration, the light emission control signal Emit is designed for the i-th unit time T. i The total duration of light emission (N) within the xth to x+3rd light emission cycles (M) i Then, by adjusting the emission duration of the emission control signal Emit in the (x+4)th emission cycle M and the emission duration in the (x+5)th emission cycle M, the emission control signal Emit in the (i+1)th unit time T is made more efficient. i+1 The total duration N of light emission within (the (x+2)th to (x+5)th light emission cycles) i+1 satisfy conditions.

[0048] In this design, there is an overlap between two adjacent unit times T, which allows for more precise control over brightness fluctuations throughout the entire driving cycle D. Moreover, this design is more suitable for situations with slightly higher frequencies and fewer light emission cycles M in the entire driving cycle D.

[0049] Furthermore, see again Figure 6 The number of overlapping light emission periods M between any two adjacent unit times T is equal, which makes the design of the unit time T simpler and more regular. Moreover, the overlap between any two adjacent unit times T is consistent, and the control of the overall brightness is more uniform.

[0050] When the unit time T includes at least two emission cycles M, in another feasible implementation, such as Figure 7 As shown, Figure 7 This is another timing diagram of the light emission control signal Emit provided in the embodiment of the present invention, in which two adjacent unit time T are continuous and do not overlap.

[0051] See Figure 7 Taking a unit time T comprising 4 light emission cycles M as an example, in this configuration, the light emission control signal Emit is designed to be used in the i-th unit time T. i The total duration of light emission (N) within the xth to x+3rd light emission cycles (M) i Then, by adjusting the emission duration of the emission control signal Emit in the (x+4)th emission cycle M, the emission duration of the (x+5)th emission cycle M, the emission duration of the (x+6)th emission cycle M, and the emission duration of the (x+7)th emission cycle M, the emission control signal Emit in the (i+1)th unit time T is made to... i+1 The total duration N of light emission within the (x+4th to x+7th light emission cycles) i+1 satisfy conditions.

[0052] This design allows for a greater number of adjustable emission cycles M when adjusting the total emission duration of the emission control signal Emit within a unit time T. This enables more precise and flexible control over the total emission duration within a unit time T. For example, by adjusting the emission duration of 1, 2, 3, or 4 emission cycles M, the emission control signal Emit can have different total emission durations within a unit time T. Furthermore, this design is more suitable for situations with slightly lower frequencies and a larger number of emission cycles M within the entire driving cycle D.

[0053] In one feasible implementation, see Figure 6 and Figure 7 The unit time T is an integer multiple of the frame time. The frame time is the duration of one valid frame aF (one hold frame kF).

[0054] Since the effective frame aF and hold frame kF in the driving period D are also divided into one frame time, dividing the unit time T into integer multiples of one frame time can make one unit time T include at least one effective frame aF and / or at least one hold frame kF. This allows the unit time T to correspond with the complete effective frame aF and the complete hold frame kF, making the division of the unit time T more regular.

[0055] In one feasible implementation, the display panel has a first brightness level and a second brightness level, wherein the highest brightness at the second brightness level is lower than the highest brightness at the first brightness level, and the 'A' corresponding to the second brightness level is greater than the 'A' corresponding to the first brightness level. For example, the 'A' corresponding to the second brightness level is 3%, and the 'A' corresponding to the first brightness level is 2%.

[0056] As mentioned earlier, the duration of the emission control signal Emit within the emission period M of the effective frame aF varies at different brightness levels. The lower the brightness level, the shorter the duration of the emission control signal Emit within the emission period M of the effective frame aF. Therefore, compared to the first brightness level, when the display panel is at the second brightness level, the emission control signal Emit has only a shorter duration of emission within the emission period M of the effective frame aF. If the value A corresponding to the second brightness level is set very small, even if the duration of emission of the emission control signal Emit within a single emission period M changes by only 2H or 4H, it may not be possible for the total duration of emission of the emission control signal Emit within two adjacent unit times T to meet the above conditions.

[0057] For example, assuming a unit time T includes one frame (two emission cycles M) and a first-stage emitter shift register circuit drives two pixel rows, at the second brightness level, the emission duration of the emission control signal Emit in a single emission cycle M of the effective frame aF (the first unit time T1) is 200H. If the critical percentage threshold A corresponding to the second brightness level is designed to be 1%, even if the total emission duration of the emission control signal Emit only changes by 4H in the entire second unit time T2, the brightness fluctuation between the second unit time T2 and the first unit time T1 will be... It also cannot be less than 1%. Therefore, the value of A corresponding to the second brightness level can be designed to be larger, so as to provide more feasible ways to regulate the emission control signal Emit under the second brightness level.

[0058] In one feasible implementation, the first mode includes a first driving mode and a second driving mode, wherein the driving frequency in the second driving mode is lower than the driving frequency in the first driving mode. For example, the driving frequency in the first driving mode is 30Hz, and the driving frequency in the second driving mode is 15Hz. The display panel has a third brightness level, wherein the value A corresponding to the third brightness level in the second driving mode is lower than the value A corresponding to the third brightness level in the first driving mode.

[0059] Since the human eye has a lower tolerance for brightness fluctuations at low driving frequencies, for the same brightness level, the A corresponding to the second driving mode with a lower driving frequency can be designed to be smaller, so that the brightness fluctuations generated after the emission control signal Emit is adjusted are smaller and less likely to be visible to the human eye.

[0060] In one feasible implementation, such as Figure 8 As shown, Figure 8 This invention provides another timing diagram for the emission control signal Emit, where the first mode includes a first driving mode F1 and a second driving mode F2. The driving frequency in the second driving mode F2 is lower than the driving frequency in the first driving mode F1. For example, the driving frequency in the first driving mode F1 is 30Hz, and the driving frequency in the second driving mode F2 is 15Hz. The number of emission cycles M per unit time T in the second driving mode F2 is greater than the number of emission cycles M per unit time T in the first driving mode F1.

[0061] Compared to the first driving mode F1, the second driving mode F2 has a lower driving frequency, resulting in a longer driving cycle D. The driving cycle D includes more light-emitting cycles M. Therefore, when setting the unit time T under the second driving mode F2, the number of light-emitting cycles M included in the unit time T can also be increased. Furthermore, the more light-emitting cycles M included in the unit time T, the more options there are for adjusting the light-emitting duration within multiple light-emitting cycles M. For example, the light-emitting control signal Emit can be adjusted to have different total light-emitting durations within the unit time T by using 1, 2, 3, 4, or even more light-emitting cycles M, allowing for more flexible and precise control over brightness fluctuations.

[0062] In one feasible implementation, the driving method further includes: in a first mode, determining whether the current brightness level is greater than a first threshold brightness level and less than a second threshold brightness level; if so, controlling the total duration of the emission control signal Emit within two adjacent unit times T in the driving period D to satisfy: Among them, the highest brightness under the first threshold brightness level is The highest brightness at the second threshold brightness level is L max γ represents the maximum brightness at the highest brightness level of the display panel, and γ is the gamma value. For example, γ can be 2.2.

[0063] When the brightness level is too low or too high, the brightness of the image displayed on the display panel will be very high or very low, making it difficult for the human eye to perceive brightness fluctuations. Therefore, embodiments of the present invention can adjust the aforementioned emission control signal Emit only for brightness levels between the first threshold brightness level and the second threshold brightness level, thereby reducing the number of brightness levels that need to be adjusted and lowering the design complexity.

[0064] In one feasible implementation, the number of emission cycles M within a unit time T is k. The emission duration of the emission control signal Emit in a single emission cycle M of the effective frame aF is t1. When the duty cycle of the emission control signal Emit changes, the minimum change in the emission duration of the emission control signal Emit in a single emission cycle M is Δt. k≥1.

[0065] When the first-stage emitter shift register circuit drives one pixel row, the minimum change in the emission duration of the emission control signal Emit within a single emission cycle M is 2H, and Δt is 2H. When the first-stage emitter shift register circuit drives two pixel rows, the minimum change in the emission duration of the emission control signal Emit within a single emission cycle M is 4H, and Δt is 4H.

[0066] When the emission control signal Emit emits light for a duration t1 of a single emission period M within the effective frame aF greater than 1, the emission duration t1 of the signal Emit is greater than 1. This demonstrates that even if a unit time T comprises only one emission cycle M, by controlling the emission duration Δt of the emission control signal Emit within the emission cycle M of the next unit time T, it is still possible to satisfy the requirement. If there exists a feasible control scheme when a unit time T includes only one emission cycle M, then in this case, the number of emission cycles M included in the unit time T can be 1, 2, 3, etc.

[0067] For example, assuming A = 3%, when the first-level emitter shift register circuit drives one pixel row, the emission duration of the emission control signal Emit in a single emission period M of the effective frame aF is greater than... Assuming the time interval is 100H, even if the unit time T only includes one emission cycle M, by controlling the emission control signal Emit to change the emission duration by 2H in the next unit time T emission cycle M, it is still possible to satisfy the requirement. For conditions less than 3%, the unit time T can include 1, 2, 3, or other numbers of emission cycles M; when the first-stage emitter shift register circuit drives two pixel rows, the emission duration of the emission control signal Emit in a single emission cycle M of the effective frame aF is greater than... Assuming the time interval is 200H, even if the unit time T only includes one emission cycle M, by controlling the emission control signal Emit to change the emission duration by 4H in the next unit time T emission cycle M, it is still possible to satisfy the requirement. If the percentage is less than 3%, then the unit time T can include 1, 2, 3 or other number of emission cycles M.

[0068] In one feasible implementation, the number of emission cycles M within a unit time T is k. The emission duration of the emission control signal Emit in a single emission cycle M of the effective frame aF is t1. When the duty cycle of the emission control signal Emit changes, the minimum change in the emission duration of the emission control signal Emit in a single emission cycle M is Δt. That is, k is greater than 1.

[0069] As mentioned earlier, Δt can be 2H or 4H. When the emission duration t1 of the emission control signal Emit in a single emission period M of the effective frame aF is less than... This indicates that if a unit time T includes only one emission cycle M, even if the emission duration Δt of the control signal Emit changes within the emission cycle M of the next unit time T, it cannot satisfy the requirement. The condition is that there is no feasible control scheme when the unit time T includes only one emission cycle M. In this case, the number of emission cycles M included in the unit time T cannot be one, but can only be two or more.

[0070] For example, assuming A = 3%, when the first-level emitter shift register circuit drives one pixel row, the emission duration t1 of the emission control signal Emit in a single emission period M of the effective frame aF is less than If the duration is 50H, and the unit time T includes only one light emission cycle M, even if the light emission duration of the control signal Emit changes by only 2H in the next unit time T's light emission cycle M, it will still cause... If the value is less than 3%, then the unit time T cannot include only one emission period M; it needs to include two or more emission periods M. When the first-level emitter shift register circuit drives two pixel rows, the row time corresponding to the emission duration t1 of the emission control signal Emit in a single emission period M of the effective frame aF is less than 3%. If the time interval is 100H, and the unit time T only includes one light emission cycle M, even if the light emission duration of the control signal Emit changes by 4H in the next unit time T's light emission cycle M, it will not be possible to make... If the value is less than 3%, then the unit time T cannot include only one emission cycle M, but needs to include two or more emission cycles M.

[0071] Furthermore,

[0072] Based on the foregoing analysis, when the emission duration t1 of the emission control signal Emit in a single emission period M of the effective frame aF is less than At that time, the number of emission cycles M included within a unit time T needs to be two or more. This is further restricted by... When setting the value of k, k can be limited to the minimum selectable value to shorten the duration of unit time T, allowing for more precise control over the brightness fluctuations generated throughout the entire driving cycle D.

[0073] For example, assuming A = 3%, when the first-level emitter shift register circuit drives one pixel row, the row time corresponding to the emission duration t1 of the emission control signal Emit in a single emission period M of the effective frame aF is less than... If it is 20H, then to satisfy k can take values ​​of 4, 5, 6, ..., further satisfying In this case, k can be limited to 4, or, if it is 50H, to satisfy... k can take values ​​of 2, 3, 4, ..., further satisfying When k can be limited to 4; when the first-stage emitter shift register circuit drives two pixel rows, the row time corresponding to the emission duration t1 of the emission control signal Emit in a single emission period M of the effective frame aF is less than If it is 100H, then to satisfy k can take values ​​of 2, 3, 4, ..., further satisfying In this case, k can be limited to 2, or, if it is 50H, to satisfy... k can take values ​​of 3, 4, 5, ..., further satisfying In this case, k can be limited to 3.

[0074] In one feasible implementation, such as Figure 9 As shown, Figure 9In another timing diagram of the emission control signal Emit provided in an embodiment of the present invention, the display panel has a first brightness level DBV-1 and a second brightness level DBV-2, wherein the highest brightness at the second brightness level DBV-2 is less than the highest brightness at the first brightness level DBV-1. The unit time T at the second brightness level DBV-2 includes a first unit time T1, and the emission control signal Emit has different emission durations in at least a portion of the emission period M within the first unit time T1.

[0075] For example, at the first brightness level DBV-1, the emission control signal Emit has an emission duration of 200H and a non-emission duration of 40H in a single emission cycle M of the effective frame aF. At the second brightness level DBV-2, the emission control signal Emit has an emission duration of 100H and a non-emission duration of 140H in a single emission cycle M of the effective frame aF.

[0076] Taking the minimum variation in the duration of light emission within a single emission cycle M as 4H, A = 3%, and a unit time T comprising four frames and one frame comprising two emission cycles M as an example, at the first brightness level DBV-1, the emission control signal Emit corresponds to a emission duration of 200H and a non-emission duration of 40H in each emission cycle M within the first unit time T1. Even if the emission duration of the emission control signal Emit varies by 4H in each emission cycle M within the second unit time T2, the brightness fluctuation in the second unit time T2 compared to the first unit time T1... It can also be less than 3%. However, for the second brightness level DBV-2, the emission control signal Emit has an emission duration of 100H and a non-emission duration of 140H in each emission cycle M within the first unit time T1. If, within the second unit time T2, the emission duration of the emission control signal Emit is controlled to vary by 4H in each emission cycle M, the brightness fluctuation in the second unit time T2 compared to the first unit time T1 will be... The result would reach 4%, failing to meet the condition of less than 3%. Therefore, at the second brightness level DBV-2, the emission control signal Emit can be controlled to have different emission durations in at least a portion of the emission cycles M within the second unit time T2 (the first unit time T1). For example, the emission control signal Emit can be controlled to change its emission duration by 4H in the first emission cycle M of the fourth hold frame kF and by 4H in the first emission cycle M of the sixth hold frame kF, while the emission duration remains unchanged in other emission cycles M. This ensures that the brightness fluctuation of the second unit time T2 compared to the first unit time T1 is... Reduced to 1%.

[0077] As can be seen from the above, for the lower second brightness level DBV-2, the above-mentioned control method can make it easier to meet the brightness fluctuation conditions.

[0078] Furthermore, see again Figure 9 In the first unit time T1, the light emission control signal Emit has a first light emission duration in odd-numbered light emission cycles M and a second light emission duration in even-numbered light emission cycles M. The first light emission duration and the second light emission duration are different, so as to make the timing of the light emission control signal Emit more regular in the first unit time T1.

[0079] For example, in the first unit time T1, the emission duration of the emission control signal Emit in the odd-numbered emission cycles M can be the same as the emission duration of the emission control signal Emit in a single emission cycle M of the effective frame aF. That is, this method does not adjust the duty cycle of the emission control signal Emit in the odd-numbered emission cycles M of the first unit time T1, but only adjusts the duty cycle in the even-numbered emission cycles M. Alternatively, in the first unit time T1, the emission duration of the emission control signal Emit in both the odd-numbered and even-numbered emission cycles M can be different from the emission duration of the emission control signal Emit in a single emission cycle M of the effective frame aF. That is, this method adjusts the duty cycle of the emission control signal Emit in both the odd-numbered and even-numbered emission cycles M of the first unit time T1, but the adjustment magnitude is different.

[0080] Normally, a brightness fluctuation greater than 3% is easily detected by the human eye. Therefore, in a feasible implementation, A can be less than or equal to 3%.

[0081] Considering that flickering at driving frequencies above 60Hz is not easily perceptible to the human eye, in a feasible implementation, the unit time T can be set to be greater than or equal to the time of one data refresh cycle corresponding to 60Hz; that is, the unit time T is greater than or equal to...

[0082] Based on the same inventive concept, embodiments of the present invention also provide a display panel that is driven by the above-described driving method.

[0083] Based on the same inventive concept, embodiments of the present invention also provide a display device, such as... Figure 10 As shown, Figure 10This is a schematic diagram of a display device provided in an embodiment of the present invention. The display device includes the display panel 100 described above. Further, the display device may also include an emitter shift register circuit 200, which is used to provide an emitter control signal Emit to the display panel 100. The specific control method of the emitter control signal Emit has been described in detail in the above embodiments and will not be repeated here.

[0084] certainly, Figure 10 The display device shown is for illustrative purposes only. The display device can be any electronic device with display function, such as a mobile phone, tablet computer, laptop computer, e-reader or television.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A driving method for a display panel, characterized in that, The display panel has a first mode, and the driving cycle in the first mode includes a valid frame and a hold frame; The driving method includes: in the first mode, controlling the light emission control signal to have a total light emission duration of two adjacent unit time intervals in the driving cycle that satisfies: The unit time includes at least one emission cycle, and the first unit time at least partially overlaps with the effective frame, N i and N i+1 These are the total duration of light emission of the light emission control signal in the i-th unit time and the (i+1)-th unit time, respectively, where i≥1, and A is the critical percentage threshold for brightness change; The driving method further includes: in the first mode, determining whether the current brightness level is greater than a first threshold brightness level and less than a second threshold brightness level; if so, controlling the total light emission duration of the light emission control signal in two adjacent unit time periods during the driving cycle to satisfy: ; Wherein, the highest brightness at the first threshold brightness level is The highest brightness at the second threshold brightness level is , γ represents the maximum brightness at the highest brightness level of the display panel, and γ is the gamma value.

2. The driving method according to claim 1, characterized in that, The unit time includes at least two of the light emission cycles.

3. The driving method according to claim 2, characterized in that, There is at least one overlap of the emission cycles between two adjacent unit times.

4. The driving method according to claim 3, characterized in that, The number of overlapping emission cycles between any two adjacent unit times is equal.

5. The driving method according to claim 2, characterized in that, The two adjacent time units are continuous and do not overlap.

6. The driving method according to claim 1, characterized in that, The unit of time is an integer multiple of the time of one frame.

7. The driving method according to claim 1, characterized in that, The display panel has a first brightness level and a second brightness level, wherein the highest brightness at the second brightness level is lower than the highest brightness at the first brightness level. Wherein, the A corresponding to the second brightness level is greater than the A corresponding to the first brightness level.

8. The driving method according to claim 1, characterized in that, The first mode includes a first driving mode and a second driving mode, wherein the driving frequency in the second driving mode is lower than the driving frequency in the first driving mode. The display panel has a third brightness level, wherein the A corresponding to the third brightness level in the second driving mode is less than the A corresponding to the third brightness level in the first driving mode.

9. The driving method according to claim 1, characterized in that, The first mode includes a first driving mode and a second driving mode, wherein the driving frequency in the second driving mode is lower than the driving frequency in the first driving mode. The number of light emission cycles per unit time in the second driving mode is greater than the number of light emission cycles per unit time in the first driving mode.

10. The driving method according to claim 1, characterized in that, The number of light emission cycles included in the unit time is k; The duration of the light emission control signal in a single light emission cycle of the effective frame is t1, and the minimum change in the duration of the light emission control signal in a single light emission cycle when the duty cycle of the light emission control signal changes is Δt. ，k≥1。 11. The driving method according to claim 1, characterized in that, The number of light emission cycles included in the unit time is k; The duration of the light emission control signal in a single light emission cycle of the effective frame is t1, and the minimum change in the duration of the light emission control signal in a single light emission cycle when the duty cycle of the light emission control signal changes is Δt. ，k＞ 。 12. The driving method according to claim 11, characterized in that, 。 13. The driving method according to claim 2, characterized in that, The display panel has a first brightness level and a second brightness level, wherein the highest brightness at the second brightness level is lower than the highest brightness at the first brightness level. The unit time at the second brightness level includes a first unit time, and the light emission control signal has different light emission durations in at least a portion of the light emission cycle within the first unit time.

14. The driving method according to claim 13, characterized in that, In the first unit time, the light emission control signal has a first light emission duration in odd-numbered light emission cycles and a second light emission duration in even-numbered light emission cycles, wherein the first light emission duration and the second light emission duration are different.

15. The driving method according to claim 1, characterized in that, A≤3%。 16. The driving method according to claim 1, characterized in that, The unit time is greater than or equal to s.

17. A display panel, characterized in that, The driving method described in any one of claims 1 to 16 is applied.

18. A display device, characterized in that, Includes the display panel as described in claim 17.

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