Patent Application
20240379052
The present disclosure claims priority to Chinese Patent Application No. 202410224757.2, filed on Feb. 28, 2024, the content of which is incorporated herein by reference in its entirety.
The present disclosure relates to the field of display technologies, and in particular, to a method for driving a display panel, a display panel, and a display apparatus.
During low-frequency driving, if a new screen needs to be displayed to achieve smooth dynamic display effect, a driving frequency of the display panel is usually switched from a low frequency to a high frequency. Meanwhile, a data voltage written into the panel is adjusted to a data voltage corresponding to a to-be-switched screen, thereby completing the screen switching by using the high frequency. After the screen switching is completed, the driving frequency is restored to the original low frequency to continue low frequency display.
However, during the foregoing screen switching, the screen has relatively obvious streaking and residual shadow when the driving frequency jumps from low to high, thereby affecting the display effect.
In a first aspect, embodiments of the present disclosure provide a method for driving a display panel. In a first mode, a driving process of the display panel includes a first stage, a second stage and a third stage, wherein in the first stage, a first screen is displayed at a first frequency; in at least a part of the second stage sequential to the first stage, the first screen is displayed at a frequency greater than the first frequency; and in the third stage, a second screen is displayed at the first frequency.
In a second aspect, embodiments of the present disclosure provide a display panel. The display panel is driven by a method, in which, in a first mode, a driving process of the display panel comprises a first stage, a second stage and a third stage, wherein in the first stage, a first screen is displayed at a first frequency; in at least a part of the second stage sequential to the first stage, the first screen is displayed at a frequency greater than the first frequency; and in the third stage, a second screen is displayed at the first frequency.
In a third aspect, embodiments of the present disclosure provide a display apparatus. The display apparatus includes a display panel. The display panel is driven by a method, in which, in a first mode, a driving process of the display panel comprises a first stage, a second stage and a third stage, wherein in the first stage, a first screen is displayed at a first frequency; in at least a part of the second stage sequential to the first stage, the first screen is displayed at a frequency greater than the first frequency; and in the third stage, a second screen is displayed at the first frequency.
In order to more clearly explain the embodiments of the present disclosure or the technical solution in the related art, the drawings to be used in the description of the embodiments or the related art will be briefly described below. The drawings in the following description are some embodiments of the present disclosure. For those skilled in the art, other drawings may further be obtained based on these drawings.
In order to better understand technical solutions of the present disclosure, the embodiments of the present disclosure are described in details with reference to the drawings.
It should be clear that the described embodiments are merely part of the embodiments of the present disclosure rather than all of the embodiments. All other embodiments obtained by those skilled in the art without paying creative labor shall fall into the protection scope of the present disclosure.
The terms used in the embodiments of the present disclosure are merely for the purpose of describing specific embodiment, rather than limiting the present disclosure. The terms “a”, “an”, “the” and “said” in a singular form in the embodiments of the present disclosure and the attached claims are also intended to include plural forms thereof, unless noted otherwise.
It should be understood that the term “and/or” used in the context of the present disclosure is to describe a correlation relation of related objects, indicating that there may be three relations, e.g., A and/or B may indicate only A, both A and B, and only B. In addition, the symbol “/” in the context generally indicates that the relation between the objects in front and at the back of “/” is an “or” relationship.
As described in the background, in a low-frequency driving process, if a new screen needs to be displayed, in order to achieve a smooth dynamic display effect, a driving frequency of the display panel is usually switched from a low frequency to a high frequency. Meanwhile, a data voltage written into the panel is adjusted to a data voltage corresponding to a to-be-switched screen, so that the screen switching is completed by using a high frequency. After the screen switching is completed, the driving frequency is restored to the original low frequency to continue low frequency display.
The dotted line L in
In an application scenario, the display panel displays a time screen at a low frequency, for example, the above operations are performed when the time screen of “12:00” needs to be switched to the time screen of “12:01”.
However, during this screen switching, when the driving frequency is switched from low to high, the screen may have an obvious streaking phenomenon under the influence of factors such as the hysteresis effect of a driving tube, thereby adversely affecting the display effect.
Therefore, the present disclosure provides a method for driving a display panel. During the low-frequency driving, the method can effectively weaken the adverse effect of the streaking issues generated when the driving frequency is switched from low to high on the display effect.
The display panel has a first mode, and the first mode is a low-frequency display mode.
Referring to
By adopting the driving method provided by the embodiment of the present disclosure, when switching from the first screen to the second screen, the operation of first switching to the high frequency and then switching the screen is executed. Referring to
In an embodiment of the present disclosure, referring again to
In the drawings of the present disclosure, the position indicated by the bolded arrow below the horizontal axis is a time point at which the data voltage corresponding to the second screen starts to be written into the panel.
Further, referring to
In an embodiment of the present disclosure, the first frequency f1 is 15 Hz, the second frequency f2 is 60 Hz, and the third frequency f3 is 45 Hz. Referring to
At this time, the second sub-stage B2 may be considered as a frequency transition stage between the first sub-stage B1 and the third stage A2, implementing gradient transition of frequencies, and avoiding directly jumping from a very high frequency to a very low frequency when the second stage B enters the third stage A2, thereby avoiding an adverse effect that may be caused by too large frequency jump.
Further, a difference between the frequency of the second sub-stage B2 and the frequency of the first sub-stage B1 is a first difference, and a difference between the frequency of the second sub-stage B2 and the first frequency f1 is a second difference. In an embodiment of the present disclosure, the first frequency f1 is 15 Hz, the second frequency f2 is 75 Hz, and the third frequency f3 is 45 Hz.
In an embodiment of the present disclosure, the first frequency f1 is 15 Hz, and the second frequency f2 is 60 Hz. Referring to
In this manner, the entire second stage B is driven only with a constant frequency. First, the frequency setting in the second stage B is simpler. Second, when the first sub-stage B1 enters the second sub-stage B2, only the screen is switched without switching frequency, thereby avoiding an obvious display problem caused by switching multiple conditions at the same time. In addition, the overall duration of the second stage B in this manner is relatively short, which reduces power consumption.
In addition, the brightness of the same screen at different frequencies is different. Hereinafter, the second sub-stage B2 and the third stage A2 are taken as examples for illustration.
The third stage A2 has the first frequency f1, and the frequency of the second sub-stage B2 is greater than the first frequency f1, for example, the second frequency f2 or the third frequency f3. Therefore, although both same second screens are displayed, the driving frequencies are not the same.
In one case, the low frequency is implemented by means of frame interpolation.
Since the pixel circuit performs the data refresh operation only in the writing frame F1, and does not perform the data refresh operation in the holding frame F2. Therefore, the gate potential of the driving tube is refreshed frequently at the frequency f of the second sub-stage B2, and the gate potential of the driving tube is refreshed slowly at the first frequency f1, thereby causing the threshold voltage of the driving tube at the first frequency f1 to be significantly shifted, and making the brightness of the screen at the first frequency f1 higher. Moreover, since the pixel circuit performs the data refresh operation only in the writing frame F1, the charging degree of the driving tube is consistent in the first driving period T1 and the second driving period T2. However, since the first driving period T1 has a longer holding time, the leakage time is longer, causing the gate potential of the driving tube to be pulled down, resulting in an increase in the brightness of the screen at the first frequency f1.
The dotted line L in the drawings of the present disclosure refers to the actual brightness. Referring to
Alternatively, in another case, the low frequency may further be implemented in a non-interpolated frame manner.
Due to the short charging time of the driving tube in the second driving period T2, the driving tube will be charged insufficiently, resulting in a lower gate potential and higher brightness the screen at the frequency f of the second sub-stage B2. Therefore, a downward brightness fluctuation will occur when entering the third stage A2 from the second sub-stage B2.
In conclusion, the brightness of the same screen at different frequencies is different, and the brightness flicker phenomenon occurs at least when entering the third stage A2 from the second sub-stage B2.
Therefore, in an embodiment of the present disclosure, different gamma curves may be set for the first frequency f1 and the frequency f of the second sub-stage B2 in a possible implementation.
In an embodiment, the display panel displays according to the mapping relationship constructed by grayscale values and data voltages. The first frequency f1 and the frequency f of the second sub-stage B2 correspond to different mapping relationships, and a same grayscale value corresponds to different data voltages in different mapping relationships.
For the same grayscale value, by enabling the first frequency f1 and the frequency f of the second sub-stage B2 to correspond to different data voltages, the brightness of the screen at the two frequencies can be adjusted as needed to reduce the brightness difference of the second screen displayed at the two frequencies, thereby effectively avoiding the brightness flicker when entering the third stage A2 from the second sub-stage B2.
More specifically, when the low frequency is implemented by using the foregoing interpolation frame manner, for the same grayscale value, the data voltage corresponding to the grayscale value may be set higher in the mapping relationship corresponding to the first frequency f1. That is, for the same grayscale value, the data voltage corresponding to the mapping relationship corresponding to the first frequency f1 is greater than the data voltage corresponding to the mapping relationship corresponding to the frequency f of the second sub-stage B2, thereby pulling down the brightness of the screen at the first frequency f1, so that the brightness of the screen tends to be consistent with the brightness of the screen at the frequency of the second sub-stage B2.
Alternatively, when the low frequency is implemented by using the foregoing non-interpolation frame manner, for the same grayscale value, the data voltage corresponding to the grayscale value may be set lower in the mapping relationship corresponding to the first frequency f1. That is, for the same grayscale value, the data voltage corresponding to the mapping relationship corresponding to the first frequency f1 is smaller than the data voltage corresponding to the mapping relationship corresponding to the frequency of the second sub-stage B2, thereby pulling up the brightness of the screen at the first frequency f1, so that the brightness of the screen tends to be consistent with the brightness of the screen at the frequency of the second sub-stage B2.
In an embodiment of the present disclosure, different duty ratios may be set for the light-emitting control signal for the first frequency f1 and the frequency f of the second sub-stage B2 in another possible implementation.
In an embodiment, referring to
Referring to
The driving tube M0 has a gate electrically connected to a first node N1, a first electrode electrically connected to a second node N2, and a second electrode electrically connected to the third stage A2 N3.
The gate reset tube M1 has a gate electrically connected to a first scan line Scan1, a first electrode electrically connected to a reset signal line Vref, and a second electrode electrically connected to the first node N1. The gate reset tube M1 is configured to reset the gate of the driving tube M0 in response to a first scan active level provided by the first scan line Scan1.
The data writing tube M2 has a gate electrically connected to a second scan line Scan2, a first electrode electrically connected to a data line Data, and a second electrode electrically connected to the second node N2. The threshold compensation tube M3 has a gate electrically connected to the second scan line Scan2, a first electrode electrically connected to a third node N3, and a second electrode electrically connected to the first node N1. The data writing tube M2 and the threshold compensation tube M3 are configured to charge the driving tube M0 and perform threshold compensation in response to a second scanning active level provided by the second scanning line Scan2. The transistor shown in
The first light-emitting control transistor M4 has a gate electrically connected to a light-emitting control line Emit, a first electrode electrically connected to a power line PVDD, and a second electrode electrically connected to the second node N2. The second light-emitting control transistor M5 has a gate electrically connected to the light-emitting control line Emit, a first electrode electrically connected to the third node N3, and a second electrode electrically connected to a light-emitting element D. The first light-emitting control transistor M4 and the second light-emitting control transistor M5 are configured to transmit the driving current converted by the driving tube M0 to the light-emitting element D in response to a light-emitting active level provided by the light-emitting control line Emit, to control the light-emitting element D to emit light.
The anode reset tube M6 has a gate electrically connected to the second scan line Scan2, a first electrode electrically connected to a reset signal line Vref, and a second electrode electrically connected to the light-emitting element D. The anode reset tube M6 is configured to reset the light-emitting element D in response to the second scan active level provided by the second scan line Scan2.
A storage capacitor C has a first electrode plate electrically connected to the first node N1, and a second electrode plate electrically connected to the power line PVDD.
When the transistor in the pixel circuit is a P-type transistor, each of the first scan active level, the second scan active level and the light-emitting active level is a low level. When the transistor in the pixel circuit is an N-type transistor, each of the first scan active level, the second scan active level and the light-emitting active level is a high level. The drawings of embodiments of the present disclosure are illustrated by taking the transistor in the pixel circuit as a P-type transistor as an example.
The signal provided by the light-emitting control line Emit is the light-emitting control signal. It can be understood that the duty ratio of the light-emitting control signal is used to control the light-emitting duration of the light-emitting element, thereby affecting the light-emitting brightness of the sub-pixel.
In addition, after adjusting the duty ratios of the light-emitting control signals at different frequencies, other conditions such as the gamma curve may not need to be adjusted. For example, at this time, the first frequency f1 and the frequency of the second sub-stage B2 may correspond to the same mapping relationship, resulting in a simpler adjustment for the panel control logic.
Further, referring to
With reference to the foregoing analysis, it can be seen that the low frequency in this manner is implemented by using the frame interpolation manner, and thus the brightness of the screen at the first frequency f1 is relatively high. By reducing the duty ratio of the light-emitting control signal in the first driving period T1, the light-emitting time of the light-emitting element can be shortened in the first driving period T1, and the brightness of the screen can be reduced, thereby reducing the brightness difference between the third stage A2 and the second sub-stage B2, and avoiding the flicker phenomenon when entering the third stage A2 from the second sub-stage B2.
Further, referring to
When the first sub-stage B1 has the second frequency f2 and the second sub-stage B2 has the third frequency f3, the display panel has a third driving period at the second frequency f2, and the duty ratio of the light-emitting control signal in the first driving period T1 may also be set to be smaller than the duty ratio of the light-emitting control signal in the third driving period, so that the brightness of the first stage A1 and the brightness of the first sub-stage B1 when displaying the first screen tend to be consistent, thereby avoiding the flicker phenomenon when entering the first sub-stage B1 from the first stage A1.
Alternatively, referring to
With reference to the foregoing analysis, it can be seen that the low frequency in this manner is implemented by using a non-interpolated frame manner, and thus the brightness of the screen at the first frequency f1 is relatively low. By increasing the duty ratio of the light-emitting control signal in the first driving period T1, the light-emitting time of the light-emitting element can be shortened in the first driving period T1, and the light-emitting brightness can be reduced, thereby reducing the brightness difference between the third stage A2 and the second sub-stage B2, and avoiding the flicker phenomenon when entering the third stage A2 from the second sub-stage B2.
Further, referring to
When the first sub-stage B1 has the second frequency f2 and the second sub-stage B2 has the third frequency f3, the display panel has a third driving period at the second frequency f2, and the duty ratio of the light-emitting control signal in the first driving period T1 may also be set to be greater than the duty ratio of the light-emitting control signal in the third driving period, so that the brightness of the first stage A1 and the brightness of the first sub-stage B1 when displaying the first screen tend to be consistent, thereby avoiding the flicker phenomenon when entering the first sub-stage B1 from the first stage A1.
In an embodiment of the present disclosure, the frequency of the first stage A1 is 15 Hz, the frequency of the third sub-stage B3 is 45 Hz, the frequency of the fourth sub-stage B4 is 60 Hz, and the frequency of the third stage A2 is 15 Hz. With reference to the foregoing analysis, it can be seen that the brightness of the screen of the same screen at different frequencies is different. In this driving manner, frequencies of the first stage A1, the third sub-stage B3, and the fourth sub-stage B4 gradually increase, and the third sub-stage B3 may be considered as a transition period between the first stage A1 and the fourth sub-stage B4, so that the first screen completes a slow transition of brightness at different frequencies.
In an embodiment of the present disclosure, the frequency of the first stage A1 is 15 Hz, the frequency of the third sub-stage B3 is 60 Hz, the frequency of the fourth sub-stage B4 is 45 Hz, and the frequency of the third stage A2 is 15 Hz, thereby weakening the frequency jump degree when entering the third stage A2 from the fourth sub-stage B4, and avoiding a large frequency jump while screen switching, which greatly affects display.
In an embodiment of the present disclosure, the second stage B includes x frames. To avoid an effect of reducing power consumption due to an excessively long high-frequency time inserted in low-frequency driving, x may satisfy: 1≤x≤15.
Based on the same concept, the present disclosure further provides a display panel, as shown in
Based on the same concept, an embodiment of the present disclosure further provides a display apparatus, as shown in
The above are merely exemplary embodiments of the present disclosure, which, as mentioned above, are not used to limit the present disclosure. Whatever within the principles of the present disclosure, including any modification, equivalent substitution, improvement, etc., shall fall into the protection scope of the present disclosure.
Finally, it should be noted that the technical solutions of the present disclosure are illustrated by the above embodiments, but not intended to limit thereto. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art can understand that the present disclosure is not limited to the specific embodiments described herein, and can make various modifications, readjustments, and substitutions without departing from the scope of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202410224757.2 | Feb 2024 | CN | national |
