Brightness adjustment method and device of display panel and computer device

Abstract

The application relates to a brightness adjusting method and device of a display panel and a computer device. The method comprises the following steps: in the case that the refresh frequency of the display panel is lowered from an initial refresh frequency to a target refresh frequency, for any one image refresh period when the display is performed according to the target refresh frequency, a plurality of pulses included in a light-emitting maintaining stage of the image refresh period are acquired, and the plurality of pulses are divided into a plurality of groups; for each group, an initial duty cycle of a light-emitting control signal under the target refresh frequency is adjusted to obtain a target duty cycle of the light-emitting control signal under the group; and based on a target brightness value and a target duty cycle of each pulse in the light-emitting maintaining stage, the width of the pulse in the group is adjusted to adjust the brightness of the display panel under the target refresh frequency. The method provided by the application can effectively improve the flicker visual effect in the refresh frequency lowering process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display driving, and in particular to a display panel brightness adjustment method and device and a computer device. BACKGROUND

[0002] In the prior art, in the process of reducing the refresh frequency of a display panel from a higher refresh frequency to a lower refresh frequency, the brightness of the display panel at the lower refresh frequency is less than the brightness at the higher refresh frequency, and the duration of the image refresh cycle at the lower refresh frequency is greater than the duration of the image refresh cycle at the higher refresh frequency, so that the display panel will flicker in the process of reducing the refresh frequency. SUMMARY

[0003] Therefore, it is necessary to provide a display panel brightness adjustment method, device and computer device capable of eliminating flicker in a display panel to solve the above technical problems.

[0004] In a first aspect, the present application provides a display panel brightness adjustment method, which comprises:

[0005] In the case of reducing the refresh frequency of a display panel from an initial refresh frequency to a target refresh frequency, for any one image refresh cycle when displaying at the target refresh frequency, the initial duty cycle of a plurality of pulses included in the light-emitting holding stage of the image refresh cycle and the target brightness value of each pulse in the light-emitting holding stage at the target refresh frequency are obtained, and the plurality of pulses are divided into a plurality of groups.

[0006] For each group, the initial duty cycle is adjusted to obtain the target duty cycle of the light-emitting control signal under the group.

[0007] Based on the target brightness value and the target duty cycle, the width of the pulses in the group is adjusted to adjust the brightness of the display panel at the target refresh frequency.

[0008] In one of the embodiments, the plurality of pulses are divided into a plurality of groups, which comprises:

[0009] The number of light-emitting holding stages of the image refresh cycle and the number of pulses included in each light-emitting holding stage are obtained.

[0010] Based on the number of light-emitting holding stages and the number of pulses, the pulses included in all light-emitting holding stages of the image refresh cycle are divided into a plurality of groups.

[0011] In one of the embodiments, the image refresh period comprises a data writing stage and at least one light emitting holding stage, and the number of pulses included in the data writing stage and each light emitting holding stage is the same.

[0012] In one of the embodiments, the number of the groups is greater than the number of the light emitting holding stages.

[0013] In one of the embodiments, for each group, the adjusting of the initial duty cycle to obtain the target duty cycle of the light emitting control signal under the group comprises:

[0014] adjusting the initial duty cycle by the preset duty cycle corresponding to the group as a step value to obtain a flicker value corresponding to the duty cycle obtained after the adjusting, the flicker value representing the intensity of the flicker phenomenon generated by the display panel during refreshing;

[0015] obtaining the target duty cycle based on the flicker value.

[0016] In one of the embodiments, the obtaining of the target duty cycle based on the flicker value comprises:

[0017] when the number of the adjusting reaches a preset number corresponding to the group, obtaining a minimum flicker value from all the flicker values, and determining the duty cycle corresponding to the minimum flicker value as the target duty cycle.

[0018] In one of the embodiments, the time interval between each two adjustments is a line period under the target refresh frequency, and the line period is the time length required for scanning one line of pixels.

[0019] In one of the embodiments, the adjusting of the width of the pulse in the group based on the target brightness value and the target duty cycle comprises:

[0020] during the display according to the target refresh frequency, obtaining a current brightness value corresponding to each pulse in the image refresh period;

[0021] determining a target pulse in the group based on the target brightness value and the current brightness value;

[0022] adjusting the width of the target pulse based on the target duty cycle.

[0023] In one of the embodiments, the determining of the target pulse in the group based on the target brightness value and the current brightness value comprises:

[0024] for the pulse in the group, obtaining a brightness value difference between the target brightness value corresponding to the pulse and the current brightness value corresponding to the pulse;

[0025] In a case where the difference between the luminance values is greater than a preset luminance value, the pulse is determined as a target pulse in the group.

[0026] In one of the embodiments, the method further comprises:

[0027] During the display in accordance with the target refresh frequency, a luminance value corresponding to each pulse in a first image refresh period is acquired;

[0028] For a pulse in any image refresh period other than the first image refresh period, a pulse corresponding to the pulse in the first image refresh period is acquired;

[0029] Based on the luminance value of the pulse corresponding to the pulse, a target luminance value corresponding to the pulse is acquired.

[0030] In one of the embodiments, the adjusting of the luminance of the display panel at the target refresh frequency comprises:

[0031] Based on the adjusted pulse width, a target light-emitting control signal is generated by a shift register corresponding to the light-emitting control signal;

[0032] Based on the target light-emitting control signal, the corresponding pixel in the display panel is controlled to emit light.

[0033] In one of the embodiments, the method further comprises:

[0034] For each pixel in the display panel, based on the target light-emitting control signal, a charging period of the pixel in the image refresh period is acquired;

[0035] In the charging period, the pixel is in an open state by injecting electric charges into the pixel.

[0036] In one of the embodiments, the luminance of the display panel is positively correlated with the target duty cycle.

[0037] In one of the embodiments, the display panel is an OLED display panel.

[0038] In a second aspect, the application further provides a luminance adjusting device of a display panel, the device comprising:

[0039] The acquisition module is configured to, in a case where the refresh frequency of the display panel is decreased from an initial refresh frequency to a target refresh frequency, acquire, for any one image refresh period when display is performed at the target refresh frequency, a plurality of pulses included in a light emission maintaining stage of the image refresh period, an initial duty cycle of the light emission control signal at the target refresh frequency, and a target brightness value corresponding to each pulse in the light emission maintaining stage, and divide the plurality of pulses into a plurality of groups.

[0040] The first adjusting module is configured to, for each group, adjust the initial duty cycle to obtain a target duty cycle of the light emission control signal under the group.

[0041] The second adjusting module is configured to adjust the width of the pulses in the group based on the target brightness value and the target duty cycle, to adjust the brightness of the display panel at the target refresh frequency.

[0042] In a third aspect, the present application also provides a computer device. The computer device comprises a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps of the method in any one of the above embodiments are implemented.

[0043] The brightness adjusting method, the brightness adjusting device and the computer device of the display panel can, in a case where the refresh frequency of the display panel is decreased from an initial refresh frequency to a target refresh frequency, acquire, for any one image refresh period when display is performed at the target refresh frequency, a plurality of pulses included in a light emission maintaining stage of the image refresh period, and divide the plurality of pulses into a plurality of groups; for each group, adjust an initial duty cycle of the light emission control signal at the target refresh frequency to obtain a target duty cycle of the light emission control signal under the group; and adjust the width of the pulses in the group based on a target brightness value corresponding to each pulse in the light emission maintaining stage and the target duty cycle, to adjust the brightness of the display panel at the target refresh frequency. In this way, the brightness of the display panel is adjusted in the grouping manner, which can effectively improve the flicker visual effect in the refresh frequency decreasing process, and since the adjustment is performed for each group respectively, the mutual influence of the adjustment processes between different groups can be avoided, thereby ensuring the accuracy of the brightness adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0045] Figure 1Fig. 1 is a schematic diagram of a display panel in the prior art, showing the process of reducing from 120Hz to 30Hz;

[0046] Figure 2 Fig. 2 is a schematic diagram of a light emitting control signal in the prior art;

[0047] Figure 3 Fig. 3 is a schematic diagram of a 30Hz duty cycle adjustment process in the prior art;

[0048] Figure 4 Fig. 4 is a schematic diagram of a light emitting control signal after duty cycle adjustment in the prior art;

[0049] Figure 5 Fig. 5 is a schematic diagram of a refresh frequency reduction process after duty cycle adjustment in the prior art;

[0050] Figure 6 Fig. 6 is a schematic diagram of a duty cycle adjustment process in the prior art;

[0051] Figure 7 Fig. 7 is a schematic diagram of an application environment of a display panel brightness adjustment method in an embodiment;

[0052] Figure 8 Fig. 8 is a schematic diagram of a flow of a display panel brightness adjustment method in an embodiment;

[0053] Figure 9 Fig. 9 is a schematic diagram of a pulse grouping rule in an embodiment;

[0054] Figure 10 Fig. 10 is a schematic diagram of a flow of a pulse grouping method in an embodiment;

[0055] Figure 11 Fig. 11 is a schematic diagram of a pulse grouping rule in another embodiment;

[0056] Figure 12 Fig. 12 is a structural block diagram of a display panel brightness adjustment device in an embodiment;

[0057] Figure 13 Fig. 13 is an internal structure diagram of a computer device in an embodiment. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0059] The technical problem in the prior art is as shown in Figure 1 Figure 1 represents the process of reducing from 120Hz to 30Hz of a display panel. Figure 1 ​The horizontal axis of the figure is a time axis, and the vertical axis represents the brightness of the display panel. Each bar-shaped graph represents a pulse. The width of the bar-shaped graph on the horizontal axis is the duration of the pulse, and the height of the bar-shaped graph on the vertical axis is the brightness of the display panel during the duration of the pulse. A group of pulses from high to low represents an image refresh period. Each of the first five image refresh periods is composed of three pulses. The five image refresh periods are all image refresh periods at 120 Hz. Starting from the sixth image refresh period, each subsequent image refresh period is composed of 12 pulses. Each image refresh period starting from the sixth image refresh period is an image refresh period at 30 Hz. Starting from the sixth image refresh period, the display panel is in a low-frequency mode. Figure 1 As can be seen from the figure, the brightness of the display panel at 120 Hz is 6-8 nit higher than the brightness at 30 Hz on average. The difference in brightness is large, and flicker visual effects may occur during the process of reducing from 120 Hz to 30 Hz.

[0060] Figure 1 A schematic diagram of the corresponding light emission control signal is shown in Figure 2 , and Figure 2 The horizontal axis of the figure is a time axis, and the vertical axis represents the brightness of the display panel. The horizontal axis of the convex part represents the corresponding light emission duration of the write frame or the hold frame, and the vertical axis of the convex part represents the brightness of the display panel during the light emission duration. The horizontal axis of the concave part represents the corresponding non-light emission duration of the write frame or the hold frame, and the vertical axis of the concave part represents the brightness of the display panel during the non-light emission duration, which is 0. Figure 2 The leftmost part of the figure represents the last image refresh period at 120 Hz. “30HZ 1st frame” and “30HZ 2st frame” represent the first image refresh period and the second image refresh period at 30 Hz, respectively. “85%” represents that the duty cycle of the light emission control signal in the write frame and the hold frame is 85% at 120 Hz and 30 Hz. Starting from the sixth image refresh period, Figure 2 As can be seen from the figure, at 30 Hz, an image refresh period includes one 120 Hz data write-in phase and three 120 Hz light emission hold phases.

[0061] To solve the technical problems in the background art, the prior art adjusts the duty cycle of the light emission control signal in each light emission hold phase in the data refresh period at 30 Hz. As shown in Figure 3 , and Figure 3 In the figure, duty0 is the duty cycle of the light emission control signal in the data write-in phase, and duty1, duty2, and duty3 are the duty cycles of the light emission control signal in the first, second, and third light emission hold phases, respectively. By increasing duty1, duty2, and duty3 respectively, the light emission duration of the display panel in the light emission hold phase is increased. For example, as shown in Figure 4As shown, duty1, duty2 and duty3 are all adjusted from 85% to 92%, so that the light-emitting time of the display panel in the light-emitting maintaining stage is increased, the brightness of the whole light-emitting maintaining stage is improved, the flicker visual effect is improved, for example, as shown in Figure 5 As shown, after the duty cycle adjustment, the brightness of the display panel at 120HZ is only 1-2 nit higher than that at 30HZ on average. However, in the process of adjusting duty1, duty2 and duty3 using this method, duty1 needs to be adjusted first, duty2 is adjusted based on the adjustment result of duty1, and duty3 is adjusted based on the adjustment result of duty2. In this way, the adjustment result of duty2 will be affected by duty1, and the adjustment result of duty3 will be affected by duty1 and duty2, so that it is difficult to determine the accurate adjustment values of duty2 and duty3, and the adjustment result is not accurate enough; for example, as shown in Figure 6 Figure 6 The write frame in the above is the data writing stage, and the maintaining frame is the light-emitting maintaining stage. The write frame and the maintaining frame 1 form a 60HZ image refresh cycle, the write frame, the maintaining frame 1 and the maintaining frame 2 form a 40HZ image refresh cycle, and the write frame, the maintaining frame 1, the maintaining frame 2 and the maintaining frame 3 form a 30HZ image refresh cycle. In the process of reducing the refresh frequency of the display panel from 120HZ to 30HZ, duty1 is adjusted at 60HZ first, duty2 is adjusted at 40HZ based on the adjustment result at 60HZ, and duty3 is adjusted at 30HZ based on the adjustment result at 40HZ.

[0062] To solve the above technical problems, the embodiments of the present application provide a brightness adjustment method of a display panel. In the case that the refresh frequency of the display panel is reduced from an initial refresh frequency to a target refresh frequency, for any one image refresh cycle when displaying at the target refresh frequency, a plurality of pulses included in a light-emitting maintaining stage of the image refresh cycle are obtained, and the plurality of pulses are divided into a plurality of groups. For each group, the initial duty cycle of the light-emitting control signal at the target refresh frequency is adjusted to obtain the target duty cycle of the light-emitting control signal under the group. Based on the target brightness value and the target duty cycle of each pulse in the light-emitting maintaining stage, the width of the pulse in the group is adjusted to adjust the brightness of the display panel at the target refresh frequency. In this way, the brightness of the display panel is adjusted by grouping, which can effectively improve the flicker visual effect in the process of reducing the refresh frequency, and since each group is adjusted separately, the mutual influence of the adjustment processes between different groups and between different light-emitting maintaining stages can be avoided, thereby ensuring the accuracy of the brightness adjustment.

[0063] ​The brightness adjustment method of the display panel provided in the embodiments of the present application can be applied to the application environment as shown in Figure 7 The Driver IC 702 and the display panel 704 are electrically connected through a flexible circuit or a cable. The display panel 704 is an OLED display panel. In the case where the refresh frequency of the display panel 704 is decreased from an initial refresh frequency to a target refresh frequency, the Driver IC 702 divides a plurality of pulses included in the light-emitting maintaining stage into a plurality of groups, obtains the target duty cycle of the light-emitting control signal under the target refresh frequency, and finally adjusts the brightness of the display panel 704 under the target refresh frequency based on the target duty cycle.

[0064] In an exemplary embodiment, as shown in Figure 8 A brightness adjustment method of a display panel is provided. The method is applied to the Driver IC in Figure 7 for example, and includes the following steps 802 to 806. Wherein:

[0065] S802, in the case where the refresh frequency of the display panel is decreased from an initial refresh frequency to a target refresh frequency, for any one image refresh period when displaying at the target refresh frequency, a plurality of pulses included in the light-emitting maintaining stage of the image refresh period, an initial duty cycle of the light-emitting control signal under the target refresh frequency, and a target brightness value corresponding to each pulse in the light-emitting maintaining stage are obtained, and the plurality of pulses are divided into a plurality of groups.

[0066] Wherein, the refresh frequency refers to the number of times of updating the image per second of the display panel; the image refresh period refers to the process of completing one complete image display of the display panel, and one image refresh period includes one data writing stage and at least one light-emitting maintaining stage. For example, one 30HZ image refresh period includes one 120HZ data writing stage and three 120HZ light-emitting maintaining stages. For one image refresh period, the content of the image in the display panel is updated in the data writing stage, and the image content updated in the data writing stage is maintained in the light-emitting maintaining stage. The light-emitting control signal is used to control the light-emitting of the pixels in the display panel. The duty cycle of the light-emitting control signal refers to the ratio between the time length of the light-emitting control signal at the effective level (low level) and the total time length corresponding to the light-emitting control signal. The target brightness value corresponding to each pulse in the light-emitting maintaining stage of the image refresh period under the target refresh frequency can be determined based on the display of the display panel under the initial refresh frequency.

[0067] Optionally, at the target refresh frequency, for each image refresh period, the total number of pulses included in all light-emitting holding stages in the image refresh period is obtained, the number of groups is determined based on the number of light-emitting holding stages included in the image refresh period, and all pulses included in the light-emitting holding stages are divided into different groups according to the order of the pulses in the time axis based on the number of groups, wherein the number of groups is greater than the number of light-emitting holding stages included in the image refresh period; as shown in Figure 9 Figure 9 The refresh frequency of the display panel is reduced from 120HZ to 60HZ, 40HZ and 30HZ, respectively, and the grouping cases at the refresh frequencies are shown. Since there is only one light-emitting holding stage in each image refresh period at 60HZ, the number of groups (Hold Group 1) is at least 2. Since there are two light-emitting holding stages in each image refresh period at 40HZ, the number of groups (Hold Group 2) is at least 3. Since there are three light-emitting holding stages in each image refresh period at 30HZ, the number of groups (Hold Group 3) is at least 4. For example, in the case where the target refresh frequency is 30HZ, the number of pulses included in each light-emitting holding stage is 16. Since there are three light-emitting holding stages in each image refresh period at 30HZ, the number of groups can be determined to be 4. According to the corresponding time order of the pulses, 48 pulses included in the three light-emitting holding stages are evenly distributed into 4 groups, and each group includes 12 pulses.

[0068] S804, for each group, the initial duty cycle is adjusted to obtain the target duty cycle of the light-emitting control signal under the group.

[0069] Optionally, after the grouping is completed, the initial duty cycle is adjusted to different degrees for all groups. After the initial duty cycle is adjusted, the display panel is controlled to be reduced from the initial refresh frequency to the target refresh frequency, and the degree of flicker visual effect in the refresh frequency reduction process is detected. In the case where the degree of flicker visual effect is the lowest, the adjusted duty cycle corresponding to each group is determined as the target duty cycle corresponding to the group.

[0070] S806, based on the target brightness value and the target duty cycle, the width of the pulse in the group is adjusted to adjust the brightness of the display panel at the target refresh frequency.

[0071] The pulse width refers to the duration of the pulse.

[0072] Optionally, for each group, a target pulse can be selected from the pulses in the group based on the target brightness value, and the width of the target pulse is increased based on the target duty cycle, so that the brightness of the display panel at the target refresh frequency is brightened.​

[0073] In the brightness adjustment method of the display panel, in a case where the refresh frequency of the display panel is decreased from an initial refresh frequency to a target refresh frequency, for any one image refresh period when display is performed at the target refresh frequency, a plurality of pulses included in a light-emitting maintaining stage of the image refresh period are obtained, and the plurality of pulses are divided into a plurality of groups; for each group, an initial duty cycle of the light-emitting control signal at the target refresh frequency is adjusted to obtain a target duty cycle of the light-emitting control signal under the group; and based on a target brightness value and the target duty cycle of each pulse in the light-emitting maintaining stage, the width of the pulse in the group is adjusted to adjust the brightness of the display panel at the target refresh frequency. In this way, the brightness of the display panel is adjusted by grouping, which can effectively improve the flicker visual effect during the decrease of the refresh frequency, and since the adjustment is performed for each group respectively, the mutual influence of the adjustment processes between different groups can be avoided, thereby ensuring the accuracy of the brightness adjustment.

[0074] In some embodiments, as shown in FIG. 10, dividing the plurality of pulses into the plurality of groups comprises: Figure 10

[0075] S1002, obtaining the number of light-emitting maintaining stages of the image refresh period and the number of pulses included in each light-emitting maintaining stage.

[0076] S1004, based on the number of light-emitting maintaining stages and the number of pulses, dividing the pulses included in all light-emitting maintaining stages of the image refresh period into a plurality of groups.

[0077] Optionally, for one image refresh period, based on the number of light-emitting maintaining stages and the number of pulses included in each light-emitting maintaining stage, the total number of pulses included in all light-emitting maintaining stages of the image refresh period is obtained, and based on the total number of pulses, the pulses included in all light-emitting maintaining stages of the image refresh period are divided into a plurality of groups.

[0078] In this embodiment, based on the number of light-emitting maintaining stages and the number of pulses, the pulses included in all light-emitting maintaining stages of the image refresh period are divided into a plurality of groups, so that the subsequent adjustment process of the duty cycle of the light-emitting control signal based on the grouping result is more accurate.

[0079] In some embodiments, the image refresh period includes one data writing stage and at least one light-emitting maintaining stage, and the number of pulses included in the data writing stage and each light-emitting maintaining stage is the same.

[0080] In some embodiments, the number of groups is greater than the number of light-emitting maintaining stages.

[0081] ​In some embodiments, for each group, the initial duty cycle is adjusted to obtain a target duty cycle of the light-emitting control signal under the group, including: taking the preset duty cycle corresponding to the group as a step value, adjusting the initial duty cycle at least once, obtaining a flicker value corresponding to the duty cycle after adjustment, the flicker value representing the intensity of the flicker phenomenon generated by the display panel during refreshing; and obtaining the target duty cycle based on the flicker value.

[0082] Optionally, in the case that the initial refresh frequency is 120HZ and the target refresh frequency is 30HZ, if the pulses in the light-emitting maintaining stage in one image refreshing period under 30HZ are divided into 4 groups, in the process of adjusting the initial duty cycle once, the duty cycles of the 4 groups can be adjusted by different degrees based on the preset duty cycle, for example, the adjustment value of the duty cycle corresponding to the first group is 1 preset duty cycle, the adjustment values of the duty cycles corresponding to the second group and the third group are both 2 preset duty cycles, and the adjustment value of the duty cycle corresponding to the fourth group is 3 preset duty cycles, then the refresh frequency of the display panel is controlled to decrease from 120HZ to 30HZ, and the flicker value in the process of decreasing the refresh frequency is detected.

[0083] In the embodiment, the initial duty cycle is adjusted at least once by taking the preset duty cycle corresponding to the group as a step value, and a flicker value corresponding to the duty cycle after adjustment is obtained, so that the target duty cycle obtained based on the flicker value is more accurate.

[0084] In some embodiments, the target duty cycle is obtained based on the flicker value, including: in the case that the number of adjustments reaches the preset number of times corresponding to the group, the minimum flicker value in all the flicker values is obtained, and the duty cycle corresponding to the minimum flicker value is determined as the target duty cycle.

[0085] Optionally, in the case that the measured flicker value is the minimum flicker value, it indicates that the flicker degree is the lowest in the process of decreasing the refresh frequency.

[0086] In the embodiment, the duty cycle corresponding to the minimum flicker value is determined as the target duty cycle, so that adjusting the brightness of the display panel under the target refresh frequency based on the target duty cycle can improve the flicker visual effect in the process of decreasing the refresh frequency to the greatest extent.

[0087] In some embodiments, the time interval between each two adjustments is a row period under the target refresh frequency, and the row period is the time length required for scanning one row of pixels.

[0088] In some embodiments, the width of the pulse in the group is adjusted based on the target brightness value and the target duty cycle, including: in the process of displaying under the target refresh frequency, a current brightness value corresponding to each pulse in the image refreshing period is obtained; a target pulse in the group is determined based on the target brightness value and the current brightness value; and the width of the target pulse is adjusted based on the target duty cycle.

[0089] Optionally, after determining the target pulses in each group, all the target pulses are sorted in an order from small to large based on a difference between the target brightness value and the current brightness value of each target pulse; so that the difference between the duty cycle of the group after adjustment and the corresponding target duty cycle is within a preset duty cycle range, a corresponding width adjustment value of each target pulse is determined, wherein the corresponding width adjustment value of the target pulse increases in order from front to back according to the sorting result; and the width of the target pulse is adjusted based on the width adjustment value.

[0090] In this embodiment, the target pulses in the group are determined based on the target brightness value and the current brightness value, and the width of the target pulse is adjusted based on the target duty cycle, so that the display panel displays according to the adjusted width of the target pulse at the target refresh frequency, which can improve the flicker visual effect during the refresh frequency reduction process to the greatest extent.

[0091] In some embodiments, determining the target pulses in the group based on the target brightness value and the current brightness value comprises: obtaining a brightness value difference between the target brightness value corresponding to the pulse and the current brightness value corresponding to the pulse for the pulse in the group; and determining the pulse as a target pulse in the group if the brightness value difference is greater than a preset brightness value.

[0092] Optionally, if the brightness value difference is greater than the preset brightness value, it means that the difference between the current brightness value and the target brightness value of the pulse is too large, which will aggravate the flicker visual effect during the refresh frequency reduction process, and therefore, the width of the pulse needs to be adjusted to reduce the difference between the current brightness value and the target brightness value of the pulse.

[0093] In this embodiment, the pulse is determined as a target pulse in the group if the brightness value difference is greater than the preset brightness value, which can effectively improve the flicker visual effect during the refresh frequency reduction process.

[0094] In some embodiments, the method further comprises: obtaining the brightness value corresponding to each pulse in the first image refresh period during the display at the target refresh frequency; obtaining the pulse corresponding to the pulse in the first image refresh period for the pulse in any image refresh period other than the first image refresh period; and obtaining the target brightness value corresponding to the pulse based on the brightness value of the pulse corresponding to the pulse.

[0095] Optionally, in the process of reducing the refresh frequency, the brightness of the display panel in the first image refresh period at the target refresh frequency does not change relative to the brightness at the initial refresh frequency, in which case the brightness in the first image refresh period at the target refresh frequency can be taken as the reference brightness value, and based on the pulse correspondence relationship between the first image refresh period and the subsequent image refresh period, for each pulse in the light-emitting maintaining stage in the subsequent image refresh period, the reference brightness value of the corresponding pulse in the first image refresh period is taken as the reference to determine the target brightness value corresponding to the pulse in the subsequent image refresh period.

[0096] In this embodiment, the brightness value corresponding to each pulse in the first image refresh period is obtained; for a pulse in any image refresh period other than the first image refresh period, a pulse corresponding to the pulse in the first image refresh period is obtained; and based on the brightness value of the pulse corresponding to the pulse, a target brightness value corresponding to the pulse is obtained. The target brightness value thus determined is more accurate.

[0097] In some embodiments, adjusting the brightness of the display panel at the target refresh frequency includes: based on the adjusted pulse width, driving the shift register corresponding to the light-emitting control signal to generate a target light-emitting control signal; and based on the target light-emitting control signal, controlling the corresponding pixels in the display panel to emit light.

[0098] The shift register (SR) is a commonly used digital circuit for generating a scanning signal to control the pixel row on the display panel.

[0099] In this embodiment, based on the adjusted pulse width, the shift register corresponding to the light-emitting control signal is driven to generate a target light-emitting control signal; and based on the target light-emitting control signal, the corresponding pixels in the display panel are controlled to emit light. This way of driving and controlling the pixels is more accurate.

[0100] In some embodiments, the method further includes: for each pixel in the display panel, based on the target light-emitting control signal, obtaining a charging period of the pixel in the image refresh period; and in the charging period, by injecting electric charges into the pixel to make the pixel in an open state.

[0101] The charging period refers to the period of charging the capacitor of the pixel in the image refresh period, so that the capacitor reaches the required voltage level.

[0102] In this embodiment, in the charging period, electric charges are injected into the pixel to make the pixel in an open state, which enables more precise control of the light-emitting process of the pixel.

[0103] In some embodiments, the brightness of the display panel is positively correlated with the target duty cycle.

[0104] In some embodiments, the display panel is an OLED display panel.

[0105] In one embodiment, another method for adjusting the brightness of a display panel is provided, the method comprising the following steps:

[0106] When the refresh frequency of the display panel drops from the initial refresh frequency to the target refresh frequency, for any image refresh cycle when displaying at the target refresh frequency, obtain the multiple pulses included in the light-emitting maintenance stage of the image refresh cycle, the initial duty cycle of the light-emitting control signal at the target refresh frequency, and the target brightness value corresponding to each pulse in the light-emitting maintenance stage, and divide the multiple pulses into multiple groups; for each group, adjust the initial duty cycle to obtain the target duty cycle of the light-emitting control signal in the group; based on the target brightness value and the target duty cycle, adjust the width of the pulses in the group to adjust the brightness of the display panel at the target refresh frequency.

[0107] The process of dividing multiple pulses into multiple groups is as follows: Figure 11 As shown, Figure 11 Each data writing phase or light maintenance phase includes 3 DC (Direct Current) pulses and 16 PWM (Pulse Width Modulation) pulses. In the process of grouping pulses, both DC pulses and PWM pulses need to be grouped. Figure 11 The refresh frequency of the display panel is reduced from 120HZ to 60HZ, 40HZ and 30HZ respectively. Taking PWM pulse grouping as an example, since each image refresh cycle at 60HZ only includes one light-emitting holding stage, the number of groups (Hold Group 1) is at least 2. Since each image refresh cycle at 40HZ includes 2 light-emitting holding stages, the number of groups (Hold Group 2) is at least 3. Since each image refresh cycle at 30HZ includes 3 light-emitting holding stages, the number of groups (Hold Group 3) is at least 4.

[0108] For example, when the target refresh frequency is 30 Hz, the number of pulses included in each light-emitting maintenance stage is 16. Since each image refresh cycle at 30 Hz includes 3 light-emitting maintenance stages, the number of groups can be determined to be 4. According to the corresponding time sequence of the pulses, the 48 pulses included in the 3 light-emitting maintenance stages are evenly distributed to 4 groups, and each group includes 12 pulses.

[0109] The brightness adjustment method of the display panel in this embodiment is similar toFigure 6 The improvement degree of the prior art on the flicker visual effect in the refresh frequency reduction process is shown in Table 1.

[0110] Table 1

[0111]

[0112] The first column in Table 1 represents the luminance adjustment value, the second column represents the Figure 6 flicker value reduced by the prior art, and the third column represents the flicker value reduced by the method in the embodiment. As can be seen from Table 1, when the luminance adjustment value is in the range of 2 nit to 20 nit, the flicker value reduced by the method in the embodiment is greater, and the improvement effect on the flicker visual effect is better.

[0113] It should be understood that, although each step in the flowchart involved in each embodiment as described above is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0114] Based on the same inventive concept, the embodiment of the present application also provides a display panel luminance adjustment device for implementing the display panel luminance adjustment method described above. The problem-solving implementation scheme provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more display panel luminance adjustment device embodiments provided below can refer to the limitations of the display panel luminance adjustment method described above, and will not be repeated here.

[0115] In one exemplary embodiment, as shown in Figure 12 a display panel luminance adjustment device 1200 is provided, comprising: an acquisition module 1201, a first adjustment module 1202, and a second adjustment module 1203, wherein:

[0116] The acquisition module 1201 is configured to, in a case where the refresh frequency of the display panel is decreased from an initial refresh frequency to a target refresh frequency, acquire, for any one image refresh period when display is performed at the target refresh frequency, a plurality of pulses included in a light emitting maintaining stage of the image refresh period, an initial duty cycle of a light emitting control signal at the target refresh frequency, and a target brightness value corresponding to each pulse in the light emitting maintaining stage, and divide the plurality of pulses into a plurality of groups.

[0117] The first adjusting module 1202 is configured to, for each group, adjust the initial duty cycle to obtain a target duty cycle of the light emitting control signal in the group.

[0118] The second adjusting module 1203 is configured to adjust the width of the pulses in the group based on the target brightness value and the target duty cycle, to adjust the brightness of the display panel at the target refresh frequency.

[0119] In some embodiments, the acquisition module 1201 is further configured to acquire the number of light emitting maintaining stages of the image refresh period and the number of pulses included in each light emitting maintaining stage; and divide the pulses included in all light emitting maintaining stages of the image refresh period into a plurality of groups based on the number of light emitting maintaining stages and the number of pulses.

[0120] In some embodiments, the acquisition module 1201 is further configured to: the image refresh period includes one data writing stage and at least one light emitting maintaining stage, and the number of pulses included in the data writing stage is the same as that included in each light emitting maintaining stage.

[0121] In some embodiments, the acquisition module 1201 is further configured to: the number of groups is greater than the number of light emitting maintaining stages.

[0122] In some embodiments, the first adjusting module 1202 includes:

[0123] The first adjusting submodule is configured to adjust the initial duty cycle at least once with the preset duty cycle corresponding to the group as a step value, acquire a flicker value corresponding to the duty cycle obtained after adjustment, and the flicker value represents the intensity of the flicker phenomenon generated by the display panel when refreshing.

[0124] The first acquisition submodule is configured to acquire the target duty cycle based on the flicker value.

[0125] In some embodiments, the first acquisition submodule is further configured to, in a case where the number of adjustments reaches a preset number of times corresponding to the group, acquire a minimum flicker value in all flicker values, and determine the duty cycle corresponding to the minimum flicker value as the target duty cycle.

[0126] In some embodiments, the first adjusting module 1202 is further configured to set a time interval between each two adjustments as a row period at the target refresh frequency, where the row period is a time length required for scanning one row of pixels.

[0127] In some embodiments, the second adjusting module 1203 includes:

[0128] The second obtaining sub-module is configured to obtain a current luminance value corresponding to each pulse in the image refresh period during the display at the target refresh frequency.

[0129] The determining sub-module is configured to determine a target pulse in the group based on the target luminance value and the current luminance value.

[0130] The second adjusting sub-module is configured to adjust a width of the target pulse based on the target duty cycle.

[0131] In some embodiments, the determining sub-module is further configured to, for a pulse in the group, obtain a luminance value difference between a target luminance value corresponding to the pulse and a current luminance value corresponding to the pulse; and determine the pulse as the target pulse in the group if the luminance value difference is greater than a preset luminance value.

[0132] In some embodiments, the obtaining module 1201 is further configured to, during the display at the target refresh frequency, obtain a luminance value corresponding to each pulse in a first image refresh period; for a pulse in any image refresh period other than the first image refresh period, obtain a pulse corresponding to the pulse in the first image refresh period; and obtain a target luminance value corresponding to the pulse based on a luminance value of the pulse corresponding to the pulse.

[0133] In some embodiments, the second adjusting module 1203 is further configured to, based on the adjusted pulse width, drive a shift register corresponding to the light-emitting control signal to generate a target light-emitting control signal; and control a corresponding pixel in the display panel to emit light based on the target light-emitting control signal.

[0134] In some embodiments, the second adjusting module 1203 is further configured to, for each pixel in the display panel, based on the target light-emitting control signal, obtain a charging period of the pixel in the image refresh period; and in the charging period, inject charges into the pixel to make the pixel in an open state.

[0135] In some embodiments, the luminance adjusting apparatus 1200 of the display panel is specifically configured to have a positive correlation between a luminance of the display panel and the target duty cycle.

[0136] In some embodiments, the brightness adjustment apparatus 1200 of the display panel is also used for the display panel being an OLED display panel.

[0137] The various modules in the brightness adjustment apparatus of the display panel can be implemented by software, hardware, and combinations thereof, in whole or in part. The various modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in a computer device in software form, so as to be called and executed by a processor to perform the operations corresponding to the various modules.

[0138] In an exemplary embodiment, a computer device, which can be a terminal, is provided, and an internal structure diagram of the computer device can be as shown in Figure 13 The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface, the display unit, and the input device are connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for running the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals, and the wireless communication can be implemented through WIFI, mobile cellular network, Near Field Communication (NFC), or other technologies. The computer program is executed by the processor to implement a brightness adjustment method of a display panel.

[0139] Those skilled in the art can understand that Figure 13 The structure shown in the above

[0140] In one example embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program: in a case where a refresh frequency of a display panel is decreased from an initial refresh frequency to a target refresh frequency, for any one image refresh period when displaying at the target refresh frequency, obtaining a plurality of pulses included in a light emitting maintaining stage of the image refresh period, an initial duty cycle of a light emitting control signal at the target refresh frequency, and a target brightness value corresponding to each pulse in the light emitting maintaining stage, and dividing the plurality of pulses into a plurality of groups; for each group, adjusting the initial duty cycle to obtain a target duty cycle of the light emitting control signal under the group; and based on the target brightness value and the target duty cycle, adjusting a width of the pulses in the group to adjust a brightness of the display panel at the target refresh frequency.

[0141] In one embodiment, the dividing the plurality of pulses into a plurality of groups implemented by the processor when executing the computer program comprises: obtaining a number of light emitting maintaining stages of the image refresh period and a number of pulses included in each light emitting maintaining stage; and based on the number of light emitting maintaining stages and the number of pulses, dividing the pulses included in all light emitting maintaining stages of the image refresh period into a plurality of groups.

[0142] In one embodiment, the image refresh period implemented by the processor when executing the computer program comprises one data writing stage and at least one light emitting maintaining stage, and the number of pulses included in the data writing stage is the same as the number of pulses included in each light emitting maintaining stage.

[0143] In one embodiment, the number of groups implemented by the processor when executing the computer program is greater than the number of light emitting maintaining stages.

[0144] In one embodiment, the adjusting the initial duty cycle to obtain the target duty cycle of the light emitting control signal under the group for each group implemented by the processor when executing the computer program comprises: adjusting the initial duty cycle at least once with a preset duty cycle corresponding to the group as a step value, obtaining a flicker value corresponding to the adjusted duty cycle, the flicker value representing an intensity of a flicker phenomenon generated by the display panel when refreshing; and based on the flicker value, obtaining the target duty cycle.

[0145] In one embodiment, the obtaining the target duty cycle based on the flicker value implemented by the processor when executing the computer program comprises: in a case where a number of adjustments reaches a preset number corresponding to the group, obtaining a minimum flicker value among all flicker values, and determining a duty cycle corresponding to the minimum flicker value as the target duty cycle.

[0146] In one embodiment, the time interval between each two adjustments implemented by the processor when executing the computer program is a row period at the target refresh frequency, the row period being a time length required for scanning a row of pixels.

[0147] In one embodiment, the adjusting, by the processor when executing the computer program, the width of the pulse within the group based on the target brightness value and the target duty cycle comprises: obtaining a current brightness value corresponding to each pulse in the image refresh period during the display at the target refresh frequency; determining a target pulse within the group based on the target brightness value and the current brightness value; adjusting the width of the target pulse based on the target duty cycle.

[0148] In one embodiment, the determining, by the processor when executing the computer program, the target pulse within the group based on the target brightness value and the current brightness value comprises: obtaining a brightness value difference between the target brightness value corresponding to the pulse and the current brightness value corresponding to the pulse for the pulse within the group; and determining the pulse as the target pulse within the group in a case that the brightness value difference is greater than a preset brightness value.

[0149] In one embodiment, the method implemented by the processor when executing the computer program further comprises: obtaining a brightness value corresponding to each pulse in a first image refresh period during the display at the target refresh frequency; obtaining a pulse corresponding to the pulse in the first image refresh period for the pulse in any one image refresh period other than the first image refresh period; and obtaining a target brightness value corresponding to the pulse based on the brightness value of the pulse corresponding to the pulse.

[0150] In one embodiment, the adjusting, by the processor when executing the computer program, the brightness of the display panel at the target refresh frequency comprises: generating a target light-emitting control signal by a shift register corresponding to the light-emitting control signal based on the adjusted pulse width; and controlling a corresponding pixel in the display panel to emit light based on the target light-emitting control signal.

[0151] In one embodiment, the method implemented by the processor when executing the computer program further comprises: obtaining a charging period of the pixel in the image refresh period based on the target light-emitting control signal for each pixel in the display panel; and injecting charges into the pixel to make the pixel in an open state in the charging period.

[0152] In one embodiment, the brightness of the display panel and the target duty cycle are positively correlated.

[0153] In one embodiment, the display panel realized by the processor executing the computer program is an OLED display panel.

[0154] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0155] It can be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments of each method. In the embodiments provided in the present application, any reference to memory, database or other medium can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (Resistive Random Access Memory, ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (Artificial Intelligence, AI) processor, etc., without being limited thereto.

[0156] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, any combination of these technical features is deemed to be within the scope of the present application.

[0157] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for adjusting the brightness of a display panel, characterized in that: The method comprises: In a case where a refresh frequency of a display panel is decreased from an initial refresh frequency to a target refresh frequency, for any one image refresh period when display is performed at the target refresh frequency, an initial duty cycle of a plurality of pulses included in a light emitting maintaining stage of the image refresh period, a light emitting control signal at the target refresh frequency, and a target brightness value corresponding to each pulse in the light emitting maintaining stage are acquired, and the plurality of pulses are divided into a plurality of groups; For each group, the initial duty cycle is adjusted to obtain a target duty cycle of the light emitting control signal under the group; The adjusting of the initial duty cycle to obtain the target duty cycle of the light emitting control signal under the group comprises: adjusting the initial duty cycle at least once with a preset duty cycle corresponding to the group as a step value, acquiring a flicker value corresponding to the duty cycle obtained after adjustment, the flicker value representing the intensity of flicker generated by the display panel during refresh; and acquiring the target duty cycle based on the flicker value; Based on the target brightness value and the target duty cycle, the width of the pulse in the group is adjusted to adjust the brightness of the display panel at the target refresh frequency.

2. The method of claim 1, wherein, The dividing of the plurality of pulses into a plurality of groups comprises: The number of light emitting maintaining stages of the image refresh period and the number of pulses included in each light emitting maintaining stage are acquired; Based on the number of light emitting maintaining stages and the number of pulses, the pulses included in all light emitting maintaining stages of the image refresh period are divided into a plurality of groups.

3. The method of claim 2, wherein, The image refresh period comprises one data writing stage and at least one light emitting maintaining stage, and the number of pulses included in the data writing stage and each light emitting maintaining stage is the same.

4. The method of claim 2, wherein, The number of groups is greater than the number of light emitting maintaining stages.

5. The method of claim 1, wherein, The acquiring of the target duty cycle based on the flicker value comprises: In a case where the number of adjustments reaches a preset number corresponding to the group, the minimum flicker value among all flicker values is acquired, and the duty cycle corresponding to the minimum flicker value is determined as the target duty cycle.

6. The method of claim 1, wherein, The time interval between each two adjustments is a row period at the target refresh frequency, and the row period is the time length required for scanning one row of pixels.

7. The method of claim 1, wherein, The adjusting of the width of the pulse in the group based on the target brightness value and the target duty cycle comprises: During display at the target refresh frequency, a current brightness value corresponding to each pulse in the image refresh period is acquired; Based on the target brightness value and the current brightness value, a target pulse in the group is determined; The width of the target pulse is adjusted based on the target duty cycle.

8. The method of claim 7, wherein, The determining of the target pulse in the group based on the target brightness value and the current brightness value comprises: For the pulse in the group, a brightness value difference between the target brightness value corresponding to the pulse and the current brightness value corresponding to the pulse is acquired; In a case where the brightness value difference is greater than a preset brightness value, the pulse is determined as the target pulse in the group.

9. The method of claim 8, wherein, The method further comprises: In a process of displaying according to the target refresh frequency, a luminance value corresponding to each pulse in a first image refresh period is obtained; For a pulse in any image refresh period other than the first image refresh period, a pulse corresponding to the pulse in the first image refresh period is obtained; Based on the luminance value of the pulse corresponding to the pulse, a target luminance value corresponding to the pulse is obtained.

10. The method of claim 1, wherein, The adjusting of the luminance of the display panel at the target refresh frequency comprises: Based on the adjusted pulse width, a target light-emitting control signal is generated by a shift register corresponding to the light-emitting control signal; Based on the target light-emitting control signal, the corresponding pixel in the display panel is controlled to emit light.

11. The method of claim 10, wherein, The method further comprises: For each pixel in the display panel, based on the target light-emitting control signal, a charging period of the pixel in the image refresh period is obtained; In the charging period, the pixel is in an open state by injecting electric charges into the pixel.

12. The method of claim 1, wherein, The luminance of the display panel is positively correlated with the target duty cycle.

13. The method of claim 1, wherein, The display panel is an OLED display panel.

14. A luminance adjusting device of a display panel, characterized by comprising: The apparatus comprises: An obtaining module, configured to, in a case where a refresh frequency of a display panel is decreased from an initial refresh frequency to a target refresh frequency, for any image refresh period when displaying according to the target refresh frequency, obtain a plurality of pulses included in a light-emitting maintaining stage of the image refresh period, an initial duty cycle of a light-emitting control signal at the target refresh frequency, and a target luminance value corresponding to each pulse in the light-emitting maintaining stage, and divide the plurality of pulses into a plurality of groups; A first adjusting module, configured to, for each group, adjust the initial duty cycle to obtain a target duty cycle of the light-emitting control signal under the group; The first adjusting module comprises: A first adjusting submodule, configured to adjust the initial duty cycle at least once with a preset duty cycle corresponding to the group as a step value, obtain a flicker value corresponding to the adjusted duty cycle, and the flicker value represents an intensity of a flicker phenomenon generated by the display panel when refreshing; A first obtaining submodule, configured to obtain the target duty cycle based on the flicker value; A second adjusting module, configured to adjust a width of a pulse in the group based on the target luminance value and the target duty cycle, so as to adjust a luminance of the display panel at the target refresh frequency.

15. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that, The processor, when executing the computer program, implements the steps of the method in any one of claims 1 to 13.

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