WO2024093586A1 - 图像显示方法、ddic芯片、显示屏模组及终端 - Google Patents

图像显示方法、ddic芯片、显示屏模组及终端 Download PDF

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Publication number
WO2024093586A1
WO2024093586A1 PCT/CN2023/121647 CN2023121647W WO2024093586A1 WO 2024093586 A1 WO2024093586 A1 WO 2024093586A1 CN 2023121647 W CN2023121647 W CN 2023121647W WO 2024093586 A1 WO2024093586 A1 WO 2024093586A1
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WIPO (PCT)
Prior art keywords
cycle
luminous
duty cycle
display
brightness
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PCT/CN2023/121647
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English (en)
French (fr)
Inventor
高延凯
王月文
孔祥永
刘长瑜
Original Assignee
Oppo广东移动通信有限公司
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Publication of WO2024093586A1 publication Critical patent/WO2024093586A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix

Definitions

  • the embodiments of the present application relate to the field of display technology, and in particular to an image display method, a display driver circuit (Display Driver Integrated Circuit, DDIC) chip, a display screen module and a terminal.
  • a display driver circuit Display Driver Integrated Circuit, DDIC
  • DDIC Display Driver Integrated Circuit
  • AMOLED Active-Matrix Organic Light-Emitting Diode
  • terminals such as smart phones, tablet computers, and wearable devices.
  • the DDIC chip controls the periodic switching of the light-emitting diodes in the display screen, that is, periodically controls the light-emitting diodes to light up and go out to ensure that the display screen is in a continuously bright state.
  • the embodiment of the present application provides an image display method, a DDIC chip, a display screen module and a terminal.
  • the technical solution is as follows:
  • an embodiment of the present application provides an image display method, the method is used for a display driver circuit DDIC chip of a display screen, the method comprising:
  • the emission duty ratio of the EM cycle during the emission (EM) scanning process is adjusted based on the current display parameters.
  • the emission duty ratio refers to the proportion of the emission duration in the EM cycle.
  • the EM cycle includes a light-emitting stage and a shutdown stage. K is a positive integer.
  • an embodiment of the present application provides a DDIC chip, wherein the DDIC chip is applied to a display screen, and the DDIC chip is used for:
  • the luminous duty ratio of the EM cycle during the luminous scanning process is adjusted based on the current display parameters.
  • the luminous duty ratio refers to the proportion of the luminous duration in the EM cycle.
  • the EM cycle includes a luminous phase and a closed phase. K is a positive integer.
  • an embodiment of the present application provides a display screen module, which includes a display screen and a DDIC chip, wherein the DDIC chip is used to drive the display screen, and the DDIC chip is used to implement the image display method described in the above aspects.
  • an embodiment of the present application provides a terminal, which includes an application processor (AP), a display screen and a DDIC chip, wherein the AP and the DDIC chip are connected via a mobile industry processor interface (MIPI), and the DDIC chip is used to implement the image display method described in the above aspects.
  • AP application processor
  • MIPI mobile industry processor interface
  • FIG1 is a schematic diagram of the relationship between screen brightness and time at different refresh rates in the related art
  • FIG2 is a method flow chart of an image display method provided by an exemplary embodiment of the present application.
  • FIG3 is a schematic diagram of using PWM technology to adjust the duty cycle of EM periodic light emission
  • FIG4 is a schematic diagram of the relationship between screen brightness and time after adjusting the EM cycle light emission duty cycle provided by an exemplary embodiment of the present application;
  • FIG5 is a schematic diagram of the relationship between screen brightness and time before the EM cycle light emission duty ratio is adjusted according to an exemplary embodiment of the present application
  • FIG6 is a schematic diagram of the relationship between screen brightness and time after the EM cycle light emission duty ratio is adjusted according to an exemplary embodiment of the present application
  • FIG7 is a schematic diagram showing the relationship between screen brightness and time before the EM cycle duty cycle is adjusted, in which the brightness change curve represents the irregular correlation between brightness and EM cycle;
  • FIG8 is a schematic diagram showing the relationship between screen brightness and time after the EM cycle duty cycle is adjusted, when the brightness change curve represents the irregular correlation between brightness and EM cycle;
  • FIG9 is a method flow chart of an image display method provided by another exemplary embodiment of the present application.
  • FIG10 is a schematic diagram showing the relationship between screen brightness and time variation when adjusting the luminous duty ratio of a specified EM cycle during EM scanning;
  • FIG. 11 is a structural block diagram of a terminal provided by an exemplary embodiment of the present application.
  • Refresh rate The number of times the display screen refreshes the image per second, in Hz.
  • the smoothness of the screen display is related to the refresh rate, and the higher the refresh rate, the smoother the screen display.
  • the refresh rate of the display screen is different in different scenarios to meet the screen display requirements in different scenarios.
  • the refresh rate of the display screen is set to 10Hz; in a video playback scenario, the video screen displayed on the screen will change in a short period of time, and since the video frame rate is usually lower than 60Hz, the refresh rate of the display screen is set to 60Hz; in a game scenario, since the game screen changes quickly and the requirements for the smoothness of the screen display are high, the refresh rate of the display screen is set to 120Hz.
  • Emission (EM) cycle The EM signal is a panel row switch signal used to control whether the current row of pixels emits light.
  • the switching cycle of the switch signal is called the EM cycle.
  • Each EM cycle is divided into two stages: emission (Emission ON) and emission OFF.
  • the emission duration i.e., emission stage
  • the proportion of the duration of the segment in an EM cycle is called the emission duty cycle.
  • EM frequency is the frequency of generating EM signal.
  • EM frequency is an integer multiple of refresh rate, that is, multiple EM switches are performed between two image refreshes, and the ratio of EM frequency to refresh rate is the number of EM pulses (EM-pulse-no) corresponding to a single image refresh.
  • the refresh rate is 60Hz
  • the EM frequency is 240Hz or 360Hz
  • the corresponding EM-pulse-no is 4 and 6 respectively.
  • the DDIC chip controls the image refresh while sending out EM signals to control the display screen to emit light, so that the display screen can display the corresponding image.
  • the DDIC chip needs to control the display screen to emit light multiple times between two adjacent image refreshes.
  • LTPS Low Temperature Poly-silicon
  • the substrate leakage current is large, resulting in severe attenuation of the screen brightness after completing an image scan.
  • the screen brightness increases instantly because the voltage is re-supplied to the current row of pixel circuits, and eventually the screen flickers.
  • the EM frequency of the LTPS display screen as 360 Hz as an example, as shown in Figure 1, it shows the changing relationship between screen brightness and time at different refresh rates, where the horizontal axis represents time and the vertical axis represents screen brightness.
  • the value marked on the left side of Figure 1 refers to the refresh rate. Since the EM frequency is often an integer multiple of the refresh rate, there are multiple EM cycles between two adjacent image refreshes. As shown in Figure 1, when the refresh rate is 90Hz, the EM frequency is 360Hz, so there should be 4 EM cycles between two adjacent image refreshes. Similarly, when the refresh rate is 40Hz, there are 9 EM cycles between two adjacent image refreshes.
  • the DDIC chip is used to adjust the luminous duty cycle of the EM cycle during the EM scanning process, compensate for the screen brightness changes caused by leakage, and avoid the problem of screen brightness jumps when the image is refreshed, thereby alleviating the screen flickering phenomenon and improving the image display quality of the display screen.
  • FIG2 is a flow chart of an image display method provided by an exemplary embodiment of the present application. This embodiment is described by taking the method used in a DDIC chip as an example. The method includes:
  • Step 201 during the display process of the Kth frame image, the luminous duty ratio of the EM cycle during the EM scanning process is adjusted based on the current display parameters.
  • the luminous duty ratio refers to the proportion of the luminous duration in the EM cycle.
  • the EM cycle includes a luminous phase and a closed phase. K is a positive integer.
  • the image frame data of the Kth frame of image may be a new image frame transmitted by the AP.
  • Image frame data, or the image frame data is a frame of historical image frame data cached by the DDIC chip (ie, the DDIC chip will repeatedly refresh based on the historical image frame data when no new image frame data is received).
  • the DDIC chip adjusts the light emission duty ratio of the EM cycle during the EM scanning process based on the current display parameters.
  • the DDIC chip performs EM scanning according to the initial luminous duty cycle during the image scanning process based on the image frame data of the Kth frame image; when the image scanning is completed, the DDIC chip adjusts the luminous duty cycle of the EM cycle during the EM scanning process based on the current display parameters.
  • the DDIC chip before performing the K+1th frame image scanning, the DDIC chip adjusts the luminous duty cycle of the EM cycle to the initial value, so that during the image scanning process of the K+1th frame image, the EM scanning is performed based on the initial luminous duty cycle, and when the K+1th frame image scanning is completed, the luminous duty cycle of the EM cycle during the EM scanning process is adjusted.
  • the DDIC chip adjusts the light emission duty ratio of the EM cycle during the EM scanning process based on the changing characteristics of the screen brightness during the EM scanning process.
  • the luminous duty cycle refers to the proportion of the luminous duration in the EM cycle, which includes the luminous phase and the off phase.
  • the luminous duty cycle will affect the screen brightness. The higher the luminous duty cycle, the longer the luminous duration, and accordingly, the higher the screen brightness; the smaller the luminous duty cycle, the shorter the luminous duration, and the lower the screen brightness.
  • the DDIC chip can increase or decrease the luminous duty cycle of the EM cycle. Since the human eye perceives brightness as a cumulative process, after increasing the luminous duty cycle of the EM cycle, the cumulative brightness of the display screen in the EM cycle increases, and the human eye feels that the brightness of the display screen has increased; conversely, after reducing the luminous duty cycle of the EM cycle, the cumulative brightness of the display screen in the EM cycle decreases, and the human eye feels that the brightness of the display screen has decreased.
  • the DDIC chip can adjust the luminous duty cycle within the EM cycle through pulse width modulation (PWM) technology.
  • PWM pulse width modulation
  • FIG3 is a schematic diagram of using PWM technology to adjust the EM cycle luminous duty cycle.
  • the high level indicates the luminous stage
  • the low level indicates the off stage.
  • PWM technology uses square wave modulation, and the luminous duty cycle is adjusted by adjusting the duration of the high and low levels.
  • t1 to t5 is the duration of two EM cycles
  • the first EM cycle is from t1 to t3
  • the second cycle is from t3 to t5 .
  • t1 to t2 is the luminous stage
  • t2 to t3 is the off stage.
  • the luminous duty cycle is the ratio of the luminous duration to the EM cycle duration.
  • the luminous duration of the first EM cycle is t 2 -t 1
  • the luminous duty cycle of the first EM cycle is t 2 -t 1 /t 3 -t 1
  • the luminous duty cycle of the second EM cycle is t 4 -t 3 /t 5 -t 3 .
  • the high level duration of the second EM cycle increases, thereby making the luminous duty cycle of the second EM cycle greater than the luminous duty cycle of the first EM cycle, that is, t 4 -t 3 /t 5 -t 3 >t 2 -t 1 /t 3 -t 1 .
  • Figure 4 is a DDIC based on Figure 1.
  • the schematic diagram of the relationship between screen brightness and time the horizontal axis represents time, and the vertical axis represents screen brightness.
  • the refresh rates from top to bottom are 120Hz, 90Hz, 60Hz and 40Hz respectively.
  • the DDIC chip increases the luminous duty cycle of the 2nd and 3rd EM cycles by extending the luminous duration in the 2nd and 3rd EM cycles; when the refresh rate is 90Hz, the DDIC chip increases the luminous duty cycle of the 2nd, 3rd and 4th EM cycles by extending the luminous duration in the 2nd, 3rd and 4th EM cycles; when the refresh rate is 60Hz, the DDIC chip increases the luminous duty cycle of the 2nd to 6th EM cycles by extending the luminous duration in the 2nd to 6th EM cycles; when the refresh rate is 40, the DDIC chip increases the luminous duty cycle of the 2nd to 9th EM cycles by extending the luminous duration in the 2nd to 9th EM cycles.
  • the brightness within each EM cycle increases, thereby compensating for the brightness reduction caused by screen leakage, so that the screen brightness remains stable during the EM scanning process, thereby avoiding brightness jumps between adjacent image frame display processes, and reducing the user's perception of brightness changes during the display of adjacent image frames.
  • the luminous duty cycle of the EM cycle changes with time, so that the brightness difference of the cumulative brightness of the display screen in different EM cycles is within the difference range.
  • the brightness difference range is the brightness change amplitude that the human eye cannot perceive.
  • the brightness change amplitude that the human eye can perceive is 0.8%, that is, the cumulative brightness change amplitude of adjacent EM cycles cannot be perceived by the human eye within 0.8%, but it can be perceived by the human eye if it exceeds 0.8%.
  • the DDIC chip adjusts the luminous duty cycle of the EM cycle during the EM scanning process to adjust the luminous duration within the EM cycle, thereby improving the stability of the screen brightness during the image display process, avoiding the flickering phenomenon caused by changes in the screen brightness, and helping to improve the image display quality of the display screen.
  • the minimum refresh rate supported by the display is usually higher; after adopting the above-mentioned EM cycle adjustment mechanism, the screen flickering problem of the display can be alleviated, which is particularly obvious in low refresh rate scenarios. Therefore, the display can support a lower refresh rate, which on the one hand improves the frequency conversion range of the display, and on the other hand helps to reduce the display power consumption during the display process.
  • the luminous duty cycle of the EM cycle during the EM scan is adjusted based on the current display parameters, including:
  • the luminous duty cycle curve is used to characterize the corresponding relationship between the luminous duty cycle and the EM period, different display parameters correspond to different luminous duty cycle curves, and the display parameters include at least one of a refresh rate and a screen brightness;
  • the luminescence duty cycle of the EM cycle during the EM scanning process is adjusted based on the luminescence duty cycle curve.
  • the luminous duty cycle curve is generated based on a brightness change curve of the display screen during display at a specific frequency when the luminous duty cycle is not adjusted.
  • the luminous duty cycle curve when the brightness change curve represents that the brightness decreases over time, the luminous duty cycle curve
  • the characterized luminescence duty cycle is positively correlated with the EM period
  • the luminous duty ratio represented by the luminous duty ratio curve is negatively correlated with the EM period
  • the luminous duty cycle curve represents that the luminous duty cycle in the first time interval is negatively correlated with the EM period, and the luminous duty cycle in the second time interval is positively correlated with the EM period.
  • adjust the emission duty cycle of a specified EM cycle during the EM scan including:
  • the light emission duty ratio of the specified EM cycle during the EM scanning process is adjusted, wherein the time interval between adjacent specified EM cycles is the target cycle interval.
  • adjusting the luminous duty ratio of the EM cycle during the EM scanning process based on the current display parameters includes:
  • the method also includes:
  • the luminous duty cycle of the EM cycle is adjusted to an initial value.
  • adjusting the luminous duty ratio of the EM cycle during the EM scanning process based on the current display parameters includes:
  • the luminous duty cycle of the EM cycle during the EM scanning process is adjusted based on the current display parameters.
  • the display screen is a low-temperature polycrystalline silicon LTPS display screen, a low-temperature polycrystalline oxide LTPO display screen, or an oxide display screen.
  • the light emission duty cycle of the EM cycle varies with time, so that the brightness difference of the cumulative brightness of the display screen in different EM cycles is within a difference range.
  • the terminal stores a light-emitting duty cycle curve, which is used to characterize the corresponding relationship between the light-emitting duty cycle and the EM period.
  • the DDIC chip makes adjustments based on the light-emitting duty cycle curve.
  • the luminous duty cycle curve is generated based on the brightness change curve of the display screen during the display process at a specific frequency without adjusting the luminous duty cycle.
  • the luminous duty cycle curve corresponding to 30Hz is generated based on the brightness change curve of the display screen during the display process at 30Hz without adjusting the luminous duty cycle;
  • the luminous duty cycle curve corresponding to 60Hz is generated based on the brightness change curve of the display screen during the display process at 60Hz without adjusting the luminous duty cycle.
  • the light emission duty cycle curve is generated based on a plurality of brightness change curves during the process of displaying different grayscale images on the display screen at a specific frequency.
  • the grayscale range is 0-255
  • the grayscale step is 10 (other step sizes can also be used)
  • multiple brightness change curves are obtained when the display screen displays different grayscale images at 30Hz, and multiple brightness change curves are calculated.
  • the target brightness change curve is fitted by fitting the target brightness change curve, and then a luminous duty cycle curve corresponding to 30Hz is generated based on the target brightness change curve.
  • the light-emitting duty cycle curve is fixed in the DDIC chip, and the DDIC chip directly reads and uses it, or the light-emitting duty cycle curve is stored in the memory of the terminal, and the DDIC chip can read and use it from the memory.
  • the light-emitting duty cycle curve supports updating.
  • the luminous duty cycle curve is used to indicate the luminous duty cycle of each EM cycle during the display of a single frame image.
  • the luminous duty cycle curve is used to indicate the luminous duty cycle of 6 EM cycles during the display of a single frame image; when the EM frequency is 360 Hz and the refresh rate is 30 Hz, the luminous duty cycle curve is used to indicate the luminous duty cycle of 12 EM cycles during the display of a single frame image.
  • the developer tests the screen brightness changes under different luminous duty cycles, obtains the luminous duty cycle corresponding to each EM cycle through multiple tests, and the luminous duty cycle can make the screen brightness as consistent as possible, and finally forms a luminous duty cycle curve, and stores the luminous duty cycle curve in the terminal.
  • the DDIC chip reads the stored luminous duty cycle curve, and then adjusts the luminous duty cycle of the EM cycle during the EM scanning process based on the luminous duty cycle curve.
  • the light-emitting duty cycles of different EM cycles indicated by the light-emitting duty cycle curve may be different from each other, or the light-emitting duty cycles of some EM cycles may be the same, while those of others may be different.
  • the light-emitting duty cycle curve indicates the light-emitting duty cycles of 12 EM cycles
  • the light-emitting duty cycles of the 12 EM cycles are different, or the light-emitting duty cycles of the odd-numbered EM cycles are the same
  • the light-emitting duty cycles of the even-numbered EM cycles are the same
  • the light-emitting duty cycles of the odd-numbered EM cycles are different from the light-emitting duty cycles of the even-numbered EM cycles.
  • the brightness change curve represents the decrease of brightness over time
  • the luminous duty cycle represented by the luminous duty cycle curve is positively correlated with the EM cycle.
  • the brightness change curve is used to represent the change of screen brightness over time.
  • the brightness change curve represents the case where the brightness decreases over time, that is, the screen brightness decreases as the EM cycle increases. At this time, it is necessary to appropriately increase the EM cycle's luminous duty cycle to compensate for the brightness. In addition, as the brightness decreases more and more seriously, the EM cycle's luminous duty cycle that needs to be increased should also be appropriately increased to compensate for more lost brightness.
  • Figure 1 is a schematic diagram of the relationship between screen brightness and time when the EM cycle luminous duty cycle is not adjusted. Among them, because the luminous duty cycle of each EM cycle is the same, the screen brightness gradually decreases with the occurrence of leakage. It can be seen that the brightness change curve represents the decrease in brightness over time.
  • FIG4 is a schematic diagram showing the relationship between screen brightness and time after the EM cycle luminous duty cycle is adjusted based on FIG1.
  • the luminous duty cycle of the EM cycle in FIG4 is significantly increased.
  • the luminous duty cycle when the EM cycle is not adjusted is 20%.
  • the duty cycle of the first cycle remains unchanged
  • the duty cycle of the second cycle is adjusted to 25%
  • the duty cycle of the third cycle is adjusted to 32%
  • the duty cycle of the fourth cycle is 42%.
  • the luminous duty cycle represented by the luminous duty cycle curve is negatively correlated with the EM period.
  • the screen leakage of low temperature polycrystalline oxide (LTPO) material is low, it can maintain the screen brightness very well. Therefore, the screen brightness increases with the increase of EM cycle, and the brightness change curve represents the increase of brightness over time. At this time, the screen brightness will also jump from high to low, which will cause the screen to flicker.
  • the EM cycle luminous duty cycle should be appropriately reduced. And as the EM cycle increases, the screen brightness increases more and more, and the reduction of the luminous duty cycle should gradually increase.
  • Figure 5 is a schematic diagram of the relationship between screen brightness and time before the EM periodic luminous duty cycle is adjusted when the refresh rate is 90Hz.
  • the horizontal axis represents time, and the vertical axis represents screen brightness. Due to the characteristics of the LTPO material, the screen brightness gradually increases due to EM scanning, and the brightness change curve represents the increase in brightness over time. When K+1 frames of images are displayed, there will be a brightness jump (brightness changes from high to low) due to brightness recovery.
  • FIG6 is a schematic diagram of the relationship between screen brightness and time after adjusting the EM cycle luminous duty cycle.
  • the luminous duty cycle in the EM cycle is significantly reduced. As the EM cycle increases, the luminous duty cycle continues to decrease, and the reduction amplitude gradually increases. For example, the luminous duty cycle when the EM cycle is not adjusted is 20%.
  • the luminous duty cycle of the first EM cycle remains unchanged, the luminous duty cycle of the second EM cycle is adjusted to 18%, the luminous duty cycle of the third EM cycle is adjusted to 14%, and the luminous duty cycle of the fourth EM cycle is 9%.
  • the luminous duty cycle curve represents that the luminous duty cycle in the first time interval is negatively correlated with the EM period, and the luminous duty cycle in the second time interval is positively correlated with the EM period.
  • first time interval and a second time interval in the light emission duty cycle curve, and the order of the first time interval and the second time interval is not limited.
  • the screen brightness shows a unidirectional change relationship with the EM cycle.
  • the screen brightness may change irregularly over time.
  • the screen brightness may increase in a certain period of time and decrease in another period of time.
  • the time period in which the continuous brightness change curve represents the brightness increasing over time can be set as the first time interval
  • the time period in which the continuous brightness change curve represents the brightness decreasing over time can be set as the second time interval.
  • the screen brightness decreases as the EM cycle increases.
  • the screen brightness increases as the EM cycle increases.
  • the EM cycle's luminous duty cycle should be appropriately reduced to avoid continuous increase in screen brightness.
  • both the first time interval and the second time interval may contain multiple EM cycles.
  • the relationship between the luminous duty cycle curve and the EM cycle is described below by taking the first time interval and the second time interval both containing 4 EM cycles as an example.
  • FIG7 is a schematic diagram of the relationship between screen brightness and time change before the EM cycle duty cycle is adjusted, when the brightness change curve represents the irregular relationship between brightness change over time.
  • the 1st to the 4th EM cycle is set as the first time interval, and the screen brightness increases over time in the first time interval, and the 5th to the 8th EM cycle is set as the second time interval, and the brightness decreases over time in the second time interval.
  • FIG8 is a schematic diagram of the relationship between screen brightness and time change after the EM cycle luminous duty cycle is adjusted, when the brightness change curve represents the irregular relationship between brightness change over time.
  • the screen brightness is controlled to remain unchanged by gradually reducing the luminous duty cycle, so the luminous duty cycle curve represents that the luminous duty cycle in the first time interval is negatively correlated with the EM cycle.
  • the luminous duty ratio of the EM cycle gradually increases.
  • the period length of the EM cycle remains unchanged, the luminous duty ratio gradually increases, that is, the luminous duty ratio in the second time interval is positively correlated with the EM cycle.
  • the DDIC chip can adopt corresponding strategies to adjust the luminous duty cycle of the EM period for different brightness change curves in actual applications, thereby improving the applicability of the DDIC chip.
  • Screen material and adjustment method are two inherent factors that affect the change of screen brightness and cannot be adjusted during the use of the screen.
  • the change of screen brightness may also be related to the real-time working status of the screen, such as screen brightness and screen refresh rate.
  • the DDIC chip determines a light-emitting duty cycle curve based on current display parameters, and different display parameters correspond to different light-emitting duty cycle curves, wherein the display parameters include at least one of a refresh rate and screen brightness.
  • FIG9 is a method flow chart of an image display method provided by another exemplary embodiment of the present application.
  • the method includes:
  • Step 901 determining a light-emitting duty cycle curve based on current display parameters.
  • Different display parameters correspond to different light-emitting duty cycle curves, and the display parameters include at least one of a refresh rate and screen brightness.
  • the number of refresh rates supported by the used screen is the number of luminous duty cycle curves.
  • a certain screen supports four screen refresh rates of 40Hz, 60Hz, 90Hz, and 120Hz. Four curves can be obtained by testing the four conditions respectively. Lighting duty cycle curve.
  • the number of configurable screen brightness levels is the number of luminous duty cycle curves.
  • the adjustable brightness levels of a certain screen can be divided into three types: 0nit-250nit, 250nit-350nit, and 350nit-500nit. By testing at these three brightness levels respectively, three luminous duty cycle curves can be obtained.
  • the total number of all possible combinations of the two parameters is the number of luminous duty cycle curves.
  • a certain screen supports four screen refresh rates of 40Hz, 60Hz, 90Hz, and 120Hz.
  • the adjustable brightness levels of this screen are divided into three types: 0nit-250nit, 250nit-350nit, and 350nit-500nit. At this time, there are 12 combinations that can be obtained by combining these two parameter types. Each combination method is tested, and each method can obtain a corresponding luminous duty cycle curve, a total of 12, as shown in Table 1.
  • the DDIC chip determines that the 5th luminous duty cycle curve is the luminous duty cycle curve under the current display parameter conditions. For another example, when the current screen brightness is 360nit and the refresh rate is 120Hz, based on the above two display parameters and in combination with the corresponding relationship in Table 1, the DDIC chip determines that the 12th luminous duty cycle curve is the luminous duty cycle curve under the current display parameter conditions.
  • Step 902 adjusting the light emission duty cycle of the EM cycle during the EM scanning process based on the light emission duty cycle curve.
  • the embodiment of the present application determines the luminous duty cycle curve based on the current display parameters.
  • the luminous duty cycle curve can also be determined based on other factors or a combination thereof, which is not limited in the embodiment of the present application.
  • the DDIC chip determines a luminous duty cycle curve suitable for the current display scene from a number of candidate luminous duty cycle curves based on real-time display parameters, and then adjusts the luminous duty cycle of the EM cycle based on the luminous duty cycle curve, which helps to improve the stability of the screen brightness in different display scenes and solve the problem of screen flickering in various display scenes.
  • refresh rate is an important factor affecting screen brightness.
  • the refresh rate when the refresh rate is low, there are more EM cycles in the single-frame image display process, the screen brightness attenuation is greater, and the brightness jump is more obvious.
  • the refresh rate when the refresh rate is high, the screen brightness attenuation is smaller, resulting in a larger screen brightness.
  • the screen flicker problem is not serious and may not be detected by the human eye in application scenarios.
  • the DDIC chip adjusts the luminous duty cycle of the EM cycle during the EM scanning process based on the current display parameters.
  • the DDIC chip may perform EM scanning according to the original light emission duty cycle.
  • the refresh rate threshold is set to 90 Hz.
  • the DDIC chip executes the light-emitting duty cycle adjustment method provided in any of the above embodiments.
  • the refresh rate threshold can also be set to other values, such as 60Hz, 120Hz, etc., and the embodiments of the present application are not limited to this.
  • DDIC determines whether it is necessary to adjust the luminous duty cycle of the EM cycle during the EM scanning process at the current refresh rate based on the refresh rate threshold.
  • the refresh rate is high, there will not be a large jump in the screen brightness. Therefore, the luminous duty cycle of the EM cycle may not be adjusted, thereby reducing power consumption.
  • the DDIC chip may adjust the light emission duty ratio of each EM cycle during the EM scanning process based on the current display parameters.
  • the method of adjusting the EM cycle light emission duty ratio shown in FIG4 is to adjust the light emission duty ratio of each EM cycle during the EM scanning process, which is suitable for the case of a low refresh rate to ensure that the screen brightness of each EM cycle is as consistent as possible.
  • the DDIC chip adjusts the luminous duty cycle of a specified EM cycle during the EM scanning process.
  • the DDIC adjusts the emission duty cycle of a specified EM cycle during the EM scan based on the target cycle interval.
  • the time interval between adjacent designated EM cycles is the target cycle interval.
  • the EM frequency is high and the EM cycles are dense, so a suitable target cycle interval can be preset.
  • the preset target interval is i.
  • the initial adjustment cycle is the ath cycle
  • the EM cycle duty cycle is adjusted once every EM cycle, that is, the luminous duty cycle of the 2nd cycle, the 4th cycle, the 6th cycle, and the 8th cycle is adjusted respectively, or the luminous duty cycle of the 1st cycle, the 3rd cycle, the 5th cycle, the 7th cycle, and the 9th cycle are adjusted respectively (not shown in the figure).
  • the EM cycle duty cycle is adjusted to the 9th cycle.
  • the brightness decay can be reduced and the screen flickering phenomenon can be alleviated.
  • any EM cycle can be selected as the start cycle of the adjustment.
  • the DDIC chip adjusts the specified EM cycle light emission duty cycle according to the target cycle interval, so that the embodiment can adjust the duty cycle of a specific EM cycle according to the brightness change corresponding to the actual brightness change curve. Due to the high EM frequency, when compensating the screen brightness, it is necessary to adjust the duty cycle of multiple EM cycles, which is costly. The method shown in this embodiment can effectively reduce the cost and power consumption.
  • the embodiment of the present application further provides a DDIC chip, wherein the DDIC chip is used for:
  • the luminous duty ratio of the EM cycle during the EM scanning process is adjusted based on the current display parameters.
  • the luminous duty ratio refers to the proportion of the luminous duration in the EM cycle.
  • the EM cycle includes a luminous phase and a closed phase. K is a positive integer.
  • the DDIC chip is used to:
  • a luminous duty cycle curve based on the current display parameter, wherein the luminous duty cycle curve is used to characterize the corresponding relationship between the luminous duty cycle and the EM period, and different display parameters correspond to different luminous duty cycle curves, wherein the display parameters include at least one of a refresh rate and a screen brightness;
  • the emission duty cycle of the EM cycle during the EM scanning process is adjusted based on the emission duty cycle curve.
  • the light-emitting duty cycle curve is generated based on a brightness change curve of the display screen during display at a specific frequency when the light-emitting duty cycle is not adjusted.
  • the light-emitting duty cycle represented by the light-emitting duty cycle curve is positively correlated with the EM period
  • the luminous duty cycle represented by the luminous duty cycle curve is negatively correlated with the EM period
  • the luminous duty cycle curve represents that the luminous duty cycle in the first time interval is negatively correlated with the EM period, and that the luminous duty cycle in the second time interval is positively correlated with the EM period.
  • the DDIC chip is used to:
  • the light emission duty cycle of a specified EM cycle during the EM scanning process is adjusted.
  • the DDIC chip is used to:
  • the light emission duty ratio of the designated EM cycle during the EM scanning process is adjusted, wherein a time interval between adjacent designated EM cycles is the target cycle interval.
  • the DDIC chip is further used for:
  • the light emission duty cycle of the EM cycle is adjusted to an initial value.
  • the DDIC chip is used to:
  • the light emission duty ratio of the EM cycle during the EM scanning process is adjusted based on the current display parameters.
  • the DDIC chip is used for a low-temperature polycrystalline silicon (LTPS) display, a low-temperature polycrystalline oxide (LTPO) display, or an oxide display.
  • LTPS low-temperature polycrystalline silicon
  • LTPO low-temperature polycrystalline oxide
  • the light emission duty ratio of the EM cycle during the EM scanning process varies with time, so that the brightness difference of the cumulative brightness of the display screen in different EM cycles is within a difference range.
  • an embodiment of the present application further provides a display screen module, which includes a display screen and a DDIC chip.
  • the DDIC chip is used to drive the display screen, and the DDIC chip is used to implement the image display methods provided by the above-mentioned various method embodiments.
  • FIG11 shows a block diagram of a terminal 1300 provided by an exemplary embodiment of the present application.
  • the terminal 1300 may be a smart phone, a tablet computer, a laptop computer, etc.
  • the terminal 1300 in the present application may include one or more of the following components: an AP 1310 , a display screen 1320 , and a DDIC chip 1330 .
  • AP1310 may include one or more processing cores. AP1310 uses various interfaces and lines to connect various parts in the entire terminal 1300, and executes various functions of the terminal 1300 and processes data by running or executing instructions, programs, code sets or instruction sets in the memory.
  • AP1310 can be implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA).
  • DSP digital signal processing
  • FPGA field-programmable gate array
  • PDA programmable logic array
  • AP1310 can integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), a neural-network processing unit (NPU), and a modem.
  • CPU central processing unit
  • GPU graphics processing unit
  • NPU neural-network processing unit
  • modem modem
  • the display screen 1320 may be a LTPS display screen, a LTPO display screen or an Oxide display screen.
  • the DDIC chip 1330 is used to drive the display screen 1320 to display images, and the DDIC chip 1330 is used to implement the image display methods provided in the above embodiments.
  • the DDIC chip 1330 is connected to the AP 1310 via the mobile industry processor interface MIPI interface to receive image data and instructions issued by the AP 1310.
  • the structure of the terminal 1300 shown in the above-mentioned figures does not constitute a limitation on the terminal 1300, and the terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.
  • the terminal 1300 also includes a microphone, a speaker, a radio frequency circuit, an input unit, a sensor, an audio circuit, a wireless fidelity (WiFi) module, a power supply, a Bluetooth module and other components, which will not be described in detail here.
  • WiFi wireless fidelity
  • Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another.
  • the storage medium can be any available medium that a general or special-purpose computer can access.

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Abstract

一种图像显示方法、DDIC芯片、显示屏模组及终端。显示方法用于显示屏的DDIC芯片，包括：在第K帧图像的显示过程中，基于当前显示参数调整发光扫描过程中EM周期的发光占空比，发光占空比指EM周期内发光时长的占比，EM周期包括发光阶段和关闭阶段，K为正整数(201)。

Description

图像显示方法、DDIC芯片、显示屏模组及终端
本申请要求于2022年11月03日提交的申请号为202211371016.4、发明名称为“图像显示方法、DDIC芯片、显示屏模组及终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及显示技术领域，特别涉及一种图像显示方法、显示驱动电路(Display Driver Integrated Circuit，DDIC)芯片、显示屏模组及终端。
背景技术
有源矩阵有机发光二极体(Active-Matrix Organic Light-Emitting Diode，AMOLED)作为一种应用自发光的显示屏技术，被广泛应用于智能手机、平板电脑、可穿戴式设备等终端中。
图像显示过程中，DDIC芯片控制显示屏中发光二极管进行周期性开关，即周期性控制发光二极管发光和熄灭，以保证显示屏处于持续亮屏状态。
发明内容
本申请实施例提供了一种图像显示方法、DDIC芯片、显示屏模组及终端。所述技术方案如下：
一方面，本申请实施例提供了一种图像显示方法，所述方法用于显示屏的显示驱动电路DDIC芯片，所述方法包括：
在第K帧图像的显示过程中，基于当前显示参数调整发光(Emission，EM)扫描过程中EM周期的发光占空比，所述发光占空比指所述EM周期内发光时长的占比，所述EM周期包括发光阶段和关闭阶段，K为正整数。
另一方面，本申请实施例提供了一种DDIC芯片，所述DDIC芯片应用于显示屏，所述DDIC芯片用于：
在第K帧图像的显示过程中，基于当前显示参数调整发光扫描过程中EM周期的发光占空比，所述发光占空比指所述EM周期内发光时长的占比，所述EM周期包括发光阶段和关闭阶段，K为正整数。
另一方面，本申请实施例提供了一种显示屏模组，所述显示屏模组包括显示屏和DDIC芯片，所述DDIC芯片用于驱动所述显示屏，所述DDIC芯片用于实现如上述方面所述的图像显示方法。
另一方面，本申请实施例提供了一种终端，所述终端包括应用处理器(Application Processor，AP)、显示屏和DDIC芯片，所述AP与所述DDIC芯片之间通过移动产业处理器接口(Mobile Industry Processor Interface，MIPI)相连，所述DDIC芯片用于实现如上述方面所述的图像显示方法。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是相关技术中不同刷新率下屏幕亮度与时间的变化关系示意图；
图2是本申请一个示例性实施例提供的图像显示方法的方法流程图；
图3是采用PWM技术调整EM周期发光占空比的示意图；
图4是本申请一个示例性实施例提供的调整EM周期发光占空比后，屏幕亮度与时间的变化关系的示意图；
图5是本申请一个示例性实施例提供的EM周期发光占空比调整前的屏幕亮度与时间的变化关系的示意图；
图6是本申请一个示例性实施例提供的EM周期发光占空比调整后的屏幕亮度与时间的变化关系的示意图；
图7是亮度变化曲线表征亮度与EM周期相关关系不规律的情况下，EM周期占空比调整前，屏幕亮度与时间变化关系的示意图；
图8是亮度变化曲线表征亮度与EM周期相关关系不规律的情况下，EM周期占空比调整后，屏幕亮度与时间变化关系的示意图；
图9是本申请另一示例性实施例提供的图像显示方法的方法流程图；
图10是调整EM扫描过程中指定EM周期的发光占空比时，屏幕亮度与时间变化关系的示意图；
图11是本申请一个示例性实施例提供的终端的结构方框图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
刷新率：显示屏每秒进行图像刷新的次数，单位为Hz。其中，画面显示流畅度与刷新率相关，且刷新率越高，画面显示流畅度越高。在一些实施例中，不同场景下显示屏的刷新率不同，以满足不同场景下的画面显示需求。比如，在静态文本阅读场景下，由于屏幕所显示的文本阅读界面的内容在短时间内并不会频繁变化，因此显示屏的刷新率被设置为10Hz；在视频播放场景下，屏幕中所显示的视频画面会在短时间内产生变化，且由于视频帧率通常低于60Hz，因此显示屏的刷新率被设置为60Hz；而在游戏场景下，由于游戏画面变化较快，且对画面显示的流畅度的要求较高，因此显示屏的刷新率被设置为120Hz。
发光(Emission，EM)周期：EM信号是一种面板行开关信号，用于控制当前行像素是否发光。开关信号的开关周期称为EM周期，每个EM周期内分为发光(Emission ON)和关闭(Emission OFF)两个阶段，其中，发光时长(即发光阶 段的持续时长)在一个EM周期内的占比称为发光占空比(Emission Duty)。
EM频率：EM频率即为产生EM信号的频率。通常情况下，EM频率为刷新率的整数倍，即在两次图像刷新期间进行多次EM开关，EM频率与刷新率的比值即为单次图像刷新对应的EM脉冲次数(EM-pulse-no)。比如，当刷新率为60Hz时，EM频率为240Hz或360Hz，对应的EM-pulse-no分别为4和6。
工作状态下，DDIC芯片控制图像刷新的同时，还需要发出EM信号控制显示屏发光，这样才能使显示屏显示出相应的图像。为了保证显示屏亮度，在相邻两次图像刷新之间，DDIC芯片需要控制显示屏进行多次发光。
然而，由于显示屏的材质和调校方式不同，因此不同显示屏的显示特性不同，相应的，不同显示屏在亮度保持方面的表现也存在较大差异。
例如，如果使用LTPS(Low Temperature Poly-silicon，低温多晶硅)材料作为显示屏的基板材料，由于LTPS有源层迁移率较大，因此基板漏电流较大，导致在完成一次图像扫描后，屏幕亮度衰减严重，而在下一次图像扫描时，因重新为当前行像素电路提供电压，所以屏幕亮度瞬间提升，最终出现屏幕闪烁现象。
以LTPS显示屏的EM频率为360Hz为例，如图1所示，其示出了不同刷新率下屏幕亮度与时间的变化关系，其中，横轴表示时间，纵轴表示屏幕亮度。
图1中左侧标注的数值是指刷新率，由于EM频率往往是刷新率的整数倍，所以在相邻两次图像刷新过程中存在多个EM周期。如图1所示，刷新率为90Hz时，EM频率为360Hz，所以在相邻两次图像刷新过程中应当存在4个EM周期。同理，当刷新率为40Hz时，相邻两次图像刷新过程中存在9个EM周期。
从图1中可以看出，由于LTPS显示屏漏电严重，因此完成一次图像刷新后，屏幕亮度随着时间延长不断衰减。当进行下一次图像刷新时，屏幕亮度突然升高会从视觉上带来闪烁感，影响用户的使用体验；并且，随着刷新率降低，屏幕亮度跃变幅度越大，闪烁感越明显。
为了缓解画面闪烁问题，本申请实施例中，通过DDIC芯片调整EM扫描过程中EM周期的发光占空比，补偿因漏电导致的屏幕亮度变化，避免图像刷新时出现屏幕亮度跃变的问题，以此缓解画面闪烁现象，提高显示屏的图像显示质量。
图2是本申请一个示例性实施例提供的图像显示方法的流程图，本实施例以该方法用于DDIC芯片为例进行说明，该方法包括：
步骤201，在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，发光占空比指EM周期内发光时长的占比，EM周期包括发光阶段和关闭阶段，K为正整数。
在一些实施例中，第K帧图像的图像帧数据可以是AP传输的一帧新的图 像帧数据，或者，该图像帧数据是DDIC芯片缓存的一帧历史图像帧数据(即DDIC芯片在未接收到新的图像帧数据的情况下，会基于历史图像帧数据进行重复刷新)。
在一些实施例中，在第K帧图像的完整显示过程中(包括图像扫描)，DDIC芯片基于当前显示参数调整EM扫描过程中EM周期的发光占空比。
在另一些实施例中，DDIC芯片基于第K帧图像的图像帧数据进行图像扫描过程中，按照初始发光占空比进行EM扫描；在完成图像扫描的情况下，DDIC芯片基于当前显示参数调整EM扫描过程中EM周期的发光占空比。这种情况下，在进行第K+1帧图像扫描之前，DDIC芯片将EM周期的发光占空比调整为初始值，从而在第K+1帧图像的图像扫描过程中，基于初始发光占空比进行EM扫描，并在完成第K+1帧图像扫描的情况下，调整EM扫描过程中EM周期的发光占空比。
在一种可能的实施方式中，DDIC芯片基于EM扫描过程中屏幕亮度的变化特性，调整EM扫描过程中EM周期的发光占空比。
其中，发光占空比指EM周期内发光时长的占比，EM周期包括发光阶段和关闭阶段。发光占空比的大小会对屏幕亮度造成影响，其中，发光占空比越高，发光时长越长，相应的，屏幕亮度越高；发光占空比越小，发光时长越短，屏幕亮度越低。
可选的，根据不同的屏幕亮度变化情况，DDIC芯片可以提高EM周期的发光占空比，也可以降低EM周期的发光占空比。由于人眼感知亮度是一个累积的过程，因此提高EM周期的发光占空比后，EM周期内显示屏的累积亮度提升，人眼感觉显示屏的亮度提升；相反的，降低EM周期的发光占空比后，EM周期内显示屏的累积亮度降低，人眼感觉显示屏的亮度降低。
关于调整EM周期的发光占空比的方式，在一种可能的实施方式中，DDIC芯片可以通过脉冲宽度调制(Pulse Width Modulation，PWM)技术对EM周期内发光占空比进行调节。本申请实施例并不对具体的调整方式进行限定。
图3是采用PWM技术调整EM周期发光占空比的示意图。如图3所示，当采用PWM方式进行发光占空比调整过程中，高电平表示发光阶段，低电平表示关闭阶段。PWM技术是采用方波进行调制的，通过调整高低电平的持续时长实现发光占空比的调整。t1至t5是两个EM周期持续的时间，第一个EM周期是从t1到t3，第二个周期是从t3到t5，两个EM周期的时长一致，即t3-t1＝t5-t3。其中，t1到t2为发光阶段，t2到t3为关闭阶段。发光占空比是发光时长占据EM周期时长的比例，图3中第1个EM周期发光时长为t2-t1，因此，第1个EM周期发光占空比为t2-t1/t3-t1，第2个EM周期的发光占空比为t4-t3/t5-t3。通过PWM调整发光占空比后，第二个EM周期高电平持续时间增加，进而使得第二个EM周期的发光占空比大于第一个EM周期的发光占空比，即t4-t3/t5-t3>t2-t1/t3-t1。
以LTPS显示屏的EM频率为360Hz为例，图4是在图1的基础上DDIC 芯片通过本申请实施例提供的方法调整EM周期发光占空比后，屏幕亮度与时间关系示意图，横轴表示时间，纵轴表示屏幕亮度。在图4中，由上至下刷新率分别为120Hz、90Hz、60Hz以及40Hz。其中，刷新率为120Hz时，DDIC芯片通过延长第2、第3个EM周期内的发光时长，提高了第2、第3个EM周期的发光占空比；刷新率为90Hz时，DDIC芯片通过延长第2、第3、第4个EM周期内的发光时长，提高了第2、第3、第4个EM周期的发光占空比；刷新率为60Hz时，DDIC芯片通过延长第2到第6个EM周期内的发光时长，提高了第2到第6个EM周期的发光占空比；刷新率为40时，DDIC芯片通过延长第2到第9个EM周期内的发光时长，提高了第2到第9个EM周期的发光占空比。
由于EM周期的发光占空比提高，因此，每个EM周期内的亮度提高，从而补偿因屏幕漏电导致的亮度降低，使EM扫描过程中屏幕亮度保持稳定，进而避免出现相邻图像帧显示过程之间的亮度跃变，能够降低用户对于相邻图像帧显示过程中亮度变化的感知。
需要说明的是，由于人眼感受到的屏幕闪烁是由于屏幕亮度变化造成的，因此，本申请实施例中，EM扫描过程中，EM周期的发光占空比随时间变化，以使得不同EM周期内的显示屏的累积亮度的亮度差在差值范围内。其中，该亮度差值范围是人眼无法感受到的亮度变化幅度，比如，显示屏显示255灰阶画面的过程中，人眼可察觉的亮度变化幅度为0.8％，即相邻EM周期的累积亮度的变化幅度在0.8％以内无法被人眼察觉，超过0.8％则能够被人眼察觉。
综上所述，本申请实施例中，DDIC芯片通过调整EM扫描过程中EM周期的发光占空比，实现对EM周期内发光时长的调整，提高了图像显示过程中屏幕亮度的稳定性，避免因屏幕亮度变化导致的闪烁现象，有助于提高显示屏的图像显示质量。
此外，未采用上述方案的情况下，为了避免屏幕过度闪烁，显示屏支持的最低刷新率通常较高；而采用上述EM周期调整机制后，显示屏在屏幕闪烁问题能够得到缓解，在低刷新率场景下尤为明显，因此显示屏能够支持更低的刷新率，一方面提升了显示屏的变频范围，另一方面有助于降低显示过程中的显示功耗。
可选的，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，包括：
基于当前显示参数确定发光占空比曲线，发光占空比曲线用于表征发光占空比与EM周期的对应关系，不同显示参数对应不同发光占空比曲线，显示参数包括刷新率和屏幕亮度中的至少一种；
基于发光占空比曲线调整EM扫描过程中EM周期的发光占空比。
可选的，发光占空比曲线基于未调整发光占空比情况下显示屏在特定频率下显示过程中的亮度变化曲线生成。
可选的，在亮度变化曲线表征亮度随时间降低的情况下，发光占空比曲线 表征的发光占空比与EM周期呈正相关关系；
在亮度变化曲线表征亮度随时间升高的情况下，发光占空比曲线表征的发光占空比与EM周期呈负相关关系；
在亮度变化曲线表征第一时间区间内亮度随时间升高，且第二时间区间内亮度随时间降低的情况下，发光占空比曲线表征第一时间区间内发光占空比与EM周期呈负相关关系，且第二时间区间内发光占空比与EM周期呈正相关关系。
可选的，调整EM扫描过程中指定EM周期的发光占空比，包括：
基于目标周期间隔，调整EM扫描过程中指定EM周期的发光占空比，其中，相邻的指定EM周期之间的时间间隔为目标周期间隔。
可选的，在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，包括：
在完成第K帧图像的图像扫描的情况下，基于当前显示参数调整EM扫描过程中EM周期的发光占空比；
方法还包括：
在进行第K+1帧图像的图像扫描之前，将EM周期的发光占空比调整为初始值。
可选的，在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，包括：
在当前刷新率小于刷新率阈值的情况下，在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比。
可选的，显示屏为低温多晶硅LTPS显示屏、低温多晶氧化物LTPO显示屏或氧化物Oxide显示屏。
可选的，EM扫描过程中EM周期的发光占空比随时间变化，以使不同EM周期内显示屏的累积亮度的亮度差在差值范围内。
在一种可能的实施方式中，终端存储有发光占空比曲线，该发光占空比曲线用于表征发光占空比与EM周期的对应关系。DDIC芯片在调整EM周期发光占空比时，基于该发光占空比曲线进行调整。
需要说明的是，发光占空比曲线是在未调整发光占空比的情况下，基于显示屏在特定频率下显示过程中的亮度变化曲线生成。
比如，30Hz对应的发光占空比曲线是基于未调整发光占空比情况下显示屏在30Hz下显示过程中的亮度变化曲线生成；60Hz对应的发光占空比曲线是基于未调整发光占空比情况下显示屏在60Hz下显示过程中的亮度变化曲线生成。
为了适应不同灰阶，在一些实施例中，该发光占空比曲线基于特定频率下显示屏显示不同灰阶图像过程中的多条亮度变化曲线生成。
例如灰阶范围为0-255，灰阶步长为10(也可以采用其他步长)，获取显示屏在30Hz下显示不同灰阶图像过程中的多条亮度变化曲线，并对多条亮度变 化曲线进行拟合得到目标亮度变化曲线，从而基于目标亮度变化曲线生成30Hz对应的发光占空比曲线。
可选的，该发光占空比曲线固设在DDIC芯片中，DDIC芯片直接读取使用，或者，该发光占空比曲线存储在终端的存储器中，DDIC芯片可以从该存储器中读取并使用。并且，该发光占空比曲线支持更新。
由于DDIC芯片是根据刷新率进行周期性图像刷新，因此，在一种可能的实施方式中，发光占空比曲线用于指示单帧图像显示过程中各个EM周期的发光占空比。
在一个示意性的例子中，当EM频率为360Hz，刷新率为60Hz时，该发光占空比曲线用于指示单帧图像显示过程中6个EM周期的发光占空比；当EM频率为360Hz，刷新率为30Hz时，该发光占空比曲线用于指示单帧图像显示过程中12个EM周期的发光占空比。
关于发光占空比曲线的生成方式，在一种可能的实施方式中，开发人员试验不同发光占空比下的屏幕亮度变化情况，通过多次试验得到每一个EM周期对应的发光占空比，该发光占空比能够使屏幕亮度尽可能保持一致，最终形成发光占空比曲线，并将该发光占空比曲线存储在终端中。工作状态下，DDIC芯片读取存储的发光占空比曲线，再基于发光占空比曲线，调整EM扫描过程中EM周期的发光占空比。
可选的，发光占空比曲线所指示不同EM周期的发光占空比可能各不相同，也有可能部分EM周期的发光占空比相同，部分不同。
比如，当发光占空比曲线指示12个EM周期的发光占空比时，12个EM周期的发光占空比各不相同，或者，奇数EM周期的发光占空比相同，偶数EM周期的发光占空比相同，且奇数EM周期的发光占空比与偶数EM周期的发光占空比不同。
由于不同显示屏的属性不同，所以对应的亮度变化曲线不同，相应的，对应的发光占空比曲线不同。下面对几种类型的发光占空比曲线进行说明。
发光占空比曲线表征的发光占空比与EM周期的相关性关系存在以下几种情况：
一、在亮度变化曲线表征亮度随时间降低的情况下，发光占空比曲线表征的发光占空比与EM周期呈正相关关系。其中，亮度变化曲线用于表征屏幕亮度随时间的变化情况。
亮度变化曲线表征亮度随时间降低的情况下，即屏幕亮度随着EM周期的增加而减弱，此时需要适当的增加EM周期的发光占空比，进行亮度补偿。此外，随着亮度降低越来越严重，需要增加的EM周期发光占空比也应适当的变大，以此来补偿更多损失的亮度。
以LTPS显示屏的EM频率为360Hz为例，图1是未调整EM周期发光占空比时的屏幕亮度与时间变化关系示意图，其中，因为每一个EM周期的发光占空比都相同，伴随着漏电情况的发生，屏幕亮度也逐渐减弱。可见亮度变化曲线表征亮度随时间降低。
图4是在图1的基础上，对EM周期发光占空比进行调整后的屏幕亮度与时间变化关系示意图。相较于图1，图4中EM周期的发光占空比明显增加，随着EM周期的增加，屏幕亮度减弱幅度越来越大，发光占空比的增加幅度也应越来越大。例如，未调整EM周期时的发光占空比为20％，在调整EM周期发光占空比后，第一个周期占空比保持不变，第二个周期占空比调整为25％，第三个周期占空比调整为32％，第四个周期发光占空比为42％，通过增加EM周期发光占空比，来避免屏幕亮度减弱造成的屏幕闪烁问题。可见，发光占空比曲线表征的发光占空比与EM周期呈正相关关系。
二、在亮度变化曲线表征亮度随时间升高的情况下，发光占空比曲线表征的发光占空比与EM周期呈负相关关系。
由于低温多晶氧化物(Low Temperature Polycrystalline Oxide，LTPO)材料的屏幕漏电量较低，能够很好的保持屏幕亮度，因此，屏幕亮度随EM周期的增加而增强，亮度变化曲线表征亮度随时间升高。此时，屏幕亮度也会产生由高到低的跃变，进而导致屏幕闪烁。这种情况下，在对EM周期发光占空比进行调整，应当适当减小EM周期的发光占空比。且随着EM周期的增加，屏幕亮度增加幅度越来越大，发光占空比的减小量应当逐渐增大。
以LTPO屏幕，EM频率360Hz为例，图5是刷新率为90Hz时的EM周期发光占空比调整前的屏幕亮度与时间变化关系示意图。横轴表示时间，纵轴表示屏幕亮度。由于LTPO材料的特性，屏幕亮度因EM扫描而逐渐增强，亮度变化曲线表征亮度随时间升高。当进行K+1帧图像显示时，会因为亮度恢复出现亮度跃变的情况(亮度由高变低)。
图6为调整EM周期发光占空比后的屏幕亮度与时间变化关系示意图。经过调整后，EM周期中的发光占空比明显减少，随着EM周期的增加，发光占空比不断减小，且减小幅度逐渐增大。例如，未调整EM周期时的发光占空比为20％，在调整EM周期发光占空比后，第一个EM周期的发光占空比保持不变，第二个EM周期的发光占空比调整为18％，第三个EM周期的发光占空比调整为14％，第四个EM周期的发光占空比为9％，通过减小EM周期的发光占空比，来避免屏幕亮度增加造成的屏幕闪烁。
三、在亮度变化曲线表征第一时间区间内亮度随时间升高，且第二时间区间内亮度随时间降低的情况下，发光占空比曲线表征第一时间区间内发光占空比与EM周期呈负相关关系，且第二时间区间内发光占空比与EM周期呈正相关关系。
其中，发光占空比曲线中存在至少一个第一时间区间和第二时间区间，并且第一时间区间和第二时间区间的先后不作限定。
上述两种情况中屏幕亮度与EM周期呈单向变化关系，但是由于屏幕材料或调校方式等因素，可能导致屏幕亮度随时间的关系变化不规律，可能存在屏幕在某一时段亮度升高，在另一时段亮度降低的现象。
因此，可以将连续的亮度变化曲线表征亮度随时间升高的时间段设定为第一时间区间，将连续的亮度变化曲线表征亮度随时间降低的时间段设定为第二 时间区间，第一时间区间内屏幕亮度随着EM周期的增加而减弱，此时需要适当的增加EM周期的发光占空比，进行亮度补偿。第二时间区间内，屏幕亮度随EM周期的增加而增强，应当适当减小EM周期的发光占空比，避免屏幕亮度持续增强。
其中，第一时间区间与第二时间区间内均可包含多个EM周期，下面以第一时间区间和第二时间区间均包含4个EM周期为例，说明发光占空比曲线与EM周期的关系。图7是亮度变化曲线表征亮度随时间变化关系不规律的情况下，EM周期占空比调整前，屏幕亮度与时间变化关系示意图。其中，将第1个至EM周期第4个EM周期设定为第一时间区间，第一时间区间内屏幕亮度随时间升高，将第五个EM周期至第8个EM周期设定为第二时间区间，第二时间区间内亮度随时间降低。图8为亮度变化曲线表征亮度随时间变化关系不规律的情况下，EM周期发光占空比调整后，屏幕亮度与时间变化关系示意图。调整EM周期发光占空比后，在第一时间区间内，通过逐渐减小发光占空比的方式控制屏幕亮度保持不变，因此发光占空比曲线表征第一时间区间内发光占空比与EM周期呈负相关关系。在第二时间区间内，EM周期的发光占空比逐渐增大在EM周期的周期长度不变的情况下，发光占空比逐渐增加，即第二时间区间内发光占空比与EM周期呈正相关关系。
本申请实施例中，提供了三种不同亮度曲线的情况下发光占空比与EM周期的相关性关系，DDIC芯片能够基于以上三种相关性关系，在实际应用中针对不同的亮度变化曲线采取相对应的策略调整EM周期的发光占空比，提高DDIC芯片的适用性。
屏幕材料和调校方式作为两种影响屏幕亮度变化的固有因素，在使用屏幕过程中不可调整。然而，屏幕亮度变化除了与这两种固有的因素有关外，可能还与屏幕实时工作状态有关，如，与屏幕亮度和屏幕刷新率等因素有关。进而，可能存在多种发光占空比曲线，因此，在基于发光占空比曲线，调整EM扫描过程中EM周期的发光占空比时，DDIC芯片应选取合适的发光占空比曲线作为调整依据。
在一种可能的实施方式中，DDIC芯片基于当前显示参数确定发光占空比曲线，不同显示参数对应不同发光占空比曲线，其中，显示参数包括刷新率和屏幕亮度中的至少一种。
图9是本申请另一示例性实施例提供的图像显示方法的方法流程图。该方法包括：
步骤901，基于当前显示参数确定发光占空比曲线。
其中，不同显示参数对应不同发光占空比曲线。显示参数包括刷新率和屏幕亮度中的至少一种。
在一种可能的实施方式中，在显示参数包括刷新率的情况下，所使用的屏幕支持的刷新率数量即为发光占空比曲线的数量。例如，某种屏幕支持40Hz、60Hz、90Hz、120Hz这四种屏幕刷新率，在四种情况下分别试验，可得到四条 发光占空比曲线。
在另一种可能的实施方式中，在显示参数包括屏幕亮度的情况下，可设置的屏幕亮度等级数量即为发光占空比曲线的数量。例如，某种屏幕可调节亮度等级可分为0nit-250nit、250nit-350nit、350nit-500nit三种，在这三种亮度下分别试验，可得到三条发光占空比曲线。
在另一种可能的实施方式中，在显示参数同时包括屏幕亮度和刷新率的情况下，对两种参数可能的所有情况进行排列组合后的总数即为发光占空比曲线的数量。例如，某种屏幕支持40Hz、60Hz、90Hz、120Hz这四种屏幕刷新率，这种屏幕可调节亮度等级分为0nit-250nit、250nit-350nit、350nit-500nit三种，此时对这两个参数种类进行排列组合后可得到的组合结果共12种，对每种组合方式进行试验，每一种方式均可得到对应的发光占空比曲线，共12条，如表1所示。
表1
示意性的，在当前屏幕亮度为270nit，刷新率为60Hz的情况下，基于这两种显示参数，结合表1的对应关系，DDIC芯片确定第5发光占空比曲线为当前显示参数条件下的发光占空比曲线。再例如，在当前屏幕亮度为360nit，刷新率为120Hz的情况下，基于以上两种显示参数，结合上述表1中的对应关系，DDIC芯片确定第12发光占空比曲线为当前显示参数条件下的发光占空比曲线。
步骤902，基于发光占空比曲线调整EM扫描过程中EM周期的发光占空比。
本申请实施例是基于当前显示参数确定发光占空比曲线，当然，也可以根据其他多种因素或其结合确定发光占空比曲线，本申请实施例中不做限定。
本实施例中，DDIC芯片基于实时的显示参数，从若干条候选发光占空比曲线中确定出适用于当前显示场景的发光占空比曲线，进而基于发光占空比曲线对EM周期的发光占空比进行调整，有助于提高不同显示场景屏幕亮度的稳定性，进而解决各种显示场景下屏幕闪烁的问题。
在实际应用中，刷新率是影响屏幕亮度的一个重要因素，如图1所示，刷新率较低时，单帧图像显示过程中EM周期较多，屏幕亮度衰减程度也越大，亮度跃变越明显。相应的，刷新率较高时，屏幕亮度衰减幅度较小，造成的屏 幕闪烁问题并不严重，在应用场景中可能不会被人眼捕捉到。
可见，刷新率低时，进行亮度补偿更具有必要性，本申请实施例具有更显著的效果。因此，在一种可能的实施方式中，在当前刷新率小于刷新率阈值的情况下，在第K帧图像的显示过程中，DDIC芯片基于当前显示参数调整EM扫描过程中EM周期的发光占空比。
可选的，在当前刷新率大于刷新率阈值的情况下，DDIC芯片可以按照原先的发光占空比进行EM扫描。
在一个示意性的例子中，刷新率阈值设置为90Hz，在刷新率小于90Hz的情况下，DDIC芯片执行上述任一实施例提供的发光占空比调整方式。
当然，该刷新率阈值还可以被设置为其他数值，比如60Hz，120Hz等等，本申请实施例并不对此构成限定。
本实施例中，DDIC根据刷新率阈值判断在当前刷新率时，判断是否需要调整EM扫描过程中EM周期的发光占空比，在刷新率较高的情况下，屏幕亮度不会存在较大的跃变，因此，可以不对EM周期的发光占空比进行调整，起到降低功耗的效果。
在一种可能的实施方式中，DDIC芯片可以基于当前显示参数调整EM扫描过程中各个EM周期的发光占空比。
图4中所示意的调整EM周期发光占空比的方式即为调整EM扫描过程中各个EM周期的发光占空比。适用于刷新率较低的情况，保证每一个EM周期的屏幕亮度尽可能保持一致。
然而，在EM频率较高的情况下，单帧图像显示过程中EM周期比较密集，如果对每个EM周期均进行调整，会存在很大的开销。因此，在另一种可能的实施方式中，DDIC芯片调整EM扫描过程中指定EM周期的发光占空比。
在一些实施例中，DDIC基于目标周期间隔，调整EM扫描过程中指定EM周期的发光占空比。
其中，相邻的指定EM周期之间的时间间隔为目标周期间隔。
EM频率较高，EM周期也比较密集，此时可以预设合适的目标周期间隔。在一个示意性的例子中，单帧图像显示过程中存在N个EM周期，预设目标间隔为i，在起始调整周期为第a周期的情况下，图像扫描过程中对第a周期、第a+i+1周期、第a+2(i+1)周期、…、第a+n(i+1)周期(n＝1，2，3…)的发光占空比进行调整，a+n(i+1)≤N。
如图10所示，以LTPS屏幕的EM频率为360Hz为例，假设刷新率为40Hz，则单帧图像显示过程中存在9个EM周期，为第1周期到第9周期，若将目标周期间隔设置为1，则每隔1个EM周期进行一次EM周期占空比调整，即分别对第2周期、第4周期、第6周期、第8周期进行发光占空比调整，或者分别对第1周期、第3周期、第5周期、第7周期以及第9周期进行发光占空比调整(图中未示出)，这样虽然部分EM周期仍存在屏幕亮度衰 落，但通过对目标周期间隔的合理预设，可使亮度衰落幅度较小，缓解屏幕闪烁的现象。
需要说明的是，DDIC芯片基于目标周期间隔对EM周期发光占空比进行调整时，可以选择任意一个EM周期作为调整的起始周期。
在本申请实施例中，DDIC芯片根据目标周期间隔，调整指定的EM周期发光占空比，使本实施例可以根据实际的亮度变化曲线对应的亮度变化情况，对特定的EM周期进行占空比调整，由于EM频率较高，在对屏幕亮度进行补偿时，需要对多个EM周期占空比调整，开销较大。采用本实施例示出的方法可有效减少开销，降低功耗。
需要说明的是，上述实施例中方案是以LTPO屏幕或LTPS屏幕为例进行说明，在其他可能的方式中，也可用于其他类型的自发光显示屏，比如氧化物(Oxide)显示屏，本申请实施例对此不做限定。
本申请实施例还提供了一种DDIC芯片，所述DDIC芯片用于：
在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，所述发光占空比指所述EM周期内发光时长的占比，所述EM周期包括发光阶段和关闭阶段，K为正整数。
在一些实施例中，所述DDIC芯片用于：
基于所述当前显示参数确定发光占空比曲线，所述发光占空比曲线用于表征发光占空比与EM周期的对应关系，不同显示参数对应不同发光占空比曲线，所述显示参数包括刷新率和屏幕亮度中的至少一种；
基于所述发光占空比曲线调整所述EM扫描过程中所述EM周期的所述发光占空比。
在一些实施例中，所述发光占空比曲线基于未调整发光占空比情况下所述显示屏在特定频率下显示过程中的亮度变化曲线生成。
在一些实施例中，在所述亮度变化曲线表征亮度随时间降低的情况下，所述发光占空比曲线表征的发光占空比与EM周期呈正相关关系；
在所述亮度变化曲线表征亮度随时间升高的情况下，所述发光占空比曲线表征的发光占空比与EM周期呈负相关关系；
在所述亮度变化曲线表征第一时间区间内亮度随时间升高，且第二时间区间内亮度随时间降低的情况下，所述发光占空比曲线表征所述第一时间区间内发光占空比与EM周期呈负相关关系，且所述第二时间区间内发光占空比与EM周期呈正相关关系。
在一些实施例中，所述DDIC芯片，用于：
调整所述EM扫描过程中各个所述EM周期的所述发光占空比；
或，
调整所述EM扫描过程中指定EM周期的所述发光占空比。
在一些实施例中，所述DDIC芯片，用于：
基于目标周期间隔，调整所述EM扫描过程中所述指定EM周期的所述发光占空比，其中，相邻的所述指定EM周期之间的时间间隔为所述目标周期间隔。
在一些实施例中，所述DDIC芯片，还用于：
在完成所述第K帧图像的图像扫描的情况下，基于所述当前显示参数调整所述EM扫描过程中所述EM周期的所述发光占空比；
在进行第K+1帧图像的图像扫描之前，将所述EM周期的发光占空比调整为初始值。
在一些实施例中，所述DDIC芯片，用于：
在当前刷新率小于刷新率阈值的情况下，在所述第K帧图像的显示过程中，基于所述当前显示参数调整所述EM扫描过程中所述EM周期的所述发光占空比。
在一些实施例中，所述DDIC芯片用于低温多晶硅LTPS显示屏、低温多晶氧化物LTPO显示屏或氧化物Oxide显示屏。
在一些实施例中，所述EM扫描过程中所述EM周期的发光占空比随时间变化，以使不同EM周期内所述显示屏的累积亮度的亮度差在差值范围内。
此外本申请实施例还提供了一种显示屏模组，该显示屏模组包括显示屏和DDIC芯片，DDIC芯片用于驱动所述显示屏，所述DDIC芯片用于实现上述各个方法实施例提供的图像显示方法。
图11示出了本申请一个示例性实施例提供的终端1300的结构方框图。该终端1300可以是智能手机、平板电脑、笔记本电脑等。本申请中的终端1300可包括一个或多个如下部件：AP1310、显示屏1320以及DDIC芯片1330。
AP1310可以包括一个或多个处理核心，AP1310利用各种接口和线路连接整个终端1300内的各个部分，通过运行或执行存储器内的指令、程序、代码集或指令集，执行终端1300的各种功能和处理数据。可选的，AP1310可以采用数字信号处理(Digital Signal Processing，DSP)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)、可编程逻辑阵列(Programmable Logic Array，PLA)中的至少一种硬件形式来实现。AP1310可集成中央处理器(Central Processing Unit，CPU)、图像处理器(Graphics Processing Unit，GPU)、神经网络处理器(Neural-network Processing Unit，NPU)和调制解调器等中的一种或几种的组合。
本申请实施例中，显示屏1320。其中，显示屏1320可以是LTPS显示屏、LTPO显示屏或Oxide显示屏。
DDIC芯片1330用于驱动显示屏1320进行图像显示，且DDIC芯片1330用于实现上述各个实施例提供的图像显示方法。此外，DDIC芯片1330与AP1310之间通过移动产业处理器接口MIPI接口相连，用于接收AP1310下发的图像数据以及指令。
除此之外，本领域技术人员可以理解，上述附图所示出的终端1300的结构并不构成对终端1300的限定，终端可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。比如，终端1300中还包括麦克风、扬声器、射频电路、输入单元、传感器、音频电路、无线保真(Wireless Fidelity，WiFi)模块、电源、蓝牙模块等部件，在此不再赘述。
应当理解的是，在本文中提及的“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。另外，本文中描述的步骤编号，仅示例性示出了步骤间的一种可能的执行先后顺序，在一些其它实施例中，上述步骤也可以不按照编号顺序来执行，如两个不同编号的步骤同时执行，或者两个不同编号的步骤按照与图示相反的顺序执行，本申请实施例对此不作限定。
本领域技术人员应该可以意识到，在上述一个或多个示例中，本申请实施例所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时，可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的任何可用介质。
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (22)

  1. 一种图像显示方法，所述方法用于显示屏的显示驱动电路DDIC芯片，所述方法包括：
    在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，所述发光占空比指所述EM周期内发光时长的占比，所述EM周期包括发光阶段和关闭阶段，K为正整数。
  2. 根据权利要求1所述的方法，其中，所述基于当前显示参数调整EM扫描过程中EM周期的发光占空比，包括：
    基于所述当前显示参数确定发光占空比曲线，所述发光占空比曲线用于表征发光占空比与EM周期的对应关系，不同显示参数对应不同发光占空比曲线，所述显示参数包括刷新率和屏幕亮度中的至少一种；
    基于所述发光占空比曲线调整所述EM扫描过程中所述EM周期的所述发光占空比。
  3. 根据权利要求2所述的方法，其中，所述发光占空比曲线基于未调整发光占空比情况下所述显示屏在特定频率下显示过程中的亮度变化曲线生成。
  4. 根据权利要求3所述的方法，其中，
    在所述亮度变化曲线表征亮度随时间降低的情况下，所述发光占空比曲线表征的发光占空比与EM周期呈正相关关系；
    在所述亮度变化曲线表征亮度随时间升高的情况下，所述发光占空比曲线表征的发光占空比与EM周期呈负相关关系；
    在所述亮度变化曲线表征第一时间区间内亮度随时间升高，且第二时间区间内亮度随时间降低的情况下，所述发光占空比曲线表征所述第一时间区间内发光占空比与EM周期呈负相关关系，且所述第二时间区间内发光占空比与EM周期呈正相关关系。
  5. 根据权利要求1所述的方法，其中，所述基于当前显示参数调整EM扫描过程中EM周期的发光占空比，包括：
    调整所述EM扫描过程中各个所述EM周期的所述发光占空比；
    或，
    调整所述EM扫描过程中指定EM周期的所述发光占空比。
  6. 根据权利要求5所述的方法，其中，所述调整所述EM扫描过程中指定EM周期的所述发光占空比，包括：
    基于目标周期间隔，调整所述EM扫描过程中所述指定EM周期的所述发光占空比，其中，相邻的所述指定EM周期之间的时间间隔为所述目标周期间 隔。
  7. 根据权利要求1至6任一所述的方法，其中，所述在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，包括：
    在完成所述第K帧图像的图像扫描的情况下，基于所述当前显示参数调整所述EM扫描过程中所述EM周期的所述发光占空比；
    所述方法还包括：
    在进行第K+1帧图像的图像扫描之前，将所述EM周期的发光占空比调整为初始值。
  8. 根据权利要求1至6任一所述的方法，其中，所述在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，包括：
    在当前刷新率小于刷新率阈值的情况下，在所述第K帧图像的显示过程中，基于所述当前显示参数调整所述EM扫描过程中所述EM周期的所述发光占空比。
  9. 根据权利要求1至6任一所述的方法，其中，所述显示屏为低温多晶硅LTPS显示屏、低温多晶氧化物LTPO显示屏或氧化物Oxide显示屏。
  10. 根据权利要求1至6任一所述的方法，其中，所述EM扫描过程中所述EM周期的发光占空比随时间变化，以使不同EM周期内所述显示屏的累积亮度的亮度差在差值范围内。
  11. 一种显示驱动电路DDIC芯片，所述DDIC芯片应用于显示屏，所述DDIC芯片用于：
    在第K帧图像的显示过程中，基于当前显示参数调整EM扫描过程中EM周期的发光占空比，所述发光占空比指所述EM周期内发光时长的占比，所述EM周期包括发光阶段和关闭阶段，K为正整数。
  12. 根据权利要求11所述的DDIC芯片，其中，所述DDIC芯片用于：
    基于所述当前显示参数确定发光占空比曲线，所述发光占空比曲线用于表征发光占空比与EM周期的对应关系，不同显示参数对应不同发光占空比曲线，所述显示参数包括刷新率和屏幕亮度中的至少一种；
    基于所述发光占空比曲线调整所述EM扫描过程中所述EM周期的所述发光占空比。
  13. 根据权利要求12所述的DDIC芯片，其中，所述发光占空比曲线基于未调整发光占空比情况下所述显示屏在特定频率下显示过程中的亮度变化曲线 生成。
  14. 根据权利要求13所述的DDIC芯片，其中，
    在所述亮度变化曲线表征亮度随时间降低的情况下，所述发光占空比曲线表征的发光占空比与EM周期呈正相关关系；
    在所述亮度变化曲线表征亮度随时间升高的情况下，所述发光占空比曲线表征的发光占空比与EM周期呈负相关关系；
    在所述亮度变化曲线表征第一时间区间内亮度随时间升高，且第二时间区间内亮度随时间降低的情况下，所述发光占空比曲线表征所述第一时间区间内发光占空比与EM周期呈负相关关系，且所述第二时间区间内发光占空比与EM周期呈正相关关系。
  15. 根据权利要求11所述的DDIC芯片，其中，所述DDIC芯片，用于：
    调整所述EM扫描过程中各个所述EM周期的所述发光占空比；
    或，
    调整所述EM扫描过程中指定EM周期的所述发光占空比。
  16. 根据权利要求15所述的DDIC芯片，其中，所述DDIC芯片，用于：
    基于目标周期间隔，调整所述EM扫描过程中所述指定EM周期的所述发光占空比，其中，相邻的所述指定EM周期之间的时间间隔为所述目标周期间隔。
  17. 根据权利要求11至16任一所述的DDIC芯片，其中，所述DDIC芯片，还用于：
    在完成所述第K帧图像的图像扫描的情况下，基于所述当前显示参数调整所述EM扫描过程中所述EM周期的所述发光占空比；
    在进行第K+1帧图像的图像扫描之前，将所述EM周期的发光占空比调整为初始值。
  18. 根据权利要求11至16任一所述的DDIC芯片，其中，所述DDIC芯片，用于：
    在当前刷新率小于刷新率阈值的情况下，在所述第K帧图像的显示过程中，基于所述当前显示参数调整所述EM扫描过程中所述EM周期的所述发光占空比。
  19. 根据权利要求11至16任一所述的DDIC芯片，其中，所述DDIC芯片用于低温多晶硅LTPS显示屏、低温多晶氧化物LTPO显示屏或氧化物Oxide显示屏。
  20. 根据权利要求11至16任一所述的DDIC芯片，其中，所述EM扫描 过程中所述EM周期的发光占空比随时间变化，以使不同EM周期内所述显示屏的累积亮度的亮度差在差值范围内。
  21. 一种显示屏模组，所述显示屏模组包括显示屏和显示驱动电路DDIC芯片，所述DDIC芯片用于驱动所述显示屏，所述DDIC芯片用于实现如权利要求1至10任一所述的图像显示方法。
  22. 一种终端，所述终端包括应用处理器AP、显示屏和显示驱动电路DDIC芯片，所述AP与所述DDIC芯片之间通过移动产业处理器接口MIPI相连，所述DDIC芯片用于实现如权利要求1至10任一所述的图像显示方法。
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