CN117854435A

CN117854435A - Display control method, display control device, terminal device, and storage medium

Info

Publication number: CN117854435A
Application number: CN202410190187.XA
Authority: CN
Inventors: 马道之; 侯帅; 吴国强
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2024-02-20
Filing date: 2024-02-20
Publication date: 2024-04-09

Abstract

The present disclosure provides a display control method, a display control device, a terminal device, and a storage medium, where the display control method includes: before refreshing the next frame of picture, acquiring the next frame of picture data of the display panel; determining the expected load corresponding to the next frame of picture based on the next frame of picture data; when the expected load is less than or equal to a first threshold, selecting one of N switching power supply modulation modes, wherein N is greater than 1, and at least one of the output voltage ripple frequency and ripple amplitude of different switching power supply modulation modes is different; and driving the display panel to refresh and display the next frame of picture based on the currently selected switching power supply modulation mode. The display control method, the display control device, the terminal equipment and the storage medium provided by the embodiment of the disclosure can improve the picture display quality.

Description

Display control method, display control device, terminal device, and storage medium

Technical Field

The present invention relates to the field of image display technologies, and in particular, to a display control method, a display control device, a terminal device, and a storage medium.

Background

The organic light emitting diode (Organic Light Emitting Diode, OLED) display panel has the characteristics of self-luminescence, wide viewing angle, high contrast ratio, high corresponding speed, low power consumption, ultra-light weight and the like, and is widely applied in industry. However, the OLED display panel may have water ripple phenomenon under low brightness and low gray scale display screen, which affects the quality of the product.

Disclosure of Invention

The embodiment of the disclosure provides a display control method, a display control device, a terminal device and a storage medium, which can improve the picture display quality.

The technical scheme provided by the embodiment of the disclosure is as follows:

in a first aspect, an embodiment of the present disclosure provides a display control method applied to a display panel; the method comprises the following steps:

before refreshing the next frame of picture, acquiring the next frame of picture data of the display panel;

determining the expected load corresponding to the next frame of picture based on the next frame of picture data;

when the expected load is less than or equal to a first threshold, selecting one of N switching power supply modulation modes, wherein N is greater than 1, and at least one of the output voltage ripple frequency and ripple amplitude of different switching power supply modulation modes is different;

And driving the display panel to refresh and display the next frame of picture based on the currently selected switching power supply modulation mode.

Illustratively, the method further comprises:

selecting a first switching power supply modulation mode of the N switching power supply modulation modes when the expected load is greater than or equal to a third threshold;

selecting a second switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a third threshold value and greater than or equal to the second threshold value;

wherein,

the third threshold is greater than the second threshold;

the second threshold is greater than the first threshold;

the output voltage ripple frequency of the first switching power supply modulation mode is greater than the output voltage ripple frequency of the second switching power supply modulation mode;

the output voltage ripple amplitude of the first switching power supply modulation mode is smaller than the output voltage ripple amplitude of the second switching power supply modulation mode.

Illustratively, when the expected load is less than or equal to a first threshold, selecting one of N switching power supply modulation modes specifically includes:

and selecting the first switching power supply modulation mode or the second switching power supply modulation mode of N switching power supply modulation modes when the expected load is smaller than or equal to a first threshold value.

selecting a third switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a first threshold;

wherein,

the output voltage ripple frequency of the third switching power supply modulation mode is smaller than the output voltage ripple frequency of the second switching power supply modulation mode; the output voltage ripple amplitude of the third switching power supply modulation mode is larger than that of the second switching power supply modulation mode; and is also provided with

The output voltage ripple frequency of the third switching power supply modulation mode is larger than a preset frequency value, and the output voltage ripple amplitude is smaller than a preset amplitude.

The first switching power supply modulation mode of the N switching power supply modulation modes is a pulse width modulation mode, the second switching power supply modulation mode is a pulse frequency modulation mode, and the third switching power supply modulation mode is a pulse cross-period modulation mode.

Illustratively, the expected load includes at least one of luminance data of the frame refresh picture and an image refresh frequency.

In a second aspect, embodiments of the present disclosure provide a display control apparatus applied to a display panel; the display control device includes:

the acquisition unit is used for acquiring the next frame picture data of the display panel before refreshing the next frame picture;

a determining unit, configured to determine an expected load corresponding to the next frame based on the next frame data;

a first selecting unit, configured to select one of N switching power supply modulation modes when the expected load is less than or equal to a first threshold, where N is greater than 1, and at least one of output voltage ripple frequencies and ripple magnitudes of different switching power supply modulation modes are different;

and the switching power supply control unit is used for driving the display panel to refresh and display the next frame of picture based on the currently selected switching power supply modulation mode.

Illustratively, the display control apparatus further includes:

a second selecting unit configured to select a first switching power supply modulation mode of N switching power supply modulation modes when the expected load is greater than or equal to a third threshold;

a third selecting unit configured to select a second switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a third threshold value and greater than or equal to the second threshold value;

Wherein,

the third threshold is greater than the second threshold;

the second threshold is greater than the first threshold;

The first selection unit is, for example, specifically configured to:

selecting the first switching power supply modulation mode or the second switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a first threshold;

or,

selecting a third switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a first threshold; wherein,

the output voltage ripple frequency of the third switching power supply modulation mode is smaller than that of the second switching power supply modulation mode, and the output voltage ripple amplitude of the third switching power supply modulation mode is larger than that of the second switching power supply modulation mode; and is also provided with

Illustratively, the acquiring unit, the determining unit, and the first selecting unit are all integrated on a display driving integrated circuit; the switching power supply control unit is integrated on a power supply management integrated circuit.

In a third aspect, an embodiment of the present disclosure provides a terminal device, including:

a processor;

a memory for storing a computer program executable by the processor;

the processor is configured to execute the computer program in the memory to implement the steps of the method as described above.

In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium having stored thereon an executable computer program which, when executed, implements the steps of the method as described above.

The beneficial effects brought by the embodiment of the disclosure are as follows:

in the above scheme, before refreshing the next frame of picture of the display panel, the next frame of picture data is acquired, and the next frame of picture data is parsed to determine the expected load of the next frame of picture, the expected load is compared with the preset first threshold, when the expected load is smaller than or equal to the first threshold, one of the N switching power supply modulation modes is selected, and based on the selected switching power supply modulation mode, the display panel is driven to refresh and display the next frame of picture. In this way, when the load data of the next frame of picture is lower than the first threshold, in other words, the load of the display panel of the next frame of picture can be judged to be low, so that when the next frame of picture is refreshed, one of the N switch power supply modulation modes is switched, the display panel is driven to refresh and display the next frame of picture, and compared with the switch power supply modulation mode in the related art that the switch power supply modulation mode is automatically switched to the switch power supply modulation mode with low voltage ripple frequency and high voltage ripple amplitude under the low load, the switch power supply modulation mode under the low load can be more flexibly set, thereby reducing the water ripple phenomenon under the low load of the module.

Drawings

Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the disclosure;

fig. 2 is a schematic diagram of a pixel driving circuit according to an embodiment of the disclosure;

FIG. 3 is a schematic diagram of a pixel driving timing diagram according to an embodiment of the disclosure;

FIG. 4 shows one of the flowcharts of the display control method provided by the embodiments of the present disclosure;

FIG. 5 is a second flowchart of a display control method according to an embodiment of the disclosure;

fig. 6 is a block diagram showing a structure of a display control apparatus according to an embodiment of the present disclosure;

FIG. 7 illustrates an I2C register setting table in a PMIC provided by embodiments of the present disclosure;

fig. 8 is a timing diagram of a switching power supply modulation mode in a DDIC control PMIC according to an embodiment of the present disclosure.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

As shown in fig. 1, the display panel 10 includes a display area AA and a non-display area DA disposed at least one side of the display area AA. The non-display area DA is exemplarily shown in fig. 1 as being disposed around the display area AA, and in other embodiments, the non-display area DA may be disposed on one side, adjacent two sides, opposite two sides, or any other combination of sides of the display area AA, which is not limited herein.

For example, the display area AA may include pixel areas arranged in an array, and each pixel area may have pixels and a pixel driving circuit for supplying driving signals to the pixels. The pixels are controlled by the pixel driving circuit to emit light, and the pixels arranged in an array cooperate to realize the display of a target display picture.

For example, the structure of the pixel driving circuit may be as shown in fig. 2, and the corresponding pixel driving timing may be as shown in fig. 3. Wherein M1-M7 are all crystal switches (e.g., thin film transistors); scanN1, scanN2 and ScanP are scanning signals, and are used for turning on corresponding transistor switches at different stages in a scanning time sequence so as to realize transmission of corresponding signals; emit is a light emission control signal, data is a data signal, PVDD is a first power supply signal, PVEE is a second power supply signal, vref1 is a first reference power supply signal, and Vref2 is a second reference power supply signal.

With reference to fig. 2 and 3, the crystal switches M1 to M7 may be low-level on switches; when ScanN1 is at a low level, corresponding to an initialization stage; when ScanN2 is at a low level, the corresponding data writing stage comprises a ScanP low level, and the anode of the OLED is initialized by using a second reference power supply signal Vref2 so as to avoid the influence of the last frame on the display of the current frame; when Emit is at a low level, the OLED emits light in a corresponding light emitting stage, so that the OLED light emission control is realized.

It should be noted that M1-M7 may be specifically selected as a high-level on switch (e.g., an N-type transistor) or a part of a high-level on switch and a part of a low-level on switch (e.g., a P-type transistor) according to design requirements, which is not limited in this application.

The scan signal, the light emission control signal, the power signal, and the like are provided based on corresponding signal lines, which may extend from the non-display area DA to the display area AA and are connected to corresponding pixel driving circuits.

The driving circuit of the display Panel (Panel) mainly includes a display driving integrated circuit (Display Driver Integrated Circuit, abbreviated as DDIC) and a power management integrated circuit (Power Management Integrated Circuit, abbreviated as PMIC), wherein the DDIC provides digital and analog signals such as scan signals, light emission control signals, etc., is responsible for driving a thin film transistor (Thin Film Transistor, abbreviated as TFT) within the display Panel, and writes a Data voltage (Source Data); the PMIC provides dc power supply signals ELVDD (positive) and ELVSS (negative), which are responsible for driving the light emitting material in the display substrate to emit light.

In the related art, an OLED display panel of a display device may display with image refresh frequencies set differently in different application scenarios. There are three kinds of control logic of the switching power supply in the PMIC, namely, PWM (pulse width modulation) mode, PFM (pulse frequency modulation) mode and PSM (pulse cross period modulation) mode.

The PWM mode has the highest frequency, and the PMIC switching frequency is the highest, so that the output ripple amplitude value is the smallest, but the power consumption loss of the switching power supply is larger, and the conversion efficiency is lower in low load; the frequency of the PFM mode is adjustable, and the corresponding output ripple is moderate; the switching power supply in the PSM mode has the lowest frequency, the lowest power consumption loss of the switching power supply and the highest conversion efficiency in low load, however, the voltage on the power supply signal line fluctuates, so that the brightness of a display picture is different, water ripple is formed, and the display effect is affected.

In an application scene of displaying a static picture such as an electronic book, the OLED display panel adopts a low-frequency PSM mode, and in the mode, the OLED display panel adopts a lower image refreshing frequency so as to reduce the power consumption of the OLED display panel. However, when the OLED display panel is in a light load (e.g., 2nitL 32) screen in the low frequency mode, the PMIC automatically enters the PSM mode, and ripples/fluctuations are generated on the PVEE, and the fluctuations in voltage cause a brightness difference in the frame brightness, so as to form water ripples.

In order to solve the above problems, embodiments of the present disclosure provide a display control method, a display control device, a terminal device, and a storage medium, which can reduce the occurrence of moire phenomenon and improve the display quality of a picture.

The display control method provided by the embodiment of the disclosure is applied to a display panel.

As shown in fig. 5, the method comprises the steps of:

step S01, acquiring next frame picture data of the display panel before refreshing the next frame picture;

step S02, determining the expected load corresponding to the next frame of picture based on the next frame of picture data;

step S03, when the expected load is smaller than or equal to a first threshold value, selecting one of N switching power supply modulation modes, wherein N is larger than 1, and at least one of the output voltage ripple frequency and ripple amplitude of different switching power supply modulation modes is different;

and step S04, driving the display panel to refresh and display the next frame of picture based on the currently selected switching power supply modulation mode.

It should be noted that, the switching power supply is a power supply that maintains a stable output voltage by controlling a time ratio (and a duty ratio) of switching on and off of the switching transistor by using a modern power electronic technology. The switching power supply may include a direct current-direct current (DC-DC) switching power supply, an alternating current-direct current (AC-DC) switching power supply.

For a switching power supply, if it is desired to maintain an output voltage unchanged in the event of a load change, there is generally a feedback system for monitoring the output voltage and controlling a time ratio of turning on and off switching transistors in the switching power supply in a control manner such as Pulse-Width Modulation (PWM), pulse frequency Modulation (PFM, pulse Frequency Modulation) according to the monitored output voltage, thereby maintaining an output voltage value of the switching power supply unchanged.

Taking a PWM control manner as an example, in a case where the modulation period is constant, if it is monitored that the output voltage of the switching power supply becomes low, meaning that the load becomes heavy, the duty ratio of the pulse modulation signal may be increased, that is, the output voltage value of the switching power supply may be maintained unchanged by increasing the time proportion of switching on in the switching power supply; if the output voltage of the switching power supply becomes high, meaning that the load becomes light, the duty ratio of the pulse modulation signal can be reduced, that is, the output voltage value of the switching power supply can be maintained unchanged by reducing the proportion of time that the switch is on.

Taking a PFM control mode as an example, if the output voltage of the switching power supply is monitored to be low under the condition that the switching on duration is fixed, which means that the load becomes heavy, the switching on times of the switch can be increased through the pulse modulation signal, namely the frequency of the pulse modulation signal becomes high; if it is detected that the output voltage of the switching power supply becomes high, meaning that the load becomes light, the number of times the switch is turned on can be reduced by the pulse modulation signal, that is, the frequency of the pulse modulation signal becomes low.

In an embodiment of the present disclosure, a terminal device may include a display panel, a Power Management Integrated Circuit (PMIC), and a Display Driving Integrated Circuit (DDIC). Wherein, the PMIC provides direct current power supply signals ELVDD (positive) and ELVSS (negative), which are responsible for driving the light emitting material in the display substrate to emit light.

There may be N switching power supply modulation modes in the PMIC, for example: the first switching power supply modulation mode and the second switching power supply modulation mode. The output voltage ripple frequency of the first switching power supply modulation mode is greater than the output voltage ripple frequency of the second switching power supply modulation mode; the output voltage ripple amplitude of the first switching power supply modulation mode is smaller than the output voltage ripple amplitude of the second switching power supply modulation mode.

Illustratively, the first switching power supply modulation mode is a PWM mode; the second switching power supply modulation mode is a PFM mode.

As shown in fig. 6, the step S03 further includes the following steps:

wherein,

the third threshold is greater than the second threshold;

the second threshold is greater than the first threshold;

In the above scheme, the switching frequency of the first switching power supply modulation mode is highest, the output ripple amplitude is smallest, but the switching power supply has larger power consumption loss and lower conversion efficiency under low load. Therefore, when the expected load is greater than or equal to a third threshold, the first switching power supply modulation mode can be automatically selected to drive the next frame of picture to be displayed. In other words, when the third threshold is greater than the second threshold and the first threshold and the next frame of picture is greater than the first threshold (i.e. high load), the high-frequency modulation mode of the first switching power supply may be selected, and in this mode, the display panel may display with a higher image refresh frequency, so as to ensure smoothness of the display picture. For example, in an application scene of a game, a video, or the like displaying a dynamic picture, the OLED display panel adopts a PWM mode of a high frequency.

The switching frequency of the second switching power supply modulation mode is lower than that of the first switching power supply modulation mode, but the switching frequency is higher than or equal to a second threshold value and is obviously higher than a third threshold value, in other words, the switching frequency of the second switching power supply modulation mode is moderate, so when the next frame of picture is higher than the second threshold value and smaller than the first threshold value (medium load), the second switching power supply modulation mode with medium frequency can be selected, and in the mode, the display panel can display by adopting moderate image refreshing frequency and output ripple is not obvious.

Illustratively, in the step S03, when the expected load is less than or equal to the first threshold, one of the N switching power supply modulation modes is selected, which specifically includes:

That is, when the low load of the next frame is determined before the next frame is refreshed, the first switching power supply modulation mode or the second switching power supply modulation mode with higher frequency can be selected, so that compared with the low frequency PSM mode selected in the related art, the refresh frame can be dynamically recognized, the switching power supply modulation mode can be dynamically set and adjusted, and compared with the switching power supply modulation mode with the low load in the related art, the switching power supply modulation mode is automatically switched to the low voltage ripple frequency and the high voltage ripple amplitude, the phenomenon of water ripple of the frame under the low load of the module is reduced.

In the step S03, when the expected load is less than or equal to the first threshold, one of the N switching power supply modulation modes is selected, which may be one of the N switching power supply modulation modes automatically selected according to a preset control policy; or selecting a corresponding switching power supply modulation mode according to the user interaction condition.

Exemplary switching power supply modulation modes in the PMIC are three modes of PWM (pulse width modulation) mode, PFM (pulse frequency modulation) mode, and PSM (pulse cross period modulation) mode. In the above embodiment, the first switching power supply modulation mode may be a PWM mode; the second switching power supply modulation mode may be a PFM mode.

Therefore, the load of the next frame of picture can be dynamically identified under the condition that the original switching power supply modulation mode of the PMIC is not changed, and when the next frame of picture is determined to be low load lower than a third threshold value, the original mode of automatically selecting the low-frequency PFM mode is changed, and the high-frequency PWM mode or the middle-frequency PFM mode is automatically selected.

In another exemplary embodiment, in step S03, when the expected load is less than or equal to the first threshold, one of N switching power supply modulation modes is selected, and the method specifically includes: selecting a third switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a first threshold; the output voltage ripple frequency of the third switching power supply modulation mode is smaller than that of the second switching power supply modulation mode; the output voltage ripple amplitude of the third switching power supply modulation mode is larger than that of the second switching power supply modulation mode; and the output voltage ripple frequency of the third switching power supply modulation mode is larger than a preset frequency value, and the output voltage ripple amplitude is smaller than a preset amplitude.

In the above scheme, the third switching power supply modulation mode may be a PSM mode, but in the PSM mode, an output voltage ripple frequency of the third switching power supply modulation mode is greater than a preset frequency value, and an output voltage ripple amplitude is less than a preset amplitude. Here, the preset frequency value and the preset amplitude may be understood as an output voltage ripple frequency and an output voltage ripple amplitude corresponding to the PSM mode under the low load before the improvement. In other words, in the above embodiment, the PSM mode may still be selected when the refresh frame is dynamically identified and the next frame is determined to be low-load, but the PSM mode is an improved PSM mode, where the output voltage ripple frequency increases and the output voltage ripple amplitude decreases.

In this way, by increasing the output voltage ripple frequency and reducing the output voltage ripple amplitude in the PSM mode, even if the next frame is determined to be low-load by dynamically identifying the refresh frame, the improved PSM mode is automatically selected, which can also achieve the purpose of improving the water ripple phenomenon.

Further, it should be noted that in some exemplary embodiments, the expected load includes at least one of luminance data of a frame refresh picture and an image refresh frequency. The luminance data may include a luminance value, a gray-scale value, and the like. The expected load may be characterized based on at least one of luminance data of the frame refresh picture and an image refresh frequency.

Referring to fig. 6, an embodiment of the present disclosure provides a display control apparatus applied to a display panel 10, the display control apparatus including:

an acquiring unit 110, configured to acquire next frame picture data before refreshing the next frame picture;

a determining unit 120, configured to determine an expected load corresponding to the next frame based on the next frame data;

a first selecting unit 410, configured to select one of N switching power supply modulation modes when the expected load is less than or equal to a first threshold, where N is greater than 1, and at least one of the output voltage ripple frequency and the ripple amplitude of different switching power supply modulation modes is different;

the switching power supply control unit 440 is configured to drive the display panel to refresh and display a next frame of picture based on the currently selected one of the switching power supply modulation modes.

In the above scheme, before the next frame of the display panel 10 is refreshed, the next frame of the display panel is acquired and parsed to determine the expected load of the next frame of the display panel, the expected load is compared with the preset first threshold, and when the expected load is less than or equal to the first threshold, one of the N switching power supply modulation modes is selected, and the display panel is driven to refresh and display the next frame of the display panel based on the selected switching power supply modulation mode. In this way, when the load data of the next frame of picture is lower than the first threshold, in other words, the load of the display panel of the next frame of picture can be judged to be low, so that when the next frame of picture is refreshed, one of the N switch power supply modulation modes is switched, the display panel is driven to refresh and display the next frame of picture, and compared with the switch power supply modulation mode in the related art that the switch power supply modulation mode is automatically switched to the switch power supply modulation mode with low voltage ripple frequency and high voltage ripple amplitude under the low load, the switch power supply modulation mode under the low load can be more flexibly set, thereby reducing the water ripple phenomenon under the low load of the module.

Illustratively, as shown in fig. 6, the display control apparatus further includes:

a second selecting unit 420, configured to select a first switching power supply modulation mode of the N switching power supply modulation modes when the expected load is greater than or equal to a third threshold;

a third selecting unit 430, configured to select a second switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a third threshold value and greater than or equal to the second threshold value;

wherein,

the third threshold is greater than the second threshold;

the second threshold is greater than the first threshold;

Illustratively, the first selecting unit 410 is specifically configured to:

In another exemplary embodiment, the first selection unit 410 is specifically configured to:

Illustratively, as shown in fig. 6, the DDIC 20 receives display Data (Data) sent by a processor of the terminal device (AP) 30, decompresses the display Data, converts the decompressed display Data into a Data voltage signal output by a Source signal (Source), and transmits the Data voltage signal to a pixel driving circuit of the display panel 10, where the pixel driving circuit can excite the light emitting device to emit different brightness under different Data voltage signal conditions, so as to realize display of various brightness and color.

Illustratively, the acquisition unit 110, the determination unit 120 may be integrated on a Display Driver Integrated Circuit (DDIC) 20; the first selection unit 410, the second selection unit 420, the third selection unit 430, and the switching power supply control unit 440 are integrated on a Power Management Integrated Circuit (PMIC) 40.

Illustratively, the acquisition unit 110 includes:

a memory (Sram) for storing display data from a terminal device processor and a pre-stored first threshold value, wherein the display data includes next frame picture data, and the first threshold value may be a load range value of a water ripple picture acquired in a code debugging in a previous stage;

the analyzer is used for analyzing the display data stored in the memory so as to determine the expected load of the next frame of picture before refreshing the next frame of picture;

and the comparator is used for comparing the expected load with the first threshold value and generating a comparison result.

With the above-described scheme, please refer to fig. 6, in which the DDIC stores the display data received from the processor of the terminal device in the internal memory in advance before refreshing the screen, at which time the DDIC can calculate the internal data of the memory, the luminance data and the image refresh rate of the next frame of picture may be determined before the display panel refreshes the frame, and in the code debugging of the previous stage, the load range in which the moire picture is determined to occur may be recorded as the first threshold value and stored in the memory in advance. The comparator compares the expected load with the first threshold value, generates a comparison result, and transmits an instruction to the PMIC, and the first selection unit 410, the second selection unit 420, and the third selection unit 430 select one switching power supply modulation mode in the PMIC based on the comparison result.

Illustratively, control instructions are transferred between the DDIC and PMIC by setting an I2C interface. FIG. 7 is a diagram showing an I2C interface control table in a PMIC in one embodiment, where the first 3 bits are enable signals for different modulation modes of the PMIC corresponding to the 0x07 register location, the three signals are not prioritized, and the switching power supply modulation mode of the PMIC can be adjusted according to the latest control instruction from the DDIC.

Fig. 8 is a Timing (Timing) control schematic diagram of a display control device according to an embodiment of the disclosure. Referring to fig. 8, when the DDIC recognizes that the expected load of the next frame of refresh frame is less than or equal to the preset first threshold, the DDIC will send an instruction to the PMIC through the SDA (Serial Data Line) signal of the I2C interface in the porch (VPorch) area before the next frame of refresh frame, and the PMIC receives the instruction and selects one of the N switching power supply modulation modes, for example, the PWM mode; at this time, the ripple frequency of the output voltage (ELVSS) is increased, and the ripple amplitude is reduced, so that it can be ensured that both the ripple frequency and the ripple amplitude of the PMIC output voltage (ELVSS) are within acceptable ranges before the next frame of image refreshing, and the occurrence of the phenomenon of water ripple in display is avoided.

Therefore, the display control device provided by the embodiment of the disclosure can eliminate the display water ripple phenomenon caused by too low ripple frequency and too large ripple amplitude of the PMIC output voltage of the display panel in the related art.

In addition, the embodiment of the disclosure further provides a terminal device, which includes: a processor; a memory for storing a computer program executable by the processor; the processor is configured to execute the computer program in the memory to implement the steps of the method as described above.

The processor is a control center of the terminal device, connects various parts of the entire electronic device using various interfaces and lines, and performs various functions of the electronic device and processes data by running or executing software programs and/or modules stored in the memory, and calling data stored in the memory. Optionally, the processor may include one or more processing cores; preferably, the processor may integrate an application processor and a modem processor, wherein the application processor primarily handles operating systems, object interfaces, application programs, etc., and the modem processor primarily handles wireless communications.

The memory may be used for storing software programs and modules, and may mainly include a storage program area and a storage data area, where the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the electronic device, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory may also include a memory controller to provide access to the memory by the processor.

The terminal device may further comprise an input unit operable to receive input digital or character information and to generate keyboard, mouse, joystick, optical or trackball signal inputs related to object settings and function control.

Although not shown, the terminal device may further include a display panel or the like, which is not described herein. In this embodiment, the processor in the terminal device loads executable files corresponding to the processes of one or more application programs into the memory according to the following instructions, and the processor runs the application programs stored in the memory, so as to implement the steps in any display control method provided in the present application.

Furthermore, the disclosed embodiments also provide a computer readable storage medium having stored thereon an executable computer program which when executed implements the steps of the method as described above.

Wherein the computer-readable storage medium may comprise: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like.

Because the instructions stored in the computer readable storage medium can execute the steps in any display control method provided in the present application, the beneficial effects that can be achieved by any display control method provided in the present application can be achieved, and detailed descriptions of the foregoing embodiments are omitted herein.

The following points need to be described:

(1) The drawings of the embodiments of the present disclosure relate only to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

(2) In the drawings for describing embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced for clarity, i.e., the drawings are not drawn to actual scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

(3) The embodiments of the present disclosure and features in the embodiments may be combined with each other to arrive at a new embodiment without conflict.

The above is merely a specific embodiment of the disclosure, but the protection scope of the disclosure should not be limited thereto, and the protection scope of the disclosure should be subject to the claims.

Claims

1. A display control method is applied to a display panel; characterized in that the method comprises:

Selecting one of N switching power supply modulation modes when the expected load is less than or equal to a first threshold, wherein N is greater than 1, and at least one of the ripple frequency and the ripple amplitude of the output voltage of different switching power supply modulation modes is different;

2. The display control method according to claim 1, characterized in that the method further comprises:

selecting a second switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a third threshold value and greater than or equal to a second threshold value;

wherein,

the third threshold is greater than the second threshold;

the second threshold is greater than the first threshold;

3. The display control method according to claim 2, wherein when the expected load is less than or equal to a first threshold value, selecting one of N switching power supply modulation modes, specifically comprises:

4. The display control method according to claim 2, wherein when the expected load is less than or equal to a first threshold value, selecting one of N switching power supply modulation modes, specifically comprises:

wherein,

the output voltage ripple frequency of the third switching power supply modulation mode is smaller than the output voltage ripple frequency of the second switching power supply modulation mode;

the output voltage ripple amplitude of the third switching power supply modulation mode is larger than that of the second switching power supply modulation mode; and is also provided with

5. The display control method according to claim 1, wherein a first switching power supply modulation mode of the N switching power supply modulation modes is a pulse width modulation mode, a second switching power supply modulation mode is a pulse frequency modulation mode, and a third switching power supply modulation mode is a pulse cross period modulation mode.

6. The display control method according to claim 1, wherein the expected load includes at least one of luminance data of a frame refresh picture and an image refresh frequency.

7. A display control device is applied to a display panel; the display control device is characterized by comprising:

8. The display control apparatus according to claim 7, characterized in that the display control apparatus further comprises:

a third selecting unit configured to select a second switching power supply modulation mode of the N switching power supply modulation modes when the expected load is less than or equal to a third threshold value and greater than or equal to a second threshold value;

wherein,

the third threshold is greater than the second threshold;

the second threshold is greater than the first threshold;

9. The display control apparatus according to claim 8, wherein the first selection unit is specifically configured to:

Or,

10. The display control apparatus according to claim 7, wherein the acquisition unit, the determination unit, and the first selection unit are integrated on a display driving integrated circuit; the switching power supply control unit is integrated on a power supply management integrated circuit.

11. A terminal device, comprising:

a processor;

a memory for storing a computer program executable by the processor;

the processor is configured to execute a computer program in the memory to implement the steps of the method of any one of claims 1 to 6.

12. A computer readable storage medium having stored thereon an executable computer program, characterized in that the computer program when executed implements the steps of the method according to any of claims 1 to 6.