Screen backlight frequency adjustment method, device, equipment and storage medium

Abstract

The present application provides a screen backlight frequency adjustment method, apparatus, device and storage medium. For a display screen with a variable refresh rate, the current refresh frequency of the display screen in a variable refresh rate mode is obtained in real time, and a backlight frequency target value for preventing water ripples from appearing on the display screen is determined based on the current refresh frequency. The current backlight frequency of the display screen is then adjusted based on the backlight frequency target value, thereby avoiding water ripples on the display screen and improving the display quality of the display screen.

Description

Technical Field

[0001] The present application relates to the field of liquid crystal display technology, and in particular to a method, device, equipment and storage medium for adjusting screen backlight frequency. Background Art

[0002] The refresh rate of an LCD screen refers to the screen's vertical scanning frequency, or the number of images it can display per second. The backlight frequency is the frequency at which the PWM signal used to control the backlighting of the LCD's light-emitting diodes (LEDs) adjusts. Overlap between the refresh rate and backlight frequency can cause ripples on the screen, affecting display quality.

[0003] In the prior art, for a screen with a fixed refresh rate, during the debugging process, the backlight frequency is usually adjusted according to the screen refresh rate, that is, the frequency corresponding to the fixed refresh rate and at which the water ripple phenomenon is not obvious is set as the backlight frequency.

[0004] However, for display screens that use a variable refresh rate mode, since the screen refresh rate will be adjusted in real time, if a fixed backlight frequency is still used, water ripples will still appear at some refresh rates. Summary of the Invention

[0005] The present application provides a screen backlight frequency adjustment method, device, equipment and storage medium to solve the problem of water ripples on VRR display screens in the prior art.

[0006] In one aspect, the present application provides a method for adjusting screen backlight frequency, comprising:

[0007] Get the current refresh rate of the display screen in variable refresh rate mode;

[0008] Determining a backlight frequency target value when no water ripples appear on the display screen based on the current refresh frequency;

[0009] The current backlight frequency of the display screen is adjusted according to the backlight frequency target value.

[0010] In some embodiments, determining a backlight frequency target value when no water ripples appear on the display screen based on the current refresh frequency includes:

[0011] Obtaining the preset relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen;

[0012] Based on the preset relationship, a backlight frequency target value corresponding to the current refresh frequency is determined.

[0013] In some embodiments, the preset relationship includes a corresponding relationship and / or a relationship function;

[0014] Before obtaining the preset relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen, the method further includes:

[0015] Determine the corresponding relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; and / or,

[0016] Determine the relationship function between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen.

[0017] In some embodiments, determining the correspondence between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen includes:

[0018] Obtaining a first frequency range corresponding to the refresh frequency and a second frequency range corresponding to the backlight frequency;

[0019] selecting a first refresh frequency within the first frequency range as a starting frequency;

[0020] Selecting a first corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the starting frequency;

[0021] adjusting the refresh frequency according to a frequency change sequence of the refresh frequency, wherein the frequency change sequence includes changing from a maximum value to a minimum value in the first frequency range, and / or changing from a minimum value to a maximum value in the first frequency range;

[0022] Determining a second refresh frequency at which water ripples appear on the display screen under the first corresponding backlight frequency, and determining a previous adjustment frequency of the second refresh frequency as an ending frequency corresponding to the starting frequency;

[0023] Determine a backlight frequency corresponding to a refresh frequency within a range from the starting frequency to the ending frequency as the first corresponding backlight frequency;

[0024] The second refresh frequency is used as the new starting frequency, and the step of selecting a new first corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the new starting frequency is returned, until all refresh frequencies within the first frequency range have corresponding backlight frequencies, thereby obtaining the corresponding relationship between the different refresh frequencies and the different backlight frequencies.

[0025] In some embodiments, determining the relationship function between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen includes:

[0026] Obtaining a first frequency range corresponding to a refresh frequency and a second frequency range corresponding to a backlight frequency;

[0027] selecting a third refresh frequency from within the first frequency range;

[0028] Selecting a second corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the third refresh frequency;

[0029] Based on the proportional relationship between the third refresh frequency and the second corresponding backlight frequency, a relationship function between the different refresh frequencies and the different backlight frequencies is determined.

[0030] In some embodiments, determining the backlight frequency target value corresponding to the current refresh frequency based on the preset relationship includes:

[0031] Based on the corresponding relationship, searching for a backlight frequency target value corresponding to the current refresh frequency; and / or,

[0032] Based on the relationship function, a backlight frequency target value corresponding to the current refresh frequency is calculated.

[0033] In some embodiments, the refresh frequency is the refresh frequency of the display screen in a variable refresh rate mode; and / or the backlight frequency is the adjustment frequency of a backlight PWM signal of a light-emitting diode in the display screen.

[0034] On the other hand, the present application provides a screen backlight frequency adjustment device, comprising:

[0035] A refresh rate acquisition module is used to obtain the current refresh rate of the display screen in variable refresh rate mode;

[0036] a backlight frequency determination module, configured to determine a backlight frequency target value when no water ripples appear on the display screen based on the current refresh frequency;

[0037] A backlight frequency adjustment module is used to adjust the current backlight frequency of the display screen according to the backlight frequency target value.

[0038] On the other hand, the present application provides a screen backlight frequency adjustment device, comprising: a memory, a processor;

[0039] Memory; a memory for storing instructions executable by the processor;

[0040] Among them, the processor is configured to: obtain the current refresh frequency of the display screen in the variable refresh rate mode; based on the current refresh frequency, determine the backlight frequency target value when no water ripples appear on the display screen; and adjust the current backlight frequency of the display screen according to the backlight frequency target value.

[0041] On the other hand, the present application provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, they are used to implement the screen backlight frequency adjustment method as described in any one of claims 1 to 7.

[0042] The present application provides a screen backlight frequency adjustment method, apparatus, device and storage medium. For a display screen with a variable refresh rate, the current refresh frequency of the display screen in a variable refresh rate mode is obtained in real time, and a backlight frequency target value for preventing water ripples from appearing on the display screen is determined based on the current refresh frequency. The current backlight frequency of the display screen is then adjusted based on the backlight frequency target value, thereby avoiding water ripples on the display screen and improving the display quality of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0044] Figure 1 A schematic diagram of the screen tearing;

[0045] Figure 2 This is a schematic diagram of the screen freeze;

[0046] Figure 3 is a schematic diagram of a variable refresh rate;

[0047] Figure 4 A schematic diagram of adjusting the backlight of an LCD screen;

[0048] Figure 5 This is a flowchart of a method for adjusting screen backlight frequency in some embodiments of the present application;

[0049] Figure 6 This is a flow chart of determining a target backlight frequency value when no water ripples appear on the display screen based on the current refresh frequency in some embodiments of the present application;

[0050] Figure 7 This is an example diagram of point-to-point correspondence for some embodiments of the present application;

[0051] Figure 8 This is an example diagram of the correspondence between sections and points in some embodiments of the present application;

[0052] Figure 9 A schematic diagram illustrating the correspondence between different refresh rates and different backlight frequencies according to some embodiments of the present application;

[0053] Figure 10 A schematic diagram of a function for determining the relationship between different refresh rates and different backlight frequencies in some embodiments of the present application;

[0054] Figure 11 This is a diagram of application scenarios of the screen backlight frequency adjustment method in some embodiments of the present application;

[0055] Figure 12 A schematic diagram of a circuit for adjusting the PWM duty cycle in some embodiments of the present application;

[0056] Figure 13 This is a structural schematic diagram of the screen backlight frequency adjustment device in some embodiments of the present application.

[0057] The above drawings illustrate specific embodiments of the present disclosure, which will be described in more detail below. These drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0058] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0060] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application are also intended to include plural forms unless the context clearly indicates otherwise.

[0061] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0062] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0063] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0064] First, let’s explain the terms involved in this application:

[0065] 1. Refresh Rate: Also known as Field Frequency, this refers to the vertical scanning frequency of the screen, or the number of times the screen can display an image per second. It's measured in Hertz (Hz). The higher the refresh rate, the more times the image is refreshed, the less flickering the image will appear, and the higher the picture quality.

[0066] 2. Screen tearing: When the previous frame (Frame(n)) displayed on the screen has not completely disappeared, a new frame (Frame(n+1)) is output to the display screen. Two different frames appear on the screen panel at the same time, that is, one scan signal (Scan) period corresponds to two frames. At this time, the screen refresh node has not been reached, and screen tearing occurs.

[0067] Figure 1 This is a schematic diagram of screen tearing, such as Figure 1 As shown, the refresh rate of the screen panel is fixed. During the first scan signal Scan(0 / 1) of the panel, the first frame Frame(1) of the graphics processing unit (GPU) is displayed on the panel. Before Frame(1) completely disappears, the second frame Frame(2) is output to the panel for display. At this time, the first scan signal Scan(0 / 1) corresponds to Frame(1) and Frame(2). Point a displays two frames simultaneously, but point a has not reached the first refresh node of the panel (16ms), that is, screen tearing occurs at point a. Similarly, screen tearing occurs at points b, c, and d.

[0068] 3. Screen stuttering: Due to inadequate game optimization or substandard device hardware configuration, some aspects of the game screen generation process are slowed down, resulting in a misalignment between the GPU output timing and the panel refresh time, causing screen stuttering.

[0069] Figure 2 This is a schematic diagram of the screen freeze, such as Figure 2 As shown, the panel refresh frequency of the screen is fixed. During the first scan signal Scan, the first frame Frame (1) output by the GPU is displayed on the panel; when the first refresh node 16ms is reached, the second scan signal Scan (1) corresponds to the second frame Frame (2); when the second refresh node 32ms is reached, the GPU does not output a new image, resulting in a time misalignment, which causes the image to freeze at point e; when the third refresh node 48ms is reached, the third frame Frame (3) output by the GPU is displayed on the panel.

[0070] 4. Variable Refresh Rate (VRR): This refers to a display screen whose refresh rate changes in response to the GPU's output frequency. It's primarily used (in gaming) to reduce or eliminate screen lag, stuttering, and tearing, ensuring smooth display and detailed image integrity. Existing variable refresh rate technologies include FreeSync (developed by AMD) and Gsync (developed by Nvidia).

[0071] Figure 3 is a schematic diagram of a variable refresh rate, such as Figure 3 As shown in the figure, the panel refresh frequency of the screen is not a fixed value. Instead, the panel is refreshed after the GPU output Frame is refreshed. That is, the panel refresh frequency changes with the GPU output frequency, thereby reducing or eliminating screen tearing and freezes.

[0072] 5. Backlight Adjustment: Currently, LCD backlight adjustment is typically achieved through digital dimming, which involves adjusting the PWM (Pulse Width Modulation) duty cycle. The PWM duty cycle refers to the percentage of a pulse cycle that is high. By adjusting the PWM duty cycle, the on-time of the LED backlight in the LCD screen is adjusted, thereby adjusting the screen brightness.

[0073] Figure 4 This is a schematic diagram of LCD screen backlight adjustment, such as Figure 4As shown, the PWM duty cycle corresponds to the screen brightness. For example, when the PWM duty cycle is 1, the screen brightness is 100%; when the PWM duty cycle is 0.5, the screen brightness is 50%; when the PWM duty cycle is 0.25, the screen brightness is 25%, and so on for other ratios.

[0074] 6. Water ripples: Due to the overlap between the refresh rate of the LCD screen and the backlight frequency of the LED backlight, water ripples appear on the screen in dark fields.

[0075] For a screen with a fixed refresh rate, during the debugging process, the backlight frequency is usually adjusted according to the screen refresh rate, that is, the frequency corresponding to the fixed refresh rate and at which the water ripple phenomenon is not obvious is set as the backlight frequency.

[0076] However, for display screens that use a variable refresh rate mode, since the screen refresh rate will be adjusted in real time, if a fixed backlight frequency is still used, water ripples will still appear at some refresh rates.

[0077] The screen backlight frequency adjustment method provided in this application is intended to solve the above technical problems in the prior art.

[0078] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0079] Figure 5 This is a flow chart of a method for adjusting screen backlight frequency in some embodiments of the present application. Figure 5 As shown, the method is explained by taking the application of the method to a processor capable of adjusting the screen backlight frequency of a display screen as an example. The method includes the following steps:

[0080] S100, obtaining the current refresh rate of the display screen in the variable refresh rate mode.

[0081] The display screen may be a liquid crystal display screen, specifically a liquid crystal display screen that supports operating in a variable refresh rate mode.

[0082] In addition, the screen backlight frequency adjustment method of the present application is to adjust the frequency in real time during the screen display process, and the current refresh frequency is the refresh frequency of the display screen at the current moment when it is working in the variable refresh rate mode. For example, the current refresh frequency can be 60Hz, 120Hz, etc.

[0083] S200 , determining a backlight frequency target value when no water ripples appear on the display screen based on the current refresh frequency.

[0084] After acquiring the current refresh frequency of the display screen in the variable refresh rate mode, the processor determines a corresponding backlight frequency target value based on the acquired current refresh frequency to facilitate backlight frequency adjustment.

[0085] To ensure that the display screen does not have water ripples, the backlight frequency target value can be an integer multiple of the current refresh rate. For example, when the current refresh rate is 60Hz, the corresponding backlight frequency target value can be 180Hz.

[0086] In some embodiments, the backlight frequency target value may also be other multiples of the current refresh rate, such as 1.5 times, 2.5 times (with a decimal place of 5), etc. For example, when the current refresh rate is 90 Hz, the corresponding backlight frequency target value may be 225 Hz, etc.

[0087] S300: Adjust the current backlight frequency of the display screen according to the backlight frequency target value.

[0088] After determining the target backlight frequency value corresponding to the current refresh rate, the processor adjusts the current backlight frequency of the display screen according to the target backlight frequency value. In some embodiments, if the current backlight frequency is consistent with the target backlight frequency value, the current backlight frequency is maintained unchanged; if the current backlight frequency is inconsistent with the target backlight frequency value, the current backlight frequency is adjusted to the target backlight frequency value.

[0089] Since the backlight frequency target value is a backlight frequency at which no water ripples appear on the display screen at the current refresh frequency, the appearance of water ripples on the display screen can be avoided by adjusting the current backlight frequency of the display screen.

[0090] Some embodiments provide a screen backlight frequency adjustment method. For a display screen with a variable refresh frequency, the current refresh frequency of the display screen in a variable refresh rate mode is obtained in real time, and a backlight frequency target value at which no water ripples appear on the display screen is determined based on the current refresh frequency. The current backlight frequency of the display screen is then adjusted based on the backlight frequency target value, thereby avoiding the appearance of water ripples on the display screen and improving the display quality of the display screen.

[0091] Figure 6 FIG. 1 is a flow chart of determining a backlight frequency target value when no water ripples appear on the display screen based on the current refresh frequency in some embodiments of the present application. Figure 6 As shown, the processing flow includes the following steps:

[0092] S230: Obtaining preset relationships between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen;

[0093] S240: Determine a backlight frequency target value corresponding to the current refresh frequency based on a preset relationship.

[0094] In some embodiments, when determining the target backlight frequency value, the processor may first obtain a preset relationship between different refresh rates and different backlight frequencies under the condition that water ripples do not appear on the display screen. Based on this preset relationship, the processor may then determine the target backlight frequency value corresponding to the current refresh frequency that does not appear water ripples.

[0095] In some embodiments, the processor can analyze the existing frequency data to obtain the preset relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen. Of course, the preset relationship between different refresh frequencies and different backlight frequencies can also be predetermined and stored in the memory. When the backlight frequency target value needs to be determined, the processor directly obtains the preset relationship from the memory. Of course, the processor can also obtain the preset relationship between different refresh frequencies and different backlight frequencies from an external device. For example, the preset relationship is stored in the cloud. When the backlight frequency target value needs to be determined, the processor obtains the preset relationship from the cloud. In addition, the external device can also be an external storage medium, etc. Some embodiments do not limit the method of obtaining medical images.

[0096] In some embodiments, the processor determines a backlight frequency target value corresponding to the current refresh frequency based on a preset relationship, thereby quickly and accurately obtaining a backlight frequency that does not cause water ripples at the current refresh frequency.

[0097] In some embodiments, the preset relationship includes a corresponding relationship, that is, a corresponding relationship between frequency values ​​of different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen.

[0098] In some embodiments, Fvrr is defined to represent the refresh frequency, Fled is defined to represent the backlight frequency, and the correspondence between the refresh frequency and the backlight frequency includes point-to-point correspondence, point-to-segment correspondence, segment-to-point correspondence, and segment-to-segment correspondence.

[0099] The point-to-point correspondence refers to a single refresh frequency corresponding to a single backlight frequency, for example, Fvrri corresponds to Fledi.

[0100] Point-segment correspondence means that a single refresh frequency corresponds to a frequency segment composed of multiple backlight frequencies, for example, Fvrri corresponds to Fledm-Fledn.

[0101] Segment-point correspondence means that multiple refresh frequencies correspond to a single backlight frequency, for example, Fvrrm-Fvrrn corresponds to Fledi.

[0102] Segment-segment correspondence means that multiple refresh frequencies correspond to frequency segments composed of multiple backlight frequencies, for example, Fvrrm-Fvrrn corresponds to Fledm-Fledn.

[0103] In practical applications, any one or more of the above correspondence forms may be selected according to actual conditions, for example, only point-to-point correspondence may be used, or both point-to-point correspondence and segment-to-point correspondence may be used.

[0104] In some embodiments, the correspondence between the refresh frequency and the backlight frequency may be stored in a table format.

[0105] For example, Table 1 and Table 2 are examples of point-to-point correspondence and segment-to-point correspondence, respectively.

[0106] Refresh rate Backlight frequency Fvrr1 Fled1 Fvrr2 Fled2 … … Fvrrn Fledn

[0107] Table 1

[0108]

[0109]

[0110] Table 2

[0111] In some embodiments, the correspondence between the refresh frequency and the backlight frequency may also be stored in the form of a coordinate graph.

[0112] For example, Figure 7 This is an example diagram of point-to-point correspondence in some embodiments of the present application, where a single refresh frequency value corresponds to a single backlight frequency.

[0113] For example, Figure 8 This is an example diagram of segment-point correspondence in some embodiments of the present application, where multiple refresh frequency values ​​correspond to a single backlight frequency.

[0114] When the preset relationship includes a corresponding relationship, correspondingly, before obtaining the preset relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen, the screen backlight frequency adjustment method also includes: S210, determining the corresponding relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen.

[0115] When the preset relationship includes a corresponding relationship, correspondingly determining the backlight frequency target value corresponding to the current refresh frequency includes: searching for the backlight frequency target value corresponding to the current refresh frequency based on the corresponding relationship.

[0116] Some embodiments predetermine the correspondence between different refresh frequencies and different backlight frequencies, and based on the correspondence, quickly search and determine the backlight frequency target value corresponding to the current refresh frequency, thereby facilitating adjustment of the backlight frequency.

[0117] In some embodiments, the preset relationship includes a relationship function, that is, a calculation formula for the refresh frequency and the backlight frequency under the condition that no water ripples appear on the display screen.

[0118] In some embodiments, Fvrr is defined as the refresh frequency, Fled is defined as the backlight frequency, and the calculation formula of the refresh frequency and the backlight frequency can be expressed using a linear formula, for example, Fled = K*Fvrr, where K is the coefficient of the relationship between the refresh frequency and the backlight frequency.

[0119] In some embodiments, the calculation formulas for the refresh frequency and the backlight frequency may also be expressed by other formulas, which are not limited here.

[0120] When the preset relationship includes a relationship function, correspondingly, before obtaining the preset relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen, it also includes: S220, determining the relationship function between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen.

[0121] When the preset relationship includes a relationship function, correspondingly, determining the backlight frequency target value corresponding to the current refresh frequency includes: calculating the backlight frequency target value corresponding to the current refresh frequency based on the relationship function.

[0122] Some embodiments predetermine a calculation formula for different refresh frequencies and different backlight frequencies. Based on the calculation formula, a backlight frequency target value corresponding to the current refresh frequency can be quickly calculated and determined, thereby facilitating adjustment of the backlight frequency.

[0123] In some embodiments, the preset relationship includes a corresponding relationship and a relationship function.

[0124] In some embodiments, the processor may simultaneously determine a first backlight frequency target value based on the corresponding relationship and a second backlight frequency target value based on the relationship function. After obtaining the first backlight frequency target value and the second backlight frequency target value, the processor may determine a final backlight frequency target value based on the first backlight frequency target value and the second backlight frequency target value.

[0125] Further, Fled_tar1 is defined to represent a first backlight frequency target value, Fled_tar2 is defined to represent a second backlight frequency target value, and Fled_tar is defined to represent a final backlight frequency target value. Determining the final backlight frequency target value based on the first backlight frequency target value and the second backlight frequency target value specifically includes:

[0126] If Fled_tar1=Fled_tar2, then Fled_tar=Fled_tar1=Fled_tar2;

[0127] If Fled_tar1≠Fled_tar2, use any of the following rules to determine Fled_tar:

[0128] (1) Fled_tar = a*Fled_tar1+b*Fled_tar2, i.e., the weighted sum of Fled_tar1 and Fled_tar2 is used as Fled_tar, where a is the weight coefficient corresponding to the first backlight frequency target value, and b is the weight coefficient corresponding to the second backlight frequency target value;

[0129] (2) Fled_tar = max[Fled_tar1, Fled_tar2], i.e. the maximum value of Fled_tar1 and Fled_tar2 is taken as Fled_tar;

[0130] (3) Fled_tar=min[Fled_tar1, Fled_tar2], that is, the minimum value of Fled_tar1 and Fled_tar2 is taken as Fled_tar.

[0131] It is understandable that in practical applications, other rules may also be used to determine Fled_tar.

[0132] When the preset relationship includes a corresponding relationship and a relationship function, correspondingly, before obtaining the preset relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen, it also includes: S210, determining the corresponding relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen; S220, determining the relationship function between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen.

[0133] When the preset relationship includes a corresponding relationship and a relationship function, the corresponding backlight frequency target value corresponding to the current refresh frequency is determined, including: based on the corresponding relationship, searching for the first backlight frequency target value corresponding to the current refresh frequency; based on the relationship function, calculating the second backlight frequency target value corresponding to the current refresh frequency; and determining the final backlight frequency target value based on the first backlight frequency target value and the second backlight frequency target value.

[0134] Some embodiments can improve the accuracy of the backlight frequency target value by predetermining the correspondence between different refresh frequencies and different backlight frequencies and a calculation formula, and determining the final backlight frequency target value based on the backlight frequency target value obtained by the correspondence and the calculation formula.

[0135] In some embodiments, taking the case where the correspondence is segment-point correspondence as an example, the processing flow of determining the correspondence between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen is explained.

[0136] Figure 9 This is a schematic diagram of determining the corresponding relationship between different refresh frequencies and different backlight frequencies in some embodiments of the present application, such as Figure 9 As shown, the processing flow includes the following steps:

[0137] S211, obtaining a first frequency range corresponding to a refresh frequency and a second frequency range corresponding to a backlight frequency;

[0138] S212, selecting a first refresh frequency within a first frequency range as a starting frequency;

[0139] S213, selecting a first corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the starting frequency;

[0140] S214, adjusting the refresh frequency according to a frequency change sequence of the refresh frequency, the frequency change sequence including changing from a maximum value to a minimum value in the first frequency range, and / or changing from a minimum value to a maximum value in the first frequency range;

[0141] S215, determining a second refresh frequency at which water ripples appear on the display screen under the first corresponding backlight frequency, and determining a previous adjustment frequency of the second refresh frequency as an ending frequency corresponding to the starting frequency;

[0142] S216, determining a backlight frequency corresponding to a refresh frequency within a range from a starting frequency to an ending frequency as a first corresponding backlight frequency;

[0143] S217, taking the second refresh frequency as the new starting frequency, and returning to the step of selecting a new first corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the new starting frequency, until all refresh frequencies within the first frequency range have corresponding backlight frequencies, and obtaining the correspondence between different refresh frequencies and different backlight frequencies.

[0144] The first frequency range corresponding to the refresh frequency may be specifically 42 Hz-244 Hz, and the second frequency range corresponding to the backlight frequency may be specifically 0 Hz-1 kHz. It is understood that the frequency range may be adjusted based on actual conditions.

[0145] In some embodiments, taking the first refresh frequency as the minimum value in the first frequency range (i.e., 42 Hz) as an example, 42 Hz is first selected as the starting frequency, and the first corresponding backlight frequency at which no water ripples appear on the display screen when the refresh frequency is 42 Hz is determined, for example, 126 Hz.

[0146] Then, the refresh rate is adjusted in the order of changing toward 244 Hz (ie, changing from small to large), for example, adjusting to 43 Hz, 44 Hz, etc., and the adjustment amplitude can be selected to be 1 Hz or other amplitudes.

[0147] At the same time, when the backlight frequency is the first corresponding backlight frequency of 126 Hz, after adjusting the refresh frequency, it is determined whether water ripples appear on the display screen, and the refresh frequency at which water ripples appear is determined to be the second refresh frequency. For example, if the second refresh frequency is 51 Hz, that is, water ripples appear when the refresh frequency is adjusted to 51 Hz. In this case, the previous adjustment frequency of 50 Hz of 51 Hz is determined to be the end frequency corresponding to 42 Hz, and the backlight frequency corresponding to the refresh frequency within the range of the first starting frequency of 42 Hz to the first ending frequency of 50 Hz is determined to be the first corresponding backlight frequency of 126 Hz.

[0148] Then, 51 Hz is used as a new starting frequency (ie, the second starting frequency), and the above process is repeated until the backlight frequencies corresponding to all refresh frequencies are obtained.

[0149] In some embodiments, the first refresh rate may also be the maximum value in the first frequency range (ie, 244 Hz). Correspondingly, the frequency change sequence is from high to low, i.e., from high to low. The principles of other processing steps are the same and will not be repeated here.

[0150] In some embodiments, the first refresh rate may also be an intermediate value in the first frequency range (e.g., 100 Hz). Correspondingly, the frequency change sequence includes changing from 100 Hz to 42 Hz and from 100 Hz to 244 Hz, i.e., including both changes from large to small and from small to large. The principles of other processing steps are the same and are not repeated here.

[0151] After obtaining the backlight frequencies corresponding to all refresh frequencies within the first frequency range, the corresponding relationship between the refresh frequencies and the backlight frequencies may be saved in the form of a table and / or a coordinate graph.

[0152] In some embodiments, taking the case where the relationship function is a linear relationship as an example, the processing flow of determining the relationship function between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen is explained.

[0153] Figure 10 This is a schematic diagram of a function for determining the relationship between different refresh rates and different backlight frequencies in some embodiments of the present application, such as Figure 10 As shown, the processing flow includes the following steps:

[0154] S221, obtaining a first frequency range corresponding to the refresh frequency and a second frequency range corresponding to the backlight frequency;

[0155] S222, selecting a third refresh frequency from the first frequency range;

[0156] S223, selecting a second corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the third refresh frequency;

[0157] S224 , determining a relationship function between different refresh frequencies and different backlight frequencies based on a proportional relationship between the third refresh frequency and the second corresponding backlight frequency.

[0158] The first frequency range corresponding to the refresh frequency may be specifically 42 Hz-244 Hz, and the second frequency range corresponding to the backlight frequency may be specifically 0 Hz-1 kHz. It is understood that the frequency range may be adjusted based on actual conditions.

[0159] Based on the characteristics of frequency interference, when two frequencies change in equal proportion, the frequency at which the interference effect occurs will change, while the interference effect will not change. Therefore, the corresponding second backlight frequency can be determined based on any frequency value in the first frequency range, thereby obtaining a linear relationship function between the refresh frequency and the backlight frequency.

[0160] In some embodiments, taking the third refresh frequency as 60 Hz in the first frequency range as an example, first determine a second corresponding backlight frequency at which no water ripples appear on the display screen when the refresh frequency is 60 Hz, for example, 120 Hz.

[0161] Then, based on the proportional relationship between the third refresh frequency 60 Hz and the second corresponding backlight frequency 120 Hz, a relationship function between different refresh frequencies and different backlight frequencies is determined, that is, the K value in Fled=K*Fvrr is obtained. For example, K=120 / 60=2.

[0162] Finally, the relationship function between different refresh frequencies and different backlight frequencies is determined to be Fled=2*Fvrr.

[0163] In some embodiments, when selecting the second corresponding backlight frequency from the second frequency range, there may be multiple second corresponding backlight frequencies. For example, when the refresh frequency is 60Hz, water ripples will not appear at backlight frequencies of 90Hz, 120Hz, 150Hz, 180Hz, and 210Hz. At this time, multiple Ki can be determined based on multiple second corresponding backlight frequencies, such as K1, K2, ..., Kn, etc., and then the final K value can be determined based on multiple Ki.

[0164] In some embodiments, the final K value is determined based on multiple Ki values, which can be determined by the following rules:

[0165]

[0166] Wherein, p is the rate constant, and p is greater than or equal to 2.

[0167] For example, when the value of p is 2, based on the refresh frequency of 60Hz and multiple backlight frequencies of 90Hz, 120Hz, 150Hz, 180Hz, and 210Hz, multiple K values ​​can be obtained, which are 1.5, 2, 2.5, 3, and 3.5 respectively. Based on the above rules, K=2 can be finally determined.

[0168] In some embodiments, the backlight frequency is an adjustment frequency of a backlight PWM signal of a light emitting diode (LED) in a display screen, wherein the light emitting diode (LED) is a backlight LED in a liquid crystal display screen.

[0169] In some embodiments, after calculating the target backlight frequency, the processor directly outputs a corresponding control signal in the form of a PWM waveform to the backlight driver module in the display screen. After receiving the PWM signal from the processor, the backlight driver module amplifies the PWM signal and outputs a backlight drive signal, which is used to drive the backlight LEDs. Thus, by adjusting the frequency of the backlight PWM signal to match the refresh rate of the display screen, ripples caused by the overlap of the two frequencies can be avoided, thereby improving screen display quality.

[0170] In some embodiments, the application scenarios of the screen backlight frequency adjustment method of the present application are explained.

[0171] Figure 11 This is an application scenario diagram of the screen backlight frequency adjustment method in some embodiments of the present application, such as Figure 11 As shown in the figure, the application scenarios mainly include:

[0172] (1) Obtain the video stream to be played and perform video decoding and other processing;

[0173] (2) Optimizing the image quality of the video display content, including gray consistency adjustment, brightness adjustment, and adjustment of hue, saturation, concentration, dynamic contrast, and GAMMA curve, to improve the display effect;

[0174] (3) Packaging and format conversion of the processed data, and outputting the video stream to the LCD panel;

[0175] (4) monitoring the current refresh rate of the video stream of the output value LCD panel;

[0176] (5) Based on the current refresh frequency obtained through monitoring, the screen backlight frequency adjustment method of the present application is used to determine the corresponding backlight frequency target value;

[0177] (6) Outputting the corresponding control signal to the backlight driver module in the form of a PWM waveform;

[0178] (7) The backlight driving module amplifies the received PWM signal and outputs a backlight driving signal to drive the backlight LED.

[0179] In some embodiments, during the above processing, the functions of steps (1) to (6) can all be implemented by a SOC (System on Chip). SOC is a system-level chip that has built-in RAM (Random Access Memory) and ROM (Read-Only Memory), and can also store system-level code, that is, it can run an operating system.

[0180] In some embodiments, the brightness adjustment of the backlight LED is achieved by adjusting the PWM duty cycle.

[0181] Figure 12 This is a circuit diagram of PWM duty cycle adjustment in some embodiments of the present application, such as Figure 12 As shown, the SOC sends the PWM signal to the backlight driver IC (Integrated Circuit Chip), which enhances the driving capability of the PWM signal through the DRV port, obtains a PWM pulse driving signal, and outputs it to the backlight LED.

[0182] The PWM pulse drive signal is generated based on two parameters: backlight frequency and duty cycle. The frequency parameter is the corresponding backlight frequency target value determined by the screen backlight frequency adjustment method of this application, and is used to adjust the backlight frequency. In some embodiments, the duration of a change cycle of the PWM pulse signal is the inverse of the backlight frequency. The duty cycle parameter is used to adjust the proportion of the high-level duration in a change cycle of the PWM signal. The duty cycle parameter is positively correlated with the proportion of the high-level duration. The duty cycle parameter is determined based on the brightness of the image corresponding to the backlight source. The PWM pulse drive signal is used to adjust the brightness of the backlight LED.

[0183] In addition, the backlight driver IC collects current through the ISEN port, and based on the current collection result, sends a voltage control signal to the LED voltage control system through the FB port, thereby controlling the power supply voltage V0 of the backlight LED.

[0184] It should be understood that, although the various steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they may be performed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily performed at the same time, but may be performed at different times, and their execution order is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of sub-steps or stages of other steps.

[0185] Figure 13 This is a schematic diagram of the structure of the screen backlight frequency adjustment device in some embodiments of the present application, such as Figure 13 As shown, the device includes:

[0186] A refresh rate acquisition module 100 is used to acquire the current refresh rate of the display screen in a variable refresh rate mode;

[0187] A backlight frequency determination module 200 is used to determine a backlight frequency target value when no water ripples appear on the display screen based on the current refresh frequency;

[0188] The backlight frequency adjustment module 300 is configured to adjust the current backlight frequency of the display screen according to the backlight frequency target value.

[0189] Some embodiments provide a screen backlight frequency adjustment device. For a display screen with a variable refresh frequency, the current refresh frequency of the display screen in a variable refresh rate mode is obtained in real time, and a backlight frequency target value for preventing water ripples from appearing on the display screen is determined based on the current refresh frequency. The current backlight frequency of the display screen is then adjusted based on the backlight frequency target value, thereby avoiding water ripples from appearing on the display screen and improving the display quality of the display screen.

[0190] For the specific definition of the screen backlight frequency adjustment device, please refer to the definition of the screen backlight frequency adjustment method above, which will not be repeated here. The various modules in the above-mentioned screen backlight frequency adjustment device can be implemented in whole or in part by software, hardware and their combination. The above-mentioned modules can be embedded in or independent of the processor in the electronic device in the form of hardware, or can be stored in the memory of the electronic device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0191] In some embodiments, a screen backlight frequency adjustment device is provided, which includes: a memory, a processor; a memory; a memory for storing processor executable instructions; wherein the processor is configured to: obtain the current refresh frequency of the display screen in a variable refresh rate mode; determine the backlight frequency target value when no water ripples appear on the display screen based on the current refresh frequency; and adjust the current backlight frequency of the display screen according to the backlight frequency target value.

[0192] In some embodiments, a computer-readable storage medium is provided, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the screen backlight frequency adjustment method in the above embodiments.

[0193] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0194] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0195] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A screen backlight frequency adjustment method, characterized in that: include: Get the current refresh rate of the display screen in variable refresh rate mode; Obtaining the preset relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; Based on the preset relationship, determining a backlight frequency target value corresponding to the current refresh frequency; adjusting the current backlight frequency of the display screen according to the backlight frequency target value; The preset relationship includes a corresponding relationship and / or a relationship function; Before obtaining the preset relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen, the method further includes: Determine the corresponding relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; and / or, Determine the relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; The function of determining the relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen includes: Obtaining a first frequency range corresponding to the refresh frequency and a second frequency range corresponding to the backlight frequency; selecting a third refresh frequency from within the first frequency range; Selecting a second corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the third refresh frequency; Based on the proportional relationship between the third refresh frequency and the second corresponding backlight frequency, a relationship function between the different refresh frequencies and the different backlight frequencies is determined.

2. The method according to claim 1, characterized in that The determining of the correspondence between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen includes: Obtaining a first frequency range corresponding to the refresh frequency and a second frequency range corresponding to the backlight frequency; selecting a first refresh frequency within the first frequency range as a starting frequency; Selecting a first corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the starting frequency; adjusting the refresh frequency according to a frequency change sequence of the refresh frequency, wherein the frequency change sequence includes changing from a maximum value to a minimum value in the first frequency range, and / or changing from a minimum value to a maximum value in the first frequency range; Determining a second refresh frequency at which water ripples appear on the display screen under the first corresponding backlight frequency, and determining a previous adjustment frequency of the second refresh frequency as an ending frequency corresponding to the starting frequency; Determine a backlight frequency corresponding to a refresh frequency within a range from the starting frequency to the ending frequency as the first corresponding backlight frequency; The second refresh frequency is used as the new starting frequency, and the step of selecting a new first corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the new starting frequency is returned, until all refresh frequencies within the first frequency range have corresponding backlight frequencies, thereby obtaining the corresponding relationship between the different refresh frequencies and the different backlight frequencies.

3. The method according to claim 1, characterized in that The determining, based on the preset relationship, a backlight frequency target value corresponding to the current refresh frequency includes: Based on the corresponding relationship, searching for a backlight frequency target value corresponding to the current refresh frequency; and / or, Based on the relationship function, a backlight frequency target value corresponding to the current refresh frequency is calculated.

4. The method according to any one of claims 1 to 3, characterized in that The backlight frequency is the adjustment frequency of the backlight PWM signal of the light emitting diode in the display screen.

5. A screen backlight frequency adjustment device, characterized in that: include: A refresh rate acquisition module is used to obtain the current refresh rate of the display screen in the variable refresh rate mode; A backlight frequency determination module is used to obtain a preset relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen; Based on the preset relationship, determining a backlight frequency target value corresponding to the current refresh frequency; a backlight frequency adjustment module, configured to adjust the current backlight frequency of the display screen according to the backlight frequency target value; The preset relationship includes a corresponding relationship and / or a relationship function; Before obtaining the preset relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen, the method further includes: Determine the corresponding relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; and / or, Determine the relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; The function of determining the relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen includes: Obtaining a first frequency range corresponding to the refresh frequency and a second frequency range corresponding to the backlight frequency; selecting a third refresh frequency from within the first frequency range; Selecting a second corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the third refresh frequency; Based on the proportional relationship between the third refresh frequency and the second corresponding backlight frequency, a relationship function between the different refresh frequencies and the different backlight frequencies is determined.

6. A screen backlight frequency adjustment device, characterized in that: include: Memory, processor; Memory; a memory for storing instructions executable by the processor; The processor is configured to: obtain a current refresh frequency of a display screen in a variable refresh rate mode; obtain a preset relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen; determine a backlight frequency target value corresponding to the current refresh frequency based on the preset relationship; and adjust the current backlight frequency of the display screen according to the backlight frequency target value; The preset relationship includes a corresponding relationship and / or a relationship function; Before obtaining the preset relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen, the method further includes: Determine the corresponding relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; and / or, Determine the relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen; The function of determining the relationship between different refresh rates and different backlight frequencies under the condition that no water ripples appear on the display screen includes: Obtaining a first frequency range corresponding to the refresh frequency and a second frequency range corresponding to the backlight frequency; selecting a third refresh frequency from within the first frequency range; Selecting a second corresponding backlight frequency from the second frequency range at which no water ripples appear on the display screen when the refresh frequency is the third refresh frequency; Based on the proportional relationship between the third refresh frequency and the second corresponding backlight frequency, a relationship function between the different refresh frequencies and the different backlight frequencies is determined.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the screen backlight frequency adjustment method according to any one of claims 1 to 4.

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