CN113724656A - Screen backlight frequency adjusting method, device, equipment and storage medium - Google Patents
Screen backlight frequency adjusting method, device, equipment and storage medium Download PDFInfo
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- CN113724656A CN113724656A CN202010455268.XA CN202010455268A CN113724656A CN 113724656 A CN113724656 A CN 113724656A CN 202010455268 A CN202010455268 A CN 202010455268A CN 113724656 A CN113724656 A CN 113724656A
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
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Abstract
The application provides a screen backlight frequency adjusting method, a screen backlight frequency adjusting device and a storage medium, for a display screen with a variable refreshing frequency, the current refreshing frequency of the display screen in a variable refreshing rate mode is obtained in real time, a backlight frequency target value of the display screen without water ripples is determined according to the current refreshing frequency, and then the current backlight frequency of the display screen is adjusted according to the backlight frequency target value, so that the water ripples of the display screen can be avoided, and the display quality of the display screen is improved.
Description
Technical Field
The present disclosure relates to the field of liquid crystal display technologies, and in particular, to a method, an apparatus, a device, and a storage medium for adjusting a backlight frequency of a screen.
Background
The refresh frequency of the lcd screen refers to the vertical scanning frequency of the screen, i.e. the number of times that the screen can display images per second, and the backlight frequency is the adjustment frequency of the backlight PWM signal of the led in the lcd screen. Due to the fact that the refreshing frequency and the backlight frequency are overlapped, water ripples appear on the display screen, and display quality is affected.
In the prior art, for a screen with a fixed refresh frequency, in a debugging process, a backlight frequency is usually adjusted according to the refresh frequency of the screen, that is, a frequency corresponding to the fixed refresh frequency and having no obvious water ripple phenomenon is set as the backlight frequency.
However, for the display screen adopting the variable refresh rate mode, since the refresh frequency of the screen is adjusted in real time, if the fixed backlight frequency is still adopted, the water ripple condition still occurs under the partial refresh frequency.
Disclosure of Invention
The application provides a screen backlight frequency adjusting method, a screen backlight frequency adjusting device, screen backlight frequency adjusting equipment and a storage medium, which are used for solving the problem that a VRR display screen in the prior art is prone to water ripples.
In one aspect, the present application provides a method for adjusting a backlight frequency of a screen, including:
acquiring the current refresh frequency of a display screen in a variable refresh rate mode;
determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency;
and adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
In some embodiments, the determining a backlight frequency target value when the display screen is not rippled based on the current refresh frequency includes:
acquiring a preset relation between different refreshing frequencies and different backlight frequencies under the condition that a display screen does not have water ripples;
and determining a backlight frequency target value corresponding to the current refresh frequency based on the preset relation.
In some embodiments, the preset relationship comprises a correspondence and/or a relationship function;
the obtaining, under the condition that the display screen does not have water ripples, before the preset relationship between different refresh frequencies and different backlight frequencies, further includes:
determining the corresponding relation between different refreshing frequencies and different backlight frequencies under the condition that the display screen does not have water ripples; and/or the presence of a gas in the gas,
and determining the relation function of different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples.
In some embodiments, the determining the correspondence between different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples comprises:
acquiring a first frequency range corresponding to a refreshing frequency and a second frequency range corresponding to a backlight frequency;
selecting a first refresh frequency within the first frequency range as a start frequency;
selecting a first corresponding backlight frequency from the second frequency range, wherein when the refresh frequency is the starting frequency, the display screen does not have water ripples;
adjusting the refresh frequency in a frequency change sequence of the refresh frequency, the frequency change sequence comprising a change from a maximum value to a minimum value in the first frequency range and/or a change from a minimum value to a maximum value in the first frequency range;
determining a second refresh frequency of a display screen with water ripples under the first corresponding backlight frequency, and determining a previous adjusting frequency of the second refresh frequency as an ending frequency corresponding to the starting frequency;
determining a backlight frequency corresponding to a refresh frequency in a range from the starting frequency to the ending frequency as the first corresponding backlight frequency;
and taking the second refreshing frequency as a new initial frequency, and returning to the step of selecting a new first corresponding backlight frequency from the second frequency range, wherein when the refreshing frequency is the new initial frequency, no water ripples appear on the display screen, until all the refreshing frequencies in the first frequency range have corresponding backlight frequencies, so as to obtain the corresponding relation between different refreshing frequencies and different backlight frequencies.
In some embodiments, the determining a function of different refresh frequencies versus different backlight frequencies without moire on the display screen comprises:
acquiring a first frequency range corresponding to a refreshing frequency and a second frequency range corresponding to a backlight frequency;
selecting a third refresh frequency from the first frequency range;
selecting a second corresponding backlight frequency from the second frequency range, wherein when the refresh frequency is the third refresh frequency, the display screen does not have water ripples;
and determining a relation function of the different refresh frequencies and the different backlight frequencies based on the proportional relation between the third refresh frequency and the second corresponding backlight frequency.
In some embodiments, the determining, based on the preset relationship, a backlight frequency target value corresponding to the current refresh frequency includes:
searching a backlight frequency target value corresponding to the current refreshing frequency based on the corresponding relation; and/or the presence of a gas in the gas,
and calculating a backlight frequency target value corresponding to the current refreshing frequency based on the relation function.
In some embodiments, the refresh frequency is a refresh frequency of the display screen in a variable refresh rate mode; and/or the backlight frequency is the adjusting frequency of the backlight PWM signal of the light emitting diode in the display screen.
In another aspect, the present application provides a screen backlight frequency adjusting apparatus, including:
the refresh frequency acquisition module is used for acquiring the current refresh frequency of the display screen in a variable refresh rate mode;
the backlight frequency determining module is used for determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency;
and the backlight frequency adjusting module is used for adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
In another aspect, the present application provides a screen backlight frequency adjusting apparatus, including: a memory, a processor;
a memory; a memory for storing the processor-executable instructions;
wherein the processor is configured to: acquiring the current refresh frequency of a display screen in a variable refresh rate mode; determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency; and adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
In another aspect, the present application provides a computer-readable storage medium having stored therein computer-executable instructions for implementing the screen backlight frequency adjustment method according to any one of claims 1 to 7 when executed by a processor.
The application provides a screen backlight frequency adjusting method, a screen backlight frequency adjusting device and a storage medium, for a display screen with a variable refreshing frequency, the current refreshing frequency of the display screen in a variable refreshing rate mode is obtained in real time, a backlight frequency target value of the display screen without water ripples is determined according to the current refreshing frequency, and then the current backlight frequency of the display screen is adjusted according to the backlight frequency target value, so that the water ripples of the display screen can be avoided, and the display quality of the display screen is improved.
Drawings
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 disclosure.
FIG. 1 is a schematic view of a torn frame;
FIG. 2 is a diagram illustrating a picture stuck;
FIG. 3 is a schematic diagram of a variable refresh rate;
FIG. 4 is a schematic diagram of a backlight adjustment of an LCD screen;
FIG. 5 is a flowchart illustrating a method for adjusting a backlight frequency of a display device according to some embodiments of the present disclosure;
FIG. 6 is a flowchart illustrating a process of determining a target backlight frequency value when a display screen is not rippled based on a current refresh frequency according to some embodiments of the present disclosure;
FIG. 7 is an exemplary graph of point-to-point correspondence according to some embodiments of the present application;
FIG. 8 is an exemplary graph of segment-point correspondences in accordance with some embodiments of the present application;
FIG. 9 is a diagram illustrating the determination of the correspondence between different refresh frequencies and different backlight frequencies according to some embodiments of the present application;
FIG. 10 is a schematic diagram of determining a function of different refresh frequencies versus different backlight frequencies according to some embodiments of the present application;
FIG. 11 is a diagram illustrating an application scenario of a method for adjusting a backlight frequency according to some embodiments of the present application;
FIG. 12 is a circuit schematic of PWM duty cycle adjustment according to some embodiments of the present application;
fig. 13 is a schematic structural diagram of a screen backlight frequency adjusting device according to some embodiments of the present application.
With the foregoing drawings in mind, certain embodiments of the disclosure have been shown and described in more detail below. These drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the disclosure to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations 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.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or system in which the element is included.
The terms referred to in this application are explained first:
1. refresh frequency (Refresh Rate): the term "Field Frequency" refers to the vertical scanning Frequency of the screen, i.e. the number of images per second that can be displayed on the screen, and is expressed in hertz (Hz). The higher the refresh frequency, the more the number of image refreshes, the smaller the flicker of the image display, and the higher the picture quality.
2. Picture Tearing (Tearing): when the previous Frame (n)) displayed on the screen has not completely disappeared, a new Frame (n +1)) is outputted to the display screen, two different frames appear on the panel of the screen at the same time, that is, two frames correspond to one Scan signal (Scan) period, at this time, the refresh node of the screen is not reached, and the screen is torn.
Fig. 1 is a schematic diagram of Frame tearing, as shown in fig. 1, a Panel (Panel) of a screen has a fixed refresh frequency, during a first Scan signal Scan (0/1) of the Panel, a first Frame (1) of a Graphics Processing Unit (GPU) is displayed on the Panel, and when the Frame (1) has not completely disappeared, a second Frame (2) is output to the Panel for display, at this time, the first Scan signal Scan (0/1) corresponds to the Frame frames (1) and (2), and a point a displays two frames at the same time, but a point a does not reach a first refresh node (16ms) of the Panel, that is, a point a shows Frame tearing. Similarly, the picture tears appear at the b point, the c point and the d point.
3. Picture katton (stilting): because the (game) optimization is not in place or the hardware configuration of the equipment is not in demand, part of links in the (game) picture generation process are slowed down, so that the time node output by the GPU and the refreshing time of the panel are staggered, and the screen is jammed.
FIG. 2 is a diagram illustrating a Frame display process, as shown in FIG. 2, the panel refresh frequency of the screen is fixed, and a first Frame (1) output by the GPU is displayed on the panel during the first Scan signal Scan; when the node is refreshed for 16ms for the first time, the second scanning signal Scan (1) corresponds to the second Frame (2); when the node is refreshed for the second time for 32ms, the GPU does not output a new picture, and time dislocation occurs, so that the picture at the point e is blocked; when the third refresh node reaches 48ms, the third Frame (3) output by the GPU is displayed on the panel.
4. Variable Refresh Rate (VRR): the refreshing frequency of the display screen changes along with the output frequency of the GPU, and the refreshing frequency is mainly used for reducing or eliminating the conditions of picture delay, pause, tearing and the like (in games) and ensuring the display fluency and detail integrity of pictures. The conventional variable refresh rate technology mainly includes FreeSesync (developed by AMD, a well-known company) and Gsync (developed by Nvidia, a well-known company).
FIG. 3 is a schematic diagram illustrating a variable refresh rate, and as shown in FIG. 3, the panel refresh rate of the screen is not a fixed value, but the panel is refreshed after the output Frame of the GPU is refreshed, i.e., the refresh rate of the panel changes with the output rate of the GPU, thereby reducing or eliminating the Frame tearing and the jerky.
5. Backlight adjustment: currently, backlight adjustment of a liquid crystal display screen is usually implemented by digital dimming, that is, adjustment is implemented by adjusting a PWM (Pulse Width Modulation) duty ratio, where the PWM duty ratio is a ratio of a whole period of a high level in a Pulse period. The on-time of the LED backlight lamp in the liquid crystal display screen is adjusted by adjusting the PWM duty ratio, so that the effect of adjusting the screen brightness is achieved.
FIG. 4 is a schematic diagram of backlight adjustment of a liquid crystal display screen, as shown in FIG. 4, the PWM duty ratio corresponds to the screen brightness, for example, when the PWM duty ratio is 1, the screen brightness is 100%; when the PWM duty ratio is 0.5, the screen brightness is 50%; when the PWM duty ratio is 0.25, the screen brightness is 25%, and so on for the other ratios.
6. Water ripple: due to the fact that the refreshing frequency of the liquid crystal display screen and the backlight frequency of the LED backlight lamp are overlapped, screen water ripples appear in a dark field.
For a screen with a fixed refresh frequency, in the debugging process, the backlight frequency is usually adjusted according to the refresh frequency of the screen, that is, a frequency corresponding to the fixed refresh frequency and having no obvious water ripple phenomenon is set as the backlight frequency.
However, for the display screen adopting the variable refresh rate mode, since the refresh frequency of the screen is adjusted in real time, if the fixed backlight frequency is still adopted, the water ripple condition still occurs under the partial refresh frequency.
The application provides a screen backlight frequency adjusting method, which aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 5 is a schematic flow chart of a screen backlight frequency adjustment method in some embodiments of the present application, and as shown in fig. 5, the method is explained by taking an example of the method applied to a processor capable of performing screen backlight frequency adjustment on a display screen, and the method includes the following steps:
s100, acquiring the current refresh frequency of the display screen in the variable refresh rate mode.
The display screen may be a liquid crystal display, and specifically may be a liquid crystal display that supports operation in the variable refresh rate mode.
In addition, the screen backlight frequency adjusting method is used for adjusting the frequency in real time in the screen display process, and the current refreshing frequency is the refreshing frequency of the display screen at the current moment when the display screen works in the variable refreshing rate mode. For example, the current refresh frequency may specifically be 60Hz, 120Hz, or the like.
And S200, determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency.
After the current refresh frequency of the display screen in the variable refresh rate mode is acquired, the processor determines a corresponding backlight frequency target value based on the acquired current refresh frequency so as to adjust the backlight frequency.
To ensure that the display screen does not have water ripples, the target backlight frequency value may be an integer multiple of the current refresh frequency. For example, when the current refresh frequency is 60Hz, the corresponding backlight frequency target value may be 180Hz, etc.
In some embodiments, the backlight frequency target value may also be other multiples of the current refresh frequency, such as 1.5 times, 2.5 times (decimal place is a multiple of 5), and so on. For example, when the current refresh frequency is 90Hz, the corresponding backlight frequency target value may be 225Hz, etc.
And S300, adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
And after determining the backlight frequency target value corresponding to the current refreshing frequency, the processor adjusts the current backlight frequency of the display screen according to the backlight frequency target value. In some embodiments, if the current backlight frequency is consistent with the backlight frequency target value, the current backlight frequency is maintained unchanged; if the current backlight frequency is not consistent with the backlight frequency target value, the current backlight frequency is adjusted to the backlight frequency target value.
The target value of the backlight frequency is the backlight frequency at which the display screen does not have water ripples under the current refreshing frequency, so that the water ripples on the display screen can be avoided by adjusting the current backlight frequency of the display screen.
Some embodiments provide a screen backlight frequency adjusting method, for a display screen with a variable refresh frequency, by acquiring a current refresh frequency of the display screen in a variable refresh rate mode in real time, determining a backlight frequency target value at which a water ripple does not occur on the display screen according to the current refresh frequency, and further adjusting the current backlight frequency of the display screen according to the backlight frequency target value, thereby preventing the water ripple from occurring on the display screen and improving the display quality of the display screen.
Fig. 6 is a schematic flowchart of determining a target backlight frequency value when a display screen is not rippled based on a current refresh frequency in some embodiments of the present application, where as shown in fig. 6, the process flow includes the following steps:
s230, acquiring a preset relation between different refreshing frequencies and different backlight frequencies under the condition that the display screen does not have water ripples;
s240, determining a backlight frequency target value corresponding to the current refresh frequency based on the preset relationship.
In some embodiments, when determining the backlight frequency target value, the processor may first obtain a preset relationship between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen. Therefore, the processor can determine the target value of the backlight frequency corresponding to the current refresh frequency and without water ripples based on the preset relation.
In some embodiments, the processor may analyze the existing frequency data to obtain a preset relationship between different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples. Of course, the preset relationship between the different refresh frequencies and the different backlight frequencies may also be determined in advance and stored in the memory, and when the backlight frequency target value needs to be determined, the processor directly obtains the preset relationship from the memory. Of course, the processor may also obtain the preset relationship between different refresh frequencies and different backlight frequencies from the external device. For example, the preset relationship is stored in the cloud, and when the backlight frequency target value needs to be determined, the processor obtains the preset relationship from the cloud. In addition, the external device may also be an external storage medium or the like, and some embodiments do not limit the manner of acquiring the medical image.
In some embodiments, the processor determines the backlight frequency target value corresponding to the current refresh frequency based on the preset relationship, so that the backlight frequency without water ripples at the current refresh frequency can be obtained quickly and accurately.
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 the display screen does not have water ripples.
In some embodiments, it is defined that Fvrr represents a refresh frequency and Fled represents a backlight frequency, and the corresponding forms of refresh frequency and backlight frequency include point-to-point correspondence, point-to-segment correspondence, segment-to-segment correspondence, and segment-to-segment correspondence.
Where point-to-point correspondence means that a single refresh frequency corresponds to a single backlight frequency, e.g., Fvrri corresponds to Fledi.
The dot-segment correspondence means that a single refresh frequency corresponds to a frequency segment composed of a plurality of backlight frequencies, for example, Fvrri corresponds to Fledm-Fledn.
Segment-point correspondence means that multiple refresh frequencies correspond to a single backlight frequency, e.g., Fvrrm-Fvrrn corresponds to Fledi.
Segment-to-segment correspondence refers to a plurality of refresh frequencies corresponding to a frequency segment consisting of a plurality of backlight frequencies, e.g., Fvrrm-Fvrrn corresponds to Fledm-Fledn.
In practical application, any one or more of the above corresponding forms can be selected according to practical situations. For example, point-point correspondences are used only, or point-point correspondences and segment-point correspondences are used simultaneously, etc.
In some embodiments, the correspondence of the refresh frequency to the backlight frequency may be stored in the form of a table.
For example, tables 1 and 2 are illustrative of point-to-point correspondence, segment-to-point correspondence, respectively.
| Refresh frequency | Frequency of backlight |
| Fvrr1 | Fled1 |
| Fvrr2 | Fled2 |
| … | … |
| Fvrrn | Fledn |
TABLE 1
TABLE 2
In some embodiments, the correspondence between the refresh frequency and the backlight frequency may also be saved in the form of a graph.
For example, FIG. 7 is an exemplary graph of point-to-point correspondence, where a single refresh frequency value corresponds to a single backlight frequency, according to some embodiments of the present application.
For another example, fig. 8 is an exemplary diagram corresponding to segment-points in some embodiments of the present application, wherein a plurality of refresh frequency values correspond to a single backlight frequency.
When the preset relationship includes a corresponding relationship, correspondingly, before acquiring the preset relationship between different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples, the method for adjusting the screen backlight frequency further includes: s210, determining the corresponding relation between different refreshing frequencies and different backlight frequencies under the condition that the display screen does not have water ripples.
When the preset relationship comprises a corresponding relationship, correspondingly determining a backlight frequency target value corresponding to the current refresh frequency, wherein the method comprises the following steps: and searching a backlight frequency target value corresponding to the current refreshing frequency based on the corresponding relation.
Some embodiments can quickly search and determine the backlight frequency target value corresponding to the current refresh frequency by determining the corresponding relationship between different refresh frequencies and different backlight frequencies in advance, thereby facilitating the adjustment of the backlight frequency.
In some embodiments, the preset relationship comprises a relational function, i.e. a calculation formula of the refresh frequency and the backlight frequency under the condition that the display screen does not have water ripples.
In some embodiments, Fvrr and Fled are defined to represent the refresh frequency and backlight frequency, and the calculation formula of the refresh frequency and the backlight frequency can be expressed by a linear formula. For example, Fled ═ K × Fvrr, where K is the coefficient of the relationship between the refresh frequency and the backlight frequency.
In some embodiments, the calculation formula of the refresh frequency and the backlight frequency may also be expressed by other formulas, which are not limited herein.
When the preset relationship includes the relationship function, correspondingly, before acquiring the preset relationship between different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples, the method further includes: s220, determining a relation function of different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples.
When the preset relationship comprises a relationship function, correspondingly determining a backlight frequency target value corresponding to the current refresh frequency, wherein the method comprises the following steps: and calculating a backlight frequency target value corresponding to the current refreshing frequency based on the relation function.
Some embodiments can quickly calculate and determine the backlight frequency target value corresponding to the current refresh frequency by determining a calculation formula of different refresh frequencies and different backlight frequencies in advance, thereby facilitating the adjustment of the backlight frequency.
In some embodiments, the preset relationship includes a correspondence relationship and a relationship function.
In some embodiments, the processor may simultaneously determine the first backlight frequency target value according to the correspondence and the second backlight frequency target value according to the relationship function. After the first backlight frequency target value and the second backlight frequency target value are obtained, a final backlight frequency target value is determined based on the first backlight frequency target value and the second backlight frequency target value.
Further, defining the flad _ tar1 to represent the first backlight frequency target value, the flad _ tar2 to represent the second backlight frequency target value, and the flad _ tar to represent the final backlight frequency target value, wherein determining the final backlight frequency target value based on the first backlight frequency target value and the second backlight frequency target value specifically includes:
if the Fled _ tar1 is Fled _ tar2, then Fled _ tar1 is Fled _ tar 2;
if Fled _ tar1 ≠ Fled _ tar2, then Fled _ tar is determined using any of the following rules:
(1) the current backlight frequency target value is a first backlight frequency target value, and the current backlight frequency target value is a second backlight frequency target value, wherein the current backlight frequency target value is a second backlight frequency target value;
(2) the maximum value of the flad _ tar1 and the flad _ tar2 is flad _ tar [ flad _ tar1, flad _ tar2 ];
(3) the minimum value of the flad _ tar1 and the flad _ tar2 is referred to as flad _ tar [ flad _ tar1, flad _ tar2 ].
It is understood that other rules may be used to determine the Fled _ tar in practical applications.
When the preset relationship includes a corresponding relationship and a relationship function, correspondingly, before acquiring the preset relationship between different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples, the method further includes: s210, determining the corresponding relation between different refreshing frequencies and different backlight frequencies under the condition that the display screen does not have water ripples; s220, determining a relation function of different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples.
When the preset relationship comprises a corresponding relationship and a relationship function, correspondingly determining a backlight frequency target value corresponding to the current refresh frequency, wherein the method comprises the following steps: searching a first backlight frequency target value corresponding to the current refreshing frequency based on the corresponding relation; calculating a second backlight frequency target value corresponding to the current refreshing frequency based on the relation function; the final backlight frequency target value is determined based on the first backlight frequency target value and the second backlight frequency target value.
Some embodiments may improve the accuracy of the backlight frequency target value by determining in advance the corresponding relationship between different refresh frequencies and different backlight frequencies and the calculation formula, and determining the final backlight frequency target value based on the backlight frequency target value obtained from the corresponding relationship and the calculation formula.
In some embodiments, a process flow of determining correspondence between different refresh frequencies and different backlight frequencies under a condition that a display screen does not have water ripples is explained by taking a case that the correspondence is a segment-point correspondence as an example.
Fig. 9 is a schematic diagram of determining correspondence between different refresh frequencies and different backlight frequencies according to some embodiments of the present application, and as shown in fig. 9, the processing flow includes the following steps:
s211, acquiring a first frequency range corresponding to the refresh frequency and a second frequency range corresponding to the backlight frequency;
s212, selecting a first refresh frequency in a first frequency range as an initial frequency;
s213, selecting a first corresponding backlight frequency which does not have water ripples on the display screen when the refresh frequency is the starting frequency from the second frequency range;
s214, adjusting the refreshing frequency according to a frequency change sequence of the refreshing frequency, wherein the frequency change sequence comprises a change from a maximum value to a minimum value in the first frequency range and/or a change from the minimum value to the maximum value in the first frequency range;
s215, determining a second refresh frequency of the display screen with water ripples under the first corresponding backlight frequency, and determining a previous adjusting frequency of the second refresh frequency as an end frequency corresponding to the start frequency;
s216, determining the backlight frequency corresponding to the refresh frequency in the range from the starting frequency to the ending frequency as a first corresponding backlight frequency;
and S217, taking the second refresh frequency as a new initial frequency, and returning to the step of selecting a new first corresponding backlight frequency, in which no water ripples appear on the display screen, from the second frequency range until all refresh frequencies in the first frequency range have corresponding backlight frequencies, so as to obtain the corresponding relationship between different refresh frequencies and different backlight frequencies.
The first frequency range corresponding to the refresh frequency may be 42Hz to 244Hz, and the second frequency range corresponding to the backlight frequency may be 0Hz to 1 kHz. It will be appreciated that the frequency range may be adjusted based on the actual circumstances.
In some embodiments, taking the first refresh frequency as the minimum value in the first frequency range (i.e. 42Hz) as an example, 42Hz is first selected as the starting frequency, and a first corresponding backlight frequency at which the display screen does not appear to be rippled, for example 126Hz, is determined at the refresh frequency of 42 Hz.
The refresh rate is then adjusted in order of change (i.e., from small to large) to 244Hz, e.g., 43Hz, 44Hz, etc., and the adjustment amplitude may be selected to be 1Hz or other amplitude.
Meanwhile, when the backlight frequency is the first corresponding backlight frequency 126Hz, after the refresh frequency is adjusted, it is determined whether the display screen has water ripples, and the refresh frequency when the water ripples occur is determined to be a second refresh frequency, for example, the second refresh frequency is 51Hz, that is, the water ripples occur when the refresh frequency is adjusted to 51 Hz. At this time, the previous adjustment frequency 50Hz of 51Hz is determined as the ending frequency corresponding to 42Hz, and the backlight frequency corresponding to the refresh frequency within the range from the first starting frequency 42Hz to the first ending frequency 50Hz is determined as the first corresponding backlight frequency 126 Hz.
Then, 51Hz is used as a new starting frequency (i.e. a second starting frequency), and the above process is repeated until the backlight frequencies corresponding to all the refresh frequencies are obtained.
In some embodiments, the first refresh frequency may also be the maximum value in the first frequency range (i.e., 244Hz), and correspondingly, the frequency change sequence is to change to 42Hz, i.e., from large to small. Other processing steps have the same principle and are not described in detail herein.
In some embodiments, the first refresh frequency may also be a middle value (e.g. 100Hz) in the first frequency range, and correspondingly, the frequency change sequence includes a change from 100Hz to 42Hz and a change from 100Hz to 244Hz, i.e. both a change from large to small and a change from small to large. Other processing steps have the same principle and are not described in detail herein.
After obtaining the backlight frequencies corresponding to all the refresh frequencies in the first frequency range, the corresponding relationship between the refresh frequencies and the backlight frequencies can be saved in the form of a table and/or a coordinate graph.
In some embodiments, a process flow of determining a relationship function between different refresh frequencies and different backlight frequencies under the condition that no water ripples appear on the display screen is explained by taking a case that the relationship function is a linear relationship as an example.
FIG. 10 is a schematic diagram of determining a function of different refresh frequencies versus different backlight frequencies according to some embodiments of the present application, and as shown in FIG. 10, the process flow includes the following steps:
s221, acquiring a first frequency range corresponding to the refreshing frequency and a second frequency range corresponding to the backlight frequency;
s222, selecting a third refresh frequency from the first frequency range;
s223, selecting a second corresponding backlight frequency from the second frequency range, wherein when the refresh frequency is the third refresh frequency, the display screen does not have water ripples;
s224, based on the proportional relationship between the third refresh frequency and the second corresponding backlight frequency, determining a relationship function between different refresh frequencies and different backlight frequencies.
The first frequency range corresponding to the refresh frequency may be 42Hz to 244Hz, and the second frequency range corresponding to the backlight frequency may be 0Hz to 1 kHz. It will be appreciated that the frequency range may be adjusted based on the actual circumstances.
Based on the characteristics of frequency interference, when two frequencies change in equal proportion, the frequency with interference effect changes, but the interference effect does not change. Therefore, the corresponding second corresponding backlight frequency can be determined based on any frequency value in the first frequency range, so that a linear relation function of the refresh frequency and the backlight frequency is obtained.
In some embodiments, taking the third refresh frequency as 60Hz in the first frequency range as an example, a second corresponding backlight frequency, such as 120Hz, at which no water ripple appears on the display screen when the refresh frequency is 60Hz, is first determined.
And then, determining a relation function of different refresh frequencies and different backlight frequencies based on a proportional relation between the third refresh frequency 60Hz and the second corresponding backlight frequency 120Hz, and obtaining a K value in the Fled K Fvrr. For example, K-120/60-2.
Finally, the relation function of the different refresh frequencies and the different backlight frequencies is determined to be Fled 2 Fvrr.
In some embodiments, when selecting the second corresponding backlight frequency from the second frequency range, there may be a plurality of second corresponding backlight frequencies, for example, when the refresh frequency is 60Hz, the backlight frequencies are 90Hz, 120Hz, 150Hz, 180Hz, and 210Hz, and no water ripple occurs, and then a plurality of Ki may be determined based on the plurality of second corresponding backlight frequencies, for example, K1, K2, …, Kn, etc., and then a final K value may be determined based on the plurality of Ki.
In some embodiments, determining the final value of K based on multiple Ki may be determined by the following rule:
wherein p is a multiplying factor constant, and p is greater than or equal to 2.
For example, when the value of p is 2, a plurality of K values, 1.5, 2, 2.5, 3, and 3.5 respectively, can be obtained based on the refresh frequency of 60Hz and the plurality of backlight frequencies of 90Hz, 120Hz, 150Hz, 180Hz, and 210Hz, and finally K can be determined to be 2 based on the above rule.
In some embodiments, the backlight frequency is an adjusted frequency of a backlight PWM signal of a light emitting diode in the display screen. The light emitting diode LED is a backlight LED in the liquid crystal display screen.
In some embodiments, after the processor calculates the backlight frequency target value, the processor directly outputs a corresponding control signal to a backlight driving module in the display screen in a PWM waveform form, and after receiving the PWM signal sent by the processor, the backlight driving module amplifies the PWM signal and outputs a backlight driving signal, where the backlight driving signal is used to drive a backlight LED. Therefore, the backlight PWM signal adjusting frequency of the backlight LED is adjusted to be adaptive to the refreshing frequency of the display screen, so that the water ripple caused by the overlapping of the two frequencies can be avoided, and the display quality of the screen is improved.
In some embodiments, an application scenario of the screen backlight frequency adjustment method of the present application is explained.
Fig. 11 is a diagram of an application scenario of a screen backlight frequency adjustment method according to some embodiments of the present application, as shown in fig. 11, the application scenario mainly includes:
(1) acquiring a video stream to be played, and performing video decoding and other processing;
(2) performing image quality optimization and other processing on the display content of the video, specifically including gray consistency adjustment, brightness adjustment, adjustment of hue, saturation, concentration, dynamic contrast, GAMMA curve and the like, so as to improve the display effect;
(3) packaging, converting format and the like the processed data, and outputting the video stream to a liquid crystal panel;
(4) monitoring the current refreshing frequency of the video stream of the liquid crystal panel with the output value;
(5) determining a corresponding backlight frequency target value by adopting the screen backlight frequency adjusting method based on the monitored current refreshing frequency;
(6) outputting corresponding control signals to a backlight driving module in a PWM waveform form;
(7) the backlight driving module amplifies the received PWM signal and outputs a backlight driving signal, thereby driving the backlight LED.
In some embodiments, in the above processing procedure, the functions of steps (1) to (6) may all be implemented by an SOC (System on Chip), where the SOC is a System-level Chip and includes a built-in RAM (Random Access Memory), a ROM (Read-Only Memory), and a System-level code, that is, an operating System may be run.
In some embodiments, the brightness adjustment of the backlight LED is implemented by PWM duty cycle adjustment.
Fig. 12 is a schematic Circuit diagram of PWM duty ratio adjustment in some embodiments of the present application, and as shown in fig. 12, the SOC sends a PWM signal to a backlight driver IC (Integrated Circuit Chip), and the backlight driver IC performs driving capability enhancement on the PWM signal through a DRV port to obtain a PWM pulse driving signal and outputs the PWM pulse driving signal to a backlight LED.
The PWM pulse driving signal is generated according to two parameters of backlight frequency and duty ratio, wherein the frequency parameter is a corresponding backlight frequency target value determined by adopting the screen backlight frequency adjusting method of the application and is used for adjusting the backlight frequency; the duty ratio parameter is used for adjusting the duty ratio of the duration of the high level in one change period of the PWM signal, the duty ratio parameter and the duration of the high level are in positive correlation, and the duty ratio parameter is determined according to the brightness of the image corresponding to the backlight source. The PWM pulse driving signal is used to adjust the brightness of the backlight LED.
In addition, the backlight driving IC collects current through the ISEN port, and transmits a voltage control signal to the LED voltage control system through the FB port based on the current collection result, thereby controlling the supply voltage V0 of the backlight LED.
It should be understood that, although the respective steps in the flowcharts in the above-described embodiments are sequentially shown as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.
Fig. 13 is a schematic structural diagram of a screen backlight frequency adjusting apparatus according to some embodiments of the present application, as shown in fig. 13, the apparatus includes:
a refresh frequency obtaining module 100, configured to obtain a current refresh frequency of a display screen in a variable refresh rate mode;
a backlight frequency determining module 200, configured to determine a backlight frequency target value when the display screen does not have water ripples based on the current refresh frequency;
the backlight frequency adjusting module 300 is configured to adjust a current backlight frequency of the display screen according to the backlight frequency target value.
Some embodiments provide a screen backlight frequency adjusting apparatus, for a display screen with a variable refresh frequency, obtaining a current refresh frequency of the display screen in a variable refresh rate mode in real time, determining a backlight frequency target value at which a water ripple does not occur on the display screen according to the current refresh frequency, and further adjusting the current backlight frequency of the display screen according to the backlight frequency target value, so as to avoid the water ripple occurring on the display screen and improve the display quality of the display screen.
For specific limitations of the screen backlight frequency adjusting apparatus, reference may be made to the above limitations of the screen backlight frequency adjusting method, which are not described herein again. The modules in the screen backlight frequency adjusting device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the electronic device, or can be stored in a memory in the electronic device in a software form, so that the processor can call and execute operations corresponding to the modules.
In some embodiments, there is provided a screen backlight frequency adjusting apparatus, including: a memory, a processor; a memory; a memory for storing processor-executable instructions; wherein the processor is configured to: acquiring the current refresh frequency of a display screen in a variable refresh rate mode; determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency; and adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
In some embodiments, a computer-readable storage medium is provided, in which computer-executable instructions are stored, and when executed by a processor, the computer-executable instructions are used for implementing the screen backlight frequency adjustment method in the above embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can 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, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for adjusting the backlight frequency of a screen, comprising:
acquiring the current refresh frequency of a display screen in a variable refresh rate mode;
determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency;
and adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
2. The method of claim 1, wherein determining the target backlight frequency value when the display screen is not rippled based on the current refresh frequency comprises:
acquiring a preset relation between different refreshing frequencies and different backlight frequencies under the condition that a display screen does not have water ripples;
and determining the backlight frequency target value corresponding to the current refresh frequency based on the preset relation.
3. The method according to claim 2, wherein the preset relationship comprises a correspondence relationship and/or a relationship function;
the obtaining, under the condition that the display screen does not have water ripples, before the preset relationship between different refresh frequencies and different backlight frequencies, further includes:
determining the corresponding relation between different refreshing frequencies and different backlight frequencies under the condition that the display screen does not have water ripples; and/or the presence of a gas in the gas,
and determining the relation function of different refresh frequencies and different backlight frequencies under the condition that the display screen does not have water ripples.
4. The method of claim 3, wherein the determining the correspondence between different refresh frequencies and different backlight frequencies without moire on the display screen comprises:
acquiring a first frequency range corresponding to a refreshing frequency and a second frequency range corresponding to a backlight frequency;
selecting a first refresh frequency within the first frequency range as a start frequency;
selecting a first corresponding backlight frequency from the second frequency range, wherein when the refresh frequency is the starting frequency, the display screen does not have water ripples;
adjusting the refresh frequency in a frequency change sequence of the refresh frequency, the frequency change sequence comprising a change from a maximum value to a minimum value in the first frequency range and/or a change from a minimum value to a maximum value in the first frequency range;
determining a second refresh frequency of a display screen with water ripples under the first corresponding backlight frequency, and determining a previous adjusting frequency of the second refresh frequency as an ending frequency corresponding to the starting frequency;
determining a backlight frequency corresponding to a refresh frequency in a range from the starting frequency to the ending frequency as the first corresponding backlight frequency;
and taking the second refreshing frequency as a new initial frequency, and returning to the step of selecting a new first corresponding backlight frequency from the second frequency range, wherein when the refreshing frequency is the new initial frequency, no water ripples appear on the display screen, until all the refreshing frequencies in the first frequency range have corresponding backlight frequencies, so as to obtain the corresponding relation between different refreshing frequencies and different backlight frequencies.
5. The method of claim 3, wherein determining the function of the different refresh rates as a function of the different backlight rates without moire on the display screen comprises:
acquiring a first frequency range corresponding to a refreshing frequency and a second frequency range corresponding to a backlight frequency;
selecting a third refresh frequency from the first frequency range;
selecting a second corresponding backlight frequency from the second frequency range, wherein when the refresh frequency is the third refresh frequency, the display screen does not have water ripples;
and determining a relation function of the different refresh frequencies and the different backlight frequencies based on the proportional relation between the third refresh frequency and the second corresponding backlight frequency.
6. The method according to claim 3, wherein the determining a backlight frequency target value corresponding to the current refresh frequency based on the preset relationship comprises:
searching a backlight frequency target value corresponding to the current refreshing frequency based on the corresponding relation; and/or the presence of a gas in the gas,
and calculating a backlight frequency target value corresponding to the current refreshing frequency based on the relation function.
7. The method according to any of claims 1-6, wherein the backlight frequency is an adjusted frequency of a backlight PWM signal of light emitting diodes in the display screen.
8. A screen backlight frequency adjustment apparatus, comprising:
the refresh frequency acquisition module is used for acquiring the current refresh frequency of the display screen in a variable refresh rate mode;
the backlight frequency determining module is used for determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency;
and the backlight frequency adjusting module is used for adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
9. A screen backlight frequency adjustment apparatus, comprising: a memory, a processor;
a memory; a memory for storing the processor-executable instructions;
wherein the processor is configured to: acquiring the current refresh frequency of a display screen in a variable refresh rate mode; determining a backlight frequency target value when the display screen does not have water ripples based on the current refreshing frequency; and adjusting the current backlight frequency of the display screen according to the backlight frequency target value.
10. A computer-readable storage medium having computer-executable instructions stored therein, which when executed by a processor, are configured to implement the screen backlight frequency adjustment method according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010455268.XA CN113724656A (en) | 2020-05-26 | 2020-05-26 | Screen backlight frequency adjusting method, device, equipment and storage medium |
| PCT/CN2021/081917 WO2021238362A1 (en) | 2020-05-26 | 2021-03-19 | Display apparatus |
| PCT/CN2021/081883 WO2021238361A1 (en) | 2020-05-26 | 2021-03-19 | Display device and display control method |
| US17/808,041 US11830446B2 (en) | 2020-05-26 | 2022-06-21 | Display apparatus and display control method |
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| CN202010455268.XA CN113724656A (en) | 2020-05-26 | 2020-05-26 | Screen backlight frequency adjusting method, device, equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114724528A (en) * | 2022-04-02 | 2022-07-08 | 深圳创维－Rgb电子有限公司 | Display control method and device of display equipment, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114724528A (en) * | 2022-04-02 | 2022-07-08 | 深圳创维－Rgb电子有限公司 | Display control method and device of display equipment, electronic equipment and storage medium |
| CN114724528B (en) * | 2022-04-02 | 2024-03-22 | 深圳创维－Rgb电子有限公司 | Display control method and device of display device, electronic device and storage medium |
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