CN112992043B - Display screen brightness adjusting method and display screen brightness adjusting system - Google Patents
Display screen brightness adjusting method and display screen brightness adjusting system Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G2320/0626—Adjustment of display parameters for control of overall brightness
Abstract
A display screen brightness adjusting method with low bias loss of gray tone and a display screen brightness adjusting system with low bias loss of gray tone are provided, the display screen brightness adjusting method comprises the following steps: dividing the change range of the brightness adjustment of the display screen into at least two brightness intervals; setting corresponding current coefficients of each grade with the same color tone according to each grade of brightness interval by adopting light measuring instrument equipment; dividing the variation range of the brightness in each grade of brightness interval into at least two grades of brightness sections; according to the corresponding relation between the brightness interval and the current coefficient, combining the gear of the brightness interval where the brightness value to be controlled is located, and determining a preset current coefficient of the brightness interval; obtaining preset duty ratio coefficients of brightness values of all levels in each brightness interval according to the brightness section where the brightness value to be controlled is located in the corresponding brightness interval; performing pulse width modulation dimming according to a preset current coefficient and a preset duty ratio coefficient; the embodiment can reduce the gray tone bias loss of the display screen in low brightness and avoid the image quality damage in low brightness.
Description
Technical Field
The application belongs to the technical field of light source control, and particularly relates to a display screen brightness adjusting method with low offset loss of gray tone and a display screen brightness adjusting system with low offset loss of gray tone.
Background
With the rapid development of modern industrial technologies, LED (Light Emitting Diode) display screens are gradually widely used in various industrial technical fields, wherein the LED display screens are not only low in manufacturing cost and easy to manufacture, but also can emit Light sources with various brightness and colors according to the actual requirements of industrial environments; therefore, the LED display screen has higher practical value and can meet different visual appreciation requirements of people; and 24 hours and various weather changes all day will produce different sunshine environment, need carry out real-time brightness control through the light source display state to the LED display screen to adapt to different environment.
However, in the process of adjusting the brightness of the LED display screen in the conventional technology, the gray scale number of the LED display screen is seriously lost in the conventional manner when the brightness is low at night; especially, in a video display environment with a high brightness difference of the LED display screen, the loss of the gray scale and the tone of the LED display screen is more serious; in the process of dynamically scanning the display screen, time interval errors will occur between different scanning periods, large gray scale loss will occur, and the display image quality of the LED display screen is greatly damaged.
Disclosure of Invention
In view of this, embodiments of the present application provide a method for adjusting brightness of a display screen with low offset loss of gray tone, a display screen, and a computer-readable storage medium, which are used to solve the problems that in the process of adjusting the brightness of the display screen in the conventional technical solution, the gray level number is seriously lost in a low-brightness area, the display quality of the display screen is damaged, and the visual experience of a user is poor.
A first aspect of an embodiment of the present application provides a method for adjusting brightness of a display screen with low offset loss of gray tone, including:
obtaining the change range of the luminous brightness of the display screen, and dividing the change range into at least two ranges of brightness intervals;
setting a current coefficient according to each brightness interval by adopting photometric equipment, wherein each brightness interval corresponds to each current coefficient one by one;
dividing each grade of the brightness interval into at least two levels of brightness sections, wherein each level of the brightness sections respectively correspond to a duty ratio coefficient;
acquiring a brightness value to be controlled, and determining a gear of a brightness interval where the brightness value to be controlled is located and the stage number of a brightness section where the brightness value to be controlled is located;
obtaining corresponding preset current coefficients according to the one-to-one correspondence relationship between each brightness interval and each current coefficient;
obtaining corresponding preset duty ratio coefficients according to the one-to-one correspondence relationship between each level of the brightness sections and each duty ratio coefficient;
and generating a brightness adjusting instruction according to the preset current coefficient and the preset duty ratio coefficient, and outputting the brightness adjusting instruction to the display screen so as to perform pulse width modulation dimming on the display screen and realize brightness adjustment of the display screen.
In one embodiment, after dividing each brightness interval into at least two brightness sections, the display screen brightness adjusting method further includes:
acquiring a duty ratio variation range corresponding to the brightness interval;
counting the number of levels of a brightness section in the brightness interval;
and obtaining a duty ratio coefficient corresponding to the brightness section according to the number of stages of the brightness section in the brightness interval and the corresponding duty ratio change range.
In one embodiment, obtaining the duty ratio coefficient corresponding to the luminance section according to the number of levels of the luminance section in the luminance section and the corresponding duty ratio variation range specifically includes:
dividing the corresponding duty ratio variation range into at least two levels of duty ratio sections, wherein each level of brightness section in the brightness interval is arranged corresponding to each level of duty ratio section in the corresponding duty ratio variation range;
and in each duty cycle section, selecting a duty cycle value in the duty cycle section as a duty cycle coefficient of the corresponding brightness section.
In one embodiment, the variation range is divided into at least two brightness intervals, specifically:
determining the number of gears to be controlled, and dividing the change range into at least two brightness intervals according to the number of gears to be controlled.
In one embodiment, the setting, by the light meter device, a current coefficient according to each shift of the brightness interval specifically includes:
setting a duty ratio parameter, a white balance color temperature and a preset brightness value of each brightness interval;
and acquiring a corresponding current coefficient by adopting the photometric instrument according to the duty ratio parameter, the white balance color temperature and the preset brightness value of each brightness interval.
In one embodiment, the duty ratio parameter of the luminance interval is greater than 0.9 and less than or equal to 1.
In one embodiment, the duty cycle parameter of the luminance interval is set to 1.
In one embodiment, the preset brightness value of the brightness interval is: the maximum light emission luminance in the luminance section.
In one embodiment, the generating a brightness adjustment instruction according to the preset current coefficient and the preset duty ratio coefficient specifically includes:
generating the brightness adjusting instruction according to the preset current coefficient and the preset duty ratio coefficient, wherein the brightness adjusting instruction comprises: the method comprises the steps of instructing a packet header, a brightness duty ratio coefficient and a display screen current coefficient;
the display screen current coefficient is equal to a preset current coefficient, and the brightness duty ratio coefficient is equal to a preset duty ratio coefficient.
A second aspect of the embodiments of the present application provides a display screen brightness adjusting system with low offset loss of gray tone, including:
the interval division module is used for acquiring the change range of the luminous brightness of the display screen and dividing the change range into at least two brightness intervals;
the current setting module is used for setting a current coefficient according to each brightness interval by adopting light measuring instrument equipment, and each brightness interval corresponds to each current coefficient one by one;
the section dividing module is used for dividing each grade of the brightness interval into at least two levels of brightness sections, and each level of the brightness sections respectively correspond to a duty ratio coefficient;
the gear determining module is used for acquiring a brightness value to be controlled, and determining the gear of a brightness interval where the brightness value to be controlled is located and the stage number of a brightness section where the brightness value to be controlled is located;
the current acquisition module is used for acquiring corresponding preset current coefficients according to the one-to-one correspondence relationship between each brightness interval and each current coefficient;
the duty ratio obtaining module is used for obtaining corresponding preset duty ratio coefficients according to the one-to-one correspondence relationship between each level of the brightness section and each duty ratio coefficient;
and the PWM dimming module is used for generating a brightness adjusting instruction according to the preset current coefficient and the preset duty ratio coefficient, and outputting the brightness adjusting instruction to the display screen so as to perform pulse width modulation dimming on the display screen and realize brightness adjustment of the display screen.
The brightness adjusting method of the display screen with the gray tone and the low bias loss divides the variation range of the brightness of the display screen into the brightness intervals of different grades, then uses the light measuring instrument equipment to set the current coefficient corresponding to the brightness interval of each grade in advance, the current coefficient value ensures that the tone and the color temperature presented by each grade are consistent (such as within the deviation range of the white-level color temperature 250), and divides the variation range of the brightness in each grade of the brightness interval into the multi-grade brightness sections, so that the variation condition of the brightness in the brightness interval is more finely distinguished according to the brightness sections; in the process of adjusting the brightness of the display screen, according to the multi-level brightness intervals and the multi-level brightness sections in each level of brightness intervals, a preset duty ratio coefficient and a preset current coefficient can be accurately determined according to the brightness value to be controlled, so that flexible pulse width modulation dimming of the display screen is realized; therefore, in the embodiment, the luminance of the display screen is divided into the luminance intervals of different levels in advance, the luminance of the display screen is adjusted and converted into the luminance intervals of different levels, and the duty ratio coefficient is prevented from being in an excessively small state by changing the corresponding current coefficient and the duty ratio coefficient, so that the gray tone offset loss phenomenon of the display screen at low luminance is reduced, and the image quality of the display screen is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for adjusting brightness of a display panel with low offset loss of gray tones according to an embodiment of the present disclosure;
FIG. 2 is a flowchart illustrating another embodiment of a method for adjusting brightness of a display panel with low offset loss of gray tones;
FIG. 3 is a flowchart illustrating a method S206 for adjusting the brightness of the display panel with low offset loss of gray tones shown in FIG. 2;
FIG. 4 is a diagram illustrating a variation range of light-emitting brightness of a display panel according to an embodiment of the present disclosure;
fig. 5 is a schematic distribution diagram of multi-level luminance sections in a luminance interval a according to an embodiment of the present application;
FIG. 6 is a flowchart illustrating a method S102 for adjusting the brightness of the display panel with low loss of gray tones shown in FIG. 1;
fig. 7 is a schematic structural diagram of a display screen brightness adjustment system with low offset loss of gray tones according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, herein, the color temperature refers to: heating an absolute black body to a certain temperature, wherein the color of light emitted by the absolute black body is the same as that of a light source to be measured, and the temperature heated by the black body is the color temperature of the light source to be measured; the color tone means: the general tendency of the color of one picture of the display screen; the number of gray levels is: the brightness difference of the display pixel points in the display screen is displayed, and when the gray level number of the display screen is more, the image level of the display screen is clearer and more vivid, and the video display quality of the display screen is better; therefore, when the gray scale of the display screen is lost, the picture of the display screen will be distorted to a certain extent, and the duty ratio coefficient (1-0.0000x) controls the ratio of the LED power-on time length, wherein 1 is 100%, 0.1 is 10%, and the duty ratio coefficient 0.5 is nearly 5 times of the brightness of the duty ratio coefficient 0.1.
It should be noted that, the numerical ranges H1-H2 are referred to herein, wherein H1 and H2 are real numbers, and "H1-H2" represents: greater than H1 and less than or equal to H2, e.g., "025-0.5" means greater than 0.25 and less than or equal to 0.5.
For better demonstration of the present embodiment, the video scanning principle of the display screen will be briefly explained below; it should be noted that the demonstration part of the video scanning principle in the following is only used to explain the content of the present embodiment, and these texts are not meant to belong to the prior art; the video scanning principle of the display screen is as follows:
for example, setting the color depth of an image of a display screen to be 24bit color, the monochrome depth to be not less than 14bit color, 8 minutes of scanning, the scanning frequency to be 2000Hz, and the gamma to be 2.0 in the process of scanning pixels of the display screen; the variation range of the light emission luminance is: 1% -100%, wherein when the brightness of the light is 100%, the brightness of the display screen is 100% of the preset highest brightness; the method comprises the steps of adjusting the brightness of the display screen by changing the duty ratio of input current of the display screen; for example, when the current duty ratio coefficient of the display screen is 0.1-1, the display screen emits light sources with different brightness and colors.
In this embodiment, the duty ratio of the input current of the display screen is changed by setting a brightness adjustment command, where the brightness adjustment command is composed of: the instruction packet header, the duty ratio coefficient, the current coefficient and the instruction end, so that the brightness of the display screen can be adjusted in real time through the brightness adjusting instruction, so that the display screen can present different brightness exemplarily, in a 256-gray-scale image, under different duty ratio times, table 1 shows that in each scanning process of the embodiment, the pixel on-state time of the display screen is obtained.
TABLE 1 Pixel on-time in display Panel
As can be seen from the data in table 1, when the luminance of the display screen is 25% of the preset maximum luminance, the duty ratio coefficient is 0.25, a large number of different-level image values with the same power-on time appear below the 32 th-level image value, the gray level number is lost, and the lower the duty ratio coefficient is, the more serious the duty ratio is, the serious the display quality is damaged; the display screen brightness adjusting method with low offset loss of gray tone is provided based on the embodiment of the application, and the offset loss of the gray level number of the display screen can be reduced; referring to fig. 1, for convenience of description, only the portions related to the present embodiment are shown, and the detailed description is as follows, in which the method for adjusting the brightness of the display screen specifically includes:
s101: the method comprises the steps of obtaining the change range of the luminous brightness of the display screen, and dividing the change range into at least two ranges of brightness intervals.
The luminance of the display screen can fluctuate within a certain range, and is represented by 100% as an example: the luminous brightness of the display screen is 100% of the preset maximum brightness, and is represented by 1%: the brightness of the display screen is 1% of the preset maximum brightness, the brightness change range is set to be 100 grade, namely 1%. 2%. 3%. 100%, then the brightness of the display screen is: greater than or equal to 1% and less than or equal to 100%, therefore the luminous brightness of the display screen realizes 100-level adjustment and change of the change range within 1% -100% of the change range, so as to meet the actual visual demand of the user; in the embodiment, the variation range of the luminance is divided into multi-level luminance intervals, the continuous variation value of the luminance of the display screen is integrated in each level of luminance interval, and then the luminance of the display screen is divided into a plurality of levels, so that the display screens with different luminance can be distinguished and adaptively adjusted.
S102: and setting a current coefficient according to each brightness interval by adopting photometric equipment, wherein each brightness interval corresponds to each current coefficient one by one.
Specifically, the light measuring instrument has the functions of image storage, light source detection, test and the like; using a light measuring instrument device to obtain a white balance picture, wherein the duty ratio coefficient is 1, the RGB current coefficient is used for obtaining and finely adjusting the maximum value to meet the target color temperature, and the highest brightness value is obtained, for example, the 1 st highest brightness value is 1000 candela; the duty ratio coefficient is 1, the fine tuning current coefficient is reduced, the measured brightness value is about half of the highest brightness value, for example, the 2 nd highest brightness value is 480 candela; analogizing the current coefficient of the 3 rd gear and the 4 th gear; therefore, the current coefficient corresponding to each brightness interval can be efficiently examined through the light measuring instrument, and the brightness adjusting speed of the display screen is accelerated.
S103: and dividing each grade of brightness interval into at least two levels of brightness sections, wherein each level of brightness section corresponds to a duty ratio coefficient.
Each level of brightness interval comprises continuously-changed luminous intensity, specifically, the brightness interval is divided into at least two levels of brightness sections according to the change range of the luminous brightness in each level of brightness interval, and each level of brightness section has a corresponding duty ratio coefficient, as described above, the 1 level of highest brightness value is 1000 candela, and the 2 level of highest brightness value is 480 candela, that is, the 1 level of brightness interval is divided into 52 levels of brightness sections, each level of brightness section respectively corresponds to a duty ratio coefficient of 0.49.. 0.98, 0.99, 1, which is respectively corresponding to 49%. 98%, 99%, 100%, which is a 52 level of brightness section; the 2-level brightness interval is divided into 48-level brightness sections, preset current coefficients of the 2 nd-level brightness interval are taken, each level of brightness section respectively corresponds to a duty ratio coefficient arithmetic to obtain 48-level brightness ranges of 0.01/0.480.. 0.46/0.48.. 47/0.48.. corresponding to 1%. 46.. 47%, 48%, and so on, then the brightness interval contains the brightness of a specific change range, and in each brightness, more accurate duty ratio coefficient adjustment can be carried out on the display screen, so that the brightness adjustment quality of the display screen is improved.
S104: and acquiring a brightness value to be controlled, and determining the gear of a brightness interval where the brightness value to be controlled is located and the stage number of a brightness section where the brightness value to be controlled is located.
Optionally, the brightness value to be controlled is the brightness that needs to be adjusted by the user, and illustratively, the brightness value to be controlled is obtained according to the control information output by the user; then according to the gear of the change range determined in the S101, attributing the brightness value to be controlled to a brightness interval of a specific gear, and attributing the brightness value to be controlled to a specific brightness section in the corresponding brightness interval; for example, the brightness value to be controlled is 95%, the brightness value to be controlled is located in a brightness interval of 50% to 100%, and a 50-level brightness section exists in the brightness interval: 99-100% of …% of 98-99%; and then the brightness interval of a specific gear is searched for the brightness value to be controlled, so that the brightness of the display screen can be efficiently adjusted.
S105: and obtaining a corresponding preset current coefficient according to the one-to-one correspondence relationship between each grade of brightness interval and each current coefficient.
And then, according to the preset current coefficient, the current coefficient corresponding to the brightness interval in which the brightness value to be controlled is located can be obtained, namely, the preset current coefficient.
S106: and obtaining corresponding preset duty ratio coefficients according to the one-to-one correspondence relationship between each level of brightness section and each duty ratio coefficient.
In each brightness interval, the brightness interval comprises at least two continuous brightness sections, wherein each brightness section is correspondingly provided with a duty ratio coefficient, and then the duty ratio can be uniformly set for all the luminous brightness in the brightness section according to the duty ratio coefficient so as to change the input current of the display screen; therefore, in this embodiment, first, a luminance interval in which the luminance value to be controlled is located is determined to obtain a preset current coefficient; then, the brightness section of the brightness value to be controlled in the corresponding brightness interval is determined to obtain the preset duty ratio coefficient, and the coefficient setting process is simple, convenient and flexible.
S107: and generating a brightness adjusting instruction according to the preset current coefficient and the preset duty ratio coefficient, and outputting the brightness adjusting instruction to the display screen so as to perform Pulse Width Modulation (PWM) dimming on the display screen, thereby realizing the brightness adjustment of the display screen.
It should be noted that the PWM dimming specifically includes changing a ratio between on-time and off-time of the display screen by changing a duty ratio of an input current of the display screen, so as to change the input current of the display screen, thereby achieving a dimming effect; therefore, the brightness adjusting instruction can be set according to the amplitude values of the preset current coefficient and the preset duty ratio coefficient so as to realize the flexible adjusting function of the brightness of the display screen, and the display screen can emit the light source under the driving of the electric energy with the specific pulse width, so that the actual visual and ornamental requirements of users are met.
In a specific flow of the display screen brightness adjusting method shown in fig. 1, a fluctuation range of the brightness of the display screen is divided into multiple levels in advance to obtain multiple levels of brightness intervals, and then multiple levels of brightness sections in each level of brightness interval are obtained according to the brightness change condition in each level of brightness interval; in the process of adjusting the brightness of the display screen, firstly, acquiring a brightness value to be controlled required by a user, determining a gear of a brightness interval in which the brightness value to be controlled is located and the stage number of the brightness interval, further determining various parameters in the process of adjusting the brightness of the display screen, and completing PWM dimming of the display screen; therefore, the preset duty ratio coefficient and the preset current coefficient are set in advance in the embodiment, so that no matter what kind of change occurs to the brightness adjusted by the user, the corresponding PWM dimming parameter can be found in the interval, thereby reducing the phenomenon of gray level number loss of the display screen, particularly, under the low-brightness environment of the display screen, obviously inhibiting the phenomenon of gray level and color tone loss, and solving the problem of the traditional technology that the picture quality of the display screen is damaged in the process of adjusting the picture image of the display screen.
As an optional implementation manner, fig. 2 shows another implementation flow of the display screen brightness adjusting method provided in this embodiment, and compared with the implementation flow of the display screen brightness adjusting method in fig. 1, in fig. 2, after dividing each range of brightness interval into at least two levels of brightness sections, the display screen brightness adjusting method further includes:
s204: and acquiring the duty ratio change range corresponding to the brightness interval.
Illustratively, the duty cycle variation range is: 0.51-1, then, in the embodiment, a duty ratio variation range is set through the light-emitting brightness in each shift of brightness interval, and then, for all the light-emitting brightness in the same brightness interval, each duty ratio in the corresponding duty ratio variation range can be adopted to realize PWM dimming; and according to the corresponding relation between each brightness interval and each duty ratio change range, parameters in the PWM dimming process of the display screen are more simply, conveniently and accurately acquired.
S205: and counting the number of levels of the brightness section in the brightness interval.
Because the luminance interval is divided into the multi-level luminance sections according to the fluctuation range of the luminance brightness in each level of luminance interval, for example, the luminance interval is 50% -100%, the variation range of the luminance brightness in the luminance interval is equally divided into the 50-level luminance sections, and then the 50-level luminance sections are sequentially: 99-100%, 98-99% and …; therefore, through all the brightness sections contained in the brightness interval, the self-adaption and accurate brightness adjustment of each type of the brightness in the brightness interval is realized.
S206: and obtaining the duty ratio coefficient corresponding to the brightness section according to the number of stages of the brightness section in the brightness section and the corresponding duty ratio change range.
Because each brightness interval comprises a plurality of brightness sections which are arranged in sequence, and each brightness interval is correspondingly provided with a specific duty ratio change range, the luminous brightness in each brightness section needs to be provided with a specific duty ratio, so that the dimming flexibility and the dimming instantaneity of the display screen in the brightness sections are improved; therefore, according to each level of brightness section, a duty ratio coefficient can be correspondingly set in the duty ratio change range; for example, the total number of levels of the brightness interval and the maximum brightness value in each level of brightness section are set in sequence, and then the duty ratio coefficient corresponding to each level of brightness section is accurately obtained; the duty ratio coefficient of the brightness interval can set a specific duty ratio for the display screen within a range of the brightness, and the gray tone offset loss degree in the brightness adjustment process of the display screen is restrained.
As an alternative implementation, fig. 3 shows a specific implementation flow of the display screen brightness adjusting method S206 shown in fig. 2, please refer to fig. 3, where S206 specifically includes:
s2061: and dividing the corresponding duty ratio variation range into at least two levels of duty ratio sections, wherein each level of brightness section in the brightness interval is arranged corresponding to each level of duty ratio section in the corresponding duty ratio variation range.
Illustratively, the duty ratio variation range is 1 to 0.50, the duty ratio variation range is divided into 50 duty ratio sections, wherein the 50 duty ratio sections are sequentially: 0.99-1, 0.98-0.99, …, each level of duty ratio section has a corresponding duty ratio coefficient, and PWM modulation can be carried out on one type of light source according to the specific duty ratio coefficient; therefore, each level of brightness section and each level of duty ratio section have a corresponding relationship, and further in each brightness interval, the duty ratio setting in the modulation process can be carried out on the corresponding brightness section through the duty ratio section.
S2062: and in each duty cycle section, selecting a duty cycle value in the duty cycle section as a duty cycle coefficient of the corresponding brightness section.
For example, in each duty cycle section, the maximum duty cycle value in the duty cycle section is selected as the duty cycle coefficient of the corresponding luminance section, for example, the duty cycle section is: 0.99-1, setting the maximum duty ratio value of the duty ratio section as 1, and setting the duty ratio coefficient of the brightness section corresponding to the duty ratio section as 1; therefore, a duty ratio value is selected in each duty ratio section to complete the duty ratio setting function of the luminous brightness of one type, and then in the brightness section, the display screen is subjected to consistent dimming based on the duty ratio coefficient, so that the gray level number of the display screen in the dimming process is improved.
Therefore, in the present embodiment, a duty ratio variation range is set for each brightness interval in advance, and then a correspondence relationship exists between each level of brightness section in the brightness interval and each level of duty ratio section in the duty ratio variation range, and a duty ratio coefficient corresponding to each level of duty ratio section is obtained; therefore, in the process of performing PWM dimming on the display screen, a brightness interval in which the brightness value to be controlled is located and a brightness section in which the brightness value to be controlled is located in the corresponding brightness interval are respectively determined to obtain a preset current coefficient and a preset duty ratio coefficient, parameter setting in the PWM dimming process is completed, efficient adjustment is performed on the brightness of the display screen, and gray scale color shift loss of low brightness in the display screen brightness adjustment process is reduced; the brightness change of the display screen can meet the visual appreciation requirements of users.
For better illustration of the generation process of both the preset current coefficient and the preset duty factor in the PWM dimming process of the present embodiment, the parameter setting principle in the PWM dimming process is illustrated by a specific example with reference to fig. 1 to fig. 3; the method comprises the following specific steps:
fig. 4 shows an illustration of the variation range of the light emission luminance of the display screen, in which the variation range of the light emission luminance of the display screen is: 100% -1%, dividing the variation range of the luminance of the display screen into 4-level luminance intervals, wherein the 4-level luminance intervals are respectively as follows: the dimming circuit comprises a brightness interval A, a brightness interval B, a brightness interval C and a brightness interval D, wherein each brightness interval represents different brightness sets, and each brightness interval corresponds to a specific current coefficient and a specific duty ratio change range, so that self-adaption and accurate dimming are performed on each type of brightness.
Further, if the brightness value to be controlled is within the range of the brightness interval a, the current coefficient a can be directly used as a parameter in PWM dimming; fig. 5 shows the distribution of the multi-level luminance sections in the luminance interval a, please refer to fig. 5, the luminance interval a is divided into 50-level luminance sections, and the 50-level luminance sections are respectively: luminance section 01, luminance section 02, …, luminance section 49, luminance section 50; the duty ratio variation range a corresponds to the luminance interval a, and since the luminance interval a includes a 50-level luminance section, as shown in fig. 5, the duty ratio variation range a is divided into 50-level duty ratio sections, where the 50-level duty ratio sections are sequentially: 0.99-1, 0.98-0.99 and …, wherein each level of duty cycle section corresponds to each level of brightness section, each duty cycle section is provided with a corresponding duty cycle coefficient, for example, the duty cycle coefficient corresponding to the duty cycle section 0.99-1 is 1, the duty cycle coefficient corresponding to the duty cycle section 0.98-0.99 is 0.99, and so on; then, the brightness value to be controlled is obtained, the brightness interval in which the brightness value to be controlled is located and the brightness section in the corresponding brightness interval are determined, so that a preset current coefficient and a preset duty ratio coefficient are respectively obtained, parameter setting in the pulse width modulation process is completed, and flexible adjustment is carried out on the display screen; even if the brightness of the display screen changes sharply, the brightness consistency and the coordination of the display screen can be still maintained, and the damage to the image quality of the display screen is avoided.
As an optional implementation manner, in the display screen brightness adjustment method S101 shown in fig. 1, the variation range is divided into at least 2 brightness intervals, specifically:
determining the number of gears to be controlled, and dividing the change range into at least two brightness intervals according to the number of gears to be controlled.
Exemplarily, the number of gears to be controlled is predetermined according to the image quality requirement of a user on a display screen, and then the light emitting brightness of the display screen is subjected to graded adjustment; it should be noted that if the number of the shift stages divided by the variation range of the light-emitting brightness of the display screen is larger, the PWM light-dimming is performed on different light-emitting brightness, and the degree of the gray scale level loss of the display screen in the light-dimming process is also lower; for example, in the present embodiment, the variation ranges of the light-emitting brightness of the display screen are uniformly divided according to the number of the gears to be controlled, and then the variation ranges of the light-emitting brightness in each gear of the brightness interval are the same, so that under different light-emitting brightness modulation requirements, more uniform dimming is performed on the display screen in each gear of the brightness interval.
As an alternative implementation, fig. 6 shows a specific implementation flow of the display screen brightness adjusting method S102 in fig. 1, where in S102, a light meter device is used to set a current coefficient according to each brightness interval, and the specific implementation flow specifically includes:
s1021: and setting the duty ratio parameter, the white balance color temperature and the preset brightness value of each grade of brightness interval.
It should be noted that the white balance color temperature is the color temperature of the display screen during the white balance adjustment process; illustratively, the white balance color temperature is: greater than or equal to 5000 Kelvin and less than or equal to 10000 Kelvin; because each brightness interval respectively comprises the brightness of different variation ranges, the duty ratio parameter, the white balance color temperature and the preset brightness value all represent the theoretical parameters of brightness adjustment in the brightness interval, and the optimal current coefficient can be obtained by combining the theoretical parameters so as to carry out consistent dimming on the display screen.
S1022: and acquiring a corresponding current coefficient by using photometric equipment according to the duty ratio parameter, the white balance color temperature and the preset brightness value of each brightness interval.
Illustratively, for the luminance brightness of a certain luminance interval, the input current amplitude of the display screen is respectively adjusted at a duty ratio parameter, a white balance color temperature and a preset luminance value, when the gray level number of a light source of the display screen and the image display quality are optimal, the input current amplitude corresponding to the display screen is taken as a current coefficient, and then the current coefficient is taken as a parameter reference in the PWM dimming process of the luminance interval, so that flexible luminance adjustment of the display screen is realized, the optimal dimming effect can be achieved for the display screen based on the current coefficient, and particularly, the gray level number loss of the display screen is reduced under the low luminance condition of the display screen.
Illustratively, the duty cycle parameter of the luminance interval is greater than 0.9 and less than or equal to 1.
Preferably, the duty parameter of the luminance section is set to 1.
In the process of setting a current coefficient for each brightness interval of the display screen, under the condition that the duty ratio of the input current of the display screen is 1, carrying out self-adaptive adjustment on the input current amplitude of the display screen, detecting the picture of the display screen by adopting light measuring instrument equipment, and when the picture quality of the display screen is optimal, taking the input current amplitude of the display screen as the current coefficient; then, for the light-emitting brightness in each range of brightness interval, the light-emitting brightness of the display screen has the best adjusting efficiency according to the corresponding current coefficient.
Illustratively, the preset luminance values of the luminance interval are: the maximum light emission luminance in the luminance section.
For example, a luminance interval of the display screen is 25% to 50%, the maximum luminance in the luminance interval is: 50%, i.e. 50% of the preset maximum brightness; in each brightness interval, under the maximum brightness of the brightness interval, amplitude adjustment is carried out on the input current of the display screen, so that when the image gray level number of the display screen is optimal, the amplitude of the input current of the display screen is taken as a current coefficient corresponding to the brightness interval, and further, in each grade of brightness interval, PWM adjustment can be carried out on the brightness set based on the current coefficient, and further, the offset loss degree of the brightness interval to the gray level and the tone of the brightness is reduced; therefore, the display screen has better PWM dimming quality.
As an optional implementation manner, in the display screen brightness adjustment method S107 shown in fig. 1, the generating a brightness adjustment instruction according to a preset current coefficient and a preset duty ratio coefficient specifically includes: generating a brightness adjusting instruction according to a preset current coefficient and a preset duty ratio coefficient, wherein the brightness adjusting instruction comprises the following steps: the display device comprises an instruction packet header, a brightness duty ratio coefficient and a display screen current coefficient.
The display screen current coefficient is equal to a preset current coefficient, and the brightness duty ratio coefficient is equal to a preset duty ratio coefficient.
The brightness adjusting instruction has a brightness driving function of the display screen, and comprises various brightness adjusting information, and further the brightness adjusting instruction fuses two types of information of a preset current coefficient and a preset duty ratio coefficient; when the brightness adjusting instruction is output to the display screen, analyzing the brightness adjusting instruction to respectively obtain an instruction packet header, a brightness duty ratio coefficient and a display screen current coefficient; the instruction packet head is used for driving a brightness adjusting function of the display screen, so that the brightness of the display screen can be efficiently adjusted; and the brightness of the display screen can be changed through the brightness adjusting instruction, so that the display screen can adjust the amplitude and the duty ratio of the input current of the display screen according to the preset current coefficient and the preset duty ratio coefficient to complete the PWM dimming function of the display screen, the image display quality of the display screen is ensured, and the gray scale and tone bias loss degree of the display screen in the brightness adjusting process is avoided.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Fig. 7 shows a schematic structure of a display screen brightness adjusting system 70 with low offset loss of gray tone according to this embodiment, please refer to fig. 7, the display screen brightness adjusting system 70 includes: the dimming control circuit comprises an interval division module 701, a current setting module 702, a section division module 703, a gear determination module 704, a current acquisition module 705, a duty ratio acquisition module 706 and a PWM dimming module 707.
The interval division module 701 is configured to obtain a variation range of the light emission brightness of the display screen, and divide the variation range into at least two brightness intervals.
The current setting module 702 is configured to set a current coefficient according to each brightness interval by using a light measuring instrument, where each brightness interval corresponds to each current coefficient.
The section dividing module 703 is configured to divide each brightness interval into at least two brightness sections, where each brightness section corresponds to a duty ratio coefficient.
The gear determining module 704 is configured to obtain a brightness value to be controlled, and determine a gear of a brightness interval where the brightness value to be controlled is located and a number of stages of a brightness section where the brightness value to be controlled is located.
The current obtaining module 705 is configured to obtain a corresponding preset current coefficient according to a one-to-one correspondence relationship between each brightness interval and each current coefficient.
The duty ratio obtaining module 706 is configured to obtain a corresponding preset duty ratio coefficient according to a one-to-one correspondence relationship between each level of brightness section and each duty ratio coefficient.
The PWM dimming module 707 is configured to generate a brightness adjustment instruction according to a preset current coefficient and a preset duty ratio coefficient, and output the brightness adjustment instruction to the display screen, so as to perform pulse width modulation dimming on the display screen, thereby implementing brightness adjustment of the display screen.
It should be noted that, each circuit module of the display screen brightness adjusting system 70 in fig. 7 corresponds to the display screen brightness adjusting method in fig. 1, and therefore, reference may be made to the embodiment in fig. 1 for specific implementation of each circuit module of the display screen brightness adjusting system 70 in fig. 7, which will not be described again here.
In the structural schematic of the display screen brightness adjusting system 70 shown in fig. 7, according to the brightness variation rule of the display screen, the variation range of the brightness of the display screen is divided into a plurality of brightness intervals in advance, and each brightness interval is divided into a plurality of levels of brightness sections, wherein each level of brightness interval is correspondingly provided with a current coefficient, and each level of brightness section is correspondingly provided with a duty ratio coefficient, so that in the process of continuously adjusting the brightness of the display screen, a specific brightness interval is matched according to the brightness value to be controlled and a specific brightness section is matched in the corresponding brightness interval to complete parameter setting in the PWM dimming process of the display screen, and the brightness of the display screen is adaptively adjusted through a brightness adjusting instruction; therefore, the embodiment pre-divides the luminous intensity of the display screen into different intervals to realize the self-adaptive PWM adjustment of the luminous intensity in each interval, thereby greatly reducing the color tone offset loss of the display screen at low brightness and also reducing the gray scale loss and the color tone offset of the display screen; the problem that the gray scale number of an image is seriously lost when a display screen is dimmed in the conventional technology and the visual experience of a user is poor is effectively solved.
In summary, in the present embodiment, in the process of adjusting the light emission brightness of the display screen, the light emission brightness of the display screen is divided into multiple levels of brightness intervals in advance, and then the current coefficients and the duty coefficients are respectively set for the light emission brightness at different levels; then, in the process of adjusting the brightness of the display screen, obtaining a corresponding preset current coefficient and a corresponding preset duty ratio coefficient, and then carrying out self-adaptive PWM dimming on the display screen according to the brightness adjusting instruction, thereby reducing the gray scale number loss of the display screen; the brightness of the display screen has higher consistency in the process of PWM adjustment, the actual visual demand of a user is met, better visual experience is brought to the user, and the practical value is higher; the defects that in the prior art, the display screen has hue deviation in the brightness adjusting process, and particularly has gray level loss in a low-brightness environment are overcome.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (8)
1. A method for adjusting the brightness of a display screen with low offset loss of gray tone is characterized by comprising the following steps:
obtaining the change range of the luminous brightness of the display screen, and dividing the change range into at least two ranges of brightness intervals;
setting a current coefficient according to each brightness interval by adopting photometric equipment, wherein each brightness interval corresponds to each current coefficient one by one; wherein, adopt photometric meter equipment is according to every shelves luminance interval sets for the current coefficient, specifically includes: setting a duty ratio parameter, a white balance color temperature and a preset brightness value of each brightness interval; acquiring a corresponding current coefficient by the photometric instrument according to the duty ratio parameter, the white balance color temperature and a preset brightness value of each brightness interval;
dividing each grade of the brightness interval into at least two levels of brightness sections, wherein each level of the brightness sections respectively correspond to a duty ratio coefficient; each level of the brightness section corresponds to a duty ratio coefficient, and the method specifically includes: acquiring a duty ratio variation range corresponding to the brightness interval; counting the number of levels of a brightness section in the brightness interval; obtaining a duty ratio coefficient corresponding to the brightness section according to the number of levels of the brightness section in the brightness interval and the corresponding duty ratio change range;
acquiring a brightness value to be controlled, and determining a gear of a brightness interval where the brightness value to be controlled is located and the stage number of a brightness section where the brightness value to be controlled is located;
obtaining corresponding preset current coefficients according to the one-to-one correspondence relationship between each brightness interval and each current coefficient;
obtaining corresponding preset duty ratio coefficients according to the one-to-one correspondence relationship between each level of the brightness sections and each duty ratio coefficient;
and generating a brightness adjusting instruction according to the preset current coefficient and the preset duty ratio coefficient, and outputting the brightness adjusting instruction to the display screen so as to perform pulse width modulation dimming on the display screen and realize brightness adjustment of the display screen.
2. The method for adjusting the brightness of the display screen according to claim 1, wherein obtaining the duty ratio coefficient corresponding to the brightness section according to the number of levels of the brightness section in the brightness section and the corresponding duty ratio variation range specifically comprises:
dividing the corresponding duty ratio variation range into at least two levels of duty ratio sections, wherein each level of brightness section in the brightness interval is arranged corresponding to each level of duty ratio section in the corresponding duty ratio variation range;
and in each duty cycle section, selecting a duty cycle value in the duty cycle section as a duty cycle coefficient of the corresponding brightness section.
3. The method for adjusting the brightness of the display screen according to claim 1, wherein the variation range is divided into at least two brightness intervals, specifically:
determining the number of gears to be controlled, and dividing the change range into at least two brightness intervals according to the number of gears to be controlled.
4. The display screen brightness adjusting method according to claim 1, wherein the duty ratio parameter of the brightness interval is greater than 0.9 and less than or equal to 1.
5. The display screen brightness adjustment method of claim 4, wherein the duty ratio parameter of the brightness interval is set to 1.
6. The method for adjusting the brightness of the display screen according to claim 1, wherein the preset brightness values of the brightness interval are: the maximum light emission luminance in the luminance section.
7. The method for adjusting the brightness of the display screen according to claim 1, wherein generating a brightness adjustment instruction according to the preset current coefficient and the preset duty ratio coefficient specifically comprises:
generating the brightness adjusting instruction according to the preset current coefficient and the preset duty ratio coefficient, wherein the brightness adjusting instruction comprises: the method comprises the steps of instructing a packet header, a brightness duty ratio coefficient and a display screen current coefficient;
the display screen current coefficient is equal to a preset current coefficient, and the brightness duty ratio coefficient is equal to a preset duty ratio coefficient.
8. A display screen brightness adjustment system with reduced bias loss of gray tone, comprising:
the interval division module is used for acquiring the change range of the luminous brightness of the display screen and dividing the change range into at least two brightness intervals;
the current setting module is used for setting a current coefficient according to each brightness interval by adopting light measuring instrument equipment, and each brightness interval corresponds to each current coefficient one by one;
the section dividing module is used for dividing each grade of the brightness interval into at least two levels of brightness sections, and each level of the brightness sections respectively correspond to a duty ratio coefficient;
the gear determining module is used for acquiring a brightness value to be controlled, and determining the gear of a brightness interval where the brightness value to be controlled is located and the stage number of a brightness section where the brightness value to be controlled is located;
the current acquisition module is used for acquiring corresponding preset current coefficients according to the one-to-one correspondence relationship between each brightness interval and each current coefficient;
the duty ratio obtaining module is used for obtaining corresponding preset duty ratio coefficients according to the one-to-one correspondence relationship between each level of the brightness section and each duty ratio coefficient;
the PWM dimming module is used for generating a brightness adjusting instruction according to the preset current coefficient and the preset duty ratio coefficient and outputting the brightness adjusting instruction to the display screen so as to perform pulse width modulation dimming on the display screen and realize brightness adjustment of the display screen;
the current setting module is specifically configured to:
setting a duty ratio parameter, a white balance color temperature and a preset brightness value of each brightness interval;
acquiring a corresponding current coefficient by the photometric instrument according to the duty ratio parameter, the white balance color temperature and a preset brightness value of each brightness interval;
the segment dividing module is specifically configured to:
acquiring a duty ratio variation range corresponding to the brightness interval;
counting the number of levels of a brightness section in the brightness interval;
and obtaining a duty ratio coefficient corresponding to the brightness section according to the number of stages of the brightness section in the brightness interval and the corresponding duty ratio change range.
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