CN107111992B - method and terminal for adjusting backlight brightness - Google Patents
method and terminal for adjusting backlight brightness Download PDFInfo
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- CN107111992B CN107111992B CN201580064010.4A CN201580064010A CN107111992B CN 107111992 B CN107111992 B CN 107111992B CN 201580064010 A CN201580064010 A CN 201580064010A CN 107111992 B CN107111992 B CN 107111992B
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- 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
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- G09G3/36—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 using liquid crystals
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The embodiment of the invention relates to a method and a terminal for adjusting backlight brightness, wherein the method comprises the following steps: acquiring parameters of an image, wherein the parameters comprise one or more of image change rate, chromaticity proportion, spatial resolution and image brightness; determining a speed of backlight brightness adjustment for the display device according to a parameter of the image and a preset parameter threshold, wherein the preset parameter threshold corresponds to the parameter of the image and comprises one or more of an image change rate threshold, a chromaticity proportion threshold, a spatial resolution threshold and an image brightness threshold. The speed of adjusting the backlight brightness of the image is determined by acquiring the parameters of the image and according to the parameters of the image. Determining a target brightness for adjusting the backlight brightness of the display device according to the external environment luminance value and the parameter of the image, and adjusting the backlight brightness of the image to the target brightness according to the determined adjusting speed. The proper adjusting speed can prevent the user from seeing the backlight flicker, and simultaneously, the display effect of the image can be optimal.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a method and a terminal for adjusting backlight brightness.
Background
In the era of smart machine development, the display effect and the standby time of the LCD are becoming the focus of smart machine attention. The backlight brightness of the LCD is closely related to the display effect and power consumption. When the backlight brightness of the LCD is appropriate, the display capability of the LCD can be fully exerted; however, when the backlight brightness of the LCD is too low, the display content of the LCD will become dim, the contrast ratio is low, and the visibility is poor; when the backlight brightness of the LCD is too high, although the display effect is not poor, the damage to eyes is large, and meanwhile, the power consumption is very large, and the service time of the intelligent machine is influenced.
In addition, the LCD is a passive luminous display screen, the display effect of the content of the LCD is related to the brightness of the environment, the backlight brightness of the LCD must be adjusted to be high under the sun so that the display content can be clear; in a dim room, the LCD backlight can obtain good visibility only by dark brightness, and the display content is very clear.
The environment of the user using the intelligent machine is often changeable, the environment can be changed at all times indoors or outdoors at evening or midday, the intelligent machine needs to make corresponding adjustment according to the environment in order to obtain uniform visibility and display effect when the user uses the intelligent machine, however, in the adjustment process, if the amplitude is too large, the user can find flicker, and if the adjustment speed is too slow, the brightness cannot follow the change of the environment, and the effect of uniform visibility cannot be achieved.
disclosure of Invention
The embodiment of the invention provides a method and a system for adjusting backlight brightness. Determining a target brightness for adjusting the backlight brightness of the display device according to the external environment luminance value and the parameter of the image, and adjusting the backlight brightness of the image to the target brightness according to the determined adjusting speed. The proper adjusting speed can prevent the user from seeing the backlight flicker, and simultaneously, the display effect of the image can be optimal.
In a first aspect, the present invention provides a method for adjusting backlight brightness, the method comprising:
Parameters of the image are acquired, which may include one or more of image rate of change, chroma scale, spatial resolution, and image brightness.
determining a speed of backlight brightness adjustment for the display device according to a parameter of the image and a preset parameter threshold, wherein the preset parameter threshold corresponds to the parameter of the image and comprises one or more of an image change rate threshold, a chromaticity proportion threshold, a spatial resolution threshold and an image brightness threshold.
When the parameter meets the preset parameter threshold, the speed of adjusting the backlight brightness of the display device is determined, the backlight brightness of the display device is automatically adjusted according to the adjusting speed, backlight flicker can be prevented from being seen by a user, and meanwhile the display effect of the image can be optimal under any condition.
With reference to the first aspect, in a first possible implementation manner of the first aspect, if the parameter is one of an image change rate, a color contrast ratio, and a spatial resolution, determining a speed of adjusting a backlight brightness of the display device according to the parameter of the image and a preset parameter threshold includes:
When the parameter is greater than or equal to the corresponding preset parameter threshold, determining the speed of adjusting the backlight brightness of the display device as a first speed;
conversely, when the parameter is less than the corresponding preset parameter threshold, the speed of backlight brightness adjustment for the display device is determined to be a second speed, the second speed being less than the first speed.
When the parameter is one of the image change rate, the chromaticity proportion and the spatial resolution, and when the parameter is greater than the preset parameter threshold, the backlight brightness of the display device is adjusted quickly, so that the image display effect can be better optimized, meanwhile, the situation that a user sees backlight flicker can be avoided, and when the parameter is less than the preset parameter threshold, the adjustment speed needs to be slowed down as much as possible, so that the user cannot see the backlight flicker.
with reference to the first aspect, in a second possible implementation manner of the first aspect, if the parameter of the image is image brightness, determining a speed of adjusting backlight brightness of the display device according to the parameter of the image and a preset parameter threshold, includes: when the image brightness is less than or equal to the corresponding preset parameter threshold value, determining the speed of the backlight brightness adjustment of the display device as a third speed,
Alternatively, the first and second electrodes may be,
And when the image brightness is greater than the corresponding preset parameter threshold, determining the speed of adjusting the backlight brightness of the display device as a fourth speed, wherein the fourth speed is less than the third speed.
Similar to the previous embodiment, except that the parameter is the image brightness, when the image brightness is greater than or equal to the preset parameter threshold corresponding to the image brightness, the backlight brightness needs to be adjusted at a slow speed so as to prevent the user from seeing the backlight flicker. When the image brightness is less than or equal to the corresponding preset parameter threshold, the image effect can be optimized more quickly by using a slightly faster speed.
With reference to any one possible implementation manner of the first aspect to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, when the number of the acquired image parameters is multiple and each parameter satisfies a preset parameter threshold corresponding to the parameter, the adjustment speed needs to be determined according to an actual situation. Therefore, the user can avoid seeing the backlight flicker, and the image can achieve the best display effect.
With reference to any one possible implementation manner of the first aspect to the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, before acquiring parameters of an image, the method further includes:
Acquiring an ambient luminosity value of an image; and determining the target brightness for adjusting the backlight brightness of the display device according to the ambient luminosity value and the image parameter of the image, and adjusting the backlight brightness of the display device to the target brightness according to the determined backlight brightness adjusting speed of the display device.
in a second aspect, an embodiment of the present invention provides an apparatus for adjusting backlight brightness, including:
The image processing unit is used for acquiring parameters of the image, and the parameters can comprise one or more of image change rate, chromaticity proportion, spatial resolution and image brightness.
And the speed adjusting unit is used for determining the speed of adjusting the backlight brightness of the display device according to the parameters of the image and preset parameter thresholds, wherein the preset parameter thresholds correspond to the parameters of the image and comprise one or more of an image change rate threshold, a chromaticity proportion threshold, a spatial resolution threshold and an image brightness threshold.
When the parameter satisfies the preset parameter threshold, the speed adjusting unit may determine a speed of backlight brightness adjustment of the display device. And automatically adjusting the backlight brightness of the display device according to the determined backlight brightness adjusting speed, so that the backlight flicker can be prevented from being seen by a user, and the image display effect can be optimal under any condition.
With reference to the second aspect, in a first possible implementation manner of the second aspect, when the parameter is one of an image change rate, a chromaticity ratio, and a spatial resolution, the speed adjusting unit is specifically configured to:
When the parameter is greater than or equal to the corresponding preset parameter threshold, determining the speed of adjusting the backlight brightness of the display device as a first speed;
Conversely, when the parameter is less than the corresponding preset parameter threshold, the speed of backlight brightness adjustment for the display device is determined to be a second speed, the second speed being less than the first speed.
When the parameter is one of the image change rate, the chromaticity ratio and the spatial resolution, and when the parameter is greater than the preset parameter threshold, the speed adjusting unit can adjust the backlight brightness of the display device at a higher speed, so that the image display effect is faster and optimal, and simultaneously, the user can be prevented from seeing the backlight flicker.
With reference to the second aspect, in a second possible implementation manner of the second aspect, if the parameter of the image is an image brightness, the speed adjusting unit is specifically configured to: when the image brightness is less than or equal to the corresponding preset parameter threshold value, determining the speed of the backlight brightness adjustment of the display device as a third speed,
Alternatively, the first and second electrodes may be,
And when the image brightness is greater than the corresponding preset parameter threshold, determining the speed of adjusting the backlight brightness of the display device as a fourth speed, wherein the fourth speed is less than the third speed.
Similar to the previous embodiment, except that the parameter is the image brightness, when the image brightness is greater than or equal to the preset parameter threshold corresponding to the image brightness, the backlight brightness needs to be adjusted at a slow speed so as to prevent the user from seeing the backlight flicker. When the image brightness is less than or equal to the corresponding preset parameter threshold, the image effect can be optimized more quickly by using a slightly faster speed.
With reference to any one possible implementation manner of the second aspect to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, when the image processing unit obtains a plurality of image parameters, and each of the parameters satisfies a preset parameter threshold corresponding to the parameter, the speed adjusting unit determines the adjusting speed according to an actual situation. Therefore, the user is prevented from seeing the backlight flicker, and the image can achieve the best display effect as much as possible.
With reference to any one possible implementation manner of the second aspect to the second possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the apparatus further includes:
The sensing unit is used for acquiring an ambient photometric value of an image; the speed adjusting unit is also used for determining the target brightness for adjusting the backlight brightness of the display device according to the ambient luminosity value of the image acquired by the sensing unit and the image parameter acquired by the image processing unit; and adjusting the backlight brightness of the display device to the target brightness according to the determined speed of the backlight brightness adjustment of the display device.
In a third aspect, an embodiment of the present invention provides a terminal, including:
A display for displaying an image; a sensor for acquiring an ambient luminosity value; a processor, a memory, and one or more programs, wherein the one or more programs are stored in the memory, the processor executing the one or more programs to perform a method of adjusting backlight brightness as introduced in the first aspect.
Based on the above technical solution, in the method for adjusting backlight brightness provided by the embodiments of the present invention, an adjustment speed is determined according to a parameter of an image, a target brightness for adjusting backlight brightness of a display device is determined according to an ambient luminosity value and an image parameter where the image is currently located, and the backlight brightness of the display device is adjusted to the target brightness according to the adjustment speed. An appropriate adjustment speed can prevent the user from seeing the backlight flicker, and can optimize the image display effect.
drawings
fig. 1 is a system architecture diagram for adjusting backlight brightness according to an embodiment of the present invention;
Fig. 2 is a schematic flow chart illustrating a process of adjusting backlight brightness according to a second embodiment of the present invention;
Fig. 3 is a schematic structural diagram of a system for adjusting backlight brightness according to a third embodiment of the present invention;
Fig. 4 is a schematic structural diagram of a system for adjusting backlight brightness according to a fourth embodiment of the present invention.
Detailed Description
the technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
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.
Since the environment of the user is often changeable when using the smart device, in order to obtain a uniform display effect, the smart device must make corresponding adjustments according to the change of the environment. In order to avoid the user from seeing the backlight flicker in the adjusting process, the backlight brightness can be adjusted at a proper speed according to the light intensity value of the current environment and the image parameters, and the backlight brightness of the image is quickly adjusted to the target brightness value according to the adjusting speed. The invention provides a system for adjusting backlight brightness, which can enable the display effect of the image seen by a user to basically reach the optimal state in different environments.
for the convenience of the technical solution of the present invention that is easier for the reader to understand, regarding several image parameters appearing in the present invention, first a brief description is made here:
the image change rate, as the name implies, can be understood as the change rate of the image at different times, and the detection of the change rate of the image can be determined according to the frame rate refresh rule of the terminal device acquiring the image, and the frame rate of a static image will be low, while the frame rate of a dynamic image will be high. The specific method for measuring the image change rate is described in detail below, and is not described herein again.
The chroma scale, where color is represented by both chroma and luma, is the property of a color that does not include luma, and reflects the chroma and saturation of the color. And the chromaticity ratio is the chromaticity ratio and saturation ratio of the color.
Spatial resolution, refers to the minimum limit of the spatial geometry length of critical objects that can be identified in an image, i.e., the resolution of fine features.
the image brightness refers to the brightness of the picture.
In the following, the parameter threshold is preset, that is, a threshold corresponding to parameters in an image one to one, for example, the threshold of the spatial resolution of the image is 3Mhz, and the threshold of the brightness of the image is 20 nit. It should be understood that when the parameter of the image is plural, naturally, the preset parameter threshold corresponding to the image is also plural, and at least each threshold corresponding to the parameter of the image is included.
fig. 1 is a system architecture diagram 100 for adjusting backlight brightness according to an embodiment of the invention. As shown in fig. 1, the system architecture includes: an application processor 110, a data transmission interface 120, an LCD Integrated circuit (LCD IC) module 130, a light sensor 140, a memory controller (Master Control Unit, MCU)150, and a backlight driver IC 160.
The application processor 110 is connected to the LCD IC130 through the data transmission interface 120. The application processor 110 transfers one frame of image to the LCD IC130 through the data transmission interface 120. The LCD IC130 includes an image processing module for performing a traverse scan on the image, acquiring parameters including the image, and storing the parameters in a memory in the image processing module. The parameters may include one or more of image rate of change, chroma ratio, spatial resolution, and image brightness.
The image processing module may further output an output result corresponding to the current backlight brightness of the display device. The output result may be a Pulse Width Modulation (PWM) signal or a value of a duty ratio of the PWM signal.
The purpose of outputting the PWM signal or outputting the value of the duty ratio of the PWM signal by the image processing module is to perform corresponding operation by using the value of the duty ratio of the PWM signal in the MCU150, and therefore, no matter which form is output, the present invention is not limited thereto.
In the present invention, for simplicity, the image processing module is described by taking a CABC module as an example. Any action performed by the following CABC module may be referred to as a manner performed by the image processing module, and when the image processing module is another module, the manner may be slightly different, but the purpose to be achieved is the same, and therefore, the other manners will not be illustrated and not limited herein.
The light sensor 140 is connected to the MCU150, and the MCU150 will read the ambient light level in the light sensor 140. The MCU150 mainly includes a backlight Control (LABC) module corresponding to ambient light detection and a backlight condition management module, where the LABC module is used to determine a target Brightness of the backlight Brightness of the display device according to a current ambient light value detected by the light sensor 140 and a duty ratio of a PWM signal sent by the CABC module and corresponding to the current backlight Brightness of the display device. It should be noted that, when the CABC module outputs the PWM signal, the LABC module may calculate the duty ratio according to the PWM signal, and then perform corresponding operation with the ambient light value to determine the target brightness of the image backlight brightness.
The LABC module inputs the target brightness into a backlight condition management module, and the backlight condition management module is used for storing the target brightness value. And determining the adjusting speed when adjusting the backlight brightness according to the parameters stored in the register, namely, the backlight condition management module gradually adjusts the backlight brightness value (the target brightness value stored last time) of the image stored last time to the target brightness determined this time according to the adjusting speed determined this time.
Therefore, the process of adjusting the backlight brightness is a gradual process, and if the backlight brightness of the display device is immediately adjusted to the target brightness, noticeable backlight flicker occurs. Thus, in order to avoid that the user sees the backlight flicker, a suitable adjustment speed is determined based on the parameters of the image, and the backlight brightness of the image is adjusted based on the adjustment speed.
it should be noted that, when determining the adjustment speed when adjusting the backlight brightness, the number of the parameters may be multiple, and the adjustment speed of the backlight brightness of the image is determined according to the multiple parameters and the preset parameter threshold corresponding to the multiple parameters. For example, when the spatial resolution satisfies a spatial resolution threshold and the image brightness satisfies an image brightness threshold, a speed of backlight brightness adjustment is determined. The adjusting speed is determined according to actual conditions, and the determined speed is possibly lower than the speed when the two speeds independently meet the conditions, or between the speed when the two speeds independently meet the conditions, or is higher than the two speeds when the two speeds independently meet the conditions.
The system for adjusting the backlight brightness, provided by the embodiment of the invention, comprises the steps of firstly obtaining the parameters of the image, determining the speed for adjusting the backlight brightness of the image according to the parameters of the image, then determining the target brightness for adjusting the backlight brightness according to the ambient luminosity value of the image and the parameters of the image, and gradually adjusting the backlight brightness of the image to the target brightness according to the adjusting speed. When the backlight is adjusted at a proper adjusting speed, the situation that the user sees the backlight flicker can be avoided. Meanwhile, the display effect of the image can be optimized.
Fig. 2 is a flowchart 200 of a method for adjusting backlight brightness according to a second embodiment of the present invention, where the method includes functional steps mainly executed by the system components described in the first embodiment, and as shown in fig. 2, the detailed process of adjusting backlight brightness is as follows:
s210, acquiring image parameters.
Specifically, the application processor 110 transmits a frame of image to the LCD IC130 through the data transmission interface 120, and the CABC module in the LCDIC130 performs traversal scanning on the image to obtain the image parameters. The image parameters include one or more of an image change rate, a chromaticity ratio, a spatial resolution, and an image brightness.
and S220, generating an output result corresponding to the current backlight brightness of the image.
Specifically, after the CABC module performs traversal scanning on the image, the backlight brightness of the image is automatically adjusted according to the parameter of the image.
In one specific example, the parameter of the acquired image, such as an image, is the image resolution, and the image may be adjusted to a 30% higher grayscale level depending on the image resolution. At this time, the backlight luminance of the display device may be adjusted to 70%. After the adjustment, the display effect of the image is basically the same as the display effect of the image before the adjustment. At this time, the current backlight luminance of the display device is determined to be 70%, which is defined as the first backlight luminance for convenience of description below. Then, a value of a PWM signal or a duty ratio of the PWM signal corresponding to the current backlight luminance of the image is output.
It should be understood that the purpose of outputting the PWM signal or outputting the value of the duty ratio of the PWM signal is to utilize the value of the duty ratio of the PWM signal in the MCU150 for a corresponding budget, and therefore, no limitation is made herein on the output form.
And S230, acquiring the current ambient luminosity value of the image.
specifically, the luminance value of the current environment of the image is obtained by the light sensor 140 and transmitted to the LABC module of the MCU 150. So that the LABC module determines the target brightness for backlight brightness adjustment of the display device according to the ambient light value transmitted by the light sensor 140 and the duty ratio value of the PWM signal generated by the CABC module or the directly output PWM signal in step 220.
In step 220, if the CABC module outputs the PWM signal, the LABC module needs to calculate the duty ratio value of the PWM signal. Then, the duty ratio value of the PWM signal and the ambient luminance value of the image are used to determine the target brightness of the display device, which is mainly obtained by multiplication.
specifically, the LABC module and an ambient light sensor are used to obtain an ambient light value, for example, a current ambient light value obtained by the ambient light sensor is 0.7, and the LABC module may adjust the backlight brightness of the display device to 70% according to the current ambient light value, and define the backlight brightness as a second backlight brightness. And multiplying the first backlight brightness and the second backlight brightness to obtain a final target brightness value.
And S240, determining the speed of adjusting the backlight brightness of the image according to the parameter of the image and a preset parameter threshold.
As can be seen in step 210, the parameters of the image may include one or more of an image change rate, a chromaticity ratio, a spatial resolution, and an image brightness.
And the preset parameter threshold corresponds to a parameter of the image, and may include one or more of an image change rate threshold, a chroma scale threshold, a spatial resolution threshold, and an image brightness threshold.
the backlight condition management module acquires the parameters from the memory of the CABC module, and determines the speed of adjusting the backlight brightness of the display device according to the parameters and the corresponding preset parameter threshold.
specifically, when the parameter is one of an image change rate, a chromaticity ratio, and a spatial resolution, determining a speed of adjusting the backlight brightness of the display device according to the parameter of the image and a corresponding preset parameter threshold, includes:
When the parameter is greater than or equal to the corresponding preset parameter threshold, determining the speed of adjusting the backlight brightness of the display device as a first speed;
And when the parameter is smaller than the corresponding preset parameter threshold value, determining the speed of the backlight brightness adjustment of the display device as a second speed, wherein the second speed is smaller than the first speed.
For example, the parameter is an image change rate, and when the image change rate is large, it indicates that there is a moving object in the image or that the image has a large change, and the follow-up movement of the eyeball can be attracted. When the backlight condition management module detects that the image change rate is larger than or equal to the image change rate threshold value corresponding to the image change rate, adjusting the backlight brightness of the display device by adopting a first speed; and when the image conversion rate is smaller than the image change rate threshold value, adjusting the backlight brightness of the display device by adopting a second speed.
for example, the backlight condition speed management module may set the dimming speed to 50nit/s when the image change rate is detected to be greater than or equal to 60%, and set the dimming speed to 25nit/s when the image change rate is detected to be less than 60%.
according to the condition of the image change rate, the adjusting speed of the backlight brightness of the display device is determined, and the backlight brightness of the display device is gradually adjusted according to the determined adjusting speed, so that the backlight flicker phenomenon when a user sees the dimming is avoided.
the detection of the image change rate can be determined according to a frame rate refresh rule of the terminal device that acquires the image, for example, an image is acquired through a mobile phone, and if the acquired image is a static image, the frame rate of the image is very low; the frame rate of the obtained dynamic image is high, and the change rate of the PWM signal obtained according to the dynamic image information is also high, so that the dynamic image change rate is high.
The image rate of change calculation can be represented by the following formula:
image change rate fps × Δ CABC _ PWM
Where fps is the number of frames per second of transmitted images, and Δ cabac _ PWM is the output rate of change of the PWM signal.
The method is used for detecting the image change rate, because the CABC method is used during detection, and pixels of each line in the image are already subjected to traversal statistics when the CABC module acquires the image, the scanning and the operation of the whole image are not required to be repeatedly carried out during the calculation of the frame rate, so that the detection difficulty is greatly reduced.
It should be understood that the statistics of the image change rate may also be implemented in other manners, and the present invention is only an example of an implementation manner of obtaining the image change rate by the CABC method, and other implementations are not limited herein.
in another case, the spatial resolution of the luminance signal is greater than the spatial resolution of the chrominance signal by the human eye, depending on the characteristics of the human eye. When the ratio of the chrominance component to the luminance component of the picture is high, the sensitivity of human eyes will be reduced, i.e. when the ratio of the chrominance component to the luminance component is high, human eyes can avoid seeing the backlight flicker.
Therefore, when the parameter is the chromaticity proportion and the chromaticity proportion is greater than or equal to the chromaticity proportion threshold value corresponding to the chromaticity proportion, the backlight brightness of the display device can be adjusted by adopting the first speed; conversely, when the chromaticity ratio is less than the chromaticity ratio threshold, the backlight brightness of the display device is adjusted at a second speed, which is likewise less than the first speed.
for example, when the backlight condition management module detects that the chromaticity ratio is greater than or equal to 80%, the speed of dimming may be set to 55nit/s, and when the backlight condition management module detects that the chromaticity ratio is less than 80%, the speed of dimming may be set to 24 nit/s. At this time, the backlight flickering phenomenon when the user sees dimming can also be avoided.
in yet another case, the human eye is insensitive to edge gray scale errors since the human eye easily perceives changes in edge position. When the spatial resolution of the picture is reported to a certain degree, the human eye observes more the edge of the spatial resolution and is not sensitive to the gray scale of the image.
Therefore, the speed when adjusting the backlight brightness may be determined by the spatial resolution, i.e. when the parameter is the spatial resolution and when the spatial resolution of the image is greater than or equal to the spatial resolution threshold, the backlight brightness of the display device may be adjusted at the first speed; and when the spatial resolution of the image is smaller than the spatial resolution threshold, adjusting the backlight brightness of the display device by adopting a second speed.
For example, when the spatial resolution is greater than or equal to 3Mhz, the speed of dimming may be set to 52nit/s, and when the spatial resolution is less than 3Mhz, the speed of dimming may be set to 21 nit/s. At this time, the backlight flickering phenomenon when the user sees dimming can also be avoided.
In still another case, when the overall brightness of the image is below a certain level, the magnitude of the flicker is reduced due to the masking effect, and the user can be prevented from seeing the backlight flicker to some extent. Therefore, the brightness of the image may also be used to determine the speed at which the backlight brightness is adjusted.
when the parameter is the brightness of the image and the brightness of the image is less than or equal to the image brightness threshold value corresponding to the image, the backlight brightness of the display device can be adjusted at a third speed; and when the brightness of the image is greater than the image brightness threshold, adjusting the backlight brightness of the display device at a fourth speed, wherein the fourth speed is less than the third speed.
For example, when the brightness of the image is less than or equal to 20nit, the speed of backlight adjustment may be set to 50nit/s, and when the brightness of the image is greater than 20nit, the speed of backlight adjustment may be set to 25 nit/s.
And S250, gradually adjusting the current backlight brightness of the display device to the target brightness according to the determined speed of adjusting the backlight brightness of the display device.
specifically, as can be seen from the first embodiment, the backlight condition management module may store the target brightness. Therefore, the backlight condition management module may adjust the previously stored backlight luminance value (the previously stored target luminance value) to the target luminance value according to the adjustment speed determined at this time. Also, after each adjustment, a PWM signal corresponding to the adjusted backlight brightness value is output to convert the PWM signal into a current for driving the backlight.
For example, the backlight luminance value of the previously stored image is 60% and the target luminance value is 50%, and the adjustment speed is 2% per time, that is, at the first time, the backlight luminance is adjusted to 58%, and then the backlight luminance value 58% is converted into a corresponding PWM signal, which is input to the backlight driving IC160 for driving the backlight. At the next time, when the current backlight brightness value is adjusted to 58% to 56%, the same backlight brightness value 56% is converted into a corresponding PWM signal, which is input to the backlight driving IC160 for driving the backlight. And the like, slowly adjusting the backlight brightness to the target brightness value, and inputting the target brightness value into the backlight driving IC.
it should be noted that, when determining the speed of adjusting the backlight brightness of the display device according to the parameters, the number of the parameters may also be multiple, and when the parameters are multiple, for example, when the parameters are the change rate and the chromaticity ratio of the image, if the change rate of the image is greater than 60% and the chromaticity ratio is less than 80%, the backlight condition management module may determine the adjusting speed to be 35 nit/s. The speed at this time is between 55nit/s when the image change rate is more than 60% and 24nit/s when the chromaticity ratio is less than 80%.
It should be understood that the determination of the speed of adjusting the backlight according to the image change rate and the chromaticity ratio of the image is not a superimposed value of two adjustment speeds, but an adjustment speed determined intelligently according to the actual situation by the backlight condition management module. The speed at this time may be a faster speed value, a slower speed value, or a value in between than the adjustment speed determined based on either of the parameters.
In summary, an appropriate adjustment speed is determined according to the parameters, and the amplitude of the backlight flicker is reduced when the terminal device automatically adjusts the backlight, thereby preventing the user from seeing the backlight flicker. Meanwhile, the display effect of the image is optimal.
Similarly, when the parameters are the image change rate, the chromaticity ratio of the image and the brightness of the image, a proper backlight adjusting speed is determined according to the fact that the parameters meet the preset parameter threshold value corresponding to the parameters, so that the backlight flickering amplitude is reduced when the terminal device automatically adjusts the backlight, the situation that a user sees the backlight flickering is avoided, and the image display effect is optimal.
According to the method for adjusting the backlight brightness, provided by the embodiment of the invention, the speed for adjusting the backlight brightness of the display device is determined according to the parameters of the image by acquiring the parameters of the image, then the target brightness for adjusting the backlight brightness is determined according to the ambient luminosity value of the image and the image parameters, and the backlight brightness of the display device is gradually adjusted to the target brightness according to the adjusting speed. When the backlight is adjusted at a proper adjusting speed, the situation that the user sees the backlight flicker can be avoided. Meanwhile, the display effect of the image can be optimized.
fig. 3 is a schematic structural diagram of an apparatus for adjusting backlight brightness according to a third embodiment of the present invention, as shown in fig. 3, the apparatus includes an image processing unit 301 and a speed adjusting unit 302.
An image processing unit 301 for acquiring parameters of the image.
Specifically, the image processing unit 301 performs traversal scanning on the image to obtain image parameters. Wherein the parameters include one or more of image rate of change, chroma ratio, spatial resolution, and image brightness.
A speed adjusting unit 302, configured to determine a speed of adjusting the backlight brightness of the display device according to the parameter of the image and a preset parameter threshold.
in particular, the parameters of the image may include one or more of an image rate of change, a chromaticity ratio, a spatial resolution, and an image luminance.
The preset parameter threshold corresponds to a parameter of the image, and includes one or more of an image change rate threshold, a chroma scale threshold, a spatial resolution threshold, and an image brightness threshold.
In one case, when the parameter is one of an image change rate, a chromaticity ratio, and a spatial resolution, and when the parameter is greater than or equal to a corresponding preset parameter threshold, the speed adjustment unit 302 determines a speed of backlight luminance adjustment of a backlight luminance display device of the display device to be a first speed;
When the parameter is less than the corresponding preset parameter threshold, the speed adjustment unit 302 determines a speed of backlight brightness adjustment of the backlight brightness display device to be a second speed, wherein the second speed is less than the first speed.
in another case, when the parameter is the image brightness, and when the image brightness is less than or equal to the corresponding preset parameter threshold, the speed adjustment unit 302, determines the speed of the backlight brightness adjustment of the backlight brightness display device of the display device to be the third speed,
Alternatively, the first and second electrodes may be,
When the image brightness is greater than the corresponding preset parameter threshold, the speed adjusting unit 302 determines that the speed of adjusting the backlight brightness of the backlight brightness display device of the display device is a fourth speed, where the fourth speed is less than the third speed.
The specific process of determining the backlight brightness adjustment speed of the display device by the speed adjustment unit 302 according to the image parameter and the predetermined parameter threshold may refer to the content in step 230 in embodiment two, and is not described herein again.
In addition, the apparatus further comprises a sensing unit 303 for acquiring an ambient luminosity value at which the image is located.
The speed adjusting unit 302 is further configured to determine a target brightness for adjusting the backlight brightness of the backlight brightness display device of the display device according to the ambient luminosity value of the image obtained by the sensing unit and the image parameter obtained by the image processing unit; and adjusting the backlight brightness of the display device to the target brightness according to the determined speed of the backlight brightness adjustment of the display device.
Specifically, the image processing unit 301 may adjust the backlight brightness of the display device according to the acquired parameter. For example, the parameter for acquiring the image is the image resolution, and the gray scale of the image may be adjusted up to 30% according to the resolution of the image. At this time, the backlight luminance of the display device may be adjusted to 70%. After the adjustment, the display effect of the image is basically the same as the display effect of the image before the adjustment. Accordingly, the first backlight luminance value of the display device was determined to be 70%.
The sensing unit 303 obtains that the current ambient luminance value of the image is 0.7, and at this time, the backlight luminance of the display device may be adjusted to a backlight luminance value corresponding to the ambient luminance value, that is, a second backlight luminance value, for example, 70%.
The speed adjusting unit 302 multiplies the first backlight luminance value and the second backlight luminance value to obtain the final target luminance of the backlight luminance adjustment of the display device, and stores the current value of the backlight luminance.
When the speed adjustment unit 302 determines the target brightness value of the current time, the previously stored backlight brightness value (the previously stored target brightness value) is adjusted to the target brightness value according to the adjustment speed determined at this time. Also, after each adjustment, the speed adjustment unit 302 outputs a PWM signal corresponding to the adjusted backlight luminance value to convert the PWM signal into a current for driving the backlight.
for example, the backlight luminance value of the previously stored image is 60% and the target luminance value is 50%, and the adjustment speed is 2% per instant, that is, at the first instant, the backlight luminance is adjusted to 58%, and then the backlight luminance value 58% is converted into a corresponding PWM signal so as to convert the PWM signal into a current for driving the backlight. At the next instant, the current backlight brightness value of 58% is adjusted to 56%, and the same backlight brightness value of 56% is converted into a corresponding PWM signal for converting it into a current for driving the backlight. And by analogy, slowly adjusting the backlight brightness to the target brightness value, and converting the target brightness value into current for driving the backlight.
it should be noted that, when the speed adjustment unit 302 determines the speed of adjusting the backlight brightness of the display device according to the parameters, the number of the parameters may be multiple, and when the parameters are multiple, for example, when the parameters are the change rate and the chromaticity ratio of the image, if the change rate of the image is greater than 60% and the chromaticity ratio is less than 80%, the speed adjustment unit 302 may determine the adjustment speed to be 35 nit/s. The speed at this time is between 55nit/s when the image change rate is more than 60% and 24nit/s when the chromaticity ratio is less than 80%.
It should be understood that the speed adjusting unit 302 determines to adjust the speed of the backlight according to the image change rate and the chromaticity ratio of the image, not the superimposed value of the two adjusting speeds, but the speed adjusting unit 302 intelligently determines the adjusting speed according to the actual situation. The speed at this time may be a faster speed value, a slower speed value, or a value in between than the adjustment speed determined based on either of the parameters.
in summary, an appropriate adjustment speed is determined according to the parameters, and the amplitude of the backlight flicker is reduced when the terminal device automatically adjusts the backlight, thereby preventing the user from seeing the backlight flicker. Meanwhile, the display effect of the image is optimal.
Similarly, when the parameters are the image change rate, the chromaticity ratio of the image and the brightness of the image, a proper backlight adjusting speed is determined according to the fact that the parameters meet the preset parameter threshold value corresponding to the parameters, so that the backlight flickering amplitude is reduced when the terminal device automatically adjusts the backlight, the situation that a user sees the backlight flickering is avoided, and the image display effect is optimal.
According to the system for adjusting the backlight brightness, provided by the embodiment of the invention, the image parameters are obtained through the image processing unit, the speed for adjusting the backlight brightness of the display device is determined according to the image parameters, then the target brightness for adjusting the backlight brightness is determined according to the ambient luminosity value of the image and the image parameters, and the speed adjusting unit gradually adjusts the backlight brightness of the display device to the target brightness according to the adjusting speed. When the backlight is adjusted at a proper adjusting speed, the situation that the user sees the backlight flicker can be avoided. Meanwhile, the display effect of the image can be optimized.
Fig. 4 is a schematic structural diagram of a terminal for adjusting backlight brightness according to a fourth embodiment of the present invention, as shown in fig. 4, the terminal includes a display 401 for displaying an image; a sensor 402 for obtaining an ambient light value; a processor 403, a memory 404, and one or more programs, wherein the one or more programs are stored in the memory, and the processor executes the one or more programs to perform the method for adjusting the backlight brightness as described in embodiment two. For specific method steps, reference may be made to embodiment two, which is not described herein again.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method of adjusting backlight brightness, the method comprising:
Acquiring parameters of an image, wherein the parameters comprise one or more of image change rate, chromaticity proportion, spatial resolution and image brightness; wherein the image change rate is determined by a frame rate at which the display device displays the image;
Determining the speed of adjusting the backlight brightness of the display device according to the parameters of the image and preset parameter thresholds, wherein the preset parameter thresholds correspond to the parameters of the image and comprise one or more of an image change rate threshold, a chromaticity proportion threshold, a spatial resolution threshold and an image brightness threshold;
Acquiring an ambient luminosity value of the image;
determining target brightness for adjusting backlight brightness of the display device according to the ambient luminosity value of the image and the parameters of the image;
and adjusting the backlight brightness of the display device to the target brightness according to the determined speed of the backlight brightness adjustment of the display device.
2. The method of claim 1, wherein when the parameter is one of a rate of change of an image, a chromaticity ratio and a spatial resolution, the determining a speed of backlight brightness adjustment for the display device according to the parameter of the image and a preset parameter threshold comprises:
when the parameter is greater than or equal to the corresponding preset parameter threshold value, determining the speed of adjusting the backlight brightness of the display device as a first speed;
And when the parameter is smaller than the corresponding preset parameter threshold value, determining the speed of adjusting the backlight brightness of the display device as a second speed, wherein the second speed is smaller than the first speed.
3. the method of claim 1, wherein when the parameter is image brightness, the determining a speed of backlight brightness adjustment for the display device according to the parameter of the image and a preset parameter threshold comprises:
When the image brightness is less than or equal to the corresponding preset parameter threshold, determining the speed of adjusting the backlight brightness of the display device as a third speed,
alternatively, the first and second electrodes may be,
and when the image brightness is greater than the corresponding preset parameter threshold, determining that the speed of adjusting the backlight brightness of the display device is a fourth speed, wherein the fourth speed is less than the third speed.
4. A system for adjusting backlight brightness, the system comprising:
The image processing unit is used for acquiring parameters of the image, wherein the parameters comprise one or more of image change rate, chromaticity proportion, spatial resolution and image brightness; wherein the image change rate is determined by a frame rate at which the display device displays the image;
the speed adjusting unit is used for determining the speed of adjusting the backlight brightness of the display device according to the parameters of the image and preset parameter thresholds, wherein the preset parameter thresholds correspond to the parameters of the image and comprise one or more of an image change rate threshold, a chromaticity proportion threshold, a spatial resolution threshold and an image brightness threshold;
The sensing unit is used for acquiring an ambient luminosity value of the image;
The speed adjusting unit is further configured to determine target brightness for adjusting backlight brightness of the display device according to the ambient luminosity value of the image obtained by the sensing unit and the image parameter obtained by the image processing unit; and adjusting the backlight brightness of the display device to the target brightness according to the determined speed of the backlight brightness adjustment of the display device.
5. The system according to claim 4, wherein the speed adjustment unit is specifically configured to, when the parameter is one of image rate of change, chroma ratio, spatial resolution,
When the parameter is greater than or equal to the corresponding preset parameter threshold value, determining the speed of adjusting the backlight brightness of the display device as a first speed;
And when the parameter is smaller than the corresponding preset parameter threshold value, determining the speed of adjusting the backlight brightness of the display device as a second speed, wherein the second speed is smaller than the first speed.
6. The system according to claim 4, wherein the speed adjustment unit is in particular adapted to, when the parameter is image brightness,
when the image brightness is less than or equal to the corresponding preset parameter threshold, determining the speed of adjusting the backlight brightness of the display device as a third speed,
Alternatively, the first and second electrodes may be,
And when the image brightness is greater than the corresponding preset parameter threshold, determining that the speed of adjusting the backlight brightness of the display device is a fourth speed, wherein the fourth speed is less than the third speed.
7. A terminal for adjusting backlight brightness, the terminal comprising:
A display for displaying an image;
a sensor for acquiring an ambient luminosity value;
A memory and one or more programs, wherein the one or more programs are stored in the memory;
A processor for executing the one or more programs to perform the methods of claims 1-3.
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