WO2017113343A1

WO2017113343A1 - Method for adjusting backlight brightness and terminal

Info

Publication number: WO2017113343A1
Application number: PCT/CN2015/100220
Authority: WO
Inventors: 郭玉华; 钟光华
Original assignee: 华为技术有限公司
Priority date: 2015-12-31
Filing date: 2015-12-31
Publication date: 2017-07-06
Also published as: CN107111992B; CN107111992A

Abstract

The embodiments of the present invention relate to a method for adjusting backlight brightness and a terminal. The method comprises: acquiring a parameter of an image, wherein the parameter comprises one or more of an image change rate, a chrominance ratio, a spatial resolution and image brightness; according to the parameter of the image and a pre-set parameter threshold value, determining the speed for adjusting backlight brightness of a display device, wherein the pre-set parameter threshold value corresponds to the parameter of the image and comprises one or more of an image change rate threshold value, a chrominance ratio threshold value, a spatial resolution threshold value and an image brightness threshold value; by acquiring the parameter of the image, determining the speed for adjusting the backlight brightness of the image according to the parameter of the image; and according to a luminance value of an external environment and the parameter of the image, determining a target brightness where the backlight brightness of the display device is to be adjusted, and according to the determined adjustment speed, adjusting the backlight brightness of the image to the target brightness. By means of a suitable adjustment speed, a user can be prevented from seeing a backlight flicker, and at the same time, the best display effect of an image can be achieved.

Description

Method and terminal for adjusting backlight brightness

Technical field

The present invention relates to the field of liquid crystal display technologies, and in particular, to a method and a terminal for adjusting brightness of a backlight.

Background technique

In the era of smart phones, the display effect and standby time of LCDs have become the focus of attention of smart phones. The brightness of the LCD backlight is closely related to the display effect and power consumption. When the brightness of the LCD backlight is appropriate, the display capability of the LCD can be fully utilized; however, when the brightness of the LCD backlight is too low, the display content of the LCD will become dim, the contrast is low, and the visibility is poor; when the brightness of the LCD backlight is too high, Although the display effect is not bad, but the eye damage is relatively large, and the power consumption is very large, affecting the use time of the smart machine.

In addition, the LCD is a passively illuminated display screen. The LCD content display effect is also related to the brightness of the environment. In the sun, the brightness of the LCD backlight must be adjusted to a high degree in order to have a certain degree of visibility, and the display content will be clear; In the indoor, the LCD backlight only needs a darker brightness to get a good visibility, and the display content is very clear.

The environment in which the user uses the smart phone is often changeable. In the evening or at noon, indoors or outdoors, the environment changes every moment, in order to obtain uniform visibility when the user uses the smart machine, the display effect The smart machine needs to make corresponding adjustment according to the environment, but in the process of adjustment, if the amplitude is too large, the user will find the flicker. If the adjustment speed is too slow, the brightness cannot keep up with the change of the environment, and the uniform visibility is not achieved. Effect.

Summary of the invention

Embodiments of the present invention provide a method and system for adjusting backlight brightness by acquiring parameters of an image and determining a speed of backlight brightness adjustment of the image according to parameters of the image. According to the external environment The luminosity value and the parameters of the image determine a target brightness that adjusts the backlight brightness of the display device, and adjusts the backlight brightness of the image to the target brightness according to the determined adjustment speed. A suitable adjustment speed prevents the user from seeing the backlight flicker and at the same time optimizes the image display.

In a first aspect, the present invention provides a method of adjusting brightness of a backlight, the method comprising:

Acquiring parameters of the image, which may include one or more of image change rate, chroma scale, spatial resolution, and image brightness.

Determining a speed of backlight brightness adjustment of the display device according to the parameter of the image and the preset parameter threshold, wherein the preset parameter threshold corresponds to an image parameter, including an image change rate threshold, a chroma scale threshold, a spatial resolution threshold, and One or more of the image brightness thresholds.

When the parameter satisfies the preset parameter threshold, the speed of the backlight brightness adjustment of the display device is determined, and the backlight brightness of the display device is automatically adjusted according to the adjustment speed, which can prevent the user from seeing the backlight flicker, and can also make the image display effect under any circumstances. Can achieve the best.

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 according to the parameter of the image and the preset parameter threshold The speed of backlight brightness adjustment for display devices, including:

When the parameter is greater than or equal to the corresponding preset parameter threshold, determining that the speed of backlight brightness adjustment of the display device is the first speed;

Conversely, when the parameter is less than the corresponding preset parameter threshold, it is determined that the speed of the backlight brightness adjustment of the display device is the second speed, and the second speed is less than the first speed.

When the parameter is one of image change rate, chromaticity ratio and spatial resolution, and when the parameter is greater than the preset parameter threshold, the backlight brightness of the display device can be adjusted faster, and the image display effect can be maximized faster. Good, at the same time, to avoid the user seeing the backlight flicker, and when the parameter is less than the preset parameter threshold, it is necessary to slow down the adjustment speed 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 backlight brightness adjustment of the display device according to the image parameter and the preset parameter threshold, including : When the image brightness is less than or equal to the corresponding preset parameter threshold, The speed of backlight brightness adjustment of the display device is the third speed,

or,

When the image brightness is greater than the corresponding preset parameter threshold, it is determined that the speed of the backlight brightness adjustment of the display device is the fourth speed, wherein the fourth speed is less than the third speed.

Similar to the previous embodiment, the difference is that the parameter is the brightness of the image. When the brightness of the image is greater than or equal to the preset parameter threshold corresponding to it, the brightness of the backlight needs to be adjusted at a slow speed, so as to prevent the user from seeing the backlight flicker. When the brightness of the image is less than or equal to the preset parameter threshold corresponding to it, it can be used at a slightly faster speed to achieve the best image effect faster.

With reference to any one of the possible implementations of the first aspect to the second possible implementation of the first aspect, in a third possible implementation manner of the first aspect, when the obtained image parameters are multiple, and When each parameter meets the preset parameter threshold corresponding to the parameter, the adjustment speed needs to be determined according to the actual situation. Thereby, the user is prevented from seeing the backlight flickering, and the image is optimally displayed.

In conjunction with the first possible implementation of the first aspect to the second possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the method further include:

Obtaining an ambient luminosity value of the image; and determining a target brightness of the backlight brightness adjustment of the display device according to the ambient luminosity value and the image parameter currently in the image, and displaying the device according to the determined speed of the backlight brightness adjustment of the display device The backlight brightness is adjusted to the target brightness.

In a second aspect, an embodiment of the present invention provides an apparatus for adjusting brightness of a backlight, the apparatus comprising:

An image processing unit is configured to acquire a parameter of the image, and the parameter may include one or more of an image change rate, a chromaticity ratio, a spatial resolution, and an image brightness.

a speed adjustment unit, configured to determine a speed of backlight brightness adjustment of the display device according to the parameter of the image and the preset parameter threshold, wherein the preset parameter threshold corresponds to the parameter of the image, including an image change rate threshold, a chromaticity ratio threshold One of a spatial resolution threshold and an image brightness threshold or Multiple.

When the parameter satisfies the preset parameter threshold, the speed adjustment unit can determine the speed of the backlight brightness adjustment of the display device. The backlight brightness of the display device is automatically adjusted according to the determined speed of the backlight brightness adjustment, which can prevent the user from seeing the backlight flicker, and can also make the image display effect optimal under any circumstances.

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 chroma ratio, and a spatial resolution, the speed adjustment unit is specifically configured to:

When the parameter is one of an image change rate, a chromaticity ratio, and a spatial resolution, and when the parameter is greater than the preset parameter threshold, the speed adjustment unit can adjust the backlight brightness of the display device with a faster speed, thereby The image display is faster and optimal, and the user can avoid the backlight flashing. When the parameter is less than the preset parameter threshold, the speed adjustment unit needs to slow down the adjustment speed as much as possible, so that the user cannot see 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 the 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, determine The speed of backlight brightness adjustment of the display device is the third speed,

or,

With reference to any one of the possible implementations of the second aspect to the second possible implementation of the second aspect, in a third possible implementation manner of the second aspect, when the image processing unit acquires the image parameter When each parameter satisfies the preset parameter threshold corresponding to the parameter, the speed adjustment unit determines the adjustment speed according to the actual situation. This prevents the user from seeing the backlight flickering and tries to get the best possible display of the image.

In conjunction with the second possible implementation of the second aspect to the second possible implementation of the second aspect, in a fourth possible implementation of the second aspect, the apparatus further includes:

a sensing unit, configured to acquire an ambient photometric value of the image; the speed adjusting unit is further configured to determine, according to an ambient photometric value currently acquired by the image obtained by the sensing unit and an image parameter acquired by the image processing unit, The target brightness of the backlight brightness adjustment; 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 photometric value; a processor, a memory, and one or more programs, wherein the one or more programs are stored in the memory, the processor running one or more programs A method of adjusting backlight brightness as described in the first aspect is performed.

Based on the above technical solution, a method for adjusting brightness of a backlight according to an embodiment of the present invention determines an adjustment speed according to parameters of an image, and determines a target brightness of backlight brightness adjustment of the display device according to an ambient photometric value and an image parameter currently in the image. Adjust the backlight brightness of the display device to the target brightness according to the adjustment speed. A suitable adjustment speed prevents the user from seeing the backlight flicker and at the same time optimizes the display of the image.

DRAWINGS

FIG. 1 is a schematic structural diagram of a system for adjusting brightness of a backlight according to Embodiment 1 of the present invention; FIG.

2 is a schematic flowchart of adjusting brightness of a backlight according to Embodiment 2 of the present invention;

3 is a schematic structural diagram of a system for adjusting brightness of a backlight according to Embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram of a system for adjusting brightness of a backlight according to Embodiment 4 of the present invention.

detailed description

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments.

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Since the environment of the user is often changed when using the smart device, in order to obtain a unified display effect, the smart device must make corresponding adjustments according to changes in the environment. In order to prevent the user from seeing the backlight flicker during the adjustment process, a suitable speed can be determined according to the current ambient light intensity value and the image parameter to adjust the backlight brightness, and the backlight brightness of the image is quickly adjusted to the target brightness value according to the adjustment speed. In the present invention, a system for adjusting the brightness of a backlight is provided, so that the display effect of the image seen by the user in different environments can be basically achieved in an optimal state.

In order to facilitate the reader's technical solution of the present invention which is easier to understand, for the several image parameters appearing in the present invention, a brief introduction is first made here:

The image change rate, as the name implies, can be understood as the rate of change of the image at different times. The detection rate of the image can be determined according to the frame rate refresh rule of the terminal device that acquires the image. For a static image, the frame rate of the image will be very high. Low, while dynamic images, the frame rate of the image will be very high. The specific method of measuring the image change rate has been described in detail below, and will not be described again here.

The chromaticity ratio, the color is represented by the chromaticity and the brightness, and the chromaticity is the property of the color not including the brightness, which reflects the chromaticity and saturation of the color. The chromaticity ratio is also the chromaticity ratio and saturation ratio of the color.

Spatial resolution refers to the minimum limit of the geometric length of the identifiable critical object space in the image. That is, the resolution of the fine structure.

Image brightness refers to the brightness of the picture.

In the following, the preset parameter threshold, that is, a threshold value corresponding to the parameters in the image, for example, the spatial resolution threshold of the image is 3Mhz, and the brightness threshold of the image is 20nit. It should be understood that when there are multiple parameters of the image, it is natural that the preset parameter thresholds of the image are naturally plural, and at least the threshold values corresponding to the parameters of the image are included.

FIG. 1 is a system architecture diagram 100 for adjusting backlight brightness according to a first embodiment of the present invention. As shown in FIG. 1 , the system structure includes: an application processor 110, a data transmission interface 120, an LCD integrated circuit (LCD IC) module 130, an optical sensor 140, and a memory controller (Master Control Unit, MCU for short). 150 and the backlight driving IC 160.

The application processor 110 is coupled to the LCD IC 130 via a data transfer interface 120. The application processor 110 transmits a frame of images to the LCD IC 130 through the data transmission interface 120. The LCD IC 130 includes an image processing module for performing traversal scanning on the image, acquiring parameters including the image, and storing the parameter in a memory in the image processing module. The parameter can include one or more of image change rate, chroma scale, spatial resolution, and image brightness.

The image processing module can also 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 duty ratio of the PWM signal.

Whether the image processing module outputs the PWM signal or the value of the duty ratio of the output and the PWM signal, the purpose is to perform the corresponding operation in the MCU 150 using the value of the duty ratio of the PWM signal, so regardless of the form of the output, here Not limited.

In the present invention, for convenience of explanation, the image processing module will be described by taking a CABC module as an example. Any action performed by the following CABC module can be said to be a way of execution by the image processing module. When the image processing module is another module, the processing method may be slightly different, but the purpose to be achieved is the same, therefore, other processing The method will not be exemplified here, nor is it limited.

The light sensor 140 is coupled to the MCU 150, which will read the ambient luminosity value in the light sensor 140. The MCU 150 mainly includes a LightAdaptive Brightness Control (LABC) module and a backlight condition management module, and the LABC module is used for the current ambient luminosity value detected by the light sensor 140, and the CABC module sends the The duty value of the PWM signal corresponding to the current backlight brightness of the device is displayed to determine the target brightness of the backlight brightness of the display device. It should be noted that when the CABC module outputs a PWM signal, the LABC module can calculate its duty value according to the PWM signal, and then perform corresponding operations with the ambient luminosity value to determine the target brightness of the image backlight brightness.

The LABC module inputs the target brightness into the backlight condition management module, and the backlight condition management module is used to store the target brightness value. And determining, according to the parameters stored in the register, the adjustment speed when adjusting the brightness of the backlight, that is, the backlight condition management module converts the backlight brightness value of the image stored in the previous time (the target brightness value stored in the previous time) according to the adjustment speed determined at this time. Gradually adjust to the target brightness determined this time.

Therefore, the process of adjusting the brightness of the backlight is a gradual process, and if the backlight brightness of the display device is immediately adjusted to the target brightness, significant backlight flicker occurs. Therefore, in order to prevent the user from seeing the backlight flicker, a suitable adjustment speed is determined according to the parameters of the image, and the backlight brightness of the image is adjusted according to the adjustment speed.

It should be noted that, when determining the adjustment speed when adjusting the brightness of the backlight, the parameter may be multiple, and the adjustment speed of the backlight brightness of the image is determined according to the plurality of parameters and the preset parameter threshold corresponding thereto. For example, when the spatial resolution satisfies the spatial resolution threshold and the image brightness satisfies the image brightness threshold, the speed of backlight brightness adjustment is determined. At this time, the adjustment speed is determined according to the actual situation. The speed determined at this time may be smaller than the speed when the two conditions are separately satisfied, or between the speeds when the two conditions are separately satisfied, or greater than the two. Two speeds when the condition is met separately.

The system for adjusting the brightness of the backlight provided by the embodiment of the invention firstly acquires the parameters of the image, determines the speed of the backlight brightness adjustment of the image according to the parameters of the image, and then determines the brightness of the backlight according to the ambient luminosity value of the image and the parameters of the image. Target brightness, according to the adjustment speed will be the image The backlight brightness is gradually adjusted to the target brightness. When the backlight is adjusted with a suitable adjustment speed, the user can be prevented from seeing the backlight flicker. At the same time, the image display effect can be optimized.

FIG. 2 is a schematic flowchart diagram of a method for adjusting backlight brightness according to Embodiment 2 of the present invention. The functional steps included in the method are mainly performed by the system components introduced in Embodiment 1, as shown in FIG. 2, and the backlight is adjusted in detail. The process of brightness is as follows:

S210. Acquire image parameters.

Specifically, the application processor 110 transmits one frame of image to the LCD IC 130 through the data transmission interface 120, and the CABC module in the LCDIC 130 performs traversal scanning on the image to acquire image parameters. The image parameters include one or more of an image change rate, a chromaticity ratio, a spatial resolution, and an image brightness.

S220, generating an output result corresponding to the current backlight brightness of the image.

Specifically, after the traversal scan of the image, the CABC module automatically adjusts the backlight brightness of the image according to the parameters of the image.

In a specific example, the parameter of the acquired image, such as an image, is the image resolution, and depending on the resolution of the image, the grayscale of the image can be increased by 30%. At this time, the backlight brightness of the display device can be adjusted to 70%. After this adjustment, the image display effect is basically the same as that of the image before the unadjusted image. At this time, it is determined that the current backlight brightness of the display device is 70%, which is convenient for the following description, and is defined as the first backlight brightness. Then, the value of the duty ratio of the PWM signal or the PWM signal corresponding to the current backlight brightness of the image is output.

It should be understood that whether the output PWM signal or the value of the duty ratio of the output and the PWM signal is used, the purpose is to use the value of the duty ratio of the PWM signal in the MCU 150 to make a corresponding budget, so regardless of the form of the output, here Not limited.

S230. Acquire an ambient luminosity value at which the image is currently located.

Specifically, the photometric value of the environment in which the image is currently located is acquired by the light sensor 140 and transmitted to the LACC module of the MCU 150. In order for the LABC module to be based on the ambient photometric value transmitted by the photosensor 140, and the PWM signal generated by the CABC module in step 220 or the PWM output directly. The duty cycle value of the signal determines the target brightness for backlight brightness adjustment of the display device.

In step 220, if the CABC module outputs a PWM signal, the LABC module needs to calculate the duty cycle value of the PWM signal. Then, the target luminance of the display device is determined by using the duty ratio of the PWM signal and the ambient luminosity value at which the image is currently located, mainly by multiplication.

Specifically, the ambient photometric value is obtained by the LABC module and an ambient light sensor. For example, the current ambient photometric value obtained by the ambient light sensor is 0.7, and the LABC module can adjust the backlight brightness of the display device to 70% according to the current ambient photometric value. , which is defined as the second backlight brightness. The first backlight brightness and the second backlight brightness are multiplied to obtain a final target brightness value.

S240. Determine a speed of backlight brightness adjustment of the image according to the parameter of the image and the preset parameter threshold.

As can be seen from step 210, the parameters of the image may include one or more of image change rate, chromaticity ratio, spatial resolution, and image brightness.

The preset parameter threshold corresponds to the 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 above parameters in the memory of the CABC module, and determines the speed of backlight brightness adjustment of the display device according to the parameters and the corresponding preset parameter thresholds.

Specifically, when the parameter is one of an image change rate, a chromaticity ratio, and a spatial resolution, determining a speed of backlight brightness adjustment of the display device according to the image parameter and the corresponding preset parameter threshold, including:

When the parameter is less than the corresponding preset parameter threshold, the speed of backlight brightness adjustment to the display device is determined to be the second speed, wherein the second speed is less than the first speed.

For example, the parameter is the image change rate. When the image change rate is large, it indicates that there is a large change in the moving object or image in the image, which can attract the follow-up movement of the eyeball. When the backlight condition tube When the control module detects that the image change rate is greater than or equal to the image change rate threshold corresponding thereto, the backlight brightness of the display device is adjusted by using the first speed; and when the image conversion rate is less than the image change rate threshold, The second speed adjusts the backlight brightness of the display device.

For example, when it is detected that the image change rate is greater than or equal to 60%, the backlight conditional speed management module can set the dimming speed to 50 nit/s, and when the image change rate is detected to be less than 60%, the backlight conditional speed management module The dimming speed is set to 25 nit/s.

According to the situation of the image change rate, the adjustment 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 adjustment speed, thereby preventing the user from seeing the backlight flicker phenomenon during dimming.

The detection of the image change rate may be determined according to the frame rate refresh rule of the terminal device that acquires the image, for example, obtaining an image by using a mobile phone, and if the acquired image is a static image, the frame rate of the image will be low at this time; The frame rate of the acquired dynamic image will be high, and at the same time, the rate of change of the PWM signal acquired based on the moving image information will be large, so that the dynamic image change rate is large.

The image change rate calculation can be expressed by the following formula:

Image change rate = fps × ΔCABC_PWM

Among them, fps is the number of frames of images transmitted per second, and ΔCABC_PWM is the output rate of change of the PWM signals.

The image change rate is detected by the method. Since the CABC method is used in the detection, when the image is acquired by the CABC module, the pixels of each row in the image are traversed, so when calculating the frame rate, it is no longer needed. Repeated scanning and calculation of the entire image makes the detection less difficult.

It should be understood that the statistics of the image change rate can also be implemented in other manners. In the present invention, only one implementation manner is obtained by the CABC method, and other implementation manners are not limited herein.

In another case, depending on the characteristics of the human eye, the spatial resolution of the human eye to the luminance signal is greater than the spatial resolution of the chrominance signal. When the ratio of the chroma component to the luminance component is high, the sensitivity of the human eye will decrease, that is, when the proportion of the chroma component is high, the human eye can avoid seeing the backlight flicker.

Therefore, when the parameter is a chromaticity ratio, and when the chromaticity ratio is greater than or equal to a chromaticity ratio threshold corresponding thereto, the backlight brightness of the display device can be adjusted by using the first speed; conversely, when the chromaticity ratio is smaller than the chromaticity At the proportional threshold, the backlight brightness of the display device is adjusted using the second speed, and similarly, the second speed is 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 dimming speed can be set to 55 nit/s, and when the backlight condition management module detects that the chromaticity ratio is less than 80%, the dimming is performed. The speed can be set to 24 nit/s. At this time, it is also possible to prevent the user from seeing the backlight flickering phenomenon during dimming.

In still another case, since the human eye easily feels the change in the edge position, the grayscale error of the edge is not sensitive to the human eye. When the spatial resolution of the image reaches a certain level, the human eye observes the edge of the spatial resolution more, and is not sensitive to the grayscale of the image.

Therefore, the resolution of the space can be utilized to determine the speed at which the backlight brightness is adjusted, that is, when the parameter is spatial resolution, and when the spatial resolution of the image is greater than or equal to the spatial resolution threshold, the first speed can be used for the display device. The backlight brightness is adjusted; and when the spatial resolution of the image is less than the spatial resolution threshold, the backlight brightness of the display device is adjusted using the second speed.

For example, when the spatial resolution is greater than or equal to 3Mhz, the dimming speed can be set to 52nit/s, and when the spatial resolution is less than 3Mhz, the dimming speed can be set to 21nit/s. At this time, it is also possible to prevent the user from seeing the backlight flickering phenomenon during dimming.

In another case, when the overall brightness of the image is lower than a certain value, the amplitude of the flicker is reduced due to the effect of the masking, and the user can be prevented from seeing the backlight flicker to a certain extent. Therefore, it can also The brightness of the image is used to determine the speed at which the backlight brightness is adjusted.

That is, when the parameter is the brightness of the image, and when the brightness of the image is less than or equal to the image brightness threshold corresponding thereto, the backlight brightness of the display device may be adjusted by using the third speed; and when the brightness of the image is greater than the brightness threshold of the image The brightness of the backlight of the display device can be adjusted 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 20 nit, the speed of the backlight adjustment can be set to 50 nit/s, and when the brightness of the image is greater than 20 nit, the speed of the backlight adjustment can be set to 25 nit/s.

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 can store the target brightness. Therefore, the backlight condition management module can adjust the backlight brightness value (previously stored target brightness value) stored in the previous time to the target brightness value according to the adjustment speed determined at this time. Moreover, after each adjustment, a PWM signal corresponding to the adjusted backlight luminance value is output to convert the PWM signal into a current for driving the backlight.

For example, the image stored in the previous time has a backlight brightness value of 60%, and the target brightness value is 50%, and the adjustment speed is adjusted by 2% at each time, that is, the backlight brightness is adjusted to 58% at the first moment. The backlight luminance value of 58% is then converted into a corresponding PWM signal, which is input to the backlight driving IC 160 for driving the backlight. At the next moment, the current backlight brightness value is adjusted to 56%, and the backlight brightness value of 56% is converted into a corresponding PWM signal, which is input to the backlight driving IC 160 for driving the backlight. By analogy, the backlight brightness is slowly adjusted to the target brightness value and input to the backlight driver IC.

It should be noted that, when determining the speed of backlight brightness adjustment of the display device according to the parameter, the number of parameters may also be multiple, and when the parameter is multiple, for example, when the parameter is the change rate of the image and the chromaticity ratio, If the rate of change of the image is greater than 60% and the ratio of chromaticity is less than 80%, the backlight condition management module can determine the adjustment speed as 35 nit/s. The speed at this time is between the image change rate The speed is greater than 60% at 55 nit/s, and the speed at which the chromaticity ratio is less than 80% is between 24 nit/s.

It should be understood that determining 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 the two adjustment speeds, but an adjustment speed determined by the backlight condition management module according to the actual situation. The speed at this time may be a speed value that is faster than the adjustment speed determined according to any one of the parameters, or a slower value, or a value in between.

In short, it is necessary to determine a suitable adjustment speed according to the parameters, and reduce the amplitude of the backlight flicker when the terminal device automatically adjusts the backlight, thereby preventing the user from seeing the backlight flicker. At the same time, the image display effect is optimized.

Similarly, when the parameter is the image change rate, the chromaticity ratio of the image, and the brightness of the image, it is also determined according to the preset threshold parameter corresponding to the three, to determine a suitable speed for adjusting the backlight, so that the terminal device The backlight flicker is reduced when the backlight is automatically adjusted, thereby preventing the user from seeing the backlight flicker and optimizing the display of the image.

The method for adjusting the brightness of the backlight provided by the embodiment of the present invention determines the speed of the backlight brightness adjustment of the display device according to the parameters of the image by acquiring parameters of the image, and then determines the backlight according to the ambient luminosity value and the image parameter of the image. The target brightness of the brightness is gradually adjusted to the target brightness according to the adjustment speed. When the backlight is adjusted with a suitable adjustment speed, the user can be prevented from seeing the backlight flicker. At the same time, the image display effect can be optimized.

FIG. 3 is a schematic structural diagram of an apparatus for adjusting brightness of a backlight according to Embodiment 3 of the present invention. As shown in FIG. 3, the apparatus includes an image processing unit 301 and a speed adjusting unit 302.

The image processing unit 301 is configured to acquire parameters of the image.

Specifically, the image processing unit 301 performs traversal scanning on the image to acquire image parameters. Wherein, the parameter includes one or more of an image change rate, a chromaticity ratio, a spatial resolution, and an image brightness.

The speed adjustment unit 302 is configured to determine a speed of backlight brightness adjustment of the display device according to the parameter of the image and the preset parameter threshold.

Specifically, 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.

The preset parameter threshold corresponds to a parameter of the image, including 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 the corresponding preset parameter threshold, the speed adjustment unit 302 determines the backlight brightness of the display device. The speed of backlight brightness adjustment of the display device is the first speed;

When the parameter is less than the corresponding preset parameter threshold, the speed adjusting unit 302 determines that the speed of the backlight brightness adjustment of the backlight brightness display device of the display device is the second speed, wherein the second speed is smaller than the first speed.

In another case, when the parameter is image brightness, and when the image brightness is less than or equal to the corresponding preset parameter threshold, the speed adjustment unit 302 determines backlight brightness adjustment of the backlight brightness display device of the display device. The speed is the third speed,

or,

When the image brightness is greater than the corresponding preset parameter threshold, the speed adjusting unit 302 determines that the speed of the backlight brightness adjustment of the backlight brightness display device of the display device is the fourth speed, wherein the fourth speed is smaller than the third speed.

For example, the speed adjustment unit 302 determines the speed of the backlight brightness adjustment of the display device according to the image parameters and the predetermined parameter threshold. For details, refer to the content in step 230 in the second embodiment, and details are not described herein again.

In addition, the device further includes a sensing unit 303 for acquiring an ambient photometric value at which the image is located.

The speed adjustment unit 302 is further configured to determine, according to an ambient photometric value of the image acquired by the sensing unit and an image parameter acquired by the image processing unit, a target brightness of backlight brightness adjustment of the backlight brightness display device of the display device; The determined brightness of the backlight of the display device is adjusted to adjust the backlight brightness of the display device to the target brightness.

Specifically, the image processing unit 301 can adjust the backlight of the display device according to the acquired parameters. degree. For example, the parameter for acquiring an image is the image resolution, and depending on the resolution of the image, the grayscale of the image can be increased by 30%. At this time, the backlight brightness of the display device can be adjusted to 70%. After this adjustment, the image display effect is basically the same as that of the image before the unadjusted image. Therefore, it is determined that the first backlight luminance value of the display device is 70%.

The sensing unit 303 obtains an ambient luminosity value of 0.7, and adjusts the backlight brightness of the display device to a backlight brightness value corresponding to the ambient luminosity value, that is, a second backlight brightness value, for example, 70%. .

The speed adjusting unit 302 multiplies the first backlight brightness value and the second backlight brightness value to obtain the target brightness of the backlight brightness adjustment of the final display device, and will save the current brightness value of the backlight.

When the speed adjustment unit 302 determines the target brightness value for the current time, the previous 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. Moreover, after each adjustment, the speed adjustment unit 302 will output a PWM signal corresponding to the adjusted backlight brightness value to convert the PWM signal into a current for driving the backlight.

For example, the image stored in the previous time has a backlight brightness value of 60%, and the target brightness value is 50%, and the adjustment speed is adjusted by 2% at each time, that is, the backlight brightness is adjusted to 58% at the first moment. The backlight brightness value of 58% is then converted to a corresponding PWM signal to convert the PWM signal into a current for driving the backlight. At the next moment, the current backlight brightness value of 58% is adjusted to 56%, and the backlight brightness value of 56% is likewise converted into a corresponding PWM signal to convert it into a current for driving the backlight. By analogy, the backlight brightness is slowly adjusted to the target brightness value, and the target brightness value is converted into a current for driving the backlight.

It should be noted that, when the speed adjustment unit 302 determines the speed of the backlight brightness adjustment of the display device according to the parameter, the number of parameters may also be multiple, and when the parameter is multiple, for example, the parameter is the image change rate and color. In the case of the degree ratio, if the rate of change of the image is greater than 60% and the ratio of chromaticity is less than 80%, the speed adjusting unit 302 can determine the adjustment speed as 35 nit/s. The speed at this time is The speed is 55 nit/s when the image change rate is greater than 60%, and the speed is between 24 nit/s when the chromaticity ratio is less than 80%.

It should be understood that the speed adjustment unit 302 determines that the speed of adjusting the backlight is not a superimposed value of the two adjustment speeds according to the image change rate and the chromaticity ratio of the image, but the adjustment speed determined by the speed adjustment unit 302 according to the actual situation. The speed at this time may be a speed value that is faster than the adjustment speed determined according to any one of the parameters, or a slower value, or a value in between.

The system for adjusting the brightness of the backlight provided by the embodiment of the present invention acquires the parameters of the image through the image processing unit, determines the speed of adjusting the brightness of the backlight of the display device according to the parameters of the image, and then according to the ambient illuminance value and the image parameter of the image. The target brightness for adjusting the brightness of the backlight is determined, and the speed adjusting unit gradually adjusts the backlight brightness of the display device to the target brightness according to the adjustment speed. When the backlight is adjusted with a suitable adjustment speed, the user can be prevented from seeing the backlight flicker. At the same time, the image display effect can be optimized.

4 is a schematic structural diagram of a terminal for adjusting brightness of a backlight according to Embodiment 4 of the present invention. As shown in FIG. 4, the terminal includes a display 401 for displaying an image, and a sensor 402 for acquiring an ambient photometric value. 403. A memory 404 and one or more programs, wherein the one or more programs are stored in the memory, the processor running the one or more programs to perform the adjustment of backlight brightness as described in Embodiment 2. method. For specific method steps, refer to the second embodiment. I won't go into details here.

A person skilled in the art should further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. All modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

A method of adjusting brightness of a backlight, the method comprising:

Acquiring parameters of the image, wherein the parameters include one or more of an image change rate, a chroma ratio, a spatial resolution, and an image brightness;

Determining a speed of backlight brightness adjustment of the display device according to the parameter of the image and a preset parameter threshold, the preset parameter threshold corresponding to the parameter of the image, including an image change rate threshold, a chroma scale threshold, and a space One or more of a resolution threshold and an image brightness threshold.
The method according to claim 1, wherein when the parameter is one of an image change rate, a chromaticity ratio, and a spatial resolution, the determining the display according to the parameter of the image and the preset parameter threshold The speed of backlight brightness adjustment of the device includes:

Determining, when the parameter is greater than or equal to a corresponding preset parameter threshold, a speed of backlight brightness adjustment of the display device is a first speed;

Determining, when the parameter is less than a corresponding preset parameter threshold, a speed of backlight brightness adjustment of the display device is a second speed, wherein the second speed is less than the first speed.
The method according to claim 1, wherein when the parameter is image brightness, the determining the speed of backlight brightness adjustment of the display device according to the parameter of the image and the preset parameter threshold comprises:

Determining, when the brightness of the image is less than or equal to a corresponding preset parameter threshold, determining a speed of backlight brightness adjustment of the display device as a third speed,

or,

Determining, when the image brightness is greater than a corresponding preset parameter threshold, a speed of backlight brightness adjustment of the display device is a fourth speed, wherein the fourth speed is less than the third speed.
The method according to any one of claims 1 to 3, wherein after acquiring parameters of the image, the method further comprises:

Obtaining an ambient photometric value at which the image is located;

Determining a display device according to an ambient photometric value at which the image is located and a parameter of the image The target brightness of the backlight brightness adjustment;

The backlight brightness of the display device is adjusted to the target brightness according to the determined speed of backlight brightness adjustment of the display device.
A device for adjusting brightness of a backlight, the system comprising:

An image processing unit, configured to acquire a parameter of an image, where the parameter includes one or more of an image change rate, a chromaticity ratio, a spatial resolution, and an image brightness;

a speed adjustment unit, configured to determine a speed of backlight brightness adjustment of the display device according to the parameter of the image and a preset parameter threshold, where the preset parameter threshold corresponds to a parameter of the image, including an image change rate threshold, One or more of a chroma scale threshold, a spatial resolution threshold, and an image brightness threshold.
The system according to claim 5, wherein when the parameter is one of an image change rate, a chromaticity ratio, and a spatial resolution, the speed adjustment unit is specifically configured to:

Determining, when the parameter is greater than or equal to a corresponding preset parameter threshold, a speed of backlight brightness adjustment of the display device is a first speed;

Determining, when the parameter is less than a corresponding preset parameter threshold, a speed of backlight brightness adjustment of the display device is a second speed, wherein the second speed is less than the first speed.
The system according to claim 5, wherein when said parameter is image brightness, said speed adjusting unit is specifically configured to:

Determining, when the brightness of the image is less than or equal to a corresponding preset parameter threshold, determining a speed of backlight brightness adjustment of the display device as a third speed,

or,

Determining, when the image brightness is greater than a corresponding preset parameter threshold, a speed of backlight brightness adjustment of the display device is a fourth speed, wherein the fourth speed is less than the third speed.
A system according to any one of claims 5-7, wherein the system further comprises a sensing unit,

The sensing unit is configured to acquire an ambient photometric value at which the image is located;

The speed adjustment unit is further configured to determine a target brightness of the backlight brightness adjustment of the display device according to an ambient luminosity value of the image acquired by the sensing unit and an image parameter acquired by the image processing unit And adjusting a backlight brightness of the display device to the target brightness according to the determined speed of backlight brightness adjustment of the display device.
A terminal for adjusting brightness of a backlight, the system comprising:

a display for displaying an image;

a sensor for obtaining an ambient photometric 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 method of claims 1-4.