CN107111992A - The method and terminal of a kind of adjusting backlight luminance - Google Patents

Abstract

The present embodiments relate to a kind of method of adjusting backlight luminance and terminal, methods described includes：The parameter of image is obtained, wherein, parameter includes one or more of image change rate, colourity ratio, spatial resolution and brightness of image；According to the parameter of image and parameter preset threshold value, it is determined that the speed of the backlight illumination regulation to display device, one or more of wherein, parameter preset threshold value is corresponding with the parameter of image, including image change rate threshold value, colourity proportion threshold value, spatial resolution threshold value and brightness of image threshold value.By obtaining the parameter of image, and the speed for determining to adjust the backlight illumination of image according to the parameter of image.The object brightness of the backlight illumination of regulation display device is determined according to external environment condition shading value and the parameter of image, the backlight illumination regulation of image is arrived by object brightness according to the governing speed of determination.One suitable governing speed, can avoid user from seeing backlight flicker, simultaneously, additionally it is possible to the display effect of image is reached most preferably.

Description

A method and terminal for adjusting backlight brightness technical field

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

Background technique

In the era of smart phones, LCD display effect and standby time have increasingly become the focus of attention of smart phones. LCD backlight brightness is closely related to 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, with low contrast and poor visibility; when the brightness of the LCD backlight is too high, Although the display effect is not bad, it is more harmful to the eyes, and the power consumption is very large, which affects the use time of the smart phone.

In addition, LCD is a passive light-emitting display, and the display effect of LCD content is also related to the brightness of the environment. In the sun, the brightness of the LCD backlight must be adjusted to a high level in order to have a certain degree of visibility and the display content will be clear; Indoors, the LCD backlight only needs a relatively low brightness to obtain good visibility, and the displayed content is very clear.

The environment in which users use smart phones is often changeable. It may be in the evening or at noon, indoors or outdoors. , the smart phone needs to make corresponding adjustments according to the environment, but during the adjustment process, if the range is too large, the user will find flickering, if the adjustment speed is too slow, the brightness cannot keep up with the changes in the environment, and uniform visibility cannot be achieved Effect.

Contents of the invention

The embodiment of the present invention provides a method and system for adjusting the brightness of the backlight, by acquiring image parameters, and determining the speed of adjusting the brightness of the backlight of the image according to the parameters of the image. According to the external environment The photometric value and the parameters of the image determine the target brightness for adjusting the brightness of the backlight of the display device, and the brightness of the backlight of the image is adjusted to the target brightness according to the determined adjustment speed. An appropriate adjustment speed can prevent the user from seeing the flickering of the backlight, and at the same time, can also achieve the best display effect of the image.

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

The parameters of the image are acquired, and the parameters may include one or more of image change rate, chromaticity ratio, spatial resolution, and image brightness.

Determine the speed of adjusting the backlight brightness of the display device according to the parameters of the image and the preset parameter threshold, wherein the preset parameter threshold corresponds to the parameters of the image, including the image change rate threshold, chromaticity ratio threshold, spatial resolution threshold and One or more of the image brightness thresholds.

When the parameter meets the preset parameter threshold, determine the adjustment speed of the backlight brightness of the display device, and automatically adjust the backlight brightness of the display device according to the adjustment speed, which can prevent the user from seeing the backlight flickering, and can also make the display effect of the image in any case. can achieve the best.

With reference to the first aspect, in the first possible implementation of the first aspect, if the parameter is one of the image change rate, color contrast ratio and spatial resolution, according to the image parameter and the preset parameter threshold, determine The speed of adjusting the brightness of the backlight of the display device, including:

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

On the contrary, when the parameter is less than the corresponding preset parameter threshold, it is determined that the speed of adjusting the brightness of the backlight of the display device is the second speed, and the second speed is smaller than the first speed.

When the parameter is one of the image change rate, chromaticity ratio and spatial resolution, and when the parameter is greater than the preset parameter threshold, adjusting the backlight brightness of the display device faster can achieve the best image display effect faster At the same time, it can prevent the user from seeing the backlight flickering, 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 flickering.

With reference to the first aspect, in a second possible implementation of the first aspect, if the image parameter is image brightness, the speed of adjusting the backlight brightness of the display device is determined 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, confirm Setting the speed of adjusting the brightness of the backlight of the display device as the third speed,

or,

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

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

In combination with any possible implementation manner of the first aspect to the second possible implementation manner of the first aspect, in the third possible implementation manner of the first aspect, when there are multiple image parameters to be acquired, and When each parameter satisfies the preset parameter threshold corresponding to the parameter, the adjustment speed needs to be determined according to the actual situation. In this way, the user is prevented from seeing the backlight flickering, and the image can achieve the best display effect.

With reference to any possible implementation manner of the first aspect to the second possible implementation manner of the first aspect, in the fourth possible implementation manner of the first aspect, before acquiring the parameters of the image, the method further include:

Obtain the ambient luminance value of the image; and determine the target brightness for adjusting the backlight brightness of the display device according to the current ambient luminance value and image parameters of the image, and adjust the display device according to the determined speed of the backlight brightness adjustment of the display device Adjust the brightness of the backlight to the target brightness.

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

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

The speed adjustment unit is used to determine the speed of adjusting the backlight brightness of the display device according to the parameters of the image and the preset parameter threshold, wherein the preset parameter threshold corresponds to the parameters of the image, including the image change rate threshold and the chromaticity ratio threshold , one of the spatial resolution threshold and the image brightness threshold or Multiple.

When the parameter satisfies the preset parameter threshold, the speed adjustment unit can determine the speed of adjusting the brightness of the backlight of the display device. Automatically adjusting the backlight brightness of the display device according to the determined backlight brightness adjustment speed can prevent the user from seeing the backlight flickering, and at the same time can make the display effect of the image reach the best under any circumstances.

With reference to the second aspect, in the first possible implementation of the second aspect, when the parameter is one of image change rate, chromaticity ratio, and spatial resolution, the speed adjustment unit is specifically used to:

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

On the contrary, when the parameter is less than the corresponding preset parameter threshold, it is determined that the speed of adjusting the brightness of the backlight of the display device is the second speed, and the second speed is smaller than the first speed.

When the parameter is one of the image change rate, chromaticity ratio and 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 at a faster speed, so that The image display effect reaches the optimum faster, and at the same time, it can prevent the user from seeing the backlight flickering. 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 flickering.

With reference to the second aspect, in a second possible implementation of the second aspect, if the image parameter is image brightness, the speed adjustment unit is specifically configured to: when the image brightness is less than or equal to the corresponding preset parameter threshold, determine The speed of adjusting the brightness of the backlight of the display device is the third speed,

or,

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

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

In combination with any possible implementation of the second aspect to the second possible implementation of the second aspect, in the third possible implementation of the second aspect, when the image parameters acquired by the image processing unit are more than , and each parameter satisfies the preset parameter threshold corresponding to the parameter, the speed adjustment unit will determine the adjustment speed according to the actual situation. In this way, the user is prevented from seeing the backlight flickering, and the image can be displayed with the best display effect as far as possible.

With reference to any 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 device further includes:

The sensing unit is used to obtain the ambient luminance value of the image; the speed adjustment unit is also used to determine the speed of the display device according to the current ambient luminosity value of the image obtained by the sensing unit and the image parameters obtained by the image processing unit. The target brightness of the backlight brightness adjustment; adjust the backlight brightness of the display device to the target brightness according to the determined adjustment speed of the backlight brightness of the display device.

In a third aspect, an embodiment of the present invention provides a terminal, including:

A display for displaying images; a sensor for acquiring ambient luminosity values; a processor, a memory and one or more programs, wherein the one or more programs are stored in the memory, and the processor runs the one or more programs A method for adjusting the brightness of the backlight introduced in the first aspect is implemented.

Based on the above technical solution, the embodiment of the present invention provides a method for adjusting the brightness of the backlight. The adjustment speed is determined according to the parameters of the image, and the target brightness of the backlight brightness adjustment of the display device is determined according to the current ambient light value and image parameters of the image. , adjust the brightness of the backlight of the display device to the target brightness according to the adjustment speed. An appropriate adjustment speed can prevent the user from seeing the flickering of the backlight, and at the same time, can also achieve the best display effect of the image.

Description of drawings

FIG. 1 is a system architecture diagram for adjusting the brightness of a backlight provided by Embodiment 1 of the present invention;

FIG. 2 is a schematic flow chart of adjusting the brightness of the backlight provided by Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a system for adjusting the brightness of a backlight provided by Embodiment 3 of the present invention;

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

detailed description

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Since the environment of the user when using the smart device is often changeable, 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 prevent the user from seeing the backlight flicker during the adjustment process, an appropriate speed can be determined to adjust the backlight brightness according to the light intensity value of the current environment and image parameters, and the backlight brightness of the image can be quickly adjusted to the target brightness value according to the adjustment speed. In the present invention, a system for adjusting the brightness of the backlight is provided, so that the display effect of the image seen by the user in different environments can basically reach the best state.

In order to make it easier for readers to understand the technical solution of the present invention, here is a brief introduction to several image parameters that appear in the present invention:

The image change rate, as the name suggests, can be understood as the change rate of the image at different moments. The detection of the image change rate 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 fast. Low and dynamic images, the frame rate of the image will be high. The specific method for measuring the image change rate has been introduced in detail below, and will not be repeated 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 chroma and saturation of the color. The hue ratio is the hue ratio and saturation ratio of the color.

Spatial resolution refers to the minimum limit of the spatial geometric length of the critical object recognizable in the image, That is, the resolution of fine structures.

Image brightness refers to the lightness and darkness of the image.

In the following, the preset parameter threshold is a threshold corresponding to the parameters in the image, for example, the threshold of spatial resolution of the image is 3Mhz, and the threshold of brightness of the image is 20nit. It should be understood that when there are multiple image parameters, naturally there are also multiple preset parameter thresholds for the image, at least including thresholds corresponding to the image parameters one-to-one.

FIG. 1 is a system architecture diagram 100 for adjusting the brightness of a backlight provided by Embodiment 1 of the present invention. As shown in Figure 1, the system structure includes: application processor 110, data transmission interface 120, LCD integrated circuit (LCD Integrated circuit, referred to as LCD IC) module 130, light sensor 140, memory controller (Master Control Unit, referred to as MCU ) 150 and a backlight driver IC 160.

The application processor 110 is connected with the LCD IC 130 through the data transmission interface 120. The application processor 110 transmits a frame of image to the LCD IC 130 through the data transmission interface 120. The LCD IC 130 includes an image processing module, which is used to traverse and scan the image, obtain parameters including the image, and store the parameters in a memory in the image processing module. The parameter may include one or more of image change rate, chromaticity 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. Wherein, the output result may be a pulse width modulation (Pulse Width Modulation, PWM for short) signal or a value of a duty ratio of the PWM signal.

Whether the image processing module outputs the PWM signal or the value of the duty cycle of the output and the PWM signal, the purpose is to use the value of the duty cycle of the PWM signal in the MCU150 to perform corresponding calculations. Therefore, regardless of the output form, here No limit.

In the present invention, for simplicity of description, the image processing module is described by taking a CABC module as an example. Any actions performed by the following CABC modules can be said to be a method performed 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 methods will not be illustrated here one by one, and will not be limited in any way.

The light sensor 140 is connected with the MCU 150 , and the MCU 150 will read the ambient light value in the light sensor 140 . The MCU150 mainly includes an ambient light detection corresponding to a backlight control (LightAdaptive Brightness Control, referred to as LABC) module and a backlight condition management module. The duty cycle value of the PWM signal corresponding to the current backlight brightness of the display device is used to determine the target brightness of the backlight brightness of the display device. It should be noted that when the output of the CABC module is a PWM signal, the LABC module can calculate its duty cycle value according to the PWM signal, and then perform corresponding calculations with the ambient light 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 according to the parameters stored in the register, determine the adjustment speed when adjusting the backlight brightness, that is, the backlight condition management module will use 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. If the brightness of the backlight of the display device is immediately adjusted to the target brightness, obvious backlight flicker will occur. Therefore, in order to prevent the user from seeing the flickering of the backlight, an appropriate adjustment speed is determined according to the parameters of the image, and the brightness of the backlight 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, there may be multiple parameters, and the adjustment speed of the brightness of the backlight of the image is determined according to the multiple parameters and the corresponding preset parameter thresholds. 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 should be determined according to the actual situation. The speed determined at this time may be smaller than the speed when the two alone meet the conditions, or between the speeds when the two alone meet the conditions, or greater than the two. The two speeds when the conditions are met individually.

The system for adjusting the brightness of the backlight provided by the embodiment of the present invention first acquires the parameters of the image, determines the speed of adjusting the brightness of the backlight of the image according to the parameters of the image, and then determines and adjusts the brightness of the backlight according to the current ambient light value of the image and the parameters of the image The target brightness of the image will be adjusted according to the adjustment speed The brightness of the backlight is gradually adjusted to the target brightness. When adjusting the backlight with an appropriate adjustment speed, the user can avoid seeing the backlight flicker. At the same time, the display effect of the image can be optimized.

Fig. 2 is a flow chart 200 of a method for adjusting the brightness of the backlight provided by 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 , the backlight is adjusted in detail. The brightness process is as follows:

S210, acquiring image parameters.

Specifically, the application processor 110 transmits a frame of image to the LCD IC 130 through the data transmission interface 120, and the CABC module in the LCD IC 130 traverses and scans the image to obtain image parameters. The image parameters include one or more of image change rate, chromaticity ratio, spatial resolution, and image brightness.

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

Specifically, after the CABC module traverses and scans the image, it will automatically adjust the backlight brightness of the image according to the parameters of the image.

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

It should be understood that whether it is outputting the PWM signal or the value of the duty cycle of the output and the PWM signal, the purpose is to use the value of the duty cycle of the PWM signal in the MCU150 to make a corresponding budget. Therefore, regardless of the output form, here No limit.

S230. Acquire the ambient luminosity value where the image is currently located.

Specifically, the light sensor 140 acquires the luminosity value of the environment where the image is currently located, and transmits it to the LABC module of the MCU 150 . So that the LABC module transmits the ambient light value according to the light sensor 140, and the PWM signal generated by the CABC module in step 220 or the directly output PWM The duty cycle value of the signal determines the target brightness for adjusting the brightness of the backlight of the display device.

In step 220, if the output of the CABC module is a PWM signal, then the LABC module needs to calculate the duty cycle value of the PWM signal. Then, the target brightness of the display device is determined by using the duty cycle value of the PWM signal and the current ambient light value of the image, which is mainly obtained through multiplication.

Specifically, the ambient light value is acquired through the LABC module and an ambient light sensor. For example, the current ambient light 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 light value. , which is defined as the second backlight brightness. The first backlight brightness and the second backlight brightness are multiplied to obtain the final target brightness value.

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

It can be known from step 210 that 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 parameters of the image, and may include one or more of an image change rate threshold, a chromaticity ratio threshold, a spatial resolution threshold, and an image brightness threshold.

The backlight condition management module obtains the above-mentioned parameters from the memory of the CABC module, and determines the speed of adjusting the brightness of the backlight of the display device according to the parameters and the corresponding preset parameter thresholds.

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

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

When the parameter is smaller than the corresponding preset parameter threshold, it is determined that the speed of adjusting the brightness of the backlight of the display device is the second speed, wherein the second speed is smaller than the first speed.

For example, the parameter is the rate of change of the image. When the rate of change of the image is large, it means that there is a moving object in the image or the image has a large change, which can attract the follower movement of the eyeball. When the backlight condition tube When the processing module detects that the image change rate is greater than or equal to the corresponding image change rate threshold, the first speed is used to adjust the backlight brightness of the display device; The second speed adjusts the brightness of the backlight of the display device.

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

Determine the adjustment speed of the backlight brightness of the display device according to the image change rate, and gradually adjust the backlight brightness of the display device according to the determined adjustment speed, thereby preventing the user from seeing the backlight flicker when dimming.

The detection of the image change rate can be determined according to the frame rate refresh rule of the terminal device that acquires the image. For example, if an image is acquired by a mobile phone, if the acquired image is a static image, the frame rate of the image will be very low at this time; The frame rate of the acquired dynamic image will be very high, and at the same time, the change rate of the PWM signal obtained according to the dynamic image information will also be very large, so it can be concluded that the change rate of the dynamic image is very 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 change rate of the PWM signal.

However, using this method to detect the rate of change of the image, because the CABC method is used during the detection, when the CABC module acquires the image, the pixels of each row in the image have been traversed and counted, so when calculating the frame rate, it is no longer necessary Scanning and computing are repeated on the entire image, which greatly reduces the difficulty of detection.

It should be understood that the statistics of the image change rate can also be realized in other ways, and the present invention is only an example to illustrate the realization way of obtaining by the CABC method, and other implementation ways are not limited here.

In another case, according to the characteristics of the human eye, the spatial resolution of the human eye for luminance signals is greater than that for chrominance signals. When the proportion of the chroma component in the picture 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 the chromaticity ratio, and when the chromaticity ratio is greater than or equal to the corresponding chromaticity ratio threshold, the first speed can be used to adjust the brightness of the backlight of the display device; on the contrary, when the chromaticity ratio is smaller than the chromaticity ratio threshold When the ratio threshold is set, the brightness of the backlight of the display device is adjusted at the second speed, and similarly, the second speed is lower 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 speed The speed can be set to 24nit/s. At this time, it is also possible to prevent the user from seeing the flickering phenomenon of the backlight when dimming.

In another case, human eyes are not sensitive to edge gray level errors because the human eye easily senses the change of the edge position. When the spatial resolution of the image reaches a certain level, the human eye observes more edges of the spatial resolution, but is not sensitive to the grayscale of the image.

Therefore, the spatial resolution can be used to determine the speed of adjusting the brightness of the backlight, that is, 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 first speed can be used to determine the speed of the display device. The backlight brightness is adjusted; and when the spatial resolution of the image is smaller than the spatial resolution threshold, the second speed is used to adjust the backlight brightness of the display device.

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 flickering phenomenon of the backlight when dimming.

In another case, when the overall brightness of the image is lower than a certain level, due to the masking effect, the flickering range is reduced, which can prevent the user from seeing the backlight flickering to a certain extent. Therefore, it is also possible The brightness of the image is used to determine the speed at which the backlight 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 corresponding image brightness threshold, the third speed can be used to adjust the backlight brightness of the display device; and when the brightness of the image is greater than the image brightness threshold , the brightness of the backlight of the display device can be adjusted at a fourth speed, wherein the fourth speed is lower than the third speed.

For example, when the brightness of the image is less than or equal to 20nit, the backlight adjustment speed can be set to 50nit/s, and when the image brightness is greater than 20nit, the backlight adjustment speed can be set to 25nit/s.

S250. Gradually adjust the current backlight brightness of the display device to the target brightness according to the determined adjustment speed of the backlight brightness of the display device.

Specifically, it can be known from Embodiment 1 that the backlight condition management module can store the target brightness. Therefore, the backlight condition management module can adjust the previously stored backlight brightness value (previously stored target brightness value) 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 brightness value of the backlight will be output, so that the PWM signal can be converted into a current for driving the backlight.

For example, the backlight brightness value of the previously stored image is 60%, and the target brightness value is 50%, and the adjustment speed is 2% at each moment, that is to say, at the first moment, the backlight brightness is adjusted to 58%, Then the backlight brightness value 58% is converted into a corresponding PWM signal, which is input into the backlight driving IC 160 for driving the backlight. At the next moment, after the current backlight brightness value of 58% is adjusted to 56%, the backlight brightness value of 56% is also converted into a corresponding PWM signal, which is input into the backlight driving IC 160 for driving the backlight. By analogy, slowly adjust the brightness of the backlight to the target brightness value and input it into the backlight driver IC.

It should be noted that when the speed of adjusting the brightness of the backlight of the display device is determined according to the parameters, the number of parameters may also be multiple, and when there are multiple parameters, for example, when the parameters are the change rate of the image and the chromaticity ratio, If the change rate of the image is greater than 60% and the chromaticity ratio 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 When the speed is greater than 60%, the speed is 55nit/s, and when the chromaticity ratio is less than 80%, the speed is between 24nit/s.

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

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

Similarly, when the parameters are the image change rate, the chromaticity ratio of the image, and the brightness of the image, it is also necessary to determine an appropriate speed of adjusting the backlight according to the three when meeting the corresponding preset parameter thresholds, so that the terminal device Reduce the flickering range of the backlight when automatically adjusting the backlight, so as to prevent the user from seeing the flickering of the backlight and achieve the best display effect of the image.

The method for adjusting the brightness of the backlight provided by the embodiment of the present invention obtains the parameters of the image, determines the speed of adjusting the brightness of the backlight of the display device according to the parameters of the image, and then determines the adjustment of the backlight according to the current ambient luminosity value of the image and the image parameters. The target brightness of the brightness is to gradually adjust the brightness of the backlight of the display device to the target brightness according to the adjustment speed. When adjusting the backlight with an appropriate adjustment speed, the user can avoid seeing the backlight flicker. At the same time, the display effect of the image can be optimized.

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

An image processing unit 301, configured to acquire image parameters.

Specifically, the image processing unit 301 traverses and scans the image to acquire image parameters. Wherein, the parameters include one or more of image change rate, chromaticity ratio, spatial resolution and image brightness.

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

Specifically, 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 parameters of the image, including one or more of the image change rate threshold, the chromaticity ratio threshold, the spatial resolution threshold and the image brightness threshold.

In one case, when the parameter is one of image change rate, chromaticity ratio, and 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 adjusting the brightness of the backlight of the display device is the first speed;

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

The speed adjustment unit 302 determines the speed of adjusting the brightness of the backlight of the display device according to the image parameters and the predetermined parameter threshold. The specific process can refer to the content of step 230 in the second embodiment, and will not be repeated here.

In addition, the device further includes a sensing unit 303, configured to acquire an ambient luminosity value where the image is located.

The speed adjustment unit 302 is also used to determine the target brightness for adjusting the backlight brightness of the display device according to the ambient luminosity value of the image obtained by the sensing unit and the image parameters obtained by the image processing unit; The determined speed of adjusting the brightness of the backlight of the display device is used to adjust the brightness of the backlight of the display device to the target brightness.

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

The sensing unit 303 acquires that the current ambient luminance value of the image is 0.7, and at this time, the backlight brightness of the display device can be adjusted to a backlight luminance value corresponding to the ambient luminance value, that is, the second backlight luminance value, for example, 70%. .

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

After the speed adjustment unit 302 determines the target brightness value this time, it will adjust the previously stored backlight brightness value (previously stored target brightness value) 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 brightness value of the backlight, so as to convert the PWM signal into a current for driving the backlight.

For example, the backlight brightness value of the previously stored image is 60%, and the target brightness value is 50%, and the adjustment speed is 2% at each moment, that is to say, at the first moment, the backlight brightness is adjusted to 58%, Then the backlight brightness value 58% is converted into a corresponding PWM signal, so that the PWM signal is converted into a current for driving the backlight. At the next moment, after adjusting the current backlight brightness value of 58% to 56%, the backlight brightness value of 56% is also converted into a corresponding PWM signal, so that it can be converted into a current for driving the backlight. By analogy, slowly adjust the brightness of the backlight to the target brightness value, and convert 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 parameters may also be multiple, and when there are multiple parameters, for example, the parameters are the change rate and color of the image. When the chromaticity ratio is used, 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 as 35 nit/s. The speed at this time is Between the speed of 55nit/s when the image change rate is greater than 60%, and the speed of 24nit/s when the chromaticity ratio is less than 80%.

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

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

Similarly, when the parameters are the image change rate, the chromaticity ratio of the image, and the brightness of the image, it is also necessary to determine an appropriate speed of adjusting the backlight according to the three when meeting the corresponding preset parameter thresholds, so that the terminal device Reduce the flickering range of the backlight when automatically adjusting the backlight, so as to prevent the user from seeing the flickering of the backlight and achieve the best display effect of the image.

In the system for adjusting the brightness of the backlight provided by the embodiment of the present invention, the parameters of the image are acquired by the image processing unit, and the speed of adjusting the brightness of the backlight of the display device is determined according to the parameters of the image, and then according to the current ambient luminosity value and image parameters of the image, The target brightness for adjusting the brightness of the backlight is determined, and the speed adjustment unit gradually adjusts the brightness of the backlight of the display device to the target brightness according to the adjustment speed. When adjusting the backlight with an appropriate adjustment speed, the user can avoid seeing the backlight flicker. At the same time, the display effect of the image can be optimized.

FIG. 4 is a schematic structural diagram of a terminal for adjusting backlight brightness provided by Embodiment 4 of the present invention. As shown in FIG. 4 , the terminal includes a display 401 for displaying images; a sensor 402 for acquiring ambient light values; a processor 403, memory 404 and one or more programs, wherein the one or more programs are stored in the memory, and the processor runs the one or more programs to execute the method of adjusting the brightness of the backlight described in Embodiment 2 method. Concrete method step can refer to embodiment two, I won't go into details here.

Professionals should further realize that the units and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the relationship between hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

The steps of the methods or algorithms described in connection with the embodiments disclosed herein may be implemented by hardware, software modules executed by a processor, or a combination of both. Software modules can be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other Any other known storage medium.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (9)

1. A kind of method of adjusting backlight luminance, which comprises

   Obtain the parameter of image, wherein the parameter includes one or more of image change rate, coloration ratio, spatial resolution and brightness of image；

   According to the parameter of described image and parameter preset threshold value, determine the speed adjusted to the backlight illumination of display device, the parameter preset threshold value is corresponding with the parameter of described image, including one or more of image change rate threshold value, coloration proportion threshold value, spatial resolution threshold value and brightness of image threshold value.
2. According to the method for claim 1, it is characterized in that, when the parameter is image change rate, coloration ratio, one in spatial resolution, the parameter and parameter preset threshold value according to described image determines that the speed adjusted to the backlight illumination of display device includes:

   When the parameter is more than or equal to corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of the display device is First Speed；

   When the parameter is less than corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of the display device is second speed, wherein the second speed is less than the First Speed.
3. The method according to claim 1, wherein when the parameter is brightness of image, the parameter and parameter preset threshold value according to described image determines the speed adjusted to the backlight illumination of display device, comprising:

   When described image brightness is less than or equal to corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of the display device is third speed,

   Alternatively,

   When described image brightness is greater than corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of the display device is fourth speed, wherein the fourth speed is less than the third speed.
4. Method according to any one of claim 1-3, which is characterized in that after the parameter for obtaining described image, the method also includes:

   Obtain ambient light value locating for described image；

   The parameter of ambient light value and described image according to locating for described image is determined to display device The object brightness that backlight illumination is adjusted；

   According to the speed that the backlight illumination of the determining display device is adjusted, the backlight illumination of the display device is adjusted to the object brightness.
5. A kind of device of adjusting backlight luminance, the system comprises:

   Image processing unit, for obtaining the parameter of image, wherein the parameter includes one or more of image change rate, coloration ratio, spatial resolution and brightness of image；

   Speed regulation unit, for the parameter and parameter preset threshold value according to described image, determine the speed adjusted to the backlight illumination of display device, the parameter preset threshold value is corresponding with the parameter of described image, including one or more of image change rate threshold value, coloration proportion threshold value, spatial resolution threshold value and brightness of image threshold value.
6. System according to claim 5, which is characterized in that when the parameter is image change rate, coloration ratio, one in spatial resolution, the speed regulation unit is specifically used for,

   When the parameter is more than or equal to corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of display device is First Speed；

   When the parameter is less than corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of the display device is second speed, wherein the second speed is less than the First Speed.
7. System according to claim 5, which is characterized in that when the parameter is brightness of image, the speed regulation unit is specifically used for,

   When described image brightness is less than or equal to corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of the display device is third speed,

   Alternatively,

   When described image brightness is greater than corresponding parameter preset threshold value, determine that the speed adjusted to the backlight illumination of the display device is fourth speed, wherein the fourth speed is less than the third speed.
8. The system according to any one of claim 5-7, which is characterized in that the system also includes sensing unit,

   The sensing unit, for obtaining ambient light value locating for described image；

   The speed regulation unit is also used to the image parameter of the ambient light value according to locating for the described image of sensing unit acquisition and the acquisition of described image processing unit, determines the object brightness adjusted to the backlight illumination of the display device；According to the speed that the backlight illumination of the determining display device is adjusted, the backlight illumination of the display device is adjusted to the object brightness.
9. A kind of terminal of adjusting backlight luminance, the system comprises:

   Display, for showing image；

   Sensor, for obtaining ambient light value；

   Memory and one or more programs, wherein the storage of one or more of programs is in the memory；

   Processor requires method described in 1-4 for running one or more of program execution benefits.