CN115691385A - Display screen brightness adjusting method, device and system and storage medium - Google Patents
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Abstract
The application provides a display screen brightness adjusting method, a display screen brightness adjusting device, a display screen brightness adjusting system and a storage medium, wherein the display screen brightness adjusting method comprises the steps of obtaining a space environment illumination state, wherein the space environment illumination state comprises a shot image obtained by image processing, and current environment illumination obtained by calibrating the environment illumination according to the shot image; and determining the target brightness of the display screen according to the current ambient illumination. The embodiment of the specification unifies the illumination basis of the shot image and the current environment illumination obtained by calibrating the environment illumination, specifically associates through the image pixels, can accurately obtain the current environment illumination of the space environment, and further realizes the adjustment of a no-difference display screen. No matter the current system of vehicle is adopted to face any illumination environment, more accurate display screen brightness adjustment is realized based on unified illumination basis, and the precision of display screen brightness adjustment is promoted. Hardware equipment does not need to be additionally arranged, the adjustment complexity is reduced, and the adjustment cost is saved.
Description
Technical Field
The application relates to the technical field of computer processing, in particular to a display screen brightness adjusting method, device and system and a storage medium.
Background
At present, most of vehicle-mounted interior decorations adopt a display screen for information interaction, and the brightness of the display screen influences the eyesight of drivers and passengers. The human eye is very sensitive to light illumination and, in the case of bright ambient light, reduces the light flux by constricting the pupil. Otherwise, the pupil is enlarged to increase the amount of light entering.
At present, various illumination environments are met in the vehicle-mounted process, and although the brightness of the display screen can be automatically adjusted, the requirement that the eyes of people are comfortable can not be met by properly adjusting the display screen. For example, when the vehicle is carried at a high speed, the eyes and pupils of a person are adjusted to be dizzy due to the adjustment of the ambient light and the transient brightness of the display screen.
Therefore, a new display screen brightness adjustment scheme is needed.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a method, an apparatus, a system, and a storage medium for adjusting brightness of a display screen, which are used in a brightness adjustment process of a vehicle-mounted display screen.
The embodiment of the specification provides the following technical scheme:
the embodiment of the specification provides a display screen brightness adjusting method, which comprises the following steps:
acquiring a space environment illumination state; the space environment illumination state comprises a shot image obtained by image processing and current environment illumination obtained by calibrating the environment illumination according to the shot image;
and determining the target brightness of the display screen according to the current environment illumination.
The embodiment of this specification still provides a display screen brightness control device, display screen brightness control device includes:
the acquisition module is used for acquiring the illumination state of the space environment; the space environment illumination state comprises a shot image obtained by image processing and current environment illumination obtained by calibrating the environment illumination according to the shot image;
and the determining module is used for determining the target brightness of the display screen according to the current environment illumination.
The embodiment of the specification further provides a display screen brightness adjusting system which comprises a driver monitoring system and a passenger monitoring system, wherein the driver monitoring system is used for detecting whether a driver wears sunglasses in a space environment; the passenger monitoring system is used for determining the target brightness of the display screen according to the illumination state of the space environment and obtaining the final brightness corresponding to the display screen by combining the state of wearing sunglasses existing in the space environment;
the display screen brightness adjusting system comprises a memory, a processor and a computer program, wherein the computer program is stored in the memory, and the processor runs the computer program to execute the display screen brightness adjusting method in any technical scheme of the embodiment of the specification.
The embodiments of the present specification further provide a readable storage medium, where a computer program is stored in the readable storage medium, and the computer program is used to implement the method for adjusting brightness of a display screen according to any one of the technical solutions in the embodiments of the present specification when executed by a processor.
Compared with the prior art, the embodiment of the specification adopts at least one technical scheme which can achieve the beneficial effects that at least:
the shot image and the current environment illumination obtained by calibrating the environment illumination are unified on the basis of illumination, and specifically, the shot image and the current environment illumination are associated through image pixels, so that the current environment illumination of the space environment can be accurately acquired, and stepless display screen adjustment is realized. No matter the current vehicle system is adopted to face any illumination environment, more accurate display screen brightness adjustment is realized based on unified illumination basis, the precision of the display screen brightness adjustment is improved, hardware equipment does not need to be added, the complexity of the display screen adjustment is reduced, and the adjustment cost is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic layout diagram of an OMS and DMS system in an embodiment of the present disclosure;
FIG. 2 is a first flowchart of a display screen brightness adjustment provided by an embodiment of the present disclosure;
fig. 3 is a flowchart for acquiring an illuminance state of a space environment according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a calibration module provided in an embodiment of the present description;
FIG. 5 is a B-L plot provided in an embodiment of the present disclosure;
FIG. 6 is an rgbir spectral response curve and application diagram provided in the embodiments of the present disclosure;
FIG. 7 is a second flowchart of the brightness adjustment of the display screen according to the embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a display screen brightness adjusting device provided in an embodiment of the present specification;
fig. 9 is a schematic structural diagram of a display screen brightness adjustment system provided in an embodiment of the present specification.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
The following embodiments of the present application are described by specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The application is capable of other and different embodiments and its several details are capable of modifications and various changes in detail without departing from the spirit of the application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number and aspects set forth herein. In addition, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to or other than one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details.
When the vehicle-mounted process meets various illumination environments, although the brightness of the display screen can be automatically adjusted, the requirement that the eyes of people are comfortable can not be met by properly adjusting the display screen. For example, when the vehicle is carried at a high speed, the eyes and pupils of a person are adjusted to be dizzy due to the transient brightness adjustment of the ambient light and the display screen, or the eyes cannot perceive the discomfort due to the transient brightness adjustment to cause accidents, and the like.
Although ambient light can be collected by a photosensor at present, or by a common rgb image sensor exclusively. These approaches require additional hardware support, not only increasing engineering complexity, but also increasing regulatory costs. In addition, the photoelectric sensor can only sense light locally and cannot accurately obtain the ambient brightness, and the ordinary rgb image sensor is poor in precision when the light is dark and is very easy to be shielded by mistake, so that the inaccuracy of brightness adjustment is caused, and the corresponding brightness adjustment of the display screen cannot be made according to whether a driver wears sunglasses or not.
Based on this, the embodiment of this specification proposes a display screen brightness adjustment scheme: the shot image and the current environment illumination obtained by calibrating the environment illumination are unified on the basis of illumination, association is specifically carried out through image pixels, the current environment illumination of the space environment can be accurately obtained, stepless display screen adjustment is achieved, and accurate guiding significance can be provided for subsequent adjustment of the brightness of the display screen based on the unified illumination basis no matter in any illumination environment, namely more accurate brightness adjustment of the display screen is achieved. Especially, the adjusting precision when the ambient light is dark is improved, and the precision of adjusting the brightness of the display screen is improved. If when the driver wears the sunglasses, effectively solve the filtration of sunglasses to light, improve the regulation precision when ambient light is dark, promote the precision of display screen brightness control. Hardware equipment does not need to be additionally arranged, the complexity of display screen adjustment is reduced, and the adjustment cost is saved.
The technical solutions provided by the embodiments of the present application are described below with reference to the accompanying drawings.
The setup of the onboard hardware in the embodiment of the present specification is referred to fig. 1. The intelligent cockpit comprises a most basic Driver Monitoring System (DMS) and a passenger Monitoring System (OMS). And a video camera of the DMS is arranged at the right front of the driver, and is used for detecting and analyzing the state of the driver in real time. And a video camera of the OMS is arranged at the position above the B column, and is provided with a wide-angle lens, so that the wide-angle lens can monitor passengers, and simultaneously, the wide FOV is utilized, and the angle is adjusted to enable the wide-angle lens to comprise a central control screen area, and the wide-angle lens occupies more than 15 percent of the central control screen area.
In some embodiments, a Driver Monitoring System (DMS) is used to detect whether a driver wears sunglasses in a space environment. And the passenger monitoring system (OMS) is used for determining the target brightness of the display screen according to the illumination state of the space environment and obtaining the final brightness corresponding to the display screen by combining the state of wearing sunglasses in the space environment.
As shown in fig. 2, an embodiment of the present disclosure provides a display screen brightness adjusting method, which may include steps S210 to S220. Step S210, acquiring the illumination state of the space environment; the space environment illumination state comprises a shot image obtained by image processing and current environment illumination obtained by calibrating the environment illumination according to the shot image copper drum. And step S220, determining the target brightness of the display screen according to the current environment illumination.
Step S210, acquiring a space environment illumination state; the space environment illumination state comprises a shot image obtained by image processing and current environment illumination obtained by calibrating the environment illumination according to the shot image.
Specifically, the spatial environment illumination state assists in determining the brightness of a display screen in the spatial environment, which includes a captured image obtained by image processing and the current environment illumination obtained by calibrating the environment illumination according to the captured image. Wherein the current ambient illumination is used to determine the brightness of the display screen. The shooting image and the current environment illumination are respectively corresponding to a shooting module for collecting the environment illumination and a calibration module for calibrating the environment illumination.
In some embodiments, the capture module includes an OMS video camera and employs an rgbir image sensor that receives both visible light and infrared light.
In some embodiments, the calibration module for calibrating the ambient illumination mainly includes an integrating sphere light source, a sensor module, a camera image collector, a PC, and the like, see fig. 4.
The method includes the steps that a shooting module carries out image processing to obtain shooting images, in the process of obtaining the shooting images, shooting modes are distinguished according to ambient light, and therefore the shooting images closer to ambient illumination are obtained.
And step S220, determining the target brightness of the display screen according to the current environment illumination.
With the above embodiment, the target brightness Dt of the display screen is determined by using the obtained current ambient illuminance Bc based on the unification of the illumination basis in the image shooting process and the process of calibrating the ambient illuminance to obtain the current ambient illuminance.
The embodiment of the specification has the advantages that the shot image and the current environment illumination obtained by calibrating the environment illumination have the unified illumination basis, the current environment illumination of the space environment can be accurately obtained, stepless display screen adjustment is realized, and the accurate guiding significance can be provided for the subsequent adjustment of the brightness of the display screen on the basis of the unified illumination basis no matter which faces any illumination environment, namely more accurate display screen brightness adjustment is realized. Especially, the adjusting precision when the ambient light is dark is improved, and the precision of adjusting the brightness of the display screen is improved. The display screen brightness of the embodiment of the specification can be accurately adjusted without additionally arranging hardware equipment, for example, by adopting video image processing systems such as an OMS (operation management system) and a DMS (digital display system) of an intelligent vehicle cabin, so that the equipment cost is saved, and the difficulty and the complexity of adjustment are reduced.
In some embodiments, the image processing to obtain the captured image includes obtaining a capture mode according to the spatial environment visible light and obtaining the captured image according to the capture mode; wherein the photographing mode includes a black-and-white mode and a color mode.
Specifically, the OMS video camera adopts an rgbir image sensor, the sensor can receive visible light and infrared light, the sensing curve of the sensor is shown in fig. six, the working state of the sensor can be divided into two modes, as shown in fig. 3, the visible light illumination condition in some wavelength ranges is good, and the video image can better detect and identify the state of passengers in the cabin in a color mode. In this mode, it is necessary to acquire image data after an ir (Infrared Radiation) component in an image is removed by a combination algorithm. I.e. this mode is a color mode. Visible light in some wavelength ranges is relatively low, in order to increase sensitization, the infrared led starts light supplement, and the OMS video camera operates to acquire image data, wherein the mode is a black and white mode.
When the spatial environment image is acquired, the image is respectively set to be in a black-and-white mode or a color mode according to the difference of the ambient background basic light to photograph, so that the ambient background basic illumination intensity can be unified with the subsequent ambient cursor timing based on the image pixel value, and therefore the photographed image corresponding to the spatial environment can be acquired more accurately, and more accurate display screen brightness adjustment is realized. Some embodiments of the spatial environment include a cabin environment.
In some embodiments, the method for adjusting the brightness of the display screen further comprises obtaining a calibration mode by calibrating the ambient illumination, wherein the calibration mode comprises a black-and-white mode and a color mode, and corresponds to a calibration curve with calibration parameters; and determining a corresponding target shooting image and a target calibration curve when the calibration mode is consistent with the shooting mode.
The environment illumination is specifically calibrated by adopting the calibration module. The sensor works under the preset integrating sphere environment illumination to record the recording brightness value (B) of the brightness meter and collects the recording brightness value (B) through the camera image collector, such as the average pixel value (P) of the image and the corresponding calibration parameters of the camera sensor, such as the exposure time (T), the gain (G) and the like. And calculating to obtain a calibration score value L by adopting a formula I.
L = P/(T G) formula one
In some embodiments, a calibration evaluation value is obtained according to the calibration parameters, and a calibration mode is obtained based on the calibration evaluation value and the calibration record brightness value. Specifically, a series of corresponding data can be obtained by adjusting the illuminance in the integrating sphere, and a relative calibration curve is fitted by the recorded brightness value B of the ambient illuminance and the calibration evaluation value L, as shown in fig. 5. A large amount of data research is carried out to obtain basic background illumination corresponding to an image in a shooting cabin, the basic background illumination can be divided into two working modes through the fitting of B and L, and then the calibration mode is divided into a color mode and a black-and-white mode, and the two calibration modes respectively correspond to a B-L calibration curve.
Therefore, as shown in fig. 3 in conjunction with the above embodiment, when the shooting mode is consistent with the calibration mode, a uniform basic background illumination can be established to obtain a target shot image and a target calibration curve corresponding to the calibration process. Not only promote the accuracy that the image was shot to the space environment among the shooting process, still promote the accuracy of demarcating the space environment illuminance, and then promote the regulation precision to display screen luminance among the space environment.
In some embodiments, obtaining the current ambient illumination from the captured image by calibrating the ambient illumination includes:
and according to the target shooting image, combining the calibration parameters to obtain the current environment illumination in the target calibration curve.
Specifically, the current ambient illuminance Bc needs to be obtained according to the first formula and the target calibration curve. Wherein, the display screen area in the OMS image data is used as ROI (region of interest), and the average pixel value (P) is calculated. And according to the exposure time (T) and the gain setting (G) of the OMS camera, further calculating according to a formula I to obtain an absolute calibration evaluation value Lc, and obtaining the current ambient illumination Bc through a target calibration curve in a corresponding calibration mode.
In some embodiments, the display screen brightness adjusting method further comprises: detecting whether a driver in the space environment wears sunglasses or not; and if the space environment has the state of wearing sunglasses, obtaining the final brightness based on the target brightness allocation.
Specifically, the video camera of the DMS is directed at the driver and detects and analyzes the state of the driver in real time by an AI algorithm, including whether the driver wears sunglasses, whether the driver is tired, whether the driver is concentrated, and the like. Combine above-mentioned embodiment DMS video camera to whether wear sunglasses to driver detection and analysis, if the driver wears sunglasses, if the vehicle process of traveling if the ambient light intensity change is short and the vehicle speed of traveling when fast, for the comfort level of guaranteeing driver's eyes and prevent unexpected emergence etc. need carry out accurate discernment to ambient light intensity, provide the display screen light of suitable luminance for driver etc..
In some embodiments, if the time of the environmental illumination change is very short, for example, the change is smaller than the change such as the contraction of a human eye through hole, etc., the brightness adjustment method of the display screen in any technical scheme of the specification needs to be adopted to ensure the comfort of human eyes and the driving safety, etc.
If the present embodiment is lower at current environment illuminance, and when personnel worn the sunglasses state, need further adjust the target luminance of display screen according to the sunglasses to the state of sunglasses is worn to the adaptation, the adjustment accuracy when especially improving ambient light darker promotes the precision of display screen brightness control.
In some embodiments, deriving the final brightness based on the target brightness adjustment comprises: and correcting the target brightness according to the filtering parameters of the sunglasses to obtain the final brightness.
Specifically, in combination with whether the driver wears sunglasses, an adjustable distribution coefficient alpha (if the alpha is 1 when the sunglasses are not worn and the coefficient alpha is greater than 1 when the sunglasses are worn) can be superimposed on the target brightness Dt corresponding to the display screen, especially for the case of wearing the sunglasses, the filter index of the sunglasses to light is adapted, the final brightness Df of the display screen is finally obtained, and the screen brightness is smoothly adjusted to the final brightness Df step by step.
In some embodiments, the display screen may further include electronic devices held by the hands of the passenger, and if the passenger wears sunglasses to perform an interaction process through the display screens of the electronic devices, the above display screen brightness adjustment method is also adopted to ensure comfort of human eyes, and the like.
Some embodiments refer to fig. 7, the adjustment of the brightness of the display screen is realized by using an OMS and DMS system of the vehicle intelligent cabin, specifically, a shot image is obtained by an OMS camera; acquiring the current environment illumination, and determining the current environment illumination based on calibration parameters such as average pixel values of shot images; and then the brightness of the corresponding target of the display screen after correction is obtained according to the current ambient illumination. And identifying whether the driver wears the sunglasses or not through the DMS, if yes, adjusting the final brightness of the display screen according to a preset system, and further smoothly adjusting the final brightness step by step to enable the display screen to present the final brightness.
As shown in fig. 8, the display screen brightness adjusting apparatus 80 according to the embodiment of the present disclosure may include: an obtaining module 81, configured to obtain a spatial environment illumination state; the space environment illumination state comprises a shot image obtained by image processing and current environment illumination obtained by calibrating the environment illumination according to the shot image;
and the determining module 82 is configured to determine the target brightness of the display screen according to the current ambient illumination.
The apparatus in the embodiment shown in fig. 8 can be correspondingly used to perform the steps in the method embodiment shown in fig. 2, and the implementation principle and technical effect are similar, which are not described herein again.
In conjunction with the above-described embodiment, as shown in fig. 9, the data acquisition system 90 includes: a processor 91, memory 92 and computer programs; wherein
A memory 92 for storing the computer program, which may also be a flash memory (flash). The computer program is, for example, an application program, a functional module, or the like that implements the above method.
A processor 91 for executing the computer program stored in the memory to implement the steps performed by the apparatus in the above method. Reference may be made in particular to the description relating to the preceding method embodiment.
Alternatively, the memory 92 may be separate or integrated with the processor 91.
When the memory 92 is a device independent of the processor 91, the apparatus may further include:
a bus 93 for connecting the memory 92 and the processor 91.
The present invention also provides a readable storage medium, in which a computer program is stored, and the computer program is used for implementing the method provided by the above-mentioned various embodiments when being executed by a processor.
The readable storage medium may be a computer storage medium or a communication medium. Communication media includes any medium that facilitates transfer of a computer program from one place to another. Computer storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, a readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Additionally, the ASIC may reside in user equipment. Of course, the processor and the readable storage medium may also reside as discrete components in a communication device. The readable storage medium may be read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like.
The present invention also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the device may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the device to implement the methods provided by the various embodiments described above.
In the above embodiments of the apparatus, it should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose processors, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of hardware and software modules.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the product embodiments described later, since they correspond to the method, the description is simple, and the relevant points can be referred to the partial description of the system embodiments.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A display screen brightness adjusting method is characterized by comprising the following steps:
acquiring a space environment illumination state; the space environment illumination state comprises a shot image obtained by image processing and current environment illumination obtained by calibrating the environment illumination according to the shot image;
and determining the target brightness of the display screen according to the current environment illumination.
2. The display screen brightness adjustment method according to claim 1, wherein the image processing obtains a captured image, and comprises:
obtaining a shooting mode according to the visible light of the space environment, and obtaining a shot image according to the shooting mode; wherein the photographing mode includes a black-and-white mode and a color mode.
3. The display screen brightness adjustment method according to claim 2, further comprising:
obtaining a calibration mode by calibrating the ambient illumination, wherein the calibration mode comprises a black-and-white mode and a color mode and corresponds to a calibration curve with calibration parameters;
and determining a corresponding target shooting image and a target calibration curve when the calibration mode is consistent with the shooting mode.
4. The method for adjusting the brightness of the display screen according to claim 3, wherein obtaining the current ambient illumination by calibrating the ambient illumination according to the captured image comprises:
and obtaining the current environment illumination in the target calibration curve according to the target shooting image and in combination with the calibration parameters.
5. The display screen brightness adjustment method according to claim 1, further comprising:
detecting whether a driver in the space environment wears sunglasses or not;
and if the space environment has a sunglasses wearing state, obtaining the final brightness based on the target brightness allocation.
6. The method for adjusting brightness of a display screen according to claim 5, wherein obtaining a final brightness based on the target brightness adjustment comprises:
and correcting the target brightness according to the filtering parameters of the sunglasses to obtain the final brightness.
7. The method for adjusting brightness of a display screen according to claim 3, wherein the obtaining of the calibration mode by calibrating the ambient illumination comprises:
and obtaining a calibration evaluation value according to the calibration parameter, and obtaining a calibration mode based on a calibration record brightness value and the calibration evaluation value.
8. A display screen brightness adjusting device, characterized in that, the display screen brightness adjusting device includes:
the acquisition module is used for acquiring the illumination state of the space environment; the space environment illumination state comprises a shot image obtained by image processing and current environment illumination obtained by calibrating the environment illumination according to the shot image;
and the determining module is used for determining the target brightness of the display screen according to the current environment illumination.
9. A display screen brightness adjustment system, comprising: the driver monitoring system is used for detecting whether a driver wears sunglasses in a space environment; the passenger monitoring system is used for determining the target brightness of the display screen according to the illumination state of the space environment and obtaining the final brightness corresponding to the display screen by combining the state of wearing sunglasses existing in the space environment;
the display screen brightness adjusting system comprises a memory, a processor and a computer program, wherein the computer program is stored in the memory, and the processor runs the computer program to execute the display screen brightness adjusting method in claim 1.
10. A readable storage medium, in which a computer program is stored, which, when being executed by a processor, is configured to implement the display screen brightness adjustment method according to any one of claims 1 to 7.
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