CN108877692B - Method and device for adjusting backlight brightness and electronic equipment - Google Patents
Method and device for adjusting backlight brightness and electronic equipment Download PDFInfo
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- CN108877692B CN108877692B CN201810770016.9A CN201810770016A CN108877692B CN 108877692 B CN108877692 B CN 108877692B CN 201810770016 A CN201810770016 A CN 201810770016A CN 108877692 B CN108877692 B CN 108877692B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2354/00—Aspects of interface with display user
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
A method and a device for adjusting backlight brightness and an electronic device are provided. The method comprises the following steps: after obtaining an ambient light illumination value through an ambient light sensor, determining a backlight brightness adjustment value corresponding to the ambient light illumination value according to a backlight brightness adjustment curve and the ambient light illumination value, wherein the backlight brightness adjustment curve is determined based on a brightness reference value and a corresponding relationship between ambient light illumination and backlight brightness; and adjusting the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value. The method can give consideration to the power consumption of the electronic equipment and the visual perception of human eyes of a user to adjust the backlight brightness of the display screen according to the ambient light illumination.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a method and an apparatus for adjusting backlight brightness, and an electronic device.
Background
The ambient light sensor is already a standard configuration of an electronic device such as a smart phone, a tablet computer, a notebook computer, a smart television, a multimedia player, etc., and one of the most important functions is to sense the light condition of the environment where the electronic device is located, notify the light condition to a processor, and automatically adjust the backlight brightness of a display based on a mapping curve of ambient light and backlight preset by an electronic device manufacturer or an application developer, thereby reducing the power consumption of a product, which is a method for saving power consumption.
In the prior art, there is no reasonable scheme for adjusting the backlight brightness of the display screen according to the ambient light illumination.
Disclosure of Invention
The embodiment of the invention provides a method and a device for adjusting backlight brightness and electronic equipment, which are used for adjusting the backlight brightness of a display screen according to ambient illuminance by taking account of power consumption of the electronic equipment and visual perception of human eyes of a user.
In a first aspect of the present invention, a method for adjusting backlight brightness is provided, including: after obtaining an ambient light illumination value through an ambient light sensor, determining a backlight brightness adjustment value corresponding to the ambient light illumination value according to a backlight brightness adjustment curve and the ambient light illumination value, wherein the backlight brightness adjustment curve is determined based on a brightness reference value and a corresponding relationship between ambient light illumination and backlight brightness; and adjusting the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value.
With reference to the first aspect, in a first possible implementation manner, before obtaining the ambient light illuminance value by the ambient light sensor, the method further includes: and obtaining the brightness reference value, and generating a backlight brightness adjusting curve based on the brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness, wherein the corresponding relation between the ambient light illumination and the backlight brightness is determined according to the sensitivity curve of human eyes to brightness.
With reference to the first aspect or the first possible implementation manner, in a second possible implementation manner, the correspondence between the ambient light illuminance and the backlight brightness is specifically obtained by: determining the sensitivity curve based on the mapping relation between the human eye brightness and the ambient light illumination; and determining the corresponding relation between the ambient light illumination and the backlight brightness based on the sensitivity curve.
With reference to the first possible implementation manner or the second possible implementation manner, in a third possible implementation manner, the sensitivity curve is obtained by the following formula:
wherein S is the sensitivity of human eyes to brightness, L is the brightness value of human eyes, Y is the ambient light illumination value, Lw is the maximum value of human eye brightness, Yw is the maximum value of ambient light illumination,
with reference to the second possible implementation manner or the third possible implementation manner, in a fourth possible implementation manner, the determining, based on the sensitivity curve, a corresponding relationship between the ambient light illuminance and the backlight brightness specifically includes: and calculating the reciprocal of the sensitivity curve to obtain the corresponding relation between the ambient light illumination and the backlight brightness.
With reference to the first aspect and any one of the first possible implementation manner to the fourth possible implementation manner, in a fifth possible implementation manner, the adjusting the backlight brightness of the display screen of the electronic device according to the backlight brightness adjustment value specifically includes: and when the backlight brightness adjusting value is larger than the brightness value corresponding to the highest brightness level of the backlight brightness, adjusting the backlight brightness of the display screen to the brightness value corresponding to the highest brightness level.
In a second aspect, an apparatus for adjusting backlight brightness is provided, including: the backlight brightness adjusting value determining module is used for determining a backlight brightness adjusting value corresponding to the ambient light illumination value according to a backlight brightness adjusting curve and the ambient light illumination value after the ambient light illumination value is obtained through an ambient light sensor, wherein the backlight brightness adjusting curve is determined based on a brightness reference value and a corresponding relation between the ambient light illumination and the backlight brightness; and the backlight adjusting module is used for adjusting the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value.
With reference to the second aspect, in a first possible implementation manner, the electronic device further includes: the backlight brightness adjusting curve generating module is configured to obtain the brightness reference value before the electronic device obtains the ambient light illuminance value through the ambient light sensor, and generate a backlight brightness adjusting curve based on the brightness reference value and a corresponding relationship between the ambient light illuminance and the backlight brightness, where the corresponding relationship between the ambient light illuminance and the backlight brightness is determined according to a sensitivity curve of human eyes to brightness.
With reference to the second aspect or the first possible implementation manner, in a second possible implementation manner, the correspondence between the ambient light illuminance and the backlight brightness is specifically obtained by: determining the sensitivity curve based on the mapping relation between the human eye brightness and the ambient light illumination; and determining the corresponding relation between the ambient light illumination and the backlight brightness based on the sensitivity curve.
With reference to the first possible implementation manner or the second possible implementation manner, in a third possible implementation manner, the sensitivity curve is obtained by the following formula:
wherein S is the sensitivity of human eyes to brightness, L is the brightness value of human eyes, Y is the ambient light illumination value, Lw is the maximum value of human eye brightness, Yw is the maximum value of ambient light illumination,
with reference to the second aspect and any one of the first possible implementation manner to the third possible implementation manner, in a fourth possible implementation manner, the backlight adjusting module is specifically configured to: and when the backlight brightness adjusting value is larger than the brightness value corresponding to the highest brightness level of the backlight brightness, adjusting the backlight brightness of the display screen to the brightness value corresponding to the highest brightness level.
In a third aspect, an electronic device is provided, including: the environment light sensor is used for acquiring the environment light illumination of the environment where the electronic equipment is located; the processor is connected with the ambient light sensor and used for determining a backlight brightness adjusting value corresponding to the ambient light illumination value according to a backlight brightness adjusting curve and the ambient light illumination value after the ambient light illumination value is obtained by the ambient light sensor; and adjusting the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value, wherein the backlight brightness adjusting curve is determined based on a brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness.
With reference to the third aspect, in a first possible implementation manner, the processor is further configured to: the method comprises the steps of obtaining a brightness reference value before the electronic equipment obtains an ambient light illumination value through an ambient light sensor, and generating a backlight brightness adjusting curve based on the brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness, wherein the corresponding relation between the ambient light illumination and the backlight brightness is determined according to a sensitivity curve of human eyes to brightness.
With reference to the third aspect or the first possible implementation manner, in a second possible implementation manner, the correspondence between the ambient light illuminance and the backlight brightness is specifically obtained by: determining the sensitivity curve based on the mapping relation between the human eye brightness and the ambient light illumination; and determining the corresponding relation between the ambient light illumination and the backlight brightness based on the sensitivity curve.
With reference to the first possible implementation manner or the second possible implementation manner, in a third possible implementation manner, the sensitivity curve is obtained by the following formula:
wherein S is the sensitivity of human eyes to brightness, L is the brightness value of human eyes, Y is the ambient light illumination value, Lw is the maximum value of human eye brightness, Yw is the maximum value of ambient light illumination,
with reference to the third aspect and any one of the first possible implementation manner to the third possible implementation manner, in a fourth possible implementation manner, the processor is specifically configured to: and when the backlight brightness adjusting value is larger than the brightness value corresponding to the highest brightness level of the brightness of the back of the display screen, adjusting the backlight brightness of the display screen to the brightness value corresponding to the highest brightness level.
The invention has the following beneficial effects:
after the ambient light illumination value is obtained through the ambient light sensor, the electronic device determines the backlight brightness adjusting value corresponding to the ambient light illumination value according to the backlight brightness adjusting curve determined based on the brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness and the ambient light illumination value, and adjusts the backlight brightness of the display screen of the electronic device according to the backlight brightness adjusting value.
Drawings
FIG. 1 is a flowchart illustrating a method for adjusting backlight brightness according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of an apparatus for adjusting backlight brightness according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a method and a device for adjusting backlight brightness and electronic equipment, which are used for adjusting the backlight brightness of a display screen according to ambient illuminance by taking account of power consumption of the electronic equipment and visual perception of human eyes of a user, and the overall idea of the solution is as follows:
after the electronic equipment obtains the ambient light illumination value through the ambient light sensor, the backlight brightness adjusting value corresponding to the ambient light illumination value is determined according to the backlight brightness adjusting curve determined based on the brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness and the ambient light illumination value, and the backlight brightness of the display screen of the electronic equipment is adjusted according to the backlight brightness adjusting value.
The following describes in detail the main implementation principle, specific implementation process and corresponding beneficial effects of the embodiments of the present invention with reference to the drawings of the specification.
The embodiment provides a method for adjusting backlight brightness, which is applied to an electronic device, where the electronic device may be a smart phone, a tablet computer, a notebook computer, a multimedia player, and the like, and each of the electronic devices includes a display screen, and the display screen may be a general liquid crystal display screen, a touch display screen, or a flexible screen, which is not limited in this application. Furthermore, the electronic device is also provided with an ambient light sensor for detecting the ambient light illumination of the environment where the electronic device is located.
The specific operation steps are shown in fig. 1 and include:
s101: after obtaining an ambient light illumination value through an ambient light sensor, determining a backlight brightness adjustment value corresponding to the ambient light illumination value according to a backlight brightness adjustment curve and the ambient light illumination value, wherein the backlight brightness adjustment curve is determined based on a brightness reference value and a corresponding relationship between ambient light illumination and backlight brightness;
s102: and adjusting the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value.
In this embodiment, the backlight brightness adjustment curve is determined before S101, and then the method may further include: and obtaining a brightness reference value, and generating a backlight brightness adjusting curve based on the brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness, wherein the corresponding relation between the ambient light illumination and the backlight brightness is determined according to the sensitivity curve of human eyes to brightness.
The brightness reference value obtained by the electronic device may be set according to the ambient light illuminance of the current environment when the user of the electronic device is actually using the electronic device, for example, the user or the electronic device calls a brightness reference value obtaining interface, at this time, the electronic device detects that the ambient light illuminance of the environment where the current user is located is h lux, and the user may set a backlight brightness value of the display screen, such as y nits, in the brightness reference value obtaining interface, where the user considers that the user is most comfortable in the current environment.
Preferably, the setting of the brightness reference value may be automatically initiated by the electronic device only when the user uses the electronic device for the first time, after which the user may make a selection change manually in the system settings of the electronic device.
Next, when the electronic device obtains the brightness reference value, the electronic device generates a backlight brightness adjustment curve for a current user of the electronic device according to a preset corresponding relationship between ambient light illuminance and backlight brightness.
It should be noted that, in practical applications, the ambient light illuminance measured by the ambient light sensor may be a luminance Y in the CIE 1931 color space (the color space standard specified by the international commission on illumination in 1931), and the backlight luminance perceived by the human eye is closer to a luminance L in the CIE Luv color space (the color space standard specified by the international commission on illumination (CIE) in 1976), then the ambient light illuminance value may be represented by Y, and the human eye luminance value may be represented by L, as shown in formula 1, the mapping relationship between Y and L is:
where Yw is the maximum value of the ambient light level, i.e., the maximum value that can be measured by the ambient light sensor.
In order to prevent the backlight brightness of the display screen perceived by the user from changing under different ambient light levels, manufacturers of electronic devices or developers of application programs obtain a sensitivity curve of human eyes to brightness, namely formula (2), according to the mapping relationship between human eye brightness and ambient light brightness shown in formula (1).
Wherein S is the sensitivity of human eyes to brightness, Lw is the maximum value of human eye brightness, that is, the maximum value of L, and Lw may be 100nits in practical application.
Combining equations (1) and (2), one can obtain:
further, based on the sensitivity curve, determining a corresponding relationship between the ambient light brightness and the backlight brightness, specifically, calculating a reciprocal of the sensitivity curve to obtain a corresponding relationship between the ambient light brightness and the backlight brightness, which is expressed by formula (3):
where Le is the backlight brightness value of the display screen.
Further, an ambient light illumination value corresponding to the luminance reference value, for example, the luminance reference value is Y nits, and the ambient light illumination value h lux corresponding to the luminance reference value is substituted into the formula (3) as a value of Y to obtain a value of the backlight luminance Le of the display screen at this time, for example, xnits, and then the backlight luminance adjustment curve Le' can be generated, that is:
namely, the curve Le is normalized, and a coordinate system with a longitudinal axis value range of 0-1 is converted into a coordinate system with a longitudinal axis value range of 0-255, so as to obtain the curve Le'.
It should be noted that, after the backlight adjustment curve is generated, the backlight adjustment curve may be stored in the electronic device for direct calling in subsequent use, and the curve does not need to be generated online again until the user changes the number of the brightness reference value or initializes the electronic device.
First, S101 is executed: after the ambient light illumination value is obtained by the ambient light sensor, a backlight brightness adjustment value corresponding to the ambient light illumination value is determined according to the backlight brightness adjustment curve and the ambient light illumination value.
Specifically, after the electronic device obtains the backlight brightness adjustment curve Le', the electronic device may determine the backlight brightness adjustment value corresponding to the ambient light illumination value according to the backlight brightness adjustment curve and the ambient light illumination value at least in detail through the following two embodiments.
In a first embodiment, the ambient light sensor may collect the ambient light illuminance value once every a period of time, such as 5s, 30s, 1min, etc., to obtain the ambient light illuminance value, such as l, and then, according to the backlight brightness adjustment curve Le ', obtain the backlight brightness adjustment value corresponding to the collected ambient light illuminance value l, such as m, that is, replace l into the curve Le ', so as to obtain Le ' ═ m, that is, the backlight brightness adjustment value.
In a second embodiment, the ambient light sensor collects an ambient light illumination value once every a period of time, such as 5s, 30s, 1min, and the like, to obtain an ambient light illumination value, such as l, and then the electronic device determines whether the ambient light illumination of the environment where the electronic device is located changes according to the values, if so, according to a backlight brightness adjustment curve Le ', a backlight brightness adjustment value corresponding to the collected ambient light illumination value l, such as m, that is, l is substituted into the curve Le ', and then Le ' ═ m, that is, a backlight brightness adjustment value, is obtained; if not, no action is taken.
Of course, in the specific implementation process, the method for determining the backlight brightness adjustment value corresponding to the ambient light illumination value is not limited to the above two embodiments, and the present application is not limited thereto.
Next, S102 is executed, that is: and adjusting the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value.
In a specific implementation process, S102 may be: the backlight luminance of the display screen of the electronic device is adjusted to the backlight luminance adjustment value obtained by S101.
Of course, in this embodiment, since the highest brightness level that can be identified by the binary code is 255, when the backlight brightness adjustment value is greater than the brightness value corresponding to the highest brightness level of the backlight brightness of the display screen, S102 may be to adjust the backlight brightness of the display screen to the brightness value corresponding to the highest brightness level.
The above scheme is illustrated below by specific examples.
Taking the electronic device as a tablet computer as an example, the formula (3) and the formula (4) may be pre-stored before the electronic device leaves the factory, when the user uses the tablet computer for the first time, the tablet computer displays a brightness reference value setting interface, the current ambient light illuminance detected by the current ambient light sensor is displayed on the interface, for example, 400lux, and the user can set the backlight brightness of the display screen considered most comfortable under the current ambient light on the brightness reference value setting interface, if the user selects 50nits and the maximum range Yw of the ambient light sensor is 10000lux, then, first, according to the current ambient light intensity Y of 400lux when the user sets the brightness reference value, the Le is 0.169nits calculated by the formula (3), then, y is 50nits, x is 0.169nits, and is substituted into the formula (4), in this way, a backlight brightness adjustment curve for the user, i.e., formula (4), can be found:
and S101, the ambient light sensor can acquire the ambient light illumination value of the environment where the tablet computer is located once every minute and bring the ambient light illumination value into the formula (4), so that the backlight brightness adjusting value can be obtained. Further, S102 is executed, i.e., the backlight brightness of the display screen is adjusted to the backlight brightness adjustment value.
Certainly, in another embodiment, the ambient light illuminance value of the environment where the tablet computer is located is collected once every minute, and whether the ambient light illuminance value is consistent with the ambient light illuminance value collected last time or is within a reasonable floating range is determined, if so, it is determined that the ambient light of the environment where the tablet computer is located has not changed, and then S102 does not need to be executed; if not, the environment light of the environment where the tablet computer is located is considered to be changed, and at the moment, the collected environment light illumination value is substituted into the formula (4), so that the backlight brightness adjusting value can be obtained. Further, S102 is executed, i.e., the backlight brightness of the display screen is adjusted to the backlight brightness adjustment value.
Further, when the backlight luminance adjustment value obtained by substituting the ambient light luminance value into the above formula (4) is 800nits and is greater than the luminance value 500nits corresponding to the highest luminance level 255 of the backlight luminance of the display panel, the backlight luminance of the display panel may be adjusted to 500 nits.
As can be seen from the above description, after the ambient light illumination value is obtained by the ambient light sensor, the electronic device determines the backlight luminance adjustment value corresponding to the ambient light illumination value according to the backlight luminance adjustment curve and the ambient light illumination value determined based on the correspondence between the luminance reference value and the ambient light illumination and the backlight luminance, and adjusts the backlight luminance of the display screen of the electronic device according to the backlight luminance adjustment value, so that the electronic device can consider both the power consumption of the electronic device and the visual sensation of the human eyes of the user to adjust the backlight luminance of the display screen according to the ambient light illumination, and further improve the user experience.
Based on the same inventive concept, in a second aspect of the present invention, there is provided an apparatus for adjusting backlight brightness, as shown in fig. 2, comprising: a backlight brightness adjustment value determining module 10, configured to determine, after an ambient light illumination value is obtained by an ambient light sensor, a backlight brightness adjustment value corresponding to the ambient light illumination value according to a backlight brightness adjustment curve and the ambient light illumination value, where the backlight brightness adjustment curve is determined based on a brightness reference value and a correspondence between ambient light illumination and backlight brightness; and the backlight adjusting module 20 is configured to adjust the backlight brightness of the display screen of the electronic device according to the backlight brightness adjusting value.
In this embodiment, the apparatus further includes: the backlight brightness adjusting curve generating module 30 is configured to obtain a brightness reference value, and generate a backlight brightness adjusting curve based on the brightness reference value and a corresponding relationship between ambient light illumination and backlight brightness, where the corresponding relationship between the ambient light illumination and the backlight brightness is determined according to a sensitivity curve of human eyes to brightness.
Specifically, the correspondence between the ambient light illuminance and the backlight luminance is obtained by the following steps: determining a sensitivity curve based on the mapping relation between the human eye brightness and the ambient light illumination; based on the sensitivity curve, a correspondence between ambient light illuminance and backlight brightness is determined.
In practical applications, the ambient light illuminance measured by the ambient light sensor is a luminance Y in the CIE 1931 color space, and the backlight luminance perceived by human eyes is closer to the luminance L in the CIE Luv color space, so that the ambient light illuminance value is represented by Y, the luminance value of human eyes is represented by L, and the mapping relationship between Y and L is shown in formula (1).
Therefore, in order to prevent the backlight brightness of the display screen perceived by the user from changing under different ambient light intensities, the manufacturer of the electronic device or the developer of the application program obtains a sensitivity curve of human eyes to brightness, i.e., formula (2), according to the mapping relationship between human eye brightness and ambient light brightness shown in formula (1), and Lw may be 100nits in practical application.
Alternatively, combining equations (1) and (2), one can obtain:
further, based on the sensitivity curve, a corresponding relationship between the ambient light brightness and the backlight brightness is determined, specifically, a reciprocal of the sensitivity curve is calculated, and the corresponding relationship between the ambient light brightness and the backlight brightness is obtained, that is, equation (3).
Further, the backlight brightness adjustment curve generation module 30 substitutes the ambient light illumination value corresponding to the brightness reference value, for example, the brightness reference value Y nits, and the ambient light illumination value h lux corresponding to the brightness reference value as the value of Y into the formula (3), to obtain the value of the backlight brightness Le of the display screen at that time, for example, xnits, and then, can generate the backlight brightness adjustment curve for the current user of the electronic device, please refer to the formula (4), that is, perform "normalization" processing on the curve, and convert the coordinate system with the longitudinal axis value range of 0-1 into the coordinate system with the longitudinal axis value range of 0-255, to obtain the backlight brightness adjustment curve.
In this embodiment, the brightness reference value may be set by a user of the electronic device in actual use according to the ambient light illumination of the current environment, for example, when the electronic device detects that the ambient light illumination of the environment where the current user is located is h lux, a brightness reference value obtaining interface is popped up for the user to set a backlight brightness value of the display screen, such as y nits, which the user thinks is most comfortable in the current environment.
Preferably, the setting of the brightness reference value is automatically initiated by the electronic device only when the user uses the electronic device for the first time, after which the user can make a selection change manually in the system settings of the electronic device.
Further, the backlight brightness adjustment value determining module 10 determines the backlight brightness adjustment value corresponding to the ambient light illumination value according to the backlight brightness adjustment curve determined by the backlight brightness adjustment curve generating module 30 and the ambient light illumination value after the electronic device obtains the ambient light illumination value through the ambient light sensor.
The ambient light illuminance value may be acquired by the ambient light sensor through at least two implementation manners described in the above one or more embodiments, and details are not repeated here.
Further, the backlight adjusting module 20 is configured to adjust the backlight brightness of the display screen of the electronic device according to the backlight brightness adjusting value determined by the backlight brightness adjusting value determining module 20.
Specifically, the backlight adjusting module 20 adjusts the backlight brightness of the display screen of the electronic device to the backlight brightness adjusting value determined by the backlight brightness adjusting value determining module 10.
In another embodiment, the backlight adjusting module 20 is further specifically configured to: and when the backlight brightness adjusting value is larger than the brightness value corresponding to the highest brightness level of the backlight brightness of the display screen, adjusting the backlight brightness of the display screen to the brightness value corresponding to the highest brightness level.
In the above embodiments, they may be combined with each other without conflict.
While the foregoing various modifications and embodiments of the method for adjusting backlight brightness in the embodiment of fig. 1 are also applicable to the terminal of the present embodiment, the implementation of the apparatus in the present embodiment will be clear to those skilled in the art from the foregoing detailed description of the method for adjusting backlight brightness, and therefore, for the brevity of the description, detailed description is omitted here.
Based on the same inventive concept, a third aspect of the present invention provides an electronic device, which may be a smart phone, a tablet computer, a notebook computer, a multimedia player, etc.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Referring to fig. 3, the electronic device includes: the ambient light sensor 301 is used for acquiring ambient light illumination of the environment where the electronic device is located; and the processor 303 is connected to the ambient light sensor 301, and configured to determine a backlight brightness adjustment value corresponding to the ambient light illumination value according to a backlight brightness adjustment curve and the ambient light illumination value after the electronic device obtains the ambient light illumination value through the ambient light sensor, and then adjust backlight brightness of a display screen of the electronic device according to the backlight brightness adjustment value, where the backlight brightness adjustment curve is determined based on the brightness reference value and a corresponding relationship between the ambient light illumination and the backlight brightness.
The electronic device may further include a memory 302 for storing a corresponding relationship between the ambient light illumination and the backlight brightness, that is, a mapping table of the ambient light illumination and the backlight brightness.
In this embodiment, the memory 302 may be a memory of the terminal, and stores a corresponding relationship between the ambient light illuminance and the backlight brightness preset by the electronic device manufacturer and the application developer, and may further store an ambient light illuminance value collected by the ambient light sensor, so that the processor 303 may read the corresponding relationship between the ambient light illuminance and the backlight brightness and the ambient light illuminance value from the memory 302. The memory 302 may also be one of NVRAM nonvolatile memory, DRAM dynamic random access memory, SRAM static random access memory, Flash memory, and the like.
In fig. 3, the processor 303 may also be connected to various other circuits such as an I/O interface 304, a display screen 305, a WiFi module 306, a radio frequency antenna 307, which are well known in the art, and therefore, will not be further described herein.
In practical applications, the display screen 305 may be a general liquid crystal display, a touch display, or a flexible screen, which is not specifically limited in this application.
Further, the processor 303 is further configured to: obtaining a brightness reference value before obtaining an ambient light illumination value through an ambient light sensor, and generating a backlight brightness adjusting curve based on the brightness reference value and a corresponding relation between ambient light illumination and backlight brightness, wherein the corresponding relation between the ambient light illumination and the backlight brightness is determined according to a sensitivity curve of human eyes to brightness.
In this embodiment, the backlight adjustment curve may be stored in the memory 302 after being generated, so as to be directly called for later use, without generating the curve online again, and the backlight adjustment curve is not generated online again until the user changes the number of the brightness reference value or initializes the electronic device.
Further, the correspondence between the ambient light illuminance and the backlight luminance is specifically obtained by: determining a sensitivity curve based on the mapping relation between the human eye brightness and the ambient light illumination; based on the sensitivity curve, a correspondence between ambient light illuminance and backlight brightness is determined.
In practical applications, the ambient light illuminance measured by the ambient light sensor is a luminance Y in the CIE 1931 color space, and the backlight luminance perceived by human eyes is closer to the luminance L in the CIE Luv color space, so that the ambient light illuminance value is represented by Y, the luminance value of human eyes is represented by L, and the mapping relationship between Y and L is shown in formula 1.
Therefore, in order to prevent the backlight brightness of the display screen perceived by the user from changing under different ambient light intensities, manufacturers of electronic devices or developers of application programs obtain a sensitivity curve of human eyes to brightness according to the mapping relationship between human eye brightness and ambient light brightness shown in the above formula (1), that is, in practical application, Lw may be 100 nits.
Alternatively, combining equations (1) and (2), one can obtain:
further, based on the sensitivity curve, a corresponding relationship between the ambient light brightness and the backlight brightness is determined, specifically, a reciprocal of the sensitivity curve is calculated, and the corresponding relationship between the ambient light brightness and the backlight brightness is obtained, that is, equation (3).
The ambient light illumination value corresponding to the brightness reference value, for example, the brightness reference value is Y nits, and the ambient light illumination value h lux corresponding to the brightness reference value is substituted into the formula (3) as the value of Y to obtain the value of the backlight brightness Le at the time, for example, xnits, and then, the backlight brightness adjustment curve can be generated, referring to the formula (4), that is, the curve is normalized, and the coordinate system with the longitudinal axis value range of 0-1 is converted into the coordinate system with the longitudinal axis value range of 0-255 to obtain the curve Le'.
Next, the processor 303 determines a backlight brightness adjustment value corresponding to the ambient light illumination value according to the backlight brightness adjustment curve and the ambient light illumination value after the electronic device obtains the ambient light illumination value through the ambient light sensor 301.
Specifically, after the electronic device obtains the backlight brightness adjustment curve Le', the electronic device may determine the backlight brightness adjustment value corresponding to the ambient light illumination value at least specifically according to the backlight brightness adjustment curve and the ambient light illumination value by at least two implementation manners described in the foregoing one or more embodiments, which is not described herein again.
Further, the processor 303 is further specifically configured to: and adjusting the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value. That is, the backlight brightness of the display screen of the electronic device is adjusted to the backlight brightness adjustment value determined by the processor 303 as described above.
Of course, in this embodiment, when the backlight brightness adjustment value is greater than the brightness value corresponding to the highest brightness level of the backlight brightness of the display screen, the backlight brightness of the display screen is adjusted to the brightness value corresponding to the highest brightness level.
In the above embodiments, they may be combined with each other without conflict.
Various changes and specific examples in the method for adjusting the backlight brightness in the embodiment of fig. 1 are also applicable to the terminal of the embodiment, and the implementation method of the electronic device in the embodiment is clear to those skilled in the art from the foregoing detailed description of the method for adjusting the backlight brightness, so that the detailed description is omitted here for the brevity of the description.
The invention has the following beneficial effects:
after the ambient light illumination value is obtained through the ambient light sensor, the electronic device determines the backlight brightness adjusting value corresponding to the ambient light illumination value according to the backlight brightness adjusting curve determined based on the brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness and the ambient light illumination value, and adjusts the backlight brightness of the display screen of the electronic device according to the backlight brightness adjusting value.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (16)
1. A method for adjusting backlight brightness is applied to an electronic device, the electronic device comprises a display screen,
characterized in that the method comprises:
the electronic equipment acquires a current first ambient light illumination value;
the electronic equipment acquires a brightness reference value;
the electronic equipment generates a backlight brightness adjusting curve according to the brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness, wherein the corresponding relation between the ambient light illumination and the backlight brightness is determined according to a sensitivity curve of human eyes to the brightness, and the sensitivity curve is determined by the sensitivity of the human eyes to the brightness, the brightness value of the human eyes, the ambient light illumination value, the maximum value of the brightness of the human eyes and the maximum value of the ambient light illumination;
the electronic equipment determines a backlight brightness adjusting value corresponding to the first ambient light illumination value according to the backlight brightness adjusting curve;
the electronic equipment adjusts the backlight brightness of the display screen of the electronic equipment according to the backlight brightness adjusting value;
the method further comprises the following steps: and the electronic equipment receives a changed brightness reference value input by a user, and regenerates a backlight brightness adjusting curve according to the changed brightness reference value and the corresponding relation between the ambient light illumination and the backlight brightness.
2. The method of claim 1, wherein the brightness reference value is set by a user via the electronic device.
3. The method of claim 1, wherein the brightness reference value is set or changed by a user in a system setting of the electronic device.
4. The method of claim 1, wherein the electronic device obtaining a brightness reference value comprises:
the electronic equipment displays a brightness reference acquisition interface;
and the electronic equipment receives the input of a user through the brightness reference acquisition interface and generates the brightness reference value.
5. The method of claim 4, wherein the electronic device generating the brightness reference value comprises:
the electronic equipment receives a first backlight brightness value set by a user through the brightness reference acquisition interface;
the electronic equipment detects a second ambient illuminance value of the current environment;
and the electronic equipment generates the brightness reference value according to the second ambient illumination value and the backlight brightness value.
6. The method of any of claims 1-4, wherein the electronic device generating a backlight brightness adjustment curve comprises: and when the electronic equipment obtains the brightness reference value, the electronic equipment generates the backlight brightness adjusting curve according to the preset corresponding relation between the ambient light illumination and the backlight brightness.
7. The method according to any one of claims 1 to 4, wherein the electronic device adjusts the backlight brightness of the display screen of the electronic device according to the backlight brightness adjustment value, specifically: and when the backlight brightness adjusting value is larger than the brightness value corresponding to the highest brightness level of the backlight brightness, adjusting the backlight brightness of the display screen to the brightness value corresponding to the highest brightness level.
8. The method of any of claims 1-4, wherein the electronic device is a cell phone.
9. An electronic device, the electronic device comprising a display screen, comprising:
the ambient light sensor is used for acquiring a current first ambient light illumination value;
a processor, connected to the ambient light sensor, configured to obtain a luminance reference value, and generate a backlight luminance adjustment curve according to the luminance reference value and a corresponding relationship between ambient light illumination and backlight luminance, where the corresponding relationship between the ambient light illumination and the backlight luminance is determined according to a sensitivity curve of human eyes to luminance, where the sensitivity curve is determined by sensitivity of human eyes to luminance, a luminance value of human eyes, an ambient light illumination value, a maximum value of human eye luminance, and a maximum value of ambient light illumination, determine a backlight luminance adjustment value corresponding to the first ambient light illumination value according to the backlight luminance adjustment curve, and adjust backlight luminance of the display screen of the electronic device according to the backlight luminance adjustment value;
the processor is further configured to obtain a changed brightness reference value input by a user, and regenerate a backlight brightness adjustment curve according to the changed brightness reference value and a corresponding relationship between the ambient light illuminance and the backlight brightness.
10. The electronic device of claim 9, wherein the display screen is to display a luminance reference acquisition interface;
the processor is further configured to generate the brightness reference value according to an input of a user through the brightness reference acquisition interface.
11. The electronic device of claim 10, wherein the display screen is further configured to receive a first backlight brightness value set by a user via the brightness reference acquisition interface;
the ambient light sensor detects a second ambient illuminance value of the current environment;
the processor generates the brightness reference value according to the second ambient light illumination value and the backlight brightness value.
12. The electronic device according to any one of claims 9-11, wherein the processor is further configured to generate the backlight brightness adjustment curve according to a preset correspondence between the ambient light illuminance and the backlight brightness when obtaining the brightness reference value.
13. The electronic device of any of claims 9-11, wherein the processor is further configured to adjust the backlight brightness of the display screen to a brightness value corresponding to a highest brightness level of the backlight brightness when the backlight brightness adjustment value is greater than the brightness value corresponding to the highest brightness level.
14. The electronic device of any of claims 9-11, wherein the electronic device is a cell phone.
15. A backlight adjustment terminal, comprising: a display screen, a processor, and a memory, wherein,
the memory is used for storing programs;
the processor is configured to invoke the program to cause the terminal to perform the method according to any one of claims 1-8.
16. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1-8.
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| CN201810770016.9A CN108877692B (en) | 2013-11-20 | 2013-11-20 | Method and device for adjusting backlight brightness and electronic equipment |
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| CN201810770016.9A CN108877692B (en) | 2013-11-20 | 2013-11-20 | Method and device for adjusting backlight brightness and electronic equipment |
| PCT/CN2013/087532 WO2015074201A1 (en) | 2013-11-20 | 2013-11-20 | Method and apparatus for regulating backlight brightness, and electronic device |
| CN201380078886.5A CN105453166B (en) | 2013-11-20 | 2013-11-20 | A kind of method, apparatus and electronic equipment of adjusting backlight luminance |
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| CN108877739B (en) | 2020-11-06 |
| CN108877692A (en) | 2018-11-23 |
| CN108877739A (en) | 2018-11-23 |
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