CN113257195A - Ambient light detection method and apparatus, electronic device, and storage medium - Google Patents
Ambient light detection method and apparatus, electronic device, and storage medium Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- 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
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- 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
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
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Abstract
The present disclosure relates to an ambient light detection method and apparatus, an electronic device, and a storage medium. An ambient light detection method comprising: when the backlight level of the backlight brightness of the display screen is detected to be within a preset backlight level range, acquiring first gray scale data collected by the optical sensor; inputting the first gray scale data into a preset influence model, and acquiring compensation data corresponding to the first gray scale data by the preset influence model; compensating the first gray scale data by using the compensation data to obtain current gray scale data; the current gray-scale data is used for representing corresponding gray-scale data when external environment light acts on the light sensor in the current state. In this embodiment, the difference of the influence of the external ambient light on each channel of the optical sensor is enlarged, so that the accuracy of the change of the detected external ambient light and the accuracy of the detected illumination intensity are improved, and the backlight of the display screen is matched with the external environment.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to an ambient light detection method and apparatus, an electronic device, and a storage medium.
Background
At present, the screen occupation ratio of a display screen in electronic equipment is getting larger and larger, so that a comprehensive screen becomes a development trend. In the case of a full-screen, various sensors (e.g., light sensors) originally located on the display screen need to be positioned below the full-screen. Taking the optical sensor as an example, after external environment light penetrates through the full-face screen, the optical sensor collects light to obtain light sensation data, and the light sensation data can be used to obtain the illumination intensity of the external environment light.
In practical applications, in the process of displaying images on the full-screen, light leakage of backlight of the full-screen is mixed into external environment light, so that an error exists in the illumination intensity obtained by the optical sensor, and therefore the light leakage needs to be accurately detected to compensate the illumination intensity. However, it is considered that the OLED display is mostly used for a full-screen, and the OLED display adopts a Pulse Width Modulation (PWM) dimming mode in a low backlight mode and a direct current dimming mode in a high backlight mode.
Taking the example of turning down the backlight of the display screen, the intensity of the backlight leakage of the display screen is reduced along with the reduction of the intensity of the external environment light. When the external environment light is small enough, the influence of the light leakage on the light sensor exceeds the influence of the external environment light on the light sensor, so that the light sensor is insensitive to the external environment light, the backlight of the display screen is kept constant, and even the backlight can not be switched to a PWM dimming mode in time, and the user experience is influenced.
Disclosure of Invention
The present disclosure provides an ambient light detection method and apparatus, an electronic device, and a storage medium to solve the disadvantages of the related art.
According to a first aspect of the embodiments of the present disclosure, there is provided an ambient light detection method applied to an electronic device in which a light sensor is disposed below a display screen, the method including:
when the backlight level of the backlight brightness of the display screen is detected to be within a preset backlight level range, acquiring first gray scale data collected by the optical sensor; the first gray scale data is used for representing corresponding gray scale data when external environment light and light leakage of the display screen act on the optical sensor together in the current state;
inputting the first gray scale data into a preset influence model, and acquiring compensation data corresponding to the first gray scale data by the preset influence model; the compensation data are used for representing corresponding gray scale data when light leakage of the display screen acts on the optical sensor in the current state, and the compensation data of different channels in the optical sensor are used for expanding the difference of the influence degree of the light leakage on the optical sensor;
compensating the first gray scale data by using the compensation data to obtain current gray scale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light.
Optionally, the obtaining, by the preset influence model, compensation data corresponding to the first gray scale data includes:
for each channel in the light sensor, performing the following operations:
extracting a grayscale component of the channel from the first grayscale data;
performing preset Fourier transform processing on the gray-scale components to obtain amplitudes of the gray-scale components on a fundamental frequency and a preset frequency multiplication of the fundamental frequency respectively; the fundamental frequency refers to a refresh frequency of the display;
acquiring the sum of the amplitude on the fundamental frequency and the amplitude on the preset frequency multiplication;
and inputting the sum value into a preset numerical model, and acquiring the compensation data of the channel by the preset numerical model.
Optionally, the preset fourier transform comprises at least one of: the grazier algorithm, the discrete fourier transform, and the fast fourier transform.
Optionally, the preset numerical model is represented by the following formula:
fi(x)＝aixn+bixn-1+cixn-2+......+zix0；
wherein x represents the sum of the fundamental frequency amplitude and the frequency multiplication amplitude, ai、bi、ci、……、ziAnd the coefficient corresponding to the i channel of the optical sensor is shown, and i is C/R/G/B.
Optionally, the method further comprises:
when detecting that the backlight level of the backlight brightness of the display screen is smaller than the minimum value of a preset backlight level range, switching to a first ambient light detection model matched with a PWM dimming mode to detect ambient light; alternatively, the first and second electrodes may be,
and when the backlight level of the backlight brightness of the display screen is detected to be larger than the maximum value of the preset backlight level range, switching to a second ambient light detection model matched with the direct current dimming mode to detect ambient light.
According to a second aspect of the embodiments of the present disclosure, there is provided an ambient light detection apparatus applied to an electronic device in which a light sensor is disposed below a display screen, the apparatus including:
the first data acquisition module is used for acquiring first gray scale data acquired by the optical sensor when detecting that the backlight level of the backlight brightness of the display screen is within a preset backlight level range; the first gray scale data is used for representing corresponding gray scale data when external environment light and light leakage of the display screen act on the optical sensor together in the current state;
the compensation data acquisition module is used for inputting the first gray scale data into a preset influence model and acquiring compensation data corresponding to the first gray scale data by the preset influence model; the compensation data are used for representing corresponding gray scale data when light leakage of the display screen acts on the optical sensor in the current state, and the compensation data of different channels in the optical sensor are used for expanding the difference of the influence degree of the light leakage on the optical sensor;
the current data acquisition module is used for compensating the first gray scale data by using the compensation data to acquire current gray scale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light.
Optionally, the compensation data obtaining module includes a component obtaining unit, an amplitude obtaining unit, a sum obtaining unit, and a data obtaining unit, and for each channel in the optical sensor, the component obtaining unit, the amplitude obtaining unit, the sum obtaining unit, and the data obtaining unit respectively perform the following operations:
the component acquiring unit is used for extracting a gray scale component of the channel from the first gray scale data;
the amplitude acquisition unit is used for carrying out preset Fourier change processing on the gray scale components to obtain amplitudes of the gray scale components on a fundamental frequency and a preset frequency multiplication of the fundamental frequency respectively; the fundamental frequency refers to a refresh frequency of the display;
the sum value acquiring unit is used for acquiring the sum value of the amplitude on the fundamental frequency and the amplitude on the preset frequency multiplication;
and the data acquisition unit is used for inputting the sum value into a preset numerical model and acquiring the compensation data of the channel by the preset numerical model.
According to a third aspect of the embodiments of the present disclosure, there is provided an electronic apparatus including:
a display screen;
a light sensor disposed below the display screen;
a processor;
a memory for storing a computer program executable by the processor;
the processor is configured to execute the computer program in the memory to implement the steps of the method of the first aspect.
According to a fourth aspect of embodiments of the present disclosure, there is provided a readable storage medium having stored thereon an executable computer program which, when executed, performs the steps of the method of the first aspect.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
as can be seen from the above embodiments, in the embodiments of the present disclosure, when the backlight level that detects the backlight brightness of the display screen is within the preset backlight level range, the first gray scale data acquired by the optical sensor is acquired; the first gray scale data is used for representing corresponding gray scale data when external environment light and light leakage of the display screen act on the optical sensor together in the current state; then, inputting the first gray scale data into a preset influence model, and acquiring compensation data corresponding to the first gray scale data by the preset influence model; the compensation data are used for representing corresponding gray scale data when light leakage of the display screen acts on the optical sensor in the current state, and the compensation data of different channels in the optical sensor are used for expanding the difference of the influence degree of the light leakage on the optical sensor; then, compensating the first gray scale data by using the compensation data to obtain current gray scale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light. In the embodiment, the compensation data of the first gray scale data can be acquired through a preset influence model, and the compensation data can enlarge the difference of influences of light leakage on each channel of the optical sensor; through compensating first gray scale data, can enlarge the difference that external environment light influences each passageway of light sensor to be favorable to promoting the accuracy that detects external environment light change and improve the accuracy of the illumination intensity that detects, and then make the backlight and the external environment phase-match of display screen, promote the user and use electronic equipment's experience.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a flow chart illustrating a method of ambient light detection according to an exemplary embodiment.
FIG. 2 is a schematic diagram illustrating the magnitude of the fundamental frequency and the frequency multiplication of the acquired gray scale data according to an exemplary embodiment.
FIG. 3 is a flow chart illustrating another method of ambient light detection according to an exemplary embodiment.
Fig. 4-6 are block diagrams illustrating an ambient light detection method apparatus according to an exemplary embodiment.
FIG. 7 is a block diagram illustrating an electronic device in accordance with an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure as recited in the claims below.
In practical application, when the backlight of the full-screen is dimmed, when the external ambient light is small enough, the influence of the light leak on the light sensor exceeds the influence of the external ambient light on the light sensor, so that the light sensor is insensitive to the external ambient light, the backlight of the display screen is kept constant, and even the backlight of the display screen cannot be switched to a PWM dimming mode in time, so that the dimming of the display screen has deviation, and the user experience is influenced.
In order to solve the above technical problem, an embodiment of the present disclosure provides an ambient light detection method, which may be applied to an electronic device with a full-screen, in which an optical sensor is disposed below a display screen, where the display screen may be an OLED display screen, and fig. 1 is an ambient light detection method according to an exemplary embodiment. Referring to fig. 1, an ambient light detection method includes steps 11 to 13, wherein:
in step 11, when it is detected that the backlight level of the backlight brightness of the display screen is within a preset backlight level range, first gray scale data collected by the optical sensor is obtained.
In practical application, the OLED display screen may be provided with two backlight adjusting modes:
the first mode is PWM dimming mode. The driving module in the OLED display screen can adjust the backlight brightness displayed by the OLED in a PWM dimming mode, namely, when the pulse signal is at a high level, the OLED pixels are controlled to be on, when the pulse signal is at a low level, the OLED display screen is controlled to be off, and the pixel brightness is controlled by controlling the duty ratio of the pulse high level, which is called as the PWM dimming mode.
Mode two, direct current dimming mode. Because each pixel in the OLED display screen realizes brightness adjustment according to the current flowing through the OLED luminous tube, when the OLED display screen needs higher brightness, the current flowing into the OLED luminous tube is increased; when the OLED display panel needs to have lower brightness, the current flowing into the OLED light-emitting tube is reduced, which is called DC dimming mode (i.e. DC dimming mode).
It should be noted that the OLED display screen may obtain a current illumination intensity (lux) reported by the optical sensor, and may find a current backlight level (e.g., 0 to 2047) according to the current illumination intensity through a preset correspondence table between the illumination intensity and the backlight level. In practical application, a backlight level threshold (e.g. 300) may be preset, and when the current backlight level is less than the backlight level threshold, the OLED display screen may adopt a PWM dimming mode; when the current backlight level exceeds the backlight level threshold, the OLED display screen may adopt a direct current dimming mode.
In other words, after the OLED display screen is manufactured, the backlight intensity of the display screen can be detected by using a detection device such as a spectrometer. In the detection process, in consideration of the characteristic that the display screen is in a black-out state between two adjacent refreshes in the PWM dimming mode, the screen-out time T1 of the display screen can be obtained. When the screen-off time T1 is equal to the sampling period T2 of the light sensor (the integration time of the integration circuit within the light sensor), the backlight level a of the display screen at this time can be determined, and this backlight level a is subsequently referred to as the first backlight level. In other words, when the screen-off time T1 is less than the sampling period T2, the light sensor cannot accurately acquire the gray-scale data of the external environment light.
In combination with the description in the background, "when the external ambient light is sufficiently small, the influence of the light leakage on the light sensor exceeds the influence of the external ambient light on the light sensor, so that the light sensor is not sensitive to the external ambient light, thereby keeping the backlight of the display screen constant (or approximately constant)"; or, when the refresh frequency is 4f, if f takes 90Hz, the refresh frequency is 360Hz, at this time, the sampling frequency of the optical sensor needs to exceed 720Hz, and the upper limit of the sampling frequency of the optical sensor is 680Hz, so that the gray-scale data collected by the optical sensor is smaller than the real gray-scale data, which reduces the gray-scale data difference of each channel of the optical sensor, and makes the electronic device unable to determine the change of the external ambient light. In this way, when the light detection device detects that the refresh frequency of the backlight of the display screen jumps from f to 4f (taking the PWM dimming mode as an example of the frequency), or from 4f to f, it may determine that the display screen is adjusted from the DC dimming mode to the PWM dimming mode, and at this moment, the corresponding backlight level is B, which is the starting level of the state where the backlight of the display screen is kept constant (or approximately constant). The backlight level B is subsequently referred to as a second backlight level.
Based on the principle of obtaining the first backlight level and the second backlight level, when the backlight level of the display screen is within a range of the backlight level formed by the first backlight level and the second backlight level, the backlight of the display screen is kept constant (or approximately constant), that is, from the perspective of a user, the backlight of the display screen is not changed, and the external ambient light is changed from moment to moment, so that the use of the user is affected. Therefore, in the embodiment of the present disclosure, a backlight level range is formed by using the first backlight level and the second backlight level, and the backlight level range can be used as a preset backlight level range, and the ambient light detection method provided by the embodiment of the present disclosure is implemented in the backlight level range.
Or, in this embodiment, by acquiring whether the backlight level of the display screen is within the preset backlight level range, the electronic device may convert the problem found by the user angle into a problem that the electronic device autonomously detects, and actively detect whether the backlight of the display screen is constant, so as to determine whether to execute the ambient light detection method provided by the embodiment of the present disclosure, which is beneficial to solving the technical problems existing in the related art.
In this embodiment, a processor of the electronic device may communicate with the OLED display screen to obtain a backlight level of the OLED display screen in a current state; alternatively, the processor directly calculates the backlight level of the OLED display screen in the current state, which is not limited herein.
In this embodiment, when the processor detects the backlight level of the backlight brightness of the display screen, the processor may compare the backlight level with a preset backlight level range, so as to determine whether the backlight level is within the preset backlight level range.
When the backlight level of the backlight brightness of the display screen is detected to be within a preset backlight level range, gray scale data (ADC count) collected by the optical sensor is obtained and is called as first gray scale data. It should be noted that, the process of acquiring the first gray scale data by the optical sensor may refer to the related art, and is not described herein again.
In an embodiment, when it is detected that the backlight level of the backlight brightness of the display screen is smaller than the minimum value of the preset backlight level range, the first ambient light detection model matched with the PWM dimming mode is switched to detect the ambient light, that is, the gray scale data of the external ambient light is detected when the display screen is a black screen.
In another embodiment, when the backlight level of the backlight brightness of the display screen is detected to be greater than the maximum value of the preset backlight level range, switching to a second ambient light detection model matched with the direct current dimming mode to detect ambient light, for example, obtaining an image gray value of a currently displayed image, and compensating a first gray-scale value acquired by a light sensor by using the image gray-scale value to obtain a current gray-scale value; the current gray scale value is used for representing the gray scale corresponding to the current external environment light detected by the light sensor; finally, acquiring the current illumination intensity of the external environment light according to the current gray-scale value; the illumination intensity is used as the basis for adjusting the backlight brightness of the OLED display screen. Of course, the skilled person may also select a suitable method for detecting the ambient light according to a specific scenario, which is not limited herein.
In step 12, the first gray scale data is input to a preset influence model, and the preset influence model obtains compensation data corresponding to the first gray scale data.
In this embodiment, a preset influence model is preset in the electronic device. The preset influence model has at least the following functions:
first, the frequency is superimposed. The preset influence model can process gray scale data, and obtain the amplitude of the gray scale data at the fundamental frequency and the amplitude of the gray scale data at the preset frequency multiplication. The preset frequency multiplication can be 2 frequency multiplication, 3 frequency multiplication and 4 frequency multiplication … … n frequency multiplication of the fundamental frequency. The fundamental frequency refers to the refresh frequency of the OLED display screen. See FIG. 2, FOLEDiAnd (nf) represents the amplitude F corresponding to the fundamental frequency F, the frequency multiplication 2F, the frequency multiplication 3F and the frequency multiplication … … nf under different channels.
In practical application, a preset frequency doubling value, for example, 3 frequency doubling, can be set according to a specific scene, and at this time, the amplitude of the fundamental frequency, the amplitude of 2 frequency doubling and the amplitude of 3 frequency doubling can be obtained. Then, the sum of the amplitudes of the fundamental frequency and all the frequency multipliers is calculated, and the sum is used as input data to participate in the subsequent calculation of the illumination intensity. In the embodiment of the present disclosure, the manner of superimposing the frequency multiplication amplitude on the fundamental frequency amplitude is referred to as superimposing frequency.
It should be noted that the first function of the preset influence model has the following characteristics: considering that when the backlight is reduced to the second backlight level in the background art, the influence degree of the light leakage of the OLED display screen backlight on the photosensor is far higher than the influence degree of the external environment light on the photosensor, and further, the influence degrees of the light leakage on each channel in the photosensor are close (that is, the amplitude of the fundamental frequency is close or the amplitude change of the fundamental frequency is close), so that each channel of the photosensor is not sensitive to the external environment light. In the first function, the difference of the sum of the corresponding amplitudes of different channels can be enlarged by superposing the preset frequency multiplication amplitude on the amplitude of the fundamental frequency, so that when the sum of the amplitudes is used for replacing the amplitude of the fundamental frequency to calculate the illumination intensity, the difference of the influence degree of the external environment light on each channel is enlarged, the light sensor can be continuously sensitive to the external environment light, and meanwhile, the OLED display screen can continuously reduce the backlight level.
Second, compensation data is obtained. And a preset numerical model is arranged in the preset influence model, and can represent the change relation between the compensation data and the sum value, namely the numerical model can output the compensation data corresponding to the sum value under the condition of inputting the sum value. It should be noted that the numerical model may be trained by using a preset number (e.g., 10000) of sums, so that the error of the numerical model meets the setting requirement, thereby achieving the effect of completing the training.
In this embodiment, the numerical model may be represented by the following formula:
fi(x)＝aixn+bixn-1+cixn-2+……+zix0；
wherein x represents the sum of the fundamental frequency amplitude and the frequency multiplication amplitude, ai、bi、ci、……、ziAnd the coefficient corresponding to the i channel of the optical sensor is shown, and i is C/R/G/B.
In an example, the power n may take the value 2, i.e., the numerical model may be converted to:
f(x)＝aix2+bix+ci；
wherein, the value of i is C/R/G/B, which respectively corresponds to the full channel/red channel/green channel/blue channel of the optical sensor.
Based on the first function and the second function, the step of obtaining the compensation data corresponding to the first gray scale data by the predetermined influence model, referring to fig. 3, includes:
in step 31, a grayscale component of the channel is extracted from the first grayscale data. Because the light sensor can separately store the gray scale data collected by different channels (C/R/G/B), the processor can extract the gray scale component of each channel according to the storage area or the storage identification.
In step 32, performing a preset fourier transform on the grayscale component to obtain amplitudes of the grayscale component on the fundamental frequency and a preset frequency multiplication of the fundamental frequency, respectively; the base frequency refers to the refresh frequency of the display. Since the grayscale component of each channel is data composed of a number of discrete values, the grayscale component is processed by using a preset fourier transform in this example, and the preset fourier transform may include at least one of the following: the grazier algorithm, the discrete fourier transform, and the fast fourier transform. In view of the limited processing power of the electronic device, a gratzel algorithm (Goertzel) may be used in this example to obtain the amplitude of the base frequency to a predetermined frequency multiplication. Namely:
FOLEDi(nf)＝Goertzeli(xi)；
i＝C/R/G/B；
in step 33, the sum of the amplitude at the fundamental frequency and the amplitude at the preset frequency multiplier is obtained,
in step 34, the sum is input into a preset numerical model, and the compensation data of the channel is obtained by the preset numerical model, that is:
fi(x)＝aix2+bix+ci。
in step 13, compensating the first gray scale data by using the compensation data to obtain current gray scale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light.
In this embodiment, the compensation data f is obtainedi(x) The compensation data can then be used to compensate the first gray scale data. Assume a first gray-scale data Registeri(x) (ii) a i ═ C/R/G/B, current gray-scale data Ambient of external Ambient lighti(x) (ii) a i ═ C/R/G/B, then:
Ambienti(x)＝Registeri(x)-fi(x)；i＝C/R/G/B。
in this embodiment, the processor may use current gray scale value data Ambienti(x) Converted to illumination intensity (lux) as shown in the following equation:
where, channel is a gray scale value (i.e., adc count) converted by each channel of the optical sensor, i.e., a register value of the sensor, and Knm (n is 1, 2, 3 … …) is a coefficient obtained by fitting. n represents the type of the light source, namely different light source spectrums have different illumination intensity fitting calculation coefficients, m represents the channel number of the light sensor, and the lux equation is obtained by adding elements between corresponding row vectors in the matrix.
To this end, in the embodiment of the present disclosure, when it is detected that the backlight level of the backlight brightness of the display screen is within a preset backlight level range, first gray scale data acquired by the optical sensor is acquired; the first gray scale data is used for representing corresponding gray scale data when external environment light and light leakage of the display screen act on the optical sensor together in the current state; inputting the first gray scale data into a preset influence model, and acquiring compensation data corresponding to the first gray scale data by the preset influence model; the compensation data are used for representing corresponding gray scale data when light leakage of the display screen acts on the optical sensor in the current state, and the compensation data of different channels in the optical sensor are used for expanding the difference of the influence degree of the light leakage on the optical sensor; compensating the first gray scale data by using the compensation data to obtain current gray scale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light. In the embodiment, the compensation data of the first gray scale data can be acquired through a preset influence model, and the compensation data can enlarge the difference of influences of light leakage on each channel of the optical sensor; through compensating first gray scale data, can enlarge the difference that external environment light influences each passageway of light sensor to be favorable to promoting the accuracy that detects external environment light change and improve the accuracy of the illumination intensity that detects, and then make the backlight and the external environment phase-match of display screen, promote the user and use electronic equipment's experience.
Fig. 4 is a diagram illustrating an ambient light detection apparatus applied to an electronic device in which a light sensor is disposed below a display screen according to an exemplary embodiment. Referring to fig. 4, an ambient light detecting device includes:
a first data obtaining module 41, configured to obtain first grayscale data collected by the optical sensor when detecting that the backlight level of the backlight brightness of the display screen is within a preset backlight level range; the first gray scale data is used for representing corresponding gray scale data when external environment light and light leakage of the display screen act on the optical sensor together in the current state;
a compensation data obtaining module 42, configured to input the first gray scale data into a preset influence model, and obtain compensation data corresponding to the first gray scale data by using the preset influence model; the compensation data are used for representing corresponding gray scale data when light leakage of the display screen acts on the optical sensor in the current state, and the compensation data of different channels in the optical sensor are used for expanding the difference of the influence degree of the light leakage on the optical sensor;
a current data obtaining module 43, configured to compensate the first grayscale data by using the compensation data, so as to obtain current grayscale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light.
In an embodiment, referring to fig. 5, the compensation data acquisition module 42 includes a component acquisition unit 51, an amplitude acquisition unit 52, a sum value acquisition unit 53 and a data acquisition unit 54, and for each channel in the optical sensor, the component acquisition unit 51, the amplitude acquisition unit 2, the sum value acquisition unit 53 and the data acquisition unit 54 respectively perform the following operations:
the component obtaining unit 51 is configured to extract a grayscale component of the channel from the first grayscale data;
the amplitude obtaining unit 52 is configured to perform preset fourier transform processing on the grayscale component to obtain amplitudes of the grayscale component on a fundamental frequency and a preset frequency multiplication of the fundamental frequency, respectively; the fundamental frequency refers to a refresh frequency of the display;
the sum obtaining unit 53 is configured to obtain a sum of the amplitude at the fundamental frequency and the amplitude at the preset frequency multiplication;
the data obtaining unit 54 is configured to input the sum to a preset numerical model, and obtain compensation data of the channel through the preset numerical model.
In an embodiment, referring to fig. 6, the apparatus further comprises:
the first switching module 61 is configured to switch to a first ambient light detection model matched with the PWM dimming mode to detect ambient light when detecting that the backlight level of the backlight brightness of the display screen is smaller than the minimum value of the preset backlight level range; alternatively, the first and second electrodes may be,
and a second switching module 62, configured to switch to a second ambient light detection model matched with the dc dimming mode to detect ambient light when detecting that the backlight level of the backlight brightness of the display screen is greater than the maximum value of the preset backlight level range.
It can be understood that the apparatus provided in the embodiments of the present disclosure corresponds to the method described above, and specific contents may refer to the contents of each embodiment of the method, which are not described herein again.
FIG. 7 is a block diagram illustrating an electronic device in accordance with an example embodiment. For example, the electronic device 700 may be a smartphone, a computer, a digital broadcast terminal, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
Referring to fig. 7, electronic device 700 may include one or more of the following components: a processing component 702, a memory 704, a power component 706, a multimedia component 708, an audio component 710, an input/output (I/O) interface 712, a sensor component 714, a communication component 716, and an image capture component 718.
The processing component 702 generally operates the entirety of the electronic device 700, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 702 may include one or more processors 720 to execute computer programs. Further, the processing component 702 may include one or more modules that facilitate interaction between the processing component 702 and other components. For example, the processing component 702 may include a multimedia module to facilitate interaction between the multimedia component 708 and the processing component 702.
The memory 704 is configured to store various types of data to support operations at the electronic device 700. Examples of such data include computer programs for any application or method operating on the electronic device 700, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 704 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
The power supply component 706 provides power to the various components of the electronic device 700. The power components 706 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the electronic device 700.
The multimedia component 708 includes a screen that provides an output interface between the electronic device 700 and the target object. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a target object. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation.
The audio component 710 is configured to output and/or input audio signals. For example, the audio component 710 includes a Microphone (MIC) configured to receive external audio signals when the electronic device 700 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal may further be stored in the memory 704 or transmitted via the communication component 716. In some embodiments, audio component 710 also includes a speaker for outputting audio signals.
The I/O interface 712 provides an interface between the processing component 702 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc.
The sensor assembly 714 includes one or more sensors for providing various aspects of status assessment for the electronic device 700. For example, the sensor component 714 may detect an open/closed state of the electronic device 700, the relative positioning of components, such as a display and keypad of the electronic device 700, the sensor component 714 may also detect a change in the position of the electronic device 700 or one of the components, the presence or absence of a target object in contact with the electronic device 700, orientation or acceleration/deceleration of the electronic device 700, and a change in the temperature of the electronic device 700. As another example, the sensor assembly 714 also includes a light sensor disposed below the display screen, where the light sensor core in the light sensor can execute instructions to implement the steps of the methods shown in fig. 1-2.
The communication component 716 is configured to facilitate wired or wireless communication between the electronic device 700 and other devices. The electronic device 700 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 716 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 716 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the electronic device 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic components.
In an exemplary embodiment, a non-transitory readable storage medium is also provided, such as the memory 704 including instructions, that includes an executable computer program that is executable by the processor. The readable storage medium may be, among others, ROM, Random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. An ambient light detection method applied to an electronic device in which a light sensor is disposed below a display screen, the method comprising:
when the backlight level of the backlight brightness of the display screen is detected to be within a preset backlight level range, acquiring first gray scale data collected by the optical sensor; the first gray scale data is used for representing corresponding gray scale data when external environment light and light leakage of the display screen act on the optical sensor together in the current state;
inputting the first gray scale data into a preset influence model, and acquiring compensation data corresponding to the first gray scale data by the preset influence model; the compensation data are used for representing corresponding gray scale data when light leakage of the display screen acts on the optical sensor in the current state, and the compensation data of different channels in the optical sensor are used for expanding the difference of the influence degree of the light leakage on the optical sensor;
compensating the first gray scale data by using the compensation data to obtain current gray scale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light.
2. The ambient light detection method according to claim 1, wherein the obtaining of the compensation data corresponding to the first gray scale data by the predetermined influence model comprises:
for each channel in the light sensor, performing the following operations:
extracting a grayscale component of the channel from the first grayscale data;
performing preset Fourier transform processing on the gray-scale components to obtain amplitudes of the gray-scale components on a fundamental frequency and a preset frequency multiplication of the fundamental frequency respectively; the fundamental frequency refers to a refresh frequency of the display;
acquiring the sum of the amplitude on the fundamental frequency and the amplitude on the preset frequency multiplication;
and inputting the sum value into a preset numerical model, and acquiring the compensation data of the channel by the preset numerical model.
3. The ambient light detection method according to claim 2, wherein the preset fourier transform comprises at least one of: the grazier algorithm, the discrete fourier transform, and the fast fourier transform.
4. An ambient light detection method according to claim 2, wherein the preset numerical model is expressed by the following formula:
fi(x)＝aixn+bixn-1+cixn-2+......+zix0；
wherein x represents the sum of the fundamental frequency amplitude and the frequency multiplication amplitude, ai、bi、ci、……、ziSystems representing optical sensor i-channel correspondencesAnd taking the number i as C/R/G/B.
5. The method of ambient light detection according to claim 1, further comprising:
when detecting that the backlight level of the backlight brightness of the display screen is smaller than the minimum value of a preset backlight level range, switching to a first ambient light detection model matched with a PWM dimming mode to detect ambient light; alternatively, the first and second electrodes may be,
and when the backlight level of the backlight brightness of the display screen is detected to be larger than the maximum value of the preset backlight level range, switching to a second ambient light detection model matched with the direct current dimming mode to detect ambient light.
6. An ambient light detection device, for use in an electronic device having a light sensor disposed below a display screen, the device comprising:
the first data acquisition module is used for acquiring first gray scale data acquired by the optical sensor when detecting that the backlight level of the backlight brightness of the display screen is within a preset backlight level range; the first gray scale data is used for representing corresponding gray scale data when external environment light and light leakage of the display screen act on the optical sensor together in the current state;
the compensation data acquisition module is used for inputting the first gray scale data into a preset influence model and acquiring compensation data corresponding to the first gray scale data by the preset influence model; the compensation data are used for representing corresponding gray scale data when light leakage of the display screen acts on the optical sensor in the current state, and the compensation data of different channels in the optical sensor are used for expanding the difference of the influence degree of the light leakage on the optical sensor;
the current data acquisition module is used for compensating the first gray scale data by using the compensation data to acquire current gray scale data; the current gray scale data is used for representing corresponding gray scale data when external environment light acts on the optical sensor in the current state; the current gray-scale data is used for acquiring the current illumination intensity of the external environment light.
7. The ambient light detection device according to claim 6, wherein the compensation data acquisition module includes a component acquisition unit, an amplitude acquisition unit, a sum value acquisition unit, and a data acquisition unit, and the component acquisition unit, the amplitude acquisition unit, the sum value acquisition unit, and the data acquisition unit respectively perform the following operations for each channel in the light sensor:
the component acquiring unit is used for extracting a gray scale component of the channel from the first gray scale data;
the amplitude acquisition unit is used for carrying out preset Fourier change processing on the gray scale components to obtain amplitudes of the gray scale components on a fundamental frequency and a preset frequency multiplication of the fundamental frequency respectively; the fundamental frequency refers to a refresh frequency of the display;
the sum value acquiring unit is used for acquiring the sum value of the amplitude on the fundamental frequency and the amplitude on the preset frequency multiplication;
and the data acquisition unit is used for inputting the sum value into a preset numerical model and acquiring the compensation data of the channel by the preset numerical model.
8. The ambient light detection device of claim 6, further comprising:
the first switching module is used for switching to a first ambient light detection model matched with the PWM dimming mode to detect ambient light when the backlight level of the backlight brightness of the display screen is detected to be smaller than the minimum value of a preset backlight level range; alternatively, the first and second electrodes may be,
and the second switching module is used for switching to a second ambient light detection model matched with the direct current dimming mode to detect ambient light when the backlight level of the backlight brightness of the display screen is detected to be greater than the maximum value of the preset backlight level range.
9. An electronic device, comprising:
a display screen;
a light sensor disposed below the display screen;
a processor;
a memory for storing a computer program executable by the processor;
the processor is configured to execute the computer program in the memory to implement the steps of the method of any of claims 1 to 5.
10. A readable storage medium having stored thereon an executable computer program, wherein the computer program when executed implements the steps of the method of any one of claims 1 to 5.
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