CN112146757A - Ambient light detection device - Google Patents
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Abstract
The present disclosure relates to an ambient light detection device. The device includes: the first circular polarizing film is positioned above the display screen and covers the display screen, the beam splitter prism is positioned below the display screen, and the second circular polarizing film is positioned below the display screen and is positioned on a transmission path of the beam splitter prism; the first multichannel color sensor is positioned on a reflection path of the beam splitter prism and used for receiving first target light reflected by the beam splitter prism and acquiring data of the first target light to obtain a first ambient light response value; the second multichannel color sensor is positioned below the second circular polarizer and used for acquiring data of the received second target light to obtain a second ambient light response value; the processor is used for determining the parameter of the ambient light according to the acquired first ambient light response value and the acquired second ambient light response value. According to the device provided by the disclosure, target light detection is performed through the two multi-channel sensors, and the determined ambient light parameters are high in accuracy, stability and speed.
Description
Technical Field
The present disclosure relates to the field of optical technology, and in particular, to an ambient light detection device.
Background
In the related art, parameters such as the color of the ambient light can be detected by a conventional color sensor, which is typically an RGB color sensor or an XYZ color sensor. With the development trend of consumer electronics products, the screen occupation ratio is larger and larger, and sensors and cameras begin to develop the technology under the screen. However, in the related art, the accuracy of the measured parameters such as the color of the ambient light is low, and the measurement requirement cannot be met.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides an ambient light detection device.
According to a first aspect of the embodiments of the present disclosure, there is provided an ambient light detection apparatus applied to a terminal, the terminal including a display screen, the apparatus including: a first circular polarizer, a first multichannel color sensor, a second circular polarizer, a second multichannel color sensor, a beam splitter prism and a processor,
the first circular polarizing plate is positioned above the display screen and covers the display screen, the beam splitter prism is positioned below the display screen, and the second circular polarizing plate is positioned below the display screen and on a transmission path of the beam splitter prism;
the first multichannel color sensor is located on a reflection path of the beam splitter prism, and is configured to receive first target light reflected by the beam splitter prism, and perform data acquisition on the first target light to obtain a first ambient light response value, where the first target light includes: the display screen sequentially passes through at least one of the first circular polarizing film, the display screen, ambient light reflected by the light splitting prism and screen light emitted by the display screen and reflected by the light splitting prism;
the second multichannel color sensor is located below the second circular polarizing film and used for collecting data of received second target light to obtain a second ambient light response value, and the second target light comprises at least one of ambient light which sequentially passes through the first circular polarizing film, the display screen, the light splitting prism transmission and the second circular polarizing film and screen light which is emitted by the display screen and sequentially passes through the light splitting prism transmission and the second circular polarizing film;
the processor is connected with the first multichannel color sensor and the second multichannel color sensor, and is configured to determine the parameter of the ambient light according to the acquired first ambient light response value and the acquired second ambient light response value.
For the above device, in one possible implementation, the first circular polarizer and the second circular polarizer have opposite rotation directions.
For the above apparatus, in one possible implementation, the processor is further configured to:
controlling the first multichannel color sensor and the second multichannel color sensor to respectively acquire a plurality of groups of first initial ambient light response values and a plurality of groups of second initial ambient light response values;
calibrating the first multichannel color sensor according to the multiple groups of first initial ambient light response values, the transmission spectrum of the display screen, the reflection spectrum of the light splitting prism and a predetermined first calibration function;
and calibrating the second multichannel color sensor according to the plurality of groups of second initial ambient light response values, the transmission spectrum of the first circular polaroid, the transmission spectrum of the display screen, the transmission spectrum of the light splitting prism, the transmission spectrum of the second circular polaroid and a predetermined second calibration function.
For the above apparatus, in one possible implementation, the first calibration function and/or the second calibration function comprises a calibration matrix that is a product of a tri-stimulus matrix and an inverse of a spectral effect matrix.
For the apparatus, in a possible implementation manner, determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value includes:
and determining the spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, the transmission spectrums of the first circular polarizing film, the second circular polarizing film and the display screen, and the reflection spectrum and the transmission spectrum of the light splitting prism.
For the above device, in a possible implementation manner, the second target light includes ambient light passing through the first circular polarizer, the display screen, the beam splitter prism transmission and the second circular polarizer in sequence, and screen light emitted by the display screen passing through the beam splitter prism transmission and the second circular polarizer in sequence,
wherein, according to the first ambient light response value, the second ambient light response value, and the transmission spectrums of the first circular polarizer, the second circular polarizer and the display screen, the reflection spectrum and the transmission spectrum of the beam splitter prism, determining the spectral information of the ambient light includes:
spectral information of the ambient light is calculated by equation 1,
wherein A is0For spectral information of the ambient light, ALS1 is spectral information of the first multi-channel color sensor determined from the first ambient light response value, ALS2 is spectral information of the second multi-channel color sensor determined from the second ambient light response value, TtL1Is the reflection spectrum, T, of the beam-splitting prismL2Is a combined transmission spectrum determined according to the transmission spectrum of the beam splitter prism and the transmission spectrum of the second circular polaroid, TA1Is a combined transmission spectrum determined from the transmission spectrum of the first circular polarizing plate, the transmission spectrum of the display screen and the reflection spectrum of the beam splitter prism, TA2Is a combined transmission spectrum determined from the transmission spectrum of the first circular polarizing plate, the transmission spectrum of the display screen, the transmission spectrum of the beam splitter prism, and the transmission spectrum of the second circular polarizing plate.
For the above device, in a possible implementation manner, the second target light includes screen light emitted by the display screen and transmitted through the beam splitter prism and the second circular polarizer in sequence,
wherein, according to the first ambient light response value, the second ambient light response value, and the transmission spectrums of the first circular polarizer, the second circular polarizer and the display screen, the reflection spectrum and the transmission spectrum of the beam splitter prism, determining the spectral information of the ambient light includes:
spectral information of the ambient light is calculated by equation 2,
wherein A is0For spectral information of the ambient light, ALS1 is spectral information of the first multi-channel color sensor determined from the first ambient light response value, ALS2 is spectral information of the second multi-channel color sensor determined from the second ambient light response value, TtL1Is the reflection spectrum, T, of the beam-splitting prismL2Is a combined transmission spectrum determined according to the transmission spectrum of the beam splitter prism and the transmission spectrum of the second circular polaroid, TA1Is a combined transmission spectrum determined from the transmission spectrum of the first circular polarizing plate, the transmission spectrum of the display screen, and the reflection spectrum of the beam splitter prism.
For the above apparatus, in one possible implementation, the parameter of the ambient light further includes a color temperature,
determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value, including:
determining spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, transmission spectrums of the first circular polarizing film, the second circular polarizing film and the display screen, and a reflection spectrum and a transmission spectrum of the light splitting prism;
and determining the color temperature of the ambient light according to the spectral information of the ambient light.
For the above apparatus, in one possible implementation, the color channels of the ambient light include an X color channel, a Y color channel, and a Z color channel, the parameters of the ambient light further include an illuminance,
determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value, including:
determining an illuminance of a Y color channel in the ambient light, and labeling the illuminance of the Y color channel as the illuminance of the ambient light.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: the target light detection is carried out through the two multi-channel sensors, so that the accuracy, the stability and the speed of the parameters of the ambient light determined by the device are high. In addition, the light splitting prism is introduced to form a common light path scheme, light received by the two multi-channel sensors is split by the same light beam, the problem that errors are large in certain scenes due to the fact that the light received by the two sensors is not completely the same is solved, and accuracy of ambient light detection is further improved.
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.
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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 schematic diagram illustrating a configuration of an ambient light detection device according to an exemplary embodiment.
Fig. 2 is a schematic diagram illustrating the operation of an ambient light detection device according to an exemplary embodiment.
Fig. 3 is a block diagram illustrating an apparatus 800 employing an ambient light detection apparatus according to an exemplary 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 apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Fig. 1 is a schematic diagram illustrating a configuration of an ambient light detection device according to an exemplary embodiment. As shown in fig. 1, the device can be used in a terminal with a display screen, such as a mobile phone and a computer. The device includes: a first circular polarizer 11, a first multi-channel color sensor 12, a second circular polarizer 13, a second multi-channel color sensor 14, a beam splitter prism 15 and a processor (not shown in the figure). In order to explain the positional relationship of the components, the components are separated by a large distance in the figure, and in fact, adjacent components in the first circular polarizing plate, the second circular polarizing plate, the display screen and the beam splitter prism are combined together.
The first circular polarizer 11 is positioned above the display screen 21 and covers the display screen 21, the beam splitter prism 15 is positioned below the display screen 21, and the second circular polarizer 13 is positioned below the display screen 21 and on the transmission path of the beam splitter prism 15;
the first multichannel color sensor 12 is located on the reflection path of the light splitting prism 15, and is configured to receive first target light reflected by the light splitting prism 15, and perform data acquisition on the first target light to obtain a first ambient light response value, where the first target light includes: the ambient light reflected by the first circular polarizer 11, the display panel 12, the beam splitter prism 15, and the screen light emitted from the display panel 21 and reflected by the beam splitter prism 15 in this order.
The second multichannel color sensor 14 is located below the second circular polarizer 13, and is configured to perform data acquisition on the received second target light, and obtain a second ambient light response value. The second target light includes at least one of ambient light transmitted through the first circular polarizing plate 11, the display screen, the beam splitter prism 15 and the second circular polarizing plate 13 in sequence, and screen light emitted from the display screen and transmitted through the beam splitter prism 15 and the second circular polarizing plate 13 in sequence.
The processor is connected to the first multichannel color sensor 12 and the second multichannel color sensor 14, and is configured to determine a parameter of the ambient light according to the acquired first ambient light response value and the acquired second ambient light response value.
In this embodiment, the display screen may be an OLED display screen or the like, which is not limited in this disclosure. A glass cover plate can be arranged above the first circular polaroid to protect a display screen of the terminal. The beam splitting prism can realize 50:50 beam splitting to further ensure the accuracy and stability of detection.
In this embodiment, the first multi-channel color sensor and the second multi-channel color sensor may be sensors having four RGBC channels, three RGB channels, or three XYZ channels, and the two may use different sensors, which is not limited by the present disclosure.
In this embodiment, since the target lights collected by the first and second multi-channel color sensors share the same optical path, it is ensured that the lights received by the first and second multi-channel color sensors are obtained by splitting the same light beam by the splitting prism, even though the light is split. The splitting prism can not realize 50:50 splitting (caused by the self precision, installation and the like), the accuracy of ambient light detection can be ensured by calibration, and the adverse effects of weak or large difference on detection of ambient light corresponding to the first multi-channel color sensor and the second multi-channel color sensor are eliminated.
In this embodiment, the second circular polarizer may be separately disposed under the display screen, or may be integrated into the second multi-channel color sensor, which is not limited by this disclosure. Alternatively, the beam splitter prism, the second circular polarizer, the first multi-channel color sensor, and the second multi-channel color sensor may be integrated together as a unified device, which is not limited by the present disclosure.
The ambient light detection device that this disclosed embodiment provided is applied to the terminal, and the terminal includes the display screen, and the device includes: the device comprises a first circular polarizing film, a first multichannel color sensor, a second circular polarizing film, a second multichannel color sensor, a beam splitter prism and a processor. The first circular polarizing film is positioned above the display screen and covers the display screen, the beam splitter prism is positioned below the display screen, and the second circular polarizing film is positioned below the display screen and on a transmission path of the beam splitter prism; the first multichannel color sensor is located on a reflection path of the beam splitter prism and used for receiving first target light reflected by the beam splitter prism, acquiring data of the first target light and obtaining a first ambient light response value, wherein the first target light comprises: at least one of the ambient light reflected by the first circular polarizer, the display screen and the beam splitter prism and the screen light emitted by the display screen and reflected by the beam splitter prism in sequence; the second multi-channel color sensor is positioned below the second circular polarizing film and used for collecting data of received second target light to obtain a second ambient light response value, and the second target light comprises at least one of ambient light which sequentially passes through the first circular polarizing film, the display screen and the beam splitter prism and ambient light which sequentially passes through the second circular polarizing film and screen light which is emitted by the display screen and sequentially passes through the beam splitter prism and the second circular polarizing film; the processor is connected with the first multichannel color sensor and the second multichannel color sensor and used for determining the parameter of the ambient light according to the acquired first ambient light response value and the acquired second ambient light response value. The target light detection is carried out through the two multi-channel sensors, so that the accuracy, the stability and the speed of the parameters of the ambient light determined by the device are high.
Fig. 2 is a schematic diagram illustrating the operation of an ambient light detection device according to an exemplary embodiment. In one possible implementation, as shown in fig. 2, the first circular polarizer 11 may include a first linear polarizer and a first quarter-wave plate, and the second circular polarizer 13 may include a second quarter-wave plate and a second linear polarizer.
The polarization direction of the first linear polarizer and the optical axis of the first quarter glass sheet form an angle of 45 degrees so as to ensure that external light is changed into linearly polarized light after passing through the first linear polarizer and then is changed into circularly polarized light after passing through the first quarter glass sheet;
the first quarter glass sheet and the second quarter glass sheet do not need to consider the problem of optical axis correspondence, as for circularly polarized light, the circularly polarized light can be changed into linearly polarized light after passing through one quarter glass sheet, and the optical axis only influences the polarization direction of the linearly polarized light;
the circularly polarized light is changed into linearly polarized light after passing through the second quarter glass, wherein the polarization direction of the second linearly polarized light is required to be ensured to be vertical to the polarization direction of the linearly polarized light, and the polarization direction of the linearly polarized light is determined by the optical axis of the second quarter glass, so that the polarization direction of the second linearly polarized light is required to be 45 degrees with the optical axis of the second quarter glass (the 45 degrees are opposite to the 45 degrees and are required to be ensured to be opposite, namely, one is +45 degrees and one is-45 degrees, namely, the rotation directions of the two circular polarized light plates are opposite, and the two circular polarized light plates are attached oppositely, namely, the first circular polarized light plate is arranged on the linear polarized light, and the second circular polarized light plate is arranged on.
Optionally, the polarization directions of the first linear polarizer and the second linear polarizer are the same, and the directions of the optical axis planes of the first quarter-wave plate and the second quarter-wave plate are the same.
In this implementation manner, the directions of the optical axis planes of the first quarter-wave plate and the second quarter-wave plate are the same, so that when linearly polarized light with the same polarization direction is incident to the first quarter-wave plate and the second quarter-wave plate, the handedness of two circularly polarized light emitted from the first quarter-wave plate and the second quarter-wave plate is the same, for example, both are right-handed.
In this implementation, as shown in fig. 2, when the ambient light a0 passes through the first linear polarizer, it becomes linearly polarized light, and the linearly polarized light passes through the first 1/4 wave plate (i.e., the first quarter wave plate) and becomes right-handed circularly polarized light (or left-handed circularly polarized light, which is described here by taking right-handed circularly polarized light as an example); the right-handed circularly polarized light becomes left-handed circularly polarized light in the opposite direction after being reflected on the display screen; the left-handed circularly polarized light becomes linearly polarized light perpendicular to the polarization direction of the first linear polarizer after passing through the first 1/4 wave plate, and cannot pass through the first linear polarizer. Therefore, the reflection effect of the display screen on the ambient light can be reduced, and the readability of the display screen under the ambient light is improved.
In this embodiment, as shown in fig. 2, the ambient light a0 becomes linearly polarized light after passing through the first linear polarizer, the linearly polarized light becomes right-handed circularly polarized light (or left-handed circularly polarized light, which is described here by taking right-handed circularly polarized light as an example) after passing through the first 1/4 wave plate, and the right-handed circularly polarized light passes through the display screen, and then enters the dichroic prism without changing its direction. The light splitting prism reflects the right-handed circularly polarized light to the first multichannel color sensor, and the ambient light reflected by the first circularly polarizing plate, the display screen and the light splitting prism is ambient light A1. And the screen light emitted by the display screen is transmitted by the display screen and reflected by the beam splitter prism to enter the first multi-channel color sensor, and the screen light transmitted by the display screen and reflected by the beam splitter prism to enter the first multi-channel color sensor is the screen light L1. The first target light includes at least one of ambient light a1 and screen light L1.
In this implementation manner, as shown in fig. 2, the screen light emitted by the display screen is transmitted through the display screen, the beam splitter prism is transmitted into the second 1/4 wave plate (i.e., the second quarter wave plate), the second linear polarizer reaches the second multichannel color sensor, and the screen light transmitted by the display screen and transmitted by the beam splitter prism is the screen light L2, and the screen light passes through the second 1/4 wave plate, and the second linear polarizer enters the second multichannel color sensor.
In this implementation, as shown in fig. 2, since the polarization directions of the first and second linear polarizers are the same, the directions of the optical axial planes of the first 1/4 wave plate and the second 1/4 wave plate are the same. The environment light A0 becomes linearly polarized light after passing through the first linear polarizer, the linearly polarized light becomes dextrorotatory circularly polarized light after passing through the first 1/4 wave plate, and the dextrorotatory circularly polarized light is transmitted through the display screen and the light splitting prism, and the direction is unchanged. The linearly polarized light is converted into linearly polarized light through the second 1/4 wave plate, but because the vibration direction of the linearly polarized light is orthogonal (i.e., perpendicular) to the polarization direction of the second linearly polarized light, the linearly polarized light is converted by the second linearly polarized light plate and cannot reach the second multichannel color sensor. However, due to the manufacturing process, the first circular polarizer, the beam splitter prism, the second circular polarizer, and the display screen material, a small portion of the ambient light (i.e., the ambient light a2 shown in fig. 2) may still reach the second multichannel color sensor. Therefore, the second target light includes at least one of screen light L2 and ambient light a 2.
In one possible implementation, the processor may determine whether the second multi-channel color sensor acquires the second ambient light response value with the display screen off (no screen light) before the device performs ambient light detection. If the second multi-channel color sensor is capable of collecting a second ambient light response value when the display screen is off, it may be determined that a small portion of ambient light A2 may reach the second multi-channel color sensor. If the second multi-channel color sensor is unable to acquire the second ambient light response value when the display screen is off, it may be determined that no ambient light may reach the second multi-channel color sensor. In this way, a determination of the parameter of the ambient light may be made depending on whether a small portion of the ambient light is able to reach the second multi-channel color sensor.
In one possible implementation, the processor may be further configured to:
controlling the first multi-channel color sensor 12 and the second multi-channel color sensor 14 to respectively acquire a plurality of sets of first initial ambient light response values and a plurality of sets of second initial ambient light response values;
calibrating the first multichannel color sensor 12 according to the multiple groups of first initial ambient light response values, the transmission spectrum of the display screen, the reflection spectrum of the beam splitter prism 15 and a predetermined first calibration function;
the second multichannel color sensor 14 is calibrated according to the plurality of sets of second initial ambient light response values, the transmission spectrum of the first circularly polarizing plate 11, the transmission spectrum of the display screen, the transmission spectrum of the beam splitter prism 15, the transmission spectrum of the second circularly polarizing plate 13, and a predetermined second calibration function.
In this implementation, calibration performed on the first multichannel color sensor may calibrate the first initial ambient light response value according to the transmission spectrum of the display screen, the reflection spectrum of the beam splitter prism, and the predetermined first calibration function, and determine the relatively accurate calibrated first initial ambient light response value, and then determine the calibration adjustment required to be performed on the first multichannel color sensor according to the difference between the first initial ambient light response value and the calibrated first initial ambient light response value, so that the first multichannel color sensor may obtain the relatively accurate first ambient light response value according to the received first target light in the subsequent use process. Calibration carried out on the second multichannel color sensor can calibrate the second initial environment light response value according to the transmission spectrum of the first circular polaroid, the transmission spectrum of the display screen, the transmission spectrum of the beam splitter prism, the transmission spectrum of the second circular polaroid and a predetermined second calibration function, determine the relatively accurate calibrated second initial environment light response value, and further determine calibration adjustment required to be carried out on the second multichannel color sensor according to the difference between the second initial environment light response value and the calibrated second initial environment light response value, so that the second multichannel color sensor can obtain the relatively accurate second environment light response value according to the received second target light in the subsequent use process.
In this implementation manner, the calibration of the first multi-channel color sensor and the second multi-channel color sensor may be performed according to a synchronous and sequential order, and a person skilled in the art may set the order of the calibration of the first multi-channel color sensor and the second multi-channel color sensor according to actual needs, which is not limited by the present disclosure.
In this implementation, the first and second calibration functions are determined from spectral responses that can be determined from the sets of initial ambient light response values (i.e., the first initial ambient light response value, the second initial ambient light response value) and the CIE XYZ color matching function, which is a fitting function. The CIE XYZ color matching functions may be CIE1931 standard colorimetric system color matching functions. For example, the first or second calibration function may be a calibration matrix, a calibration exponential function, a calibration quadratic function, a calibration cubic function, a calibration fourier function, a calibration gaussian function, or the like.
In this implementation, the first and second multi-channel color sensors may be RGB color sensors, RGBC color sensors, RGBCW color sensors, RGBW color sensors, XYZ color sensors, XYZW color sensors, or the like, to which the present disclosure is not limited. To meet the computational requirements of the parameters of the ambient light, the ambient light response values output by the first and second multi-channel color sensors may be calibrated to response values corresponding to the XYZ three channels.
In one possible implementation, as shown in equation 3 below, the first or second calibration function includes a calibration matrix that is the product of the tristimulus matrix and the inverse of the spectral effect matrix.
M＝T*R-1Equation 3
For example, assuming that the first multi-channel color sensor is an RGB three-channel sensor, sets of first initial ambient light response values (A'X1，A'Y1，A'Z1)，…，(A'Xn，A'Yn，A'Zn) The calibration matrix M is a 3 x 3 matrix (if the first multi-channel color sensor is an RGBC four-channel sensor, the calibration matrix M is a 4 x 3 matrix), and the first initial ambient light response value (a 'can be calculated according to the following equation 4'X1，A'Y1，A'Z1)，…，(A'Xn，A'Yn，A'Zn) Respectively corresponding calibrated first initial ambient light response values (A)X1，AY1，AZ1)，…，(AXn，AYn，AZn)。
In a possible implementation manner, in the process of performing ambient light detection, after data acquisition is performed on the first multichannel color sensor and the second multichannel color sensor each time, real-time calibration may be performed to obtain a first ambient light response value and a second ambient light response value. The time and mode of calibration can be set by those skilled in the art according to actual needs, and the present disclosure does not limit this.
In a possible implementation manner, determining a parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value may include:
and determining the spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, the transmission spectrums of the first circular polarizer 11, the second circular polarizer 13 and the display screen, and the reflection spectrum and the transmission spectrum of the beam splitter prism 15.
In a possible implementation manner, when the second target light includes the ambient light transmitted through the first circular polarizer 11, the display screen and the beam splitter prism 15 and the second circular polarizer 13 in sequence and the screen light emitted by the display screen transmitted through the beam splitter prism 15 and the second circular polarizer 13 in sequence,
ALS1＝A1+L1＝TA1A0+TL1*L0，ALS2＝A2+L2＝TA2A0+TL2*L0，L0is the spectral information of the screen light.
Determining the spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, the transmission spectrums of the first circular polarizer 11, the second circular polarizer 13, and the display screen, and the reflection spectrum and the transmission spectrum of the light splitting prism 15, may include:
spectral information of the ambient light is calculated by equation 1,
wherein A is0ALS1 is spectral information of the first multi-channel color sensor 12 determined from a first ambient light response value, ALS2 is spectral information of the second multi-channel color sensor 14 determined from a second ambient light response value, TL1Is the reflection spectrum, T, of the beam splitter prism 15L2Is a combined transmission spectrum determined from the transmission spectrum of the beam splitter prism 15 and the transmission spectrum of the second circularly polarizing plate 13, TA1Is a combined transmission spectrum determined from the transmission spectrum of the first circularly polarizing plate 11, the transmission spectrum of the display panel, and the reflection spectrum of the dichroic prism 15, TA2Is a combined transmission spectrum determined from the transmission spectrum of the first circular polarizing plate 11, the transmission spectrum of the display screen, the transmission spectrum of the dichroic prism 15, and the transmission spectrum of the second circular polarizing plate 13.
In one possible implementation, ALS1 ═ a when the second target light comprises screen light from the display screen that is transmitted through the beam splitter prism 15 in sequence and the second circular polarizer 131+L1＝TA1A0+TL1*L0，ALS2＝L2＝TL2*L0。
Determining the spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, the transmission spectrums of the first circular polarizer 11, the second circular polarizer 13, and the display screen, and the reflection spectrum and the transmission spectrum of the light splitting prism 15, may include:
spectral information of the ambient light is calculated by equation 2,
wherein A is0ALS1 is spectral information of the first multi-channel color sensor 12 determined from a first ambient light response value, ALS2 is spectral information of the second multi-channel color sensor 14 determined from a second ambient light response value, TL1Is the reflection spectrum, T, of the beam splitter prism 15L2Is a combined transmission spectrum determined from the transmission spectrum of the beam splitter prism 15 and the transmission spectrum of the second circularly polarizing plate 13, TA1Is a combined transmission spectrum determined from the transmission spectrum of the first circularly polarizing plate 11, the transmission spectrum of the display screen, and the reflection spectrum of the dichroic prism 15.
In this implementation, T may be predeterminedL1、TL2、TA1And TA2The person skilled in the art can determine T according to actual needsL1、TL2、TA1And TA2Are provided by way of example, and not limitation of the present disclosure.
In a possible implementation manner, the parameter of the ambient light may further include a color temperature, where determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value may include:
determining spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, the transmission spectrums of the first circular polarizing film 11, the second circular polarizing film 13 and the display screen, and the reflection spectrum and the transmission spectrum of the beam splitter prism 15;
and determining the color temperature of the ambient light according to the spectral information of the ambient light.
In this implementation, the color temperature of the ambient light can be calculated by equation 5,
CCT＝449n3+3525n2+6823.3n +5520.33 formula 5
Wherein CCT is the color temperature of the ambient light, x and y are color temperature coordinates, AXIs the coefficient of the X color channel, AYIs the coefficient of the Y color channel, AZIs the coefficient of the Z color channel. The color temperature is calculated by formula 5, and when the color temperature is 2856K to 6500K, the error of the calculated color temperature is less than 2K. Can be based on spectral information A of ambient light0Determination of AX、AY、AZ。
It should be understood that the above formula for calculating the color temperature is an example provided by the present disclosure, and a person skilled in the art may set the calculation manner of the color temperature according to actual needs, which is not limited by the present disclosure.
In one possible implementation, the color channels of the ambient light include an X color channel, a Y color channel, and a Z color channel, the parameters of the ambient light further include an illuminance,
determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value may include: the luminance of the Y color channel in the ambient light is determined and labeled as the luminance of the ambient light.
In this implementation, the illuminance of the X color channel, the Y color channel, and the Z color channel in the ambient light may be determined according to the spectral information of the ambient light. Furthermore, the illuminance of the X color channel or the Z color channel, or the illuminance of the ambient light may be determined as needed. The manner of determining the illuminance of the ambient light can be set by those skilled in the art according to practical needs, and the present disclosure does not limit this.
In a possible implementation, the parameter of the ambient light may further include other parameters that can be determined according to the spectral information of the ambient light to describe the characteristics of the ambient light, which is not limited by the present disclosure.
Fig. 3 is a block diagram illustrating an apparatus 800 employing an ambient light detection apparatus according to an exemplary embodiment. For example, the apparatus 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.
Referring to fig. 3, the apparatus 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.
The processing component 802 generally controls overall operation of the device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.
The memory 804 is configured to store various types of data to support operations at the apparatus 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 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 multimedia component 808 includes a screen that provides an output interface between the device 800 and a user. 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 user. 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. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.
The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the apparatus 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.
The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.
The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the device 800. For example, the sensor assembly 814 may detect the open/closed status of the device 800, the relative positioning of components, such as a display and keypad of the device 800, the sensor assembly 814 may also detect a change in the position of the device 800 or a component of the device 800, the presence or absence of user contact with the device 800, the orientation or acceleration/deceleration of the device 800, and a change in the temperature of the device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.
The communication component 816 is configured to facilitate communications between the apparatus 800 and other devices in a wired or wireless manner. The device 800 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 816 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 816 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 apparatus 800 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 for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the device 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an 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 application 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 (9)
1. An ambient light detection device, characterized in that is applied to the terminal, the terminal includes the display screen, the device includes: a first circular polarizer, a first multichannel color sensor, a second circular polarizer, a second multichannel color sensor, a beam splitter prism and a processor,
the first circular polarizing plate is positioned above the display screen and covers the display screen, the beam splitter prism is positioned below the display screen, and the second circular polarizing plate is positioned below the display screen and on a transmission path of the beam splitter prism;
the first multichannel color sensor is located on a reflection path of the beam splitter prism, and is configured to receive first target light reflected by the beam splitter prism, and perform data acquisition on the first target light to obtain a first ambient light response value, where the first target light includes: the display screen sequentially passes through at least one of the first circular polarizing film, the display screen, ambient light reflected by the light splitting prism and screen light emitted by the display screen and reflected by the light splitting prism;
the second multichannel color sensor is located below the second circular polarizing film and used for collecting data of received second target light to obtain a second ambient light response value, and the second target light comprises at least one of ambient light which sequentially passes through the first circular polarizing film, the display screen and the beam splitter prism and is transmitted by the second circular polarizing film and screen light which is emitted by the display screen and sequentially passes through the beam splitter prism and the second circular polarizing film;
the processor is connected with the first multichannel color sensor and the second multichannel color sensor, and is configured to determine the parameter of the ambient light according to the acquired first ambient light response value and the acquired second ambient light response value.
2. A device as recited in claim 1, wherein the first circular polarizer and the second circular polarizer are oppositely oriented.
3. The apparatus of claim 1, wherein the processor is further configured to:
controlling the first multichannel color sensor and the second multichannel color sensor to respectively acquire a plurality of groups of first initial ambient light response values and a plurality of groups of second initial ambient light response values;
calibrating the first multichannel color sensor according to the multiple groups of first initial ambient light response values, the transmission spectrum of the display screen, the reflection spectrum of the light splitting prism and a predetermined first calibration function;
and calibrating the second multichannel color sensor according to the plurality of groups of second initial ambient light response values, the transmission spectrum of the first circular polaroid, the transmission spectrum of the display screen, the transmission spectrum of the light splitting prism, the transmission spectrum of the second circular polaroid and a predetermined second calibration function.
4. The apparatus of claim 3, wherein the first calibration function and/or the second calibration function comprises a calibration matrix that is a product of a tri-stimulus matrix and an inverse of a spectral effect matrix.
5. The apparatus according to claim 1, wherein determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value includes:
and determining the spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, the transmission spectrums of the first circular polarizing film, the second circular polarizing film and the display screen, and the reflection spectrum and the transmission spectrum of the light splitting prism.
6. The apparatus according to claim 5, wherein the second target light includes ambient light passing through the first circular polarizer, the display panel, the beam splitter prism transmission, and the second circular polarizer in this order, and screen light emitted from the display panel passing through the beam splitter prism transmission, the second circular polarizer in this order,
wherein, according to the first ambient light response value, the second ambient light response value, and the transmission spectrums of the first circular polarizer, the second circular polarizer and the display screen, the reflection spectrum and the transmission spectrum of the beam splitter prism, determining the spectral information of the ambient light includes:
spectral information of the ambient light is calculated by equation 1,
wherein A is0For spectral information of the ambient light, ALS1 is spectral information of the first multi-channel color sensor determined from the first ambient light response value, ALS2 is spectral information of the second multi-channel color sensor determined from the second ambient light response valueT ofL1Is the reflection spectrum, T, of the beam-splitting prismL2Is a combined transmission spectrum determined according to the transmission spectrum of the beam splitter prism and the transmission spectrum of the second circular polaroid, TA1Is a combined transmission spectrum determined from the transmission spectrum of the first circular polarizing plate, the transmission spectrum of the display screen and the reflection spectrum of the beam splitter prism, TA2Is a combined transmission spectrum determined from the transmission spectrum of the first circular polarizing plate, the transmission spectrum of the display screen, the transmission spectrum of the beam splitter prism, and the transmission spectrum of the second circular polarizing plate.
7. The apparatus according to claim 5, wherein the second target light comprises screen light emitted from the display screen and transmitted through the beam splitter prism in sequence, and the second circular polarizer,
wherein, according to the first ambient light response value, the second ambient light response value, and the transmission spectrums of the first circular polarizer, the second circular polarizer and the display screen, the reflection spectrum and the transmission spectrum of the beam splitter prism, determining the spectral information of the ambient light includes:
spectral information of the ambient light is calculated by equation 2,
wherein A is0For spectral information of the ambient light, ALS1 is spectral information of the first multi-channel color sensor determined from the first ambient light response value, ALS2 is spectral information of the second multi-channel color sensor determined from the second ambient light response value, TtL1Is the reflection spectrum, T, of the beam-splitting prismL2Is a combined transmission spectrum determined according to the transmission spectrum of the beam splitter prism and the transmission spectrum of the second circular polaroid, TA1Is a combined transmission spectrum determined from the transmission spectrum of the first circular polarizing plate, the transmission spectrum of the display screen, and the reflection spectrum of the beam splitter prism.
8. The apparatus of claim 1, wherein the parameter of the ambient light further comprises a color temperature,
determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value, including:
determining spectral information of the ambient light according to the first ambient light response value, the second ambient light response value, transmission spectrums of the first circular polarizing film, the second circular polarizing film and the display screen, and a reflection spectrum and a transmission spectrum of the light splitting prism;
and determining the color temperature of the ambient light according to the spectral information of the ambient light.
9. The apparatus of claim 1, wherein the color channels of ambient light comprise an X color channel, a Y color channel, and a Z color channel, the parameter of the ambient light further comprising an illuminance,
determining the parameter of the ambient light according to the obtained first ambient light response value and the obtained second ambient light response value, including:
determining an illuminance of a Y color channel in the ambient light, and labeling the illuminance of the Y color channel as the illuminance of the ambient light.
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