CN110926606A - Ambient light detection circuit and terminal device - Google Patents
Ambient light detection circuit and terminal device Download PDFInfo
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- CN110926606A CN110926606A CN201911205606.8A CN201911205606A CN110926606A CN 110926606 A CN110926606 A CN 110926606A CN 201911205606 A CN201911205606 A CN 201911205606A CN 110926606 A CN110926606 A CN 110926606A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4204—Photometry, e.g. photographic exposure meter using electric radiation detectors with determination of ambient light
Abstract
The disclosure relates to an ambient light detection circuit and terminal equipment, and belongs to the technical field of ambient light detection. The ambient light detection circuit cooperates with a foldable screen that includes a first portion and a second portion that are foldable relative to each other. The ambient light detection circuit includes: the device comprises a detection module, at least two ambient light sensors and a control module. The detection module is used for detecting the relative position of the first part and the second part. At least two ambient light sensors are respectively arranged corresponding to the first part and the second part and used for detecting the intensity of ambient light. The control module is connected with the detection module and the at least two ambient light sensors and used for enabling the ambient light sensors corresponding to the first portion and/or the second portion according to the relative positions.
Description
Technical Field
The present disclosure relates to the field of optical sensing technologies, and in particular, to an ambient light detection circuit and a terminal device.
Background
With the development of hardware technology, the folding screen becomes a hot trend of the terminal device. The folding screen can be folded along a set axis, so that the terminal equipment with the folding screen has multiple working states.
The ambient light detection circuit is widely applied to the terminal equipment and used for detecting the light intensity of the environment where the terminal equipment is located and further controlling the brightness of the display screen according to the detection result. However, the related art does not provide an ambient light detection circuit capable of cooperating with a folding screen.
Disclosure of Invention
The present disclosure provides an ambient light detection circuit and a terminal device to solve the drawbacks of the related art.
An ambient light detection circuit according to a first aspect of the present disclosure, the circuit cooperating with a foldable screen comprising a first portion and a second portion that are relatively foldable; the circuit comprises:
a detection module for detecting the relative position of the first part and the second part;
at least two ambient light sensors respectively corresponding to the first part and the second part and used for detecting the intensity of ambient light; and
and the control module is connected with the detection module and the at least two ambient light sensors and used for enabling the ambient light sensors corresponding to the first part and/or the second part according to the relative positions.
In one embodiment, the relative position includes the first and second portions being upwardly and co-planarly disposed;
the control module enables an ambient light sensor corresponding to the first portion and the second portion in response to the first portion and the second portion being disposed upwardly and coplanar.
In one embodiment, the relative position includes the first portion being located above the second portion;
the control module enables the ambient light sensor corresponding to the first portion and disables the ambient light sensor corresponding to the second portion in response to the first portion being located over the second portion.
In one embodiment, the relative position includes the second portion being located above the first portion;
the control module enables the ambient light sensor corresponding to the second portion and disables the ambient light sensor corresponding to the first portion in response to the second portion being located above the first portion.
In one embodiment, the ambient light sensor comprises:
a light scattering member that converts incident light into scattered light; and
the signal conversion module is used for receiving the scattered light and obtaining a first digital signal and a second digital signal according to the scattered light;
the first digital signal is positively correlated with the light intensity of the incident light, and the second digital signal is positively correlated with the light intensity of the infrared light in the incident light.
In one embodiment, the signal conversion module comprises:
a first optical channel for receiving the scattered light and converting the scattered light into the first digital signal; and
and the second optical channel is used for receiving the infrared light in the scattered light and converting the infrared light into the first digital signal.
In one embodiment, the first optical channel comprises:
a first photoelectric conversion element for converting the scattered light into a first initial electrical signal;
a first signal amplification circuit that converts the first initial electrical signal into a first amplified electrical signal; and
a first analog-to-digital conversion circuit that converts the first amplified electrical signal to the first digital signal.
In one embodiment, the second optical channel comprises:
the second photoelectric conversion part is used for converting the infrared light in the scattered light into a second initial electric signal;
a second signal amplification circuit that converts the second initial electrical signal into a second amplified electrical signal; and
a second analog-to-digital conversion circuit that converts the second amplified electrical signal to the second digital signal.
In one embodiment, the detection module comprises: an angle sensor and/or an acceleration sensor.
According to a second aspect of the present disclosure, there is provided a terminal device comprising: a folding screen, and the ambient light detection circuit provided in the first aspect;
the folding screen comprises a first part and a second part which can be folded oppositely;
at least two ambient light sensors in the ambient light detection circuit are provided corresponding to the first portion and the second portion, respectively.
In one embodiment, a light hole is arranged on the folding screen, and the ambient light sensor is arranged corresponding to the light hole; alternatively, the first and second electrodes may be,
a gap is arranged on the folding screen, and the ambient light sensor is arranged corresponding to the gap; alternatively, the first and second electrodes may be,
the folding screen is provided with a light transmission area, and the ambient light sensor corresponds to the light transmission area and is attached to the back of the folding screen.
The ambient light detection circuit and the terminal device provided by the disclosure have at least the following beneficial effects:
confirm the use form of folding screen through detecting the module, use the different ambient light sensor of form control according to folding screen through the control module and enable. Therefore, the enabled ambient light sensor is matched with the use form of the current folding screen, and the user experience is optimized.
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 schematic diagram illustrating the construction of a folding screen according to one exemplary embodiment;
FIGS. 2-4 are schematic views illustrating use of a folding screen according to various exemplary embodiments;
FIG. 5 is a schematic diagram of an ambient light detection circuit provided in accordance with an exemplary embodiment;
FIG. 6 is a schematic diagram of an ambient light detection circuit provided in accordance with another exemplary embodiment;
FIG. 7 is a schematic diagram illustrating the use of an ambient light sensor in accordance with an exemplary embodiment;
FIG. 8 is a block diagram illustrating a signal conversion module in an ambient light sensor, according to an exemplary embodiment;
FIG. 9 is a circuit schematic of a first optical channel shown in accordance with an exemplary embodiment;
FIG. 10 is a schematic diagram illustrating an analog-to-digital conversion circuit in a first optical channel in accordance with an exemplary embodiment;
fig. 11 to 13 are schematic structural diagrams of terminal devices provided according to different exemplary embodiments.
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 embodiments described in the following exemplary embodiments do not represent all embodiments 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.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the terms "a" or "an" and the like in the description and in the claims of this disclosure do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprises" or "comprising" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As used in this disclosure and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The embodiment of the disclosure provides an ambient light detection circuit and a terminal device which can be matched with a folding screen to make up for the blank in the related art. Before describing the structure of the ambient light sensing circuit, the features of the folded screen that cooperates with the ambient light sensing circuit are introduced.
Fig. 1 is a perspective view of a folding screen shown according to an exemplary embodiment, and fig. 2 to 4 are use configurations of the folding screen shown according to different exemplary embodiments. As shown in fig. 1, the folding screen 100 includes a first portion 110 and a second portion 120 that are foldable relative to each other. The foldable screen 100 is an outer foldable screen, that is, the display surface of the screen is always folded toward the outside. In this way, the user can view the display content of the screen regardless of how the user folds. Based on the above, the folding screen 100 has the following three use forms:
as shown in fig. 2, the first portion 110 and the second portion 120 are unfolded upward and are coplanar, and the foldable screen 100 is in an unfolded state. In this case, the first step 110 and the second step 120 are both main display units. When the foldable screen 100 is in use, the display surfaces of the first and second portions 110, 120 are both facing the user.
As shown in fig. 3, the first portion 110 and the second portion 120 are folded such that the first portion 110 is located above the second portion 120. In this case, the first portion 110 is a main display portion. Taking the foldable screen 100 as an example, the user holds the second portion 120 and views the display content of the first portion 110.
As shown in fig. 4, the second portion 110 and the second portion 120 are folded such that the second portion 120 is located above the first portion 110. In this case, the second portion 120 is a main display portion. Taking the foldable screen 100 as an example, the user holds the first portion 110 and views the display content of the second portion 120.
Fig. 5 and 6 are schematic diagrams of ambient light detection circuits provided according to different exemplary embodiments. The ambient light detection circuit provided by the embodiment of the disclosure is used in cooperation with the folding screen shown in fig. 1 to 4. As shown in fig. 5, the ambient light detection circuit includes: a detection module 200, at least two ambient light sensors 300, and a control module 400.
The detecting module 200 is used for detecting the phase positions of the first portion 110 and the second portion 120 in the foldable screen 100. The relative positions of the first portion 110 and the second portion 120 include an upward coplanar arrangement as shown in FIG. 1, with the first portion 110 being positioned above the second portion 120 as shown in FIG. 2, and the second portion 120 being positioned above the first portion 110 as shown in FIG. 3.
As an example, the detection module 200 includes: an angle sensor (e.g., a gyroscope sensor) and/or an acceleration sensor (e.g., a gravity sensor). The detection module 200 is used for determining the phase positions of the first portion 110 and the second portion 120 by detecting the spatial state parameters (e.g., spatial rotation angle, acceleration, etc.) of the first portion 110 and the second portion 120.
Alternatively, as shown in fig. 6, the at least two detection modules 200 include a first detection module 210 disposed corresponding to the first portion 110 of the foldable screen 100, and a second detection module 220 disposed corresponding to the second portion 120 of the foldable screen 100. In this way, the first detection module 210 is configured to obtain the spatial state parameter of the first portion 110 to determine the spatial state of the first portion 110; the second detecting module 220 is used for obtaining the spatial state parameter of the second portion 120 to determine the spatial state of the second portion 120.
For example, the orientation parameters of the detecting module 200 include values of three coordinate axes, i.e., x-axis, y-axis and z-axis. Wherein, x-axis and y-axis set up and mutually perpendicular along the horizontal direction, and the z-axis points to ground along vertical direction.
When the first detecting module 210 detects that the z-axis parameter in the orientation parameter of the first portion 110 is negative, and the second detecting module 220 detects that the z-axis parameter in the orientation parameter of the second portion 120 is negative, it indicates that the first portion 110 and the second portion 120 are disposed upward and coplanar (as shown in fig. 2).
When the first detecting module 210 detects that the z-axis parameter in the orientation parameters of the first portion 110 is positive, and the second detecting module 220 detects that the z-axis parameter in the orientation parameters of the second portion 120 is negative, it indicates that the first portion 110 is located on the second portion 120 (as shown in fig. 3).
When the first detecting module 210 detects that the z-axis parameter in the orientation parameters of the first portion 110 is negative and the second detecting module 220 detects that the z-axis parameter in the orientation parameters of the second portion 120 is positive, it indicates that the second portion 120 is located on the first portion 110 (as shown in fig. 4).
The ambient light sensor 300 is used to fold the light intensity of the environment around the screen 100. At least two ambient light sensors 300 are disposed corresponding to the first and second portions 110 and 120, respectively. In this way, the ambient light sensor 300 disposed corresponding to the first portion 110 is used to detect the intensity of light of the environment surrounding the first portion 110. An ambient light sensor 300 is disposed in correspondence with the second portion 120 for detecting the intensity of light in the environment surrounding the second portion 120.
The control module 400 is connected to the detection module 200 and the ambient light sensor 300, and is configured to enable the ambient light sensor 300 corresponding to the first portion 110 and/or the second portion 120 according to the relative position of the first portion 110 and the second portion 120 detected by the detection module 200.
Specifically, the control module 400 enables the ambient light sensors 300 corresponding to the first and second portions 110 and 120 in response to the detection module 200 detecting that the first and second portions 110 and 120 are disposed upward and coplanar (as shown in fig. 2). In this way, the ambient light sensor 300 is able to detect changes in the light intensity of the environment surrounding the first and second portions 110, 120.
The control module 400 enables the ambient light sensor 300 corresponding to the first portion 110 to disable the ambient light sensor 300 corresponding to the second portion 120 in response to the detection module 200 detecting that the first portion 110 is located on the second portion 120 (as shown in fig. 3). In this case, the first portion 110 is a main display portion. In this way, the display effect of the first portion 110 is prevented from being affected by the change of the intensity of the ambient light around the second portion 120.
The control module 400 enables the ambient light sensor 300 corresponding to the second portion 120 to disable the ambient light sensor 300 corresponding to the first portion 110 in response to the detection module 200 detecting that the second portion 120 is located on the first portion 110 (as shown in fig. 4). In this case, the second portion 120 is a main display portion. In this way, the display effect of the second portion 110 is prevented from being affected by the change of the intensity of the ambient light around the first portion 110.
By using the ambient light detection circuit provided by the embodiment of the present disclosure, the relative positions of the first portion 110 and the second portion 120 in the foldable screen 100 are determined by the detection module 200, and the control module 400 enables the ambient light sensor 300 according to the detection result of the detection module 200. In this way, the enabled ambient light sensor 300 matches the current usage pattern of the foldable screen 100, so that the ambient light sensor 300 can accurately reflect the light intensity change of the surrounding environment of the main display part of the foldable screen, thereby optimizing the user experience.
FIG. 7 is a schematic diagram of the use of an ambient light sensor provided in accordance with an exemplary embodiment.
In the related art, in order to ensure that the display screen has a large display area, the size of the light-transmitting structure (e.g., light-transmitting hole, light-transmitting gap) on the display screen, which is matched with the ambient light sensor, is small. In this way, the ambient light sensor can receive incident light as a fine light beam. In such a case, a slight deviation of the incident angle of the incident light may cause a great change in the light intensity of the light signal received by the ambient light sensor, and further affect the detection result of the ambient light sensor.
In the embodiment of the present disclosure, as shown in fig. 7, the ambient light sensor 300 includes a light scattering member 310 and a signal conversion module 320.
The light scattering member 310 converts the scattered light L1 into scattered light L2. The signal conversion module 320 receives the scattered light L2 and obtains a first digital signal and a second digital signal according to the scattered light L2. The first digital signal D1 is positively correlated with the light intensity of the incident light L1, and the second digital signal D2 is positively correlated with the light intensity of the infrared light in the incident light L1.
In one example, the light dispersion member 310 is a light dispersion coating, a light dispersion sheet, or a light dispersion film. The scattered light L2 passing through the light scattering member 310 is distributed more uniformly than the incident light L1. In this case, no matter the incident light L1 is incident at any angle, it is ensured that the signal conversion module 320 actually senses the uniform and soft scattered light L2. In this way, the great change of the light intensity of the light signal received by the signal conversion module 320 due to the angle change of the incident light L1 is avoided.
Also, typically, the ambient light sensor 300 is disposed below the glass cover of the display screen. The refractive index of the diffusion member 310 is greater than that of the glass cover plate. In this way, as shown in fig. 7, in the case where the angle of refracted light (γ) is the same, the angle (θ) of incident light L1 when the scattering member 310 is used1) Greater than when the diffuser 310 is not usedAngle (theta) of incident light L12). Accordingly, the range FOV of the signal conversion module 320 capable of receiving light is increased by the light diffuser 310, and the detection accuracy of the ambient light sensor 300 on the intensity of ambient light is further optimized.
Fig. 8 is a block diagram illustrating a structure of the signal conversion module 320 according to an exemplary embodiment. In one example, as shown in fig. 8, the signal conversion module 320 includes: a first light channel 321 and a second light channel 322. The first optical channel 321 is configured to receive the scattered light L2 and convert the scattered light into a first digital signal D1. The second optical channel 322 is used for receiving the infrared light in the scattered light L2 and converting the infrared light into a second digital signal D2.
Fig. 9 is a circuit schematic diagram of a first optical channel according to an exemplary embodiment, and fig. 10 is a schematic diagram of an analog-to-digital conversion circuit in the first optical channel according to an exemplary embodiment.
As shown in fig. 9, the first light channel 321 includes: a first photoelectric conversion element 3211, a first signal amplification circuit 3212, and a first analog-to-digital conversion circuit 3213.
The first photoelectric conversion element 3211 converts the scattered light L2 into a first initial electrical signal a 1. Alternatively, the photodetector 321 is a single photodiode, or an array of photodiodes.
The first signal amplifying circuit 3212 is connected to the first photoelectric conversion element 3211, receives the first initial electrical signal a1, and converts the first initial electrical signal a1 into a first amplified electrical signal a 2.
Alternatively, as shown in fig. 9, the first signal amplifying circuit 3212 includes a primary amplifying circuit 3212a and a secondary amplifying circuit 3212 b. The primary amplifying circuit 3212a converts the first initial electrical signal a1 into an intermediate electrical signal A3. This process removes the bias voltage caused by the dark current and the parasitic resistance generated by the first photoelectric conversion element 3211. The two-stage amplifying circuit 3212b amplifies the intermediate electrical signal A3 to obtain a first amplified electrical signal a 2.
The first analog-to-digital conversion circuit 3213 is connected to the first signal amplification circuit 3212, and converts the first amplified electrical signal a2 into a first digital signal D1. Alternatively, the first analog-to-digital conversion circuit 3213 employs a circuit as shown in fig. 10.
Also, the first analog-to-digital conversion circuit 3213 includes a sample-and-hold circuit 3213a and an analog-to-digital converter 3213 b. The sample-and-hold circuit 3213a is connected to the first signal amplifying circuit 3212, and converts the amplified electrical signal a2 into an electrical signal a4 to be sampled. The analog-to-digital converter 3213b is connected to the sample-and-hold circuit 3213a, and converts the electrical signal a4 to be sampled into a first digital signal D1. The analog-to-digital converter 3213b needs a certain conversion time to perform analog-to-digital conversion on the electrical signal a4 to be sampled. During the conversion time, the electrical signal a4 to be sampled is kept substantially unchanged by the sample-and-hold circuit 3213a to ensure the conversion accuracy.
The second light channel 322 includes: a second photoelectric conversion element 3221, a second signal amplification circuit 3222, and a second analog-to-digital conversion circuit 3223.
Here, the second photoelectric conversion element 3221 converts the infrared light in the scattered light L2 into a second initial electrical signal. The second signal amplifying circuit 3222 is connected to the second photoelectric conversion element 3221, and converts the second initial electrical signal into a second amplified electrical signal. The second analog-to-digital conversion circuit 3223 is connected to the second signal amplification circuit 3222, and converts the second amplified electrical signal into a second digital signal D2.
The second light channel 322 differs from the first light channel 321 in that: the photoelectric converter of the second optical channel 322 comprises an infrared filter layer, which allows only infrared light in the scattered light L2 to pass through. In this way, the second digital signal D2 positively correlated with the light intensity of the infrared light in the scattered light L2 is obtained through the second light channel 322. Other components of the second optical channel 322 are the same as those of the first optical channel 321, and are not described again.
The control module 400 is connected to the ambient light sensor 300 and receives the first digital signal D1 and the second digital signal D2 outputted from the ambient light sensor 300. Further, the control module 400 obtains the intensity of the visible light in the incident light L1 according to the first digital signal D1 and the second digital signal D2 by a predetermined algorithm.
Wherein, the light intensity of the visible light in the incident light L1 is characterized by the following formula:
Lux＝(Channel0-CoB×Channel1)/CPL (1)
wherein, Lux represents the illuminance of visible light in incident light L1;
channel0 represents the value of first digital signal D1 output by first optical Channel 321;
channel1 characterizes the value of the second digital signal D2 output by the second optical Channel 322;
the CoB represents the proportion coefficient of infrared light in the current light source.
For a single optical channel, the output digital signal and the received optical signal correspond to each other as follows:
Lux'＝k0×ADC (2)
wherein, Lux' represents the illumination of visible light in incident light;
the ADC represents the numerical value of the digital signal output by the optical channel;
k0characterizing the influence factors of the light channel and the folded screen.
Wherein k is0The light transmittance of the signal amplifying circuit and the folding screen in the optical channel is related to other factors. See, in particular, equations (3) and (4).
The CPL represents a digital signal value corresponding to each illumination light quantity received by the optical channel. The relationship between CPL and the light transmittances of the signal amplification circuit and the display panel is as follows.
CPL＝(Integral_time×Integral_gain)/(TA×DC) (4)
Wherein, Integral _ time represents the amplification integration time of the signal amplification circuit;
integral _ gain represents the Integral gain of the signal amplifying circuit;
TA represents the light transmittance of the folding screen;
DC characterizes other influencing factors.
In combination with equations (2) - (4), the first digital signal D1 output by the first optical channel 321 can represent the light intensity of the incident light L1; the second digital signal D2 output by the second optical channel 322 can represent the intensity of the infrared light in the incident light L1.
Further, combining the formulas (1) to (3), the formula (5) can be obtained
Lux＝k0×Channel0-k1×Channel1 (5)
Channel0, Channel1, and Lux values were measured directly by testing different types of light sources (e.g., cold light source, warm light source, natural light source, etc.). Therefore, k corresponding to different kinds of light sources is determined according to equation (5)0And k1. Further, a preset algorithm adopted by the control module 400 is obtained through an iterative fitting algorithm.
In a second aspect, an embodiment of the present disclosure provides a terminal device. Fig. 11 to 13 are schematic structural diagrams of terminal devices shown according to different exemplary embodiments.
As shown in fig. 11 to 13, the terminal device includes: a folding screen 100, and an ambient light detection circuit as provided in the first aspect above.
The folding screen 100 includes a first portion 110 and a second portion 120 that are foldable relative to each other. The at least one ambient light sensor 300 of the ambient light detection circuit is arranged in correspondence with the first portion 110 and the at least one ambient light sensor 300 is arranged in correspondence with the second portion 120.
There are various ways to cooperate the foldable screen 100 with the ambient light sensor 300.
As an example, as shown in fig. 11, a light-transmitting hole 130 is provided on the folding screen 100, and an ambient light sensor 300 is provided corresponding to the light-transmitting hole 130.
As an example, as shown in fig. 12, a slit 140 is provided on the folding screen 100 (for example, the slit 140 is provided in a black border area between the folding screen 100 and a middle frame of the terminal device), and the ambient light sensor 300 is provided corresponding to the slit 140.
As an example, as shown in fig. 13, a light-transmitting region 150 is provided on the folding screen 100, and the ambient light sensor 300 is attached to the back surface of the folding screen 100 corresponding to the light-transmitting region 150.
In addition, in the above three examples, it is preferable that the light scattering member 310 is attached to the folding screen 100 so that as much incident light L1 as possible passes through the light scattering member 310 to form scattered light L2, thereby further optimizing the detection accuracy of the environmental sensor 300.
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.
Claims (11)
1. An ambient light detection circuit, wherein the circuit cooperates with a folding screen, the folding screen comprising a first portion and a second portion that are foldable relative to one another; the circuit comprises:
a detection module for detecting the relative position of the first part and the second part;
at least two ambient light sensors respectively corresponding to the first part and the second part and used for detecting the intensity of ambient light; and
and the control module is connected with the detection module and the at least two ambient light sensors and used for enabling the ambient light sensors corresponding to the first part and/or the second part according to the relative positions.
2. The circuit of claim 1, wherein the relative position comprises the first and second portions being disposed upwardly and coplanar;
the control module enables an ambient light sensor corresponding to the first portion and the second portion in response to the first portion and the second portion being disposed upwardly and coplanar.
3. The circuit of claim 1, wherein the relative position comprises the first portion being located over the second portion;
the control module enables the ambient light sensor corresponding to the first portion and disables the ambient light sensor corresponding to the second portion in response to the first portion being located over the second portion.
4. The circuit of claim 1, wherein the relative position comprises the second portion being located over the first portion;
the control module enables the ambient light sensor corresponding to the second portion and disables the ambient light sensor corresponding to the first portion in response to the second portion being located above the first portion.
5. The circuit of claim 1, wherein the ambient light sensor comprises:
a light scattering member that converts incident light into scattered light; and
the signal conversion module is used for receiving the scattered light and obtaining a first digital signal and a second digital signal according to the scattered light;
the first digital signal is positively correlated with the light intensity of the incident light, and the second digital signal is positively correlated with the light intensity of the infrared light in the incident light.
6. The circuit of claim 5, wherein the signal conversion module comprises:
a first optical channel for receiving the scattered light and converting the scattered light into the first digital signal; and
and the second optical channel is used for receiving the infrared light in the scattered light and converting the infrared light into the first digital signal.
7. The circuit of claim 6, wherein the first optical channel comprises:
a first photoelectric conversion element for converting the scattered light into a first initial electrical signal;
a first signal amplification circuit that converts the first initial electrical signal into a first amplified electrical signal; and
a first analog-to-digital conversion circuit that converts the first amplified electrical signal to the first digital signal.
8. The circuit of claim 6, wherein the second optical channel comprises:
the second photoelectric conversion part is used for converting the infrared light in the scattered light into a second initial electric signal;
a second signal amplification circuit that converts the second initial electrical signal into a second amplified electrical signal; and
a second analog-to-digital conversion circuit that converts the second amplified electrical signal to the second digital signal.
9. The circuit of claim 1, wherein the detection module comprises: an angle sensor and/or an acceleration sensor.
10. A terminal device, characterized in that the terminal device comprises: a folding screen, and the ambient light detection circuit of any one of claims 1-9;
the folding screen comprises a first part and a second part which can be folded oppositely;
at least two ambient light sensors in the ambient light detection circuit are provided corresponding to the first portion and the second portion, respectively.
11. The terminal device according to claim 10, wherein a light hole is provided on the folding screen, and the ambient light sensor is provided corresponding to the light hole; alternatively, the first and second electrodes may be,
a gap is arranged on the folding screen, and the ambient light sensor is arranged corresponding to the gap; alternatively, the first and second electrodes may be,
the folding screen is provided with a light transmission area, and the ambient light sensor corresponds to the light transmission area and is attached to the back of the folding screen.
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