CN111366242B - Ambient light detection device and terminal device - Google Patents
Ambient light detection device and terminal device Download PDFInfo
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- CN111366242B CN111366242B CN202010459076.6A CN202010459076A CN111366242B CN 111366242 B CN111366242 B CN 111366242B CN 202010459076 A CN202010459076 A CN 202010459076A CN 111366242 B CN111366242 B CN 111366242B
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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 the technical field of electronic equipment, and particularly provides an ambient light detection device and terminal equipment. Wherein the detection device is arranged below the screen component and the screenThe subassembly is including piling up apron layer, first polaroid, first light time delay piece, luminescent layer and the supporting film that sets up in proper order, and the device includes: the first sensor and the second sensor are arranged in parallel, and sensing ends of the first sensor and the second sensor face the screen assembly; a second light time delay piece is arranged between the sensing end of the second sensor and the screen component, a second polaroid is arranged between the second light time delay piece and the sensing end of the second sensor, and the second polaroid is used for blocking ambient light passing through the second light time delay piece; polarized light of ambient light after passing through the first light delay sheet, the support film and the second light delay sheet in sequenceoLight and lighteA phase difference of light ofnπ，nIs a positive integer. The device can realize the detection of the light intensity of the environment under the screen, and the detection precision is higher.
Description
Technical Field
The disclosure relates to the technical field of electronic equipment, in particular to an ambient light detection device and terminal equipment.
Background
With the development of mobile devices, screens have become the primary means of human-computer interaction. The full-screen device has a very high screen occupation ratio, and can provide better visual effect and interactive experience for users, so that the full-screen device becomes an important development direction of the mobile device.
In a smart phone, in order to increase the screen occupation ratio of the front of the phone, various sensors of the smart phone must be disposed under the screen. For example, the ambient light sensor is used for acquiring the ambient natural light intensity through the mobile phone to adjust the screen brightness. Therefore, how to realize the detection of the ambient light under the screen becomes a problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problem of the detection of the environment under the screen, the embodiment of the present disclosure provides an environment detection device and a terminal device.
In a first aspect, the present disclosure provides an ambient light detection device, which is disposed below a screen assembly, the screen assembly includes a cover plate layer, a first polarizer, a first optical delay sheet, a light emitting layer, and a support film, the device includes:
the first sensor and the second sensor are arranged in parallel, and sensing ends of the first sensor and the second sensor face the screen assembly; a second optical time delay piece is arranged between the sensing end of the second sensor and the screen assembly, a second polaroid is arranged between the second optical time delay piece and the sensing end of the second sensor, and the second polaroid is used for blocking light rays passing through the second optical time delay piece;
after the ambient light sequentially passes through the first light delay sheet, the supporting film and the second light delay sheet, the polarized light of the ambient lightoLight and lighteA phase difference of light ofnπ，nIs a positive integer.
In some embodiments, the apparatus further comprises:
the filter layer is used for absorbing ambient light of a first waveband, and the wavelength of the first waveband is more than 700 nm;
the filter layer is an optical filter arranged in front of the optical path of the first polaroid and/or the second polaroid; or
The filter layer is made of light absorption materials arranged on the first polaroid and/or the second polaroid.
In some embodiments, whennWhen the number of the polarizing plates is odd, the polarization directions of the first polarizing plate and the second polarizing plate are parallel;
when in usenAnd when the number of the polarizing films is even, the polarization directions of the first polarizing film and the second polarizing film are vertical.
In some embodiments, ambient light passing through the first light retarder has a first phase difference in its polarization; after the ambient light passes through the supporting film, the phase difference of the polarized light is a second phase difference, and the sum of the first phase difference and the second phase difference is
(ii) a The second light time delay plate is a quarter-wave plate.
In some embodiments, ambient light passing through the second light retarder has a third retardation; after the ambient light passes through the supporting film, the phase difference of the polarized light is a fourth phase difference, and the sum of the third phase difference and the fourth phase difference is
(ii) a The first light time delay plate is a quarter-wave plate.
In some embodiments, the second polarizer and the second optical delay sheet are disposed on the optical coating of the sensing end of the second sensor.
In some embodiments, the second optical delay sheet comprises a plurality of stacked sub-delay sheets.
In some embodiments, an isolator is disposed between the first sensor and the second sensor.
In a second aspect, the disclosed embodiments provide a terminal device, including the apparatus according to any one of the embodiments of the first aspect.
In some embodiments, the terminal device is a mobile phone.
The ambient light detection device provided by the embodiment of the disclosure is arranged below the screen assembly and comprises a first sensor and a second sensor which are arranged in parallel, and the sensing ends of the first sensor and the second sensor face the screen assembly, so that the ambient light detection device receives light intensity from one side of the screen assembly. And a second light time delay sheet and a second polaroid are arranged between the sensing end of the second sensor and the screen assembly, and the second polaroid is used for blocking light rays passing through the second light time delay sheet. Therefore, the first sensor receives light leakage of the light emitting layer and ambient light passing through the screen assembly, the second sensor only receives light leakage of the light emitting layer, and ambient light intensity can be obtained by utilizing a difference value of the first sensor and the second sensor, so that ambient light detection under the screen is realized. And after the ambient light sequentially passes through the first light delay sheet, the supporting film and the second light delay sheet, the polarized light of the ambient lightoLight and lightePhase difference of lightnπ，nThe phase difference of the polarized light of the screen assembly and the second light delay sheet is considered as a whole in the disclosure, so that the phase difference of the polarized light finally reaching the second polarizer isnThe pi linearly polarized light enables the second polarizer to almost completely filter the interference of the ambient light to the second sensor, and improves the detection precision of the ambient light intensity.
The ambient light detection device provided by the embodiment of the present disclosure further includes a filter layer for absorbing ambient light in a first wavelength band, where the wavelength of the first wavelength band is greater than 700 nm. The filter layer is a filter arranged in front of the light path of the first polaroid and/or the second polaroid, or is a light absorption material arranged on the first polaroid and/or the second polaroid. The filter layer filters the ambient light with long wave band (more than 700 nm), thereby eliminating the problem that the ambient light enters the second sensor due to the high transmittance of the light with long wave band, and further improving the detection accuracy.
The terminal device provided by the embodiment of the present disclosure includes the above-mentioned ambient light detection apparatus, and therefore has the above-mentioned beneficial effects, which are not described again.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an ambient light detection device according to some embodiments of the present disclosure.
FIG. 2 shows the transmittance of light with different wavelengths after passing through the supporting film, the light delay sheet and the polarizer in sequence.
Detailed Description
The technical solutions of the present disclosure will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure. In addition, technical features involved in different embodiments of the present disclosure described below may be combined with each other as long as they do not conflict with each other.
The ambient light detection device provided by the embodiment of the disclosure is suitable for detecting the ambient light under the screen of electronic equipment, such as a full-screen mobile phone. Therefore, the ambient light intensity can be accurately detected below the screen assembly, holes do not need to be formed in the screen assembly or the mobile phone frame, and the mobile phone screen occupation ratio is improved.
Screen assembly refers to a display screen stack-up assembly of a device, such as a common lcd display screen assembly, oled assembly, etc., and the present disclosure is not limited thereto. In fig. 1, the oled is illustrated as an example, and the screen assembly sequentially includes, from top to bottom, a cover plate layer 10, a first polarizer 20, a first retardation film 30, a light emitting layer 40, and a support film 50, which are closely stacked, and for clarity of the drawing, an exploded structure is shown in fig. 1. The cover layer 10 is a screen outer cover, such as a common glass cover or the like. The luminescent layer 40 serves as a light source of the screen assembly, which remains normally bright in the energized state. The first polarizer 20 and the first light delay sheet 30 cooperate with the light emitting layer 40 to realize screen display, and for the display principle of the screen, reference may be made to an oled principle in the related art, which is not described herein again. The support film 50 is a support structure for the screen assembly to fit to the device housing or the middle frame, and has a certain thickness, so as to provide a certain assembly height for the screen assembly, and can be made of, for example, PET.
In the implementation of the ambient light detection, although the screen elements are made of highly transparent materials, the ambient light can directly penetrate to the back side of the screen elements, but as can be seen from the above, the light emitting layer 40 of the oled elements is a light source, and it also generates light leakage at the back side of the screen elements. For example, when a user uses a mobile phone, the light emitting layer 40 is kept in a normally bright state, and if a sensor is directly arranged below the screen, the sensor receives light leakage and ambient light of the light emitting layer 40, and cannot accurately detect the current real ambient light intensity, so that effective screen brightness adjustment cannot be realized for the user.
In order to solve the above problem and achieve the detection of the light intensity of the environment under the screen, in a first aspect, the present disclosure provides an environment light detection device, and some embodiments of the device of the present disclosure are shown in fig. 1.
For the sake of understanding, the terms of art and the principle of light polarization appearing hereinafter are briefly explained here.
A polarizer: refers to a lens that allows light vibrating in a particular direction to pass through, while blocking or reducing light passing through other vibration directions. The two polarizers are vertically overlapped with each other according to the polarization direction, so that all light rays can be prevented from passing through.
Optical time-delay sheet: normal light emitted when light vertically enters and passes (oLight) and abnormal light: (eLight) have a phase difference therebetween. E.g. quarter-wave plate, for the outgoing polarized lightoLight and lighteThe phase difference of the light is 1/4 wavelength, i.e.π/2。
Linearly polarized light: of light polarized when passing through the optical retarderoLight and lighteThe phase difference of light is 0 orπAnd then linearly polarized light is formed through compounding.
Elliptical polarized light: of light polarized when passing through the optical retarderoLight and lighteThe phase difference of the light is not equal to 0 orπAt/2, elliptical polarized light is formed in a composite mode.
Circularly polarized light: of light polarized when passing through the optical retarderoLight and lighteA phase difference of light ofπAt/2, circularly polarized light is formed. It can be seen that the quarter-wave plate can convert the linearly polarized light passing therethrough into circularly polarized light.
As shown in fig. 1, in some embodiments, the ambient light detection apparatus of the present disclosure includes a first sensor 100 and a second sensor 200, and the first sensor 100 and the second sensor 200 are disposed below the screen assembly and are arranged in parallel. The first sensor 100 and the second sensor 200 are light sensors, and sensing ends thereof can detect intensity of received light, so as to realize signal processing through a subsequent connection circuit, and the realization principle and hardware selection of the first sensor 100 and the second sensor 200 can be realized by those skilled in the art by referring to related technologies, which is not described herein again.
The sensing ends of the first and second sensors 100 and 200 face the screen assembly so that ambient light passing through the screen assembly or back-leakage light of the screen assembly can be received. Between the sensing end of the second sensor 200 and the screen assembly, a second light delay sheet 60 and a second polarizer 70 are sequentially arranged from top to bottom, and the second polarizer 70 is used for blocking the ambient light passing through the second light delay sheet 60, so as to prevent the ambient light from entering the sensing end of the second sensor 200.
From the foregoing, the second polarizer 70 can block light with a specific vibration direction from passing through, so that one core inventive concept of the disclosed solution is: by matching the second light delay sheet 60 with the screen assembly, the ambient light reaching the second polarizer 70 is linearly polarized light, and the vibration direction is perpendicular to the polarization direction of the second polarizer 70, so that the ambient light received by the second sensor 200 is completely blocked. The following detailed description of the principles and implementations is not presented here.
Continuing to refer to fig. 1, the light path is indicated by arrows, and it can be seen that the first sensor 100 can receive the leaked light La of the light emitting layer 40 and the ambient light Lb, while the second sensor 200 can receive only the leaked light Lc of the light emitting layer 40 without receiving the ambient light Ld due to the blocking of the second polarizer 70. Thus, by taking the difference between the signals of the two sensors, the real ambient light L can be obtained, which is expressed as:
in the formula (1), the reaction mixture is,
indicating the light intensity of the first sensor 100,
indicating the light intensity of the second sensor 200 and k the scaling factor. Since the light leakage received by the second sensor 200 passes through the second polarizer 70, there is an energy loss, and therefore the light leakage is corrected by using the proportionality coefficient k, which can be obtained according to the related parameters of the polarizer.
Therefore, in the embodiment of the present disclosure, the first sensor 100 and the second sensor 200 are used to obtain different light intensity signals, and then the difference is made to obtain the ambient light intensity, so that accurate ambient light detection can be realized under the screen, and the design requirement of the full-screen device is met.
Another core inventive concept of the disclosed embodiments is: polarized light arranged such that ambient light passes through the various layer elements in sequence, and reaches the second polarizer 70oLight and lighteA phase difference of light ofnAnd pi, namely linearly polarized light. In other words, the present disclosureEmbodiments consider time delay errors between elements, and by adjusting the parameters of the elements of each layer, the overall adjustment achieves more accurate ambient light blocking.
For example as shown in fig. 1. If the first optical delay sheet 30 and the second optical delay sheet 60 both use quarter-wave plates, theoretically, the ambient light first forms linearly polarized light after passing through the first polarizer 20, the linearly polarized light passes through the first optical delay sheet 30,olight and lighteThe light phase difference is pi/2 to form circularly polarized light, and the circularly polarized light passes through the second light delay piece 60 to have phase difference of pi/2 again, namelyoLight and lighteThe light phase difference pi forms linearly polarized light with the same vibration direction as before, and as long as the polarization direction of the second polarizer 70 is set to be perpendicular to the first polarizer 20, the ambient light can be theoretically blocked from transmitting.
However, the inventor of the present invention found that, if the retardation is performed by adding only the quarter-wave plate, the second sensor 200 still receives a large amount of ambient light transmission, and thus the detection result obtained by the method has a larger error compared to the on-screen scheme. Further research shows that, because the support film 50 has a certain thickness, a certain delay error may be generated when light passes through the support film due to a commonly selected PET material, for example, so that light actually passing through the screen assembly is not circularly polarized light but elliptically polarized light, and light reaching the second polarizer 70 is also elliptically polarized light, so that the second polarizer 70 cannot completely block light from passing through, and a part of ambient light enters the second sensor 20, which results in a detection error.
In order to solve the above problem, in the embodiments of the present disclosure, based on the aforementioned light blocking principle, the retardation differences of the first light retardation film 20, the support film 50 and the second light retardation film 60 are integrally adjusted, so that the ambient light reaching the second polarizer 70 has the phase difference ofnAnd pi linearly polarized light, so that ambient light can be almost completely blocked by the second polarizer 70.
In one example, ambient light passing through the first light retarder 20 has its polarized light phase-shifted by the first phase differenceφ 1 After the ambient light passes through the supporting film 50, the phase difference of the polarized light is the first phase differenceφ 2 ，φ 1+ φ 2 =π/2. That is, the first optical retardation plate 20 and the supporting film 50 together form a quarter-wave plate, and the second optical retardation plate 60 is configured as a quarter-wave plate. So that the ambient light generates a phase difference ofπ/2Then is delayed again by the second optical delay plate 60 (quarter wave plate)π/2Linearly polarized light is formed in the same direction as the previous vibration. The polarization direction of the second polarizer 70 is set to be perpendicular to the first polarizer 20, and the second polarizer 70 can block the linearly polarized light passing through the second light delay sheet 60, so that the second sensor 200 only receives screen leakage light.
In another example, ambient light passing through the second retarder 60 has a polarization with a third retardationφ3After the ambient light passes through the supporting film 50, the phase difference of the polarized light is the fourth phase differenceφ4，φ3 + φ4=π/2. That is, the second optical retardation plate 60 and the supporting film 50 together form a quarter-wave plate, and the first optical retardation plate 20 is configured as a quarter-wave plate. So that the ambient light generates a phase difference ofπ/2Then re-delayed by the supporting film 50 and the second light delaying sheet 60π/2Linearly polarized light is formed in the same direction as the previous vibration. The polarization direction of the second polarizer 70 is set to be perpendicular to the first polarizer 20, and the second polarizer 70 can block the linearly polarized light passing through the second light delay sheet 60, so that the second sensor 200 only receives screen leakage light.
The above description has been given of only two examples, but it will be understood by those skilled in the art that the core of the present embodiment is to make the light reaching the second polarizer 70 to be phase-differencenPi linearly polarized light, on this basis, there may be other embodiments, which are not enumerated by this disclosure. In addition, how to adjust the phase difference of the polarized light will be detailed below, and will not be described here for the moment.
Meanwhile, it can be understood that the line reaching the second polarizer 70 is deviatedThe light is vibrated,olight and lighteA phase difference of light ofnAnd pi. When in usenWhen the number of the polarizing films is even, it is described that the polarization direction of the polarized light is the same as the polarization direction of the polarized light passing through the first polarizer 20, so that the second polarizer 70 and the first polarizer 20 are vertically placed according to the polarization direction, and the light passing through the second light delay sheet 60 can be blocked. When innWhen the number of the polarized light is odd, it is described that the polarization direction of the polarized light is perpendicular to the polarization direction of the polarized light passing through the first polarizer 20, so that the second polarizer 70 and the first polarizer 20 are placed in parallel according to the polarization direction, and the light passing through the second light delay sheet 60 can be blocked. As will be appreciated by those skilled in the art.
As can be seen from the above, in the present embodiment, the polarization phase difference between the screen assembly and the second light retardation plate is adjusted as a whole, so that the polarization light finally reaching the second polarizer has the phase difference ofnPi linearly polarized light, so that the second polarizer can almost completely filter the interference of the ambient light to the second sensor, and the detection precision of the ambient light intensity is improved.
Further, in order to realize phase difference adjustment of polarized light reaching the second polarizer, some embodiments are given below.
When light of a certain wavelength passes through the retardation plate,olight and lightePhase difference of lightΔφExpressed as:
in the formula (2), the reaction mixture is,
is the wavelength of the incident light,
is respectively aseLight and lightoThe refractive index of the light is such that,dis the thickness of the time delay piece.
In one example, light waves are caused to pass through the screen assembly by varying the thickness of the first light delaying sheet 30, the support film 50 and the second light delaying sheet 60And the second light delay sheet 60, the polarization phase difference reaching the upper side of the second polarizer 70 isnπ. In the specific implementation, the thickness of only one element may be adjusted, or the thicknesses of a plurality of elements may be adjusted simultaneously. For example, for convenience of implementation, the retarder may be a quarter-wave plate in the related art, and the thickness of the support film 50 is only increased to adjust the phase difference, which is not limited by the present disclosure.
In another example, by changing the support film 50 and/or the two optical retarder pairsoLight and lighteThe refractive index of the light is such that the polarization phase difference of the light wave passing through the screen assembly and the second light delay sheet 60 and reaching the upper part of the second polarizer 70 isnπ。
In yet another example, since the refractive index is equal to the dielectric constant open root, it is possible to equivalently adjust by changing the dielectric constant of the support film 50 and/or the two optical retardersoLight and lighteRefractive index of light to ensure a polarization phase difference ofnπ。
In another example, based on the principle of liquid crystal display, the rotation of the polarization plane of light wave is realized by using strong magnetic field to form magneto-optical and electro-optical modulation modes to changeoLight and lighteThe phase difference of the light.
Therefore, in the embodiment of the present disclosure, the optical parameters of the support film and the optical retardation film are changed, so as to adjust and compensate the phase difference of the ambient light, and make the light reaching the upper portions of the two polarizers 70 be linearly polarized light, so that the light is blocked by the second polarizer 70, and the ambient light is effectively prevented from entering the second sensor 200.
In some embodiments, the second optical delay sheet 60 and the second polarizer 70 are directly disposed on the optical coating film of the sensing end of the second sensor 200, and the second optical delay sheet 60 may be composed of a plurality of sub-delay sheets stacked in multiple layers, so that each sub-delay sheet compensates for the phase difference of the light passing therethrough, so that the phase difference finally reaching the second polarizer 70 satisfies the linearly polarized light. The second optical delay sheet 60 and the second polarizer 70 are disposed on the sensor, which facilitates the processing and assembly of the device.
In some embodiments, as shown in fig. 1, a spacer 80 is disposed between the first sensor 100 and the second sensor 200 to prevent cross-talk between the two sensors.
In addition, the inventor finds that light with different wavelengths also affects the detection accuracy of the ambient light under the screen through further research. Fig. 2 is a graph showing the change of transmittance with wavelength of light after light passes through a support film, a retardation sheet, and a polarizer in this order, in which the horizontal axis represents the wavelength of incident light and the vertical axis represents the transmittance. The ambient light mainly refers to visible light, and the wavelength range of the visible light is about 400 nm-780 nm. As can be seen from fig. 2, when the wavelength of the incident light is in the long wavelength band exceeding 700nm, the energy of the external ambient light increases, so that the light passing through the time delay sheet forms an elliptical polarization, and even part of the light directly penetrates through the time delay sheet and the polarizer and enters the second sensor 200, thereby causing a detection error.
To solve the problem of inaccurate detection of ambient light in a long wavelength band (above 700 nm), in some embodiments of the present disclosure, the detection apparatus further includes:
the filter layer is used for absorbing ambient light of a first waveband, and the wavelength of the first waveband is larger than 700 nm.
Specifically, light above 700nm is close to the infrared component, which is not noticeable to human eyes, and the coated film and the photosensitive end above the photodiode of the photosensor are also small in photoelectric conversion with respect to light waves above 700 nm. Therefore, in the present embodiment, the filter layer is used to filter out light waves above 700nm, so as to prevent ambient light in a long wavelength band from entering the second sensor 200.
In one example, the filter layer may be a filter disposed before the optical path of the first and/or second polarizing plates 20 and 70. Thereby filtering out ambient light with wavelengths greater than 700 nm.
In another example, the filter layer may be a light absorbing material disposed on the first and/or second polarizing plates 20 and 70. Specifically, the polarizer itself allows light waves with a specific polarization direction to pass through, so that a material component for absorbing light in a long wavelength band can be directly added in the polarizer, so that the polarizer allows light waves with a specific polarization direction of a specific wavelength to pass through, and effectively filters ambient light with a wavelength greater than 700 nm.
Therefore, the filter layer filters the ambient light with long wavelength band (greater than 700 nm), so that the problem that the ambient light enters the second sensor due to high transmittance of the light with long wavelength band is solved, and the detection accuracy is further improved.
On the other hand, the embodiment of the present disclosure further provides a terminal device, which includes the detection apparatus in any one of the above embodiments. The terminal device can be an electronic device such as a smart phone and a tablet computer, ambient light intensity detection under a screen can be achieved through the detection device of the embodiment of the disclosure, the detection device is suitable for comprehensive screen devices, and the screen occupation ratio of the device is greatly improved.
It should be understood that the above embodiments are only examples for clearly illustrating the present invention, and are not intended to limit the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the present disclosure may be made without departing from the scope of the present disclosure.
Claims (9)
1. The utility model provides an ambient light detection device, its characterized in that locates the screen subassembly below, the screen subassembly is including piling up apron layer, first polaroid, first light time delay piece, luminescent layer and the supporting membrane that sets up in proper order, the device includes:
the first sensor and the second sensor are arranged in parallel, and sensing ends of the first sensor and the second sensor face the screen assembly; a second optical time delay piece is arranged between the sensing end of the second sensor and the screen assembly, a second polaroid is arranged between the second optical time delay piece and the sensing end of the second sensor, and the second polaroid is used for blocking ambient light passing through the second optical time delay piece;
after the ambient light sequentially passes through the first light delay sheet, the support film and the second light delay sheet,of polarized light thereofoLight and lighteA phase difference of light ofnπ，nIs a positive integer;
the device, still include:
the filter layer is used for absorbing ambient light of a first waveband, and the wavelength of the first waveband is more than 700 nm;
the filter layer is an optical filter arranged in front of the optical path of the first polaroid and/or the second polaroid; or
The filter layer is made of light absorption materials arranged on the first polaroid and/or the second polaroid.
2. The apparatus of claim 1,
when in usenWhen the number of the polarizing plates is odd, the polarization directions of the first polarizing plate and the second polarizing plate are parallel;
when in usenAnd when the number of the polarizing films is even, the polarization directions of the first polarizing film and the second polarizing film are vertical.
3. The apparatus of claim 1,
after the ambient light passes through the first light delay piece, the phase difference of the polarized light of the ambient light is a first phase difference; after the ambient light passes through the supporting film, the phase difference of the polarized light is a second phase difference, and the sum of the first phase difference and the second phase difference is
(ii) a The second light time delay plate is a quarter-wave plate.
4. The apparatus of claim 1,
after the ambient light passes through the second light delay sheet, the phase difference of the polarized light is a third phase difference; after the ambient light passes through the supporting film, the phase difference of the polarized light is a fourth phase difference, and the sum of the third phase difference and the fourth phase difference is
(ii) a The first light time delay plate is a quarter-wave plate.
5. The apparatus of claim 3,
the second polarizer and the second optical time delay sheet are arranged on the optical coating film of the sensing end of the second sensor.
6. The apparatus of claim 5,
the second optical delay sheet includes a plurality of stacked sub-delay sheets.
7. The apparatus of claim 1,
an isolator is disposed between the first sensor and the second sensor.
8. A terminal device, characterized in that it comprises an apparatus according to any one of claims 1 to 7.
9. The terminal device according to claim 8, wherein the terminal device is a mobile phone.
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| CN112449034A (en) * | 2019-08-30 | 2021-03-05 | 北京小米移动软件有限公司 | Mobile terminal |
| TWI770651B (en) * | 2019-10-28 | 2022-07-11 | 昇佳電子股份有限公司 | Light sensor module |
| CN111917906A (en) * | 2020-08-05 | 2020-11-10 | 维沃移动通信有限公司 | Electronic device |
| CN111933665B (en) | 2020-08-05 | 2023-04-07 | 维沃移动通信有限公司 | Display module and electronic equipment |
| CN111964778A (en) * | 2020-08-21 | 2020-11-20 | 深圳市汇顶科技股份有限公司 | Under-screen environment optical sensor and terminal equipment |
| CN111998940B (en) * | 2020-08-28 | 2023-09-05 | Oppo广东移动通信有限公司 | Display screen assembly, electronic equipment and ambient light intensity detection method |
| CN111968607B (en) * | 2020-08-28 | 2022-11-01 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968602B (en) * | 2020-08-28 | 2022-03-25 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968603B (en) * | 2020-08-28 | 2022-01-07 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968601B (en) * | 2020-08-28 | 2022-03-01 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968606A (en) * | 2020-08-28 | 2020-11-20 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968599B (en) * | 2020-08-28 | 2022-02-22 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968600B (en) * | 2020-08-28 | 2022-03-25 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111988456A (en) * | 2020-08-28 | 2020-11-24 | Oppo广东移动通信有限公司 | Display screen assembly, electronic device and ambient light detection method |
| CN111968604B (en) * | 2020-08-28 | 2022-01-07 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN111968598B (en) * | 2020-08-28 | 2022-02-22 | Oppo广东移动通信有限公司 | Display device, electronic apparatus, and control method of electronic apparatus |
| CN112068235A (en) * | 2020-09-09 | 2020-12-11 | Oppo广东移动通信有限公司 | Preparation method, metal wire grating polaroid, display device and electronic equipment |
| CN112082644A (en) * | 2020-09-14 | 2020-12-15 | 深圳市汇顶科技股份有限公司 | Under-screen environment optical sensor and terminal equipment |
| CN113241016B (en) * | 2021-06-03 | 2023-03-14 | 维沃移动通信有限公司 | Electronic device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107153283A (en) * | 2017-07-21 | 2017-09-12 | 京东方科技集团股份有限公司 | Liquid crystal display device and light detection method |
| CN107909922A (en) * | 2017-11-16 | 2018-04-13 | 维沃移动通信有限公司 | A kind of mobile terminal |
| CN109036163A (en) * | 2018-08-31 | 2018-12-18 | 京东方科技集团股份有限公司 | A kind of display device and its environment light detection method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010243647A (en) * | 2009-04-02 | 2010-10-28 | Toppoly Optoelectronics Corp | Display device and electronic device with the same |
| US9612152B2 (en) * | 2013-11-07 | 2017-04-04 | Apple Inc. | Ambient light sensor with internal light cancellation |
| CN107241467B (en) * | 2017-05-11 | 2020-08-07 | Oppo广东移动通信有限公司 | Electronic device |
| CN114353937A (en) * | 2017-08-22 | 2022-04-15 | 华为技术有限公司 | Optical sensor and terminal equipment |
| CN108881538A (en) * | 2018-06-22 | 2018-11-23 | 北京小米移动软件有限公司 | Mobile terminal |
-
2020
- 2020-05-27 CN CN202010459076.6A patent/CN111366242B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107153283A (en) * | 2017-07-21 | 2017-09-12 | 京东方科技集团股份有限公司 | Liquid crystal display device and light detection method |
| CN107909922A (en) * | 2017-11-16 | 2018-04-13 | 维沃移动通信有限公司 | A kind of mobile terminal |
| CN109036163A (en) * | 2018-08-31 | 2018-12-18 | 京东方科技集团股份有限公司 | A kind of display device and its environment light detection method |
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|---|---|
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