WO2019037723A1 - Photocapteur et dispositif terminal - Google Patents

Photocapteur et dispositif terminal Download PDF

Info

Publication number
WO2019037723A1
WO2019037723A1 PCT/CN2018/101582 CN2018101582W WO2019037723A1 WO 2019037723 A1 WO2019037723 A1 WO 2019037723A1 CN 2018101582 W CN2018101582 W CN 2018101582W WO 2019037723 A1 WO2019037723 A1 WO 2019037723A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
phase retardation
retardation film
photodetector
mixed
Prior art date
Application number
PCT/CN2018/101582
Other languages
English (en)
Chinese (zh)
Inventor
王辉
魏文雄
瞿高鹏
郭伟
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201711083552.3A external-priority patent/CN109425427A/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18847658.4A priority Critical patent/EP3671146B1/fr
Priority to KR1020207008088A priority patent/KR20200042518A/ko
Publication of WO2019037723A1 publication Critical patent/WO2019037723A1/fr
Priority to US16/797,383 priority patent/US10782185B2/en

Links

Images

Classifications

    • 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
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones

Definitions

  • the present application relates to the field of optical sensors, and in particular, to a light sensor and a terminal device.
  • an ambient light sensor In the current mobile phone or wearable device, in order to realize adaptive brightness adjustment of the screen according to the ambient light intensity, an ambient light sensor needs to be configured to realize light detection. With the simplification of the structure, the appearance and the like, it is necessary to place the light sensor on the back of the screen to achieve a full-screen display effect. That is to say, the ambient light sensor receives not only natural ambient light through a display such as an OLED screen, but also non-ambient light emitted by the display itself, such as non-polarized light, non-ambient light and through the display. The ambient light is simultaneously received by the underlying light sensor, causing light detection interference, resulting in the ambient light not being accurately detected.
  • the embodiment of the present application provides a light sensor for solving the problem that the ambient light cannot be accurately detected due to light detection interference existing in the prior art.
  • the present application provides a light sensor including at least one light sensor sub-module, each of the light sensor sub-modules including a first photodetector, a second photodetector, a first linear polarizer, and a second linear polarization a first phase retardation film and a second phase retardation film; wherein the first photodetector and the second photodetector are disposed adjacent to each other; the first linear polarizer is located above the first photodetector; The second linear polarizer is located above the second photodetector, the first phase retardation film is located above the first linear polarizer, and the two phase retardation film is located above the second linear polarizer; a first photodetector is configured to obtain a light intensity of the first mixed light after the mixed light passes through the first phase retardation film and the first linear polarizing film, and the second photodetector is configured to acquire the mixed light passing through the The light intensity of the second phase retardation film and the second mixed light after the
  • the light sensor can filter out other light than the natural ambient light, and avoid detecting the received interference, resulting in inaccurate detection results.
  • the first phase retardation film and the second phase retardation film may be converted for circularly polarized light for the first light.
  • the first photodetector and the second photodetector may be connected to each other.
  • the first linear polarizer and the second linear polarizer are on the same level.
  • the first light is circularly polarized light formed by ambient light passing through a display screen provided with a circular polarizing plate; the second light is light emitted by the display screen itself (such as light emitted from a self-illuminating pixel or backlight) Light from the lamp).
  • the effect of ambient light outside the display on the brightness of the display can be detected by the light detector.
  • circular polarizing plate refers to a device capable of converting unpolarized light into circularly polarized light
  • its specific implementation form is not limited, for example, it can pass multiple discrete devices (such as The phase retardation film and the linearly polarizing plate are composed of a single device (such as a device in which a phase retardation film and a linear polarizing film are packaged, or a device that realizes the function by designing other structures).
  • the polarization direction of the first linear polarizing plate is consistent with the polarization direction of the first light ray before passing through the first linear polarizing plate, and the polarization direction of the first light ray is orthogonal to the second polarizing plate direction. In this way, a difference between the intensity of the light entering the first photodetector and the intensity of the second photodetector group can be made, and the intensity of the light to be detected can be obtained by the difference of the light intensities.
  • the first light is circularly polarized light, and the first light is converted into first linearly polarized light having the same polarization direction as the first linear polarizer by the first phase retardation film, the first Light passing through the second phase retardation film and then converted into second linearly polarized light orthogonal to a polarization direction of the second linear polarizer, such that the second linearly polarized light is filtered while passing through the second linear polarizer;
  • the light is unpolarized light, and the second light passes through the first phase retardation film and then forms a third linearly polarized light through the first linear polarizer, and the second light passes through the second phase retardation film
  • the second linear polarizer forms a fourth linearly polarized light, the first mixed light includes a first linearly polarized light and the third linearly polarized light, and the second mixed light includes the fourth linearly polarized light, wherein
  • the light intensity of the three-line polarized light is the same as the light intensity of the fourth linearly polarized light
  • the photosensor sub-module is a plurality of and arranged in a matrix, and in a matrix formed by the plurality of photosensor sub-modules, the first photodetector and the second photodetector are staggered.
  • the light intensity detected by the light sensor is the sum of the light intensities detected by the plurality of photosensor sub-modules, and is designed and arranged in combination with the actual requirements of the photosensor to achieve a better detection effect.
  • the present application provides a light sensor including at least one light sensor sub-module, each of the light sensor sub-modules including a first photodetector and a second photodetector disposed adjacent to the first photodetector; a linear polarizing plate positioned above the first photodetector; a second linear polarizing plate positioned above the second photodetector, the first photodetector for obtaining mixed light after passing through the first linear polarizing plate a first mixed light intensity, the second photodetector is configured to acquire a second mixed light intensity of the mixed light after passing through the second linear polarizing plate, wherein the mixed light includes a first light and a second light.
  • the present application discloses a light sensor including at least one light sensor sub-module, each of the light sensor sub-modules of the present application includes a first photodetector, a second photodetector, a first linear polarizer, and a second line. a polarizing plate, a first phase retardation film, and a second phase retardation film, wherein:
  • the first linear polarizing plate of the present application is located above the first photodetector of the present application;
  • the second linear polarizing plate of the present application is located above the second photodetector of the present application.
  • the first phase retardation film of the present application is located above the first linear polarizing plate of the present application;
  • the second phase retardation film of the present application is located above the second linear polarizing plate of the present application;
  • the fast axis direction of the first phase retardation film is consistent with the fast axis direction of the second phase retardation film; or the slow axis direction of the first phase retardation film is slower than the second phase retardation film
  • the axes are in the same direction;
  • the first phase retardation film is integrally formed with the second phase retardation film, or separately formed.
  • the processor is disposed on one side or the bottom of the first photodetector or the second photodetector, or through a circuit board and light Sensor connection.
  • the present application further discloses a light sensor including at least one light sensor sub-module, each of the light sensor sub-modules including a first photodetector, a second photodetector, a first linear polarizer, and a first a two-line polarizing plate, a first phase retardation film, and a second phase retardation film, wherein:
  • the first photodetector and the second photodetector are disposed adjacent to each other;
  • the first linear polarizing plate is located above the first photodetector
  • the first phase retardation film is located above the first linear polarizing plate
  • the second phase retardation film is located above the second linear polarizing film
  • the first photodetector and the second photodetector are disposed adjacent to each other;
  • the first linear polarizing plate is located above the first photodetector
  • the second linear polarizing plate is located above the second photodetector
  • the first phase retardation film is located above the first linear polarizing plate
  • the second phase retardation film is located above the second linear polarizing film
  • the first photodetector is configured to acquire a light intensity of the first mixed light after the mixed light passes through the first phase retardation film and the first linear polarizing film
  • the second photodetector is configured to acquire the mixed light a light intensity of the second mixed light after passing through the second phase retardation film and the second linear polarizing film
  • the present application provides a terminal device, including a display screen, the display screen includes a phase retardation film, a linear polarizing film, and a transparent cover plate, and further includes the light sensor described in the above various aspects and various implementation manners.
  • the mixed light is mixed with a first light formed by the ambient light passing through the display screen and a second light formed by the light of the display screen itself, and the light sensor outputs the light intensity of the ambient light to the terminal device to adjust the brightness of the display screen.
  • the light sensor outputs the light intensity of the ambient light to the terminal device to adjust the brightness of the display screen, thereby ensuring the accuracy of the sensing, so that the display screen can correctly adjust the display light intensity.
  • the terminal device can accurately detect the light intensity of the external ambient light through the light sensor, and avoid the influence of the light of the terminal device itself on the detection effect.
  • the present application provides a terminal device, including: a processor and a light sensor as provided in the foregoing aspects and various implementations, the processor for using the first mixed light intensity and the The light intensity of the two mixed lights is processed.
  • the light sensor described in the present application first converts ambient light and other interference light, that is, two different properties, into the same type of polarized light, and then obtains and generates a light intensity difference through the first photodetector and the second photodetector.
  • the difference in light intensity is the desired light intensity converted by ambient light. In this way, the intensity of the light other than the natural ambient light acquired by the light sensor can be avoided and output, and the detection result is inaccurate without interference.
  • FIG. 1 is a side elevational view of an embodiment of a light sensor of the present application
  • FIG. 3 is a schematic view of another embodiment of the photosensor described in the present application.
  • FIG. 5 is a schematic diagram of a terminal device according to the present application.
  • Linear polarizer also called a linear polarizer, or a linear polarizer.
  • the linear polarizer has a function of shielding (also can be understood as “filtering”, “blocking”) and transmission through the incident light, so that the longitudinal light or the lateral light can be transmitted, and the one is shielded (filtered or blocked). ). After passing natural light through a linear polarizer, only one direction of polarized light can pass through the device, and we get linearly polarized light.
  • Phase retardation film also known as phase retardation diaphragm, phase retarder, or waveplate. It is machined from a material with birefringence that adjusts the polarization state of the beam.
  • the wave plate has two mutually perpendicular optical axes (fast axis and slow axis). When the light passes through the wave plate, the light transmitted in a certain direction is faster. This direction is called the fast axis, corresponding to its vertical direction, the light The transmission speed is slow, called the slow axis.
  • the light incident wave plate When the polarization direction of the incident light is at an angle of 45 degrees to the fast axis direction of the wave plate, the light incident wave plate is decomposed into two beams of the same intensity and phase but the polarization direction is perpendicular, one beam is parallel to the fast axis, and one beam is parallel slow.
  • the axis because the transmission speed of the fast and slow axis light is different, the two beams will have a phase difference when passing through the wave plate. After passing, the two beams recombine a beam of light, but since the phases of the two beams are different, the new one The beam will also exhibit different polarization states. If the phase difference is 180°, the wave plate is called a 1/2 wave plate or a half wave plate, and the polarization direction of the outgoing light passing through the 1/2 wave plate is perpendicular to the polarization direction of the incident light.
  • optical sensor sub-module 10A takes an optical sensor sub-module 10A as an example for description. Specifically:
  • the second light B is unpolarized light generated by the light emitted by the display itself (such as the light of the backlight or the light emitted by the self-luminous pixel), and the second light B does not undergo polarization conversion through the first phase retardation film 151, and then
  • the first linear polarizer B1 is formed by the first linear polarizer B1, and is obtained by the first photodetector 11;
  • the second ray B passes through the second phase retardation film 152 and then passes through the second linear polarizer 14 to form the fourth linearly polarized light B2.
  • the first mixed light includes first linearly polarized light A1 and third linearly polarized light B1
  • the second mixed light includes fourth linearly polarized light B2.
  • the light intensity of the third linearly polarized light B1 is the same as the light intensity of the fourth linearly polarized light B2, in fact, the light after the second light is converted into the polarized direction by the same light, and the light intensity is the same as the second light, that is, It is said that the light intensity is constant before and after the conversion, so that the difference between the first mixed light intensity and the second mixed light intensity is the first line obtained after the mixed light passes through the first phase retardation film 151 and the first linear polarizing film 13.
  • the light sensor of the present application is used for detecting the light intensity of the ambient light in the outside world, and first converting the ambient light and other interference light, that is, two different properties, into the first mixed light and the second mixed light, and passes through the first light detector.
  • 11 acquiring the first mixed light
  • the second photodetector 12 acquiring the second mixed light, causing the intensity of the light acquired by the second photodetector 12 of the first photodetector 11 to generate a difference in intensity, and then extracting the intensity difference by processing, It is the light intensity of the first light A converted by ambient light. In this way, the intensity of the light other than the natural ambient light acquired by the light sensor can be avoided and output, and the detection result is inaccurate without interference.
  • the fast axis directions of the two phase retardation films (151, 152) may be orthogonal (vertical) to each other such that the first ray A (circularly polarized light) passes through two phases.
  • the retardation film (151, 152) After the retardation film (151, 152), the polarization directions of the two paths of polarized light A1 and A2 are orthogonal.
  • the polarization directions of the two linear polarizing plates (13, 14) are set to be the same at this time, and at the same time, orthogonal to the direction of one of the linearly polarized lights, so that one of the linearly polarized lights can be filtered out.
  • the polarization directions of the two linear polarizing plates (13, 14) are the same as those of the first linearly polarized light A1, so that since the second linearly polarized light A2 is orthogonal to the polarization direction of A1, A2 will It is filtered by the second linear polarizing plate 14.
  • the remaining optical paths and corresponding processing can be referred to the description for FIG. 2A, and details are not described herein again.
  • the photo sensor further includes a processor 10B for acquiring the sum of the intensities of the first light A and the second light B detected by the first photodetector 11 and the second photodetector 12
  • the light intensity of the second light B, and the difference between the light intensity signal of the first light detector 11 and the light intensity signal detected by the second light detector 12, that is, the light intensity signal of the first light A, that is, after the conversion The light intensity of the first linearly polarized light A1.
  • the processor 10B may be integrated in the light sensor at the side or the bottom of the first photodetector 11 and the second photodetector 12, and may be carried by a circuit board and associated with the first photodetector 11 and the second light.
  • the detector 12 is connected.
  • the photosensor sub-module is a plurality of and arranged in a matrix, and in a matrix formed by a plurality of photosensor sub-modules, the first photodetector 11 and the second photodetector 12 are staggered. Multiple photosensor sub-modules may or may not be connected. As shown, each of the first photodetectors 11 is provided with a second photodetector 12 on one side thereof, and there are no two first photodetectors 11 or second rays continuously in the same horizontal or vertical row. Detector 12. The plurality of first photodetectors 11 and the plurality of second photodetectors 12 are arranged in a matrix.
  • a mobile phone which is a mobile phone, a tablet computer, or a wearable device having a screen.
  • a mobile phone is taken as an example. It includes a display screen 30, a processor 35 (for example, a CPU chip of a Qualcomm Qualcomm Snapdragon series, or a processor such as a chip of the Hess Kirin series) and a light sensor 10 disposed under the display screen 30, and the display screen 30 includes The laminated phase retardation film 31, the linear polarizing plate 32 and the transparent cover 33, the ambient light is converted into the first light A through the transparent cover 33, the linear polarizing plate 32, the phase retardation film 31 and the display screen 30, and the display screen 30 itself
  • the emitted light is the second light B, and the first light A and the second light B are mixed light, which are detected by the light detector, and the processor 10B of the light sensor is used to acquire the first light and the first light detector 11
  • the light sensor detects whether the light of the use environment is sufficient.
  • the unpolarized light is converted into circularly polarized light, and the LED light of the display screen.
  • Forming mixed light into the photosensor replacing the first phase retardation film 151 with the second phase retardation film 152, the first linear polarizing film 13 and the second linear polarizing film 14, and finally being replaced by the first photodetector 11 and the second light
  • the detector 12 acquires and produces a difference in light intensity, which is exactly the value of the light intensity of the ambient light.

Abstract

L'invention concerne un photocapteur (10) et un dispositif terminal (100). Le photocapteur (10) comprend au moins un sous-module de photocapteur. Chaque sous-module de photocapteur comprend un premier photodétecteur (11), un second photodétecteur (12), une première plaque de polarisation linéaire (13), une seconde plaque de polarisation linéaire (14), un premier film à retard de phase (151) et un second film à retard de phase (152). Le premier photodétecteur est destiné à acquérir une intensité lumineuse d'une première lumière mélangée d'une lumière mélangée qui a traversé le premier film à retard de phase et la première plaque de polarisation linéaire, et le second photodétecteur est destiné à acquérir une intensité lumineuse d'une seconde lumière mélangée de la lumière mélangée qui a traversé le second film à retard de phase et la seconde plaque de polarisation linéaire, la lumière mélangée comprenant un premier faisceau lumineux (A) et un second faisceau lumineux (B). Après le passage de la lumière mélangée par la seconde plaque de polarisation linéaire, un premier faisceau lumineux est filtré de telle sorte qu'une différence entre l'intensité lumineuse de la première lumière mélangée et l'intensité lumineuse de la seconde lumière mélangée est une intensité lumineuse d'un faisceau lumineux (A1) du premier faisceau lumineux qui a traversé le premier film à retard de phase et la première plaque de polarisation linéaire.
PCT/CN2018/101582 2017-08-22 2018-08-21 Photocapteur et dispositif terminal WO2019037723A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18847658.4A EP3671146B1 (fr) 2017-08-22 2018-08-21 Photocapteur
KR1020207008088A KR20200042518A (ko) 2017-08-22 2018-08-21 광 센서 및 단말 디바이스
US16/797,383 US10782185B2 (en) 2017-08-22 2020-02-21 Light sensor and terminal device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201710732235 2017-08-22
CN201710732235.3 2017-08-22
CN201711083552.3 2017-11-07
CN201711083552.3A CN109425427A (zh) 2017-08-22 2017-11-07 光传感器及终端设备

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US16/797,383 Continuation US10782185B2 (en) 2017-08-22 2020-02-21 Light sensor and terminal device

Publications (1)

Publication Number Publication Date
WO2019037723A1 true WO2019037723A1 (fr) 2019-02-28

Family

ID=65438367

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/101582 WO2019037723A1 (fr) 2017-08-22 2018-08-21 Photocapteur et dispositif terminal

Country Status (1)

Country Link
WO (1) WO2019037723A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112133723A (zh) * 2019-06-24 2020-12-25 南昌欧菲生物识别技术有限公司 感光模组、显示装置及电子设备
CN112484850A (zh) * 2019-09-11 2021-03-12 北京小米移动软件有限公司 光强检测模块、屏幕部件和移动终端
CN113899448A (zh) * 2020-06-22 2022-01-07 北京小米移动软件有限公司 电子设备、环境光色温的测量方法及装置、存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080006762A1 (en) * 2005-09-30 2008-01-10 Fadell Anthony M Integrated proximity sensor and light sensor
CN101951445A (zh) * 2010-10-09 2011-01-19 华为终端有限公司 自适应调节的终端设备和方法
CN204155595U (zh) * 2013-11-07 2015-02-11 苹果公司 电子设备和检测落在电子设备上的环境光的装置
CN106462339A (zh) * 2015-09-28 2017-02-22 华为技术有限公司 终端及检测环境光亮度的方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080006762A1 (en) * 2005-09-30 2008-01-10 Fadell Anthony M Integrated proximity sensor and light sensor
CN101951445A (zh) * 2010-10-09 2011-01-19 华为终端有限公司 自适应调节的终端设备和方法
CN204155595U (zh) * 2013-11-07 2015-02-11 苹果公司 电子设备和检测落在电子设备上的环境光的装置
CN106462339A (zh) * 2015-09-28 2017-02-22 华为技术有限公司 终端及检测环境光亮度的方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3671146A4

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112133723A (zh) * 2019-06-24 2020-12-25 南昌欧菲生物识别技术有限公司 感光模组、显示装置及电子设备
CN112484850A (zh) * 2019-09-11 2021-03-12 北京小米移动软件有限公司 光强检测模块、屏幕部件和移动终端
CN112484850B (zh) * 2019-09-11 2024-03-26 北京小米移动软件有限公司 光强检测模块、屏幕部件和移动终端
CN113899448A (zh) * 2020-06-22 2022-01-07 北京小米移动软件有限公司 电子设备、环境光色温的测量方法及装置、存储介质
CN113899448B (zh) * 2020-06-22 2024-03-01 北京小米移动软件有限公司 电子设备、环境光色温的测量方法及装置、存储介质

Similar Documents

Publication Publication Date Title
US10782185B2 (en) Light sensor and terminal device
KR102164173B1 (ko) 이동 단말기
CN111366242B (zh) 环境光检测装置及终端设备
CN111052140B (zh) 指纹识别装置和电子设备
US9612152B2 (en) Ambient light sensor with internal light cancellation
WO2019037723A1 (fr) Photocapteur et dispositif terminal
JP7124125B2 (ja) 保護フィルム並びに、保護フィルムを切断するための方法及び装置
WO2019080778A1 (fr) Composant de détection optique et dispositif terminal
CN112161703A (zh) 环境光感测装置和电子设备
CN112964359A (zh) 一种环境光传感器及电子设备
WO2020258533A1 (fr) Module photosensible, appareil d'affichage et dispositif électronique
CN111968602A (zh) 显示装置、电子设备及电子设备的控制方法
CN111968603B (zh) 显示装置、电子设备及电子设备的控制方法
US20220268632A1 (en) Reconfigurable polarization imaging system
CN111868563B (zh) 显示器下部的传感器
CN110770747B (zh) 指纹识别装置和电子设备
CN211180838U (zh) 指纹识别装置和电子设备
US11867538B2 (en) Lower display sensor
EP3805715B1 (fr) Terminal mobile
CN111964778A (zh) 屏下环境光传感器和终端设备
CN109425946B (zh) 光学模块及电子设备
US10746628B2 (en) Method of measuring optical parameters of polarizer and measuring device
CN111998940B (zh) 显示屏组件、电子设备及环境光强度检测方法
CN105319766B (zh) 偏光装置及显示器
CN217718919U (zh) 一种光学传感器模组和终端设备

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18847658

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20207008088

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2018847658

Country of ref document: EP

Effective date: 20200319