WO2019233332A1 - 光学指纹识别组件及终端 - Google Patents

光学指纹识别组件及终端 Download PDF

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Publication number
WO2019233332A1
WO2019233332A1 PCT/CN2019/089160 CN2019089160W WO2019233332A1 WO 2019233332 A1 WO2019233332 A1 WO 2019233332A1 CN 2019089160 W CN2019089160 W CN 2019089160W WO 2019233332 A1 WO2019233332 A1 WO 2019233332A1
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Prior art keywords
light
band
pass filter
image sensor
optical fingerprint
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PCT/CN2019/089160
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English (en)
French (fr)
Inventor
叶金山
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维沃移动通信有限公司
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Application filed by 维沃移动通信有限公司 filed Critical 维沃移动通信有限公司
Priority to KR1020207036004A priority Critical patent/KR20210010533A/ko
Priority to EP19816101.0A priority patent/EP3805983A4/en
Priority to JP2020568259A priority patent/JP2021525432A/ja
Publication of WO2019233332A1 publication Critical patent/WO2019233332A1/zh
Priority to US16/953,226 priority patent/US11430251B2/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the present disclosure relates to the field of communication technologies, and in particular, to an optical fingerprint identification component and a terminal.
  • An image sensor is set under the terminal display screen. After the light emitted by the display screen is reflected by the fingers above the display screen, it passes through the optical lens and filter and returns to the image sensor. It reflects the energy of the light source by sensing the fingerprint ridges and fingerprint valleys. The difference, thus forming different grayscale images, that is, forming the original fingerprint image.
  • the light received by the image sensor includes blue light and green light
  • there is a large difference in the intensity distribution of blue light and green light which makes it difficult to effectively adjust the exposure time, easily causes blurred fingerprint images, and has a low fingerprint recognition rate.
  • the embodiments of the present disclosure provide an optical fingerprint recognition component and a terminal to solve the problem of low fingerprint recognition rate of the terminal.
  • an embodiment of the present disclosure provides an optical fingerprint recognition component, including: a lens, an image sensor, and a band-pass filter, the band-pass filter is disposed on a side where the image sensor receives light.
  • an embodiment of the present disclosure further provides a terminal, which includes a display screen and an optical fingerprint identification component disposed below the display screen, and the display screen is provided with a light-transmitting area for the optical fingerprint identification component;
  • the optical fingerprint identification component includes a lens, an image sensor, and a band-pass filter, and the band-pass filter is disposed between the display screen and the image sensor.
  • An optical fingerprint recognition component includes a lens, an image sensor, and a band-pass filter, and the band-pass filter is disposed on a side where the image sensor receives light.
  • the band-pass filter allows only monochromatic light, the image sensor will not be interfered by light other than monochromatic light.
  • the exposure time can be adjusted for monochromatic light to make the fingerprint image clearer and improve the fingerprint. Recognition rate.
  • FIG. 1 is a schematic structural diagram of an optical fingerprint identification component according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a terminal provided by an embodiment of the present disclosure.
  • FIG. 1 is a schematic structural diagram of an optical fingerprint identification component according to an embodiment of the present disclosure.
  • the lens includes a lens 101, an image sensor 102, and a bandpass filter 103.
  • 103 is disposed on a side of the image sensor 102 that receives light.
  • the lens 101 can make the incident light better received by the image sensor 102.
  • the above-mentioned band-pass filter 103 is a filter that can pass only monochromatic light, for example, it can pass only blue light or green light only.
  • the above-mentioned band-pass filter 103 is disposed on the side where the image sensor 102 receives light, which can be understood as such that the band-pass filter 103 is disposed on the side where the sensing surface of the image sensor 102 is located, of course, the band-pass filter 103 A certain distance can be maintained from the sensing surface of the image sensor 102.
  • the above-mentioned band-pass filter 103 is disposed on the side where the image sensor 102 receives light.
  • the band-pass filter 103 may be located between the lens 101 and the image sensor 102, or the lens 101 may be located between the band-pass filter 103 and the image sensor 102, this embodiment of the present disclosure is not limited.
  • the remaining light after the filter is filtered is blue light and green light, or mixed light of blue light and green light.
  • the visible light band of the light response curve of the image sensor 102 is relatively wide.
  • inductive imaging due to the large difference in the intensity distribution of blue light and green light, it is difficult to effectively adjust the exposure time. If you choose a certain exposure time, the blue pixel area is overexposed and the signal strength of the green pixel area is not enough. As a result, the imaging of the fingerprint image is uneven, the fingerprint image is blurred, and the fingerprint recognition rate is reduced.
  • the band-pass filter 103 since a band-pass filter 103 exists on the side where the image sensor 102 receives light, the band-pass filter 103 allows only monochromatic light, so the image sensor 102 does not receive monochromatic light.
  • the interference of other light can adjust the exposure time for monochrome light to make the fingerprint image clearer and improve the recognition rate of the fingerprint.
  • the light source emitted by the display screen can be any combination of light sources, which can meet users' requirements for diverse color design, that is, the mixed light can be displayed in the fingerprint recognition area of the screen according to the design requirements. In this way, the personalized needs of different users can be met, and the display mode of the display screen of the mobile terminal can be more diversified.
  • the terminal may be a mobile phone, a tablet computer, a laptop computer, a personal digital assistant (PDA), a mobile Internet device (Mobile Internet Device, MID), or Wearable devices (Wearable devices) and so on.
  • PDA personal digital assistant
  • MID mobile Internet Device
  • Wearable devices Wearable devices
  • the band-pass filter 103 is disposed between the lens 101 and the image sensor 102.
  • the above-mentioned band-pass filter 103 is disposed between the lens 101 and the image sensor 102, and can filter the light passing through the lens 101.
  • the lens 101 can be a convex lens, so that light can be concentrated. In this way, the area of the band-pass filter 103 can be made relatively small, it only needs to be able to receive the concentrated light and perform filtering, so that the material cost of the band-pass filter 103 can be saved.
  • the band-pass filter 103 is disposed on the image sensor 102 and is attached to the image sensor 102.
  • the above-mentioned band-pass filter 103 is disposed on the image sensor 102 and is bonded to the image sensor 102, so that the band-pass filter 103 can be directly supported and fixed by the image sensor 102.
  • the band-pass filter 103 can be bonded to the image sensor 102 through a dispensing position, or can be connected to the image sensor 102 through a buckle, etc., which is not limited in this embodiment.
  • the light that can pass through the band-pass filter 103 is monochromatic light.
  • the light that the band-pass filter 103 can pass through is monochromatic light, so that the image sensor 102 will not be interfered by light other than the monochromatic light.
  • the exposure time can be adjusted for the monochromatic light to make the fingerprint The image is clearer and improves the recognition rate of the fingerprint.
  • the monochromatic light is blue light or green light.
  • the wavelength range of the light that the band-pass filter 103 can pass is 455-492 nanometers, that is, it can pass blue light.
  • the display screen emits mixed light, since the reflected visible light is filtered by the bandpass filter 103 and only blue light is allowed to pass, it can avoid the exposure time of multispectral light due to the difference in light leakage intensity, which is difficult to coordinate and cause fingerprint image blur. Problems, which can improve the recognition rate of fingerprints.
  • the wavelength range of the light that can pass through the band-pass filter 103 may be 455 to 492 nanometers, that is, green light may be passed.
  • the display screen emits mixed light, since the reflected visible light is filtered by the bandpass filter 103 and only green light is allowed to pass, it is possible to avoid the exposure time of multispectral light due to the difference in light leakage intensity, which is difficult to coordinate and cause fingerprint images.
  • the problem of blurring can improve the recognition rate of fingerprints.
  • the wavelength range of light that the band-pass filter 103 can pass is a wavelength range determined by adding a preset margin to the wavelength range of the monochromatic light.
  • the preset margin may be a reasonable margin determined based on multiple experiments, and monochromatic light of different colors may correspond to different or the same margin. Considering the non-abrupt effect of the cut-off frequency of the monochromatic light (which can be blue or green), a certain margin can be left.
  • the wavelength range of the blue light is 455 to 492 nanometers
  • the wavelength range of the light that the band-pass filter 103 can pass is 455 to 492 nanometers.
  • a preset margin is added to make the wavelength range of the light that the band-pass filter 103 can pass is 430-510 nm.
  • the wavelength range of the green light is 492 to 577 nanometers
  • the wavelength range of the light that the band-pass filter 103 can pass is 492 to A preset margin is added to 577 nanometers, so that the wavelength range of light that the band-pass filter 103 can pass is 470-590 nanometers.
  • An optical fingerprint recognition component includes a lens 101, an image sensor 102, and a band-pass filter 103.
  • the band-pass filter 103 is disposed on a side where the image sensor 102 receives light. In this way, since the band-pass filter 103 allows only monochromatic light, the image sensor 102 will not be interfered by light other than monochromatic light.
  • the exposure time can be adjusted for monochromatic light to make the fingerprint image clearer and higher. Fingerprint recognition rate.
  • FIG. 2 is a schematic structural diagram of a terminal provided by an embodiment of the present disclosure. As shown in FIG. 2, it includes a display screen 201 and an optical fingerprint recognition component 202 disposed below the display screen 201, and the display screen 201 is provided with a light-transmitting area 2011 for the optical fingerprint recognition component;
  • the optical fingerprint identification component 202 includes a lens 2021, an image sensor 2022, and a band-pass filter 2023.
  • the band-pass filter 2023 is disposed between the display screen 201 and the image sensor 2022.
  • the display screen 201 described above may be a liquid crystal display screen, or may be an organic light-emitting diode (OLED) display screen.
  • the above-mentioned light-transmitting region 2011 may be a circular region, or may be a rectangular region, and the like, of course, it may also be some other shapes of regions, which is not limited in the embodiment of the present disclosure.
  • the image sensor 2022 due to the existence of the light-transmitting area 2011, light can reach the image sensor 2022 through the light-transmitting area 2011.
  • the above-mentioned band-pass filter 2023 is disposed between the display screen 201 and the image sensor 2022, so that the image sensor 2022 is not interfered by light rays other than the monochromatic light, and the exposure time can be adjusted for the monochromatic light. Make the fingerprint image clearer and improve the recognition rate of the fingerprint.
  • the display 201 is an OLED display.
  • the display screen 201 is an OLED display screen, and the presence of the band-pass filter 2023 can improve the fingerprint recognition rate of the OLED display screen.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Optical Filters (AREA)

Abstract

本公开提供一种光学指纹识别组件及终端，该光学指纹识别组件包括：透镜、图像传感器和带通滤光片，所述带通滤光片设置于所述图像传感器接收光线的一侧。

Description

光学指纹识别组件及终端
相关申请的交叉引用
本申请主张在2018年6月8日在中国提交的中国专利申请No.201810588494.8的优先权，其全部内容通过引用包含于此。
技术领域
本公开涉及通信技术领域，尤其涉及一种光学指纹识别组件及终端。
背景技术
随着终端技术的迅速发展，终端已经成为人们生活中必不可少的一种工具，并且为用户生活的各个方面带来了极大的便捷。相关技术中已经存在屏下指纹识别技术，可以便于用户操作，并且为用户带来新的体验。
终端显示屏的下方设置有图像传感器，当显示屏发出的光经过显示屏上方的手指反射以后，经过光学透镜与滤光片，返回到图像传感器上，其通过感应指纹脊和指纹谷反射光源能量的差异，从而形成不同灰度的图像，即形成指纹原始图像。
但是，由于图像传感器接收到的光包括蓝光与绿光，蓝光与绿光的强度分布存在较大差异性，导致曝光时间难以有效调节，容易造成指纹图像模糊，指纹识别率较低。
发明内容
本公开实施例提供一种光学指纹识别组件及终端，以解决终端指纹识别率较低的问题。
为了解决上述技术问题，本公开是这样实现的：
第一方面，本公开实施例提供了一种光学指纹识别组件，包括：透镜、图像传感器和带通滤光片，所述带通滤光片设置于所述图像传感器接收光线的一侧。
第二方面，本公开实施例还提供一种终端，包括显示屏和设置于所述显 示屏下方的光学指纹识别组件，所述显示屏设置有供所述光学指纹识别组件的透光区域；
所述光学指纹识别组件包括透镜、图像传感器和带通滤光片，所述带通滤光片设置于所述显示屏与所述图像传感器之间。
本公开实施例的一种光学指纹识别组件，包括：透镜、图像传感器和带通滤光片，所述带通滤光片设置于所述图像传感器接收光线的一侧。这样，由于带通滤光片只允许通过单色光，从而图像传感器不会受到单色光之外的其他光线的干扰，可以针对单色光调节曝光时间，使指纹图像比较清晰，提高指纹的识别率。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对本公开实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本公开实施例提供的光学指纹识别组件的结构示意图；
图2是本公开实施例提供的终端的结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
参见图1，图1是本公开实施例提供的光学指纹识别组件的结构示意图，如图1所示，包括：透镜101、图像传感器102和带通滤光片103，所述带通滤光片103设置于所述图像传感器102接收光线的一侧。
本实施例中，上述透镜101可以使射入的光线更好的被图像传感器102所接收。上述带通滤光片103为只能够通过单色光的滤光片，例如只能够通过蓝光或者只能够通过绿光等等。上述带通滤光片103设置于所述图像传感 器102接收光线的一侧可以这样理解为带通滤光片103设置于所述图像传感器102感应面所在的一侧，当然带通滤光片103可以与图像传感器102感应面保持一定的距离。当光线射入时，首先会经过带通滤光片103进行滤光，滤光之后的光线再被图像传感器102接收。
需要说明的是，上述带通滤光片103设置于所述图像传感器102接收光线的一侧，可以是带通滤光片103位于透镜101和图像传感器102之间，或者也可以是透镜101位于带通滤光片103和图像传感器102之间，对此本公开实施例不作限定。
相关技术中，滤光片滤光之后剩下的光为蓝光与绿光，或者蓝光与绿光的混合色光。一般来说，图像传感器102光响应曲线可见光波段比较宽，当感应成像的时候，由于蓝光与绿光的强度分布较大差异性，导致曝光时间难以有效调节。如选择某一个曝光时间，经常会出现蓝色像素区域过曝，绿色像素区域信号强度不够的情况，从而最终造成指纹图像成像不均匀，指纹图像模糊，导致指纹识别率下降。
而本实施例的光学指纹识别组件，由于图像传感器102接收光线的一侧存在带通滤光片103，带通滤光片103只允许通过单色光，从而图像传感器102不会受到单色光之外的其他光线的干扰，可以针对单色光调节曝光时间，使指纹图像比较清晰，提高指纹的识别率。
其次，由于带通滤光片103的存在，显示屏发射的光源可以是任意光源搭配，从而可以满足用户对于多样化色彩设计需求，即在屏幕的指纹识别区域可以根据设计需求显示混合光。这样，可以满足不同的用户的个性化需求，使移动终端显示屏的显示方式更加多样化。
本实施例中，上述终端可以是手机、平板电脑(Tablet Personal Computer)、膝上型电脑(Laptop Computer)、个人数字助理(personal digital assistant，PDA)、移动上网装置(Mobile Internet Device，MID)或可穿戴式设备(Wearable Device)等等。
可选地，所述带通滤光片103设置于所述透镜101和所述图像传感器102之间。
本实施方式中，将上述带通滤光片103设置于所述透镜101和所述图像 传感器102之间，可以对经过透镜101的光线进行滤光。并且，透镜101可以为一个凸透镜，从而可以将光线集中起来。这样带通滤光片103的面积可以做的相对较小，只需要能够接收集中之后的光线并进行滤光就行，从而可以节省带通滤光片103的材料成本。
可选地，所述带通滤光片103设置于所述图像传感器102上，并与所述图像传感器102贴合。
本实施方式中，上述带通滤光片103设置于所述图像传感器102上，并与所述图像传感器102贴合，从而可以直接用图像传感器102支撑固定带通滤光片103。当然，带通滤光片103可以通过点胶位与图像传感器102粘接，或者通过一个卡扣与图像传感器102卡接等等，对此本实施方式不作限定。
可选地，所述带通滤光片103可通过的光为单色光。
本实施方式中，上述带通滤光片103可通过的光为单色光，从而图像传感器102不会受到单色光之外的其他光线的干扰，可以针对单色光调节曝光时间，使指纹图像比较清晰，提高指纹的识别率。
可选地，所述单色光为蓝光或者为绿光。
本实施方式中，上述带通滤光片103可通过的光的波长范围可以为455～492纳米，即可以通过蓝光。当显示屏发射混合光以后，由于反射回来的可见光经过带通滤光片103滤光之后，只允许蓝光通过，所以可以避免多谱光由于漏光强度的差异引起的曝光时间难以协调造成指纹图像模糊的问题，从而可以提高指纹的识别率。
或者，上述带通滤光片103可通过的光的波长范围可以为455～492纳米，即可以通过绿光。当显示屏发射混合光以后，由于反射回来的可见光经过带通滤光片103滤光之后，只允许绿光通过，所以可以避免多谱光由于漏光强度的差异引起的曝光时间难以协调造成指纹图像模糊的问题，从而可以提高指纹的识别率。
可选地，所述带通滤光片103可通过的光的波长范围，为所述单色光的波长范围加上预设余量确定的波长范围。
本实施方式中，上述预设余量可以根据多次实验确定的一个合理的余量，并且不同颜色的单色光可以对应不同或者相同的余量。考虑到单色光(可以 是蓝光或者绿光)波长截止频率的效应非陡然性，从而可以留有一定余量。
例如，当带通滤光片103可通过的光的为蓝光时，由于蓝光的波长范围为455～492纳米，那么带通滤光片103可通过的光的波长范围就可以在455～492纳米上加上预设余量，使带通滤光片103可通过的光的波长范围为430～510纳米。或者，当带通滤光片103可通过的光的为绿光时，由于绿光的波长范围为492～577纳米，那么带通滤光片103可通过的光的波长范围就可以在492～577纳米上加上预设余量，使带通滤光片103可通过的光的波长范围为470～590纳米。
本公开实施例的一种光学指纹识别组件，包括：透镜101、图像传感器102和带通滤光片103，所述带通滤光片103设置于所述图像传感器102接收光线的一侧。这样，由于带通滤光片103只允许通过单色光，从而图像传感器102不会受到单色光之外的其他光线的干扰，可以针对单色光调节曝光时间，使指纹图像比较清晰，提高指纹的识别率。
参见图2，图2是本公开实施例提供的终端的结构示意图。如图2所示，包括显示屏201和设置于所述显示屏201下方的光学指纹识别组件202，所述显示屏201设置有供所述光学指纹识别组件的透光区域2011；
所述光学指纹识别组件202包括透镜2021、图像传感器2022和带通滤光片2023，所述带通滤光片2023设置于所述显示屏201与所述图像传感器2022之间。
本实施例中，上述显示屏201可以是液晶显示屏，或者也可以是有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏。上述透光区域2011可以是一个圆形的区域，或者也可以是一个矩形的区域等等，当然除此之外还可以是一些其他形状的区域，对此本公开实施例不作限定。
本实施例中，由于透光区域2011的存在，光线可以通过透光区域2011到达图像传感器2022。上述带通滤光片2023设置于所述显示屏201与所述图像传感器2022之间，从而图像传感器2022不会受到单色光之外的其他光线的干扰，可以针对单色光调节曝光时间，使指纹图像比较清晰，提高指纹的识别率。
可选地，所述显示屏201为OLED显示屏。
本实施方式中，上述显示屏201为OLED显示屏，由于带通滤光片2023的存在，可以提高OLED显示屏的指纹识别率。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
上面结合附图对本公开的实施例进行了描述，但是本公开并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本公开的启示下，在不脱离本公开宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本公开的保护之内。

Claims (8)

  1. 一种光学指纹识别组件，包括：透镜、图像传感器和带通滤光片，所述带通滤光片设置于所述图像传感器接收光线的一侧。
  2. 根据权利要求1所述的光学指纹识别组件，其中，所述带通滤光片设置于所述透镜和所述图像传感器之间。
  3. 根据权利要求2所述的光学指纹识别组件，其中，所述带通滤光片设置于所述图像传感器上，并与所述图像传感器贴合。
  4. 根据权利要求1所述的光学指纹识别组件，其中，所述带通滤光片可通过的光的为单色光。
  5. 根据权利要求4所述的光学指纹识别组件，其中，所述单色光为蓝光或者为绿光。
  6. 根据权利要求4所述的光学指纹识别组件，其中，所述带通滤光片可通过的光的波长范围，为所述单色光的波长范围加上预设余量确定的波长范围。
  7. 一种终端，包括显示屏和设置于所述显示屏下方的光学指纹识别组件，所述显示屏设置有供所述光学指纹识别组件的透光区域；
    所述光学指纹识别组件包括透镜、图像传感器和带通滤光片，所述带通滤光片设置于所述显示屏与所述图像传感器之间。
  8. 根据权利要求7所述的终端，其中，所述显示屏为有机发光二极管OLED显示屏。
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