WO2021143036A1 - 指纹感测模块 - Google Patents

指纹感测模块 Download PDF

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Publication number
WO2021143036A1
WO2021143036A1 PCT/CN2020/095297 CN2020095297W WO2021143036A1 WO 2021143036 A1 WO2021143036 A1 WO 2021143036A1 CN 2020095297 W CN2020095297 W CN 2020095297W WO 2021143036 A1 WO2021143036 A1 WO 2021143036A1
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light
image sensor
sensing module
fingerprint sensing
shielding layer
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PCT/CN2020/095297
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English (en)
French (fr)
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范成至
周正三
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神盾股份有限公司
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Publication of WO2021143036A1 publication Critical patent/WO2021143036A1/zh

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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

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  • the invention relates to a sensing module, in particular to a fingerprint sensing module.
  • the under-screen fingerprint sensor module can be mainly divided into ultrasonic type and optical type.
  • the optical type has lower cost and is more suitable for mass production.
  • the collimator arranged under the display panel transmits the reflected light of the finger pressed on the display panel to the image sensor arranged under the collimator, however, it also reflects The light is transmitted to the light sensing area and the circuit area on the image sensor.
  • noise will be generated, which in turn reduces the signal-to-noise ratio of the image sensor, resulting in image
  • the quality of the fingerprint image sensed by the sensor is degraded.
  • the present invention is directed to a fingerprint sensing module, which has a good signal-to-noise ratio.
  • An embodiment of the present invention provides a fingerprint sensing module including an image sensor, a light shielding layer, and a collimator.
  • the image sensor includes a plurality of light sensing areas arranged in an array and a circuit area arranged around the light sensing areas.
  • the light-shielding layer is disposed on the circuit area and exposes these light sensing areas.
  • the collimator is disposed on the image sensor and the light shielding layer, wherein the collimator guides light from the outside to the image sensor, and the light shielding layer blocks the light from being transmitted to the circuit area.
  • the fingerprint sensing module of the embodiment of the present invention since the light-shielding layer is disposed on the circuit area, the light-shielding layer can block light from the outside to prevent light from being transmitted to the circuit area and causing noise interference. In this way, the fingerprint sensing module of the embodiment of the present invention can have a higher signal-to-noise ratio and better image quality.
  • FIG. 1 is a schematic cross-sectional view of an electronic device according to an embodiment of the invention.
  • FIG. 2 is a schematic cross-sectional view of a fingerprint sensing module according to another embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view of a fingerprint sensing module according to another embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view of an electronic device according to an embodiment of the invention.
  • the electronic device 40 of this embodiment includes a display panel 50 and a fingerprint sensing module 100.
  • the electronic device 40 is, for example, a smart phone, a tablet computer, a notebook computer, a personal digital assistant (PDA) or other appropriate electronic devices.
  • the display panel 50 is, for example, an organic light emitting diode display panel, a liquid crystal display panel, or other suitable display panels.
  • the fingerprint sensor module 100 includes an image sensor 200, a light shielding layer 110 and a collimator 300.
  • the image sensor 200 includes a plurality of light sensing regions 220 arranged in an array (for example, a two-dimensional array) and a circuit region 230 disposed around the light sensing regions 220. At least part of the circuit area 230 is located between the adjacent light sensing areas 220, and there may also be another part of the circuit area 230 around the whole of these light sensing areas 220.
  • the image sensor 200 is, for example, a thin film transistor image sensor (TFT sensor), and the image sensor 200 includes a substrate 210, such as a glass substrate, and the pixel electrode 222 of the light sensing area 220 The circuit 232 and the circuit area 230 are all disposed on the substrate 210.
  • the image sensor 200 is disposed under a partial area of the display panel 50.
  • the image sensor 200 is a thin film transistor image sensor, it can also cover the entire bottom of the display panel 50, or only below a partial area of the display panel 50.
  • the light shielding layer 110 is disposed on the circuit area 230 and exposes the light sensing areas 220.
  • the collimator 300 is disposed on the image sensor 200 and the light shielding layer 110.
  • the collimator 300 guides light 51 from the outside to the image sensor 200, and the light shielding layer 110 blocks the light 51 to prevent the light 51 from being transmitted to the circuit area 230.
  • the unblocked light 51 enters the light sensing area 220.
  • the display panel 50 emits light 53, and the light 53 is transmitted upward to the finger 60 pressing on the upper surface 52 of the display panel 50, and then is reflected by the finger 60 as light 51.
  • the light 51 reflected by the finger 60 carries the fingerprint information of the finger 60 and penetrates the display panel 50 downward.
  • the collimator 300 transmits the light 51 to the light sensing area 220 in a collimated manner, thereby forming a fingerprint image.
  • the display panel 50 emits light 53 to illuminate the finger 60.
  • other light sources different from the display panel 50 may emit light 53 to illuminate the finger 60.
  • the fingerprint sensing module 100 of this embodiment since the light shielding layer 110 is disposed on the circuit area 230, it can prevent the light 51 from being transmitted to the circuit area 230 and causing noise interference. In this way, the fingerprint sensor module 100 of this embodiment can have a higher signal-to-noise ratio and better image quality.
  • the light-shielding layer 110 is a light-absorbing layer or a light-reflecting layer, such as a black photoresist layer, a metal layer, or a film layer formed by other materials that can shield the light 51.
  • the fingerprint sensing module 100 further includes a light-transmitting protective layer 120 covering the light-shielding layer 110 and the light sensing regions 220.
  • the light-transmitting protective layer 120 is, for example, an optically transparent adhesive layer.
  • the collimator 300 has a plurality of light channels 310 separated from each other, and each light channel 310 is surrounded by a light-shielding body 320 and extends from the side of the collimator 300 away from the image sensor 200 toward the image.
  • the optical channel 310 is, for example, formed of a transparent cylindrical solid, which is, for example, an optical fiber
  • the collimator 300 is, for example, a fiber optical plate (FOP).
  • each optical channel 310 may also be a space, which may be filled with air, gas, or liquid, or a vacuum.
  • Part of the light 51 is transmitted to these light sensing regions 220 through a part of the light channel 310 to form a fingerprint image, and another part of the light 51 is transmitted to the light shielding layer 110 through another part of the light channel 310, and is blocked by the light shielding layer 110. Will not be transferred to the circuit area 230.
  • the image sensor 200a is, for example, a complementary metal oxide semiconductor image sensor (complementary metal oxide semiconductor image sensor, CMOS image sensor) made of a silicon substrate, and the substrate 210a is silicon Substrate.
  • CMOS image sensor complementary metal oxide semiconductor image sensor
  • the collimator 300b is a lens array, which has a plurality of microlenses 330 arranged in an array (for example, a two-dimensional array), and these microlenses 330 can make the light 51 carrying fingerprint information. It is transferred to these light sensing areas 220 to form a fingerprint image.
  • the fingerprint sensing module of the embodiment of the present invention since the light shielding layer is disposed on the circuit area, the light shielding layer can block light from the outside to prevent light from being transmitted to the circuit area and causing noise interference. In this way, the fingerprint sensing module of the embodiment of the present invention can have a higher signal-to-noise ratio and better image quality.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

一种指纹感测模块，包括一图像传感器(200)、一遮光层(110)及一准直器(300)。图像传感器(200)包括多个排成阵列的光感测区(220)及配置于这些光感测区(220)周围的电路区(230)。遮光层(110)配置于电路区(230)上，且暴露出这些光感测区(220)。准直器(300)配置于图像传感器(200)与遮光层(110)上，其中准直器(300)将来自外界的光(51)导引至图像传感器(200)，其中，遮光层(110)阻挡光传递至电路区(230)。

Description

指纹感测模块 技术领域
本发明涉及一种感测模块，尤其涉及一种指纹感测模块。
背景技术
随着可携式电子装置朝向大屏占比发展，传统配置于电子装置的正面的电容式指纹传感器便不在适用，这是因为电容式指纹传感器会占用电子装置正面过多的面积，而导致屏占比难以提升。在此趋势之下，屏下式指纹感测模块便被发展出来。
屏下式指纹感测模块主要可分为超音波式与光学式，其中又以光学式的成本较低，较适合量产。在现有的光学式指纹感测模块中，配置于显示面板下方的准直器将按压于显示面板上的手指的反射光传递至配置于准直器下方的图像传感器，然而，却同时将反射光传递至图像传感器上的光感测区与电路区，电路区被反射光照射到时会产生噪声(noise)，进而降低了图像传感器的信噪比(signal-to-noise ratio)，导致图像传感器所感测到的指纹图像的质量下降。
发明内容
本发明是针对一种指纹感测模块，具有良好的信噪比。
本发明的一实施例提出一种指纹感测模块，包括一图像传感器、一遮光层及一准直器。图像传感器包括多个排成阵列的光感测区及配置于这些光感测区周围的电路区。遮光层配置于电路区上，且暴露出这些光感测区。准直器配置于图像传感器与遮光层上，其中准直器将来自外界的光导引至图像传感器，其中，遮光层阻挡光传递至电路区。
在本发明的实施例的指纹感测模块中，由于采用遮光层配置于电路区上，因此遮光层可以阻挡来自外界的光，以避免光传递至电路区而造成噪声干扰。如此一来，本发明的实施例的指纹感测模块便可以具有较高的信噪比与较佳的图像质量。
附图说明
图1为本发明的一实施例的电子装置的剖面示意图；
图2为本发明的另一实施例的指纹感测模块的剖面示意图；
图3为本发明的又一实施例的指纹感测模块的剖面示意图。
附图标记说明
40:电子装置
50:显示面板
51、53:光
52:上表面
60:手指
100、100a、100b:指纹感测模块
110:遮光层
120:透光保护层
200、200a:图像传感器
210、210a:基板
220:光感测区
222:像素电极
230:电路区
232:电路
300、300b:准直器
310:光通道
320:遮光体
330:微透镜
具体实施方式
现将详细地参考本发明的示范性实施例，示范性实施例的实例说明于附图中。只要有可能，相同元件符号在附图和描述中用来表示相同或相似部分。
图1为本发明的一实施例的电子装置的剖面示意图。请参照图1，本实施例的电子装置40包括一显示面板50及一指纹感测模块100。电子装置40 例如是智能手机、平板计算机、笔记本电脑、个人数字助理(personal digital assistant,PDA)或其他适当的电子装置。显示面板50例如为有机发光二极管显示面板、液晶显示面板或其他适当的显示面板。
指纹感测模块100包括一图像传感器200、一遮光层110及一准直器300。图像传感器200包括多个排成阵列(例如是二维阵列)的光感测区220及配置于这些光感测区220周围的电路区230。至少部分的电路区230位于相邻的光感测区220之间，也可以有另一部分的电路区230在这些光感测区220的整体的周围。在本实施例中，图像传感器200例如为薄膜晶体管图像传感器(thin film transistor image sensor,TFT sensor)，而图像传感器200包括一基板210，例如为玻璃基板，而光感测区220的像素电极222与电路区230的电路232皆配置于基板210上。在本实施例中，图像传感器200上配置于显示面板50的部分区域下方。然而，当图像传感器200为薄膜晶体管图像传感器时，其也可以是布满整个显示面板50的下方，或只在显示面板50的局部区域下方。
遮光层110配置于电路区230上，且暴露出这些光感测区220。准直器300配置于图像传感器200与遮光层110上，其中准直器300将来自外界的光51导引至图像传感器200，遮光层110阻挡光51，避免光51传递至电路区230，而未被阻挡的光51则进入光感测区220。具体而言，显示面板50发出光53，而光53往上传递至按压于显示面板50的上表面52的手指60后，被手指60反射成光51。而被手指60反射的光51携带手指60的指纹信息而往下穿透显示面板50，准直器300将光51准直地传递至光感测区220，进而形成指纹的图像。在本实施例中，是以显示面板50发出光53来照明手指60，然而，在其他实施例中，也可以是通过其他不同于显示面板50的光源发出光53来照明手指60。
在本实施例的指纹感测模块100中，由于遮光层110系配置于电路区230上，可避免光51传递至电路区230而造成噪声干扰。如此一来，本实施例的指纹感测模块100便可以具有较高的信噪比与较佳的图像质量。
在本实施例中，遮光层110为吸光层或光反射层，例如为黑色光致抗蚀剂层、金属层或其他可遮挡光51的物质所形成的膜层。此外，指纹感测模块100还包括一透光保护层120，覆盖遮光层110与这些光感测区220。透光保 护层120例如是光学透明胶层。
在本实施例中，准直器300具有多个彼此分离的光通道310，每一光通道310被一遮光体320所围绕，且从准直器300的远离图像传感器200的一侧往靠近图像传感器200的一侧延伸。在本实施例中，光通道310例如是由透明柱状固体形成，其例如为光纤，而准直器300例如为光纤光学板(fiber optical plate,FOP)。然而，在其他实施例中，每一光通道310也可以是一空间，其中可以填充有空气、气体或液体，也可以是真空。部分的光51经由部分的光通道310传递至这些光感测区220而形成指纹图像，而另一部分的光51经由另一部分的光通道310传递至遮光层110，并受到遮光层110的阻挡而不会传递至电路区230。
图2为本发明的另一实施例的指纹感测模块的剖面示意图。本实施例的指纹感测模块100a类似于图1的指纹感测模块100，而两者的差异如下所述。在本实施例的指纹感测模块100a中，图像传感器200a例如是以硅基板制成的互补式金属氧化物半导体图像传感器(complementary metal oxide semiconductor image sensor,CMOS image sensor)，而其基板210a为硅基板。
图3为本发明的又一实施例的指纹感测模块的剖面示意图。本实施例的指纹感测模块100b类似于图1的指纹感测模块100，而两者的差异如下所述。在本实施例的指纹感测模块100b中，准直器300b为透镜阵列，其具有多个排成阵列(例如二维阵列)的微透镜330，这些微透镜330能使携带指纹信息的光51传递至这些光感测区220以形成指纹图像。
综上所述，在本发明的实施例的指纹感测模块中，由于采用遮光层配置于电路区上，因此遮光层可以阻挡来自外界的光，以避免光传递至电路区而造成噪声干扰。如此一来，本发明的实施例的指纹感测模块便可以具有较高的信噪比与较佳的图像质量。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (10)

  1. 一种指纹感测模块，其特征在于，包括：
    图像传感器，包括多个排成阵列的光感测区及配置于所述多个光感测区周围的电路区；
    遮光层，配置于所述电路区上，且暴露出所述多个光感测区；以及
    准直器，配置于所述图像传感器与所述遮光层上，其中所述准直器将来自外界的光导引至所述图像传感器，其中，所述遮光层阻挡所述光传递至所述电路区。
  2. 根据权利要求1所述的指纹感测模块，其特征在于，所述准直器具有多个彼此分离的光通道，每一光通道被遮光体所围绕，且从所述准直器的远离所述图像传感器的一侧往靠近所述图像传感器的一侧延伸。
  3. 根据权利要求1所述的指纹感测模块，其特征在于，所述准直器为透镜阵列。
  4. 根据权利要求1所述的指纹感测模块，其特征在于，还包括透光保护层，覆盖所述遮光层与所述多个光感测区。
  5. 根据权利要求1所述的指纹感测模块，其特征在于，所述遮光层为吸光层或光反射层。
  6. 根据权利要求1所述的指纹感测模块，其特征在于，所述遮光层为黑色光致抗蚀剂层或金属层。
  7. 根据权利要求1所述的指纹感测模块，其特征在于，所述图像传感器为薄膜晶体管图像传感器。
  8. 根据权利要求1所述的指纹感测模块，其特征在于，所述图像传感器为互补式金属氧化物半导体图像传感器。
  9. 根据权利要求1所述的指纹感测模块，其特征在于，所述图像传感器还包括基板，且所述多个光感测区中的像素电极与所述电路区中的电路皆配置于所述基板上。
  10. 根据权利要求9所述的指纹感测模块，其特征在于，所述基板为玻璃基板或硅基板。
PCT/CN2020/095297 2020-01-16 2020-06-10 指纹感测模块 WO2021143036A1 (zh)

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TW202238971A (zh) * 2021-03-18 2022-10-01 神盾股份有限公司 光感測模組

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