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WO2018209660A1 - 导光元件、光电传感模组及电子装置 - Google Patents

导光元件、光电传感模组及电子装置 Download PDF

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Publication number
WO2018209660A1
WO2018209660A1 PCT/CN2017/084980 CN2017084980W WO2018209660A1 WO 2018209660 A1 WO2018209660 A1 WO 2018209660A1 CN 2017084980 W CN2017084980 W CN 2017084980W WO 2018209660 A1 WO2018209660 A1 WO 2018209660A1
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WIPO (PCT)
Prior art keywords
light
light guiding
guiding portion
region
disposed
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PCT/CN2017/084980
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English (en)
French (fr)
Inventor
林峰
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Shenzhen Sunwave Technology Co Ltd
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Shenzhen Sunwave Technology Co Ltd
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Priority to PCT/CN2017/084980 priority Critical patent/WO2018209660A1/zh
Publication of WO2018209660A1 publication Critical patent/WO2018209660A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition

Definitions

  • the utility model relates to the field of biometric identification, in particular to a light guiding component, a photoelectric sensing module and an electronic device having the same.
  • photoelectric sensing modules such as fingerprint identification modules
  • the image acquisition accuracy of the photoelectric sensor module needs to be improved.
  • the embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art. Therefore, the embodiments of the present invention need to provide a light guiding component, a photoelectric sensing module, and an electronic device having the photoelectric sensing module.
  • a light guiding component includes a light guiding portion disposed on the photosensor member for removing light outside the predetermined area to transmit light in the predetermined region.
  • the photosensor device includes a light receiving unit, and the light guiding portion includes a first light guiding portion, and the first light guiding portion is disposed on the light receiving unit.
  • the photosensor device further includes a light transmitting unit
  • the light guiding portion further includes a second light guiding portion
  • the second light guiding portion is disposed on the light transmitting unit.
  • the light guiding portion includes a plurality of light-passing pipes, and the pipe walls of the plurality of light-passing pipes are fitted to each other to form the predetermined area.
  • the diameter of the light-passing conduit of the light guiding portion located on the light-receiving unit is smaller than the diameter of the light-passing conduit of the light guiding portion located on the light transmitting unit.
  • the light guiding portion includes a first region through which light passes and a second region that blocks light from passing therethrough, and the first regions are not in communication with each other to form the predetermined region.
  • the first region is a via or is formed of a light transmissive material.
  • the second region is formed from a filter material or a light absorbing material.
  • a cross-sectional area of the first region of the light guiding portion on the light receiving unit is smaller than a cross-sectional area of the first region of the light guiding portion located on the light transmitting unit.
  • the light guiding portion located on the light transmitting unit is disposed obliquely in a desired light transmission direction.
  • the second light guiding portion is disposed obliquely toward a side close to the first light guiding portion.
  • the second light guiding portion has an inclination angle of 35° to 65°.
  • the light guiding element further includes a first light shielding wall disposed between the first light guiding portion and the second light guiding portion.
  • the light guiding element further includes a second light shielding wall disposed outside the second light guiding portion.
  • the light on the light receiving unit enters a predetermined area, and the light having an incident angle greater than a predetermined angle is totally reflected in the predetermined area.
  • the cross-sectional shape of the light-passing conduit is circular, elliptical, triangular, polygonal, or irregular.
  • the light pipe of the light guiding portion located on the light receiving unit has a diameter of less than 25 um.
  • the light guiding element is used in an optical image sensing module.
  • An optoelectronic sensing module includes a photosensor device, and a light guiding element of any of the above embodiments disposed on the photosensor device.
  • An electronic device includes the photoelectric sensor module of any of the above embodiments.
  • the photoelectric sensing module has the following points when performing biometric recognition:
  • the light guiding element is used to block the passage of adjacent light, so that the optical signal received by the light sensing unit under the light guiding element avoids interference of adjacent light, thereby improving the interference.
  • the accuracy and clarity of light collection increases the accuracy of biometrics.
  • the light guiding component can be separately prepared and then disposed in the photoelectric sensing module, thereby greatly accelerating the preparation process of the photoelectric sensing module.
  • the light guiding element can not only control the light propagation on the light receiving unit, but also avoid mutual interference between adjacent light rays, and can also control the light propagation on the light transmitting unit, so that the light emitted by the light source follows a preset propagation direction. Both are spread toward the protective cover, thus increasing the intensity of the light signal reaching the protective cover, thereby increasing the clarity of light collection, thereby improving the accuracy of biometric recognition.
  • FIG. 1 is a schematic diagram of an optical path of a fingerprint fingerprint recognition module of the present invention for fingerprint recognition
  • FIG. 2 is a schematic cross-sectional structural view of an embodiment of a light guiding device according to an embodiment of the present invention
  • FIG. 3 is a top plan view showing another embodiment of a light guiding device according to an embodiment of the present invention.
  • FIG. 4a is a schematic top plan view of still another embodiment of a light guiding device according to an embodiment of the present invention.
  • FIG. 4b is a schematic top plan view of still another embodiment of a light guiding device according to an embodiment of the present invention.
  • FIG. 5 is a schematic view of an optical path when light rays pass through the light guiding element according to an embodiment of the present invention
  • FIG. 6 is a schematic structural view of an embodiment of a photoelectric sensing module according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an optical path in a photoelectric sensing module according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural view of another embodiment of a photoelectric sensing module according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural view of still another embodiment of a photoelectric sensing module according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural view of still another embodiment of the photoelectric sensor module of the present invention.
  • FIG. 11 is a schematic plan view of an electronic device according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. .
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.
  • connection is to be understood broadly, and may be, for example, a fixed connection or a Disassembling the connection, or connecting integrally; may be mechanical connection, electrical connection or communication with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or mutual interaction of two elements Role relationship.
  • installation is to be understood broadly, and may be, for example, a fixed connection or a Disassembling the connection, or connecting integrally; may be mechanical connection, electrical connection or communication with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or mutual interaction of two elements Role relationship.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the photoelectric sensor module includes a bottom plate 101, a light source 102 disposed on the bottom plate 101, and a light sensing unit 103. And a protective cover 104.
  • the light sensing unit 103 is located inside the light source 102 and includes an array structure formed by a plurality of light sensing devices.
  • the reflected light will be received by the light sensing unit 103, and the received light signal will be converted into a corresponding electrical signal by the light sensing unit 103 and transmitted to the signal processing circuit. Since the reflected signals of the valleys and ridges of the fingerprint are greatly different, that is, the electrical signals output by the light-sensing device that receives the reflected signals of the valleys of the fingerprints are strong, and the electrical signals output by the light-sensing devices that receive the reflected signals of the ridges of the fingerprints are received. It is weak, so the signal processing circuit determines the position of the ridges and valleys of the fingerprint according to the strength of the electrical signal output by each of the light sensing devices in the light sensing unit 103, thereby forming a fingerprint image.
  • the spacing between the valleys and the ridges of the fingerprint is also very small, and the portion of the ridges of the light passing through the fingerprints is diffusely reflected, the adjacent reflected signals interfere with each other, and the light sensing devices in the light sensing unit 103 actually receive the light.
  • the reflected signal cannot reflect the true reflected signal, resulting in low definition and accuracy of the fingerprint image collected by the optical fingerprint sensor.
  • the present invention provides a light guiding element, which can be applied to a photoelectric sensing module, in particular an optical image recognition module, which will sense image information of a target object. And identifying the identity of the target object based on the sensed image information.
  • the image information may include fingerprint information, palm print information, ear pattern information, and skin texture information at other positions of the human body.
  • the light guiding element is applied to other optical recognition technologies to solve the problem of image acquisition using light.
  • the light guiding element is mainly disposed on the photosensor member to control the transmission of light emitted or received by the photosensor device, for example, removing light outside the predetermined area, so that the light is transmitted in a predetermined area. This allows adjacent light to not interfere with each other, improving the accuracy and clarity of light collection.
  • a light guiding component 200 includes a light guiding portion 210 disposed on a photosensor device.
  • Each light guiding portion 210 includes a plurality of first regions 211 through which light can pass and a plurality of second regions 212 that block light from passing therethrough.
  • the area 212 will be blocked by the second area 212, so that the light passing through the second area 212 does not pass or is very weak, and does not substantially affect the light sensing of the light sensing unit 303, so that adjacent light does not interfere with each other. Improve the accuracy and clarity of light collection.
  • the light guiding portion 210 may be integrated. As shown in FIG. 3, the second regions 212 are integrally connected with each other, and define a plurality of first regions 211. Not connected. Thus, the preparation process of the light guiding portion 210 is made simpler, and the structural strength of the light guiding portion 210 is increased. Furthermore, the light guiding portion 210 of the unitary structure is also conveniently disposed on the photosensor member.
  • the light guiding portion 210 in this embodiment may include a plurality of light-passing pipes 213 , and the light-passing pipes 213 are formed by bonding, bundling, or the like.
  • the light-passing pipe 213 includes a light path formed by the pipe wall 2131 and the pipe wall 2131, that is, the light-passing hole 2132.
  • the tube walls 2131 of the respective light-passing tubes 213 collectively form a second region 212, and the light-passing holes 2132 of the respective light-passing tubes 213 collectively form a first region 211.
  • the cross-sectional shape of the light-passing hole 2132 may be a circle, an ellipse, a triangle, a polygon, or the like. Since the light guiding portions 210 are formed to be bonded to each other, the gap between the triangular or polygonal light-passing tubes 213 can be achieved, thereby avoiding light from passing between the light-passing tubes 213. The gap passes through. Of course, if the aperture of the light-passing tube 213 is sufficiently small, substantially no gaps can be achieved between the other shapes of the light-passing tubes 213. Alternatively, the gap between the respective light-passing lines 213 may also be filled with a filling material to form a portion of the second region 212.
  • the aperture of the above-mentioned light-passing hole 2132 is as small as possible, for example, less than 25 um; and, the wall of the above-mentioned light-passing pipe 213 is as thin as possible, for example, 1-2 um.
  • the light-passing pipe 213 can be separately prepared and then fixed by bonding, bundling, or the like to form the light guiding portion 210, so that the preparation process of the light guiding portion 210 can be accelerated.
  • the light-passing duct 213 can also be realized by an existing structure such as an optical fiber. This simplifies the preparation process and reduces the manufacturing cost.
  • the transmission of light in the first region 211 adopts the principle of total reflection of light.
  • the vertically entering light L1 will follow the through hole.
  • 2132 is perpendicularly emitted from the other end of the through hole 2132.
  • the angle ⁇ between the light ray L2 and the normal line M1 perpendicular to the inner tube wall of the through hole 2132 is larger than the critical angle of the through hole 2132, the light occurs in the through hole 2132.
  • Total reflection after multiple total reflections, is emitted from the other end of the through hole 2132.
  • the energy in the light guiding portion 210 Due to the transmission of light in the light guiding portion 210, if total reflection occurs, the energy is not Will lose, otherwise the energy will be damaged.
  • the incident angle of light entering the light guiding portion 210 (for example, ⁇ shown in FIG. 5) is greater than the critical angle at which the light guiding portion 210 is totally reflected, the light will be in the first region 211 of the light guiding portion 210. Total reflection occurs, that is, the light energy is not lost; when the incident angle of the light entering the light guiding portion 210 is less than or equal to the critical angle at which the light guiding portion 210 is totally reflected, the light cannot be in the first region 211 of the light guiding portion 210. Total reflection occurs inside, that is, the energy of the light is lost.
  • the light guiding portion 210 when the light guiding portion 210 is applied to the optical path, as long as the critical angle at which the total reflection of the light guiding portion 210 is ensured is greater than the incident angle when the adjacent light enters the first region 211 of the light guiding portion 210, the proximity can be effectively avoided. The light interferes with each other.
  • the first region 211 of the light guiding portion 210 is formed of a light transmissive material
  • the second region 212 is formed of a filter material or a light absorbing material. Since the first region 211 is to ensure the passage of light, the light transmissive material may be selected from materials having a relatively high light transmittance such as glass, PMMA (acrylic), PC (polycarbonate) and the like.
  • the second region 212 needs to block the passage of light, so the second region 212 is selected from a light absorbing material having a better light absorbing effect, such as a black carbon material, a glass fiber cotton or the like.
  • the second region 212 can also use a filter material to filter most of the light, leaving only a small amount of light. In this way, the small amount of light does not cause too much interference to adjacent light, thereby improving the accuracy of light collection.
  • the cross-sectional area of the first region 211 and the cross-sectional area of the second region 212 are as small as possible, and the cross-sectional area of the first region is Greater than the cross-sectional area of the second region.
  • the light guiding portion 210 may first form the second region 212, and then fill the light-filled material in the region surrounded by the second region 212 to form the first region 211.
  • the first region 211 may be formed first, and then the light-absorbing material may be filled in the region surrounded by the first region 211 to form the second region 212. Since the first regions 211 can be formed together, the second regions 212 are formed together, thereby making the preparation process of the light guiding portion 210 simpler.
  • the first region 211 may also be a through hole, so that only the second region 212 may be formed, and the region surrounded by the second region 212 forms the first region 211.
  • the photoelectric sensing module 300 may include a bottom plate 301 and a protective cover 302 disposed on the upper and lower sides.
  • the light sensing unit 303 includes a plurality of light sensing devices which may be formed along the array or may be formed in other arrangements.
  • the light source 304 is disposed outside the light sensing unit 303.
  • the light source 304 can be a self-illuminating structure, such as an organic light emitting diode.
  • the light source 304 can also be disposed under the bottom plate 301, and the bottom plate 301 is formed of a light transmissive material, or a through hole for the light emitted by the light source 304 is formed on the bottom plate 301. structure.
  • the light source 304 is disposed on a side of the bottom plate 303 and directs light from the light source 304 to the protective cover 302 through a light guide plate or a light guide bar. The light emitted from the light source 304 forms the light transmitting region S2; the light emitted from the light source 304 through the protective cover 302 and the light reflected by the finger is received by the light sensing unit 303, and the reflected light forms the light receiving region S1.
  • the light sensing module 300 is further provided with a light guiding component 400.
  • the light guiding component 400 is disposed above the light sensing unit 303 and the light source 304, that is, under the protective cover 302.
  • the light guiding element 400 includes a first light guiding portion 410 disposed on the light receiving unit, that is, the light sensing unit 303, and a second light guiding portion 420 disposed on the light transmitting unit, that is, the light source 304.
  • the second light guiding portion 420 is correspondingly disposed on the light source 304 for causing the light emitted by the light source 304 to propagate to the protective cover 302 in a predetermined direction.
  • the first light guiding portion 410 is disposed on the light sensing unit 303, so that the light reflected by the protective cover 302 and the finger reaches the light sensing unit 303 accurately, and adjacent light rays do not interfere with each other.
  • the surface area of the first light guiding portion 410 is equal to or slightly larger than the surface area of the light sensing unit 303 such that the first light guiding portion 410 completely covers the light sensing unit 303.
  • the surface area of the second light guiding portion 420 is equal to or slightly larger than the surface area of the light source 304 such that the second light guiding portion 420 completely covers the light source 304.
  • the light emitted by the light source 304 passes through the second light guiding portion 420, and reaches the vertical direction of the cover by the propagation direction of the vertical protective cover 302 or the offset.
  • the cover plate 302 is protected and passes through the ridges and valley portions of the fingerprint of the finger, the reflected signal passes through the first light guiding portion 410 and is received by the light sensing unit 303.
  • the light passes through the valley portion of the fingerprint of the finger, since the valley portion is not in contact with the protective cover 302, the light of the portion is totally reflected, and the reflected light passes through the first light guiding portion 410, and is received by the light sensing unit 303.
  • a light sensing device 303a and a light sensing device 303b are received without being disturbed by reflected light from adjacent ridge portions.
  • the light passes through the ridge portion of the finger print, since the ridge portion is in contact with the protective cover 302, the light of the portion is diffusely reflected, and the reflected light passes through the first light guiding portion 410, because the adjacent light passes through the first guide.
  • the light portion 410 either the light is blocked by the second region of the first light guiding portion 410, or the light incident is less than or equal to the total reflection of the first light guiding portion 410 when entering the second region of the first light guiding portion 410.
  • the critical angle so that total reflection cannot occur, and the light will cause energy loss during the propagation in the first region of the first light guiding portion 410, that is, the light intensity after passing through the first light guiding portion 410 is very weak, and substantially no Affects light sensing of light sensing devices. In this way, the accuracy of the light collection is improved by the arrangement of the light guiding element 400, thereby improving the accuracy of fingerprint recognition.
  • the configuration of the first light guiding portion 410 and the second light guiding portion 420 can be referred to the configuration of the light guiding portion.
  • the second light guiding portion 420 needs to ensure complete light transmission, so in some embodiments, The second light guiding portion 420 may not be provided with any structure or may be provided as a light transmissive material layer.
  • the light guiding portion disposed on the light source 304 that is, the second guide In the light portion 420
  • the diameter of the light-passing pipe may be slightly larger than the diameter of the light-passing pipe of the first light guiding portion 410, that is, greater than 25 um.
  • the cross-sectional area of the first region may be larger than that of the first light guiding portion 410. The cross-sectional area of the first region is set slightly larger.
  • the light guiding element 400 in order to prevent the light of the light source 304 from interfering with the sensing of the light sensing unit 303, the light guiding element 400 is in the light emitting region S2 of the light source 304 and the photosensitive region S1 of the light sensing unit 303.
  • a first light-shielding wall 430 is disposed between the first light guiding portion 410 and the second light guiding portion 420. The light receiving region S1 and the light transmitting region S2 can be effectively isolated by the first light shielding wall 430, thereby preventing the light emitted by the light source 304 from affecting the light sensing of the light sensing unit 303.
  • the light source 304 is disposed around the light sensing unit 303 , that is, the light sensing unit 303 is located in the middle, the light source 304 is located outside the light sensing unit 303 , so that the light emitted by the light source 304 passes through the protective cover 302 and the finger 600 . After the reflection, the light sensing unit 303 can be accurately received and absorbed by the light sensing unit 303. Therefore, the second light guiding portion 420 is inclined inwardly, that is, toward the first light guiding portion 410. In some embodiments, the second light guiding portion 420 has an inclination angle ⁇ of 35° to 65°.
  • the tilt angle ⁇ includes, but is not limited to, determined according to the size of the light sensing unit 303 and the thickness of the protective cover 302 to ensure an optimal light guiding effect.
  • the inclination angle ⁇ can be set to 42°, 50°, 56°, 60°, and the like.
  • the mounting angle of the light source 304 may also be set such that the light emitted by the light source 304 is inclined toward the inside, as shown in FIG. Moreover, an angle formed between the mounting plane of the light source 304 and the mounting plane of the light sensing unit 303 is 25° to 55°.
  • the tilt angle includes, but is not limited to, determined according to the size of the light sensing unit 303 and the thickness of the protective cover 302 to ensure an optimal light guiding effect.
  • the inclination angle ⁇ can be set to 30°, 34°, 40°, 48°, and the like.
  • the light of the light source 304 is propagated toward the protective cover 302, and the light guiding element 400 further includes a second disposed at the outermost side of the light transmitting region S2.
  • the second light shielding wall 440 is disposed on the outer side of the light shielding wall 440, that is, the second light guiding portion 420.
  • the light emitted by the light source 304 is transmitted along the second light guiding portion 420 toward the protective cover 302, thereby avoiding light loss, thereby improving the illuminance and increasing the intensity of the light sensing unit 303, thereby improving the light collection. Sharpness.
  • the configuration of the light guiding element 400 is merely an example of the photosensor module applied in the above embodiment, and the configuration of the light guiding element 400 is not limited.
  • the light guiding element can be applied by corresponding deformation
  • the positional relationship, size, and specific structure of the first light guiding portion and the second light guiding portion, etc. are not mentioned here.
  • an electronic device 500 includes the photoelectric sensor module obtained by the preparation method of any of the above embodiments.
  • the photoelectric sensing module is provided with a light guiding element, when the target object is located on the photoelectric sensing module, the light emitted by the light source is reflected back by the protective cover and the finger of the protective photoelectric sensing module. The light passes through the light guiding element and is then collected by the light sensing unit. Moreover, the light guiding element can effectively avoid mutual interference between adjacent light rays, in particular, the reflected light of the diffuse reflection of the light passing through the ridge portion of the finger interferes with the adjacent light, so the electron of the photoelectric sensing module is used. When the device performs image acquisition, the image accuracy of the target object is improved.
  • the electronic device 500 is, for example, a consumer electronic product or a home-based electronic product or a vehicle-mounted electronic product.
  • consumer electronic products such as mobile phones, tablets, notebook computers, desktop monitors, computer integrated machines and other electronic products using biometric identification technology.
  • Home-based electronic products such as smart door locks, televisions, refrigerators, wearable devices and other electronic products that use biometric technology.
  • Vehicle-mounted electronic products such as car navigation systems, car DVDs, etc.
  • the electronic device 500 is a mobile phone.
  • the front surface of the mobile phone is provided with a touch screen and a display device 400 .
  • the photoelectric sensor module is disposed under the front cover of the electronic device 500 .
  • the biometric information to be collected is the fingerprint information
  • the target object 200 is a finger
  • the finger is placed on the electronic device 500, so that the touch screen can determine the finger in the photoelectric sensing module 100.
  • the upper sensing area, the photoelectric sensing module 100 performs subsequent fingerprint information collection.
  • the photoelectric sensor module 100 can also be disposed on the touch screen and the display device 400.
  • the image capturing portion of the photoelectric sensor module 100 can also be integrated into a biometric chip, correspondingly disposed at a suitable position on the front, the back, and the side of the electronic device 500, and can be exposed to the outside of the electronic device 500.
  • the surface may also be disposed inside the electronic device 500 and adjacent to the outer casing.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.

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Abstract

一种导光元件（200）、设置该导光元件（200）的光电传感模组（300）和电子装置（500）。导光元件（200）包括：设置在光传感器件上的导光部（210），用以将预定区域以外的光线去除，使光线在所述预定区域内传输。该导光元件（200）设置于光电传感模组（300），所述电子装置（500）包括该光电传感模组（300）。

Description

导光元件、光电传感模组及电子装置 技术领域
本实用新型涉及生物识别领域，尤其涉及一种导光元件、光电传感模组及具有该生物识别模组的电子装置。
背景技术
目前，光电传感模组，如，指纹识别模组，已逐渐成为移动终端等电子产品的标配组件。然，光电传感模组的图像采集精度还需提高。
实用新型内容
本实用新型实施方式旨在至少解决现有技术中存在的技术问题之一。为此，本实用新型实施方式需要提供一种导光元件、光电传感模组及具有该光电传感模组的电子装置。
本实用新型实施方式的一种导光元件，包括设置在光传感器件上的导光部，用以将预定区域以外的光线去除，使光线在所述预定区域内传输。
在某些实施方式中，所述光传感器件包括光接收单元，且所述导光部包括第一导光部，所述第一导光部设置在所述光接收单元上。
在某些实施方式中，所述光传感器件还包括光发送单元，所述导光部还包括第二导光部，且所述第二导光部设置在所述光发送单元上。
在某些实施方式中，所述导光部包括若干通光管道，且所述若干通光管道的管道壁相互贴合，形成所述预定区域。
在某些实施方式中，位于所述光接收单元上的导光部的通光管道的管径小于位于光发送单元上的导光部的通光管道的管径。
在某些实施方式中，所述导光部包括若干供光线通过的第一区域及与若干阻止光线通过的第二区域，且所述第一区域之间互不连通，形成所述预定区域。
在某些实施方式中，所述第一区域为通孔或由透光材料形成。
在某些实施方式中，所述第二区域由滤光材料或光吸收材料形成。
在某些实施方式中，位于所述光接收单元上的导光部中第一区域的横截面积比位于所述光发送单元上的导光部中第一区域的横截面积小。
在某些实施方式中，位于所述光发送单元上的导光部沿需要的光传输方向倾斜设置。
在某些实施方式中，所述第二导光部朝靠近所述第一导光部的一侧倾斜设置。
在某些实施方式中，所述第二导光部的倾斜角度为35°～65°。
在某些实施方式中，所述导光元件还包括设置在所述第一导光部与所述第二导光部之间的第一遮光墙。
在某些实施方式中，所述导光元件还包括设置在所述第二导光部外侧的第二遮光墙。
在某些实施方式中，所述光接收单元上的光线进入预定区域内，入射角大于预设角度的光线在预定区域内发生全反射。
在某些实施方式中，所述通光管道的横截面形状为圆形、椭圆形、三角行、多边形、或不规则形状。
在某些实施方式中，所述位于光接收单元上的导光部的通光管道的管径低于25um。
在某些实施方式中，所述导光元件用在光学式图像传感模组中。
本实用新型实施方式的一种光电传感模组，包括光传感器件，以及设置在光传感器件上的上述任一实施方式的导光元件。
本实用新型实施方式的一种电子装置，包括上述任一实施方式的光电传感模组。
通过设置导光元件，使得光电传感模组在进行生物识别时，具有如下有点：
(1)在光电传感模组进行光感测时，通过导光元件，阻止邻近的光线通过，从而使得导光元件下方的光感应单元接收到的光信号避免了邻近光线的干扰，提高了光线采集的准确率和清晰度，进而提高了生物识别的准确率。
(2)该导光元件可以独立制备后，再设置于光电传感模组中，从而大大加快了光电传感模组的制备工艺。
(3)该导光元件不但可以控制光接收单元上的光线传播，避免邻近光线之间的相互干扰，而且还可以控制光发送单元上的光线传播，使得光源发出的光线按照预设的传播方向均朝保护盖板传播，因此增加了到达保护盖板的光信号强度，从而提高了光线采集的清晰度，进而提高了生物识别的准确率。
本实用新型实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本实用新型实施方式的实践了解到。
附图说明
本实用新型实施方式的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是本实用新型光学式指纹识别模组进行指纹识别时的光路示意图；
图2是本实用新型实施方式的导光元件一实施例的截面结构示意图；
图3是本实用新型实施方式的导光元件另一实施例的俯视结构示意图；
图4a是本实用新型实施方式的导光元件又一实施例的俯视结构示意图；
图4b是本实用新型实施方式的导光元件又一实施例的俯视结构示意图；
图5是本实用新型实施方式的导光元件中光线经过时的光路示意图；
图6是本实用新型实施方式的光电传感模组一实施例的结构示意图；
图7是本实用新型实施方式的光电传感模组中的光路示意图；
图8是本实用新型实施方式的光电传感模组另一实施例的结构示意图；
图9是本实用新型实施方式的光电传感模组又一实施例的结构示意图；
图10是本实用新型方式的光电传感模组又一实施例的结构示意图；
图11是本实用新型实施方式的电子装置的平面示意图。
具体实施方式
下面详细描述本实用新型的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本实用新型，而不能理解为对本实用新型的限制。
在本实用新型的描述中，需要理解的是，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本实用新型的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本实用新型的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通信；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本实用新型中的具体含义。
下文的公开提供了许多不同的实施方式或例子用来实现本实用新型的不同结构。为了简化本实用新型的公开，下文中对特定例子的部件和设定进行描述。当然，它们仅仅为示例，并且目的不在于限制本实用新型。此外，本实用新型可以在不同例子中重复参 考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设定之间的关系。此外，本实用新型提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
进一步地，所描述的特征、结构可以以任何合适的方式结合在一个或更多实施方式中。在下面的描述中，提供许多具体细节从而给出对本实用新型的实施方式的充分理解。然而，本领域技术人员应意识到，没有所述特定细节中的一个或更多，或者采用其它的结构、组元等，也可以实践本实用新型的技术方案。在其它情况下，不详细示出或描述公知结构或者操作以避免模糊本实用新型。
现有的一种光电传感模组，以光电传感模组为例，如图1所示，该光电传感模组包括底板101，设置在底板101上的光源102、光感应单元103，以及保护盖板104。光感应单元103位于光源102的内侧，且包括多个光感应器件形成的阵列结构。当手指105放置在保护盖板104上时，光源102发出的光到达保护盖板104后，由于手指指纹具有谷和脊两部分，所以光线经过脊的部分将发生漫反射，光线经过谷的部分将发生镜面反射。反射后的光线将由光感应单元103接收，并由光感应单元103将接收到的光信号转换为相应的电信号，并传输给信号处理电路。由于指纹的谷和脊的反射信号出现较大差异，即接收到指纹的谷的反射信号的光感应器件输出的电信号较强，接收到指纹的脊的反射信号的光感应器件输出的电信号较弱，因此信号处理电路根据光感应单元103中各光感应器件输出的电信号的强弱确定指纹的脊和谷的位置，进而形成指纹图像。
然而，由于指纹的谷和脊之间的间距也非常小，而且光线经过指纹的脊的部分又会发生漫反射，故而邻近的反射信号互相干扰，光感应单元103中各光感应器件实际接收到的反射信号无法反映真实的反射信号，从而造成光学式指纹传感器采集的指纹图像的清晰度和准确率较低。
对此，本实用新型提出一种导光元件，该导光元件可应用于光电传感模组，尤其是光学式图像识别模组，该光学式图像识别模组将感测目标物体的图像信息，以根据感测的图像信息识别目标物体的身份。而该图像信息可包括指纹信息、掌纹信息、耳纹信息以及人体其他位置的皮肤纹理信息。当然，并不排除该导光元件应用于光学式的其他识别技术中，以解决利用光线进行图像采集的问题。
该导光元件主要设置在光传感器件上，以对光传感器件发出或接收的光线传输进行控制，例如将预定区域以外的光线去除，使得光线在预定的区域内传输。如此使得邻近的光线之间不会互相干扰，提高了光线采集的准确率和清晰度。
请参照图2，本实用新型实施方式的一种导光元件200，包括设置在光传感器件上的导光部210。每个导光部210包括若干可供光线通过的第一区域211和若干阻止光线通过的第二区域212。即光线自导光部210的一侧进入，经过第一区域211时，将进入第一区域211，并在第一区域211内传输，并由导光部210的另一侧射出；经过第二区域212时，将被第二区域212阻止，从而使得经过第二区域212的光线不通过或者非常弱，基本不影响光感应单元303的光线感测，从而邻近的光线之间不会互相干扰，提高了光线采集的准确率和清晰度。
在一些例子中，上述导光部210可成一体结构，如图3所示，该第二区域212之间连成一体，并界定出若干个第一区域211，各个第一区域211之间互不连通。如此使得该导光部210的制备工艺更加简单，而且增加了导光部210的结构强度。再者，一体结构的导光部210也便于设置于光传感器件上。
请参照图4a及图4b，该实施方式中的导光部210可包括若干通光管道213，该通光管道213通过粘接、捆绑等方式形成导光部210。该通光管道213包括管壁2131及管壁2131围合形成的光通路，即通光孔2132。各通光管道213的管壁2131共同形成第二区域212，各通光管道213的通光孔2132共同形成第一区域211。该通光孔2132的横截面形状可为圆形、椭圆形、三角形、多边形等等。由于该多个通光管路213之间贴合形成导光部210，因此三角形或多边形的通光管路213之间可以实现无缝隙贴合，从而避免光线从通光管路213之间的缝隙穿过。当然，若通光管路213的孔径足够小，则其他形状的通光管路213之间也可以实现基本无缝隙。可变更地，各通光管路213之间的缝隙还可以通过填充材料填充，以形成第二区域212的一部分。
为了减少邻近光线之间的互相干扰，上述通光孔2132的孔径尽可能小，例如低于25um；而且，上述通光管道213的管壁尽可能薄，例如1-2um。
上述通光管道213可以独立制备后，再通过粘接、捆绑等方式进行固定，以形成导光部210，如此可以加快导光部210的制备进程。而且该通光管道213还可以利用现有的结构实现，例如光纤。如此简化了制备工艺，而且降低了制备成本。
光线在上述第一区域211内的传输采用了光的全反射原理，如图5所示，以通孔2132为例，光线从通孔2132的一端进入后，垂直进入的光线L1会沿通孔2132从通孔2132的另一端垂直射出，当光线L2与垂直于通孔2132的内侧管壁的法线M1之间的夹角θ大于通孔2132的临界角时，光线在通孔2132内发生全反射，经过多次全反射后从通孔2132的另一端射出。由于光线在导光部210内的传输过程中，若发生全反射时，能量不 会损失，否则能量将会受损。换句话说，当光线进入导光部210的入射角(例如图5所示的θ)大于导光部210发生全反射的临界角度时，该光线将在导光部210的第一区域211内发生全反射，即该光线能量不会损失；当光线进入导光部210的入射角小于或等于导光部210发生全反射的临界角度时，该光线不能在导光部210的第一区域211内发生全反射，即该光线能量会损失。因此，当该导光部210应用于光路中时，只要保证导光部210发生全反射的临界角度大于邻近的光线进入导光部210的第一区域211时的入射角，就可以有效避免邻近的光线之间互相发生干扰。
请继续参照图2，在其他实施方式中，导光部210中的第一区域211由透光材料形成，第二区域212由滤光材料或吸光材料形成。由于该第一区域211要保证光通过，因此透光材料可以选用透光率较大的材料，例如玻璃、PMMA(亚克力)、PC(聚碳酸酯)等等。第二区域212需要阻止光通过，因此第二区域212选用吸光效果较好的吸光材料，例如黑色碳材料、玻璃纤维棉等等。当然，该第二区域212也可以选用滤光材料，将大部分的光线都过滤掉，只剩下少量的光线通过。如此，该少量的光线基本对邻近的光线不会造成太大的干扰，从而也提高了光线采集的准确率。
为了避免邻近光线之间的互相干扰，提高光线采集的准确率和清晰度，上述第一区域211的横截面积与第二区域212的横截面积尽可能小，且第一区域的横截面积大于第二区域的横截面积。
上述导光部210可以先形成第二区域212，再在第二区域212围成的区域内填充透光材料，形成第一区域211。当然，也可以先形成第一区域211，再在第一区域211围成的区域内填充吸光材料，形成第二区域212。由于第一区域211可以一起形成，再一起形成第二区域212，因此使得导光部210的制备工艺更加简单。
在另一些实施方式中，上述第一区域211也可以为通孔设置，如此可以仅形成第二区域212，第二区域212围成的区域即形成第一区域211。当然，还可以先提供一吸光材料的板材，再在该板材上利用激光等方式形成若干个第一区域211。
请参照图6，上述具有导光部的导光元件应用于光电传感模组300时，该光电传感模组300可包括呈上下设置的底板301和保护盖板302，该底板301上设有光感应单元303和光源304。光感应单元303包括若干光感应器件，该光感应器件可沿阵列形成，也可按照其他的排列方式形成。光源304设置在光感应单元303的外侧。该光源304可以为自发光结构，例如有机发光二极管。若该当然该光源304也可以设置在底板301下方，且底板301为透光材料形成，或者底板301上形成供光源304发出的光通过的通孔 结构。在一些例子中，该光源304设置在底板303的侧边，并通过导光板或导光条将光源304发出的光线引导至保护盖板302。光源304发出的光线形成光发送区域S2；光源304发出的光线经保护盖板302及手指反射回来的光线被光感应单元303接收，则反射回来的光线形成光接收区域S1。
上述光电传感模组300上还设有导光元件400，该导光元件400设置在光感应单元303和光源304上方，也就是保护盖板302的下方。该导光元件400包括设置在光接收单元，即光感应单元303上的第一导光部410，和设置在光发送单元，即光源304上的第二导光部420。第二导光部420对应设置于光源304上，用于使得光源304发出的光线按照预定的方向传播至保护盖板302。该第一导光部410对应设置于光感应单元303上，用于使得经保护盖板302及手指反射回来的光线准确到达光感应单元303上，且邻近的光线之间不会互相发生干扰。
在一些实施方式中，第一导光部410的表面积等于或略大于光感应单元303的表面积，使得第一导光部410完全覆盖于光感应单元303。第二导光部420的表面积等于或略大于光源304的表面积，使得第二导光部420完全覆盖于光源304上。
请结合参照图7，当手指600放置在保护盖板302上时，光源304发出的光线经过第二导光部420，通过垂直保护盖板302的传播方向或偏移保护盖板的垂直方向到达保护盖板302，并经过手指指纹的脊和谷部分时发生反射，反射后的信号经过第一导光部410后被光感应单元303接收。当光线经过手指指纹的谷部分时，由于谷部分未与保护盖板302接触，因此该部分的光线发生全反射，反射后的光线经过第一导光部410后，均被光感应单元303的一个光感应器件303a和光感应器件303b接收，并未受到邻近的脊部分的反射光线的干扰。当光线经过手指指纹的脊部分时，由于脊部分与保护盖板302接触，因此该部分的光线发生漫反射，反射后的光线经过第一导光部410后，由于邻近的光线经过第一导光部410时，要么光线被第一导光部410的第二区域阻止，要么光线在进入第一导光部410的第二区域时，入射角小于或等于第一导光部410的全反射的临界角度，因此无法发生全反射，光线将在第一导光部410的第一区域内的传播过程中造成能量损失，即经过第一导光部410后的光线强度非常弱，基本不会影响光感应器件的光感测。如此，通过导光元件400的设置，提高了光线采集的准确率，进而提高了指纹识别的准确率。
需要说明的是，上述第一导光部410与第二导光部420的结构可参照上述导光部的结构。然，可替换地，该第二导光部420需要保证完全透光，因此在一些实施方式中， 该第二导光部420也可以不设置任何结构，或者设置为透光材料层。
另外，为了保证光感应单元303能感应到更多的光线，即要保证光源304发出的光线尽可能多的传播至保护盖板302，因此设置在光源304上的导光部，即第二导光部420，通光管道的管径可以比第一导光部410的通光管道的管径设置的稍大，即大于25um。同理，对于导光部的另一中结构，也可以设置在光源304上的导光部，即第二导光部420中，第一区域的横截面积可以比第一导光部410中第一区域的横截面积设置的稍大。
在一些实施方式中，如图8所示，为了避免光源304的光线对光感应单元303的感测造成干扰，上述导光元件400在光源304的发光区S2与光感应单元303的感光区S1之间的邻接处设置第一遮光墙430，即第一导光部410与第二导光部420之间设置第一遮光墙430。通过第一遮光墙430可将光接收区域S1与光发送区域S2进行有效的隔离，从而避免光源304发出的光线影响光感应单元303的光感测。
请参照图9，由于光源304围绕光感应单元303设置，即光感应单元303位于中间，光源304位于光感应单元303的外侧，因此，为了使得光源304发出的光线经过保护盖板302及手指600的反射后，能够准确到达光感应单元303并被光感应单元303吸收，因此该第二导光部420向内倾斜设置，即朝第一导光部410靠拢。在一些实施方式中，该第二导光部420的倾斜角β为35°～65°。该倾斜角度β包括但不局限于根据光感应单元303的尺寸大小以及保护盖板302的厚度大小来确定，以保证最佳的导光效果。例如，该倾斜角度β可设置为42°、50°、56°、60°等等。
然，在其他实施方式中，也可以设置光源304的安装角度，以使光源304发出的光线朝内侧倾斜，如图10所示。而且该光源304的安装平面与光感应单元303的安装平面之间形成的夹角为25°～55°。该倾斜角度包括但不局限于根据光感应单元303的尺寸大小以及保护盖板302的厚度大小来确定，以保证最佳的导光效果。例如，该倾斜角度β可设置为30°、34°、40°、48°等等。
继续参照图9，在另一些实施方式中，为了阻止光源304的光发散，使得光源304的光线均朝保护盖板302传播，导光元件400还包括设置在光发送区域S2最外侧的第二遮光墙440，即第二导光部420的外侧设置第二遮光墙440。如此，使得光源304发出的光线均沿第二导光部420朝保护盖板302传播，避免了光损失，从而提高发光照度，增加光感应单元303感测光线的强度，进而提高了光线采集的清晰度。
需要说明的是，上述导光元件400的结构仅为应用在上述实施方式中的光电传感模组的一个例子，并不限定导光元件400的结构。该导光元件可以通过相应的变形，应用 于其他结构的光电传感模组，例如第一导光部和第二导光部的位置关系、尺寸及具体的结构等等，这里不一一例举。
请参照图11，本实用新型实施方式的一种电子装置500，包括如上任一实施方式的制备方法所获得的光电传感模组。
上述电子装置500中，由于光电传感模组设置了导光元件，在目标物体位于光电传感模组上时，光源发出的光线经过保护光电传感模组的保护盖板及手指反射回来的光线，先经过导光元件，再被光感应单元采集。而且该导光元件可以有效地避免邻近光线之间地互相干扰，尤其是光线经过手指的脊部分所发生的漫反射的反射光线对邻近光线的干扰，因此使用了该光电传感模组的电子装置在进行图像采集时，提高了采集目标物体的图像精度。
具体地，电子装置500如为消费性电子产品或家居式电子产品或车载式电子产品。其中，消费性电子产品如为手机、平板电脑、笔记本电脑、桌面显示器、电脑一体机等各类应用生物识别技术的电子产品。家居式电子产品如为智能门锁、电视、冰箱、穿戴式设备等各类应用生物识别技术的电子产品。车载式电子产品如为车载导航仪、车载DVD等。
在图11的示例中，电子装置500为手机，手机的正面设置有触摸屏及显示装置400，光电传感模组设置在电子装置500的前盖板下方。在一个例子中，当需要采集的生物特征信息为指纹信息时，在执行指纹信息采集时，目标物体200为手指，手指放置在电子装置500上，使得触摸屏能够确定手指在光电传感模组100上的接触区域，光电传感模组100进行后续指纹信息的采集。
然，可变更地，在其它实施方式中，所述光电传感模组100也可设置在触摸屏及显示装置400上。另外，所述光电传感模组100的图像采集部分也可集成为生物识别芯片，对应设置在电子装置500的正面、背面、以及侧面等合适位置，且，既可曝露出电子装置500的外表面，也可设置在电子装置500内部并邻近外壳。
需要指出的是，上述例子是为了方便理解本实用新型实施方式而作出的一些例子，而不应理解为对本实用新型保护范围的限制。
在本说明书的描述中，参考术语“一个实施方式”、“某些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”等的描述意指结合所述实施方式或示例描述的具体特征、结构、材料或者特点包含于本实用新型的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述 的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本实用新型的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
尽管上面已经示出和描述了本实用新型的实施方式，可以理解的是，上述实施方式是示例性的，不能理解为对本实用新型的限制，本领域的普通技术人员在本实用新型的范围内可以对上述实施方式进行变化、修改、替换和变型。

Claims (20)

  1. 一种导光元件，其特征在于，包括设置在光传感器件上的导光部，用以将预定区域以外的光线去除，使光线在所述预定区域内传输。
  2. 如权利要求1所述的导光元件，其特征在于，所述光传感器件包括光接收单元，且所述导光部包括第一导光部，所述第一导光部设置在所述光接收单元上。
  3. 如权利要求2所述的导光元件，其特征在于，所述光传感器件还包括光发送单元，所述导光部还包括第二导光部，且所述第二导光部设置在所述光发送单元上。
  4. 如权利要求2或3所述的导光元件，其特征在于，所述导光部包括若干通光管道，且所述若干通光管道的管道壁相互贴合，形成所述预定区域。
  5. 如权利要求4所述的导光元件，其特征在于，位于所述光接收单元上的导光部的通光管道的管径小于位于所述光发送单元上的导光部的通光管道的管径。
  6. 如权利要求2或3所述的导光元件，其特征在于，所述导光部包括若干供光线通过的第一区域及与若干阻止光线通过的第二区域，且所述第一区域之间互不连通，形成所述预定区域。
  7. 如权利要求6所述的导光元件，其特征在于，所述第一区域为通孔或由透光材料形成。
  8. 如权利要求6所述的导光元件，其特征在于，所述第二区域由滤光材料或光吸收材料形成。
  9. 如权利要求6所述的导光元件，其特征在于，位于所述光接收单元上的导光部中第一区域的横截面积比位于所述光发送单元上的导光部中第一区域的横截面积小。
  10. 如权利要求3所述的导光元件，其特征在于，位于所述光发送单元上的导光部沿需要的光传输方向倾斜设置。
  11. 如权利要求10所述的导光元件，其特征在于，所述第二导光部朝靠近所述第一导光部的一侧倾斜设置。
  12. 如权利要求11所述的导光元件，其特征在于，所述第二导光部的倾斜角度为35°～65°。
  13. 如权利要求3所述的导光元件，其特征在于，所述导光元件还包括设置在所述第一导光部与所述第二导光部之间的第一遮光墙。
  14. 如权利要求3或13所述的导光元件，其特征在于，所述导光元件还包括设置 在所述第二导光部外侧的第二遮光墙。
  15. 如权利要求1所述的导光元件，其特征在于，所述光接收单元上的光线进入预定区域内，入射角大于预设角度的光线在预定区域内发生全反射。
  16. 如权利要求4所述的导光元件，其特征在于，所述通光管道的横截面形状为圆形、椭圆形、三角行、多边形、或不规则形状。
  17. 如权利要求4所述的导光元件，其特征在于，所述位于光接收单元上的导光部的通光管道的管径低于25um。
  18. 如权利要求1所述的导光元件，其特征在于，所述导光元件用在光学式图像传感模组中。
  19. 一种光电传感模组，其特征在于，包括光传感器件以及设置在所述光传感器件上的如权利要求1-18任一项所述的导光元件。
  20. 一种电子装置，其特征在于，包括如权利要求19所述的光电传感模组。
PCT/CN2017/084980 2017-05-18 2017-05-18 导光元件、光电传感模组及电子装置 Ceased WO2018209660A1 (zh)

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