WO2021031576A1 - 指纹感测装置 - Google Patents

指纹感测装置 Download PDF

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Publication number
WO2021031576A1
WO2021031576A1 PCT/CN2020/083456 CN2020083456W WO2021031576A1 WO 2021031576 A1 WO2021031576 A1 WO 2021031576A1 CN 2020083456 W CN2020083456 W CN 2020083456W WO 2021031576 A1 WO2021031576 A1 WO 2021031576A1
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WO
WIPO (PCT)
Prior art keywords
fingerprint
optical fiber
sensing device
core
image sensor
Prior art date
Application number
PCT/CN2020/083456
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English (en)
French (fr)
Inventor
叶肇懿
Original Assignee
神盾股份有限公司
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Publication date
Application filed by 神盾股份有限公司 filed Critical 神盾股份有限公司
Priority to US17/634,552 priority Critical patent/US20220283353A1/en
Publication of WO2021031576A1 publication Critical patent/WO2021031576A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
    • 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
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
    • G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
    • G02B6/08—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images with fibre bundle in form of plate

Definitions

  • the invention relates to a fingerprint sensing device.
  • fingerprint recognition technology has excellent recognition rate and accuracy, it has the widest application level.
  • optical fingerprint recognition has advantages in cost, so it is the mainstream of fingerprint recognition technology at this stage.
  • the principle of the existing optical fingerprint recognition technology is that light is projected by a light source, and the light is transmitted to the fingerprint by the light guide element.
  • the fingerprint on the finger reflects the light and is again transmitted back to the sensor by the light guide element. Then, the fingerprint pattern is sensed according to the reflected light and compared with the fingerprint image stored in the system to achieve the recognition function.
  • the present invention provides a fingerprint sensing device, which can have good optical quality in a relatively thin volume.
  • a fingerprint sensing device which is suitable for sensing a user's fingerprint, and includes an image sensor, a light source, and a light guide plate.
  • the image sensor is arranged on the first side of the light guide plate
  • the light source is arranged on the second side of the light guide plate.
  • the first side is opposite to the second side.
  • the light guide plate includes a plurality of optical fiber elements, wherein each optical fiber element includes a fingerprint end adjacent to the fingerprint and a sensing end adjacent to the image sensor. The cross-sectional area of the core of the optical fiber element decreases from the fingerprint end to the sensing end.
  • the fingerprint sensing device of the embodiment of the present invention since the cross-sectional area of the core of the optical fiber element in the light guide plate decreases from the fingerprint end to the sensing end, the light concentration of the light beam emitted from the sensing end is relatively high, so the image The fingerprint image sensed by the sensor is of good quality, and the fingerprint sensing device has a small volume, which conforms to the current trend of miniaturization of electronic devices.
  • FIG. 1 is a schematic diagram of a fingerprint recognition device according to an embodiment of the invention.
  • Fig. 2A is a schematic top view of the light guide plate in Fig. 1 at the fingerprint end.
  • FIG. 2B is a schematic top view of the light guide plate in FIG. 1 at the sensing end.
  • Figure 3 is a schematic diagram of the appearance of the core of the optical fiber component in Figure 1
  • 4A is a schematic top view, a schematic cross-sectional view, and a corresponding optical simulation diagram of the optical fiber component at the fingerprint end and the sensing end of a comparative embodiment.
  • 4B is a schematic top view, a schematic cross-sectional view, and a corresponding optical simulation diagram of the optical fiber component at the fingerprint end and the sensing end according to an embodiment of the present invention.
  • 5A is a partial schematic top view of the light guide plate at the fingerprint end according to another embodiment of the present invention.
  • FIG. 5B is a partial schematic top view of the light guide plate of FIG. 5A at the sensing end.
  • FIG. 6 is a schematic diagram of the appearance of the core of the optical fiber component in FIG. 5A.
  • 130, 130a light guide plate
  • A1, A2 cross section
  • IB beam
  • RB reflected beam
  • W W1a, W2a, Wb1, Wb2: width
  • FIG. 1 is a schematic diagram of a fingerprint recognition device according to an embodiment of the invention.
  • Fig. 2A is a schematic top view of the light guide plate in Fig. 1 at the fingerprint end.
  • 2B is a schematic top view of the light guide plate in FIG. 1 at the sensing end.
  • Fig. 3 is a schematic diagram of the appearance of the core of the optical fiber component in Fig. 1.
  • the fingerprint recognition device 100 includes an image sensor 110, a light source 120, a light guide plate 130 and a transparent cover plate 140, which is suitable for sensing a user's fingerprint.
  • an image sensor 110 a light source 120
  • a light guide plate 130 a light guide plate 130
  • a transparent cover plate 140 which is suitable for sensing a user's fingerprint.
  • the image sensor 110 is an electronic component that can convert light signals into electrical signals, thereby converting image light beams from objects into image data.
  • the type of the image sensor 110 is, for example, a thin film transistor image sensor or other suitable image sensors, and the invention is not limited thereto.
  • the image sensor 110 is disposed on the first side S1 (for example, the lower side) of the light guide plate 130.
  • the light source 120 is a photoelectric element that can emit a light beam.
  • the light source 120 may be a display panel.
  • the light source 120 may also be a light emitting diode, an organic light emitting diode or other suitable light emitting elements, and the invention is not limited thereto.
  • the light source 120 is disposed on the second side S2 (for example, the upper side) of the light guide plate 130, and the light source 120 is disposed between the transparent cover plate 140 and the light guide plate 130.
  • the light guide plate 130 is a plate-shaped element composed of a plurality of optical fiber elements 132, in which light beams are suitable for transmission in the optical fiber elements 132.
  • each optical fiber element 132 includes a core 132a and a covering portion 132b, wherein the covering portion 132b covers the core 132a, in other words, the inner surface of the covering portion 132b and the fiber
  • the outer surface of the core 132a is conformal.
  • the refractive index of the core 132a is greater than the refractive index of the cladding portion 132b.
  • Each optical fiber element 132 includes a fingerprint end E1 adjacent to the fingerprint and a sensing end E2 adjacent to the image sensor 110.
  • these optical fiber elements 132 are arranged in an array and correspond to each pixel unit (not shown) of the image sensor 110.
  • two adjacent optical fiber elements 132 are respectively provided with spacings D1 and D2.
  • the spacing D1 is, for example, 3 microns
  • the spacing D2 is, for example, 4 microns.
  • the above numerical values are only examples, and the present invention is not limited thereto.
  • the core 132a has a cross section A1 at the fingerprint end E1, a cross section A2 at the sensing end E2, and a side surface S connected to the cross sections A1 and A2, wherein the side surface S is, for example, an inclined surface.
  • the shape center C1 of the cross section A1 of the core 132a at the fingerprint end E1 is located at the shape center C2 of the cross section A2 of the core 132a at the sensing end E2. It can be seen from FIGS. 2A and 2B that the area of the section A1 of the core 132a at the fingerprint end E1 is larger than the area of the section A2 of the core 132a at the sensing end E2. In detail, please refer to FIG. 2A.
  • the cross-section A1 of the core 132a at the fingerprint end E1 is square, and its width W1a is, for example, 8 microns, that is, the area of the cross-section A1 of the core 132a at the fingerprint end E1.
  • it is 64 square microns.
  • the shape of the cross section A2 of the core 132a at the sensing end E2 is square, and the width W2a thereof is, for example, 6 micrometers, that is, the area of the cross section A2 of the core 132a at the sensing end E2 is, for example, 64 square micrometers. It can be seen from FIGS.
  • the cross-sectional shape of the covering portion 132b at the fingerprint end E1 is a hollow square, and its width Wb1 is, for example, 9 microns, that is, the cross-sectional area of the covering portion 132b at the fingerprint end E1 is, for example, 17 square microns.
  • the cross-sectional shape of the covering portion 132b at the sensing end E2 is a hollow square, and the width Wb2 thereof is, for example, 7 microns, that is, the cross-sectional area of the covering portion 132b at the fingerprint end E1 is, for example, 13 square microns. It can be seen from FIG. 1 that from the fingerprint end E1 to the sensing end E2, the area of the covering portion 132b is decreasing. It should be noted that the above numerical values are only examples, and the present invention is not limited thereto.
  • the length L of the optical fiber element 132 falls within the range of 4 microns to 10 microns, which is not in the present invention. Is limited.
  • the light-transmitting cover 140 is an optical element that allows light beams to pass through, and its material is, for example, glass, and provides the aforementioned element protection function.
  • the transparent cover 140 is disposed on the second side S2 of the light guide plate 130.
  • the light source 120 emits a light beam IB.
  • the light beam IB penetrates the transparent cover 140 and is transmitted to the fingerprint on the finger OB.
  • the fingerprint reflects the light beam IB to form a reflected light beam RB, wherein the reflected light beam RB has fingerprint image information.
  • the reflected light beam RB enters the core 132a of the optical fiber element 132 from the fingerprint end E1, undergoes one or more times of total reflection in the core 132a, and leaves the core 132a from the sensing end E2 to be transmitted to the image sensor 110.
  • the image sensor 110 receives the reflected light beam RB and converts the optical signal into an electrical signal to sense the fingerprint pattern and compare it with the fingerprint image stored in the system, thereby achieving the recognition function.
  • 4A is a schematic top view, a schematic cross-sectional view, and a corresponding optical simulation diagram of the optical fiber component at the fingerprint end and the sensing end of a comparative embodiment.
  • 4B is a schematic top view, a schematic cross-sectional view, and a corresponding optical simulation diagram of the optical fiber component at the fingerprint end and the sensing end according to an embodiment of the present invention.
  • the optical fiber component 132' of the comparative embodiment includes a core 132a' and a coating portion 132b'.
  • the shape of the core 132a' is a rectangular column
  • the shape of the covering portion 132b' is a hollow rectangular column.
  • the cross-sectional shapes of the core 132a' at the fingerprint end E1 and the sensing end E2 are all square, and the width W'is, for example, 6 microns.
  • the width W" of the covering portion 132b' at the fingerprint end E1 and the sensing end E2 is, for example, 7 microns.
  • the sectional shape of the covering portion 132b' at the fingerprint end E1 and the sensing end E2 is a hollow square, and its width W'is, for example, 6 microns.
  • the distance D'between two adjacent optical fiber elements 130' is, for example, 3 microns. It should be noted that the above-mentioned values are only examples, and the present invention is not limited thereto.
  • the light efficiency is calculated to be about 5.5%, the image contrast at the position P1 is 21.22%, and the image contrast at the position P2 is 20.7%.
  • the light efficiency is calculated to be about 8.71%, the image contrast at the position P1 is 22.47%, and the image contrast at the position P2 is 22%.
  • the cross-sectional area of the core 132a of the optical fiber element 132 of this embodiment decreases from the fingerprint end E1 to the sensing end E2, the output from the sensing end E2
  • the light concentration of the reflected light beam RB is relatively high, so the fingerprint image sensed by the image sensor 110 has a good light efficiency, and the fingerprint sensor device 100 has a small volume, which conforms to the current trend of miniaturization of electronic devices.
  • the stray light beam not from the finger OB is transmitted into the core 132a, since the side surface S of the core 132a is inclined, the stray light beam can be reflected by the side surface and be reflected by the fingerprint end E1.
  • the output from the optical fiber element 132 can reduce the optical crosstalk phenomenon of stray light. Therefore, the fingerprint image sensed by the image sensor 110 has a good contrast, thereby improving the fingerprint resolution.
  • 5A is a partial schematic top view of the light guide plate at the fingerprint end according to another embodiment of the present invention.
  • 5B is a partial schematic top view of the light guide plate of FIG. 5A at the sensing end.
  • Fig. 6 is a schematic diagram of the appearance of the optical fiber component in Fig. 5A.
  • the light guide plate 130a in the above figures is similar to the light guide plate 130 of FIGS. 1, 2A to 2B and 3, and the main difference lies in the shape of the core 132aa of the light guide plate 130a It is a truncated cone, and the shape of the covering portion 132ba is a hollow truncated cone.
  • the fingerprint sensing device of the embodiment of the present invention since the cross-sectional area of the fiber core of the optical fiber element in the light guide plate decreases from the fingerprint end to the sensing end, the light concentration of the light beam emitted from the sensing end is It is higher, so the quality of the fingerprint image sensed by the image sensor is good, and the fingerprint sensing device has a smaller volume, which conforms to the current trend of miniaturization of electronic devices.
  • the side surface of the core is inclined, when the stray beam is incident on the core, the stray beam can be reflected on the inclined surface multiple times and then emitted from the fingerprint end, preventing the image sensor at the sensing end from receiving the stray beam , So the fingerprint sensor device has good image contrast.

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Abstract

一种指纹感测装置，其适于感测用户的指纹，包括影像传感器（110）、光源（120）以及光导板（130）。影像传感器（110）设置于光导板（130）的第一侧（S1），光源（120）设置于光导板（130）的第二侧（S2）。第一侧（S1）相对于第二侧（S2）。光导板（130）包括多个光纤元件（132），其中各光纤元件（132）包括邻近于指纹的指纹端（E1）与邻近影像传感器（110）的感测端（E2）。光纤元件（132）的纤核（132a）的截面积由指纹端（E1）至感测端（E2）递减。该指纹感测装置可在较薄的体积下兼具有良好的光学质量。

Description

指纹感测装置 技术领域
本发明涉及一种指纹感测装置。
背景技术
随着生物辨识技术逐渐成熟，许多不同的生物特征用来辨识用户的身分。由于指纹辨识技术的辨识率与准确率优良，其应用层面最广，其中因光学式指纹辨识在成本上具有优势，故为现阶段指纹辨识技术的主流。
现有的光学式指纹辨识技术的原理是藉由光源投射出光线，光线藉由光导引元件传递至指纹，手指上的指纹反射光线以再一次地藉由光导引元件传递回传感器，传感器再依据反射光线感测指纹图样并与***内部的存储的指纹影像比对，藉此达到辨识的功能。
然而，现有光学式指纹辨识技术仍无法在较薄的体积下达良好的影像对比度、指纹影像亮度与指纹分辨率等，因此如何解决上述问题便成为了本领域的技术人员努力的方向之一。
发明内容
有鉴于此，本发明提供一种指纹感测装置，其可在较薄的体积下兼具有良好的光学质量。
根据本发明的实施例提供一种指纹感测装置，其适于感测用户的指纹，包括影像传感器、光源以及光导板。影像传感器设置于光导板的第一侧，光源设置于光导板的第二侧。第一侧相对于第二侧。光导板包括多个光纤元件，其中各光纤元件包括邻近于指纹的指纹端与邻近影像传感器的感测端。光纤元件的纤核的截面积由指纹端至感测端递减。
在本发明的实施例的指纹感测装置中，由于光导板内光纤元件的纤核截面积由指纹端至感测端递减，故由感测端出射的光束的光集中程度较高，因此影像传感器感测到的指纹影像质量良好，且指纹感测装置具有较小的体积，符合现行电子装置微型化的趋势。
附图说明
包含附图以便进一步理解本发明，且附图并入本说明书中并构成本说明书的一部分。附图说明本发明的实施例，并与描述一起用于解释本发明的原理。
图1为本发明一实施例的指纹辨识装置的示意图。
图2A为图1中光导板在指纹端的上视示意图。
图2B为图1中光导板在感测端的上视示意图。
图3为图1中光纤元件的纤核的外观示意图
图4A为一比较实施例的光纤元件在指纹端与感测端的上视示意图、剖面示意图以及相应的光学模拟图。
图4B为本发明的一实施例的光纤元件在指纹端与感测端的上视示意图、剖面示意图以及相应的光学模拟图。
图5A为本发明另一实施例的光导板在指纹端的上视局部示意图。
图5B为图5A的光导板在感测端的上视局部示意图。
图6为图5A中光纤元件的纤核的外观示意图。
附图标号说明
100：指纹辨识装置；
110：影像传感器；
120：光源；
130、130a：光导板；
132、132’：光纤元件
132a、132a’、132aa：纤核；
132b、132b’、132ba：包覆部；
140：透光盖板；
A1、A2：截面；
C1、C2：形状中心；
D’、D1、D2：间距；
E1：指纹端；
E2：感测端；
IB：光束；
P1、P2：位置；
RB：反射光束；
OB：手指；
S：侧表面；
S1：第一侧；
S2：第二侧；
W’、W1a、W2a、Wb1、Wb2：宽度
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，相同元件符号在图式和描述中用来表示相同或相似部分。
图1为本发明一实施例的指纹辨识装置的示意图。图2A为图1中光导板在指纹端的上视示意图。图2B为图1中光导板在感测端的上视示意图。图3为图1中光纤元件的纤核的外观示意图。
请参照图1，在本实施例中，指纹辨识装置100包括影像传感器110、光源120、光导板130与透光盖板140，其适于感测用户的指纹。于以下的段落中会详细地说明上述各元件與各元件之间的配置关系。
影像传感器110为可将光讯号转换成电讯号的电子元件，藉此将来自物体的影像光束转换成影像数据。于本实施例中，影像传感器110的种类例如是薄膜晶体管影像传感器或其他合适的影像传感器，本发明并不以此为限。影像传感器110设置于光导板130的第一侧S1(例如是下侧)。
光源120为可发出光束的光电元件。于本实施例中，光源120可为显示面板。于其他的实施例中，光源120亦可为发光二极管、有机发光二极管或其他合适的发光元件，本发明并不以此为限。光源120设置于光导板130的第二侧S2(例如是上侧)，且光源120设置于透光盖板140与光导板130之间。
光导板130为由多个光纤元件132所组成的板状元件，其中光束适于于光纤元件132内传递。请参照图1、图2A至图2B與图3，各光纤元件132 包括纤核132a与包覆部132b，其中包覆部132b包覆纤核132a，换言之，包覆部132b的内表面与纤核132a的外表面共形。纤核132a的折射率大于包覆部132b的折射率。各光纤元件132包括邻近于指纹的指纹端E1与邻近影像传感器110的感测端E2。请参照图2A与图2B，这些光纤元件132以阵列的方式排列，并与影像传感器110的各像素单元(未示出)对应。在指纹端E1与感测端E2中，两相邻的光纤元件132之间分别设有间距D1、D2，其中间距D1的大小例如是3微米，而间距D2的大小例如是4微米，应注意的是，上述的数值仅为举例，本发明并不以此为限。
纤核132a具有在指纹端E1的截面A1与在感测端E2的截面A2以及与截面A1、A2相连的侧表面S，其中侧表面S例如是倾斜的表面。纤核132a在指纹端E1的截面A1的形状中心C1对位于纤核132a在感测端E2的截面A2的形状中心C2。由图2A与图2B可看出：纤核132a在指纹端E1的截面A1面积大于纤核132a在感测端E2的截面A2面积。详细来说，请参照图2A，于本实施例中，纤核132a在指纹端E1的截面A1形状为正方形，且其宽度W1a例如是8微米，即纤核132a在指纹端E1的截面A1面积例如是64平方微米。请参照图2B，纤核132a在感测端E2的截面A2形状为正方形，且其宽度W2a例如是6微米，即纤核132a在感测端E2的截面A2面积例如是64平方微米。由图1与图3可看出：从指纹端E1往感测端E2的方向上，纤核132a的面积是递减的，纤核132a的形状为截头方锥体。应注意的是，上述的数值仅为举例，本发明并不以此为限。
另一方面，包覆部132b在指纹端E1的截面形状为中空的正方形，且其宽度Wb1例如是9微米，即包覆部132b在指纹端E1的截面积例如是17平方微米。包覆部132b在感测端E2的截面形状为中空的正方形，且其宽度Wb2例如是7微米，即包覆部132b在指纹端E1的截面积例如是13平方微米。由图1可看出：从指纹端E1往感测端E2的方向上，包覆部132b的面积是递减的。应注意的是，上述的数值仅为举例，本发明并不以此为限。
此外，于光导板130中，从指纹端E1至所述感测端E2的方向上，所述光纤元件132的长度L的范围落在4微米至10微米的范围内，本发明并不以此为限。
透光盖板140系为可使光束穿透的光学元件，其材料例如是玻璃，并提供上述元件保护功能。透光盖板140设置于光导板130的第二侧S2。
于以下的段落中会详细地说明本实施例的光学效果。
当用户的手指OB碰触透光盖板140时，光源120发出光束IB，光束IB穿透透光盖板140传递至手指OB上的指纹，指纹反射光束IB以形成反射光束RB，其中反射光束RB带有指纹的图像信息。反射光束RB再由指纹端E1进入光纤元件132的纤核132a，并在纤核132a内进行一至多次的全反射后，并由感测端E2离开纤核132a，以传递至影像传感器110。影像传感器110接收反射光束RB后将光讯号转换成电讯号，以感测指纹图案，并与***内部的存储的指纹影像比对，藉此达到辨识的功能。
图4A为一比较实施例的光纤元件在指纹端与感测端的上视示意图、剖面示意图以及相应的光学模拟图。图4B为本发明的一实施例的光纤元件在指纹端与感测端的上视示意图、剖面示意图以及相应的光学模拟图。
于此处具体说明比较实施例的光纤元件132’与本实施例的光纤元件132的差异，其主要差异在于：请参照图4A，光纤元件132’包括纤核132a’与包覆部132b’。纤核132a’的形状为长方柱体，包覆部132b’的形状为中空的长方柱体。纤核132a’在指纹端E1、感测端E2的截面形状皆为正方形，且其宽度W’例如皆为6微米。包覆部132b’在指纹端E1、感测端E2的宽度W”例如皆为7微米。包覆部132b’在指纹端E1、感测端E2的截面形状皆为中空的正方形，且其宽度W’例如皆为6微米。两相邻的光纤元件130’的间距D’例如为3微米。应注意的是，上述的数值仅为举例，本发明并不以此为限。
请先参照图4A，在比较实施例中，经计算可知其光效率约为5.5％，在位置P1的影像对比度为21.22％，而在位置P2的影像对比度为20.7％。请再参照图4B，在本实施例中，经计算可知其光效率约为8.71％，在位置P1的影像对比度为22.47％，而在位置P2的影像对比度为22％。由此可知，相较于比较实施例的纤核13a的设计，由于本实施例的光纤元件132的纤核132a截面积由指纹端E1至感测端E2递减，故由感测端E2出射的反射光束RB的光集中程度较高，因此影像传感器110感测到的指纹影像光效率良好，且指纹感测装置100具有较小的体积，符合现行电子装置微型化的趋势。
值得一提的是，若由非来自手指OB的杂散光束传递至纤核132a内时，由于纤核132a的侧表面S为倾斜的，杂散光束可藉由侧表面反射而由指纹端E1出射于光纤元件132，可降低杂散光的光串扰(optical cross talk)现象，因此影像传感器110感测到的指纹影像对比度良好,进而提升指纹分辨率。
图5A为本发明另一实施例的光导板在指纹端的上视局部示意图。图5B为图5A的光导板在感测端的上视局部示意图。图6为图5A中光纤元件的外观示意图。
请参照图5A至图5B、图6，上述图中的光導板130a類似於圖1、圖2A至圖2B及圖3的光導板130，其主要差異在於：光导板130a的纤核132aa的形状为截头圆锥体，包覆部132ba的形状为中空的截头圆锥体。
值得一提的是，只要纤核的截面积符合由指纹端E1至感测端E2递减的条件，都在本发明的范畴之内，本发明并不以此为限。
综上所述，在本发明的实施例的指纹感测装置中，由于光导板内光纤元件的纤核截面积由指纹端至感测端递减，故由感测端出射的光束的光集中程度较高，因此影像传感器感测到的指纹影像质量良好，且指纹感测装置具有较小的体积，符合现行电子装置微型化的趋势。此外，由于纤核的侧表面为斜面，当杂散光束入射于纤核时，杂散光束可在斜面进行多次反射后而由指纹端出射，避免位于感测端的影像传感器接收到杂散光束，因此指纹感测装置具有良好的影像对比度。
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. 一种指纹感测装置，适于感测用户的指纹，其特征在于，包括：
    影像传感器；
    光源；以及
    光导板，其中所述影像传感器设置于所述光导板的第一侧，所述光源设置于所述光导板的第二侧，所述第一侧相对于所述第二侧，其中所述光导板包括多个光纤元件，其中各所述光纤元件包括邻近于所述指纹的指纹端与邻近所述影像传感器的感测端，其中所述光纤元件的纤核的截面积由所述指纹端至所述感测端递减。
  2. 根据权利要求1所述的指纹感测装置，其特征在于，所述光纤元件的所述纤核形状为截头方锥体。
  3. 根据权利要求1所述的指纹感测装置，其特征在于，所述光纤元件的所述纤核形状为截头圆锥体。
  4. 根据权利要求1所述的指纹感测装置，其特征在于，从所述指纹端至所述感测端的方向上，所述光纤元件的长度的范围落在4微米至10微米的范围内。
  5. 根据权利要求1所述的指纹感测装置，其特征在于，其中所述纤核在所述指纹端的截面的形状中心对位于所述纤核在所述感测端的截面的形状中心。
  6. 根据权利要求1所述的指纹感测装置，其特征在于，所述影像传感器的种类为薄膜晶体管影像传感器。
  7. 根据权利要求1所述的指纹感测装置，其特征在于，所述光源包括显示面板。
  8. 根据权利要求1所述的指纹感测装置，其特征在于，所述光源用以发出光束，其中所述光束传递至所述指纹，所述指纹反射所述光束以形成反射光束，所述反射光束再由所述指纹端进入所述光纤元件，并由所述感测端离开所述光纤元件，以传递至所述影像传感器。
  9. 根据权利要求1所述的指纹感测装置，其特征在于，更包括透光盖板，设置于所述光源上方。
  10. 根据权利要求1所述的指纹感测装置，其特征在于，所述多个光纤 元件以阵列方式排列。
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