TWI762049B - Optical fingerprint identification module, display module and method for fingerprint identification - Google Patents

Optical fingerprint identification module, display module and method for fingerprint identification Download PDF

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TWI762049B
TWI762049B TW109141665A TW109141665A TWI762049B TW I762049 B TWI762049 B TW I762049B TW 109141665 A TW109141665 A TW 109141665A TW 109141665 A TW109141665 A TW 109141665A TW I762049 B TWI762049 B TW I762049B
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grating
photosensitive
signal light
units
finger
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TW109141665A
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TW202205148A (en
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王有庚
張靖愷
蔣新喜
陳家誠
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大陸商敦泰電子(深圳)有限公司
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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

Abstract

An optical fingerprint identification module, a display module and a method for fingerprint identification. The optical fingerprint identification module comprises a grating structure and a photosensitive chip; the grating structure includes a plurality of grating units, which include at least two gratings with different directions. The gratings are configured to perform phase modulation of signal light reflected by a finger, and the grating units are configured to obtain at least two signal light with different phase distribution. The photosensitive chip is configured to obtain depth information of a finger fingerprint according to the at least two signal light with different phase distribution, and to identify true or false of the finger according to the depth information. Since a real fingerprint of human body has the depth information, while a printed 2D fingerprint does not, the present disclosure can distinguish the real fingerprint of human body from the printed 2D fingerprint.

Description

光學指紋識別模組、顯示模組及指紋識別方法Optical fingerprint identification module, display module and fingerprint identification method

本發明涉及指紋識別技術領域，更具體地說，涉及一種光學指紋識別模組、顯示模組及指紋識別方法。The present invention relates to the technical field of fingerprint identification, and more particularly, to an optical fingerprint identification module, a display module and a fingerprint identification method.

光學指紋識別技術是通過採集手指反射或散射的光信號，來獲得指紋資訊，並將獲得的指紋資訊與存儲的指紋資訊進行對比，來實現指紋識別。但是，目前的光學指紋識別模組還無法區分人體真指紋和列印的2D指紋，如無法區分人體真指紋和指紋照片，導致現有的光學指紋識別模組的防偽性能和安全性較差。Optical fingerprint recognition technology obtains fingerprint information by collecting the light signal reflected or scattered by the finger, and compares the obtained fingerprint information with the stored fingerprint information to realize fingerprint recognition. However, the current optical fingerprint recognition module cannot distinguish between real human fingerprints and printed 2D fingerprints. For example, it is impossible to distinguish between real human fingerprints and fingerprint photos, resulting in poor anti-counterfeiting performance and security of the existing optical fingerprint recognition modules.

有鑑於此，本發明提供了一種光學指紋識別模組、顯示模組及其指紋識別方法，以提高指紋識別的安全性。為實現上述目的，本發明提供如下技術方案：In view of this, the present invention provides an optical fingerprint identification module, a display module and a fingerprint identification method thereof, so as to improve the security of fingerprint identification. To achieve the above object, the present invention provides the following technical solutions:

一種光學指紋識別模組，包括一光柵結構，該光柵結構包括多個光柵單元，該些光柵單元包括至少兩種方向不同的一光柵，該光柵用於對一手指反射的信號光進行相位調變，該些光柵單元用於獲得至少兩種不同相位分佈的信號光；以及一感光晶片，該感光晶片用於根據該至少兩種不同相位分佈的信號光，獲得該手指之指紋的一深度資訊，並根據該深度資訊識別該手指的真假。An optical fingerprint identification module includes a grating structure, the grating structure includes a plurality of grating units, the grating units include a grating with at least two different directions, the grating is used for phase modulation of signal light reflected by a finger , the grating units are used to obtain at least two signal lights with different phase distributions; and a photosensitive chip, which is used for obtaining a depth information of the fingerprint of the finger according to the at least two signal lights with different phase distributions, And identify the authenticity of the finger according to the depth information.

依據一些實施例，該光學指紋識別模組還包括一鏡頭，該鏡頭和該感光晶片在該光學指紋識別模組的入射光路上依次排；以及該光柵結構位於該感光晶片的感光面上，或者，該光柵結構位於該鏡頭和該感光晶片之間的任意位置。According to some embodiments, the optical fingerprint identification module further includes a lens, and the lens and the photosensitive chip are arranged in sequence on the incident light path of the optical fingerprint identification module; and the grating structure is located on the photosensitive surface of the photosensitive chip, or , the grating structure is located at any position between the lens and the photosensitive wafer.

依據一些實施例，該些光柵單元至少包括一第一光柵、一第二光柵、一第三光柵和一第四光柵，該第一光柵、該第二光柵、該第三光柵和該第四光柵的方向不同；該第一光柵用於對該手指反射的信號光進行相位調變，以獲得第一相位分佈的信號光；該第二光柵用於對該手指反射的信號光進行相位調變，以獲得第二相位分佈的信號光；該第三光柵用於對該手指反射的信號光進行相位調變，以獲得第三相位分佈的信號光；該第四光柵用於對該手指反射的信號光進行相位調變，以獲得第四相位分佈的信號光；以及該感光晶片用於根據該第一相位分佈的信號光、第二相位分佈的信號光、第三相位分佈的信號光和第四相位分佈的信號光，獲得該手指的指紋的深度資訊，並根據該深度資訊識別該手指的真假。According to some embodiments, the grating units include at least a first grating, a second grating, a third grating and a fourth grating, the first grating, the second grating, the third grating and the fourth grating The first grating is used for phase modulation of the signal light reflected by the finger to obtain signal light with a first phase distribution; the second grating is used for phase modulation of the signal light reflected by the finger, to obtain the signal light with the second phase distribution; the third grating is used for phase modulation of the signal light reflected by the finger to obtain the signal light with the third phase distribution; the fourth grating is used for the signal reflected by the finger The light is phase-modulated to obtain signal light of a fourth phase distribution; and the photosensitive wafer is used for the signal light of the first phase distribution, the signal light of the second phase distribution, the signal light of the third phase distribution, and the fourth phase distribution of the signal light. The signal light of the phase distribution obtains the depth information of the fingerprint of the finger, and identifies the authenticity of the finger according to the depth information.

依據一些實施例，該第一光柵的方向為-45°或135°，該第二光柵的方向為90°，該第三光柵的方向為0°，該第四光柵的方向為45°。According to some embodiments, the orientation of the first grating is -45° or 135°, the orientation of the second grating is 90°, the orientation of the third grating is 0°, and the orientation of the fourth grating is 45°.

依據一些實施例，該感光晶片包括多個感光單元，每個該感光單元都與一個該光柵對應設置。According to some embodiments, the photosensitive wafer includes a plurality of photosensitive units, and each of the photosensitive units is disposed corresponding to one of the gratings.

依據一些實施例，該感光晶片包括多個感光單元，部分該感光單元與該光柵對應設置。According to some embodiments, the photosensitive wafer includes a plurality of photosensitive units, and some of the photosensitive units are disposed corresponding to the grating.

依據一些實施例，該些光柵單元內的該些光柵與相鄰的該些感光單元對應設置；以及五個呈米字形排列的該些光柵單元構成一光柵單元組，相鄰的兩個該光柵單元組之間的最大間隔為16個該些感光單元。According to some embodiments, the gratings in the grating units are arranged corresponding to the adjacent photosensitive units; and five of the grating units arranged in the shape of a meter form a grating unit group, and two adjacent gratings The maximum interval between cell groups is 16 of these photosensitive cells.

依據一些實施例，該些光柵單元內的該些光柵與間隔排列的該些感光單元對應設置；以及相鄰的該光柵之間的間隔為1個該感光單元，四個相鄰的該些光柵單元構成一光柵單元組，相鄰的兩個該光柵單元組之間的最大間隔為17個該些感光單元。According to some embodiments, the gratings in the grating units are arranged correspondingly with the photosensitive units arranged at intervals; and the interval between the adjacent gratings is one photosensitive unit, and the adjacent gratings are four The units form a grating unit group, and the maximum interval between two adjacent grating unit groups is 17 of the photosensitive units.

依據一些實施例，該些光柵單元內的該些光柵與間隔排列的該些感光單元對應設置，相鄰的該光柵之間的間隔為2個該些感光單元，四個相鄰的該些光柵單元構成一光柵單元組，相鄰的兩個該光柵單元組之間的最大間隔為14個該些感光單元。According to some embodiments, the gratings in the grating units are arranged correspondingly with the photosensitive units arranged at intervals, and the interval between the adjacent gratings is two of the photosensitive units, and the interval between the adjacent gratings is four of the photosensitive units. The units form a grating unit group, and the maximum interval between two adjacent grating unit groups is 14 of the photosensitive units.

依據一些實施例，該光柵包括多個間隔設置的光柵柵體，該光柵柵體的材料包括金屬；並且，50nm≤w≤140nm，0.3≤d≤0.7，h≤240nm，其中，w為該光柵柵體的寬度，d為該光柵的占空比，h為該光柵的厚度。According to some embodiments, the grating includes a plurality of grating grids arranged at intervals, and the material of the grating grids includes metal; and, 50nm≤w≤140nm, 0.3≤d≤0.7, h≤240nm, wherein, w is the grating The width of the grating, d is the duty cycle of the grating, and h is the thickness of the grating.

一種顯示模組，包括如上任一項所述之光學指紋識別模組。A display module includes the optical fingerprint identification module described in any one of the above.

一種指紋識別方法，應用於如上任一項所述之光學指紋識別模組，該方法包括對一手指反射的信號光進行相位調變，並獲得至少兩種不同相位分佈的信號光；以及根據該至少兩種不同相位分佈的信號光，獲得該手指之指紋的一深度資訊，並根據該深度資訊識別該手指的真假。A fingerprint identification method, applied to the optical fingerprint identification module as described in any one of the above, the method comprising performing phase modulation on signal light reflected by a finger, and obtaining at least two signal lights with different phase distributions; and according to the At least two signal lights with different phase distributions are used to obtain a depth information of the fingerprint of the finger, and identify the authenticity of the finger according to the depth information.

與現有技術相比，依據一些實施例，本發明所提供的技術方案具有以下優點：Compared with the prior art, according to some embodiments, the technical solution provided by the present invention has the following advantages:

本發明於一些實施例所提供的光學指紋識別模組、顯示模組及其指紋識別方法，通過光柵對手指反射的信號光進行相位調製，通過至少兩種方向不同的光柵獲得至少兩種不同相位分佈的信號光，並根據所述至少兩種不同相位分佈的信號光，獲得所述手指指紋的深度資訊，根據所述深度資訊識別所述手指的真假。由於人體真實指紋具有深度資訊，而列印的2D指紋並不具有深度資訊，因此，依據一些實施例，本發明可以區分人體真實指紋和列印的2D指紋，提高了指紋識別的安全性。In the optical fingerprint identification module, display module and fingerprint identification method thereof provided by some embodiments of the present invention, the signal light reflected by the finger is phase-modulated through grating, and at least two different phases are obtained through at least two gratings with different directions. distributed signal light, and according to the at least two signal lights with different phase distributions, the depth information of the fingerprint of the finger is obtained, and the authenticity of the finger is identified according to the depth information. Since real human fingerprints have depth information, while printed 2D fingerprints do not have depth information, according to some embodiments, the present invention can distinguish between real human fingerprints and printed 2D fingerprints, thereby improving the security of fingerprint identification.

以上是本發明的核心思想，為使本發明的上述目的、特徵和優點能夠更加明顯易懂，下面將結合本發明實施例中的圖式，對本發明實施例中的技術方案進行清楚、完整地描述，顯然，所描述的實施例僅僅是本發明一部分實施例，而不是全部的實施例。基於本發明中的實施例，本領域普通技術人員在沒有做出創造性勞動前提下所獲得的所有其他實施例，都屬於本發明保護的範圍。The above is the core idea of the present invention. In order to make the above objects, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Description, it is obvious that the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

本發明實施例提供了一種光學指紋識別模組，如圖1所示，圖1為本發明一個實施例提供的光學指紋識別模組的部分剖面結構示意圖，該光學指紋識別模組包括光柵結構1和感光晶片2。其中，光柵結構1包括多個光柵單元10，如圖2所示，圖2為本發明一個實施例提供的光柵單元10的俯視結構示意圖，該光柵單元10包括至少兩種方向不同的光柵101和102。An embodiment of the present invention provides an optical fingerprint identification module. As shown in FIG. 1 , FIG. 1 is a partial cross-sectional structural schematic diagram of an optical fingerprint identification module provided by an embodiment of the present invention. The optical fingerprint identification module includes a grating structure 1 and photosensitive wafer 2. The grating structure 1 includes a plurality of grating units 10. As shown in FIG. 2, FIG. 2 is a schematic top-view structural diagram of a grating unit 10 provided by an embodiment of the present invention. The grating unit 10 includes at least two gratings 101 and 102.

其中，光柵101用於對手指反射的信號光進行相位調變，光柵單元10用於獲得至少兩種不同相位分佈的信號光，感光晶片2用於根據至少兩種不同相位分佈的信號光，獲得手指指紋的深度資訊，並根據深度資訊識別手指的真假。The grating 101 is used for phase modulation of the signal light reflected by the finger, the grating unit 10 is used for obtaining at least two signal lights with different phase distributions, and the photosensitive wafer 2 is used for obtaining signal lights with at least two different phase distributions. Fingerprint depth information, and identify the authenticity of the finger according to the depth information.

如光柵101對手指反射的信號光進行相位調變後，獲得第一相位分佈的信號光S1，並將第一相位分佈的信號光S1傳輸至感光晶片2，光柵102對手指反射的信號光進行相位調變後，獲得第二相位分佈的信號光S2，並將第二相位分佈的信號光S2傳輸至感光晶片2。感光晶片2的感光面接收第一相位分佈的信號光S1和第二相位分佈的信號光S2，感光晶片2內部的處理元件通過演算法將第一相位分佈的信號光S1生成的圖像和第二相位分佈的信號光S2生成的圖像合併，獲得手指指紋的立體圖像，該立體圖像包含指紋的深度資訊，從而可以根據深度資訊識別手指的真假。For example, after the grating 101 performs phase modulation on the signal light reflected by the finger, the signal light S1 with the first phase distribution is obtained, and the signal light S1 with the first phase distribution is transmitted to the photosensitive wafer 2, and the grating 102 modulates the signal light reflected by the finger. After the phase modulation, the signal light S2 with the second phase distribution is obtained, and the signal light S2 with the second phase distribution is transmitted to the photosensitive wafer 2 . The photosensitive surface of the photosensitive wafer 2 receives the signal light S1 of the first phase distribution and the signal light S2 of the second phase distribution. The images generated by the signal light S2 of the two-phase distribution are combined to obtain a three-dimensional image of the fingerprint of the finger. The three-dimensional image contains the depth information of the fingerprint, so that the authenticity of the finger can be identified according to the depth information.

由於方向不同的光柵101出射的信號光的相位分佈具有差異，因此，感光晶片2通過演算法處理將相位分佈具有差異的信號光合併後可以得到具有不同深度資訊的圖像。由於人體真指紋具有深度資訊，而列印的2D指紋並不具有深度資訊，因此，感光晶片2可根據深度資訊區分人體真指紋和列印的2D指紋，從而提高了指紋識別的安全性。Since the phase distributions of the signal lights emitted from the gratings 101 with different directions are different, the photosensitive wafer 2 can obtain images with different depth information after combining the signal lights with different phase distributions through algorithm processing. Since the real human fingerprint has depth information, while the printed 2D fingerprint does not have depth information, the photosensitive chip 2 can distinguish between the real human fingerprint and the printed 2D fingerprint according to the depth information, thereby improving the security of fingerprint identification.

本發明的一些實施例中，如圖1和圖2所示，光柵結構1包括透明襯底11以及設置在透明襯底11上且間隔設置的多個光柵柵體1010，可選地，光柵柵體1010的材料包括金屬，如鋁、金、銀、銅、鉻等中的一種或多種。也就是說，光柵柵體1010可以是單層金屬，也可以是多層金屬或是金屬與氧化物的混合堆疊。其中，光柵柵體1010之間的間隔1011可以是空氣，也可以是二氧化矽等透明材料。In some embodiments of the present invention, as shown in FIG. 1 and FIG. 2 , the grating structure 1 includes a transparent substrate 11 and a plurality of grating grid bodies 1010 arranged on the transparent substrate 11 and spaced apart. The material of the body 1010 includes metals such as one or more of aluminum, gold, silver, copper, chromium, and the like. That is, the grating body 1010 may be a single-layer metal, a multi-layer metal, or a mixed stack of metals and oxides. The space 1011 between the grating grids 1010 may be air or a transparent material such as silicon dioxide.

本發明實施例中，光柵101的方向為-90°≤θ≤90°，其中，θ指光柵柵體1010的延伸方向與X軸方向的夾角。並且，50nm≤w≤140nm，0.3≤d≤0.7，h≤240nm，其中，w1為光柵柵體1010的寬度，d為光柵101的占空比，h為光柵1010的厚度，d= w1/(w1+w2)，w2為光柵柵體1010之間的間隔1011的寬度。In the embodiment of the present invention, the direction of the grating 101 is -90°≤θ≤90°, where θ refers to the angle between the extending direction of the grating body 1010 and the X-axis direction. And, 50nm≤w≤140nm, 0.3≤d≤0.7, h≤240nm, wherein, w1 is the width of the grating body 1010, d is the duty cycle of the grating 101, h is the thickness of the grating 1010, d= w1/( w1+w2), w2 is the width of the interval 1011 between the grating grids 1010 .

可選地，本發明的一些實施例中，光柵結構1可以位於感光晶片2的感光面上，當然，本發明並不僅限於此，在其他的一些實施例中，光柵結構1還可以位於感光晶片2入光側的任意位置，只要保證入射到感光晶片2上的信號光是經過光柵結構1中的光柵相位調變後的光即可。Optionally, in some embodiments of the present invention, the grating structure 1 may be located on the photosensitive surface of the photosensitive wafer 2. Of course, the present invention is not limited to this. In other embodiments, the grating structure 1 may also be located on the photosensitive wafer 2. 2 Any position on the light-incident side, as long as it is ensured that the signal light incident on the photosensitive wafer 2 is the light after the phase modulation of the grating in the grating structure 1 .

本發明的一些實施例中，如圖3所示，圖3為本發明一個實施例提供的光學指紋識別模組的部分剖面結構示意圖，光學指紋識別模組還包括鏡頭3，鏡頭3和感光晶片2在光學指紋識別模組的入射光路上依次排布，當然，在另一些實施例中，光學指紋識別模組還包括位於鏡頭3和感光晶片2之間的濾光片等，在此不再贅述。其中，光柵結構1位於鏡頭3和感光晶片2之間的任意位置。當然，本發明並不僅限於此，在一些實施例中，光柵結構1還可以位於鏡頭3的入光側。In some embodiments of the present invention, as shown in FIG. 3, FIG. 3 is a partial cross-sectional structural schematic diagram of an optical fingerprint identification module provided by an embodiment of the present invention. The optical fingerprint identification module further includes a lens 3, a lens 3 and a photosensitive chip 2 are arranged in sequence on the incident light path of the optical fingerprint identification module. Of course, in some other embodiments, the optical fingerprint identification module also includes a filter located between the lens 3 and the photosensitive chip 2, and so on. Repeat. Wherein, the grating structure 1 is located at any position between the lens 3 and the photosensitive wafer 2 . Of course, the present invention is not limited to this, and in some embodiments, the grating structure 1 may also be located on the light incident side of the lens 3 .

本發明實施例中，光柵單元10可以包括兩種方向不同的光柵101，也可以包括四種方向不同的光柵101，也可以包括八種方向不同的光柵101在此不再一一贅述。本發明的一些實施例中，如圖4所示，圖4為本發明一個實施例提供的光柵單元的俯視結構示意圖，光柵單元10至少包括第一光柵103、第二光柵104、第三光柵105和第四光柵106，第一光柵103、第二光柵104、第三光柵105和第四光柵106的方向不同。In this embodiment of the present invention, the grating unit 10 may include two kinds of gratings 101 with different directions, may also include four kinds of gratings 101 with different directions, or may include eight kinds of gratings 101 with different directions, which will not be repeated here. In some embodiments of the present invention, as shown in FIG. 4 , which is a schematic top-view structure of a grating unit provided by an embodiment of the present invention, the grating unit 10 at least includes a first grating 103 , a second grating 104 , and a third grating 105 The directions of the first grating 103 , the second grating 104 , the third grating 105 and the fourth grating 106 are different from those of the fourth grating 106 .

可選地，第一光柵103的方向為-45°，即第一光柵103的光柵柵體1010的延伸方向與X軸方向的夾角θ 1 =-45°，第二光柵104的方向為90°，即第二光柵104的光柵柵體1010的延伸方向與X軸方向的夾角θ 2 =90°，第三光柵105的方向為0°，即第三光柵105的光柵柵體1010的延伸方向與X軸方向的夾角θ 3 =0°，第四光柵106的方向為45°，即第四光柵106的光柵柵體1010的延伸方向與X軸方向的夾角θ 4 =45°。當然，本發明並不僅限於此，在其他的一些實施例中，可以根據實際需要對每個光柵的方向進行限定。 Optionally, the direction of the first grating 103 is -45°, that is, the angle θ 1 = -45° between the extending direction of the grating body 1010 of the first grating 103 and the X-axis direction, and the direction of the second grating 104 is 90° , that is, the included angle θ 2 = 90° between the extending direction of the grating body 1010 of the second grating 104 and the X-axis direction, and the direction of the third grating 105 is 0°, that is, the extending direction of the grating body 1010 of the third grating 105 is the same as The included angle θ 3 = 0° in the X-axis direction, and the direction of the fourth grating 106 is 45°, that is, the included angle θ 4 = 45° between the extending direction of the grating body 1010 of the fourth grating 106 and the X-axis direction. Of course, the present invention is not limited to this, and in other embodiments, the direction of each grating may be limited according to actual needs.

本發明的一些實施例中，第一光柵103用於對手指反射的信號光進行相位調變，以獲得第一相位分佈的信號光S1；第二光柵104用於對手指反射的信號光進行相位調變，以獲得第二相位分佈的信號光S2；第三光柵105用於對手指反射的信號光進行相位調變，以獲得第三相位分佈的信號光；第四光柵106用於對手指反射的信號光進行相位調變，以獲得第四相位分佈的信號光；感光晶片2用於根據第一相位分佈的信號光S1、第二相位分佈的信號光S2、第三相位分佈的信號光和第四相位分佈的信號光，獲得手指的指紋的深度資訊，並根據深度資訊識別手指的真假。In some embodiments of the present invention, the first grating 103 is used to phase modulate the signal light reflected by the finger to obtain the signal light S1 with the first phase distribution; the second grating 104 is used to phase the signal light reflected by the finger modulation to obtain the signal light S2 of the second phase distribution; the third grating 105 is used to perform phase modulation on the signal light reflected by the finger to obtain the signal light of the third phase distribution; the fourth grating 106 is used to reflect the finger The signal light is phase-modulated to obtain the signal light of the fourth phase distribution; the photosensitive wafer 2 is used for the signal light S1 of the first phase distribution, the signal light S2 of the second phase distribution, the signal light of the third phase distribution and the The signal light of the fourth phase distribution obtains the depth information of the fingerprint of the finger, and identifies the authenticity of the finger according to the depth information.

本發明的一些實施例中，感光晶片2包括多個感光單元20，每個感光單元20都與一個光柵101對應設置，其中一些感光單元20與一個方向的光柵101對應設置，一些感光單元20與另一個方向的光柵101對應設置。當然，本發明並不僅限於此，在另一些實施例中，為了節省成本，減少光柵材料的使用，在保證能夠獲得深度資訊的基礎上，令部分感光單元20與光柵101對應設置，令另一部分感光單元20不與光柵101對應設置。In some embodiments of the present invention, the photosensitive wafer 2 includes a plurality of photosensitive units 20, each photosensitive unit 20 is arranged corresponding to a grating 101, some of the photosensitive units 20 are arranged corresponding to the grating 101 in one direction, and some photosensitive units 20 are arranged corresponding to the grating 101 in one direction. The grating 101 in the other direction is correspondingly arranged. Of course, the present invention is not limited to this. In other embodiments, in order to save costs and reduce the use of grating materials, on the basis of ensuring that depth information can be obtained, some photosensitive units 20 are set corresponding to the grating 101, and another part is set correspondingly to the grating 101. The photosensitive unit 20 is not provided corresponding to the grating 101 .

以光柵單元10包括4個光柵101，即第一光柵103、第二光柵104、第三光柵105和第四光柵106為例進行說明，本發明的一些實施例中，光柵單元10內的多個光柵101與相鄰的多個感光單元20對應設置，如圖5所示，圖5為本發明一個實施例提供的光柵和感光單元的俯視結構示意圖，第一光柵103、第二光柵104、第三光柵105和第四光柵106相鄰設置，且與4個感光單元20對應設置，並且，五個呈米字形排列的光柵單元10構成光柵單元組G，相鄰的兩個光柵單元組G之間的最大間隔D1為16個感光單元20，相鄰兩個光柵單元10之間的最大間隔D2為4個感光單元20。Taking the grating unit 10 including four gratings 101 , namely the first grating 103 , the second grating 104 , the third grating 105 and the fourth grating 106 as an example, in some embodiments of the present invention, multiple gratings in the grating unit 10 The grating 101 is arranged correspondingly to a plurality of adjacent photosensitive units 20. As shown in FIG. 5, FIG. 5 is a schematic top-view structure diagram of a grating and a photosensitive unit provided by an embodiment of the present invention. The first grating 103, the second grating 104, the The third grating 105 and the fourth grating 106 are arranged adjacent to each other, and are arranged corresponding to the four photosensitive units 20 , and the five grating units 10 arranged in the shape of a meter form the grating unit group G, and the two adjacent grating unit groups G are between The maximum interval D1 between them is 16 photosensitive units 20 , and the maximum interval D2 between two adjacent grating units 10 is 4 photosensitive units 20 .

本發明的另一些實施例中，光柵單元10內的多個光柵101與間隔排列的多個感光單元20對應設置，相鄰的光柵101之間的間隔1011為1個感光單元20，如圖6所示，圖6為本發明一個實施例提供的光柵和感光單元的俯視結構示意圖，第一光柵103、第二光柵104、第三光柵105和第四光柵106呈矩陣排列，第一光柵103、第二光柵104、第三光柵105和第四光柵106之間的間隔1011為1個感光單元20，並且，四個相鄰的光柵單元10構成光柵單元組G，相鄰的兩個光柵單元組G之間的最大間隔D1為17個感光單元20。In other embodiments of the present invention, the plurality of gratings 101 in the grating unit 10 are arranged corresponding to the plurality of photosensitive units 20 arranged at intervals, and the interval 1011 between adjacent gratings 101 is one photosensitive unit 20, as shown in FIG. 6 . 6 is a schematic top-view structural diagram of a grating and a photosensitive unit provided by an embodiment of the present invention. The first grating 103, the second grating 104, the third grating 105, and the fourth grating 106 are arranged in a matrix. The first grating 103, The interval 1011 between the second grating 104, the third grating 105 and the fourth grating 106 is one photosensitive unit 20, and four adjacent grating units 10 constitute a grating unit group G, and two adjacent grating unit groups The maximum interval D1 between G is 17 photosensitive units 20 .

本發明的另一些實施例中，光柵單元10內的多個光柵101與間隔排列的多個感光單元20對應設置，相鄰光柵101之間的間隔1011為2個感光單元20，如圖7所示，圖7為本發明一個實施例提供的光柵和感光單元的俯視結構示意圖，第一光柵103、第二光柵104、第三光柵105和第四光柵106之間的間隔1011為2個感光單元20，四個相鄰的光柵單元10構成光柵單元組G，相鄰的兩個光柵單元組G之間的最大間隔D1為14個感光單元20。In other embodiments of the present invention, the plurality of gratings 101 in the grating unit 10 are arranged corresponding to the plurality of photosensitive units 20 arranged at intervals, and the interval 1011 between adjacent gratings 101 is two photosensitive units 20, as shown in FIG. 7 . 7 is a schematic top view of the structure of a grating and a photosensitive unit provided by an embodiment of the present invention, the interval 1011 between the first grating 103, the second grating 104, the third grating 105, and the fourth grating 106 is two photosensitive units 20. Four adjacent grating units 10 form a grating unit group G, and the maximum interval D1 between two adjacent grating unit groups G is 14 photosensitive units 20 .

當然，本發明並不僅限於此，在另一些實施例中，可以根據實際情況對光柵101的排列情況進行限定。Of course, the present invention is not limited to this, and in other embodiments, the arrangement of the gratings 101 may be limited according to the actual situation.

本發明實施例還提供了一種顯示模組，包括如上任一實施例提供的光學指紋識別模組。如圖8所示，圖8為本發明一個實施例提供的顯示模組的剖面結構示意圖，顯示模組包括顯示面板A和位於顯示面板A下方的光學指紋識別模組B，其中，顯示面板A發出的光照亮指紋C，通過光學指紋識別模組B接收到指紋C反射或散射的信號光，光學指紋識別模組B中的光柵結構用於將信號光轉換為至少兩種不同相位分佈的信號光，光學指紋識別模組B中的感光晶片2根據至少兩種不同相位分佈的信號光，獲得手指指紋的深度資訊，並根據深度資訊識別手指的真假。An embodiment of the present invention further provides a display module, including the optical fingerprint identification module provided in any of the above embodiments. As shown in FIG. 8 , FIG. 8 is a schematic cross-sectional structure diagram of a display module provided by an embodiment of the present invention. The display module includes a display panel A and an optical fingerprint recognition module B located below the display panel A, wherein the display panel A The emitted light illuminates the fingerprint C, and the signal light reflected or scattered by the fingerprint C is received through the optical fingerprint identification module B. The grating structure in the optical fingerprint identification module B is used to convert the signal light into at least two different phase distributions. Signal light, the photosensitive chip 2 in the optical fingerprint recognition module B obtains the depth information of the finger fingerprint according to at least two signal lights with different phase distributions, and identifies the authenticity of the finger according to the depth information.

本發明實施例還提供了一種指紋識別方法，應用於如上任一實施例提供的光學指紋識別模組，如圖9所示，方法包括： 步驟S101：對手指反射的信號光進行相位調變，並獲得至少兩種不同相位分佈的信號光； 步驟S102：根據至少兩種不同相位分佈的信號光，獲得手指指紋的深度資訊，並根據深度資訊識別手指的真假。 An embodiment of the present invention also provides a fingerprint identification method, which is applied to the optical fingerprint identification module provided in any of the above embodiments. As shown in FIG. 9 , the method includes: Step S101: Perform phase modulation on the signal light reflected by the finger, and obtain at least two signal lights with different phase distributions; Step S102: Obtain depth information of the fingerprint of the finger according to at least two signal lights with different phase distributions, and identify the authenticity of the finger according to the depth information.

參考圖1，光柵結構1中的光柵101對手指反射的信號光進行相位調變，光柵單元10獲得至少兩種不同相位分佈的信號光，感光晶片2根據至少兩種不同相位分佈的信號光，獲得手指指紋的深度資訊，並根據深度資訊識別手指的真假。Referring to FIG. 1 , the grating 101 in the grating structure 1 performs phase modulation on the signal light reflected by the finger, the grating unit 10 obtains at least two signal lights with different phase distributions, and the photosensitive wafer 2 according to the at least two different phase distributions of the signal light, Obtain the depth information of the fingerprint of the finger, and identify the authenticity of the finger according to the depth information.

可選地，光柵101對手指反射的信號光進行相位調變後，獲得第一相位分佈的信號光S1，並將第一相位分佈的信號光S1傳輸至感光晶片2，光柵102對手指反射的信號光進行相位調變後，獲得第二相位分佈的信號光S2，並將第二相位分佈的信號光S2傳輸至感光晶片2。感光晶片2的感光面接收第一相位分佈的信號光S1和第二相位分佈的信號光S2，感光晶片2內部的處理元件通過演算法將第一相位分佈的信號光S1生成的圖像和第二相位分佈的信號光S2生成的圖像合併，獲得手指指紋的立體圖像，該立體圖像包含指紋的深度資訊，從而可以根據深度資訊識別手指的真假。Optionally, after the grating 101 performs phase modulation on the signal light reflected by the finger, the signal light S1 with the first phase distribution is obtained, and the signal light S1 with the first phase distribution is transmitted to the photosensitive wafer 2. After the signal light is subjected to phase modulation, the signal light S2 with the second phase distribution is obtained, and the signal light S2 with the second phase distribution is transmitted to the photosensitive wafer 2 . The photosensitive surface of the photosensitive wafer 2 receives the signal light S1 of the first phase distribution and the signal light S2 of the second phase distribution. The images generated by the signal light S2 of the two-phase distribution are combined to obtain a three-dimensional image of the fingerprint of the finger. The three-dimensional image contains the depth information of the fingerprint, so that the authenticity of the finger can be identified according to the depth information.

由於方向不同的光柵101出射的信號光的相位分佈具有差異，因此，感光晶片2通過演算法處理將相位分佈具有差異的信號光合併後可以得到具有不同深度資訊的圖像。由於人體真指紋具有深度資訊，而列印的2D指紋並不具有深度資訊，因此，感光晶片2可根據深度資訊區分人體真指紋和列印的2D指紋，從而提高了指紋識別的安全性。Since the phase distributions of the signal lights emitted from the gratings 101 with different directions are different, the photosensitive wafer 2 can obtain images with different depth information after combining the signal lights with different phase distributions through algorithm processing. Since the real human fingerprint has depth information, while the printed 2D fingerprint does not have depth information, the photosensitive chip 2 can distinguish between the real human fingerprint and the printed 2D fingerprint according to the depth information, thereby improving the security of fingerprint identification.

本說明書中各個實施例採用遞進的方式描述，每個實施例重點說明的都是與其他實施例的不同之處，各個實施例之間相同相似部分互相參見即可。對於實施例公開的裝置而言，由於其與實施例公開的方法相對應，所以描述的比較簡單，相關之處參見方法部分說明即可。The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

對所公開的實施例的上述說明，使本領域專業技術人員能夠實現或使用本發明。對這些實施例的多種修改對本領域的專業技術人員來說將是顯而易見的，本文中所定義的一般原理可以在不脫離本發明的精神或範圍的情況下，在其它實施例中實現。因此，本發明將不會被限制于本文所示的這些實施例，而是要符合與本文所公開的原理和新穎特點相一致的最寬的範圍。The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

1:光柵結構 10:光柵單元 101:光柵 1010:光柵柵體 1011:間隔 102:光柵 103:第一光柵 104:第二光柵 105:第三光柵 106:第四光柵 11:透明襯底 2:感光晶片 20:感光單元 3:鏡頭 S1:第一相位分佈的信號光 S2:第二相位分佈的信號光 A:顯示面板 B:光學指紋識別模組 C:指紋 G:光柵單元組 D1:相鄰的兩個光柵單元組之間的最大間隔 D2:相鄰兩個光柵單元之間的最大間隔 h:光柵的厚度 w1:光柵柵體的寬度 w2:光柵柵體之間的間隔的寬度 S101~S102:步驟 1: Grating structure 10: raster unit 101: Grating 1010: Raster Grid 1011: Interval 102: Grating 103: First grating 104: Second grating 105: Third grating 106: Fourth grating 11: Transparent substrate 2: Photosensitive chip 20: Photosensitive unit 3: Lens S1: Signal light of the first phase distribution S2: Signal light of the second phase distribution A: Display panel B: Optical fingerprint recognition module C: Fingerprint G: grating unit group D1: The maximum interval between two adjacent grating unit groups D2: Maximum spacing between two adjacent grating units h: thickness of grating w1: the width of the grating grid w2: the width of the space between the grating grids S101~S102: Steps

為了更清楚地說明本發明實施例或現有技術中的技術方案，下面將對實施例或現有技術描述中所需要使用的圖式作簡單地介紹，顯而易見地，下面描述中的圖式僅僅是本發明的實施例，對於本領域普通技術人員來講，在不付出創造性勞動的前提下，還可以根據提供的圖式獲得其他的圖式。 圖1為本發明一個實施例提供的光學指紋識別模組的部分剖面結構示意圖； 圖2為本發明一個實施例提供的光柵單元的俯視結構示意圖； 圖3為本發明一個實施例提供的光學指紋識別模組的部分剖面結構示意圖； 圖4為本發明一個實施例提供的光柵單元的俯視結構示意圖； 圖5為本發明一個實施例提供的光柵和感光單元的俯視結構示意圖； 圖6為本發明一個實施例提供的光柵和感光單元的俯視結構示意圖； 圖7為本發明一個實施例提供的光柵和感光單元的俯視結構示意圖； 圖8為本發明一個實施例提供的顯示模組的剖面結構示意圖；以及 圖9為本發明一個實施例提供的指紋識別方法的流程圖。 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the For the embodiments of the invention, for those of ordinary skill in the art, other drawings can also be obtained according to the drawings provided on the premise of no creative effort. 1 is a partial cross-sectional structural schematic diagram of an optical fingerprint identification module provided by an embodiment of the present invention; FIG. 2 is a schematic top-view structural diagram of a grating unit according to an embodiment of the present invention; 3 is a partial cross-sectional structural schematic diagram of an optical fingerprint identification module provided by an embodiment of the present invention; FIG. 4 is a schematic top-view structural diagram of a grating unit according to an embodiment of the present invention; 5 is a schematic top-view structural diagram of a grating and a photosensitive unit provided by an embodiment of the present invention; 6 is a schematic top-view structural diagram of a grating and a photosensitive unit provided by an embodiment of the present invention; 7 is a schematic top-view structural diagram of a grating and a photosensitive unit provided by an embodiment of the present invention; 8 is a schematic cross-sectional structure diagram of a display module provided by an embodiment of the present invention; and FIG. 9 is a flowchart of a fingerprint identification method provided by an embodiment of the present invention.

1:光柵結構 10:光柵單元 101:光柵 1010:光柵柵體 102:光柵 11:透明襯底 2:感光晶片 S1:第一相位分佈的信號光 S2:第二相位分佈的信號光 h:光柵的厚度 1: Grating structure 10: raster unit 101: Grating 1010: Raster Grid 102: Grating 11: Transparent substrate 2: Photosensitive chip S1: Signal light of the first phase distribution S2: Signal light of the second phase distribution h: thickness of grating

Claims (12)

一種光學指紋識別模組，包括： 一光柵結構，該光柵結構包括多個光柵單元，該些光柵單元包括至少兩種方向不同的一光柵，該光柵用於對一手指反射的信號光進行相位調變，該些光柵單元用於獲得至少兩種不同相位分佈的信號光；以及 一感光晶片，該感光晶片用於根據該至少兩種不同相位分佈的信號光，獲得該手指之指紋的一深度資訊，並根據該深度資訊識別該手指的真假。 An optical fingerprint identification module, comprising: A grating structure, the grating structure includes a plurality of grating units, the grating units include a grating with at least two different directions, the grating is used to perform phase modulation on the signal light reflected by a finger, and the grating units are used to obtain at least two different phase distributions of signal light; and A photosensitive chip, which is used for obtaining a depth information of the fingerprint of the finger according to the at least two signal lights with different phase distributions, and identifying the authenticity of the finger according to the depth information. 如請求項1所述之光學指紋識別模組，其中： 該光學指紋識別模組還包括一鏡頭，該鏡頭和該感光晶片在該光學指紋識別模組的入射光路上依次排布；以及 該光柵結構位於該感光晶片的感光面上，或者，該光柵結構位於該鏡頭和該感光晶片之間的任意位置。 The optical fingerprint recognition module as claimed in claim 1, wherein: The optical fingerprint identification module further includes a lens, and the lens and the photosensitive chip are sequentially arranged on the incident light path of the optical fingerprint identification module; and The grating structure is located on the photosensitive surface of the photosensitive wafer, or the grating structure is located at any position between the lens and the photosensitive wafer. 如請求項1所述之光學指紋識別模組，其中： 該些光柵單元至少包括一第一光柵、一第二光柵、一第三光柵和一第四光柵，該第一光柵、該第二光柵、該第三光柵和該第四光柵的方向不同； 該第一光柵用於對該手指反射的信號光進行相位調變，以獲得第一相位分佈的信號光； 該第二光柵用於對該手指反射的信號光進行相位調變，以獲得第二相位分佈的信號光； 該第三光柵用於對該手指反射的信號光進行相位調變，以獲得第三相位分佈的信號光； 該第四光柵用於對該手指反射的信號光進行相位調變，以獲得第四相位分佈的信號光；以及 該感光晶片用於根據該第一相位分佈的信號光、第二相位分佈的信號光、第三相位分佈的信號光和第四相位分佈的信號光，獲得該手指的指紋的深度資訊，並根據該深度資訊識別該手指的真假。 The optical fingerprint recognition module as claimed in claim 1, wherein: The grating units at least include a first grating, a second grating, a third grating and a fourth grating, and the directions of the first grating, the second grating, the third grating and the fourth grating are different; The first grating is used to perform phase modulation on the signal light reflected by the finger to obtain signal light with a first phase distribution; The second grating is used to perform phase modulation on the signal light reflected by the finger to obtain signal light with a second phase distribution; The third grating is used to perform phase modulation on the signal light reflected by the finger to obtain signal light with a third phase distribution; The fourth grating is used to perform phase modulation on the signal light reflected by the finger to obtain signal light with a fourth phase distribution; and The photosensitive wafer is used to obtain the depth information of the fingerprint of the finger according to the signal light of the first phase distribution, the signal light of the second phase distribution, the signal light of the third phase distribution and the signal light of the fourth phase distribution, and according to The depth information identifies the authenticity of the finger. 如請求項3所述之光學指紋識別模組，其中，該第一光柵的方向為-45°或135°，該第二光柵的方向為90°，該第三光柵的方向為0°，該第四光柵的方向為45°。The optical fingerprint recognition module of claim 3, wherein the direction of the first grating is -45° or 135°, the direction of the second grating is 90°, the direction of the third grating is 0°, and the direction of the third grating is 0°. The direction of the fourth grating is 45°. 如請求項1所述之光學指紋識別模組，其中，該感光晶片包括多個感光單元，每個該感光單元都與一個該光柵對應設置。The optical fingerprint identification module according to claim 1, wherein the photosensitive wafer includes a plurality of photosensitive units, and each of the photosensitive units is disposed corresponding to one of the gratings. 如請求項1所述之光學指紋識別模組，其中，該感光晶片包括多個感光單元，部分該感光單元與該光柵對應設置。The optical fingerprint identification module of claim 1, wherein the photosensitive wafer includes a plurality of photosensitive units, and some of the photosensitive units are arranged corresponding to the grating. 如請求項6所述之光學指紋識別模組，其中： 該些光柵單元內的該些光柵與相鄰的該些感光單元對應設置；以及 五個呈米字形排列的該些光柵單元構成一光柵單元組，相鄰的兩個該光柵單元組之間的最大間隔為16個該些感光單元。 The optical fingerprint recognition module as claimed in claim 6, wherein: The gratings in the grating units are arranged corresponding to the adjacent photosensitive units; and The five grating units arranged in the shape of a meter form a grating unit group, and the maximum interval between two adjacent grating unit groups is 16 of the light-sensing units. 如請求項6所述之光學指紋識別模組，其中： 該些光柵單元內的該些光柵與間隔排列的該些感光單元對應設置；以及 相鄰的該光柵之間的間隔為1個該感光單元，四個相鄰的該些光柵單元構成一光柵單元組，相鄰的兩個該光柵單元組之間的最大間隔為17個該些感光單元。 The optical fingerprint recognition module as claimed in claim 6, wherein: The gratings in the grating units are arranged corresponding to the photosensitive units arranged at intervals; and The interval between adjacent gratings is one photosensitive unit, four adjacent grating units form a grating unit group, and the maximum interval between two adjacent grating unit groups is 17 of these photosensitive unit. 如請求項6所述之光學指紋識別模組，其中，該些光柵單元內的該些光柵與間隔排列的該些感光單元對應設置，相鄰的該光柵之間的間隔為2個該些感光單元，四個相鄰的該些光柵單元構成一光柵單元組，相鄰的兩個該光柵單元組之間的最大間隔為14個該些感光單元。The optical fingerprint recognition module according to claim 6, wherein the gratings in the grating units are arranged corresponding to the photosensitive units arranged at intervals, and the interval between the adjacent gratings is two of the photosensitive units unit, four adjacent grating units constitute a grating unit group, and the maximum interval between two adjacent grating unit groups is 14 these photosensitive units. 如請求項1所述之光學指紋識別模組，其中： 該光柵包括多個間隔設置的光柵柵體，該光柵柵體的材料包括金屬；並且，50nm≤w≤140nm，0.3≤d≤0.7，h≤240nm，其中，w為該光柵柵體的寬度，d為該光柵的占空比，h為該光柵的厚度。 The optical fingerprint recognition module as claimed in claim 1, wherein: The grating includes a plurality of grating grid bodies arranged at intervals, and the material of the grating grid body includes metal; and, 50nm≤w≤140nm, 0.3≤d≤0.7, h≤240nm, wherein, w is the width of the grating grid body, d is the duty cycle of the grating, and h is the thickness of the grating. 一種顯示模組，包括請求項1至10任一項所述之光學指紋識別模組。A display module, comprising the optical fingerprint identification module according to any one of claims 1 to 10. 一種指紋識別方法，應用於請求項1至10任一項所述之光學指紋識別模組，該方法包括： 對一手指反射的信號光進行相位調變，並獲得至少兩種不同相位分佈的信號光；以及 根據該至少兩種不同相位分佈的信號光，獲得該手指之指紋的一深度資訊，並根據該深度資訊識別該手指的真假。 A fingerprint identification method, applied to the optical fingerprint identification module described in any one of claim 1 to 10, the method comprising: Phase modulation is performed on the signal light reflected by a finger, and at least two signal lights with different phase distributions are obtained; and According to the at least two signal lights with different phase distributions, a depth information of the fingerprint of the finger is obtained, and the authenticity of the finger is identified according to the depth information.
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