WO2017036072A1 - 指纹识别装置及指纹识别系统 - Google Patents
指纹识别装置及指纹识别系统 Download PDFInfo
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- WO2017036072A1 WO2017036072A1 PCT/CN2016/071620 CN2016071620W WO2017036072A1 WO 2017036072 A1 WO2017036072 A1 WO 2017036072A1 CN 2016071620 W CN2016071620 W CN 2016071620W WO 2017036072 A1 WO2017036072 A1 WO 2017036072A1
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- transparent cover
- light
- angle
- refractive index
- photosensor
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06V40/1329—Protecting the fingerprint sensor against damage caused by the finger
Definitions
- Embodiments of the present invention relate to a fingerprint identification device and a fingerprint recognition system.
- fingerprint recognition technology With the development of fingerprint recognition technology, it has been widely used in many fields. Such as mobile phones, tablets and televisions in electronic equipment terminals; access control and safes in security systems.
- the implementation methods of fingerprint acquisition mainly include optical, capacitive and ultrasonic imaging.
- the fingerprint recognition technology using optical fingerprint collection has a relatively large recognition range and relatively low cost.
- a fingerprint identification device includes a substrate, a transparent cover plate directly above the substrate, a detection light source located at a first side of the transparent cover plate, and a photoelectric sensor located at the transparent cover a side of the lower surface of the plate; wherein the transparent cover has a refractive index smaller than a refractive index of the skin of the fingerprint portion of the human finger, the transparent cover has a side on the first side, and the side is The angle ⁇ between the upper surfaces of the transparent cover plates is an acute angle, and the detecting light source is configured to provide a light beam toward the side of the transparent cover such that the light beam passes through the transparent cover The side surface is incident on the upper surface of the transparent cover plate, and the light beam is totally reflected on the upper surface of the transparent cover plate in the case where the upper surface of the transparent cover plate is in contact with air, and the photosensor is configured as Receiving a light beam reflected back through the upper surface of the transparent cover.
- Another embodiment of the present invention further provides a fingerprint identification system, including any of the above fingerprint recognition devices provided by the embodiments of the present invention.
- FIG. 1 is a schematic structural view of a liquid crystal display having a fingerprint recognition function in the related art
- FIGS. 2a to 2d are schematic structural diagrams of a fingerprint identification apparatus according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of light propagation at a fingerprint valley and a ridge position when a finger is touched according to an embodiment of the present invention
- FIG. 4a is a schematic diagram of a position of an angle ⁇ and a touch area in a fingerprint recognition apparatus according to Embodiment 1 of the present invention
- FIG. 4b is a schematic diagram of a position of an angle ⁇ and a touch area in a fingerprint identification device according to Embodiment 2 of the present invention.
- FIG. 4c is a schematic diagram of a position of an angle ⁇ and a touch area in a fingerprint identification device according to Embodiment 3 of the present invention.
- FIG. 4 is a schematic diagram of a position of an angle ⁇ and a touch area in a fingerprint identification device according to Embodiment 4 of the present invention.
- FIG. 5 is a schematic structural diagram of a photosensor disposed on an array substrate in a fingerprint identification device according to an embodiment of the present invention
- 5b is a schematic structural diagram of a photosensor disposed on a counter substrate in a fingerprint identification device according to an embodiment of the present invention
- FIG. 5 is a schematic structural diagram of a photosensor disposed between a transparent cover and a counter substrate in a fingerprint identification device according to an embodiment of the present invention.
- a liquid crystal display having a fingerprint recognition function generally includes a backlight 1 , an array substrate 2 , a liquid crystal layer 3 , a counter substrate 4 , and a cover glass 5 .
- the photosensor 01 is generally disposed on the array substrate 2 and utilized.
- the backlight 1 is used as a light source for detection. When the finger 6 touches the glass cover 5, the light of the backlight 1 passes through the array substrate 2, the liquid crystal layer 3, the opposite substrate 4, and the cover glass 5, and is touched by the finger 6.
- the glass cover 5, the opposite substrate 4, and the liquid crystal layer 3 are sequentially passed to the photosensor 01, thereby determining the valley of the fingerprint of the finger 6 by detecting the signal size of the photosensor 01 (hereinafter referred to as a valley). And the position of the peak (hereinafter referred to as the ridge) to achieve fingerprint recognition.
- the transmittance of the liquid crystal layer 3 is low, the light energy of the backlight 1 in the liquid crystal display twice after passing through the liquid crystal layer 3 to reach the photosensor 01 is very low.
- the light energy difference of the divergent light reflected by the valley and the ridge of the fingerprint of the finger 6 is extremely small, and is also between the valleys of the finger fingerprint. There is interference of ambient light, so the above liquid crystal display is difficult to accurately identify the fingerprint.
- the embodiment of the invention provides a fingerprint identification device and a fingerprint identification system, so that the light intensity of the reflected light of the fingerprint valley and the ridge received by the photoelectric sensor has a large difference, so as to improve the accuracy of the fingerprint identification system.
- a fingerprint identification device as shown in FIG. 2a to FIG. 2d, includes a substrate 10, a transparent cover 11 directly above the substrate 10, a detection light source 12 and a plurality of photosensors 01;
- the refractive index of the transparent cover 11 is smaller than the refractive index of the skin of the fingerprint portion of the human finger, and one side of the transparent cover 11 facing the detecting light source 12 is an inclined surface, and the angle between the inclined surface and the upper surface of the transparent cover 11 ⁇ is an acute angle;
- the detecting light source 12 is located on the inclined surface side of the transparent cover 11, and the light emitted from the detecting light source 12 passes through the inclined surface of the transparent cover 11 to be incident on the transparent cover 11, and when the upper surface of the transparent cover 11 and the air Total reflection occurs on the upper surface of the transparent cover 11 during contact;
- the finger 15 touches the upper surface of the transparent cover 11, the finger 15 reflects part of the light to the photosensor 01;
- the photosensor 01 is located on the lower surface side of the transparent cover 11, and the photosensor 01 is for receiving light reflected back from the upper surface of the transparent cover 11.
- one side surface of the transparent cover plate is disposed as an inclined surface, so that the angle between the inclined surface of the transparent cover plate and the upper surface is an acute angle, and is disposed on the inclined surface side of the transparent cover plate.
- Detection light source When the finger 15 is touchless, since the refractive index of the transparent cover is greater than the refractive index of the air, it is only necessary to ensure that the light incident on the transparent cover 11 through the inclined surface is illuminated.
- the incident angle of the upper surface of the cover is greater than the critical angle of total reflection when the light enters the transparent cover, it is ensured that the light incident from the inclined surface of the transparent cover to the transparent cover occurs on the upper surface of the transparent cover. reflection.
- the photosensor is positioned to receive light reflected back from the upper surface of the transparent cover, thereby detecting the magnitude of the received light intensity using the photosensor. As shown in FIG. 3, when the finger 15 touches the upper surface of the transparent cover 11, the valley of the fingerprint is not in contact with the transparent cover 11, so that the total reflection of the light B1 at the valley position produces only the reflected light B2, and the light can be totally reflected.
- the refractive index of the transparent cover 11 is smaller than the refractive index of the skin of the finger portion of the human finger, a part of the light B1 is refracted at the ridge position to form the refracted light C1 into the air, part of The reflection occurs to form the reflected light C2 to be irradiated onto the photosensor 01, resulting in a large difference in the light intensity of the light reflected at the valley position and the ridge position, thereby improving the accuracy of the fingerprint recognition apparatus.
- the light of the detection light source does not need to pass through the liquid crystal layer a plurality of times, it is possible to ensure a large light intensity reflected to the photosensor, and the accuracy of the fingerprint recognition apparatus can be further improved.
- the detection is performed.
- the light source 12 is disposed perpendicular to the upper surface of the transparent cover 11, and the direction of propagation of the parallel light emitted from the detecting light source 12 is parallel to the upper surface of the transparent cover 11.
- the structure is convenient to assemble, but a part of the light reflected by the parallel light emitted from the detecting light source 12 is reflected when entering the transparent cover 11, so that part of the light energy is lost.
- the emitted parallel light is incident perpendicularly on the inclined surface of the transparent cover (for example, the detection light source 12 can be attached to the inclined surface S1 of the transparent cover 11).
- the parallel light emitted from the detecting light source 12 is incident perpendicularly on the inclined surface S of the transparent cover 11, so that the light energy has almost no reflection loss on the inclined surface S, and the light intensity incident on the transparent cover 11 is increased.
- the accuracy of fingerprint recognition is improved.
- the structure has certain difficulties in the process, and the requirements for the light source are high, and usually require value. A higher flexible light source is used to achieve this.
- the transparent cover 11 is selected as a glass cover.
- the transparent cover plates of most display devices are glass cover plates, and the refractive index of the glass cover plates is similar to the refractive index of each film layer in the display panel, which can reduce energy loss.
- the substrate 10 is a display panel
- the display panel may be, for example, a liquid crystal display panel or an organic electroluminescence display panel, which is not limited herein.
- the display panel has a display area and a peripheral area
- the photoelectric sensor can be disposed in the display area by selecting an appropriate angle ⁇ , and the photoelectric sensor can also be disposed in the peripheral area.
- it can also be partially disposed in the display area to be disposed in the peripheral area, which is not limited herein.
- the photosensors are all disposed in the display area, or both are disposed in the peripheral area.
- the display panel has a display area A/A and a peripheral area O;
- the photosensor 01 When the photosensor 01 is located in the display area A/A, it may be according to the refractive index of the transparent cover 11, the incident angle ⁇ , the thickness of the transparent cover 11, the thickness of each film between the photosensor 01 and the transparent cover 11, and the refraction.
- the transparent cover of the rate, transparent cover 11 is designed to have a transparent cover from the edge of one side of the inclined surface to the vertical projection of the upper surface of the transparent cover 11 at the interface of the display area A/A and the peripheral area O on the opposite side.
- the refractive index of each film layer between the transparent cover and the photosensor is the same as the refractive index of the transparent cover.
- the range of the angle ⁇ is determined according to the following formula:
- N1 represents the refractive index of the transparent cover
- h represents the thickness of the transparent cover
- d represents the distance between the light receiving surface K of the photosensor 01 and the upper surface S2 of the transparent cover 11
- L1 represents the transparent cover 11.
- n 0 represents the position of the light source 12 for detection
- the refractive index of the medium at which it is located i.e., the refractive index of the medium adjoining the inclined surface on one side of the inclined surface
- ⁇ 1 represents the incident angle at the upper surface S2 of the light after entering the transparent cover 11.
- the light receiving surface K of the photosensor 01 and the upper surface S2 of the transparent cover 11 are parallel to each other.
- Embodiment 1 is a diagrammatic representation of Embodiment 1:
- ⁇ ' indicates the angle of refraction after the parallel light enters the transparent cover 11
- w indicates the width of the cover area irradiated to the upper surface after the parallel light enters the transparent cover 11.
- Embodiment 2 is a diagrammatic representation of Embodiment 1:
- the angle ⁇ between the inclined surface S1 of the transparent cover 11 and the upper surface S2 of the transparent cover is further determined according to the width w 1 of the touch area;
- the angle ⁇ between the inclined surface S1 of the transparent cover 11 and the upper surface S2 of the transparent cover is also transparent according to the time when the finger touches the transparent cover.
- the refractive index ⁇ of the reflected light that is partially reflected at the contact between the plate and the finger is determined;
- n' denotes the refractive index of the skin of the human fingerprint portion
- ⁇ 2 denotes a refraction angle at which the light is refracted at the contact of the transparent cover with the finger when the finger touches the transparent cover.
- the thickness h of the transparent cover is, for example, 0.55 mm, and the distance d of the photoelectric sensor from the upper surface of the transparent cover is 0.953 mm, and the upper surface of the transparent cover 11 is inclined.
- the medium at the position of the detecting light source 12 is air, and the refractive index n 0 of the air is 1.
- the width w 1 of the finger touch area corresponding to the different angle ⁇ and the reflectance ⁇ of the partially reflected reflected light can be obtained by the above formula. For example, as shown in Table 1 and Table 2 below:
- the fingerprint identification device provided by the embodiment of the present invention can adjust the size of the finger touch area according to the angle ⁇ , and at the same time, according to the size of the finger touch area actually required and the accuracy of the required fingerprint recognition. Appropriate angle ⁇ .
- the width w 1 of the finger touch area is relatively large, and the width of the detection area is relatively large. But there will be an effect of ambient light.
- the display panel when a plurality of photosensors 01 are located in the display area A/A, as shown in FIGS. 5a to 5c, the display panel has a relative setting in the display area A/A.
- the photosensor 01 is located, for example, on the array substrate 101 facing the opposite substrate 102.
- the photosensor 01 is located, for example, on the side of the opposite substrate 102 facing the array substrate 101; or
- the photosensor 01 is located, for example, between the transparent cover 11 and the opposite substrate 102.
- the photosensor is located on the side of the array substrate facing the opposite substrate, which is convenient in technology.
- the first embodiment and the second embodiment are described by taking a photosensor on a display area as an example.
- the case where the photosensor is placed in the peripheral area will be described below.
- the display panel has a display area A/A and a peripheral area O;
- the refractive index of the transparent cover 11, the incident angle, the thickness of the transparent cover 11, and the photosensor 01 and the transparent cover 11 may be used.
- the thickness and refractive index of each film layer, the width of the upper surface of the transparent cover 11 from the inclined surface side to the edge of the opposite side peripheral region O, the width of the peripheral region O, the width of the detection region, and the transparent cover 11 The refractive index of the medium through which the light reflected from the surface enters into the peripheral region O is designed to be in the range of the angle ⁇ between the inclined surface S1 of the transparent cover 11 and the upper surface S2.
- the refractive index of each film layer between the transparent cover and the photosensor is the same as the refractive index of the transparent cover.
- the range of the angle ⁇ is determined according to the following formula:
- N1 denotes the refractive index of the transparent cover
- h denotes the thickness of the transparent cover 11
- d denotes the distance of the light receiving surface K of the photosensor from the upper surface S2 of the transparent cover
- L2 denotes the width of the peripheral area O
- L denotes a transparent cover
- the upper surface S2 of the plate 11 has a width from the edge of the inclined surface side to the peripheral portion of the opposite side
- n 0 represents the refractive index of the medium at the position where the detecting light source is located (that is, the inclined surface is adjacent to the inclined surface side).
- ⁇ 1 represents the incident angle at the upper surface after the light enters the transparent cover
- n2 represents the refractive index of the medium through which the light reflected from the upper surface of the transparent cover enters the peripheral region.
- Embodiment 3 is a diagrammatic representation of Embodiment 3
- ⁇ ′ represents the angle of refraction of the parallel light entering the transparent cover 11
- w represents the width of the illumination area irradiated to the upper surface of the transparent cover 11 after entering the transparent cover 11
- ⁇ represents the parallel light reflected by the upper surface of the transparent cover 11
- s is the width of the detection region M in the peripheral region O
- d 1 indicates that the parallel light reflected by the upper surface of the transparent cover 11 is irradiated to the interface between the display region A/A and the peripheral region O a minimum distance from the upper surface of the transparent cover 11
- d 2 indicates that the parallel light reflected by the upper surface of the transparent cover 11 is irradiated to the upper surface of the photosensor 01 at the interface between the display area A/A and the peripheral area O (ie, The maximum distance of the light receiving surface of the photosensor 01).
- Embodiment 4 is a diagrammatic representation of Embodiment 4:
- the angle ⁇ between the inclined surface of the transparent cover and the upper surface of the transparent cover is also determined according to the width s of the detection region M in the peripheral region O.
- the angle ⁇ between the inclined surface of the transparent cover and the upper surface of the transparent cover is further determined according to the width w 1 of the touch area;
- the angle ⁇ between the inclined surface of the transparent cover and the upper surface of the transparent cover is also according to the finger touch transparent cover time in the transparent cover and the finger
- the refractive index ⁇ of the reflected light that is partially reflected at the contact is determined;
- n' denotes the refractive index of the skin of the human fingerprint portion
- ⁇ 2 denotes a refraction angle at which the light is refracted at the contact of the transparent cover with the finger when the finger touches the transparent cover.
- the thickness h of the transparent cover is 0.55 mm
- the distance d of the photoelectric sensor from the upper surface of the transparent cover is 0.953 mm
- the upper surface of the transparent cover 11 is inclined.
- the medium at the position where the light source for detection is located is air
- the refractive index n 0 of the air is 1.
- the medium of the peripheral region O is air
- the refractive index of the air is 1.
- the width w 1 of the finger touch area corresponding to the different angle ⁇ , the reflectance ⁇ of the partially reflected reflected light, and the width s of the detection area M in the peripheral area O can be obtained.
- the fingerprint identification device provided by the embodiment of the present invention can adjust the size of the finger touch area according to the angle ⁇ , and at the same time, according to the size of the finger touch area, the width of the detection area M, and the required fingerprint identification.
- the accuracy of the size is designed to the appropriate angle ⁇ .
- the device further includes a light blocking device disposed between the display panel (ie, the substrate 10) and the transparent cover 11 in the peripheral region O.
- the light blocking layer may include ink, which is not limited herein.
- the light blocking layer can prevent the detection area from being affected by ambient light, but the width of the finger touch area and the width of the detection area are relatively small.
- a plurality of via holes are disposed in the light blocking layer, so that the transparent cover is provided. Light reflected from the surface of the board is irradiated onto the photosensor through a via in the light blocking layer.
- the outer frame 14 surrounding the display panel (ie, the substrate 10), the transparent cover 11, and the detecting light source 12 is further included. There are no restrictions here.
- an adhesive layer is further disposed between the transparent cover and the display panel, so that the transparent cover and the display panel are fixed to each other by the adhesive layer, which is not limited herein.
- the embodiment of the present invention further provides a fingerprint identification system, which includes any of the above-mentioned fingerprint recognition devices provided by the embodiments of the present invention. Since the principle of solving the problem by the fingerprint identification system is similar to the foregoing fingerprint identification device, the implementation of the fingerprint identification system can refer to the implementation of the foregoing fingerprint identification device, and the repeated description is not repeated.
- the fingerprint identification device and the fingerprint identification system provided by the embodiment of the invention provide a side surface of the transparent cover plate inclined with respect to the upper surface thereof so that the angle between the side surface of the transparent cover plate and the upper surface is an acute angle and is transparent
- a light source for detection is provided on the inclined surface side of the cover.
- the position of the returned light is used to detect the intensity of the light.
- the valley of the fingerprint does not contact the transparent cover. Therefore, the total reflection of the light at the valley position only produces reflected light, and the light energy is completely Reflected back, and the ridge of the fingerprint is in contact with the transparent cover. Since the refractive index of the transparent cover is smaller than the refractive index of the human body, part of the light is refracted at the ridge position to form refracted light into the air, and part of the light is reflected to form reflected light to the photoelectric On the sensor, the light intensity of the light reflected at the position of the valley and the position of the ridge is greatly different, thereby improving the fingerprint recognition device Accuracy.
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Abstract
一种指纹识别装置及指纹识别系统。该指纹识别装置包括:基板;透明盖板,位于所述基板正上方;检测用光源,位于所述透明盖板的第一侧;以及光电传感器,位于所述透明盖板的下表面一侧,其中,所述透明盖板的折射率小于人体手指指纹部分的皮肤的折射率,所述透明盖板的在所述第一侧具有一侧面,且所述侧面与所述透明盖板的上表面之间的夹角α为锐角,所述检测用光源构造为朝向所述透明盖板的所述侧面提供光束,使得所述光束穿过所述透明盖板的所述侧面入射至所述透明盖板的上表面,并且在所述透明盖板的上表面与空气接触的情况下所述光束在所述透明盖板的上表面发生全反射,所述光电传感器构造为接收经所述透明盖板的所述上表面反射回来的光束。该指纹识别装置能够提高指纹识别装置的准确率。
Description
本发明实施例涉及一种指纹识别装置及指纹识别系统。
随着指纹识别技术的发展,使其在诸多领域得到广泛的应用。如电子设备终端中的手机、平板电脑和电视等;安全防护系统中的门禁和保险柜等。在指纹识别技术中指纹采集的实现方式主要有光学式、电容式和超声成像式等,其中采用光学式进行指纹采集的指纹识别技术的识别范围相对较大,且成本相对较低。
发明内容
本发明实施例提供的一种指纹识别装置,包括基板;透明盖板,位于所述基板正上方;检测用光源,位于所述透明盖板的第一侧;以及光电传感器,位于所述透明盖板的下表面一侧;其中,所述透明盖板的折射率小于人体手指指纹部分的皮肤的折射率,所述透明盖板的在所述第一侧具有一侧面,且所述侧面与所述透明盖板的上表面之间的夹角α为锐角,所述检测用光源构造为朝向所述透明盖板的所述侧面提供光束,使得所述光束穿过所述透明盖板的所述侧面入射至所述透明盖板的上表面,并且在所述透明盖板的上表面与空气接触的情况下所述光束在所述透明盖板的上表面发生全反射,所述光电传感器构造为接收经所述透明盖板的所述上表面反射回来的光束。
本发明另一实施例还提供了一种指纹识别系统,包括本发明实施例提供的上述任一种指纹识别装置。
为了更清楚地说明本发明实施例的技术方案,下面将对实施例或相关技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅涉及本发明的一些实施例,并非对本发明的限制。
图1为相关技术中的具有指纹识别功能的液晶显示器的结构示意图;
图2a至图2d为本发明实施例提供的指纹识别装置的结构示意图;
图3为本发明实施例提供的手指触控时指纹谷与脊位置处光线传播示意图;
图4a为本发明实施例一提供的指纹识别装置中夹角α与触控区域的位置示意图;
图4b为本发明实施例二提供的指纹识别装置中夹角α与触控区域的位置示意图;
图4c为本发明实施例三提供的指纹识别装置中夹角α与触控区域的位置示意图;
图4d为本发明实施例四提供的指纹识别装置中夹角α与触控区域的位置示意图;
图5a为本发明实施例提供的指纹识别装置中光电传感器设置于阵列基板的结构示意图;
图5b为本发明实施例提供的指纹识别装置中光电传感器设置于对向基板的结构示意图;
图5c为本发明实施例提供的指纹识别装置中光电传感器设置于透明盖板与对向基板之间的结构示意图。
相关技术中,应用于液晶显示器例如手机等移动终端的光学式指纹识别技术尚不成熟。如图1所示,具有指纹识别功能的液晶显示器一般包括背光源1、阵列基板2、液晶层3、对向基板4、以及玻璃盖板5、光电传感器01一般设置于阵列基板2上,利用背光源1作为检测用光源,当手指6触控玻璃盖板5时,背光源1的光依次经过阵列基板2、液晶层3、对向基板4和玻璃盖板5后,在手指6触控的地方发生漫反射后再依次经过玻璃盖板5、对向基板4和液晶层3后到达光电传感器01,从而通过检测光电传感器01的信号大小确定手指6的指纹的波谷(以下称为谷)和波峰(以下称为脊)的位置,实现指纹识别。但由于液晶层3的透过率较低,因此上述液晶显示器中背光源1的光两次经过液晶层3后到达光电传感器01的光能量是非常低
的,并且由于光线是由手指6漫反射回光电传感器01的,而手指6指纹的谷和脊所漫反射的发散光的光能量差异是极小的,同时在手指指纹的谷脊之间还存在环境光的干扰,因此上述液晶显示器难以对指纹进行准确的识别。
有鉴于于此,本发明实施例提供一种指纹识别装置及指纹识别系统,使光电传感器接收到的指纹谷和脊的反射光的光强具有较大差异,以提高指纹识别系统的准确率。
下面结合附图,对本发明实施例提供的指纹识别装置及指纹识别系统的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明开保护的范围。
附图中各部件的形状和大小不反映指纹识别面板和指纹识别装置的真实比例,目的只是示意说明本发明内容。
本发明实施例提供的一种指纹识别装置,如图2a至图2d所示,包括基板10,以及位于基板10正上方的透明盖板11,检测用光源12和多个光电传感器01;其中,
透明盖板11的折射率小于人体手指指纹部分的皮肤的折射率,透明盖板11的面对检测用光源12的一个侧面为倾斜面,且倾斜面与透明盖板11的上表面的夹角α为锐角;
检测用光源12位于透明盖板11的倾斜面一侧,且检测用光源12发出的光穿过透明盖板11的倾斜面而入射至透明盖板11,并且当透明盖板11上表面与空气接触时光在透明盖板11的上表面会发生全反射;
在有手指15触控该透明盖板11上表面时,手指15将部分光反射到光电传感器01;
光电传感器01位于透明盖板11的下表面一侧,且光电传感器01用于接收经透明盖板11上表面反射回来的光。
本发明实施例提供的上述指纹识别装置,将透明盖板的一个侧面设置为倾斜面,使透明盖板的倾斜面与上表面的夹角为锐角,并在透明盖板的倾斜面一侧设置检测用光源。当无手指15触控时,由于透明盖板的折射率是大于空气的折射率的,因此只要保证经倾斜面入射到透明盖板11内的光在照至透
明盖板上表面时的入射角大于光线由透明盖板进入空气时全反射的临界角,就可以保证从透明盖板的倾斜面入射至透明盖板的光在透明盖板的上表面发生全反射。将光电传感器在可以接受到经透明盖板上表面反射回来的光的位置,从而利用光电传感器检测检测其接收到的光强的大小。如图3所示,当手指15触摸到透明盖板11上表面时时,指纹的谷不与透明盖板11接触,因此谷位置处光线B1发生全反射只产生反射光线B2,光能被全部反射回去,而指纹的脊与透明盖板11接触,由于透明盖板11的折射率小于人体手指指纹部分的皮肤的折射率,因此在脊位置处光线B1一部分发生折射形成折射光线C1进入空气,一部分发生反射形成反射光线C2照射至光电传感器01上,导致谷位置处与脊位置处所反射的光的光强差异较大,从而提高指纹识别装置的准确率。
此外,在上述指纹识别装置中,由于检测用光源的光不需要多次穿过液晶层,因此可以保证反射至光电传感器上的光强较大,从而可以进一步提高指纹识别装置的准确率。
在实施时,在本发明实施例提供的上述指纹识别装置中,控制检测用光源发出的光例如为平行光,且该平行光入射至透明盖板的入射角β满足β=90°-α,或β=0°。
例如,在本发明实施例提供的上述指纹识别装置中,当检测用光源发出的平行光入射至透明盖板的入射角β=90°-α时,如图2a和图2c所示,检测用光源12设置为与透明盖板11的上表面垂直,而检测用光源12发出的平行光的传播方向与透明盖板11的上表面平行。该结构方便组装,但是检测用光源12发出的平行光在进入透明盖板11时会有一部分光发生反射,从而会有部分光能损失。
例如,图2b和图2d示出了在本发明实施例提供的上述指纹识别装置中,检测用光源发出的平行光入射至透明盖板的入射角β=0°的情况,即检测用光源12发出的平行光垂直射入透明盖板的倾斜面(例如,可以将检测用光源12贴附在透明盖板11的倾斜面S1上)。在此情况下,检测用光源12发出的平行光垂直射入透明盖板11的倾斜面S,从而使得光能在此倾斜面S几乎无反射损失,提高入射到透明盖板11的光强度,进而提高指纹识别的准确率。但是该结构在工艺上存在一定难度,并且对光源的要求较高,通常需要价值
较高昂的柔性光源来实现。
进一步地,在本发明实施例提供的指纹识别装置中,透明盖板11选择为玻璃盖板。一是目前大多数显示装置的透明盖板均为玻璃盖板,再则玻璃盖板的折射率与显示面板中的各膜层的折射率比较相近,可以降低能量损失。
进一步地,例如,在本发明实施例提供的上述指纹识别装置中,基板10为显示面板,显示面板例如可以为液晶显示面板,也可以为有机电致发光显示面板,在此不作限定。
例如,在本发明实施例提供的上述指纹识别装置中,显示面板具有显示区域和周边区域,通过选择适当的夹角α可以将光电传感器设置在显示区域,也可以将光电传感器设置在周边区域,当然也可以部分设置在显示区域部分设置在周边区域,在此不作限定。
例如,为了避免检测区在显示区域和周边区域上接收的光能存在差异从而影响指纹识别的准确率,将光电传感器均设置在显示区域,或均设置在周边区域。
例如,在本发明实施例提供的上述指纹识别装置中,如图4a和图4b所示,显示面板具有显示区域A/A和周边区域O;其中,
当光电传感器01位于显示区域A/A内,可以根据透明盖板11的折射率、入射角β、透明盖板11的厚度、光电传感器01与透明盖板11之间各膜层的厚度以及折射率、透明盖板11的上表面由倾斜面一侧的边缘至相对侧的显示区域A/A与周边区域O的界面在的透明盖板11的上表面上的垂直投影的宽度,设计透明盖板11的倾斜面S1与上表面S2的夹角α的范围。
下面以透明盖板与光电传感器之间各膜层的折射率与透明盖板的折射率相同为例进行说明。
例如,在本发明实施例提供的上述指纹识别装置中,当多个光电传感器01位于显示区域A/A时,夹角α的范围根据如下公式确定:
h·tanθ1+h/tanα+d·tanθ1<L1
其中,当β=90°-α时,θ1=arcsin(sinβ·n0/n1),当β=0°时,θ1=α;
n1表示透明盖板的折射率,h表示透明盖板的厚度,d表示光电传感器01的光接收表面K与所述透明盖板11的上表面S2之间的距离,L1表示透明盖板11的上表面S2从倾斜面一侧的边缘至相对侧的显示区域A/A与周边
区域O的界面在的透明盖板11的上表面上的垂直投影的宽度,n0表示检测用光源12所在位置处的介质的折射率(即,在所述倾斜面一侧邻接该倾斜面的介质的折射率),θ1表示光进入透明盖板11后在其上表面S2处的入射角。例如,光电传感器01的光接收表面K与所述透明盖板11的上表面S2彼此平行。
下面通过两个实施例来说明本发明实施例提供的上述指纹识别装置。
实施例一:
当入射角β等于90°-α时,如图4a所示,透明盖板11的倾斜面与透明盖板11的上表面的夹角α与多个光电传感器01所在的检测区域M满足如下关系式:
β=90°-α (1)
sinβ·n0=sinα′·n1 (2)
θ1=α′+α (3)
w=h·tanθ1+h/tanα (4)
w+d·tanθ1<L1 (5)
其中,α′表示平行光进入透明盖板11后的折射角,w表示平行光进入透明盖11后照射至其上表面的覆盖区域宽度。
由图4a可知,只要满足该检测用光源12发出的平行光束经由透明盖板11的上表面S2反射至光电传感器01所在层时不超过显示区域A/A的边缘即可,即满足上述公式(5)。从而根据上述公式(1)至(5)就可以确定出当光电传感器01位于显示区域A/A内时,透明盖板11的倾斜面S1与透明盖板11的上表面S2的夹角α的取值范围。
实施例二:
当入射角β等于0°时,如图4b所示,透明盖板11的倾斜面与透明盖板11的上表面的夹角α与多个光电传感器01所在的检测区域M的位置满足如下关系式:
θ1=α (6)
w=h·tanθ1+h/tanα (4)
w+d·tanθ1<L1 (5)
由图4b可知,只要满足该检测用光源12发出的平行光束经由透明盖板
1111的上表面S2反射至光电传感器01所在层不超过显示区域A/A的边缘即可,即满足上述公式(5),从而根据上述公式(4)至(6)就可以确定出当光电传感器01位于显示区域A/A内时,透明盖板11的倾斜面S1与透明盖板11的上表面S2的夹角α的取值范围。
进一步地,在本发明实施例提供的上述指纹识别装置中,透明盖板11的倾斜面S1与透明盖板的上表面S2的夹角α的大小还根据触控区域的宽度w1决定;其中,
w1=h·tanθ1+h/tanα
进一步地,在本发明实施例提供的上述指纹识别装置中,透明盖板11的倾斜面S1与透明盖板的上表面S2的夹角α的大小还根据手指触控透明盖板时光在透明盖板与手指接触处发生部分反射的反射光的折射率ρ决定;其中,
θ2=arcsin(n1·sinθ1/n′)
n′表示人体指纹部分的皮肤的折射率,θ2表示手指触控透明盖板时所述光在所述透明盖板与手指接触处发生折射的折射角。
例如,人体指纹部分的皮肤折射率n′=1.55,大于透明盖板11的折射率n1,如图3所示,当光线B1由透明盖板11入射到指纹脊时,相当于由光疏介质入射到光密介质,在脊的位置处发生折射和反射,其中折射光线C1的折射角记为θ2,反射光线为C2的反射角为θ1;而光线B1由透明盖板11入射到指纹谷的位置时,相当于由光密介质入到光疏介质,发生全反射并且只形成反射光线B2。由于指纹谷的位置处的反射光线B2为全反射,因此反射率为100%,而指纹脊的位置处的反射光线C2的反射率却小于100%。
下面以屏幕的显示区域为五寸移动电话为例,透明盖板的厚度h例如为0.55mm,光电传感器距离透明盖板的上表面的距离d为0.953mm,透明盖板11的上表面由倾斜面一侧至相对侧显示区域A的边缘的宽度L1=110+15=125mm,实施例一中,检测用光源12所在位置处的介质为空气,空气的折射率n0为1。通过上述公式可以得到不同的夹角α对应的手指触控区域的宽度w1和发生部分反射的反射光的反射率ρ。例如,如下表1和表2
所示:
| α | w1 | ρ |
| 87.9° | 44.08mm | 78.6% |
| 85.4° | 20.13mm | 59.1% |
| 80.8 | 10.09mm | 35% |
表1
| α | w1 | ρ |
| 89.3° | 45.02mm | 79% |
| 88.4° | 19.71mm | 58.4% |
| 86.9 | 10.19mm | 35.6% |
表2
其中,表1为当β=90°-α时,不同的夹角α对应的手指触控区域的宽度w1和发生部分反射的反射光的反射率ρ;表2为当β=0°时,不同的夹角α对应的手指触控区域的宽度w1和发生部分反射的反射光的反射率ρ。
由表1和表2可以看出当夹角α取值较大时,手指触控区域的宽度w1也较大,但是发生部分反射的反射光的反射率ρ也较大,反射率ρ大会导致指纹脊与谷的反射光的差异较小,从而不利于提高指纹识别的准确率。当夹角α取值较小时,发生部分反射的反射光的反射率ρ也较小,有利于提高指纹识别的准确率,但是手指触控区域的宽度w1也较小。因此本发明实施例提供的上述指纹识别装置,可以根据夹角α调节手指触控区域的大小,同时反过来根据实际需要的手指触控区域的大小、以及要求的指纹识别的准确率的大小设计适当的夹角α。
由上述实施例一和实施例二可以看出,当将检测区设置于显示区域时,手指触控区域的宽度w1相对较大,检测区的宽度也相对较大。但是会存在环境光的影响。
进一步地,在本发明实施例提供的上述指纹识别装置中,当多个光电传感器01位于显示区域A/A时,如图5a至图5c所示,显示面板在显示区域A/A具有相对设置的阵列基板101和对向基板102;其中,对向基板102位于透明盖板11与阵列基板101之间;
如图5a所示,光电传感器01例如位于阵列基板101面向对向基板102
一侧;或
如图5b所示,光电传感器01例如位于对向基板102面向阵列基板101一侧;或
如图5c所示,光电传感器01例如位于透明盖板11与对向基板102之间。
例如,在本发明实施例提供的上述指纹识别装置中,光电传感器位于阵列基板面向对向基板一侧,这样在工艺上便于实现。
上述实施例一和实施例二是以将光电传感器设置于显示区域为例进行说明的。下面介绍将光电传感器设置于周边区域的情况。
例如,在本发明实施例提供的上述指纹识别装置中,如图4c和图4d所示,显示面板具有显示区域A/A和周边区域O;其中,
在光电传感器01位于与倾斜面相对一侧的周边区域O内的情况下,可以根据透明盖板11的折射率、入射角、透明盖板11的厚度、光电传感器01与透明盖板11之间各膜层的厚度以及折射率、透明盖板11的上表面由倾斜面一侧至相对侧周边区域O的边缘的宽度、周边区域O的宽度、检测区的宽度、以及经透明盖板11上表面反射回来的光进入周边区域O所经过的介质的折射率,设计透明盖板11的倾斜面S1与上表面S2的夹角α的范围。
下面以透明盖板与光电传感器之间各膜层的折射率与透明盖板的折射率相同为例进行说明。
例如,在本发明实施例提供的上述指纹识别装置中,当多个光电传感器01位于周边区域O时,夹角α的范围根据如下公式确定:
0<(d-L+h·tanθ1+h/tanα-L2)·cotθ1·cot[arcsin(cosθ1·n1/n2)]<L2
其中,当β=90°-α时,θ1=arcsin(sinβ·n0/n1),当β=0°时,θ1=α;
n1表示透明盖板的折射率,h表示透明盖板11的厚度,d表示光电传感器的光接收表面K距离透明盖板的上表面S2的距离,L2表示周边区域O的宽度,L表示透明盖板11的上表面S2由倾斜面一侧至相对侧的周边区域的边缘的宽度,n0表示检测用光源所在位置处的介质的折射率(即,在所述倾斜面一侧邻接该倾斜面的介质的折射率),θ1表示光进入透明盖板后在上表面处的入射角,n2表示经透明盖板上表面反射回来的光进入周边区域所经过的介质的折射率。
下面通过两个实施例来详细说明本发明实施例提供的上述指纹识别装
置。
实施例三:
当入射角β等于90°-α时,如图4c所示,透明盖板11的倾斜面与透明盖板11的上表面的夹角α与多个光电传感器01所在的检测区域M满足如下关系式:
β=90°-α (1)
sinβ·n0=sinα′·n1 (2)
θ1=α′+α (3)
w=h·tanθ1+h/tanα (4)
L3=L-w-L2 (9)
d2=d-d1 (11)
n2 sinλ=n1·cosθ1 (12)
其中,α′表示平行光进入透明盖板11后的折射角,w表示平行光进入透明盖11后照射至其上表面的照射区域宽度,λ表示平行光经透明盖板11的上表面反射后进入周边区域O时的折射角,s为检测区M在周边区域O的宽度,d1表示经由透明盖板11的上表面反射后的平行光在照射至显示区域A/A与周边区域O界面处距离透明盖板11上表面的最小距离,d2表示经由透明盖板11的上表面反射后的平行光在照射至显示区域A/A与周边区域O界面处距离光电传感器01上表面(即,光电传感器01的光接收表面)的最大距离。
由图4c可知,只要检测区M在周边区域O的宽度s满足0<s<L2,就可以确定出当检测区M位于周边区域O内时,透明盖板11的倾斜面与透明盖板11的上表面的夹角α的取值范围。
实施例四:
当入射角β等于0°时,如图4d所示,透明盖板11的倾斜面与透明盖板11的上表面的夹角α与多个光电传感器01所在的检测区域M的位置满足如
下关系式:
θ1=α (6)
w=h*tanθ1+h/tanα (4)
L3=L-w-L2 (9)
d2=d-d1 (11)
n2sinλ=n1·cosθ1 (12)
由图4d可知,只要检测区M在周边区域O的宽度s满足0<s<L2,就可以确定出当检测区M位于周边区域O内时,透明盖板11的倾斜面与透明盖板11的上表面的夹角α的取值范围。
进一步地,在本发明实施例提供的上述指纹识别装置中,透明盖板的倾斜面与透明盖板的上表面的夹角α还根据检测区M在周边区域O的宽度s决定。
进一步地,在本发明实施例提供的上述指纹识别装置中,透明盖板的倾斜面与透明盖板的上表面的夹角α的大小还根据触控区域的宽度w1决定;其中,
w1=d·tanθ1-(L-h·tanθ1-h/tanα-L2)
进一步地,在本发明实施例提供的上述指纹识别装置中,透明盖板的倾斜面与透明盖板的上表面的夹角α的大小还根据手指触控透明盖板时光在透明盖板与手指接触处发生部分反射的反射光的折射率ρ决定;其中,
θ2=arcsin(n1·sinθ1/n′)
n′表示人体指纹部分的皮肤的折射率,θ2表示手指触控透明盖板时所述光在所述透明盖板与手指接触处发生折射的折射角。
下面以屏幕的显示区域为五寸移动电话为例,透明盖板的厚度h为0.55mm,光电传感器距离透明盖板的上表面的距离d为0.953mm,透明盖板
11的上表面由倾斜面一侧至相对侧周边区域O的边缘的宽度L=110+15+15=140mm,实施例三中,检测用光源所在位置处的介质为空气,空气的折射率n0为1。实施例三和四中,周边区域O的介质为空气,空气的折射率为1。通过上述公式可以得到不同的夹角α对应的手指触控区域的宽度w1、发生部分反射的反射光的反射率ρ、以及检测区M在周边区域O的宽度s。例如,如下表3和表4所示:
| α | w1 | s | ρ |
| 88.28° | 22.03mm | 14.53mm | 82.1% |
| 88.14° | 10.96mm | 7.23mm | 80.8% |
表3
| α | w1 | s | ρ |
| 89.41° | 20.96mm | 13.82mm | 82% |
| 89.37° | 11.69mm | 7.7mm | 80.9% |
表4
其中,表3为当β=90°-α时,不同的夹角α对应的手指触控区域的宽度w1、发生部分反射的反射光的反射率ρ、以及检测区M在周边区域O的宽度s;表4为当β=0°时,不同的夹角α对应的手指触控区域的宽度w1、发生部分反射的反射光的反射率ρ、以及检测区M在周边区域O的宽度s。
由表3和表4可以看出当夹角α取值较大时,手指触控区域的宽度w1和检测区M在周边区域O的宽度s也较大,但是发生部分反射的反射光的反射率ρ也较大,反射率ρ大会导致指纹脊与谷的反射光的差异较小,从而会降低指纹识别的准确率。当夹角α取值较小时,发生部分反射的反射光的反射率ρ也较小,有利于提高指纹识别的准确率,但是手指触控区域的宽度w1和检测区M在周边区域O的宽度s也较小。因此本发明实施例提供的上述指纹识别装置,可以根据夹角α调节手指触控区域的大小,同时反过来根据实际需要的手指触控区域的大小、检测区M的宽度、以及要求的指纹识别的准确率的大小设计适当的夹角α。
进一步地,在本发明实施例提供的上述指纹识别装置中,如图2a至图2d所示,还包括位于周边区域O且设置于显示面板(即基板10)与透明盖板11之间挡光层13。例如,挡光层可以包括有油墨,在此不作限定。
由上述实施例三和实施例四可以看出,当将检测区设置于周边区域时,
挡光层可以使检测区避免受环境光的影响,但是手指触控区域的宽度和检测区的宽度相对较小。
例如,在本发明实施例提供的上述指纹识别装置中,当经透明盖板上表面反射回来的光需要经过该挡光层时,该挡光层中设置有若干过孔,从而使经透明盖板上表面反射回来的光经过该挡光层中的过孔照射至光电传感器上。
进一步地,在本发明实施例提供的上述指纹识别装置中,如图2a至图2d所示,还包括包围显示面板(即基板10)、透明盖板11、以及检测用光源12的外边框14,在此不作限制。
进一步地,例如,在透明盖板与显示面板之间还设置有粘结层,从而通过粘结层使透明盖板与显示面板相互固定,在此不作限制。
基于同一发明构思,本发明实施例还提供了一种指纹识别系统,包括本发明实施例提供的上述任一种指纹识别装置。由于该指纹识别系统解决问题的原理与前述一种指纹识别装置相似,因此该指纹识别系统的实施可以参见前述指纹识别装置的实施,重复之处不再赘述。
本发明实施例提供的上述指纹识别装置及指纹识别系统,将透明盖板的一个侧面设置为相对于其上表面倾斜,使透明盖板的该侧面与上表面的夹角为锐角,并在透明盖板的倾斜面一侧设置检测用光源。当无手指触控时,由于透明盖板的折射率是大于空气的折射率的,因此只要保证经倾斜面入射的光在照至透明盖板上表面时的入射角大于光线由透明盖板进入空气时全反射的临界角,就可以保证从透明盖板的倾斜面入射至透明盖板的光在透明盖板的上表面发生全反射,将光电传感器在可以接受到经透明盖板上表面反射回来的光的位置,从而利用光电传感器检测光强的大小,当有手指触控时,指纹的谷不与透明盖板接触,因此谷位置处光线发生全反射只产生反射光线,光能被全部反射回去,而指纹的脊与透明盖板接触,由于透明盖板的折射率小于人体的折射率,因此在脊位置处光线一部分发生折射形成折射光线进入空气,一部分发生反射形成反射光线照射至光电传感器上,导致谷位置处与脊位置处所反射的光的光强差异较大,从而提高指纹识别装置的准确率。
虽然上文中已经用一般性说明及具体实施方式,对本发明实施例作了详尽的描述,但在本发明实施例的基础上,可以对之作一些修改或改进,这对
本领域技术人员而言是显而易见的。因此,在不偏离本发明精神的基础上所做的这些修改或改进,均属于本发明要求保护的范围。
本申请要求于2015年8月28日递交的中国专利申请第201510543546.6号的优先权,在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
Claims (12)
- 一种指纹识别装置,包括:基板;透明盖板,位于所述基板正上方;检测用光源,位于所述透明盖板的第一侧;以及光电传感器,位于所述透明盖板的下表面一侧,其中,所述透明盖板的折射率小于人体手指指纹部分的皮肤的折射率,所述透明盖板的在所述第一侧具有一侧面,且所述侧面与所述透明盖板的上表面之间的夹角α为锐角,所述检测用光源构造为朝向所述透明盖板的所述侧面提供光束,使得所述光束穿过所述透明盖板的所述侧面入射至所述透明盖板的上表面,并且在所述透明盖板的上表面与空气接触的情况下所述光束在所述透明盖板的上表面发生全反射,所述光电传感器构造为接收经所述透明盖板的所述上表面反射回来的光束。
- 如权利要求1所述的指纹识别装置,其中,所述检测用光源提供的光束为平行光束,且所述平行光束在所述透明盖板的所述侧面的入射角β满足β=90°-α,或β=0°。
- 如权利要求1所述的指纹识别装置,其中,所述透明盖板为玻璃盖板。
- 如权利要求1-3中任一项所述的指纹识别装置,其中,所述基板为显示面板,并且所述显示面板具有显示区域和周边区域;其中,所述光电传感器位于所述显示区域内,所述夹角α根据如下公式确定:h·tanθ1+h/tanα+d·tanθ1<L1其中,当β=90°-α时,θ1=arcsin(sinβ·n0/n1),当β=0°时,θ1=α;n1表示所述透明盖板的折射率,h表示所述透明盖板的厚度,d表示所述光电传感器的光接收表面与所述透明盖板的上表面之间的距离,L1表示所述透明盖板的上表面在所述第一侧的边缘至该第一侧的相对侧的所述显示区域与所述周边区域的界面在所述透明盖板的上表面上的垂直投影的宽度,n0表示在所述透明盖板的第一侧与所述侧面邻接的介质的折射率,θ1表示所述 光束进入所述透明盖板后在所述上表面处的入射角。
- 如权利要求4所述的指纹识别装置,其中,所述夹角α还根据触控区域的宽度w1决定;其中,w1=h·tanθ1+h/tanα。
- 如权利要求4或5所述的指纹识别装置,其中,所述显示面板在显示区域具有相对设置的阵列基板和对向基板;其中,所述对向基板位于所述透明盖板与所述阵列基板之间;所述光电传感器位于所述阵列基板面向所述对向基板一侧;或所述光电传感器位于所述对向基板面向所述阵列基板一侧;或所述光电传感器位于所述透明盖板与所述对向基板之间。
- 如权利要求3所述的指纹识别装置,其中,所述基板为显示面板,并且所述显示面板具有显示区域和周边区域;其中,所述多个光电传感器位于与所述第一侧相对一侧的周边区域内,所述夹角α根据如下公式确定:0<(d-L+h·tanθ1+h/tanα-L2)·cotθ1·cot[arcsin(cosθ1·n1/n2)]<L2其中,当β=90°-α时,θ1=arcsin(sinβ·n0/n1),当β=0°时,θ1=α;n1表示所述透明盖板的折射率,h表示所述透明盖板的厚度,d表示所述光电传感器的光接收表面与所述透明盖板的上表面之间的距离,L2表示周边区域O的宽度,L表示所述透明盖板的上表面在所述第一侧的边缘至第一侧的相对侧的周边区域的外边缘在所述透明盖板的上表面上的垂直投影的宽度,n0表示在所述透明盖板的第一侧与所述侧面邻接的介质的折射率,θ1表示所述光束进入所述透明盖板后在上表面处的入射角,n2表示经所述透明盖板上表面反射回来的光进入周边区域所经过的介质的折射率。
- 如权利要求7所述的指纹识别装置,其中,所述夹角α还根据触控区域的宽度w1决定;其中,w1=d·tanθ1-(L-h·tanθ1-h/tanα-L2)。
- 如权利要求7或8所述的指纹识别装置,其中,还包括位于所述周边区域且设置于所述显示面板与所述透明盖板之间挡光层。
- 如权利要求9所述的指纹识别装置,其中,所述挡光层中设置有多个过孔,经所述透明盖板上表面反射回来的光束经过所述过孔照射至所述光电传感器的光接收表面。
- 一种指纹识别系统,其中,包括如权利要求1-11任一项所述的指纹识别装置。
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Also Published As
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| EP3343433A1 (en) | 2018-07-04 |
| CN105184248A (zh) | 2015-12-23 |
| US20170262686A1 (en) | 2017-09-14 |
| US9811710B2 (en) | 2017-11-07 |
| EP3343433A4 (en) | 2019-04-17 |
| EP3343433B1 (en) | 2022-05-04 |
| CN105184248B (zh) | 2019-03-12 |
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