Source: https://patents.google.com/patent/CN107590428A/en
Timestamp: 2020-04-05 17:16:57
Document Index: 80079468

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CN107590428A - Fingerprint sensor and fingerprint sensing system - Google Patents
Fingerprint sensor and fingerprint sensing system Download PDF
CN107590428A
CN107590428A CN201710548786.4A CN201710548786A CN107590428A CN 107590428 A CN107590428 A CN 107590428A CN 201710548786 A CN201710548786 A CN 201710548786A CN 107590428 A CN107590428 A CN 107590428A
CN201710548786.4A
郑大荣
黄熙创
尹根容
金云培
李旼哲
金正雨
2016-07-06 Priority to KR20160085697 priority Critical
2016-07-06 Priority to KR10-2016-0085697 priority
2016-08-05 Priority to KR10-2016-0100360 priority
2016-08-05 Priority to KR20160100360 priority
2016-12-30 Priority to KR10-2016-0184352 priority
2016-12-30 Priority to KR1020160184352A priority patent/KR20180005588A/en
2017-07-06 Application filed by 三星电子株式会社 filed Critical 三星电子株式会社
2018-01-16 Publication of CN107590428A publication Critical patent/CN107590428A/en
G06K9/00563—Classification; Matching by matching signal segments by applying autoregressive analysis
At least some example embodiments provide a kind of fingerprint sensor, fingerprint sensor package and the fingerprint sensing system of the light source using display panel.The fingerprint sensor includes：Include the imaging sensor of multiple sensor pixels, the sensor pixel is configured as sensing by the light of fingerprint reflection and produces the image information corresponding with the fingerprint；And the pinhole mask of multiple pin holes is limited, wherein each pin hole is formed for launching and being reflected by the fingerprint focus by the light transmission that the fingerprint reflects to imaging sensor, wherein light from multiple Organic Light Emitting Diodes (OLED).
Fingerprint sensor and fingerprint sensing system
The intersection application that correlation is quoted
This application claims the No.10-2016-0085697 submitted on July 6th, 2016 in Korean Intellectual Property Office, in The No.10-2016-0100360 submitted on the 5th of August in 2016, in the No.10-2016-0184352 submitted on December 30th, 2016 The rights and interests of korean patent application, the disclosure of each of which are fully incorporated herein by reference.
The present invention relates to the fingerprint sensors such as optical fingerprint sensor and fingerprint sensing system.
Fingerprint sensor or fingerprint Identification sensor are the sensors for sensing user fingerprints.Recently, make extensively With the smart phone and wearable device for being mounted with fingerprint sensor.It is this on intelligent telephone set and wearable device Fingerprint sensor can sense the fingerprint of user using electrical measurement method or measuring method.
Fingerprint image can be obtained using the optical fingerprint sensor of measuring method using following principle：Pass through figure The light reflected as sensor sensing by the valley line between the crestal line and crestal line of fingerprint.
In order to which such fingerprint sensor is applied into smart phone and wearable device, reduce the chi of fingerprint sensor Performance that is very little and improving fingerprint recognition.
Inventive concept provides fingerprint sensor, fingerprint sensor package on a kind of display and including fingerprint sensing The fingerprint sensing system of device.
According to the one side of present inventive concept, there is provided a kind of fingerprint sensor, including：Imaging sensor, including it is multiple Sensor pixel, the multiple sensor pixel are configured as sensing by the light of fingerprint reflection and produced corresponding with the fingerprint Image information；And limit the pinhole mask of multiple pin holes, wherein each pin hole is formed for will be reflected by the fingerprint Light transmission to imaging sensor focus, and light from multiple Organic Light Emitting Diodes (OLED) launch and it is anti-by the fingerprint Penetrate.
According to the another aspect of inventive concept, there is provided a kind of fingerprint sensor package, it is attached to including being configured as One surface of the display panel including multiple Organic Light Emitting Diodes (OLED) of generation light, the encapsulation include：Encapsulate base Plate；Imaging sensor on the package substrate, described image sensor limit optical receiving region, the optical receiving region by with The light that sensing is produced by the OLED and reflected by fingerprint is set to, and is configured as exporting electric signal, described image sensor is also Logic region is limited, the logic region is configured as by carrying out signal transacting to the electric signal to produce view data, Fingerprint image is produced using caused view data, and exports the fingerprint image；And the multiple OLED and described Pinhole mask between imaging sensor, the pinhole mask include multiple pin holes, and the multiple pin hole is formed for will be by institute The light transmission of fingerprint reflection is stated to the focus of described image sensor.
According to the another aspect of inventive concept, there is provided a kind of fingerprint sensing system, including：Display surface including light source Plate, the light source are configured as the transmitting light with one or more colors related to display operation；Imaging sensor, attachment To a surface of the display panel, and sensing is configured as from the light source and by positioned at the another of the display panel The light of fingerprint reflection on surface, described image sensor are configured as producing image information according to sensing result；And institute The pinhole mask between display panel and described image sensor is stated, the pinhole mask has multiple pin holes, the multiple pin Hole is used for the focus for forming the light reflected by the fingerprint, wherein, in fingerprint sensing operation, described image sensor sensing tool There is the light of some colors in one or more colors and produce described image information.
In at least one example embodiment, a kind of sensing system includes：Display panel, it is configured as producing light and receives Reflected light based on caused light；And sensor, the sensor include：Limit the mask in multiple holes, the mask quilt It is configured to guide the Part I of the reflected light by the mask, wherein the first side of the mask is in the display panel On, and the imaging sensor on the second side of the mask, described image sensor includes multiple sensor pixels, described more Individual sensor pixel is configured as sensing the Part I of the reflected light and produces electric signal based on the light sensed, Wherein described mask is configured as being directed to the Part I of the reflected light in the case where not needing lens described Imaging sensor.
According to the detailed description next carried out with reference to accompanying drawing, the example that present inventive concept will be more clearly understood is implemented Example, in the accompanying drawings：
Fig. 1 is the fingerprint sensing system including fingerprint sensor for showing the example embodiment according to present inventive concept The structure chart of the example of system；
Fig. 2A and Fig. 2 B are the structures for showing sensor pixel and optical sensing region according to Fig. 1 of example embodiment The figure of think of；
Fig. 3 A and Fig. 3 B are to show the light between fingerprint pixel, pin hole and sensor pixel according to example embodiment The figure of the example of propagation path；
Fig. 4 is the figure for showing the example that display panel is attached to according to the fingerprint sensor of present inventive concept；
Fig. 5 and Fig. 6 is show fingerprint sensing system including the fingerprint sensor according to example embodiment saturating View；
Fig. 7 and Fig. 8 is the illustrative embodiments for the pinhole mask for showing the example embodiment according to present inventive concept Figure；
Fig. 9 is the figure of the structure for the fingerprint sensor package for showing the example embodiment according to present inventive concept；
Figure 10 A and Figure 10 B are to show to be attached to fingerprint sensing system according to the fingerprint sensor package of example embodiment In display panel example figure；
Figure 11 A and Figure 11 B are to show to be attached to fingerprint sensing system according to the fingerprint sensor package of example embodiment In display panel another example figure；
Figure 12 is to show the display being attached to according to the fingerprint sensor package of example embodiment in fingerprint sensing system The figure of another example of panel.
Figure 13 A and Figure 13 B are another example embodiments for showing the fingerprint sensing system according to example embodiment Structure chart；
Figure 14 and Figure 15 is to show passing the fingerprint in pinhole mask embedded images sensor according to example embodiment The figure of the example embodiment of sensor；
Figure 16 is to show the fingerprint sensor including the layer of pinholes with embedded structure according to example embodiment Encapsulation, which is attached to, to be shown and the figure of the example of plate；
Figure 17 to Figure 24 is the various knots for the fingerprint sensor package for showing the example embodiment according to present inventive concept The figure of structure；
Figure 25 is the figure for the fingerprint sensor for showing the example embodiment according to present inventive concept；
Figure 26 is the figure of the structure for the fingerprint sensor package for showing the example embodiment according to present inventive concept；
Figure 27 is the figure of the structure for the fingerprint sensor package for showing another example embodiment according to present inventive concept；
Figure 28 A to Figure 28 C are to show the fingerprint sensor for including applying microlens array according to example embodiment The figure of fingerprint sensing system in being encapsulated in；
Figure 29 is to show being arranged on the fingerprint sensor package for applying microlens array according to example embodiment The figure of example on film；
Figure 30 to Figure 32 is the figure for the fingerprint sensing system for showing the example embodiment according to present inventive concept；And
Figure 33 be show according to the example embodiment of present inventive concept include fingerprint sensor or fingerprint sensor seals The block diagram of the processing system of dress.
Hereinafter, some example embodiments of present inventive concept be will be described in detail with reference to the accompanying drawings.
Fig. 1 is the fingerprint sensing system including fingerprint sensor for showing the example embodiment according to present inventive concept The structure chart of the example of system.
With reference to figure 1, fingerprint sensing system 10 can include display panel 11 and fingerprint sensor 12.Fingerprint shown in Fig. 1 Sensor 12 can be optical fingerprint sensor, be sensed by imaging sensor anti-by the valley line between the crestal line and crestal line of fingerprint The light penetrated identifies fingerprint.According to example embodiment, fingerprint sensor 12 can include：Pinhole mask 12_1, fingerprint reflection Light passes through pinhole mask 12_1；And imaging sensor 12_2, it is sensed through pinhole mask 12_1 light to produce telecommunications Number.According to example embodiment, pinhole mask 12_1 may be implemented as opaque material so that allows light to pass through pin hole, and hinders Only light passes through the region for not forming pin hole.In addition, according to example embodiment, pinhole mask 12_1 may be implemented as having low anti- Penetrate the material of rate.
Can be by various types of display panel applications in display panel 11.According to example embodiment, display panel 11 can To be the OLED display panel for including Organic Light Emitting Diode (OLED) layer, formed and sent with one or more in oled layer The light of color and the OLED for performing display operation.However, the example embodiment not limited to this of present inventive concept, and according to this hair The fingerprint sensing system 10 of the example embodiment of bright design can correspond to one of various types of display panels, such as using general Logical backlight or OLED perform liquid crystal display (LCD) panel of display operation.Alternatively, except above-mentioned OLED display panel and Outside LCD, when the light of the light source transmitting from display panel is reflected by fingerprint and in the side of the backboard towards display panel When being transmitted on to (or direction towards fingerprint sensor 12), according to the example embodiment of present inventive concept, corresponding display Panel can apply to display panel 11.
Meanwhile fingerprint sensor 12 may be implemented as semiconductor chip or semiconductor packages and be attached to display panel 11 surface.According to an example embodiment, imaging sensor 12_2 may be implemented as semiconductor layer or semiconductor core Piece, formed with multiple photo-electric conversion elements (for example, photodiode (PD), light in the semiconductor layer or semiconductor chip Electric transistor, grating, the PD etc. of fixation).According to an example embodiment, imaging sensor 12_2 can be realize have it is such as mutual Mend the imaging sensor of metal-oxide semiconductor (MOS) (CMOS) imaging sensor (CIS) and charge coupling device (CCD) etc Semiconductor layer.In the following description, it is assumed that the photo-electric conversion element in imaging sensor 12_2 is implemented as PD.
According to an example embodiment, when realizing fingerprint sensor 12, during package image sensor 12_2, Pinhole mask 12_1 can be stacked on imaging sensor 12_2.Alternatively, during imaging sensor 12_2 is realized, Pinhole mask 12_1 can be stacked on the one or more layers for forming imaging sensor 12_2 in the form of layer.That is, Fingerprint sensor 12 can realize in the form of pinhole mask 12_1 is embedded in imaging sensor 12_2, and can be to embedding Enter to have pinhole mask 12_1 imaging sensor 12_2 execute encapsulation techniques.That is, according to an example embodiment, pin hole Mask 12_1 and imaging sensor 12_2 may be integrally formed.
Pinhole mask 12_1 can be realized by using the various methods of the material with low transmissivity and antiradar reflectivity. For example, pinhole mask 12_1 can be using with antiradar reflectivity (or high-absorbility) and stopping the material of light to realize, and should Material can also keep its hardness in the case that temperature or humidity change.For example, pinhole mask 12_1 can be by silicon Realized on material using pin hole is formed after titanium nitride (TiN) material.Alternatively, for example black nickel of other non-silicon materials or anodic oxygen Change the material that aluminium can be pin hole.
According to an example embodiment, it is included in oled layer in OLED display panel and pinhole mask 12_1 can be basic Upper parallel arrangement.Therefore, can be towards the side of the fingerprint on cover-plate glass from the light sent of multiple OLED in oled layer To transmission, and pin hole can be transferred in the visual angle that the pin hole in by pinhole mask 12_1 is formed by the light that fingerprint reflects and covered Mould 12_1.Therefore, in the fingerprint sensor according to the example embodiment of inventive concept, it is not necessary to which single light guide list is provided Member, the optical guide unit are used for the path that controlling transmission is used for the light of fingerprint sensing.
The sensing of fingerprint sensor 12 is contacted with display panel 11 or the fingerprint near display panel 11.According to this hair In the fingerprint sensing system 10 of the example embodiment of bright design, the display in wearable devices such as smart phones can be identified The fingerprint touched on device, without installing the single button for fingerprint recognition.For example, when display panel 11 corresponds to When the fingerprint of OLED display panel and user are placed on the cover-plate glass of display panel 11, the OLED from display panel 11 The light of transmitting can be transferred to as light source the fingerprint of user and by user fingerprint reflect, and reflected light can penetrate it is aobvious Show the backboard of panel, and imaging sensor 12_2 is transferred to by pinhole mask 12_1.
Imaging sensor 12_2 includes multiple sensor pixels, and each sensor pixel sensing is by the not same district of fingerprint The light of domain reflection, and produce the electric signal corresponding with the light sensed.Each sensor pixel can produce and by fingerprint Crestal line reflection the corresponding electric signal of light, or produce the telecommunications corresponding with the light reflected by the valley line between crestal line Number.The light quantity sensed in PD can change according to the shape of the fingerprint of reflected light, and can according to the light quantity of sensing and Produce the electric signal with varying level.That is, from electric signal caused by multiple sensor pixels can each include pair Than degree information (or image information), can by the electric signal process operations to determine it is corresponding with each sensor pixel Region be crestal line or valley line, and whole fingerprint image can be configured by combining the information determined.
It can be limited in fingerprint sensing system 10 by the finger-print region of optical sampling.For example, can be by multiple fingerprint pictures Plain WFP is defined to multiple sensor pixels corresponding to imaging sensor 12_2, and each fingerprint pixel WFP can correspond to By the subject area shown in a pin hole and a sensor pixel.It can be determined according to Variable Factors relative with each pin hole The fingerprint pixel WFP answered shape and size, the Variable Factors are, for example, between display panel 11 and pinhole mask 12_1 The distance between distance, pinhole mask 12_1 and imaging sensor 12_2, the diameter of pinhole mask 12_1 thickness, pin hole, pin The shape in hole etc..
The pin hole that each fingerprint pixel WFP can correspond in pinhole mask 12_1.Reflection can pass through a pin The region of the light in hole can be included in each fingerprint pixel WFP, and corresponding region can be defined as optical sampling area Domain.According to optical sampling region, optics sense that can also be corresponding with optical sampling region defined in imaging sensor 12_2 Survey region.For example, optical sensing region can include sensor pixel.
Meanwhile although fingerprint pixel WFP is shown in the whole region of the display panel 11 in Fig. 1, this The example embodiment not limited to this of inventive concept.For example, fingerprint pixel WFP can be only located at some regions of display panel 11, Therefore when the fingerprint of user is located at the specific region of display panel 11, fingerprint can be sensed.
In addition, each in multiple pin holes in pinhole mask 12_1 can correspond to it is more in imaging sensor 12_2 Each in individual sensor pixel.For example, a sensor pixel corresponding with a pin hole can include a PD.It is standby Selection of land, a sensor pixel corresponding with a pin hole can include two or more PD.In fig. 1 it is shown that one The sensor pixel that individual sensor pixel is included in multiple PD and optical sensing region includes multiple PD example.Namely Say, pinhole mask 12_1 multiple pin holes can be formed as being mapped to imaging sensor 12_2 multiple pixels, by optical sampling The light of fingerprint pixel reflection in region can be sensed by one or more of optical sampling region PD, and can pass through place Reason reconfigures the whole image of fingerprint from electric signal caused by multiple sensor pixels.
According to an example embodiment, the region in imaging sensor 12_2 can be defined as corresponding to each fingerprint picture Plain WFP, and the region corresponding with each fingerprint pixel WFP can include multiple PD.In addition, sensor pixel can correspond to Region including at least some PD in the multiple PDs corresponding with fingerprint pixel WFP.A that is, sensor Pixels sense corresponds to fingerprint pixel WFP corresponding with sensor pixel light, and prevents and correspond to another fingerprint Pixel WFP light is overlapping.In fig. 1 it is shown that the example below：The region corresponding with each fingerprint pixel WFP includes 5 × 5 Individual PD, and sensor pixel include be used as part thereof of 3 × 3 PD, and can be based on come from relative to each finger 3 × 3 PD in region corresponding line pixel WFP electric signal configures fingerprint image (or partial fingerprints image).
Meanwhile fingerprint sensing system 10 is described as sensing the fingerprint of user.However, the example embodiment of present inventive concept Not limited to this.For example, when predetermined and/or expectation object is located on display panel 11, fingerprint sensor 12 can be sensed by pre- Light that is fixed and/or it is expected object reflection is to produce its sensing result.When each fingerprint pixel of fingerprint sensor 12 produces conduct During the view data of sensing result, view data caused by each fingerprint pixel from fingerprint sensor 12 can be used to match somebody with somebody again Setting in the image of the object on display panel 11.
Fig. 2A and Fig. 2 B are the figures for the design for showing sensor pixel and optical sensing region shown in Fig. 1.In Fig. 2A In Fig. 2 B, the sensor pixel corresponding with a fingerprint pixel is shown, and it is more to assume that each sensor pixel includes Individual PD.
Show that a sensor pixel includes 3 × 3 PD example in Fig. 2A, Fig. 2 B show a sensor pixel Include 2 × 2 PD example.For example, when assuming that multiple PD form a sensor pixel, can will be corresponding with each PD Region be referred to as sense signals pixel.
According to the example embodiment of inventive concept, the center of sensor pixel or the center in optical sensing region can be with pins The center alignment in hole.In addition, the optical sensing region that the reflected light in the Optical Sampling region of fingerprint pixel is sent to can position On multiple PD.For example, the value of the diameter in optical sensing region can correspond to diameter Fd.Such as display panel can be passed through The distance between the distance between pinhole mask, pinhole mask and imaging sensor, the various parameters such as shape of pin hole are adjusted The diameter Fd in whole optical sensing region.As described above, determine the diameter Fd in optical sensing region so that from two or more The light of fingerprint pixel is not overlapping with each sensor pixel.
The number for the PD being that actually sensed in a sensor pixel of light can be according to the diameter Fd in optical sensing region To determine.The electric signal corresponding with a fingerprint pixel can be produced according to the sensing result from multiple PD.According to one Individual example embodiment, can by the processing that is merged to the data value for being included in multiple PD in a sensor pixel come Produce electric signal.
Fig. 3 A and Fig. 3 B are to show fingerprint pixel (or Optical Sampling region), (or the optical sensing of pin hole and sensor pixel Region) between propagation path of light example figure.Fig. 3 A show that a sensor pixel includes PD example, Fig. 3 B Show that a sensor pixel includes multiple PD example.
With reference to figure 3A and Fig. 3 B, pin hole can be located at the sensor in the fingerprint pixel and imaging sensor on display panel Between pixel, and pin hole can form between fingerprint pixel and sensor pixel the focus of the light transmitted.Sent from light source Light reflected by the finger-print region (for example, optical sampling region) in fingerprint pixel and pass through pin hole, and pass through pin hole Light be provided to the corresponding sensor pixel of fingerprint pixel.The PD sensings being included in sensor pixel pass through pin hole Light, and produce the electric signal corresponding with sensing light.In figure 3 a, due to forming a PD in a sensor pixel, Therefore can be by processing operations to the generation contrast number of degrees corresponding with fingerprint pixel from electric signal caused by a PD According to.
When assuming that PD size is fixed, the number of the PD included in a sensor pixel can be according to fingerprint picture Element, pin hole and sensor pixel arrangement and change.For example, when the relatively close sensor pixel of pin hole, can reduce and one The size of the corresponding sensor pixel of individual fingerprint pixel, and in some cases, can be set in a sensor pixel Put a PD.On the other hand, as shown in Figure 3 B, when the distance between pin hole and sensor pixel are relatively large, can increase The size of sensor pixel, therefore multiple PD can be arranged in a sensor pixel.For example, shown in Fig. 3 B one Individual sensor pixel includes four PD example.One sensor pixel can be produced including corresponding with a fingerprint pixel Image information including electric signal, and for example produced and a fingerprint picture by merging four PD corresponding sense result The corresponding electric signal of element.Can be by processing operations to produce and each fingerprint picture to caused electric signal by this way Element corresponding contrast or view data.
Fig. 4 is the figure for showing the example that display panel is attached to according to the fingerprint sensor of present inventive concept.As above institute State, fingerprint sensor 12 can include pinhole mask 12_1 and imaging sensor 12_2, and can correspond to when by partly leading Body technology manufactures semiconductor devices during pinhole mask 12_1 and imaging sensor 12_2.In addition, the shape with the fingerprint shown in Fig. 4 Formula, the part contacted with display panel 11 can correspond to the crestal line of fingerprint, and the part not contacted with display panel 11 can With the valley line corresponding to fingerprint.
In some in exemplary embodiments below, for the ease of describing propagation path of light, show between fingerprint pixel Predetermined and/or expectation interval, but the example embodiment not limited to this of present inventive concept.For example, the border of fingerprint pixel can To be defined as being in contact with each other so that the whole image of fingerprint can be configured as shown in Figure 1.
With reference to figure 4, fingerprint sensor 12 can be attached to the backboard of display panel 11, and can be for example realize have it is all Such as CIS imaging sensors 12_2 semiconductor layer.Each multiple sensor pixels including multiple PD can be formed in image In sensor 12_2, and for example PD can be formed in semiconductor substrate (Sub) by ion implantation technology.In Fig. 4, show The Optical Sampling region corresponding with a fingerprint pixel and corresponding with the sensor pixel region including a PD is gone out Optical sensing region example.
Meanwhile pinhole mask 12_1 can be between display panel 11 and imaging sensor 12_2.Pinhole mask 12_1 Pinhole mask layer can be referred to as, because pinhole mask 12_1 is implemented as single layer.In the example of fig. 4, although in order to It is easy to illustrate and be shown in which to form the pinhole mask 12_1 of the pin hole with 5 × 5 structures, but can be existed with array structure Significantly more pin hole is formed in pinhole mask 12_1.For example, it is contemplated that to the size of fingerprint, can use includes array structure The pinhole mask 12_1 of about 200 × 200 pin holes.
, can be by pinhole mask 12_1 heaps during imaging sensor 12_2 is realized according to an example embodiment It is stacked on imaging sensor 12_2.In such a case, it is possible to inserted between pinhole mask 12_1 and imaging sensor 12_2 Intermediate layer, such as can be with the transparent passivating layer and oxide layer of transmitted light.That is, when pinhole mask 12_1 is implemented as embedding When entering in imaging sensor 12_2, imaging sensor 12_2 can be described as including pinhole mask 12_1.Furthermore, it is possible to base The thickness in the intermediate layer in above-mentioned embedded structure defines the distance between pin hole and sensor pixel, and can be based on away from From defining the size of the sensor pixel corresponding with a fingerprint pixel.
Display panel 11 can correspond to produce the light towards fingerprint, and towards the direction of display panel 11 (or Person is towards the direction of fingerprint sensor) on transmission by one of various types of display panels of light of fingerprint reflection.According to one Example embodiment, display panel 11 can be oled panels, and including multiple OLED 405 as light source.It is for example, multiple OLED 405 can be the light-emitting component of the light of its own transmission a variety of colors, and launch red (R), green (G) and blueness (B) Multiple OLED of light can be included in display panel 11.At least one be included in multiple OLED 405 in display panel 11 The individual light source that may be used as sensing fingerprint.
, can also be in imaging sensor 12_2 when RGB OLED are completely used for sensing fingerprint although Fig. 4 is not shown In realize colour filter (not shown) so that produce white light from display panel 11, and each PD sensings are corresponding with particular color Light.Such as, it is possible to achieve red, green and blue color filter are with corresponding to multiple PD.
According to an example embodiment, the multiple pin holes formed in pinhole mask 12_1 are more with imaging sensor 12_2's Individual sensor pixel alignment.In addition, the diameter W1 in the optical sampling region including the size of fingerprint pixel includes sensor The diameter W2 in the optical sensing region including the size of pixel can be by the distance between pinhole mask 12_1 and fingerprint (i.e., Pin hole is to fingerprint distance D1), the distance between pinhole mask 12_1 and imaging sensor 12_2 (i.e. pin hole to sensor distance D2), the diameter of pin hole and the thickness of pinhole mask determine.In addition, it is determined that optical sampling region diameter W1 when, can be with Consider the spacing Wpitch between fingerprint pixel.According to the example embodiment of inventive concept, include the pinhole mask of multiple pin holes 12_1 can be arranged on imaging sensor 12_2, to form focus, rather than lens are used in imaging sensor 12_2 Unit is formed as focus.
Specifically, when the fingerprint of user is located on display panel 11, sent from the OLED 405 in display panel 11 Light is launched on the direction of the cover-plate glass towards display panel 11, and the light sent is by the crestal line of the fingerprint on cover-plate glass Reflect with valley line, and transmitted towards the backboard of display panel 11, imaging sensor 12_2 senses the back of the body transmitted through display panel 11 The light of plate and pin hole.Therefore, imaging sensor 12_2 can capture fingerprint image.According to the example embodiment of present inventive concept, Fingerprint sensor 12 may be implemented as ultra thin optical sensor, therefore fingerprint image can not need the situation of condenser lens It is lower to be captured by fingerprint sensor 12.
Meanwhile when being directed at fingerprint pixel, pin hole and sensor pixel, the diameter d and thickness T of pin hole, which correspond to, determines base Parameter in pin hole relative to the view angle theta of upper and lower surface.In addition, in addition to the view angle theta of determination, pinhole mask 12_1 The above-mentioned distance D2 between above-mentioned distance D1 and pinhole mask 12_1 and imaging sensor 12_2 between fingerprint can be right Should be in following parameter, the parameter determines the diameter W1 in the optical sampling region including the size of fingerprint pixel and including sensing The diameter W2 in the optical sensing region including the size of device pixel.In addition it is possible to use formula shown in Fig. 4 calculates view angle theta, The diameter W1 and the optics corresponding with the size of sensor pixel in the optical sampling region corresponding with the size of fingerprint pixel The diameter W2 of sensing region, wherein M represent magnifying power and can be defined as D2/D1.
Fingerprint sensor and fingerprint sensing system shown in above-mentioned example embodiment can apply to various fields.As The application of present inventive concept, fingerprint sensor and fingerprint sensing system can apply to the system for including display panel, and example Following system is such as can apply to, wherein the light from the light source transmitting being included in display panel can be to the backboard of display panel Direction transmits.In addition, the example as application, at least some example embodiments of present inventive concept can apply to smart phone (including tablet PC) or wearable device (for example, intelligent watch).Alternatively, according to the example embodiment of present inventive concept Fingerprint sensor and fingerprint sensor package can apply to the ultra-thin camera of Internet of Things (IoT) type.
Fig. 5 and Fig. 6 is to show the fingerprint sensing system including the fingerprint sensor according to example embodiment Perspective view.
With reference to figure 5, fingerprint sensing system 100 can include display panel 110 and fingerprint sensor.Display panel 110 can With including multiple pixels 111 for realizing image, and pixel 111 can each include the light source in above-described embodiment.Example Such as, the light source that each pixel 111 includes can be intended to indicate that predetermined and/or desired color OLED.
Meanwhile fingerprint sensor can be realized using semiconductor wafer.As shown in figure 5, fingerprint sensor can include One or more layers (for example, first layer 120a and second layer 120b) formed with the metal line for transmitting various signals, With the device layer 130 formed with PD.For example, first layer 120a and second layer 120b can include metal line 121a and 121b, Metal line 121a and 121b are realized by the intransitable material of light respectively, and metal line 121a and 121b can be used for hindering The light that gear is reflected and transmitted by fingerprint.Meanwhile can be formed for formed according to above-mentioned example embodiment by fingerprint reflection and Multiple pin holes 122 of the focus of the light of transmission, the plurality of pin hole 122 pass through first layer 120a and second layer 120b.
As example embodiment, metal line 121a and 121b are respectively with each in first layer 120a and second layer 120b Kind form is formed, to prevent light through the region in addition to pin hole 122.For example, form the metal line in first layer 120a 121a can abreast arrange with first direction, and the metal line 121b formed in second layer 120b can with perpendicular to The second direction of first direction is abreast arranged.Example embodiment according to Fig. 5, pinhole mask can not be in fingerprint sensings Be formed as single layer in device, and pin hole 122 can be formed in metal line 121a and 121b multiple layers.
For example, metal line 121a and 121b can be additionally formed, but regardless of for transmitting for imaging sensor The wiring of the electric signal of practical operation.In addition, in addition to the layer of the wiring of practical operation except forming imaging sensor, can be with It is additionally provided in first layer 120a and second layer 120b.In addition, the device layer 130 formed with PD can be arranged under pin hole 122 Side.In this case, due to realizing pin hole 122 in the semiconductor technology for realizing fingerprint sensor, so pin hole 122 It can be defined as being embedded in fingerprint sensor.
Meanwhile display panel 210, pinhole mask layer 220 and device layer can be included with reference to figure 6, fingerprint sensing system 200 230.In this case, pinhole mask layer 220 and device layer 230 may be constructed according to the example embodiment of present inventive concept Fingerprint sensor.In addition, display panel 210 can include multiple light sources similar to the above embodiments, and each light source can To be such as OLED.
For example, pinhole mask layer 220 can be implemented as silicon wafer, metal level or the impenetrable any materials layer of light, and And multiple pin holes 221 can be included.In addition, device layer 230 can be the image sensor layer formed with PD, and can correspond to Through the light of multiple pin holes 221 and the component of electric signal is produced in sensing.As described above, pinhole mask layer 220 and device layer 230 Different layers can be configured as.According to an example embodiment, pinhole mask layer 220 can be for realizing device layer 230 Semiconductor technology in be stacked on device layer 230.In an example embodiment, pinhole mask layer 220 can be positioned so that It is aligned with device layer 230.
Fig. 7 and Fig. 8 is the illustrative embodiments for the pinhole mask for showing the example embodiment according to present inventive concept Figure.
With reference to figure 7, pinhole mask can include the multiple pin holes arranged in the form of an array, and the cross section of each pin hole Can have round-shaped.Each diameter d1 of the pin hole and thickness T1 of pinhole mask can differently change according to the visual angle of determination Become.
Fig. 8 shows another example embodiment of pinhole mask.With reference to figure 8, pinhole mask can include with array shape Multiple pin holes of formula arrangement, and the cross section of each pin hole can have rectangular shape.The diagonal d2 pin holes of each pin hole The thickness T2 of mask can differently change according to the visual angle of determination.In addition, the example embodiment of present inventive concept is not limited to Fig. 7 With Fig. 8 example, (wherein adjacent pin hole is disposed in based on a pin hole in upper and lower, left and right direction in addition to square At upper equal distance), the pin hole formed in pinhole mask is also implemented as being arranged as with diamond shape or any Polygonal shape, and in addition to circular, square or ellipse, the cross section of each pin hole is also implemented as having Hexagon or arbitrary polygon shape.
Fig. 9 is the figure of the structure for the fingerprint sensor package for showing the example embodiment according to present inventive concept.Can be with Fingerprint sensor package is produced by the packaging technology of the fingerprint sensor in above-described embodiment.The fingerprint sensor that Fig. 9 shows Encapsulation 300 can be attached to display panel, and therefore can realize fingerprint sensor on display.In addition, fingerprint sensor Encapsulation 300 may be mounted on the plate (not shown) as sensor IC (IC), and can will be with fingerprint sensor The corresponding view data of fingerprint sensing result caused by encapsulation 300 is supplied to external equipment or system.
With reference to figure 9, fingerprint sensor package 300 can include package substrate 310, the figure on package substrate 310 Pinhole mask 340 as sensor 320 and on imaging sensor 320.Pinhole mask 340 can be according to above-described embodiment To realize.For example, in pinhole mask 340, the region in addition to pin hole can be implemented as the impenetrable any materials of light Layer, and the multiple pin holes extended there through by the light of fingerprint reflection can be formed and passed through.In addition, for supporting pinhole mask 340 Support member 330 can be formed on imaging sensor 320, and pinhole mask 340 can stack and be supported on support member 330 On.
According to said structure, can be formed in fingerprint sensor package 300 have it is corresponding with the height of support member 330 Length air gap.The distance between imaging sensor 320 and pinhole mask 340 can be adjusted according to the height of air gap, because The height of this support member 330 can correspond to determine the diameter in the optical sensing region corresponding with the size of sensor pixel Parameter.
Imaging sensor 320 can include sensing transmitted through the optical receiving region of the light of multiple pin holes of pinhole mask 340 321 and produce the logic region 322 of view data by carrying out logical process to the electric signal from optical receiving region 321. Optical receiving region 321 and logic region 322 can be formed in different chips (or single semiconductor substrate).In this feelings Under condition, optical receiving region 321 and logic region 322 can be classified as single chip.Alternatively, in another embodiment In, optical receiving region 321 and logic region 322 can be implemented in a semiconductor chip.
Optical receiving region 321 can be included in multiple sensor pixels described in above-described embodiment, and each sense Device pixel can include one or more PD.Because light is reflected by the crestal line of fingerprint or valley line, so feeling in sensor pixel The light quantity measured there may be difference, and optical receiving region 321 provide for each sensor pixel to logic region 322 and Differently caused electric signal.Be included in the logic circuit in logic region 322 can be by performing such as modulus to electric signal The processing operation of conversion etc, for configuring, the fingerprint pixel of whole fingerprint image produces contrast for unit or part is schemed As data, and fingerprint image can be configured using the contrast or part image data.It is in addition, caused by this way Fingerprint image can also be supplied to external equipment or system by package substrate 310.
Meanwhile in the embodiment shown in fig. 9, show pinhole mask in the packaging technology of imaging sensor 320 340 are stacked on the structure of the outside installation on imaging sensor 320.Therefore, can be covered by single technique to manufacture pin hole Mould 340 and imaging sensor 320, and can perform by pinhole mask 340 and imaging sensor 320 be assembled into one encapsulation Technique.
Figure 10 A and Figure 10 B are to show showing for the display panel that fingerprint sensor package is attached in fingerprint sensing system The figure of example.In addition, Figure 10 B are shown for the fingerprint sensor package and the attaching components of display panel shown in constitutional diagram 10A Example embodiment.In some example embodiments, it is assumed that fingerprint sensor package is real in the form of the encapsulation shown in Fig. 9 It is existing.
With reference to figure 10A, fingerprint sensing system 400A can include fingerprint sensor package 410A, be attached with fingerprint sensor Encapsulate 410A display panel 420 and the plate 430 for installing fingerprint sensor package 410A.
Fingerprint sensor package 410A can include package substrate 411, the imaging sensor on package substrate 411 412nd, the support member 413 on imaging sensor 412 and the pinhole mask 414 including multiple pin holes are formed.With with above-mentioned phase Same or similar mode, can form air gap between imaging sensor 412 and pinhole mask 414.Plate 430 can correspond to all The motherboard of the printed circuit board (PCB) (PCB) of such as smart phone.When fingerprint sensor package 410A is connected to plate 430, fingerprint passes Sensor encapsulation 410A can be mounted in the form of chip on board (CoB).In addition, view data can be passed by being formed in fingerprint Connection terminal on a sensor encapsulation 410A surface is provided to plate 430.According to an example embodiment, view data can To be provided to plate 430 by forming multiple soldered balls on a fingerprint sensor package 410A surface.
Fingerprint sensor package 410A can also include moulded parts 416A, and can be attached to by attaching components 415A Display panel 420.The element of bonding force can be also kept to be used as bonding film in the case that temperature, humidity etc. change Or liquid-type (or resin) adhesive and be applied to attaching components 415A.For example, attaching components 415A can be implemented as optical lens Bright adhesive (OCA).
For example, attaching components 415A can be arranged on fingerprint sensor package 410A upper surface.Alternatively, bonding member Part 415A can be arranged in the packaging technology of fingerprint sensor on a fingerprint sensor package 410A surface.This In the case of, fingerprint sensor package 410A can be defined as also including attaching components 415A layers.As fingerprint sensor package 410A When being attached to display panel 420, attaching components 415A may be used as cushioning supportive part, and attaching components 415A thickness can be with Influence the distance between fingerprint pixel and pin hole.With attaching components 415A thickness increase, it can increase and be seen by pin hole Fingerprint pixel area, and attaching components 415A thickness can be adjusted, as long as different fingerprint pixels does not overlap each other.
Meanwhile with reference to figure 10B, OCA etc. attaching components 415A can be realized using transparent or semitransparent element. According to an example embodiment, attaching components 415A can be in the form of covering the fingerprint sensor package 410A plane on top To realize.That is, attaching components 415A may be implemented as covering pinhole mask 414 in fingerprint sensor package 410A The region that pin hole is located at, display panel 420 is arrived into fingerprint sensor package 410A engagements.Furthermore, it is possible to according to bonding member Part 415A thickness adjusts the distance between pinhole mask 414 and fingerprint pixel, therefore attaching components 415A thickness can be with It is included in the parameter for the diameter for determining the optical sampling region corresponding with the size of fingerprint pixel.
Figure 11 A and Figure 11 B are show the display panel that fingerprint sensor package is attached in fingerprint sensing system another The figure of one example.In addition, Figure 11 B show the bonding for fingerprint sensor package and display panel shown in constitutional diagram 11A Another example embodiment of element.To the fingerprint sensing including the fingerprint sensor package shown in Figure 11 A and Figure 11 B In the description of the configuration of system, the detailed description with the configuration of identical shown in reference picture 10A and Figure 10 B will be omitted.
Fingerprint sensing system 400B includes fingerprint sensor package 410B, and fingerprint sensing system 400B can also include Display panel 420 accompanying by fingerprint sensor package 410B and the plate 430 for installing fingerprint sensor package 410B.This Outside, fingerprint sensor package 410B can include package substrate 411, imaging sensor 412, support member 413 and pinhole mask 414.In addition, fingerprint sensor package 410B can also include attaching components 415B and moulded parts 416B.According to an example reality Example is applied, attaching components 415B can be along perimeter (i.e. its fringe region) cloth of fingerprint sensor package 410B upper surface Put, display panel 420 is arrived into fingerprint sensor package 410B engagements.In addition, the various assemblies shown in as Figure 11 A, pin hole Mask 414, support member 413, attaching components 415B etc. may be implemented as having with those components shown in Figure 10 A identical or phase As thickness.
With reference to figure 11B, OCA etc. attaching components can be realized using transparent, translucent or opaque element 415B.According to an example embodiment, because attaching components 415B is realized in the form of window frame, therefore hole can be formed with corresponding In the region that pin hole is located at.Therefore, gas can be passed through in the case where being not passed through attaching components 415B by the light that fingerprint reflects Gap (or air layer) and be supplied to imaging sensor 412, and attaching components 415B can be realized using opaque element.This Outside, because the transmissivity of light through air is higher than the transmissivity for the attaching components realized by using transparent or semitransparent material, Therefore can further increase for sensing by the sensitivity of the imaging sensor 412 for the light that fingerprint reflects and transmits.
Figure 12 is another example for showing the display panel that fingerprint sensor package is attached in fingerprint sensing system Figure.In the description of the configuration to the fingerprint sensing system including the fingerprint sensor package shown in Figure 12, will omit with The detailed description of configuration identical configuration shown in reference picture 10A and Figure 10 B.
Fingerprint sensing system 400C includes fingerprint sensor package 410C, and fingerprint sensing system 400C can also include Display panel 420 accompanying by fingerprint sensor package 410C and the plate 430 for installing fingerprint sensor package 410C.This Outside, fingerprint sensor package 410C can include package substrate 411, imaging sensor 412, support member 413, pinhole mask 414 With moulded parts 416C.In addition, the various assemblies shown in as Figure 11 A, pinhole mask 414, support member 413 etc. may be implemented as With with the same or analogous thickness of those components shown in Figure 10 A and Figure 11 A.
In the present embodiment, the attaching components in above-described embodiment can be removed from fingerprint sensing system 400C.At this In the case of kind, being included in the height of the moulded parts 416C in fingerprint sensor package 410C can be more than shown in Figure 10 A and Figure 11 A Embodiment in moulded parts height.Therefore, because the height increase of fingerprint sensor package 410C fringe region, therefore Moulded parts 416C positioned at fingerprint sensor package 410C fringe region can contact with a surface of display panel 420. In addition, with moulded parts 416C height increase, can between a surface of display panel 420 and pinhole mask 414 shape Imaging sensor 412 can be transmitted to by air gap 417 and pin hole into air gap 417, and by the light that fingerprint reflects.
Figure 13 A and Figure 13 B are the structure charts for another example embodiment for showing fingerprint sensing system.In Figure 13 A and In Figure 13 B, the example that fingerprint sensor package is arranged in the form of chip on film (COF) on film is shown.
With reference to figure 13A and Figure 13 B, fingerprint sensing system 500 includes fingerprint sensor package 510, and fingerprint sensing system System 500 can also be including the display panel 520 accompanying by fingerprint sensor package 510 and for installing fingerprint sensor package 510 film 530.Film 530 can include the wiring for interface.Passed in addition, fingerprint sensor package 510 can include image Sensor 511, support member 512, pinhole mask 513 and attaching components 514.Although not shown in Figure 13 A, fingerprint sensor envelope Moulded parts can also be included by filling 510.
Film 530 can be realized using flexible member, and can be formed in film 530 for the wiring of electric signal transmission On at least one surface.Furthermore, it is possible to the wiring through film 530 is further formed in film 530, by signal from film 530 One surface is transferred to another surface.For example, when fingerprint sensor package 510 is attached to display panel 520, towards display The surface of the film 530 of panel 520 can be referred to as first surface, and relative surface can be referred to as second surface.
For example, fingerprint sensor package 510 can with identical with the fingerprint sensor package shown in above-described embodiment or Similar mode is realized.In addition, although one that imaging sensor is arranged on package substrate is described in the above-described embodiments On surface and soldered ball forms an example that view data is supplied to plate by soldered ball on another surface of package substrate, But shown in the embodiment shown in Figure 13 A and view data is supplied to including being routed in interior film for interface 530 rather than the example of package substrate.In addition, although for the ease of the explanation in Figure 13 A, in fingerprint sensor package 510 The thickness of pinhole mask 513 is shown as identical with the thickness of film 530, but the thickness of pinhole mask 513 can be less than film 530 Thickness, or pinhole mask 513 thickness can be more than film 530 thickness.
Meanwhile with reference to figure 13B, it can be formed in film 530 with being enough to allow fingerprint sensor package 510 to extend there through Size hole 531, and fingerprint sensor package 510 can be attached to display surface by forming hole 531 in film 530 Plate 520.According to an example embodiment, hole 531 can be formed in film 530 so that the top of fingerprint sensor package 510 (for example, region that pinhole mask 513 is located at) can extend there through, and the top of fingerprint sensor package 510 can lead to Cross the hole 531 of film 530 and be attached to display panel 520.In addition, according to an example embodiment, fingerprint sensor package 510 can To be attached to display panel 520 by attaching components 514, and attaching components 514 can be with according to the various of above-described embodiment Form (for example, plane form and window frame form) is realized.In addition, attaching components 514 may be implemented as it is transparent or semitransparent Element.
Although the size of attaching components 514 is shown as and fingerprint sensor bag 510 for the ease of the explanation in Figure 13 A The size of upper surface is identical, but present inventive concept not limited to this.For example, according to an example embodiment, attaching components 514 can To be implemented as being more than hole 531, and the fringe region of attaching components 514 can be attached to display panel 520, be attached to simultaneously Around the hole 531 of film 530.
Meanwhile caused signal can be transferred to outside by multiple wirings in film 530 in fingerprint sensor package 510 Portion's equipment or system.For example, can be for transmission to film 530 from signal (for example, view data) caused by fingerprint sensor package 510 Second surface.As example embodiment, connection terminal ct can be arranged on the logic region of imaging sensor 511, and And it is electrically connected to the wiring to be formed in the second surface of film 530.It can be provided for being electrically connected to miscellaneous equipment in film 530 Or the connector 532 of system.For example, it can be sent to from view data caused by fingerprint sensor bag 510 by connector 532 External equipment or system on mainboard (not shown).
According to above-described embodiment, schemed due to can neatly be realized by film 530 from caused by fingerprint sensor package 510 As the transmission path of data, therefore the convenience of the arrangement of the equipment in fingerprint sensing system 500 can be improved.Furthermore, it is possible to Reduce the whole thickness for the fingerprint sensing device assembly 510 being arranged in the form of COF on film 530.
Figure 14 and Figure 15 is the example embodiment for the fingerprint sensor for showing pinhole mask embedded images sensor Figure.For example, in the semiconductor technology for realizing imaging sensor, can be with the identical or phase with the pin hole in above-described embodiment As form hole is formed at least one layer, and form porose layer and can be stacked in the top of the layer formed with PD. For example, because the maintenance chip formed with multiple holes can perform the function of the pinhole mask in above-described embodiment, thus with Chip (sustain wafer) will be maintained to be referred to as pinhole mask in lower embodiment.
Figure 14 is to show front side-illuminated (FSI) type fingerprint sensor according to an example embodiment of present inventive concept Sectional view.
With reference to figure 14, can be realized according to the fingerprint sensor 600A of the present embodiment using FSI methods.Specifically, refer to Line sensor 600A can include being used to realize imaging sensor and multiple chips of pinhole mask.For example, fingerprint sensor 600A can include realizing the device wafer 610A and the maintenance chip 620A on device wafer 610A for having imaging sensor. Multiple pin holes can be formed in chip 620A is maintained, with corresponding to the formation sensor pixel (or PD) in device wafer 610A Region.For example, each in multiple pin holes can be arranged to each sensor with being realized in device wafer 610A The center alignment of pixel.
As example embodiment, device wafer 610A can include semiconductor substrate (for example, P-Sub) and be formed half One or more layers on conductor substrate.For example, it can be formed with one with semiconductor substrate identical crystalline structure growth Or multiple epitaxial layers.
It can be formed in the epitaxial layer for sensing in the image sensor by one or more light of the light of fingerprint reflection Electric transition region.For example, the PD in above-described embodiment can be formed in photoelectric conversion regions by ion implantation technology.As Embodiment is changed, various types of photo-electric conversion elements, such as phototransistor, light can be formed in photoelectric conversion regions Grid, fixed PD etc..
Simultaneously as realizing fingerprint sensor using FSI methods, therefore one can be formed on the epitaxial layer for forming PD Or multiple metal levels.In fig. 14 it is shown that forming five metal level M1 to M5 example, and metal level M1 can be realized extremely The dielectric for being used to be electrically insulated between M5.As example embodiment, dielectric can be formed as interlayer dielectric or alternating layers The form of dielectric (ILD) or inter-metal dielectric (IMD), and the insulating device based on oxide or nitride can be used As dielectric.Further, it is also possible to metal wire and contact are formed in each of metal level M1 to M5.
Meanwhile chip 620A is maintained to be arranged in metal level M1 to M5.Maintain chip 620A can be used for keep or Support epitaxial layer.According to the example embodiment of present inventive concept, the pin hole formed in chip 620A is maintained, which can be formed, to be referred to Line reflects and the focus of the light of transmission.Fingerprint sensor 600A including device wafer 610A and maintenance chip 620A can be sealed Fill and be attached to a surface of display panel, and can be in a manner of the packaging technology identical with being shown in above-described embodiment To perform fingerprint sensor 600A packaging technology.Furthermore, it is possible to a variety of installation methods are applied to the fingerprint sensor of encapsulation 600A.For example, the fingerprint sensor 600A of encapsulation can be installed on the board in the form of COB, or the fingerprint sensor of encapsulation 600A can be arranged on film in the form of COF.Although for the ease of Figure 14 explanation, display panel is shown as to be arranged in dimension Hold on chip 620A, but the fingerprint sensor 600A encapsulated can substantially be adhered to by the attaching components in above-described embodiment To display panel.
In addition, shown in Figure 14 at least one layer be further disposed metal level M1 to M5 with maintain chip 620A it Between example.For example, one or more layers of the arrangement by realizations such as silicon nitrides (SiCN), therefore maintain chip 620A to stack Thereon.In addition, for example, it can be adjusted differently than maintaining chip 620A transparency.According to above-described embodiment, will can have For reducing the materials application of its light transmittance in maintaining chip 620A on the chip with silicon materials to realize.
According to the fingerprint sensor 600A realized as described above, during imaging sensor is realized, with pinhole mask Corresponding maintenance chip 620A can be stacked on device wafer 610A.Therefore, can in the packaging technology of imaging sensor To omit the technique for stacking single layer of pinholes on the image sensor.In addition, in the fingerprint sensor package of encapsulation, due to The single retainer for fixing layer of pinholes need not be provided, it is possible to reduce the whole thickness of fingerprint sensor package.
Figure 15 is to show back side illumination (BSI) type fingerprint sensor according to an example embodiment of present inventive concept Sectional view.In the structure for describing the fingerprint sensor 600B shown in Figure 15, configuration same as shown in Figure 14 will be omitted It is described in detail.
With reference to figure 15, can be realized according to the fingerprint sensor 600B of the present embodiment using BSI methods.For example, fingerprint Sensor 600B can include realizing the device wafer 610B for having imaging sensor and the maintenance crystalline substance on device wafer 610B Piece 620B.Furthermore, it is possible to form multiple pin holes in chip 620B is maintained.
As example embodiment, due to realizing the imaging sensor in fingerprint sensor 600B, institute using BSI methods Layer (for example, epitaxial layer) in image taking sensor formed with PD can be located at maintain chip 620B and metal level M1 to M5 it Between.Therefore, reflected by fingerprint and can be not passed through metal level M1 to M5 feelings through the light for the pin hole for maintaining chip 620B PD is provided under condition.In addition, for the support with above-mentioned maintenance chip or keep the independent of the same or analogous function of function Chip can be arranged below metal level M1 to M5 in the accompanying drawings.
Similar to the above embodiments, maintaining chip 620B multiple pin holes can form by the light of fingerprint reflection and transmission Focus.In the embodiment shown in fig. 15, due to realizing imaging sensor using BSI methods, therefore chip 620B pin is maintained The distance between hole and PD can be less than the distance in the embodiment shown in Figure 14, therefore realize the method (example of imaging sensor Such as FSI methods, BSI methods) size of sensor pixel can be influenceed.
Figure 16 is to show that the fingerprint sensor package including the layer of pinholes with embedded structure is attached to display surface The figure of the example of plate.Although shown in Figure 16 attaching components as described above there is plane form and fingerprint sensing system with COB forms installation example, but apply have the layer of pinholes with embedded structure fingerprint sensing system can by it is various its His method is realized.
With reference to figure 16, fingerprint sensing system 700 can include fingerprint sensor package 710, display panel 720 and plate 730. In addition, fingerprint sensor package 710 can include package substrate 711, the imaging sensor 712 on package substrate 711 With moulded parts 713.In addition, fingerprint sensor package 710 can be attached to display panel 720 by attaching components 714.
Imaging sensor 712 can include optical receiving region 712_1 and logic region 712_2.Optical receiving region 712_1 can To be realized according to above-described embodiment shown in Figure 14 or Figure 15, therefore optical receiving region 712_1 can be included in image sensing It is stacked in device technique on PD and there is the maintenance chip of multiple pin holes.In addition, logic region 712_2 can be by from light Receiving area 712_1 electric signal carries out logical process to produce view data, and by package substrate 711 by caused image Data are supplied to plate 730.In said structure, according to this embodiment, it can be omitted in imaging sensor 712 in packaging technology The upper technique for stacking pinhole mask.
Figure 17 to Figure 24 is the fingerprint sensor package for showing at least some example embodiments according to present inventive concept Various structures figure.Although for the ease of description in Figure 17 to not shown in Figure 24, according to above-mentioned example embodiment Pinhole mask can arrange on the image sensor in the form of outside fingerprint sensor package, or can be implemented as The layer for being used to perform pinhole mask function of above-mentioned maintenance chip etc. can be embedded in the image sensor.
Imaging sensor included in fingerprint sensor can include：Optical receiving region, sense the light reflected by fingerprint And produce the electric signal corresponding with light；And logic region, by being carried out to the electric signal from optical receiving region at logic Manage to produce view data.According to an example embodiment, optical receiving region and logic region can be manufactured to Bu Tong half Single chip (for example, chip in wafer cell) on conductor substrate, and the sensor chip including optical receiving region It can be encapsulated in a semiconductor packages with the logic chip including logic region.Alternatively, optical receiving region and logic area Domain can manufacture on a semiconductor substrate and be encapsulated in image sensor chip.According to above-described embodiment, single pin Aperture mask (not shown) can be stacked on sensor chip in packaging technology.Alternatively, according to above-mentioned embodiment, with In the semiconductor technology of manufacture sensor chip, the maintenance chip formed with pin hole can be stacked on PD.
Hereinafter, for the ease of description, when describing the feature of example embodiment of present inventive concept, may be referred to The example of optical receiving region and logic region is manufactured in same substrate.Therefore, optical receiving region (or sensor region) and logic Chip of the region manufacture on same semiconductor substrate is properly termed as image sensor chip.However, the example of present inventive concept Embodiment is not limited to such term.The chip of e.g., including both sensor region and logic region is properly termed as sensor Chip.
With reference to the fingerprint sensor package 800 of figure 17, image sensor chip 801 may be mounted at package substrate encapsulation On PCB.Because the sensor region 810 and logic region 850 that are included in image sensor chip 801 are tied without stacking Structure, so one or more layers can be with the same plane.Alternatively, when sensor region 810 and logic region 850 are made Make for single chip when, the chip may be mounted at package substrate encapsulation PCB on same plane on.In addition, Figure 17's Show that sensor region 810 and logic region 850 are electrically connected to the example of package substrate by closing line 830 in embodiment.
Meanwhile shown in Figure 17 example embodiment and sensing is realized by FSI methods in above-mentioned example embodiment The example in device region 810, therefore, sensor region 810 can include multiple PD and the formation formed in semiconductor substrate 811 There are metal wire 812_1 one or more metal levels 812.In addition, layer of pinholes (not shown) can be passed through by the light that fingerprint reflects PD is transmitted to metal level 812.
Fingerprint sensor package 800 can be installed according to above-described embodiment in the form of CoB.Can be the one of package substrate Formed on individual surface for being passed between the sensor region 810 and logic region 850 and plate 820 of fingerprint sensor package 800 The connection terminal of defeated signal, and show that multiple soldered balls 840 are attached to a table of package substrate in Figure 17 embodiment The example in face.
Simultaneously as sensor region 810 is realized by FSI methods, thus be accordingly used in be electrically connected to the pad of outside can To be present in the top of sensor region 810, and in sensor region 810, metal wire 812_1 disposed thereon and encapsulation Substrate can be electrically connected by pad.For example, the pad and package substrate of sensor region 810 can by closing line 830 it One electrical connection.The electric signal of sensor region 810 in fingerprint sensor package 800 can be provided to logic region 850, and the view data from logic region 850 can be supplied to external system by soldered ball 840 and plate 820.
Figure 18 shows another example that image sensor chip is arranged on package substrate.Passed in the image shown in Figure 18 In sensor chip 901, show and sensor region 910 is realized by BSI methods according to above-described embodiment and pacified in the form of CoB Fill the example of fingerprint sensor package 900.
With reference to figure 18, the image sensor chip 901 of fingerprint sensor package 900 includes sensor region 910 and logic Region 950.Because sensor region 910 is realized by BSI methods, therefore the semiconductor substrate 911 formed with multiple PD can It can be located at one or more metal levels 912 on sensor region 910, and formed with metal wire 912_1 under PD Side.In addition, pad can be located at the bottom of sensor region 910.For example, sensor region 910 can pass through pad and connection Terminal (for example, projection 930) is electrically connected to a surface of package substrate.In addition, the electric signal from sensor region 910 can Plate 920 is transferred to connection terminal (for example, soldered ball 940) by projection 930 and another surface for being attached to package substrate.
According to above-described embodiment, because sensor region and logic region are tied in fingerprint sensor package without stacking Structure, therefore the thickness of fingerprint sensor package can reduce.In addition, as shown in figure 18, in the embodiment of application BSI methods, Because sensor region 910 can be connected to package substrate in the case of without using closing line by projection 930, therefore can be with Prevent the thickness of fingerprint sensor package 900 increases due to sensor region 910.
Figure 19 and Figure 20 is the fingerprint sensor package for showing the structure with sensor chip and logic chip stacking Example embodiment block diagram.In Figure 19 and Figure 20, show and manufacture sensor chip on single semiconductor substrate With the example of logic chip.In addition, showing the example that sensor chip is realized by FSI methods in Figure 19, shown in Figure 20 Realize by BSI methods the example of sensor chip.In addition, as described above, although for ease of explanation, in Figure 19 and Figure 20 In eliminate the pinhole mask of example embodiment according to present inventive concept, but pinhole mask can be with according to above-described embodiment Outside installation or embedded mode realize and be arranged in fingerprint sensor package.
With reference to figure 19, fingerprint sensor package 1000 can include sensor chip 1010 formed with PD and formed with patrolling The logic chip 1020 of circuit is collected, and sensor chip 1010 and logic chip 1020 can have in fingerprint sensor package There is stacked structure 1000.The example that sensor chip 1010 is realized by FSI methods is shown in Figure 19.Therefore, formed with more Individual PD semiconductor substrate 1011 can be located at the bottom of sensor chip 1010, and one or more metal levels 1012 can be with Positioned at the top of sensor chip 1010.
According to an example embodiment, in fingerprint sensor package 1000, sensor chip 1010 can be stacked on and patrol Collect on chip 1020.Sensor chip 1010 can sense the light by fingerprint reflection to produce electric signal, and electric signal can be with It is supplied to by forming the metal wire in the upper metal level of one or more of sensor chip 1010 metal level 1012 Logic chip 1020.According to an example embodiment, can be formed in sensor chip 1010 from sensor chip 1010 At least one metal level passes through the rear via stack (BVS) 1060 of the semiconductor substrate 1011 of sensor chip 1010, and comes Logic chip 1020 can be supplied to by BVS 1060 from the electric signal of sensor chip 1010.
Meanwhile logic chip 1020 can include be used for handle electric signal with produce the various circuits of view data and For realizing multiple metal levels of various logic circuit.The electric signal transmitted by BVS 1060 can be provided to logic chip At least one metal level in 1020.
Logic chip 1020 may be mounted on package substrate encapsulation PCB and be electrically connected to package substrate.Shown according to one Example embodiment, one or more metal levels can be stacked on the semiconductor substrate of logic chip 1020, and therefore pass through position Package substrate is electrically connected in the pad at the top of logic chip 1020.For example, logic chip 1020 can by pad and Closing line 1040 is electrically connected to package substrate.
Fingerprint sensor package 1000 can be arranged on plate 1030 in the form of CoB.For example, logic chip 1020 can lead to Cross soldered ball 1050 and be connected to plate 1030.In addition, logic chip 1020 be able to will be schemed by package substrate, soldered ball 1050 and plate 1030 As data are supplied to external system (for example, equipment for reconfiguring fingerprint).
Embodiment according to Figure 19, when the sensor chip 1010 formed with PD and the logic formed with logic circuit When there is chip 1020 stacked structure and sensor chip 1010 to be realized by FSI methods, due to the He of sensor chip 1010 Logic chip 1020 can be connected by BVS 1060, therefore in the stacked structure of sensor chip 1010 and logic chip 1020 The increase of thickness of fingerprint sensor package 1000 can be minimized.Simultaneously as even if when logic chip 1020 passes through When closing line 1040 is connected to package substrate, sensor chip 1010 is also stacked on logic chip 1020, therefore due to engagement The thickness increase of fingerprint sensor package 1000 can not occur caused by line 1040 itself.
In addition, according to sensor chip 1010 and the stacked structure of logic chip 1020, due to fingerprint sensor package The whole fingerprint of 1000 identification fingers, therefore the region that should sense the sensor chip 1010 of the light reflected by fingerprint can phase To big, but can be prevented from the region of fingerprint sensor package 1000 due to the logic circuit in addition to sensor chip 1010 and Increase.
Meanwhile the sensor chip 1110 with stacked structure can be included with reference to figure 20, fingerprint sensor package 1100 With the logic chip 1120 formed with logic circuit, and sensor chip 1110 can be realized by BSI methods.Therefore, Semiconductor substrate 1111 formed with multiple PD can be located at sensor chip 1110 on, and one formed with metal wire or Multiple metal levels 1112 can be located at the lower section of semiconductor substrate 1111.
Meanwhile logic chip 1120 can include being used to handle the electric signal from sensor chip 1110 to produce The various circuits of raw view data, and for realizing that multiple metal levels of various circuits can stack on a semiconductor substrate. In addition, logic chip 1120 may be mounted on package substrate, and fingerprint sensor package 1100 can pass through soldered ball 1150 It is connected to plate 1130.In addition, the pad of logic chip 1120 may reside in top, and logic chip 1120 and package substrate It can be electrically connected to each other by closing line 1140.
Meanwhile when sensor chip 1110 is realized by BSI methods, the metal level 1112 of sensor chip 1110 is located at Its underpart, and the metal level portion disposed thereon of logic chip 1120.In this case, the metal wire of sensor chip 1110 The metal wire of (for example, metal wire of orlop metal level) and logic chip 1120 (for example, metal wire of topmost metal layer) It can be electrically connected by silicon hole (TSV) 1160.For example, it can be arranged between sensor chip 1110 and logic chip 1120 The individual course 1170 of intermediary layer etc., and caused electric signal can be by through individual course in sensor chip 1110 1170 TSV 1160 and be supplied at least one metal level in logic chip 1120.
Embodiment according to Figure 20, sensor chip 1110 and logic chip 1120 can be without using closing lines In the case of electrically connected by TSV 1160, therefore thickness in the stacked structure of sensor chip 1110 and logic chip 1120 increases Adding to be minimized.
Figure 21 A to Figure 24 are the block diagrams for showing the example embodiment that fingerprint sensor package is installed in the form of COF.When When COF forms are applied into fingerprint sensor package, fingerprint sensor package can be straight by the connection terminal of projection etc. Film is connected in succession.That is, in Figure 21 A into the embodiment shown in Figure 24, sensor chip or logic chip can pass through One or more connection terminals are directly connected on film, without being installed on single package substrate.
Meanwhile Figure 21 A, Figure 21 B and Figure 22 show sensor region and logic region manufacture in same semiconductor substrate On situation, and Figure 23 and Figure 24 show sensor chip and logic chip in semiconductor packages with stacked structure Situation.
With reference to figure 21A, the image sensor chip 1201 of fingerprint sensor package 1200 can include sensor region 1210 and logic region 1250, and sensor region 1210 can be realized by FSI methods.Sensor region 1210 can be with It is included in the multiple PD formed in semiconductor substrate 1211 and is stacked on one or more metal levels 1212 thereon.In addition, can To form pad at the top of image sensor chip 1201, therefore sensor region 1210 can pass through the company of projection etc. Connecting terminal and be electrically connected to film 1220.Sensor region 1210 can sense the light transmitted through metal level 1212, and will be based on The electric signal of sensing result is supplied to film 1220.
In such embodiments, sensor region 1210 can be attached to display panel (not shown), while be located at film 1220 lower sections, therefore PD can be supplied to by film 1220 and one or more metal levels 1212 by the light that fingerprint reflects.Root , as illustrated in fig. 21b, can (or light passes therethrough in the region corresponding with the PD in film 1220 according to an example embodiment Region) in formed hole 1221.Fingerprint sensor package 1200 may be coupled to film 1220 so that be formed in semiconductor substrate 1211 On PD be located at the region corresponding with the hole 1221 formed in film 1220.In addition, in order to by the transmission signal of film 1220, can To form wiring 1222 at least one surface of film 1220, and the cloth through two surfaces of film 1220 can be formed Line.In addition, film 1220 can include being used for the connector 1223 for being connected to other equipment or system.
Meanwhile sensor regions can be included with reference to figure 22, the image sensor chip 1301 of fingerprint sensor package 1300 Domain 1310 and logic region 1350, and sensor region 1310 can be realized by BSI methods.
Because sensor region 1310 is realized by BSI methods, therefore the semiconductor substrate 1311 formed with multiple PD It can be located on image sensor chip 1301, and one or more metal levels formed with metal wire 1312_1 can be located at The lower section of semiconductor substrate 1311.In addition, the pad of image sensor chip 1301 can be located at bottom, therefore sensor region 1310 one or more time metal wire can be electrically connected to film 1320 by pad and connection terminal (for example, projection 1330). According to an example embodiment, sensor region 1310 can be attached to display panel (not shown), while under film 1320 Side, therefore PD can be provided directly to by the light that fingerprint reflects, without through film 1320 or metal level 1312.
Embodiment according to Figure 22, due to being provided to by the light that fingerprint reflects in the case of not by film 1320 PD, therefore film 1320 need not have the single hole for propagation path of light.
In Figure 23 and Figure 24, show that sensor chip and logic chip have stacked structure and apply COF side The example embodiment of the fingerprint sensor package of method.
With reference to figure 23, fingerprint sensor package 1400 can include sensor chip 1410 and logic chip 1420, and Sensor chip 1410 can be realized by FSI methods.In addition, logic chip 1420 can include multiple metal levels, with reality It is current in the logic circuit that logical process is carried out to the electric signal from sensor chip 1410 to produce view data, and pass Sensor chip 1410 and logic chip 1420 can be electrically connected to each other due to such structure by BVS 1440.
Meanwhile in fingerprint sensor package 1400, logic chip 1420 may be electrically connected to film 1430, therefore logic core Piece 1420 can produce view data based on the electric signal from sensor chip 1410, and caused view data is sent to Film 1430.For example, multiple metal levels of logic chip 1420 can stack on a semiconductor substrate, pad is located at logic chip 1420 top, therefore the metal wire formed at least one metal level (for example, metal layer at top) can pass through connection end Sub (for example, projection 1450) is connected to film 1430.That is, logic chip 1420 can be by BVS 1440 and in top-gold The metal wire formed in category layer receives the electric signal from sensor chip 1410, and electric signal is supplied into lower metal layer, And it can will pass through the metal wire and projection that are formed in metal layer at top by handling electric signal and caused view data 1450 and be sent to film 1430.
Embodiment according to Figure 23, it can be formed in film 1430 with alloing sensor chip 1410 therefrom The hole in the region passed through, and fingerprint sensor package 1400 can have sensor chip 1410 to be inserted into the hole of film 1430 Structure.Therefore, the fingerprint of the structure on film 1430 is stacked on sensor chip 1410 and logic chip 1420 in installation During sensor encapsulation 1400, its integral thickness can be reduced.
Meanwhile can include sensor chip 1510 and logic chip 1520 with reference to figure 24, fingerprint sensor package 1500, And sensor chip 1510 can be realized by BSI methods.In addition, logic chip 1520 can include multiple metal levels, For carrying out logical process to the electric signal from sensor chip 1510 to produce view data, and sensor chip 1510 and logic chip 1520 can be electrically connected to each other due to such structure by TSV 1540.Although do not show in Figure 24 Go out, but intermediary layer formed with TSV 1540 etc. can be arranged between sensor chip 1510 and logic chip 1520 Single layer (not shown).
Meanwhile in the above-described embodiments, at least one metal level (for example, metal layer at top) of logic chip 1520 The metal wire of formation can be electrically connected to film 1530 by projection 1550.To pass furthermore, it is possible to be formed and had in film 1530 The hole in the region that sensor chip 1510 can extend there through, and fingerprint sensor package 1500 can have sensor chip 1510 are inserted into the structure in the hole of film 1530.
Meanwhile in the above-described embodiments, film is connected to notwithstanding when the fingerprint sensor package with stacked structure When the example in hole, but present inventive concept not limited to this are formed in film.For example, as shown in figure 22, there is the upper of stacked structure State fingerprint sensor package and may be coupled to the film for not forming hole.In this case, when the region that sensor chip is located at Corresponding to fingerprint sensor package upper area when, the upper area of fingerprint sensor package can be attached to display panel On one surface.
Figure 25 is the figure for the fingerprint sensor for showing the example embodiment according to present inventive concept.In fig. 25, including For realizing that multiple layers of chip of sensor chip is shown as including the component in fingerprint sensor 1600.According to above-mentioned reality Example is applied, the logic chip (not shown) formed with logic circuit can be further set in fingerprint sensor 1600.
Fingerprint sensor 1600 can include the semiconductor substrate 1610 formed with PD and be stacked on semiconductor substrate 1610 On one or more metal levels 1620.In addition, the dielectric formed in the form of ILD or IMD can be arranged in metal level 1620 Between, and each metal level can include metal wire and contact.In addition, dielectric can use up can extend there through it is transparent Or trnaslucent materials is realized.
, can be by arranging metal wire without in fingerprint sensor in metal level 1620 according to an example embodiment Layer of pinholes is independently formed in 1600 to realize the function of pin hole.For example, when the biography that fingerprint sensor 1600 is realized by FSI methods , can be by metal level 1620 by by the optical transport that fingerprint reflects to PD during sensor chip.In this case, due in metal The metal wire formed in layer is realized by the impenetrable material of light, it is possible to by the space between metal wire come transmission light. According to above-described embodiment, the diameter and height of pin hole may be used as determining the parameter of fingerprint pixel and the size of sensor pixel, And metal wire can be formed so that the function similar to the pin hole in above-described embodiment is performed by the space between metal wire (for example, function by the luminance transmission of reflected light to PD).
Figure 26 is the structure for the fingerprint sensor package for showing at least one example embodiment according to present inventive concept Figure.
With reference to figure 26, fingerprint sensor package 1700 can include package substrate 1710, on package substrate 1710 Imaging sensor 1720 and the moulded parts 1730 corresponding with cap.In addition, imaging sensor 1720 can include passing Sensor chip and logic chip, and imaging sensor 1720 can be electrically connected to envelope by the connecting element of closing line etc. Fill substrate 1710.
, can be positioned at image in the moulded parts 1730 of fingerprint sensor package 1700 according to an example embodiment One or more holes 1731 are formed in region on sensor 1720.For example, the molding on fingerprint sensor package 1700 The thickness of part 1730 can have the value for the focus for being suitable for forming the light according to above-described embodiment, and shape in moulded parts 1730 The region of pore-forming 1731 can correspond to the region formed with PD (not shown) in imaging sensor 1720.According to an example reality Example is applied, moulded parts 1730 can be realized using the element with low transmissivity.For example, moulded parts 1730 can use such as asphalt mixtures modified by epoxy resin The epoxy resin of fat moulding compound (EMC) is realized.
The fingerprint sensor package 1700 realized as shown in figure 26 can be attached to display panel in a variety of ways.For example, Fingerprint sensor package 1700 can be attached to display panel by the transparent or semitransparent attaching components with plane form.It is standby Selection of land, for example, fingerprint sensor package 1700 can pass through transparent, the translucent or opaque bonding member with window frame form Part is attached to display panel.Alternatively, for example, the height of the fringe region in the moulded parts 1730 of fingerprint sensor package 1700 The height in the region formed with hole 1731, therefore the fringe region of the moulded parts 1730 of fingerprint sensor package 1700 can be more than Display panel can be attached to.
Figure 27 is the figure of the structure for the fingerprint sensor package for showing another example embodiment according to present inventive concept.
With reference to figure 27, fingerprint sensor package 1800 can include package substrate 1810, on package substrate 1810 Imaging sensor 1820 and the pinhole mask 1840 on imaging sensor 1820.In addition, for supporting pinhole mask 1840 support member 1830 can be formed on imaging sensor 1820.In the same or a similar manner, image sensing Device 1820 can include sensor chip and logic chip, and can be formed in fingerprint sensor package 1800 and cap Corresponding moulded parts.In addition, fingerprint sensor package 1800 can be attached to the display surface of the light source including OLED etc. Plate.
According to an example embodiment, fingerprint sensor package 1800 can also include luminous intensity enhancing microlens array 1850.Microlens array 1850 can be located at the top of fingerprint sensor package 1800, and can include with being included in pin hole The corresponding multiple lenticules of multiple pin holes in mask 1840.It is multiple micro- e.g., including in microlens array 1850 Mirror can be aligned with pin hole.In addition, the moulded parts of the fringe region in fingerprint sensor package 1800 may be used as supporting The unit of microlens array 1850.For example, microlens array 1850 can be attached on the moulded parts of fringe region.
Structure according to Figure 27, the light launched from the light source (for example, OLED) of display panel can be reflected by fingerprint And imaging sensor 1820 is transmitted to by microlens array 1850 and pinhole mask 1840.In this case, in optical transport Into the path of imaging sensor 1820, the focus of microlens array 1850 can be formed, and pinhole mask can be formed 1840 focus.That is, by this structure, the light collected by microlens array 1850 can be transferred to pinhole mask 1840, and the light quantity sensed by imaging sensor 1820 can increase.
Further, since two focuses are formed in the propagation path of light to imaging sensor 1820, so working as through focus Shi Fasheng image inversion occurs twice, therefore the image sensed by imaging sensor 1820 can correspond to original fingerprint figure Picture.In addition, when the distance between fingerprint pixel and pinhole mask 1840 are larger, the diameter of pin hole is smaller with its thickness. However, according to example embodiment, because microlens array 1850 produces concentration effect, and pinhole mask 1840 makes from abutting The light of the lenticule of microlens array 1850 is by the way that therefore the visual angle of pin hole can increase.That is, according to embodiment, by In that can loosen to for realizing the thickness of pin hole and the process conditions of its diameter ratio, so the thickness of pinhole mask 1840 can To reduce.Therefore, it can be easier the manufacturing process of pinhole mask 1840.
Meanwhile when pinhole mask 1840 with opaque element to realize when, pinhole mask 1840 can be also used for stopping saturating Penetrated other light (that is, light unrelated with fingerprint sensing) in the region in addition to microlens array 1850.
In addition, according to an example embodiment, the lenticule of microlens array 1850 can be positioned as and pinhole mask Sensor pixel of 1840 pin hole together with imaging sensor 1820 is aligned.According to an example embodiment, when lenticule battle array When the lenticule of row 1850 is not aligned with sensor pixel, imaging sensor 1820 can be with software to lenticule and sensor picture Skew between element performs compensating operation.For example, sensor pixel can include multiple PD (or multiple sub-pixels), can pass through Sensing is transferred to the light of sensor pixel to determine the center of pin hole, can perform migration operation with software, therefore can be with Produce the electric signal (or corresponding view data) corresponding with situation about being aligned in sensor pixel with the center of pin hole.
Although in the above-described embodiments pinhole mask 1840 will be made to be attached to imaging sensor 1820 in packaging technology The method that example is shown as outside installation, but various modifications can be carried out to the embodiment.For example, using microlens array In 1850 above-described embodiment, pinhole mask 1840 can be embedded in image in the technique for realizing imaging sensor 1820 and passed In sensor 1820.According to above-described embodiment, the maintenance chip with multiple holes can perform pinhole mask 1840 with embedded mode Function.
In addition, Figure 26 and Figure 27 fingerprint sensor package 1700 and 1800 can be according to above-described embodiment in the form of COB It is installed on the board.Alternatively, fingerprint sensor package 1700 and 1800, which may be mounted at, is embedded with the film of wiring, and with COF forms form the hole with arbitrary shape (for example, big rectangular shape) so that light can be transmitted through the surface of sensor.
Figure 28 A to Figure 28 C are to show the fingerprint sense including the fingerprint sensor package for applying microlens array The figure of examining system.
With reference to figure 28A, fingerprint sensing system can include the fingerprint sensor package 1800 in above-described embodiment.In addition, Fingerprint sensing system can include being attached with the display panel 1801 of fingerprint sensor package 1800 and for installing fingerprint sensing The plate 1802 of device encapsulation 1800.Because microlens array 1850 is located at the top of fingerprint sensor package 1800, so lenticule Array 1850 can be attached to a surface of display panel 1801.Although not shown in Figure 28 A, microlens array 1850 A surface of display panel 1801 can be attached to by the attaching components with plane form or window frame form.
Meanwhile Figure 28 B and Figure 28 C show the light propagation road in the fingerprint sensor package 1800 of fingerprint sensing system Footpath.In Figure 28 B, the example of the position alignment of lenticule, pin hole and sensor pixel is shown.As shown in Figure 28 B, from conduct The light that the OLED of the light source of display panel 1801 is sent is reflected by the fingerprint of user, is transmitted on the direction towards backboard, and by It is supplied to microlens array 1850.Further, since microlens array 1850 and pinhole mask 1840 are arranged on fingerprint sensor envelope In filling 1800, so Jiao of the focus and the light formed by pinhole mask 1840 in the presence of the light formed by microlens array 1850 Point.Furthermore, it is possible to consider to determine the diameter of pin hole and height at a distance of shorter distance with microlens array 1850, and without examining Consider the distance between pin hole and the fingerprint of user.In the present embodiment, because the thickness of pin hole need not be larger with its diameter ratio, Therefore it is easy to the implementation of pinhole mask 1840.Alternatively, as shown in fig. 28 c, pin hole can be arranged to be located at lenticule institute shape Into focal spot height at.In this case, it is overall high from lenticule to sensor pixel compared with Figure 28 B embodiment Degree can reduce.
Figure 29 is to show the fingerprint sensor package for applying microlens array being arranged on to be embedded with the film of wiring Example figure.
With reference to figure 29, fingerprint sensing system 1900 can include fingerprint sensor package 1910, display panel 1920 and use In the film 1930 of installation fingerprint sensor package 1910.Fingerprint sensor package 1910 can include imaging sensor 1911, pin Aperture mask 1912 and microlens array 1913.Furthermore, it is possible in have mounted thereto the film 1930 of fingerprint sensor package 1910 The hole with the size for alloing fingerprint sensor package 1910 to extend there through is formed, and can be at least the one of film 1930 The wiring of the electrical transmission for signal is formed on individual surface.
According to an example embodiment, fingerprint sensor package 1910 can be attached to display panel by the hole of film 1930 1920.In addition, although not shown in Figure 29, but can further be provided for passing in fingerprint in fingerprint sensing system 1900 Sensor encapsulation 1910 is attached to the plane form of display panel 1920 or the attaching components of window frame form.In addition, imaging sensor 1911 can include optical receiving region and logic region, and when optical receiving region and logic region are implemented as single chip When, imaging sensor 1911 can include the sensor chip comprising optical receiving region and the logic chip comprising logic region. Imaging sensor 1911 can be electrically connected to film 1930 surface by engagement.
Figure 30 to Figure 32 is the figure for the fingerprint sensing system for showing the example embodiment according to present inventive concept.
With reference to figure 30, fingerprint sensing system 2000 can include the display panel 2010 comprising multiple OLED, formed with more The pinhole mask 2020 of individual pin hole and the imaging sensor 2030 including multiple sensor pixels.Each sensor pixel can wrap Include one or more PD.In addition, multiple OLED can be located in the oled layer of display panel 2010.
Multiple OLED of display panel 2010 can be the element for the light that spontaneous emission has different colours and wavelength band.Example Such as, display panel 2010 can include transmitting red (R) OLED, the OLED of transmitting blue (B) and transmitting green (G) OLED.When OLED transmittings have the light of different colours, the wavelength of the light of a variety of colors can have different values.
According to an example embodiment, it can operate with fingerprint sensing and relatively be selected in the OLED of transmitting multiple color Property using launch any one color OLED.For example, carrying out the OLED of spontaneous emission red (R) light can be reflected simultaneously by fingerprint Imaging sensor 2030 is supplied to by pinhole mask 2020.In this case, when relatively only being selected with fingerprint sensor Property when activating the OLED of transmitting red (R), it is not necessary to single colour filter is arranged in imaging sensor 2030.Alternatively, It can only realize that the red corresponding with the OLED for only optionally activating red (R) to light is filtered in imaging sensor 2030 Color device is as monochrome filter, to filter the only one color corresponding with multiple PD.That is, can be according to selected The color of light source, which uses, only makes the colour filter that same color passes through, or can not arrange colour filter in imaging sensor 2030 Device.
When using the OLED of transmitting multiple color, for the light of every kind of wavelength, it may occur that caused by aberration The difference of focusing length.In this case, because focus may not be concentrated at one, so the acutance of sensing result may Reduce.On the other hand, according to above-described embodiment, due to by the way that optionally there is identical ripple using transmitting only in multiple OLED The OLED of long light operates to perform according to the fingerprint sensing of the example embodiment of present inventive concept, therefore can be in a pin hole Unified focus is formed in multiple pin holes in mask, so as to improve the acutance of fingerprint sensing result.
Meanwhile Figure 31 A and Figure 31 B show another example of the raising sensing acutance such as above-mentioned embodiment.
With reference to figure 31A, fingerprint sensing system 2100 can include display panel 2110 and fingerprint sensor 2120, and refer to Line sensor 2120 can include pinhole mask 2121 and imaging sensor 2122.According to above-described embodiment, fingerprint sensor 2120 can be packaged and be attached to a surface of display panel 2110.
Pinhole mask 2121 can include multiple pin holes, and each pin hole can form the light for being reflected and being transmitted by fingerprint Focus.In addition, display panel 2110 can include OLED of the light without backlight of its own transmission multiple color, and can To carry out fingerprint sensing operation using the OLED for the light for launching at least some colors in multiple colors in OLED.
Imaging sensor 2122 can include the multiple sensor pixels corresponding with multiple pin holes, and each sensor Pixel can include one or more PD.In addition, according to an example embodiment, colour filter can be formed with corresponding to multiple biographies Each in sensor pixel, and (or the colour filter that the light with phase co-wavelength passes therethrough of identical colour filter can be formed Device) with corresponding to sensor pixel.In Figure 31 A embodiment, show PD in the image sensor top formed it is red Color colour filter CF_R is with the example corresponding to sensor pixel.
According to the embodiment shown in Figure 31 A, even if due to when the light of all OLED from display panel 2110 is by fingerprint During reflection, can also by imaging sensor 2122 for the monochrome filter filtered to same color, selecting The PD being only supplied to the light of same color (or phase co-wavelength) to property in sensor pixel, thus can with above-described embodiment Similarly improve the acutance of fingerprint sensing result.
Meanwhile in Figure 31 B, show the use according to an example embodiment of present inventive concept in sensor region Preceding surface and PD top formed colour filter technique example.
Meanwhile although showing the example that pinhole mask is provided in the form of outside install in the above-described embodiments, The pinhole mask with embedded structure in above-described embodiment can be provided.For example, in Figure 31 A and Figure 31 B embodiment, when When maintenance chip is stacked on the PD in imaging sensor 2122 to perform pinhole mask function, pin hole can be located at red color filter Between device CF_R and PD.
Meanwhile in Figure 32 A and Figure 32 B, show the increased example of spatial resolution in fingerprint sensor.
With reference to figure 32A and Figure 32 B, the sensor pixel corresponding with a pin hole can be divided into multiple sub-pixels. Show that a sensor pixel is divided into four sub-pixel SP1 to SP4 example in Figure 32 A, and shown in Figure 32 B One sensor pixel is divided into nine sub-pixel SP1 to SP9 example.In addition, in Figure 32 A and Figure 32 B sensor The part of circle is expressed as in pixel can correspond respectively to the optical sensing region of sensor pixel.In addition, each sub-pixel Electric signal can be produced according to the result of sensing light.
In order to additionally obtain the resolution ratio of fingerprint image, reduce the spacing of fingerprint pixel.Therefore, by reducing each pin hole Diameter reduce the visual angle of each pin hole, and reduce the spacing between pin hole.However, by reduce pin hole diameter or Away from limitation can be caused in a manufacturing process to improve resolution ratio.
The example embodiment of inventive concept according to Figure 32 A and 32B, can increase the resolution of fingerprint sensing result Rate, therefore can obtain with high-resolution fingerprint image.For example, it ought arrange in the image sensor relative with 2N pin hole The 2N sensor pixel answered, and when each sensor pixel is divided into 2M sub-pixel, can be according to from all 2N+M The sensing result of individual sub-pixel produces electric signal.It is even if relative with sensing result that is, due to arranging 2N pin hole The resolution ratio for the whole image data answered also corresponds to N+M bit, therefore the picture number in the case where not increasing pin hole quantity According to resolution ratio can increase M-bit.
With reference to figure 33, fingerprint sensing system 2200 can include display panel 2210 and processing system 2220.Display panel 2210 can include the touch panel TP including multiple OLED of cover-plate glass CG including multiple sensing units viewing area and Backboard BP.Touch panel TP may be arranged to sense the touch operation of user.For example, work as the touch applied using capacitive method During panel TP, touch panel TP can include the sensing unit that capacitance is changed based on the touch of user.
Processing system 2220 can include display driver circuit 2221, touch screen controller 2222 and fingerprint sensor 2223.Display driver circuit 2221 can perform the various control operations for realizing image on display panel 2210.For example, Display driver circuit 2221 can provide the gradation data related to image realization on display panel 2210.In addition, touch-screen Controller 2222 can be changed with the electric capacity of sensing touch panel TP sensing unit, to produce touch-sensing result.For example, touch Screen controller 2222 can provide the drive signal for driving touch panel TP, and in reception and processing and touch panel TP The electric capacity of sensing unit change corresponding electric signal.In addition, fingerprint sensor 2223 can correspond to above-mentioned various implementations Any of example, and as light source and sensed by using OLED by the light of the fingerprint reflection of user to produce fingerprint image Picture.
Meanwhile according to an example embodiment, processing system 2220 may be implemented as a semiconductor chip.For example, The function of display driver circuit 2221, touch screen controller 2222 and fingerprint sensor 2223 can be integrated in one it is semiconductor-based On plate.According to an example embodiment, fingerprint sensor 2223 may be implemented as being included in each described in above-described embodiment It is at least some in kind function.For example, when fingerprint sensor 2223 includes PD, fingerprint sensor 2223 can include light-receiving Region, or can also include being used for the logic region for producing the view data described in above-described embodiment.
According to an example embodiment, display driver circuit 2221, touch screen controller 2222 and fingerprint sensor 2223 It can be formed in same semiconductor chip, to send and receive various information or signal.For example, the behaviour of fingerprint sensor 2223 Work can be controlled by display driver circuit 2221 and/or touch screen controller 2222.For example, can be by display driver circuit 2221 and/or touch screen controller 2222 produce for sense sequential or sense fingerprint sensor 2223 operation required for work( Rate and control signal.
In the embodiment shown in Figure 33, show that display driver circuit 2221, touch screen controller 2222 and fingerprint pass Sensor 2223 is integrated into the example in single semiconductor chip, but inventive concept not limited to this.In showing for present inventive concept In example embodiment, fingerprint sensor 2223 can be realized in same semiconductor chip with display driver circuit 2221, or is referred to Line sensor 2223 can be realized in same semiconductor chip with touch screen controller 2222, or can be implemented as individually Semiconductor chip.
Meanwhile although describing some example embodiments applied to present inventive concept by reference to single accompanying drawing, It is that can be passed through according to the fingerprint sensor, fingerprint sensor package or fingerprint sensing system of the example embodiment of present inventive concept Two or more embodiments are combined to configure.
The technical scope of present inventive concept is used for most widely used fingerprint in the increased field of biological recognition of the market demand Identification field, and the structure for fingerprint sensor on the display of smart phone or wearable device is provided.For example, exist at present In most of smart phones, fingerprint sensor is mounted in the main screen button at the lower center of phone or the back side of phone. According to the example embodiment of present inventive concept, a kind of optical sensor structure can be provided, its Direct Recognition smart phone shows Show the fingerprint on device, without the fingerprint sensing in main screen button, positioned at the lower center of phone or the back side of phone Device.
In the optical fingerprint sensor, fingerprint sensor package and fingerprint sensing of the technical scope according to present inventive concept In system, due to the minimizing thickness of fingerprint sensor package can be made, it is possible to provide ultra-thin fingerprint sensing system.
In addition, in the optical fingerprint sensor of the technical scope according to present inventive concept, fingerprint sensor package and refer to In line sensing system, because the light source for being used to show operation set in display panel is used as being used to carry out optics to fingerprint The light source of sensing, therefore extra light source need not be added, so as to reduce manufacturing cost.
Although the embodiment with reference to present inventive concept specifically illustrates and described present inventive concept, should manage Solution, in the case of without departing from the spirit and scope of the appended claims, can be carried out various in form and details wherein Change.
1. a kind of fingerprint sensor, including：
Include the imaging sensor of multiple sensor pixels, the sensor pixel is configured as sensing by the light of fingerprint reflection simultaneously Produce the image information corresponding with the fingerprint；And
The pinhole mask of multiple pin holes is limited, each pin hole is formed for by by the light transmission that the fingerprint reflects to described image The focus of sensor, and the light is launched from multiple Organic Light Emitting Diode OLED and reflected by the fingerprint.
2. fingerprint sensor according to claim 1, wherein, described image sensor includes：
Photodiode PD in the multiple sensor pixel, the PD, which is configured as output, has described image information Electric signal；And
Logic circuit, it is configured as by carrying out signal transacting to the electric signal to produce view data, using caused View data produces fingerprint image, and exports the fingerprint image, and the logic circuit is located at and the PD points of positions opened.
3. fingerprint sensor according to claim 1, wherein, the fingerprint sensor is configured as sensing from the multiple OLED launches along the direction towards glass cover and by the fingerprint along from the glass cover towards the light of the direction of backboard reflection.
4. fingerprint sensor according to claim 3, wherein, described image sensor is configured as sensing the multiple Caused light in OLED, wherein the multiple OLED has multiple color.
5. fingerprint sensor according to claim 3, wherein, the pinhole mask is in OLED display panel and described image Between sensor, and the OLED display panel includes the multiple OLED.
6. fingerprint sensor according to claim 3, wherein, described image sensor includes colour filter, wherein with The light of the colour filter identical color optionally passes through the colour filter to reach pair in the multiple sensor pixel Part is answered, optionally to sense the light with same color and identical wavelength band among the multiple OLED.
7. fingerprint sensor according to claim 1, wherein：
The multiple sensor pixel corresponds respectively to the multiple pin hole；And
In each sensor pixel of one photodiode PD in the multiple sensor pixel.
8. fingerprint sensor according to claim 1, wherein：
In each sensor pixel of multiple photodiode PD in the multiple sensor pixel.
9. fingerprint sensor according to claim 1, wherein：
The pinhole mask is in described image sensor；
Described image sensor includes one or more metal levels on semiconductor substrate and the semiconductor substrate, wherein described Semiconductor substrate includes multiple photodiode PD；And
The pinhole mask includes one or more metal levels, and one or more of metal levels limit the multiple pin Hole, wherein the multiple pin hole is not formed in the region of metal wire in one or more of metal levels.
10. fingerprint sensor according to claim 1, wherein：
Described image sensor includes semiconductor substrate and one or more metal levels, wherein the semiconductor substrate is including multiple Photodiode PD；And
The pinhole mask is on the semiconductor substrate or one or more of metal levels.
11. fingerprint sensor according to claim 1, wherein, the fingerprint sensor is semiconductor packages, the pin hole On a semiconductor die, the semiconductor chip includes described image sensor to mask, and the fingerprint sensor also includes：
Support member on the semiconductor chip, pinhole mask described in the supports support.
12. a kind of fingerprint sensing system, including：
Display panel including light source, the light source, which is configured as relatively launching with display operation, has one or more colors Light；
Imaging sensor, is attached to a surface of the display panel, and is configured as sensing from the light source and by position In the light of the fingerprint reflection on another surface of the display panel, described image sensor is configured as being produced according to sensing result Raw image information；And
Pinhole mask between the display panel and described image sensor, the pinhole mask have multiple pin holes, institute The focus that multiple pin holes are used to form the light reflected by the fingerprint is stated,
Wherein, in fingerprint sensing operation, described image sensor sensing is with some face in one or more colors The light of color simultaneously produces described image information.
13. fingerprint sensing system according to claim 12, wherein, in fingerprint sensing operation, the display surface Plate optionally activates one in the light source.
14. fingerprint sensing system according to claim 12, wherein：
In fingerprint sensing operation, a part for the display panel activation light source, described one of the light source The light with least one of one or more colors color is penetrated in distribution；And
Described image sensor includes being used for optionally sensing with any one color at least one color The colour filter of light.
15. fingerprint sensing system according to claim 12, wherein, the display panel is including being used as the light source Multiple Organic Light Emitting Diode OLED OLED display panel.
16. a kind of sensing system, including：
Display panel, it is configured as producing light and receives the reflected light based on caused light；And
Sensor, the sensor include：
Limiting the mask in multiple holes, the mask is configured as guiding the Part I of the reflected light by the mask, its Described in mask the first side on said display panel, and
Imaging sensor on second side of the mask, described image sensor includes multiple sensor pixels, the multiple Sensor pixel is configured as sensing the Part I of the reflected light and produces electric signal based on the light sensed, its Described in mask be configured as that the Part I of the reflected light is directed into the figure in the case where not needing lens As sensor.
17. sensing system according to claim 16, wherein the mask includes：
Include the first layer of the first metal line, and
Including the second layer of the second metal line, first metal line is vertical with second metal line, and described first Metal line and second metal line are configured as the Part II for stopping the reflected light.
18. sensing system according to claim 17, wherein the first layer and the second layer are limited and covered through described The hole of mould.
19. sensing system according to claim 16, wherein the display panel includes being configured as caused by generation Multiple Organic Light Emitting Diode OLED of light.
20. sensing system according to claim 16, wherein the mask is adjacent with described image sensor.
CN201710548786.4A 2016-07-06 2017-07-06 Fingerprint sensor and fingerprint sensing system CN107590428A (en)
KR20160085697 2016-07-06
KR10-2016-0085697 2016-07-06
KR10-2016-0100360 2016-08-05
KR20160100360 2016-08-05
KR1020160184352A KR20180005588A (en) 2016-07-06 2016-12-30 Fingerprint Sensor, Fingerprint Sensor Package and Fingerprint Sensing System using light sources of display panel
KR10-2016-0184352 2016-12-30
CN107590428A true CN107590428A (en) 2018-01-16
ID=59315406
CN201710548786.4A CN107590428A (en) 2016-07-06 2017-07-06 Fingerprint sensor and fingerprint sensing system
US (1) US20180012069A1 (en)
EP (1) EP3267359A1 (en)
CN (1) CN107590428A (en)
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2017-07-05 EP EP17179749.1A patent/EP3267359A1/en active Pending
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