CN111164608B - Fingerprint identification device and electronic equipment - Google Patents
Fingerprint identification device and electronic equipment Download PDFInfo
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- CN111164608B CN111164608B CN201980004113.XA CN201980004113A CN111164608B CN 111164608 B CN111164608 B CN 111164608B CN 201980004113 A CN201980004113 A CN 201980004113A CN 111164608 B CN111164608 B CN 111164608B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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Abstract
The embodiment of the application discloses a fingerprint identification device and electronic equipment, which can filter out light signals of red light wave bands and infrared wave bands in finger return light signals so as to avoid affecting fingerprint identification of a fingerprint sensor. The fingerprint identification device is suitable for electronic equipment with a display screen, and is arranged below the display screen, and comprises an optical filter, an absorption layer, an optical path guiding structure and a fingerprint sensor; the fingerprint sensor comprises an induction array with a plurality of optical induction units, wherein the induction array is used for receiving a return light signal returned by a finger above the display screen and passing through the optical filter, the absorption layer and the light path guiding structure, and generating a fingerprint image of the finger according to the return light signal; the optical filter is used for filtering optical signals of infrared wave bands in the return optical signals; the absorption layer is used for absorbing the optical signals of the red light wave band in the return optical signals; the optical path guiding structure is used for guiding the return optical signal to the fingerprint sensor.
Description
Technical Field
The embodiment of the application relates to the field of fingerprint identification, and more particularly relates to a fingerprint identification device and electronic equipment.
Background
With the rapid development of the mobile phone industry, fingerprint identification technology is more and more paid attention to, and the practical application of the under-screen fingerprint identification technology is required by the public. The most applied among the fingerprint identification technology under the screen is the optical fingerprint identification technology under the screen, and the optical fingerprint identification technology under the screen can adopt the light that the screen sent as the light source, can carry the fingerprint information of finger after the light that the screen sent shines the finger above the screen, and the optical signal that carries fingerprint information can be received by fingerprint sensor to carry out fingerprint identification.
However, if fingerprint identification is performed in outdoor sunlight, light in red light and infrared wave bands in the sunlight can directly penetrate through the finger to reach the fingerprint sensor, so that a light signal with fingerprint information is annihilated in background noise of the red light and the infrared light, and the fingerprint sensor is disabled. Therefore, how to filter out the light signals of the red light and the infrared light bands in the fingerprint identification process is a problem to be solved.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification device and electronic equipment, which can filter light signals of red light and infrared wave bands in sunlight so as to avoid the influence of the sunlight on fingerprint identification.
In a first aspect, a fingerprint identification apparatus is provided, suitable for an electronic device having a display screen, the fingerprint identification apparatus is configured to be disposed below the display screen, and the fingerprint identification apparatus includes an optical filter, an absorption layer, an optical path guiding structure, and a fingerprint sensor; the fingerprint sensor comprises an induction array with a plurality of optical induction units, wherein the induction array is used for receiving a return light signal returned by a finger above the display screen and passing through the optical filter, the absorption layer and the light path guiding structure, and generating a fingerprint image of the finger according to the return light signal; the optical filter is used for filtering optical signals of infrared wave bands in the return optical signals; the absorption layer is used for absorbing the optical signals of the red light wave band in the return optical signals; the optical path guiding structure is used for guiding the return optical signal to the fingerprint sensor.
In the technical scheme provided by the embodiment of the application, the optical filter can be used for filtering the infrared band optical signal in the optical signal returned by the finger, and the absorption layer can be used for absorbing the red band optical signal in the optical signal returned by the finger, so that the red signal and the infrared signal reach the fingerprint sensor without affecting the fingerprint identification performance of the fingerprint sensor. In addition, the red light signal is absorbed by the absorption layer, so that the red light signal cannot enter human eyes, and the display screen is attractive.
In some possible implementations, the absorbing layer is coated on an upper surface and/or a lower surface of the filter.
In some possible implementations, the absorbing layer is coated on any surface of the light path guiding structure.
In some possible implementations, the absorbing layer is coated on an upper surface of the sensing array of the fingerprint sensor.
In some possible implementations, the optical filter is configured to reflect the optical signal in the infrared band with the absorbing layer disposed over the optical filter.
In some possible implementations, the optical filter is configured to reflect the optical signal in the infrared band and transmit the optical signal in the red band, with the absorbing layer disposed below the optical filter.
When the absorption layer is arranged below the optical filter, the optical filter not only needs to reflect infrared light, but also needs to transmit red light so as to prevent the red light from entering human eyes to influence the attractiveness of the display screen.
In some possible implementations, the return light signal includes a light signal emitted by the display screen that is reflected or scattered by the finger.
In some possible implementations, the absorption layer absorbs more than 85% of the red band optical signal.
In some possible implementations, the absorption layer and the filter have a transmittance of greater than 80% for both blue and green light band optical signals.
The absorption layer and the optical filter can transmit blue light and green light so as to ensure the intensity of an optical signal for fingerprint identification.
In some possible implementations, the thickness of the absorbing layer is less than 2 μm.
In some possible implementations, the filter includes a single layer film or a multilayer film coated on a substrate.
In some possible implementations, the optical filter includes a single-layer film or a multi-layer film coated on any one of the optical path guiding structure and/or the upper surface of the fingerprint sensor.
In some possible implementations, the material used for the absorbing layer is a polymer film material or a polymer film material.
In some possible implementations, the absorbing layer is coated on any surface of the optical filter, the optical path guiding structure and/or the upper surface of the fingerprint sensor by a dry film laminating or spin-coating baking mode.
In a second aspect, there is provided an electronic device comprising: a display screen, and a fingerprint recognition device in the first aspect and any possible implementation manner thereof.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device used in an embodiment of the present application.
Fig. 2 is a schematic diagram of another structure of an electronic device used in an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a fingerprint identification apparatus according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of another fingerprint identification apparatus according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of another fingerprint identification apparatus according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of another fingerprint identification apparatus according to an embodiment of the present application.
Fig. 7 is a schematic block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
With the development of the times and the progress of technology, the screen occupation ratio of the screen of the electronic product is higher and higher, and the comprehensive screen has become the development trend of a plurality of electronic products. To accommodate such a trend in full-screen, photosensitive devices in electronic products, such as fingerprint recognition, front cameras, etc., will also be placed under the screen. The most widely used under-screen fingerprint recognition technology is under-screen optical fingerprint recognition technology, and due to the specificity of an under-screen optical fingerprint device, light with fingerprint signals is required to be transmitted to a fingerprint sensor below through a screen, so that the fingerprint signals are obtained.
Taking the optical fingerprint recognition under the screen as an example, the fingerprint recognition process will be described in detail.
It should be understood that the embodiments of the present application may be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and medical diagnostic products based on optical fingerprint imaging, and the embodiments of the present application are only described by way of example in terms of optical fingerprint systems, but should not be construed as limiting the embodiments of the present application in any way, and the embodiments of the present application are equally applicable to other systems employing optical imaging techniques, etc.
As a common application scenario, the optical fingerprint system provided by the embodiment of the application can be applied to portable or mobile computing devices such as smart phones, tablet computers, game devices and other electronic devices such as electronic databases, automobiles and bank automatic teller machines (automated teller machine, ATM), but the embodiment of the application is not limited to the application, and the embodiment of the application can be applied to other mobile terminals or other electronic devices with display screens; more specifically, in the above electronic device, the fingerprint recognition device may be specifically an optical fingerprint device, which may be disposed in a partial area or an entire area Under the display screen, thereby forming an Under-screen (Under-display) optical fingerprint system. Alternatively, the fingerprint recognition device may be partially or fully integrated inside the display screen of the electronic apparatus, thereby forming an In-screen (In-display) optical fingerprint system.
Fig. 1 and fig. 2 are schematic structural views of two electronic devices to which the embodiment of the present application may be applied, where fig. 1 is a top view and fig. 2 is a schematic structural view of a portion of the electronic device shown in fig. 1 along A-A'. The electronic device 10 comprises a display screen 120 and an optical fingerprint means 130, wherein the optical fingerprint means 130 is arranged in a local area under the display screen 120. The optical fingerprint device 130 includes an optical fingerprint sensor, which includes a sensing array 133 having a plurality of optical sensing units 131, where a region of the sensing array or a sensing region thereof is the fingerprint detection region 103 corresponding to the optical fingerprint device 130. As shown in fig. 1, the fingerprint detection area 103 is located in the display area of the display 120. In an alternative embodiment, the optical fingerprint device 130 may also be disposed at other locations, such as the side of the display screen 120 or an edge non-transparent area of the electronic device 10, and the optical signals of at least a portion of the display area of the display screen 120 are directed to the optical fingerprint device 130 by an optical path design such that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
It should be appreciated that the area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, by a light path design such as lens imaging, a reflective folded light path design, or other light path designs such as light converging or reflecting, the area of the fingerprint detection area 103 corresponding to the optical fingerprint device 130 may be made larger than the area of the sensing array of the optical fingerprint device 130. In other alternative implementations, the fingerprint detection area 103 corresponding to the optical fingerprint device 130 may be designed to substantially coincide with the area of the sensing array of the optical fingerprint device 130 if the light path guiding is performed, for example, by light collimation.
Therefore, when the user needs to unlock the electronic device or perform other fingerprint verification, the user only needs to press the finger against the fingerprint detection area 103 located on the display screen 120, so as to implement fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 adopting the above structure does not need to have a special reserved space on the front surface to set fingerprint keys (such as Home keys), so that a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be basically expanded to the front surface of the whole electronic device 10.
As an alternative implementation manner, as shown in fig. 2, the optical fingerprint device 130 includes a light detecting portion 134 and an optical component 132, where the light detecting portion 134 includes an sensing array, and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which may be fabricated on a chip (Die) such as an optical imaging chip or an optical fingerprint sensor by a semiconductor process, and the sensing array is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors may be used as the optical sensing units as described above; the optical assembly 132 may be disposed over the sensing array of the light detecting portion 134, which may specifically include a Filter layer (Filter) that may be used to Filter out ambient light that penetrates the finger, a light guiding layer or light path guiding structure that is primarily used to guide light returning from the finger to the sensing array for optical detection, and other optical elements.
In particular implementations, the optical assembly 132 may be packaged in the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged on the same optical fingerprint chip as the optical detecting portion 134, or the optical component 132 may be disposed outside the chip on which the optical detecting portion 134 is disposed, for example, the optical component 132 is attached to the chip, or some of the components of the optical component 132 are integrated in the chip.
The light guiding layer or the light path guiding structure of the optical component 132 may have various implementations, for example, the light guiding layer of the optical component 132 may be a Collimator (Collimator) layer made of a semiconductor silicon wafer, which has a plurality of collimating units or a micropore array, the collimating units may be small holes, the light vertically incident to the collimating units from the reflected light reflected by the finger may pass through and be received by the optical sensing units below the collimating units, and the light with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, so each optical sensing unit basically only receives the reflected light reflected by the fingerprint lines right above the optical sensing units, and the sensing array can detect the fingerprint image of the finger.
In another embodiment, the light guiding layer or light path guiding structure may also be an optical Lens (Lens) layer having one or more Lens units, such as a Lens group of one or more aspheric lenses, and the optical assembly 132 may include a Lens for converging the reflected light reflected from the finger to a sensing array of the light detecting portion 134 thereunder so that the sensing array may image based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further form a pinhole in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint device to enhance the fingerprint imaging effect of the optical fingerprint device 130.
In other embodiments, the light guiding layer or light path guiding structure may also specifically employ a Micro-Lens layer having a Micro-Lens array formed of a plurality of Micro-lenses, which may be formed over the sensing array of the light sensing part 134 by a semiconductor growth process or other processes, and each Micro-Lens may correspond to one of sensing cells of the sensing array, respectively. And, other optical film layers, such as a dielectric layer or a passivation layer, may be further formed between the microlens layer and the sensing unit, and more particularly, a light blocking layer having micro holes may be further included between the microlens layer and the sensing unit, wherein the micro holes are formed between the corresponding microlenses and the sensing unit, the light blocking layer may block optical interference between adjacent microlenses and sensing units, and light corresponding to the sensing unit is converged into the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging. It should be appreciated that several implementations of the above-described light path guiding structure may be used alone or in combination, e.g. a micro-lens layer may be further provided below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific laminated structure or the optical path thereof may need to be adjusted as actually needed.
Alternatively, in some embodiments, the optical fingerprint device 130 may include only one optical fingerprint sensor, where the area of the fingerprint detection area 103 of the optical fingerprint device 130 is small and the position is fixed, so that the user needs to press the finger to a specific position of the fingerprint detection area 103 when inputting a fingerprint, otherwise, the optical fingerprint device 130 may not be able to acquire a fingerprint image, resulting in poor user experience.
In other alternative embodiments, the optical fingerprint device 130 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be disposed side by side below the display screen 120 in a spliced manner, and sensing areas of the plurality of optical fingerprint sensors together form a fingerprint detection area 103 corresponding to the optical fingerprint device 130. That is, the fingerprint detection area 103 corresponding to the optical fingerprint device 130 may include a plurality of sub-areas, each sub-area corresponds to a sensing area of one of the optical fingerprint sensors, so that the fingerprint acquisition area 103 of the optical fingerprint module 130 may be extended to a main area of the lower half of the display screen, that is, to a finger usual pressing area, so as to implement a blind press type fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 130 may also be extended to half or even the whole display area, thereby enabling half-screen or full-screen fingerprint detection.
It should be appreciated that in particular implementations, the electronic device 10 also includes a transparent cover plate 110, alternatively referred to as a transparent protective cover plate 110, the cover plate 110 may be a glass cover plate or a sapphire cover plate that is positioned over the display screen 120 and covers the front side of the electronic device 10. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually means pressing on the cover plate 110 above the display screen 120 or covering the protective layer surface of the cover plate 110.
It should be understood that the display 120 in the embodiment of the present application may be a display having a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display or a Micro-LED (Micro-LED) display. Taking an OLED display as an example, the optical fingerprint device 130 can utilize a display unit (i.e., an OLED light source) of the OLED display 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 103, the display 120 emits a beam of light 111 towards the target finger 140 above the fingerprint detection area 103, which light 111 is reflected at the surface of the finger 140 to form reflected light or scattered inside the finger 140 to form scattered light.
It should be understood that the above reflected light and scattered light are collectively referred to as reflected light for convenience of description. Since ridges (ribs) 141 and valleys (ribs) 142 of the fingerprint have different light reflection capacities, the reflected light 151 from the ridges 141 and the reflected light 152 from the valleys 142 of the fingerprint have different light intensities, and the reflected light is received by the sensing array 134 in the optical fingerprint device 130 and converted into corresponding electrical signals, i.e., fingerprint detection signals after passing through the optical component 132; fingerprint image data may be obtained based on the fingerprint detection signal and further fingerprint matching verification may be performed to implement an optical fingerprint identification function at the electronic device 10.
The optical fingerprint identification technology under the screen generally adopts light emitted by the screen as a light source, an optical signal emitted by the screen reaches a finger above the screen, the optical signal after reflection or scattering of the finger carries fingerprint information of the finger, and the optical signal carrying the fingerprint information can be received by a fingerprint sensor below the screen for fingerprint identification.
However, if a user performs fingerprint identification in outdoor sunlight, light in red light wave bands and infrared wave bands in the sunlight can directly penetrate through the finger to reach the fingerprint sensor, and as the light intensity of the red light and the infrared light in the sunlight is relatively large, the light signal with fingerprint information is annihilated in background noise of the red light and the infrared light, so that the fingerprint sensor is invalid. Therefore, how to filter out the optical signals of the red light band and the infrared light band in the fingerprint identification process is a problem to be solved.
Because the transmission capacity of the finger to red light and infrared light is strong, that is, the red light and infrared light signals in the light signals remained after sunlight passes through the finger are strongest, the influence on fingerprint identification is greatest, and therefore, the application mainly considers how to filter the light signals in the red light wave band and the infrared wave band.
The optical signal in the infrared band may be, for example, an optical signal having a wavelength of 770nm to 1mm, and the optical signal in the red band may be, for example, an optical signal having a wavelength of 622nm to 770 nm.
As shown in fig. 3, the method for filtering red light and infrared light in the embodiment of the present application may be shown in fig. 3, where the fingerprint recognition device shown in fig. 3 includes a filter 300, an optical path guiding structure 102, and a fingerprint sensor 100, and the fingerprint sensor may include a sensing array 101 having a plurality of optical sensing units, and the fingerprint sensor may be disposed on a substrate 200.
The light path guiding structure 102 may be any of the light path guiding structures described above.
The optical signal sent by the screen 400 reaches the finger 500, and after being reflected by the finger 500, the optical signal carrying the fingerprint information carries the fingerprint information, and after passing through the screen 400, the optical filter 300 and the optical path guiding structure 102, the optical signal is received by the sensing array 101 of the fingerprint sensor 100, and the fingerprint sensor 100 can perform fingerprint identification according to the received optical signal.
If the user performs fingerprint identification in the sun, the infrared light 501 and the red light 601 in the sun can pass through the finger 500 and the display screen 400 to reach the optical filter 300, and as the optical filter 300 can filter out the light signals of the red light wave band and the infrared wave band, the infrared light 501 and the red light 601 after reaching the optical filter 300 are reflected by the optical filter 300 to form reflected infrared light 502 and reflected red light 602, and as the reflected infrared light 502 and the reflected red light 602 cannot reach the fingerprint sensor 100, the influence of the red light and the infrared light on fingerprint identification is avoided.
However, since the red light is visible light, the infrared light 602 reflected by the filter 300 passes through the display screen and is easily observed by human eyes. The human eye can see the outline or shadow of the device under the screen when looking from above the screen, which can affect the aesthetics and consistency of the screen.
The embodiment of the application develops a method for solving the problem of the appearance of the under-screen fingerprint device on the basis of a large number of engineering practices, which not only can ensure that red light and infrared light do not enter the fingerprint sensor to influence fingerprint identification, but also can solve the problem of the appearance caused by reflection of the red light, and ensure the integrity and the attractive appearance of the electronic product.
As shown in fig. 4 and 5, the off-screen fingerprint recognition device may include a filter 301, an absorption layer 302, an optical path guiding structure 102, and a fingerprint sensor 100. The fingerprint recognition device may be disposed below the display screen 400 to implement off-screen fingerprint recognition.
The fingerprint sensor 100 may include a sensing array 101 having a plurality of optical sensing units, the sensing array 101 being configured to receive a return light signal returned from a finger 500 above the display screen 400 and passing through the optical filter 301, the absorption layer 302 and the light path guiding structure 102, and to generate a fingerprint image of the finger 500 based on the return light signal. The optical filter 301 may be used to filter out an optical signal in an infrared band of the return optical signal, the absorption layer 302 may be used to absorb an optical signal in a red band of the return optical signal, and the optical path guiding structure 102 may be used to guide the return optical signal to the fingerprint sensor 100.
By introducing the absorption layer 302, the absorption layer 302 can be arranged above the fingerprint sensor 100 to absorb the red light signal in the light signal returned by the finger, so that on one hand, the red light signal can be prevented from entering the fingerprint sensor 100 to affect fingerprint identification, and on the other hand, the red light signal can be prevented from entering human eyes after being reflected to affect the attractiveness of the mobile phone.
The location of the absorbent layer 302 is not particularly limited in the embodiment of the present application.
As an example, the absorption layer 302 may be coated on the upper surface of the optical filter 301, may be coated on the lower surface of the optical filter 301, or may be coated on both the upper and lower surfaces of the optical filter 301. In this case, the absorption layer 302 has the filter 301 as a substrate to realize a function of absorbing light.
As yet another example, the absorbing layer 302 may be coated on either surface of the light path guiding structure 102. Referring to the above description, the optical path guiding structure 102 may include a multi-layered structure in which the absorption layer 302 may be coated on the surface of any one or more layers. For example, the light path guiding structure 102 may include an optical collimator, and the absorption layer 302 may be coated on an upper surface and/or a lower surface of the optical collimator. For another example, the light path guiding structure 102 may include a microlens layer, and the absorption layer 302 may be coated on an upper surface and/or a lower surface of the microlens layer.
As yet another example, the absorbing layer 302 may be coated on the upper surface of the fingerprint sensor 100, and in particular, the absorbing layer 302 may be coated on the upper surface of the sensing array 101 of the fingerprint sensor 100.
In order to achieve better absorption effect, the embodiments of the present application may provide a plurality of absorption layers 302 to absorb more light signals in the red light band. For example, the absorption layer 302 may be coated on both the upper and lower surfaces of the filter 301. For another example, an absorption layer may be coated on both the surface of the optical filter 301 and the surface of the optical path guiding structure 102.
The material used for the absorbing layer 302 may be a polymer film material or a polymer film material, which is not particularly limited in the embodiment of the present application.
In addition, the coating method of the absorbing layer 302 in the embodiment of the present application is not particularly limited. For example, the absorption layer 302 may be coated on any one of the upper surfaces of the optical filter 301, the optical path guiding structure 102, and/or the fingerprint sensor 100 by means of dry film lamination. For another example, the absorption layer 302 may be coated on any one of the upper surfaces of the optical filter 301, the light path guiding structure 102, and/or the fingerprint sensor 100 by spin-coating baking.
The position of the optical filter 301 is not particularly limited in the embodiment of the present application, and the optical filter 301 may be disposed above the optical path guiding structure 102 or below the optical path guiding structure 102, as long as the optical filter 301 is disposed above the fingerprint sensor 100.
The arrangement of the optical filter 301 in the embodiment of the present application is not particularly limited. For example, the filter 301 may be attached to the screen 400, and attached to the lower surface of the screen 400. For another example, the filter 301 may be suspended in the fingerprint recognition device. For another example, the optical filter 301 may be bonded to the optical path guiding layer 102.
When the absorption layer 302 is provided above the optical filter 301, the optical filter 301 may reflect an optical signal in the infrared band. Since the absorption layer 302 has absorbed the red light in the return light signal, the detection performance of the fingerprint sensor is not affected as long as the optical filter can filter out the light signal in the infrared band in the return light signal.
In this case, the optical filter 301 may reflect the optical signal of the red light band, so that no special design for receiving and/or materials of the optical filter may be required, and a conventional optical filter capable of reflecting the red light and the infrared light signal may be used, thereby saving manufacturing costs.
In the case where the absorption layer 302 is disposed below the filter 301, the filter 301 functions to reflect an optical signal of an infrared band and transmit an optical signal of a red band. Since the absorption layer 302 is located below the optical filter 301, the optical filter 301 needs to transmit the light signal of the red light band, the return light signal filtered by the optical filter 301 reaches the absorption layer 302, and the absorption layer 302 can absorb the light signal of the red light band in the return light signal, so as to prevent the light signal of the red light band from entering the human eye after being reflected by the optical filter 301, and affecting the aesthetic appearance of the screen.
In an embodiment of the present application, the absorption rate of the absorption layer 302 for the optical signal in the red light band is greater than 85% so as to be able to absorb most of the optical signal in the red light band of the return optical signal.
In addition, the absorption layer 302 and the filter 301 need to be capable of transmitting both blue and green light bands, for example, the transmittance of the material used for the absorption layer 302 and the filter 301 to light signals in both the blue and green light bands is greater than 80%.
In the fingerprint identification of the embodiment of the present application, the light emitted by the display screen 400 is used as the light source, the light signals emitted by the display screen 400 are mainly red light, blue light and green light, in order to reduce the interference of the red light in the sunlight on fingerprint identification, the absorption layer 302 filters the red light, so that the rest light signals capable of being used for fingerprint identification are mainly blue light and green light, and therefore, the absorption layer 302 and the optical filter 301 need to be capable of transmitting the blue light and the green light, so as to ensure the reliability of fingerprint identification.
In order not to affect the thickness of the fingerprint recognition device, the thickness of the absorption layer may be controlled to be within 2 μm.
The filter 301 in the embodiment of the present application may include a single layer film or a multilayer film.
For example, the filter 301 may include a single-layer film or a multi-layer film coated on a substrate. The substrate may be a substrate dedicated to the filter. The substrate may be made of white glass, blue glass or blue crystal, and the embodiment of the present application is not particularly limited.
As another example, similar to the absorbing layer 302, the optical filter 301 may use the light guiding structure 102 and/or the fingerprint sensor 100 as a substrate to achieve a filtering function. The optical filter 301 may include a single-layer film or a multi-layer film coated on either surface of the optical path guiding structure 102 and/or the fingerprint sensor 100.
The filter in the embodiment of the application filters infrared light mainly by reflecting infrared light, and of course, the filter can also filter infrared light by absorbing infrared light.
The fingerprint recognition device according to the embodiment of the present application will be described in detail with reference to fig. 6.
The fingerprint recognition device shown in fig. 6 may include a microlens array 210, light blocking layers 310, 320, and a fingerprint sensor 100.
The fingerprint sensor 100 may include a plurality of sensing arrays 101, which may include a plurality of pixel units 1011. The light blocking layers 310 and 320 may be formed above the sensor array 101, wherein the light blocking layers 310 and 320 may have a plurality of light passing holes 311 and 321. The microlens array 210 may be disposed over the light blocking layer 310, and the microlens array 210 may include a plurality of microlenses 211.
The micro lens array 210 may be used to collect the optical signals returned by the finger into the plurality of light-passing holes 311 on the light-blocking layer 310, then the plurality of light-passing holes 311 may guide the optical signals into the plurality of light-passing holes 321 on the light-blocking layer 320, the optical signals passing through the light-passing holes 321 may be received by the pixel unit 1011 under the light-blocking layer 320, and the pixel unit 1011 may perform fingerprint identification according to the received optical signals.
The aperture of the light passing aperture 311 on the light blocking layer 310 may be larger than the aperture of the light passing aperture 321 on the light blocking layer 320.
In the embodiment of the present application, each microlens in the microlens array 210 may include a corresponding light-passing aperture and a pixel unit, and the center of each microlens, the center of the corresponding light-passing aperture, and the center of the pixel unit may be located on a straight line, so that it is ensured that an optical signal focused by the microlens can be received by the pixel unit. Alternatively, the straight line may be perpendicular to the plane in which the fingerprint sensor 100 is located, and may also have an included angle with the plane in which the fingerprint sensor 100 is located of less than 90 degrees. It will be appreciated that, when the included angle between the straight line and the plane where the fingerprint sensor 100 is located is smaller than 90 degrees, the centers of each microlens, the corresponding light-passing aperture and the pixel unit are all spaced apart from each other in the horizontal direction, and the spacing distance is determined according to the actual situation, so long as it is ensured that the optical signal focused by the microlens can be received by the corresponding pixel unit.
A dielectric layer 621 may be disposed between the light blocking layer 310 and the light blocking layer 320, a dielectric layer 622 may be disposed between the light blocking layer 310 and the microlens layer 210, and a dielectric layer 620 may be disposed between the light blocking layer 320 and the sensor array 101. Dielectric layer 620, dielectric layer 621, and dielectric layer 622 may be grown sequentially by a growth process.
A buffer layer 510 may be disposed above the microlens array 210, where the buffer layer 510 is a transparent dielectric buffer layer having an optical refractive index lower than that of the lens array 210.
The absorber layer in the per se embodiments may be disposed on the surface of any structural layer above the inductive array 101.
As an example, the absorbing layer may be disposed on the upper surface of the microlens array 210 or may be disposed on the lower surface of the microlens array 210. Specifically, the absorbing layer may be disposed on the upper surface of the buffer layer 510, or the absorbing layer may be disposed on the lens surface in the microlens array.
As yet another example, the absorber layer may be disposed on any surface of the light blocking layers 310, 320. For example, the absorption layer may be disposed on the upper surface of the light blocking layer 310, or may be disposed on the lower surface of the light blocking layer 310.
As yet another example, the absorber layer may be disposed on any surface of the dielectric layers 622, 621, 620. For example, the absorber layer may be disposed on the upper surface of the dielectric layer 622 or may be disposed on the lower surface of the dielectric layer 622.
As yet another example, an absorber layer may also be provided on the upper surface of the sensor array 101.
The optical filter may also be disposed on the surface of any structural layer above the sensor array 101, where the optical filter is disposed similar to the absorption layer, and specific positions may be referred to above, which is not described herein.
The fingerprint recognition device shown in fig. 6 includes two light blocking layers, which is only an example, and the fingerprint recognition device may include only one light blocking layer or may include more than two light blocking layers.
The micro lenses 211 shown in fig. 6 may be circular lenses, or the micro lenses 211 may be polygonal lenses, such as square lenses or hexagonal lenses.
The microlens array 210 may be used to direct vertical light as well as oblique light, and embodiments of the present application are not particularly limited.
The light path guiding structure of the embodiment of the present application may include a microlens array, a dielectric layer, a light blocking layer, a light passing aperture, and the like as shown in fig. 6, and of course, the light path guiding structure may also include other structures, for example, the light path guiding structure may also include a collimation hole array.
Fig. 7 is a schematic block diagram of an electronic device according to an embodiment of the present application. The electronic device 700 comprises a display screen 710 and fingerprint recognition means 720. The fingerprint recognition device 720 may be disposed below the display screen 710 to fingerprint a finger above the display screen 710.
The display screen 710 may be any of the display screens described above, and the display screen 710 may be, for example, a self-emissive display screen, such as an OLED screen.
The fingerprint recognition device 720 may be any of the fingerprint recognition devices described above, and is not described herein for simplicity.
It should be noted that, the optical fingerprint sensor in the embodiment of the present application may represent an optical fingerprint sensor chip.
It is noted that the terminology used in the embodiments of the application and in the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the application.
For example, as used in the embodiments of the application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Those of skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.
If implemented as a software functional unit and sold or used as a stand-alone product, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present application may be embodied in essence or a part contributing to the prior art or a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus, device and unit described above may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed electronic device, apparatus, and method may be implemented in other manners.
For example, the division of units or modules or components in the above-described apparatus embodiments is merely a logic function division, and there may be another division manner in actual implementation, for example, multiple units or modules or components may be combined or may be integrated into another system, or some units or modules or components may be omitted or not performed.
As another example, the units/modules/components described above as separate/display components may or may not be physically separate, i.e., may be located in one place, or may be distributed over multiple network elements. Some or all of the units/modules/components may be selected according to actual needs to achieve the objectives of the embodiments of the present application.
Finally, it is pointed out that the coupling or direct coupling or communication connection between the various elements shown or discussed above can be an indirect coupling or communication connection via interfaces, devices or elements, which can be in electrical, mechanical or other forms.
The foregoing is merely a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the embodiment of the present application, and the changes or substitutions are covered by the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.
Claims (15)
1. A fingerprint identification device which is suitable for electronic equipment with a display screen, and is characterized in that the fingerprint identification device is arranged below the display screen and comprises an optical filter, an absorption layer, an optical path guiding structure and a fingerprint sensor;
the fingerprint sensor comprises an induction array with a plurality of optical induction units, wherein the induction array is used for receiving a return light signal returned by a finger above the display screen and passing through the optical filter, the absorption layer and the light path guiding structure, and generating a fingerprint image of the finger according to the return light signal;
the optical filter is used for filtering optical signals of infrared wave bands in the return optical signals;
the absorption layer is used for absorbing the optical signals of the red light wave band in the return optical signals;
the optical path guiding structure is used for guiding the return optical signal to the fingerprint sensor, and comprises at least one of a collimator layer, an optical lens layer and a micro lens layer.
2. The fingerprint recognition device according to claim 1, wherein the absorption layer is coated on an upper surface and/or a lower surface of the optical filter.
3. The fingerprint recognition device according to claim 1 or 2, wherein the absorption layer is coated on any one surface of the optical path guiding structure.
4. The fingerprint recognition device according to claim 1 or 2, wherein the absorbing layer is coated on an upper surface of the sensing array of the fingerprint sensor.
5. The fingerprint recognition device according to claim 1 or 2, wherein the optical filter is configured to reflect the optical signal of the infrared band in a case where the absorption layer is disposed above the optical filter.
6. The fingerprint recognition device according to claim 1 or 2, wherein the optical filter is configured to reflect the optical signal of the infrared band and transmit the optical signal of the red band in a case where the absorption layer is disposed below the optical filter.
7. A fingerprint recognition device according to claim 1 or 2, wherein the return light signal comprises a light signal emitted by the display screen that is reflected or scattered by the finger.
8. The fingerprint recognition device according to claim 1 or 2, wherein the absorption rate of the absorption layer for the light signal in the red light band is more than 85%.
9. The fingerprint recognition device according to claim 1 or 2, wherein the transmittance of the absorption layer and the optical filter to light signals in both blue and green light bands is greater than 80%.
10. Fingerprint recognition device according to claim 1 or 2, characterized in that the thickness of the absorbing layer is less than 2 μm.
11. The fingerprint recognition device according to claim 1 or 2, wherein the optical filter comprises a single-layer film or a multi-layer film coated on a substrate.
12. The fingerprint recognition device according to claim 1 or 2, wherein the optical filter comprises a single-layer film or a multi-layer film coated on either one of the upper surfaces of the optical path guiding structure and/or the fingerprint sensor.
13. The fingerprint recognition device according to claim 1 or 2, wherein the material used for the absorbing layer is a polymer film material or a polymer film material.
14. The fingerprint recognition device according to claim 1 or 2, wherein the absorption layer is coated on any one of the upper surfaces of the optical filter, the optical path guiding structure and/or the fingerprint sensor by dry film lamination or spin-coating baking.
15. An electronic device, comprising:
a display screen;
and a fingerprint recognition device according to any one of claims 1-14, said fingerprint recognition device being arranged below said display screen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2019/103321 WO2021035622A1 (en) | 2019-08-29 | 2019-08-29 | Fingerprint recognition apparatus and electronic device |
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| CN111164608A CN111164608A (en) | 2020-05-15 |
| CN111164608B true CN111164608B (en) | 2023-09-01 |
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| CN201980004113.XA Active CN111164608B (en) | 2019-08-29 | 2019-08-29 | Fingerprint identification device and electronic equipment |
| CN201921806158.2U Active CN210605743U (en) | 2019-08-29 | 2019-10-24 | Optical fingerprint device and electronic equipment |
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| CN201921806158.2U Active CN210605743U (en) | 2019-08-29 | 2019-10-24 | Optical fingerprint device and electronic equipment |
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| WO (1) | WO2021035622A1 (en) |
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| CN111052143B (en) * | 2019-04-10 | 2023-09-08 | 深圳市汇顶科技股份有限公司 | Optical fingerprint device and electronic equipment |
| CN111708202B (en) * | 2020-07-17 | 2023-12-01 | 京东方科技集团股份有限公司 | Display panel and display device |
| KR20220021046A (en) * | 2020-08-12 | 2022-02-22 | 삼성디스플레이 주식회사 | Display device and method for driving the same |
| CN112232306A (en) * | 2020-11-20 | 2021-01-15 | 厦门天马微电子有限公司 | Display panel and display device |
| CN113253374B (en) * | 2021-05-27 | 2023-06-02 | 武汉华星光电技术有限公司 | Fingerprint identification display device |
| CN113504666A (en) * | 2021-07-20 | 2021-10-15 | 武汉华星光电技术有限公司 | Display device |
| TWI811854B (en) * | 2021-07-23 | 2023-08-11 | 友達光電股份有限公司 | Optical sensing device |
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| CN210605743U (en) | 2020-05-22 |
| WO2021035622A1 (en) | 2021-03-04 |
| CN111164608A (en) | 2020-05-15 |
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