CN111164608A - Fingerprint identification device and electronic equipment - Google Patents
Fingerprint identification device and electronic equipment Download PDFInfo
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- CN111164608A CN111164608A CN201980004113.XA CN201980004113A CN111164608A CN 111164608 A CN111164608 A CN 111164608A CN 201980004113 A CN201980004113 A CN 201980004113A CN 111164608 A CN111164608 A CN 111164608A
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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 fingerprint identification device and electronic equipment can filter the light signal of ruddiness wave band and infrared wave band in the finger return light signal to avoid causing the influence to fingerprint sensor's fingerprint identification. The fingerprint identification device is suitable for electronic equipment with a display screen, is arranged below the display screen and comprises an optical filter, an absorption layer, a light path guide 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 return light signals which return from a finger above the display screen and pass through the optical filter, the absorption layer and the light path guide structure, and generating a fingerprint image of the finger according to the return light signals; the optical filter is used for filtering optical signals of an infrared band in the return optical signals; the absorption layer is used for absorbing the optical signal in the red light wave band in the return optical signal; the optical path directing structure is for directing 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 an electronic device.
Background
With the rapid development of the mobile phone industry, the fingerprint identification technology is more and more emphasized by people, and the practicability of the under-screen fingerprint identification technology becomes a requirement of 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 can adopt the light that the screen sent as the light source under the screen, can carry the fingerprint information of finger behind the light irradiation that the screen sent to the finger of screen top, and the light signal who carries fingerprint information can be received by fingerprint sensor to carry out fingerprint identification.
However, if fingerprint recognition is performed in outdoor sunlight, the red light and the infrared band light in the sunlight can directly penetrate through the finger to reach the fingerprint sensor, so that the light signal with the fingerprint information is annihilated in the background noise of the red light and the infrared light, and the fingerprint sensor fails. Therefore, how to filter out the optical signals of red light and infrared light bands in the fingerprint identification process becomes a problem which needs to be solved urgently.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification device and electronic equipment, can filter the ruddiness in the sunlight and the optical signal of infrared band to avoid the sunlight to cause the influence to fingerprint identification.
In a first aspect, a fingerprint identification device is provided, which is suitable for an electronic device having a display screen, and is configured to be disposed below the display screen, where the fingerprint identification device includes an optical filter, an absorption layer, a light path guiding structure, and a fingerprint sensor; the fingerprint sensor comprises an induction array with a plurality of optical induction units, the induction array is used for receiving return light signals which return from a finger above the display screen and pass through the optical filter, the absorption layer and the light path guide structure, and generating a fingerprint image of the finger according to the return light signals; the optical filter is used for filtering an optical signal of an infrared band in the return optical signal; the absorption layer is used for absorbing the optical signal in the red waveband in the return optical signal; the optical path directing structure is to direct 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 optical signal of the infrared waveband in the optical signal returned by the finger, and the absorption layer can be used for absorbing the optical signal of the red light waveband in the optical signal returned by the finger, so that the red light signal and the infrared signal reach the fingerprint sensor, and the fingerprint identification performance of the fingerprint sensor cannot be influenced. In addition, the red light signal is absorbed by the absorption layer, so the red light signal can not enter human eyes, and the beauty of the display screen can be displayed.
In some possible implementations, the absorption layer is coated on the upper surface and/or the lower surface of the optical filter.
In some possible implementations, the absorption layer is coated on any one surface of the optical 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 absorption layer disposed above the optical filter.
In some possible implementations, in a case where the absorption layer is disposed below the optical filter, the optical filter is configured to reflect the optical signal in the infrared band and transmit the optical signal in the red band.
When the absorbing layer is disposed below the optical filter, the optical filter is required to be able to reflect infrared light and transmit red light, so as to prevent the red light from entering human eyes to affect the beauty of the display screen.
In some possible implementations, the return optical signal includes an optical signal emitted by the display screen that is reflected or scattered by the finger.
In some possible implementations, the absorption rate of the absorption layer for the optical signal in the red wavelength band is greater than 85%.
In some possible implementations, the absorption layer and the optical filter have a transmittance of greater than 80% for both the blue and green bands of optical signals.
Both the absorption layer and the optical filter can transmit blue light and green light to ensure the intensity of an optical signal for fingerprint identification.
In some possible implementations, the thickness of the absorption layer is less than 2 μm.
In some possible implementations, the optical 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 upper surfaces of the light path guide structure and/or the fingerprint sensor.
In some possible implementations, the material used for the absorption layer is a polymer film material or a polymer adhesive film material.
In some possible implementations, 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 bonding or spin-coating baking.
In a second aspect, an electronic device is provided, comprising: a display screen, and the fingerprint identification device of the first aspect and any possible implementation thereof.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device used in an embodiment of the present application.
Fig. 2 is another schematic structural diagram of an electronic device used in an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a fingerprint identification device according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of another fingerprint identification device according to an embodiment of the present application.
Fig. 7 is a schematic block diagram of an electronic device provided in 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 science and technology, the screen occupation ratio of the screens of electronic products is higher and higher, and the full screen becomes the development trend of a plurality of electronic products. To accommodate the trend of such full-screen displays, light sensing devices such as fingerprint recognition, front cameras, etc. in electronic products are also placed under the screen. The most applied technology is the optical fingerprint identification technology under the screen, and because of the particularity of the optical fingerprint device under the screen, the light with the fingerprint signal is required to be capable of transmitting the fingerprint sensor under the screen, so that the fingerprint signal is obtained.
Taking optical fingerprint identification under a screen as an example, the fingerprint identification process is described in detail.
It should be understood that the embodiments of the present application can 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, but should not be construed as limiting the embodiments of the present application, and the embodiments of the present application are also applicable to other systems using optical imaging technology, etc.
As a common application scenario, the optical fingerprint system provided in the embodiment of the present application may be applied to portable or mobile computing devices such as smart phones, tablet computers, and game devices, and other electronic devices such as electronic databases, automobiles, and Automated Teller Machines (ATMs), but the embodiment of the present application is not limited thereto, and the embodiment of the present application may be applied to other mobile terminals or other electronic devices having display screens; more specifically, in the above electronic device, the fingerprint recognition device may be embodied as an optical fingerprint device, which may be disposed in a partial area or an entire area below the display screen, thereby forming an Under-screen (Under-display) optical fingerprint system. Alternatively, the fingerprint identification device may be partially or completely integrated into a display screen of the electronic device, so as to form an In-display (In-display) optical fingerprint system.
Fig. 1 and fig. 2 are two schematic structural diagrams of an electronic device to which the embodiment of the present disclosure is applicable, where fig. 1 is a top view, and fig. 2 is a schematic structural diagram of a partial cross section of the electronic device shown in fig. 1 along a-a'. The electronic device 10 includes a display screen 120 and an optical fingerprinting device 130, wherein the optical fingerprinting device 130 is arranged in a local area below the display screen 120. The optical fingerprint device 130 comprises an optical fingerprint sensor, which comprises a sensing array 133 having a plurality of optical sensing units 131, and the area where the sensing array is located or the sensing area thereof is the fingerprint detection area 103 corresponding to the optical fingerprint device 130. As shown in fig. 1, the fingerprint detection area 103 is located in a display area of the display screen 120. In an alternative embodiment, the optical fingerprint device 130 may be disposed at other positions, such as the side of the display screen 120 or the edge opaque region of the electronic device 10, and the optical path is designed to guide the optical signal of at least a part of the display area of the display screen 120 to the optical fingerprint device 130, so 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 sensing area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, by the design of optical path such as lens imaging, reflective folded optical path design or other optical path design such as light converging or reflecting, the area of the fingerprint sensing area 103 corresponding to the optical fingerprint device 130 may be larger than the area of the sensing array of the optical fingerprint device 130. In other alternative implementations, if light path guidance is performed by, for example, light collimation, the fingerprint sensing area 103 corresponding to the optical fingerprint device 130 may also be designed to substantially correspond to the area of the sensing array of the optical fingerprint device 130.
Therefore, when the user needs to unlock or otherwise verify the fingerprint of the electronic device, the user only needs to press the finger on the fingerprint detection area 103 of the display screen 120, so as to input the fingerprint. Since fingerprint detection can be implemented in the screen, the electronic device 10 with the above structure does not need to reserve a space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be substantially extended to the front surface of the whole electronic device 10.
As an alternative implementation, as shown in fig. 2, the optical fingerprint device 130 includes a light detection portion 134 and an optical assembly 132, where the light detection portion 134 includes a sensing array, a reading circuit electrically connected to the sensing array, and other auxiliary circuits, which can be fabricated on a chip (Die) through a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor, where 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 can be used as the optical sensing units; the optical assembly 132 may be disposed above the sensing array of the light detecting portion 134, and may specifically include a Filter layer (Filter) for filtering ambient light penetrating through the finger, a light guiding layer or a light path guiding structure for guiding 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 with the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged in the same optical fingerprint chip as the optical detection portion 134, or the optical component 132 may be disposed outside the chip where the optical detection portion 134 is located, such as attaching the optical component 132 on the chip, or integrating some components of the optical component 132 into the chip.
For example, the light guide layer of the optical component 132 may be specifically a Collimator (collimater) layer fabricated on a semiconductor silicon wafer, and the light guide layer has a plurality of collimating units or a micro-hole array, where the collimating units may be specifically small holes, and in reflected light reflected from a finger, light perpendicularly incident to the collimating units may pass through and be received by optical sensing units below the collimating units, and light with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, so that each optical sensing unit can basically only receive reflected light reflected from fingerprint lines directly above the optical sensing unit, and the sensing array can detect a fingerprint image of the finger.
In another embodiment, the light guiding layer or the light path guiding structure may also be an optical Lens (Lens) layer having one or more Lens units, such as a Lens group consisting of one or more aspheric lenses, and the optical component 132 may include a Lens for converging the reflected light reflected from the finger to the sensing array of the light detecting portion 134 therebelow, so that the sensing array may be imaged based on the reflected light to obtain the 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 enlarge the field of view of the optical fingerprint device, so as to improve the fingerprint imaging effect of the optical fingerprint device 130.
In other embodiments, the light guide layer or the light path guiding structure may also specifically adopt a Micro-Lens (Micro-Lens) layer, the Micro-Lens layer has a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the sensing array of the light detecting portion 134 through a semiconductor growth process or other processes, and each Micro-Lens may respectively correspond to one of the sensing units of the sensing array. And another optical film layer, such as a dielectric layer or a passivation layer, may be further formed between the microlens layer and the sensing unit, and more specifically, a light blocking layer having micro holes may be further included between the microlens layer and the sensing unit, where the micro holes are formed between the corresponding microlenses and the sensing unit, and the light blocking layer may block optical interference between the adjacent microlenses and the sensing unit, and enable light corresponding to the sensing unit to be converged inside the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging. It should be understood that several implementations of the above-described optical path directing structure may be used alone or in combination, for example, a microlens layer may be further disposed 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 stack structure or optical path thereof may need to be adjusted according to actual needs.
Optionally, 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 location is fixed, so that a user needs to press a finger to a specific location of the fingerprint detection area 103 when performing a fingerprint input, otherwise the optical fingerprint device 130 may not acquire a fingerprint image and the user experience is poor.
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 splicing manner, and sensing areas of the plurality of optical fingerprint sensors jointly form the fingerprint detection area 103 corresponding to the optical fingerprint device 130. That is to say, the fingerprint detection area 103 corresponding to the optical fingerprint device 130 may include a plurality of sub-areas, each sub-area corresponding to the sensing area of one of the optical fingerprint sensors, respectively, so as to extend the fingerprint collection area 103 of the optical fingerprint module 130 to the main area of the lower half portion of the display screen, that is, to the area that the finger presses conventionally, thereby realizing the blind-touch 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 entire 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, and 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 face of the electronic device 10. Because, in the embodiment of the present application, the pressing of the finger on the display screen 120 actually means pressing the cover plate 110 above the display screen 120 or covering the surface of the protective layer covering the cover plate 110.
It should be understood that the display screen 120 in the embodiment of the present application may be a display screen having a self-Light Emitting display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking an OLED display screen as an example, the optical fingerprint device 130 may use the display unit (i.e., OLED light source) of the OLED display screen 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 toward the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected at the surface of the finger 140 to form reflected light or scattered light by scattering inside the finger 140.
It should be understood that the above-described reflected light and scattered light are collectively referred to as reflected light for convenience of description. Because ridges 141 and valleys 142 of the fingerprint have different light reflection capabilities, reflected light 151 from ridges 141 and reflected light 152 from valleys 142 of the fingerprint have different light intensities, and after passing through the optical assembly 132, 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; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the electronic device 10.
The optical fingerprint identification technology under the screen generally adopts light emitted by the screen as a light source, light signals emitted by the screen reach a finger above the screen, the light signals reflected or scattered by the finger carry fingerprint information of the finger, and the light signals carrying the fingerprint information can be received by a fingerprint sensor below the screen so as to carry out fingerprint identification.
However, if a user performs fingerprint recognition in outdoor sunlight, light in the red light band and the infrared band in sunlight can directly penetrate through a finger to reach the fingerprint sensor, and because the light intensity of the red light and the infrared light in sunlight is relatively high, light signals with fingerprint information are annihilated in background noise of the red light and the infrared light, so that the fingerprint sensor fails. Therefore, how to filter the optical signals in the red light band and the infrared light band in the fingerprint identification process becomes a problem to be solved urgently.
Because the finger has stronger transmission capability to red light and infrared light, that is, the signals of red light and infrared light in the residual light signals after the sunlight passes through the finger are strongest, and the influence on fingerprint identification is the greatest, the method mainly considers how to filter the light signals of red light wave band and infrared wave band.
The optical signal in the infrared band may refer to an optical signal having a wavelength of 770nm to 1mm, and the optical signal in the red band may refer to an optical signal having a wavelength of 622nm to 770nm, for example.
The method for filtering out red light and infrared light in the embodiment of the present application may be as shown in fig. 3, where the fingerprint identification device shown in fig. 3 includes an optical filter 300, an optical path guiding structure 102, and a fingerprint sensor 100, 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 optical path directing structure 102 may be any of the optical path directing structures described above.
The optical signal sent by the screen 400 reaches the finger 500, and carries the fingerprint information of the finger 500 after being reflected by the finger 500, the optical signal carrying the fingerprint information is received by the sensing array 101 of the fingerprint sensor 100 after passing through the screen 400, the optical filter 300 and the optical path guiding structure 102, and the fingerprint sensor 100 can perform fingerprint identification according to the received optical signal.
If a user performs fingerprint identification in the sun, infrared light 501 and red light 601 in the sun can pass through the finger 500 and the display screen 400 to reach the optical filter 300, and the optical filter 300 can filter light signals in red light wave bands and infrared wave bands, so that after the infrared light 501 and the red light 601 reach the optical filter 300, reflected infrared light 502 and reflected red light 602 are formed after being reflected by the optical filter 300, and because 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 the 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 outline or shadow of the device under the screen is visible to the human eye from above the screen, which can affect the aesthetics and uniformity of the screen.
The problem of fingerprint device outward appearance under the solution screen is developed on the basis of a large amount of engineering practices to this application embodiment, both can guarantee that ruddiness and infrared light do not get into fingerprint sensor and influence fingerprint identification, can solve the outward appearance problem that leads to because the reflection of ruddiness again, guarantee the wholeness and the pleasing to the eye of electronic product outward appearance.
As shown in fig. 4 and 5, the underscreen fingerprint identification apparatus may include an optical filter 301, an absorption layer 302, a light path guiding structure 102, and a fingerprint sensor 100. The fingerprint recognition device may be disposed below the display screen 400 to realize the underscreen fingerprint recognition.
The fingerprint sensor 100 may comprise a sensing array 101 having a plurality of optical sensing units, the sensing array 101 being configured to receive a return optical signal from the finger 500 over the display screen 400 and passing through the filter 301, the absorbing layer 302 and the optical path guiding structure 102, and generate a fingerprint image of the finger 500 according to the return optical signal. The optical filter 301 may be configured to filter out an infrared band of light signals from the return light signals, the absorbing layer 302 may be configured to absorb a red band of light signals from the return light signals, and the optical path directing structure 102 may be configured to direct the return light signals 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 red light signals in light signals returned by the finger, so that on one hand, the light signals of red light can be prevented from entering the fingerprint sensor 100 to influence fingerprint identification, and on the other hand, the light signals of red light can be prevented from entering human eyes after being reflected to influence the attractiveness of the mobile phone.
The arrangement position 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 surface and the lower surface of the optical filter 301. In this case, the absorption layer 302 functions to absorb light by using the optical filter 301 as a substrate.
As yet another example, the absorbing layer 302 may be coated on either surface of the optical path directing structure 102. With reference to the description above, the optical path directing structure 102 may include a multilayer structure, and the absorbing layer 302 may be coated on the surface of any one or more of the multilayer structure. For example, the optical path directing structure 102 may include an optical collimator, and the absorbing layer 302 may be coated on an upper surface and/or a lower surface of the optical collimator. For another example, the optical path directing structure 102 may include a microlens layer, and the absorption layer 302 may be coated on the upper surface and/or the 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, 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 embodiment of the present application may arrange a plurality of absorption layers 302 to absorb more optical signals in the red wavelength band. For example, the absorption layer 302 may be coated on both the upper and lower surfaces of the optical filter 301. For another example, the surface of the optical filter 301 and the surface of the optical path guiding structure 102 may be coated with an absorbing layer.
The material used for the absorption layer 302 may be a polymer film material, and may also be a polymer film material, which is not specifically limited in this application embodiment.
In addition, the coating method of the absorbing layer 302 is not particularly limited in the examples of the present application. For 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 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 optical path directing structure 102 and/or the fingerprint sensor 100 by means of spin-on baking.
The position of the filter 301 is not particularly limited in the embodiments of the present application, and the filter 301 may be disposed above the light path guiding structure 102 or below the light path guiding structure 102, as long as the filter 301 is disposed above the fingerprint sensor 100.
The embodiment of the present application does not specifically limit the arrangement manner of the optical filter 301. 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 already absorbs the red light in the return light signal, the detection performance of the fingerprint sensor is not affected as long as the 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 in the red wavelength band, so that the conventional optical filter capable of reflecting the red and infrared optical signals may be used without specially designing the receiving and/or material of the optical filter, and the manufacturing cost may be saved.
In the case where the absorption layer 302 is disposed under the optical filter 301, the optical filter 301 serves 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 optical signal in the red wavelength band, the return optical signal filtered by the optical filter 301 reaches the absorption layer 302, and the absorption layer 302 can absorb the optical signal in the red wavelength band in the return optical signal, so as to prevent the optical signal in the red wavelength band from entering human eyes after being reflected by the optical filter 301, which affects the aesthetic appearance of the screen.
In the embodiment of the present application, the absorption rate of the absorption layer 302 for the optical signal in the red wavelength band is greater than 85% to absorb most of the optical signal in the red wavelength band of the return optical signal.
In addition, the absorption layer 302 and the optical filter 301 need to be capable of transmitting light in the blue wavelength band and the green wavelength band, for example, the absorption layer 302 and the optical filter 301 use materials with transmittance of more than 80% for light signals in the blue wavelength band and the green wavelength band.
The fingerprint identification of this application embodiment is with the light that display screen 400 sent as the light source, and the light signal that display screen 400 sent uses ruddiness, blue light and green glow as leading, and in order to reduce the interference of the ruddiness in the sunlight to fingerprint identification, absorbing layer 302 has filtered ruddiness to remaining light signal that can be used for fingerprint identification is mainly blue light and green light, therefore absorbing layer 302 and light filter 301 need can transmit blue light and green light, just can guarantee fingerprint identification's reliability.
The thickness of the absorbing layer may be controlled to be within 2 μm so as not to affect the thickness of the fingerprint recognition device.
The filter film included in the optical filter 301 in the embodiment of the present application may be a single-layer film or a multi-layer film.
For example, the optical 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 optical filter. The substrate may be made of white glass, blue crystal, or the like, which is not particularly limited in the embodiments of the present application.
For another example, the filter 301 may use the optical path guiding structure 102 and/or the fingerprint sensor 100 as a substrate, similar to the absorption layer 302, to perform a filtering function. The filter 301 may include a single layer film or a multi-layer film coated on either surface of the light path guide structure 102 and/or the fingerprint sensor 100.
The optical filter in the embodiment of the application mainly filters infrared light in a way of reflecting the infrared light, and certainly, the optical filter can also filter the infrared light in a way of absorbing the infrared light.
The fingerprint identification 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 and 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 elements 1011. The light blocking layers 310 and 320 may be formed above the sensing array 101, wherein the light blocking layers 310 and 320 may be provided with 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 microlens array 210 may be configured to converge an optical signal returned by a finger to 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 signal to the plurality of light-passing holes 321 on the light-blocking layer 320, the optical signal passing through the light-passing holes 321 may be received by a pixel unit 1011 below the light-blocking layer 320, and the pixel unit 1011 may perform fingerprint identification according to the received optical signal.
The aperture of the light passing hole 311 of the light blocking layer 310 may be larger than the aperture of the light passing hole 321 of the light blocking layer 320.
In this embodiment, each microlens in the microlens array 210 may include a corresponding light-passing aperture and a pixel unit, and a center of each microlens, a center of the light-passing aperture corresponding to the center of the microlens, and a 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 of the fingerprint sensor 100, and may also form an angle smaller than 90 degrees with the plane of the fingerprint sensor 100. It is understood that when the included angle between the straight line and the plane where the fingerprint sensor 100 is located is smaller than 90 degrees, a certain distance is left between each microlens and the center of the corresponding light-passing aperture and the center of the pixel unit in the horizontal direction, and the distance is determined according to actual conditions as long as the light 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 in sequence by a growth process.
A buffer layer 510 may be disposed above the microlens array 210, and the buffer layer 510 is a transparent dielectric buffer layer having a lower optical refractive index than the lens array 210.
The absorbing layer in the embodiments of the present application may be disposed on the surface of any structural layer above the sensing array 101.
As an example, the absorption 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 absorption layer may be disposed on the upper surface of the buffer layer 510, or the absorption layer may be disposed on the lens surface in the microlens array.
As yet another example, an absorbing 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, and may also be disposed on the lower surface of the light blocking layer 310.
As yet another example, an 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 absorbing layer may also be disposed on the upper surface of the sensing array 101.
The optical filter may also be disposed on the surface of any structural layer above the sensing array 101, the disposed position of the optical filter is similar to that of the absorption layer, and the specific disposed position may refer to the above description, which is not described herein again.
The fingerprint recognition device shown in fig. 6 includes two light blocking layers, which is just an example, and the fingerprint recognition device may include only one light blocking layer or more than two light blocking layers.
The microlenses 211 shown in fig. 6 may be circular lenses, or the microlenses 211 may be polygonal lenses, such as square lenses or hexagonal lenses.
The microlens array 210 may be used to guide vertical light and also to guide oblique light, which is not particularly limited in the embodiments of the present application.
The optical path guiding structure of the embodiment of the present application may include the microlens array, the dielectric layer, the light blocking layer, the light passing small hole, and the like shown in fig. 6, and of course, the optical path guiding structure may also include other structures, for example, the optical path guiding structure may also include a collimating hole array.
Fig. 7 is a schematic block diagram of an electronic device provided in an embodiment of the present application. The electronic device 700 comprises a display 710 and a fingerprint recognition arrangement 720. The fingerprint recognition device 720 may be disposed below the display screen 710 to perform fingerprint recognition on 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-emitting display screen, such as an OLED screen.
The fingerprint recognition device 720 can be any one of the fingerprint recognition devices described above, and for simplicity, the description thereof is omitted here.
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 to be understood that the terminology used in the embodiments of the present application and the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application.
For example, as used in the examples of this 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 would appreciate that the various illustrative 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 implementation. 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 in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, devices and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
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 ways.
For example, the division of a unit or a module or a component in the above-described device embodiments is only one logical function division, and there may be other divisions in actual implementation, for example, a plurality of 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 executed.
Also for example, the units/modules/components described above as separate/display components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the units/modules/components can be selected according to actual needs to achieve the purposes of the embodiments of the present application.
Finally, it should be noted that the above shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the embodiments 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 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, a light path guide structure and a fingerprint sensor;
the fingerprint sensor comprises an induction array with a plurality of optical induction units, the induction array is used for receiving return light signals which return from a finger above the display screen and pass through the optical filter, the absorption layer and the light path guide structure, and generating a fingerprint image of the finger according to the return light signals;
the optical filter is used for filtering an optical signal of an infrared band in the return optical signal;
the absorption layer is used for absorbing the optical signal in the red waveband in the return optical signal;
the optical path directing structure is to direct the return optical signal to the fingerprint sensor.
2. The fingerprint recognition device of claim 1, wherein the absorption layer is coated on the upper surface and/or the lower surface of the optical filter.
3. The fingerprint recognition device of 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 of any one of claims 1-3, 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 any one of claims 1 to 4, wherein the optical filter is configured to reflect the optical signal in the infrared band with the absorption layer disposed above the optical filter.
6. The fingerprint recognition device according to any one of claims 1 to 4, wherein the optical filter is configured to reflect the optical signal in the infrared band and transmit the optical signal in the red band in a case where the absorption layer is disposed below the optical filter.
7. The fingerprint recognition device according to any one of claims 1-6, 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 of any one of claims 1-7, wherein the absorption layer has an absorption rate of greater than 85% for the red band of light signals.
9. The fingerprint recognition device of any one of claims 1-8, wherein the absorption layer and the optical filter have a transmittance of greater than 80% for both blue and green wavelength bands of light signals.
10. The fingerprint identification device of any one of claims 1-9, wherein the thickness of the absorbing layer is less than 2 μ ι η.
11. The fingerprint recognition device of any one of claims 1-10, wherein the optical filter comprises a single layer or a plurality of layers coated on a substrate.
12. The fingerprint recognition device according to any one of claims 1 to 10, wherein the optical filter comprises a single layer film or a multilayer film coated on any one of the upper surfaces of the optical path guide structure and/or the fingerprint sensor.
13. The fingerprint identification device according to any one of claims 1-12, wherein the material used for the absorbing layer is a polymer film material or a polymer adhesive film material.
14. The fingerprint recognition device according to any one of claims 1 to 13, wherein the absorption layer is applied to any one of the upper surfaces of the optical filter, the optical path guiding structure and/or the fingerprint sensor by dry film bonding or spin-coating baking.
15. An electronic device, comprising:
a display screen;
and a fingerprint recognition device as claimed in any one of claims 1 to 14, said fingerprint recognition device being disposed 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 |
Publications (2)
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| CN111164608A true CN111164608A (en) | 2020-05-15 |
| CN111164608B CN111164608B (en) | 2023-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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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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| Application Number | Title | Priority Date | Filing Date |
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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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| CN (2) | CN111164608B (en) |
| WO (1) | WO2021035622A1 (en) |
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| CN113504666A (en) * | 2021-07-20 | 2021-10-15 | 武汉华星光电技术有限公司 | Display device |
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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 |
| CN112069869A (en) * | 2020-07-13 | 2020-12-11 | 欧菲微电子技术有限公司 | Fingerprint module, manufacturing method thereof, display screen assembly and electronic equipment |
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Also Published As
| Publication number | Publication date |
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| CN111164608B (en) | 2023-09-01 |
| CN210605743U (en) | 2020-05-22 |
| WO2021035622A1 (en) | 2021-03-04 |
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