CN216817443U - Compact optical fingerprint sensor - Google Patents
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- CN216817443U CN216817443U CN202123251416.5U CN202123251416U CN216817443U CN 216817443 U CN216817443 U CN 216817443U CN 202123251416 U CN202123251416 U CN 202123251416U CN 216817443 U CN216817443 U CN 216817443U
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Abstract
The present invention relates to an optical fingerprint sensor comprising: an image sensor comprising an array of photodetector pixels; an optical plate including an object receiving surface for touching during imaging of an object and an image sensor side surface facing an image sensor, the image sensor being configured to acquire an image of the object located on the object receiving surface, the object receiving surface being a rough surface and the image sensor side surface being less rough than the object receiving surface; a light source arranged to emit light into the edge face surface of the optical plate; and a reflective film arranged to cover the at least one edge face surface of the optical plate to prevent light from being transmitted out of the optical plate at the at least one edge face surface.
Description
Technical Field
The present invention relates to an optical fingerprint sensor, and to a device comprising such an optical fingerprint sensor.
Background
Biometric systems are widely used as a means for improving the convenience and security of personal electronic devices such as mobile phones. In particular, fingerprint sensing systems are now included in a large portion of all newly released consumer electronic devices, such as mobile phones.
Optical fingerprint sensors have been around the world, and may be a viable alternative to, for example, capacitive fingerprint sensors in certain applications, such as under-display applications.
Unlike under-display applications, optical fingerprint sensors under cover glass without a display face challenges associated with: providing a compact solution suitable for certain applications while providing sufficient fingerprint image quality.
Accordingly, there is a need for an improved optical fingerprint system disposed under a cover glass without a display.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned and other drawbacks of the prior art, it is an object of the present invention to provide an optical fingerprint sensor that alleviates at least some of the drawbacks of the prior art.
According to a first aspect of the present invention, there is provided an optical fingerprint sensor comprising: an image sensor comprising an array of photodetector pixels; an optical plate including an object receiving surface that an object contacts during imaging of the object and an image sensor side surface facing an image sensor, the image sensor being configured to acquire an image of the object positioned on the object receiving surface, the object receiving surface being a rough surface and the image sensor side surface being less rough than the object receiving surface; a light source arranged to emit light into an edge face surface of the optical plate; and a reflective film arranged to cover the at least one edge facet surface of the optical plate to prevent light from being transmitted out of the optical plate at the at least one edge facet surface.
The utility model is realized based on the following steps: the roughened surface on the optical plate enhances the scattering of light on the object receiving surface, which results in an improved fingerprint image contrast. This is because the rough surface can scatter the light penetrating from the optical plate even when there is no object-contacting surface, whereas the completely flat surface scatters the light when in contact with the object. In this regard, the fingerprint ridges are typically in contact with the optical plate surface and scatter light into the optical plate towards the image sensor at the contact points or contact areas. In contrast, the fingerprint valleys are not in contact with the optical plate, so they will scatter light themselves, and the scattered light will propagate in the air between the optical plate and the valleys before it enters the optical plate, and will thereafter propagate towards the image sensor. With a flat surface, little or no scattering occurs at the surface of the optical plate. In other words, when a finger touches a rough surface, the fingerprint ridge will touch the rough surface and scatter more or less the same amount of light as a flat surface. However, fingerprint valleys having a shape not in contact with the rough surface scatter light at the skin in the valleys first, and scatter light at the rough surface of the optical plate. This results in more scattered light at the fingerprint valleys than at the fingerprint ridges, thus resulting in more light being captured by the image sensor from the fingerprint ridges than from the fingerprint valleys.
Furthermore, the rough surface also reduces the risk of leaving residual latent fingerprints on the object receiving surface.
The utility model is also based on the following realization: the reflective film on the peripheral surface of the optical plate improves the illuminance uniformity of the light for illuminating the finger during fingerprint imaging.
The optical plate is made of a material that allows it to direct light received from the light source by internal reflection along a main plane of the optical plate. Thus, the optical plate may be considered as a light guide or waveguide.
The light source preferably emits visible light, but IR light is conceivable.
The reflective film is adapted to not allow light to transmit through the reflective film. The reflective film is adapted to reflect light incident on the reflective film at least on a surface of the reflective film facing or in contact with the peripheral face surface of the optical plate.
The reflective film is arranged to cover the at least one edge facet surface of the optical plate to prevent light from being transmitted out of the optical plate at the at least one edge facet surface such that internally reflected light from the reflective film is reused to improve illuminance uniformity.
The object receiving surface and the image sensor side surface are parallel surfaces located on opposite sides of the optical plate. The edge face surface has a normal axis which is preferably perpendicular to at least the normal axis of the image sensor side surface and the normal axis of the main plane of the optical plate. The edge face surface faces a lateral direction parallel to the main plane of the optical plate if the object receiving surface and the image sensor side surface are considered to be oriented in an up-down or vertical orientation of the optical plate.
The image sensor may be a Thin Film Transistor (TFT) based image sensor. Such a sensor provides a cost-effective solution for a fingerprint imaging sensor. The TFT image sensor may be a back-illuminated TFT image sensor or a front-illuminated TFT image sensor. Other suitable types of image sensors include CMOS or CCD sensors.
The photodetector pixels are typically configured as individually controllable photodetectors configured to detect an amount of incoming light and generate an electrical signal indicative of the light received by the detector. The operation of the image sensor is considered to be known per se and will not be discussed in detail herein.
According to an embodiment, the reflective film may be arranged to cover all edge face surfaces except the edge face surface arranged to receive light from the light source. In this way, the luminance uniformity is further improved, since the light will be diffused more uniformly in the optical plate.
According to an embodiment, the reflective film may be arranged on all edge facet surfaces of the optical plate except for the entrance part as a sub-part of the edge facet surface where the light source is arranged. Therefore, the reflective film is arranged on all edge faces except for the entrance portion that allows the light emitted by the light source to enter the optical plate. In this way, the illumination uniformity is even further improved.
The reflective film may be provided as a single film or as several segments or portions of reflective film on different portions or on different edge face surfaces.
According to an embodiment, the image sensor side surface is a smooth surface. The smooth surface has a surface roughness less than the rough object receiving surface. The smooth surface may for example be a glass surface or a polymer surface, which is a plane without microstructures. For example, the surface roughness of a smooth surface can be described using the so-called arithmetic mean roughness (usually denoted Ra), and can be less than or equal to 0.1 μm (Ra. ltoreq.0.1 μm). The arithmetic mean roughness is a parameter known per se for defining the roughness of a surface. The arithmetic mean roughness of the object receiving surface is higher than the arithmetic mean roughness of the image side surface.
According to an embodiment, the object receiving surface may comprise a microstructure covering at least one sensing area of the object receiving surface. The sensing area is preferably directly above the image sensor and is preferably large enough to receive a fingerprint. Advantageously, the microstructure provides for scattering of light for illuminating the finger and reduced risk of potential fingerprints being left on the object receiving surface.
Microstructures are structures having a size that can be defined in order or in units of micrometers (μm), for example, 1 to several hundred micrometers.
In some embodiments, the entire object receiving surface may comprise microstructures. Thus, the risk of potential fingerprints being left on the object receiving surface is further reduced.
The microstructures can be provided in a variety of designs and shapes. However, in a preferred embodiment, at least a majority of the microstructures may be hemispherical. In some implementations, the purpose of the selected fabrication method is that all microstructures can be hemispherical structures. In some implementations, all of the microstructures can be hemispherical structures.
Furthermore, at least a majority of the microstructures can have a thickness greater than 0.05 μm-1The radius of curvature of (a). In some implementations, all microstructures can have greater than 0.05 μm-1The radius of curvature of (a).
At least a majority of the microstructures may have a diameter in the range of 5 μm to 20 μm. In some implementations, all of the microstructures can have a diameter in the range of 5 μm to 20 μm.
The pitch of the microstructures may be about 200 μm or less.
The majority may be, for example, greater than 60%, or greater than 70%, or greater than 80%, or preferably greater than 90%.
To reduce the complexity of the sensor and to provide a more compact sensor, the light source is preferably a single light emitting diode.
In some embodiments, the optical fingerprint sensor may comprise an opaque layer portion on the image sensor side of the optical plate. The opaque layer portion may be a black ink layer. The opaque layer portion may absorb direct light from the light source and prevent it from reaching the image sensor.
The opaque layer portion may cover only an area portion of the entrance portion closest to the edge face surface configured to receive light emitted by the light source, the area portion extending a distance from the entrance portion to absorb at least a majority of light rays having an angle of incidence that does not cause the light rays to be internally reflected on the image sensor side surface.
In other words, the opaque layer portion is arranged to prevent light from reaching the image sensor without being internally reflected at least once on the image sensor side surface.
According to a second aspect of the present invention, there is provided an apparatus comprising a security function, the apparatus comprising: the optical fingerprint sensor according to the first aspect; and processing circuitry configured to: receiving, from an optical fingerprint sensor, a signal indicative of a fingerprint of a finger contacting an object receiving surface; and performing a fingerprint authentication process based on information included in the signal; and providing a signal for controlling the security function based on a result of the fingerprint authentication process.
Other effects and features of the second aspect of the utility model are largely analogous to those described above in connection with the first aspect of the utility model.
Other features and advantages of the utility model will be apparent from the following claims, and from the description. Those skilled in the art realize that different features of the present invention can be combined to create embodiments other than those described in the following without departing from the scope of the present invention.
Drawings
These and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing exemplary embodiments of the utility model, wherein:
FIG. 1A conceptually illustrates a side view of an optical fingerprint sensor, in accordance with embodiments of the present invention;
FIG. 1B conceptually illustrates a top view of an optical fingerprint sensor, according to an embodiment of the present invention;
figure 2 conceptually illustrates a top view of an optical fingerprint sensor, according to an embodiment of the present invention;
figure 3 conceptually illustrates an object receiving surface comprising microstructures, according to an embodiment of the present invention;
FIG. 4 conceptually illustrates a side view of an optical fingerprint sensor, according to an embodiment of the present invention; and
fig. 5 is a schematic block diagram of a device including an optical fingerprint sensor according to an embodiment of the present invention.
Detailed Description
In this detailed description, various embodiments of the utility model are described herein with reference to specific implementations. In describing embodiments, specific terminology is employed for the sake of clarity. However, the utility model is not intended to be limited to the specific terminology so selected. While specific exemplary embodiments are discussed, it should be understood that this is done for illustrative purposes only. One skilled in the relevant art will recognize that other components and configurations may be used without departing from the scope of the utility model.
Fig. 1A is a conceptual cross-sectional view of an optical fingerprint sensor 100 according to an embodiment of the utility model, and fig. 1B is a top view of the optical fingerprint sensor 100.
The optical fingerprint sensor 100 comprises an optical plate 102 and an image sensor side 106, the optical plate 102 comprising an object receiving surface 104 for being touched by an object 103 during imaging of the object 103. The object receiving surface 104 is a rough surface. The image sensor side surface 108 of the optical plate 102 has less roughness or is less rough than the object receiving surface 104. Preferably, the image sensor side surface 108 is a smooth surface.
Further, the optical fingerprint sensor 100 comprises an image sensor 110, the image sensor 110 comprising an array of photo detector pixels arranged on the image sensor side 106 to acquire an image of an object located on the opposite object receiving surface 104.
Further, the light source 112 is arranged to emit light into the edge face surface 114 of the optical plate 102. The light source may be a single light emitting diode in order to reduce the complexity of the optical fingerprint sensor 100 and provide a more compact optical fingerprint sensor 100. The light sources are shown spaced apart from the edge face surface 114 to some extent, but may be arranged in contact with the edge face surface 114.
The optical fingerprint sensor 100 comprises a reflective film 116, the reflective film 116 being arranged to cover at least one edge facet surface 118a of the optical plate 102 to prevent light from being transmitted out of the optical plate 102 at the at least one edge facet surface 118 a.
The optical plate 102 is preferably relatively flat with a planar primary extension. The optical plate has a length L1 and a width L2 that define a primary extension of the optical plate. The dimensions L1 and L2 are substantially greater than the thickness w of the optical plate. The thickness w of the optical plate may be in the range 1mm to 10mm, or more preferably in the range 1mm to 5mm, for example 2mm, 3mm or 4 mm. The thickness of the optical plate is substantially uniform. The dimensions L1 and L2 depend on the application at hand, but are preferably large enough to receive a person's fingerprint.
The edge face surface is one of the side faces around the periphery of the optical plate 102, which has a dimension equal to the width w of the optical plate. The edge facet surface is perpendicular to the object-receiving surface and the image sensor side surface 108 facing the image sensor side 106.
The light source 112 is arranged to emit light substantially perpendicularly into the edge facet surface 114 in parallel with the object receiving surface and the surface facing the image sensor side. Light emitted by the light source 112 enters the optical plate through one of the edge face surfaces.
Light rays from the light source 112 that pass through the edge face surface 114 of the optical plate 102 have two main irradiation directions. A rough facing object receiving surface 104 where bi-directional scattering occurs by emitting light toward the object side and reflecting the light inward to remain within optical plate 102, as shown at 109, at the object receiving surface 104. The other illumination direction is toward smooth surface 108 where the high angle of incidence rays are reflected, as shown at 107; while the small incident angle ray 113 is refracted according to snell's law. After the light rays are reflected within the optical plate 102 a plurality of times, some of the light rays will be reflected by the reflective film 116 on the peripheral edge of the optical plate 115102.
When using the optical fingerprint sensor 100, light scattered towards the object side 115 illuminates the object 103, here shown as a finger. The light is reflected from the finger 103, passes through the optical plate 102, and reaches the image sensor 110. The photodetectors of the image sensor convert the received light into electrical signals that are used to reconstruct the fingerprint image.
The image sensor 110 may be arranged on a substrate or a circuit board or similar support 111. The optical plate 102 may be attached to the support 111 via a support post, frame, or other structure such that the image sensor 110 is enclosed.
In addition, the image sensor 110 may include components such as a lens or a collimator and an anti-reflection coating. The image sensor 110 may be attached to the support using, for example, adhesive or other known attachment means.
The reflective film 116 may be made of a metallic reflective film such as aluminum foil and attached to the edge face surface by coating it on the edge face surface or by an adhesive such as glue.
The optical plate 102 may be made of a light-transmissive or transparent material such as glass or polymer.
In fig. 1A, the reflective film 116 is shown covering only one edge face surface 118 a. Preferably, as shown in the top view of the optical fingerprint sensor 100 in FIG. 1B, the reflective film 116 is arranged to cover all of the edge face surfaces 118a-118c except the edge face surface 114 that is arranged to receive light from the light source 112. This advantageously prevents light from escaping from optical plate 102 from all edge face surfaces 118a-118c, making the illumination of object 103 more uniform.
Fig. 2 is a top view of an optical fingerprint sensor 100 according to another embodiment. To further improve illumination uniformity, a reflective film 116 is disposed on all edge facet surfaces 118a-118c, 114 of the optical plate 102, except for an entrance portion 120 that is a sub-portion of the edge facet surface 114 where the light sources 112 are disposed.
The reflective film 116 on the edge facet surfaces 118a-118c, 114 provides further improved illumination uniformity. Light travels from light source 112 through optical plate 102 in a particular distribution. When a preferred single light source 112 is used, rather than a more complex and bulky multi-light source system, a reflective film 116 attached to each of the edge face surfaces 118a-118c, 114 of the optical plate 102 reflects light to provide improved uniformity, despite the use of only a single light source.
Turning again to fig. 1A, the rough surface is conceptually illustrated in close-up view, in which a set of microstructures is shown, one of which is numbered 122. Thus, the roughness of the object receiving surface 104 may be provided by microstructures 122 or microprotrusions covering at least one sensing area 124 (better seen in fig. 1B) of the object receiving surface 104. In some possible implementations, the entire object receiving surface 104 is covered with microstructures 122. The object receiving surface 108 is the entire surface of the optical plate 102 facing the object 103, and the object receiving surface 108 can be touched by the object 103 when the optical fingerprint sensor 100 is used.
The microstructures 122 advantageously provide for reducing the risk of sticking of residual potential fingerprints to the object receiving surface and further improve the scattering of light towards the object 103 touching the object receiving surface 104.
The microstructures may have different diameters. Fig. 1A shows exemplary different diameters a, b, c, d within the microstructure size distribution provided by the manufacturing technique used. Further, fig. 3 conceptually illustrates a close-up top view of a portion of object receiving surface 104 that includes a distribution of microstructures 122. The microstructures 122 are of different shapes and sizes and are randomly distributed on the surface 104.
The microstructures may be fabricated by direct nanoimprint, lithography, etching, roll printing, or some other semiconductor processing method. Alternatively, a separate film having microstructures can be attached to the optical plate 102.
The shape of the microstructures may vary, but preferably at least a majority of the microstructures are hemispherical structures.
The size distribution of the microstructures may have different characteristics. However, the inventors have found that some specific dimensions and characteristics of the microstructure are preferred.
For example, at least a majority of the microstructures have a diameter greater than 0.05 μm-1The radius of curvature of (a). The radius of curvature is referred to herein as the shape of the outer surface 126 of the hemispherical microstructure 122. The microstructures may have different radii of curvature, but are preferably greater than 0.05 μm-1。
Furthermore, at least a majority or all of the microstructures of microstructures 122 have a diameter a, b, c, d in the range of 5 μm to 20 μm.
In addition, the pitch of the microstructures 122 is about 200 μm. In some possible implementations, the pitch of microstructures 122 is less than 200 μm. This spacing is advantageously less than typical fingerprint features, such as the spacing of valleys and ridges, and thus improves the reduction of residual fingerprints on the object touch surface 104.
Figure 4 conceptually illustrates another embodiment of the optical fingerprint sensor 100. The represented elements and components already discussed above are not repeated here. The difference between this embodiment and the embodiment discussed with reference to, for example, fig. 1A to 1B and fig. 2, is that: an opaque layer 130 is disposed on the image sensor side 106 of the optical plate 102. The opaque layer portion may be formed by applying black ink or other type of material directly onto the surface 108 of the optical plate 102 facing the image sensor side 106.
Fig. 5 is a block diagram of an apparatus 200 including a security function 202 and an optical fingerprint sensor 100 according to embodiments described herein. The apparatus 200 also includes processing circuitry, such as a control unit 204, configured to receive signals from the optical fingerprint sensor 100 indicative of a fingerprint of a finger touching the object receiving surface 104. The received signal may include image data. Based on the received signal, the control unit 204 is configured to detect the fingerprint.
The control unit 204 is configured to perform a fingerprint authentication procedure based on information included in the signal received from the optical fingerprint sensor 100 (i.e. based on the detected fingerprint). Such fingerprint authentication processes are considered to be known per se to the skilled person and are not described further herein.
The control unit 204 provides control signals for controlling the security function 202 based on the result of the fingerprint authentication process. For example, if the result is a result of successful authentication, the security function 202 may be opened to provide access to the user, whereas if the result is a result of unsuccessful authentication, the security function 202 may not be opened, thereby preventing access.
The control unit 204 may be a separate control unit of the device 200, e.g. a device controller. Alternatively, the control unit 204 may be included in the optical fingerprint sensor 100.
The device 200 may be, for example, a door lock or a rolling fingerprint scanner. Thus, the security function may be a locking mechanism of the door lock that is electronically controlled according to the result of the fingerprint authentication process.
The control unit may comprise a microprocessor, microcontroller, programmable digital signal processor or another programmable device. The control unit may also or alternatively comprise an application specific integrated circuit, a programmable gate array or programmable array logic, a programmable logic device or a digital signal processor. Where the control unit includes a programmable device (e.g., the microprocessor, microcontroller, or programmable digital signal processor described above), the processor may also include computer executable code that controls the operation of the programmable device. It should be understood that all or some of the functionality provided by means of the control unit (or generally referred to as "processing circuitry") may be at least partially integrated with the optical fingerprint sensor.
Although the present invention has been described with reference to specific exemplary embodiments thereof, many different alterations, modifications and the like will become apparent for those skilled in the art. Also, it should be noted that the components of the imaging device and the method for manufacturing the imaging device may be omitted, interchanged or arranged in various ways while the imaging device is still capable of performing the functions of the present invention.
In addition, variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Claims (15)
1. An optical fingerprint sensor, comprising:
an image sensor comprising an array of photodetector pixels;
an optical plate including an object receiving surface for being touched by an object during imaging of the object and an image sensor side surface facing an image sensor configured to acquire an image of the object located on the object receiving surface,
the object receiving surface is a rough surface and the image sensor side surface is less rough than the object receiving surface;
a light source arranged to emit light into an edge face surface of the optical plate; and
a reflective film arranged to cover at least one edge facet surface of the optical plate to prevent light from being transmitted out of the optical plate at the at least one edge facet surface.
2. The optical fingerprint sensor of claim 1, wherein the reflective film is arranged to cover all edge face surfaces of the optical plate except edge face surfaces arranged to receive light from the light source.
3. The optical fingerprint sensor according to any one of claims 1 and 2, wherein the reflective film is arranged on all edge facet surfaces of the optical plate except for an entrance part being a sub-part of the edge facet surface on which the light source is arranged.
4. The optical fingerprint sensor of any one of claims 1 and 2, wherein the image sensor side surface is a smooth surface.
5. The optical fingerprint sensor of any one of claims 1 and 2, wherein the object receiving surface comprises a microstructure covering at least one sensing area of the object receiving surface.
6. The optical fingerprint sensor of claim 4, wherein the entire object receiving surface comprises microstructures.
7. The optical fingerprint sensor of any one of claims 5 and 6, wherein at least a majority of the microstructures are hemispherical structures.
8. The optical fingerprint sensor of any one of claims 5 and 6, wherein at least a majority of the microstructures have a size greater than 0.05 μ ι η-1The radius of curvature of (a).
9. The optical fingerprint sensor of any one of claims 5 and 6, wherein at least a majority of the microstructures have a diameter in the range of 5 μ ι η to 20 μ ι η.
10. The optical fingerprint sensor of any one of claims 5 and 6, wherein the microstructures have a pitch of about 200 μ ι η or less.
11. The optical fingerprint sensor of any one of claims 5 and 6, wherein the image sensor side surface is free of microstructures.
12. The optical fingerprint sensor of any one of claims 1 and 2, wherein the light source is a single light emitting diode.
13. The optical fingerprint sensor according to any one of claims 1 and 2, comprising an opaque layer portion on the image sensor side surface of the optical plate.
14. The optical fingerprint sensor of claim 13, wherein the opaque layer portion covers only an area portion of the entrance portion closest to an edge face surface configured to receive light emitted by the light source, the area portion extending a distance from the entrance portion to absorb at least a majority of: the light rays have an incident angle that does not cause the light rays to be internally reflected on the side surface of the image sensor.
15. An apparatus including a security function, characterized by comprising:
the optical fingerprint sensor according to any one of claims 1 and 2, and
processing circuitry configured to:
receiving a signal from the optical fingerprint sensor indicative of a fingerprint of a finger touching the object receiving surface, an
Performing a fingerprint authentication procedure based on information comprised in said signal, an
Providing a signal for controlling the security function based on a result of the fingerprint authentication process.
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| CN202123251416.5U CN216817443U (en) | 2021-12-22 | 2021-12-22 | Compact optical fingerprint sensor |
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| CN202123251416.5U CN216817443U (en) | 2021-12-22 | 2021-12-22 | Compact optical fingerprint sensor |
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